A resource-based environmentally friendly treatment system for salt-containing, high-nitrogen-containing and phosphorus-containing adiponitrile organic waste liquid

Abstract

The present invention provides a resource-based environmental protection treatment system for salt-containing, high-nitrogen-containing and phosphorus-containing adiponitrile organic waste liquid, comprising: a U-shaped incineration boiler, a cooling chamber, a high-temperature-resistant flexible metal membrane bag-type gas-solid separator, a quenching tower, a packed absorption tower, an alkali washing tower, a flue gas heater, an SCR denitration device, an air preheater, an economizer, a bag dust collector, an induced draft fan and a chimney, which are arranged in sequence, and the U-shaped incineration boiler and the cooling chamber are connected to the steam drum. The resource-based environmental protection treatment system for salt-containing, high-nitrogen-containing and phosphorus-containing adiponitrile organic waste liquid of the present invention can realize resource utilization, and recycle heavy metals and inorganic salts in the waste liquid. The present invention can achieve rough separation of heavy metals and inorganic salts, recover heavy metals at the bottom of the incineration boiler, recover solid salts at the bottom of the cooling chamber and the high-temperature-resistant flexible metal membrane bag-type gas-solid separator, and recover crystalline phosphates in the circulation pool. The present invention produces saturated steam as a byproduct for production use, which can generate income and achieve energy saving.

Description

Technical Field

[0001] The invention relates to a waste liquid resource recovery and environmental protection treatment technology, and in particular to a salt-containing, high-nitrogen and phosphorus-containing adiponitrile organic waste liquid resource recovery and environmental protection treatment system. Background Art

[0002] Adiponitrile, as an important chemical raw material, is a colorless and transparent oily liquid. It is mainly used for hydrogenation to generate hexamethylenediamine. Hexamethylenediamine and adipic acid undergo polycondensation to produce a translucent or opaque milky white synthetic resin (i.e., nylon 66), which has good wear resistance, heat resistance, corrosion resistance, and mechanical strength. This is the most important industrial use of adiponitrile so far. Adiponitrile can also be used in rocket fuel, electroplating industry, detergent additives, and pesticides. In the past, my country's adiponitrile mainly relied on imports. With the rapid development of my country's chemical industry in recent years, the demand for adiponitrile has gradually increased, and multiple sets of adiponitrile production facilities have been built in various places.

[0003] At present, the main process routes for producing adiponitrile include acrylonitrile electrolytic dimerization, adipic acid catalytic amination and butadiene process. However, these three process routes will produce some organic waste liquids to varying degrees during the production process, mainly some intermediate products, catalysts, and additives produced by side reactions, mainly butene nitrile, pentene nitrile, trimethylphenyl phosphite, methyl glutaronitrile, meta-cresol, heavy metal catalysts, inorganic salts and other impurities. The waste liquid contains a lot of organic matter, and most of it is toxic. If it is discharged directly, it will continue to accumulate and store in natural environments such as water bodies and soil, and then enter the human body, endangering health. Due to biodegradation, high-concentration organic waste liquid discharged into water bodies will cause the receiving water body to be hypoxic or even anaerobic, most aquatic organisms will die, produce stench, and deteriorate water quality and environment. Heavy metals in waste liquids enter the environment, are not easily metabolized in the environment, and are easily enriched by organisms, which not only pollutes the environment, but also seriously threatens the survival of humans and aquatic organisms. Excessive intake of heavy metals by the human body can cause various diseases, such as cancer and deformity. Summary of the invention

[0004] The purpose of the present invention is to propose a resource-based environmentally friendly treatment system for salt-containing, high-nitrogen and phosphorus-containing adiponitrile organic waste liquid in response to the above problems. The system can realize resource utilization and recycle heavy metals and salts in the waste liquid.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a resource-based environmental protection treatment system for salt-containing, high-nitrogen-containing and phosphorus-containing adiponitrile organic waste liquid, comprising: a U-shaped incineration boiler, a cooling chamber, a high-temperature resistant flexible metal membrane bag-type gas-solid separator, a quenching tower, a packed absorption tower, an alkali washing tower, a flue gas heater, an SCR denitrification device, an air preheater, an economizer, a bag dust collector, an induced draft fan and a chimney arranged in sequence, and the U-shaped incineration boiler and the cooling chamber are connected to the steam drum.

[0006] Furthermore, the U-shaped incineration boiler and the cooling chamber of the built-in L-shaped hanging screen heating surface are in an inverted "U" shape, and the U-shaped incineration boiler and the top of the cooling chamber of the built-in L-shaped hanging screen heating surface are connected through a connecting flue;

[0007] Furthermore, one side of the U-shaped incineration boiler is a gasification chamber, and the other side is a high-temperature incineration chamber, and the gasification chamber and the high-temperature incineration chamber are separated by a membrane water-cooled wall partition; the bottom of the gasification chamber is connected to the bottom of the high-temperature incineration chamber through a flue gas turning chamber, and a first ash outlet is arranged at the bottom of the flue gas turning chamber, and the first ash outlet is connected to a double-axis cooler and a water-cooled scraper conveyor at one time through a pipeline; a combined burner is arranged on the top of the gasification chamber; one side of the U-shaped incineration boiler performs cracking and gasification of adiponitrile organic high-nitrogen, phosphorus-containing and salt-containing waste liquid, and the other side performs high-temperature incineration of the cracking gasification gas with low nitrogen combustion, which avoids direct combustion and produces a large amount of nitrogen oxides, greatly reduces equipment investment and operating costs for the post-stage environmental protection denitration treatment of flue gas, and makes the whole system more economical. The combined burner is respectively connected to the primary fan combustion-supporting air pipeline, the natural gas pipeline and the waste liquid buffer tank. Specifically, the combustion-supporting air pipeline is connected to the combined burner through a primary air fan; and the waste liquid buffer tank is connected to the waste liquid spray gun of the combined burner through a waste liquid booster pump.

[0008] Furthermore, the middle part of the furnace of the U-shaped incineration boiler is connected to the secondary fan.

[0009] Furthermore, the U-shaped incineration boiler has a membrane wall structure and is lined with refractory castables, which can prevent heavy metals from wearing the membrane wall and reduce the heat absorption of the membrane wall, which is beneficial to maintaining the temperature inside the incineration boiler. At the same time, it can also effectively prevent the P2O5 generated by combustion from forming phosphoric acid on the metal wall surface and corroding the metal heating surface.

[0010] Furthermore, the ash hopper at the bottom of the U-shaped incineration boiler is connected to the first drum cooler, and the first drum cooler is connected to the water-cooled first scraper conveyor, so that the heavy metals in the waste liquid are sent to the packaging workshop for packaging and storage.

[0011] Furthermore, the cooling chamber is a membrane wall structure, and a membrane wall-mounted screen heating surface is arranged in the cooling chamber.

[0012] Furthermore, both ends of the flue connecting the incineration boiler and the cooling chamber use thinning pipes as slag condensation pipe bundles to efficiently capture particulate matter in the flue gas.

[0013] Furthermore, the membrane wall-mounted panel heating surface arranged in the cooling chamber is composed of multiple groups of membrane wall tube panels, and forms a closed circulation loop with the boiler drum through pipelines.

[0014] Furthermore, a SNCR spray gun is arranged at the inlet of the cooling chamber, and the ammonia buffer tank is connected to the SNCR spray gun through a SNCR ammonia spray pump.

[0015] Furthermore, a steam-water separation device is arranged in the steam drum, the saturated steam outlet of the steam drum is connected with the steam cylinder, and the steam cylinder outlet is respectively connected with the thermal deaerator and the steam pipe network.

[0016] Furthermore, the thermal deaerator is connected to the refrigerant inlet of the economizer through a boiler feed water pump, and the refrigerant outlet of the economizer is connected to the steam drum.

[0017] Furthermore, the flue gas inlet of the high-temperature resistant flexible metal membrane bag type gas-solid separator is connected to the flue gas outlet of the cooling chamber; the flue gas outlet of the high-temperature resistant flexible metal membrane bag type gas-solid separator is connected to the flue gas inlet of the quenching tower; the ash discharge port of the high-temperature resistant flexible metal membrane bag type gas-solid separator is connected to the water-cooled second scraper conveyor.

[0018] Furthermore, the resource-based environmental protection treatment system for the salt-containing, high-nitrogen and phosphorus-containing adiponitrile organic waste liquid also includes a circulating pool, in which a circulating cooling water coil is arranged, and the circulating cooling water coil is connected to the circulating cooling water pipeline in the plant area; the shell side of the circulating pool is connected to the quenching tower through a quenching tower spray pump; the shell side of the circulating pool is connected to the packed absorption tower through an absorption tower spray pump.

[0019] Furthermore, fillers are arranged in the packed absorption tower, and a spray layer is arranged on the filler layer.

[0020] Furthermore, a storage tank is arranged at the lower part of the alkali washing tower, and alkali solution is prepared in the storage tank, and the storage tank is connected with the alkali washing tower through the alkali washing tower spray pump.

[0021] Furthermore, a two-layer folded plate demister is arranged on the top of the alkali washing tower, which can collect large particle droplets carried in the flue gas and improve the operating conditions of subsequent devices.

[0022] Furthermore, an ammonia spray gun is arranged at the inlet of the SCR denitration device, and the ammonia buffer tank is fed into the static mixer through the SCR ammonia spray pump, and the static mixer outlet is connected to the ammonia spray gun.

[0023] The environmentally friendly treatment system for the resource-based treatment of salt-containing, high-nitrogen and phosphorus-containing adiponitrile organic waste liquid of the present invention has the following advantages compared with the prior art:

[0024] 1) The present invention can realize resource utilization and recycle heavy metals and salts in waste liquid.

[0025] 2) The present invention can achieve rough separation of heavy metals and salts, recover heavy metals at the bottom of the incineration boiler, recover solid salts at the bottom of the cooling chamber, and recover crystalline phosphates in the circulation pool.

[0026] 3) The present invention not only uses pyrolysis and gasification to convert organic nitrogen in waste liquid into nitrogen to achieve the purpose of denitrification, but also reduces the generation of NOx by high-temperature combustion by supplementing air and controlling the combustion temperature at 1100-1150°C for the combustible gas generated by pyrolysis and gasification of organic waste liquid, thereby achieving denitrification, reducing the consumption of ammonia water, and reducing operating costs.

[0027] 4) The present invention produces saturated steam as a by-product, which can generate income. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a system for recycling and environmentally friendly treatment of organic waste liquid containing salt, high nitrogen and phosphorus adiponitrile;

[0029] Figure 2 This is a flow chart of the environmentally friendly resource treatment system for salt-containing, high-nitrogen and phosphorus-containing adiponitrile organic waste liquid.

[0030] Serial number and name:

[0031] 1. Incineration boiler; 2. Cooling chamber; 3. High temperature resistant flexible metal membrane bag type gas-solid separator; 4. Rapid cooling tower; 5. Packing absorption tower; 6. Alkali washing tower; 7. Flue gas heater; 8. SCR denitration device; 9. Air preheater; 10. Economizer; 11. Bag filter; 12. Induced draft fan; 13. Chimney; 14. Steam drum; 15. Separator cylinder; 16. Thermal deaerator; 17. Waste liquid buffer tank; 18. Ammonia buffer tank; 19. First scraper conveyor; 20. Second scraper conveyor; 21. First roller cooler; 22. Second roller cooler; 23. Primary fan; 24. Secondary fan; 25. Flue gas heater fan; 26. Waste liquid booster pump; 27. Boiler feed water pump; 28. Quenching tower spray pump; 29. ​​Absorption tower spray pump; 30. Alkaline washing tower spray pump; 31. First SCR ammonia water spray pump; 32. SNCR ammonia water spray pump. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with embodiments:

[0033] Example 1

[0034] This embodiment discloses a system for recycling and environmentally friendly treatment of salt-containing, high-nitrogen-containing and phosphorus-containing adiponitrile organic waste liquid. Figure 1-2 As shown, the resource-based environmental protection treatment system for salt-containing, high-nitrogen-containing and phosphorus-containing adiponitrile organic waste liquid includes: a U-shaped incineration boiler 1, a cooling chamber 2, a high-temperature resistant flexible metal membrane bag-type gas-solid separator 3, a quenching tower 4, a packed absorption tower 5, an alkali washing tower 6, a flue gas heater 7, an SCR denitrification device 8, an air preheater 9, an economizer 10, a bag filter 11, an induced draft fan 12 and a chimney 13, which are arranged in sequence. The U-shaped incineration boiler 1 and the cooling chamber 2 are connected to the steam drum 14.

[0035] The U-shaped incineration boiler 1 uses a low-nitrogen combustion method in which one side of the U-shaped incineration boiler 1 performs cracking and gasification of the organic high-nitrogen, phosphorus-containing and salt-containing waste liquid of adiponitrile, and the other side performs high-temperature incineration of the cracking gasification gas, thereby avoiding the generation of a large amount of nitrogen oxides by direct combustion, greatly reducing the equipment investment and operating costs for the post-stage environmental protection denitration treatment of flue gas, and making the entire system more economical. The U-shaped incineration boiler 1 is a membrane wall structure lined with refractory castables, which can prevent the wear of the membrane wall by heavy metals and reduce the heat absorption of the membrane wall, which is conducive to maintaining the temperature in the incineration boiler. A combined burner is arranged on the top of the U-shaped incineration boiler 1; the combined burner is respectively connected to the combustion-supporting air pipeline, the natural gas pipeline and the waste liquid buffer tank 17. Specifically, the combustion-supporting air pipeline is connected to the combined burner through a primary fan 23; the waste liquid buffer tank 17 is connected to the waste liquid spray gun of the combined burner through a waste liquid booster pump 26. The middle of the furnace of the U-shaped incineration boiler 1 is connected to the secondary fan 24. The ash hopper at the bottom of the U-shaped incineration boiler 1 is connected to the water-cooled first scraper conveyor 19 to send the heavy metals in the waste liquid to the packaging workshop for packaging and storage.

[0036] The cooling chamber 2 is a membrane wall structure. An SNCR spray gun is arranged at the inlet of the cooling chamber 2, and the ammonia buffer tank 18 is connected to the SNCR spray gun through an SNCR ammonia spray pump 32.

[0037] A steam-water separation device is provided in the steam drum 14, and the saturated steam outlet of the steam drum 14 is connected to the steam cylinder 15, and the outlet of the steam cylinder 15 is respectively connected to the thermal deaerator 16 and the steam pipe network. The thermal deaerator 16 is connected to the refrigerant inlet of the economizer 10 through the boiler feed water pump 27, and the refrigerant outlet of the economizer 10 is connected to the steam drum 14.

[0038] The flue gas inlet of the high-temperature resistant flexible metal membrane bag type gas-solid separator is connected to the flue gas outlet of the cooling chamber; the flue gas outlet of the high-temperature resistant flexible metal membrane bag type gas-solid separator is connected to the flue gas inlet of the quenching tower; the ash outlet of the high-temperature resistant flexible metal membrane bag type gas-solid separator is connected to the water-cooled second scraper conveyor 20.

[0039] The resource-based environmental protection treatment system for the salt-containing, high-nitrogen and phosphorus-containing adiponitrile organic waste liquid also includes a circulation pool, in which a circulating cooling water coil is arranged, and the circulating cooling water coil is connected to the circulating cooling water pipeline in the plant area; the shell side of the circulation pool is connected to the quenching tower 4 through the quenching tower spray pump 28; the shell side of the circulation pool is connected to the packed absorption tower 5 through the absorption tower spray pump 29.

[0040] The packing absorption tower 5 is provided with packing, and a spray layer is provided on the packing layer.

[0041] A storage tank is arranged at the bottom of the alkali washing tower 6, in which alkali solution is prepared, and the storage tank is connected to the alkali washing tower 6 through the alkali washing tower spray pump 30. A two-layer folding plate demister is arranged on the top of the alkali washing tower 6, which can collect large particle droplets carried in the flue gas and improve the operating conditions of subsequent devices.

[0042] An ammonia spray gun is arranged at the inlet of the SCR denitration device 8, and the ammonia buffer tank 18 is fed into the static mixer through the first SCR ammonia spray pump 31, and the outlet of the static mixer is connected to the ammonia spray gun.

[0043] The process flow of the environmental protection treatment system for the salt-containing, high-nitrogen-containing and phosphorus-containing adiponitrile organic waste liquid resource:

[0044] The organic waste liquid is first sent to the waste liquid buffer tank 17 for temporary storage to stabilize the flow and pressure, and then pressurized by the waste liquid booster pump 26 to the combined burner waste liquid spray gun, and sprayed into the U-shaped incineration boiler 1 by pressure atomization or medium atomization. At the same time, natural gas is sent to the combined burner through a pipeline, and the combustion-supporting wind is sent to the combined burner by the primary fan 23. Most of the organic components in the adiponitrile waste liquid contain nitrogen. If a conventional combustion method is adopted, 15% to 30% of the nitrogen in the waste liquid will be converted into nitrogen oxides, which will lead to the need to arrange a multi-stage denitration device in the future, which not only increases equipment investment, but also consumes a large amount of ammonia water and increases operating costs. This system adopts a low-nitrogen combustion method, with graded air supply. The primary fan only supplements part of the air, and the furnace is oxygen-deficient combustion. Due to the lack of oxygen, only a very small amount of nitrogen is oxidized into nitrogen oxides. Due to the lack of oxygen, organic matter cannot be completely burned, generating carbon monoxide, hydrogen and methane. Secondary air is supplemented at appropriate positions in the furnace, provided by the secondary fan 24. The supplemented air reacts with the incompletely burned carbon monoxide, hydrogen and methane to burn out the organic matter. Most of the organic matter in the waste liquid is converted into nitrogen during oxygen-deficient combustion. Although there is sufficient oxygen when the secondary air is supplemented, fuel-type nitrogen oxides will not be produced. The incineration boiler is a membrane wall structure with an inner lining of refractory castables, which can prevent the heavy metals from wearing the membrane wall and reduce the heat absorption of the membrane wall, which is beneficial to maintaining the temperature in the incineration boiler. The heavy metals in the waste liquid fall from the ash hopper at the bottom of the U-shaped incineration boiler 1 and enter the first drum cooler 21 for cooling. The cooled heavy metals enter the water-cooled first scraper conveyor 19 and are sent to the packaging workshop for packaging and storage.

[0045] By controlling the combustion amount of natural gas, the flue gas temperature at the outlet of the U-type incineration boiler 1 is ensured to be not less than 1100°C, and then enters the cooling chamber 2. The cooling chamber 2 is a membrane wall structure. The high-temperature flue gas exchanges heat with the boiler water in the membrane wall tube in the cooling chamber 2 to produce a steam-water mixture, which is sent to the steam drum 14 through the outlet pipe. A steam-water separation device is set in the steam drum to separate the saturated steam and send it to the steam cylinder 15 through a pipeline to be divided into two streams, one to the thermal deaerator 16, and the other to the steam pipe network. The flue gas is cooled to 500°C to 600°C in the cooling chamber 2. The salts carried in the flue gas fall from the ash hopper at the bottom of the cooling chamber 2 and enter the second drum cooler 22. The cooled salts enter the water-cooled second scraper conveyor 20 and are sent to the packaging workshop for packaging and storage. An SNCR spray gun is set at the entrance of the cooling chamber 2. Ammonia water is sent to the ammonia buffer tank 18 through a pipeline, and is sent to the SNCR spray gun through the SNCR ammonia spray pump 32, and sprayed into the flue gas to reduce nitrogen oxides to nitrogen. The desalted water is sent to the thermal deaerator 16 through a pipeline, and after deoxygenation, it is sent to the economizer 10 by the boiler feed water pump 27. After preheating in the economizer 10, it is sent to the steam drum 14, and distributed to the heating surfaces of the U-shaped incineration boiler 1 and the cooling chamber 2 through the downcomer, and exchanges heat with the high-temperature flue gas to produce a steam-water mixture.

[0046] The flue gas enters the high temperature resistant flexible metal membrane bag type gas-solid separator 3 through the flue from the outlet of the cooling chamber 2. The salts carried in the flue gas are collected again by the high temperature resistant flexible metal membrane bag type gas-solid separator 3 and fall into the water-cooled second scraper conveyor 20, and are sent out of the boundary area for packaging.

[0047] The phosphorus element in the waste liquid generates phosphorus pentoxide during the incineration process, with a melting point of 340°C and a boiling point of 360°C. It is still in a gaseous state at the outlet of the cooling chamber 2. The flue gas enters the quench tower 4 through the flue from the outlet of the high-temperature flexible metal membrane bag-type gas-solid separator 3. The circulating liquid is extracted from the circulation pool by the quench tower spray pump 28 and sprayed into the quench tower 4 after being atomized. The circulating liquid evaporates and absorbs heat in the high-temperature flue gas, and the flue gas temperature is reduced to below 200°C within a time of <1s, thereby curbing the generation of dioxin-like substances. The flow rate or number of the quench tower spray pump 28 is adjusted to control the flue gas temperature at the outlet of the quench tower 4 to be lower than 80°C. At this time, the phosphorus pentoxide in the flue gas dissolves in hot water to generate orthophosphoric acid, which flows back into the circulation pool. The flue gas coming out of the quench tower 4 enters the packed absorption tower 5, in which packing is arranged, and a spray layer is arranged on the packing layer. The circulating liquid is extracted from the circulation pool by the absorption tower spray pump 29 and atomized and sprayed into the packed absorption tower 5. The filler increases the contact area between the flue gas and the circulating liquid, and can collect the phosphorus pentoxide escaping from the quench tower 4 with the flue gas to generate orthophosphoric acid, which is then returned to the circulation pool. The reaction formula for the reaction of phosphorus pentoxide and water to generate orthophosphoric acid is as follows:

[0048] P2O5+3H2O(heat)→2H3PO4+heat

[0049] Add alkali solution to the circulation pool to neutralize phosphoric acid into sodium phosphate. When the sodium phosphate concentration reaches saturation, crystals will precipitate. The sodium phosphate crystals can be fished out and recycled. The circulating liquid can be circulated continuously. In principle, this system does not produce deacidification waste liquid. The neutralization reaction formula is as follows:

[0050] H3PO4+3NaOH=Na3PO4+3H2O

[0051] A circulating cooling water coil is installed in the circulating pool, and the circulating cooling water from the plant area is used to cool the circulating liquid in the circulating pool so that the temperature of the circulating liquid is lower than 60°C.

[0052] After the flue gas comes out of the packing absorption tower, it enters the alkali washing tower 6. A storage tank is set at the bottom of the alkali washing tower 6. Alkali solution is prepared in the storage tank. The alkali solution in the storage tank is extracted by the alkali washing tower spray pump 30 for spraying, and the escaped phosphorus pentoxide and other acidic gases are collected to make up for the flue gas emission. After the liquid level in the storage tank at the bottom of the alkali washing tower 6 rises or the pH of the circulating liquid drops to the set value, the circulating liquid is discharged into the neutralization tank and the alkali solution is re-prepared. A two-layer folding plate demister is set at the top of the alkali washing tower 6 to collect large particle droplets carried in the flue gas and improve the operating conditions of the subsequent devices.

[0053] After the flue gas undergoes two-stage denitration, namely low-nitrogen combustion and SNCR denitration, an SCR denitration device 8 is provided to ensure that the emission of nitrogen oxides meets the standard. After the flue gas comes out of the alkali scrubber 6, it enters the flue gas heater 7, where the flue gas temperature is raised to about 220°C by burning natural gas, and then enters the SCR denitration device 8. The air required for combustion is provided by the flue gas heater fan 25, and participates in the combustion after being heated by the air preheater 9, which can save the natural gas consumption of the flue gas heater 7. An ammonia spray gun is provided at the entrance of the SCR denitration device 8, and the required ammonia is extracted from the ammonia buffer tank 18 by the SCR ammonia spray pump 31, and is diluted to the required concentration by the static mixer and then sprayed into the flue gas, where it reacts with the nitrogen oxides in the flue gas under the action of the catalyst to reduce the nitrogen oxides to nitrogen.

[0054] After the flue gas comes out of the SCR denitration device 8, it passes through the air preheater 9 and the economizer 10 in sequence to further reduce the temperature and recover heat, and then enters the bag filter 11 to collect the particulate matter carried in the flue gas, and finally is sent to the chimney 13 through the induced draft fan 12 and discharged into the atmosphere. At this time, the heavy metals, salts, acid gases and nitrogen oxides in the flue gas can meet the national standards.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A system for recycling and environmentally friendly treatment of salt-containing, high-nitrogen and phosphorus-containing adiponitrile organic waste liquid, characterized in that: include: A U-shaped incineration boiler (1), a cooling chamber (2), a high temperature resistant flexible metal membrane bag type gas-solid separator (3), a quenching tower (4), a packed absorption tower (5), an alkali washing tower (6), a flue gas heater (7), an SCR denitration device (8), an air preheater (9), an economizer (10), a bag filter (11), an induced draft fan (12) and a chimney (13) are arranged in sequence, wherein the U-shaped incineration boiler (1) and the cooling chamber (2) are connected to a steam drum (14); The U-shaped incineration boiler (1) has a gasification chamber on one side and a high-temperature incineration chamber on the other side, the gasification chamber and the high-temperature incineration chamber being separated by a membrane-type water-cooled wall partition; a combined burner is arranged on the top of the gasification chamber, the combined burner is respectively connected to the primary fan (23), the combustion-supporting air pipeline, the natural gas pipeline and the waste liquid buffer tank (17); the middle of the furnace of the U-shaped incineration boiler (1) is connected to the secondary fan (24); The cooling chamber is a membrane wall structure, and a membrane wall-mounted panel heating surface is arranged in the cooling chamber; the membrane wall-mounted panel heating surface arranged in the cooling chamber is composed of a plurality of membrane wall tube panels, and forms a closed circulation loop with the boiler drum through pipelines; the U-shaped incineration boiler (1) and the cooling chamber (2) with the built-in L-shaped panel heating surface are in an inverted "U" shape, and the U-shaped incineration boiler (1) and the cooling chamber (2) with the built-in L-shaped panel heating surface are connected at the top through a connecting flue.

2. The resource-based environmental protection treatment system for salt-containing, high-nitrogen and phosphorus-containing adiponitrile organic waste liquid according to claim 1 is characterized in that: An SNCR spray gun is provided at the inlet of the cooling chamber (2), and the ammonia buffer tank (18) is connected to the SNCR spray gun via an SNCR ammonia spray pump (32).

3. The resource-based environmental protection treatment system for salt-containing, high-nitrogen and phosphorus-containing adiponitrile organic waste liquid according to claim 1 is characterized in that: A steam-water separation device is arranged in the steam drum (14); the saturated steam outlet of the steam drum (14) is connected to a steam sub-cylinder (15); and the outlet of the steam sub-cylinder (15) is respectively connected to a thermal deaerator (16) and a steam pipe network.

4. The resource-based environmental protection treatment system for salt-containing, high-nitrogen and phosphorus-containing adiponitrile organic waste liquid according to claim 3 is characterized in that: The thermal deaerator (16) is connected to the refrigerant inlet of the economizer (10) via a boiler feed water pump (27), and the refrigerant outlet of the economizer (10) is connected to the steam drum (14).

5. The resource-based environmental protection treatment system for salt-containing, high-nitrogen and phosphorus-containing adiponitrile organic waste liquid according to claim 1 is characterized in that: It comprises a high temperature resistant flexible metal film bag type gas-solid separator (3), wherein the smoke inlet of the high temperature resistant flexible metal film bag type gas-solid separator (3) is connected to the smoke outlet of the cooling chamber (2); the smoke outlet of the high temperature resistant flexible metal film bag type gas-solid separator (3) is connected to the smoke inlet of the quenching tower (4); and the ash outlet of the high temperature resistant flexible metal film bag type gas-solid separator (3) is connected to a water-cooled second scraper conveyor (20).

6. The resource-based environmental protection treatment system for salt-containing, high-nitrogen and phosphorus-containing adiponitrile organic waste liquid according to claim 1 is characterized in that: The invention comprises a circulation pool, wherein a circulation cooling water coil is arranged in the circulation pool, and the circulation cooling water coil is connected to the circulating cooling water pipeline of the plant area; the shell side of the circulation pool is connected to the quenching tower (3) through the quenching tower spray pump (28); the shell side of the circulation pool is connected to the packed absorption tower (5) through the absorption tower spray pump (29).

7. The resource-based environmental protection treatment system for salt-containing, high-nitrogen-containing and phosphorus-containing adiponitrile organic waste liquid according to claim 1 is characterized in that: A storage tank is provided at the bottom of the alkali washing tower (6), in which alkali solution is prepared, and the storage tank is connected to the alkali washing tower (6) via an alkali washing tower spray pump (30).

8. The resource-based environmental protection treatment system for salt-containing, high-nitrogen-containing and phosphorus-containing adiponitrile organic waste liquid according to claim 1, characterized in that: An ammonia spray gun is provided at the inlet of the SCR denitration device (8), and the ammonia buffer tank (18) is fed into the static mixer through the SCR ammonia spray pump (31), and the static mixer outlet is connected to the ammonia spray gun.

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