CN215112620U - Chemical industry hazardous waste is with useless environmental protection device of treating waste - Google Patents

Abstract

The utility model provides an environmental protection device for treating wastes with wastes against one another for hazardous wastes in chemical industry, include: the system comprises a waste solid feed pretreatment and waste liquid feed system, an incineration system, a waste heat recovery system, a flue gas purification and discharge system and a residue recovery system which are arranged in sequence; the incineration system comprises: the device comprises a rotary burning kiln, a secondary combustion chamber and a combined burner, wherein an outlet of the rotary burning kiln is connected with the secondary combustion chamber through a connecting flue, and the top of the secondary combustion chamber is provided with the combined burner; the waste heat recovery system comprises a waste heat boiler; the flue gas purification and emission system comprises: a quench tower, a semi-dry neutralization tower, a bag-type dust collector, an active coke adsorption tower, a draught fan and a chimney which are connected in sequence. The residue recovery system comprises a cold residue tank, a dissolving tank and a brine tank. The utility model discloses can burn the chemical industry hazardous waste and handle, recycle waste heat, recovery iron, salt etc. reduce treatment cost, reach waste material comprehensive utilization, environmental protection's purpose.

Description

Chemical industry hazardous waste is with useless environmental protection device of treating waste

Technical Field

The utility model relates to a waste treatment technique especially relates to a dangerous wastes against waste of chemical industry environmental protection device.

Background

Enterprises can generate a lot of "garbage" in the production process. Especially in the chemical industry, if the generated waste is not timely and effectively treated, the waste can not only directly harm the health of people, but also seriously pollute the surrounding environment. China is a big country in chemical production, and chemical wastes with different forms and various hazards, such as leftover materials left in the production and utilization processes of chemical raw materials or polluted and non-reusable wastes in the production process, can be generated in the production process of chemical products. They can be divided into solid waste and liquid waste.

Along with the continuous promotion of energy-saving, environment-friendly and low-carbon life concepts, the attention degree to the environment is gradually enhanced. In the past, the problem of pollutant emission generated in chemical production is generally difficult to solve effectively, so that great pollution is brought to the living environment of people. Therefore, the treatment of chemical wastes is a very important subject. At present, the hazardous waste treatment industry is integrally characterized by lower comprehensive utilization level, lower harmless level, difference of different subdivision industries, complex harmless treatment technology, high treatment difficulty, larger cost burden of enterprises, slow development and even great dumping and discarding.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a dangerous useless a great deal of problem of handling existence at present, propose a dangerous wastes material of chemical industry and treat useless environment-friendly device with useless, the device can burn the dangerous wastes material of chemical industry and handle, recycle waste heat, recovery iron, salt etc. reduce treatment cost, reach comprehensive utilization, the purpose of environmental protection of wastes material.

In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides an environmental protection device for hazardous waste in chemical industry treats waste with waste, includes: the system comprises a waste solid feed pretreatment and waste liquid feed system, an incineration system, a waste heat recovery system, a flue gas purification and discharge system and a residue recovery system which are arranged in sequence.

The incineration system comprises: the device comprises a rotary burning kiln, a secondary combustion chamber and a combined burner, wherein an outlet of the rotary burning kiln is connected with the secondary combustion chamber through a connecting flue, and the top of the secondary combustion chamber is provided with the combined burner; the second combustion chamber is provided with an explosion-proof door; the waste heat recovery system comprises: a waste heat boiler; the flue gas purification and emission system comprises: a quench tower, a semi-dry neutralization tower, a bag-type dust collector, an active coke adsorption tower, a draught fan and a chimney which are connected in sequence.

Further, the solid feed pretreatment of waste and waste liquid charge-in system includes: the device comprises a crusher, a rotary screen, an oversize material belt conveyor, an undersize material belt conveyor, a first belt conveyor, a second belt conveyor, a receiving hopper and a hydraulic pusher; the crusher outlet is connected with the rotary screen inlet through a first belt conveyor, the rotary screen oversize product outlet is connected with the crusher inlet through an oversize product belt conveyor, the rotary screen undersize product outlet is connected with the receiving hopper through an undersize product belt conveyor, and the bottom outlet of the receiving hopper is connected with the hydraulic pusher; the waste solid feeding pretreatment and waste liquid feeding system further comprises a waste liquid buffer tank and a waste liquid booster pump, wherein the waste liquid buffer tank is connected with a waste liquid atomizing spray gun in the combined type combustor through the waste liquid booster pump.

Further, the debris retrieval system includes: the slag cooling tank is positioned at the lower part of a discharge port at the tail of the rotary incineration kiln, the dissolving tank is positioned at the lower part of the secondary combustion chamber, and the dissolving tank is communicated with the brine tank through a circulating pump. And molten salt after incineration in the secondary combustion chamber falls into a dissolving tank arranged at the lower part of the secondary combustion chamber through a salt outlet, and the dissolved salt water flows into a salt water tank which is positioned at the lower part of an exhaust-heat boiler, a quench tower and a semi-dry neutralization tower ash bucket.

And further, the brine tank is provided with a stirrer, the dissolved low-temperature brine is sent into the dissolving tank again through a brine circulating pump to continuously reduce the temperature and dissolve the burned inorganic salt, and the brine is sent to a next procedure outside the battery limits for separation treatment after reaching the required concentration.

Furthermore, the combined burner is arranged at the top of the second combustion chamber and comprises a natural gas nozzle, a waste liquid atomization spray gun, an ultraviolet explosion-proof flame detector and an ignition gun.

Furthermore, the furnace body of the rotary incineration kiln is a cylindrical roller made of refractory bricks or refractory castable and is arranged in a slightly inclined manner; the kiln head of the rotary incineration kiln is provided with an annular air inlet device, an independent fan is arranged to control the air quantity required by waste solid incineration, and the kiln head is provided with a starting natural gas burner.

Furthermore, a discharge port is arranged at the tail of the rotary incineration kiln, a slag cooling groove is arranged at the lower part of the discharge port, the iron slag incinerated by the rotary incineration kiln is collected, the iron slag discharged from the rotary incineration kiln enters the slag cooling groove, circulating cooling water is introduced into the slag cooling groove, and the iron slag is cooled to be below 80 ℃.

Further, the bottom of the furnace chamber of the secondary combustion chamber is provided with a molten salt overflow port, a dissolving tank is arranged below the molten salt overflow port, and the dissolving tank is connected with a brine tank through a brine circulating pump.

Furthermore, the waste heat boiler adopts an all-welded membrane type water-cooled wall structure and is manufactured by welding a pipe and flat steel, so that the tightness of the hearth under any operation working condition is ensured. In order to fully recover the flue gas waste heat, a water-cooling screen is arranged in the waste heat boiler and is suspended on a steel frame through a suspension rod at the upper part of an upper header; and a plurality of layers of rigid beams with enough strength are arranged on the periphery of the waste heat boiler from top to bottom, so that the hearth has enough anti-external explosion and anti-internal explosion capability. The water-cooled wall is also provided with a necessary observation hole, a thermal measurement hole, a manhole and an ash blowing hole.

Furthermore, the waste heat recovery system also comprises a boiler feed water pump, a soft water tank, a steam distributing cylinder and a combustion air heat exchanger. And the boiler feed water pump sends soft water into the waste heat boiler steam drum from the soft water tank. Steam generated by the waste heat boiler enters the combustion-supporting air heat exchanger through the steam distributing cylinder, and exchanges heat with combustion-supporting air of the secondary combustion chamber in the combustion-supporting air heat exchanger, so that the temperature of the combustion-supporting air is increased, the consumption of combustion-supporting fuel is reduced, and the cost is saved.

Furthermore, a multi-point steam soot blower is arranged in the waste heat boiler cooling chamber, so that molten salt in waste liquid is prevented from being adhered to a water-cooled wall of the waste heat boiler.

Further, flue gas purification discharge system still includes urea solution storage tank, urea solution preparation case, urea solution spray pump, urea solution delivery pump, static mixer etc. urea solution preparation case sends into urea solution storage tank through urea solution delivery pump, mixes back at exhaust-heat boiler flue gas entrance point through SNCR denitration atomizing spray gun by urea solution spray pump through static mixer and gets into exhaust-heat boiler, carries out nitrogen oxide's desorption to burning the system. The SNCR denitration atomizing spray gun is arranged on a heating surface of the waste heat boiler with the temperature of 1100-850 ℃.

Further, the flue gas purification and discharge system also comprises a quenching water pump and a quenching spray gun; the rapid cooling spray gun is arranged on the shoulder of the rapid cooling tower, and the rapid cooling water pump sends the rapid cooling water into the rapid cooling spray gun to be sprayed into the rapid cooling tower, so that the temperature of the flue gas is reduced from about 550 ℃ to about 180 ℃ in 1s, and the generation of dioxin is avoided.

Furthermore, a quenching temperature measuring point is arranged on a flue at the outlet of the quenching tower and is interlocked with a quenching water pump so as to control the temperature of the flue gas at the outlet of the quenching tower.

Furthermore, the semi-dry neutralization tower is divided into a left chamber and a right chamber by a vertically arranged partition plate, the bottoms of the left chamber and the right chamber are communicated, a dust hopper is arranged at the bottom of the semi-dry neutralization tower, the lower edge of the partition plate in the semi-dry neutralization tower extends to the dust hopper 1/2-1/3, and the whole neutralization tower is formed into a large Venturi type by the built-in partition plate of the semi-dry neutralization tower; ensuring that the acid gas in the flue gas is fully neutralized with alkali liquor so as to achieve the aim of deacidification.

Furthermore, the flue gas purification and discharge system also comprises an alkali liquor spraying pump and a steam type double-fluid alkali liquor atomization spray gun. The steam type double-fluid alkali liquor atomization spray gun is arranged at a flue gas inlet of the semi-dry method neutralization tower, and alkali liquor is sprayed into the semi-dry method neutralization tower from the steam type double-fluid alkali liquor atomization spray gun through an alkali liquor spraying pump to remove acid gas from flue gas.

Furthermore, a connecting flue of the semi-dry neutralization tower and the bag-type dust remover is provided with a nozzle of an activated carbon injection device and a nozzle of a slaked lime injection device.

Furthermore, the bag-type dust collector adopts a chamber structure form of online detection and online bag replacement, and can replace a damaged bag without stopping a furnace.

Furthermore, a through bypass is arranged between the inlet flue and the outlet flue of the active coke adsorption tower. When the activated coke needs to be replaced, the bypass is opened, and the incineration system can carry out replacement operation without stopping the furnace.

A treatment method for treating chemical hazardous waste by using waste comprises the following steps: crushing the waste solids in a waste solid feed pretreatment system, pushing the crushed waste solids with proper size into a rotary incineration kiln for incineration, and feeding the incinerated flue gas into a secondary combustion chamber; the waste liquid enters a secondary combustion chamber through a waste liquid atomizing spray gun of the combined burner, and is incinerated in a hearth together with waste solid incineration flue gas, the generated high-temperature flue gas enters a waste heat recovery system for heat exchange, and the flue gas after heat exchange is purified by a flue gas purification system and then is discharged into the atmosphere; and the generated iron, salt and the like enter a residue recovery system for collection and treatment.

The utility model discloses hazardous waste of chemical industry is with useless environmental protection device that handles waste has following advantage compared with prior art:

solid feed pretreatment and waste liquid feed system of waste

1) The treated waste solids contain an iron bucket (with the diameter of 0.6 meter and the height of 0.9 meter) and a plastic bucket (with the diameter of 0.587 meter and the height of 0.93 meter), and the iron bucket and the plastic bucket are crushed by a crusher;

2) and conveying the crushed strip-shaped and blocky waste materials into a drum screen by a belt conveyor for screening. Returning the crushed waste with the size of more than 30-50mm to the crusher through an oversize material belt conveyor for secondary crushing; other waste solids (such as woven bags, ton bags and the like) are also conveyed into a crusher together with the waste materials with the size of more than 30-50mm after being sieved by an oversize material belt conveyor;

3) after being screened by a drum screen, the waste materials with the particle size of less than 30-50mm and small particle waste materials (such as activated carbon and the like) enter a belt conveyor for undersize materials, are sent into a receiving hopper of a rotary incineration kiln, and are pushed into the rotary incineration kiln by a hydraulic pusher for incineration;

4) the crushing, screening and conveying adopt a full-sealed design, so that the generation of raised dust in the crushing and conveying process is avoided;

5) the material pushing speed is adjusted according to the incineration requirement, so that enough waste materials are continuously and uniformly fed into the rotary incineration kiln, and no material blockage or material sealing is generated;

6) after the waste liquid enters a waste liquid buffer tank to stabilize the pressure and flow, the waste liquid is conveyed to a waste liquid atomizing spray gun in a combined burner at the top of a secondary combustion chamber through a waste liquid booster pump;

second, burn system

7) The rotary type incineration kiln body adopts a cylindrical roller made of refractory bricks (or refractory castable) and is arranged in a slightly inclined manner, the whole body of the kiln body is pushed to rotate by a motor, the rotating speed can be adjusted steplessly according to the incineration quantity and the incineration requirement, and the waste solid incineration requirement is fully met;

8) the rotary incineration kiln head is provided with an annular air inlet device, an independent fan is arranged to control the air quantity required by waste solid incineration, and the kiln head is provided with a starting natural gas burner;

9) flue gas generated after the waste solid incineration enters a secondary combustion chamber for secondary high-temperature incineration;

10) the waste liquid is conveyed to a waste liquid atomizing spray gun in a combined burner positioned at the top of the secondary combustion chamber through a waste liquid booster pump, and low-pressure steam (or compressed air) is introduced into the waste liquid atomizing spray gun to atomize the waste liquid and then spray the atomized waste liquid into the secondary combustion chamber for incineration;

third, waste heat recovery system

11) The flue gas enters a waste heat boiler to recover the waste heat of the flue gas. The salt carried by the flue gas is bonded on the membrane wall and the water-cooling screen, meanwhile, low-temperature steam water flows through the membrane wall and the water-cooling screen, at the contact surface of the salt with the membrane wall and the water-cooling screen, the heat carried by the salt is quickly taken away, so that a brittle membrane is formed at the contact surface, the weight is increased along with the increase of the salt bonded on the surface of the membrane, and the salt can automatically fall off under the action of gravity;

12) the steam soot blower is arranged in the cooling chamber of the waste heat boiler, and wall-hanging salts can be easily blown down by blowing due to the existence of the brittle film;

13) an SNCR denitration spray gun is arranged at the smoke inlet end of the waste heat boiler at the temperature of 850-1100 ℃. The ammonia-containing reducing agent (such as urea solution) is sprayed into the furnace by entering an SNCR denitration spray gun through a spray pump, and NOx in the flue gas is reduced and removed to generate nitrogen and water.

Fourth, flue gas purification discharge system

14) The plastic component to be incinerated contains chlorine, and a quenching tower is provided. The flue gas with the temperature of about 550 ℃ coming out of the waste heat boiler enters a quenching tower to be mixed with the sprayed quenching water, the temperature of the flue gas is rapidly reduced to about 180 ℃ in the time of <1s, and the generation of dioxin-like substances is restrained. A quenching temperature measuring point is arranged on the outlet flue of the quenching tower;

15) a semi-dry neutralization tower is arranged after the quenching tower. The prepared sodium hydroxide alkali liquor (the pH value is 10-12) is atomized into particles by a steam type double-fluid alkali liquor atomizing spray gun through an alkali liquor delivery pump, and the particles are fully mixed with the flue gas in the semi-dry type neutralization tower under the action of a cyclone device, and are subjected to neutralization reaction with the acid-containing flue gas to remove the acid gas in the flue gas;

16) the semi-dry method is adopted for neutralization, the neutralization effect is good, and no waste water is generated in the whole process;

17) the semi-dry neutralization tower is divided into a left chamber and a right chamber by a vertically arranged partition plate, the bottoms of the left chamber and the right chamber are communicated, an ash bucket is arranged at the bottom of the semi-dry neutralization tower, the lower edge of the partition plate in the semi-dry neutralization tower extends to the ash bucket 1/2-1/3, and the whole neutralization tower forms a large Venturi type by the built-in partition plate in the semi-dry neutralization tower; ensuring that acid gas in the flue gas is sufficiently neutralized with alkali liquor so as to achieve the aim of deacidification;

18) the whole semi-dry neutralization tower forms a U-shaped structure by the mode of a partition board arranged in the semi-dry neutralization tower, so that the retention time of the flue gas in the semi-dry neutralization tower is prolonged, the volume of the semi-dry neutralization tower is effectively reduced, and meanwhile, sufficient neutralization reaction time is provided for deacidification in the semi-dry process;

19) an activated carbon spraying device nozzle and a slaked lime spraying device nozzle are arranged in a connecting flue of a semi-dry neutralization tower and a bag-type dust remover, and activated carbon powder and slaked lime powder are sprayed into flue gas so as to prevent the resynthesis of incineration flue gas in the purification process and ensure that no dioxin generating environment exists;

20) the bag-type dust collector is provided with a chamber structure form which is used for detecting on line and replacing the bag on line, namely, when the bag is damaged, the chamber where the damaged bag is located can be detected on line, and the damaged bag is replaced without stopping the furnace;

21) an active coke adsorption tower is arranged behind the bag-type dust collector, the flue gas is fully contacted with the active coke, and toxic and harmful substances such as dioxins, heavy metals, hydrogen chloride, carbon monoxide, sulfur dioxide, nitrogen oxides, smoke dust and the like in the flue gas are further removed by utilizing the characteristics of large specific surface area and strong adsorption capacity of the active coke;

22) a straight-through bypass is arranged between an inlet flue and an outlet flue of the active coke adsorption tower, and when the active coke device has problems, namely the active coke is replaced or special conditions such as overhigh inlet flue gas temperature and the like occur, a bypass valve is opened, so that the flue gas directly enters a chimney to be discharged without passing through the active coke adsorption tower.

Fifth, residue recovery system

23) The rotary incineration kiln is provided with a discharge port at the tail, a slag cooling groove is arranged at the lower part, and the iron slag burned by the rotary incineration kiln is collected. And (3) feeding the iron slag discharged from the rotary incineration kiln into a slag cooling tank, and introducing cooling water into the slag cooling tank to cool the iron slag to below 80 ℃.

24) And after the second combustion chamber burns, the molten salt falls into a dissolving tank arranged at the lower part through a molten salt overflow port, fresh water and circulating brine are introduced into the dissolving tank, the molten salt is cooled and dissolved, the temperature of the brine is not higher than 60 ℃ by adjusting the water amounts of the fresh water and the circulating brine, and the salt is ensured to be completely dissolved. The dissolved brine flows into a brine tank. And solid salt coming out of the lower parts of the waste heat boiler, the quench tower and the semi-dry neutralization tower enters a brine pool.

25) The mixer is arranged in the brine pool, the dissolved low-temperature brine is sent into the dissolving tank again through the brine circulating pump to continuously dissolve the burned inorganic salt, and the brine is sent to the next procedure outside the battery limits for separation treatment after reaching the required concentration.

Drawings

FIG. 1 is a schematic structural diagram of an environmental protection device for treating wastes with wastes in chemical hazardous wastes.

Detailed Description

The invention is further illustrated below with reference to the following examples:

example 1

The embodiment discloses chemical industry hazardous waste is with useless environmental protection device of treating waste, as shown in fig. 1, includes: the system comprises a waste solid feed pretreatment and waste liquid feed system, an incineration system, a waste heat recovery system, a flue gas purification and discharge system and a residue recovery system which are arranged in sequence.

The solid feed pretreatment of useless and waste liquid charge-in system includes: the device comprises a crusher 1, a rotary screen 4, an oversize belt conveyor 2, an undersize belt conveyor 6, a first belt conveyor 3, a second belt conveyor 5, a receiving hopper 7 and a hydraulic pusher 8; an outlet of the crusher 1 is connected with an inlet of a rotary screen 4 through a first belt conveyor 3, an oversize outlet of the rotary screen 4 is connected with the inlet of the crusher 1 through an oversize belt conveyor 2, an undersize outlet of the rotary screen 4 is connected with a receiving hopper 7 through an undersize belt conveyor 6, and an outlet at the bottom of the receiving hopper 7 is connected with a hydraulic pusher 8; the waste solid feed pretreatment and waste liquid feed system further comprises a waste liquid buffer tank and a waste liquid booster pump, wherein the waste liquid buffer tank is connected with a waste liquid atomizing spray gun in the combined type combustor 12 through the waste liquid booster pump.

The incineration system comprises: the incinerator comprises a rotary incineration kiln 9, a secondary combustion chamber 14 and a combined burner 12, wherein an outlet of the rotary incineration kiln 9 is connected with the secondary combustion chamber 14 through a connecting flue 11, and the top of the secondary combustion chamber 14 is provided with the combined burner 12;

the furnace body of the rotary incineration kiln 9 is a cylindrical roller made of refractory bricks (or refractory castable) and is slightly inclined; the kiln head of the rotary incineration kiln is provided with an annular air inlet device, an independent fan is arranged to control the air quantity required by waste solid incineration, and the kiln head is provided with a starting burner.

The combined burner 12 is arranged at the top of the second combustion chamber 14 and comprises a natural gas nozzle, a waste liquid atomization spray gun, an ultraviolet explosion-proof flame detector and an ignition gun.

The waste heat recovery system comprises: a waste heat boiler 16; the waste heat boiler 16 adopts an all-welded membrane type water-cooled wall structure and is made by welding a pipe and flat steel so as to ensure the tightness of a hearth under any operating condition. In order to fully recover the flue gas waste heat, a water-cooling screen is arranged in the waste heat boiler 16 and is suspended on a steel frame through a suspension rod at the upper part of the upper header; and a plurality of layers of rigid beams with enough strength are arranged on the periphery of the waste heat boiler 16 from top to bottom, so that the hearth has enough anti-external explosion and anti-internal explosion capability. The water-cooled wall is also provided with a necessary observation hole, a thermal measurement hole, a manhole and an ash blowing hole.

The waste heat recovery system further comprises a boiler feed water pump, a soft water tank, a steam distributing cylinder and a combustion air heat exchanger. And the boiler feed water pump sends soft water into the waste heat boiler steam drum from the soft water tank. Steam generated by the waste heat boiler 16 enters the combustion-supporting air heat exchanger through the steam distributing cylinder, and exchanges heat with combustion-supporting air of the second combustion chamber in the combustion-supporting air heat exchanger.

And a multipoint steam soot blower is arranged in the cooling chamber of the waste heat boiler 16, so that molten salt in waste liquid is prevented from being bonded on a water-cooled wall of the waste heat boiler.

The flue gas purification and emission system comprises: a quenching tower 17, a semi-dry process neutralization tower 19, a bag-type dust remover 20, an active coke adsorption tower 21, an induced draft fan 22 and a chimney 23 which are connected in sequence.

Flue gas purification discharge system still includes urea solution storage tank, urea solution and prepares case, urea solution spray pump, urea solution delivery pump, static mixer, urea solution prepares the case and sends into urea solution storage tank through urea solution delivery pump, mixes the back at exhaust-heat boiler flue gas entrance point through SNCR denitration atomizing spray gun and gets into exhaust-heat boiler by urea solution spray pump through static mixer, carries out the desorption of nitrogen oxide to burning the system. The SNCR denitration atomizing spray gun is arranged on a heating surface of the waste heat boiler with the temperature of 1100-850 ℃.

The flue gas purification and discharge system also comprises a quenching water pump and a quenching spray gun; the rapid cooling spray gun is arranged on the shoulder part of the rapid cooling tower 17, and the rapid cooling water pump sends the rapid cooling water into the rapid cooling spray gun to be sprayed into the rapid cooling tower, so that the temperature of the flue gas is reduced from 550 ℃ to 180 ℃ in 1s, and the generation of dioxin is avoided.

A quenching temperature measuring point 18 is arranged on a flue at the outlet of the quenching tower 17, and the temperature measuring point 18 is interlocked with a quenching water pump so as to control the temperature of the flue gas at the outlet of the quenching tower.

The semi-dry neutralization tower 19 is divided into a left chamber and a right chamber by a vertically arranged partition plate, the bottoms of the left chamber and the right chamber are communicated, the bottom of the semi-dry neutralization tower 19 is provided with an ash bucket, the lower edge of the partition plate in the semi-dry neutralization tower 19 extends to the ash bucket 1/2-1/3, and the whole neutralization tower is formed into a large Venturi type by the built-in partition plate in the semi-dry neutralization tower 19; ensuring that the acid gas in the flue gas is fully neutralized with alkali liquor so as to achieve the aim of deacidification.

The flue gas purification and discharge system further comprises an alkali liquor spraying pump and a steam type double-fluid alkali liquor atomization spray gun. The steam type double-fluid alkali liquor atomization spray gun is arranged at a flue gas inlet of the semi-dry method neutralization tower, and alkali liquor is sprayed into the semi-dry method neutralization tower from the steam type double-fluid alkali liquor atomization spray gun through an alkali liquor spraying pump to remove acid gas from flue gas.

And a connecting flue of the semi-dry neutralization tower 19 and the bag-type dust collector 20 is provided with a nozzle of an activated carbon injection device and a nozzle of a slaked lime injection device. Active carbon powder and slaked lime powder are sprayed into the flue gas to inhibit the re-synthesis of the incineration flue gas in the purification process, and the existence of no dioxin generation environment is ensured.

The bag-type dust collector 20 adopts a chamber-divided structure form of online detection and online bag replacement, and can replace damaged bags without stopping the furnace.

Furthermore, a through bypass is arranged between the inlet flue and the outlet flue of the active coke adsorption tower 21. When the activated coke needs to be replaced, the bypass is opened, and the incineration system can replace the activated coke without stopping the furnace.

The debris recovery system includes: a cold slag tank 10, a dissolving tank 15 and a brine tank 24.

The slag cooling groove 10 is positioned at the lower part of a discharge port at the tail of the rotary incineration kiln 9 and used for collecting iron slag incinerated by the rotary incineration kiln 9. The iron slag from the rotary burning kiln 9 enters a slag cooling groove 10, and circulating cooling water is introduced into the slag cooling groove to cool the iron slag to below 80 ℃.

The dissolving tank 15 is positioned below a fused salt overflow port at the bottom of a hearth of the secondary combustion chamber 14. The molten liquid salt burned in the second combustion chamber flows into the dissolving tank 15, and the dissolving tank 15 is connected with the brine pool 24 through a brine circulating pump.

The brine pond 24 is positioned below the ash bucket of the waste heat boiler 16, the ash bucket of the quench tower 17 and the ash bucket of the semi-dry neutralization tower 19.

The chemical hazardous waste treatment method using waste to treat waste comprises the following steps:

manually feeding large iron buckets and plastic buckets in waste solids to a crusher 1 for crushing, feeding the crushed strip-shaped waste materials into a drum screen 4 by a first belt conveyor 3 for screening, and feeding the waste materials larger than 30-50mm back to the crusher 1 for secondary crushing by an oversize material belt conveyor 2; other waste solids (such as woven bags, ton bags and the like) are also conveyed into the crusher 1 through the oversize material belt conveyor 2 together with the crushed waste materials with the thickness of more than 30-50 mm. The waste materials with the particle size of less than 30-50mm after being screened and all the active carbon and the like enter a belt conveyor 6 for undersize materials, are sent into a receiving hopper 7 of the rotary incineration kiln, and are pushed into the rotary incineration kiln by a hydraulic pusher 8 for incineration. The material pushing speed can be adjusted according to the incineration requirement, and sufficient waste materials can be continuously and uniformly fed, and material blockage and material sealing are avoided.

The solid waste is fed to a rotary incineration kiln 9 for incineration. The rotary burning kiln body is a cylindrical roller made of refractory bricks (or castable) and slightly inclined, the whole body of the kiln body is pushed to rotate by a motor, the rotating speed can be adjusted steplessly according to the burning quantity and burning requirements, and the waste solid burning requirements are fully met. The kiln head is provided with an annular air inlet device, an independent fan is arranged to control the air quantity required by waste solid incineration, and the kiln head is provided with a starting burner.

Because the waste solid heat value is higher, the auxiliary fuel in the rotary incineration kiln 9 is only used as a pilot burner and used when the furnace is started. The burning temperature in the kiln is controlled at about 1200 ℃, and the generated flue gas enters the secondary combustion chamber 14.

Waste liquid from outside the battery limits is conveyed to a waste liquid buffer tank in the battery limits, is conveyed to a waste liquid atomizing spray gun in the combined burner 12 at the top of the secondary combustion chamber 14 through a waste liquid booster pump after stabilizing pressure and flow, and simultaneously is injected into the waste liquid atomizing spray gun to atomize the waste liquid and then is sprayed into the secondary combustion chamber 14 for incineration.

The combined burner 12 is equipped with an ultraviolet explosion-proof flame detector, an ignition gun, and the like. The working elasticity is wide, and the operation is stable; the flame combustion is stable, the fullness is good, and the combustion efficiency is high; the operation is simple, convenient and safe, the advanced level of similar equipment at home and abroad is achieved, the stable operation of the whole device is ensured, and measuring instruments, anticorrosive materials and the like on the furnace body meet the requirements of relevant design specifications. The burner nozzle is made of a special alloy material with high temperature resistance and corrosion resistance. The head of the waste liquid atomization spray gun is made of hastelloy.

The temperature in the secondary combustion chamber 14 is more than or equal to 1100 ℃ by adjusting the consumption of natural gas and combustion-supporting air in the secondary combustion chamber. The residence time of the high-temperature flue gas in the secondary chamber is more than 2 s.

The high-temperature flue gas with the temperature of about 1100 ℃ enters the waste heat boiler 16 from the lower part of the secondary combustion chamber 14. The waste heat boiler furnace adopts an all-welded membrane type water-cooled wall structure and is formed by welding a pipe and flat steel so as to ensure the tightness of the furnace under any operating condition. In order to fully recover the flue gas waste heat, a water-cooling screen is arranged in the waste heat boiler and is suspended on the steel frame through a suspender on the upper part of the upper header. The periphery of the waste heat boiler is provided with a plurality of layers of rigid beams with enough strength from top to bottom, so that the hearth has enough anti-external explosion and anti-internal explosion capability. The water-cooled wall is also provided with necessary observation holes, thermotechnical measuring holes, manholes, ash blowing holes and the like.

And a drain valve is arranged on the lower header of each heating surface so as to regularly drain the sewage.

The non-clogging feature of the waste heat boiler 16 is explained as follows: the salt that the flue gas carried bonds on membrane wall and water-cooling screen, and low temperature soda is walked to membrane wall and water-cooling screen inside simultaneously, and at the interface department of salt with membrane wall and water-cooling screen, the heat that the salt carried is taken away fast and thus forms the fragile membrane of one deck here, and the salt that bonds along with the membrane surface increases weight also increasing, can drop by oneself under the effect of gravity. Meanwhile, the multipoint steam soot blower is arranged in the cooling chamber of the waste heat boiler 16, and wall-hanging salts can be easily blown down through blowing due to the existence of the brittle film, so that the waste heat boiler can be prevented from being blocked, and the high heat transfer efficiency of the waste heat boiler can be maintained.

The steam quality is improved by arranging a steam-homogenizing pore plate, a slit type steam-water separator, a jet type water supply distribution pipe and a blow-off pipe in the steam pocket, and the water content of the steam in the boiler can be less than 1%. The liquid level meter and the balance container interface are arranged on the steam pocket, and each interface can be connected with an overtemperature and overpressure alarm device and a linkage, a remote water level display device, a high-low water level alarm, a low-low water level linkage and other users according to the actual conditions to arrange the liquid level meter, so that the safe and reliable operation of the boiler is ensured.

Considering that the waste solids contain a small amount of fuel type nitrogen, in order to meet the requirement of environmental protection and standard emission, the system is provided with an SNCR denitration spray gun at the position of 850-1100 ℃ of the inlet end temperature of the waste heat boiler 16. The ammonia-containing reducing agent (such as urea solution) is sprayed into the furnace by entering an SNCR denitration spray gun through a spray pump, and NOx in the flue gas is reduced and removed to generate nitrogen and water.

Since the plastic component contains chlorine, the system is provided with a quenching tower 17. The flue gas with the temperature of about 550 ℃ from the waste heat boiler 16 enters a quenching tower 17 to be mixed with the injected quenching water, the temperature of the flue gas is rapidly reduced to 180 ℃ within the time of <1s, and the generation of dioxin-like substances is restrained. The quenching water comes from a quenching water tank, and the quenching water is sprayed into a quenching tower by a quenching atomization spray gun through a quenching water pump to be mixed with the flue gas.

In the scheme, a semi-dry neutralization tower 19 is arranged behind the quenching tower. The prepared sodium hydroxide alkaline liquor (with the pH value of 10-12) is atomized into particles by a steam type two-fluid atomization spray gun through an alkaline liquor infusion pump, and the particles are fully mixed with the flue gas in the semi-dry type neutralization tower 19 under the action of a cyclone device, and are subjected to neutralization reaction with the acid-containing flue gas, so that the acid gas in the flue gas is removed. The semi-dry method is adopted for neutralization, the neutralization effect is good, and no waste water is generated in the whole process.

An activated carbon spraying device nozzle and a slaked lime spraying device nozzle are arranged in a connecting flue of the semi-dry neutralization tower 19 and the bag-type dust collector 20, activated carbon powder and slaked lime powder are sprayed into flue gas, the resynthesis of incineration flue gas in the purification process is restrained, and the existence of no dioxin generation environment is ensured. The flue gas then enters the bag-type dust collector 20.

The bag-type dust collector 20 adopts a chamber structure form of online detection and online bag replacement, namely, when the bag is damaged, the chamber in which the damaged bag is located can be detected online, and the damaged bag can be replaced without stopping the furnace. Part of solid salt particles, activated carbon powder and quicklime powder carried in the flue gas are separated in the bag-type dust remover, and the lower part of the ash hopper of the bag-type dust remover 20 is collected in a vibration mode and the like. The partial salts mixed with slaked lime and activated carbon powder can be sent to a rotary burning kiln for burning so as to eliminate the activated carbon powder and dioxin.

The flue gas after deacidification and dust removal enters an active coke adsorption tower 21, the flue gas is fully contacted with active coke, and toxic and harmful substances such as dioxins, heavy metals, hydrogen chloride, carbon monoxide, sulfur dioxide, nitrogen oxides, smoke dust and the like in the flue gas are further removed by utilizing the characteristics of large specific surface area and strong adsorption capacity of the active coke.

A straight-through bypass is arranged between the inlet flue and the outlet flue of the active coke adsorption tower 21, and when the active coke device has problems, namely the active coke is replaced or special conditions such as overhigh inlet flue gas temperature and the like occur, a bypass valve is opened, so that the flue gas is not directly discharged through the active coke adsorption tower.

The clean flue gas from the active coke adsorption tower 21 is sent to a chimney 23 by a draught fan 22 and is discharged into the atmosphere.

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; although the present invention has been described in detail with reference to the foregoing embodiments, it should 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; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (9)

1. The utility model provides a hazardous waste of chemical industry handles useless environment-friendly device with useless, its characterized in that includes: the system comprises a waste solid feed pretreatment and waste liquid feed system, an incineration system, a waste heat recovery system, a flue gas purification and discharge system and a residue recovery system which are arranged in sequence;

the incineration system comprises: the incinerator comprises a rotary incineration kiln (9), a secondary combustion chamber (14) and a combined burner (12), wherein an outlet of the rotary incineration kiln (9) is connected with the secondary combustion chamber (14) through a connecting flue (11), and the top of the secondary combustion chamber (14) is provided with the combined burner (12); the secondary combustion chamber (14) is provided with an explosion-proof door (13); the waste heat recovery system comprises a waste heat boiler (16); the flue gas purification and emission system comprises: a quench tower (17), a semi-dry neutralization tower (19), a bag-type dust remover (20), an active coke adsorption tower (21), an induced draft fan (22) and a chimney (23) which are connected in sequence.

2. The environmental protection device for hazardous chemical waste disposal with waste according to claim 1, wherein the waste solid feed pretreatment and waste liquid feed system comprises: the device comprises a crusher (1), a rotary screen (4), an oversize belt conveyor (2), an undersize belt conveyor (6), a first belt conveyor (3), a second belt conveyor (5), a receiving hopper (7) and a hydraulic pusher (8); an outlet of the crusher (1) is connected with an inlet of a rotary screen (4) through a first belt conveyor (3), an oversize outlet of the rotary screen (4) is connected with an inlet of the crusher (1) through an oversize belt conveyor (2), an undersize outlet of the rotary screen (4) is connected with a receiving hopper (7) through an undersize belt conveyor (6), and an outlet at the bottom of the receiving hopper (7) is connected with a hydraulic pusher (8); the waste solid feeding pretreatment and waste liquid feeding system further comprises a waste liquid buffer tank and a waste liquid booster pump, wherein the waste liquid buffer tank is connected with a waste liquid atomizing spray gun in the combined type combustor (12) through the waste liquid booster pump.

3. The chemical hazardous waste treatment by waste environmental protection device according to claim 1 or 2, wherein the residue recovery system comprises: the slag cooler comprises a cold slag groove (10) for recycling iron slag, a dissolving groove (15) for recycling salt and a brine pond (24), wherein the cold slag groove (10) is positioned at the lower part of a kiln tail discharge hole of a rotary incineration kiln (9), the dissolving groove (15) is positioned at the lower part of a secondary combustion chamber (14), and the dissolving groove (15) is communicated with the brine pond (24) through a circulating pump.

4. The environmental protection device for hazardous waste treatment by chemical industry according to claim 1, wherein the furnace body of the rotary incinerator (9) is a cylindrical drum made of refractory bricks or refractory castable, and is arranged in a slightly inclined way; the kiln head of the rotary incineration kiln is provided with an annular air inlet device which is provided with an independent fan; and a kiln head of the rotary incineration kiln is provided with a starting natural gas burner.

5. The environmental protection device for hazardous waste in chemical industry according to claim 1, wherein the waste heat boiler (16) adopts an all-welded membrane water-cooled wall structure and is made by welding pipes and flat steel; a water-cooling screen is arranged in the waste heat boiler (16), and the water-cooling screen is suspended on a steel frame through a hanger rod at the upper part of the upper header.

6. The environmental protection device for treating chemical hazardous waste with waste according to claim 5, wherein the flue gas inlet end of the exhaust-heat boiler (16) is provided with an SNCR denitration nozzle on a heating surface with the temperature of 1100-850 ℃.

7. The environmental protection device for hazardous waste control by chemical industry according to claim 1, wherein the semi-dry neutralization tower (19) is divided into a left chamber and a right chamber by a vertically arranged partition, the bottoms of the left chamber and the right chamber are communicated, the bottom of the semi-dry neutralization tower (19) is provided with an ash bucket, the lower edge of the partition in the semi-dry neutralization tower (19) extends to the ash bucket 1/2-1/3, and the whole neutralization tower is formed into a large venturi type by the partition arranged in the semi-dry neutralization tower (19).

8. The environmental protection device for hazardous waste in chemical industry according to claim 1, wherein the flue connecting the semi-dry neutralization tower (19) and the bag-type dust remover (20) is provided with a nozzle of an activated carbon injection device and a nozzle of a slaked lime injection device.

9. The environmental protection device for hazardous waste in chemical industry to treat waste with waste according to claim 8, wherein the bag-type dust collector (20) adopts a chamber-divided structure form of online detection and online bag replacement.

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