Hydrogen chloride tail gas absorption device

Abstract

The utility model discloses a hydrogen chloride tail gas absorption device which comprises a box body, an alkali liquor feeding pipe is arranged on the side face of the upper end of the box body, a hydrogen chloride tail gas feeding pipe is arranged on the side face of the lower end of the box body, a stirring device is installed at the upper end of the interior of the box body, and a plurality of liquid baffles are fixedly arranged at the lower end of the interior of the box body. According to the utility model, the liquid baffle is obliquely arranged, so that sediments generated by reaction can automatically roll to the bottom of the box body along the inclined plane, and the sediments are prevented from being gathered on the surface of the liquid baffle; meanwhile, a sediment discharge port, a net cylinder, a discharge pipe and a valve are additionally arranged, so that the sediment is conveniently discharged; besides, an alkali liquor circulating mechanism and a flushing pipe are also arranged, so that the alkali liquor is uniformly distributed, and residues on the surface of the liquid baffle plate are conveniently cleaned, so that the hydrogen chloride absorption efficiency is ensured, the sediment cleaning difficulty is remarkably reduced, and the convenience and economy of equipment maintenance are improved.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen chloride tail gas treatment technology, specifically a hydrogen chloride tail gas absorption device. Background Technology

[0002] In the field of hydrogen chloride tail gas treatment, the hydrogen chloride gas in the tail gas is generally absorbed by neutralizing it with alkaline solutions such as NaOH solution or Ca(OH)2 solution. However, for low-concentration hydrogen chloride tail gas treatment in municipal sewage treatment plants, small laboratories, and other scenarios with limited budgets and low requirements for by-product treatment, Ca(OH)2 solution is preferred because the price of Ca(OH)2 (quicklime) is only 1 / 5 to 1 / 10 of that of NaOH, making it suitable for low-cost treatment needs. In addition, Ca(OH)2 solution has weak corrosiveness and low equipment maintenance costs.

[0003] A search revealed a Chinese utility model patent with application number 202420710143.0, which discloses a hydrogen chloride tail gas absorption device. The device involves conveying alkaline solution from the feed pipe into the tank, and then, by activating an air pump, conveying waste gas from the inlet pipe through the outlet pipe into the alkaline solution within the tank. A reciprocating assembly drives a stirring assembly to move back and forth. The rack and pinion mechanism, in conjunction with gears, causes the stirring assembly to rotate, thus facilitating simultaneous reciprocating movement and stirring of the alkaline solution and waste gas. A liquid-blocking assembly and a liquid-blocking rod extend the mixing time between the waste gas and the alkaline solution, ensuring thorough mixing and facilitating the removal of hydrogen chloride from the waste gas.

[0004] Regarding the aforementioned prior art, although the arrangement of the first and second baffles can prolong the residence time of hydrogen chloride gas inside the chamber, the horizontal arrangement and multiple layers of the first and second baffles cause Ca(OH)2 solution to combine with hydrogen chloride gas and produce precipitates when using Ca(OH)2 solution as an alkaline solution, which are difficult to clean out inside the chamber.

[0005] In view of this, the present invention proposes a hydrogen chloride tail gas absorption device to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a hydrogen chloride tail gas absorption device to solve the problems in the background technology.

[0007] This utility model provides the following technical solution: a hydrogen chloride tail gas absorption device, including a box body, an alkaline feed pipe provided on the upper side of the box body, and a hydrogen chloride tail gas feed pipe provided on the lower side of the box body. A stirring device is installed on the upper part of the inside of the box body, and several baffles are fixed on the lower part of the inside of the box body. The baffles are inclined inside the box body, and the end of the baffle connected to the box body is higher than the other end of the baffle connected to the box body.

[0008] The lower end of the box is provided with a sediment discharge port, a screen is fixed to the sediment discharge port, a discharge pipe is fixed to the lower end of the screen, a valve is fixed to the lower end of the discharge pipe, a cylinder is fixed to the outside of the screen, and an alkali circulation mechanism is connected between the cylinder and the upper inside of the box. The alkali circulation mechanism is used to draw excess alkali from the cylinder to the upper inside of the box.

[0009] The upper end of the box is connected to a rinsing pipe for rinsing the surface of the baffle liquid.

[0010] In summary, compared with existing technologies, the advantages of this utility model are as follows: By tilting the baffle plate, the precipitate generated by the reaction can automatically roll down the slope to the bottom of the tank, preventing the precipitate from accumulating on the surface of the baffle plate; at the same time, the addition of a precipitate discharge port, a screen cylinder, a discharge pipe, and a valve enables convenient discharge of the precipitate; in addition, it is equipped with an alkali circulation mechanism and a flushing pipe to ensure uniform distribution of alkali and facilitate the cleaning of residues on the surface of the baffle plate. Thus, while ensuring the absorption efficiency of hydrogen chloride, it significantly reduces the difficulty of cleaning the precipitate and improves the convenience and economy of equipment maintenance. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0012] Figure 2 This is a frontal cross-sectional view of the present invention.

[0013] Figure 3 This is a schematic diagram of the flushing pipe structure of this utility model. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-3This utility model discloses a hydrogen chloride tail gas absorption device, comprising a housing 3. An alkaline solution inlet pipe 10 is provided on the upper side of the housing 3, and a hydrogen chloride tail gas inlet pipe 4 is provided on the lower side of the housing 3. A stirring device is installed at the upper part of the interior of the housing 3, and several baffles 15 are fixedly installed at the lower part of the interior of the housing 3. In use, hydrogen chloride tail gas is fed into the interior of the housing 3 through the hydrogen chloride tail gas inlet pipe 4, and a Ca(OH)2 solution is fed into the interior of the housing 3 through the alkaline solution inlet pipe 10. After entering the housing 3, the hydrogen chloride tail gas reacts with the Ca(OH)2 solution to generate calcium chloride and water, thereby preventing the hydrogen chloride gas from being directly released into the air and causing pollution. The stirring device ensures that the hydrogen chloride gas and alkaline solution are mixed evenly, and the baffles 15 prolong the residence time of the hydrogen chloride gas inside the housing 3. This is prior art; for reference, a hydrogen chloride tail gas absorption device disclosed in Chinese Utility Model Patent Application No. 202420710143.0 can be consulted.

[0016] The main innovation of this utility model is as follows:

[0017] The baffle plate 15 is inclined inside the tank 3, and the end of the baffle plate 15 connected to the tank 3 is higher than the other end of the baffle plate 15 connected to the tank 3. By setting the baffle plate 15 inclined, the precipitate generated during the reaction can automatically roll down the inclined surface of the baffle plate 15 to the lower end of the tank 3, thereby avoiding the problem of precipitate accumulating on the surface of the baffle plate 15.

[0018] The lower end of the tank 3 is provided with a precipitate discharge port, and a screen cylinder 16 is fixed to the precipitate discharge port. A discharge pipe 7 is fixed to the lower end of the screen cylinder 16, and a valve 8 is fixed to the lower end of the discharge pipe 7. The precipitate generated by the reaction, such as calcium chloride, will enter the screen cylinder 16 through the precipitate discharge port, and then enter the discharge pipe 7 through the lower end of the screen cylinder 16. The precipitate can be discharged from the tank 3 by opening the valve 8. A cylinder 9 is fixed to the outside of the screen cylinder 16 of the tank 3. An alkali circulation mechanism is connected between the cylinder 9 and the upper end of the tank 3. The alkali circulation mechanism is used to draw excess alkali from the cylinder 9 to the upper end of the tank 3, so that the alkali circulates in the tank 3. Through this circulation, the alkali is more evenly distributed inside the tank 3.

[0019] Furthermore, to facilitate the cleaning of the deposits on the surface of the baffle plate 15, a flushing pipe 16 for rinsing the surface of the baffle plate 15 is connected to the upper end of the housing 3. After the absorption of hydrogen chloride tail gas is completed, the valve 8 can be opened to flush water into the interior of the housing 3 through the flushing pipe 16, and the deposits on the surface of the baffle plate 15 will be washed clean by the water flow.

[0020] An exhaust port 2 is fixedly provided at the upper end of the housing 3. The alkaline solution circulation mechanism includes a liquid extraction pipe 5 connected between the cylinder 9 and the upper end of the housing 3. A water pump 6 is installed on the liquid extraction pipe 5, and a nozzle 11 is fixedly provided at the upper end of the housing 3. The nozzle 11 is located at the bottom of the exhaust port 2. When in use, the external power supply of the water pump 6 is turned on, and the water pump 6 draws the alkaline solution filtered by the mesh cylinder 16 in the cylinder 9. The alkaline solution flows into the nozzle 11 through the liquid extraction pipe 5 and is sprayed onto the upper end of the housing 3 through the nozzle 11. In this way, the unabsorbed hydrogen chloride tail gas can come into further contact with the alkaline solution sprayed by the nozzle 11, ensuring the absorption effect.

[0021] Valve 8 is a butterfly valve.

[0022] The stirring device includes a motor 1 fixed to the upper end of the box 3. The output shaft of the motor 1 is fixed with a stirring rod, and the side of the stirring rod is fixed with a stirring blade 12. By connecting the external power supply of the motor 1, the stirring rod and the stirring blade 12 are driven to rotate, which can stir the alkaline solution in the box 3 and make the alkaline solution more evenly distributed.

[0023] It is worth mentioning that the flushing pipe 16 has a horizontal pipe 13 fixed inside the tank 3. The horizontal pipe 13 has outlet holes 14 fixed at equal intervals along its length. The horizontal pipe 13 is positioned above the top baffle plate 15 and at the higher end of the top baffle plate 15. The water sprayed through the outlet holes 14 forms a waterfall-like structure on the inner wall of the tank 3, so that the water sprayed through the outlet holes 15 can fully contact the surface of the baffle plate 15 and wash away the sediment.

[0024] In summary, this utility model aims to solve the problem of difficult precipitate removal in existing hydrogen chloride tail gas absorption devices when using Ca(OH)2 solution by optimizing the structure of the baffle plate 15, adding a precipitate cleaning device and an alkaline solution circulation system. Under the premise of ensuring the tail gas treatment effect, it reduces equipment maintenance costs and improves the applicability of low-concentration hydrogen chloride tail gas treatment scenarios.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydrogen chloride tail gas absorption device, comprising a housing, wherein an alkaline solution inlet pipe is provided on the upper side of the housing, and a hydrogen chloride tail gas inlet pipe is provided on the lower side of the housing; a stirring device is installed at the upper interior of the housing, and several baffles are fixedly provided at the lower interior of the housing, characterized in that: The baffle plate is inclined inside the box, and the end of the baffle plate connected to the box is higher than the other end of the baffle plate connected to the box. The lower end of the box is provided with a sediment discharge port, a screen is fixed to the sediment discharge port, a discharge pipe is fixed to the lower end of the screen, a valve is fixed to the lower end of the discharge pipe, a cylinder is fixed to the outside of the screen, and an alkali circulation mechanism is connected between the cylinder and the upper inside of the box. The alkali circulation mechanism is used to draw excess alkali from the cylinder to the upper inside of the box. The upper end of the box is connected to a rinsing pipe for rinsing the surface of the baffle liquid.

2. A hydrogen chloride tail gas absorption apparatus according to claim 1, characterised in that: An exhaust port is fixedly provided at the upper end of the box body; The alkali circulation mechanism includes a liquid extraction pipe connected between the cylinder and the upper part of the tank. The liquid extraction pipe is equipped with a water pump, and a nozzle is fixedly installed on the upper part of the liquid extraction pipe inside the tank. The nozzle is located at the bottom of the exhaust port.

3. A hydrogen chloride tail gas absorption apparatus according to claim 1, characterized in that: The valve is a butterfly valve.

4. A hydrogen chloride tail gas absorption apparatus according to claim 1, characterized in that: The stirring device includes a motor fixed to the upper end of the housing, a stirring rod fixed to the output shaft of the motor, and stirring blades fixed to the side of the stirring rod.

5. A hydrogen chloride tail gas absorption apparatus according to claim 1, characterized in that: The flushing pipe has a horizontal tube fixed inside the box. The horizontal tube has liquid outlet holes fixed at equal intervals along its length. The horizontal tube is located above the top layer of liquid baffle and is located at the higher end of the top layer of liquid baffle.

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