VOC (volatile organic compound) absorption tower

Abstract

The utility model relates to a VOC (volatile organic compound) absorption tower, in particular to a VOC absorption tower which comprises a spray tower, and an air inlet pipe is fixedly mounted at the bottom of the side wall of the spray tower; a first-stage spraying chamber and a second-stage spraying chamber are formed on the inner side of the spraying tower in the gas flowing direction, the first-stage spraying chamber and the second-stage spraying chamber are separated through a water distribution partition plate, and a channel for gas to pass through is formed in the water distribution partition plate; the system further comprises a first-stage circulating spraying mechanism and a second-stage circulating spraying mechanism, and the first-stage circulating spraying mechanism and the second-stage circulating spraying mechanism are used for spraying washing water into the first-stage spraying chamber and the second-stage spraying chamber respectively and recycling the washing water after VOC absorption. An overflow part is further arranged between the first-stage circulating spraying mechanism and the second-stage circulating spraying mechanism, leaching water in the second-stage circulating spraying mechanism can flow towards the first-stage circulating spraying mechanism through the overflow part, and due to the arrangement of the overflow part, water can be saved, the sewage discharge amount can be reduced, and the operation cost of VOC absorption can be saved.

Description

Technical Field

[0001] The utility model relates to a VOC absorption tower, in particular to a VOC absorption tower. Background Art

[0002] The various production processes in the chemical and pharmaceutical industries: chemical reactions, distillation, centrifugation, drying, and vacuuming, etc., will produce various tail gases. The tail gases contain volatile organic compounds (VOCs), such as methanol, ethanol, acetonitrile, acetone, formaldehyde, etc. VOCs will pollute the environment and harm the health of operators. Measures should be taken to minimize their adverse effects.

[0003] At present, the main treatment facilities are VOC absorption devices, which collect exhaust gases through gas collecting pipes. The exhaust gases are washed with water in the VOC tower and discharged through the discharge port on the top of the VOC tower. The washing liquid that absorbs VOC is regularly discharged to the sewage treatment station for treatment.

[0004] The main disadvantage of existing VOC absorption towers is that the absorption effect of VOC is poor. This device has a primary circulating water elution in the tower. When the VOC concentration of the elution water reaches a certain level and it is judged that the water should be changed, it is discharged to the sewage station, and then new water is added to the tower, and this cycle is repeated. During use, as time goes by, the concentration of organic matter in the elution water becomes higher and higher, and its continued absorption of VOC will inevitably become worse and worse. In fact, the absorption of VOC in the later period of a use cycle is incomplete. At this time, even if the elution water is discharged while new water is added, the VOC absorption effect is not improved well because the VOC concentration in the elution water decreases only slightly. Frequent replacement of elution water can also improve the above situation, but this approach will greatly increase the amount of sewage and increase the cost of sewage treatment. Utility Model Content

[0005] The purpose of the utility model is to provide a VOC absorption tower to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A VOC absorption tower comprises a spray tower, wherein an air inlet pipe is fixedly mounted on the bottom of a side wall of the spray tower;

[0008] A primary spray chamber and a secondary spray chamber are formed on the inner side of the spray tower along the gas flow direction, the primary spray chamber and the secondary spray chamber are separated by a water dividing baffle, and a channel for gas to pass through is provided on the water dividing baffle;

[0009] It also includes a primary circulation spray mechanism and a secondary circulation spray mechanism, which are used to spray washing water into the primary spray chamber and the secondary spray chamber respectively, and recover the washing water after absorbing VOC;

[0010] An overflow piece is also provided between the primary circulation spray mechanism and the secondary circulation spray mechanism, and the washing water in the secondary circulation spray mechanism can flow toward the primary circulation spray mechanism through the overflow piece.

[0011] The VOC absorption tower as described above: the primary spray mechanism comprises a primary spray pipe disposed in the primary spray chamber and close to the water dividing baffle, the primary spray pipe being connected to the primary circulating water tank via a water pump;

[0012] The primary circulation water tank is also connected to a primary circulation pipe, and one end of the primary circulation pipe away from the primary circulation water tank is inserted into the inner bottom of the primary spray chamber.

[0013] The VOC absorption tower as described above: the secondary spray mechanism comprises a secondary spray pipe disposed in the secondary spray chamber and close to the gas outlet end of the secondary spray chamber, and the secondary spray pipe is connected to the secondary circulation water tank through another water pump;

[0014] The secondary circulation water tank is also connected to a secondary circulation pipe, and one end of the secondary circulation pipe away from the secondary circulation water tank is inserted into the inner bottom of the secondary spray chamber.

[0015] The VOC absorption tower as described above: the overflow member includes an overflow pipe, one end of which is connected to the top of the side wall of the secondary circulating water tank, and the other end of which is connected to the top of the primary circulating water tank.

[0016] The VOC absorption tower as described above: the first-level spray chamber and the second-level spray chamber are both provided with filter elements, the filter elements include filter screens, and a plurality of suspended balls are provided on one side of the filter screen along the gas flow direction.

[0017] The VOC absorption tower as described above: an air inlet is provided on the water dividing baffle, and a water-isolating pipe corresponding to the air inlet is fixedly installed on the water dividing baffle.

[0018] The VOC absorption tower as described above: the water-blocking pipe includes a connecting pipe connected to the water-dividing baffle, a water-blocking cap is installed on the connecting pipe, and an air-conducting groove for gas circulation is formed between the connecting pipe and the water-blocking cap.

[0019] The VOC absorption tower as described above: an exhaust pipe is fixedly installed on the top of the spray tower, and an arc-shaped cap is fixedly installed on the top of the exhaust pipe.

[0020] Compared with the prior art, the utility model has the following beneficial effects: the water dividing baffle can separate the spray tower into two independent spray chambers without affecting the normal circulation of tail gas; the overflow part can transport the spray water overflowed from the secondary circulation spray mechanism to the primary circulation spray mechanism for the primary circulation spray mechanism to recycle VOC. New water is added to the secondary circulation spray mechanism to keep the VOC concentration of the spray water in the secondary circulation spray mechanism at a low level; when the water concentration rises to a certain level, it is discharged to the primary circulation spray mechanism for continued use, and the spray water with higher concentration in the original primary circulation spray mechanism is discharged to the sewage treatment station for further treatment; through the mutual cooperation and alternating action of the primary circulation spray mechanism and the secondary circulation spray mechanism, the VOC in the tail gas can be fully absorbed, greatly improving the removal rate of VOC in the tail gas. Because the exhaust gas is washed with high-concentration and low-concentration water in turn, VOC is removed more thoroughly, reducing the impact of production activities on the environment and improving labor protection; the setting of overflow parts can save water, reduce sewage discharge, and save the operating cost of VOC absorption; because the water consumption and sewage volume of the VOC tower are reduced, the sewage treatment cost is also reduced accordingly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the VOC absorption tower.

[0022] Figure 2 This is a schematic diagram of the structure of the water-dividing baffle in the VOC absorption tower.

[0023] Figure 3 This is a schematic diagram of the structure of the water-isolating pipe in the VOC absorption tower.

[0024] In the figure: 1, spray tower; 101, primary spray room; 102, secondary spray room; 103, air inlet pipe;

[0025] 2. Filter;

[0026] 3. Suspended ball;

[0027] 4. Water dividing baffle; 401. Air inlet;

[0028] 5. Exhaust pipe;

[0029] 6. Arc cap;

[0030] 7. Primary circulating water tank;

[0031] 8. Secondary circulating water tank;

[0032] 9. Secondary spray pipe;

[0033] 10. Secondary circulation pipe;

[0034] 11. Primary spray pipe;

[0035] 12. Primary circulation pipe;

[0036] 13. Overflow pipe;

[0037] 14. Waterproof pipe; 1401. Connecting pipe; 1402. Waterproof cap; 1403. Air guide groove. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0039] See also Figure 1 to Figure 3 As an embodiment of the utility model, the VOC absorption tower comprises a spray tower 1, and an air inlet pipe 103 is fixedly installed on the bottom of the side wall of the spray tower 1;

[0040] A primary spray chamber 101 and a secondary spray chamber 102 are formed inside the spray tower 1 along the gas flow direction. The primary spray chamber 101 and the secondary spray chamber 102 are separated by a water dividing baffle 4, and a channel for gas to pass through is provided on the water dividing baffle 4.

[0041] It also includes a primary circulation spray mechanism and a secondary circulation spray mechanism, which are used to spray washing water into the primary spray chamber 101 and the secondary spray chamber 102 respectively, and recover the washing water after absorbing VOC;

[0042] An overflow piece is also provided between the primary circulation spray mechanism and the secondary circulation spray mechanism, and the washing water in the secondary circulation spray mechanism can flow toward the primary circulation spray mechanism through the overflow piece.

[0043] In this embodiment, the industrial exhaust gas enters the spray tower 1 through the air inlet pipe 103 and flows from the bottom to the top of the spray tower 1; passes through the primary spray chamber 101 and enters the secondary spray chamber 102 through the water dividing baffle 4.

[0044] First, when the tail gas is in the primary spray chamber 101, the primary circulating spray mechanism will circulate and spray water, and absorb the VOC in the tail gas through the spray water to reduce the VOC content in the tail gas.

[0045] When in the secondary exhaust gas spray chamber 102, the secondary circulating spray mechanism will also circulate and spray water, and absorb the VOC in the exhaust gas through the spray water to further reduce the VOC content in the exhaust gas.

[0046] The water dividing baffle 4 can prevent the spray water in the secondary spray chamber 102 from entering the primary spray chamber 101 . Meanwhile, the tail gas in the primary spray chamber 101 can also enter the secondary spray chamber 102 through the channel on the water dividing baffle 4 .

[0047] The overflow part can transport the spray water overflowed from the secondary circulation spray mechanism to the primary circulation spray mechanism for VOC recovery. New water is added to the secondary circulation spray mechanism to keep the VOC concentration of the spray water in the secondary circulation spray mechanism at a low level; when the concentration of the water body rises to a certain level, it is discharged to the primary circulation spray mechanism for continued use, and the spray water with a higher concentration in the original primary circulation spray mechanism is discharged to the sewage treatment station for further treatment.

[0048] Through the mutual cooperation and alternating action of the primary circulation spray mechanism and the secondary circulation spray mechanism, VOC in the tail gas can be fully absorbed, greatly improving the removal rate of VOC in the tail gas. Because the tail gas is successively washed with high-concentration and low-concentration water, VOC is removed more thoroughly, reducing the impact of production activities on the environment and improving labor protection; the setting of overflow parts can save water, reduce sewage discharge, and save the operating cost of VOC absorption; because the water consumption and sewage volume of the VOC tower are reduced, the sewage treatment cost is also reduced accordingly.

[0049] As a further solution of the utility model, the primary spray mechanism includes a primary spray pipe 11 disposed in the primary spray chamber 101 and close to the water dividing baffle 4, and the primary spray pipe 11 is connected to the primary circulating water tank 7 through a water pump;

[0050] The primary circulation water tank 7 is also connected to a primary circulation pipe 12 , and one end of the primary circulation pipe 12 away from the primary circulation water tank 7 is inserted into the inner bottom of the primary spray chamber 101 .

[0051] In this embodiment, the water pump will transport the spray water in the primary circulation water tank 7 to the primary spray pipe 11, and the nozzle on the primary spray pipe 11 will continue to spray the spray water into the primary spray chamber 101 to absorb the VOC in the tail gas; the spray water after absorption will fall to the bottom of the primary spray chamber 101 and flow back to the primary circulation water tank 7 through the primary circulation pipe 12. Absorption in the form of spraying can increase the contact time between the spray water and the tail gas, greatly improve the absorption effect of the spray water, and improve the removal rate of VOC.

[0052] As a further solution of the utility model, the secondary spray mechanism includes a secondary spray pipe 9 arranged in the secondary spray chamber 102 and close to the air outlet end of the secondary spray chamber 102, and the secondary spray pipe 9 is connected to the secondary circulation water tank 8 through another water pump;

[0053] The secondary circulation water tank 8 is also connected to a secondary circulation pipe 10 , and one end of the secondary circulation pipe 10 away from the secondary circulation water tank 8 is inserted into the inner bottom of the secondary spray chamber 102 .

[0054] In this embodiment, the water pump will transport the spray water in the secondary circulation water tank 8 to the secondary spray pipe 9, and the nozzle on the secondary spray pipe 9 will continue to spray the spray water into the secondary spray chamber 102 to further absorb the VOC in the tail gas; the spray water after absorption will fall to the bottom of the secondary spray chamber 102 (on the water dividing baffle 4), and flow back to the secondary circulation water tank 8 through the secondary circulation pipe 10. Absorption in the form of spraying can increase the contact time between the spray water and the tail gas, can greatly improve the absorption effect of the spray water, and improve the removal rate of VOC.

[0055] As a further solution of the utility model, the overflow member includes an overflow pipe 13 , one end of which is connected to the top of the side wall of the secondary circulating water tank 8 , and the other end of which is connected to the top of the primary circulating water tank 7 .

[0056] In this embodiment, when the head height of the spray water in the secondary circulating water tank 8 is higher than the height at which the overflow pipe 13 is connected to the secondary circulating water tank 8, the spray water will flow into the primary circulating water tank 7 along the overflow pipe 13, and the primary circulating spray mechanism will work and be used. New water is added to the secondary circulating spray mechanism to keep the VOC concentration of the spray water in the secondary circulating spray mechanism at a low level; when the concentration of the water body rises to a certain level, it is discharged to the primary circulating spray mechanism for continued use, and the spray water with a higher concentration in the original primary circulating spray mechanism is discharged to the sewage treatment station for further treatment. The setting of the overflow part can save water, reduce the amount of sewage discharged, and save the operating cost of VOC absorption; because the water consumption and sewage generated by the VOC tower are reduced, the sewage treatment cost is also reduced accordingly.

[0057] As a further solution of the utility model, a filter is provided in both the first-stage spray chamber 101 and the second-stage spray chamber 102. The filter comprises a filter screen 2. A plurality of suspension balls 3 are provided on one side of the filter screen 2 along the gas flow direction.

[0058] In this embodiment, the filter screen 2 can receive the suspension ball 3 without affecting the circulation of exhaust gas and spray water; the suspension ball 3 can increase the contact area and contact time between the spray water and the exhaust gas to improve the absorption effect of the spray water on VOC, improve the removal rate of VOC, reduce the impact of production activities on the environment, and improve labor protection.

[0059] As a further solution of the utility model, an air inlet 401 is opened on the water-dividing baffle 4, and a water-blocking pipe 14 corresponding to the air inlet 401 is fixedly installed on the water-dividing baffle 4. The water-blocking pipe includes a connecting pipe 1401 connected to the water-dividing baffle 4, and a water-blocking cap 1402 is installed on the connecting pipe 1401, and an air guide groove 1403 for gas circulation is formed between the connecting pipe 1401 and the water-blocking cap 1402.

[0060] In this embodiment, the water-proof cap 1402 can prevent the spray water sprayed by the secondary spray pipe 9 from falling into the primary spray chamber 101. The exhaust gas preliminarily treated by the primary circulation spray mechanism will enter the connecting pipe 1401 along the air inlet 401 on the water dividing baffle 4, and enter the secondary spray chamber 102 from the air guide groove 1403 for further purification of the secondary circulation spray mechanism.

[0061] As a further solution of the utility model, an exhaust pipe 5 is fixedly installed on the top of the spray tower 1 , and an arc-shaped cover cap 6 is fixedly installed on the top of the exhaust pipe 5 .

[0062] In this embodiment, the treated exhaust gas is discharged from the spray tower 1 through the exhaust pipe 5. The arc-shaped cap 6 can prevent external interference factors from entering the spray tower 1, and can reduce the flow rate of the exhaust gas, increase the treatment time of the exhaust gas in the secondary spray chamber 102, and improve the removal rate of VOC.

[0063] The above embodiments are exemplary rather than restrictive, so without departing from the spirit or basic features of the present invention, the technical solutions of the present invention that can be implemented in other specific forms are all included in the present invention.

Claims

1. A VOC absorption tower, comprising a spray tower (1), wherein an air inlet pipe (103) is fixedly mounted on the bottom of a side wall of the spray tower (1); It is characterized in that A primary spray chamber (101) and a secondary spray chamber (102) are formed on the inner side of the spray tower (1) along the gas flow direction, the primary spray chamber (101) and the secondary spray chamber (102) are separated by a water dividing baffle (4), and a channel for gas to pass through is provided on the water dividing baffle (4); It also includes a primary circulation spray mechanism and a secondary circulation spray mechanism, the primary circulation spray mechanism and the secondary circulation spray mechanism are used to spray washing water into the primary spray chamber (101) and the secondary spray chamber (102) respectively, and recover the washing water after absorbing VOC; An overflow member is also provided between the primary circulation spray mechanism and the secondary circulation spray mechanism, and the washing water in the secondary circulation spray mechanism can flow toward the primary circulation spray mechanism through the overflow member.

2. A VOC absorption tower according to claim 1, characterized in that: The primary circulation spray mechanism comprises a primary spray pipe (11) arranged in the primary spray chamber (101) and close to the water dividing baffle (4), and the primary spray pipe (11) is connected to the primary circulation water tank (7) through a water pump; The primary circulation water tank (7) is also connected to a primary circulation pipe (12), and one end of the primary circulation pipe (12) away from the primary circulation water tank (7) is inserted into the inner bottom of the primary spray chamber (101).

3. A VOC absorption tower according to claim 2, characterized in that: The secondary circulation spray mechanism comprises a secondary spray pipe (9) arranged in the secondary spray chamber (102) and close to the air outlet end of the secondary spray chamber (102), and the secondary spray pipe (9) is connected to the secondary circulation water tank (8) through another water pump; The secondary circulation water tank (8) is also connected to a secondary circulation pipe (10), and one end of the secondary circulation pipe (10) away from the secondary circulation water tank (8) is inserted into the inner bottom of the secondary spray chamber (102).

4. A VOC absorption tower according to claim 3, characterized in that: The overflow member comprises an overflow pipe (13), one end of which is connected to the top of the side wall of the secondary circulating water tank (8), and the other end of which is connected to the top of the primary circulating water tank (7).

5. A VOC absorption tower according to claim 4, characterized in that: A filter element is provided in both the first-stage spray chamber (101) and the second-stage spray chamber (102), wherein the filter element comprises a filter screen (2), and a plurality of suspension balls (3) are provided on one side of the filter screen (2) along the gas flow direction.

6. A VOC absorption tower according to claim 1, characterized in that: An air inlet (401) is provided on the water-dividing baffle (4), and a water-blocking pipe (14) corresponding to the air inlet (401) is fixedly mounted on the water-dividing baffle (4).

7. A VOC absorption tower according to claim 6, characterized in that: The water-blocking pipe comprises a connecting pipe (1401) connected to the water-dividing baffle (4), a water-blocking cap (1402) is installed on the connecting pipe (1401), and an air-guiding groove (1403) for gas circulation is formed between the connecting pipe (1401) and the water-blocking cap (1402).

8. A VOC absorption tower according to claim 1, characterized in that: An exhaust pipe (5) is fixedly mounted on the top of the spray tower (1), and an arc-shaped cover cap (6) is fixedly mounted on the top of the exhaust pipe (5).

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