Coking organic waste gas treatment device

Abstract

According to the coking organic waste gas treatment device provided by the invention, organic gas escaping from a crude benzene storage tank, non-condensable gas discharged from a benzene removal tower and high-oxygen organic waste gas discharged from an ammonium sulfate working section and treated by an ammonium sulfate tail gas pretreatment device are treated by a negative pressure system; the organic waste gas generated in the coking process of the coking plant is subjected to centralized innocent treatment through cooperative use of the equipment, the organic waste gas generated in the coking process of the coking plant is subjected to concentrated innocent treatment, and the organic waste gas generated in the coking process of the coking plant is subjected to high-oxygen waste gas treatment and high-oxygen waste gas discharged by an ammonia washing system. The device can effectively overcome the defect that organic waste gas is difficult to treat due to the fact that various tanks in the coal gas purification and chemical product recovery process are numerous, the VOCs diffusion points are many, the range is wide, and pollution components are complex, in addition, the device conducts harmless treatment on the organic waste gas in a combustion mode, and the device has the advantages of being low in treatment cost, easy to operate and good in treatment effect.

Description

Technical Field

[0001] This application relates to the field of waste gas treatment technology, and in particular to a coking organic waste gas treatment device. Background Technology

[0002] Volatile organic compounds, also known as VOCs, typically include non-methane hydrocarbons (alkanes, alkenes, alkynes, aromatic hydrocarbons, etc.), oxygenated organic compounds (aldehydes, ketones, alcohols, ethers, etc.), halogenated hydrocarbons, nitrogen-containing organic compounds, and sulfur-containing organic compounds. In an environmental context, VOCs refer to reactive, volatile organic compounds that participate in photochemical reactions. VOCs have an unpleasant odor and are irritating, corrosive, toxic, teratogenic, and carcinogenic. Benzene, toluene, and formaldehyde, in particular, can cause significant harm to human health. VOCs primarily irritate the eyes and respiratory tract. When VOCs reach a certain concentration, they can cause headaches, nausea, vomiting, and fatigue. In severe cases, they can even lead to convulsions, coma, damage to the liver, kidneys, brain, and nervous system, and serious consequences such as memory loss.

[0003] VOC emissions from the coking industry originate from coking, coal gas purification, and chemical product recovery. Due to the numerous tanks and vessels involved in the coal gas purification and chemical product recovery processes, VOC emissions are characterized by many release points, wide distribution, complex pollutant components, and difficulty in treatment. Utility Model Content

[0004] This application provides a coking organic waste gas treatment device to solve the problem that the above-mentioned VOCs have many emission points, wide distribution, and complex pollutant components, making it difficult to treat organic waste gas.

[0005] This application provides a coking organic waste gas treatment device, including a combustion furnace;

[0006] The combustion furnace is connected to the benzene removal tower and the condenser via a negative pressure system.

[0007] The combustion furnace is also connected to the ammonium sulfate tail gas pretreatment unit, the ammonia washing system, and the gas pipeline, respectively;

[0008] The condenser is connected to the crude benzene storage tank in a loop;

[0009] The ammonium sulfate tail gas pretreatment device is connected to the ammonium sulfate tail gas pipeline.

[0010] Optionally, the combustion furnace is connected to the ammonium sulfate tail gas pretreatment unit and the ammonia washing system via an oxygen detector;

[0011] The oxygen detector is also connected to the blower via a check valve;

[0012] Both the oxygen detector and the fan are electrically connected to the controller.

[0013] Optionally, the combustion furnace is also connected to the heat exchanger via a dust collector;

[0014] The combustion furnace and dust collector are connected in a loop.

[0015] Optionally, the ammonium sulfate tail gas pretreatment device includes a spray tower, and a spray layer and a distribution layer are arranged sequentially from top to bottom inside the spray tower;

[0016] The bottom of the spray tower is equipped with a liquid storage tank, which is connected to the spray layer through a circulating pump.

[0017] Optionally, the distribution layer includes a liquid receiving tray and multiple liquid distribution cones. The bottom of the liquid receiving tray has multiple mounting holes, and the multiple liquid distribution cones are installed in the mounting holes one by one, connecting the upper and lower surfaces of the liquid receiving tray.

[0018] The bottom of the liquid receiving tray is also provided with multiple liquid distribution holes.

[0019] Optionally, the liquid distribution cone includes a cone-shaped portion with its tip pointing vertically downward and a liquid distribution tube;

[0020] One end of the liquid distribution pipe is connected to the mounting hole at the bottom of the liquid receiving tray, and the other end is connected to the upper surface of the conical part;

[0021] The conical part is a closed structure, and multiple through holes are evenly opened along the circumference at the connection between the liquid distribution pipe and the conical part.

[0022] Alternatively, the dust collector may be a cyclone dust collector, an electrostatic precipitator, or a bag filter dust collector.

[0023] The coking organic waste gas treatment device of this application, through the setting of a negative pressure system, combines the organic gas escaping from the crude benzene storage tank and the non-condensable gas discharged from the benzene removal tower with the high-oxygen organic waste gas discharged from the ammonium sulfate section after being treated by the ammonium sulfate tail gas pretreatment device and the high-oxygen waste gas discharged from the ammonia washing system, and introduces them into the combustion furnace. Under the condition of using fuel gas supplied by the gas pipeline, combustion is carried out for harmless treatment. The device of this application, through the combined use of the above equipment, can centrally and harmlessly treat the organic waste gas generated in the coking process of the coking plant. It can effectively solve the disadvantages of the large number of tanks in the gas purification and chemical product recovery process, which have many VOCs emission points, wide range, and complex pollutant components, making it difficult to treat organic waste gas. In addition, the device of this application uses combustion to harmlessly treat organic waste gas, which has the characteristics of low treatment cost, easy operation, and good treatment effect. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic diagram of a coking organic waste gas treatment device provided in an embodiment of this application;

[0026] Figure 2 A schematic diagram of a coking organic waste gas treatment device provided in another embodiment of this application;

[0027] Figure 3 A schematic diagram of a coking organic waste gas treatment device provided in yet another embodiment of this application;

[0028] Figure 4 This is a schematic diagram of the structure of an ammonium sulfate tail gas pretreatment device provided in an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of the distribution layer structure provided in another embodiment of this application;

[0030] Figure 6 This is a schematic diagram of the liquid distribution cone provided in another embodiment of this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Combustion furnace; 2. Negative pressure system; 3. Benzene removal tower; 4. Condenser; 5. Ammonium sulfate tail gas pretreatment device; 6. Ammonia washing system; 7. Crude benzene storage tank; 8. Controller; 10. Gas pipeline; 11. Dust collector; 12. Heat exchanger; 20. Ammonium sulfate tail gas pipeline; 30. Oxygen detector; 40. Fan; 51. Spray tower; 52. Circulating pump; 511. Spray layer; 512. Distribution layer; 513. Liquid storage tank; 5101. Through hole; 5121. Liquid receiving tray; 5122. Liquid distribution cone; 51221. Conical part; 51222. Liquid distribution pipe. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0034] like Figure 1 As shown, this application provides a coking organic waste gas treatment device, including a combustion furnace 1;

[0035] Combustion furnace 1 is connected to benzene removal tower 3 and condenser 4 respectively via negative pressure system 2;

[0036] Combustion furnace 1 is also connected to ammonium sulfate tail gas pretreatment device 5, ammonia washing system 6 and gas pipeline 10 respectively;

[0037] Condenser 4 is connected to crude benzene storage tank 7 to form a loop;

[0038] The ammonium sulfate tail gas pretreatment device 5 is connected to the ammonium sulfate tail gas pipeline 20.

[0039] During use, the crude benzene storage tank 7 will release benzene vapors during the storage of crude benzene. These gases are drawn in by the negative pressure system 2. The drawn vapors are condensed by the condenser 4, which condenses the benzene and other condensable substances in them. The condensate obtained after condensation is transferred back to the crude benzene storage tank 7 for storage. Non-condensable gases (such as some low-boiling-point organic gases, air, etc.) are drawn into the negative pressure system 2. At the same time, the negative pressure system 2 collects and draws in the waste gas generated during the benzene removal process of the benzene removal tower 3. In the negative pressure system 2, the non-condensable gases from the crude benzene storage tank 7 and the organic waste gas from the benzene removal tower 3 are combined and fed into the combustion furnace 1 for combustion.

[0040] The waste gas from the ammonium sulfate tail gas pipeline 20 is an organic waste gas containing sulfur and has a high oxygen content. It cannot be directly incinerated and requires pre-treatment for desulfurization before being sent to the combustion furnace 1. After treatment in the ammonium sulfate tail gas pretreatment device 5, the waste gas from the ammonium sulfate section is combined with the waste gas from the ammonia washing system 6 (characterized by low organic matter but high oxygen content) and then introduced into the combustion furnace 1 as a combustion aid. When oxygen is insufficient, it can be supplemented to the combustion furnace 1 through appropriate equipment.

[0041] At the same time, the gas pipeline 10 introduces gas (such as purified coal gas from the factory) into the combustion furnace 1 for use as fuel to burn the aforementioned waste gas. The flue gas after combustion is basically composed of carbon dioxide and water vapor. At this point, the flue gas can be detected and discharged, or collected and treated in the tail gas treatment section.

[0042] The coking organic waste gas treatment device of this application, through the negative pressure system 2, combines the organic gas escaping from the crude benzene storage tank and the non-condensable gas discharged from the benzene removal tower 3 with the high-oxygen organic waste gas discharged from the ammonium sulfate section after being treated by the ammonium sulfate tail gas pretreatment device 5 and the high-oxygen waste gas discharged from the ammonia washing system 6, and introduces them into the combustion furnace 1. Under the condition of the gas supplied by the gas pipeline 10 as fuel, the gas is burned for harmless treatment. The device of this application, through the combined use of the above equipment, can centrally and harmlessly treat the organic waste gas generated during the coking process of the coking plant. It can effectively solve the disadvantages of the large number of tanks in the gas purification and chemical product recovery process, which have many VOCs emission points, wide range, and complex pollutant components, making it difficult to treat organic waste gas. In addition, the device of this application uses combustion to harmlessly treat organic waste gas, which has the characteristics of low treatment cost, easy operation, and good treatment effect.

[0043] like Figure 2As shown, optionally, the combustion furnace 1 is connected to the ammonium sulfate tail gas pretreatment device 5 and the ammonia washing system 6 via the oxygen detector 30;

[0044] The oxygen detector 30 is also connected to the blower 40 via a check valve;

[0045] Both the oxygen detector 30 and the fan 40 are electrically connected to the controller 8.

[0046] In this application, the treated waste gas output from the ammonium sulfate tail gas pretreatment device 5 is combined with the waste gas from the ammonia washing system 6 (which is characterized by low organic matter and high oxygen content). The oxygen concentration is detected by the oxygen detector 30 and the value is fed back to the controller 8. When the oxygen content in the input waste gas is detected to be lower than the preset value, the controller 8 starts the fan to combine the outside air with the waste gas and introduce it into the combustion furnace 1 as a combustion aid.

[0047] like Figure 3 As shown, optionally, the combustion furnace 1 is also connected to the heat exchanger 12 via a dust collector 11;

[0048] The combustion furnace 1 and the dust collector 11 are connected in a loop.

[0049] In this application, the gas pipeline 10 introduces natural gas (such as purified coal gas from a factory) into the combustion furnace 1 for use as fuel. The aforementioned waste gas is burned, and the resulting flue gas is primarily composed of carbon dioxide and water vapor. The flue gas is then passed through a dust collector 11 to remove the solid particulate matter produced during combustion (some organic matter has a large molecular weight and may not burn completely in the combustion furnace 1, producing carbon particles; these particles can be reused as fuel for secondary combustion to ensure complete combustion). The flue gas is then cooled by a heat exchanger 12 before being discharged or collected for treatment in the tail gas treatment section. The particulate matter intercepted by the dust collector 11 is then reintroduced into the combustion furnace 1 for combustion.

[0050] like Figure 4 As shown, optionally, the ammonium sulfate tail gas pretreatment device 5 includes a spray tower 51, and a spray layer 511 and a distribution layer 512 are arranged sequentially from top to bottom inside the spray tower 51.

[0051] A liquid storage tank 513 is provided at the bottom of the spray tower 51, and the liquid storage tank 513 is connected to the spray layer 511 through a circulation pump 52.

[0052] In this application, the waste gas from the ammonium sulfate section output from the ammonium sulfate tail gas pipeline 20 is an organic waste gas containing sulfur and has a high oxygen content. It cannot be directly incinerated and needs to be pre-treated for desulfurization before being sent to the combustion furnace 1. When the waste gas from the ammonium sulfate section is treated in the ammonium sulfate tail gas pretreatment device 5, the waste gas is introduced into the spray tower 51. The waste gas travels from bottom to top, while the spray layer 511 sprays the absorbent liquid (alkaline solution, such as lime milk) from top to bottom. The sprayed absorbent liquid falls into the distribution layer 512, where it is redistributed and comes into contact with the waste gas for washing before falling back down. The washed waste gas is then demisted by the demister at the top of the tower before being output to avoid excessive humidity in the output waste gas, which would affect the combustion effect. The absorbent liquid that has absorbed sulfur and other acidic substances falls into the storage tank 513 at the bottom of the tower and is then circulated back to the spray layer 511 by the circulation pump 52 for reuse.

[0053] like Figure 5 As shown, optionally, the distribution layer 512 includes a liquid receiving tray 5121 and a plurality of liquid distribution cones 5122. The bottom of the liquid receiving tray 5121 is provided with a plurality of mounting holes, and the plurality of liquid distribution cones 5122 are installed in the mounting holes one by one, connecting the upper and lower surfaces of the liquid receiving tray 5121.

[0054] The bottom of the liquid receiving tray 5121 is also provided with multiple liquid distribution holes.

[0055] In this application, when the absorbent liquid sprayed from the spray layer 511 falls into the distribution layer 512, it first falls into the receiving tray 5121. Part of the absorbent liquid falls through the distribution hole at the bottom of the receiving tray, and the other part falls into the distribution cone 5122, and then falls after distribution.

[0056] like Figure 6 As shown, optionally, the liquid distribution cone 5122 includes a cone-shaped portion 51221 with its tip pointing vertically downward and a liquid distribution tube 51222;

[0057] One end of the liquid distribution pipe 51222 is connected to the mounting hole at the bottom of the liquid receiving tray 5121, and the other end is connected to the upper surface of the conical part 51221.

[0058] The conical part 51221 is a closed structure, and multiple through holes 5101 are evenly provided circumferentially at the connection between the liquid distribution pipe 51222 and the conical part 51221.

[0059] In this application, when the sprayed absorbent liquid falls onto the distribution layer 512, it first falls into the receiving tray 5121. A portion of the absorbent liquid falls through the distribution holes at the bottom of the receiving tray, while the other portion enters the distribution pipe 51222 and flows out through the circumferentially opened distribution holes at the bottom of the distribution pipe 51222. The outflowing absorbent liquid flows down along the side of the conical portion 51221 and forms a liquid film on the surface of the conical portion 51221. This increases the contact area between the absorbent liquid and the waste gas, thereby facilitating the removal of sulfur and acidic substances from the waste gas. During its descent, the absorbent liquid distributed on the surface of the conical portion 51221 converges along its surface and drips down to the tip, where it, along with the absorbent droplets leaking from the through holes, comes into countercurrent contact with the upward-flowing waste gas, removing sulfur and other substances from the waste gas.

[0060] Optionally, the dust collector 11 is a cyclone dust collector, an electrostatic precipitator, or a bag filter dust collector.

[0061] In this application, the dust collector 11 is selected from cyclone dust collectors, electrostatic precipitators or bag dust collectors. The above types of dust collectors are easy to maintain, operate and install.

[0062] A coking organic waste gas treatment device, the working process of which is as follows:

[0063] During use, the crude benzene storage tank 7 releases benzene vapor and other waste gases during the storage of crude benzene. These gases are drawn in by the negative pressure system 2. The drawn-in vapor passes through the condenser 4 to condense condensable substances such as benzene, and the resulting condensate is transferred back to the crude benzene storage tank 7 for storage. Non-condensable gases (such as some low-boiling-point organic gases, air, etc.) are drawn into the negative pressure system 2. At the same time, the negative pressure system 2 draws in and collects the waste gas generated during the benzene removal process of the benzene removal tower 3. In the negative pressure system 2, the non-condensable gases from the crude benzene storage tank 7 and the organic waste gas from the benzene removal tower 3 are combined and fed into the combustion furnace 1 for combustion.

[0064] The waste gas from the ammonium sulfate section output from the ammonium sulfate tail gas pipeline 20 is an organic waste gas containing sulfur and has a high oxygen content. It cannot be directly incinerated and needs to be pre-treated for desulfurization before being sent into the combustion furnace 1. When the waste gas from the ammonium sulfate section is treated in the ammonium sulfate tail gas pretreatment device 5, the waste gas is introduced into the spray tower 51. The waste gas travels from bottom to top, while the spray layer 511 sprays the absorbent liquid (alkaline solution, such as lime milk) from top to bottom. When the sprayed absorbent liquid falls into the distribution layer 512, it first falls into the receiving tray 5121. Part of the absorbent liquid falls through the distribution hole at the bottom of the receiving tray, and the other part enters the distribution pipe 51222. Then it flows out through the distribution hole circumferentially opened at the bottom of the distribution pipe 51222. The outflowing absorbent liquid flows down along the side of the conical part 51221 and forms a liquid film on the surface of the conical part 51221. This increases the contact area between the absorbent liquid and the waste gas, which is beneficial for removing sulfur and acidic substances from the waste gas. The absorbent liquid distributed on the surface of the conical section 51221, during its descent, converges along its surface to the tip and drips down, coming into countercurrent contact with the upward-flowing exhaust gas along with the absorbent droplets leaking from the through-holes. This process removes sulfur and other substances from the exhaust gas. The washed exhaust gas is then demisted by the demister at the top of the tower before being output to prevent excessive humidity from affecting combustion efficiency. The absorbent liquid that has absorbed sulfur and other acidic substances falls into the storage tank 513 at the bottom of the tower and is then circulated by the circulation pump 52 to the spray layer 511 for reuse.

[0065] The treated waste gas output from the ammonium sulfate tail gas pretreatment device 5 is combined with the waste gas from the ammonia washing system 6 (which is characterized by low organic matter and high oxygen content). The oxygen concentration is detected by the oxygen detector 30 and the value is fed back to the controller 8. When the oxygen content in the input waste gas is detected to be lower than the preset value, the controller 8 starts the fan to combine the outside air with the waste gas and introduce it into the combustion furnace 1 as a combustion aid.

[0066] Simultaneously, gas pipeline 10 introduces natural gas (such as purified coal gas from the factory) into combustion furnace 1 for use as fuel, burning the aforementioned waste gas. The resulting flue gas is primarily composed of carbon dioxide and water vapor. The flue gas is then passed through dust collector 11 to remove solid particulate matter produced during combustion (some organic matter has a larger molecular weight, and incomplete combustion in combustion furnace 1 produces carbon particles; these particles can be reused as fuel for secondary combustion to ensure complete combustion). After heat exchange with heat exchanger 12, the flue gas is either discharged or collected for treatment in the tail gas treatment section. The particulate matter intercepted by dust collector 11 is then reintroduced into combustion furnace 1 for further combustion.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A coking organic waste gas treatment device, characterized in that, Including the combustion furnace (1); The combustion furnace (1) is connected to the benzene removal tower (3) and the condenser (4) respectively through a negative pressure system (2); The combustion furnace (1) is also connected to the ammonium sulfate tail gas pretreatment device (5), the ammonia washing system (6) and the gas pipeline (10), respectively; The condenser (4) is connected to the crude benzene storage tank (7) in a loop; The ammonium sulfate tail gas pretreatment device (5) is connected to the ammonium sulfate tail gas pipeline (20).

2. The coking organic waste gas treatment device according to claim 1, characterized in that, The combustion furnace (1) is connected to the ammonium sulfate tail gas pretreatment device (5) and the ammonia washing system (6) respectively via an oxygen detector (30); The oxygen detector (30) is also connected to the blower (40) via a check valve; The oxygen detector (30) and the fan (40) are both electrically connected to the controller (8).

3. The coking organic waste gas treatment device according to claim 1, characterized in that, The combustion furnace (1) is also connected to the heat exchanger (12) via a dust collector (11); The combustion furnace (1) and the dust collector (11) are connected in a loop.

4. The coking organic waste gas treatment device according to claim 1, characterized in that, The ammonium sulfate tail gas pretreatment device (5) includes a spray tower (51), and a spray layer (511) and a distribution layer (512) are arranged sequentially from top to bottom inside the spray tower (51). The bottom of the spray tower (51) is provided with a liquid storage tank (513), which is connected to the spray layer (511) through a circulation pump (52).

5. The coking organic waste gas treatment device according to claim 4, characterized in that, The distribution layer (512) includes a liquid receiving tray (5121) and a plurality of liquid distribution cones (5122). The bottom of the liquid receiving tray (5121) is provided with a plurality of mounting holes. The plurality of liquid distribution cones (5122) are installed in the mounting holes one by one, and the upper and lower surfaces of the liquid receiving tray (5121) are connected. The bottom of the liquid receiving tray (5121) is also provided with multiple liquid distribution holes.

6. The coking organic waste gas treatment device according to claim 5, characterized in that, The liquid distribution cone (5122) includes a cone-shaped portion (51221) with its tip pointing vertically downward and a liquid distribution tube (51222). One end of the liquid distribution pipe (51222) is connected to the mounting hole at the bottom of the liquid receiving tray (5121), and the other end is connected to the upper surface of the conical part (51221). The conical part (51221) is a closed structure, and multiple through holes (5101) are evenly provided circumferentially at the connection between the liquid distribution pipe (51222) and the conical part (51221).

7. The coking organic waste gas treatment device according to claim 3, characterized in that, The dust collector (11) is a cyclone dust collector, an electrostatic precipitator, or a bag filter dust collector.

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