Waste gas treatment system of reconstituted tobacco sewage treatment station

Abstract

The invention relates to the technical field of waste gas treatment, and provides a reconstituted tobacco sewage treatment station waste gas treatment system which comprises a waste gas collection module, a waste gas automatic detection and analysis module, a waste gas treatment system and a regulation and control system. The waste gas collecting module comprises a plurality of waste gas collecting covers; the plurality of waste gas collecting covers are respectively arranged on all treatment ponds of the sewage treatment station; the waste gas automatic detection and analysis module comprises an analysis probe; the analysis probe is mounted in the waste gas conveying pipeline; the waste treatment system comprises a pretreatment unit and a core treatment unit, the pretreatment unit comprises an absorbent tank; the core treatment unit comprises a spray washing tower, a circulating water tank and a dosing pool; a gas inlet of the spray washing tower is connected with a waste gas conveying pipeline; a first liquid inlet of the spray washing tower is connected with the circulating water tank; and a second liquid inlet of the spray washing tower is connected with the dosing tank. The waste gas treatment device can ensure stable and efficient waste gas treatment effect.

Description

Technical Field

[0001] The invention relates to the technical field of waste gas treatment, and in particular to a waste gas treatment system for a reconstituted tobacco wastewater treatment station. Background Art

[0002] A large amount of wastewater is generated during the production of reconstituted tobacco leaves, and wastewater treatment plants often emit waste gas when treating this wastewater. These waste gases contain harmful substances such as H2S, CO, CO2, nitrogen, methane, mercaptan, sulfide gases, etc. Most of these gases pose a threat to the environment and human health.

[0003] In addition, due to the large amount of wastewater generated during the production process, a large amount of toxic and harmful gases will circulate in the air during the aeration treatment. If not handled in time, it will have a certain impact on the health of sewage station workers and surrounding residents.

[0004] The current waste gas treatment systems of sewage treatment plants mainly include biological treatment systems, photocatalytic oxidation systems, chemical absorption towers, condensation treatment, activated carbon adsorption, etc. However, at present, the treatment of waste gas from recycled tobacco wastewater treatment plants is relatively simple. The large amount of wastewater leads to a large amount of waste gas, resulting in high treatment costs. Therefore, it is urgent to combine multiple system designs to provide a targeted treatment solution for waste gas treatment in recycled tobacco wastewater treatment plants. Summary of the invention

[0005] The present invention mainly solves the technical problems of the prior art such as lack of pertinence, relatively single treatment method and high treatment cost, and proposes a waste gas treatment system for a recycled tobacco wastewater treatment station to ensure stable and efficient waste gas treatment effect.

[0006] The present invention provides a waste gas treatment system for a reconstituted tobacco wastewater treatment station, comprising: a waste gas collection module, a waste gas automatic detection and analysis module, a waste treatment system and a control system;

[0007] The waste gas collection module includes: a plurality of waste gas collection hoods; the plurality of waste gas collection hoods are respectively installed on each treatment tank of the sewage treatment station; each waste gas collection hood is connected to the waste treatment system through a waste gas delivery pipeline;

[0008] The exhaust gas automatic detection and analysis module includes: an analysis probe; the analysis probe is installed in the exhaust gas delivery pipeline; the analysis probe is connected to the control system signal;

[0009] The waste treatment system comprises: a pre-treatment unit and a core treatment unit;

[0010] The pretreatment unit comprises: an absorbent tank; the absorbent tank is connected to the exhaust gas delivery pipeline;

[0011] The core processing unit includes: a spray scrubber, a circulating water tank and a dosing tank;

[0012] The gas inlet of the spray scrubber is connected to the exhaust gas delivery pipeline; the first liquid inlet of the spray scrubber is connected to the circulating water tank, and a first automatic valve is provided on the connecting pipeline between the spray scrubber and the circulating water tank; the second liquid inlet of the spray scrubber is connected to the dosing tank, and a second automatic valve is provided on the connecting pipeline between the spray scrubber and the dosing tank;

[0013] The control system is respectively connected to the first automatic valve and the second automatic valve signal.

[0014] Preferably, a blower is provided on the exhaust gas conveying pipeline.

[0015] Preferably, a third automatic valve is provided on the connecting pipe between the absorbent tank and the exhaust gas delivery pipe;

[0016] The control system is connected to the third automatic valve signal.

[0017] Preferably, the absorbent tank contains an absorbent solution.

[0018] Preferably, a water pump is provided on the circulating water tank.

[0019] Preferably, the gas inlet of the spray scrubber is located at the bottom of the spray scrubber;

[0020] Multiple layers of nozzles are arranged in the spray washing tower.

[0021] Preferably, the core processing unit further comprises: a biological deodorization reactor;

[0022] The gas outlet of the spray scrubber is connected to the biological deodorization reactor.

[0023] Preferably, the biological deodorization reactor comprises: a circulating water washing section and a biological treatment section;

[0024] The circulating water washing section is located above the biological treatment section, and the circulating water washing section has a plurality of circulating water washing spray heads.

[0025] Preferably, an activated carbon adsorption box is arranged after the biological deodorization reactor.

[0026] Preferably, the activated carbon adsorption box is connected to the exhaust system;

[0027] The exhaust system comprises: a centrifugal fan and an exhaust chimney;

[0028] The activated carbon adsorption box is connected to a centrifugal fan, and the centrifugal fan is connected to an exhaust chimney;

[0029] A gas emission detector is arranged on the emission chimney; and the control system is connected with the gas emission detector by signal.

[0030] The waste gas treatment system of a recycled tobacco wastewater treatment station provided by the present invention adopts a combination of multiple technologies, including activated carbon adsorption, biological treatment, chemical reagent absorption, and condensed water condensation method treatment to ensure stable and efficient waste gas treatment effect; at the same time, the automation module can greatly reduce the difficulty of maintenance; greatly reduce the system operation cost, and the combination of multiple treatment methods can make the waste gas treatment stable, and also has a high degree of safety and environmental protection. The implementation of the present invention will help improve the environmental quality around the recycled tobacco wastewater treatment station and protect the ecological environment and human health. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the composition of the waste gas treatment system of the reconstituted tobacco wastewater treatment station provided by the present invention;

[0032] Figure 2 It is a schematic structural diagram of the biological deodorization reactor provided by the present invention.

[0033] Figure numerals: 1. Waste gas collection hood; 2. Blower; 3. Analysis probe; 4. Control system; 5. Absorbent tank; 6. Spray washing tower; 7. Circulating water tank; 8. Dosing tank; 9. Circulating water washing section; 10. Circulating water washing spray head; 11. Biological deodorization reactor; 12. Activated carbon adsorption box; 13. Centrifugal fan; 14. Gas emission detection valve; 15. Emission chimney; 16. Water pump; 17. Waste gas inlet; 18. First liquid inlet; 19. Second liquid inlet; 20. Gas outlet of spray washing tower; 21. Biological treatment section. DETAILED DESCRIPTION

[0034] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all the contents.

[0035] like Figure 1-2 As shown, an embodiment of the present invention provides a waste gas treatment system for a recycled tobacco wastewater treatment station, comprising: a waste gas collection module, a waste gas automatic detection and analysis module, a waste treatment system and a control system 4.

[0036] The waste gas collection module includes: a plurality of waste gas collection hoods 1; the plurality of waste gas collection hoods 1 are respectively installed on each treatment tank (such as a primary sedimentation tank, a secondary sedimentation tank, a hydrolysis acidification tank, a flotation tank, an OA tank, etc.) of a sewage treatment station; each waste gas collection hood 1 is connected to a waste treatment system through a waste gas delivery pipeline. A blower 2 is arranged on the waste gas delivery pipeline.

[0037] The exhaust gas automatic detection and analysis module includes: an analysis probe 3; the analysis probe 3 is installed in the exhaust gas delivery pipeline; the analysis probe 3 is signal-connected to the control system 4. The control system 4 mainly automatically analyzes and processes the gas composition and concentration of each delivery pipeline through a processor.

[0038] Due to the particularity of the reconstituted tobacco production process, the main toxic and harmful gases produced include sulfur-containing gas (H2S), carbon monoxide, carbon dioxide and nitrogen (harmless but mainly causing suffocation and decompression sickness, etc.), so H2S detection, CO detection and nitrogen detection can be mainly performed for different pools. Therefore, if the analysis probe 3 adopts the Honeywell ImpactPro series, multi-gas detection can be achieved, and sensors such as hydrogen sulfide and carbon dioxide can be configured according to actual needs to achieve gas detection.

[0039] H2S can be detected by Honeywell's 4H2S-100 hydrogen sulfide sensor, whose detection principle is based on electrochemical technology. Specifically, when hydrogen sulfide gas contacts the electrodes in the sensor, an electrochemical redox reaction occurs, thereby generating a current signal proportional to the concentration of hydrogen sulfide. By measuring the magnitude of this current, the sensor can accurately measure the concentration of hydrogen sulfide. The main detection principle of CO, CO2 and nitrogen is the electrochemical method. Electrochemical sensors are commonly used on the market. Different gases can be detected by different sensors. For example, CO can use Honeywell 7CO-1000 electrochemical sensor, CO2 can use Honeywell C8000D001 electrochemical sensor, and nitrogen can use Honeywell MIDAS-E-NH3 electrochemical sensor. The gas concentration is detected by measuring the current generated by the gas reaction on the electrode.

[0040] The waste treatment system includes: a pretreatment unit and a core treatment unit. The pretreatment unit performs preliminary treatment on the waste gas, and can absorb a small amount of waste gas, cool it down, remove dust, etc. The core treatment unit combines a variety of technologies such as spray scrubber separation technology, activated carbon adsorption and biological deodorization technology to perform deep treatment on the waste gas.

[0041] The pretreatment unit includes: an absorbent tank 5; the absorbent tank 5 is connected to the exhaust gas delivery pipeline; the absorbent tank 5 contains an absorbent solution, and the concentration of the added solution can be automatically set by the control system according to the different concentrations transmitted by the sensor. The pipes coming out of different treatment tanks contain different absorption liquids according to the different exhaust gases that are mainly pretreated. For example, the main absorption solution of the exhaust gas extracted from the hydrolysis acidification tank is FeCl3 solution, and FeCl3 solution is used to absorb H2S produced in the hydrolysis acidification tank. The absorbent tank 5 uses FeCl3 solution to absorb H2S for pretreatment; the reaction ion equation is: 2Fe 3+ +H2S=S↓+2Fe 2+ +2H + The principle is that trivalent iron ions have strong oxidizing properties and can oxidize H2S to generate sulfur, while they themselves are reduced to divalent iron ions.

[0042] The absorbent solution of the present invention can select an alkali solution (such as sodium hydroxide, potassium hydroxide, etc.) to absorb CO2. Taking sodium hydroxide as an example, the alkali solution that absorbs CO2 is the absorbent at the exhaust gas suction port of the OA pool, and its reaction equation is: 2NAOH+CO2+H2O→NACO3+H2O. This reaction can efficiently remove CO2. The nitrogen content is generally low, and it can be absorbed together with CO in the core processing unit. CO can be absorbed by spray water and biological treatment section in the spray tower, and nitrogen can be treated by activated carbon, molecular sieve, etc.

[0043] A third automatic valve is arranged on the connecting pipe between the absorbent tank 5 and the exhaust gas delivery pipe; the control system is connected to the third automatic valve signal, and the opening and closing of the absorbent tank 5 and the liquid supply amount are adjusted by the third automatic valve.

[0044] The core processing unit includes: a spray washing tower 6, a circulating water tank 7 and a dosing tank 8.

[0045] The gas inlet 17 of the spray scrubber 6 is connected to the exhaust gas delivery pipeline; the first liquid inlet 18 of the spray scrubber 6 is connected to the circulating water tank 7, and a first automatic valve is provided on the connecting pipeline between the spray scrubber 6 and the circulating water tank 7; a water pump 16 is provided on the circulating water tank 7. The second liquid inlet 19 of the spray scrubber 6 is connected to the dosing tank 8, and a second automatic valve is provided on the connecting pipeline between the spray scrubber 6 and the dosing tank 8; the control system is respectively connected to the first automatic valve and the second automatic valve signal.

[0046] The gas inlet 17 of the spray scrubber 6 is located at the bottom of the spray scrubber 6; a spray system is arranged in the spray scrubber 6, including multi-layer nozzles, spray pipes, a demisting device, an inspection port, and a packing layer. The spray scrubber 6 mainly uses alkali solution, water and an oxidant to absorb and treat the waste gas. The alkali solution can neutralize the acidic gas to absorb the waste gas, the water can remove some soluble pollutants in the waste gas by physical adsorption, and the oxidant can significantly improve the removal effect of the spray scrubber on the difficult-to-degrade pollutants in the waste gas, making the purified gas cleaner. For example: alkali solution absorption, the alkali solution reacts with hydrogen sulfide to produce corresponding sulfide and water. Taking sodium hydroxide as an example, the reaction equation is: H2S+2NaOH→Na2S+2H2O. Oxidant absorption is usually oxidized to sulfur element or sulfate. Taking hypochlorous acid as an example, H2S+NaOCL→S↓+NACL+H2O. CO2 and nitrogen can be partially absorbed and treated by water and oxidant, and then reprocessed by the biological treatment section 21 and the activated carbon adsorption box 12.

[0047] The core processing unit further includes: a biological deodorization reactor 11 ; and the gas outlet 20 of the spray scrubber 6 is connected to the biological deodorization reactor 11 .

[0048] The biological deodorization reactor 11 includes: a circulating water washing section 9 and a biological treatment section 21; the circulating water washing section 9 is located above the biological treatment section 21, and the circulating water washing section 9 has a plurality of circulating water washing spray heads 10; the biological deodorization reactor 11 also uses alkali solution, water and oxidant to absorb H2S, and the circulating water washing spray heads 10 spray alkali solution, water and oxidant. The biological treatment section 21 has a biological filter, a packing layer, a microbial community, an air distribution system, and a drainage system; an activated carbon adsorption box 12 is arranged after the biological deodorization reactor 11.

[0049] Furthermore, the activated carbon adsorption box 12 is connected to the emission system. The emission system includes: a centrifugal fan 13 and an emission chimney 15; the activated carbon adsorption box 12 is connected to the centrifugal fan 13, and the centrifugal fan 13 is connected to the emission chimney 15; a gas emission detector 14 is arranged on the emission chimney 15, such as Honeywell PGM-2680 four-in-one gas detection analyzer; the control system is connected to the gas emission detector 14 by signal. The emission system discharges the treated waste gas into the atmosphere through the emission chimney 15 after the self-inspection meets the standard.

[0050] The working process of the waste gas treatment system of a recycled tobacco wastewater treatment station of the present invention is as follows:

[0051] The waste gas in the sewage pool covered with the waste gas collection cover 1 is transported into the waste gas conveying pipeline through the blower 2, and the gas composition and concentration in each pool are analyzed by the analysis probe 3 on the waste gas conveying pipeline. According to different gases and concentrations, the control system 4 automatically adjusts the concentration of the absorbent solution in the absorbent tank 5 and the dosage of the alkali solution in the dosing tank 8 in the spray washing tower 6. The dosage is mainly controlled by the data transmitted after detection by the analysis probe 3 and processed and output by the control system; the pretreatment operation in the absorbent tank 5 enters the core processing unit after preliminary dosing and absorption treatment. In the core treatment unit, the waste gas is firstly treated by the separation technology of the spray washing tower 6, and the liquid supply of the circulating water tank 7 and the dosing tank 8 is automatically analyzed and controlled to remove the suspended particulate matter and water-soluble H2S gas components in the waste gas, and then it enters the circulating water washing section 9, and the circulating water washing spray head 10 absorbs the alkali solution entrained with the air flow through the spray system, so as to create a favorable biological environment for the biological treatment section 21 of the biological deodorization reactor 11, and then the biological treatment section 21 degrades the organic matter in the waste gas through the biochemical action of microorganisms, and decomposes the pollutants; finally, after adsorption treatment by the activated carbon adsorption box 12, it is sucked by the centrifugal fan 13, and after passing through the gas emission detection valve 14, it is ensured that the waste gas meets the emission standards, and then the gas is discharged through the emission chimney 15 to achieve the waste gas treatment effect.

[0052] Among them, the automatic control process of the control system 4: when the analysis probe 3 detects different gas concentrations in different treatment pools, among them, if the H2S content in the hydrolysis acidification pool is high, it can be mainly treated, and if the CO, CO2 and nitrogen in the OA pool are high, they can be mainly treated in the OA pool. When the detection result reaches a certain system value set in the system, the system will automatically correspond to the gear of the concentration, and the PLC will output instructions, which can be divided into three gears: low, medium and high. At low gear, the pretreatment dosing absorption is small and the spraying effect of the spray washing tower 6 is relatively low. Similarly, at high gear, the pretreatment dosing absorption is large and the spraying effect of the spray washing tower 6 is relatively good.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that modifying the technical solutions described in the aforementioned embodiments, or replacing some or all of the technical features therein by equivalents, does not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A waste gas treatment system for a recycled tobacco wastewater treatment station, characterized in that: include: Waste gas collection module, waste gas automatic detection and analysis module, waste treatment system and control system (4); The waste gas collection module comprises: a plurality of waste gas collection covers (1); the plurality of waste gas collection covers (1) are respectively installed on each treatment tank of the sewage treatment station; each waste gas collection cover (1) is connected to the waste treatment system through a waste gas conveying pipeline; The exhaust gas automatic detection and analysis module comprises: an analysis probe (3); the analysis probe (3) is installed in the exhaust gas conveying pipeline; the analysis probe (3) is connected to the control system (4) by signal; The waste treatment system comprises: a pre-treatment unit and a core treatment unit; The pretreatment unit comprises: an absorbent tank (5); the absorbent tank (5) is connected to the exhaust gas conveying pipeline; The core processing unit comprises: a spray washing tower (6), a circulating water tank (7) and a dosing tank (8); The gas inlet (17) of the spray scrubber (6) is connected to the waste gas delivery pipeline; the first liquid inlet (18) of the spray scrubber (6) is connected to the circulating water tank (7), and a first automatic valve is provided on the connecting pipeline between the spray scrubber (6) and the circulating water tank (7); the second liquid inlet (19) of the spray scrubber (6) is connected to the dosing tank (8), and a second automatic valve is provided on the connecting pipeline between the spray scrubber (6) and the dosing tank (8); The control system (4) is respectively connected to the first automatic valve and the second automatic valve by signal.

2. The waste gas treatment system of recycled tobacco wastewater treatment station according to claim 1 is characterized in that: A blower (2) is arranged on the waste gas conveying pipeline.

3. The waste gas treatment system of recycled tobacco wastewater treatment station according to claim 1, characterized in that: A third automatic valve is provided on the connecting pipe between the absorbent tank (5) and the exhaust gas delivery pipe; The control system (4) is connected to the third automatic valve signal.

4. The waste gas treatment system of recycled tobacco wastewater treatment station according to claim 3 is characterized in that: The absorbent tank (5) contains an absorbent solution.

5. The waste gas treatment system of recycled tobacco wastewater treatment station according to claim 1, characterized in that: A water pump (16) is provided on the circulating water tank (7).

6. The waste gas treatment system of recycled tobacco wastewater treatment station according to claim 1, characterized in that: The gas inlet (17) of the spray scrubbing tower (6) is located at the bottom of the spray scrubbing tower (6); Multiple layers of nozzles are arranged in the spray washing tower (6).

7. The waste gas treatment system of recycled tobacco wastewater treatment station according to claim 1, characterized in that: The core processing unit further comprises: a biological deodorization reactor (11); The gas outlet (20) of the spray scrubbing tower (6) is connected to the biological deodorization reactor (11).

8. The waste gas treatment system of recycled tobacco wastewater treatment station according to claim 7, characterized in that: The biological deodorization reactor (11) comprises: a circulating water washing section (9) and a biological treatment section (21); The circulating water washing section (9) is located above the biological treatment section (21), and the circulating water washing section (9) has a plurality of circulating water washing spray heads (10).

9. The waste gas treatment system of recycled tobacco wastewater treatment station according to claim 8, characterized in that: An activated carbon adsorption box (12) is arranged after the biological deodorization reactor (11).

10. The waste gas treatment system of recycled tobacco wastewater treatment station according to claim 9, characterized in that: The activated carbon adsorption box (12) is connected to the exhaust system; The exhaust system comprises: a centrifugal fan (13) and an exhaust chimney (15); The activated carbon adsorption box (12) is connected to a centrifugal fan (13), and the centrifugal fan (13) is connected to an exhaust chimney (15); A gas emission detector (14) is arranged on the emission chimney (15); and the control system (4) is connected to the gas emission detector (14) by signals.

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