A leakage-proof high-temperature fluorine-containing waste gas treatment device

Abstract

The present invention discloses a leakage-proof high-temperature fluorine-containing waste gas treatment device, comprising an adsorption chamber located on the upper side and a cooling chamber located on the lower side separated by a first partition and a second partition; a buffer chamber is formed between the first partition and the second partition; a turbulent ball is arranged in the adsorption chamber, and an air outlet is arranged on the top of the adsorption chamber; an air inlet is arranged on the lower side wall of the cooling chamber, perforated sieve plates are staggered in the cooling chamber, a circulating water inlet is arranged on the upper side wall of the cooling chamber, and a circulating water outlet is also arranged on the lower side wall of the cooling chamber; a first air flotation valve is arranged on the first partition; and a second air flotation valve is arranged on the second partition. The leakage-proof high-temperature fluorine-containing waste gas treatment device of the present invention has good cooling effect in the early stage and sufficient absorption in the later stage, and the anti-leakage effect is enhanced by the double air flotation valve design.

Description

Technical Field

[0001] The present invention belongs to the field of environmental protection treatment, and specifically relates to a waste gas treatment device, and in particular to a leakage-proof high-temperature fluorine-containing waste gas treatment device. Background Art

[0002] Fluorine-containing waste gas treatment technology is to remove fluorine-containing waste gas by absorption, adsorption and other methods. Fluorine-containing waste gas refers to gas containing hydrogen fluoride and silicon tetrafluoride, which mainly comes from industrial production processes; electrolytic aluminum and steelmaking processes in the metallurgical industry; phosphate fertilizer and fluoroplastic production in the chemical industry; ironmaking furnaces in the foundry industry, etc., all of which emit a large amount of fluorine-containing waste gas.

[0003] The main methods for purifying fluorine-containing waste gas are wet absorption and dry adsorption. In dry purification, hydrogen fluoride is directly adsorbed by alumina to obtain fluorine-containing alumina. The wet absorption process uses a liquid absorption method to wash the fluorine-containing waste gas with liquid to achieve the purpose of purification and recovery. The waste gas absorption in the prior art is mostly direct absorption. However, if the high-temperature waste gas generated is also directly absorbed, it will cause the problem of overheating of the absorption liquid. When the temperature rises, the adsorption effect becomes worse. At the same time, when the high-temperature waste gas just comes into contact with the absorption liquid, it may even cause the absorption liquid to boil slightly, which will have an adverse effect on ordinary absorption equipment. At the same time, if a flotation valve is used in the adsorption process, there is a certain probability that it will not be closed in time, resulting in a small amount of leakage.

[0004] Therefore, it is necessary to develop a special leakage-proof high-temperature fluorine-containing waste gas treatment device. Summary of the invention

[0005] In order to overcome the above problems, the present invention provides an anti-leakage treatment device suitable for high-temperature fluorine-containing waste gas, which has good cooling effect in the early stage and sufficient absorption in the later stage, and the anti-leakage effect is enhanced through the double flotation valve design.

[0006] The technical solution of the present invention is to provide a leakage-proof high-temperature fluorine-containing waste gas treatment device, comprising an adsorption chamber located on the upper side and a cooling chamber located on the lower side separated by a first partition and a second partition; a buffer chamber is formed between the first partition and the second partition; an adsorption liquid inlet is arranged on the upper side wall of the adsorption chamber, a turbulent ball is arranged in the adsorption chamber, an air outlet is arranged on the top of the adsorption chamber, and an adsorption liquid outlet is arranged on the lower side wall of the adsorption chamber; an air inlet is arranged on the lower side wall of the cooling chamber, perforated sieve plates are staggered in the cooling chamber, a circulating water inlet is arranged on the upper side wall of the cooling chamber, and a circulating water outlet is also arranged on the lower side wall of the cooling chamber; a first air flotation valve is arranged on the first partition, and one side of the first partition is inclined downward; a waste liquid outlet is arranged on the side wall of the buffer chamber close to the inclined first partition; a second air flotation valve is arranged on the second partition.

[0007] In a preferred embodiment, a sensor is provided on the inclined surface of the first partition. The waste gas enters the buffer chamber after passing through the first air flotation valve, and enters the adsorption chamber through the second air flotation valve in the buffer chamber. In the process of entering the adsorption chamber, even if the second air flotation valve is not closed in time, causing a small amount of leakage, it will leak into the buffer chamber and gather at the inclined plate. When the liquid level of the gathered liquid reaches the position of the sensor, an alarm is sounded. At this time, the staff can stop the machine, open the waste liquid port, and continue to operate after clearing the waste liquid. The design of the double air flotation valve effectively prevents the upper adsorption liquid from entering the lower coolant, causing the alkali liquid to corrode the circulating pump and other equipment.

[0008] In a preferred embodiment, the adsorption liquid inlet is connected to a water inlet pipe, and a plurality of spray heads are arranged at the bottom of the water inlet pipe. The adsorption liquid is a sodium hydroxide adsorption liquid, wherein the sodium hydroxide can be replaced by an alkaline substance such as sodium carbonate, sodium bicarbonate, and ammonia water. The adsorption liquid is sprayed into the adsorption chamber through the spray head, contacts with the gas, and completes the absorption of fluorine.

[0009] In a preferred embodiment, a turbulent ball holder is further provided at the bottom of the adsorption chamber, a partition net is further provided under the spray head, and the turbulent ball is provided between the partition net and the turbulent ball holder. When the gas buoyancy velocity reaches a certain value, the balls are suspended, rotate and tumble violently, and collide with each other to achieve a better mass transfer effect. Preferably, the turbulent ball is a polytetrafluoroethylene turbulent ball. The use of polytetrafluoroethylene balls can prevent the erosion of the balls by fluorine-containing waste gas.

[0010] In a preferred embodiment, a circulating water pipe is connected between the circulating water inlet and outlet, and a circulating water pipe is provided with a circulating pump. The circulating pump continuously passes cooling water into the cooling chamber to perform heat exchange on the high-temperature exhaust gas to cool the high-temperature exhaust gas.

[0011] In a preferred embodiment, a cold trap is further arranged outside the circulating water pipe, and the cooling water after heat exchange can be cooled down again when passing through the cold trap, and recirculated into the cooling chamber to cool the high-temperature exhaust gas. Preferably, the circulating water pipe is arranged in an S shape or a spiral shape, and the above arrangement can further increase the heat transfer area and enhance the cooling effect.

[0012] The beneficial effects of the present invention are:

[0013] 1. The leakage-proof high-temperature fluorine-containing waste gas treatment device of the present invention has a cooling step in advance during the absorption treatment, which reduces the damage of the high-temperature waste gas to the absorption equipment. During the cooling process, the high-temperature waste gas is dispersed into small bubbles through the small holes on the sieve plate, fully contacts with the coolant, and passes through the liquid layer to reach the liquid surface. The heat transfer is sufficient and efficient, so that the temperature of the fluorine-containing waste gas input into the adsorption chamber is greatly reduced.

[0014] 2. The leakage-proof high-temperature fluorine-containing waste gas treatment device of the present invention further strengthens the mass transfer process by setting up turbulent balls, so that the absorption of fluorine-containing waste gas is more complete. The absorbed liquid can be used as a processing raw material for pesticides and other chemical products after treatment.

[0015] 3. The anti-leakage high-temperature fluorine-containing waste gas treatment device of the present invention is provided with a buffer chamber and a double flotation valve to prevent the upper adsorption liquid from falling into the lower cooling liquid through the flotation valve, and has an alarm function to ensure the normal operation of the equipment and effectively reduce the maintenance frequency.

[0016] 4. The leakage-proof high-temperature fluorine-containing waste gas treatment device of the present invention has a simple structure and is easy to use, and is suitable for large-scale industrial high-temperature fluorine-containing waste gas treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Among them, 1-main body, 11-air inlet, 12-air outlet, 21-second partition, 211-second air flotation valve, 22-first partition, 221-first air flotation valve, 222-sensor, 223-waste liquid outlet, 3-adsorption chamber, 31-bracket, 32-turbulence ball, 33-partition net, 34-adsorption liquid inlet, 35-adsorption liquid outlet, 36-water inlet pipe, 37-sprinkler head, 4-cooling chamber, 41-perforated sieve plate, 42-circulating water inlet, 43-circulating water outlet, 44-circulating water pipe, 45-cold trap, 46-circulating pump. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1As shown, it is a leakage-proof high-temperature fluorine-containing waste gas treatment device of the present invention, wherein the leakage-proof high-temperature fluorine-containing waste gas treatment device body 1 includes an adsorption chamber 3 located on the upper side and a cooling chamber located on the lower side separated by a first partition 22 and a second partition 21; a buffer chamber is formed between the first partition 22 and the second partition 21; an adsorption liquid inlet 34 is provided on the upper side wall of the adsorption chamber 3, a turbulent ball 31 made of polytetrafluoroethylene material is provided in the adsorption chamber 3, an air outlet 12 is provided on the top of the adsorption chamber 3, and a cooling chamber 3 is provided on the lower side wall of the adsorption chamber 3. There is an adsorption liquid outlet 35; an air inlet 11 is arranged on the lower side wall of the cooling chamber 4, 6 perforated sieve plates 41 are horizontally staggered in the cooling chamber 4, a circulating water inlet 42 is arranged on the upper side wall of the cooling chamber 4, and a circulating water outlet 43 is also arranged on the lower side wall of the cooling chamber 4; a first air flotation valve 221 is arranged on the first partition plate 22, and one side of the first partition plate 221 is inclined downward; a waste liquid outlet 223 is arranged on the side wall of the buffer chamber close to the inclined first partition plate 221; a second air flotation valve 211 is arranged on the second partition plate 21.

[0021] Furthermore, a sensor 222 is provided on the inclined surface of the first partition plate 22 .

[0022] The adsorption liquid inlet 34 is connected to a water inlet pipe 36 , and a plurality of spray heads 37 facing downward are arranged at the bottom of the water inlet pipe 36 .

[0023] A turbulence ball holder 31 is also provided at the bottom of the adsorption chamber 3, a partition net 33 is also provided below the spray head 37, and the turbulence ball 32 is provided between the partition net 33 and the turbulence ball holder 31, and can move freely with the airflow in the space formed by the partition net 33 and the turbulence ball holder 31. An airway is provided on the turbulence ball holder 31 for gas to be discharged upward.

[0024] A circulating water pipe 44 is connected between the circulating water inlet 42 and the circulating water outlet 43 . A cold trap 45 is arranged on the circulating water pipe 44 . A circulating pump 46 is arranged between the cold trap 45 and the circulating water outlet 43 .

[0025] Furthermore, the circulating water pipe 44 is distributed in an S shape in the cold trap 45 .

[0026] The working principle of the leakage-proof high-temperature fluorine-containing waste gas treatment device of the present invention is: the high-temperature fluorine-containing waste gas enters the cooling chamber through the air inlet, and in the cooling chamber, it becomes small bubbles and floats upward through the action of the perforated sieve plate. At the same time, the cooling water passing through the cold trap is passed into the cooling chamber through the circulating pump to complete the heat exchange with the small bubbles formed by the waste gas. The waste gas gathers at the top of the cooling chamber. When the pressure reaches a limited value, it rushes out of the first air flotation valve and enters the buffer chamber, and then enters the adsorption chamber through the second air flotation valve. When the pressure drops, the air flotation valve is immediately closed. The gas entering the adsorption chamber floats upward and acts on the sprayed adsorption liquid to complete the absorption of fluorine. At the same time, the gas surging upward drives the small balls to move, further strengthening the mass transfer process. The gas passing through the spray head is discharged through the air outlet to complete the purification operation. When the accumulated liquid in the buffer chamber reaches a certain level, an alarm is issued to discharge the liquid. The purification treatment device of the present invention is suitable for high-temperature fluorine-containing waste gas, avoids the damage of the absorption tower by high-temperature waste gas, has good cooling and absorption effects, and can effectively prevent leakage caused by untimely closure of the air flotation valve.

[0027] The above embodiment is only one implementation of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A leakage-proof high-temperature fluorine-containing waste gas treatment device, characterized in that: It includes an adsorption chamber located on the upper side and a cooling chamber located on the lower side, which are separated by a first partition plate and a second partition plate; a buffer chamber is formed between the first partition plate and the second partition plate; The upper side wall of the adsorption chamber is provided with an adsorption liquid inlet, a turbulent ball is provided in the adsorption chamber, an air outlet is provided at the top of the adsorption chamber, and an adsorption liquid outlet is provided on the lower side wall of the adsorption chamber; an air inlet is provided on the lower side wall of the cooling chamber, perforated sieve plates are staggered in the cooling chamber, a circulating water inlet is provided on the upper side wall of the cooling chamber, and a circulating water outlet is also provided on the lower side wall of the cooling chamber; A first air flotation valve is provided on the first partition, and one side of the first partition is inclined downward, and the first air flotation valve is located on the left side of the first partition; A waste liquid port is provided on the side wall of the buffer chamber close to the inclined first partition plate, and a second air flotation valve is provided on the second partition plate, and the second air flotation valve is located on the right side of the second partition plate; The adsorption liquid inlet is connected to a water inlet pipe, a plurality of spray heads are arranged at the bottom of the water inlet pipe, a turbulence ball bracket is also arranged at the bottom of the adsorption chamber, a partition net is also arranged under the spray head, the turbulence ball is arranged between the partition net and the turbulence ball bracket, and the turbulence ball is a polytetrafluoroethylene turbulence ball.

2. The anti-leakage high-temperature fluorine-containing waste gas treatment device according to claim 1, characterized in that: A sensor is disposed on the inclined surface of the first partition.

3. The anti-leakage high-temperature fluorine-containing waste gas treatment device according to claim 1, characterized in that: A circulating water pipe is connected between the circulating water inlet and the circulating water outlet, and a circulating pump is arranged on the circulating water pipe.

4. The anti-leakage high-temperature fluorine-containing waste gas treatment device according to claim 3 is characterized in that: A cold trap is also arranged outside the circulating water pipe.

5. The anti-leakage high-temperature fluorine-containing waste gas treatment device according to claim 3 is characterized in that: The circulating water pipe is arranged in an S-shape or a spiral shape.

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