Multi-waste-flow incineration treatment system of PO device

Abstract

The invention discloses a multi-waste-flow incineration treatment system of a PO device, and aims to overcome the defect that in the related technology, nitrogen oxide can be generated in the waste flow combustion process, and discharged air pollution is caused. The device comprises a combustion fan used for introducing air; the burner is used for generating flames through ignition, and the burner is communicated with the waste material flow so as to supply fuel; high-temperature flue gas generated by fuel combustion and heated air enter the incineration boiler for heat exchange; the denitrification system is used for introducing a reducing agent into the flue gas to eliminate nitrogen-containing wastes; the tail gas treatment system is used for discharging the tail gas to the atmosphere after dust removal; the air speed, the air amount and the fuel supply speed provided by the combustion fan adapt to the temperature level of the incineration boiler, so that the generation of nitrogen oxides is reduced, and the heat loss generated by synthesizing the nitrogen oxides is reduced.

Description

Technical Field

[0001] The present invention relates to the field of waste treatment, and more specifically, to an incineration treatment system for multiple waste streams of a PO plant. Background Art

[0002] During the production process of a PO plant, by-products fuel oil and by-products fuel gas of the PO plant and tail gas discharged from the intermediate tank farm are generated. These waste fluid streams have a relatively high calorific value. Direct discharge will not only cause pollution but also result in considerable energy waste.

[0003] In the related art, the waste streams are incinerated and their calorific value is utilized. The high temperature in the furnace generated by the combustion of the waste streams can, on the one hand, ensure that harmful substances in the materials are fully pyrolyzed at high temperature, and at the same time, the high temperature generated by incineration can be heat-exchanged with a heat medium through heat transfer to transfer heat in the form of steam. Incineration uses the waste streams as a reducing agent and oxygen in the air as an oxidizing agent. In the related art, air is directly input for oxygen supply. However, nitrogen in the air will combine with oxygen and be converted into nitrogen oxides in a high-temperature environment, causing pollution after being discharged to the outside.

[0004] This application aims to treat possible nitrogen oxides through an incineration treatment system to reduce nitrogen oxide emissions. Summary of the Invention

[0005] The present invention overcomes the deficiency in the related art that nitrogen oxides are generated during the combustion process of waste streams, causing air pollution in emissions, and provides an incineration treatment system for multiple waste streams of a PO plant, which can reduce the generation of nitrogen oxides and reduce heat loss caused by the synthesis of nitrogen oxides.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions: An incineration treatment system for multiple waste streams of a PO plant, where the multiple waste streams include by-products fuel gas of the PO plant, by-products fuel oil of the PO plant, and tail gas discharged from the intermediate tank farm; Comprising: A combustion air blower for introducing air; A burner, which generates a flame through ignition, and the burner is connected to the waste streams to supply fuel; An incineration boiler, where the high-temperature flue gas and heated air generated by fuel combustion enter the incineration boiler for heat exchange; A denitrification system, where flue gas is passed through a reducing agent to eliminate nitrogen-containing wastes; An exhaust gas treatment system for discharging the exhaust gas to the atmosphere after dust removal; The air velocity, air volume, and fuel supply speed provided by the combustion air blower are adapted to the temperature level of the incineration boiler.

[0007] The process flow of this application is as follows: The combustion-supporting blower supplies air, which enters the combustion chamber and mixes with the provided waste stream for combustion and heat release; the high-temperature flue gas enters the incineration boiler and exchanges heat with the circulating water through heat radiation and conduction. The circulating water then transfers the heat to the external incoming water to generate steam that meets the requirements for external use. The flue gas generated by incineration is treated by the denitrification system to remove the internal nitrogen oxides, and then passes through the tail gas treatment system to remove the micro-solids therein and is discharged through the chimney.

[0008] In addition to the chemical method used in the denitrification system, this application also controls the air volume and the supply speed of the fuel, and adjusts the temperature of the incineration boiler. Specifically, the air temperature is limited to 1100 degrees Celsius to avoid the generation of thermal nitrogen oxides caused by excessive temperature. This application controls the temperature of the incineration boiler by controlling the air inlet speed and the air supply volume. To reduce the generation of nitrogen oxides, a higher gas flow rate is set to reduce the residence time of the gas flow in the incineration boiler, and the heat is taken away by the flue gas passing through at high speed, so as to maintain the heat within the specified limit. Within the specified limit, the probability of nitrogen and oxygen combining to produce nitrogen oxides is relatively low, and the generated amount is small.

[0009] Preferably, the fuel also includes natural gas, and the natural gas burns to increase the temperature level of the incineration boiler. When the temperature of the incineration boiler reaches the preset temperature, the supply of the natural gas is stopped and replaced with the by-product fuel gas of the PO device, the by-product fuel oil of the PO device, and the tail gas discharged from the intermediate tank area. It is started with natural gas. During the start-up stage of the entire PO device, natural gas is used as the raw material. After the temperature of the incineration boiler reaches 1100 degrees Celsius, the fuel is replaced with the above-mentioned waste stream. At this temperature, the waste stream can be fully burned.

[0010] Preferably, the burner includes a mixer, and the mixer includes a nozzle for passing air and an intake branch pipe connecting the fuel. The intake branch pipe communicates with the nozzle. The air passes through the nozzle at high speed, and the internal pressure of the nozzle is lower than that of the intake branch pipe. Under the action of the waste stream in the intake branch pipe and the negative pressure, the waste stream enters the nozzle and is sprayed out after mixing with the air.

[0011] Preferably, the nozzle includes a front pipe, a throat pipe, and a rear pipe. The diameter of the throat pipe is less than or equal to the thinnest part of the front pipe and the rear pipe. Along the direction from the throat pipe to the front pipe and the rear pipe, the inner diameters of the front pipe and the rear pipe gradually increase. The rear pipe is provided with an intake circuit communicating with the intake branch pipe, and the intake circuit communicates with the dead corner of the combustion chamber. The inner diameter of the nozzle changes from large to small and then to large, which can increase the gas flow velocity. The geometric structure of the nozzle that first converges and then expands improves the gas flow velocity. The intake circuit improves the gas flow in the dead corner area, avoids the accumulation of combustibles in the dead corner area, and improves safety.

[0012] Preferably, an adjusting structure for adjusting the diameter of the throat tube is provided on the throat tube. By adjusting the diameter of the throat tube, the velocity of the ejected air flow is adjusted, so that the air flow velocity is relatively low during the ignition preheating stage (when the furnace temperature rises to 1100 °C), the residence time of the air flow in the furnace is relatively long, the temperature rises rapidly, and the consumption of natural gas is reduced. After reaching 1100 °C, the diameter of the throat tube is adjusted again to achieve a higher flow rate, thereby maintaining this temperature and reducing the generation of nitrogen oxides.

[0013] Preferably, the adjusting structure is arranged on the inner wall of the throat tube. The adjusting structure includes a streamlined wind baffle and an airbag arranged behind the wind baffle. The length of the airbag is the same as that of the throat tube. The airbag can extend transversely out of both sides of the wind baffle. Each adjusting structure is arranged at equal intervals. When inflated, adjacent airbags are provided with adapted hook surfaces and fuzzy surfaces at the transversely extending ends, and the hook surfaces and fuzzy surfaces are detachably fitted. A gas collecting ring communicating with each airbag is arranged outside the throat tube, and the inner diameter of the throat tube is adjusted by inflating or inhaling the gas collecting ring. Among them, Preferably, the denitrification system includes 10% concentration ammonia water directly introduced into the incineration boiler and an SCR reactor arranged outside the incineration boiler. The ammonia water is sprayed in through an atomizing injector. The flue gas generated by combustion gradually cools down along the boiler, and the ammonia water is sprayed into the corresponding temperature range of the flue gas access. The SCR reactor includes an atomizing spray gun and a dilution fan. The atomizing spray gun accesses ammonia gas and the air flow introduced by the dilution fan. In an environment of 1100 °C, nitrogen oxides may still be generated between oxygen and nitrogen, but their content in the flue gas is relatively low. In order to eliminate these nitrogen oxides to meet the regulatory requirements, 10% concentration ammonia water directly sprayed in is set in the incineration boiler as SNCR denitrification, which is mixed with the flue gas and used as a reducing agent to reduce the nitrogen oxides therein to nitrogen gas. In order to improve the reaction efficiency, the set temperature range is 850 °C to 1050 °C. Further, the low-temperature flue gas (280 °C to 420 °C) discharged from the incineration boiler is sent to the SCR reactor, and the ammonia oxides in it are further treated by the ammonia gas fully mixed with air in the SCR reactor. The aforementioned air flow mixed with ammonia gas is powered by a dilution fan.

[0014] Preferably, the dilution fan is connected to the tail gas treatment system, and a part of the flue gas after dust removal in the tail gas treatment system is sent to the SCR reactor through the dilution fan. This setting ensures the full atomization effect of the denitrification agent and the uniformity of spraying into the flue, and at the same time reduces the introduction of fresh air and the burden on the tail gas treatment system.

[0015] Preferably, the incineration boiler includes a furnace, a steam drum, an evaporator, a superheater and a heat exchanger. The side wall of the furnace is provided with a membrane water wall. The steam drum, the membrane water wall and the evaporator form a closed loop. The steam generated by the steam drum through the steam-water separator is heated by the superheater. The incineration boiler transfers heat through the membrane water wall. The heat generated by combustion is transferred to the furnace through heat radiation and conduction, heating the circulating water passing through the membrane water wall, and the circulating water cools down the furnace. Subsequently, the circulating water in the gas-liquid mixed state enters the steam drum, and saturated steam is generated after separation by the steam-water separator. Subsequently, it exchanges heat with the flue gas again through the superheater and is heated to the superheated state, and the high-quality steam is sent out through the steam pipe network to transfer heat.

[0016] Preferably, a low-temperature economizer is further provided between the denitrification system and the tail gas treatment system. The flue gas exchanges heat with the external water supply through the low-temperature economizer and enters the steam drum. The external water supply is preheated by exchanging heat with the low-temperature economizer, making full use of the heat.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) By means of the adjustable mixer, the air flow rate is adjusted under the same gas supply volume, so as to meet the different requirements of the ignition stage and the maintenance stage; (2) A denitrification system is provided to carry out two-stage reaction treatment on nitrogen oxides, fully eliminating nitrogen oxides and meeting the regulatory requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the system of the present invention; Figure 2 is a schematic diagram of the mixer of the present invention; Figure 3 is a schematic diagram of the nozzle of the present invention; Figure 4 is Figure 3 a cross-sectional view of the airbag expansion at A-A in Figure 5 is Figure 3 a cross-sectional view of the airbag retraction at A-A in In the figure: Combustion air blower 1, burner 2, incineration boiler 3, steam drum 4, SCR reactor 5, low-temperature economizer 6, bag filter 7, chimney 8, buffer tank 9, flash tank 10, mixer 11, nozzle 12, intake branch pipe 13, intake circuit 14, front pipe 15, throat pipe 16, rear pipe 17, wind deflector 18, airbag 19, gas collecting ring 20. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present disclosure will be further described below in conjunction with the drawings and embodiments.

[0020] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only relational terms determined for the convenience of describing the structural relationship of each component or element of the present disclosure and do not specifically refer to any component or element in the present disclosure and should not be construed as a limitation to the present disclosure.

[0023] In the present disclosure, terms such as "fixed connection", "connected", "connected to" should be understood in a broad sense, which may mean a fixed connection, an integral connection or a detachable connection; it may be directly connected or indirectly connected through an intermediate medium. For those skilled in the relevant scientific research or technology in this field, the specific meanings of the above terms in the present disclosure can be determined according to specific circumstances and should not be construed as a limitation to the present disclosure.

[0024] Embodiment: A multi-waste stream incineration treatment system for a PO device, where the multi-waste streams include PO device by-product fuel gas, PO device by-product fuel oil, and tail gas discharged from the intermediate tank area; See Figure 1 As shown, it includes: A combustion air blower 1 for introducing air; A burner 2, which generates a flame through ignition, and the burner 2 is connected to the waste stream to supply fuel; An incineration boiler 3, where the high-temperature flue gas and heated air generated by fuel combustion enter the incineration boiler 3 for heat exchange; A denitrification system, where the flue gas is passed through a reducing agent to eliminate nitrogen-containing wastes; A tail gas treatment system, which discharges the tail gas to the atmosphere after dust removal; The air velocity, air volume provided by the combustion air blower 1 and the fuel supply speed are adapted to the temperature level of the incineration boiler 3.

[0025] The fuel also includes natural gas, which is used in the startup stage. The natural gas burns to increase the temperature level of the incineration boiler 3. When the temperature of the incineration boiler 3 reaches the preset temperature, the supply of the natural gas is stopped and replaced with the by-product fuel gas of the PO plant, the by-product fuel oil of the PO plant, and the tail gas discharged from the intermediate tank area. Starting with natural gas, during the startup stage of the entire PO plant, using natural gas as the raw material, after the temperature of the incineration boiler 3 reaches 1100 degrees Celsius, the fuel is replaced with the above-mentioned waste stream. At this temperature, the waste stream can be fully burned.

[0026] The fuel of the burner 2 is supplied through corresponding different pipelines. Among them, natural gas can be directly connected to the intake branch pipe 13, and is also connected to the buffer tank 9 through a branch pipe. The by-product fuel gas of the PO plant is connected to the buffer tank 9, and the buffer tank 9 is communicated with the intake branch pipe 13; the tail gas discharged from the intermediate tank area is directly connected to the intake branch pipe 13 through a pipeline, and the by-product fuel oil of the PO plant is mixed with atomizing steam and then connected to the intake branch pipe 13.

[0027] See Figure 2 As shown, the burner 2 includes a mixer 11. The mixer 11 includes a nozzle 12 for passing air and an intake branch pipe 13 connecting the fuel. The intake branch pipe 13 is communicated with the nozzle 12. Air passes through the nozzle 12 at high speed, and the internal pressure of the nozzle 12 is lower than that of the intake branch pipe 13. Under the action of the waste stream in the intake branch pipe 13 and the negative pressure, the waste stream enters the nozzle 12 and is mixed with air and then ejected.

[0028] See Figure 3 As shown, the nozzle 12 includes a front pipe 15, a throat pipe 16, and a rear pipe 17. The diameter of the throat pipe 16 is less than or equal to the thinnest part of the front pipe 15 and the rear pipe 17. Along the direction from the throat pipe 16 to the front pipe 15 and the rear pipe 17, the inner diameters of the front pipe 15 and the rear pipe 17 gradually increase. The rear pipe 17 is provided with an intake circuit 14 communicating with the intake branch pipe 13, and the intake circuit 14 is communicated with the dead corner of the combustion chamber. The inner diameter of the nozzle 12 changes from large to small and then to large, which can increase the air flow velocity. The geometric structure of the nozzle 12 that first converges and then expands increases the air flow velocity.

[0029] The throat pipe 16 is provided with an adjusting structure for adjusting the diameter of the throat pipe 16. By adjusting the diameter of the throat pipe 16, the air flow velocity of the ejected air is adjusted, so that the air flow velocity is lower during the ignition and preheating stage (when the furnace temperature rises to 1100 degrees Celsius), the residence time of the air flow in the furnace is longer, the temperature rises rapidly, and the consumption of natural gas is reduced. After reaching 1100 degrees Celsius, the diameter of the throat pipe 16 is adjusted again to achieve a higher flow velocity, thereby maintaining this temperature and reducing the generation of nitrogen oxides.

[0030] The adjustment structure is arranged on the inner wall of the throat 16, and includes a streamlined windshield 18 and an airbag 19 arranged behind the windshield 18. The length of the airbag 19 is the same as that of the throat 16. The airbag 19 can extend laterally from both sides of the windshield 18. Each adjustment structure is arranged at equal intervals. When inflated, the adjacent airbags 19 are provided with adaptive hook surfaces and fur surfaces at both ends of the laterally extended airbags 19. The hook surfaces and fur surfaces are detachable and fit. The throat 16 is provided with an air collecting ring 20 connecting the airbags 19 on the outside. The inner diameter of the throat 16 is adjusted by inflating or sucking the air collecting ring 20. The airbag 19 is made of high temperature resistant material.

[0031] Ginseng Figure 4 , Figure 5 As shown, the nozzle 12 is provided with an adjustment structure in order to adjust the diameter of the throat 16, thereby changing the velocity of the ejected gas, so as to eject a relatively low-speed airflow (set a relatively thick throat 16) in the heating stage to achieve rapid heating; after reaching an appropriate temperature, the diameter of the throat 16 is adjusted (set a relatively thin throat 16), and then a relatively high airflow velocity is generated to reduce heat accumulation, and in conjunction with the heat exchange structure set in the furnace, the temperature is prevented from further rising to the point where a large amount of nitrogen oxides are produced. For this purpose, the present application is provided with a windshield 18 and an airbag 19, and the windshield 18 shields the airbag 19, and improves aerodynamics by setting a shape similar to an arc. When the airbag 19 is retracted to the rear of the windshield 18, the diameter of the throat 16 becomes larger and the airflow velocity becomes slower. When the airbag 19 is extended and adjacent airbags 19 are connected by hooks and fur, the diameter of the throat 16 is reduced, thereby increasing the air velocity.

[0032] In order to ensure that the expansion and retraction of the airbag 19 can be smoother, it is fixedly connected to the inner wall of the throat 16 at the midpoint on the windward side, and a plurality of folds are provided at its end. When it is inflated, the two sides of the airbag 19 are expanded like wings. When it is deflated, the airbag 19 is also folded and gathered to the rear of the windshield 18 with the end folds.

[0033] The principle of increasing the flow rate of the nozzle 12 is the same as that of the Laval nozzle 12, and its principle will not be repeated.

[0034] Burner 2 is ignited by a low-voltage capacitor ignition device, powered by alternating current, which is converted into direct current and then charged into the capacitor. The discharge current is transmitted to the semiconductor nozzle of the ignition gun through the discharge tube, choke coil, shielded cable, etc., forming a high-energy arc spark. When the ignition device stops working, the residual charge on the capacitor is discharged through the discharge resistor.

[0035] The burner 2 also has a fire viewing hole for observing the flame shape and a built-in flame detector. The flame detector adopts an infrared and ultraviolet integrated photosensitive element, and a dust-proof lens is installed at the front end of the probe to eliminate the "false detection" phenomenon.

[0036] The incineration boiler 3 includes a furnace, a steam drum 4, an evaporator, a superheater and a heat exchanger. The side wall of the furnace is provided with a membrane water wall. The steam drum 4 forms a closed loop with the membrane water wall and the evaporator. The steam generated by the steam drum 4 through the steam-water separator is heated by the superheater. The incineration boiler 3 transfers heat through the membrane water wall. The heat generated by combustion is transferred to the furnace by means of thermal radiation and conduction, heating the circulating water passing through the membrane water wall, and the circulating water cools down the furnace. Subsequently, the circulating water in the gas-liquid mixed state enters the steam drum 4, and saturated steam is generated after separation by the steam-water separator. Subsequently, it exchanges heat with the flue gas again through the superheater and is heated to the superheated state, and the high-quality steam is sent out through the steam pipe network to transfer heat.

[0037] The denitrification system includes 10% concentration ammonia water directly introduced into the incineration boiler 3 and an SCR reactor 5 arranged outside the incineration boiler 3. The ammonia water is sprayed in through an atomizing injector. The flue gas generated by combustion gradually cools down along the boiler, and the ammonia water is sprayed into the corresponding flue gas access temperature range. The SCR reactor 5 includes an atomizing spray gun and a dilution blower. The atomizing spray gun accesses ammonia gas and the air flow introduced through the dilution blower. In an environment of 1100 degrees Celsius, there is still a possibility of generating nitrogen oxides between oxygen and nitrogen, but its content in the flue gas is relatively low. In order to eliminate these nitrogen oxides to meet the regulatory requirements, 10% concentration ammonia water directly sprayed in is set as SNCR denitrification in the incineration boiler 3, which is mixed with the flue gas and used as a reducing agent to reduce the nitrogen oxides therein to nitrogen gas. In order to improve the reaction efficiency, the set temperature range is 850°C to 1050°C. Furthermore, the low-temperature flue gas (280°C to 420°C) discharged from the incineration boiler 3 is sent into the SCR reactor 5, and the ammonia oxides therein are further treated by the ammonia gas fully mixed with air in the SCR reactor 5. The aforementioned air flow mixed with ammonia gas uses the dilution blower as the power. The dilution blower is connected to the tail gas treatment system, and a part of the flue gas generated after dust removal in the tail gas treatment system is sent to the SCR reactor 5 through the dilution blower. The SCR reactor 5 also has a catalyst and adopts medium-temperature denitrification technology. The reaction temperature is controlled at 280 to 420°C. After SCR denitrification, the nitrogen oxides in the flue gas are removed, so that the content of nitrogen oxides in the tail gas is lower than 30mg / Nm3. This setting reduces the introduction of fresh air and reduces the burden on the tail gas treatment system.

[0038] A low-temperature economizer 6 is also provided between the denitrification system and the tail gas treatment system. The flue gas exchanges heat with the external water supply through the low-temperature economizer 6 and enters the steam drum 4. The external water supply is preheated by exchanging heat with the low-temperature economizer 6, making full use of the heat.

[0039] The tail gas treatment system includes a bag filter 7 and a chimney 8. After the flue gas is dust-removed by the bag filter 7, it is discharged to the outside through the chimney 8. Part of the flue gas treated by the bag filter 7 is mixed with ammonia by a dilution fan to form a reducing agent for the denitration system.

[0040] The incineration boiler 3 also includes a blowdown system that sends sewage to a flash tank 10. The heat exchange surface tubes in the boiler flue are surface-cleaned by a steam soot blower. A chemical dosing device is provided on the boiler steam drum for descaling the inside of the heat exchange surface tubes. In this process, heat is exchanged between the circulating water in the circulation pipeline and the sewage in the blowdown system to generate low-pressure steam, reducing heat energy loss.

[0041] In some embodiments, the aforementioned combustion-supporting fan 1 and dilution fan both adopt a dual-machine backup mode.

[0042] The process flow of this application is as follows: The combustion-supporting fan 1 supplies air, and the air enters the combustion chamber and mixes with the supplied waste stream to burn and release heat. The high-temperature flue gas enters the incineration boiler 3 and exchanges heat with the circulating water through heat radiation and conduction. The circulating water then transfers the heat to the external incoming water to generate the required steam for external use. The flue gas generated by incineration is treated by the denitration system to remove the internal nitrogen oxides, and then the micro-solids are removed through the tail gas treatment system and discharged through the chimney 8.

[0043] In addition to the chemical method used in the denitration system, this application also controls the temperature of the incineration boiler 3 by controlling the supply speed of air and fuel. Specifically, the air temperature is limited to 1100 degrees Celsius to avoid the generation of thermal nitrogen oxides caused by too high a temperature. This application controls the temperature of the incineration boiler 3 by controlling the inlet speed and supply volume of air, thereby controlling the furnace temperature. To reduce the generation of nitrogen oxides, a higher gas flow rate is set to reduce the residence time of the gas flow in the incineration boiler 3, and the heat is carried away by the high-speed flue gas, so as to maintain the heat within the said limit. Within the said limit, the probability of nitrogen and oxygen combining to produce nitrogen oxides is relatively low, and the amount generated is small.

[0044] The above-described embodiments are only preferred solutions of the present invention and do not impose any form of limitation on the present invention. There are other variations and modifications without exceeding the technical solutions described in the claims.

Claims

1. A PO device multi-waste stream incineration treatment system, characterized in that, The multi-waste streams include the by-product fuel gas of the PO unit, the by-product fuel oil of the PO unit, and the exhaust gas discharged from the intermediate tank area; including: a combustion-supporting fan for introducing air; a burner that generates a flame by ignition, and the burner is connected to the waste stream to supply fuel; an incineration boiler, where the high-temperature flue gas and the heated air generated by fuel combustion enter the incineration boiler for heat exchange; a denitrification system, where the flue gas is passed through a reducing agent to eliminate nitrogen-containing waste; a tail gas treatment system that discharges the tail gas to the atmosphere after dust removal; The air velocity, air volume provided by the combustion-supporting fan, and fuel supply velocity are adapted to the temperature level of the incineration boiler.

2. The multi-waste stream incineration treatment system for a PO device according to claim 1, wherein The fuel also includes natural gas, and the natural gas burns to increase the temperature level of the incineration boiler. When the temperature of the incineration boiler reaches the preset temperature, the supply of natural gas is stopped and replaced with the by-product fuel gas of the PO unit, the by-product fuel oil of the PO unit, and the exhaust gas discharged from the intermediate tank area.

3. The PO device multi-waste stream incineration treatment system according to claim 1, characterized in that, The burner includes a mixer, and the mixer includes a nozzle for passing air and an intake branch pipe for connecting fuel, and the intake branch pipe is connected to the nozzle.

4. A PO device multi-waste stream incineration treatment system according to claim 3, characterized in that, The nozzle includes a front pipe, a throat pipe, and a rear pipe. The diameter of the throat pipe is less than or equal to the thinnest part of the front pipe and the rear pipe. Along the direction from the throat pipe to the front pipe and the rear pipe, the inner diameters of the front pipe and the rear pipe gradually increase. The rear pipe is provided with an intake circuit connected to the intake branch pipe, and the intake circuit is connected to the dead corner of the combustion chamber.

5. A multi-waste stream incineration treatment system for a PO device according to claim 4, characterized in that, The throat pipe is provided with an adjusting structure for adjusting the diameter of the throat pipe.

6. The multi-waste stream incineration treatment system for a PO device according to claim 5, wherein, The adjusting structure is arranged on the inner wall of the throat pipe. The adjusting structure includes a streamlined wind deflector and an airbag arranged behind the wind deflector. The length of the airbag is the same as the length of the throat pipe. The airbag can extend transversely out of both sides of the wind deflector. Each adjusting structure is arranged at equal intervals. When inflated, the adjacent airbags are provided with adapted hook surfaces and fuzzy surfaces at the transversely extending ends, and the hook surfaces and the fuzzy surfaces are detachably fitted. An air collecting ring connected to each airbag is arranged outside the throat pipe, and the inner diameter of the throat pipe is adjusted by inflating or sucking air from the air collecting ring.

7. A PO device multi-waste stream incineration treatment system according to claim 1, characterized in that, The denitrification system includes 10% concentration ammonia water directly introduced into the incineration boiler and an SCR reactor arranged outside the incineration boiler. The ammonia water is sprayed by an atomizing injector. The flue gas generated by combustion gradually cools down along the boiler, and the ammonia water is sprayed into the corresponding temperature range of the flue gas access. The SCR reactor includes an atomizing spray gun and a dilution fan, and the atomizing spray gun accesses ammonia gas and the air flow introduced by the dilution fan.

8. A PO device multi-waste stream incineration treatment system according to claim 7, characterized in that, The dilution fan is connected to the tail gas treatment system, and a part of the flue gas generated by the tail gas treatment system after dust removal is sent to the SCR reactor through the dilution fan.

9. A PO device multi-waste stream incineration treatment system according to claim 1, characterized in that, The incineration boiler includes a furnace, a steam drum, an evaporator, a superheater, and a heat exchanger. The side wall of the furnace is provided with a membrane water wall. The steam drum forms a closed loop with the membrane water wall and the evaporator, and the steam generated by the steam drum through the steam-water separator is heated by the superheater.

10. A PO device multi-waste stream incineration treatment system according to claim 9, characterized in that, A low-temperature economizer is also arranged between the deammoniation system and the tail gas treatment system, and the flue gas exchanges heat with the external water supply through the low-temperature economizer and enters the steam drum.

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