Online continuous ammonia removal system for fermenter exhaust gas

Abstract

This invention provides an online continuous ammonia removal system for fermenter tail gas, including a fermenter, an absorption tank, a gas scrubbing tank, and a collection tank. The fermenter is connected to the absorption tank via a pneumatic diaphragm valve for the fermenter tail gas, and the absorption tank is connected to the collection tank via a pneumatic diaphragm valve for the absorption tank material outlet. An ammonia sensor is installed at the tail gas outlet of the absorption tank, and the tail gas outlet is connected to the tail gas discharge pipeline via a pneumatic diaphragm valve. The tail gas outlet of the absorption tank is connected to the inlet pipeline of the gas scrubbing tank, and the gas scrubbing tank is connected to the collection tank. This invention utilizes the physicochemical property that ammonia is highly soluble in water to absorb ammonia from the tail gas using low-cost water. While maintaining convenience and low cost, it can achieve thorough ammonia treatment. Furthermore, by connecting the absorption tank and the gas scrubbing tank in series to the collection tank, the ammonia water in the absorption tank can neutralize the acidic waste liquid in the collection tank, enabling the reuse of the absorbent liquid.

Description

Technical Field

[0001] This utility model relates to the field of microbial fermentation pharmaceutical technology, specifically to an online continuous ammonia removal system for fermenter tail gas. Background Technology

[0002] In the microbial fermentation pharmaceutical industry, microorganisms obtain energy by breaking down substrates (such as sugars and starches) in fermenters. During metabolism, they produce target primary and secondary metabolites. Processes such as glycolysis (EMP pathway), pentose phosphate pathway (HMP pathway), and the tricarboxylic acid cycle (TCA cycle) continuously produce acid, lowering the pH of the fermentation broth and limiting microbial growth. To maintain efficient microbial metabolism, ammonia is continuously added to the fermenter during fermentation to raise the pH and maintain the microorganisms in the optimal pH environment for growth.

[0003] Ammonia is the best fast-acting nitrogen source and pH adjuster for microbial fermentation, but it is highly volatile, resulting in a certain concentration of ammonia in the exhaust gas of the fermenter. In continuous large-scale production, it is crucial to protect the environment by absorbing ammonia from the exhaust gas of the fermenter at low cost and continuously.

[0004] Patent document CN213556307U discloses a fermenter exhaust gas treatment system, which includes a fermenter, a carbon dioxide purification device, an exhaust gas treatment tank, and a photobioreactor. The fermenter has an exhaust gas pipe at its top, connecting it to the carbon dioxide purification device. The exhaust gas pipe is sequentially equipped with a condenser, a heater, and a sterilization filter. The carbon dioxide purification device is connected to the photobioreactor via a gas pump. The top of the carbon dioxide purification device has an exhaust gas outlet pipe, connecting it to the exhaust gas treatment tank. This system enables efficient utilization of carbon dioxide resources. However, the exhaust gas absorption device cannot completely absorb and treat the exhaust gas. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide an online continuous ammonia removal system for fermenter tail gas.

[0006] The online continuous ammonia removal system for fermenter tail gas provided by this utility model includes a fermenter, an absorption tank, a gas washing tank, and a collection tank.

[0007] The fermenter tail gas outlet is connected to the absorption tank inlet pipe of the absorption tank through the fermenter tail gas pneumatic diaphragm valve. After the tail gas in the fermenter enters the absorption tank, the ammonia in the tail gas is absorbed by the water in the absorption tank to form absorption liquid and absorption tank tail gas.

[0008] The absorber tank material outlet pipeline of the absorber tank is connected to the collection tank material inlet of the collection tank through the absorber tank material outlet pneumatic diaphragm valve. The collection tank is used to collect the absorbent liquid in the absorber tank.

[0009] The absorption tank is equipped with an ammonia gas sensor at the tail gas outlet of the absorption tank to detect whether ammonia gas is present in the tail gas of the absorption tank.

[0010] The exhaust gas outlet of the absorption tank is connected to the exhaust gas discharge pipeline of the absorption tank through the pneumatic diaphragm valve of the absorption tank exhaust gas discharge. When there is no ammonia in the exhaust gas of the absorption tank, it is discharged to the outside through the exhaust gas discharge pipeline of the absorption tank.

[0011] The exhaust gas outlet of the absorption tank is connected to the inlet pipeline of the washing tank through the exhaust gas to the washing tank pipeline. The exhaust gas to the washing tank pipeline is equipped with a pneumatic diaphragm valve. When there is ammonia in the exhaust gas of the absorption tank, it enters the washing tank through the inlet of the washing tank and is absorbed by the acid in the washing tank to form a neutralized liquid.

[0012] The material outlet pipeline of the gas washing tank is connected to the material inlet of the collection tank through the gas washing tank material outlet pneumatic diaphragm valve. The collection tank is used to collect the neutralized liquid in the gas washing tank.

[0013] Preferably, the absorption tank is provided with an absorption tank vent, which is connected to the absorption tank inlet pipeline through an absorption tank inlet pneumatic diaphragm valve.

[0014] An agitator is installed at the bottom of the absorption tank;

[0015] The absorption tank is fitted with a cooling jacket, which has an absorption tank jacket cooling water inlet and an absorption tank jacket cooling water outlet. An absorption tank temperature sensor is installed inside the absorption tank.

[0016] Preferably, the absorption tank is equipped with a pressure transmitter on its side wall and a pH electrode is installed inside the absorption tank to detect the pH value of the absorption liquid.

[0017] A check valve for the exhaust gas from the absorption tank to the scrubbing tank is installed on the pipeline of the absorption tank exhaust gas to the scrubbing tank. The check valve for the exhaust gas from the absorption tank to the scrubbing tank is located downstream of the pneumatic diaphragm valve of the absorption tank exhaust gas to the scrubbing tank.

[0018] A material outlet check valve is installed on the material outlet pipeline of the absorption tank, and the material outlet check valve is located downstream of the material outlet pneumatic diaphragm valve of the absorption tank.

[0019] Preferably, it also includes a water tank and a PLC, wherein the water tank material outlet is connected to the absorption tank water inlet of the absorption tank through a water tank material outlet pneumatic diaphragm valve;

[0020] The absorber tank is equipped with a pneumatic diaphragm valve for water inlet, and a spray ball is installed at the top of the absorber tank, which is connected to the absorber tank inlet.

[0021] The absorption tank is equipped with a differential pressure level gauge on its side wall to detect the liquid level of the absorption liquid inside the absorption tank. The PLC is connected to the differential pressure level gauge and the pneumatic diaphragm valve for the water inlet of the absorption tank.

[0022] Preferably, the water tank is provided with a water tank replenishment inlet pipe, and the water tank replenishment inlet pipe is provided with a water tank replenishment pneumatic diaphragm valve;

[0023] The water tank is equipped with a water tank pressure transmitter, and the top of the water tank is provided with a water tank exhaust gas outlet.

[0024] Preferably, the gas washing tank is provided with a gas washing tank vent, and the gas washing tank vent is connected to the gas washing tank inlet pipeline through a gas washing tank inlet pneumatic diaphragm valve;

[0025] The bottom of the gas washing tank is equipped with a gas washing tank agitator;

[0026] The gas washing tank is fitted with a cooling jacket, which has a cooling water inlet and a cooling water outlet. A gas washing tank temperature sensor is installed inside the gas washing tank.

[0027] Preferably, the gas washing tank is equipped with a gas washing tank tail gas ammonia sensor at the gas washing tank tail gas outlet to detect whether there is ammonia in the gas washing tank tail gas.

[0028] The tail gas outlet of the gas washing tank is connected to the tail gas discharge pipeline of the gas washing tank through the gas washing tank tail gas discharge pneumatic diaphragm valve. When there is no ammonia in the tail gas of the gas washing tank, it is discharged to the outside through the tail gas discharge pipeline of the gas washing tank.

[0029] The tail gas outlet of the gas scrubbing tank is connected to the inlet pipeline of the absorption tank through the tail gas scrubbing tank to the absorption tank pipeline. A pneumatic diaphragm valve for the tail gas scrubbing tank to the absorption tank is installed on the tail gas scrubbing tank to the absorption tank pipeline. When there is ammonia in the tail gas scrubbing tank, it enters the absorption tank again through the inlet pipeline of the absorption tank.

[0030] The side wall of the gas washing tank is equipped with a gas washing tank pressure transmitter, and the inside of the gas washing tank is equipped with a gas washing tank pH electrode for detecting the pH value of the neutralization solution.

[0031] A check valve for the exhaust gas from the gas scrubbing tank to the absorption tank is installed on the pipeline from the gas scrubbing tank to the absorption tank. The check valve for the exhaust gas from the gas scrubbing tank to the absorption tank is located downstream of the pneumatic diaphragm valve for the exhaust gas from the gas scrubbing tank to the absorption tank.

[0032] A material outlet check valve is installed on the material outlet pipeline of the gas washing tank, and the material outlet check valve is located downstream of the pneumatic diaphragm valve of the gas washing tank.

[0033] Preferably, it also includes an acid tank and a PLC, wherein the acid tank material outlet of the acid tank is connected to the gas washing tank replenishment port of the gas washing tank through an acid tank material outlet pneumatic diaphragm valve;

[0034] The gas washing tank replenishment port is equipped with a gas washing tank acid inlet pneumatic diaphragm valve, and a gas washing tank spray ball is installed at the top inside the gas washing tank, which is connected to the gas washing tank replenishment port.

[0035] The side wall of the gas washing tank is equipped with a differential pressure level gauge for detecting the level of the neutralizing liquid inside the gas washing tank. The PLC is connected to the differential pressure level gauge and the acid inlet pneumatic diaphragm valve of the gas washing tank.

[0036] Preferably, the acid tank is provided with an acid tank replenishment inlet pipeline, and the acid tank replenishment inlet pipeline is provided with an acid tank replenishment pneumatic diaphragm valve;

[0037] An acid tank pressure transmitter is installed on the acid tank, and an acid tank exhaust gas outlet is provided on the top of the acid tank.

[0038] The bottom of the acid tank is equipped with an acid tank stirrer and an acid tank pH electrode, which is used to detect the pH value of the acid in the acid tank.

[0039] Preferably, a pneumatic diaphragm valve for material inlet of the collection tank is provided at the material inlet of the collection tank;

[0040] The top of the collection tank is equipped with a collection tank pressure transmitter and a collection tank exhaust gas outlet pipeline, the bottom of the collection tank is equipped with a collection tank agitator and a collection tank material outlet pipeline, and a collection tank material outlet pneumatic diaphragm valve is installed on the collection tank material outlet pipeline.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] This invention connects a fermenter, an absorption tank, and a gas scrubbing tank in series to perform a two-stage treatment of ammonia gas through water absorption and acid neutralization. Utilizing the physicochemical property that ammonia gas is highly soluble in water, it uses low-cost water to absorb ammonia gas from the exhaust gas. While maintaining convenience and low cost, it can achieve thorough treatment of ammonia gas, ensuring that the ammonia gas in the exhaust gas is completely absorbed. At the same time, by connecting the absorption tank and the gas scrubbing tank in series to a collection tank, the ammonia water in the absorption tank can be used to neutralize the acidic waste liquid in the collection tank, enabling the reuse of the absorption liquid. Attached Figure Description

[0043] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0044] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0045] The diagram shows:

[0046] Fermentation tank 100, gas scrubber tail gas discharge pneumatic diaphragm valve 309

[0047] Fermentation tank exhaust outlet 101; gas scrubbing tank exhaust pipe 310

[0048] 102 Pneumatic diaphragm valve for fermenter exhaust gas; 103 Pneumatic diaphragm valve for waste gas from gas scrubber to absorption tank; 311 Pneumatic check valve for fermenter exhaust gas.

[0049] Absorption tank 200, gas scrubbing tank exhaust gas to absorption tank check valve 312

[0050] Absorber inlet pipe 201; Washing tank material outlet check valve 313

[0051] Absorber vent 202, Wash tank jacket cooling water inlet 314

[0052] Absorber spray ball 203, gas scrubber jacket cooling water outlet 315

[0053] 204 pneumatic diaphragm valve for absorber inlet; 316 agitator for scrubbing tank.

[0054] Absorption tank inlet pneumatic diaphragm valve 205; air scrubber pH electrode 317

[0055] Absorption tank pressure transmitter 206; gas scrubber temperature sensor 318

[0056] Absorber tail gas outlet 207, gas scrubbing tank material outlet pneumatic diaphragm valve 319, absorber tail gas ammonia sensor 208, gas scrubbing tank material outlet pipeline 320

[0057] 209 Pneumatic diaphragm valve for exhaust gas from absorption tank; 321 Differential pressure level gauge for gas scrubbing tank.

[0058] Absorption tank exhaust pipe 210, collection tank 400

[0059] Absorption tank tail gas to scrubbing tank pneumatic diaphragm valve collection tank material inlet 401

[0060] 211 Material inlet pneumatic diaphragm valve for collection tank 402

[0061] 212 Check valve for exhaust gas from absorption tank to scrubbing tank; 403 Pressure transmitter for collection tank.

[0062] Absorption tank jacket cooling water inlet 213, collection tank exhaust gas outlet pipe 404

[0063] Absorption tank jacket cooling water outlet 214, collection tank agitator 405

[0064] Absorption tank agitator 215; Collection tank material outlet pneumatic diaphragm valve 406; Absorption tank pH electrode 216; Collection tank material outlet pipeline 407

[0065] Absorption tank temperature sensor 217, water tank 500

[0066] Absorption tank material outlet pneumatic diaphragm valve 218; water tank makeup water inlet pipeline 501

[0067] Absorption tank material outlet pipeline 219; water tank water inlet pneumatic diaphragm valve 502

[0068] 220 Check Valve for Material Outlet of Absorption Tank; 503 Pressure Transmitter for Water Tank

[0069] Pipeline 221 from the absorber exhaust to the scrubbing tank; water tank exhaust outlet 504

[0070] Absorption tank water inlet 222; Water tank material outlet pneumatic diaphragm valve 505

[0071] Differential pressure level gauge for absorption tank 223; material outlet of water tank 506

[0072] 300 cubic meters of gas scrubber and 600 cubic meters of acid tank

[0073] 301 air inlet pipe for gas scrubber; 601 acid replenishment inlet pipe for acid tank.

[0074] 302 Gas scrubber diffuser vent; 602 Acid tank acid replenishment and air inlet diaphragm valve; 303 Gas scrubber spray ball; 603 Acid tank pressure transmitter.

[0075] 304 pneumatic diaphragm valve for gas scrubber inlet; 604 stainless steel for acid tank exhaust outlet.

[0076] 305 acid washing tank inlet pneumatic diaphragm valve for acid; 605 acid tank agitator.

[0077] Gas scrubber pressure transmitter 306, acid tank pH electrode 606

[0078] 307 Gas scrubber tail gas outlet; 607 Acid tank material outlet pneumatic diaphragm valve; 308 Gas scrubber tail gas ammonia sensor; 608 Acid tank material outlet. Detailed Implementation

[0079] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0080] This utility model discloses an online continuous ammonia removal system for fermenter tail gas. It performs a two-stage treatment of ammonia gas through water absorption and acid neutralization. Taking advantage of the physicochemical property that ammonia gas is highly soluble in water, the ammonia gas in the tail gas is absorbed with low-cost water. While maintaining convenience and low cost, it can achieve thorough treatment of ammonia gas, ensuring that the ammonia gas in the tail gas is completely absorbed. At the same time, by connecting the absorption tank and the gas scrubbing tank in series to the collection tank, the ammonia water in the absorption tank can be used to neutralize the acidic waste liquid in the collection tank, realizing the reuse of the absorption liquid.

[0081] According to the online continuous ammonia removal system for fermenter tail gas provided by this utility model, such as Figure 1 As shown, the system includes a fermenter 100, an absorption tank 200, a gas washing tank 300, and a collection tank 400. The fermenter tail gas outlet 101 of the fermenter 100 is connected to the absorption tank inlet pipe 201 of the absorption tank 200 via a fermenter tail gas pneumatic diaphragm valve 102. After the tail gas in the fermenter 100 enters the absorption tank 200, the ammonia in the tail gas is absorbed by the water in the absorption tank 200, forming an absorbent liquid and the absorption tank tail gas. The absorption tank material outlet pipe 219 of the absorption tank 200 is connected to the collection tank material inlet 401 of the collection tank 400 via an absorption tank material outlet pneumatic diaphragm valve 218. The collection tank 400 is used to collect the absorbent liquid in the absorption tank 200. An absorption tank tail gas ammonia sensor 208 is installed on the absorption tank tail gas outlet 207 of the absorption tank 200 to detect whether ammonia is present in the absorption tank tail gas.

[0082] The exhaust outlet 207 of the absorption tank is connected to the exhaust pipe 210 of the absorption tank via the pneumatic diaphragm valve 209. When there is no ammonia in the exhaust gas of the absorption tank, it is discharged to the outside through the exhaust pipe 210. The exhaust outlet 207 of the absorption tank is connected to the inlet pipe 301 of the washing tank 300 via the exhaust gas to washing tank pipe 221. The exhaust gas to washing tank pipe 221 is equipped with a pneumatic diaphragm valve 211. When there is ammonia in the exhaust gas of the absorption tank, it enters the washing tank 300 through the inlet 301 and is absorbed by the acid in the washing tank 300 to form a neutralized liquid. By performing a two-stage treatment of ammonia by water absorption and acid neutralization, and taking advantage of the physicochemical property that ammonia is highly soluble in water, ammonia in the exhaust gas can be absorbed by low-cost water, thus achieving convenient and low-cost ammonia treatment.

[0083] The material outlet pipe 320 of the gas washing tank 300 is connected to the material inlet 401 of the collection tank 400 via a pneumatic diaphragm valve 319. The collection tank 400 is used to collect the neutralized liquid in the gas washing tank 300. In a preferred embodiment, a pneumatic diaphragm valve 402 is provided at the material inlet 401 of the collection tank; a pressure transmitter 403 and a tail gas outlet pipe 404 are provided at the top of the collection tank 400; a stirrer 405 and a material outlet pipe 407 are provided at the bottom of the collection tank 400; and a pneumatic diaphragm valve 406 is provided on the material outlet pipe 407.

[0084] In a preferred embodiment, the absorption tank 200 is provided with an absorption tank vent 202, which is connected to the absorption tank inlet pipe 201 via an absorption tank inlet pneumatic diaphragm valve 204; an absorption tank agitator 215 is installed at the bottom of the absorption tank 200; a cooling jacket is fitted around the absorption tank 200, with a cooling water inlet 213 and a cooling water outlet 214 provided on the cooling jacket; and an absorption tank temperature sensor 217 is installed inside the absorption tank 200. Through the cooperation of the absorption tank temperature sensor 217 and a PLC, the inlet and outlet of the cooling water can be adjusted in real time, thereby achieving closed-loop temperature control.

[0085] In more preferred embodiments, an absorption tank pressure transmitter 206 is provided on the side wall of the absorption tank 200, and an absorption tank pH electrode 216 is provided inside the absorption tank 200 for detecting the pH value of the absorption liquid; an absorption tank exhaust gas to scrubbing tank check valve 212 is provided on the absorption tank exhaust gas to scrubbing tank pipeline 221, and the absorption tank exhaust gas to scrubbing tank check valve 212 is located downstream of the absorption tank exhaust gas to scrubbing tank pneumatic diaphragm valve 211; an absorption tank material outlet check valve 220 is provided on the absorption tank material outlet pipeline 219, and the absorption tank material outlet check valve 220 is located downstream of the absorption tank material outlet pneumatic diaphragm valve 218. Real-time closed-loop control of exhaust gas entry and exit can be achieved through the cooperation of the absorption tank pressure transmitter 206, the absorption tank exhaust gas ammonia sensor 208, and the PLC.

[0086] In a preferred embodiment, the ammonia removal system further includes a water tank 500 and a PLC. The water tank material outlet 506 of the water tank 500 is connected to the absorption tank water inlet 222 of the absorption tank 200 via a water tank material outlet pneumatic diaphragm valve 505. The absorption tank water inlet 222 is equipped with an absorption tank inlet pneumatic diaphragm valve 205. An absorption tank spray ball 203 is installed at the top of the absorption tank 200 and is connected to the absorption tank water inlet 222. A differential pressure level gauge 223 is installed on the side wall of the absorption tank 200 to detect the liquid level of the absorbent inside the absorption tank 200. The PLC is connected to the absorption tank differential pressure level gauge 223 and the absorption tank inlet pneumatic diaphragm valve 205, thereby enabling real-time water replenishment and continuous treatment of the exhaust gas.

[0087] In more preferred embodiments, the water tank 500 is provided with a water tank water inlet pipe 501, and the water tank water inlet pipe 501 is provided with a water tank water inlet pneumatic diaphragm valve 502; the water tank 500 is equipped with a water tank pressure transmitter 503, and the top of the water tank 500 is provided with a water tank exhaust gas outlet 504.

[0088] In a preferred embodiment, the gas washing tank 300 is provided with a gas washing tank vent 302, which is connected to the gas washing tank inlet pipe 301 via a gas washing tank inlet pneumatic diaphragm valve 304. A gas washing tank agitator 316 is installed at the bottom of the gas washing tank 300. A cooling jacket is fitted around the gas washing tank 300, with a cooling water inlet 314 and a cooling water outlet 315. A gas washing tank temperature sensor 318 is installed inside the gas washing tank 300. Through the cooperation of the gas washing tank temperature sensor 318 and a PLC, the inlet and outlet of cooling water can be adjusted in real time, thereby achieving closed-loop temperature control.

[0089] In a preferred embodiment, the gas washing tank 300 is equipped with a gas washing tank tail gas ammonia sensor 308 at the gas washing tank tail gas outlet 307 to detect the presence of ammonia in the gas washing tank tail gas of the gas washing tank 300. The gas washing tank tail gas outlet 307 is connected to the gas washing tank tail gas discharge pipeline 310 via a gas washing tank tail gas discharge pneumatic diaphragm valve 309. When there is no ammonia in the gas washing tank tail gas, it is discharged to the outside through the gas washing tank tail gas discharge pipeline 310. The gas washing tank tail gas outlet 307 is connected to the absorption tank inlet pipeline 201 of the absorption tank 200 via a gas washing tank tail gas to absorption tank pipeline. A gas washing tank tail gas to absorption tank pneumatic diaphragm valve 311 is installed on the gas washing tank tail gas to absorption tank pipeline. When ammonia is present, it re-enters the absorption tank 200 through the absorption tank inlet pipe 201. A pressure transmitter 306 is installed on the side wall of the washing tank 300, and a pH electrode 317 is installed inside the washing tank 300 to detect the pH value of the neutralized solution. A check valve 312 is installed on the washing tank exhaust gas to absorption tank pipe, downstream of the pneumatic diaphragm valve 311. A check valve 313 is installed on the washing tank material outlet pipe 320, downstream of the pneumatic diaphragm valve 319. Real-time closed-loop control of exhaust gas entry and exit can be achieved through the cooperation of the washing tank pressure transmitter 306, the washing tank exhaust gas ammonia sensor 308, and the PLC.

[0090] In a preferred embodiment, the ammonia removal system further includes an acid tank 600 and a PLC. The acid tank material outlet 608 of the acid tank 600 is connected to the washing tank replenishment port of the washing tank 300 via an acid tank material outlet pneumatic diaphragm valve 607. The washing tank replenishment port is equipped with a washing tank inlet acid pneumatic diaphragm valve 305. A washing tank spray ball 303 is installed at the top of the washing tank 300, and the washing tank spray ball 303 is connected to the washing tank replenishment port. A washing tank differential pressure level gauge 321 is installed on the side wall of the washing tank 300 to detect the level of the neutralized liquid inside the washing tank 300. The PLC is connected to the washing tank differential pressure level gauge 321 and the washing tank inlet acid pneumatic diaphragm valve 305. This enables real-time acid replenishment and continuous treatment of the exhaust gas.

[0091] In more preferred embodiments, the acid tank 600 is provided with an acid tank replenishment inlet pipe 601, and the acid tank replenishment inlet pipe 601 is provided with an acid tank replenishment pneumatic diaphragm valve 602; the acid tank 600 is equipped with an acid tank pressure transmitter 603, and the top of the acid tank 600 is provided with an acid tank exhaust outlet 604; the bottom of the acid tank 600 is provided with an acid tank stirrer 605 and an acid tank pH electrode 606, the acid tank pH electrode 606 being used to detect the pH value of the acid in the acid tank 600.

[0092] The working principle of this utility model is as follows:

[0093] The exhaust gas 101 of the fermenter 100 enters the absorption tank 200 through the fermenter exhaust gas pneumatic diaphragm valve 102, the fermenter exhaust gas check valve 103, the absorption tank inlet pipe 201 of the absorption tank 200, the absorption tank inlet pneumatic diaphragm valve 204, and the absorption tank vent 202.

[0094] The double-layered venting holes 202 and the agitator 215 of the absorption tank 200 can uniformly and disperse the ammonia gas in the exhaust gas, allowing it to come into large-area contact with water and mix evenly for absorption. According to relevant data, the solubility of ammonia gas at 25℃ and 1 standard atmosphere is approximately 90g / 100ml water or 35mol / L, and at 0℃ and 1 standard atmosphere, it is approximately 113g / 100ml water. Furthermore, the solubility of ammonia gas increases with higher pressure. Therefore, cooling water is supplied from the cooling water inlet 213 (cooling water temperature 2-8℃) and the cooling water outlet 214 of the absorption tank jacket. The temperature of the absorption tank is controlled below 8℃ by the absorption tank temperature sensor 217, and the tank pressure is controlled between 0.1-0.15MPa by the absorption tank pressure transmitter 206 to increase the solubility of ammonia gas in the water within the absorption tank 200. When ammonia is absorbed in the absorption tank 200, the pH of the absorption liquid will gradually increase. When the pH rises to 9.0, as detected by the pH electrode 216 of the absorption tank, the absorption liquid will flow from the material outlet pipe 219 of the absorption tank, the material outlet pneumatic diaphragm valve 218 of the absorption tank, the material outlet check valve 220 of the absorption tank, through the material inlet 401 of the collection tank, and the material inlet pneumatic diaphragm valve 402 of the collection tank into the collection tank 400 for storage.

[0095] Meanwhile, water tank 500 replenishes water to absorption tank 200 to 70% through water tank material outlet 506, water tank material outlet pneumatic diaphragm valve 505, absorption tank water inlet 222, absorption tank water inlet pneumatic diaphragm valve 205, and absorption tank spray ball 203, under the detection of absorption tank differential pressure level gauge 223. After the fermenter tail gas enters the absorption tank 200, the ammonia is absorbed by the absorption liquid. When the pressure of the other components of the absorption tank tail gas rises to above 0.15MPa under the detection of the absorption tank pressure transmitter 206, if there is no ammonia in the tail gas detected by the absorption tank tail gas ammonia sensor 208, it is discharged to the outside of the system through the absorption tank tail gas discharge pneumatic diaphragm valve 209 and the absorption tank tail gas discharge pipeline 210. If there is ammonia, it enters the washing tank 300 through the absorption tank tail gas to washing tank pipeline 221, the absorption tank tail gas to washing tank pneumatic diaphragm valve 211, the absorption tank tail gas to washing tank check valve 212, the washing tank inlet pipeline 301, and the washing tank inlet pneumatic diaphragm valve 304 to be neutralized and absorbed.

[0096] The ammonia gas that is not absorbed by the absorption tank 200 is treated by the gas washing tank diffuser 302 and the gas washing tank agitator 316, so that the ammonia gas can be evenly and dispersed, allowing it to come into large-area contact with the acid solution and be neutralized and absorbed. Based on the physicochemical properties of ammonia gas, as above, cooling water is supplied from the cooling water inlet 314 (cooling water temperature is 2-8℃) and the cooling water outlet 315 of the cooling water jacket of the washing tank. The temperature of the washing tank 300 is controlled below 8℃ by the temperature sensor 318, and the tank pressure of the washing tank 300 is controlled between 0.1-0.16MPa by the pressure transmitter 306 to increase the amount of ammonia gas absorbed in the acid solution of the washing tank 300. After ammonia is absorbed in the gas scrubbing tank 300, the pH of the neutralized liquid gradually increases. When the pH rises to 8.0, as detected by the pH electrode 317 of the gas scrubbing tank, the neutralized liquid flows from the gas scrubbing tank material outlet pipe 320, the gas scrubbing tank material outlet pneumatic diaphragm valve 319, the gas scrubbing tank material outlet check valve 313, through the material inlet 401 of the collection tank, and the material inlet pneumatic diaphragm valve 402 of the collection tank into the collection tank 400 for storage. At the same time, the acid tank 600 replenishes acid to the gas scrubbing tank 300 to 70% under the detection of the differential pressure level gauge 321, through the acid tank material outlet 608, the acid tank material outlet pneumatic diaphragm valve 607, the gas scrubbing tank acid inlet pneumatic diaphragm valve 305, and the gas scrubbing tank spray ball 303. After the exhaust gas from the absorption tank enters the washing tank 300 via the washing tank 221, the ammonia gas is neutralized and absorbed by the acid. When the pressure of the washing tank exhaust gas 307 rises above 0.16 MPa under the detection of the washing tank pressure transmitter 306, if there is no ammonia gas in the exhaust gas detected by the washing tank exhaust gas ammonia sensor 308, it is discharged outside the system through the washing tank exhaust gas discharge pneumatic diaphragm valve 309 and the washing tank exhaust gas discharge pipeline 310. If there is ammonia gas, it enters the absorption tank via the washing tank exhaust gas to the absorption tank pneumatic diaphragm valve 311, the washing tank exhaust gas to the absorption tank check valve 312, the absorption tank inlet pipeline 201, and the absorption tank inlet pneumatic diaphragm valve 204, where it is absorbed by water. The above steps are repeated until the ammonia gas in the exhaust gas is completely absorbed.

[0097] This invention enables real-time control of ammonia removal from fermenter tail gas: by collecting real-time detection data from temperature sensors, pressure transmitters, pH electrodes, and ammonia sensors via PLC, and adjusting the corresponding parameters according to the actual situation, real-time control of ammonia removal from tail gas is achieved by absorption tank 200 and gas washing tank 300.

[0098] This invention enables continuous ammonia removal from tail gas: By collecting real-time detection data from temperature sensors, pressure transmitters, pH electrodes, ammonia sensors, and differential pressure level gauges via PLC, and continuously replenishing the absorption tank 200 and gas washing tank 300 with water tank 500 and acid tank 600 respectively according to the decrease in liquid level, the absorption tank 200 and gas washing tank 300 can continuously remove ammonia and continuously discharge waste, thus solving the problem of continuous ammonia removal from tail gas during continuous production in fermenters.

[0099] Achieving low-cost ammonia removal from exhaust gas: By utilizing the physicochemical property that ammonia is highly soluble in water, low-cost water is used to absorb ammonia from exhaust gas under pressure at low temperature, which is convenient and inexpensive.

[0100] Achieving the reuse of the absorbent liquid: Ammonia gas is absorbed by water in the absorption tank to generate ammonia water. The ammonia water is weakly alkaline and can be collected to neutralize acidic waste liquid.

[0101] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0102] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. An on-line continuous ammonia removal system for fermenter off-gas, characterized in that, It includes a fermenter (100), an absorption tank (200), a gas washing tank (300), and a collection tank (400). The fermenter tail gas outlet (101) of the fermenter (100) is connected to the absorption tank inlet pipe (201) of the absorption tank (200) through the fermenter tail gas pneumatic diaphragm valve (102). After the tail gas in the fermenter (100) enters the absorption tank (200), the ammonia in the tail gas is absorbed by the water in the absorption tank (200) to form an absorption liquid and the absorption tank tail gas. The absorber material outlet pipe (219) of the absorber tank (200) is connected to the collection tank material inlet (401) of the collection tank (400) through the absorber material outlet pneumatic diaphragm valve (218). The collection tank (400) is used to collect the absorbent liquid in the absorber tank (200). The absorption tank (200) is equipped with an ammonia gas sensor (208) at the absorption tank tail gas outlet (207) to detect whether there is ammonia gas in the absorption tank tail gas in the absorption tank (200). The exhaust outlet (207) of the absorption tank is connected to the exhaust pipeline (210) of the absorption tank through the pneumatic diaphragm valve (209). When there is no ammonia in the exhaust gas of the absorption tank, it is discharged to the outside through the exhaust pipeline (210). The exhaust gas outlet (207) of the absorption tank is connected to the inlet pipe (301) of the washing tank (300) through the exhaust gas to washing tank pipeline (221). The exhaust gas to washing tank pipeline (221) of the absorption tank is equipped with an aerodynamic diaphragm valve (211). When there is ammonia in the exhaust gas of the absorption tank, it enters the washing tank (300) through the inlet pipe (301) of the washing tank and is absorbed by the acid in the washing tank (300) to form a neutralized liquid. The material outlet pipeline (320) of the gas washing tank (300) is connected to the material inlet (401) of the collection tank (400) through the gas washing tank material outlet pneumatic diaphragm valve (319). The collection tank (400) is used to collect the neutralizing liquid in the gas washing tank (300).

2. The on-line continuous ammonia removal system for fermenter off-gas according to claim 1, characterized in that, The absorption tank (200) is provided with an absorption tank vent (202), which is connected to the absorption tank inlet pipeline (201) through the absorption tank inlet pneumatic diaphragm valve (204); An agitator (215) is installed at the bottom of the absorption tank (200). The absorption tank (200) is fitted with a cooling jacket, and the cooling jacket is provided with an absorption tank jacket cooling water inlet (213) and an absorption tank jacket cooling water outlet (214). An absorption tank temperature sensor (217) is installed inside the absorption tank (200).

3. The on-line continuous ammonia removal system for fermenter off-gas according to claim 1, characterized in that, The absorption tank (200) is provided with an absorption tank pressure transmitter (206) on its side wall, and an absorption tank pH electrode (216) is provided inside the absorption tank (200) for detecting the pH value of the absorption liquid. A check valve (212) for the exhaust gas from the absorption tank to the scrubbing tank is provided on the pipeline (221) for the exhaust gas from the absorption tank to the scrubbing tank. The check valve (212) for the exhaust gas from the absorption tank to the scrubbing tank is located downstream of the pneumatic diaphragm valve (211) for the exhaust gas from the absorption tank to the scrubbing tank. The absorber material outlet pipeline (219) is equipped with an absorber material outlet check valve (220), which is located downstream of the absorber material outlet pneumatic diaphragm valve (218).

4. The fermenter tail gas online continuous ammonia removal system according to claim 1, characterized in that, It also includes a water tank (500) and a PLC. The water tank material outlet (506) of the water tank (500) is connected to the absorption tank water inlet (222) of the absorption tank (200) through the water tank material outlet pneumatic diaphragm valve (505). The absorber water inlet (222) is equipped with an absorber water inlet pneumatic diaphragm valve (205), and the top of the absorber (200) is equipped with an absorber spray ball (203), which is connected to the absorber water inlet (222). The absorption tank (200) is equipped with a differential pressure level gauge (223) on its side wall for detecting the level of the absorbent liquid inside the absorption tank (200). The PLC is electrically connected to the differential pressure level gauge (223) and the pneumatic diaphragm valve (205) for water inlet of the absorption tank.

5. The fermenter tail gas online continuous ammonia removal system according to claim 4, characterized in that, The water tank (500) is provided with a water tank water supply inlet pipe (501), and the water tank water supply inlet pipe (501) is provided with a water tank water supply pneumatic diaphragm valve (502). A water tank pressure transmitter (503) is installed on the water tank (500), and a water tank exhaust gas outlet (504) is provided on the top of the water tank (500).

6. The fermenter tail gas online continuous ammonia removal system according to claim 1, characterized in that, The gas washing tank (300) is provided with a gas washing tank vent (302), and the gas washing tank vent (302) is connected to the gas washing tank inlet pipeline (301) through the gas washing tank inlet pneumatic diaphragm valve (304); The bottom of the gas washing tank (300) is equipped with a gas washing tank agitator (316). The gas washing tank (300) is fitted with a cooling jacket, and the cooling jacket is provided with a gas washing tank jacket cooling water inlet (314) and a gas washing tank jacket cooling water outlet (315). The gas washing tank (300) is equipped with a gas washing tank temperature sensor (318).

7. The online continuous ammonia removal system for fermenter tail gas according to claim 1, characterized in that, The gas washing tank (300) is equipped with a gas washing tank tail gas ammonia sensor (308) at the gas washing tank tail gas outlet (307) for detecting whether there is ammonia in the gas washing tank tail gas in the gas washing tank (300). The tail gas outlet (307) of the gas washing tank is connected to the tail gas discharge pipeline (310) of the gas washing tank through the tail gas discharge pneumatic diaphragm valve (309). When there is no ammonia in the tail gas of the gas washing tank, it is discharged to the outside through the tail gas discharge pipeline (310). The gas outlet (307) of the gas scrubbing tank is connected to the gas inlet pipe (201) of the absorption tank (200) through the gas scrubbing tank gas to absorption tank pipeline. The gas scrubbing tank gas to absorption tank pipeline is equipped with a gas scrubbing tank gas to absorption tank pneumatic diaphragm valve (311). When there is ammonia in the gas scrubbing tank gas, it enters the absorption tank (200) again through the gas inlet pipe (201). The gas washing tank (300) is provided with a gas washing tank pressure transmitter (306) on its side wall, and a gas washing tank pH electrode (317) is provided inside the gas washing tank (300) for detecting the pH value of the neutralization solution. A check valve (312) for the tail gas from the gas scrubbing tank to the absorption tank is installed on the pipeline of the gas scrubbing tank tail gas to the absorption tank. The check valve (312) for the tail gas from the gas scrubbing tank tail gas to the absorption tank is located downstream of the pneumatic diaphragm valve (311) for the tail gas from the gas scrubbing tank tail gas to the absorption tank. The material outlet pipeline (320) of the gas washing tank is equipped with a material outlet check valve (313), which is located downstream of the material outlet pneumatic diaphragm valve (319) of the gas washing tank.

8. The online continuous ammonia removal system for fermenter tail gas according to claim 1, characterized in that, It also includes an acid tank (600) and a PLC. The acid tank material outlet (608) of the acid tank (600) is connected to the gas washing tank replenishment port of the gas washing tank (300) through the acid tank material outlet pneumatic diaphragm valve (607). The gas washing tank replenishment port is equipped with a gas washing tank acid inlet pneumatic diaphragm valve (305), and a gas washing tank spray ball (303) is installed at the top inside the gas washing tank (300). The gas washing tank spray ball (303) is connected to the gas washing tank replenishment port. The side wall of the gas washing tank (300) is equipped with a gas washing tank differential pressure level gauge (321) for detecting the level of the neutralizing liquid inside the gas washing tank (300). The PLC is connected to the gas washing tank differential pressure level gauge (321) and the gas washing tank acid inlet pneumatic diaphragm valve (305).

9. The fermenter tail gas online continuous ammonia removal system according to claim 8, characterized in that, The acid tank (600) is provided with an acid tank replenishment inlet pipe (601), and the acid tank replenishment inlet pipe (601) is provided with an acid tank replenishment pneumatic diaphragm valve (602). An acid tank pressure transmitter (603) is installed on the acid tank (600), and an acid tank exhaust gas outlet (604) is provided on the top of the acid tank (600). The bottom of the acid tank (600) is provided with an acid tank stirrer (605) and an acid tank pH electrode (606), which is used to detect the pH value of the acid in the acid tank (600).

10. The fermenter tail gas online continuous ammonia removal system according to claim 1, characterized in that, A pneumatic diaphragm valve (402) for material inlet of the collection tank is provided at the material inlet (401) of the collection tank. The top of the collection tank (400) is provided with a collection tank pressure transmitter (403) and a collection tank exhaust gas outlet pipe (404). The bottom of the collection tank (400) is provided with a collection tank agitator (405) and a collection tank material outlet pipe (407). A collection tank material outlet pneumatic diaphragm valve (406) is provided on the collection tank material outlet pipe (407).

Images