Desulfurized coal gas cooling system

Abstract

The utility model relates to the technical field of coal gas treatment, in particular to a desulfurized coal gas cooling system which comprises a post-sulfurization separation tower, a post-sulfurization cleaning tower, an electrostatic decoking tower, a lithium bromide cooler and a post-tower separator, the post-sulfur separation tower is communicated with the post-sulfur cleaning tower; one side of the electrostatic decoking tower is communicated with the sulfur post-cleaning tower, and the other side of the electrostatic decoking tower is communicated with the lithium bromide cooler; and the post-tower separator is communicated with the lithium bromide cooler. Generally, coal gas is independently cooled by a cooling tower after being desulfurized, but secondary salts such as sulfuric acid, organic pollutants, particulate matters and the like are mixed after the coal gas is desulfurized, and the impurities can influence the quality of coal gas products, reduce the heat transfer efficiency and influence the subsequent cooling process. Compared with the prior art, the device is provided with the post-sulfur separation tower, the post-sulfur cleaning tower, the electrostatic decoking tower, the lithium bromide cooler, the post-tower separator and the like, so that some impurities in the coal gas can be removed before being cooled, and the phenomenon that some impurities influence the quality of the coal gas or interfere with the cooling effect of the coal gas is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of coal gas processing, in particular to a post-desulfurization coal gas cooling system. Background Art

[0002] Coal gas desulfurization is a crucial step in the gas purification process, primarily removing hydrogen sulfide from the gas. Hydrogen sulfide converts to sulfur dioxide during gas combustion. Excessive sulfur dioxide levels in the air can cause localized acid rain, endangering the human environment. Sulfur dioxide also significantly impacts the quality of products in industries such as ceramics and kaolin. The temperature of desulfurized coal gas is typically still high. Direct subsequent processing or utilization can cause thermal stress damage to equipment and pipelines, impacting system stability and service life. Therefore, cooling is necessary to reduce the temperature.

[0003] Generally, after desulfurization, the coal gas is cooled in a cooling tower alone. However, after desulfurization, the coal gas is still mixed with some by-products of the desulfurization process, such as sulfuric acid and other secondary salts, organic pollutants, particulate matter and other impurities. These impurities will not only affect the product quality of the coal gas, but also reduce the heat transfer efficiency and affect the subsequent cooling process. Utility Model Content

[0004] In view of the technical problems of the prior art, the utility model provides a desulfurized coal gas cooling system.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A post-desulfurization coal gas cooling system comprises: a post-sulfur separation tower, a post-sulfur cleaning tower, an electrostatic decoking tower, a lithium bromide cooler, and a post-tower separator; the post-sulfur separation tower is connected to the post-sulfur cleaning tower; one side of the electrostatic decoking tower is connected to the post-sulfur cleaning tower, and the other side is connected to the lithium bromide cooler; the post-tower separator is connected to the lithium bromide cooler.

[0007] Furthermore, it also includes: a water seal device; the water seal device is arranged between the electrostatic decoking tower and the lithium bromide cooler.

[0008] Furthermore, it also includes: a connecting pipe; the connecting pipe includes: a connecting pipe, an air inlet pipe, and an air outlet pipe; the air inlet pipe is arranged on one side of the lithium bromide cooler, and the air outlet pipe is arranged on the other side of the lithium bromide cooler; one end of the connecting pipe is connected to the electrostatic decoking tower, and the other end is connected to the separator after the tower; the air inlet pipe is connected to the connecting pipe; and the air outlet pipe is connected to the connecting pipe.

[0009] Furthermore, an air inlet valve is provided on the air inlet pipe; an air outlet valve is provided on the air outlet pipe; a connecting valve is provided on the connecting pipe; and the connecting valve corresponds to the air inlet pipe and the air outlet pipe.

[0010] Furthermore, the post-sulfur cleaning tower includes: a tower body, a feed structure, a liquid inlet pipe, and a liquid inlet structure; the feed structure is arranged in the tower body; the feed structure is connected to the post-sulfur separation tower; the liquid inlet structure is arranged in the tower body; the liquid inlet structure is arranged on the side of the feed structure away from the ground; and the liquid inlet pipe is connected to the liquid inlet structure.

[0011] Furthermore, the feed structure includes: a cylinder and a debris discharge port; the cylinder is hollow inside; a through hole is opened on the side of the cylinder close to the liquid inlet structure; and the debris discharge port is opened on the side of the cylinder away from the through hole.

[0012] Furthermore, the liquid inlet structure includes: a liquid inlet pipe and a spray head; the spray head is arranged on a side of the liquid inlet pipe close to the feed structure.

[0013] The beneficial effect of the utility model is that the coal gas is processed by a series of equipment before being cooled, so that the coal gas can be removed by some equipment before being cooled, thereby preventing some impurities such as desulfurization by-products in the coal gas from affecting the gas quality or interfering with the cooling effect of the coal gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 : A schematic structural diagram of the utility model;

[0015] Figure 2 : Schematic diagram of part of the structure of the utility model;

[0016] Figure 3 : Schematic diagram of the structure of the post-sulfur cleaning tower.

[0017] In the figure: 1. Post-sulfur separation tower; 2. Post-sulfur cleaning tower; 21. Tower body; 22. Feed structure; 221. Cylinder; 222. Impurity discharge port; 23. Liquid inlet pipe; 24. Liquid inlet structure; 241. Liquid inlet pipe; 242. Sprinkler head; 3. Electrostatic decoking tower; 4. Lithium bromide cooler; 5. Post-tower separator; 6. Water seal device; 7. Connecting pipe; 71. Connecting pipe; 711. Connecting valve; 72. Air inlet pipe; 721. Air inlet valve; 73. Air outlet pipe; 731. Air outlet valve. DETAILED DESCRIPTION

[0018] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0019] according to Figure 1-3 The utility model provides a post-desulfurization coal gas cooling system, comprising: a post-sulfur separation tower 1, a post-sulfur cleaning tower 2, an electrostatic decoking tower 3, a lithium bromide cooler 4, a post-tower separator 5, a water seal device 6, and a connecting pipe 7.

[0020] The post-sulfur separation tower 1 is connected to the post-sulfur cleaning tower 2. The electrostatic decoking tower 3 is connected to the post-sulfur cleaning tower 2 on one side and to the lithium bromide cooler 4 on the other side. The post-tower separator 5 is connected to the lithium bromide cooler 4.

[0021] After desulfurization, the coal gas enters post-sulfur separation tower 1, where impurities such as solid particles, liquid droplets, and bubbles are initially separated from the gas through physical methods (such as sedimentation and centrifugation). The gas is then transported to post-sulfur cleaning tower 2, where cleaning fluid or water is sprayed onto the gas in reverse order to remove residual sulfides, tiny droplets, and other impurities. The gas then enters electrostatic decoking tower 3, where a small amount of tar, dust, and other particles are removed through electrostatic action. The gas is then cooled in lithium bromide cooler 4 and then transferred to post-tower separator 5, where it is used to separate any water present in the gas. This water is partially derived from the post-sulfur cleaning tower 2 and lithium bromide cooler 4. Passing through post-tower separator 5 completes the post-desulfurization cooling process. This cooling process includes some pre-implantation removal to prevent impurities from reducing the cooling effect. Water separation is also performed after cooling, which, combined with the previous impurity removal, improves the gas product quality.

[0022] The water seal device 6 is located between the electrostatic decoking tower 3 and the lithium bromide cooler 4. The connecting pipe 7 comprises a connecting pipe 71, an air inlet pipe 72, and an air outlet pipe 73. The air inlet pipe 72 is located on one side of the lithium bromide cooler 4, while the air outlet pipe 73 is located on the other side of the lithium bromide cooler 4. One end of the connecting pipe 71 is connected to the electrostatic decoking tower 3, and the other end is connected to the post-tower separator 5. The air inlet pipe 72 is connected to the connecting pipe 71. The air outlet pipe 73 is connected to the connecting pipe 71. The air inlet valve 721 is located on the air inlet pipe 72. The air outlet valve 731 is located on the air outlet pipe 73. The connecting valve 711 is located on the connecting pipe 71. The connecting valve 711 corresponds to the air inlet pipe 72 and the air outlet pipe 73, i.e., it is located between the connection points of the air inlet pipe 72 and the connecting pipe 71, and the connection points of the air outlet pipe 73 and the connecting pipe 71.

[0023] The electrostatic decoking tower 3 removes impurities such as tar from the coal gas to a certain extent, but there may still be tiny particles that leave the electrostatic decoking tower 3 along with the coal gas. The utility model is provided with a water seal device 6 between the electrostatic decoking tower 3 and the lithium bromide cooler 4, mainly to facilitate the maintenance of a single device and isolate it from the system. After passing through the electrostatic decoking tower 3, the coal gas will enter the connecting pipe 71, then enter the lithium bromide cooler 4 through the air inlet pipe 72, and then enter the connecting pipe 71 through the air outlet pipe 73, and be sent to the post-tower separator 5. In the actual production process, when the coal gas passes through the post-sulfur separation tower 1, the post-sulfur cleaning tower 2, and the post-sulfur cleaning tower 2, its temperature will change due to the influence of these equipment. It may have reached the required temperature when it is about to reach the lithium bromide cooler 4, and can be directly passed into the post-tower separator 5. At this time, if it enters the lithium bromide cooler 4 first, it will be wasted. Unnecessary cooling resources are used. The utility model is provided with several valves. When encountering the above situation, the air inlet valve 721 and the air outlet valve 731 can be closed, and the connecting valve 711 can be opened to allow the coal gas to enter the connecting pipe 71 after passing through the electrostatic decoking tower 3, and not enter the lithium bromide cooler 4, but directly enter the post-tower separator 5. If the lithium bromide cooler 4 is required for cooling, the connecting valve 711 can be closed and the air inlet valve 721 and the air outlet valve 731 can be opened. That is, it can be adjusted according to actual conditions to suit different processing needs.

[0024] The post-sulfur cleaning tower 2 includes: a tower body 21, a feed structure 22, a liquid inlet pipe 23, and a liquid inlet structure 24. The feed structure 22 is arranged in the tower body 21. The feed structure 22 is connected to the post-sulfur separation tower 1. The liquid inlet structure 24 is arranged in the tower body 21. The liquid inlet structure 24 is arranged on the side of the feed structure 22 away from the ground. The liquid inlet pipe 23 is connected to the liquid inlet structure 24. The feed structure 22 includes: a cylinder 221 and an impurity discharge port 222. The cylinder 221 is hollow inside. A through hole is provided on the side of the cylinder 221 close to the liquid inlet structure 24. The impurity discharge port 222 is provided on the side of the cylinder 221 away from the through hole. The liquid inlet structure 24 includes: a liquid inlet pipe 241 and a spray head 242. The spray head 242 is provided on the side of the liquid inlet pipe 241 close to the feed structure 22.

[0025] After the coal gas passes through the post-sulfur separation tower 1 and enters the post-sulfur cleaning tower 2, it first enters the cylinder 221 of the feed structure 22. After the coal gas enters the cylinder 221, its density is smaller than that of air, so it is discharged from the through hole of the cylinder 221 and rises to the coal gas outlet of the post-sulfur cleaning tower 2. The coal gas may still contain some impurities such as small droplets with higher density that have not been completely removed, which are discharged from the discharge port 222 for separation. At the same time, cleaning liquid (or clean water) is introduced into the liquid inlet pipe 23, so that the cleaning liquid enters the liquid inlet structure 24 and flows to the spray head 242 to spray toward the feed structure 22. During the rising process of the coal gas, it will contact the cleaning liquid, so that some impurities such as sulfides and tiny droplets are driven and separated, and fall to the bottom of the tower from the discharge port 22 and are discharged. Through the above structure, the coal gas and the cleaning liquid are convected, so that the cleaning effect is better.

[0026] The working principle and use process of this utility model:

[0027] When the present invention is in use, first open the air inlet valve 721 and the air outlet valve 731, close the connecting valve 711, and then pass the desulfurized coal gas into the post-sulfur separation tower 1, and then enter the post-sulfur cleaning tower 2 from the feeding structure 22. At the same time, the cleaning liquid is introduced from the liquid inlet pipe 23, so that the cleaning liquid enters the liquid inlet structure 24 and is sprayed from the spray head 242. The coal gas rises from the through hole of the cylinder 221, contacts the cleaning liquid, and continues to rise toward the coal gas outlet of the post-sulfur cleaning tower 2, and then enters the electrostatic decoking tower 3. After passing through the electrostatic decoking tower 3, it passes through the water seal device 6, and then enters the connecting pipe 71, and enters the lithium bromide cooler 4 through the air inlet pipe 72. After leaving the lithium bromide cooler 4, the coal gas enters the post-tower separator 5 through the air outlet pipe 73, and then the cooled coal gas can be obtained.

[0028] In summary, the utility model is equipped with a post-sulfur separation tower, a post-sulfur cleaning tower, an electrostatic decoking tower, a lithium bromide cooler, a post-tower separator and other structures, so that the coal gas can be removed from the gas through some equipment before cooling, thereby avoiding impurities such as some post-desulfurization by-products in the coal gas affecting the gas quality or interfering with the cooling effect of the coal gas.

[0029] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A desulfurized coal gas cooling system, characterized by: include: Post-sulfur separation tower (1), post-sulfur cleaning tower (2), electrostatic decoking tower (3), lithium bromide cooler (4), post-tower separator (5); The post-sulfur separation tower (1) is connected to the post-sulfur cleaning tower (2); One side of the electrostatic decoking tower (3) is connected to the post-sulfur cleaning tower (2), and the other side is connected to the lithium bromide cooler (4); The post-tower separator (5) is connected to the lithium bromide cooler (4).

2. A desulfurized coal gas cooling system according to claim 1, characterized in that: It also includes: a water sealing device (6); The water seal device (6) is arranged between the electrostatic decoking tower (3) and the lithium bromide cooler (4).

3. A desulfurized coal gas cooling system according to claim 1, characterized in that: It also includes: a connecting pipe (7); The connecting pipe (7) comprises: a connecting pipe (71), an air inlet pipe (72), and an air outlet pipe (73); The air inlet pipe (72) is arranged on one side of the lithium bromide cooler (4), and the air outlet pipe (73) is arranged on the other side of the lithium bromide cooler (4); One end of the connecting pipe (71) is connected to the electrostatic decoking tower (3), and the other end is connected to the post-tower separator (5); The air inlet pipe (72) is connected to the connecting pipe (71); The air outlet pipe (73) is connected to the connecting pipe (71).

4. A desulfurized coal gas cooling system according to claim 3, characterized in that: The air intake pipe (72) is provided with an air intake valve (721); The outlet pipe (73) is provided with an outlet valve (731); The connecting pipe (71) is provided with a connecting valve (711); The connecting valve (711) corresponds to the air inlet pipe (72) and the air outlet pipe (73).

5. The desulfurized coal gas cooling system according to claim 1, characterized in that: The post-sulfur cleaning tower (2) comprises: a tower body (21), a feed structure (22), a liquid inlet pipe (23), and a liquid inlet structure (24); The feed structure (22) is arranged in the tower body (21); The feed structure (22) is in communication with the post-sulfur separation tower (1); The liquid inlet structure (24) is arranged in the tower body (21); The liquid inlet structure (24) is arranged on a side of the feed structure (22) away from the ground; The liquid inlet pipe (23) is communicated with the liquid inlet structure (24).

6. A desulfurized coal gas cooling system according to claim 5, characterized in that: The feeding structure (22) comprises: a cylinder (221) and a debris discharge port (222); The cylinder (221) is hollow inside; The cylinder (221) is provided with a through hole on one side close to the liquid inlet structure (24); The impurity discharge port (222) is provided on a side of the cylinder (221) away from the through hole.

7. A desulfurized coal gas cooling system according to claim 5, characterized in that: The liquid inlet structure (24) comprises: a liquid inlet pipe (241) and a spray head (242); The spray head (242) is arranged on a side of the liquid inlet pipe (241) close to the feed structure (22).

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