Acid mist purification device easy to maintain
By setting up an overflow plate in the acid mist purification tower and treating the clear liquid and precipitate separately, the density increase and equipment wear caused by the reaction of alkaline media with carbon dioxide is solved, and the efficient utilization of the media and the safe operation of the equipment are achieved.
Patent Information
- Application Number
- CN202411960249.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-03-21
AI Technical Summary
In the acid mist purification tower, alkaline media reacts with carbon dioxide in the air to form carbonate, resulting in an increase in media density, an increase in pipeline resistance, an increase in circulating pump current and outlet pressure, which increases the risk of equipment wear and leakage, and the equipment is not conducive to safe operation.
By setting up an overflow plate in the acid mist purification tower, the clear liquid overflows to the side close to the circulation pump, and the precipitation is concentratedly collected to the side away from the circulation pump, avoiding the increase in the circulation pump current and outlet pressure, and extending the interval between tower washing and alkali replenishment.
It is achieved to ensure the normal use of the acid mist purification tower, avoid waste caused by the washing tower, extend the service life of the medium, reduce the risk of equipment wear and leakage, and ensure the safe operation of the equipment.
Smart Images
Figure CN119656836A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of acid gas production, and in particular relates to an easy-to-maintain acid mist purification device. Background Art
[0002] In chemical production processes involving the generation of acidic gases, the main purpose of installing an acid mist purification tower device is to enhance ventilation within the workshop and ensure air safety in the production workplace. The medium in the acid mist purification tower is generally an alkaline solution, which can be a KOH aqueous solution or a NaOH aqueous solution.
[0003] In the case of high hydrogen fluoride content in the exhaust gas, the medium in the acid tower is consumed quickly. Generally, the acid mist purification tower needs to be cleaned and replaced once a week and fresh alkaline solution needs to be replenished. In the case of low hydrogen fluoride content in the exhaust gas, if the medium in the acid tower is not consumed within one month, the alkaline solution will react with carbon dioxide in the air to generate carbonates, which will then slowly crystallize and precipitate, causing the medium density and pipeline resistance to increase, the current and outlet pressure of the circulation pump to increase, and the plastic pipe welding points are also at risk of increased leakage. The circulation pump is also at risk of overload operation, and the equipment wear is aggravated, which is not conducive to the safe operation of the equipment.
[0004] In order to avoid the increase of circulating pump current and outlet pressure, one method is to reduce the concentration of alkaline solution, so as to reduce the generated carbonate and avoid excessive change of solution density. However, this method is not conducive to ensuring sufficient amount of alkaline medium. If there is a sudden increase in the amount of tail gas containing hydrogen fluoride, the medium in the acid tower will become acidic and the tail gas cannot be discharged safely. Another method is to replace and clean the acid mist purification tower in time, but because the precipitation accumulates at the bottom, if the acid mist purification tower needs to be replaced and cleaned, all the medium in the acid mist purification tower needs to be pumped out. In addition, it is necessary to replenish water through the liquid replenishment port many times to clean the medium as much as possible. After replenishing the alkaline medium, it can be used normally, which will cause waste of alkaline medium and manpower. Summary of the invention
[0005] In order to solve the problems existing in the background technology, the purpose of this patent is to provide an easy-to-maintain acid mist purification device, which can avoid the waste caused by washing the tower while ensuring the normal use of the acid mist purification tower.
[0006] To achieve the above purpose, the technical solution of this patent is: an easy-to-maintain acid mist purification device, including a circulation pump, an acid mist purification tower, and an induced draft fan; the top outlet of the acid mist purification tower is connected to the inlet of the induced draft fan; the circulation pump is connected to the acid mist purification tower to form a circulation loop; a demister is arranged in the acid mist purification tower, a spray head is arranged below the demister, a packing layer is arranged below the spray head, and a drainage plate is arranged below the packing layer; an overflow plate is arranged at the bottom of the acid mist purification tower, and the overflow plate divides the bottom of the acid mist purification tower into two parts away from and close to the circulation pump; the lower end of the drainage plate points to the side away from the circulation pump, and the high end is located below the packing layer; the air inlet is arranged between the high end of the drainage plate and the packing layer; the lower end of the drainage plate is higher than the top of the overflow plate. The drainage plate can be a flat plate or a folded plate.
[0007] Furthermore, an acid tower drain valve is provided at the bottom of the acid mist purification tower on one side away from the circulation pump.
[0008] Furthermore, a liquid replenishing port is arranged in the middle section of the wall of the acid mist purification tower; the liquid replenishing port is arranged below the drainage plate.
[0009] Furthermore, the exhaust tower is connected to the exhaust fan outlet. Furthermore, the exhaust tower is provided with a drain valve, and the exhaust tower drain valve is located lower than the exhaust tower inlet; the exhaust fan outlet is connected to the lower part of the exhaust tower, and the top of the exhaust tower is connected to the atmosphere.
[0010] Furthermore, the filler of the packing layer is preferably a ball ring made of a plastic material, and the plastic material is PP or PVC.
[0011] Furthermore, the acid mist purification tower is provided with a liquid level gauge, which is preferably arranged on the same side as the circulating pump. The liquid level gauge is preferably a magnetic flap liquid level gauge or an external liquid level gauge.
[0012] Furthermore, the acid mist purification device is arranged in the cofferdam.
[0013] The acid mist purification tower replenishment port is used to replenish fresh alkaline solution into the acid mist purification tower. The replenishment method can be to directly replenish the prepared alkaline solution, or to replenish a relatively concentrated alkaline solution and water separately, and circulate and mix them in the tower. The alkaline solution can be a KOH aqueous solution or a NaOH aqueous solution.
[0014] The alkaline solution in the acid mist purification tower is circulated by the circulation pump and sprayed out from the spray head in the acid mist purification tower. It is fully in contact with the tail gas entering the air inlet in the packing layer. The hydrogen fluoride in the tail gas is fully absorbed. Then the alkaline solution is drained through the drainage plate and concentrated into the side of the acid mist purification tower away from the circulation pump. The upper clear liquid overflows to the side close to the circulation pump and continues to circulate. The precipitation is concentrated on the side away from the circulation pump. The setting of the acid tower drain valve facilitates the discharge of precipitation.
[0015] Compared with the prior art, this technical solution has the following beneficial effects: 1. Through the setting of overflow plate, the clear liquid overflows to the side close to the circulation pump and circulates through the circulation pump, while the sediment can be collected and concentrated on the side far away from the circulation pump, avoiding the increase of current and outlet pressure of the circulation pump, thus ensuring the normal use of the acid mist purification tower.
[0016] 2. Since the precipitate can be collected and circulated by the circulating pump, the medium is clear liquid. Even if precipitation occurs inside, there is no need to wash the tower immediately. At the same time, carbonates can be dissolved during subsequent water replenishment, which can extend the interval between tower washing and alkali replenishment. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the easy-to-maintain acid mist purification device in Example 1.
[0018] Figure 2 This is a schematic diagram of the easy-to-maintain acid mist purification device in Example 2.
[0019] Figure 3 Schematic diagram of the internal structure of the acid mist purification tower.
[0020] 1. Circulation pump 2. Liquid replenishment port 3. Acid mist purification tower 3.1. Demister 3.2. Sprinkler head 3.3. Packing layer 3.4. Drain plate 3.5. Overflow plate 4. Acid tower drain valve 5. Induced draft fan 6. Emptying tower 7. Emptying tower drain valve 8. Cofferdam 9. Air inlet DETAILED DESCRIPTION
[0021] The present invention is further explained below in conjunction with specific embodiments. The following embodiments are only explanations of the present invention, not limitations of the present invention, and technical solutions obtained by simple substitution and superposition based on the present invention should fall within the protection scope of the present invention.
[0022] Example 1
[0023] like Figure 1 , Figure 3 As shown, an easy-to-maintain acid mist purification device is arranged in a cofferdam 8, including a circulation pump 1, an acid mist purification tower 3, and an induced draft fan 5; the top outlet of the acid mist purification tower is connected to the inlet of the induced draft fan 5; the circulation pump is connected to the acid mist purification tower to form a circulation loop; a demister 3.1 is arranged in the acid mist purification tower, a spray head is arranged below the demister, a packing layer 3.3 is arranged below the spray head 3.2, and a guide plate 3.4 is arranged below the packing layer; an overflow plate 3.5 is arranged at the bottom of the acid mist purification tower, and the overflow plate divides the bottom of the acid mist purification tower into two parts away from and close to the circulation pump; the lower end of the guide plate faces the side away from the circulation pump, and the high end is located under the packing layer; the air inlet 9 is arranged between the high end of the guide plate and the packing layer; the lower end of the guide plate is higher than the top of the overflow plate. The guide plate is a folded plate shape.
[0024] A liquid replenishment port 2 is provided in the middle section of the wall of the acid mist purification tower 3 for connecting a liquid replenishment pipeline, which is used to replenish fresh alkaline solution into the acid mist purification tower 3; the liquid replenishment port is arranged below the drainage plate.
[0025] An acid tower drain valve 4 is also provided on the side of the bottom of the acid mist purification tower 3 away from the circulating pump 1 .
[0026] Example 2
[0027] like Figure 1 , Figure 3 As shown, an easy-to-maintain acid mist purification device is arranged in a cofferdam 8, including a circulation pump 1, an acid mist purification tower 3, and an induced draft fan 5; the top outlet of the acid mist purification tower is connected to the inlet of the induced draft fan 5; the circulation pump is connected to the acid mist purification tower to form a circulation loop; a demister 3.1 is arranged in the acid mist purification tower, a spray head is arranged below the demister, a packing layer 3.3 is arranged below the spray head 3.2, and a guide plate 3.4 is arranged below the packing layer; an overflow plate 3.5 is arranged at the bottom of the acid mist purification tower, and the overflow plate divides the bottom of the acid mist purification tower into two parts away from and close to the circulation pump; the lower end of the guide plate faces the side away from the circulation pump, and the high end is located under the packing layer; the air inlet 9 is arranged between the high end of the guide plate and the packing layer; the lower end of the guide plate is higher than the top of the overflow plate. The guide plate is a folded plate shape.
[0028] A liquid replenishment port 2 is provided in the middle section of the wall of the acid mist purification tower 3 for connecting a liquid replenishment pipeline, which is used to replenish fresh alkaline solution into the acid mist purification tower 3; the liquid replenishment port is arranged below the drainage plate.
[0029] An acid tower drain valve 4 is also provided on the side of the bottom of the acid mist purification tower 3 away from the circulating pump 1 .
[0030] The acid mist purification tower is filled with an alkaline solution, which is a KOH aqueous solution or a NaOH aqueous solution. In this embodiment, the KOH aqueous solution is selected.
[0031] The induced draft fan air outlet is connected to the exhaust tower 6, the induced draft fan 5 air outlet is connected to the exhaust tower air inlet at the bottom of the exhaust tower 6, and the top of the exhaust tower 6 is directly connected to the atmosphere.
[0032] A drain valve 7 is also provided at the bottom of the drain tower 6, and the drain valve 7 is located lower than the air inlet of the drain tower.
[0033] The filler used in the packing layer is a ball ring made of a plastic material. The plastic material is PP or PVC, and the ball ring made of PP material is selected in this embodiment.
[0034] A liquid level gauge is provided on the side of the acid mist purification tower 3 close to the circulating pump 1. The liquid level gauge in this embodiment is a magnetic flap liquid level gauge.
Claims
1. An easy-to-maintain acid mist purification device, comprising a circulation pump (1), an acid mist purification tower (3), and an induced draft fan (5); the top outlet of the acid mist purification tower (3) is connected to the inlet of the induced draft fan (5); the circulation pump (1) is connected to the acid mist purification tower (3) to form a circulation loop; a demister (3.1) is arranged in the acid mist purification tower (3), a spray head (3.2) is arranged below the demister (3.1), a packing layer (3.3) is arranged below the spray head (3.2), and a guide plate (3.4) is arranged below the packing layer (3.3); an overflow plate (3.5) is arranged at the bottom of the acid mist purification tower (3), and the overflow plate (3.5) divides the bottom of the acid mist purification tower into two parts away from and close to the circulation pump; the lower end of the guide plate (3.4) points to the side away from the circulation pump, and the upper end is located below the packing layer; the air inlet (9) is arranged between the upper end of the guide plate and the packing layer; the lower end of the guide plate is higher than the top of the overflow plate.
2. The easy-to-maintain acid mist purification device according to claim 1, characterized in that: An acid tower drain valve (4) is provided at the bottom of the acid mist purification tower (3) on a side away from the circulation pump.
3. The easy-to-maintain acid mist purification device according to claim 1, characterized in that: A liquid replenishing port (2) is provided in the middle section of the wall of the acid mist purification tower; the liquid replenishing port (2) is provided below the drainage plate (3.4).
4. The easy-to-maintain acid mist purification device according to claim 1, characterized in that: The induced draft fan outlet is connected to an exhaust tower (6).
5. The easy-to-maintain acid mist purification device according to claim 4, characterized in that: The drain tower (6) is provided with a drain valve, and the drain tower drain valve (7) is located below the drain tower air inlet; the exhaust fan outlet is connected to the lower part of the drain tower, and the top of the drain tower is connected to the atmosphere.
6. The easy-to-maintain acid mist purification device according to claim 1, characterized in that: The packing of the packing layer is ball ring made of plastic material.
7. The easy-to-maintain acid mist purification device according to claim 7, characterized in that: The plastic material is PP or PVC.
8. The easy-to-maintain acid mist purification device according to claim 1, characterized in that: The acid mist purification tower is equipped with a liquid level meter.
9. The easy-to-maintain acid mist purification device according to claim 8, characterized in that: The liquid level meter is arranged on the same side as the circulating pump; the liquid level meter is a magnetic flap liquid level meter or an external liquid level meter.
10. The easy-to-maintain acid mist purification device according to claim 1, characterized in that: Easy to maintain: the acid mist purification device is arranged in the cofferdam (8).