阅读说明：本技术 一种高含水油泥清洁燃烧处理装置 (High-water-content oil sludge clean combustion treatment device ) 是由 张光义 王芳 曾玺 张建岭 崔彦斌 于 2021-07-30 设计创作，主要内容包括：本发明提供了一种高含水油泥清洁燃烧处理装置,所述处理装置包括油水固分离装置与流化床燃烧装置,先通过油水固分离装置将油泥分为油包水、水包油以及油泥渣,再通过流化床燃烧装置将油包水以及油泥渣进行耦合气化燃烧,一方面,产生的以CO为主要组分的强还原性挥发分可以有效抑制烟气中NO-(x)的生成,从而实现低NO-(x)烟气的排放,另一方面,气化燃烧生成的高温烟气则可以在烟气除尘净化后,通过换热器实现热量回收。因此,本发明所述处理装置实现了高含水油泥的终极清洁燃烧处理和能量回收利用,具有良好的节能减排效果,可以用于危废资源化处理,可以发挥经济、高效和环保的优势。(The invention provides a high-water-content oil sludge clean combustion treatment device which comprises an oil-water-solid separation device and a fluidized bed combustion device, wherein oil sludge is divided into water-in-oil, oil-in-water and oil sludge through the oil-water-solid separation device, and then the water-in-oil and the oil sludge are subjected to coupled gasification combustion through the fluidized bed combustion device, so that on one hand, the generated strong reducing volatile component taking CO as a main component can effectively inhibit NO in smoke x Thereby achieving low NO x On the other hand, the high-temperature flue gas generated by gasification and combustion can realize heat recovery through the heat exchanger after the flue gas is dedusted and purified. Therefore, the treatment device provided by the invention realizes final clean combustion treatment and energy recycling of the high-water-content oil sludge, has good energy-saving and emission-reducing effects, can be used for resource treatment of hazardous wastes, and can exert the advantages of economy, high efficiency and environmental protection.)

1. The high-water-content oil sludge clean combustion treatment device is characterized by comprising an oil-water-solid separation device and a fluidized bed combustion device; the oil-water-solid separation device comprises an oil sludge feed inlet arranged at the upper part, a water-in-oil outlet arranged at the middle upper part, an oil-in-water outlet arranged at the middle lower part and an oil sludge outlet arranged at the bottom; the fluidized bed combustion device comprises an oil inlet arranged at the middle upper part, a mud inlet arranged at the middle lower part, a primary air inlet arranged at the bottom, a secondary air inlet arranged at the middle lower part and positioned below the oil inlet, a tertiary air inlet arranged at the middle upper part and positioned above the oil inlet, a slag discharge port arranged at the bottom and a flue gas outlet arranged at the top; the water-in-oil outlet is connected with the oil inlet through a water-in-oil conveying pipeline, and the oil sludge outlet is connected with the mud inlet through an oil sludge conveying pipeline;

the treatment device also comprises a gas-solid separator and a heat exchanger, wherein the inlet of the gas-solid separator is connected with the flue gas outlet, the gas outlet of the gas-solid separator is connected with the heat source inlet of the heat exchanger, and the heat source outlet of the heat exchanger is connected with the smoke exhaust pipe.

2. The processing apparatus of claim 1, wherein the fluidized bed combustion apparatus further comprises a return port disposed at a middle lower portion, the return port being connected to the solids outlet of the gas-solid separator.

3. The treatment device according to claim 1 or 2, wherein the oil-in-water outlet is connected to an oil-in-water delivery pipe, and the water-in-oil delivery pipe and the oil-in-water delivery pipe are connected by an oil-water parallel pipe.

4. The processing apparatus according to any one of claims 1 to 3, further comprising an atomizing injector, the atomizing injector being disposed outside the fluidized bed combustion apparatus, an inlet of the atomizing injector being connected to the oil inlet, and an outlet of the atomizing injector being connected to the oil inlet.

5. The processing apparatus according to claim 4, wherein the atomizing injector comprises a closed annular tube on which an inlet and 3-10 outlets are provided.

6. Treatment plant according to any of claims 1-5, characterized in that a centrifugal pump is arranged on the water-in-oil transfer conduit near the end of the fluidized bed combustion plant.

7. A treatment plant according to any of claims 1-6, characterized in that a motor and a conveyor are arranged on the sludge transfer line.

8. The treatment apparatus according to any one of claims 1 to 7 wherein the primary air inlet comprises a wind distribution plate.

9. The process arrangement according to any one of claims 1 to 8, wherein the heat exchanger is a boiler heat exchanger.

10. The process arrangement of any one of claims 1 to 9, wherein the gas-solid separator is a cyclone.

Technical Field

The invention relates to the technical field of solid waste treatment and recycling, in particular to high-water-content oil sludge, and particularly relates to a high-water-content oil sludge clean combustion treatment device.

Background

Oil sludge is mainly generated in the petroleum industry, and can be generated in the links of petroleum extraction, transportation, storage, processing and the like, and can also be generated in the metal processing industry (such as plate extension). The oil sludge is a mixture of various petroleum hydrocarbons, water, solid particles (such as mud and heavy metals) and other substances (such as a surfactant), and the upper oil-water part is usually in an emulsion state. In many countries in the world, including China, oil sludge has been classified as a hazardous waste, and the amount of water-containing oil sludge discharged annually by the petrochemical industry alone in China is 300 million tons. If the sludge is not properly treated, the environment and human health are seriously harmed. The oil sludge not only contains toxic and harmful substances, but also contains some petroleum substances, and if the heat of the petroleum can be recovered and utilized, the energy consumption of the treatment process and even the external heat supply can be effectively reduced.

Sludge is high in viscosity, poor in fluidity, and contains more water, in the form of a water-in-oil (W/O) emulsion. The emulsion may form a rigid film at the W/O interface, making it difficult for the water droplets to bond to each other. The traditional physical methods (such as plate-and-frame pressure filtration, centrifugal separation and rotary vacuum filtration) can not obtain ideal dehydration effect, and in order to improve the quality of produced oil and recovered oil, a demulsifier is usually added to separate emulsified water and improve the concentration of an oil phase.

However, as the components of the oil sludge are variable and complex, no oil sludge treatment technology with high raw material adaptability, maturity, availability and low cost is formed at present. Some of the sludge treatment technologies developed in recent years mainly include landfill methods, incineration methods, solvent extraction methods, drying and reducing methods, and the like. Among them, the landfill method is currently used the most, occupies a large amount of land resources, and because the high-water-content oil sludge cannot be treated, resources are wasted, and the environment is polluted. The incineration method consumes much energy because the water content in the high-water-content oil sludge is higher than 80%, and simultaneously generates a large amount of waste gas, so that the equipment investment and the operating cost are also higher. The solvent extraction method uses a large amount of extracting agents in the solvent extraction process, so that the cost is high, and the equipment maintenance cost, depreciation cost and treatment cost in the process are high. The drying decrement method is a pure decrement method, and because the water in the oil sludge is mainly in an emulsified state, the drying decrement method is difficult to dehydrate and has the problems of flammability, explosiveness and easy coking and blockage of equipment. Whichever method is adopted for the treatment, the lower the water content of the sludge, the better. The water content is low, the sludge reprocessing amount is small, and the energy consumption loss is small if the subsequent resource treatment is carried out; if the subsequent landfill is carried out, the cost is lower; and vice versa. With stricter environmental laws and regulations of various countries in the world, the requirements of oil sludge reduction, stabilization and resource treatment are higher and higher. Currently, the main objective of sludge treatment technology is to recover some hydrocarbons (typically only 15% to 50%) from low water content sludge, but the resulting residue (50% to 85% of the total hydrocarbons in the sludge) is still subject to final disposal. Moreover, the water content of the residual oil sludge after extraction is higher, the thermochemical activity of the solid product (pyrolysis product is often called as oil sludge coke) is deteriorated, the ultimate treatment difficulty of the product is higher, and if the obtained high-water-content oil sludge is not effectively utilized, the resource is still wasted greatly.

The final treatment of the high-water-content oil sludge mainly adopts a chemical method, a biochemical method and a one-step combustion method, and the methods are generally high in cost, long in treatment time and easy to cause secondary pollution. For example, CN110451754A discloses a harmless treatment method for pyrolysis of oil sludge, which comprises the following steps: pretreating oil sludge; pyrolyzing oil sludge; pyrolysis oil-gas separation; decarbonizing pyrolysis slag, regenerating heat carrier, etc. The oil sludge is subjected to primary treatment and then enters a pyrolyzer, and mild pyrolysis is carried out under the action of a heat carrier; and condensing and separating the oil gas after pyrolysis to obtain pyrolysis oil and pyrolysis gas. PyrolysisAnd after the slag and the heat carrier are combusted, decarbonization and regeneration, a part of the slag and the heat carrier returns to the pyrolyzer for recycling, and the pyrolysis gas is combusted to supply heat to the heat carrier and remove carbon deposition on the pyrolysis slag. However, the pyrolysis method is not only complicated in operation and high in treatment cost, but also cannot effectively control NO of flue gas in the pyrolysis process_xAnd (4) concentration.

Aiming at high water-containing oil sludge, including products obtained after hydrocarbon is extracted and recovered from the oil sludge and high oil-containing water biomass semicoke waste generated by biomass heat treatment, if high solid oil sludge is separated in advance and an oil-containing part is concentrated, oil-residue coupling clean combustion is carried out, namely oil-water-solid separation-decoupling combustion is carried out, the ultimate treatment can be relatively thorough, partial heat energy can be efficiently recovered, and meanwhile, a large amount of volatile matters after pyrolysis can be utilized to carry out NO in flue gas_xReducing and reducing the pollutant discharge to the maximum extent. Therefore, the development of a high-water-content oil sludge clean combustion treatment device is needed at present.

Disclosure of Invention

In view of the problems in the prior art, the invention provides a high-water-content oil sludge clean combustion treatment device which comprises an oil-water-solid separation device and a fluidized bed combustion device, wherein oil sludge is firstly separated into water-in-oil, oil-in-water and oil sludge through the oil-water-solid separation device, and then the water-in-oil and the oil sludge are subjected to coupled gasification combustion through the fluidized bed combustion device, on one hand, the generated strong reducing volatile component taking CO as a main component can effectively inhibit NO in smoke gas_xThereby achieving low NO_xOn the other hand, the high-temperature flue gas generated by gasification and combustion can realize heat recovery through the heat exchanger after the flue gas is dedusted and purified. Therefore, the treatment device provided by the invention realizes final clean combustion treatment and energy recycling of the high-water-content oil sludge, has good energy-saving and emission-reducing effects, can be used for resource treatment of hazardous wastes, and can exert the advantages of economy, high efficiency and environmental protection.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention aims to provide a high-water-content oil sludge clean combustion treatment device, which comprises an oil-water-solid separation device and a fluidized bed combustion device; the oil-water-solid separation device comprises an oil sludge feed inlet arranged at the upper part, a water-in-oil outlet arranged at the middle upper part, an oil-in-water outlet arranged at the middle lower part and an oil sludge outlet arranged at the bottom; the fluidized bed combustion device comprises an oil inlet arranged at the middle upper part, a mud inlet arranged at the middle lower part, a primary air inlet arranged at the bottom, a secondary air inlet arranged at the middle lower part and positioned below the oil inlet, a tertiary air inlet arranged at the middle upper part and positioned above the oil inlet, a slag discharge port arranged at the bottom and a flue gas outlet arranged at the top; the water-in-oil outlet is connected with the oil inlet through a water-in-oil conveying pipeline, and the oil sludge outlet is connected with the mud inlet through an oil sludge conveying pipeline;

the treatment device also comprises a gas-solid separator and a heat exchanger, wherein the inlet of the gas-solid separator is connected with the flue gas outlet, the gas outlet of the gas-solid separator is connected with the heat source inlet of the heat exchanger, and the heat source outlet of the heat exchanger is connected with the smoke exhaust pipe.

The treatment device comprises an oil-water-solid separation device, a water-in-oil liquid layer, an oil-in-water liquid layer and a solid oil sludge layer, wherein the oil-water-solid separation device is used for sequentially separating high-water-content oil sludge into the water-in-oil liquid layer, the oil-in-water liquid layer and the solid oil sludge layer from top to bottom; wherein, solid oil sludge enters the bottom of the fluidized bed combustion device through a sludge inlet, fluidized combustion is realized under the combustion supporting of fluidized air supplied by a primary air inlet, the ash generated after combustion is discharged through a slag discharge port, the gasified gas generated after combustion moves upwards, a water-in-oil liquid layer enters the middle upper part of the fluidized bed combustion device through an oil inlet and sprays downwards, is mixed with the gasified gas moving upwards and secondary air and generates rich oil (rich fuel) combustion, and the reduction gas atmosphere taking CO as the main component is formed due to oxygen deficiency, so that NO can be controlled in situ_xGenerating to realize in-situ nitrogen control; finally, in the upper area of the oil inlet, the unburned gas and oil sludge coke (mainly generated by pyrolysis and gasification of solid oil sludge) are reburnt and burnt under the action of tertiary air supply, sufficient air is supplied through the tertiary air inlet to finish burning of smoke, and the burnt low NO is_xThe high-temperature flue gas with concentration is discharged from a flue gas outlet,the smoke dust is purified by a gas-solid separator and then enters a heat exchanger to recover heat.

The treatment device can realize the liquid-solid separation of oil sludge, the liquid/solid transportation and the liquid/solid coupling low NO_xThe fluidized bed combustion device is roughly divided into a fluidized combustion area, an oxygen-deficient combustion area and an ember area from bottom to top according to the action effects of primary air, secondary air and tertiary air, so that NO in smoke is effectively reduced_xThe in-situ nitrogen control is realized.

The treatment device comprises an oil-water-solid separation device and a fluidized bed combustion device, oil sludge is firstly separated into water-in-oil, oil-in-water and oil sludge through the oil-water-solid separation device, and then the water-in-oil and the oil sludge are subjected to coupled gasification combustion through the fluidized bed combustion device, so that on one hand, the generated strong reducing volatile component taking CO as a main component can effectively inhibit NO in smoke_xThereby achieving low NO_xOn the other hand, the high-temperature flue gas generated by gasification and combustion can realize heat recovery through the heat exchanger after the flue gas is dedusted and purified. Therefore, the treatment device provided by the invention realizes final clean combustion treatment and energy recycling of the high-water-content oil sludge, has good energy-saving and emission-reducing effects, can be used for resource treatment of hazardous wastes, and can exert the advantages of economy, high efficiency and environmental protection.

It is worth noting that the oil-water-solid separation device and the fluidized bed combustion device have more openings, the invention emphasizes the position relation of the openings in height, and the position relation of the openings in the horizontal direction can be adjusted by a person skilled in the art according to actual conditions. For example, the oil-water-solid separator according to the present invention includes an oil sludge feed port provided at an upper portion and a water-in-oil outlet provided at an intermediate upper portion, and it is preferable that the oil sludge feed port is provided at one side of the oil-water-solid separator and the water-in-oil outlet is provided at the other side of the oil-water-solid separator for simplification of a material line.

As a preferable technical scheme of the invention, the fluidized bed combustion device further comprises a material returning port arranged at the middle lower part, and the material returning port is connected with a solid outlet of the gas-solid separator.

It is worth to say that the gas-solid separator of the invention can intercept the large particle fly ash in the flue gas, wherein the large particle fly ash contains a certain amount of combustible materials, and the large particle fly ash is guided into the fluidized combustion area of the fluidized bed combustion device through the material return opening of the fluidized bed combustion device, so that the large particle fly ash can be fluidized and gasified and combusted, the heat in the large particle fly ash can be fully recovered, and the secondary pollution caused by the direct discharge of the large particle fly ash can be avoided.

As a preferable technical scheme of the invention, the oil-in-water outlet is connected with an oil-in-water conveying pipeline, and the water-in-oil conveying pipeline and the oil-in-water conveying pipeline are connected through an oil-water parallel pipeline.

It is worth to say that, the processing device of the invention is arranged on an oil-in-water conveying pipeline, an oil-water parallel pipeline is arranged to guide part of oil-in-water into a water-in-oil conveying pipeline, and then the water-in-oil and part of oil-in-water are mixed and sprayed into a fluidized bed combustion device through an oil inlet to carry out oxygen-deficient combustion, so that not only can part of oil combustible materials in the oil-in-water be recovered, but also water required by the oxygen-deficient combustion can be provided, and the other part of the oil-in-water is discharged through the oil-in-water conveying pipeline; in addition, the oil-in-water conveying pipeline, the water-in-oil conveying pipeline and the oil-water parallel pipeline are respectively provided with an auxiliary pipe fitting valve, the mixing amount of oil-in-water can be adjusted by utilizing the auxiliary pipe fitting valves according to the property and the combustion state of raw material oil sludge, and the temperature of high-temperature flue gas can be regulated and controlled.

As a preferable technical scheme, the treatment device further comprises an atomizing injector, the atomizing injector is arranged outside the fluidized bed combustion device, an inlet of the atomizing injector is connected with the oil inlet, and an outlet of the atomizing injector is connected with the oil inlet.

In a preferred embodiment of the present invention, the atomizing injector comprises a closed annular tube, and the closed annular tube is provided with an inlet and 3 to 10 outlets, for example, 3, 4, 5, 8, or 10 outlets, but the present invention is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.

It is worth to say that the outlets on the closed annular pipe are all provided with nozzles which are uniformly distributed, and the water-in-oil is sprayed into the fluidized bed combustion device in an inclined downward spraying mode, so that the contact area of oil combustible materials in the water-in-oil with gasification gas and secondary air from a fluidized combustion zone can be increased as much as possible, and the oil combustible materials can be fully ensured to realize oxygen-deficient combustion; in addition, this application atomizing sprayer only gets into fluidized bed combustion device with the nozzle in exit inside, and the main part especially closed ring venturi tube all is located fluidized bed combustion device outside, not only can prevent that atomizing sprayer from causing the influence to gas flow in the fluidized bed, can prevent again that the heat that the burning obtained is used for water-in-oil to preheat and cause the waste.

As a preferable technical scheme of the invention, a centrifugal pump is arranged at one end of the water-in-oil conveying pipeline close to the fluidized bed combustion device.

It is worth to say that the centrifugal pump can improve the pressure of water-in-oil entering the fluidized bed combustion device, and is beneficial to spraying the water-in-oil into the oxygen-deficient combustion area for combustion.

As a preferred technical solution of the present invention, a motor and a conveyor are provided on the sludge conveying pipe, preferably, the motor is a variable frequency motor, and the conveyor is a screw conveyor.

It is worth to say that the upper end of the oil sludge conveying pipeline is connected with an oil sludge outlet of the oil-water-solid separation device, the lower end of the oil sludge conveying pipeline is connected with a screw conveyor driven by a variable frequency motor, and the screw conveyor is connected with a mud material inlet of the fluidized bed combustion device, so that the controllable amount conveying of solid oil sludge can be realized.

As a preferable technical scheme of the invention, the primary air inlet comprises an air distribution plate, and the air distribution plate comprises an adjustable air cap system for adjusting the position of an air supply port and the air volume.

As the preferable technical scheme of the invention, the heat exchanger is a boiler heat exchanger and can load a waste heat boiler to produce hot water/steam.

It is worth to be noted that, the heat exchanger of the present invention corresponds to a device that utilizes heat generated by oil sludge, and a person skilled in the art can reasonably select the heat exchanger according to actual needs, which is similar to the heat exchanger of the boiler heat exchanger of the present invention that can utilize high-temperature flue gas.

As a preferable technical scheme of the invention, the gas-solid separator is a cyclone separator.

It is worth to say that the cyclone separator has good gas-solid separation effect and small occupied area, and is beneficial to the popularization and the application of the treatment device.

Compared with the prior art, the invention at least has the following beneficial effects:

(1) according to the treatment device, oil sludge is firstly separated into water-in-oil, oil-in-water and oil sludge through the oil-water-solid separation device, and then the water-in-oil and the oil sludge are subjected to coupled gasification combustion through the fluidized bed combustion device, so that on one hand, the generated strong reducing volatile component taking CO as a main component can effectively inhibit NO in smoke_xThereby achieving low NO_xOn the other hand, the high-temperature flue gas generated by gasification and combustion can realize heat recovery through a heat exchanger after the flue gas is dedusted and purified;

(2) the treatment device provided by the invention realizes ultimate clean combustion treatment and energy recycling of high-water-content oil sludge, has good energy-saving and emission-reducing effects, can be used for resource treatment of hazardous wastes, and can exert the advantages of economy, high efficiency and environmental protection.

Drawings

Fig. 1 is a schematic diagram of a high water content sludge clean combustion treatment plant according to example 1 of the present invention;

FIG. 2 is a schematic structural view of an atomizing injector according to embodiment 1 of the present invention;

in the figure: 1-oil-water-solid separation device; 11-sludge feed port; 12-water-in-oil outlet; 13-oil-in-water outlet; 14-oil sludge outlet; 2-a fluidized bed combustion device; 21-oil import; 22-a pug inlet; 23-primary air inlet; 24-a secondary air inlet; 25-tertiary air inlet; 26-a slag discharge port; 27-a flue gas outlet; 28-material returning port; 3-gas-solid separator; 4-a heat exchanger; 5-atomizing the injector; 51-closed ring tube; 52-a nozzle; 6-a centrifugal pump; 7-a motor; 8-a conveyor.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

In the description of the present invention, the terms "left", "right", "up", "down", and the like are based on the positional relationship shown in the drawings, and are only for convenience of description and simplification of operation, but do not indicate that the apparatus must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. In addition, the terms "primary air", "secondary air" and "tertiary air" are used only for distinguishing between air supply sequences and have no special meaning.

To better illustrate the invention and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the invention are as follows:

example 1

The embodiment provides a high water content oil sludge clean combustion treatment device, as shown in fig. 1, the treatment device comprises an oil-water-solid separation device 1 and a fluidized bed combustion device 2; the oil-water-solid separation device 1 comprises an oil sludge inlet 11 arranged at the upper part, a water-in-oil outlet 12 arranged at the middle upper part, an oil-in-water outlet 13 arranged at the middle lower part and an oil sludge outlet 14 arranged at the bottom; the fluidized bed combustion device 2 comprises an oil inlet 21 arranged at the middle upper part, a mud inlet 22 arranged at the middle lower part, a primary air inlet 23 arranged at the bottom, a secondary air inlet 24 arranged at the middle lower part and positioned below the oil inlet 21, a tertiary air inlet 25 arranged at the middle upper part and positioned above the oil inlet 21, a slag discharge port 26 arranged at the bottom and a flue gas outlet 27 arranged at the top; the water-in-oil outlet 12 is connected with the oil inlet 21 through a water-in-oil conveying pipeline, and the sludge outlet 14 is connected with the sludge inlet 22 through a sludge conveying pipeline;

the treatment device also comprises a gas-solid separator 3 and a heat exchanger 4, wherein the inlet of the gas-solid separator 3 is connected with the flue gas outlet 27, the gas outlet of the gas-solid separator 3 is connected with the heat source inlet of the heat exchanger 4, and the heat source outlet of the heat exchanger 4 is connected with a smoke exhaust pipe;

the fluidized bed combustion device 2 further comprises a material return port 28 arranged at the middle lower part, and the material return port 28 is connected with a solid outlet of the gas-solid separator 3; the oil-in-water outlet 13 is connected with an oil-in-water conveying pipeline, and the water-in-oil conveying pipeline is connected with the oil-in-water conveying pipeline through an oil-water parallel pipeline;

the treatment device further comprises an atomizing injector 5, the atomizing injector 5 is arranged outside the fluidized bed combustion device 2, an inlet of the atomizing injector 5 is connected with the oil inlet 21, and an outlet of the atomizing injector 5 is connected with the oil inlet 21; as shown in fig. 2, the atomizing injector 5 includes a closed-loop pipe 51, and an inlet and 4 nozzles 52 are provided on the closed-loop pipe 51;

a centrifugal pump 6 is arranged at one end of the water-in-oil conveying pipeline close to the fluidized bed combustion device 2; a motor 7 and a conveyor 8 are arranged on the oil sludge conveying pipeline; the primary air inlet 23 comprises an air distribution plate; the heat exchanger 4 is a boiler heat exchanger; the gas-solid separator 3 is a cyclone separator.

Application example 1

This application example provides a method for clean combustion of high water content oil sludge by using the treatment device described in example 1, which comprises the following steps:

a certain amount of high-water-content oil sludge enters an oil-water-solid separation device 1 through an oil sludge feeding hole 11 to carry out solid-liquid separation, the lower layer is a solid oil sludge layer, the middle upper layer is an oil-water emulsion, and the oil-water emulsion is further separated in a standing (and/or air floatation) mode, wherein the upper layer is mainly a water-in-oil liquid layer, and the middle layer is mainly an oil-in-water liquid layer;

the solid oil sludge flows out from the oil sludge outlet 14, enters the bottom of the fluidized bed combustion device 2 through the sludge inlet 22 under the action of the motor 7 and the conveyor 8, realizes fluidized combustion under the combustion supporting of fluidized air supplied by the primary air inlet 23, discharges generated ash through the slag discharge port 26, and generates gasified gas which moves upwards;

water-in-oil liquid layerFlows out from the water-in-oil outlet 12 under the action of the centrifugal pump 6, flows into the closed annular pipe 51 of the atomizing injector 5 through the oil inlet 21 through the water-in-oil conveying pipeline, then enters the middle upper part of the fluidized bed combustion device 2 through the nozzle 52 and sprays downwards, is mixed with gasification gas moving upwards and secondary air, and generates rich oil (rich fuel) combustion, and because oxygen is lack, a reducing gas atmosphere with CO as a main component is formed, NO can be controlled in situ_xGenerating to realize in-situ nitrogen control; finally, in the upper area of the oil inlet 21, the unburned gas and oil sludge coke (mainly generated by pyrolysis and gasification of solid oil sludge) are reburnt and burnt under the action of tertiary air supply, sufficient air is supplied through a tertiary air inlet 25 to complete burning of smoke, and low NO after burning is realized_xThe high-temperature flue gas with concentration is discharged from a flue gas outlet, the flue gas is purified by a gas-solid separator 3 and then enters a heat exchanger 4 to recover heat, large-particle fly ash in the flue gas intercepted by the gas-solid separator 3 enters a fluidized combustion area of the fluidized bed combustion device 2 through a return port 28 of the fluidized bed combustion device, the flue gas discharged from the heat source outlet of the heat exchanger 4 can also be used for air preheating and then enters the fluidized bed combustion device 2 as primary air, secondary air and tertiary air, and therefore the air supply temperature of the fluidized bed combustion device is improved.

In addition, according to the combustion state of the fluidized bed combustion device 2 and in combination with the treatment requirement of the oil-in-water liquid, a proper amount of the oil-in-water liquid can be introduced into the water-in-oil conveying pipeline through the oil-water parallel pipeline, so that the water-in-oil and part of the oil-in-water are mixed and enter the fluidized bed combustion device 2 through the action of the centrifugal pump 6 to carry out oxygen-deficient combustion, and the other part of the oil-in-water is discharged through the oil-in-water conveying pipeline; if the water in the fluidized bed combustion device 2 is excessive and the combustion stable state is influenced, the amount of oil in water used for combustion is adjusted through an auxiliary pipe fitting valve on the oil-water parallel pipeline, and the oil enters the oil-water-solid separation device 1 after the oil-water enhanced separation until the heat value can not maintain stable combustion.

Example 2

The embodiment provides a high-water-content oil sludge clean combustion treatment device, which comprises an oil-water-solid separation device 1 and a fluidized bed combustion device 2; the oil-water-solid separation device 1 comprises an oil sludge inlet 11 arranged at the upper part, a water-in-oil outlet 12 arranged at the middle upper part, an oil-in-water outlet 13 arranged at the middle lower part and an oil sludge outlet 14 arranged at the bottom; the fluidized bed combustion device 2 comprises an oil inlet 21 arranged at the middle upper part, a mud inlet 22 arranged at the middle lower part, a primary air inlet 23 arranged at the bottom, a secondary air inlet 24 arranged at the middle lower part and positioned below the oil inlet 21, a tertiary air inlet 25 arranged at the middle upper part and positioned above the oil inlet 21, a slag discharge port 26 arranged at the bottom and a flue gas outlet 27 arranged at the top; the water-in-oil outlet 12 is connected with the oil inlet 21 through a water-in-oil conveying pipeline, and the sludge outlet 14 is connected with the sludge inlet 22 through a sludge conveying pipeline;

the treatment device also comprises a gas-solid separator 3 and a heat exchanger 4, wherein the inlet of the gas-solid separator 3 is connected with the flue gas outlet 27, the gas outlet of the gas-solid separator 3 is connected with the heat source inlet of the heat exchanger 4, and the heat source outlet of the heat exchanger 4 is connected with a smoke exhaust pipe;

the fluidized bed combustion device 2 further comprises a material return port 28 arranged at the middle lower part, and the material return port 28 is connected with a solid outlet of the gas-solid separator 3;

the treatment device further comprises an atomizing injector 5, the atomizing injector 5 is arranged outside the fluidized bed combustion device 2, an inlet of the atomizing injector 5 is connected with the oil inlet 21, and an outlet of the atomizing injector 5 is connected with the oil inlet 21; the atomizing injector 5 includes a closed loop pipe 51, and an inlet and 4 nozzles 52 are provided on the closed loop pipe 51;

a centrifugal pump 6 is arranged at one end of the water-in-oil conveying pipeline close to the fluidized bed combustion device 2; a motor 7 and a conveyor 8 are arranged on the oil sludge conveying pipeline; the primary air inlet 23 comprises an air distribution plate; the heat exchanger 4 is a boiler heat exchanger; the gas-solid separator 3 is a cyclone separator.

The treatment device of the embodiment is used for cleaning and burning the high-water-content oil sludge, and can realize final treatment, but the oil-in-water liquid is completely discharged, so that the regulation and control of the temperature of high-temperature flue gas cannot be realized by regulating the amount of the oil-in-water liquid entering the fluidized bed combustion device. For example, in order to achieve full ultimate treatment of oil-in-water liquids, supplemental oil fuel is required to maintain combustion stability.

Example 3

The embodiment provides a high-water-content oil sludge clean combustion treatment device, which comprises an oil-water-solid separation device 1 and a fluidized bed combustion device 2; the oil-water-solid separation device 1 comprises an oil sludge inlet 11 arranged at the upper part, a water-in-oil outlet 12 arranged at the middle upper part, an oil-in-water outlet 13 arranged at the middle lower part and an oil sludge outlet 14 arranged at the bottom; the fluidized bed combustion device 2 comprises an oil inlet 21 arranged at the middle upper part, a mud inlet 22 arranged at the middle lower part, a primary air inlet 23 arranged at the bottom, a secondary air inlet 24 arranged at the middle lower part and positioned below the oil inlet 21, a tertiary air inlet 25 arranged at the middle upper part and positioned above the oil inlet 21, a slag discharge port 26 arranged at the bottom and a flue gas outlet 27 arranged at the top; the water-in-oil outlet 12 is connected with the oil inlet 21 through a water-in-oil conveying pipeline, and the sludge outlet 14 is connected with the sludge inlet 22 through a sludge conveying pipeline;

the treatment device also comprises a gas-solid separator 3 and a heat exchanger 4, wherein the inlet of the gas-solid separator 3 is connected with the flue gas outlet 27, the gas outlet of the gas-solid separator 3 is connected with the heat source inlet of the heat exchanger 4, and the heat source outlet of the heat exchanger 4 is connected with a smoke exhaust pipe;

the oil-in-water outlet 13 is connected with an oil-in-water conveying pipeline, and the water-in-oil conveying pipeline and the oil-in-water conveying pipeline are connected through an oil-water parallel pipeline;

the treatment device further comprises an atomizing injector 5, the atomizing injector 5 is arranged outside the fluidized bed combustion device 2, an inlet of the atomizing injector 5 is connected with the oil inlet 21, and an outlet of the atomizing injector 5 is connected with the oil inlet 21; as shown in fig. 2, the atomizing injector 5 includes a closed-loop pipe 51, and an inlet and 4 nozzles 52 are provided on the closed-loop pipe 51;

a centrifugal pump 6 is arranged at one end of the water-in-oil conveying pipeline close to the fluidized bed combustion device 2; a motor 7 and a conveyor 8 are arranged on the oil sludge conveying pipeline; the primary air inlet 23 comprises an air distribution plate; the heat exchanger 4 is a boiler heat exchanger; the gas-solid separator 3 is a cyclone separator.

Although the treatment device of the embodiment is used for cleaning and burning the high-water-content oil sludge, ultimate treatment can be realized, but large-particle fly ash in the flue gas intercepted by the gas-solid separator 3 is not introduced into the fluidized combustion area of the fluidized bed combustion device 2, so that not only can the heat in the large-particle fly ash not be recovered, but also secondary pollution is caused by directly discharging the large-particle fly ash.

Comparative example 1

This comparative example provides a high water content sludge clean combustion treatment plant, the conditions being exactly the same as in example 1 except that the tertiary air inlet 25 is omitted entirely.

When the treatment apparatus of this comparative example was used to clean and burn high water content sludge, unburned gas and sludge char (mainly generated by pyrolysis and gasification of solid sludge) could not be reburnt and burned out in the region above the oil inlet 21 due to the absence of tertiary air, and the heat energy in the high water content sludge could not be sufficiently recovered.

In summary, the invention provides a high water content oil sludge clean combustion treatment device, which comprises an oil-water-solid separation device and a fluidized bed combustion device, wherein the oil sludge is firstly separated into water-in-oil, oil-in-water and oil sludge through the oil-water-solid separation device, and then the water-in-oil and the oil sludge are subjected to coupled gasification combustion through the fluidized bed combustion device, on one hand, the generated strong reducing volatile component with CO as a main component can effectively inhibit NO in flue gas_xThereby achieving low NO_xOn the other hand, the high-temperature flue gas generated by gasification and combustion can realize heat recovery through the heat exchanger after the flue gas is dedusted and purified. Therefore, the treatment device realizes the final clean combustion treatment and energy recovery of the high-water-content oil sludgeThe method has good energy-saving and emission-reducing effects, can be used for the resource treatment of hazardous wastes, and can exert the advantages of economy, high efficiency and environmental protection.

The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.