阅读说明：本技术 有机污染土壤的处理装置和方法 (Treatment device and method for organic contaminated soil ) 是由 金兆迪 闫荣杰 何茂金 张岩 张哲娜 于 2021-09-28 设计创作，主要内容包括：本公开的实施例提供一种有机污染土壤的处理方法和处理装置,该有机污染土壤的处理方法包括：对有机污染土壤进行热脱附处理,以形成固相物料和烟气；采用蓄热式燃烧炉对所述烟气进行处理并储存热量,且采用所述储存的热量对后续的烟气进行预热处理,采用该有机污染土壤的处理方法可以对有机污染土壤中的挥发性有机物进行无害化处理,可以实现对在燃烧室进行燃烧产生的热量进行回收利用,且采用蓄热式燃烧炉对烟气进行快速降温还可以防止二噁英的形成。(The embodiment of the disclosure provides a processing method and a processing device for organic contaminated soil, wherein the processing method for the organic contaminated soil comprises the following steps: carrying out thermal desorption treatment on the organic polluted soil to form solid-phase materials and smoke; adopt regenerative combustion furnace to handle and store the heat the flue gas, and adopt the heat of storing carries out preheating treatment to subsequent flue gas, adopt this organic contaminated soil's processing method can carry out innocent treatment to the volatile organic compounds in the organic contaminated soil, can realize carrying out recycle to the heat that burns the production in the combustion chamber, and adopt regenerative combustion furnace to carry out rapid cooling to the flue gas can also prevent the formation of dioxin.)

1. A method for treating organic contaminated soil, comprising:

carrying out thermal desorption treatment on the organic polluted soil to form solid-phase materials and smoke;

and treating the flue gas by adopting a regenerative combustion furnace and storing heat, and preheating subsequent flue gas by adopting the stored heat.

2. The method of claim 1, wherein the regenerative furnace comprises a combustion chamber, a first regenerative chamber, and a second regenerative chamber,

the temperature of the first regenerative chamber is higher than that of the second regenerative chamber, and the first regenerative chamber is firstly contacted with the flue gas to preheat the flue gas; the flue gas subjected to the preheating treatment enters the combustion chamber and volatile organic compounds in the flue gas are oxidized and decomposed in the combustion chamber to form purified gas and release heat; the second regenerator absorbs the released heat and discharges the purge gas such that the temperature of the second regenerator is higher than the temperature of the first regenerator.

3. The method of claim 2, wherein the regenerative furnace further comprises a third regenerator from which air is input to the combustion chamber to oxidatively decompose volatile organics in the flue gas.

4. The method of claim 3, wherein the first, second, and third regenerators alternately preheat the flue gas, absorb heat released from the oxidative decomposition of volatile organic compounds in the flue gas to form a purge gas, and deliver air to the combustion chamber.

5. The method according to any one of claims 1 to 4, wherein treating the flue gas with a regenerative burner comprises reducing the temperature of the flue gas to room temperature within 1 minute and decomposing the flue gas.

6. The method of claim 5, further comprising transporting the organic contaminated soil to a thermal desorption unit, wherein subjecting the organic contaminated soil to a thermal desorption process comprises: the natural gas is combusted through a combustor in the thermal desorption unit to form gas with the temperature higher than 200 ℃, and the gas with the temperature higher than 200 ℃ is adopted to directly heat the organic contaminated soil, so that volatile organic compounds in the organic contaminated soil are volatilized and form the smoke.

7. The method according to claim 6, wherein the flue gas and the gas with the temperature higher than 200 ℃ are captured by a first fan, and the thermal desorption unit is kept in a micro-negative pressure condition.

8. The method according to claim 7, wherein the direction of movement of the organically-polluted soil in the thermal desorption unit is the same as the direction of movement of the gas having a temperature above 200 ℃ in the thermal desorption unit.

9. The method of claim 6, wherein prior to treating the flue gas with a regenerative burner, further comprising: and conveying the flue gas to a cyclone dust collector and a filter dust collector in sequence for treatment so as to reduce the content of particulate matters in the flue gas.

10. The method of claim 9, further comprising: and conveying the dust filtered by the cyclone dust collector and the filter dust collector into the thermal desorption unit for secondary treatment.

11. The method according to any one of claims 6 to 10, wherein before the thermal desorption treatment of the organic contaminated soil, the method further comprises screening and demagnetizing the organic contaminated soil.

12. The method of claim 11, wherein the screening and demagnetizing the organically-polluted soil comprises: and screening the organic contaminated soil by using a feeding screening device to obtain screened materials, and removing magnetic substances in the screened materials by using a demagnetizing device.

13. The method of claim 12, further comprising: and conveying the gas-phase substances formed after the flue gas is treated to a deacidification tower for deacidification treatment, conveying the gas-phase substances to a chimney under the action of a second fan, and directly discharging the gas-phase substances from the chimney.

14. The method of claim 13, further comprising transporting the solid phase material to an outfeed system where it passes through an outfeed airlock, an outfeed screw, and a discharge opening before being transported to a storage bin for storage.

15. The method of claim 14, wherein the solid phase material is directly sprayed with the discharge screw to cool the solid phase material.

16. An apparatus for treating organically-polluted soil, comprising: a feeding system and a thermal desorption system which are connected in sequence, and a discharging system and a flue gas treatment system which are connected with the thermal desorption system, wherein,

the thermal desorption system comprises a solid-phase discharge port and a flue gas outlet, the solid-phase discharge port is connected with the discharge system, and the flue gas outlet is connected with the flue gas treatment system;

the flue gas treatment system comprises a regenerative combustion furnace which is configured to treat the flue gas entering from the thermal desorption system and store heat, and the stored heat is used for preheating the subsequently entering flue gas.

17. The process arrangement of claim 16, wherein the regenerative furnace includes a combustion chamber, a first regenerative chamber, a second regenerative chamber, and a third regenerative chamber,

the first regenerator comprises a first flue gas inlet and a first exhaust port;

the second regenerator comprises a second flue gas inlet and a second exhaust port;

the third regenerator comprises a third flue gas inlet and a third exhaust port;

the first, second, and third flue gas inlets are configured to deliver the flue gas to the first, second, and third regenerators, respectively, and any two of the first, second, and third flue gas inlets are not open at the same time;

the first exhaust port, the second exhaust port, and the third exhaust port are respectively configured to discharge purge gas from the first regenerator, the second regenerator, and the third regenerator, and any two of the first exhaust port, the second exhaust port, and the third exhaust port are not opened at the same time.

18. The processing apparatus of claim 16, wherein the feed system comprises a feed hopper, a feed screen, a feed belt, and a degausser in that order,

The feed hopper is configured to apply organically-contaminated soil to the feed belt, the feed screener is configured to screen the organically-contaminated soil prior to applying the organically-contaminated soil to the feed belt, the feed belt is configured to transport the organically-contaminated soil to the thermal desorption system, and the demagnetizer is configured to remove magnetic substances from the organically-contaminated soil.

19. The processing apparatus of claim 16, wherein the thermal desorption system further comprises a feed inlet, a burner and a thermal desorption unit connected in sequence,

the feed inlet is configured to receive the organic contaminated soil conveyed from the feed belt;

the burner is configured to combust natural gas to form a gas having a temperature greater than 200 ℃;

the thermal desorption unit is configured to capture the gas with the temperature higher than 200 ℃, and perform thermal desorption treatment on the organic contaminated soil to form solid-phase materials and smoke;

the solid-phase discharge port is configured to output the solid-phase material formed after the thermal desorption treatment to the discharge system;

the flue gas outlet is configured to output the flue gas formed after the thermal desorption treatment to the flue gas treatment system.

20. The processing device according to claim 16, wherein the discharging system comprises a discharging airlock, a discharging screw, a discharging port and a storage bin which are connected in sequence, and the discharging airlock is connected with the solid phase discharging port.

21. The treatment device according to any one of claims 16 to 20, wherein the flue gas treatment system comprises a cyclone dust collector, a filter dust collector, the regenerative burner, the deacidification tower, the second fan and a chimney which are connected in sequence.

Technical Field

Embodiments of the present disclosure relate to an apparatus and method for treating organic contaminated soil.

Background

Aiming at the organic contaminated soil, the treatment mode adopting the thermal desorption technology has obvious effect, and the thermal desorption technology is widely applied to the remediation of the organic contaminated soil. The thermal desorption technology is also called as thermal desorption technology, is a non-combustion technology, has wide pollutant treatment range and movable treatment equipment, can recycle the repaired soil, particularly can avoid the generation of dioxin in the treatment mode of non-oxidative combustion of chlorine-containing organic matters, and is widely used for repairing organically-polluted soil. At present, the thermal desorption technology is generally divided into two main categories, namely direct thermal desorption and indirect thermal desorption, according to the classification of heating modes. The indirect thermal desorption has the defects of small treatment capacity and high requirement on raw material pretreatment, and compared with the indirect thermal desorption, the indirect thermal desorption has the advantages of high heat exchange efficiency and large treatment capacity, but the gas quantity of pyrolysis desorption gas generated by the direct thermal desorption is large, and the content of particles is high.

For example, when organic contaminated soil is subjected to direct thermal desorption treatment, pyrolysis desorption gas is subjected to pre-dedusting treatment, a cyclone dust collector or a multi-tube dust collector is generally selected, then the pyrolysis desorption gas directly enters a secondary combustion furnace for harmless treatment, and finally, the flue gas can reach the emission standard only through further deep dedusting before being discharged from a chimney.

Disclosure of Invention

The embodiment of the disclosure relates to a treatment device and a treatment method for organic contaminated soil, and the treatment method for organic contaminated soil can be used for performing harmless treatment on volatile organic compounds in the organic contaminated soil, can realize recycling of heat generated by combustion in a combustion chamber, and can prevent dioxin from being formed by rapidly cooling flue gas through a regenerative combustion furnace.

At least one embodiment of the present disclosure provides a method for treating organic contaminated soil, including: carrying out thermal desorption treatment on the organic polluted soil to form solid-phase materials and smoke; and treating the flue gas by adopting a regenerative combustion furnace and storing heat, and preheating subsequent flue gas by adopting the stored heat.

For example, in the method for treating organic contaminated soil according to at least one embodiment of the present disclosure, the regenerative combustion furnace includes a combustion chamber, a first regenerative chamber and a second regenerative chamber, the temperature of the first regenerative chamber is higher than that of the second regenerative chamber, and the first regenerative chamber is first contacted with the flue gas to preheat the flue gas; the flue gas subjected to the preheating treatment enters the combustion chamber and volatile organic compounds in the flue gas are oxidized and decomposed in the combustion chamber to form purified gas and release heat; the second regenerator absorbs the released heat and discharges the purge gas such that the temperature of the second regenerator is higher than the temperature of the first regenerator.

For example, in the method for treating organic contaminated soil according to at least one embodiment of the present disclosure, the regenerative thermal furnace further includes a third regenerative chamber, and air is input from the third regenerative chamber to the combustion chamber to oxidize and decompose the volatile organic compounds in the flue gas.

For example, in the method for treating organically-polluted soil according to at least one embodiment of the present disclosure, the first regenerator, the second regenerator, and the third regenerator alternately preheat the flue gas, absorb heat released when the volatile organic compounds in the flue gas are oxidized and decomposed to form purified gas, and input air to the combustion chamber.

For example, in the method for treating organic contaminated soil according to at least one embodiment of the present disclosure, the step of treating the flue gas with a regenerative combustion furnace includes reducing the temperature of the flue gas to room temperature within 1 minute, and decomposing the flue gas.

For example, at least one embodiment of the present disclosure provides a method for treating organic contaminated soil, further including conveying the organic contaminated soil to a thermal desorption unit, where performing thermal desorption treatment on the organic contaminated soil includes: the natural gas is combusted through a combustor in the thermal desorption unit to form gas with the temperature higher than 200 ℃, and the gas with the temperature higher than 200 ℃ is adopted to directly heat the organic contaminated soil, so that volatile organic compounds in the organic contaminated soil are volatilized and form the smoke.

For example, in the method for treating organic contaminated soil provided by at least one embodiment of the present disclosure, a first fan is used to capture the flue gas and the gas with the temperature higher than 200 ℃, and the thermal desorption unit is kept in a micro-negative pressure condition.

For example, in the method for treating organic contaminated soil provided by at least one embodiment of the present disclosure, the movement direction of the organic contaminated soil in the thermal desorption unit is the same as the movement direction of the gas with the temperature higher than 200 ℃.

For example, in the method for treating organic contaminated soil provided by at least one embodiment of the present disclosure, before the flue gas is treated by using a regenerative combustion furnace, the method further includes: and conveying the flue gas to a cyclone dust collector and a filter dust collector in sequence for treatment so as to reduce the content of particulate matters in the flue gas.

For example, at least one embodiment of the present disclosure provides a method for treating organic contaminated soil, further including: and conveying the dust filtered by the cyclone dust collector and the filter dust collector into the thermal desorption unit for secondary treatment.

For example, in the method for treating organic contaminated soil provided by at least one embodiment of the present disclosure, before the thermal desorption treatment is performed on the organic contaminated soil, a screening treatment and a demagnetizing treatment are further performed on the organic contaminated soil.

For example, in a method for treating organic contaminated soil provided in at least one embodiment of the present disclosure, the performing the sieving treatment and the demagnetizing treatment on the organic contaminated soil includes: and screening the organic contaminated soil by using a feeding screening device to obtain screened materials, and removing magnetic substances in the screened materials by using a demagnetizing device.

For example, at least one embodiment of the present disclosure provides a method for treating organic contaminated soil, further including: and conveying the gas-phase substances formed after the flue gas is treated to a deacidification tower for deacidification treatment, conveying the gas-phase substances to a chimney under the action of a second fan, and directly discharging the gas-phase substances from the chimney.

For example, at least one embodiment of the present disclosure provides a method for treating organically-polluted soil, further comprising conveying the solid-phase material to an outfeed system, wherein the solid-phase material is conveyed to a storage bin for storage after passing through an outfeed airlock, an outfeed screw, and a discharge opening.

For example, in the method for treating organic contaminated soil provided by at least one embodiment of the present disclosure, the solid-phase material is directly sprayed by using the discharge screw to cool the solid-phase material.

At least one embodiment of the present disclosure further provides a processing apparatus of organic contaminated soil, including: the device comprises a feeding system, a thermal desorption system, a discharging system and a flue gas treatment system, wherein the feeding system and the thermal desorption system are sequentially connected with each other, the discharging system and the flue gas treatment system are connected with the thermal desorption system, the thermal desorption system comprises a solid-phase discharging port and a flue gas outlet, the solid-phase discharging port is connected with the discharging system, and the flue gas outlet is connected with the flue gas treatment system; the flue gas treatment system comprises a regenerative combustion furnace which is configured to treat the flue gas entering from the thermal desorption system and store heat, and the stored heat is used for preheating the subsequently entering flue gas.

For example, in a processing apparatus provided in at least one embodiment of the present disclosure, the regenerative furnace includes a combustion chamber, a first regenerative chamber, a second regenerative chamber, and a third regenerative chamber, the first regenerative chamber including a first flue gas inlet and a first exhaust port; the second regenerator comprises a second flue gas inlet and a second exhaust port; the third regenerator comprises a third flue gas inlet and a third exhaust port; the first, second, and third flue gas inlets are configured to deliver the flue gas to the first, second, and third regenerators, respectively, and any two of the first, second, and third flue gas inlets are not open at the same time; the first exhaust port, the second exhaust port, and the third exhaust port are respectively configured to discharge purge gas from the first regenerator, the second regenerator, and the third regenerator, and any two of the first exhaust port, the second exhaust port, and the third exhaust port are not opened at the same time.

For example, in the processing apparatus provided in at least one embodiment of the present disclosure, the feeding system includes a feeding hopper, a feeding sifter, a feeding belt and a demagnetizer, which are sequentially disposed, the feeding hopper is configured to apply the organic contaminated soil to the feeding belt, the feeding sifter is configured to perform a sifting process on the organic contaminated soil before the organic contaminated soil is applied to the feeding belt, the feeding belt is configured to convey the organic contaminated soil to the thermal desorption system, and the demagnetizer is configured to remove magnetic substances in the organic contaminated soil.

For example, in the processing apparatus provided in at least one embodiment of the present disclosure, the thermal desorption system further includes a feed inlet, a burner and a thermal desorption unit connected in sequence, wherein the feed inlet is configured to receive the organic contaminated soil conveyed from the feed belt; the burner is configured to combust natural gas to form a gas having a temperature greater than 200 ℃; the thermal desorption unit is configured to capture the gas with the temperature higher than 200 ℃, and perform thermal desorption treatment on the organic contaminated soil to form solid-phase materials and smoke; the solid-phase discharge port is configured to output the solid-phase material formed after the thermal desorption treatment to the discharge system; the flue gas outlet is configured to output the flue gas formed after the thermal desorption treatment to the flue gas treatment system.

For example, in the processing apparatus provided by at least one embodiment of the present disclosure, the discharge system includes a discharge airlock, a discharge screw, a discharge opening, and a storage bin, which are connected in sequence, and the discharge airlock is connected with the solid phase discharge opening.

For example, in the processing apparatus provided in at least one embodiment of the present disclosure, the flue gas processing system includes a cyclone dust collector, a filter dust collector, the regenerative burner, the deacidification tower, the second fan, and a chimney, which are connected in sequence.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and it is apparent that the drawings in the following description only relate to some embodiments of the present invention and are not limiting on the present invention.

Fig. 1 is a flowchart illustrating a method for treating an organic contaminated soil according to an embodiment of the present disclosure;

FIG. 2 is a flow chart of another method for treating organic contaminated soil according to an embodiment of the present disclosure;

fig. 3 is a schematic cross-sectional view of a regenerative burner according to an embodiment of the present disclosure;

FIG. 4 is a flow chart of another method for treating organic contaminated soil according to an embodiment of the present disclosure; and

Fig. 5 is a schematic view of a processing apparatus for organic contaminated soil according to an embodiment of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "top", "bottom", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

At present, the direct heating type thermal desorption device generally has an oxidation chamber, namely a second combustion chamber, and the direct heating type thermal desorption device with the second combustion chamber has serious heat loss in the operation process and does not fully utilize the heat, thereby leading the maximum resource utilization not to be carried out. In addition, the improper treatment of present direct heating formula thermal desorption device to high temperature flue gas and tail gas causes the generation of toxic compounds such as dioxin easily, but also can lead to the dioxin along with tail gas direct from the chimney discharge to the atmosphere to cause environmental pollution. Therefore, it is urgent to develop a direct heating type thermal desorption apparatus capable of recycling heat and preventing dioxin from being generated during the operation thereof, and a direct heating type thermal desorption method for recycling heat and preventing dioxin from being generated.

The inventor of the present disclosure has noticed that a regenerative combustion furnace may be used to oxidize and decompose volatile organic compounds in the mixed flue gas generated during thermal desorption into carbon dioxide and water, and the ceramic heat accumulator included in the regenerative combustion furnace stores heat, and the heat stored in the ceramic heat accumulator is used to preheat the mixed flue gas entering subsequently, so as to save fuel consumption during the heating process of the flue gas. The ceramic heat accumulator included in the regenerative combustion furnace can also quickly cool the generated high-temperature flue gas so as to prevent the generation of dioxin.

At least one embodiment of the present disclosure provides a method for treating organic contaminated soil, including: carrying out thermal desorption treatment on the organic polluted soil to form solid-phase materials and smoke; the heat accumulating type combustion furnace is adopted to process the flue gas and store heat, and the stored heat is adopted to preheat the subsequent flue gas, so that the method for treating the organic polluted soil can realize harmless treatment on volatile organic compounds in the mixed flue gas, and can save fuel consumption in the flue gas heating process. The ceramic heat accumulator included in the regenerative combustion furnace can quickly cool the generated high-temperature flue gas, so that the generation of dioxin can be prevented.

For example, fig. 1 is a flowchart of a method for treating organic contaminated soil according to an embodiment of the present disclosure, and as shown in fig. 1, the method includes the following steps.

S01: carrying out thermal desorption treatment on the organic contaminated soil to form solid-phase materials and smoke.

For example, the organic contaminated soil is transferred to a thermal desorption system including a feed port through which the organic contaminated soil transferred from the thermal desorption unit is received, a burner, and a thermal desorption unit, which are connected in this order. The combustor is adopted to combust natural gas to form gas with the temperature higher than 200 ℃ so as to prepare for directly heating the organic contaminated soil subsequently, and then the formed flue gas is conveyed to the thermal desorption unit.

For example, the thermal desorption system comprises a thermal desorption unit for capturing gas with a temperature higher than 200 ℃, and directly heating the organic contaminated soil by using the gas with the temperature higher than 200 ℃ so as to volatilize volatile organic compounds in the organic contaminated soil and form flue gas, and separating solid-phase materials from the flue gas. For example, the direction of movement of the organically-polluted soil in the thermal desorption unit is the same as the direction of movement of the gas having a temperature higher than 200 ℃ in the thermal desorption unit. When the motion direction of the organic contaminated soil in the thermal desorption unit is the same as the motion direction of the gas with the temperature higher than 200 ℃ in the thermal desorption unit, the temperature of the flue gas can be ensured, organic components in the flue gas are prevented from being condensed and attached to solid particles after the flue gas output from the thermal desorption unit enters the cyclone dust collector, and therefore the treatment of the particles captured by the cyclone dust collector is prevented from failing to reach the standard.

For example, in one example, the first fan may be used to capture the flue gas and the gas with the temperature higher than 200 ℃, and maintain the thermal desorption unit at a slightly negative pressure, so as to prevent the flue gas in the thermal desorption system from escaping into the air.

For example, the thermal desorption system further comprises a solid-phase discharge port and a flue gas outlet, and the solid-phase discharge port can output the solid-phase material formed after thermal desorption treatment to the discharge system; this exhanst gas outlet can export the flue gas that forms after thermal desorption handles to flue gas processing system to carry out innocent treatment to the flue gas in this flue gas processing system.

S02: the regenerative combustion furnace is adopted to process the flue gas and store heat, and the stored heat is adopted to preheat the subsequent flue gas.

For example, the flue gas treatment system comprises a regenerative combustion furnace, the regenerative combustion furnace comprises a combustion chamber, a first regenerative chamber and a second regenerative chamber, the flue gas entering from the thermal desorption system can be subjected to secondary combustion in the combustion chamber, the heat generated by the secondary combustion is stored by adopting the first regenerative chamber or the second regenerative chamber, and then the stored heat is adopted to carry out preheating treatment on the subsequent entering flue gas, so that the step of heating the natural gas generated by burning in the combustor relative to the flue gas is reduced.

For example, the temperature of the first regenerator is higher than that of the second regenerator, the first regenerator is first contacted with the flue gas to preheat the flue gas, the preheated flue gas enters the combustion chamber and oxidatively decomposes the volatile organic compounds in the flue gas in the combustion chamber to form a purified gas and release heat, and the second regenerator absorbs the released heat and discharges the purified gas so that the temperature of the second regenerator is higher than that of the first regenerator.

For example, fig. 2 is a flowchart of another method for treating organic contaminated soil according to an embodiment of the present disclosure, and as shown in fig. 2, the method includes the following steps.

S11: and (4) carrying out screening treatment and demagnetizing treatment on the organic contaminated soil.

For example, the screening treatment and the demagnetizing treatment of the organic contaminated soil include: screening the organic contaminated soil by using a feeding screening device to obtain a screened material, and removing magnetic substances in the screened material by using a demagnetizing device.

For example, the organic contaminated soil may be input through a feed hopper, and then the organic contaminated soil is subjected to a screening process by using a feed screening device to remove the large-sized organic contaminated soil, and then the organic contaminated soil with a suitable particle size is conveyed to a direct heating type thermal desorption system, so as to prevent a pipeline into which the subsequent organic contaminated soil needs to enter from being blocked, thereby reducing the treatment efficiency of the organic contaminated soil.

For example, the size of the large-size organic contaminated soil is larger than or equal to the minimum pipe diameter of a pipeline into which subsequent organic contaminated soil needs to enter. The size of the large-size organic contaminated soil which can be screened and determined by the feeding screening device is also changed according to the difference of the minimum pipe diameter of a pipeline which needs to be entered by the subsequent organic contaminated soil.

For example, the organic contaminated soil after being screened by the feeding screen is conveyed to a feeding belt, the organic contaminated soil is conveyed to a thermal desorption system by the feeding belt, and in the process of conveying the organic contaminated soil by the feeding belt, a magnetic substance contained in the organic contaminated soil is removed by a magnetic separator, wherein the magnetic substance comprises a magnetic substance formed by iron element, nickel element or cobalt element, such as iron filings, iron wires, nickel filings, cobalt filings, ferroferric oxide and the like.

S12: carrying out thermal desorption treatment on the organic polluted soil subjected to screening treatment and demagnetizing treatment to form solid-phase materials and smoke.

For example, the thermal desorption treatment of the organic contaminated soil after the sieving treatment and the demagnetizing treatment can be referred to the above description of step S01 in fig. 1, and will not be described herein again.

S13: the regenerative combustion furnace is adopted to process the flue gas and store heat, and the stored heat is adopted to preheat the subsequent flue gas.

For example, when the regenerative combustion furnace included in the flue gas treatment system includes a combustion chamber, a first regenerative chamber and a second regenerative chamber, the regenerative combustion furnace is used to treat the flue gas and store heat, and the specific process of using the stored heat to perform the preheating treatment on the subsequent flue gas may be referred to the above description of step S02 in fig. 1, and will not be described herein again.

For example, in one example, the regenerative furnace further includes a third regenerator from which air is input to the combustion chamber to cause oxidative decomposition of volatile organic compounds in the flue gas to complete the first cycle.

For example, the packing in the first regenerator, the second regenerator and the third regenerator in the regenerative furnace comprises at least one of ceramic honeycomb packing and ceramic saddle ring packing, and the regenerative furnace has an efficiency of decomposing volatile organic compounds of more than 99% and an efficiency of recovering heat of more than 95%.

For example, the first regenerator, the second regenerator, and the third regenerator alternately preheat the flue gas, absorb heat released when the volatile organic compounds in the flue gas are oxidized and decomposed to form purified gas, and input air to the combustion chamber.

For example, in the second cycle, the second regenerator is first contacted with the flue gas to preheat the flue gas, air is input into the combustion chamber from the first regenerator to oxidize and decompose the volatile organic compounds in the flue gas, the preheated flue gas enters the combustion chamber and oxidizes and decomposes the volatile organic compounds in the flue gas in the combustion chamber to form purified gas and release heat, the third regenerator absorbs the released heat so that the temperature of the third regenerator is higher than that of the second regenerator, and purified gas formed after the volatile organic compounds in the flue gas are oxidized and decomposed is cooled and then discharged from the third regenerator to complete the second cycle.

For example, in the third cycle, the third regenerator contacts the flue gas first to preheat the flue gas, air is input into the combustion chamber from the second regenerator to oxidize and decompose the volatile organic compounds in the flue gas, the preheated flue gas enters the combustion chamber and oxidizes and decomposes the volatile organic compounds in the flue gas in the combustion chamber to form purified gas and release heat, the first regenerator absorbs the released heat so that the temperature of the first regenerator is higher than that of the third regenerator, and purified gas formed after the volatile organic compounds in the flue gas are oxidized and decomposed is cooled and then is discharged from the first regenerator to complete the third cycle.

For example, in one example, the treatment of the flue gas by using the regenerative combustion furnace includes reducing the temperature of the flue gas to room temperature within 1 minute, that is, rapidly cooling the flue gas by using the regenerative combustion furnace, and performing oxidative decomposition on the volatile organic compounds in the flue gas to form carbon dioxide and water, so as to reduce the subsequent treatment steps of the part of the volatile organic compounds, and reduce the treatment amount of the subsequent deacidification treatment. In addition, the regenerative combustion furnace is adopted to rapidly cool the flue gas, and the formation of dioxin can be prevented.

For example, in one example, the operation principle of the regenerative combustion furnace is described by taking the regenerative combustion furnace as an example that the regenerative combustion furnace includes two regenerators, air is firstly delivered to the regenerative combustion furnace when the regenerative combustion furnace is started, and the regenerators are heated to a certain temperature by means of heat generated by combustion of volatile organic compounds in flue gas. Since the regenerator has an extremely high heat storage performance, it takes a certain time to heat from a cold regenerator to a regenerator having a certain high temperature and also to achieve a normal temperature distribution. During normal operation, one of the regenerators has stored heat in the previous operation cycle, the newly-entered flue gas to be processed firstly enters the first regenerator storing heat from the bottom, the flue gas is preheated to a temperature close to the combustion temperature through the bed layer of the first regenerator, the regenerators are simultaneously and gradually cooled, and air also enters from other pipelines of the first regenerator to provide oxygen for the subsequent oxidation of volatile organic compounds. The preheated flue gas enters the top combustion chamber, volatile organic compounds in the flue gas are oxidized and decomposed into carbon dioxide and water in the combustion chamber, namely, the volatile organic compounds are used as high-temperature purified gas to enter another heat storage chamber, namely, the second heat storage chamber, at the moment, the heat of the purified gas is transferred to the second heat storage chamber, the bed layer of the second heat storage chamber is gradually heated, and the purified gas is cooled and then discharged from the second heat storage chamber. When the cooled first regenerator cools to an allowable temperature level, the direction of the gas flow is switched, i.e., the first cycle is completed.

For example, after the direction of the air flow is switched, the flue gas enters the heated second regenerator to be preheated, and air also enters from other pipes of the second regenerator to provide oxygen for the subsequent oxidation of the volatile organic compounds, then the preheated flue gas enters the combustion chamber at the top, the volatile organic compounds in the flue gas in the combustion chamber are oxidized and decomposed into carbon dioxide and water, namely, the carbon dioxide and the water are used as high-temperature purified gas, heat is transferred to the first regenerator cooled in the previous cycle, and the purified gas is discharged from the first regenerator after being cooled, and as described above, the second cycle is completed to realize the continuous treatment of the flue gas.

For example, fig. 3 is a schematic cross-sectional structure view of a regenerative combustion furnace according to an embodiment of the present disclosure, and as shown in fig. 3, a ceramic regenerator 4031 in the regenerative combustion furnace 403 includes three regenerators, namely a first regenerator 4031a, a second regenerator 4031b and a third regenerator 4031c, and output terminals of the first regenerator 4031a, the second regenerator 4031b and the third regenerator 4031c are respectively controlled by a switch.

For example, the operation of the ceramic regenerator 403 in fig. 3 is illustrated as including three regenerators, and as shown in fig. 3, the ceramic regenerator 4031 of the regenerative furnace 403 includes three regenerators that operate simultaneously: when the first regenerator 4031a having a certain temperature is in a stage of being cooled and the flue gas is being preheated (cold cycle), the second regenerator 4031b is in a process of being heated by the purge gas (hot cycle), and discharges the purge gas after being heated, the purified gas is carbon dioxide and water generated by the oxidative decomposition of volatile organic compounds in the flue gas in the combustion chamber, and the third regenerator 4031c is delivering air to the combustion chamber to provide oxygen for subsequent oxidation of volatile organics, and therefore, after one cycle, the newly introduced flue gas always enters the regenerator (second regenerator 4031b) that discharged the purge gas during the previous cycle, while the regenerator (first regenerator 4031a) that originally entered the flue gas is used to transport air, the third regenerator 4031c is in the process of being heated by the purge gas (hot cycle) and discharges the purge gas after being heated.

For example, fig. 4 is a flowchart of another method for treating organic contaminated soil according to an embodiment of the present disclosure, and as shown in fig. 4, the method for treating organic contaminated soil includes the following steps.

S21: and (4) carrying out screening treatment and demagnetizing treatment on the organic contaminated soil.

For example, the screening process and the demagnetization process can be referred to the above description of step S11 in fig. 2, and will not be described herein again.

S22: carrying out thermal desorption treatment on the organic polluted soil subjected to screening treatment and demagnetizing treatment to form solid-phase materials and smoke.

For example, the thermal desorption treatment of the organic contaminated soil after the sieving treatment and the demagnetizing treatment can be referred to the above description of step S12 in fig. 2, and will not be described again.

S23: the solid-phase materials are conveyed to a discharging system, and conveyed to a storage bin for storage after passing through a discharging airlock, a discharging screw and a discharging opening in the discharging system.

For example, can adopt ejection of compact spiral to directly spray solid phase material in order to cool down solid phase material to make solid phase material rapid cooling, so that carry to the storage silo fast, so that should carry out the process of handling to organic contaminated soil and go on in succession, thereby improved the efficiency of handling organic contaminated soil.

S24: and the flue gas is sequentially conveyed to a cyclone dust collector and a filter dust collector for treatment so as to reduce the content of particulate matters in the flue gas.

For example, after being output from the flue gas outlet, the flue gas sequentially enters the cyclone dust collector and the filter dust collector for dust removal, so that the content of particulate matters in the flue gas is reduced, and the risk that the pipeline and the regenerative combustion furnace are blocked by the particulate matters is reduced.

S25: and conveying the dust filtered by the cyclone dust collector and the filter dust collector into a thermal desorption unit for secondary treatment.

For example, the dust is conveyed into the thermal desorption unit for secondary treatment, so that the solid-phase material in the dust is conveyed to the discharging system, and conveyed to the storage bin for storage after passing through the discharging airlock, the discharging screw and the discharging opening in the discharging system.

S26: the regenerative combustion furnace is adopted to process the flue gas and store heat, and the stored heat is adopted to preheat the subsequent flue gas.

For example, the flue gas is processed by a regenerative combustion furnace and heat is stored, and the specific process of using the stored heat to perform a preheating treatment on the subsequent flue gas can be referred to the above description of step S13 in fig. 2, and will not be described herein again.

S27: and conveying the gas-phase substances formed after the flue gas is treated to a deacidification tower for deacidification treatment.

For example, the gas phase formed after the flue gas is treated comprises corrosive gases such as sulfur dioxide, hydrogen sulfide, hydrogen chloride and the like, and the gas phase substances are conveyed to the deacidification tower to be subjected to deacidification treatment, and then can enter the next purification process, so that the risk of pipeline corrosion is reduced. Meanwhile, gas reaching the emission standard can be formed, so that the gas reaching the emission standard can be directly discharged.

S28: and conveying the gas-phase substances to the chimney under the action of the second fan, and directly discharging the gas-phase substances from the chimney.

For example, the second fan may capture the gas phase species and then deliver the gas phase species to a stack for discharge to the atmosphere.

At least one embodiment of the present disclosure further provides a processing apparatus of organic contaminated soil, including: the device comprises a feeding system, a thermal desorption system, a discharging system and a flue gas treatment system, wherein the feeding system and the thermal desorption system are sequentially connected with each other, the discharging system and the flue gas treatment system are connected with the thermal desorption system, the thermal desorption system comprises a solid-phase discharging port and a flue gas outlet, the solid-phase discharging port is connected with the discharging system, and the flue gas outlet is connected with the flue gas treatment system; the flue gas treatment system comprises a regenerative combustion furnace which is configured to treat the flue gas entering from the thermal desorption system and store heat, and the stored heat is used for preheating the subsequently entering flue gas.

For example, fig. 5 is a schematic view of a processing apparatus for organic contaminated soil according to an embodiment of the present disclosure, and as shown in fig. 5, the processing apparatus for organic contaminated soil includes: the system comprises a feeding system 10, a thermal desorption system 20, a discharging system 30 and a flue gas treatment system 40, wherein the feeding system 10 and the thermal desorption system 20 are connected in sequence, the discharging system 30 and the flue gas treatment system 40 are connected with the thermal desorption system 20, the thermal desorption system 20 comprises a solid-phase discharging port 204 and a flue gas outlet 205, the solid-phase discharging port 204 is connected with the discharging system 30, and the flue gas outlet 205 is connected with the flue gas treatment system 40; the flue gas treatment system 40 comprises a regenerative burner 403, and the regenerative burner 403 is configured to treat the flue gas entering from the thermal desorption system 20 and store heat, and preheat the flue gas entering subsequently with the stored heat, so as to reduce the process of preheating the flue gas entering subsequently.

For example, as shown in fig. 5, the feeding system 10 includes a feeding hopper 101, a feeding sieve 102, a feeding belt 103 and a demagnetizer 104, which are sequentially arranged, the feeding hopper 101 is configured to apply the organic contaminated soil to the feeding belt 103, the feeding sieve 102 is configured to sieve the organic contaminated soil before applying the organic contaminated soil to the feeding belt 103, the feeding belt 103 is configured to convey the organic contaminated soil to the thermal desorption system 20, and the demagnetizer 104 is configured to remove magnetic substances in the organic contaminated soil.

For example, the operation of the feeding system 10 is as follows: the organic contaminated soil is input by the feed hopper 101, and then is screened by the feed screening device 102, so that the large-size organic contaminated soil is removed, and the problem that the treatment efficiency of the organic contaminated soil is reduced due to blockage of a pipeline into which the subsequent organic contaminated soil needs to enter is solved. The organic contaminated soil after being screened and processed by the feeding screening device 102 is conveyed to the feeding belt 103, the organic contaminated soil is conveyed to the thermal desorption system 20 by the feeding belt 103, and in the process of conveying the organic contaminated soil by the feeding belt 103, the magnetic material contained in the organic contaminated soil is removed by the magnetism removing device 104, so that the magnetic material is prevented from being adsorbed on the pipe wall of a pipeline into which the subsequent organic contaminated soil needs to enter, and the pipe diameter of the circulation of the organic contaminated soil is reduced. For example, the magnetic substance includes a substance having magnetism formed of an iron element, a nickel element, or a cobalt element, such as iron pieces, iron wires, nickel pieces, cobalt pieces, ferroferric oxide, and the like.

For example, the size of the large-size organic contaminated soil is larger than or equal to the minimum pipe diameter of a pipeline into which subsequent organic contaminated soil needs to enter. The size of the sized organic contaminated soil that can be screened by the feed screen 102 will vary depending on the minimum pipe diameter of the pipe into which the subsequent organic contaminated soil will be introduced.

For example, as shown in fig. 5, the thermal desorption system 20 comprises a feed port 201, a burner 202 and a thermal desorption unit 203 which are connected in sequence, in addition to the solid phase discharge port 204 and the flue gas outlet 205 mentioned above. For example, the feeding port 201 is configured to receive the organic contaminated soil conveyed from the feeding belt 103. The burner 202 is configured to burn natural gas to form a gas having a temperature greater than 200 ℃. The thermal desorption unit 203 is configured to capture gas with a temperature higher than 200 ℃, and perform thermal desorption treatment on the organic contaminated soil to form solid phase material and flue gas. The solid phase discharge port 204 is configured to output the solid phase material formed after the thermal desorption treatment to the discharge system 30. The flue gas outlet 205 is configured to output flue gas formed after the thermal desorption process to the flue gas treatment system 40.

For example, the operation of the thermal desorption system 20 is as follows: the organic contaminated soil conveyed from the feeding belt 103 is received through the feeding hole 201, then the burner 202 is adopted to burn natural gas to form gas with the temperature higher than 200 ℃, the gas with the temperature higher than 200 ℃ can be subsequently adopted to directly heat the entered organic contaminated soil, so that preparation is made for the subsequent direct heating and thermal desorption of the organic contaminated soil, then the gas with the temperature higher than 200 ℃ is conveyed to the thermal desorption unit 203, namely the feeding belt 103 can convey the organic contaminated soil which is subjected to screening treatment and magnetic removal treatment to the thermal desorption unit 203, the thermal desorption unit 203 captures the gas with the temperature higher than 200 ℃, and the gas with the temperature higher than 200 ℃ is adopted to directly heat the organic contaminated soil, so that volatile organic matters in the organic contaminated soil volatilize and form smoke, and solid-phase materials and the smoke are separated, finally, solid-phase materials formed after thermal desorption treatment are output to the discharging system 30 through the solid-phase discharging hole 204, and flue gas formed after thermal desorption treatment is output to the flue gas treatment system 40 through the flue gas outlet 205, so that the flue gas is subjected to harmless treatment in the flue gas treatment system 40.

For example, the movement direction of the organic contaminated soil in the thermal desorption unit 203 is the same as the movement direction of the gas with the temperature higher than 200 ℃ in the thermal desorption unit 203, and when the movement direction of the organic contaminated soil in the thermal desorption unit 203 is opposite to the movement direction of the gas with the temperature higher than 200 ℃ in the thermal desorption unit 203, the temperature of the flue gas can be ensured, so that organic components in the flue gas are prevented from being condensed and attached to solid particles after the flue gas output from the thermal desorption unit 203 enters the cyclone 401, and the treatment of the particles captured by the cyclone 401 is not up to standard.

For example, the first fan disposed in the thermal desorption system 20 may be further used to capture the formed flue gas and the gas with the temperature higher than 200 ℃, and the thermal desorption unit 203 is kept in a micro-negative pressure condition, so as to prevent the flue gas in the thermal desorption system 20 from escaping into the air, that is, to avoid the pollution of the flue gas to the environment.

For example, as shown in fig. 5, the discharging system 30 includes a discharging airlock 301, a discharging screw 302, a discharging port 303 and a storage bin 304 connected in sequence, and the discharging airlock 301 is connected with the solid phase discharging port 204 of the thermal desorption system 20.

For example, the operation of the discharging system 30 is as follows: make solid phase material input to discharge system 30 after opening ejection of compact airlock 301, adopt ejection of compact spiral 302 to directly spray solid phase material in order to cool down solid phase material, thereby make solid phase material rapid cooling, so that carry fast to discharge opening 303, then carry solid phase material from discharge opening 303 to storage silo 304 and store, so that this process of handling organic contaminated soil goes on in succession, thereby improved the efficiency of handling organic contaminated soil.

For example, as shown in fig. 5, the flue gas treatment system 40 includes a cyclone 401, a filter dust collector 402, a regenerative burner 403, a deacidification tower 404, a second fan 405 and a chimney 406, which are connected in sequence, the cyclone 401 is connected with the flue gas outlet 205, and the flue gas treatment system 40 can perform harmless treatment on the flue gas.

As shown in fig. 5, the regenerative furnace 403 includes a combustion chamber 4032, a first regenerator 4031a, and second and third regenerators 4031b and 4031c, the first regenerator 4031a including a first flue gas inlet 4031a1 and a first exhaust port 4031a 2; the second regenerator 4031b includes a second flue gas inlet 4031b1 and a second exhaust port 4031b 2; the third thermal chamber 4031c includes a third flue gas inlet 4031c1 and a third exhaust port 4031c 2. The first, second, and third flue gas inlets 4031a1, 4031b1, 4031c1, respectively, are configured to deliver flue gas to the first, second, and third regenerators 4031a, 4031b, 4031c, respectively, and any two of the first, second, and third flue gas inlets 4031a1, 4031b1, 4031c1 are not simultaneously open. The first, second, and third exhaust ports are configured to exhaust purge gas from the first, second, and third regenerators 4031a, 4031b, 4031c, respectively, and any two of the first, second, and third exhaust ports 4031a2, 4031b2, 4031c2 are not open at the same time.

It is noted that, although not shown in fig. 5, the first, second, and third regenerators 4031a, 4031b, 4031c each include separate conduits for delivering air to the combustion chambers.

For example, the packing in the regenerator 4031 of the regenerative furnace 403 may include at least one of ceramic honeycomb packing and ceramic saddle ring packing, and the regenerative furnace 403 may have an efficiency of 99% or more for decomposition of volatile organic compounds and 95% or more for heat recovery.

For example, the operation of the flue gas treatment system 40 is as follows: after being output from the flue gas outlet 205, the flue gas sequentially enters the cyclone dust collector 401 and the filter dust collector 402 for dust removal, so that the content of particulate matters in the flue gas is reduced, and the risk that the particulate matters block pipelines and the regenerative combustion furnace 403 is reduced. The dedusted flue gas is delivered to a regenerative combustion furnace 403, which is illustrated by taking the regenerative combustion furnace 403 shown in fig. 2 as an example, the flue gas firstly enters a first regenerator 4031a, the first regenerator 4031a with a certain temperature is in a stage of being cooled and the flue gas is in a stage of being preheated (cold cycle), at this time, a second regenerator 4031b is in a process of being heated by purified gas (hot cycle), the purified gas is carbon dioxide and water generated by oxidative decomposition of volatile organic compounds in the flue gas in the combustion chamber, a third regenerator 4031c delivers air to the combustion chamber 4032 to provide oxygen for the subsequent oxidation of the volatile organic compounds, after the cycle is completed, the treated flue gas enters an deacidification tower 404 to perform deacidification treatment so as to reduce the risk of corrosion of a pipeline, and then the gas-phase substances after the deacidification treatment are captured by using a second fan 405, the gas phase species is then transported to a stack 406 for discharge to the atmosphere.

For example, in one example, the treatment of the flue gas using the regenerative burner 403 includes reducing the temperature of the flue gas to room temperature within 1 minute, and performing oxidative decomposition on the volatile organic compounds in the flue gas to form carbon dioxide and water, so as to reduce the subsequent treatment steps of the portion of the volatile organic compounds, thereby reducing the treatment amount of the subsequent deacidification treatment, and the rapid cooling of the flue gas using the regenerative burner 403 can also prevent the formation of dioxin.

It should be noted that after one cycle in the regenerative combustion furnace 403 is completed, the newly introduced flue gas always enters the regenerator (the second regenerator 4031b) that discharged the purge gas during the previous cycle, and the regenerator (the first regenerator 4031a) that originally entered the flue gas is used for transporting air, and the third regenerator 4031c is in the process of being heated by the purge gas (the heat cycle), and discharges the purge gas after being heated.

It should be noted that the dust discharged from the cyclone 401 and the filter dust collector 402 can be conveyed to the thermal desorption unit 203 for secondary treatment, so that the solid material in the dust is conveyed to the discharging system 30, and conveyed to the storage bin 304 for storage after passing through the discharging airlock 301, the discharging screw 302 and the discharging opening 303 in the discharging system 30, so as to reduce the risk of blockage of the regenerative burner 403.

The processing method and the processing device for the organic contaminated soil have at least one of the following beneficial effects:

(1) according to the method for treating the organic contaminated soil, which is provided by at least one embodiment of the disclosure, the volatile organic compounds in the organic contaminated soil can be subjected to harmless treatment.

(2) At least one embodiment of this disclosure provides a processing apparatus of organic contaminated soil can realize carrying out recycle to the heat that burns in the combustion chamber and produce.

(3) According to the method for treating the organic contaminated soil, which is provided by at least one embodiment of the disclosure, the regenerative combustion furnace is adopted to rapidly cool the flue gas, so that the formation of dioxin can be prevented.

The following points need to be explained:

(1) the drawings of the embodiments of the invention only relate to the structures related to the embodiments of the invention, and other structures can refer to common designs.

(2) The thickness of layers or regions in the figures used to describe embodiments of the invention may be exaggerated or reduced for clarity, i.e., the figures are not drawn on a true scale.

(3) Without conflict, embodiments of the present invention and features of the embodiments may be combined with each other to arrive at new embodiments.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention should be subject to the scope of the claims.