Stirring type 2-MD decomposition tank

Abstract

The utility model belongs to the technical field of polyester production equipment, and particularly relates to a stirring type 2-MD decomposing tank which comprises a tank body, a partition plate I and a partition plate II are arranged in the tank body, and the partition plate I and the partition plate II divide the internal space of the tank body into a decomposing cavity, a separating cavity and a liquid discharging cavity, a heater used for heating liquid, a temperature sensor I used for detecting the temperature of the liquid and a pH sensor used for detecting the pH value of the liquid are arranged in the decomposition cavity, the decomposition cavity is communicated with an air inlet pipe I, a liquid inlet pipe I and a liquid inlet pipe II, the end, located in the decomposition cavity, of the air inlet pipe I is immersed below the liquid level, and first valves are installed on the liquid inlet pipe I and the liquid inlet pipe II; a stirring blade is arranged in the separation cavity, and the top of the separation cavity is communicated with a gas discharge pipe; the bottom of the liquid discharging cavity communicates with a liquid discharging pipe, and a second valve is installed on the liquid discharging pipe. The device is suitable for the decomposition reaction taking gaseous 2-MD as a raw material, the heat of the gaseous raw material is fully utilized, and the heat waste is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to polyester production equipment technical field, concretely relates to a stirring type 2-MD decomposition tank. BACKGROUND

[0002] Polyethylene terephthalate (abbreviation polyester, PET) is by fine terephthalic acid (PTA) and ethylene glycol (EG) first esterification synthesis bis-hydroxyethyl terephthalate, then carries out polycondensation reaction and is prepared, belongs to crystalline saturated polyester, is milky white or light yellow, highly crystalline polymer, surface smooth has luster, its wide application in textile, packaging, electronics, electrical appliances, medical instruments, building etc.. In the polyester production process, esterification reaction is one of the key steps, and the treatment of esterification water is an indispensable link in the process. The traditional esterification water treatment process includes direct cold air discharge, slurry heat exchange discharge, hot water type lithium bromide refrigerator heat exchange and the current mainstream process steam power generation. Through further research, it is found that in the process of steam power generation, the COD of esterification water discharged by the liquid ring vacuum pump is more than ten times that of the condenser esterification water. 2-Methyl-1, 3-dioxolane (2-MD) in esterification water can be decomposed to generate EG and acetaldehyde, and the organic matter (containing 2-methyl-1, 3-dioxolane, 2-MD) in the esterification water is stripped by a stripping tower, and then the organic matter is condensed into liquid and sent into a decomposition tank to obtain EG and acetaldehyde (2-MD is decomposed to obtain EG and acetaldehyde), and the esterification water discharged from the stripping tower is discharged after a series of sewage treatment. However, in this process, 2-MD is always dissolved in esterification water, therefore, we consider using a screw vacuum pump to replace the liquid ring vacuum pump, and the gaseous organic matter (esterification power generation tail gas) is discharged during the vacuum pumping process of the screw vacuum pump, if the existing 2-MD decomposition tank is used, the esterification power generation tail gas needs to be condensed into liquid, so that additional heat exchange equipment is increased; and the decomposition temperature of 2-MD is 85-88 DEG C, and the esterification power generation tail gas needs to be heated again after being condensed into liquid, so that the heat of the esterification power generation tail gas is wasted. Therefore, we consider designing a decomposition tank structure using gaseous organic matter as raw material. UTILITY MODEL CONTENTS

[0003] The utility model intends to provide a stirring type 2-MD decomposition tank to solve the problem that the existing 2-MD decomposition tank is not suitable for decomposition with gaseous organic matter as raw material.

[0004] In order to achieve the above object, the utility model discloses the scheme for: a stirring type 2-MD decomposition tank, including the jar body, be equipped with the baffle I and the baffle II in the jar body, the baffle I and the baffle II divide the inside space of jar body into decomposition chamber, separation chamber and discharge chamber, the top of decomposition chamber, separation chamber and discharge chamber is linked together, be equipped with the heater for heating liquid, temperature sensor I for detecting liquid temperature and pH sensor for detecting liquid pH in the decomposition chamber, and decomposition chamber is linked together and goes into the liquid pipe I, liquid pipe I and liquid pipe II, and the one end of liquid pipe I is immersed below the liquid level in the decomposition chamber, and is all installed with first valve on liquid pipe I and liquid pipe II, be equipped with the stirring shaft in the separation chamber, and the stirring blade is fixedly connected on the stirring shaft, and the motor for driving the stirring shaft rotation is equipped with outside jar body, and the top of separation chamber is linked together and goes out the gas discharge pipe, the bottom of discharge chamber is linked together and goes out the discharge pipe, and is installed with second valve on the discharge pipe.

[0005] The working principle and beneficial effects of the present scheme are as follows: in the present scheme, liquid is added to the decomposition chamber through liquid inlet pipe I (the source of the liquid can be esterification water from a gas-liquid separator or desalted water), to ensure that the liquid level in the tank remains within a certain range. Esterification power generation tail gas enters below the liquid level in the decomposition chamber through gas inlet pipe I, and the heat carried by the esterification power generation tail gas is absorbed by the liquid, thereby utilizing the heat of the esterification power generation tail gas. In the decomposition chamber, 2-MD in the esterification power generation tail gas undergoes a decomposition reaction under decomposition conditions (pH 1.5-2.5, temperature 85-88°C) to generate ethylene glycol and acetaldehyde. The liquid enters the separation chamber and is stirred by the stirring blades. The stirring creates a micro-negative pressure environment in the liquid, so that the acetaldehyde in the liquid can be better separated out. The acetaldehyde and non-condensable gas are discharged through the gas discharge pipe. The liquid continues to enter the discharge chamber, where it is an ethylene glycol aqueous solution, which is discharged through the discharge pipe.

[0006] Furthermore, the decomposition chamber of the present scheme can maintain the decomposition conditions of 2-MD to ensure that the decomposition reaction of 2-MD proceeds smoothly. Specifically, the pH sensor detects the pH of the liquid in the decomposition chamber, and pH adjuster is added to the decomposition chamber through liquid inlet pipe II to ensure that the pH of the liquid in the decomposition chamber remains at 1.5-2.5. The temperature of the liquid in the decomposition chamber is detected by a temperature sensor, and the heater maintains the temperature of the liquid at 85-88°C.

[0007] In summary, the present scheme can use gaseous organic matter (esterification power generation tail gas) as raw material to decompose 2-MD and obtain ethylene glycol and acetaldehyde, thereby providing a new structure for the decomposition of 2-MD. Furthermore, the present scheme makes full use of the heat carried by the esterification power generation tail gas, avoiding the loss of this part of heat. In addition, the present scheme can accurately control the temperature and pH of the liquid in the decomposition chamber, thereby ensuring the smooth decomposition of 2-MD.

[0008] Optionally, the gas discharge pipe comprises a discharge section I and a discharge section II, a condensation reflux cavity is arranged between the discharge section I and the discharge section II, a cooling jacket is arranged outside the condensation reflux cavity, the bottom end of the discharge section I is communicated with the separation cavity, the top end of the discharge section I is provided with a downwardly bent portion, the bent portion of the top end of the discharge section I is communicated with the bottom of the condensation reflux cavity, and the discharge section II is communicated with the top end of the condensation reflux cavity; the bottom end of the condensation reflux cavity is communicated with a reflux pipe, and the end of the reflux pipe away from the condensation reflux cavity is communicated with the top of the decomposition cavity.

[0009] In order to avoid the escape of ethylene glycol and 2-MD, the condensation reflux cavity is arranged between the discharge section I and the discharge section II in the present scheme, the discharged gas is cooled by the cooling jacket, so that the temperature of the discharged gas is reduced to 20-30 DEG C, so that the gaseous ethylene glycol and 2-MD are condensed into liquid and refluxed into the decomposition cavity through the reflux pipe. In the above process, the bent portion at the top end of the discharge section I can effectively prevent liquid from flowing into the discharge section I.

[0010] Optionally, the top of the condensation reflux cavity is provided with a temperature sensor II for detecting temperature.

[0011] In the present scheme, the temperature at the top end of the condensation reflux cavity is detected by the temperature sensor, so that the temperature of the gas before entering the discharge section II is reduced to 20-30 DEG C, and it is ensured that ethylene glycol and 2-MD do not escape.

[0012] Optionally, the bottom end of the gas discharge pipe is fixedly connected with a gas collecting hopper, a closed gas collecting cavity is formed between the gas collecting hopper and the top wall of the tank body, the top wall of the tank body is provided with a gas discharge port, and the gas discharge port is located in the coverage range of the gas collecting hopper.

[0013] In the present scheme, the design of the gas collecting hopper allows the number of gas discharge ports to be increased, so that the amount of gas flowing out of the tank body per unit time is increased.

[0014] Optionally, an explosion-proof fan I is arranged on the discharge section II, and a pressure sensor for detecting gas pressure is arranged in the gas collecting hopper.

[0015] In the present scheme, the gas pressure in the gas collecting hopper is detected by the pressure sensor, and the gas discharge amount is controlled by the explosion-proof fan I, so that the gas pressure in the gas collecting hopper is controlled to be 1-8 kPa, and the gas discharge amount is prevented from being too large to cause the condensation of the condensation reflux cavity to be not timely.

[0016] Optionally, a liquid level meter for detecting the liquid level height in the decomposition cavity is arranged on the tank body.

[0017] In the scheme, the liquid level meter is used to detect the liquid level height in the decomposition cavity, so that the staff can master the liquid level in the decomposition cavity, and the liquid in the decomposition cavity can be added or the liquid in the drainage cavity can be discharged in time, so that the liquid level height in the decomposition cavity is kept in a suitable range.

[0018] Optionally, the tank is externally provided with a controller, the temperature sensor I, the pH sensor and the liquid level meter are electrically connected with the controller, the controller controls the operation of the heater according to the signal transmitted by the temperature sensor I, the controller controls the opening degree of the first valve on the liquid inlet pipe II according to the signal transmitted by the pH sensor, and the controller controls the opening degree of the first valve on the liquid inlet pipe I and the second valve on the liquid outlet pipe according to the signal transmitted by the liquid level.

[0019] The scheme realizes automatic detection and control of the temperature, pH value and liquid level height of the liquid in the decomposition cavity, improves the automation degree of the decomposition tank, and reduces the workload of the staff.

[0020] Optionally, the decomposition cavity is also communicated with the air inlet pipe II, the air inlet pipe II is provided with the explosion-proof fan II, and one end of the air inlet pipe II immersed below the liquid surface in the decomposition cavity.

[0021] In the scheme, the air inlet pipe II can supply other process tail gas containing 2-MD into the decomposition cavity for decomposition reaction.

[0022] Optionally, the liquid outlet pipe is provided with a flow meter.

[0023] In the scheme, the flow meter is used to detect the flow of the liquid in the liquid outlet pipe, so that the staff can master the discharge data of the liquid. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structure schematic view of the stirring type 2-MD decomposition tank in the embodiment one of the utility model;

[0025] Figure 2 It is a structure schematic view of the stirring type 2-MD decomposition tank in the embodiment two of the utility model. CONCRETE EMBODIMENT

[0026] The following is further described in detail through concrete embodiment:

[0027] The marks in the drawings of the specification include: tank body 1, decomposition cavity 101, separation cavity 102, liquid discharge cavity 103, partition I 2, partition II 3, heater 4, temperature sensor I 5, pH sensor 6, liquid level meter 7, air inlet pipe I 8, liquid inlet pipe I 9, liquid inlet pipe II 10, first valve 11, stirring shaft 12, stirring blade 13, motor 14, gas discharge pipe 15, discharge section I 151, backfolding part 15101, discharge section II 152, condensate return cavity 16, cooling jacket 17, gas collecting hopper 18, gas discharge port 19, return pipe 20, temperature sensor II 21, liquid discharge pipe 22, second valve 23, flow meter 24, controller 25, explosion-proof fan I 26, pressure sensor 27, air inlet pipe II 28, explosion-proof fan II 29.

[0028] Example one

[0029] The embodiment is basically as Figure 1 shown: a stirring type 2-MD decomposition tank, comprising a tank body 1, a partition I 2 and a partition II 3 are arranged in the tank body 1, the partition I 2 and the partition II 3 divide the internal space of the tank body 1 into a decomposition cavity 101, a separation cavity 102 and a liquid discharge cavity 103, and the top of the decomposition cavity 101, the separation cavity 102 and the liquid discharge cavity 103 are communicated.

[0030] A heater 4 for heating liquid, a temperature sensor I 5 for detecting the temperature of the liquid, and a pH sensor 6 for detecting the pH value of the liquid are arranged in the decomposition cavity 101, and a liquid level meter 7 for detecting the liquid level height in the decomposition cavity 101 is arranged on the tank body 1; the decomposition cavity 101 is communicated with an air inlet pipe I 8, a liquid inlet pipe I 9 and a liquid inlet pipe II 10, one end of the air inlet pipe I 8 is immersed below the liquid surface in the decomposition cavity 101, in this embodiment, the gas outlet port of the air inlet pipe I 8 is immersed below the liquid surface by 5 cm, and the first valve 11 is arranged on the liquid inlet pipe I 9 and the liquid inlet pipe II 10. In this embodiment, the air inlet pipe I 8 is used for introducing esterification power generation tail gas into the decomposition cavity 101, the liquid inlet pipe I 9 is used for introducing gas-liquid separator esterification water (the gas-liquid separator and the condenser are located between the steam power generation device and the screw vacuum pump, the condenser is used for reducing the temperature of the gas phase entering the screw vacuum pump, and the gas-liquid separator is used for separating the gas phase and the liquid phase, and the liquid phase is the gas-liquid separator esterification water) or desalted water into the decomposition cavity 101, and the liquid inlet pipe II 10 is used for introducing pH adjusting liquid (the pH adjusting liquid in this embodiment is phosphoric acid solution) into the decomposition cavity 101; in addition, the heater 4 is an electric heating tube.

[0031] The separation cavity 102 is provided with a stirring shaft 12, and the stirring shaft 12 is fixedly connected with stirring blades 13 in a rice-shaped pattern. The tank body 1 is externally provided with a motor 14 for driving the stirring shaft 12 to rotate. The top of the separation cavity 102 is communicated with a gas discharge pipe 15. Specifically, the gas discharge pipe 15 comprises a discharge section I 151 and a discharge section II 152. A condensation backflow cavity 16 is arranged between the discharge section I 151 and the discharge section II 152. The condensation backflow cavity 16 is externally provided with a cooling jacket 17. The bottom end of the discharge section I 151 is welded with a gas collecting hopper 18, and the discharge section I 151 is in communication with the interior of the gas collecting hopper 18. A closed gas collecting cavity is formed between the gas collecting hopper 18 and the top wall of the tank body 1. A gas discharge port 19 is formed in the top wall of the tank body 1, and the gas discharge port 19 is located within the coverage range of the gas collecting hopper 18. The top end of the discharge section I 151 is provided with a downwardly bent portion 15101, and the bent portion 15101 at the top end of the discharge section I 151 is in communication with the bottom of the condensation backflow cavity 16. The discharge section II 152 is in communication with the top end of the condensation backflow cavity 16. The bottom end of the condensation backflow cavity 16 is communicated with a backflow pipe 20, and the end of the backflow pipe 20 away from the condensation backflow cavity 16 is in communication with the top of the decomposition cavity 101. The top of the condensation backflow cavity 16 is provided with a temperature sensor II 21 for detecting temperature.

[0032] The bottom of the liquid discharge cavity 103 is communicated with a liquid discharge pipe 22, and the liquid discharge pipe 22 is installed with a second valve 23 and a flow meter 24. The tank body 1 is externally provided with a controller 25. The temperature sensor I 5, the pH sensor 6, the liquid level meter 7 and the temperature sensor II 21 are all electrically connected with the controller 25. The controller 25 controls the heater 4 to work according to the signal transmitted by the temperature sensor I 5, so as to control the temperature of the liquid in the decomposition cavity 101 to be 85-88℃. The controller 25 controls the opening of the first valve 11 on the liquid inlet pipe II 10 according to the signal transmitted by the pH sensor 6, so as to control the pH value of the liquid in the decomposition cavity 101 to be 1.5-2.5. The controller 25 controls the opening of the first valve 11 on the liquid inlet pipe I 9 and the second valve 23 on the liquid discharge pipe 22 according to the signal transmitted by the liquid level meter, so as to control the height of the liquid in the decomposition cavity 101 to be within a proper range. The controller 25 controls the flow of the cooling water in the cooling jacket 17 according to the signal transmitted by the temperature sensor II 21, so as to control the temperature at the top of the backflow condensation cavity to be 20-30℃. In the embodiment, the controller 25 is a PLC.

[0033] In specific use, the esterification power generation tail gas enters the decomposition cavity 101 through the gas inlet pipe I 8 and fully contacts with the liquid in the decomposition cavity 101. Under the condition that the temperature is 85-88℃ and the pH value is 1.5-2.5, the 2-MD in the esterification power generation tail gas is decomposed into ethylene glycol and acetaldehyde. Since the boiling point of acetaldehyde is low, it is in gaseous state at 85-88℃, while the boiling point of ethylene glycol is much higher than 88℃, so the ethylene glycol remains in the liquid.

[0034] Then, the liquid in the decomposition chamber 101 flows into the separation chamber 102, the motor 14 is started, the motor 14 drives the stirring shaft 12 to rotate, so that the stirring blade 13 stirs the liquid; under the stirring of the stirring blade 13, the liquid in the separation chamber 102 flows more intensively, so that a micro-negative pressure environment is formed in the liquid, so that the acetaldehyde is better separated out. The acetaldehyde in the tank 1 enters the gas collecting hopper 18 through the gas discharge port 19 on the top wall of the separation chamber 102, and then is discharged through the discharge section I 151, the condensation reflux chamber 16 and the discharge section II 152. In the process of discharging the gas, the volatile ethylene glycol and 2-MD are contained in the gas, the volatile ethylene glycol and 2-MD are condensed into liquid state by losing heat when passing through the condensation reflux chamber 16, the liquid ethylene glycol and 2-MD flow down along the inner wall of the condensation reflux chamber 16, and flow into the decomposition chamber 101 through the reflux pipe 20, so as to prevent the ethylene glycol and 2-MD from escaping, and send the unreacted 2-MD back to the decomposition chamber 101 for continuous reaction. In this process, since the top end of the discharge section I 151 has a downward backfolding part 15101, the condensed liquid in the condensation reflux chamber 16 will not enter the discharge section I 151. In this way, the gas discharged through the gas discharge pipe 15 is acetaldehyde and non-condensable gas. Finally, the liquid in the separation chamber 102 flows into the liquid discharge chamber 103, and is discharged through the liquid discharge pipe 22, and the discharged liquid is ethylene glycol solution.

[0035] In the above process, the temperature sensor I 5 detects the temperature of the liquid in the decomposition cavity 101 in real time. When the temperature is lower than 85°C, the controller 25 controls the heater 4 to work to heat the liquid in the decomposition cavity 101, so that the temperature of the liquid rises. When the temperature of the liquid is higher than 88°C, the controller 25 controls the heater 4 to stop working, so that the temperature of the liquid is kept at 85-88°C. The pH sensor 6 detects the pH value of the liquid in the decomposition cavity 101 in real time. When the pH value is higher than 2.5, the controller 25 controls the first valve 11 on the liquid inlet pipe II 10 to open, and the pH adjusting liquid (phosphoric acid solution) flows into the decomposition cavity 101, so that the pH value of the liquid decreases. When the pH value is lower than 1.5, the controller 25 controls the first valve 11 on the liquid inlet pipe II 10 to close, so that the pH value of the liquid is kept at 1.5-2.5. The liquid level meter 7 detects the liquid level height in the decomposition cavity 101 in real time. When the liquid level height in the decomposition cavity 101 is too high, the controller 25 controls the first valve 11 on the liquid inlet pipe I 9 to close and / or controls the second valve 23 on the liquid outlet pipe 22 to open, so that the liquid level height decreases. When the liquid level height in the decomposition cavity 101 is too low, the controller 25 controls the first valve 11 on the liquid inlet pipe I 9 to open and / or controls the second valve 23 on the liquid outlet pipe 22 to close, so that the liquid level height increases, thereby controlling the liquid level height in the decomposition cavity 101 to be in a proper range. In the process, the staff can master the discharge capacity of the liquid outlet pipe 22 through the flow meter 24, and ensure that the discharge capacity of the liquid outlet pipe 22 is stable in a certain range. The temperature sensor II 21 detects the temperature at the top of the condensation reflux cavity 16 in real time. When the temperature is higher than 30°C, the controller 25 controls the cooling water flow in the cooling jacket 17 to increase, so that the temperature decreases. When the temperature is lower than 20°C, the controller 25 controls the cooling water flow in the cooling jacket 17 to decrease, so that the temperature at the top of the condensation reflux cavity 16 is kept at 20-30°C.

[0036] In summary, in the embodiment, the esterification power generation tail gas is used as the raw material, the 2-MD decomposition reaction is carried out in the tank body 1, acetaldehyde and ethylene glycol are obtained, and the separation of acetaldehyde and ethylene glycol is realized.

[0037] Example Two

[0038] The difference between the embodiment and Example One is that, as shown in FIG. 2, the liquid inlet pipe I 9 is connected to the liquid inlet pipe II 10, and the liquid outlet pipe 22 is connected to the liquid outlet pipe II 21. Figure 2As shown, in the embodiment, the explosion-proof fan 126 is installed on the discharge section II 152, the pressure sensor 27 for detecting the air pressure is arranged in the gas collecting hopper 18, the pressure sensor 27 is electrically connected with the controller 25, and the controller 25 controls the explosion-proof fan 126 to work according to the signal transmitted by the pressure sensor 27. In addition, the air inlet pipe II 128 is communicated with the decomposition chamber 101, the explosion-proof fan 129 is installed on the air inlet pipe II 128, and the end of the air inlet pipe II 128 immersed in the liquid in the decomposition chamber 101 is below the liquid surface. In the embodiment, the air outlet of the air inlet pipe II 128 is below the liquid surface by 5 cm.

[0039] In the embodiment, under the air supply of the explosion-proof fan 129, other process tail gas containing 2-MD generated in the polyester production process can enter the decomposition chamber 101 through the air inlet pipe II 128, so as to recycle and utilize the 2-MD in the process tail gas. In addition, the pressure sensor 27 is used to detect the air pressure in the gas collecting hopper 18 in real time, when the air pressure is lower than 1 kPa, the controller 25 controls the rotation speed of the explosion-proof fan 126 to be reduced, so as to increase the air pressure in the gas collecting hopper 18; when the air pressure in the gas collecting hopper 18 is higher than 8 kPa, the controller 25 controls the rotation speed of the explosion-proof fan 126 to be increased, so as to reduce the air pressure in the gas collecting hopper 18, thereby controlling the air pressure in the gas collecting hopper 18 to be kept at 1-8 kPa, and further controlling the discharge flow of acetaldehyde and non-condensable gas, and keeping the micro-positive pressure in the gas collecting hopper 18.

[0040] The above-mentioned is only the embodiment of the present application, and the well-known specific structure and characteristics and other common knowledge in the scheme are not described in detail. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be regarded as the protection range of the present application, and these will not affect the effect and practicability of the present application. The specific embodiments and the like in the specification can be used to explain the content of the claims.

Claims

1. A stirred 2-MD decomposer tank comprising a tank body, characterised in that: The tank body is provided with a baffle I and a baffle II, the baffle I and the baffle II separate the internal space of the tank body into a decomposition chamber, a separation chamber and a liquid discharge chamber, the decomposition chamber, the separation chamber and the liquid discharge chamber are communicated at the top, the decomposition chamber is provided with a heater for heating liquid, a temperature sensor I for detecting the temperature of the liquid and a pH sensor for detecting the pH value of the liquid, the decomposition chamber is communicated with an air inlet pipe I, a liquid inlet pipe I and a liquid inlet pipe II, one end of the air inlet pipe I immersed below the liquid surface in the decomposition chamber, the first valve is installed on the liquid inlet pipe I and the liquid inlet pipe II; the separation chamber is provided with a stirring shaft, the stirring shaft is fixedly connected with stirring blades, the tank body is provided with a motor for driving the stirring shaft to rotate, the top of the separation chamber is communicated with a gas discharge pipe; the bottom of the liquid discharge chamber is communicated with a liquid discharge pipe, the second valve is installed on the liquid discharge pipe.

2. The agitated 2-MD decomposer tank of claim 1, wherein: The gas discharge pipe comprises a discharge section I and a discharge section II, a condensation return chamber is arranged between the discharge section I and the discharge section II, a cooling jacket is arranged outside the condensation return chamber, the bottom end of the discharge section I is communicated with the separation chamber, the top end of the discharge section I has a downward return portion, and the return portion of the top end of the discharge section I is communicated with the bottom of the condensation return chamber, the discharge section II is communicated with the top end of the condensation return chamber; the bottom end of the condensation return chamber is communicated with a return pipe, and the end of the return pipe away from the condensation return chamber is communicated with the top of the decomposition chamber.

3. The agitated 2-MD decomposer tank of claim 2, wherein: The top of the condensation return chamber is provided with a temperature sensor II for detecting temperature.

4. The agitated 2-MD decomposer tank of claim 2, wherein: The bottom end of the gas discharge pipe is fixedly connected with a gas collecting hopper, a closed gas collecting chamber is formed between the gas collecting hopper and the top wall of the tank body, the top wall of the tank body is provided with a gas discharge port, and the gas discharge port is located in the coverage range of the gas collecting hopper.

5. The agitated 2-MD decomposer tank of claim 4, wherein: An explosion-proof fan I is installed on the discharge section II, and a pressure sensor for detecting gas pressure is arranged in the gas collecting hopper.

6. The agitated 2-MD decomposer tank of claim 1, wherein: A liquid level meter for detecting the liquid level in the decomposition chamber is arranged on the tank body.

7. The agitated 2-MD decomposer tank of claim 6, wherein: A controller is arranged outside the tank body, the temperature sensor I, the pH sensor and the liquid level meter are electrically connected with the controller, the controller controls the heater according to the signal transmitted by the temperature sensor I, the controller controls the opening degree of the first valve on the liquid inlet pipe II according to the signal transmitted by the pH sensor, and the controller controls the opening degree of the first valve on the liquid inlet pipe I and the second valve on the liquid discharge pipe according to the signal transmitted by the liquid level.

8. The agitated 2-MD decomposer tank of claim 1, wherein: The decomposition chamber is also communicated with an air inlet pipe II, an explosion-proof fan II is installed on the air inlet pipe II, and one end of the air inlet pipe II immersed below the liquid surface in the decomposition chamber.

9. The agitated 2-MD decomposer tank of claim 1, wherein: A flow meter is installed on the liquid discharge pipe.

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