A device for the directed conversion of high-salt phosphorus-containing organic waste liquid of glyphosate (amine)

Abstract

The application discloses a device for directional conversion of glyphosate high-salt phosphorus-containing organic waste liquid, and relates to the technical field of glyphosate wastewater treatment, comprising a directional conversion part, a high-temperature incineration part, a waste heat recovery part, a flue gas quenching part, a flue gas dust removal part, a flue gas deacidification part, a flue gas denitration part, a chimney, and a sodium pyrophosphate recovery part; the vertical constant-temperature furnace is provided with waste liquid top spraying, and a plurality of natural gas burners are arranged in layers to ensure uniform combustion temperature; the vertical constant-temperature furnace, the horizontal constant-temperature furnace and the flue constitute a U-shaped directional conversion structure, the directional conversion time is prolonged, and the conversion efficiency is improved; the secondary combustion chamber is arranged on the top of the waste heat boiler to avoid molten salt from blocking the flue; air is supplied to the bottom of the beam type chain grate to ensure that the TOC content of the recovered inorganic salt is close to zero; the application does not generate sewage and solid waste, flue gas emission meets environmental protection requirements, waste reduction, harmlessness and resource utilization are realized, the sustainable development of pollution-type industries is promoted, the competitiveness of enterprises and industries is improved, and technical progress and industry technology leap are realized.

Description

Technical Field

[0001] This invention relates to the field of glyphosate wastewater treatment technology, specifically to a directional conversion device for high-salt, phosphorus-containing organic wastewater containing glyphosate. Background Technology

[0002] Directed conversion of phosphorus-containing concentrated mother liquor is a treatment technology that converts phosphorus and sodium elements in the mother liquor into sodium pyrophosphate at high temperatures. It involves oxidizing and burning a certain amount of excess air, natural gas, and phosphorus-containing concentrated mother liquor in a primary combustion chamber. The water in the phosphorus-containing concentrated mother liquor evaporates, organic waste is incinerated, inorganic salts are precipitated, and phosphorus and sodium elements are converted into sodium pyrophosphate. It is the most effective and thorough treatment technology that can simultaneously achieve the harmlessness, volume reduction, and resource recovery of waste.

[0003] The purpose of targeted conversion is to maximize the conversion of waste into valuable resources, transforming phosphorus and sodium elements in the mother liquor into sodium pyrophosphate, while simultaneously incinerating as much waste as possible from the mother liquor, rendering the incinerated substances harmless, and minimizing volume reduction to reduce the generation of new pollutants and avoid secondary pollution. For targeted conversion of phosphorus-containing concentrated mother liquor, three objectives can be achieved simultaneously: recovering valuable substances from the mother liquor, completely incinerating toxic and harmful substances, and recovering and utilizing the waste heat generated during incineration. High-temperature targeted conversion, as an effective and simple method for disposing of phosphorus-containing concentrated mother liquor, is increasingly being adopted by the chemical industry, and the design of targeted conversion equipment has become an important part of chemical engineering design.

[0004] The reaction between natural gas and organic matter in mother liquor during combustion is an exothermic reaction. During normal combustion, a combustion fan is required to supply air and oxygen to complete the oxidative decomposition of organic matter. To ensure the high-temperature combustion of organic matter, a sufficient amount of air should be provided.

[0005] In existing technologies, due to the characteristics of phosphorus-containing concentrated mother liquor, such as high water content, low calorific value, and the presence of a large amount of low-melting-point sodium salts, processing it using a high-temperature directional conversion device presents the following challenges:

[0006] (1) Phosphorus-containing concentrated mother liquor has high water content and low calorific value, poor combustion conditions, and organic matter is difficult to burn completely. Conventional incineration requires a large amount of auxiliary fuel, resulting in high energy consumption.

[0007] (2) For devices that process sodium salts, incineration will form metallic salts, which have a lower ash melting point (approximately 800℃) and extremely strong high-temperature adhesion compared to the ash from traditional coal-fired boilers. Furthermore, molten sodium salts are highly corrosive to the refractory materials in the combustion chamber, resulting in erosion of the furnace lining and shortening its lifespan. The boiler heating surfaces are prone to ash accumulation and blockage, preventing the directional conversion device from operating safely and stably for extended periods.

[0008] (3) The concentrated mother liquor containing phosphorus has a high salt content, high viscosity, and is prone to crystallization. It is necessary to consider how to transport and effectively atomize it into the furnace.

[0009] (4) The phosphorus-containing concentrated mother liquor contains organic nitrogen, which will form fuel-type NOx when burned at high temperature. The directional conversion unit needs to take into account dust removal, denitrification and deacidification treatment in order to ensure that the flue gas emissions of the entire unit meet the national environmental protection standards.

[0010] A glyphosate mother liquor resource utilization system, with application number CN2015107208749, includes a mother liquor concentration system, a thermal oxidation reaction system, a waste heat recovery system, a flue gas environmental protection treatment system, and a solid product recovery system. The mother liquor concentration system is connected to the thermal oxidation reaction system and the waste heat recovery system, the thermal oxidation reaction system is connected to the waste heat recovery system and the solid product recovery system, the waste heat recovery system is connected to the flue gas environmental protection treatment system and the solid product recovery system, and the flue gas environmental protection treatment system is connected to the solid product recovery system. Although this invention is also used for the resource utilization of glyphosate mother liquor, it still has some defects: (1) The waste liquid spray gun is arranged in the middle of the vertical constant temperature furnace, and the flue gas outlet is located at the top of the vertical constant temperature furnace. The waste injection point is too close to the flue gas outlet. The waste enters the subsequent equipment with the flue gas before it is completely burned, resulting in incomplete waste incineration, causing blockage of the subsequent equipment and excessive flue gas emissions; (2) Glyphosate (amine) mother liquor contains chlorine. According to national standards, the waste heat of flue gas between 500℃ and 200℃ should not be recovered. A quench tower should be set up to cool the flue gas within 1 second to avoid the formation of dioxins. (3) The denitrification device should be placed after the dust removal and deacidification system. If the sulfur content in the flue gas exceeds the standard, it will easily lead to poisoning of the denitrification catalyst; if the dust content exceeds the standard, it will easily lead to blockage of the denitrification catalyst. (4) After the flue gas is cooled by spraying alkali in the flue gas deacidification system, it is directly discharged. The flue gas temperature is below 80℃, and white plumes are easily generated when the flue gas is discharged to the chimney.

[0011] The application number 201110087331X is for the incineration treatment device for waste gas and wastewater containing glyphosate and bisphosphonate, including an incinerator, a waste gas supply system, a wastewater supply system and a waste heat recovery system connected to the incinerator, the waste heat recovery system connected to a cyclone dust removal system, and the cyclone dust removal system connected to a flue gas post-treatment system; Although this application is also for the treatment of phosphorus-containing waste liquid, it still has some defects: (1) Waste liquid spray guns are arranged in the middle of the incinerator, and the flue gas outlet is located at the top of the incinerator. The waste injection point is close to the flue gas outlet. The waste enters the subsequent equipment with the flue gas before it is completely burned, resulting in incomplete waste incineration, causing blockage of the subsequent equipment and excessive flue gas emissions; (2) Bisphosphonate and glyphosate mother liquor contain chlorine. According to national standards, the waste heat of flue gas between 500℃ and 200℃ should not be recovered. A quench tower should be set up to cool the flue gas within 1 second to avoid the generation of dioxins. (3) Glyphosate and glyphosate contain nitrogen, so denitrification devices should be installed to remove nitrogen oxides from the flue gas; otherwise, nitrogen oxide emissions from the flue gas are likely to exceed the standard. (4) The separation efficiency of cyclone separators is generally around 90%, which is lower than that of bag filters. The dust removal efficiency of bag filters can usually reach over 99%, or even higher. For fine dust with submicron particle size, even with multi-stage cyclone separators, the dust removal efficiency is still not as good as that of bag filters. (5) After the flue gas is cooled by alkali spraying in the flue gas deacidification system, it is directly discharged. If the flue gas temperature is below 80℃, white plumes are likely to appear when the flue gas is discharged to the chimney. Summary of the Invention

[0012] The purpose of this invention is to provide a directional conversion device for high-salt, phosphorus-containing organic wastewater containing glyphosate (amine) to address the problems mentioned in the background art. These problems include the high energy consumption resulting from the need for large amounts of auxiliary fuel during conventional incineration when treating phosphorus-containing wastewater with high-temperature directional conversion devices; the formation of metallic salts after incineration when the wastewater contains sodium salts, which have a lower ash melting point (approximately 800°C) and extremely strong high-temperature adhesion compared to ash from traditional coal-fired boilers. Furthermore, molten sodium salts are highly corrosive to the refractory materials in the combustion chamber, eroding the furnace lining and shortening its lifespan. The boiler heating surfaces are prone to ash accumulation and blockage, preventing the directional conversion device from operating safely and stably for extended periods. Additionally, the phosphorus-containing concentrated mother liquor contains organic nitrogen, which forms fuel-type NOx upon high-temperature incineration, necessitating the directional conversion device to address issues such as dust removal, denitrification, and deacidification.

[0013] To achieve the above objectives and overcome the shortcomings of the prior art, the present invention provides the following technical solution: a glyphosate (amine) high-salt phosphorus-containing organic waste liquid directional conversion device, comprising a directional conversion section and subsequently connected via a flue to a high-temperature incineration section, a waste heat recovery section, a flue gas quenching section, a flue gas dust removal section, a flue gas deacidification section, a flue gas denitrification section, and a chimney; the directional conversion section, the high-temperature incineration section, the waste heat recovery section, the flue gas quenching section, and the flue gas dust removal section are all connected to a sodium pyrophosphate recovery section; the directional conversion section includes a primary combustion chamber and its respective connected waste liquid atomization section, a combustion air section, and a natural gas incineration section. The system comprises: a combustion section; a high-temperature incineration section including a high-temperature cyclone separator and a secondary combustion chamber; a waste heat recovery section including a waste heat boiler and a waste heat boiler drum; a flue gas quenching section including a quenching tower; a flue gas dust removal section including a bag filter; a flue gas deacidification section including a deacidification tower; a flue gas denitrification section including a flue gas heater and an SCR denitrification reactor connected to its bottom; and a sodium pyrophosphate recovery section including a coarse crusher, a first water-cooled scraper conveyor, a second water-cooled scraper conveyor, a fine crusher, a screw conveyor, a first bucket elevator, a drum cooler, a second bucket elevator, an automatic baler, and a twin-shaft crusher.

[0014] Preferably, the primary combustion chamber includes a vertical constant-temperature furnace and a horizontal constant-temperature furnace at its bottom; the waste liquid atomization section includes one or more waste liquid spray guns arranged at the center of the top of the vertical constant-temperature furnace and connected to a phosphorus-containing concentrate booster pump, a waste liquid transfer pump, and a waste liquid buffer tank; the combustion air section includes multiple combustion air nozzles arranged around the waste liquid spray guns and connected to combustion air fans; the natural gas combustion section includes three layers of natural gas burners arranged from top to bottom in the vertical constant-temperature furnace, with two or four burners in each layer arranged in a staggered arrangement; the bottom of the horizontal constant-temperature furnace is provided with a beam-type chain grate and cooled by a grate fan. Multiple air distribution points are used for oxygen supply and cooling at the bottom of the grate. Several ash hoppers are arranged side by side along its axis below, and ash collection pipes are installed at the bottom of the ash collection pipes. The bottom ends of the ash collection pipes are connected to the sodium pyrophosphate recovery section. Temperature sensors are installed on the side walls of the vertical constant temperature furnace and linked to the natural gas burners on it. Temperature sensors are also installed on the horizontal constant temperature furnace and linked to the natural gas burners on it. A flue gas outlet is provided at the top of the end of the horizontal constant temperature furnace and connected to the high-temperature combustion section through a flue. The vertical constant temperature furnace, the horizontal constant temperature furnace and the flue connected to the high-temperature combustion section form a "U"-shaped combustion structure.

[0015] Preferably, the high-temperature cyclone separator is vertically arranged, with a flue gas outlet at the center of its top that connects to the secondary combustion chamber, and a bottom cone that connects to the sodium pyrophosphate recovery section via an ash collection pipe; the secondary combustion chamber is located directly above the waste heat recovery section, with a flue gas outlet at the center of its bottom that connects vertically downwards to the waste heat recovery section, and four natural gas burners are evenly arranged around its shoulder and connected to the natural gas pipeline network.

[0016] Preferably, the waste heat boiler is a vertical membrane wall structure natural circulation water tube boiler, including a cooling chamber 1 and a cooling chamber 2 connected at the bottom. The top of the cooling chamber 1 is provided with a flue gas inlet, and the side wall of the cooling chamber 2 is provided with a flue gas outlet near the top, which is connected to the flue gas quenching section through a flue. The bottom of both cooling chambers is connected to the sodium pyrophosphate recovery section through an ash collection pipe. The upper header of the waste heat boiler is connected to the waste heat boiler drum through a steam-water outlet pipe, and a steam outlet is provided at the top of the drum, which is connected to a steam distribution cylinder. The steam distribution cylinder is connected to the steam network and the thermal deaerator through two outlet pipes, respectively. The bottom of the thermal deaerator is connected to a boiler feedwater pump and then to the waste heat boiler drum. The top of the waste heat boiler drum is provided with a chemical dosing port, which is connected to a chemical dosing tank and a demineralized water pipe in sequence. The bottom is provided with a sewage discharge pipe, which is connected to a sewage tank through a sewage discharge expander. The soot blower is located on one side wall of the cooling chamber and is connected to a compressed air buffer tank.

[0017] Preferably, the quench tower has a flue gas inlet at the top, a bottom ash collection pipe connecting it to the sodium pyrophosphate recovery unit, and a flue gas outlet near the bottom on the side wall connected to the flue gas dust removal unit; a quench atomizing spray gun is arranged at the flue gas inlet of the quench tower; the quench atomizing spray gun is connected to the quench water spray pump and the compressed air buffer tank through pipelines; the quench water spray pump is connected to the quench water tank and the industrial water pipe in sequence through pipelines.

[0018] Preferably, the baghouse dust collector has a flue gas inlet at the lower part of its side wall, a bottom section connected to the sodium pyrophosphate recovery section via two sets of ash collection pipes, and a flue gas outlet at the top of the side wall opposite the flue gas inlet, connected to the flue gas desulfurization section. The flue between the baghouse dust collector and the quench tower is connected to an activated carbon injector and a quicklime injector via branch pipes. The inlet of the activated carbon injector is connected in sequence to a feeder, an activated carbon injection fan, and an activated carbon storage tank via pipes. The inlet of the quicklime injector is connected in sequence to a feeder, a quicklime injection fan, and a quicklime storage tank via pipes. A gas distribution box is located above the side wall of the baghouse dust collector and connected to a compressed air buffer tank. The filter bags of the baghouse dust collector are made of PTFE material, with a filter velocity of 0.6–0.7 m / min, and the dust concentration in the filtered flue gas is ≤10 mg / Nm³. 3 .

[0019] Preferably, the deacidification tower is provided with, from top to bottom, a demisting layer and a clear water spray layer connected to industrial water pipes on its upper and lower sides, multiple deacidification spray layers, and a deacidification circulating liquid storage tank. A flue gas outlet is located at the top center and connected to the flue gas denitrification section via a flue. A flue gas inlet is located on the side wall between the deacidification spray layers and the deacidification circulating liquid storage tank. A deacidification circulating liquid outlet is located at the bottom of the side wall of the deacidification circulating liquid storage tank and connected to a sedimentation tank via a pipe. The sedimentation tank is sequentially connected to a neutralization tank and a clear water tank. The sedimentation tank is connected to a sewage pump. The neutralization tank is connected to a sodium hydroxide dosing device, and the pH value of the circulating acid in the clear water tank is controlled to be 7-9 by adding sodium hydroxide solution to the neutralization tank. The clear water tank is connected to a deacidification circulating spray pump, which is connected to the deacidification spray layer via a pipe. The clear water tank is also connected to a water supply pipe, which is connected to the industrial water network.

[0020] Preferably, the flue gas heater has a tangential flue gas inlet at the top of its sidewall and is connected to the flue gas outlet of the desulfurization tower via an induced draft fan; a flue gas outlet at the bottom is directly connected to the upper part of the SCR denitrification reactor; a natural gas burner is located at the center of the top; a denitrification atomizing spray gun is located near the bottom inside the flue gas heater; the denitrification atomizing spray gun is connected to a compressed air storage tank and an ammonia spray pump via pipelines; and the ammonia spray pump is connected to the ammonia storage tank via a pipeline. The bottom sidewall of the SCR denitrification reactor has a flue gas outlet connected to a chimney via a flue. The induced draft fan uses circulating cooling water to cool the fan bearings and lubricating oil.

[0021] Preferably, the coarse crusher is located below the end of the crossbeam chain grate, and a twin-shaft crusher is located below it and connected to a second water-cooled scraper conveyor. The first water-cooled scraper conveyor receives sodium pyrophosphate dust separated by the bag filter, and the second water-cooled scraper conveyor receives sodium pyrophosphate generated by the directional conversion section, high-temperature incineration section, waste heat recovery section, and flue gas quenching section, as well as sodium pyrophosphate dust without activated carbon and quicklime powder scraped by the first water-cooled scraper conveyor. A fine crusher is located below its discharge end, and a screw conveyor, a first bucket elevator, a drum cooler, a second bucket elevator, an ash storage silo, and an automatic baler are sequentially arranged at the outlet of the fine crusher.

[0022] The above-mentioned glyphosate (amine) high-salt phosphorus-containing organic waste liquid directional conversion device converts the high-salt phosphorus-containing waste liquid into sodium pyrophosphate byproduct through a constant-temperature incineration reaction, which is then recycled and reused. The high-temperature flue gas is discharged after waste heat recovery and environmental protection treatment. The device is characterized by the following steps:

[0023] The first step involves injecting high-concentration waste liquid from the waste liquid buffer tank into the top of a vertical constant-temperature furnace after atomization by a waste liquid transfer pump, a phosphorus-containing concentrate booster pump, and a waste liquid spray gun. Multiple natural gas burners assist in combustion with natural gas, controlling the combustion temperature to 650℃~750℃, resulting in the directional conversion into sodium pyrophosphate. Unburned organic matter, incompletely converted phosphorus and sodium elements, and partially converted sodium pyrophosphate fall onto a horizontal constant-temperature furnace via a beam-type chain grate at the bottom of the primary combustion chamber, achieving complete combustion and directional conversion into sodium pyrophosphate. The pyrophosphate is then conveyed by the horizontal constant-temperature furnace beam-type chain grate to the tail ash hopper, where it falls sequentially into a coarse crusher and a twin-shaft crusher. After coarse crushing, it enters a second water-cooled scraper conveyor.

[0024] The second step involves drawing the flue gas from the tail of the horizontal constant temperature furnace through the flue and sending it to the high-temperature cyclone separator for separation. The separated sodium pyrophosphate falls into the second water-cooled scraper conveyor through the ash pipe. The separated flue gas is then sent to the secondary combustion chamber through the flue. The auxiliary fuel is burned by the natural gas burner to raise the temperature of the flue gas to above 1100°C. The high-temperature flue gas above 1100°C is burned in the secondary combustion chamber and stays for more than 2 seconds.

[0025] The third step involves the flue gas from the secondary combustion chamber entering the waste heat boiler to absorb heat and produce saturated steam as a byproduct. After the flue gas temperature drops to 550℃±50℃, it enters the quench tower. Some sodium pyrophosphate will fall into the second water-cooled scraper conveyor through the ash discharge pipe at the bottom of the waste heat boiler.

[0026] In the fourth step, the quench tower rapidly reduces the flue gas temperature from 550℃±50℃ to 180℃~200℃ in less than 1 second by atomizing water spray. At the same time, some sodium pyrophosphate carried in the flue gas is separated by gravity and falls to the bottom of the quench tower, and is transported to the second water-cooled scraper conveyor through the ash collection pipe at the bottom of the quench tower.

[0027] The fifth step involves the flue gas at 180°C to 200°C flowing out of the quench tower entering the bag filter. Simultaneously, activated carbon and quicklime powder are injected into the flue gas through activated carbon and quicklime injectors in the flue gas duct. The bag filter separates and collects the fine sodium pyrophosphate, activated carbon, and quicklime powder carried in the flue gas, and then sends them to a horizontal constant temperature furnace or outsources them for disposal.

[0028] Although the fly ash collected by the bag filter is mainly composed of sodium pyrophosphate, it is classified as hazardous waste due to the presence of activated carbon and quicklime powder. It must be collected separately and sent to a horizontal constant-temperature furnace in the primary combustion chamber for incineration or outsourced for disposal. If activated carbon and quicklime powder are not sprayed, the fly ash can be recycled as a byproduct sodium pyrophosphate by the first water-cooled scraper conveyor 902 to the second water-cooled scraper conveyor 903.

[0029] The sixth step is to send the dust-removed flue gas to the desulfurization tower through the flue, where SO2 and HCl gases carried in the flue gas are removed by circulating alkaline solution spraying; the temperature of the flue gas discharged from the desulfurization tower is reduced to 60-80℃.

[0030] Step 7: After dust removal and acid removal, the flue gas is sent to the flue gas heater by the induced draft fan. The flue gas temperature is heated to above 220°C by burning natural gas and then enters the SCR denitrification reactor. Ammonia water is sprayed as a reducing agent and denitrification is carried out under the catalytic action of the catalyst built into the SCR denitrification reactor.

[0031] Step 8: The denitrified flue gas is sent through the flue to the chimney for direct emission.

[0032] In the ninth step, the second water-cooled scraper conveyor transports the sodium pyrophosphate from the primary combustion chamber, high-temperature cyclone separator, waste heat boiler, and quench tower, as well as the sodium pyrophosphate without activated carbon and quicklime powder from the first water-cooled scraper conveyor, to the fine crusher. The finely crushed sodium pyrophosphate powder is then fed into the drum cooler via a screw conveyor and the first bucket elevator for cooling. After cooling, the sodium pyrophosphate is transported by the second bucket elevator to the automatic packaging machine for packaging and storage. At the same time, a small bag filter and an exhaust fan are installed to create a negative pressure environment in the workshop containing the above-mentioned conveying equipment to prevent the spilled sodium pyrophosphate powder from polluting the environment.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] 1. This invention employs a method of arranging waste liquid spray guns at the top of a vertical constant temperature furnace with multiple natural gas burners arranged in layers on the side, which ensures uniform combustion temperature within the furnace chamber and avoids the phenomenon of molten salt agglomeration due to excessively high local temperatures or unburned conditions due to excessively low temperatures.

[0035] 2. The present invention sets up a vertical constant temperature furnace and a horizontal constant temperature furnace in the directional conversion section to form a "U"-shaped structure with the flue connected to the high-temperature incineration section, which prolongs the reaction time of sodium pyrophosphate directional conversion. This allows the sodium and phosphorus in the waste liquid to fully react and be directionally converted into sodium pyrophosphate before falling into the sodium pyrophosphate recovery section. The flue gas gradually separates from the sodium pyrophosphate during operation and then enters the high-temperature incineration section.

[0036] 3. In this invention, the secondary combustion chamber is located at the top of the waste heat boiler. Flue gas containing carbon monoxide and unburned gases undergoes complete combustion within the secondary combustion chamber, with a reaction time > 2 seconds. The inorganic salts carried in the flue gas enter the waste heat boiler in a molten state. Under the cooling effect of the boiler's heating surfaces, they transform from a liquid to a solid state and enter the sodium pyrophosphate recovery section. This arrangement eliminates the need for a connecting flue between the secondary combustion chamber and the waste heat boiler, reducing the risk of molten salt sticking to the flue. It also eliminates the need for molten salt cooling equipment, avoiding blockages and saving on equipment investment costs.

[0037] 4. The bottom of the horizontal constant temperature furnace of this invention adopts a crossbeam chain grate. On the one hand, the inorganic salts falling on the grate are roasted by the natural gas burners arranged on the side wall of the horizontal constant temperature furnace to ensure that the directional conversion process is sufficient. On the other hand, the air distribution at the bottom of the grate can cool the grate to ensure the safe operation of the grate. Moreover, the organic components between the directionally converted inorganic salts on the grate fully combine with the oxygen in the air distribution to generate carbon dioxide and burn out, ensuring that the TOC content of the recovered directional conversion product inorganic salts is close to zero.

[0038] 5. This invention recovers heat from flue gas and produces saturated steam by means of a waste heat boiler with a "U"-shaped membrane fireplace wall and a built-in "L"-shaped or inverted "U"-shaped membrane wall heating surface. The "U"-shaped membrane fireplace wall and the built-in "L"-shaped or inverted "U"-shaped membrane wall heating surface prevent molten inorganic salts in the flue gas from clogging the flue and heating surface. The use of a long telescopic soot blowing device further prevents the waste heat recovery equipment from clogging and ensures smooth operation.

[0039] 6. This invention generates no wastewater or solid waste, and its flue gas emissions meet national environmental protection standards. It not only achieves environmental protection and energy conservation, but also fully realizes waste reduction, harmlessness, and resource utilization. While addressing environmental issues, it also generates economic and social benefits, promotes the sustainable development of polluting industries, drives industrial restructuring and upgrading, enhances the competitiveness of enterprises and industries, and plays a significant role in achieving technological leaps and promoting technological progress. Attached Figure Description

[0040] Figure 1 This is a flowchart of the present invention;

[0041] Figure 2 This is a schematic diagram of the process of the present invention;

[0042] Figure 3 for Figure 2 Detailed structural diagram;

[0043] In the diagram: Directional conversion section-1, primary combustion chamber-101, waste liquid spray gun-102, phosphorus-containing concentrate booster pump-103, waste liquid transfer pump-104, waste liquid buffer tank-105, combustion air nozzle-106, combustion air fan-107, natural gas burner-108, temperature sensor-109, crossbeam chain grate-110, grate cooling fan-111, ash hopper-112, ash pipe-113, high-temperature incineration section-2, high-temperature cyclone separator-201, secondary combustion chamber-202, waste heat... Recovery Section-3, Waste Heat Boiler-301, Waste Heat Boiler Drum-302, Steam Distributor-303, Thermal Deaerator-304, Boiler Feed Pump-305, Chemical Dosing Tank-306, Sewage Expansion Tank-307, Soot Blower-308, Flue Gas Quenching Section-4, Quenching Tower-401, Quenching Atomizing Spray Gun-402, Quenching Water Spray Pump-403, Quenching Water Tank-404, Flue Gas Dust Removal Section-5, Bag Filter-501, Activated Carbon Injector-502, Quicklime Injector-503, Activated Carbon Injection Fan -504, Activated Carbon Storage Tank -505, Quicklime Spray Blower -506, Quicklime Storage Tank -507, Flue Gas Deacidification Section -6, Deacidification Tower -601, Deacidification Spray Layer -602, Deacidification Circulating Liquid Storage Tank -603, Sedimentation Tank -604, Neutralization Tank -605, Clear Water Tank -606, Sewage Pump -607, Sodium Hydroxide Dosing Section -608, Deacidification Circulating Spray Pump -609, Makeup Water Pipe -610, Demisting Layer -611, Clear Water Spray Layer -612, Flue Gas Denitrification Section -7, Flue Gas Heater -70 1. SCR denitrification reactor - 702. Denitrification atomizing spray gun - 703. Ammonia water spray pump - 704. Ammonia water storage tank - 705. Exhaust fan - 706. Chimney - 8. Sodium pyrophosphate recovery unit - 9. Coarse crusher - 901. First water-cooled scraper conveyor - 902. Second water-cooled scraper conveyor - 903. Fine crusher - 904. Screw conveyor - 905. First bucket elevator - 906. Drum cooler - 907. Second bucket elevator - 908. Automatic baler - 909. Twin-shaft crusher - 910. Detailed Implementation

[0044] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0045] Please refer to Figure 1-3 , Figure 1 This is a flowchart of the present invention; Figure 2 This is a schematic diagram of the process of the present invention; Figure 3 for Figure 2 Detailed structural diagram.

[0046] This invention provides a directional conversion device for high-salt, phosphorus-containing organic waste liquid containing glyphosate (amine)phosphine. The device performs directional conversion on the high-salt, phosphorus-containing waste liquid after high-temperature incineration and recovers the byproducts of the conversion. It includes a directional conversion unit 1 at the front end for directional conversion and incineration of the high-salt, phosphorus-containing waste liquid. The flue gas from the directional conversion unit 1 is introduced into a high-temperature incineration unit 2 through a flue for high-temperature incineration. The flue gas after high-temperature incineration in the high-temperature incineration unit 2 is then introduced into a waste heat recovery unit 3 through a flue for waste heat recovery. The flue gas after waste heat recovery is then introduced into a flue gas quenching unit 4 through a flue for rapid cooling. The flue gas is then introduced into the flue gas dust removal unit 5 through the flue to separate and remove sodium pyrophosphate. After dust removal, the flue gas is introduced into the flue gas deacidification unit 6 through the flue to remove acidic gases such as SO2 and HCl. After deacidification, the flue gas is introduced into the flue gas denitrification unit 7 through the flue and the induced draft fan to reduce nitrogen oxides in the flue gas into nitrogen and water to achieve denitrification. After denitrification, the flue gas is sent into the chimney 8 through the flue for high-altitude emission. The directional conversion unit 1, high-temperature combustion unit 2, waste heat recovery unit 3, flue gas quenching unit 4, and flue gas dust removal unit 5 are all connected to the sodium pyrophosphate recovery unit 9.

[0047] The directional conversion unit 1 includes a primary combustion chamber 101, which includes a vertical constant temperature furnace and a horizontal constant temperature furnace connected to its bottom. A waste liquid spray gun 102 is provided at the center of the top of the vertical constant temperature furnace of the primary combustion chamber 101. The inlet of the waste liquid spray gun 102 is connected to a phosphorus-containing concentrate booster pump 103 through a pipe. The inlet of the phosphorus-containing concentrate booster pump 103 is connected to a waste liquid transfer pump 104 through a pipe. A hot water pipe network is connected to the pipe after the waste liquid transfer pump through a tee for the replacement and unblocking of the waste liquid pipeline to ensure smooth operation. The inlet of the waste liquid transfer pump 104 is connected to a waste liquid buffer tank 105 through a pipe. The waste liquid buffer tank 105 stores high-phosphorus waste liquid with salt content.

[0048] The top of the vertical constant temperature furnace of the primary combustion chamber 101 is provided with multiple combustion air nozzles 106 surrounding the waste liquid spray gun 102. The multiple combustion air nozzles 106 are connected to a combustion air fan 107 through pipes. Natural gas burners 108 are provided on the vertical side wall of the vertical constant temperature furnace of the primary combustion chamber 101 and on the side wall of the horizontal constant temperature furnace of the primary combustion chamber 101. The natural gas burners 108 are connected to the natural gas pipeline network through pipes for supplying natural gas to the vertical and horizontal constant temperature furnaces of the primary combustion chamber 101 for auxiliary combustion. A temperature sensor 109 is provided in the middle of the vertical side wall of the primary combustion chamber 101 and is linked to the natural gas burner 108 on the upper side. A temperature sensor 109 is provided in the middle of the horizontal constant temperature furnace of the primary combustion chamber 101 and is linked to the natural gas burner 108 at the bottom.

[0049] The bottom of the horizontal constant temperature furnace in the primary combustion chamber 101 is provided with a crossbeam chain grate 110. Multiple air inlets are arranged on both sides of the crossbeam chain grate 110 along the lower side of the flue gas flow direction, which are connected to the grate cooling fan 111 to distribute air to the grate for oxygen supply and cooling. Multiple ash hoppers 112 are arranged side by side below the crossbeam chain grate 110 along its flue gas flow direction, and an ash pipe 113 is vertically arranged at the bottom of each ash hopper 112. The bottom ends of the ash pipes 113 are connected to the sodium pyrophosphate recovery section 9. The top end of the horizontal constant temperature furnace in the primary combustion chamber 101 is provided with a flue gas outlet, which is connected to the high-temperature combustion section 2 through a flue. The vertical constant temperature furnace, the horizontal constant temperature furnace and the flue connected to the high-temperature combustion section form a "U"-shaped combustion structure.

[0050] In addition, to improve processing capacity, the waste liquid spray guns 102 are preferably four in number. The vertical constant temperature furnace of the primary combustion chamber 101 is arranged with three layers of natural gas burners 108 in sequence from top to bottom along the height direction, with two or four burners in each layer arranged in a staggered arrangement. The outer wall material of the vertical and horizontal constant temperature furnaces of the primary combustion chamber 101 is Q235B, and the inner side of the shell is covered with a furnace wall, which is divided into three layers: the insulation layer near the shell is made of aluminum silicate fiber felt; the middle insulation layer is made of lightweight insulation castable; and the fire-facing side is a refractory layer made of high-alumina refractory castable.

[0051] The waste liquid spray gun 102 is a dual-fluid atomizing spray gun with steam as the atomizing medium. The spray gun material is 316L and the nozzle material is Hastelloy. In addition, since the viscosity of high-concentration waste liquid is relatively high at low temperatures, and the high-concentration waste liquid remaining in the pipeline during shutdown and startup can cause pipeline blockage due to cooling and lack of flow, a hot water inlet is connected to the inlet pipe of the phosphorus concentrate booster pump 103 via a T-junction for replacement and clearing blockage.

[0052] The high-temperature combustion section 2 includes a vertically arranged high-temperature cyclone separator 201. The top of the side wall of the high-temperature cyclone separator 201 is provided with a flue gas tangential inlet and is connected to the flue gas outlet at the top end of the horizontal constant temperature furnace of the primary combustion chamber 101 through a flue. The top center of the high-temperature cyclone separator 201 is provided with a flue gas outlet and is connected to a secondary combustion chamber 202 through a flue. The bottom cone is connected to an ash collection pipe 113 and is connected to the sodium pyrophosphate recovery section 9 through the ash collection pipe 113. The secondary combustion chamber 202 is located directly above the waste heat boiler 301 of the waste heat recovery section 3. The top center is provided with a flue gas inlet and is connected to the flue gas outlet of the high-temperature cyclone separator 201 through a flue. The bottom center is provided with a flue gas outlet that is vertically downward connected to the waste heat recovery section 3. A natural gas burner 108 is provided on the shoulder of the secondary combustion chamber 202. The natural gas burner 108 is connected to the natural gas pipeline network through a pipeline for introducing natural gas for auxiliary combustion.

[0053] The high-temperature cyclone separator 201 includes a steel shell, a central cylinder, a discharge pipe, and an inner lining. The steel shell is made of Q235B steel, and a furnace wall is installed inside the shell. The furnace wall consists of three layers: an insulation layer near the shell, made of aluminum silicate fiber felt; a heat insulation layer in the middle, made of lightweight heat-insulating castable; and a refractory layer facing the fire, made of high-alumina refractory castable.

[0054] Four natural gas burners 108 are arranged on the shoulder of the secondary combustion chamber 202, evenly distributed in a circumferential direction. The natural gas burners 108 are inserted into the secondary combustion chamber 202 at a certain angle and form an imaginary circle in the center of the furnace according to the direction of the combustion flame. On the one hand, this enhances the full mixing of the combustion flame of the burner with the flue gas entering the primary combustion chamber 101. On the other hand, it increases the flue gas travel and the residence time of the high-temperature flue gas in the furnace, ensuring the complete combustion of organic components.

[0055] The secondary combustion chamber 202 consists of a shell and furnace walls. The furnace walls are divided into three layers: an insulation layer near the shell, made of aluminosilicate fiber felt; a heat insulation layer in the middle, made of lightweight heat-insulating castable; and a refractory layer on the fire-facing side, made of high-alumina refractory castable. The furnace walls are fixed to the steel shell by rivets.

[0056] The waste heat recovery unit 3 includes a vertically arranged waste heat boiler 301, which is a membrane wall structure natural circulation water tube boiler. It exhibits excellent adaptability to flue gas containing highly adhesive dust and does not cause blockage. The waste heat boiler 301 has two bottom-connected cooling chambers, namely Cooling Chamber One and Cooling Chamber Two. Cooling Chamber One has a flue gas inlet at its top, which connects to the flue gas outlet of the secondary combustion chamber 202 via a flue. Cooling Chamber Two has a flue gas outlet near its top on its side wall, which connects to a flue gas quenching unit 4 via a flue. Cooling Chamber One and Cooling Chamber Two... The bottom is equipped with an ash collection pipe 113, which connects to the sodium pyrophosphate recovery unit 9. High-temperature flue gas and molten salt enter from the top of cooling chamber one and flow downwards. In cooling chamber one of the waste heat boiler 301, the temperature drops below the melting point of sodium pyrophosphate salt. At the bottom, the flue gas makes a 180° turn, causing the solid sodium pyrophosphate carried in the flue gas to fall into the bottom of the waste heat boiler 301 using its inertia and enter the ash collection pipe 113. The flue gas then flows upwards in cooling chamber two and exits the waste heat boiler 301 from the upper part of the side wall of cooling chamber two. Multiple sets of screen-type heating surfaces are arranged in cooling chamber two to increase the heat exchange area of ​​the waste heat boiler. During the cooling process, the molten salt rapidly cools into solid, brittle salt. Although a small amount of molten salt may adhere to the membrane wall heating surface of cooling chamber 1 during rapid cooling, forming a solid, brittle film attached to the metal surface of the heat exchange surface, firstly, the film formed by the molten salt on the membrane wall can detach on its own due to gravity, and secondly, the sufficiently large distance between the screen heating surfaces prevents bridging and blockage of the flue gas flow channels; simultaneously, multiple sets of soot blowers 308 are used to periodically blow soot from the heating surfaces to ensure that the accumulated salt on the heating surfaces can be cleaned in a timely manner. The cleaned solid salt falls by gravity into the ash hopper 112 at the bottom of the waste heat boiler 301 and enters the sodium pyrophosphate recovery section 9 through the ash pipe 113.

[0057] The upper header of the waste heat boiler 301 is connected to the waste heat boiler drum 302 via steam and water outlet pipes. The top of the waste heat boiler drum 302 has a steam outlet connected to a steam distributor 303 via a pipe. The steam distributor 303 has two outlet pipes; one outlet pipe connects to the steam network, and the other outlet pipe connects to a thermal deaerator 304. The inlet of the thermal deaerator 304 is connected to a demineralized water pipe via a pipe. The bottom of the thermal deaerator 304 has an outlet connected to a boiler feed pump 305 via a pipe. The outlet of the boiler feed pump 305 is connected to the waste heat boiler via a pipe. The boiler drum 302 is used for water replenishment. The top of the waste heat boiler drum 302 is also equipped with a chemical dosing port and a chemical dosing tank 306 connected to it via a pipe. The chemical dosing tank 306 is connected to the demineralized water pipe via a pipe and is also equipped with a chemical dosing port for adding sodium hydroxide and trisodium phosphate. The bottom of the waste heat boiler drum 302 is equipped with a sewage pipe and connected to a sewage expansion device 307, through which sewage is discharged into a sewage ditch. The side wall of the cooling chamber of the waste heat boiler 301 is equipped with a soot blower 308, and the air inlet of the soot blower 308 is connected to a compressed air buffer tank via a pipe.

[0058] Water from the thermal deaerator is pressurized by the boiler feedwater pump 305 and sent to the waste heat boiler drum 302. It then flows through downcomers into the bottom headers of each heating surface. Inside the heating surface tubes, the feedwater absorbs heat from the flue gas, producing a steam-water mixture. Due to the lower density of the mixture, it rises inside the tubes and enters the upper header. From there, it flows through steam-water outlet pipes into the waste heat boiler drum 302. The separated saturated steam is then piped to the steam network. The waste heat boiler drum 302 incorporates a steam equalization orifice plate, a slotted steam-water separator, a jet feedwater distribution pipe, and an upper blowdown pipe to improve steam quality, ensuring that the saturated steam moisture content is less than 1%. Multiple interfaces are arranged on the waste heat boiler drum 302, allowing for connection to over-temperature and over-pressure alarms and interlocks, remote water level displays, high and low water level alarms, low water level interlocks, etc., to ensure safe and reliable boiler operation.

[0059] The flue gas quenching section 4 includes a vertically arranged quenching tower 401. The top of the quenching tower 401 is provided with a flue gas inlet and is connected to the flue gas outlet of the waste heat boiler 301 through a pipe. The bottom is provided with an ash collection pipe 113 and is connected to the sodium pyrophosphate recovery section 9. The side wall near the bottom is provided with a flue gas outlet and is connected to the flue gas dust removal section 5 through a flue. A quenching atomizing spray gun 402 is provided at the flue gas inlet of the quenching tower 401. The quenching atomizing spray gun 402 is connected to a quenching water spray pump 403 and a compressed air buffer tank through pipes. The inlet of the quenching water spray pump 403 is connected to a quenching water tank 404 through a pipe. The inlet of the quenching water tank 404 is connected to an industrial water pipe through a pipe, which can replenish industrial water in real time.

[0060] The quench tower 401 consists of a shell and an external insulation layer. The shell is made of 304 stainless steel, and the external insulation layer is made of aluminum silicate fiber felt and color steel plate.

[0061] The flue gas dust removal unit 5 includes a bag filter 501. The lower part of the side wall of the bag filter 501 has a flue gas inlet connected to the flue gas outlet of the quench tower 401 via a flue. Two sets of ash collection pipes 113 are located at the bottom and connected to the sodium pyrophosphate recovery unit 9. The top of the side wall opposite the flue gas inlet has a flue gas outlet connected to the flue gas desulfurization unit 6 via a flue. Activated carbon injectors 502 and quicklime injectors 503 are connected to the flue of the bag filter 501 and the quench tower 401 via branch pipes. The inlet end of the activated carbon injector 502 is connected to a feeder, an activated carbon injection fan 504, and an activated carbon storage tank 505 via pipes. The inlet end of the quicklime injector 503 is connected to a feeder, a quicklime injection fan 506, and a quicklime storage tank 507 via pipes. Furthermore, a gas distribution box is located above the side wall of the bag filter 501 and connected to a compressed air buffer tank via a pipe.

[0062] The two sets of dust collection pipes 113 at the bottom of the bag dust collector 501 are connected to the first water-cooled scraper machine. If quicklime or activated carbon powder is sprayed from the flue, the dust is packaged and transported to the horizontal constant temperature furnace in the primary combustion chamber for incineration or outsourced disposal. If quicklime or activated carbon powder is not sprayed from the flue, the dust is sent to the second water-cooled scraper machine for subsequent processing.

[0063] The filter bags of the baghouse dust collector 501 are made of PTFE material, with a filtration velocity of 0.6–0.7 m / min, and the dust concentration in the filtered flue gas is ≤10 mg / Nm³. 3 The baghouse dust collector 501 mainly consists of an upper chamber, a middle chamber, a lower chamber, and a pulse-jet cleaning system. The upper chamber includes a hinged cover and an air outlet; the middle chamber includes a perforated plate, inspection doors, bag cages, and a frame; the lower chamber includes a dust hopper and inspection doors; the pulse-jet cleaning system includes a pulse controller, electromagnetic pulse valves, pulse-jet pipes, and a distribution box. The shell is manufactured using a single-plate bending process to improve its rigidity and sealing. Flue gas first passes through the filter bags of the baghouse dust collector. Dust and particles in the flue gas are captured by inertial impaction. The pulse-jet cleaning system periodically blows the dust adhering to the filter bags, causing it to fall off and ensuring the baghouse dust collector's working efficiency. The main materials of the baghouse dust collector 501 are: Q235B steel plate for the shell, with the outer wall of the shell coated with thermal insulation, using aluminum silicate fiber felt and corrugated board for external insulation.

[0064] The flue gas desulfurization unit 6 includes a vertically arranged desulfurization tower 601. The upper part of the desulfurization tower 601 has multiple layers of desulfurization spray layer 602, and the lower part is a desulfurization circulating liquid storage tank 603. A flue gas outlet is located at the center of the top of the desulfurization tower 601 and connected to the flue gas denitrification unit 7 via a flue. A flue gas inlet is located on the side wall of the desulfurization tower 601 between the desulfurization spray layer 602 and the desulfurization circulating liquid storage tank 603 and connected to the flue gas outlet of the bag filter 501 via a flue. A desulfurization circulating liquid outlet is located at the bottom of the side wall of the desulfurization circulating liquid storage tank 603 and connected to a sedimentation tank 604 via a pipe. The sedimentation tank 604 is sequentially connected to a neutralization tank 605 and a clear water tank 606. The bottom of the sedimentation tank 604 is connected to a sludge... A water pump 607 is used to transport the sewage from the bottom of the sedimentation tank to the sewage treatment plant for further treatment; the neutralization tank 605 is connected to a sodium hydroxide dosing unit 608; the clear water tank 606 is connected to a deacidification circulating spray pump 609, which is connected to the deacidification spray layer 602 through a pipeline; the clear water tank 606 is also connected to a water supply pipe 610, which is connected to the industrial water network, so that the clear water tank 606 can be replenished with water in real time; the deacidification tower 601 is provided with a demisting layer 611 above the deacidification spray layer 602, and clear water spray layers 612 are provided above and below the demisting layer 611 for spraying and cleaning it, and the clear water spray layers 612 are connected to the industrial water pipeline through a pipeline.

[0065] The acidic gases in the flue gas undergo a neutralization reaction with sodium hydroxide in the deacidification circulating liquid within the deacidification tower 601. The reacted deacidification circulating liquid falls into the deacidification circulating liquid storage tank 603 at the bottom of the deacidification tower 601, and overflows into the sedimentation tank 604. After sedimentation, the reaction products and impurities are deposited at the bottom of the tank, while the clear liquid overflows into the neutralization tank 605. Sodium hydroxide solution is introduced into the neutralization tank 605 to control the pH of the circulating acidic liquid in the clear water tank to 7–9. When the dissolved salt in the sedimentation tank 604 reaches a certain concentration, the wastewater pump 607 is activated to send the deacidified wastewater to the wastewater treatment plant.

[0066] The deacidification tower 601 is made of 304 stainless steel. The main advantages of using metal materials in deacidification towers are high strength, long service life, wide operating temperature range, and high tolerance. The deacidification tower 601 adopts a packed tower design, vertically arranged, with flue gas introduced from the bottom and flowing upwards within the tower. The injected alkaline solution flows in the opposite direction to the flue gas, allowing for sufficient contact between the alkaline solution and the flue gas within the packing layer, thus removing acidic gases such as SO2 and HCl from the flue gas. Because the flue gas carries a significant amount of moisture, direct discharge would cause serious problems such as water carryover to the induced draft fan, equipment vibration, equipment corrosion, and the generation of white smoke. Therefore, a baffle demister is designed at the top of the deacidification tower to remove the moisture carried in the flue gas.

[0067] The flue gas denitrification unit 7 includes a flue gas heater 701 and an SCR denitrification reactor 702 connected to its bottom. The flue gas heater 701 has a tangential flue gas inlet at the top of its side wall, which is connected to the flue gas outlet of the desulfurization tower 601 via an induced draft fan 706. A flue gas outlet at the bottom is directly connected to the upper part of the SCR denitrification reactor 702. A natural gas burner 108 is located at the center of the top of the flue gas heater 701, and the inlet of the natural gas burner 108 is connected to a natural gas pipeline network via a pipe. A denitrification atomizing spray gun 703 is located near the bottom of the flue gas heater 701. The inlet of the denitrification atomizing spray gun 703 is connected to a compressed air storage tank and an ammonia spray pump 704 via pipes. The inlet of the ammonia spray pump 704 is connected to an ammonia storage tank 705 via a pipe. The bottom side wall of the SCR denitrification reactor 702 has a flue gas outlet connected to a chimney 8 via a flue, through which the treated flue gas is discharged harmlessly.

[0068] The SCR denitrification reactor is vertically arranged, with flue gas entering from the top and exiting from the bottom side. Ammonia water is used as the denitrification reducing agent; it is injected into the flue gas heater, where the heat from the flue gas evaporates the ammonia water to produce ammonia gas. This ammonia gas mixes with the main flue gas and enters the SCR denitrification reactor together, where the NOx removal reaction takes place under the action of the SCR denitrification catalyst. The catalyst exhibits high activity within the temperature range of 170–240℃, ensuring a NOx removal rate of over 90% in the flue gas.

[0069] The induced draft fan 706 is a centrifugal induced draft fan made of carbon steel. To reduce noise during operation, noise reduction measures are implemented during installation. Since the flue gas temperature passing through the induced draft fan is around 220℃, the fan requires circulating cooling water to cool the fan bearings and lubricating oil, preventing damage from high temperatures.

[0070] The sodium pyrophosphate recovery unit 9 includes a coarse crusher 901 and a twin-shaft crusher 910 located below the end of the beam-type chain grate 110 and connected to the second water-cooled scraper conveyor 903, arranged in sequence for coarse and twin-shaft crushing of sodium pyrophosphate. The sodium pyrophosphate recovery unit 9 also includes a first water-cooled scraper conveyor 902, a second water-cooled scraper conveyor 903, a fine crusher 904, a screw conveyor 905, a first bucket elevator 906, a drum cooler 907, a second bucket elevator 908, and an automatic baler 909, arranged in sequence. The first water-cooled scraper conveyor 902 receives sodium pyrophosphate dust separated by the bag filter 501. Sodium pyrophosphate dust without quicklime or activated carbon powder is scraped to the second water-cooled scraper conveyor 903 after entering the first water-cooled scraper conveyor 902. The second water-cooled scraper conveyor 903 receives sodium pyrophosphate dust from the directional conversion unit 1, the high-temperature incineration unit 2, and the waste heat recovery unit 3. The sodium pyrophosphate generated in the flue gas quenching section 4, along with the sodium pyrophosphate dust (excluding activated carbon and quicklime powder) scraped by the first water-cooled scraper conveyor 902, is fed into the fine crusher 904 for crushing. The crushed sodium pyrophosphate falls directly into the feed inlet of the screw conveyor 905, which then transports it to the feed inlet of the first bucket elevator 906. The first bucket elevator 906 then lifts the sodium pyrophosphate upwards into the drum cooler 907, where it is cooled. The cooled sodium pyrophosphate then enters the feed inlet of the second bucket elevator 908 through the discharge outlet of the drum cooler 907. The second bucket elevator 908 then lifts the cooled sodium pyrophosphate upwards and sends it to the automatic packaging machine 909 for boxing or bagging, before transferring it to a corresponding processing plant for further processing.

[0071] The coarse crusher 901 is a jaw crusher. The working part of the jaw crusher consists of two jaw plates: a fixed jaw plate (fixed jaw) which is vertically (or slightly inclined outward at the top) fixed to the front wall of the machine body, and a movable jaw plate (moving jaw) which is inclined and forms a crushing chamber (working chamber) with the fixed jaw plate, which is larger at the top and smaller at the bottom. The movable jaw plate makes a periodic reciprocating motion toward the fixed jaw plate, sometimes separating and sometimes approaching. When separated, the material enters the crushing chamber, and the finished product is discharged from the bottom; when approaching, the material between the two jaw plates is crushed by compression, bending, and splitting.

[0072] The fine crusher 904 is a hammer crusher, which mainly consists of a casing, rotor, impact blocks, and grate bars. The casing is divided into upper and lower parts, welded from cut steel plates, with the remaining parts connected by bolts. The casing is lined with high-manganese steel plates, which can be replaced when worn. The main shaft of the hammer crusher is equipped with a series of regularly distributed hammers, which, together with the turntable and hammer-piercing shaft, form the rotor. The main shaft is driven by a motor and a V-belt, causing the rotor to rotate. The hammers, subjected to centrifugal force generated by the rotation, extend outwards. Large pieces of material enter the crushing chamber through the inlet and are crushed by the high-speed moving hammers. The qualified material is discharged through the slit grate bars at the bottom, while the unqualified material remains in the crushing chamber and is repeatedly struck by the hammers and impact blocks until it can be discharged.

[0073] In use, the process of incinerating high-phosphorus waste liquid at high temperature followed by targeted conversion and recovery of the conversion byproducts includes the following steps:

[0074] In the first step, the high-concentration waste liquid stored in the waste liquid buffer tank 105 is transported to the boundary area by the waste liquid transfer pump 104, and then sent to the waste liquid spray gun 102 by the phosphorus-containing concentrate booster pump 103. The high-concentration waste liquid is atomized by the medium and sprayed into the furnace from the top of the vertical constant temperature furnace in the primary combustion chamber 101 for incineration. The atomized waste liquid moves from top to bottom, and the auxiliary fuel natural gas is sent through the public works pipeline to multiple natural gas burners 108 arranged in the upper part of the vertical constant temperature furnace in the primary combustion chamber 101. The high-concentration waste liquid is incinerated by the heat provided by the combustion of natural gas, and the incineration temperature is controlled at 650℃~750℃. At high temperature, the high-concentration waste liquid is evaporated by hot water, and organic matter is released and reacts with the combustion air. The phosphorus and sodium elements in the high-concentration waste liquid are resynthesized at high temperature and directionally converted into sodium pyrophosphate. At the same time, a small amount of phosphorus in the high-concentration waste liquid is also converted into sodium pyrophosphate. Sodium chloride crystals precipitate and mix into sodium pyrophosphate. Unburned organic matter, incompletely converted phosphorus and sodium elements, and converted sodium pyrophosphate fall together onto the crossbeam chain grate 110 at the bottom of the primary combustion chamber 101 and enter the horizontal constant temperature furnace of the primary combustion chamber 101. The grate cooling fan 111 at the bottom of the crossbeam chain grate 110 evenly distributes air to adjust the rotation speed of the crossbeam chain grate 110, thereby adjusting the roasting time of the material on the grate. This ensures that the unburned organic matter is completely burned and that the phosphorus and sodium elements are directionally converted into sodium pyrophosphate within the "U"-shaped structure formed by the vertical constant temperature furnace, the horizontal constant temperature furnace, and the flue connected to the high-temperature incineration section. Finally, the converted sodium pyrophosphate is discharged from the ash hopper 112 at the tail of the horizontal constant temperature furnace in the primary combustion chamber 101 and falls sequentially into the coarse crusher and the twin-shaft crusher for coarse crushing and twin-shaft crushing, and then enters the second water-cooled scraper conveyor 903 for conveying.

[0075] In the second step, the waste liquid is transferred from the vertical constant temperature furnace in the primary combustion chamber 101 to the horizontal constant temperature furnace. After complete combustion, the flue gas is drawn out from the tail of the horizontal constant temperature furnace through the flue and sent to the high-temperature cyclone separator. In the cyclone separator, the large particles of sodium pyrophosphate carried in the flue gas are efficiently separated. The separated sodium pyrophosphate falls into the second water-cooled scraper conveyor 903 through the ash pipe 113. The separated flue gas is sent to the secondary combustion chamber 202 through the flue. In the secondary combustion chamber 202, natural gas is burned to raise the flue gas temperature to above 1100°C. The high-temperature flue gas above 1100°C stays in the secondary combustion chamber 202 for more than 2 seconds to completely burn off the organic components in the flue gas.

[0076] In the third step, the high-temperature flue gas discharged from the secondary combustion chamber 202 at 1100℃ enters the waste heat boiler 301. The waste heat boiler 301 absorbs the heat of the high-temperature flue gas to produce saturated steam as a byproduct. The flue gas, cooled to 550℃±50℃ by the waste heat boiler 301, enters the quench tower. At the same time, due to the soot blower 308 of the waste heat boiler 301 and the action of gravity, the salt adhering to the membrane wall and some of the sodium pyrophosphate carried in the flue gas will be separated. The separated sodium pyrophosphate falls into the second water-cooled scraper conveyor 903 through the ash discharge pipe 113.

[0077] In the fourth step, the quench tower 401 uses atomized water to rapidly reduce the flue gas temperature from about 550°C to 180°C to 200°C within 1 second, thereby preventing the resynthesis of toxic and harmful dioxin-like substances in the flue gas during the cooling process. At the same time, under the action of inertia, a portion of the sodium pyrophosphate carried in the flue gas will be separated off, and the separated sodium pyrophosphate will fall into the second water-cooled scraper conveyor 903 through the ash discharge pipe.

[0078] Fifth, the flue gas, after rapid cooling to 180℃~200℃, enters the bag filter 501 for dust removal. Activated carbon and quicklime injectors are arranged on the connecting flue between the rapid cooling tower 401 and the bag filter 501, injecting activated carbon and quicklime powder into the flue gas to adsorb and remove potentially generated dioxin-like harmful substances and heavy metals. After adsorption and removal, the flue gas enters the bag filter 501 again for gas-solid separation, separating the fine sodium pyrophosphate, activated carbon, quicklime powder, etc., carried in the flue gas.

[0079] Although the fly ash collected by the bag filter is mainly composed of sodium pyrophosphate, it is classified as hazardous waste due to the presence of activated carbon and quicklime powder. It must be collected separately and then sent to a horizontal constant-temperature furnace in the primary combustion chamber for incineration or outsourced disposal. If activated carbon and quicklime powder are not sprayed, the fly ash can be recycled as a byproduct from the first water-cooled scraper conveyor 902 to the second water-cooled scraper conveyor 903.

[0080] Step 6: The dust-removed flue gas is sent to the deacidification tower 601 through the flue, where wet alkaline deacidification is performed with external circulation. An alkaline solution of appropriate concentration is prepared in a clear water tank and pumped to each deacidification spray layer 602 in the deacidification tower 601 and sprayed into the flue gas. The sodium hydroxide in the alkaline solution neutralizes the acidic gases in the flue gas, removing SO2, HCl and other acidic gases carried in the flue gas. The temperature of the flue gas discharged from the deacidification tower is reduced to 60-80℃.

[0081] Step 7: The flue gas after dust removal and acid removal is sent to the flue gas heater 701 by the induced draft fan 706. The temperature of the flue gas is heated from 60-80℃ to above 220℃ by the heat provided by burning natural gas. Then it enters the SCR denitrification reactor 702. The denitrification reducing agent is ammonia water. The ammonia water is heated to release ammonia gas, which is mixed with the flue gas and then enters the SCR denitrification reactor 702. In the SCR denitrification reactor 702, the nitrogen oxides in the flue gas undergo a reduction reaction with ammonia gas under the action of a catalyst, reducing the nitrogen oxides to nitrogen gas and water, thereby achieving the purpose of denitrification.

[0082] Step 8: The denitrified flue gas is sent to chimney 8 for direct discharge through the flue. At this time, after rapid cooling, dust removal, acid removal and denitrification treatment, the pollutants in the flue gas can be discharged in compliance with standards. In addition, due to the measures of cooling the flue gas and then heating it up, there will be no "white fog" phenomenon, and there is no problem of affecting the landscape of the factory area.

[0083] In the ninth step, the second water-cooled scraper conveyor 903 transports the sodium pyrophosphate falling from the primary combustion chamber 101, high-temperature cyclone separator 201, waste heat boiler 301, and quench tower 401, as well as the sodium pyrophosphate without activated carbon and quicklime powder falling from the first water-cooled scraper conveyor 902, to the fine crusher 904. The sodium pyrophosphate powder after fine crushing is sent to the drum cooler 907 for cooling via the screw conveyor 905 and the first bucket elevator 906. The cooled sodium pyrophosphate is then sent to the automatic packaging machine 909 by the second bucket elevator 908 for packaging and storage. At the same time, a small bag dust collector and an exhaust fan are installed to create a negative pressure state in the workshop of the above conveying equipment to prevent the spilled sodium pyrophosphate powder from polluting the environment.

[0084] This invention employs a primary combustion chamber with a vertical constant-temperature furnace, top-mounted with waste liquid spray guns and multiple natural gas burners arranged in layers on the sides. This ensures uniform combustion temperature within the primary combustion chamber, preventing localized overheating leading to molten salt agglomeration or underheating resulting in unburned material. The directional conversion section, consisting of a vertical and horizontal constant-temperature furnace connected to a flue forming a "U" shape with the high-temperature incineration section, extends the reaction time for the directional conversion of sodium pyrophosphate. This allows the sodium and phosphorus in the waste liquid to fully react and be directionally converted into sodium pyrophosphate, which then falls into the sodium pyrophosphate recovery section. The secondary combustion chamber is located on top of the waste heat boiler. The flue gas containing carbon monoxide and unburned material is fully combusted and incinerated within the secondary combustion chamber, with a reaction time >2 seconds. The inorganic salts carried in the flue gas enter the waste heat boiler in a molten state and, under the cooling effect of the boiler's heating surfaces, transform from liquid to solid before entering the sodium pyrophosphate recovery section. By recovering heat from flue gas through a waste heat boiler and producing saturated steam as a byproduct, energy efficiency is improved. The combined use of a membrane wall boiler and a soot blowing device prevents blockages in the waste heat recovery equipment, ensuring smooth operation. The sodium pyrophosphate recovered from incineration is collected and reused through a sodium pyrophosphate recovery unit, reducing waste generation. The use of bag filters, activated carbon injectors, and quicklime injectors effectively reduces dust and heavy metal content in the flue gas, controls the formation of harmful substances such as dioxins, and reduces secondary pollution to the environment. Comprehensive treatment of flue gas is achieved through rapid cooling, dust removal, acid removal, and denitrification, ensuring that the emitted flue gas meets environmental protection requirements. The flue gas is cooled and then reheated, preventing white fog from appearing when discharged from the chimney and reducing the impact on the plant's landscape.

[0085] Although embodiments of the present invention have been shown and described, it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, it will be understood by those skilled in the art that all other embodiments obtained by making various changes, modifications, substitutions and variations to these embodiments without departing from the principles and spirit of the present invention and without creative effort are within the scope of protection of the present invention.

Claims

1. A device for the targeted conversion of glyphosate-containing high-salt phosphorus organic waste liquid, characterized in that: The system includes a directional conversion section (1) and is connected in sequence to a high-temperature combustion section (2), a waste heat recovery section (3), a flue gas quenching section (4), a flue gas dust removal section (5), a flue gas desulfurization section (6), a flue gas denitrification section (7), and a chimney (8) via a flue. The directional conversion section (1), high-temperature combustion section (2), waste heat recovery section (3), flue gas quenching section (4), and flue gas dust removal section (5) are all connected to a sodium pyrophosphate recovery section (9). The directional conversion section (1) includes a primary combustion chamber (101) and a waste liquid atomization section, a combustion air section, and a natural gas combustion section connected to it. The high-temperature combustion section (2) includes a high-temperature cyclone separator (201) and a secondary combustion chamber (202). The waste heat recovery section (3) includes a waste heat boiler (301) and a waste heat recovery unit (202). The boiler drum (302) is a hot boiler; the flue gas quenching section (4) includes a quenching tower (401); the flue gas dust removal section (5) includes a bag filter (501); the flue gas deacidification section (6) includes a deacidification tower (601); the flue gas denitrification section (7) includes a flue gas heater (701) and an SCR denitrification reactor (702) connected to its bottom; the sodium pyrophosphate recovery section (9) includes a coarse crusher (901), a first water-cooled scraper conveyor (902), a second water-cooled scraper conveyor (903), a fine crusher (904), a screw conveyor (905), a first bucket elevator (906), a drum cooler (907), a second bucket elevator (908), an automatic baler (909), and a twin-shaft crusher (910).

2. The glyphosate (amine)phosphine high-salt phosphorus-containing organic waste liquid directional conversion device according to claim 1, characterized in that: The primary combustion chamber (101) includes a vertical constant temperature furnace and a horizontal constant temperature furnace at its bottom; the waste liquid atomization section includes one or more waste liquid spray guns (102) arranged at the center of the top of the vertical constant temperature furnace and connected to a phosphorus-containing concentrate booster pump (103), a waste liquid transfer pump (104), and a waste liquid buffer tank (105); the combustion air section includes multiple combustion air nozzles (106) arranged around the waste liquid spray guns (102) and connected to a combustion air fan (107); the natural gas combustion section includes three layers of natural gas burners (108) arranged from top to bottom in the vertical constant temperature furnace, with two or four burners arranged in a staggered pattern in each layer; the bottom of the horizontal constant temperature furnace is provided with a beam-type chain grate (110) and cooled by the grate. The cooling fan (111) supplies oxygen and cools the grate by distributing air at multiple points below it. Multiple ash hoppers (112) are arranged side by side along its axial direction below it, and ash pipes (113) are arranged at the bottom of them. The bottom ends of the ash pipes (113) are connected to the sodium pyrophosphate recovery section (9). The side wall of the vertical constant temperature furnace is equipped with a temperature sensor (109) that is linked to the natural gas burner (108) on it. The horizontal constant temperature furnace is equipped with a temperature sensor (109) that is linked to the natural gas burner on it. The top end of the horizontal constant temperature furnace is equipped with a flue gas outlet and is connected to the high-temperature combustion section (2) through a flue. The vertical constant temperature furnace, the horizontal constant temperature furnace and the flue connected to the high-temperature combustion section form a "U"-shaped combustion structure.

3. The glyphosate (amine)phosphine high-salt phosphorus-containing organic waste liquid directional conversion device according to claim 2, characterized in that: The high-temperature cyclone separator (201) is vertically arranged, with a flue gas outlet at the center of its top and connected to the secondary combustion chamber (202), and the bottom cone connected to the sodium pyrophosphate recovery unit (9) through the ash drop pipe (113). The secondary combustion chamber (202) is located directly above the waste heat recovery unit (3), with a flue gas outlet at the center of its bottom that is vertically connected to the waste heat recovery unit (3), and four natural gas burners (108) are evenly arranged around its shoulder and connected to the natural gas pipeline network.

4. The glyphosate (amine)phosphine high-salt phosphorus-containing organic waste liquid directional conversion device according to claim 3, characterized in that: The waste heat boiler (301) is a vertical membrane wall structure natural circulation water tube boiler, including a cooling chamber 1 and a cooling chamber 2 connected at the bottom. A flue gas inlet is located at the top of cooling chamber 1, and a flue gas outlet is located near the top of the side wall of cooling chamber 2, connected to the flue gas quenching section (4) via a flue. The bottoms of both cooling chambers are connected to the sodium pyrophosphate recovery section (9) via ash collection pipes (113). The upper header of the waste heat boiler is connected to the waste heat boiler steam drum (302) via steam and water outlet pipes, and a steam outlet is located at its top connected to a steam distribution cylinder (303). The steam cylinder (303) is connected to the steam network and the thermal deaerator (304) respectively through two exhaust pipes; the bottom of the thermal deaerator (304) is connected to the boiler feed water pump (305) and connected to the waste heat boiler drum (302); the top of the waste heat boiler drum (302) is provided with a chemical dosing port and is connected in sequence with a chemical dosing tank (306) and a demineralized water pipeline, and the bottom is provided with a sewage pipe and connected to a sewage tank through a sewage expansion device (307); the soot blower (308) is located on one side wall of the cooling chamber and is connected to a compressed air buffer tank.

5. The glyphosate (amine)phosphine high-salt phosphorus-containing organic waste liquid directional conversion device according to claim 4, characterized in that: The quench tower (401) has a flue gas inlet at the top and is connected to the sodium pyrophosphate recovery unit (9) at the bottom via an ash collection pipe (113). A flue gas outlet is located near the bottom on the side wall and is connected to the flue gas dust removal unit (5). A quench atomizing spray gun (402) is arranged at the flue gas inlet of the quench tower (401). The quench atomizing spray gun (401) is connected to the quench water spray pump (403) and the compressed air buffer tank via pipes. The quench water spray pump (403) is connected to the quench water tank (404) and the industrial water pipe in sequence via pipes.

6. The glyphosate (amine)phosphine high-salt phosphorus-containing organic waste liquid directional conversion device according to claim 5, characterized in that: The bag filter (501) has a flue gas inlet at the lower part of its side wall, and is connected to the sodium pyrophosphate recovery unit (9) at the bottom through two sets of ash collection pipes (113). A flue gas outlet is provided at the top of the side wall opposite to the flue gas inlet and is connected to the flue gas desulfurization unit (6). The flue between the bag filter (501) and the quench tower (401) is connected to an activated carbon injector (502) and a quicklime injector (503) through branch pipes. The inlet end of the activated carbon injector (502) is connected to a feeder in sequence through a pipe. The system includes an activated carbon injection blower (504) and an activated carbon storage tank (505). The inlet end of the quicklime injector (503) is sequentially connected to a feeder, a quicklime injection blower (506), and a quicklime storage tank (507) via pipes. A gas distribution box is installed above the side wall of the bag filter (501) and connected to a compressed air buffer tank. The filter bags of the bag filter (501) are made of PTFE material, with a filter velocity of 0.6–0.7 m / min, and the dust concentration in the filtered flue gas is ≤10 mg / Nm³. 3 .

7. The glyphosate (amine)phosphine high-salt phosphorus-containing organic waste liquid directional conversion device according to claim 6, characterized in that: The deacidification tower (601) is provided with, from top to bottom, a demister layer (611) and a clean water spray layer (612) connected to industrial water pipes on its upper and lower sides, a multi-layer deacidification spray layer (602), and a deacidification circulating liquid storage tank (603). A flue gas outlet is provided at the top center and connected to the flue gas denitrification section (7) through a flue. A flue gas inlet is provided on the side wall between the deacidification spray layer (602) and the deacidification circulating liquid storage tank (603). A deacidification circulating liquid outlet is provided at the bottom of the side wall of the deacidification circulating liquid storage tank (603) and connected to a sedimentation tank (604) through a pipe. The sedimentation tank (604) is connected in sequence to... The system includes a neutralization tank (605) and a clear water tank (606). The sedimentation tank (604) is connected to a sewage pump (607). The neutralization tank (605) is connected to a sodium hydroxide dosing unit (608). The pH value of the circulating acid in the clear water tank is controlled to be 7-9 by introducing sodium hydroxide solution into the neutralization tank (605). The clear water tank (606) is connected to a deacidification circulating spray pump (609), which is connected to the deacidification spray layer (602) through a pipeline. The clear water tank (606) is also connected to a water supply pipe (610), which is connected to the industrial water network.

8. The glyphosate (amine)phosphine high-salt phosphorus-containing organic waste liquid directional conversion device according to claim 7, characterized in that: The flue gas heater (701) has a tangential flue gas inlet at the top of its side wall, which is connected to the flue gas outlet of the deacidification tower (601) via an induced draft fan (706). The bottom of the flue gas heater (701) has a flue gas outlet directly connected to the upper part of the SCR denitrification reactor (702). A natural gas burner (108) is located at the center of the top. A denitrification atomizing spray gun (703) is located near the bottom inside the flue gas heater (701). The denitrification atomizing spray gun (703) is connected to a compressed air storage tank and an ammonia spray pump (704) via pipes. The ammonia spray pump (704) is connected to an ammonia storage tank (705) via a pipe. The bottom side wall of the SCR denitrification reactor (702) has a flue gas outlet, which is connected to a chimney (8) via a flue. The induced draft fan (706) uses circulating cooling water to cool the fan bearings and lubricating oil.

9. The glyphosate (amine)phosphine high-salt phosphorus-containing organic waste liquid directional conversion device according to claim 8, characterized in that: The coarse crusher (901) is located below the end of the crossbeam chain grate (110), and a twin-shaft crusher (910) is located below it and connected to the second water-cooled scraper conveyor (903). The first water-cooled scraper conveyor (902) receives sodium pyrophosphate dust separated by the bag filter (501). The second water-cooled scraper conveyor (903) receives sodium pyrophosphate generated by the directional conversion section (1), high-temperature combustion section (2), waste heat recovery section (3), and flue gas quenching section (4), as well as sodium pyrophosphate dust without activated carbon and quicklime powder scraped by the first water-cooled scraper conveyor (902). A fine crusher (904) is located below its discharge end. At the outlet of the fine crusher (904), a screw conveyor (905), a first bucket elevator (906), a drum cooler (907), a second bucket elevator (908), an ash storage bin, and an automatic baler (909) are arranged in sequence.

10. A glyphosate high-salt phosphorus-containing organic waste liquid directional conversion device as described in claim 9, wherein the high-salt phosphorus-containing waste liquid is directionally converted into sodium pyrophosphate byproduct through a constant-temperature incineration reaction and recycled, and the high-temperature flue gas is discharged after waste heat recovery and environmental protection treatment, characterized in that: Includes the following steps: In the first step, the high-concentration waste liquid in the waste liquid buffer tank (105) is atomized by the waste liquid transfer pump (104), the phosphorus-containing concentrate booster pump (103), and the waste liquid spray gun (102) and then sprayed into the top of the vertical constant temperature furnace. The combustion is assisted by the combustion of natural gas through multiple natural gas burners (108) and the combustion temperature is controlled at 650℃~750℃, which is directionally converted into sodium pyrophosphate. The unburned organic matter, the unconverted phosphorus and sodium elements, and the converted sodium pyrophosphate fall together on the crossbeam chain grate (110) at the bottom of the primary combustion chamber (101) and enter the horizontal constant temperature furnace to achieve complete combustion and directional conversion into sodium pyrophosphate. Then, it is transported in the furnace by the crossbeam chain grate (110) of the horizontal constant temperature furnace to the tail ash hopper (112) and discharged. It falls into the coarse crusher (901) and the twin-shaft crusher (910) in sequence. After coarse crushing, it enters the second water-cooled scraper (903). In the second step, the flue gas is drawn out from the tail of the horizontal constant temperature furnace through the flue and sent to the high temperature cyclone separator for separation. The separated sodium pyrophosphate falls into the second water-cooled scraper (903) through the ash pipe (113). The separated flue gas is sent to the secondary combustion chamber (202) through the flue. The flue gas is heated to above 1100°C by the combustion of auxiliary fuel in the natural gas burner. The high temperature flue gas above 1100°C is burned in the secondary combustion chamber (202) and stays for more than 2 seconds. In the third step, the flue gas from the secondary combustion chamber (202) enters the waste heat boiler (301) to absorb heat and produce saturated steam as a byproduct. After the flue gas temperature drops to 550℃±50℃, it enters the quench tower. Some sodium pyrophosphate will fall into the second water-cooled scraper conveyor (903) through the ash pipe (113) at the bottom of the waste heat boiler (301). In the fourth step, the quench tower (401) rapidly reduces the flue gas at 550℃±50℃ to 180℃~200℃ in less than 1s by atomizing water spray. At the same time, some sodium pyrophosphate carried in the flue gas is separated by gravity and falls to the bottom of the quench tower (401), and is transported to the second water-cooled scraper conveyor (903) through the ash collection pipe at the bottom of the quench tower (401). In the fifth step, the flue gas at 180℃~200℃ flowing out of the quench tower (401) enters the bag filter (501). At the same time, activated carbon and quicklime powder are injected into the flue gas through the flue gas duct of the bag filter (501) by activated carbon injector and quicklime injector. The bag filter (501) separates and collects the fine sodium pyrophosphate, activated carbon, quicklime powder and other materials carried in the flue gas and sends them to the horizontal constant temperature furnace or outsources them for disposal. Although the fly ash collected by the bag filter is mainly composed of sodium pyrophosphate, it is classified as hazardous waste due to the presence of activated carbon and quicklime powder. It needs to be collected separately and sent to a horizontal constant temperature furnace in the primary combustion chamber for incineration or outsourced for disposal. If activated carbon and quicklime powder are not sprayed, the fly ash can be recycled as a byproduct sodium pyrophosphate by the first water-cooled scraper conveyor (902) to the second water-cooled scraper conveyor (903). Step 6: The flue gas after dust removal is sent to the desulfurization tower (601) through the flue, where SO2 and HCl gases carried in the flue gas are removed by circulating alkaline solution spraying; the temperature of the flue gas discharged from the desulfurization tower is reduced to 60-80℃. Step 7: The flue gas after dust removal and acid removal is sent to the flue gas heater (701) by the induced draft fan (706). The flue gas temperature is heated to above 220°C by burning natural gas and then enters the SCR denitrification reactor (702). Ammonia water is sprayed as a reducing agent and denitrification is carried out under the catalytic action of the catalyst built into the SCR denitrification reactor (702). Step 8: The denitrified flue gas is sent through the flue to the chimney (8) for direct discharge; In the ninth step, the second water-cooled scraper conveyor (903) transports the sodium pyrophosphate falling from the primary combustion chamber (101), high-temperature cyclone separator (201), waste heat boiler (301), and quench tower (401), as well as the sodium pyrophosphate without activated carbon and quicklime powder falling from the first water-cooled scraper conveyor (902), to the fine crusher (904). The sodium pyrophosphate powder after fine crushing is sent to the drum cooler (907) for cooling via the screw conveyor (905) and the first bucket elevator (906). The cooled sodium pyrophosphate is then transported by the second bucket elevator (908) to the automatic packaging machine (909) for packaging and storage. At the same time, a small bag dust collector and an exhaust fan are installed to create a negative pressure state in the workshop of the above-mentioned conveying equipment to prevent the overflow of sodium pyrophosphate powder from polluting the environment.

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