阅读说明：本技术 适用于Cl-VOCs处理的干法除酸系统及方法 (Dry-method deacidification system and method suitable for Cl-VOCs treatment ) 是由 何群伟 李良城 仲梅 于 2021-10-12 设计创作，主要内容包括：本发明涉及一种适用于Cl-VOCs处理的干法除酸系统及方法,系统包括RTO系统,RTO系统的下箱体出气口连接急冷塔中部的进气口,急冷塔的出气口连接文丘里反应器前的进料端,文丘里反应器的出气口连接旋风分离器,旋风分离器的顶端出气口连接除尘器且底端出灰口连接灰箱,除尘器的出气口通过引风机连通至烟囱且底部出灰口连接灰箱。本发明利用急冷塔对RTO热旁通尾气进行降温,采用文丘里反应器进行干式去除反应,利用旋风分离器继续进行干式去除反应去除反应后大颗粒产物,并利用脉冲袋式除尘器进行细颗粒物脱除,实现对Cl-VOCs的有效去除,避免避免传统干法、湿法除酸存在的工艺弊端。(The invention relates to a dry-method deacidification system and method suitable for Cl-VOCs treatment, wherein the system comprises an RTO system, an air outlet of a lower box body of the RTO system is connected with an air inlet in the middle of a quench tower, an air outlet of the quench tower is connected with a feeding end in front of a Venturi reactor, an air outlet of the Venturi reactor is connected with a cyclone separator, an air outlet at the top end of the cyclone separator is connected with a dust remover, an ash outlet at the bottom end of the cyclone separator is connected with an ash box, an air outlet of the dust remover is communicated to a chimney through a draught fan, and an ash outlet at the bottom of the dust remover is connected with the ash box. According to the invention, the quenching tower is used for cooling RTO hot bypass tail gas, the venturi reactor is used for dry removal reaction, the cyclone separator is used for continuously performing dry removal reaction to remove large particle products after reaction, and the pulse bag type dust collector is used for removing fine particles, so that the Cl-VOCs are effectively removed, and the process defects of the traditional dry and wet method deacidification are avoided.)

1. The utility model provides a dry process deacidification system suitable for Cl-VOCs handles, a serial communication port, including RTO system, quench tower, venturi reactor, cyclone, dust remover, ash bin and chimney, the air inlet at quench tower middle part is connected to RTO system's lower box gas outlet, the feed end before the venturi reactor is connected to the gas outlet of quench tower, cyclone is connected to the gas outlet of venturi reactor, the ash bin is connected to dust remover and bottom ash outlet in cyclone's top gas outlet connection, the gas outlet of dust remover communicates to chimney and bottom ash outlet and connects the ash bin through the draught fan, top installation spray thrower in the quench tower, the inlet tube is connected to the water inlet of spray thrower, the inlet pipe is connected to the feed end before the venturi reactor.

2. The dry acid removal system suitable for Cl-VOCs treatment according to claim 1, further comprising a hot bypass pipeline, wherein two ends of the hot bypass pipeline are respectively connected with the upper box of the RTO system and the top end of the quenching tower.

3. The dry acid removal system for the treatment of Cl-VOCs as claimed in claim 1, wherein said dust collector is a pulse bag collector.

4. The dry acid removal system suitable for Cl-VOCs processing of claim 3, wherein the ash box is an oscillating ash box, an ash discharge port is arranged at the bottom end of the ash box, an ash outlet is arranged at the upper end of the ash box, the ash outlet is communicated to a feeding pipe through an ash outlet pipeline, and an ash pump is arranged on the ash outlet pipeline.

5. A dry-method deacidification method suitable for Cl-VOCs treatment is characterized by comprising the following steps:

(1) chlorine-containing waste gas discharged from a lower box body of the RTO system enters a quenching tower through a pipeline, is mixed with high-temperature chlorine-containing waste gas from a hot bypass pipeline, is cooled in the quenching tower through cold water spraying, and is discharged into a feed end in front of a Venturi reactor;

(2) the feeding pipe sprays soda lime and activated carbon powder to the feeding end in front of the Venturi reactor, the chlorine-containing waste gas with water after being cooled by the quench tower is mixed with the soda lime and the activated carbon powder at the feeding end in front of the Venturi reactor and then enters the Venturi reactor for acid-base neutralization reaction to remove harmful corrosive gases such as HCl, dioxin and the like in the chlorine-containing waste gas;

(3) the gas-solid-liquid mixture after the mixing reaction in the Venturi reactor enters a cyclone separator, and the dry removal reaction is continuously carried out under the action of the cyclone separator, wherein a part of large-particle products after the reaction fall into a bottom ash bucket along the wall of the reactor under the action of centrifugal force and are discharged into an oscillating ash box, and the other part of finer particles which are not separated enter a pulse bag type dust collector from an exhaust pipe for removal;

(4) the fine particles are effectively removed by filtering through a pulse bag type dust collector and enter an oscillating type ash box through an ash hopper at the bottom, and the clean waste gas enters a chimney and then is discharged into the atmosphere.

6. The dry acid removal method for Cl-VOCs according to claim 5, further comprising a feeding pipe for continuously participating in the dry removal reaction, wherein the lower density large particle products after reaction in the oscillating ash box are deposited downwards, enter the bottom of the box body and are discharged through an ash discharge port, and part of the lower density smaller particles which do not participate in the reaction float on the top of the oscillating ash box and are introduced into the venturi reactor through an ash pump.

Technical Field

The invention relates to the technical field of waste gas treatment, in particular to a dry-method deacidification system and a dry-method deacidification method suitable for Cl-VOCs treatment.

Background

The chlorine-containing volatile organic compounds refer to volatile organic compounds in which more than 1 chlorine atom is substituted in the molecule of VOCs (volatile organic compounds), and mainly comprise small molecule Cl-VOCs such as chlorinated hydrocarbons, chlorinated olefins and chlorinated aromatic hydrocarbons, and high molecular mass Cl-VOCs such as polychlorinated dibenzodioxin, polychlorinated dibenzofuran, polychlorinated biphenyl and the like.

Compared with other VOCs, Cl-VOCs have more serious ecological environment risks, and once the Cl-VOCs enter an environmental medium, the Cl-VOCs are retained for a long time due to the characteristics of high volatility, environmental durability, biodegradability and the like, and particularly can participate in atmospheric photochemical reaction when the Cl-VOCs exist in the atmosphere, so that the Cl-VOCs are one of main contributors to atmospheric photochemical smog generation and ozone layer destruction. Meanwhile, Cl-VOCs also have great influence on greenhouse effect, and the global warming potentials of dichloromethane, chloroform, carbon tetrachloride and the like are respectively CO₂9, 25, 1300 times of. Among them, dioxin, which is an important member of Cl-VOCs, is one of the most toxic substances known to humans so far.

In the terminal control technology for Cl-VOCs, a thermal incineration method can realize efficient destruction of Cl-VOCs in a short time, but in the process of thermal incineration, due to the problem of reaction control, Cl-VOCs are incompletely combusted, high-toxicity byproducts such as dioxin are easily generated, and HCl generated is easy to corrode pipelines in the process of cooling.

In addition, the main methods for treating HCl in other types of production processes are divided into a dry method and a wet method, wherein the dry method mostly adopts alkaline lime as an absorbent or adopts an ion exchange method; wet processes are largely divided into three categories: condensation method, alkali liquor absorption method, and water absorption method. The main methods for treating the waste chlorine gas include a liquid chlorine production method, a synthetic hydrochloric acid method, a water absorption method, a solvent absorption method, a waste iron scrap absorption method, an alkali liquor absorption method and the like.

At present, the waste gas treatment of Cl-VOCs mainly depends on a composite process for treatment, wherein a mode of RTO (regenerative thermal oxidation) + alkaline washing spraying is more applied, the Cl-VOCs can be effectively removed, but a large amount of salt-containing waste water is generated, secondary pollution and resource waste are formed, in addition, toxic substances such as dioxin and the like possibly generated in the waste gas can not be effectively removed by the process, and the process has process defects.

Disclosure of Invention

The invention aims to provide a dry-method deacidification system and a dry-method deacidification method suitable for Cl-VOCs treatment, which are used for solving the problems that in the prior art, a large amount of salt-containing wastewater is generated by treating Cl-VOCs waste gas by adopting a composite process, so that secondary pollution is caused, and high-toxicity substances such as dioxin and the like possibly generated in the waste gas cannot be effectively removed.

The invention provides a dry-method deacidification system suitable for Cl-VOCs treatment, which comprises an RTO system, a quench tower, a Venturi reactor, a cyclone separator, a dust remover, an ash box and a chimney, wherein an air outlet of a lower box body of the RTO system is connected with an air inlet in the middle of the quench tower, an air outlet of the quench tower is connected with a feeding end in front of the Venturi reactor, an air outlet of the Venturi reactor is connected with the cyclone separator, an air outlet at the top end of the cyclone separator is connected with the dust remover, an ash outlet at the bottom end of the cyclone separator is connected with the ash box, an air outlet of the dust remover is communicated with the chimney through a draught fan, an ash outlet at the bottom of the dust remover is connected with the ash box, a sprayer is installed at the top in the quench tower, a water inlet of the sprayer is connected with a water inlet pipe, and a feeding end in front of the Venturi reactor is connected with a feeding pipe.

And the two ends of the hot bypass pipeline are respectively connected with the upper box body of the RTO system and the top end of the quenching tower.

Further, the dust remover is a pulse bag type dust remover.

Further, the ash bin is the oscillating ash bin, the bottom of ash bin sets up row ash mouth, and the upper end sets up the ash hole, the ash hole communicates to the inlet pipe through the ash pipe, install the ash pump on the ash pipe.

The invention also provides a dry-method deacidification method suitable for Cl-VOCs treatment, which comprises the following steps:

(1) chlorine-containing waste gas discharged from a lower box body of the RTO system enters a quenching tower through a pipeline, is mixed with high-temperature chlorine-containing waste gas from a hot bypass pipeline, is cooled in the quenching tower through cold water spraying, and is discharged into a feed end in front of a Venturi reactor;

(2) the feeding pipe sprays soda lime and activated carbon powder to the feeding end in front of the Venturi reactor, the chlorine-containing waste gas with water after being cooled by the quench tower is mixed with the soda lime and the activated carbon powder at the feeding end in front of the Venturi reactor and then enters the Venturi reactor for acid-base neutralization reaction to remove harmful corrosive gases such as HCl, dioxin and the like in the chlorine-containing waste gas;

(3) the gas-solid-liquid mixture after the mixing reaction in the Venturi reactor enters a cyclone separator, and the dry removal reaction is continuously carried out under the action of the cyclone separator, wherein a part of large-particle products after the reaction fall into a bottom ash bucket along the wall of the reactor under the action of centrifugal force and are discharged into an oscillating ash box, and the other part of finer particles which are not separated enter a pulse bag type dust collector from an exhaust pipe for removal;

(4) the fine particles are effectively removed by filtering through a pulse bag type dust collector and enter an oscillating type ash box through an ash hopper at the bottom, and the clean waste gas enters a chimney and then is discharged into the atmosphere.

And further comprises that large-particle products with higher density after reaction in the oscillating ash box are deposited downwards, enter the bottom of the box body and are discharged through an ash discharge port, and part of small particles with lower density which do not participate in the reaction float on the top of the oscillating ash box and are introduced into a feeding pipe in front of the Venturi reactor through an ash pump to continuously participate in the dry removal reaction.

The technical scheme of the invention has the beneficial effects that:

according to the invention, the quenching tower is used for cooling RTO hot bypass tail gas, the venturi reactor is used for dry removal reaction, on one hand, the reaction space is enlarged, on the other hand, the reaction time is prolonged, and the dry removal reaction is ensured to be sufficient;

the cyclone separator is used for continuously carrying out dry-type removal reaction and removing large-particle products after the reaction, and the pulse bag type dust collector is used for removing fine particles, so that Cl-VOCs are effectively removed, a large amount of salt-containing wastewater generated by the traditional wet-method deacidification process is avoided, secondary pollution and resource waste are avoided, high-toxicity substances such as dioxin possibly generated in waste gas can be effectively removed, and the process defects of the traditional dry-method and wet-method deacidification are avoided;

realize the layering of different density particulate matters, utilize the ash pump to realize the reutilization of the little particulate matter of not participating in the reaction.

Drawings

FIG. 1 is a schematic diagram of a dry acid removal system suitable for Cl-VOCs treatment according to the present invention;

in the drawings, the components represented by the respective reference numerals are listed below:

the method comprises the following steps of 1-RTO system, 2-quench tower, 3-Venturi reactor, 4-cyclone separator, 5-dust remover, 6-ash box, 7-chimney, 8-water inlet pipe, 9-feeding pipe, 10-hot by-pass pipeline, 11-ash discharge port, 12-ash discharge pipe, 13-ash pump and 14-induced draft fan.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.

As shown in fig. 1, the dry deacidification system suitable for Cl-VOCs treatment in the present embodiment comprises an RTO system 1, a quench tower 2, a venturi reactor 3, a cyclone separator 4, a dust collector 5, an ash box 6 and a chimney 7, wherein an air outlet of a lower box body of the RTO system 1 is connected with an air inlet at the middle part of the quench tower 2, an air outlet of the quench tower 2 is connected with a feeding end in front of the venturi reactor 3, an air outlet of the venturi reactor 3 is connected with the cyclone separator 4, a top air outlet of the cyclone separator 4 is connected with the dust collector 5 and a bottom ash outlet is connected with the ash box 6, an air outlet of the dust collector 5 is communicated with the chimney 7 and the bottom ash outlet is connected with the ash box 6 through an induced draft fan 14, a spray thrower is installed at the top in the quench tower 2, an water inlet of the thrower is connected with a water inlet pipe 8, and high temperature waste gas is sprayed in the quench tower 2 through cold water to cool, the feed end in front of the venturi reactor 3 is connected with the feed pipe 9, soda lime and activated carbon powder are sprayed into the feed end through the feed pipe 9 for dry acid-base neutralization reaction to remove harmful corrosive gases such as HCl and dioxin in chlorine-containing waste gas, the flow rate of the waste gas is changed through the change of the pipe diameter under the action of the venturi reactor 3, the mixing reaction time is prolonged, and the dry removal reaction is ensured to be sufficient.

Preferably, the system further comprises a heat bypass pipeline 10, wherein two ends of the heat bypass pipeline 10 are respectively connected with the upper box of the RTO system 1 and the top end of the quenching tower 2, and the heat bypass pipeline 10 is additionally arranged on the upper box of the RTO system 1, so that the over-temperature of the upper box of the RTO is avoided under the condition of controlling the volume of the RTO system.

Preferably, the dust remover 5 is a pulse bag type dust remover, and the dust removal is performed on the dust remover 5 through pulse control, so that the operation power consumption of the system is reduced.

Preferably, the ash box 6 is an oscillating ash box, the bottom end of the ash box 6 is provided with an ash discharge port 11, the upper end of the ash box is provided with an ash discharge port, the ash discharge port is communicated to the feeding pipe 9 through an ash discharge pipe 12, an ash pump 13 is installed on the ash discharge pipe 12, large-particle products after reaction with high density in the ash box 6 are deposited downwards under the action of an oscillator of the oscillating ash box 6, enter the bottom of the box body and are discharged through the ash discharge port 11, and part of small particles with low density which do not participate in the reaction float on the top of the ash box 6 and are introduced into the feeding pipe 9 in front of the venturi reactor 3 through the ash pump 13 to continuously participate in the removal reaction, so that the waste of dry reaction materials is reduced.

The working method of the dry-method deacidification system suitable for Cl-VOCs treatment comprises the following steps:

(1) chlorine-containing waste gas discharged from a lower box body of the RTO system 1 enters a quenching tower 2 through a pipeline, is mixed with high-temperature chlorine-containing waste gas from a hot bypass pipeline 10, is cooled by cold water spraying in the quenching tower 2, and is discharged into a feeding end in front of a Venturi reactor 3;

(2) a feeding pipe 9 sprays soda lime and activated carbon powder to a feeding end in front of the venturi reactor 3, the chlorine-containing waste gas with water after being cooled by the quench tower 2 is mixed with the soda lime and the activated carbon powder at the feeding end in front of the venturi reactor 3 and then enters the venturi reactor 3 for acid-base neutralization reaction to remove harmful corrosive gases such as HCl, dioxin and the like in the chlorine-containing waste gas;

(3) the gas-solid-liquid mixture after the mixing reaction in the Venturi reactor 3 enters a cyclone separator 4, and the dry removal reaction is continuously carried out under the action of the cyclone separator 4, wherein a part of large-particle products after the reaction fall into a bottom ash bucket along the wall of the reactor and are discharged into an oscillating ash box 6 under the action of centrifugal force, and the other part of fine particles which are not separated enter a pulse bag type dust collector 5 from an exhaust pipe for removal;

(4) the fine particles are effectively removed by the pulse bag type dust collector 5 and are attached to the surface of a cloth bag to form a powder cake layer, the dust removal efficiency of the cloth bag is improved, when the powder cake layer is accumulated to a certain thickness, the pulse control is started to clean the dust of the dust collector 5, the operation power consumption of the system is reduced, the particles removed by the bag type dust collector 5 enter the vibration type dust box 6 through the dust hopper, and the clean waste gas enters the chimney 7 and is discharged into the atmosphere.

Preferably, an oscillating ash box 6 is adopted, large particle products after reaction with higher density in the ash box 6 are deposited downwards, enter the bottom of the box body and are discharged through an ash discharge port 11, and part of smaller particles with lower density which do not participate in the reaction float on the top of the oscillating ash box 6 and are introduced into a feeding pipe 9 of the venturi reactor 3 through an ash pump 13 to continue to participate in the dry removal reaction.

In conclusion, the RTO hot bypass tail gas is cooled by the quench tower, the dry removal reaction is carried out by the venturi reactor, and the reaction space is enlarged by the venturi reactor, the reaction time is prolonged, and the dry removal reaction is ensured to be sufficient; the cyclone separator is used for continuously carrying out dry-type removal reaction and removing large-particle products after the reaction, and the pulse bag type dust collector is used for removing fine particles, so that Cl-VOCs are effectively removed, a large amount of salt-containing wastewater generated by the traditional wet-method deacidification process is avoided, secondary pollution and resource waste are avoided, high-toxicity substances such as dioxin possibly generated in waste gas can be effectively removed, and the process defects of the traditional dry-method and wet-method deacidification are avoided; realize the layering of different density particulate matters, utilize the ash pump to realize the reutilization of the little particulate matter of not participating in the reaction.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.