A system for environmental protection treatment and resource utilization of fine chemical reactor residues

Abstract

A fine chemical kettle residue environmental protection treatment and resource utilization system belongs to the field of environmental protection and waste resource utilization. In the system, the discharge port of the elevator is opposite to the feed port of the silo, and a feeder is arranged below the discharge port of the silo. The feeder is connected to the adiabatic incinerator through a feed pipe. The top of the adiabatic incinerator is connected to the membrane wall waste heat boiler through a flue, and the lower part of the membrane wall waste heat boiler is connected to the quenching tower through a pipeline. The lower part of the quenching tower is connected to the bag filter through a pipeline, and the upper part of the bag filter is connected to the lower part of the deacidification spray tower through a pipeline. The top of the deacidification spray tower is connected to the chimney through a pipeline. The system performs harmless and reduced environmental protection treatment on solid kettle residue and realizes resource treatment of solid kettle residue. It also recovers the heat energy generated by its incineration and the salts in the kettle residue, which not only realizes the emission requirements of solid kettle residue environmental protection treatment, but also realizes the requirements of waste resource utilization, which is conducive to the harmonious unity of enterprise development and environmental protection.

Description

Technical Field

[0001] The invention belongs to the field of environmental protection, energy saving and waste resource utilization, and specifically relates to a fine chemical kettle residue environmental protection treatment and resource utilization system. Background Art

[0002] With the rapid development of the national economy, the chemical, pharmaceutical, pesticide, building materials, papermaking, printing and dyeing industries have developed very rapidly. The types and quantities of chemicals are increasing day by day, and the scale of production equipment is also expanding. The chemical industry is related to all aspects of life. All kinds of items we use are produced by the chemical industry. With the increasing scarcity of water resources, the increasingly severe environmental problems and the increasing environmental protection requirements, the call for the development of external wastewater reuse and zero emission technology is getting louder and louder. In order to reduce the environmental protection management costs of enterprises and realize the effective utilization of resources at the same time, the technology of solid waste treatment and utilization has been developed and promoted, turning miscellaneous salts into treasures, achieving certain economic benefits, and reducing the operating costs of zero discharge of wastewater. The output of chlorine-containing and salt-containing solid waste liquid in industrial waste is increasing. Harmful chlorine-containing organic matter is not only highly toxic, but also has stable physical and chemical properties and is difficult to degrade. It is difficult to achieve the purpose of detoxification by general methods. It has the characteristics of severity, long-term, potential, irreversibility, and difficulty in governance. If not properly handled, it will leave great hidden dangers to people's health, environment and economic development. Solid kettle residue is one of them.

[0003] Most of the solid waste is a mixture of salts and organic matter. Solid salt exists in the form of crystals. Organic matter exists stably in the lattice of salt crystals. It is difficult to separate organic matter from the salt lattice. Because it contains organic matter, it cannot be treated by landfill. There are mainly chemical methods, physical methods, biological treatment methods and stable solidification methods. The main purpose of these treatment methods is to achieve harmlessness by physically and chemically modifying the toxic and harmful substances in hazardous waste. In the process of preliminary treatment, the usable components in hazardous waste, such as metals, organic solvents, etc., can also be recovered, so incineration is an effective method for treating solid waste. Through the incineration process of the incinerator, the toxic and harmful organic components in the hazardous waste are further eliminated and reduced, and the heat source generated can also be recycled. However, during the incineration process, attention should be paid to gas emissions, and waste gas treatment equipment should be installed to avoid secondary pollution.

[0004] The incineration method treats the residual waste of chlorine-containing and salt-containing organic matter by high-temperature incineration, converting it into CO2 and H2O, and then discharging it into the atmosphere. As long as the temperature in the incinerator is greater than 1100°C and the waste liquid has a sufficiently long residence time in the high-temperature zone of the furnace, the harmful substances in the waste liquid can basically be completely decomposed to achieve pollution-free discharge. When the waste liquid includes chlorine-containing organic matter, a large amount of dioxins are easily produced when the incineration temperature is lower than 300-400°C. Dioxins are extremely toxic and difficult to degrade naturally, which seriously endangers the survival and health of humans and organisms. Based on the property that dioxins begin to decompose at 500°C and completely decompose at 800°C, high-temperature incineration of chlorine-containing organic matter is often used to decompose dioxins. However, the generated flue gas will synthesize dioxins again in large quantities as the temperature of the recovered heat decreases. Therefore, the development of a chlorine-containing and salt-containing organic waste liquid treatment device with a simple structure, high waste liquid treatment efficiency, and effective reduction of dioxin generation has become an urgent problem to be solved. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the above-mentioned problems and provide a fine chemical still residue environmental protection treatment and resource utilization system, which can not only treat the organic matter in the still residue, but also recover the salts in the still residue as chemical raw materials, which is of great significance to promoting environmental protection, reducing raw material consumption and sustainable development of the industry.

[0006] The present invention is a fine chemical still residue environmental protection treatment and resource utilization system realized by the following methods, including a hoist, a silo, a feeder, a still residue incinerator, a membrane wall waste heat boiler, a high-temperature flue gas rapid cooling and cooling regulating tower, a bag dust collector, a flue gas deacidification spray tower, an induced draft fan, a chimney, a double-axis cooler, a drum cooler, and a scraper conveyor. A feeder is arranged below the discharge port of the silo, and the feeder is connected to the still residue incinerator through a solid still residue inlet pipe. The feeder is driven by an electric motor to rotate the spiral to feed, and the compressed air is used to ensure that the high-temperature flue gas in the still residue incinerator will not leak out of the furnace through the feed port, and the feeding pipeline is cooled at the same time. The top of the kettle residue incinerator is connected to the membrane wall waste heat boiler through the flue, the lower side of the membrane wall waste heat boiler is connected to the high-temperature flue gas rapid cooling and cooling regulating tower through the flue, the lower part of the high-temperature flue gas rapid cooling and cooling regulating tower is connected to the bag filter through the flue, the upper part of the bag filter is connected to the lower part of the flue gas deacidification spray tower through the flue, the top of the flue gas deacidification spray tower is connected to the flue gas reheating furnace through the flue, the flue gas reheating furnace is connected to the SCR denitrification device through the flue, and the SCR denitrification device is connected to the induction The fan is connected, and the induced draft fan is connected to the chimney; a boss pipe is arranged at the center of the bottom plate of the incinerator of the kettle residue incinerator, and a boss top plate is arranged on the top of the boss pipe for sealing, and a molten salt salt flow pipe is installed at the center of the boss top plate, which is connected to the double-axis cooler through the lower part of the boss pipe, and is cooled by circulating cooling water in the double-axis cooler, and the double-axis cooler is connected to the drum cooler through a pipeline or a hoist, and the drum cooler is connected to the scraper conveyor below it, and the drum cooler is connected The incinerator is further cooled by air cooling or water cooling; the incinerator is composed of an upper combustion chamber and a lower combustion chamber, which are connected to each other through a middle furnace top wall; the middle furnace top wall is the top wall of the lower combustion chamber, and the middle furnace top wall is provided with a solid incinerator feed pipe and a liquid incinerator atomizing spray gun interface, and one end of the solid incinerator feed pipe is connected to the lower combustion chamber of the incinerator. The bottom of the membrane wall waste heat boiler, the high-temperature flue gas rapid cooling and cooling regulating tower and the bag filter are connected to the nitrogen replacement device through pipelines, and the bottom of the nitrogen replacement device is connected to the scraper conveyor through pipelines; the flue gas deacidification spray tower is provided with a first-stage spray bin, a second-stage spray bin, a third-stage spray bin and a flue gas dehydration dryer, and each spray bin is provided with a spray head, which is connected to the alkali solution pool through a pipeline and a deacidification spray pump.

[0007] The angle between the middle furnace top wall of the incinerator and the solid kettle residue feeding pipe and the liquid kettle residue atomizing spray gun is 30°-65°. A plurality of combined auxiliary fuel burners are arranged in the middle and lower parts of the lower combustion chamber of the incinerator. The auxiliary fuel burners are respectively connected to the auxiliary fuel tank and the combustion-supporting fan. The auxiliary fuel is transported to the combined burner, and the combustion-supporting air is transported to the combined burner by the combustion-supporting fan. The auxiliary fuel and the combustion-supporting air are burned in the adiabatic incinerator.

[0008] A boss pipe is arranged at the bottom of the lower combustion chamber of the incinerator, and a boss top plate is arranged on the top of the raised part of the boss pipe extending into the lower combustion chamber of the incinerator for sealing. A molten salt chute is arranged at the center of the boss top plate. The lower part of the entire lower combustion chamber of the incinerator and the raised part of the boss pipe are combined to form a kettle residue molten salt tank, in which the kettle residue is further melted at high temperature, so that the solid carbon (TOC) in the molten salt produced by incinerating the fine chemical kettle residue is fully burned.

[0009] The kettle residue incinerator is made of heat-resistant steel, and is coated with insulation cotton and metal guard plates on the periphery of the heat-resistant steel to ensure the purity of the recovered salts, so that it still has good structural properties at 1100°C. Insulation cotton is applied externally to keep the outer surface temperature of the incinerator below 60°C.

[0010] The four walls of the membrane wall waste heat boiler are all membrane walls, and upper headers are arranged on the upper parts of the membrane walls of the four walls. The upper headers are connected to the waste heat boiler drum through a steam-water connecting pipe ascending pipe system. The waste heat boiler drum is connected to the sub-cylinder, and multiple pipeline interfaces are arranged on the sub-cylinder. One of the pipeline interfaces is connected to the thermal deaerator through a pipeline and a flow regulating device, and the remaining pipeline interfaces on the sub-cylinder are connected to the heat user through pipelines; lower headers are arranged on the lower parts of the membrane walls of the four walls, and the boiler feed water is pumped from the lower water tank of the thermal deaerator through a boiler feed water pump to extract deoxygenated water and send it to the waste heat boiler drum The steam drum of the waste heat boiler is connected with the lower headers of the membrane wall on the four walls through the centralized downcomers of the steam-water connecting pipes and the water supply distribution pipelines; a plurality of groups of [type membrane wall evaporator tube screens are built in the furnace of the membrane wall waste heat boiler, and the upper and lower parts of each group of [type membrane wall evaporator tubes are collected in a collecting pipe, the upper collecting pipe of the evaporator tube screen is connected with the centralized upper header of the membrane wall evaporator tube screen, and is connected with the steam drum of the waste heat boiler through the steam-water connecting pipe ascending pipe system, the lower collecting pipe of the evaporator tube screen is connected with the centralized lower header of the membrane wall evaporator tube screen, and is connected with the steam drum of the waste heat boiler through the centralized downcomers of the steam-water connecting pipes, and the whole boiler forms a natural circulation system.

[0011] The middle furnace portion of the membrane wall evaporation tube panel built into the membrane wall waste heat boiler is provided with an SNCR denitration ammonia injection port.

[0012] The flue gas deacidification spray tower is made of glass fiber reinforced plastics and adopts an empty tower structure. Two layers of demisters are arranged on the top of the flue gas deacidification spray tower to dehydrate and dry the flue gas.

[0013] A rapid cooling water spray atomizing spray gun is arranged on the upper part of the high-temperature flue gas rapid cooling and cooling regulating tower. The rapid cooling water spray atomizing spray gun is connected to a rapid cooling water spray pump and a rapid cooling water buffer tank through a pipeline.

[0014] The flue gas deacidification spray tower is connected to the flue gas reheat furnace through a pipeline, the flue gas reheat furnace is connected to the SCR denitrification device through a pipeline, an SCR denitrification ammonia spray port is arranged on the flue connecting the flue gas reheat furnace and the SCR denitrification device, and an induced draft fan is provided on the pipeline connecting the SCR denitrification device and the chimney.

[0015] One end of the nitrogen replacement device is connected to the nitrogen source through a pipeline, and the other end is connected to the inlet section pipeline of the bag filter through a pipeline collection.

[0016] The lower ash hopper of the bag filter adopts steam or electric heating to ensure that the metal wall temperature of the lower ash hopper of the bag filter is higher than the acid dew point temperature of the flue gas flowing through it.

[0017] The beneficial effects of the present invention improve the disadvantages of the traditional solid still residue treatment system, making the environmentally friendly treatment system of the solid still residue simpler, more complete and more reliable; at the same time, the incineration temperature of the incinerator is not lower than 1100°C, which fully meets the requirements of the hazardous waste incineration pollution control standard; the incinerator adopts the form of heat-resistant steel with external insulation cotton, which reduces the weight of the incinerator and avoids the influence of refractory material falling off on the purity of the recovered salts; the liquid salt discharge method is adopted to burn the salts in the still residue into a molten state, so that all the organic matter in the salt lattice is released, thereby improving the purity of the recovered salts. Fourth, a membrane wall waste heat boiler is set up, which not only recovers the heat of high-temperature flue gas and generates steam or hot water for users, but also ensures reliable operation of the system, without inorganic salts adhering to or blocking the boiler flue gas flow passage; a bag filter is set up to separate the flue gas generated by incineration into gas and solid, so that the concentration of particulate matter fully meets the emission standards; a deacidification tower is set up to remove acidic gases in the flue gas; a SNCR and SCR two-stage denitrification device is set up to remove NOx gas in the flue gas, ensuring that NOx emissions in the flue gas fully meet the emission standards. The present invention treats the solid kettle residue harmlessly, reduces the amount of gas, and recycles it, and also recovers the heat energy generated by its incineration, recovers the salts in the kettle residue, and realizes the environmental protection and energy-saving requirements of the solid kettle residue treatment, which not only saves energy but also is beneficial to the protection of the atmospheric environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the overall structure diagram;

[0019] Figure 2 It is an enlarged view of the whole part;

[0020] Figure 3 It is the system flow chart;

[0021] like Figures 1 to 3 The invention comprises the following components: a hoist (1), a silo (2), a feeder (3), a feed air interface (4), a solid kettle residue feeding pipe (5), a molten salt sluice pipe (6), a boss pipe (7), an incinerator bottom plate (8), a double-axis cooler (9), a scraper conveyor (10), a drum cooler (11), a boss top plate (12), an auxiliary fuel incinerator (13), a liquid kettle residue atomizing spray gun (14), an incinerator middle furnace top wall (15), an incinerator upper combustion chamber (16), an incinerator flue gas outlet flue (17), a waste heat boiler drum (18), a steam-water connecting pipe ascending pipe system (19), a steam-water connecting pipe centralized descending pipe (20), a membrane wall waste heat boiler (21), a membrane wall evaporation tube screen (22), a membrane wall evaporation tube screen centralized upper header (23), a SN CR denitration ammonia spray port (24), membrane wall evaporator tube screen centralized lower header (25), high temperature flue gas rapid cooling and cooling regulating tower (26), rapid cooling and cooling water spray atomizing spray gun (27), bag filter (28), lower ash hopper of bag filter (29), flue gas deacidification spray tower (30), flue gas reheat furnace (31), SCR denitration ammonia spray port (32), SCR denitration device (33), induced draft fan (34), chimney (35), nitrogen replacement device (36), combustion-supporting fan (37), steam cylinder (38), boiler feed water pump (39), thermal deaerator (40), rapid cooling water spray pump (41), rapid cooling water buffer tank (42), deacidification spray pump (43), kettle residue incinerator (44), lower combustion chamber of incinerator (45), alkali liquid pool (46). DETAILED DESCRIPTION

[0022] A fine chemical reactor residue environmental protection treatment and resource utilization system, wherein the discharge port of an elevator (1) is opposite to the feed port of a silo (2), a feeder (3) is arranged below the discharge port of the silo (2), the feeder (3) is connected to a reactor residue incinerator (44) through a solid reactor residue inlet pipe (5), the top of the reactor residue incinerator (44) is connected to a membrane wall waste heat boiler (21) through a flue, the lower side of the membrane wall waste heat boiler (21) is connected to a high-temperature flue gas rapid cooling and cooling regulating tower (26) through the flue, the lower part of the high-temperature flue gas rapid cooling and cooling regulating tower (26) is connected to a bag filter (28) through the flue, and the upper part of the bag filter (28) is connected to a flue gas deacidification system through the flue. The bottom of the spray tower (30) is connected, the top of the flue gas deacidification spray tower (30) is connected to the flue gas reheating furnace (31) through the flue, the flue gas reheating furnace (31) is connected to the SCR denitration device (33) through the flue, the SCR denitration device (33) is connected to the induced draft fan (34), and the induced draft fan (34) is connected to the chimney (10); a boss pipe (7) is arranged at the center of the incinerator bottom plate (8) of the kettle residue incinerator (44), a boss top plate (12) is arranged at the top of the boss pipe (7) for sealing, a molten salt salt flow pipe (6) is installed at the center of the boss top plate (12), and is connected to the double-axis cooler (9) through the lower part of the boss pipe (7), and the double-axis cooler ( 9) is connected to a drum cooler (11) through a pipeline or a hoist, and the drum cooler (11) is connected to a scraper conveyor (10) below it; the kettle residue incinerator (44) is composed of an upper combustion chamber (16) and a lower combustion chamber (45) of the incinerator, and the upper combustion chamber (16) and the lower combustion chamber (45) of the incinerator are connected to form a whole through a middle furnace top wall (15) of the incinerator; the middle furnace top wall (15) of the incinerator is the top wall of the lower combustion chamber (45) of the incinerator, and the middle furnace top wall (15) of the incinerator is provided with a solid kettle residue feeding pipe (5) and a liquid kettle residue atomizing spray gun (14) interface, and the solid kettle residue feeding pipe (5) one end is connected to the lower combustion chamber (45) of the kettle residue incinerator (44), and the other end is connected to the feed air interface (4); the bottoms of the membrane wall waste heat boiler (21), the high-temperature flue gas rapid cooling and cooling adjustment tower (26) and the bag filter (28) are respectively connected to the nitrogen replacement device (36) through pipelines, and the bottom of the nitrogen replacement device (36) is connected to the scraper conveyor (10) through a pipeline; the flue gas deacidification spray tower (30) is provided with a first-stage spray bin, a second-stage spray bin, a third-stage spray bin and a flue gas dehydration dryer, and each spray bin is provided with a spray head, and the spray head is connected to the alkali liquid pool (46) through a pipeline and a deacidification spray pump (43).

[0023] The included angle between the middle furnace top wall (15) of the incinerator and the solid kettle residue inlet pipe (5) and the liquid kettle residue atomizing spray gun (14) is 30°-65°. A plurality of combined auxiliary fuel incinerators (13) are arranged in the middle and lower parts of the lower combustion chamber (45) of the incinerator. The auxiliary fuel incinerators (13) are respectively connected to the auxiliary fuel tank and the combustion-supporting fan (37).

[0024] A boss tube (7) is arranged at the bottom of the lower combustion chamber (45) of the incinerator, and a boss top plate (12) is arranged at the top of the raised portion of the boss tube (7) extending into the lower combustion chamber (45) of the incinerator for sealing. A molten salt chute (6) is arranged at the center of the boss top plate (12). The lower part of the entire lower combustion chamber (45) of the incinerator and the raised portion of the boss tube (7) are combined to form a kettle residue molten salt tank, in which the kettle residue is further melted at high temperature, so that the solid carbon (TOC) in the molten salt produced by the incineration of fine chemical kettle residue is fully burned.

[0025] The kettle residue incinerator (44) is made of heat-resistant steel, and the outer periphery of the heat-resistant steel is covered with heat-insulating cotton and a metal guard plate.

[0026] The membrane wall waste heat boiler (21) has four walls that are membrane walls. Upper headers are arranged on the upper parts of the membrane walls of the four walls. The upper headers are connected to the waste heat boiler drum (18) through a steam-water connecting pipe ascending pipe system (19). The waste heat boiler drum (18) is connected to a steam cylinder (38). A plurality of pipeline interfaces are arranged on the steam cylinder (38). One of the pipeline interfaces is connected to a thermal deaerator (40) through a pipeline and a flow regulating device. The remaining pipeline interfaces on the steam cylinder (38) are connected to heat users through pipelines. Lower headers are arranged on the lower parts of the membrane walls of the four walls. Boiler feed water is pumped from the lower water tank of the thermal deaerator (40) by a boiler feed water pump (39) to extract deoxygenated water and send it to the waste heat boiler drum (18). The steam drum (18) of the heat boiler is connected to the membrane wall lower headers on the four walls through the steam-water connecting pipe centralized downcomer (20) and the water supply distribution pipeline; the furnace of the membrane wall waste heat boiler (21) is equipped with multiple groups of [type membrane wall evaporation tube panels (22), and the upper and lower parts of each group of [type membrane wall evaporation tubes are collected into a collecting pipe. The upper collecting pipe of the evaporation tube panel (22) is connected to the membrane wall evaporation tube panel centralized upper header (23), and is connected to the waste heat boiler steam drum (18) through the steam-water connecting pipe ascending pipe system (19); the lower collecting pipe of the evaporation tube panel (22) is connected to the membrane wall evaporation tube panel centralized lower header (25), and is connected to the waste heat boiler steam drum (18) through the steam-water connecting pipe centralized downcomer (20), and the whole boiler forms a natural circulation system.

[0027] The middle furnace portion of the membrane wall evaporation tube panel (22) built into the membrane wall waste heat boiler (21) is provided with an SNCR denitration ammonia injection port (24).

[0028] The flue gas deacidification spray tower (30) is made of glass fiber reinforced plastic and adopts an empty tower structure. Two layers of demisters are arranged on the top of the flue gas deacidification spray tower (30) to dehydrate and dry the flue gas.

[0029] A rapid cooling water spray atomizing spray gun (27) is arranged on the upper part of the high-temperature flue gas rapid cooling and temperature adjustment tower (26). The rapid cooling water spray atomizing spray gun (27) is connected to a rapid cooling water spray pump (41) and a rapid cooling water buffer tank (42) through a pipeline.

[0030] The flue gas deacidification spray tower (30) is connected to the flue gas reheat furnace (31) through a pipeline, and the flue gas reheat furnace (31) is connected to the SCR denitration device (33) through a pipeline. An SCR denitration ammonia spray port (32) is arranged on the flue connecting the flue gas reheat furnace (31) and the SCR denitration device (33), and an induced draft fan (34) is arranged on the pipeline connecting the SCR denitration device (33) and the chimney (35).

[0031] One end of the nitrogen replacement device (36) is connected to the nitrogen source via a pipeline, and the other end is connected to the inlet section pipeline of the bag filter (28) via a pipeline collection.

[0032] The lower ash hopper (29) of the bag filter is heated by steam or electricity to ensure that the metal wall temperature of the lower ash hopper (29) of the bag filter is higher than the acid dew point temperature of the flue gas flowing through it.

[0033] The solid kettle residue is fed into the silo through the elevator (1), and the solid kettle residue falls into the inlet of the feeder (3) in the silo (2) by gravity. The feeder (3) feeds the kettle residue incinerator (44) through the solid kettle residue inlet pipe (5), and is pushed into the kettle residue incinerator (44) by compressed air, and the feed pipe is protected. The auxiliary fuel incinerator (13) and the liquid kettle residue atomizing spray gun (14) cooperate to burn the auxiliary fuel and the combustion-supporting air in the kettle residue incinerator (44), so that the temperature in the kettle residue incinerator (44) is not lower than 1100°C, and the temperature of the molten salt pool at the bottom of the incinerator is always kept higher than the melting point of the salt, ensuring that the molten salt has good fluidity and flows out through the boss pipe (7). The kettle residue enters from the top of the kettle residue incinerator (44), and undergoes drying, bursting, and melting in the falling stage, and finally falls into the bottom of the incinerator. During the incineration process, all the organic matter contained in the kettle residue is released and oxidized and decomposed at high temperature to produce CO2, H2O, NO xThe high-temperature flue gas is kept at a temperature of not less than 1100°C for not less than 2 seconds; the melted salts of the still residue fall into the bottom of the still residue incinerator and flow out through the molten salt chute (6), enter the double-axis cooler (9) to be cooled into a solid state and broken, and then enter the drum cooler (9) to continue cooling, and finally fall into the scraper conveyor (10) and are sent to be packaged. The flue gas outlet (17) of the incinerator is provided with an ammonia inlet hole, into which ammonia is sprayed. At 1100°C, ammonia reacts with NO in the flue gas. x A reduction reaction occurs, converting NO x Reduce to nitrogen to reduce NO x Purpose of emission concentration.

[0034] After being drawn out from the upper combustion chamber (16) of the incinerator, the high-temperature flue gas at 1100°C enters the membrane wall waste heat boiler (21) together with the ammonia gas, and exchanges heat with the boiler water in the membrane wall tube. The molten salt contained in the high-temperature flue gas rapidly cools down after contacting the membrane wall, and becomes brittle salt, which falls off under the action of its own gravity and the soot blower, and falls into the scraper conveyor (10) from the ash drop pipe at the bottom of the membrane wall waste heat boiler (21). At the outlet of the membrane wall waste heat boiler (21), although the high-temperature flue gas and the water-cooled wall tube are horizontally flushed, the membrane wall evaporator tube screen (22) reduces the temperature of the high-temperature flue gas at the outlet of the membrane wall waste heat boiler (21) to about 550°C. At this time, the salt in the flue gas exists in solid form and no blockage occurs. The remaining steam-water mixture is introduced into the waste heat boiler drum (18) through a pipeline. The saturated steam in the waste heat boiler drum (18) is separated by a separation device and sent to a steam separator (38). A portion of the saturated steam separated from the steam separator (38) is sent to a thermal deaerator (40), and the excess steam is sent to the user's steam network or used for other purposes. The desalinated water enters the thermal deaerator (40), and after being deoxygenated by low-pressure steam, its temperature rises to about 104° C., and is then transported to the waste heat boiler drum (18) through a boiler feed water pump. The waste heat boiler drum (18) and the membrane wall waste heat boiler (21) body form a circulation loop, and exchange heat with the high-temperature flue gas to generate saturated steam.

[0035] The temperature of the flue gas after exiting the membrane wall waste heat boiler (21) is about 550°C, and then the flue gas is sent to the high-temperature flue gas rapid cooling and cooling regulating tower (26), where it is contacted with the desalted water sprayed in atomization for heat exchange, so that the flue gas temperature is reduced from 550°C to below 200°C in a very short time (less than 1s), thereby shortening the residence time of the flue gas in the dioxin synthesis temperature range and curbing the generation of dioxin substances.

[0036] The flue gas from the high-temperature flue gas rapid cooling and cooling regulating tower (26) enters the bag filter (28). The bag filter (28) has a high capture efficiency for ash of all particle sizes, and the captured ash falls into the scraper conveyor (10). The flue gas leaving the bag filter (28) enters the flue gas deacidification spray tower (30). The flue gas deacidification spray tower (30) is made of glass fiber reinforced plastic and adopts an empty tower form. The interior is divided into a primary spray chamber, a secondary spray chamber and a tertiary spray chamber. The circulating alkali solution is pressurized by the deacidification spray pump and sprayed in to remove the acid gas in the flue gas. The pH value of the alkali solution is adjusted by the alkali solution tank (46) composed of a sedimentation tank, a clear water tank and a neutralization tank, and the NaOH solution is added to the neutralization tank. The flue gas coming out of the flue gas deacidification spray tower (30) carries a lot of moisture, and then passes through the flue gas reheat furnace (31), the SCR denitration ammonia spray port (32), and the SCR denitration device (33) for treatment in sequence, and is finally drawn out by the induced draft fan (34) and sent to the chimney (35) to be discharged into the atmosphere.

Claims

1. A fine chemical reactor residue environmental protection treatment and resource utilization system, characterized in that: The discharge port of the elevator (1) is opposite to the feed port of the silo (2). A feeder (3) is arranged below the discharge port of the silo (2). The feeder (3) is connected to the kettle residue incinerator (44) through a solid kettle residue inlet pipe (5). The kettle residue incinerator (44) is made of heat-resistant steel, and the outer periphery of the heat-resistant steel is covered with insulation cotton and a metal guard plate. The top of the kettle residue incinerator (44) is connected to the membrane wall waste heat boiler (21) through a flue. The lower side of the membrane wall waste heat boiler (21) is connected to the high-temperature flue gas rapid cooling and cooling regulating tower (26) through the flue. The lower part of the high-temperature flue gas rapid cooling and cooling regulating tower (26) is connected to the bag dust collector (28) through the flue. The bag dust collector (28) The upper part of the flue gas deacidification spray tower (30) is connected to the lower part of the flue gas deacidification spray tower (30) through the flue, the top of the flue gas deacidification spray tower (30) is connected to the flue gas reheating furnace (31) through the flue, the flue gas reheating furnace (31) is connected to the SCR denitration device (33) through the flue, the SCR denitration device (33) is connected to the induced draft fan (34), and the induced draft fan (34) is connected to the chimney (35); a boss pipe (7) is arranged at the center of the incinerator bottom plate (8) of the kettle residue incinerator (44), a boss top plate (12) is arranged on the upper top of the boss pipe (7) for sealing, a molten salt salt flow pipe (6) is installed at the center of the boss top plate (12), and is connected to the double-axis cooler (9) through the lower part of the boss pipe (7). The double-axis cooler (9) is connected to the drum cooler (11) through a pipeline or a hoist, and the drum cooler (11) is connected to the scraper conveyor (10) below it; the kettle residue incinerator (44) is composed of an upper combustion chamber (16) and a lower combustion chamber (45) of the incinerator, and the upper combustion chamber (16) and the lower combustion chamber (45) of the incinerator are connected to form a whole through the middle furnace top wall (15) of the incinerator; the middle furnace top wall (15) of the incinerator is the top wall of the lower combustion chamber (45) of the incinerator, and the middle furnace top wall (15) of the incinerator is provided with a solid kettle residue inlet pipe (5) and a liquid kettle residue atomizing gun (14) interface, and the solid kettle residue inlet pipe (5) and the liquid kettle residue atomizing gun (14) interface are connected to form a whole; the middle furnace top wall (15) of the incinerator is the top wall of the lower combustion chamber (45) of the incinerator, and the solid kettle residue inlet pipe (5) and the liquid kettle residue atomizing gun (14) interface are connected to form a whole; ... One end of the furnace feed pipe (5) is connected to the lower combustion chamber (45) of the kettle residue incinerator (44), and the other end is connected to the feed air interface (4); the bottoms of the membrane wall waste heat boiler (21), the high-temperature flue gas rapid cooling and cooling regulating tower (26) and the bag filter (28) are respectively connected to the nitrogen replacement device (36) through pipelines, and the bottom of the nitrogen replacement device (36) is connected to the scraper conveyor (10) through a pipeline; the flue gas deacidification spray tower (30) is provided with a first-stage spray bin, a second-stage spray bin, a third-stage spray bin and a flue gas dehydration dryer, and each spray bin is provided with a spray head, and the spray head is connected to the alkali liquid pool (46) through a pipeline and a deacidification spray pump (43);The angle between the middle furnace top wall (15) of the incinerator and the solid kettle residue inlet pipe (5) and the liquid kettle residue atomizing gun (14) is 30°-65°. A plurality of combined auxiliary fuel incinerators (13) are arranged in the middle and lower parts of the lower combustion chamber (45) of the incinerator. The auxiliary fuel incinerators (13) are respectively connected to the auxiliary fuel tank and the combustion-supporting fan (37). A boss pipe (7) is arranged at the bottom of the lower combustion chamber (45) of the incinerator. The boss pipe (7) extends A boss top plate (12) is arranged at the top of the raised part of the lower combustion chamber (45) of the inlet furnace for sealing, and a molten salt chute (6) is arranged at the center of the boss top plate (12). The lower part of the entire lower combustion chamber (45) of the inlet furnace and the raised part of the boss tube (7) are combined to form a kettle residue molten salt tank, in which the kettle residue molten salt is further melted at high temperature by an auxiliary fuel burner (13), so that the solid carbon (TOC) in the molten salt generated by burning the fine chemical kettle residue is fully burned. ; 2. A fine chemical reactor residue environmental protection treatment and resource utilization system according to claim 1, characterized in that: The membrane wall waste heat boiler (21) has four walls made of membrane walls. The upper parts of the membrane walls of the four walls are arranged with upper headers. The upper headers are connected to the waste heat boiler drum (18) through a steam-water connecting pipe ascending pipe system (19). The waste heat boiler drum (18) is connected to a steam sub-cylinder (38). A plurality of pipeline interfaces are arranged on the steam sub-cylinder (38), one of which is connected to a thermal deaerator (40) through a pipeline and a flow regulating device, and the remaining pipeline interfaces on the steam sub-cylinder (38) are connected to heat users through pipelines. The lower parts of the membrane walls of the four walls are arranged with lower headers. The boiler feed water is pumped from the lower water tank of the thermal deaerator (40) by a boiler feed water pump (39) to extract deoxygenated water and send it to the waste heat boiler drum (18). The steam drum (18) of the hot boiler is connected to the membrane wall lower headers on the four walls through the steam-water connecting pipe centralized downcomer (20) and the water supply distribution pipeline; the furnace of the membrane wall waste heat boiler (21) is built with multiple groups of [type membrane wall evaporation tube panels (22), and the upper and lower parts of each group of [type membrane wall evaporation tubes are collected into a collecting pipe. The upper collecting pipe of the evaporation tube panel (22) is connected to the membrane wall evaporation tube panel centralized upper header (23), and is connected to the waste heat boiler steam drum (18) through the steam-water connecting pipe ascending pipe system (19); the lower collecting pipe of the evaporation tube panel (22) is connected to the membrane wall evaporation tube panel centralized lower header (25), and is connected to the waste heat boiler steam drum (18) through the steam-water connecting pipe centralized downcomer (20), and the whole boiler forms a natural circulation system.

3. A fine chemical reactor residue environmental protection treatment and resource utilization system according to claim 1, characterized in that: The middle furnace portion of the membrane wall evaporation tube panel (22) built into the membrane wall waste heat boiler (21) is provided with an SNCR denitration ammonia injection port (24).

4. A fine chemical still residue environmental protection treatment and resource utilization system according to claim 1, characterized in that: The flue gas deacidification spray tower (30) is made of glass fiber reinforced plastic and adopts an empty tower structure. Two layers of demisters are arranged on the top of the flue gas deacidification spray tower (30) to dehydrate and dry the flue gas.

5. The fine chemical reactor residue environmental protection treatment and resource utilization system according to claim 1 is characterized in that: A rapid cooling water spray atomizing spray gun (27) is arranged on the upper part of the high-temperature flue gas rapid cooling and cooling regulating tower (26), and the rapid cooling water spray atomizing spray gun (27) is connected to a rapid cooling water spray pump (41) and a rapid cooling water buffer tank (42) through a pipeline.

6. The fine chemical reactor residue environmental protection treatment and resource utilization system according to claim 1 is characterized in that: The flue gas deacidification spray tower (30) is connected to the flue gas reheat furnace (31) through a pipeline, and the flue gas reheat furnace (31) is connected to the SCR denitration device (33) through a pipeline. An SCR denitration ammonia spray port (32) is arranged on the flue connecting the flue gas reheat furnace (31) and the SCR denitration device (33), and an induced draft fan (34) is arranged on the pipeline connecting the SCR denitration device (33) and the chimney (35).

7. The fine chemical reactor residue environmental protection treatment and resource utilization system according to claim 1 is characterized in that: One end of the nitrogen replacement device (36) is connected to the nitrogen source through a pipeline, and the other end is connected to the inlet section pipeline of the bag filter (28) through a pipeline collection.

8. The fine chemical reactor residue environmental protection treatment and resource utilization system according to claim 1 is characterized in that: The lower ash hopper (29) of the bag filter adopts steam or electric heating to ensure that the metal wall temperature of the lower ash hopper (29) of the bag filter is higher than the acid dew point temperature of the flue gas flowing through it.

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