Gas purification and recovery equipment in methanation process of coke oven gas

Abstract

The utility model belongs to the technical field of coke oven gas production, and particularly relates to gas purification and recovery equipment in a coke oven gas methanation process, which comprises a heat exchange mechanism, a gas inlet pipe, a gas outlet pipe and a gas outlet pipe, the water receiving mechanism is mounted under the heat exchange mechanism; the filtering mechanism is arranged on one side of the heat exchange mechanism, the heat exchange mechanism is communicated with the water receiving mechanism and the filtering mechanism through a three-way connecting pipe, and the heat exchange mechanism is in contact with cooling water in the heat exchange mechanism through a plurality of distributed fine heat exchange pipes; the contact area between tail gas and cooling water can be increased, so that the heat exchange efficiency is improved, condensate water generated when water vapor in the tail gas is cooled through the heat exchange mechanism can be received and treated through the water receiving mechanism, and the situation that the condensate water is accumulated in a pipeline and influences subsequent tail gas treatment is avoided; and the heat in the tail gas is utilized to the maximum extent.

Description

Technical Field

[0001] The utility model relates to the technical field of coke oven gas production, in particular to a gas purification and recovery device in the coke oven gas methanation process. Background Art

[0002] Coke oven gas, also known as coke oven gas, is a high calorific value gas due to its high combustible components. It is raw gas or waste gas. It refers to the coal used for coking made from several kinds of bituminous coal. During the methanation process of coke oven gas, the high-temperature exhaust gas generated in the production process is directly discharged through the pipeline. The large amount of heat carried in the exhaust gas is not effectively utilized, resulting in economic losses.

[0003] For example, the document with the prior art publication number CN215712784U provides a coke oven gas production reactor capable of waste heat recovery, the device includes a base, the upper end of the base is fixedly connected to a main furnace and an auxiliary furnace, the right end of the main furnace and the left end of the auxiliary furnace are respectively fixedly connected to a first heat exchange box and a second heat exchange box, the interiors of the first heat exchange box and the second heat exchange box are both fixedly connected to heat exchange pipes, the upper and lower ends of the first heat exchange box are respectively fixedly connected to a first gas pipe and a second gas pipe connected to the heat exchange pipes, and the other end of the first gas pipe is connected to the inner cavity of the main furnace. The device can recycle and reuse the energy in the tail gas during the coking production process, avoiding the problem that the tail gas energy cannot be reused.

[0004] Although the device has many beneficial effects, it still has the following problems: the contact area between the heat exchange tube and the heat exchange box in the device is low, resulting in low heat exchange efficiency, and the tail gas contains a small amount of water. After the tail gas is cooled by heat exchange, the water vapor will liquefy into liquid water, and the condensed liquid water cannot be processed. In view of this, we propose a gas purification and recovery device in the coke oven gas methanation process. Utility Model Content

[0005] In order to make up for the shortcomings of the prior art, the contact area between the heat exchange tube and the heat exchange box is low, which leads to low heat exchange efficiency. After the water vapor contained in the exhaust gas is liquefied into liquid water, the condensed liquid water cannot be treated. The utility model proposes a gas purification and recovery equipment in the methanation process of coke oven gas.

[0006] The technical solution adopted by the utility model to solve its technical problems is: the gas purification and recovery equipment in the coke oven gas methanation process described in the utility model includes: a heat exchange mechanism, the upper end of which is connected to the exhaust gas discharge pipe; a water receiving mechanism, which is installed directly below the heat exchange mechanism; a filtering mechanism, which is arranged on one side of the heat exchange mechanism, and the heat exchange mechanism, the water receiving mechanism and the filtering mechanism are connected by a three-way connecting pipe.

[0007] Preferably, the heat exchange mechanism includes a heat exchange box, a plurality of groups of heat exchange tubes are evenly arranged inside the heat exchange box, a gas collecting plate 1 is arranged at the top of the heat exchange tube, a gas collecting plate 2 is connected to the lower end of the heat exchange tube, and the gas collecting plate 1 is connected to the exhaust pipe.

[0008] Preferably, a water inlet pipe is connected to the outer wall of the heat exchange box away from the exhaust gas emission pipe, and a water outlet pipe is connected to the outer wall of the heat exchange box close to the exhaust gas emission pipe.

[0009] Preferably, the water receiving mechanism includes a water receiving box, a drain pipe is connected to the lower end of the water receiving box, a control valve is installed on the drain pipe, a water level sensor is installed on the lower outer side of the water receiving box, a controller is provided on the outer wall of the water receiving box, and the controller is electrically connected to the control valve and the water level sensor through wires.

[0010] Preferably, the filtering mechanism includes a filter box, a filter plate for dust filtering is installed inside the filter box, a maintenance port is provided at the upper end of the filter box, an end cover 1 connected by a threaded engagement is provided at the outer end of the maintenance port, a dust exhaust port is provided at the lower end of the filter box, and an end cover 2 connected by a threaded engagement is provided at the outer side of the dust exhaust port.

[0011] Preferably, the gas collecting plate 2, the water receiving box and the filter box are connected to each other via a three-way connecting pipe, and the filter box is arranged slightly above the water receiving box.

[0012] The utility model is beneficial in that:

[0013] 1. After the exhaust gas discharged from the exhaust pipe enters the heat exchange mechanism, the utility model will flow through multiple heat exchange tubes, and contact the cooling water in the heat exchange mechanism through multiple distributed small heat exchange tubes, which can increase the contact area between the exhaust gas and the cooling water, thereby improving the heat exchange efficiency, and the condensed water generated by the water vapor in the exhaust gas after cooling by the heat exchange mechanism can be received and processed by the water receiving mechanism, so as to avoid the accumulation of condensed water in the pipeline and affect the subsequent exhaust gas treatment;

[0014] 2. The utility model provides a maintenance port and a dust exhaust port on the filter box of the filter mechanism, which can facilitate the cleaning of dust attached to the filter plate after the equipment filters the dust on the exhaust gas, thereby increasing the service life of the filter plate and improving the convenience of maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a half-sectioned enlarged structural schematic diagram of the heat exchange mechanism of the utility model;

[0018] Figure 3 It is a half-sectioned enlarged structural schematic diagram of the water receiving mechanism of the utility model;

[0019] Figure 4 It is a half-sectioned enlarged structural schematic diagram of the filtering mechanism of the utility model.

[0020] In the figure: 1. heat exchange mechanism; 2. exhaust emission pipe; 3. water connection mechanism; 4. filtering mechanism; 5. three-way connecting pipe; 101. heat exchange box; 102. heat exchange pipe; 103. gas collecting plate one; 104. gas collecting plate two; 105. water inlet pipe; 106. water outlet pipe; 301. water connection box; 302. water discharge pipe; 303. control valve; 304. water level sensor; 305. controller; 401. filter box; 402. filter plate; 403. maintenance port; 404. end cover one; 405. dust exhaust port; 406. end cover two. DETAILED DESCRIPTION

[0021] 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 in 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.

[0022] See also Figure 1 As shown, a gas purification and recovery device in the methanation process of coke oven gas comprises: a heat exchange mechanism 1, the upper end of which is connected to a tail gas discharge pipe 2; a water receiving mechanism 3, which is installed directly below the heat exchange mechanism 1; a filter mechanism 4, which is arranged on one side of the heat exchange mechanism 1, and the heat exchange mechanism 1, the water receiving mechanism 3 and the filter mechanism 4 are connected to each other through a three-way connecting pipe 5;

[0023] During the coke oven gas methanation production process, the exhaust gas generated is discharged into the heat exchange mechanism 1 through the exhaust gas discharge pipe 2, flows in the heat exchange mechanism 1 and exchanges heat with cooling water, so as to achieve the recovery and reuse of the heat contained in the exhaust gas. After the exhaust gas is cooled, the water vapor contained therein will condense into liquid water and flow downward into the water receiving mechanism 3, and the cooled exhaust gas is discharged to the filtering mechanism 4 through the three-way connecting pipe 5 for dust filtering, and then discharged to the next procedure for processing after the filtering is completed.

[0024] like Figure 2 As shown, the heat exchange mechanism 1 includes a heat exchange box 101, and multiple groups of heat exchange tubes 102 are evenly arranged inside the heat exchange box 101. The top of the heat exchange tube 102 is provided with a gas collecting plate 103, and the lower end of the heat exchange tube 102 is connected to a gas collecting plate 2 104, and the gas collecting plate 103 is connected to the exhaust pipe 2;

[0025] When the exhaust gas is discharged into the heat exchange mechanism 1 through the exhaust gas discharge pipe 2, it is first discharged into the gas collecting plate 103, and then distributed into each heat exchange tube 102 through the gas collecting plate 103 to flow. When flowing in the heat exchange tube 102, it exchanges heat with the cooling water in the heat exchange box 101, and then the exhaust gas in each heat exchange tube 102 is concentrated on the gas collecting plate 2 104 to facilitate flowing into the water receiving mechanism 3.

[0026] The outer wall of the heat exchange box 101 is connected to a water inlet pipe 105 away from the exhaust gas discharge pipe 2, and the outer wall of the heat exchange box 101 is connected to a water outlet pipe 106 near the exhaust gas discharge pipe 2;

[0027] The heat exchange box 101 described above performs water inlet and outlet through the water inlet pipe 105 and the water outlet pipe 106, which can make the heat exchange efficiency of the exhaust gas higher and can fully transfer the heat in the exhaust gas to the cooling water for reuse.

[0028] like Figure 3 As shown, the water receiving mechanism 3 includes a water receiving box 301, a water discharge pipe 302 is connected to the lower end of the water receiving box 301, a control valve 303 is installed on the water discharge pipe 302, a water level sensor 304 is installed at the lower outer side of the water receiving box 301, and a controller 305 is arranged on the outer wall of the water receiving box 301, and the controller 305 is electrically connected to the control valve 303 and the water level sensor 304 through wires;

[0029] The water receiving mechanism 3 is placed directly below the heat exchange mechanism 1 to facilitate the direct inflow of condensed liquid water to avoid accumulation in the pipeline. After the water flows into the water receiving box 301, the control valve 303 can be controlled to open at a timed interval by the controller 305, thereby opening the passage of the water discharge pipe 302, so that water can be discharged at a timed interval through the water discharge pipe 302. The water level in the water receiving box 301 can be detected by the water level sensor 304. When the water level reaches the water level sensor 304, the signal is transmitted to the controller 305 to control the control valve 303 to close, so that the water receiving box 301 can always maintain a certain water level to avoid exhaust gas from being discharged from the water discharge pipe 302. The water level sensor 304 can be an RS485 sensor of the brand Xifanyi.

[0030] like Figure 4 As shown, the filter mechanism 4 includes a filter box 401, a filter plate 402 for dust filtering is installed inside the filter box 401, a maintenance port 403 is provided at the upper end of the filter box 401, an end cap 1 404 connected by threaded engagement is provided at the outer end of the maintenance port 403, a dust discharge port 405 is provided at the lower end of the filter box 401, and an end cap 2 406 connected by threaded engagement is provided at the outer side of the dust discharge port 405;

[0031] When the exhaust gas is discharged into the filter box 401 through the filtering mechanism 4, the dust in the exhaust gas is filtered by the filter plate 402. During the process, the dust will adhere to the filter plate 402. In order to extend the service life of the filter plate 402, regular cleaning and maintenance are required. The interior can be cleaned through the maintenance port 403 by unscrewing the end cover 1 404 to expose the maintenance port 403, and the cleaned dust can be cleaned out by unscrewing the end cover 2 406 to expose the dust exhaust port 405.

[0032] The gas collecting plate 2 104, the water receiving box 301 and the filter box 401 are connected to each other through a three-way connecting pipe 5, and the filter box 401 is arranged above the water receiving box 301;

[0033] The connection through the three-way connecting pipe 5 facilitates the flow of exhaust gas, and allows the condensed water to automatically flow into the water receiving box 301 for collection by gravity. The filter box 401 is set at a relatively high position to avoid the inflow of condensed water.

[0034] Working principle: During the methanation production process of coke oven gas, the exhaust gas generated is discharged into the heat exchange mechanism 1 through the exhaust gas discharge pipe 2, flows in the heat exchange mechanism 1 and exchanges heat with cooling water, so as to achieve the recovery and reuse of the heat contained in the exhaust gas. After the exhaust gas is cooled, the water vapor contained therein will condense into liquid water and flow downward into the water receiving mechanism 3, and the cooled exhaust gas is discharged to the filtering mechanism 4 through the three-way connecting pipe 5 for dust filtering, and then discharged to the next procedure for processing after the filtering is completed.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", 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 utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A gas purification and recovery device in the process of coke oven gas methanation, characterized in that: include: A heat exchange mechanism (1), wherein the upper end of the heat exchange mechanism (1) is connected to an exhaust gas discharge pipe (2); A water receiving mechanism (3), wherein the water receiving mechanism (3) is installed directly below the heat exchange mechanism (1); A filtering mechanism (4), wherein the filtering mechanism (4) is arranged on one side of the heat exchange mechanism (1), and the heat exchange mechanism (1) and the water receiving mechanism (3) and the filtering mechanism (4) are connected via a three-way connecting pipe (5).

2. The gas purification and recovery equipment in the coke oven gas methanation process according to claim 1, characterized in that: The heat exchange mechanism (1) comprises a heat exchange box (101), a plurality of groups of heat exchange tubes (102) are evenly arranged inside the heat exchange box (101), a gas collecting plate 1 (103) is arranged at the top end of the heat exchange tube (102), a gas collecting plate 2 (104) is connected to the lower end of the heat exchange tube (102), and the gas collecting plate 1 (103) is connected to the exhaust gas discharge pipe (2).

3. The gas purification and recovery equipment in the coke oven gas methanation process according to claim 2, characterized in that: The outer wall of the heat exchange box (101) is connected to a water inlet pipe (105) at a position away from the exhaust gas discharge pipe (2), and the outer wall of the heat exchange box (101) is connected to a water outlet pipe (106) at a position close to the exhaust gas discharge pipe (2).

4. The gas purification and recovery equipment in the coke oven gas methanation process according to claim 3, characterized in that: The water receiving mechanism (3) comprises a water receiving box (301), the lower end of the water receiving box (301) is connected to a water discharge pipe (302), a control valve (303) is installed on the water discharge pipe (302), a water level sensor (304) is installed at the lower part of the outer side of the water receiving box (301), and a controller (305) is arranged on the outer wall of the water receiving box (301), and the controller (305) is electrically connected to the control valve (303) and the water level sensor (304) through wires.

5. The gas purification and recovery equipment in the coke oven gas methanation process according to claim 4, characterized in that: The filtering mechanism (4) comprises a filtering box (401), a filtering plate (402) for dust filtering is installed inside the filtering box (401), a maintenance port (403) is provided at the upper end of the filtering box (401), an end cap (404) connected by a threaded engagement is provided at the outer end of the maintenance port (403), a dust discharge port (405) is provided at the lower end of the filtering box (401), and an end cap (406) connected by a threaded engagement is provided at the outer side of the dust discharge port (405).

6. The gas purification and recovery equipment in the coke oven gas methanation process according to claim 5, characterized in that: The gas collecting plate 2 (104), the water receiving box (301) and the filter box (401) form a communication structure through a three-way connecting pipe (5), and the filter box (401) is arranged slightly above the water receiving box (301).

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