A device for deodorizing tail gas by spray drying

Abstract

The utility model discloses a kind of spray dry tail gas deodorization treatment device, belong to tail gas processing technical field, the deodorization treatment device includes pipe body, tail gas enters by the first direction end of pipe body, tail gas flows from the first direction end of pipe body to the second direction end of pipe body, circulation spraying assembly is equipped in pipe body, circulation spraying assembly can spray atomized water droplet in pipe body, to carry out spray washing to tail gas, and the direction of circulation spraying assembly spray atomized water droplet is opposite with the flow direction of tail gas, to increase the contact area and contact time of atomized water droplet and tail gas.The utility model reverse spraying makes atomized water droplet and tail gas form counterflow contact, significantly increase the relative velocity and contact path length of gas-liquid two-phase, compared with forward spraying, processing efficiency can be improved 30%-50%, and reverse spraying creates greater concentration gradient difference, so that peculiar smell substance in tail gas can be more efficiently transferred from gas phase to liquid phase, thereby being absorbed or reacted to remove.

Description

Technical Field

[0001] This utility model belongs to the field of exhaust gas treatment technology, and in particular relates to a spray-dried exhaust gas deodorization treatment device. Background Technology

[0002] Among current fermentation methods, spray drying has been widely recognized by practitioners for its advantages such as high production efficiency, good preservation of product activity, high product purity, good product flowability, and relatively low cost. However, with increasing attention to air odor and stricter control requirements, the exhaust gas treatment of this spray drying process has significant problems.

[0003] To solve the problem of exhaust odor, the mainstream method is now three-stage treatment: first, the sprayed exhaust gas is fed into an activated carbon box to absorb the odor; second, the sprayed exhaust gas is fed into a two-stage spray tower, namely acid spray and alkaline spray, or biological deodorization. However, three-stage treatment has problems such as low efficiency, insignificant deodorization effect, high equipment cost, and difficult operation.

[0004] Therefore, there is an urgent need to design a spray-dried exhaust gas deodorization treatment device to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this invention is to provide a spray-dried exhaust gas deodorization treatment device, which has the advantages of improving treatment efficiency and reducing air pollution, and solves the problems mentioned in the background art.

[0006] To achieve the above objectives, the specific technical solution of the spray-drying exhaust gas deodorization treatment device of this utility model is as follows: A spray-dry exhaust gas deodorization treatment device includes a pipe body. The first direction end of the pipe body is for exhaust gas to enter and the exhaust gas flows from the first direction end of the pipe body to the second direction end of the pipe body. A circulating spray assembly is provided inside the pipe body. The circulating spray assembly can spray atomized water droplets inside the pipe body to spray and wash the exhaust gas. The direction of spraying atomized water droplets by the circulating spray assembly is opposite to the flow direction of the exhaust gas to increase the contact area and contact time between the atomized water droplets and the exhaust gas.

[0007] Furthermore, the pipe is tilted, with the first end of the pipe lower than the second end, which further increases the contact area and contact time between the atomized water droplets and the exhaust gas when the exhaust gas flows from the first end to the second end of the pipe.

[0008] Furthermore, the circulating spray assembly includes multiple spray heads, all of which are connected to the pipe body, and the direction of the spray atomized water droplets from the multiple spray heads is opposite to the direction of the exhaust gas flow.

[0009] Furthermore, the circulating spray assembly also includes multiple first water receiving tanks, all of which are located inside the pipe body, and the spray wastewater flows into the first water receiving tanks by its own gravity.

[0010] Furthermore, the number of spray heads and the number of first water receiving tanks are the same, and each first water receiving tank is located at the first direction end of its adjacent spray head.

[0011] Furthermore, the spray head at the second direction end is connected to a water inlet pipe, and the spray head at the second direction end is connected to an external water source through the water inlet pipe. All spray heads except the spray head at the second direction end are connected to a connecting pipe, and the spray heads except the spray head at the second direction end are connected to the first water receiving tank adjacent to their second direction end through the connecting pipe.

[0012] Furthermore, a first drain pipe is connected to the first water receiving tank at the first direction end, and the first water receiving tank at the first direction end is connected to an external sewage tank through the first drain pipe.

[0013] Furthermore, a condensation component is provided at the first directional end of the pipe body. The condensation component cools the exhaust gas entering the pipe body, causing the water vapor in the exhaust gas to condense and form condensate. Subsequently, the remaining exhaust gas is sprayed and washed by the circulating spray component.

[0014] Furthermore, a second water collection tank is provided inside the pipe, located at the first direction end of the condensation assembly, to collect condensate.

[0015] Furthermore, a second drain pipe is connected to the second water receiving tank, and the second water receiving tank is connected to an external sewage tank through the second drain pipe.

[0016] This invention has the following advantages: Reverse spraying causes the atomized water droplets to form countercurrent contact with the exhaust gas, which significantly increases the relative velocity and contact path length of the gas and liquid phases. Compared with forward spraying, the treatment efficiency can be improved by 30%-50%. Moreover, reverse spraying creates a larger concentration gradient difference, which allows odor substances in the exhaust gas to be transferred from the gas phase to the liquid phase more efficiently, thereby being absorbed or removed by reaction. At the same time, by increasing the contact area and contact time between the atomized water droplets and the exhaust gas, the high removal efficiency of the device for odor pollutants is fundamentally guaranteed. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the pretreatment device of this utility model; Figure 2 This is a cross-sectional structural diagram of the pretreatment device of this utility model; The markings in the diagram are as follows: 1. Pipe body; 2. Circulating spray assembly; 21. Spray head; 22. First water receiving tank; 23. Connecting pipe; 24. Water inlet pipe; 25. First drain pipe; 3. Condensation assembly; 32. Second water receiving tank; 33. Second drain pipe. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0020] The following is a reference to the appendix. Figure 1 To be continued Figure 2 This invention describes a spray-dried exhaust gas deodorization treatment device.

[0021] To solve the problem of exhaust odor, the mainstream method is now three-stage treatment: first, the sprayed exhaust gas is fed into an activated carbon box to absorb the odor; second, the sprayed exhaust gas is fed into a two-stage spray tower, namely acid spray and alkaline spray, or biological deodorization. However, three-stage treatment has problems such as low efficiency, insignificant deodorization effect, high equipment cost, and difficult operation.

[0022] Therefore, this deodorization treatment device includes a pipe body 1. The exhaust gas enters from the first direction A end of the pipe body 1 and flows from the first direction A end of the pipe body 1 to the second direction B end of the pipe body 1. A circulating spray assembly 2 is provided inside the pipe body 1. The circulating spray assembly 2 can spray atomized water droplets inside the pipe body 1 to spray and wash the exhaust gas. The direction of spraying atomized water droplets by the circulating spray assembly 2 is opposite to the flow direction of the exhaust gas to increase the contact area and contact time between the atomized water droplets and the exhaust gas.

[0023] The first direction, end A, is the inlet end of pipe body 1, and also the exhaust gas inlet end.

[0024] The second direction, end B, is the outlet end of pipe body 1, which is also the exhaust gas discharge end.

[0025] The first direction A is opposite to the second direction B.

[0026] Countercurrent spraying creates countercurrent contact between atomized water droplets and exhaust gas, significantly increasing the relative velocity and contact path length between the gas and liquid phases. Compared with forward spraying, the treatment efficiency can be improved by 30%-50%. Furthermore, countercurrent spraying creates a larger concentration gradient difference, allowing odorous substances in the exhaust gas to be transferred from the gas phase to the liquid phase more efficiently, thereby being absorbed or removed by reaction. At the same time, by increasing the contact area and contact time between atomized water droplets and exhaust gas, the high removal efficiency of the device for odorous pollutants is fundamentally guaranteed.

[0027] The pipe body 1 is tilted, with end A in the first direction lower than end B in the second direction. This increases the contact area and contact time between the atomized water droplets and the exhaust gas as it flows from end A to end B. The tilted pipe forces the exhaust gas to flow upward against the slope, while the sprayed water droplets flow downward, further increasing the relative velocity difference between the gas and liquid, enhancing turbulence and mixing, and making the contact more thorough. At the same time, it helps the washed-down solid particles and larger droplets to settle naturally downward under gravity, making them easier to collect and preventing them from being carried out again by the airflow.

[0028] The circulating spray assembly 2 includes multiple spray heads 21, all connected inside the pipe body 1. The spray heads 21 atomize water droplets in the opposite direction to the exhaust gas flow, dividing the entire washing process into multiple treatment stages. Each stage treats pollutants of different concentrations, achieving gradient purification with a much higher efficiency than single-point spraying. Furthermore, the multiple spray points ensure uniform distribution of water droplets across the pipe cross-section, avoiding airflow short-circuiting or treatment blind spots.

[0029] The circulating spray assembly 2 also includes multiple first water receiving tanks 22, which are all located inside the pipe body 1. Spray wastewater flows into the first water receiving tanks 22 by its own gravity.

[0030] Specifically, the number of spray heads 21 and the number of first water receiving tanks 22 are the same, and each first water receiving tank 22 is located at the first direction A end of its adjacent spray head 21. The spray wastewater generated by each spray head 21 can be immediately collected by the water receiving tank at its first direction A end, preventing the spray wastewater from being carried forward by the airflow and affecting the washing effect of the next stage of spraying.

[0031] The spray head 21 at the second direction B end is connected to a water inlet pipe 24. The spray head 21 at the second direction B end is connected to an external water source through the water inlet pipe 24. All spray heads 21 except the spray head 21 at the second direction B end are connected to a connecting pipe 23. All spray heads 21 except the spray head 21 at the second direction B end are connected to the first water receiving tank 22 adjacent to the second direction B end through the connecting pipe 23. The first water receiving tank 22 at the first direction A end is connected to a first drain pipe 25. The first water receiving tank 22 at the first direction A end is connected to an external sewage tank through the first drain pipe 25. Except for the spray head 21 at the second direction B end which uses clean water, all other spray heads 21 use wastewater collected from the previous stage. This greatly reduces the consumption of fresh water and the amount of wastewater to be treated.

[0032] Preferably, a water pump is connected to the water inlet pipe 24. The water pump delivers purified water from an external water source to the spray head 21 at the second direction B end through the water inlet pipe 24. In other embodiments of this utility model, the purified water from the external water source can be delivered to the spray head 21 at the second direction B end by gravity or other means.

[0033] Preferably, a water pump is connected to the first drain pipe 25. The water pump transports the wastewater in the first water receiving tank 22 at the first end of the first direction A to the external sewage tank through the first drain pipe 25. In other embodiments of this utility model, the wastewater in the first water receiving tank 22 at the first end of the first direction A can be transported to the external sewage tank by gravity or other conditions, or other methods can be selected for transportation.

[0034] The exhaust gas at end A in the first direction of pipe body 1 is high-concentration exhaust gas, the exhaust gas in the middle of pipe body 1 is medium-concentration exhaust gas, the exhaust gas at end B in the second direction of pipe body 1 is low-concentration exhaust gas, the spray head 21 at end B in the second direction sprays clean water, the spray head 21 in the middle sprays moderately polluted water, and the spray head 21 at end A in the first direction sprays highly polluted water.

[0035] Preferably, there are four spray heads 21 and four first water receiving tanks 22. The four spray heads 21 are arranged sequentially from the second direction B to the first direction A as spray head A, spray head B, spray head C, and spray head D. The four first water receiving tanks 22 are arranged sequentially from the second direction B to the first direction A as first water receiving tank A, first water receiving tank B, first water receiving tank C, and first water receiving tank D. Clean water from an external water source is sprayed out through spray head A to wash the low-concentration exhaust gas. The moderately polluted water after washing the low-concentration exhaust gas flows into the first water receiving tank A. The first water receiving tank A transports the moderately polluted water to spray head B through connecting pipe 23. Spray head B sprays the moderately polluted water to wash the medium-concentration exhaust gas. The moderately polluted water after washing the medium-concentration exhaust gas flows into the first water receiving tank B. The first water receiving tank B delivers moderately polluted water to the spray head C via the connecting pipe 23. The spray head C sprays the moderately polluted water to wash the medium-concentration exhaust gas. After washing the medium-concentration exhaust gas, the highly polluted water flows back into the first water receiving tank C. The first water receiving tank C delivers the highly polluted water to the spray head D via the connecting pipe 23. The spray head D sprays the highly polluted water to wash the high-concentration exhaust gas. After washing the high-concentration exhaust gas, the highly polluted water flows back into the first water receiving tank D. The first water receiving tank D discharges the highly polluted water from the high-concentration exhaust gas into the sewage tank via the first drain pipe 25. In other embodiments of this utility model, the number of spray heads 21 and the first water receiving tank 22 may also be different.

[0036] Preferably, each connecting pipe 23 is connected to a water pump, and the water pump transports water from the first water receiving tank (excluding the first end A in the first direction) to the spray head 21 through the connecting pipe 23. In other embodiments of this utility model, the water in the first water receiving tank (excluding the first end A in the first direction) can be transported to the spray head 21 by gravity or other conditions, or other methods can be selected for transportation.

[0037] Pure water is added from end B, the second direction with the lowest pollution concentration, and circulated to end A, the first direction with the highest concentration. This allows the most polluted wastewater to be used to treat the most polluted exhaust gas, while the clean water is used for final fine treatment, which conforms to the purification logic and results in high overall purification efficiency.

[0038] A condensing component 3 is provided at the first direction A end of the pipe body 1. The condensing component 3 cools the exhaust gas entering the pipe body 1, causing the water vapor in the exhaust gas to condense and form condensate. Then, the remaining exhaust gas is sprayed and washed by the circulating spray component 2. By reducing humidity, the main load is reduced. High-temperature exhaust gas usually contains a large amount of water vapor. Cooling it down by condensation can significantly reduce the absolute humidity of the exhaust gas. Condensation itself is also a purification step, which can remove some water-soluble pollutants in the exhaust gas first, reducing the processing load of the subsequent spray washing component. At the same time, the exhaust gas with reduced temperature and humidity is more conducive to the treatment of odor substances by the washing water after entering the spray washing component.

[0039] A second water collection tank 32 is provided inside the pipe body 1. The second water collection tank 32 is located at the first direction A end of the condensation component 3 to collect condensate. A second drain pipe 33 is connected to the second water collection tank 32. The second water collection tank 32 is connected to an external sewage tank through the second drain pipe 33 to promptly remove condensate and prevent it from accumulating at the bottom of the device, affecting airflow distribution or causing equipment corrosion.

[0040] Preferably, a water pump is connected to the second drain pipe 33, and the water pump transports the condensate from the second water receiving tank 32 to the external sewage tank through the second drain pipe 33. In other embodiments of this utility model, the condensate from the second water receiving tank 32 can be transported to the external sewage tank by gravity or other conditions, or other methods can be selected for transportation.

[0041] In the first embodiment of the location of this deodorization treatment device, the deodorization treatment device is located before the tertiary treatment device and the combustion chamber. First, the sprayed exhaust gas is pretreated by this deodorization treatment device. Then, the pretreated exhaust gas is split. A portion of the pretreated exhaust gas, along with a portion of fresh air, enters the combustion chamber, where organic matter is completely decomposed by high-temperature oxidation. The remaining pretreated exhaust gas enters the tertiary treatment device for tertiary treatment.

[0042] In the second embodiment of the location of the deodorization treatment device, the deodorization treatment device is located after the tertiary treatment device. The exhaust gas after the tertiary treatment enters the deodorization treatment device for spray treatment. Then, the exhaust gas after spray treatment is diverted. A portion of the exhaust gas after spray treatment, together with a portion of fresh air, enters the combustion chamber. The organic matter is completely decomposed through high-temperature oxidation in the combustion chamber. The remaining exhaust gas after spray treatment is directly discharged.

[0043] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A spray-dried exhaust gas deodorization treatment device, characterized in that, The device includes a pipe body, with exhaust gas entering from the first directional end of the pipe body and flowing from the first directional end to the second directional end of the pipe body. A circulating spray assembly is provided inside the pipe body, which can spray atomized water droplets inside the pipe body to spray and wash the exhaust gas. The direction of the atomized water droplets sprayed by the circulating spray assembly is opposite to the flow direction of the exhaust gas to increase the contact area and contact time between the atomized water droplets and the exhaust gas.

2. The spray-dried exhaust gas deodorization treatment device according to claim 1, characterized in that, The pipe is tilted, with the first end of the pipe lower than the second end, so that when the exhaust gas flows from the first end to the second end of the pipe, the contact area and contact time between the atomized water droplets and the exhaust gas are further increased.

3. The spray-dried exhaust gas deodorization treatment device according to claim 1, characterized in that, The circulating spray assembly includes multiple spray heads, all of which are connected to the pipe body. The direction of the atomized water droplets sprayed by the multiple spray heads is opposite to the direction of the exhaust gas flow.

4. The spray-dried exhaust gas deodorization treatment device according to claim 3, characterized in that, The circulating spray assembly also includes multiple first water receiving tanks, all of which are located inside the pipe. Spray wastewater flows into the first water receiving tanks by its own gravity.

5. The spray-dried exhaust gas deodorization treatment device according to claim 4, characterized in that, The number of spray heads and the number of first water receiving tanks are the same, and each first water receiving tank is located at the first direction end of its adjacent spray head.

6. The spray-dried exhaust gas deodorization treatment device according to claim 4, characterized in that, The spray head at the second direction end is connected to a water inlet pipe, and the spray head at the second direction end is connected to an external water source through the water inlet pipe. All spray heads except the spray head at the second direction end are connected to a connecting pipe, and the spray heads except the spray head at the second direction end are connected to the first water receiving tank adjacent to the second direction end through the connecting pipe.

7. The spray-dried exhaust gas deodorization treatment device according to claim 6, characterized in that, A first drain pipe is connected to the first water receiving tank at the first directional end, and the first water receiving tank at the first directional end is connected to an external sewage tank through the first drain pipe.

8. The spray-dried exhaust gas deodorization treatment device according to claim 1, characterized in that, A condensation component is provided at the first directional end of the pipe body. The condensation component cools the exhaust gas entering the pipe body, causing the water vapor in the exhaust gas to condense and form condensate. Subsequently, the remaining exhaust gas is sprayed and washed by the circulating spray component.

9. The spray-dried exhaust gas deodorization treatment device according to claim 8, characterized in that, A second water collection tank is provided inside the pipe, located at the first direction end of the condenser assembly, to collect condensate.

10. The spray-dried exhaust gas deodorization treatment device according to claim 9, characterized in that, The second water inlet is connected to the second drain pipe, and the second water inlet is connected to the external sewage tank through the second drain pipe.

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