Low-resistance high-efficiency wet-type desulfurization tower

Abstract

The utility model aims at the field of waste gas treatment and provides a low-resistance high-efficiency wet-type desulfurization tower which comprises a tower body, an air inlet, a liquid outlet, a chimney and a desulfurization device, the air inlets are symmetrically formed in two sides of the end part of the tower body; a liquid outlet is formed in the bottom end of the tower body; the upper end of the tower body is fixedly connected with a chimney; and a desulfurization device is arranged in the tower body. The gas flow uniform distribution device is arranged at the bottom of the desulfurization tower to cut, rectify and guide sulfur-containing flue gas, so that the sulfur-containing flue gas uniformly enters the middle of the desulfurization tower to be subjected to gas-liquid contact exchange desulfurization, and the problem of contradiction between overlarge resistance of desulfurization equipment and uniform gas flow distribution can be solved; the target of efficient desulfurization on the premise of low resistance, low flue gas operation energy consumption and low circulating slurry pump energy consumption is achieved; and meanwhile, the operation efficiency can be improved, the production cost is reduced, and good popularization value and practical value are achieved.

Description

Technical Field

[0001] The utility model relates to a low-resistance and high-efficiency wet desulfurization tower, belonging to the field of waste gas treatment. Background Art

[0002] In the production process of metal smelting enterprises, various physical or chemical reactions cause different concentrations of sulfur dioxide in the flue gas, which leads to the widespread presence of sulfur dioxide in the flue gas, especially in the flue gas of power plant boilers, coke oven flue gas and blast furnace flue gas in steel plants, electrolytic cell flue gas in electrolytic aluminum plants, petroleum coke calcination flue gas, and carbon product roasting flue gas. The common characteristics of these flue gases are large flue gas volume or high sulfur dioxide concentration. At this time, a desulfurization tower is needed to desulfurize the waste gas. The Chinese utility model patent with patent number CN202011424528.3 discloses a ship exhaust gas desulfurization washing tower and an exhaust gas desulfurization method, in which the washing liquid nozzle closest to the inner wall of the exhaust gas desulfurization washing tower is installed obliquely toward the center of the exhaust gas desulfurization washing tower, and the remaining washing liquid nozzles are vertically installed at the lower part of the nozzle bracket, so that the washing liquid is not easy to directly contact the inner wall of the exhaust gas desulfurization washing tower, thereby reducing the wear and tear of the washing liquid on the inner wall of the washing tower and greatly increasing the service life of the washing tower; the Chinese utility model patent with patent number CN202110376984.3 discloses a sludge sintered ceramic pellet exhaust gas semi-dry desulfurization and dust removal method, which can not only meet the emission requirements, but also simplify the process route, reduce primary investment and operating costs, reduce floor space, and greatly reduce the generation of wastewater and wet smoke plumes.

[0003] However, the inventor of the utility model patent discovered that the prior art has the following problems: in previous flue gas purification systems, some desulfurization towers have added a flow-blocking layer structure in order to control the airflow distribution in the equipment. Holes are opened in corrosion-resistant metal materials to form a porous plate structure, which is laid flat in the lower part of the equipment to form upper and lower partitions of the equipment. The airflow passes through the small holes to force the airflow to be evenly distributed. The porous structure orifice plate has an opening area of ​​about 1 / 3 of the entire flow area, which causes a sharp increase in equipment resistance and forms a large upper and lower pressure difference of the orifice plate. The characteristic of this type of equipment is that the equipment has a large flue gas resistance during operation, often reaching 1300-1500Pa, resulting in high energy consumption of the flue gas system. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a low-resistance and high-efficiency wet desulfurization tower, which solves the contradiction between excessive resistance of desulfurization equipment and uniform airflow distribution, and achieves the goal of high-efficiency desulfurization under the premise of low resistance, low flue gas operation energy consumption, and low circulating slurry pump energy consumption.

[0005] The utility model is realized through the following technical solutions.

[0006] The utility model provides a low-resistance and high-efficiency wet desulfurization tower, comprising a tower body, an air inlet, a liquid discharge port, a chimney and a desulfurization device; the air inlet is symmetrically arranged on both sides of the tower body end; a liquid discharge port is provided at the bottom of the tower body; a chimney is fixedly connected to the upper end of the tower body; a desulfurization device is provided inside the tower body; the desulfurization device comprises a spray gun and a first nozzle; the spray gun is fixedly connected to the middle part of the tower body cavity at equal intervals in the longitudinal direction; the first nozzle is fixedly connected to the spray gun at equal intervals in the transverse direction; both ends of the spray gun extend through the tower body shell, and a maintenance platform fixed to the outer wall of the tower body is provided below the passing part.

[0007] The first nozzles on the same layer of spray guns are staggered.

[0008] The first nozzle is a solid nozzle, and the nozzle droplet size is controlled within a diameter of 2 mm.

[0009] The desulfurization device also includes a demister and a cleaning pipe; the demisters are fixed in a longitudinal array at the upper part of the inner cavity of the tower body; cleaning pipes are fixed above the demisters; both ends of the cleaning pipes extend through the tower body shell, and a maintenance platform fixed to the outer wall of the tower body is provided below the passing part.

[0010] The second nozzles are fixed on the cleaning pipe at equal intervals.

[0011] The desulfurization device also includes an airflow distribution device; the airflow distribution device is fixed at the end of the inner cavity of the tower body; and both ends of the airflow distribution device are connected to the air inlet.

[0012] The airflow uniform distribution device is composed of a large plate-like structure, and is distributed in a ladder shape as a whole.

[0013] The internal guide plate of the airflow distribution device forms an angle of 45° with the airflow cut.

[0014] The beneficial effects of the utility model are as follows: by arranging an air flow uniform distribution device at the bottom of the desulfurization tower to cut, rectify and guide the sulfur-containing flue gas, so that it can evenly enter the middle of the desulfurization tower for gas-liquid contact exchange desulfurization, it can solve the contradiction between the excessive resistance of the desulfurization equipment and the uniform air flow distribution, and achieve the goal of efficient desulfurization under the premise of low resistance, low flue gas operation energy consumption, and low circulating slurry pump energy consumption; at the same time, it can also improve operating efficiency, reduce production costs, and has good promotion value and practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] In the figure: 1-tower body, 2-air flow distribution device, 3-air inlet, 4-liquid discharge port, 5-spray gun, 6-first nozzle, 7-demister, 8-cleaning pipe, 9-second nozzle, 10-chimney, 11-maintenance platform, 12-desulfurization device. DETAILED DESCRIPTION

[0017] The technical solution of the utility model is further described below, but the scope of protection required is not limited to the description.

[0018] The utility model relates to Figure 1 A low-resistance and high-efficiency wet desulfurization tower shown includes a tower body 1, an air inlet 3, a liquid discharge port 4, a chimney 10 and a desulfurization device 12; the air inlet 3 is symmetrically arranged on both sides of the end of the tower body 1; the bottom of the tower body 1 is provided with a liquid discharge port 4; the upper end of the tower body 1 is fixedly connected with a chimney 10; and the desulfurization device 12 is arranged inside the tower body 1. The tower body 1 provides the structural frame and force support of the device; the air inlet 3 is a channel for sulfur-containing gas to enter the tower body 1; the liquid discharge port 4 is used to discharge the desulfurization slurry; the chimney 10 is used to discharge the flue gas after desulfurization; and the desulfurization device 12 is the main device for treating sulfur-containing flue gas.

[0019] The second embodiment of the utility model is basically the same as the first embodiment, mainly in that the desulfurization device is optimized. The desulfurization device 12 includes a spray gun 5 and a first nozzle 6; the spray gun 5 is fixed at equal intervals in the longitudinal direction in the middle of the inner cavity of the tower body 1; the first nozzle 6 is fixedly connected to the spray gun 5 at equal intervals in the transverse direction. The spray gun 5 is used to pump circulating water for use; the first nozzle 6 is used to spray the circulating water out.

[0020] The first nozzles 6 on the spray guns 5 on the same layer are staggeredly distributed to achieve uniform coverage on the projection surface, ensuring that the sulfur-containing flue gas and the clean circulating water are fully contacted and exchanged with each other, thereby achieving desulfurization.

[0021] The first nozzle 6 is a solid nozzle, and the nozzle droplet size is controlled within a diameter of 2 mm, which can achieve controllable droplet specific surface area.

[0022] The desulfurization device 12 further includes a demister 7 and a cleaning pipe 8; the demisters 7 are fixed in a longitudinal array at the upper part of the inner cavity of the tower body 1; the cleaning pipes 8 are fixed above the demisters 7. The demisters 7 are used to separate the desulfurized flue gas from the desulfurized slurry; the cleaning pipes 8 are used to pump the circulating water for further use.

[0023] Second nozzles 9 are fixed on the cleaning pipe 8 at equal intervals, and the second nozzles 9 spray out circulating water again for further desulfurization gas-liquid contact.

[0024] The desulfurization device 12 also includes an airflow distribution device 2, which is fixed at the inner end of the tower body 1, and both ends of the airflow distribution device 2 are connected to the air inlet 3. The airflow distribution device 2 is used to cut, rectify and guide the sulfur-containing flue gas entering from the air inlet 3.

[0025] The airflow distribution device 2 is composed of a large plate-like structure and is distributed in a ladder shape as a whole; it can convert the concentrated airflow coming from the air inlet 3 into a dispersed airflow.

[0026] The internal guide plate of the airflow distribution device 2 forms an angle of 45° with the airflow cutting, which can cut the large vortex formed by the airflow into small vortices and guide the small vortices of the airflow so that they evenly enter the middle of the desulfurization tower 1 for gas-liquid contact exchange desulfurization.

[0027] Both ends of the spray gun 5 and the cleaning pipe 8 extend through the shell of the tower body 1, and a maintenance platform 11 fixed to the outer wall of the tower body 1 is provided below the passing part. The spray gun 5 can be taken out from the maintenance platform 11 outside the desulfurization tower 1 for maintenance, realizing complete maintenance outside the tower, which is simple, convenient and fast.

[0028] Based on this, a typical working mode of the utility model is:

[0029] like Figure 1 As shown, when the utility model is implemented, the sulfur-containing flue gas enters the desulfurization tower 1 through the air inlet 3, passes through the airflow distribution device 2 at the bottom of the desulfurization tower 1, and the airflow distribution device 2 cuts, rectifies, and guides the flue gas, so that the original inlet concentrated airflow becomes a dispersed airflow, and the large vortex formed by the original airflow is cut into small vortices, and the small vortices of the airflow are guided to evenly enter the spray gun 5 and the first nozzle 6 in the middle of the desulfurization tower 1 for gas-liquid contact exchange desulfurization. After washing and desulfurization, the flue gas rises to the upper part of the desulfurization tower 1, and the flue gas carrying the desulfurization slurry passes through the demister 7 to achieve gas-liquid separation, and the desulfurization slurry returns to the bottom of the desulfurization tower 1. The flue gas after desulfurization treatment is discharged from the chimney 10 at the top of the desulfurization tower 1. The slurry after desulfurization treatment is discharged through the bottom drain port 4. The slurry after treatment such as dosing, aeration, sedimentation, dehydration, etc. is transported to the upper part of the desulfurization tower 1 through a circulation pump outside the desulfurization tower, and is sprayed into the flue gas through the spray gun 5 and the first nozzle 6 for desulfurization and purification treatment again.

Claims

1. A low resistance and high efficiency wet desulfurization tower, characterized by: The tower body (1) comprises a tower body (1), an air inlet (3), a liquid discharge outlet (4), a chimney (10) and a desulfurization device (12); the air inlet (3) is symmetrically arranged on both sides of the end of the tower body (1); the bottom of the tower body (1) is provided with a liquid discharge outlet (4); the top of the tower body (1) is fixedly connected to the chimney (10); the tower body (1) is provided with a desulfurization device (12); the desulfurization device (12) comprises a spray gun (5) and a first nozzle (6); the spray gun (5) is fixedly connected to the middle of the inner cavity of the tower body (1) at equal intervals in the longitudinal direction; the first nozzle (6) is fixedly connected to the spray gun (5) at equal intervals in the transverse direction; both ends of the spray gun (5) extend through the shell of the tower body (1), and a maintenance platform (11) fixed to the outer wall of the tower body (1) is provided below the through portion.

2. The low-resistance and high-efficiency wet desulfurization tower according to claim 1, characterized in that: The first nozzles (6) on the spray guns (5) on the same layer are staggered.

3. The low-resistance and high-efficiency wet desulfurization tower according to claim 2, characterized in that: The first nozzle (6) is a solid nozzle, and the nozzle droplet size is controlled within a diameter of 2 mm.

4. The low-resistance and high-efficiency wet desulfurization tower according to claim 1, characterized in that: The desulfurization device (12) further comprises a demister (7) and a cleaning pipe (8); the demisters (7) are fixed in a longitudinal array at the upper part of the inner cavity of the tower body (1); a cleaning pipe (8) is fixed above each of the demisters (7); both ends of the cleaning pipe (8) extend through the shell of the tower body (1), and a maintenance platform (11) fixed to the outer wall of the tower body (1) is provided below the passing portion.

5. The low-resistance and high-efficiency wet desulfurization tower according to claim 4, characterized in that: Second nozzles (9) are fixed on the cleaning pipe (8) at equal intervals.

6. The low-resistance and high-efficiency wet desulfurization tower according to claim 1, characterized in that: The desulfurization device (12) further comprises an airflow distribution device (2); the airflow distribution device (2) is fixed at the end of the inner cavity of the tower body (1); and both ends of the airflow distribution device (2) are connected to the air inlet (3).

7. The low-resistance and high-efficiency wet desulfurization tower according to claim 6, characterized in that: The airflow uniform distribution device (2) is composed of a large plate-like structure, and is distributed in a ladder shape as a whole.

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