Coke oven gas utilization system

Abstract

The utility model belongs to the technical field of coal gas utilization, and particularly relates to a coke oven gas utilization system which comprises a membrane separation device, and a coal gas pipeline, a hydrogen-rich gas pipeline and a methane-rich gas pipeline are connected to the membrane separation device; the coke oven production device is connected with the methane-rich gas pipeline, and a coal gas backflow pipeline is arranged between the coke oven production device and the dry desulfurization machine; and the synthetic ammonia production device is connected with the hydrogen-rich gas pipeline. Coal gas enters the membrane separation device from the coal gas pipeline, hydrogen in the coal gas is separated out by the membrane separation device, so that the hydrogen enters the hydrogen-rich gas pipeline, and methane gas is used for replacing part of the coal gas to be combusted in the coke oven production device, so that part of the coal gas in the coke oven production device is replaced out; and the gas passes through the reflux pipeline and then enters the dry desulfurization machine, so that the inlet gas amount of the membrane separation device is increased, and the waste of the gas is reduced.

Description

Technical Field

[0001] This application belongs to the technical field of gas utilization, and particularly relates to a coke oven gas utilization system. Background Art

[0002] In the production of synthetic ammonia from coke oven gas, after the chemical products are recovered from the coke oven gas and the gas is purified by dry desulfurization, through a high-efficiency membrane separation device, the permeated hydrogen-rich gas is pressurized and then made into liquid ammonia; the methane-rich gas that is not permeated after membrane separation goes to a gas generator for power generation, efficiently utilizing the coke oven gas. However, when the gas generator is under maintenance or operating at low load, it will cause the emission of coke oven gas, resulting in waste of coke oven gas. Summary of the Invention

[0003] The embodiment of this application provides a coke oven gas utilization system, which can increase the inlet gas volume of the membrane separation device and reduce gas waste.

[0004] A coke oven gas utilization system includes:

[0005] A membrane separation device, which is connected with a gas pipeline, a hydrogen-rich gas pipeline and a methane-rich gas pipeline. The gas pipeline is used to connect to a dry desulfurizer, and the membrane separation device is used to separate hydrogen from the gas.

[0006] A coke oven production device, which is connected with the methane-rich gas pipeline, and there is a gas return pipeline between the coke oven production device and the dry desulfurizer.

[0007] A synthetic ammonia production device, which is connected with the hydrogen-rich gas pipeline.

[0008] According to another embodiment of the present utility model, the coke oven gas utilization system further includes a gas power generation device, which is connected with the methane-rich gas pipeline.

[0009] According to another embodiment of the present utility model, a branch pipeline is connected to the methane-rich gas pipeline, and the branch pipeline is connected with the gas power generation device.

[0010] According to another embodiment of the present utility model, a control valve is provided on the methane-rich gas pipeline.

[0011] According to another embodiment of the present utility model, the control valve is a PIC-903001 pressure reducing valve group.

[0012] The coke oven gas utilization system according to the embodiment of the present utility model has at least the following beneficial effects: The gas purified by the dry desulfurizer enters the membrane separation device from the gas pipeline. The membrane separation device separates the hydrogen in the gas, so that the hydrogen enters the hydrogen-rich gas pipeline, and the methane gas in the gas enters the methane-rich gas pipeline. Then the methane gas is sent to the coke oven production device, and part of the gas in the coke oven production device is replaced by burning methane gas in the coke oven production device. The hydrogen in the hydrogen-rich gas pipeline will enter the synthetic ammonia production device to synthesize liquid ammonia. Among them, part of the gas replaced in the coke oven production device returns to the dry desulfurizer through the reflux pipeline, thereby increasing the inlet gas volume of the membrane separation device and reducing gas waste. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of the coke oven gas utilization system provided by an embodiment of the present application. Detailed Embodiments

[0014] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present application.

[0015] The embodiments of the present application will be further described in detail below in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0016] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0017] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified or limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. 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 specific situations.

[0018] In the embodiments of the present application, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0019] In the production of synthetic ammonia from coke oven gas, after the chemical products are recovered from the coke oven gas and the gas is purified by dry desulfurization, through a high-efficiency membrane separation device, the permeated hydrogen-rich gas is pressurized to produce liquid ammonia; the methane-rich gas that is not permeated after membrane separation is sent to a gas generator for power generation, making efficient use of the coke oven gas. However, when the gas generator is under maintenance or operating at low load, the coke oven gas will be discharged, resulting in waste of the coke oven gas.

[0020] See Figure 1 , the present application provides a coke oven gas utilization system, including a membrane separation device 2, a coke oven production device 7 and a synthetic ammonia production device 8. A gas pipeline 1, a hydrogen-rich gas pipeline 3 and a methane-rich gas pipeline 4 are connected to the membrane separation device 2. The gas pipeline 1 is used to connect to a dry desulfurizer. The membrane separation device 2 is used to separate hydrogen from the gas. The coke oven production device 7 is connected to the methane-rich gas pipeline 4. A gas return pipeline is provided between the coke oven production device 7 and the dry desulfurizer. The synthetic ammonia production device 8 is connected to the hydrogen-rich gas pipeline 3.

[0021] The purified coal gas from the dry desulfurizer enters the membrane separation device 2 through the coal gas pipeline 1. The membrane separation device 2 separates the hydrogen in the coal gas, allowing the hydrogen to enter the hydrogen-rich gas pipeline 3, and the methane gas in the coal gas enters the methane-rich gas pipeline 4. The methane gas is sent to the coke oven production device 7, and part of the coal gas in the coke oven production device 7 is replaced by burning methane gas in the coke oven production device 7. The hydrogen in the hydrogen-rich gas pipeline 3 enters the synthetic ammonia production device 8 to synthesize liquid ammonia. Part of the coal gas displaced from the coke oven production device 7 returns to the dry desulfurizer through the return pipeline, thereby increasing the inlet coal gas volume of the membrane separation device 2 and reducing the waste of coal gas.

[0022] In addition, the system can also increase the output of liquid ammonia and optimize the regulation ratio of liquid ammonia to electricity.

[0023] In addition, valves are installed at both ends of the membrane separation device 2 to control the on-off of the connection between the membrane separation device 2 and the hydrogen-rich gas pipeline 3 and the on-off of the connection between the membrane separation device 2 and the methane-rich gas pipeline 4.

[0024] In the coke oven gas utilization system of some embodiments, a gas power generation device 6 is further included, and the gas power generation device 6 is connected to the methane-rich gas pipeline 4. Methane gas enters the gas power generation device 6 through the methane-rich gas pipeline 4 for power generation.

[0025] In some embodiments, a control valve 5 is provided on the methane-rich gas pipeline 4. The intake gas volume to the coke oven production device 7 is controlled by the control valve 5.

[0026] Further, the control valve 5 is a PIC-903001 pressure reducing valve group. The adjustment logic of the PIC-903001 pressure reducing valve group is as follows: when methane-rich gas is needed for heating the coke oven production device 7, under the adjustment of the PIC-903001 pressure reducing valve group, a certain amount of methane-rich gas is introduced into the coke oven production device 7, and the valve opening of the PIC-903001 pressure reducing valve group is adjusted to ensure the smooth introduction and pressure stability of the coke oven production device 7.

[0027] In some other embodiments, a branch pipeline is connected to the methane-rich gas pipeline 4, and the branch pipeline is connected to the gas power generation device 6.

[0028] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the embodiments of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

Claims

1. A coke oven gas utilization system, characterized in that, Comprising: A membrane separation device, a coal gas pipeline, a hydrogen-rich gas pipeline and a methane-rich gas pipeline are connected to the membrane separation device. The coal gas pipeline is used to connect to a dry desulfurizer, and the membrane separation device is used to separate hydrogen from the coal gas; A coke oven production device, the coke oven production device is connected to the methane-rich gas pipeline, and a coal gas reflux pipeline is provided between the coke oven production device and the dry desulfurizer; A synthetic ammonia production device, the synthetic ammonia production device is connected to the hydrogen-rich gas pipeline.

2. The coke oven gas utilization system according to claim 1, wherein It further includes a gas power generation device, and the gas power generation device is connected to the methane-rich gas pipeline.

3. The coke oven gas utilization system according to claim 2, wherein A branch pipeline is connected to the methane-rich gas pipeline, and the branch pipeline is connected to the gas power generation device.

4. The coke oven gas utilization system according to claim 2, wherein, A control valve is provided on the methane-rich gas pipeline.

5. The coke oven gas utilization system according to claim 4, characterized in that, The control valve is a PIC-903001 pressure reducing valve group.

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