High-low boiling waste liquid incineration treatment process and device for ethylene-method vinyl acetate device

Abstract

The invention discloses a high-low boiling waste liquid incineration treatment process and device for an ethylene-method vinyl acetate device, aiming at high-low boiling waste liquid generated in the production process of ethylene-method vinyl acetate, the high-low boiling waste liquid is atomized by compressed air to obtain an atomized substance, and the atomized substance is incinerated to generate high-heat flue gas; and the high-heat flue gas is sequentially subjected to cooling, waste heat recovery, dust removal and denitration treatment to obtain clean flue gas meeting emission requirements, and the clean flue gas is emptied, so that on-site treatment of incineration treatment of the high-boiling and low-boiling waste liquid of the ethylene-method vinyl acetate device is realized. The problem that high-low waste liquid generated by an ethylene-method vinyl acetate device is difficult to treat is solved in a breakthrough mode, and the treatment cost and risks brought in the treatment and transportation process are greatly reduced through the on-site treatment mode. The method is easy to operate, reliable in operation and good in economical efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of hazardous waste treatment, and in particular relates to an incineration treatment process and a treatment device for high- and low-boiling waste liquids from an ethylene-based vinyl acetate device. Background Art

[0002] There are two main methods for producing vinyl acetate: the calcium carbide acetylene method and the ethylene method. Among them, the calcium carbide acetylene method is highly polluting and has high calcium carbide costs; the ethylene method has a large vinyl acetate production capacity, low pollution, and fewer side reactions. Therefore, the production of vinyl acetate in the industry is gradually shifting from the calcium carbide acetylene method to the ethylene method. However, the high- and low-boiling waste liquids generated in the production of vinyl acetate by the ethylene method are mainly composed of tar, acetic acid, ethyl acetate, vinyl acetate, potassium carbonate, potassium acetate, and inhibitors, which are hazardous wastes. At present, various manufacturers have no processing capacity for high- and low-boiling waste liquids, and they need to be transported to specialized hazardous waste treatment companies for treatment. The treatment cost is expensive, and there are high safety risks during transportation. Summary of the invention

[0003] The present invention aims to avoid the deficiencies of the above-mentioned prior art and to provide a process and device for incinerating high and low boiling waste liquids from an ethylene vinyl acetate device, so as to achieve on-site treatment of high and low boiling waste liquids generated in the production process of ethylene vinyl acetate, avoid long-distance transportation, eliminate the potential safety hazards caused by long-distance transportation, and reduce treatment costs.

[0004] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme:

[0005] The characteristics of the incineration treatment process of high- and low-boiling waste liquids of an ethylene-based vinyl acetate device of the present invention are as follows: for high- and low-boiling waste liquids generated in the production process of vinyl acetate produced by the ethylene method, the high- and low-boiling waste liquids are atomized by compressed air to obtain atomized products, the atomized products are incinerated to generate high-temperature flue gas, and the high-temperature flue gas is sequentially cooled, waste heat recovered, dusted and denitrated to obtain clean flue gas that meets emission requirements and is discharged, thereby realizing on-site treatment of the incineration treatment of high- and low-boiling waste liquids of an ethylene-based vinyl acetate device.

[0006] The incineration treatment process of high and low boiling waste liquids of the ethylene-based vinyl acetate device of the present invention is carried out according to the following process:

[0007] Step 1, pressurizing the high-boiling and low-boiling waste liquids from the waste liquid pipeline of the ethylene-based vinyl acetate device to 1.0-1.2 MPa through a multistage pump, quantitatively transporting them to the atomizer in the waste liquid burner, and atomizing them with compressed air of not less than 0.8 MPa to obtain an atomized product;

[0008] Step 2, sending the atomized material into an incinerator for incineration, wherein the incinerator is a vertical furnace, wherein the atomized material is ignited by natural gas in the incinerator, so that the atomized material is fully oxidized, pyrolyzed and burned at a combustion temperature of not less than 1100° C. and a residence time of not less than 2 seconds;

[0009] Step 3, introducing air delivered by a cooling fan into the middle and bottom of the incinerator respectively, and controlling the bottom temperature of the incinerator to be no higher than 650° C. and the middle temperature of the incinerator to be 950-1050° C. by cooling;

[0010] Step 4: SNCR spray guns are arranged at multiple points in the middle of the incinerator to perform SNCR denitration at a furnace temperature of 950-1050° C. to reduce nitrogen oxides in the hot flue gas into nitrogen;

[0011] Step 5, sending the flue gas discharged from the bottom of the incinerator to the waste heat boiler, using the heat of the flue gas to generate steam, so that the temperature of the boiler flue gas discharged from the waste heat boiler is not higher than 350°C;

[0012] Step 6: Send the boiler flue gas to the economizer, and utilize the waste heat from the waste heat boiler flue gas through feed water heat exchange, so that the flue gas temperature after the feed water heat exchange is 220-240° C.;

[0013] Step 7, the flue gas discharged from the economizer enters the bag filter, in which the particulate matter generated by the combustion is removed by the ash remover;

[0014] Step 8, the flue gas discharged from the bag filter at a temperature of 180 to 220° C. enters the SCR denitration device, and the nitrogen oxides escaping under low temperature conditions are converted into nitrogen in the SCR denitration device;

[0015] Step 9: The flue gas exhausted from the SCR denitration device is heat exchanged with the combustion-supporting air provided by the combustion-supporting fan in the flue gas heat exchanger and then discharged into the atmosphere through the chimney through the induced draft fan at a temperature not higher than 140°C.

[0016] The characteristics of the incineration treatment process of high- and low-boiling waste liquids from the ethylene-based vinyl acetate device of the present invention are also that: in the step 6, the water used to achieve water feed heat exchange is desalted water transported through a desalted water pipeline, the desalted water is deoxygenated by a deaerator at a temperature of 104°C, and then sent to the economizer by a water feed pump, where it is heated by the waste heat of flue gas and then sent to the waste heat boiler to generate steam.

[0017] The incineration treatment process for high and low boiling waste liquids of the ethylene-based vinyl acetate device of the present invention is also characterized in that the incinerator is set to operate at negative pressure, and the internal pressure of the incinerator is maintained at -200 to -100 KPa by using the terminal induced draft fan.

[0018] The incineration treatment process for high and low boiling waste liquids of an ethylene-based vinyl acetate device of the present invention is also characterized in that the SCR denitration device is configured as an SCR reactor, and two catalyst layers are arranged inside the SCR reactor, using a honeycomb catalyst.

[0019] The incineration treatment process for high and low boiling waste liquids of an ethylene-based vinyl acetate device of the present invention is also characterized in that an adjusting damper is arranged on the air outlet duct of the cooling fan to control the opening of the adjusting damper and thus adjust the air supply volume.

[0020] The incineration treatment process of high and low boiling waste liquids of the ethylene-based vinyl acetate device of the present invention is also characterized in that the material sprayed from the SNCR spray gun is a urea aqueous solution with a concentration of 5% to 10%, and the injection amount is adjusted according to the nitrogen oxide value monitored online on the chimney.

[0021] The characteristics of the incineration treatment process of high and low boiling waste liquids of the ethylene-based vinyl acetate device of the present invention are also that: the bag dust collector adopts a pulse filter bag type high-efficiency dust collector, and the bag dust collector is automatically blown with compressed air according to the pressure difference before and after the bag dust collector or by setting a timing.

[0022] The high- and low-boiling waste liquid incineration treatment device of the ethylene-based vinyl acetate device of the present invention comprises:

[0023] A waste liquid burner is used to atomize high- and low-boiling waste liquids from a waste liquid pipeline in an ethylene-based vinyl acetate unit to obtain an atomized product;

[0024] An incinerator, wherein the atomized material is sent into the incinerator for incineration, so that the atomized material is fully oxidized, pyrolyzed and burned in the incinerator;

[0025] A cooling fan, used to supply cold air to the middle and bottom of the incinerator respectively;

[0026] SNCR spray guns are arranged at multiple points in the middle of the incinerator to reduce nitrogen oxides in the hot flue gas into nitrogen through SNCR denitration;

[0027] Waste heat boiler, the flue gas discharged from the bottom of the incinerator is sent to the waste heat boiler, and the heat of the flue gas is used to generate usable steam;

[0028] Economizer: the flue gas discharged from the waste heat boiler is sent to the economizer to realize waste heat utilization through feed water heat exchange;

[0029] A bag filter, in which the flue gas discharged from the economizer enters the bag filter, in which particulate matter produced by combustion is removed by an ash remover;

[0030] An SCR denitration device, in which the flue gas discharged from the bag filter enters the SCR denitration device, and the nitrogen oxides escaping under low temperature conditions are converted into nitrogen in the SCR denitration device;

[0031] Flue gas heat exchanger: the flue gas discharged from the SCR denitrification device exchanges heat with the combustion-supporting air provided by the combustion-supporting fan in the flue gas heat exchanger, and then is drawn out through the induced draft fan and discharged into the atmosphere through the chimney.

[0032] The high- and low-boiling waste liquid incineration treatment device of the ethylene-based vinyl acetate device of the present invention is also characterized in that: a deaerator and a water supply pump are provided, and the desalted water used to realize the water supply heat exchange is deoxygenated by the deaerator and then sent to the economizer by the water supply pump, and then heated by the flue gas waste heat in the economizer and sent to the waste heat boiler for generating steam; the SCR denitrification device is configured as an SCR reactor; and the bag filter adopts a pulse filter bag type high-efficiency dust collector.

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

[0034] 1. The present invention realizes on-site treatment of high- and low-boiling waste liquids generated in the production process of ethylene-based vinyl acetate, avoids long-distance transportation, eliminates the potential safety hazards caused by long-distance transportation, and reduces treatment costs;

[0035] 2. The present invention ensures full combustion while making full use of waste heat, and the generated steam is effectively used in the vinyl acetate device, which is greatly beneficial to saving energy and reducing energy consumption;

[0036] 3. The present invention is equipped with a denitrification and dust removal system, so that the various indicators of the flue gas discharged meet the requirements of environmental protection emission standards;

[0037] 4. The device of the present invention has a high degree of automation, significant practicality and huge economic benefits, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the process of the present invention.

[0039] Numbers in the figure: 1 waste liquid burner; 2 incinerator; 3 waste heat boiler; 4 economizer; 5 bag filter; 6 SCR denitrification device; 7 flue gas heat exchanger; 8 induced draft fan; 9 chimney; 10 ash remover; 11 SNCR spray gun; 12 cooling fan; 13 deaerator; 14 feed water pump; 15 combustion-supporting fan; 16 waste liquid pipeline; 17 desalted water pipeline; 18 steam pipeline. DETAILED DESCRIPTION

[0040] The incineration treatment process for high- and low-boiling waste liquids of an ethylene-based vinyl acetate device in this embodiment is as follows: for high- and low-boiling waste liquids generated in the production process of vinyl acetate produced by the ethylene process, the high- and low-boiling waste liquids are atomized by compressed air to obtain an atomized product, the atomized product is incinerated to generate high-temperature flue gas, and the high-temperature flue gas is sequentially cooled, waste heat recovered, dust removed, and denitrated to obtain clean flue gas that meets emission requirements and is discharged, thereby realizing on-site treatment of the incineration treatment of high- and low-boiling waste liquids of an ethylene-based vinyl acetate device.

[0041] See also Figure 1 In this embodiment, the incineration treatment process of high and low boiling waste liquids of ethylene-based vinyl acetate unit is carried out according to the following process:

[0042] Step 1: The high- and low-boiling waste liquids from the waste liquid pipeline 16 of the ethylene-based vinyl acetate device are pressurized to 1.0-1.2 MPa by a multi-stage pump, quantitatively transported to the atomizer in the waste liquid burner 1, and atomized using compressed air of not less than 0.8 MPa to obtain an atomized product.

[0043] Step 2: sending the atomized material into the incinerator 2 for incineration. The incinerator 2 is a vertical furnace. In the incinerator 2, the atomized material is ignited by natural gas, so that the atomized material is fully oxidized, pyrolyzed and burned at a combustion temperature of not less than 1100° C. and a residence time of not less than 2 seconds.

[0044] Step 3, the air delivered by the cooling fan 12 is introduced into the middle and bottom of the incinerator 2 respectively, and the bottom temperature of the incinerator 2 is controlled to be no higher than 650°C by cooling, and the middle temperature of the incinerator 2 is 950-1050°C; in this embodiment, the incinerator 2 is set to negative pressure operation, and the terminal induced draft fan 8 is used to maintain the internal pressure of the incinerator 2 at -200--100Kpa; an adjustable damper can be set on the air outlet duct of the cooling fan 12 to control the opening of the adjustable damper, thereby adjusting the air supply volume. The high and low boiling waste liquid produced by the ethylene-based vinyl acetate device contains potassium carbonate with a melting point of 891°C. Controlling the bottom temperature of the incinerator to no higher than 650°C can effectively prevent potassium salt from being attached to the furnace wall of the waste heat boiler 3 in a molten state and affecting the boiler heat exchange.

[0045] Step 4, SNCR spray guns 11 are arranged at multiple points in the middle of the incinerator 2, and SNCR denitrification is performed at a furnace temperature of 950-1050° C. to reduce the nitrogen oxides in the high-temperature flue gas to nitrogen. In this embodiment, the material sprayed from the SNCR spray gun 11 is a urea aqueous solution with a concentration of 5% to 10%, and the injection amount is adjusted according to the nitrogen oxide value monitored online on the chimney 9.

[0046] Step 5, the flue gas discharged from the bottom of the incinerator 2 is sent to the waste heat boiler 3, steam is generated by using the heat of the flue gas and introduced into the device for reuse through the steam pipeline 18, so that the temperature of the boiler flue gas discharged from the waste heat boiler 3 is not higher than 350°C.

[0047] Step 6, send the boiler flue gas into the economizer 4, and use the waste heat of the boiler flue gas 3 from the waste heat boiler 3 through feed water heat exchange, so that the flue gas temperature after the feed water heat exchange is 220-240°C, thereby avoiding the purchase of boiler deoxidation agents, reducing costs, and reducing the labor intensity of personnel dispensing agents; the water used for feed water heat exchange in this embodiment is desalted water transported by the desalted water pipeline 17, and is deoxygenated by the deaerator 13 with a temperature of 104°C, and then sent to the economizer 4 by the feed water pump 14, and is heated in the economizer 4 using the waste heat of the flue gas and then sent to the waste heat boiler 3 for generating steam.

[0048] Step 7, the flue gas exhausted from the economizer 4 enters the bag filter 5, in which the particulate matter produced by combustion is removed by the ash remover 10; the bag filter 5 can be automatically blown with compressed air according to the pressure difference before and after the bag filter 5 or by setting a timing.

[0049] Step 8, the flue gas with a temperature of 180-220°C discharged from the bag filter 5 enters the SCR denitrification device 6, and the nitrogen oxides escaping under low temperature conditions are converted into nitrogen in the SCR denitrification device 6; in this embodiment, the SCR denitrification device 6 is configured as an SCR reactor, and two catalyst layers are arranged inside the SCR reactor, using a honeycomb catalyst; the catalyst is mainly composed of V2O5, WO, and TiO2. Thanks to the fact that the nitrogen oxides escaping can be removed at low temperatures, the nitrogen oxide emissions meet the requirements.

[0050] Step 9: The flue gas exhausted from the SCR denitration device 6 is heat exchanged with the combustion-supporting air provided by the combustion-supporting fan 15 in the flue gas heat exchanger 7 and then drawn out through the induced draft fan 8 at a temperature not higher than 140° C. and discharged into the atmosphere through the chimney 9.

[0051] See also Figure 1 According to the incineration treatment process of high and low boiling waste liquid of ethylene-based vinyl acetate unit in this embodiment, the treatment device includes:

[0052] A waste liquid burner 1 is used to atomize high and low boiling waste liquids from a waste liquid pipeline 16 of an ethylene vinyl acetate plant to obtain an atomized product;

[0053] The incinerator 2 is used to send the atomized material into the incinerator 2 for incineration, so that the atomized material is fully oxidized, pyrolyzed and burned in the incinerator 2;

[0054] A cooling fan 12 is used to supply cold air to the middle and bottom of the incinerator 2 respectively;

[0055] SNCR spray guns 11 are arranged at multiple points in the middle of the incinerator 2 to reduce nitrogen oxides in the hot flue gas into nitrogen through SNCR denitration;

[0056] The waste heat boiler 3 sends the flue gas discharged from the bottom of the incinerator 2 into the waste heat boiler 3, and uses the heat of the flue gas to generate usable steam;

[0057] Economizer 4, the flue gas discharged from the waste heat boiler 3 is sent to the economizer 4, and the waste heat is utilized through feed water heat exchange;

[0058] Bag filter 5, the flue gas discharged from the economizer 4 enters the bag filter 5, in which the particulate matter produced by combustion is removed by the ash remover 10;

[0059] SCR denitration device 6, the flue gas discharged from the bag filter 5 enters the SCR denitration device 6, and the nitrogen oxides escaping under low temperature conditions are converted into nitrogen in the SCR denitration device 6;

[0060] The flue gas heat exchanger 7 , the flue gas discharged from the SCR denitration device 6 and the combustion-supporting air provided by the combustion-supporting air fan 15 are heat-exchanged in the flue gas heat exchanger 7 , and then drawn out through the induced draft fan 8 , and discharged into the atmosphere through the chimney 9 .

[0061] In this embodiment, a deaerator 13 and a feed water pump 14 are also provided to realize feed water heat exchange. The desalted water from the outside is deoxygenated by the deaerator 13 and then sent to the economizer 4 by the feed water pump 14. After being heated by the waste heat of the flue gas in the economizer 4, it is sent to the waste heat boiler 3 for generating steam; the SCR denitrification device 6 is configured as an SCR reactor; the bag dust collector 5 adopts a pulse filter bag type high-efficiency dust collector. Figure 1 In the process shown, in actual operation, due to gravity, particles will be deposited to varying degrees at the bottom of the equipment, so a dust collector 10 is provided at the bottom of the equipment through which the flue gas passes.

[0062] The treatment process and treatment device of the present invention are mainly used for high and low boiling liquids produced by ethylene-based vinyl acetate devices; the main components of the high and low boiling liquids are tar, acetic acid, ethyl acetate, vinyl acetate, potassium acetate and potassium carbonate, etc.; the high and low boiling liquids do not contain halogen elements, so the process and device of this embodiment do not need to consider the problem of removing dioxins, and do not need to be configured as a quenching device for removing dioxins.

[0063] The present invention adds cooling air in the middle and lower parts of the incinerator. In the middle part of the incinerator, one function is to cool the flue gas at 1100°C to 950-1050°C to meet the SNCR denitrification requirement. Another main function is to reduce the flue gas temperature out of the incinerator to 650°C to ensure that the salt in the waste liquid enters the boiler in a non-molten state to prevent boiler blockage.

[0064] The present invention adds an economizer after the waste heat boiler, aiming to fully utilize the heat of the flue gas, while increasing the temperature of the boiler water to generate a larger amount of steam.

[0065] The present invention adds a deaerator, which can reduce boiler corrosion compared with the use of ordinary boilers, and reduce the deoxidizing agent required by the boiler, which not only saves costs but also reduces manpower.

[0066] The SCR denitrification device of the present invention has two honeycomb catalyst layers arranged inside, which can remove the escaped nitrogen oxides at low temperature, so that the nitrogen oxide emissions meet the requirements after being treated by the process of the present invention.

[0067] The present invention adds a flue gas heat exchanger 7 after the SCR denitrification device 6, so that the flue gas exhausted from the SCR denitrification device 6 and the combustion-supporting air provided by the combustion-supporting fan 15 exchange heat in the flue gas heat exchanger 7, and once again fully utilizes the flue gas heat to heat the combustion-supporting air of the incinerator, thereby reducing the gas consumption of the incinerator and improving the energy-saving effect.

Claims

1. A process for incinerating high and low boiling waste liquids from an ethylene-based vinyl acetate plant, characterized in that: With regard to the high and low boiling waste liquids generated in the production process of vinyl acetate by the ethylene process, the high and low boiling waste liquids are atomized by compressed air to obtain atomized products, which are then incinerated to generate high-temperature flue gas. The high-temperature flue gas is sequentially cooled, subjected to waste heat recovery, dust removal and denitrification treatment to obtain clean flue gas that meets emission requirements and is discharged, thereby realizing on-site treatment of the incineration of high and low boiling waste liquids in the ethylene process vinyl acetate device.

2. The process for incinerating high and low boiling waste liquids from an ethylene-based vinyl acetate plant according to claim 1, characterized in that Follow the following process: Step 1, pressurizing the high-boiling and low-boiling waste liquids from the waste liquid pipeline (16) of the ethylene-based vinyl acetate device to 1.0-1.2 MPa through a multi-stage pump, quantitatively transporting them to the atomizer in the waste liquid burner (1), and atomizing them with compressed air of not less than 0.8 MPa to obtain an atomized product; Step 2, sending the atomized material into an incinerator (2) for incineration, wherein the incinerator (2) is a vertical furnace, wherein the atomized material is ignited by natural gas in the incinerator (2), so that the atomized material is fully oxidized, pyrolyzed and burned at a combustion temperature of not less than 1100° C. and a residence time of not less than 2 seconds; Step 3, air delivered by a cooling fan (12) is introduced into the middle and bottom of the incinerator (2), and the bottom temperature of the incinerator (2) is controlled by cooling to be no higher than 650° C., and the middle temperature of the incinerator (2) is 950-1050° C.; Step 4, arranging SNCR spray guns (11) at multiple points in the middle of the incinerator (2), performing SNCR denitration at a furnace temperature of 950-1050° C., and reducing nitrogen oxides in the high-temperature flue gas into nitrogen; Step 5, sending the flue gas discharged from the bottom of the incinerator (2) into the waste heat boiler (3), using the heat of the flue gas to generate steam, so that the temperature of the boiler flue gas discharged from the waste heat boiler (3) is not higher than 350° C.; Step 6, sending the boiler flue gas to the economizer (4), and utilizing the waste heat of the boiler flue gas (3) from the waste heat boiler (3) through feed water heat exchange, so that the flue gas temperature after the feed water heat exchange is 220-240° C.; Step 7, the flue gas discharged from the economizer (4) enters the bag filter (5), and the particulate matter generated by the combustion is removed by the ash remover (10) in the bag filter (5); Step 8, the flue gas discharged from the bag filter (5) at a temperature of 180 to 220° C. enters the SCR denitration device (6), and the nitrogen oxides escaping under low temperature conditions are converted into nitrogen in the SCR denitration device (6); Step 9: The flue gas exhausted from the SCR denitration device (6) is heat-exchanged with the combustion-supporting air provided by the combustion-supporting air fan (15) in the flue gas heat exchanger (7), and then drawn out through the induced draft fan (8) at a temperature not higher than 140° C. and discharged into the atmosphere through the chimney (9).

3. The incineration treatment process for high and low boiling waste liquids of ethylene-vinyl acetate plant according to claim 1 is characterized in that: In step 6, the water used for heat exchange of feed water is desalted water transported through a desalted water pipeline (17). The desalted water is deoxygenated by a deaerator (13) at a temperature of 104° C., and then is sent to an economizer (4) by a feed water pump (14). After being heated by waste heat of flue gas in the economizer (4), the water is sent to a waste heat boiler (3) for generating steam.

4. The process for incinerating high and low boiling waste liquids from an ethylene-based vinyl acetate plant according to claim 1, characterized in that: The incinerator (2) is set to operate under negative pressure, and the internal pressure of the incinerator (2) is maintained at -200 to -100 KPa by using the terminal induced draft fan (8).

5. The process for incinerating high and low boiling waste liquids from an ethylene-based vinyl acetate plant according to claim 1, characterized in that: The SCR denitration device (6) is configured as an SCR reactor, and two catalyst layers are arranged inside the SCR reactor, using a honeycomb catalyst.

6. The process for incinerating high and low boiling waste liquids from an ethylene-based vinyl acetate plant according to claim 1 is characterized by: An adjustable damper is arranged on the air outlet duct of the cooling fan (12) to control the opening of the adjustable damper and thus adjust the air supply volume.

7. The process for incinerating high and low boiling waste liquids from an ethylene-based vinyl acetate plant according to claim 1 is characterized by: The material sprayed by the SNCR spray gun (11) is a urea aqueous solution with a concentration of 5% to 10%, and the spraying amount is adjusted according to the nitrogen oxide value monitored online on the chimney (9).

8. The process for incinerating high and low boiling waste liquids from an ethylene-based vinyl acetate plant according to claim 1 is characterized by: The bag dust collector (5) adopts a pulse filter bag type high-efficiency dust collector, and according to the pressure difference before and after the bag dust collector (5) or by setting a timing, the bag dust collector (5) is automatically blown with compressed air.

9. An incineration treatment device for high and low boiling waste liquids of an ethylene-based vinyl acetate plant, characterized in that include: A waste liquid burner (1) is used to atomize high- and low-boiling waste liquids from a waste liquid pipeline (16) in an ethylene-based vinyl acetate device to obtain an atomized product; An incinerator (2), wherein the atomized material is sent into the incinerator (2) for incineration, so that the atomized material is fully oxidized, pyrolyzed and burned in the incinerator (2); A cooling fan (12) is used to supply cold air to the middle and bottom of the incinerator (2); SNCR spray guns (11) are arranged at multiple points in the middle of the incinerator (2) to reduce nitrogen oxides in the high-temperature flue gas into nitrogen through SNCR denitration; The waste heat boiler (3) sends the flue gas discharged from the bottom of the incinerator (2) into the waste heat boiler (3) and uses the heat of the flue gas to generate usable steam; Economizer (4), sending the flue gas discharged from the waste heat boiler (3) into the economizer (4), and realizing waste heat utilization through feed water heat exchange; A bag filter (5), the flue gas discharged from the economizer (4) enters the bag filter (5), and particulate matter generated by combustion is removed by an ash remover (10) in the bag filter (5); An SCR denitration device (6), in which the flue gas discharged from the bag filter (5) enters the SCR denitration device (6), and the nitrogen oxides escaping under low temperature conditions are converted into nitrogen in the SCR denitration device (6); The flue gas heat exchanger (7) is a flue gas heat exchanger (7). The flue gas discharged from the SCR denitration device (6) and the combustion-supporting air provided by the combustion-supporting air fan (15) are heat-exchanged in the flue gas heat exchanger (7), and then drawn out through the induced draft fan (8) and discharged into the atmosphere through the chimney (9).

10. The device for incinerating high and low boiling waste liquids from an ethylene-based vinyl acetate plant according to claim 9, characterized in that: A deaerator (13) and a feed water pump (14) are provided, and desalted water for feed water heat exchange is deoxygenated by the deaerator (13), and then sent to the economizer (4) by the feed water pump (14), and then heated by flue gas waste heat in the economizer (4) and sent to the waste heat boiler (3) for steam generation; the SCR denitration device (6) is configured as an SCR reactor; and the bag filter (5) adopts a pulse filter bag type high-efficiency dust collector.

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