Tower top structure for reducing entrainment of gas in desulfurizing tower

Abstract

The utility model relates to a tower top structure for reducing gas entrainment of a desulfurizing tower, which comprises a gas-liquid separation device and a gas outlet pipe, and the gas outlet pipe is fixedly connected to the top of the desulfurizing tower and arranged above a gravity liquid distributor; the gas-liquid separation device is arranged in a variable-diameter space at the top of the desulfurization tower and comprises an outer cylinder, an inner cylinder, a rotational flow guide plate and a liquid discharge pipe, the gas outlet pipe is arranged in the inner cylinder, the outer cylinder is arranged outside the inner cylinder, the bottoms of the inner cylinder and the outer cylinder are of closed structures, the rotational flow guide plate is arranged at the bottom of the outer cylinder, and the liquid discharge pipe is arranged in the rotational flow guide plate. A guide window is formed in the upper part of the inner cylinder; a space is reserved between the bottom end of the gas outlet pipe and the bottom of the inner cylinder; and the bottoms of the outer cylinder and the inner cylinder are connected with liquid discharge pipes. The device has the advantages that the variable-diameter structure space at the top of the desulfurizing tower is fully utilized, secondary cyclone separation of coal gas is realized, the purpose of separating entrained desulfurizing liquid drops from the coal gas is realized, and the entrainment problem of the coal gas is solved.

Description

Technical Field

[0001] The utility model belongs to the field of coal gas desulfurization and purification, and particularly relates to a tower top structure for reducing the entrainment of coal gas mist in a desulfurization tower. Background Art

[0002] In the oxidation desulfurization device for coal gas purification, the coal gas after desulfurization often contains a large amount of desulfurization liquid droplets. These substances will accumulate in the coal gas pipeline, the packing of the subsequent coal gas washing tower, the liquid distributor and the mist collector, and it is very difficult to clean. When accumulated to a certain extent, it will block the packing and the mist collector, affecting the uniform distribution of the liquid and bringing adverse effects to the coal gas purification process. For example, patent CN 215250662U discloses a desulfurization tower, the top of the tower body is provided with a coal gas outlet, and the coal gas inlet extends from the side wall or the top of the tower body into the interior, vertically downward; the tower body is provided with mist catching packing, packing and gas distribution packing from top to bottom.

[0003] At present, the desulfurization tower top packing mist catching layer and labyrinth mist catching device are used to remove the mist and foam entrained in the coal gas, but there are generally problems such as low capture efficiency and difficulty in cleaning. Summary of the invention

[0004] The utility model aims to provide a tower top structure for reducing the entrainment of coal gas mist in a desulfurization tower, fully utilizing the top space of the desulfurization tower, adding a secondary cyclone separation structure above a liquid distributor, realizing gas-liquid separation, so as to solve the problem of coal gas mist entrainment.

[0005] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0006] A tower top structure for reducing the entrainment of gas mist in a desulfurization tower comprises a gas-liquid separation device and a gas outlet pipe, wherein the gas outlet pipe is fixedly connected to the top of the desulfurization tower and is arranged above a gravity liquid distributor; the gas-liquid separation device is arranged in a variable diameter space at the top of the desulfurization tower, the gas-liquid separation device comprises an outer cylinder, an inner cylinder, a swirl guide plate, a drain pipe, and a guide window, the gas outlet pipe is arranged inside the inner cylinder, the outer cylinder is arranged outside the inner cylinder, the bottoms of the inner cylinder and the outer cylinder are both closed structures, the bottom of the outer cylinder is provided with a swirl guide plate, the upper part of the inner cylinder is provided with a guide window, a space is left between the bottom end of the gas outlet pipe and the bottom of the inner cylinder, and the gas can enter the gas outlet pipe through the space; the bottoms of the outer cylinder and the inner cylinder are both connected with drain pipes.

[0007] It also includes a washer, which is fixed on the top of the desulfurization tower and is arranged between the outer cylinder and the inner cylinder, and between the inner cylinder and the gas outlet pipe.

[0008] A liquid sealing pipe is arranged at the bottom of the liquid discharge pipe.

[0009] The guide window is a rectangular opening on the upper part of the inner cylinder, and guide plates are fixed on both sides of the rectangular opening, and one guide plate is arranged tangentially along the inner cylinder.

[0010] The swirl guide plate is composed of two upper and lower spiral plates, and the two spiral plates form a spiral channel between the inner cylinder and the outer cylinder.

[0011] The gas outlet pipe, the inner cylinder and the outer cylinder are coaxially arranged.

[0012] The inner cylinder and the top of the outer cylinder are fixedly connected to the top of the desulfurization tower.

[0013] The bottom of the outer cylinder is higher than the bottom of the inner cylinder.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model makes full use of the variable diameter structure space at the top of the desulfurization tower and is integrated with the tower top. The overall structure is compact, and the secondary cyclone separation of coal gas is realized, so as to separate the desulfurization liquid droplets entrained from the coal gas and solve the problem of mist entrainment of the coal gas.

[0016] The utility model forms two gas channels between the gas outlet pipe and the inner cylinder, and between the inner cylinder and the outer cylinder by setting the inner and outer cylinders, thereby extending the journey of the gas from the gravity liquid distributor to the desulfurization tower. The inlets of the two gas channels are both provided with guiding windows and swirl guide plates, so that the gas can swirl along the cylinder wall, and the liquid droplets entrained in the gas can settle along the cylinder wall and the outer wall of the gas outlet pipe, thereby improving the efficiency of separating the liquid droplets. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Figure 2 It is a schematic diagram of the positional relationship among the gas outlet pipe, the inner cylinder and the outer cylinder.

[0019] Figure 3 yes Figure 2 Section view along line AA.

[0020] Figure 4 It is a structural schematic diagram of the guide window.

[0021] In the figure: 1-gas outlet pipe 2-outer cylinder 3-inner cylinder 4-swirl guide plate 5-drain pipe 6-guide window 7-cleaner 8-gravity liquid distributor 9-liquid seal pipe 41-guide plate 1 42-guide plate 2 61-guide plate 1 62-guide plate 2. DETAILED DESCRIPTION

[0022] The present invention is described in detail below in conjunction with the accompanying drawings of the specification, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0023] See Figure 1 , Figure 2 A tower top structure for reducing the entrainment of gas mist in a desulfurization tower. A gravity liquid distributor 8 is used for feeding at the top of the desulfurization tower, and the variable diameter space at the top of the desulfurization tower is fully utilized to set a secondary cyclone separation to realize a gas-liquid separation device. The tower top structure includes a gas-liquid separation device and a gas outlet pipe 1. The gas outlet pipe 1 is fixedly connected to the top of the desulfurization tower and is arranged above the gravity liquid distributor 8. The gas-liquid separation device is arranged in the variable diameter space at the top of the desulfurization tower. The gas-liquid separation device includes an outer cylinder 2, an inner cylinder 3, a swirl guide plate 4, a liquid discharge pipe 5, and a guide window 6. The inner cylinder 3 and the top of the outer cylinder 2 are fixedly connected to the top of the desulfurization tower. The gas outlet pipe 1 is arranged inside the inner cylinder 3, and the outer cylinder 2 is arranged outside the inner cylinder 3. The bottoms of the inner cylinder 3 and the outer cylinder 2 are all closed structures. The gas outlet pipe 1, the inner cylinder 3, and the outer cylinder 2 are coaxially arranged. A swirl guide plate 4 is arranged at the bottom of the outer cylinder 2. The gas enters the annular channel between the outer cylinder 2 and the inner cylinder 3 through the swirl guide plate 4, and rotates from bottom to top. A guide window 6 is opened at the top of the inner cylinder 3. There is a space between the bottom end of the gas outlet pipe 1 and the bottom of the inner cylinder 3, and the gas can enter the gas outlet pipe 1 through the space; the gas enters the channel between the gas outlet pipe 1 and the inner cylinder 3 through the guide window 6, and rotates from top to bottom, and then enters the gas outlet pipe 1 from the bottom of the gas outlet pipe 1 and is discharged to the outside of the desulfurization tower. The bottoms of the outer cylinder 2 and the inner cylinder 3 are connected to a drain pipe 5 for discharging the collected droplets to the outside of the cylinder.

[0024] The tower top structure for reducing the entrainment of gas mist in the desulfurization tower also includes a cleaner 7, which is fixed on the top of the desulfurization tower and arranged between the outer cylinder 2 and the inner cylinder 3, and between the inner cylinder 3 and the gas outlet pipe 1, and is used for regular cleaning of the inside of the outer cylinder 2 and the inner cylinder 3 to avoid the aggregation of separated viscous substances.

[0025] A liquid seal pipe 9 is provided at the bottom of the liquid discharge pipe 5. Since the liquid discharge is discontinuous, the liquid seal pipe 9 can prevent the gas from entering the liquid discharge pipe 5. Liquid distributors can be divided into gravity type and pressure type according to the liquid discharge mode, see "Modern Packed Tower Technology Guide" edited by Wang Shuying, China Petrochemical Press, 1998. The use of gravity liquid distributor 8 makes it difficult for the discharged liquid to be entrained by the gas.

[0026] See Figure 1 , Figure 4The guide window 6 is a rectangular opening at the upper part of the inner cylinder 3, and a guide plate 1 61 and a guide plate 2 62 are fixed on both sides of the rectangular opening. The guide plate 1 61 is arranged tangentially along the inner cylinder 3, and the guide plate 2 62 and the guide plate 1 61 are arranged parallel to each other. The coal gas enters the channel between the inner cylinder 3 and the coal gas outlet pipe along the guide plates 1 61 and 2 62, and the coal gas flows along the inner wall of the inner cylinder 3 and swirls downward, and the coal gas separation droplets settle along the inner wall of the inner cylinder 3.

[0027] See Figure 2 , Figure 3 The swirl guide plate 4 is composed of two upper and lower spiral plates, and the two spiral plates form a spiral channel between the inner cylinder 3 and the outer cylinder 2. Under the action of the guide plate, the gas enters the outer cylinder 2 in an oblique upward manner, and flows along the inner wall of the outer cylinder 2 and swirls upward. The angle between the guide plate 1 41 and the horizontal plane is smaller than the angle between the guide plate 2 42 and the horizontal plane, so that the gas can enter the channel at a faster speed.

[0028] See Figure 1-Figure 4 The desulfurized coal gas in the desulfurization tower carries a small amount of liquid droplets. Under the action of the swirl guide plate 4, the coal gas rotates from bottom to top and enters the annular channel between the outer cylinder 2 and the inner cylinder 3, completing the first-level cyclone separation of liquid droplets. The separated liquid droplets settle along the inner wall of the outer cylinder 2, gather at the bottom of the annular channel, and are finally discharged into the desulfurization tower through multiple drainage pipes 5; the coal gas enters the annular channel between the coal gas outlet pipe 1 and the inner cylinder 3 tangentially through the guide window 6 at the top of the inner cylinder, and rotates from top to bottom to complete the second-level cyclone separation of liquid droplets. The separated liquid droplets settle along the inner wall of the inner cylinder 3, gather at the bottom of the inner cylinder, and are finally discharged into the desulfurization tower through multiple drainage pipes 5. The coal gas without liquid droplets is sent out from the top of the coal gas outlet pipe 1.

[0029] The utility model makes full use of the variable diameter structure space at the top of the desulfurization tower and is integrated with the tower top. The overall structure is compact, and the secondary cyclone separation of coal gas is realized, so as to separate the desulfurization liquid droplets entrained from the coal gas and solve the problem of mist entrainment of the coal gas.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can replace or change the technical solution and the utility model concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A tower top structure for reducing the entrainment of gas mist in a desulfurization tower, characterized in that: It includes a gas-liquid separation device and a gas outlet pipe. The gas outlet pipe is fixedly connected to the top of the desulfurization tower and is arranged above the gravity liquid distributor. The gas-liquid separation device is arranged in the variable diameter space at the top of the desulfurization tower. The gas-liquid separation device includes an outer cylinder, an inner cylinder, a swirl guide plate, a drain pipe, and a guide window. The gas outlet pipe is arranged inside the inner cylinder, and the outer cylinder is arranged outside the inner cylinder. The bottoms of the inner cylinder and the outer cylinder are both closed structures. A swirl guide plate is arranged at the bottom of the outer cylinder, and a guide window is opened on the upper part of the inner cylinder. A space is left between the bottom end of the gas outlet pipe and the bottom of the inner cylinder, and the gas can enter the gas outlet pipe through the space. The bottoms of the outer cylinder and the inner cylinder are both connected with drain pipes.

2. A tower top structure for reducing entrainment of coal gas mist in a desulfurization tower according to claim 1, characterized in that: It also includes a washer, which is fixed on the top of the desulfurization tower and is arranged between the outer cylinder and the inner cylinder, and between the inner cylinder and the gas outlet pipe.

3. A tower top structure for reducing entrainment of gas mist in a desulfurization tower according to claim 1, characterized in that: A liquid sealing pipe is arranged at the bottom of the liquid discharge pipe.

4. A tower top structure for reducing entrainment of coal gas mist in a desulfurization tower according to claim 1, characterized in that: The guide window is a rectangular opening on the upper part of the inner cylinder, and guide plates are fixed on both sides of the rectangular opening, and one guide plate is arranged tangentially along the inner cylinder.

5. The tower top structure for reducing the entrainment of gas mist in a desulfurization tower according to claim 1, characterized in that: The swirl guide plate is composed of two upper and lower spiral plates, and the two spiral plates form a spiral channel between the inner cylinder and the outer cylinder.

6. A tower top structure for reducing entrainment of coal gas mist in a desulfurization tower according to claim 1, characterized in that: The gas outlet pipe, the inner cylinder and the outer cylinder are coaxially arranged.

7. The tower top structure for reducing the entrainment of gas mist in a desulfurization tower according to claim 1, characterized in that: The inner cylinder and the top of the outer cylinder are fixedly connected to the top of the desulfurization tower.

8. The tower top structure for reducing the entrainment of gas mist in a desulfurization tower according to claim 1, characterized in that: The bottom of the outer cylinder is higher than the bottom of the inner cylinder.

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