CN218222371U - Device for slowing down self-polymerization of vinyl chloride monomer - Google Patents

Abstract

The utility model provides a device for slowing down the self-polymerization of vinyl chloride monomer, which relates to the technical field of chlor-alkali industrial production and comprises a spherical tank, a heat exchanger and a waste water tank; the heat exchanger comprises an upper end enclosure, a body and a lower end enclosure, wherein the body comprises a shell and a plurality of heat exchange tubes arranged inside the shell; the spherical tank is provided with a first monomer backflow outlet, a wastewater discharge port and a first monomer backflow inlet, the first monomer backflow outlet is introduced into the shell through a first backflow pipeline, and the first monomer backflow inlet is communicated with the shell through a second backflow pipeline; a monomer delivery pump is arranged on the first backflow pipeline; the waste water outlet is communicated with the heat exchange tube through a first waste water pipeline, and the heat exchange tube is communicated with the waste water tank through a second waste water pipeline; the utility model discloses a cooling waste water after the gas-liquid separation that the heat exchanger will pass through the tube side and the chloroethylene monomer heat transfer through the shell side utilize heat energy exchange to realize the free cooling of backward flow circulation chloroethylene.

Description

A device for slowing down the self-polymerization of vinyl chloride monomer

technical field

The utility model relates to the technical field of chlor-alkali industrial production, in particular to a device for slowing down the self-polymerization of vinyl chloride monomers.

Background technique

In the process of PVC production, self-polymerization of vinyl chloride monomer (that is, vinyl chloride monomer) is not only the primary problem restricting the normal operation of the rectification system, but also often occurs when the temperature is high, the pressure of the spherical tank is high, or the water removal is poor. The self-polymerization of vinyl chloride monomer spherical tanks and monomer pipelines has a great impact on the normal production of the polymerization system and the quality of PVC resin products. Therefore, by slowing down and eliminating the self-polymerization of vinyl chloride monomer, the production efficiency can be improved, the production cost can be reduced and the product quality can be improved.

In order to slow down or prevent the self-polymerization of vinyl chloride monomer, generally by reducing the water content and oxygen content in vinyl chloride monomer, controlling the PH value, adding a polymerization inhibitor, controlling the liquid level and temperature of the vinyl chloride monomer storage tank, controlling the vinyl chloride monomer Body pipeline pressure and other methods. In the prior art, only the bottom of the vinyl chloride spherical tank is drained to the waste water tank to control the water content of the vinyl chloride monomer and slow down the self-polymerization of the vinyl chloride monomer. This method is a commonly used method for controlling the water content of the vinyl chloride monomer, and is also a method for slowing down the self-polymerization of the vinyl chloride monomer.

The Chinese patent with the application number CN202022434442.0 discloses a device for reducing the self-polymerization of vinyl chloride monomer in a spherical tank, including a refined monomer cooler, a spherical tank and a drainage tank. The fine monomer pipeline, the fine monomer tank inlet pipeline is fixedly connected between the top tube side outlet of the fine monomer cooler and the bottom inlet of the spherical tank, and the drain pipeline is fixedly connected between the drain outlet at the bottom of the spherical tank and the water inlet at the top of the drainage tank The water outlet at the bottom of the drainage tank is fixedly connected with a sewage pipeline, and the air inlet in the middle of the drainage tank is fixedly connected with a low-pressure steam pipeline. The utility model lowers the temperature of the vinyl chloride monomer entering the spherical tank and automatically drains the spherical tank, so that the temperature and pressure of the spherical tank are reduced, the spherical tank has an obvious dewatering effect, and the self-polymerization phenomenon is reduced. The wastewater discharged from the spherical tank contains about 50% vinyl chloride monomer. Vinyl chloride is a colorless, liquefied gas with a boiling point of -13.9°C, so it is easy to vaporize from the wastewater, and vaporization will take away a lot of heat, and the temperature will drop. It can also slow down the self-polymerization of vinyl chloride monomer. But there is no connection between the above-mentioned device drainage tank and the cooler, which causes heat waste.

The invention patent with the application number CN202020855873.1 discloses a distillation device for light-curing monomers, including a distillation tower with a feed pipe connected to the top, top nozzles, middle nozzles and return pipes arranged in sequence from top to bottom, and the gas phase is single The solid enters the distillation tower through the feed pipe, condenses into a liquid phase through the condenser, enters the reflux tank, part of it is transported to the finished product tank, and part of it is refluxed to the top of the distillation tower to achieve the reflux ratio of the distillation process and mix with the quantitatively delivered anaerobic inhibitor Finally, it is sprayed through the top nozzle to reduce the risk of self-polymerization of the gas phase monomer in the upper part of the distillation tower. At the same time, the liquid phase monomer containing a high concentration of inhibitors is accumulated at the bottom of the distillation tower, which is transported to the middle nozzle through the return pipe and sprayed to reduce the risk of self-polymerization in the middle and lower parts of the distillation tower. Risk of self-polymerization of gas-phase monomers. But this device does not take into account the discharge of waste water.

Therefore, it is necessary to provide a device and method that can rationally utilize the discharged waste water to reduce the temperature of the vinyl chloride monomer in the reflux cycle and slow down the self-polymerization of the vinyl chloride monomer in the spherical tank.

Utility model content

Based on the above problems, the purpose of this utility model is to provide a device for slowing down the self-polymerization of vinyl chloride monomer.

In order to achieve the above object, the utility model provides the following technical solutions:

A device for slowing down the self-polymerization of vinyl chloride monomer, including a spherical tank, a heat exchanger and a waste water tank;

The heat exchanger includes an upper head, a body and a lower head that are sealed and connected to each other. The body includes a shell and several heat exchange tubes arranged inside; there is a certain gap between the shell and the heat exchange tubes;

The spherical tank is provided with a first monomer reflux outlet, a waste water outlet and a first monomer reflux inlet,

The first monomer reflux outlet leads into the housing through a first reflux pipe, and the first monomer reflux inlet communicates with the housing through a second reflux pipe; There is a monomer delivery pump; the vinyl chloride monomer pumped out of the spherical tank passes through the first return pipe into the shell, then flows through the inside of the body and returns to the spherical tank through the second return pipe;

The waste water discharge port leads into the heat exchange tube through the first waste water pipe, and the heat exchange pipe communicates with the waste water tank through the second waste water pipe; the waste water discharged from the spherical tank passes through the first waste water The pipeline leads into the heat exchange tube, the waste water flows through the heat exchange tube and then flows into the waste water tank through the second waste water pipe;

A first exhaust port is provided on the top of the heat exchanger, and the first exhaust port leads to the gas cabinet through a first exhaust pipe. The vinyl chloride monomer vaporized during the waste water flowing through the heat exchange tube is led to the gas cabinet through the first exhaust pipe for recovery.

Preferably, a second monomer return outlet and a second monomer return inlet are respectively provided above and below the housing, and the first monomer return outlet and the second monomer return inlet pass through the The first return pipeline is connected; the second monomer return outlet is connected with the first monomer return inlet through the second return pipeline. There is a certain gap between the shell and the heat exchange tube, and the vinyl chloride monomer pumped from the spherical tank flows through the inner shell side of the heat exchanger and then returns to the spherical tank.

Preferably, the upper head is provided with a waste water inlet, and the waste water outlet is connected to the waste water inlet through a first waste water pipe; the bottom of the lower head is provided with a waste water outlet, and the waste water outlet passes through the The second waste water pipeline communicates with the waste water tank. The vinyl chloride monomer discharged from the spherical tank flows through the inner tube of the heat exchanger and then flows into the waste water tank.

Preferably, a first reflux valve and a second reflux valve are sequentially provided between the first reflux outlet and the monomer delivery pump, and sequentially provided between the monomer delivery pump and the second monomer reflux inlet. There are a third backflow valve and a fourth backflow valve, and the second backflow pipeline is provided with a fifth backflow valve. The first return valve controls the flow rate and flow rate of the liquid in the spherical tank, and the second return valve is close to the monomer delivery valve. The third return valve and the fourth return valve control the flow rate and flow rate of the pumped vinyl chloride monomer into the heat exchanger.

Preferably, the first return pipeline is also provided with a branch line, and the branch line leads to the polymerization tank. The vinyl chloride monomer pumped from the spherical tank is divided into two parts in the first return pipeline, most of which flow into the polymerization tank through the branch pipeline for polymerization reaction, and a small part flows into the heat exchanger and the waste water in the heat exchanger Carry out heat exchange and return to the spherical tank to slow down the occurrence of self-aggregation.

Preferably, the branch pipeline is arranged between the third backflow valve and the fourth backflow valve. Before the branch pipeline, the third return valve can control the diversion of the pumped vinyl chloride monomer in the branch pipeline and the second return pipeline, and the fourth return valve controls the flow rate and flow rate of the divided vinyl chloride monomer into the heat exchanger. flow rate.

Preferably, the first waste water pipe is provided with a first drain valve and an automatic regulating valve, and the second waste water pipe is provided with a second drain valve. The automatic regulating valve can control the flow and flow rate of waste water discharge, and control the degree of heat exchange.

Preferably, the waste water tank leads to the polymerization waste water stripping tower through a third waste water pipeline, and a third drain valve is arranged on the third waste water pipeline. The wastewater in the wastewater tank finally enters the polymerization wastewater stripping tower for stripping to improve the recovery and utilization of wastewater.

Preferably, a second exhaust port is provided on the top of the waste water tank, and the second exhaust port communicates with the first exhaust pipe through a second exhaust pipe. The waste water of the mobile phone in the waste water tank also has the situation of vaporization of vinyl chloride monomer, wherein the vaporized vinyl chloride monomer flows back through the second exhaust pipe and the first exhaust pipe, and is jointly transported to the gas cabinet for recovery.

Preferably, the first exhaust pipe and the second exhaust pipe are respectively provided with a first exhaust valve and a second exhaust valve. The first exhaust valve and the second exhaust valve control the flow rate and flow rate of the vaporized vinyl chloride monomer in the first exhaust pipeline and the second exhaust pipeline into the gas cabinet.

Compared with the prior art, the utility model has the following advantages:

The device for preventing self-polymerization of vinyl chloride monomer provided by the utility model mainly includes two parts: a return system and a waste discharge system. The vinyl chloride monomer pumped from the spherical tank is passed into the shell through the first return pipe, and then It flows through the inside of the body and returns to the spherical tank through the second return pipe, and at the same time, the waste water discharged from the spherical tank is passed into the heat exchange tube through the first waste water pipe, and the waste water flows through the heat exchange tube and then passes through the second waste water pipe. 2. The waste water pipeline flows into the waste water tank, or the waste discharge system is first opened to discharge the waste water, and then the return system is opened.

When the wastewater flows through the heat exchange tube, that is, through the tube side of the heat exchanger, the vinyl chloride monomer contained in the wastewater vaporizes, taking away a large amount of heat, so that the temperature of the wastewater in the heat exchange tube decreases rapidly, and the chlorine pumped from the spherical tank When the ethylene monomer fluid passes through the shell side of the heat exchanger (that is, the gap between the shell of the heat exchanger body and the heat exchange tube), the vinyl chloride monomer contacts the heat exchange tube and exchanges with the low-temperature wastewater in the heat exchange tube. Heat, reduce the temperature of the vinyl chloride monomer in the shell side, and finally return to the spherical tank through the second return pipe, and use heat energy exchange to realize the cooling of the reflux circulating vinyl chloride monomer. The circulating fluidity of the vinyl chloride monomer in the spherical tank is increased by reflux, and at the same time, the vinyl chloride monomer after heat exchange enters the spherical tank to lower the temperature, further slowing down the self-polymerization of the vinyl chloride monomer. Therefore, the device and method provided by the utility model have realized the mitigation effect of vinyl chloride monomer self-polymerization in three aspects: the bottom of the spherical tank is drained to the waste water tank, and the water content of vinyl chloride monomer in the spherical tank is controlled; the chlorine in the spherical tank is increased; Circulation of ethylene monomer; reflux part of the vinyl chloride monomer, exchange heat with waste water, and reduce the ambient temperature in the spherical tank. While slowing down the self-polymerization of vinyl chloride monomer, it can also effectively recycle waste water and maximize the thermal effect of waste water.

Description of drawings

Fig. 1 is a structural representation of a device for slowing down the self-polymerization of vinyl chloride monomer in the utility model;

Reference signs:

1-spherical tank, 2-heat exchanger, 201-body, 202-bottom head, 203-upper head, 3-wastewater tank,

4-first return pipe, 5-second return pipe, 6-first waste water pipe, 7-second waste water pipe,

8-first exhaust pipe, 9-branch pipeline, 10-polymerization wastewater stripping tower, 11-gas cabinet, 12-polymerization kettle,

13- monomer transfer pump, 14- the first backflow valve, 15- the second backflow valve, 16- the third backflow valve,

17-the fourth backflow valve, 18-the fifth backflow valve, 19-the second exhaust pipe, 20-the first drain valve,

21-automatic regulating valve, 22-second drain valve, 23-third drain valve, 24-first exhaust valve,

25 - Second exhaust valve.

detailed description

In order to make the purpose and technical solution of the embodiment of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the embodiment of the utility model.

In the description of the present application, it is to be understood that the terms "length", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, use a specific Azimuth configuration and operation, therefore, should not be construed as limiting the application.

As shown in Figure 1, the utility model provides a device for slowing down the self-polymerization of vinyl chloride monomer,

It includes a spherical tank 1, a heat exchanger 2 and a waste water tank 3; the spherical tank 1 is a large-capacity, pressure-bearing spherical storage container, and a large amount of liquid containing vinyl chloride monomer is stored in the spherical tank 1.

The heat exchanger 2 includes an upper head 203, a body 201 and a lower head 202 that are hermetically connected to each other. The upper head 203 and the body 201, and the lower head 202 and the body 201 are all sealed to ensure fluid flow. Leakage will not occur, the body 201 includes a shell and several heat exchange tubes arranged inside; the heat exchange tubes are generally uniformly arranged, and there is a certain gap between two adjacent heat exchange tubes, or all the heat exchange tubes The outer walls are tangent to each other and tightly connected; there is a certain gap between the shell and the heat exchange tube for fluid flow.

The bottom of the spherical tank 1 is provided with a first monomer reflux outlet, a waste water outlet and a first monomer reflux inlet, wherein the waste water outlet is located directly below the spherical tank 1, the first monomer reflux outlet and the first monomer The backflow inlets are respectively arranged on both sides or the same side of the waste water outlet.

A second monomer return outlet and a second monomer return inlet are respectively provided above and below the housing, and the second monomer return outlet and the second monomer return inlet lead to the shell of the heat exchanger 2 Inside the body, the first monomer reflux outlet communicates with the second monomer reflux inlet through a first reflux pipe 4; the second monomer reflux outlet communicates with the first monomer reflux inlet Connected through the second return pipe. There is a certain gap between the shell and the heat exchange tube, and the first return pipe 4 is provided with a monomer delivery pump 13; the monomer delivery pump 13 can transport the vinyl chloride monomer in the spherical tank 1, and the monomer delivery pump 13 The concentration of vinyl chloride monomer at the outlet is extremely high, which can reach more than 99.99%. A first return valve 14 and a second return valve 15 are sequentially provided between the first return outlet and the monomer delivery pump 13, and a first return valve 14 and a second return valve 15 are sequentially provided between the unit delivery pump 13 and the second monomer return inlet. A third return valve 16 and a fourth return valve 17 are provided, and the second return pipeline 5 is provided with a fifth return valve 18 . The first backflow valve 14 controls the flow rate and flow rate of the liquid in the spherical tank 1, and the second backflow valve 15 is close to the monomer delivery valve; the third backflow valve 16 and the fourth backflow valve 17 control the pumped vinyl chloride monomer into the exchange valve. The flow rate and flow rate of the heat exchanger 2; the fifth return valve 18 can control the flow rate and flow rate of the vinyl chloride monomer entering the spherical tank 1 after heat exchange from the inside of the heat exchanger 2. The vinyl chloride monomer pumped out from the spherical tank 1 is passed into the shell through the first return pipe 4, and then flows through the inside of the body 201, specifically, flows through the inner shell side of the heat exchanger 2 (that is, the shell body and the gap between the heat exchange tubes) and then return to the spherical tank 1 through the second return pipe 5. Part of the monomer circulation is completed by means of the monomer delivery pump 13, without adding another piece of equipment.

The upper head 203 is provided with a waste water inlet, and the waste water outlet is connected to the waste water inlet through the first waste water pipe 6; the bottom of the lower head 202 is provided with a waste water outlet, and the waste water outlet passes through the The second waste water pipeline 7 communicates with the waste water tank 3 . The first waste water pipe 6 is provided with a first drain valve 20 and an automatic regulating valve 21, and the second waste water pipe 7 is provided with a second drain valve 22. The automatic regulating valve 21 can control the flow and flow velocity of waste water discharge, and the second drain valve 22 controls the flow and flow velocity of waste water entering the waste water tank 3 from the heat exchanger 2. The vinyl chloride monomer discharged from the spherical tank 1 flows through the inner tube of the heat exchanger 2 and then flows into the waste water tank 3; the waste water discharged from the spherical tank 1 passes through the first waste water pipe 6 into the heat exchange tube , the waste water flows through the heat exchange tubes and then flows into the waste water tank 3 through the second waste water pipeline 7 .

The flow mode of the above-mentioned waste water in the heat exchanger 2 is up and down; in addition, the waste water inlet and the waste water outlet can also be respectively arranged on the lower head 202 and the upper head 203, and the direction of the actual waste water flowing through the heat exchange tube It can also be used for bottom in and top out. Therefore, the direction of the waste water flowing through the heat exchange tubes is selected according to the positions of the waste water inlet and the waste water outlet in two ways: up-in and down-out or down-in and up-out.

When the waste water flows through the heat exchange tube, that is, through the tube side of the heat exchanger 2 (that is, flows through the heat exchange tube), the vinyl chloride monomer contained in the waste water is vaporized, and a large amount of heat is taken away, so that the temperature of the waste water in the heat exchange tube is rapidly reduced , when the vinyl chloride monomer fluid pumped out from the spherical tank 1 passes through the shell side of the heat exchanger 2 (that is, flows through the gap between the shell of the heat exchanger 2 body 201 and the heat exchange tube), the vinyl chloride monomer Contact the heat exchange tube, exchange heat with the low-temperature wastewater in the heat exchange tube, reduce the temperature of the vinyl chloride monomer in the shell side, and finally return to the spherical tank 1 through the second return pipe 5, and realize the reflux cycle of vinyl chloride by heat energy exchange Monomer cooling. The circulating fluidity of the vinyl chloride monomer in the spherical tank 1 is increased by reflux, and at the same time, the heat-exchanged vinyl chloride monomer enters the spherical tank 1 to lower the internal ambient temperature of the spherical tank 1 and further slow down the self-polymerization of the vinyl chloride monomer.

The top of the heat exchanger 2 is provided with a first exhaust port, and the first exhaust port leads to the gas cabinet 11 through the first exhaust pipeline 8, and the first exhaust pipeline 8 is provided with a first exhaust valve 24 The vinyl chloride monomer vaporized during the process of the waste water flowing through the heat exchange tubes can be led to the gas cabinet 11 through the first exhaust pipe 8 for recovery. The top of the waste water tank 3 is provided with a second exhaust port, and the second exhaust port communicates with the first exhaust pipe 8 through a second exhaust pipe 19 . The second exhaust pipe 19 is provided with a second exhaust valve 25, and the waste water of the mobile phone in the waste water tank 3 also has the situation of vaporization of vinyl chloride monomer, wherein the vaporized vinyl chloride monomer passes through the second exhaust pipe 19 and the first exhaust pipe. An exhaust pipe 8 is returned, and is jointly transported to the gas cabinet 11 for recovery. The first exhaust valve 24 and the second exhaust valve 25 control the flow and flow rate of the vaporized vinyl chloride monomer in the first exhaust pipeline 8 and the second exhaust pipeline 19 entering the gas cabinet 11.

The waste water tank 3 leads to the polymerization waste water stripping tower 10 through the third waste water pipe, and the third waste water pipe is provided with a third drain valve 23 . The waste water in the waste water tank 3 finally enters the polymerization waste water stripping tower 10 for stripping, so as to improve the waste water recovery rate and utilization rate. While slowing down the self-polymerization of vinyl chloride monomer, it can also effectively recycle waste water and maximize the thermal effect of waste water.

The first return pipeline 4 is also provided with a branch pipeline 9 , which leads to the subsequent main reaction stage, and the branch pipeline 9 leads to the polymerization tank 12 . The vinyl chloride monomer pumped out from the spherical tank 1 is divided into two parts in the first return pipeline 4, most of which enter the polymerization kettle 12 through the branch pipeline 9 for polymerization reaction, and a small part flows into the heat exchanger 2, and passes through the The two shell sides of the heat exchanger exchange heat with the cooled waste water passing through the tube side, thereby reducing the temperature of the refluxed vinyl chloride monomer. And reflow to the spherical tank 1 through the heat exchanger 2, so that the average temperature in the spherical tank 1 drops, and strengthens the circulation flow of the vinyl chloride monomer at the bottom of the spherical tank 1, thereby slowing down the self-polymerization of the vinyl chloride monomer, which is conducive to improving Improve the quality of vinyl chloride products, delay the blockage of equipment pipelines and reduce system resistance, etc.

The branch pipeline 9 is arranged between the third backflow valve 16 and the fourth backflow valve 17 . Before the branch pipeline 9, the third backflow valve 16 can control the split flow of the pumped vinyl chloride monomer in the branch pipeline 9 and the second backflow pipeline 5, and the fourth backflow valve 17 controls the split flow of the vinyl chloride monomer into the exchange. Heater 2 flow and velocity. The third backflow valve 16 and the fourth backflow valve 17 can control the amount of vinyl chloride monomer that is backflowed.

Utilize above-mentioned device to also provide a kind of method that slows down the self-polymerization of vinyl chloride monomer, comprise the following steps:

Step 1, the waste water in the spherical tank 1 is passed into the heat exchange tube of the heat exchanger 2 through the first waste water pipeline 6, and flows through the heat exchange tube, and the residual vinyl chloride monomer in the waste water is vaporized, so that the waste water and heat exchange The tube is cooled, and then flows into the waste water tank 3 through the second waste water pipe 7; when the waste water flows through the heat exchange tube, a part of the vaporized residual vinyl chloride monomer is discharged into the gas cabinet 11, and the other part flows into the waste water tank together with the waste water 3, the vaporized residual vinyl chloride monomer in the waste water tank 3 is discharged into the gas cabinet 11, and the waste water flows into the polymerization waste water stripping tower 10.

Step 2. The vinyl chloride monomer in the spherical tank 1 is introduced into the body 201 of the heat exchanger 2 through the monomer delivery pump 13. and the reaction vinyl chloride monomer, the reflux vinyl chloride monomer enters the body 201 of the heat exchanger 2, flows through the gap between the shell of the body 201 and the heat exchange tube, and communicates with the heat exchanger The waste water in the heat pipe exchanges heat to reduce the temperature of the vinyl chloride monomer; the reaction vinyl chloride monomer is passed into the polymerization kettle 12;

Step 3, the cooled vinyl chloride monomer is returned to the spherical tank 1 through the second return pipe 5 .

The device for preventing the self-polymerization of vinyl chloride monomer provided by the utility model can be divided into two parts: a return system and a waste discharge system. The vinyl chloride monomer pumped from the spherical tank 1 is passed into the shell through the first return pipe 4 , and then flow through the inside of the body 201 and then return to the spherical tank 1 through the second return pipe 5, while the waste water discharged from the spherical tank 1 is passed into the heat exchange tube through the first waste water pipe 6, and the waste water flows After passing through the heat exchange tube, it flows into the waste water tank 3 through the second waste water pipe 7, or the waste discharge system is first opened to discharge the waste water, and then the backflow system is opened. The mitigation effect of vinyl chloride monomer self-polymerization has been realized in three aspects: the bottom of the spherical tank 1 is drained to the waste water tank 3, and the water content of the vinyl chloride monomer in the spherical tank 1 is controlled; the circulation of the vinyl chloride monomer in the spherical tank 1 is increased Flow; part of the vinyl chloride monomer is refluxed to exchange heat with the waste water to reduce the ambient temperature in the spherical tank 1 .

The above are only some implementations of the utility model, and its description is more specific and detailed, but it should not be interpreted as limiting the scope of the utility model patent. It should be pointed out that for those of ordinary skill in the art Under the premise of departing from the concept of the present utility model, several modifications and improvements can be made, and these obvious replacement forms all belong to the protection scope of the present utility model.

Claims (10)

1. A device for slowing down the self-polymerization of vinyl chloride monomer, characterized in that: it comprises a spherical tank, a heat exchanger and a waste water tank; The heat exchanger includes an upper head, a body and a lower head that are sealed and connected to each other, and the body includes a shell and several heat exchange tubes arranged inside; The spherical tank is provided with a first monomer reflux outlet, a waste water outlet and a first monomer reflux inlet, The first monomer reflux outlet leads into the housing through a first reflux pipe, and the first monomer reflux inlet communicates with the housing through a second reflux pipe; There is a single delivery pump; The waste water discharge port leads into the heat exchange tube through the first waste water pipe, and the heat exchange pipe communicates with the waste water tank through the second waste water pipe; A first exhaust port is provided on the top of the heat exchanger, and the first exhaust port leads to the gas cabinet through a first exhaust pipe. 2. A kind of device that slows down vinyl chloride monomer self-polymerization as claimed in claim 1, is characterized in that: A second monomer reflux outlet and a second monomer reflux inlet are respectively provided above and below the housing, and the first monomer reflux outlet and the second monomer reflux inlet pass through the first reflux The pipes are connected; the second monomer return outlet is connected with the first monomer return inlet through the second return pipe. 3. A kind of device that slows down vinyl chloride monomer self-polymerization as claimed in claim 2, is characterized in that: The upper head is provided with a waste water inlet, and the waste water outlet is connected to the waste water inlet through the first waste water pipe; the bottom of the lower head is provided with a waste water outlet, and the waste water outlet passes through the second waste water The pipeline communicates with the waste water tank. 4. a kind of device that slows down vinyl chloride monomer autopolymerization as described in claim 2, it is characterized in that: A first return valve and a second return valve are sequentially provided between the first return outlet and the monomer delivery pump, and a third return valve is provided sequentially between the unit delivery pump and the second monomer return inlet. A backflow valve and a fourth backflow valve, the second backflow pipeline is provided with a fifth backflow valve. 5. a kind of device that slows down vinyl chloride monomer autopolymerization as described in claim 4, it is characterized in that: A branch pipeline is also provided on the first return pipeline, and the branch pipeline leads to the polymerization kettle. 6. A device for slowing down the self-polymerization of vinyl chloride monomer as claimed in claim 5, characterized in that: The branch pipeline is arranged between the third backflow valve and the fourth backflow valve. 7. A kind of device that slows down vinyl chloride monomer self-polymerization as claimed in claim 1, is characterized in that: The first waste water pipe is provided with a first drain valve and an automatic regulating valve, and the second waste water pipe is provided with a second drain valve. 8. A kind of device that slows down vinyl chloride monomer self-polymerization as claimed in claim 1, is characterized in that: The waste water tank leads to the polymerization waste water stripping tower through the third waste water pipe, and the third waste water pipe is provided with a third drain valve. 9. A device for slowing down the self-polymerization of vinyl chloride monomer as claimed in claim 1, characterized in that: The top of the waste water tank is provided with a second exhaust port, and the second exhaust port communicates with the first exhaust pipe through a second exhaust pipe. 10. A device for slowing down the self-polymerization of vinyl chloride monomer as claimed in claim 9, characterized in that: the first exhaust pipe and the second exhaust pipe are respectively provided with a first exhaust valve and a Second exhaust valve.

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