Comprehensive utilization device for coke oven gas
The coke oven gas is processed through heat exchange, deoxygenation and separation devices, and the problems of oxygen and naphthalene debris are solved, and the heat recovery and stable operation of the process are achieved.
Patent Information
- Application Number
- CN202422295706.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-09-20
AI Technical Summary
The coke oven gas contains debris such as oxygen and naphthalene, which makes it impossible to operate stably and safely in the subsequent process, and the heat of the high-temperature gas after refined desulfurization cannot be effectively recycled and utilized.
The heat of the coke oven gas is recovered by the first and second heat exchange devices, oxygen and naphthalene are removed by deoxygenation and cooling devices, and naphthalene is separated by the separation device to form low-pressure steam and purified gas.
The removal of oxygen and naphthalene in coke oven gas is achieved, and the heat of high-temperature gas is fully utilized, ensuring the stable operation of subsequent processes and the effective recovery of heat.
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Figure CN223292495U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of coal gas processing, and in particular to a device for comprehensive utilization of coke oven gas. Background Art
[0002] Coke oven gas (COG) is a combustible gas produced by high-temperature carbonization in a coke oven, when coking coal is prepared from several types of bituminous coal. It is a byproduct of the coking industry, consisting primarily of hydrogen and methane, with small amounts of carbon monoxide, carbon dioxide, nitrogen, oxygen, and other gases.
[0003] One important way to utilize coke oven gas is to extract high-purity hydrogen from a membrane separation unit after dust removal and desulfurization. However, after desulfurization and other processes, the coke oven gas still contains impurities such as oxygen and naphthalene. This can hinder the stable and safe operation of subsequent processes, and the heat from the high-temperature gas after fine desulfurization cannot be effectively recovered. Summary of the Invention
[0004] The embodiment of the present application solves the technical problem that the coke oven gas after desulfurization and other processes still contains impurities such as oxygen and naphthalene, and the heat of the high-temperature gas after fine desulfurization cannot be effectively recovered and utilized by providing a comprehensive utilization device for coke oven gas.
[0005] The embodiment of the present application provides a coke oven gas comprehensive utilization device, comprising: a first heat exchange device, wherein the two inlets of the first heat exchange device are respectively connected to a fine desulfurization device and a desalted water network, and the first outlet of the first heat exchange device is connected to a low-pressure steam network; in the first heat exchange device, the desalted water absorbs the heat of the fine desulfurized coke oven gas to form low-pressure steam, and enters the low-pressure steam network; a second heat exchange device, wherein the two inlets of the second heat exchange device are connected to the second outlet of the first heat exchange device and a rough desulfurization device; in the second heat exchange device, the rough desulfurized coke oven gas absorbs the heat of the fine desulfurized coke oven gas; a deoxidation device, The inlet of the deoxygenator is connected to the first outlet of the second heat exchange device, and the outlet of the deoxygenator is connected to the fine desulfurization device; the crude desulfurized coke oven gas enters the deoxygenator from the second heat exchange device, and enters the fine desulfurization device after deoxygenation; a cooling device, the inlet of the cooling device is connected to the second outlet of the second heat exchange device, and the fine desulfurized coke oven gas enters the cooling device from the second heat exchange device; and a separation device, the inlet of the separation device is connected to the outlet of the cooling device, and the outlet of the separation device is connected to the hydrogen extraction device, and the separation device is used to separate naphthalene from the fine desulfurized coke oven gas.
[0006] In one possible implementation, the separation device includes a gas-liquid separator, at least one composite high-efficiency separator and a vent pipeline; the inlet of the gas-liquid separator is connected to the outlet of the cooling device, the bottom outlet of the gas-liquid separator is connected to the waste liquid pipeline network, and the top outlet of the gas-liquid separator is connected to the inlet of the at least one composite high-efficiency separator; the first bottom outlet of the at least one composite high-efficiency separator is connected to the waste liquid pipeline network, and the top outlet of the at least one composite high-efficiency separator is connected to the hydrogen extraction device; one end of the vent pipeline is connected to the vent main pipe, and the other end of the vent pipeline is connected to the top outlet of the gas-liquid separator and the top outlet of the at least one composite high-efficiency separator.
[0007] In one possible implementation, the separation device also includes a hot water pump, a flushing pipeline and a waste liquid collection tank; the at least one composite high-efficiency separator includes two composite high-efficiency separators, and the two composite high-efficiency separators are arranged in parallel; the hot water pump is arranged in the flushing pipeline, one end of the flushing pipeline is connected to the second bottom outlet of the two composite high-efficiency separators, and the other end of the flushing pipeline is connected to the first flushing inlet of the two composite high-efficiency separators; the waste liquid collection tank is connected to the second bottom outlet of the two composite high-efficiency separators through a pipeline; wherein the low-pressure steam pipeline is connected to the second flushing inlet of the two composite high-efficiency separators, and the flushing pipeline is connected to the desalted water pipeline network or the steam condensate pipeline network.
[0008] In a possible implementation, the separation device further includes: a waste liquid conveying device, which is installed in the waste liquid collection tank and connected to the biochemical treatment device, for conveying the waste liquid in the waste liquid collection tank to the biochemical treatment device.
[0009] In one possible implementation, the cooling device includes a first heat exchanger and a second heat exchanger arranged in parallel; the first inlet of the first heat exchanger is connected to the second outlet of the second heat exchanger, and the first outlet of the first heat exchanger is connected to the first inlet of the second heat exchanger; the second inlet and the second outlet of the first heat exchanger are both connected to the desalted water network to heat the desalted water; the first outlet of the second heat exchanger is connected to the separation device; the second inlet and the second outlet of the second heat exchanger are respectively connected to the circulating water supply pipe and the circulating water return pipe.
[0010] In a possible implementation, the coke oven gas comprehensive utilization device further includes: a heater, the outlet of the deoxidation device is connected to the fine desulfurization device through the heater, and the heater is used to heat the deoxidized crude desulfurized coke oven gas and transport it to the fine desulfurization device.
[0011] In a possible implementation, the coke oven gas comprehensive utilization device further includes: a short-circuit pipe, with both ends of the short-circuit pipe respectively connected to the second outlet of the first heat exchange device and the inlet of the cooling device.
[0012] The technical solutions provided in the embodiments of this application have at least the following technical effects:
[0013] The embodiment of the present application provides a coke oven gas comprehensive utilization device, which includes a first heat exchange device, a second heat exchange device, a deoxidation device, a cooling device and a separation device; the refined desulfurized coke oven gas entering the first heat exchange device heats the deoxidized water into low-pressure steam; the refined desulfurized coke oven gas coming out of the first heat exchange device enters the second heat exchange device, and the crude desulfurized coke oven gas enters the second heat exchange device and absorbs the heat of the refined desulfurized coke oven gas; the crude desulfurized coke oven gas coming out of the second heat exchange device enters the deoxidation device for deoxidation, and then enters the refined desulfurization device; the refined desulfurized coke oven gas coming out of the second heat exchange device enters the cooling device for further cooling, and the refined desulfurized coke oven gas after cooling enters the separation device, which separates and processes the naphthalene in the refined desulfurized coke oven gas. Therefore, the coke oven gas comprehensive utilization device fully utilizes the heat of the refined desulfurized coke oven gas and removes oxygen and naphthalene in the coke oven gas. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0015] Figure 1 A schematic structural diagram of a coke oven gas comprehensive utilization device provided in an embodiment of the present application;
[0016] Figure 2 A schematic diagram of the structure of the separation device provided in an embodiment of the present application.
[0017] Description of reference numerals:
[0018] 100-first heat exchange device; 200-second heat exchange device; 210-heat exchanger; 300-deoxygenation device; 400-cooling device; 410-first heat exchanger; 420-second heat exchanger; 500-separation device; 510-gas-liquid separator; 520-composite high-efficiency separator; 530-vent pipe; 540-hot water pump; 550-flushing pipe; 560-waste liquid collection tank; 570-waste liquid conveying device; 600-heater; 700-short-circuit pipe. DETAILED DESCRIPTION
[0019] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.
[0020] In the description of the embodiments of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present application. The terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the internal parts of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0021] The embodiment of the present application provides a coke oven gas comprehensive utilization device, such as Figure 1 As shown, the coke oven gas comprehensive utilization device includes a first heat exchange device 100 , a second heat exchange device 200 , a deoxidation device 300 , a cooling device 400 and a separation device 500 .
[0022] The two inlets of the first heat exchanger 100 are connected to the fine desulfurization unit and the desalted water network, respectively. The first outlet of the first heat exchanger 100 is connected to the low-pressure steam network. Within the first heat exchanger 100, the desalted water absorbs heat from the fine desulfurized coke oven gas to form low-pressure steam, which then enters the low-pressure steam network.
[0023] Specifically, the crude desulfurized coke oven gas undergoes hydrodesulfurization in the fine desulfurization device to form fine desulfurized coke oven gas. The fine desulfurized coke oven gas exiting the fine desulfurization device has a relatively high temperature. After exiting the fine desulfurization device, the fine desulfurized coke oven gas enters the first heat exchange device 100. Simultaneously, desalted water from the desalted water network also enters the first heat exchange device 100. In the first heat exchange device 100, the fine desulfurized coke oven gas heats the desalted water, vaporizing it into low-pressure steam. The low-pressure steam then exits the first outlet of the first heat exchange device and enters the low-pressure steam network. The low-pressure steam in the low-pressure steam network can be used for equipment cleaning, for example.
[0024] Illustratively, the first heat exchange device 100 may be a boiler, and the refined desulfurized coke oven gas entering the boiler heats the desalted water entering the boiler, vaporizing the desalted water into low-pressure steam.
[0025] The first heat exchange device 100 recycles the heat of the finely desulfurized coke oven gas and also cools the finely desulfurized coke oven gas, thereby facilitating the subsequent removal of naphthalene from the finely desulfurized coke oven gas.
[0026] The two inlets of the second heat exchange device 200 are connected to the second outlet of the first heat exchange device 100 and the rough desulfurization device. In the second heat exchange device 200, the rough desulfurized coke oven gas absorbs heat from the fine desulfurized coke oven gas.
[0027] Specifically, the refined desulfurized coke oven gas coming out of the first heat exchange device 100 still has a relatively high temperature. In the second heat exchange device 200, the crude desulfurized coke oven gas and the refined desulfurized coke oven gas undergo heat exchange, so that the temperature of the crude desulfurized coke oven gas increases, which facilitates the subsequent refined desulfurization process of the crude desulfurized coke oven gas. At the same time, the temperature of the refined desulfurized coke oven gas further decreases.
[0028] For example, Figure 1 The second heat exchange device 200 shown includes two heat exchangers 210 connected in series. The refined desulfurized coke oven gas from the first heat exchange device 100 and the crude desulfurized coke oven gas from the crude desulfurization device pass through the two heat exchangers 210 in sequence, and the flow directions of the refined desulfurized coke oven gas and the crude desulfurization device are opposite.
[0029] The second heat exchange device 200 realizes further recovery of heat of the fine desulfurized coke oven gas, heats the crude desulfurized coke oven gas, facilitates the fine desulfurization process of the crude desulfurized coke oven gas, and further reduces the temperature of the fine desulfurized coke oven gas, facilitating the subsequent naphthalene removal of the fine desulfurized coke oven gas.
[0030] The inlet of the deoxidizer 300 is connected to the first outlet of the second heat exchanger 200, and the outlet of the deoxidizer 300 is connected to the fine desulfurization device. The crude desulfurized coke oven gas enters the deoxidizer 300 from the second heat exchanger 200 and enters the fine desulfurization device after deoxidation.
[0031] The deoxidation device 300 can remove oxygen from the raw desulfurized coke oven gas. Figure 1 As shown, the deoxidation device 300 can be a deoxidation tank, which is connected to a temperature-raising and vulcanizing main pipe. The temperature-raising and vulcanizing main pipe heats the deoxidation tank so that the deoxidation tank reaches the temperature required for deoxidation.
[0032] The inlet of the cooling device 400 is connected to the second outlet of the second heat exchange device 200 , and the refined desulfurized coke oven gas enters the cooling device 400 from the second heat exchange device 200 .
[0033] After the refined desulfurized coke oven gas from the second heat exchange device 200 enters the cooling device 400 , the temperature is further reduced, and the naphthalene is liquefied, so that the naphthalene in the refined desulfurized coke oven gas can be separated in the subsequent separation device 500 .
[0034] The inlet of the separation device 500 is connected to the outlet of the cooling device 400, and the outlet of the separation device 500 is connected to the hydrogen extraction device. The separation device 500 is used to separate naphthalene from the refined desulfurized coke oven gas.
[0035] The naphthalene in the refined desulfurized coke oven gas exiting the cooling device 400 is in liquid form. The separator 500 separates the liquid naphthalene, thereby removing the naphthalene from the refined desulfurized coke oven gas. The refined desulfurized coke oven gas exiting the separator 500 enters a hydrogen extraction device for hydrogen extraction. Exemplarily, the hydrogen extraction device can be a membrane separation device. After passing through the separator 500, naphthalene is removed from the refined desulfurized coke oven gas, preventing naphthalene particles from accumulating and clogging the membrane pores.
[0036] like Figure 2 As shown, in an embodiment of the present application, the separation device 500 includes a gas-liquid separator 510, at least one composite high-efficiency separator 520 and a venting pipeline 530. The inlet of the gas-liquid separator 510 is connected to the outlet of the cooling device 400, the bottom outlet of the gas-liquid separator 510 is connected to the waste liquid pipeline network, and the top outlet of the gas-liquid separator 510 is connected to the inlet of at least one composite high-efficiency separator 520. The first bottom outlet of at least one composite high-efficiency separator 520 is connected to the waste liquid pipeline network, and the top outlet of at least one composite high-efficiency separator 520 is connected to the hydrogen extraction device. One end of the venting pipeline 530 is connected to the venting main pipe, and the other end of the venting pipeline 530 is connected to the top outlet of the gas-liquid separator 510 and the top outlet of at least one composite high-efficiency separator 520.
[0037] The gas-liquid separator 510 separates the gas and liquid in the refined desulfurized coke oven gas. The gas enters the composite high-efficiency separator 520 from the top outlet of the gas-liquid separator 510, while the liquid naphthalene and water exit from the bottom outlet of the gas-liquid separator 510 and enter the waste liquid pipeline network. The composite high-efficiency separator 520 incorporates multiple separation technologies, such as gravity settling, cyclonic separation, and filtration, to further remove naphthalene from the refined desulfurized coke oven gas entering it, resulting in a more thorough removal of naphthalene. The liquid exiting the first bottom outlet of the composite high-efficiency separator 520 enters the waste liquid pipeline network, while the refined desulfurized coke oven gas exiting the top outlet of the composite high-efficiency separator 520 enters the hydrogen extraction device. When the pressure in the gas-liquid separator 510 or the composite high-efficiency separator 520 exceeds the set value, the refined desulfurized coke oven gas enters the vent main via the vent line 530.
[0038] Continue to refer to Figure 2 As shown, the separation device 500 also includes a hot water pump 540, a flushing pipeline 550, and a waste liquid collection tank 560. The separation device 500 includes two composite high-efficiency separators 520, which are arranged in parallel. The hot water pump 540 is arranged in the flushing pipeline 550. One end of the flushing pipeline 550 is connected to the second bottom outlet of the two composite high-efficiency separators 520, and the other end of the flushing pipeline 550 is connected to the first flushing inlet of the two composite high-efficiency separators 520. The waste liquid collection tank 560 is connected to the second bottom outlet of the two composite high-efficiency separators 520 via a pipeline. The low-pressure steam pipeline network is connected to the second flushing inlet of the two composite high-efficiency separators 520, and the flushing pipeline 550 is connected to the desalted water pipeline network or the steam condensate pipeline network.
[0039] When the separation device 500 is in operation, one composite high-efficiency separator 520 is in operation, and the other composite high-efficiency separator 520 is in standby mode.
[0040] The composite high-efficiency separator 520 in working state removes naphthalene from the refined desulfurized coke oven gas. The liquid flowing out from its second bottom outlet enters the waste liquid collection tank 560 for temporary storage, and the gas flowing out from its top outlet enters the hydrogen extraction device.
[0041] Desalted water in the desalted water network or steam condensate in the steam condensate network enters the flushing pipeline 550. The hot water pump 540 transports the desalted water or steam condensate in the flushing pipeline 550 to the first flushing port of the standby composite high-efficiency separator 520, where it enters the standby composite high-efficiency separator 520 for flushing. Furthermore, low-pressure steam in the low-pressure steam network enters the standby composite high-efficiency separator 520 through the second flushing port. Liquid flowing out of the second bottom outlet of the standby composite high-efficiency separator 520 is transported by the hot water pump 540 and enters the standby composite high-efficiency separator 520 through the first flushing port for recycling.
[0042] Continue to refer to Figure 2 As shown, the separation device 500 further includes a waste liquid conveying device 570, which is installed in the waste liquid collection tank 560 and connected to the biochemical treatment device for conveying the waste liquid in the waste liquid collection tank 560 to the biochemical treatment device. Exemplarily, the waste liquid conveying device 570 can be a submersible pump installed in the waste liquid collection tank 560.
[0043] like Figure 1 As shown, the cooling device 400 includes a first heat exchanger 410 and a second heat exchanger 420 arranged in parallel. The first inlet of the first heat exchanger 410 is connected to the second outlet of the second heat exchanger 200, and the first outlet of the first heat exchanger 410 is connected to the first inlet of the second heat exchanger 420. The second inlet and second outlet of the first heat exchanger 410 are both connected to the desalted water network to heat the desalted water. The first outlet of the second heat exchanger 420 is connected to the separation device 500; the second inlet and second outlet of the second heat exchanger 420 are connected to the circulating water supply pipe and the circulating water return pipe, respectively.
[0044] When the cooling device 400 is in operation, cold desalted water from the desalted water network enters through the second inlet of the first heat exchanger 410. The refined desulfurized coke oven gas heats the cold desalted water in the first heat exchanger 410, which in turn cools the refined desulfurized coke oven gas. Hot desalted water then flows out of the second outlet of the first heat exchanger 410 and back into the desalted water network. This coke oven gas comprehensive utilization device further recycles the heat of the refined desulfurized coke oven gas through the first heat exchanger 410. The desulfurized coke oven gas flowing out of the first heat exchanger 410 enters the second heat exchanger 420. Circulating water from the circulating water supply pipe flows into the second inlet of the second heat exchanger 420. In the second heat exchanger 420, the circulating water cools the refined desulfurized coke oven gas. The circulating water then flows out of the second outlet of the second heat exchanger 420 and flows into the circulating water return pipe.
[0045] The coke oven gas comprehensive utilization device provided in this embodiment also includes a heater 600. The outlet of the deoxidation device 300 is connected to the fine desulfurization device via heater 600. Heater 600 is used to heat the deoxidized, crude desulfurized coke oven gas and transport it to the fine desulfurization device. Heater 600 heats the crude desulfurized coke oven gas to the temperature required by the fine desulfurization device, ensuring smooth desulfurization.
[0046] The coke oven gas comprehensive utilization device provided in the embodiment of the present application further includes a short-circuit pipe 700 , the two ends of which are respectively connected to the second outlet of the first heat exchange device 100 and the inlet of the cooling device 400 .
[0047] When the temperature of the crude desulfurized coke oven gas coming out of the heater 600 is high, the short-circuit pipe 700 can be controlled to open so that the refined desulfurized coke oven gas can directly enter the cooling device 400 after coming out of the first heat exchange device 100 without heating the crude desulfurized coke oven gas.
[0048] For example, an electric valve can be set in the short-circuit pipe 700, and a temperature detection device can be set at the outlet of the heater 600. The temperature detection device is connected to the electric valve signal. When the temperature detection device retrieves that the temperature of the crude desulfurized coke oven gas coming out of the heater 600 is higher than the set value, the electric valve opens the short-circuit pipe 700, so that the second outlet of the first heat exchange device 100 and the inlet of the cooling device 400 are connected.
[0049] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.
[0050] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.
Claims
1. A coke oven gas comprehensive utilization device, characterized in that: include: a first heat exchange device, wherein two inlets of the first heat exchange device are respectively connected to the fine desulfurization device and the desalted water pipe network, and a first outlet of the first heat exchange device is connected to the low-pressure steam pipe network; in the first heat exchange device, the desalted water absorbs heat from the fine desulfurized coke oven gas to form low-pressure steam, and then enters the low-pressure steam pipe network; a second heat exchange device, wherein two inlets of the second heat exchange device are connected to the second outlet of the first heat exchange device and the rough desulfurization device; in the second heat exchange device, the rough desulfurized coke oven gas absorbs heat from the fine desulfurized coke oven gas; a deoxidation device, wherein the inlet of the deoxidation device is connected to the first outlet of the second heat exchange device, and the outlet of the deoxidation device is connected to the fine desulfurization device; The crude desulfurized coke oven gas enters the deoxidation device from the second heat exchange device, and enters the fine desulfurization device after deoxidation; a cooling device, wherein the inlet of the cooling device is connected to the second outlet of the second heat exchange device, and the refined desulfurized coke oven gas enters the cooling device from the second heat exchange device; as well as A separation device, the inlet of which is connected to the outlet of the cooling device, the outlet of which is connected to the hydrogen extraction device, and the separation device is used to separate naphthalene from the refined desulfurized coke oven gas.
2. The coke oven gas comprehensive utilization device according to claim 1, characterized in that: The separation device includes a gas-liquid separator, at least one composite high-efficiency separator and a venting pipeline; The inlet of the gas-liquid separator is connected to the outlet of the cooling device, the bottom outlet of the gas-liquid separator is connected to the waste liquid pipe network, and the top outlet of the gas-liquid separator is connected to the inlet of the at least one composite high-efficiency separator; The first bottom outlet of the at least one composite high-efficiency separator is connected to the waste liquid pipe network, and the top outlet of the at least one composite high-efficiency separator is connected to the hydrogen extraction device; One end of the vent pipeline is connected to the vent main pipe, and the other end of the vent pipeline is connected to the top outlet of the gas-liquid separator and the top outlet of the at least one composite high-efficiency separator.
3. The coke oven gas comprehensive utilization device according to claim 2, characterized in that: The separation device further includes a hot water pump, a flushing pipeline and a waste liquid collection tank; the at least one composite high-efficiency separator includes two composite high-efficiency separators, and the two composite high-efficiency separators are arranged in parallel; The hot water pump is provided in the flushing pipeline, one end of the flushing pipeline is connected to the second bottom outlet of the two composite high-efficiency separators, and the other end of the flushing pipeline is connected to the first flushing inlet of the two composite high-efficiency separators; The waste liquid collection tank is connected to the second bottom outlets of the two composite high-efficiency separators through a pipeline; The low-pressure steam network is connected to the second flushing inlets of the two composite high-efficiency separators, and the flushing pipeline is connected to the desalted water network or the steam condensate network.
4. The coke oven gas comprehensive utilization device according to claim 3, characterized in that: The separation device further comprises: The waste liquid conveying device is installed in the waste liquid collection tank and connected to the biochemical treatment device, and is used to convey the waste liquid in the waste liquid collection tank to the biochemical treatment device.
5. The coke oven gas comprehensive utilization device according to claim 1, characterized in that: The cooling device includes a first heat exchanger and a second heat exchanger arranged in parallel; The first inlet of the first heat exchanger is connected to the second outlet of the second heat exchange device, and the first outlet of the first heat exchanger is connected to the first inlet of the second heat exchanger; the second inlet and the second outlet of the first heat exchanger are both connected to the desalted water network to heat the desalted water; The first outlet of the second heat exchanger is connected to the separation device; the second inlet and the second outlet of the second heat exchanger are connected to the circulating water supply pipe and the circulating water return pipe respectively.
6. The coke oven gas comprehensive utilization device according to claim 1, characterized in that: Also includes: A heater is provided, wherein the outlet of the deoxidation device is connected to the fine desulfurization device through the heater, and the heater is used to heat the deoxidized coke oven gas and transport it to the fine desulfurization device.
7. The coke oven gas comprehensive utilization device according to claim 6, characterized in that: Also includes: A short-circuit pipe, wherein both ends of the short-circuit pipe are respectively connected to the second outlet of the first heat exchange device and the inlet of the cooling device.