Coke oven gas refining system

Abstract

The utility model discloses a coke oven gas refining system, and belongs to the technical field of energy utilization. The coke oven gas refining system comprises a gas heater; the coarse refining device is used for carrying out desulfurization treatment on the coal gas; the fine refining device is used for performing naphthalene removal treatment on the coal gas; wherein the coarse refining device, the fine refining device and the pressurizing machine are sequentially connected to form an output pipeline, and the pressurizing machine, the gas heater and the coarse refining device form a return pipeline.

Description

Technical Field

[0001] The present application belongs to the technical field of energy utilization, and in particular, relates to a refined coke oven gas system. Background Art

[0002] In order to meet the needs of CCPP power generation, steel cutting, cold rolling and coke oven gas pressure swing adsorption hydrogen production, the gas sent out by the coking plant needs to be purified twice. In the existing technology, a coke oven gas refining system is usually used to remove H2S in the coke oven gas while removing tar, naphthalene, NH3, HCN and other impurities at one time to obtain qualified purified gas.

[0003] The coke oven gas refining system consists of a rough refining device for desulfurization and a fine refining device for naphthalene removal. When the adsorbent in the fine refining device is saturated during use, the adsorbent inside the fine refining device is heated by a gas heater to gasify the tar, naphthalene, sulfur and organic matter adsorbed on the adsorbent and then discharged from the bottom of the tower together with the regenerated gas, thereby realizing the reuse of the fine refining device. However, in the prior art, the length of the pipeline from the coking plant to the inlet of the rough refining system is about 1,500 meters and there is no insulation device, resulting in a low inlet gas temperature of the rough refining system. The heater configuration cannot simultaneously meet the needs of regenerating the fine refining device and raising the tower temperature of the rough refining device in winter. Therefore, in extremely cold weather, it is easy for the rough refining tower and the fine refining tower to freeze and block, causing the production line to shut down. Utility Model Content

[0004] The present application aims to at least to some extent solve the technical problem in the prior art that the adsorption tower of the refining system is frozen and blocked during gas purification in an extremely cold environment, causing the production line to shut down. To this end, the present application provides a refined coke oven gas system.

[0005] The embodiment of the present application provides a refined coke oven gas system, the refined coke oven gas system comprising:

[0006] Gas heaters;

[0007] A rough refining device for desulfurizing coal gas;

[0008] A fine refining device for removing naphthalene from coal gas;

[0009] The rough refining device, the fine refining device and the pressurizing machine are sequentially connected to form an output pipeline, and the pressurizing machine, the gas heater and the rough refining device form a return pipeline.

[0010] In some embodiments, the gas heater is in communication with the crude refining device.

[0011] In some embodiments, the gas heater includes a first heater and a second heater, the air inlet end of the first heater and the air inlet end of the second heater are both connected to the reflux port of the compressor, the air outlet end of the first heater is connected to the air inlet end pipeline of the fine refining device, and the air outlet end of the second heater is connected to the air inlet end pipeline of the rough refining device.

[0012] In some embodiments, an air outlet end of the first heater is connected to an air outlet end of the second heater via a connecting pipeline.

[0013] In some embodiments, a first regulating valve is disposed at a connection end between the first heater and the fine refining device, and a second regulating valve is disposed at a connection end between the second heater and the rough refining device.

[0014] In some embodiments, a third regulating valve is provided on the connecting pipeline.

[0015] In some embodiments, the crude refining device is composed of multiple desulfurization towers connected in parallel through connecting pipelines, and the fine refining device is composed of multiple naphthalene removal towers connected in parallel through connecting pipelines, and the crude refining device is connected in series with the fine refining device.

[0016] In some embodiments, the polishing device is in communication with a boiler.

[0017] In some embodiments, the press is a D800 press.

[0018] In some embodiments, the gas heater is in communication with a plurality of sets of the output pipelines.

[0019] The beneficial effects of the present invention include at least:

[0020] The present application provides a refined coke oven gas system, which comprises: a rough refining device for desulfurizing coal gas; a fine refining device for removing naphthalene from coal gas; wherein the rough refining device, the fine refining device and the pressurizer are sequentially connected to form an output pipeline, and the pressurizer, the gas heater and the rough refining device form a reflux pipeline. The pressurizer is used to pressurize the coal gas treated by the fine refining device, so that it can be transported and used. At the same time, the pressurizer is provided with a reflux port, which is connected to the gas heater, and the gas heater is connected to the rough refining device, so that the reflux coal gas heated by the gas heater can be added to the rough refining device, so that the coal gas inside the rough refining device can be heat-conducted to increase the coal gas temperature, and finally the adsorption towers of the rough refining device and the fine refining device will not freeze and block in extremely cold weather, causing the production line to stop, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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. 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 creative work.

[0022] Figure 1 The structural schematic diagram of the refined coke oven gas system is shown;

[0023] Figure 2 A schematic structural diagram of a refined coke oven gas system having multiple groups of output pipelines is shown.

[0024] Figure numerals: 1. rough refining device; 2. fine refining device; 3. gas heater; 4. first heater; 5. second heater; 6. first regulating valve; 7. connecting pipeline; 8. second regulating valve; 9. pressurizer; 10. third regulating valve. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0029] In the related art, there is a technical problem that the adsorption tower of the refining system is blocked by ice when the gas is purified in an extremely cold environment, causing the production line to shut down. The embodiment of the present application provides a refined coke oven gas system, which can at least to some extent solve the technical problem that the adsorption tower of the refining system is blocked by ice when the gas is purified in an extremely cold environment, causing the production line to shut down.

[0030] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0031] See also Figure 1 The embodiment of the present application provides a refined coke oven gas system that can improve the technical problem of the refined coke oven gas system shutdown caused by low temperature. The refined coke oven gas system The embodiment of the present application provides a refined coke oven gas system comprising: a rough refining device 1 for desulfurizing the coal gas; a fine refining device 2 for removing naphthalene from the coal gas; wherein the rough refining device 1, the fine refining device 2 and the compressor 9 are sequentially connected to form an output pipeline, and the compressor 9, the coal gas heater 3 and the rough refining device 1 form a reflux pipeline. The refined coke oven gas system proposed in the embodiment of the present application is used to pressurize the gas treated by the fine refining device 2 through a compressor 9, so that it can be transported for use. At the same time, the compressor 9 is provided with a reflux port, which is connected to the gas heater 3. The reflux gas can be heated by the gas heater 3. The gas heater 3 is connected to the rough refining device 1 and the fine refining device 2, so as to ensure that the gas heater 3 can heat the reflux gas inside the rough refining device 1, thereby avoiding the freezing and blockage of the adsorption tower of the refining system in extremely cold weather and causing the production line to stop, thereby improving industrial efficiency.

[0032] In some embodiments, see Figure 1 The gas heater 3 is connected to the refining device 2 so that the reflux gas heated by the gas heater 3 can flow into the refining device 2, thereby realizing the function of regenerating the naphthalene-removing agent in the refining device 2.

[0033] In some embodiments, see Figure 1The gas heater 3 includes a first heater 4 and a second heater 5. The air inlet end of the first heater 4 and the air inlet end of the second heater 5 are both connected to the reflux port of the compressor 9. The air outlet end of the first heater 4 is connected to the air inlet end pipeline of the fine refining device 2, and the air outlet end of the second heater 5 is connected to the air inlet end pipeline of the rough refining device 1. Through the above structure, the first heater 4 is connected to the air inlet pipeline of the fine refining device 2, thereby realizing the function of regeneration and naphthalene removal, and the second heater 5 is connected to the air inlet pipeline of the rough refining device 1, thereby realizing heating of the inside of the rough refining device 1, which can effectively avoid the production line shutdown caused by ice blockage of the adsorption tower of the entire refining system in extremely cold weather.

[0034] In some embodiments, see Figure 1 The gas outlet end of the first heater 4 is connected to the gas outlet end of the second heater 5 by a connecting pipe 7. The gas outlet end of the first heater 4 is connected to the gas outlet end of the second heater 5 by the connecting pipe 7.

[0035] In some embodiments, see Figure 1 A first regulating valve 6 is provided at the connection end between the first heater 4 and the fine refining device 2, and a second regulating valve 8 is provided at the connection end between the second heater 5 and the rough refining device 1, so as to facilitate the staff to select and switch different heating modes.

[0036] In some embodiments, see Figure 1 A third regulating valve 10 is provided on the connecting pipeline 7, and the third regulating valve 10 can be used to adjust the switching between the individual heating mode and the common heating mode of the first heater 4 and the second heater 5.

[0037] In some embodiments, see Figure 1 The fine refining device 2 is connected to the boiler, which is a 130t boiler. The rough refining device 1 is composed of 11 desulfurization towers connected by connecting pipelines. The desulfurization towers are filled with room temperature high-efficiency desulfurizers, coke and alumina balls to form a mixed bed for desulfurization and detarring. The coke oven gas to be treated enters the desulfurization tower from the bottom of the desulfurization tower and contacts with coke and desulfurizer. The gas first passes through the coke layer, where the tar is intercepted and adsorbed, and the content is reduced to 5mg / Nm 3 ~10mg / Nm 3, and then pass through the normal temperature iron oxide desulfurization bed, hydrogen sulfide undergoes chemical reaction, and the content is reduced to below 20mg / Nm3. The refining device 2 is composed of multiple naphthalene removal towers connected by connecting pipelines. The refining device 2 is composed of 11 adsorption towers, and the towers are filled with high-efficiency adsorbents, mainly composed of activated carbon, coke and other adsorbents to form a composite bed. The adsorbent adsorbs naphthalene, tar, H2S, NH3, HCN and other impurities in the coke oven gas at room temperature. When the adsorption tower reaches adsorption saturation (the preset adsorption time is 20 days), the adsorbent will be regenerated at this time. The regeneration process of the naphthalene removal tower is divided into four steps: heating - constant temperature - cooling - waiting. During regeneration, superheated steam at 170℃~280℃ is used to heat the coke oven gas after D800 is pressurized. The refined coke oven gas heated to 160~180℃ enters from the top of the naphthalene removal tower, the adsorbent is slowly heated, and the regeneration temperature in the tower is maintained at 140~150℃. The tar, naphthalene, sulfur and organic matter adsorbed on the adsorbent are gasified and discharged from the bottom of the tower together with the regenerated gas. The regenerated dirty gas is connected to the 130t boiler for use, and returns to the pipeline network when the 130t boiler is overhauled. After the heating and regeneration of the naphthalene removal tower is completed, the returned refined gas is used to blow and cool to room temperature. The adsorption operation can be put into operation again, and the rough refining device 1 and the fine refining device 2 are connected in series, so that the gas treated by the rough refining device 1 can be treated by the fine refining device 2.

[0038] In some embodiments, the press 9 is a D800 press, which can meet the use requirements of the production line.

[0039] In some embodiments, see Figure 2 The gas heater 3 is connected to a plurality of output pipelines, so that the gas heater 3 can perform the functions of heat preservation, heating and naphthalene removal agent regeneration on the plurality of output pipelines, thereby improving the utilization rate of the gas heater 3.

[0040] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0041] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0042] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A refined coke oven gas system, characterized in that: include: Gas heater (3); A rough refining device (1) for desulfurizing coal gas; A refining device (2) for removing naphthalene from coal gas; The crude refining device (1), the fine refining device (2) and the pressurizing machine (9) are sequentially connected to form an output pipeline, and the pressurizing machine (9), the gas heater (3) and the crude refining device (1) form a return pipeline.

2. A refined coke oven gas system according to claim 1, characterized in that: The coal gas heater (3) is connected to the rough refining device (1).

3. A refined coke oven gas system according to claim 2, characterized in that: The gas heater comprises a first heater (4) and a second heater (5), wherein the air inlet end of the first heater (4) and the air inlet end of the second heater (5) are both connected to the reflux port of the pressurizing machine (9), the air outlet end of the first heater (4) is connected to the air inlet end pipeline of the fine refining device (2), and the air outlet end of the second heater (5) is connected to the air inlet end pipeline of the rough refining device (1).

4. A refined coke oven gas system according to claim 3, characterized in that: The air outlet end of the first heater (4) and the air outlet end of the second heater (5) are connected via a connecting pipeline (7).

5. A refined coke oven gas system according to claim 3, characterized in that: A first regulating valve (6) is provided at a connection end between the first heater (4) and the fine refining device (2), and a second regulating valve (8) is provided at a connection end between the second heater (5) and the rough refining device (1).

6. A refined coke oven gas system according to claim 4, characterized in that: The connecting pipeline (7) is provided with a third regulating valve (10).

7. A refined coke oven gas system according to claim 1, characterized in that: The rough refining device (1) is composed of a plurality of desulfurization towers connected in parallel via a connecting pipeline, and the fine refining device (2) is composed of a plurality of naphthalene removal towers connected in parallel via a connecting pipeline. The rough refining device (1) and the fine refining device (2) are connected in series.

8. A refined coke oven gas system according to claim 7, characterized in that: The refining device (2) is connected to the boiler.

9. A refined coke oven gas system according to any one of claims 1 to 8, characterized in that: The press (9) is a D800 press.

10. A refined coke oven gas system according to claim 9, characterized in that: The gas heater (3) is in communication with a plurality of groups of output pipelines.

Images