Waste gas recovery system for ABS (Acrylonitrile Butadiene Styrene) resin production

Abstract

The utility model discloses a waste gas recovery system for ABS (Acrylonitrile Butadiene Styrene) resin production and belongs to the technical field of waste gas treatment. The waste gas recovery system comprises a condenser, a monomer separation tank and a waste gas fan, wherein the condenser comprises a shell, a first tube box, a second tube box, a first tube plate, a second tube plate, a heat exchange tube and a condensate tube. According to the system disclosed by the utility model, the gas inlet of the condenser is connected with the exhaust port of the condensation kettle through the pipeline, the gas outlet of the condenser is connected with the waste gas fan through the pipeline, and the condensate outlet of the condenser is connected with the condensate inlet of the monomer separation tank through the pipeline, so that waste gas can be timely extracted from the condensation kettle under the action of the waste gas fan; the exhausted waste gas is condensed through a condenser, and liquid formed by condensation is separated and recycled through a monomer separation tank; the whole system is reasonable in structural design and convenient to operate, monomer waste is avoided, and environmental pollution caused by direct exhaust of waste gas is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, and in particular to a waste gas recovery system for ABS resin production. Background Art

[0002] ABS resin is prepared from three monomers: butadiene, styrene, and acrylonitrile. Due to its excellent performance and wide application, it has become an indispensable material for high-performance engineering plastics and general-purpose engineering resins. Currently, the emulsion grafting-bulk SAN blending method is commonly used to produce ABS resin. Because the conversion rate of monomers (such as styrene and acrylonitrile) during the emulsion grafting polymerization process is not 100%, the ABS emulsion exiting the reactor enters the coagulation reactor for high-temperature coagulation. During this high-temperature coagulation process, the monomers that are not converted into polymers evaporate and are discharged along with the water vapor as waste gas. This not only wastes monomers, but also seriously endangers human health and pollutes the environment.

[0003] Therefore, it is very necessary to design a waste gas recovery device for ABS resin production. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a waste gas recovery system for ABS resin production.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A waste gas recovery system for ABS resin production, comprising a condenser, a monomer separation tank and an exhaust gas blower, the condenser comprising a shell, a first pipe box, a second pipe box, a first tube sheet, a second tube sheet, a heat exchange tube and a condensate tube, the first pipe box and the second pipe box being located on both sides of the shell, a first tube sheet being provided between the first pipe box and the shell, a second tube sheet being provided between the second pipe box and the shell, the first tube sheet being provided with a communicating port and a first tube hole adapted for the heat exchange tube, the second tube sheet being provided with a second tube hole adapted for the heat exchange tube, one end of the heat exchange tube being inserted into the first tube hole, and the other end of the heat exchange tube being inserted into the second tube hole; the first pipe box being provided with a refrigerant inlet and a condensate outlet, the second pipe box being provided with a refrigerant outlet, the shell being provided with an air inlet and an air outlet, one end of the condensate tube being inserted into the communicating port, and the other end of the condensate tube being inserted into the condensate outlet;

[0007] The air inlet of the condenser is connected to the exhaust port of the condensation kettle through a pipeline, the air outlet of the condenser is connected to the exhaust gas fan through a pipeline, and the condensate outlet of the condenser is connected to the condensate inlet of the monomer separation tank through a pipeline.

[0008] Preferably, a drain outlet is provided at the bottom of the monomer separation tank, and the monomer separation tank is provided with a recovery port.

[0009] Furthermore, the drain port of the monomer separation tank is connected to the water inlet of the coagulation kettle through a pipeline.

[0010] Preferably, at least two staggered guide plates are provided in the shell.

[0011] Preferably, the waste gas recovery system for ABS resin production further includes an explosion-proof pressure relief device, and the explosion-proof pressure relief device is connected in parallel with the condenser through a pipeline.

[0012] Preferably, the air outlet of the condenser is also connected to a backwash pump through a pipeline.

[0013] Preferably, there are no less than three heat exchange tubes and they are distributed at equal intervals.

[0014] Preferably, the heat exchange tube includes a first tube segment, a second tube segment and a third tube segment connected in sequence, the outer diameter of the first tube segment and the outer diameter of the third tube segment are both smaller than the outer diameter of the second tube segment, the first tube segment is inserted into the first tube hole, and the third tube segment is inserted into the second tube hole.

[0015] Further preferably, a first sealing ring is provided between an end surface of one end of the second pipe segment and the first tube sheet, and a second sealing ring is provided between the other end surface of the second pipe segment and the second tube sheet.

[0016] Preferably, the condensate pipe includes a first condensate pipe portion, a second condensate pipe portion and a third condensate pipe portion connected in sequence, the outer diameter of the first condensate pipe portion and the outer diameter of the third condensate pipe portion are both smaller than the second condensate pipe portion, the first condensate pipe portion is inserted into the condensate outlet, and the third condensate pipe portion is inserted into the connecting port.

[0017] Further preferably, a first sealing ring is provided between an end surface of one end of the second condensing pipe portion and the inner wall of the first pipe box, and a second sealing ring is provided between an end surface of the other end of the second condensing pipe portion and the first tube sheet.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The system of the utility model connects the air inlet of the condenser and the exhaust port of the condensation kettle through a pipeline, connects the air outlet of the condenser and the exhaust port of the condensation kettle through a pipeline, connects the air outlet of the condenser and the exhaust port of the condensation kettle through a pipeline, and connects the condensate outlet of the condenser and the condensate inlet of the monomer separation tank through a pipeline. Under the action of the exhaust gas fan, the exhaust gas can be extracted from the condensation kettle in time, the extracted exhaust gas is condensed by the condenser, and the liquid formed by the condensation is separated and recovered by the monomer separation tank; the structural design of the whole system is reasonable and the operation is convenient, which not only avoids monomer waste, but also avoids environmental pollution caused by direct discharge of exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the waste gas recovery system for ABS resin production provided by the utility model;

[0021] Figure 2 A schematic structural diagram of a condenser provided by the present utility model;

[0022] Figure 3 A schematic diagram of the installation of the heat exchange tube provided by the present invention;

[0023] Figure 4 This is a schematic diagram of the installation of the condensate pipe provided by the utility model.

[0024] In the figure, 1-condenser, 11-shell, 111-air inlet, 112-air outlet, 12-first pipe box, 121-refrigerant inlet, 122-condensate outlet, 13-second pipe box, 131-refrigerant outlet, 14-first tube sheet, 15-second tube sheet, 16-heat exchange tube, 161-first pipe section, 162-second pipe section, 163-third pipe section, 164-first sealing ring, 165-second sealing ring, 17-condensate pipe, 171-second condensate pipe section, 172-second condensate pipe section, 173-third condensate pipe section, 174-first sealing ring, 175-second sealing ring, 18-guide plate, 2-monomer separation tank, 3-exhaust fan, 4-explosion-proof pressure relief device, 5-backwash pump, 6-condensation kettle. DETAILED DESCRIPTION

[0025] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0026] See also Figures 1 to 4The utility model provides an exhaust gas recovery system for ABS resin production, including a condenser 1, a monomer separation tank 2 and an exhaust gas blower 3. The condenser 1 includes a shell 11, a first pipe box 12, a second pipe box 13, a first tube sheet 14, a second tube sheet 15, a heat exchange tube 16 and a condensate tube 17. The first pipe box 12 and the second pipe box 13 are located on both sides of the shell 11. The first tube sheet 14 is provided between the first pipe box 12 and the shell 11, and the second tube sheet 15 is provided between the second pipe box 13 and the shell 11. The first tube sheet 14 is provided with a communication port and a first tube hole adapted to the heat exchange tube 16. The second tube sheet 15 is provided with a second tube hole adapted to the heat exchange tube 16. One end of the heat exchange tube 16 is inserted into the first tube hole, and the other end of the heat exchange tube 16 is inserted into the second tube hole; the first tube box 12 is provided with a refrigerant inlet 121 and a condensate outlet 122, the second tube box 13 is provided with a refrigerant outlet 131, the shell 11 is provided with an air inlet 111 and an air outlet 112, one end of the condensate tube 17 is inserted into the connecting port, and the other end of the condensate tube 17 is inserted into the condensate outlet 122; the air inlet 111 of the condenser 1 is connected to the exhaust port of the condensation kettle 6 through a pipeline, the air outlet 112 of the condenser 1 is connected to the exhaust gas fan 3 through a pipeline, and the condensate outlet 122 of the condenser 1 is connected to the condensate inlet of the monomer separation tank 2 through a pipeline.

[0027] Under the action of the exhaust gas blower 3, the exhaust gas generated in the condensation kettle 6 is extracted and transported to the condenser 1 for condensation to form a condensate containing monomers and water. The condensate flows into the monomer separation tank 2 through a pipeline for collection. The condensate in the monomer separation tank 2 is allowed to stand and separate into layers. The lower aqueous phase can be returned to the condensation kettle 6 through a pipeline. The remaining organic phase mainly contains monomers, which can be used as a raw material for preparing ABS resin.

[0028] In one embodiment, a drain outlet is provided at the bottom of the monomer separation tank 2, and the monomer separation tank 2 is provided with a recovery port. The drain outlet of the monomer separation tank 2 is connected to the water inlet of the condensation kettle 6 through a pipe, and the recovery port of the monomer separation tank 2 is connected to a recovery pipe.

[0029] In one embodiment, at least two staggered guide plates 18 are provided in the housing 11. This structural design can prolong the residence time of the exhaust gas in the housing 11, thereby improving the condensation effect of the condenser 1.

[0030] In one embodiment, the waste gas recovery system for ABS resin production further includes an explosion-proof pressure relief device 4 , which is connected in parallel with the condenser 1 through a pipeline.

[0031] This utility model connects the condenser 1 and the alarm pressure relief device 4 in parallel via pipes, which are then connected to the exhaust blower 3. When the condenser 1 malfunctions and needs to be temporarily suspended, the valve on the pipe containing the alarm pressure relief device 4 can be opened, and the valve on the pipe containing the condenser 1 can be closed, allowing the exhaust gas to enter the exhaust gas treatment system directly. This prevents the condensation kettle 6 from experiencing a sudden increase in pressure due to the inability to discharge the exhaust gas in a timely manner, which could cause a safety accident. The design of connecting the condenser 1 and the alarm pressure relief device 4 in parallel via pipes offers a simple structure and flexible operation.

[0032] In one embodiment, the gas outlet 112 of the condenser 1 is further connected to the backwash pump 5 through a pipeline.

[0033] Since styrene and acrylonitrile monomers in exhaust gas easily self-polymerize to form homopolymers or copolymers at high temperatures, these substances easily adhere to the components in the shell 11, which can easily affect the condensation effect of the condenser 1. For this reason, the utility model connects the air outlet 112 of the condenser 1 to the backwash pump 5 through a pipeline. When it is necessary to clean the condenser 1, the valve on the pipeline between the exhaust gas blower 3 and the air outlet 112 of the condenser 1 is closed, and the backwash pump 5 is connected to the water tank through a pipeline. The backwash pump 5 is used to transport the desalted water in the water tank into the condenser 1 to clean the interior of the shell 11, and clean the substances attached to the inner wall of the shell 11, the guide plate 18, the heat exchange tube 16 and other parts. The waste liquid generated by the cleaning is discharged through the condensate pipe 17 and flows into the monomer separation tank 2 through the pipeline.

[0034] In one embodiment, there are no less than three heat exchange tubes 16 and they are distributed at equal intervals.

[0035] In one embodiment, the heat exchange tube 16 includes a first tube segment 161, a second tube segment 162, and a third tube segment 163 connected in sequence. The outer diameter of the first tube segment 161 and the outer diameter of the third tube segment 163 are both smaller than the outer diameter of the second tube segment 162. The first tube segment 161 is inserted into the first tube hole, and the third tube segment 163 is inserted into the second tube hole.

[0036] Specifically, the first pipe section 161 is sleeved with a first sealing ring 164, and the first sealing ring 164 is clamped between one end face of the second pipe section 162 and the first tube sheet 14. The third pipe section 163 is sleeved with a second sealing ring 165, and the second sealing ring 165 is clamped between the other end face of the second pipe section 162 and the second tube sheet 15.

[0037] The heat exchange tubes 16 and the tube sheets in the utility model have simple structures, are easy to assemble and disassemble, and have good sealing performance.

[0038] In one embodiment, the condensate pipe 17 includes a first condensate pipe portion 171, a second condensate pipe portion 172 and a third condensate pipe portion 173 connected in sequence. The outer diameter of the first condensate pipe portion 171 and the outer diameter of the third condensate pipe portion 173 are both smaller than the second condensate pipe portion 172. The first condensate pipe portion 171 is inserted into the condensate outlet 122, and the third condensate pipe portion 173 is inserted into the connecting port.

[0039] Specifically, the first condensation pipe section is provided with a first sealing ring 174, which is clamped between one end face of the second condensation pipe section 171 and the inner wall of the first pipe box 12; the third condensation pipe section 173 is provided with a second sealing ring 175, which is clamped between the other end face of the second condensation pipe section 172 and the first tube plate 14.

[0040] The condensate pipe 17 of the present invention has a simple structural design and is easy to install and disassemble.

[0041] In the present invention, the pipeline can be a single pipe, or can be formed by connecting multiple pipes in sequence through flange covers.

[0042] In the utility model, each pipeline is provided with a valve.

[0043] In the present invention, a temperature sensor is provided on the pipe connected to the air inlet 111 of the condenser 1 .

[0044] During actual application, the refrigerant inlet 121 is pre-connected with the refrigerant box through a pipeline, and the refrigerant outlet 131, the refrigerant delivery pump and the refrigerant box are connected through a pipeline, and the refrigerant box is filled with chilled water; under the action of the exhaust gas fan 3, the exhaust gas generated in the condensation process is quickly extracted from the condensation kettle 6, and the extracted exhaust gas enters the condenser 1 through the pipeline, and the temperature of the exhaust gas is generally above 100°C; at the same time, under the action of the refrigerant delivery pump, the refrigerant (such as chilled water with a temperature of 0-8°C) enters the condenser 1 through the refrigerant inlet 121, and the exhaust gas in the condenser 1 exchanges heat with the refrigerant in the heat exchange tube 16. The monomers (such as styrene, acrylonitrile) and water in the exhaust gas are cooled and condensed to form a liquid. The formed liquid is discharged through the condensate pipe 17 and flows into the monomer separation tank 2 through the pipeline; the uncondensed exhaust gas is discharged through the outlet 112 and input into the external exhaust gas treatment system through the pipeline and the exhaust gas fan 3 for treatment.

[0045] The liquid in the monomer separation tank 2 is separated into layers after standing. The aqueous phase in the lower layer can be returned to the coagulation kettle 6 through a pipeline. The remaining organic phase in the monomer separation tank 2 mainly consists of styrene and acrylonitrile monomers, which can be used to prepare ABS resin.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0047] In the description of the present invention, it should be understood that the terms "upper", "inner", "outer", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A waste gas recovery system for ABS resin production, characterized in that: The condenser comprises a shell, a first tube box, a second tube box, a first tube sheet, a second tube sheet, a heat exchange tube and a condensate tube. The first tube box and the second tube box are located on both sides of the shell. A first tube sheet is provided between the first tube box and the shell, and a second tube sheet is provided between the second tube box and the shell. The first tube sheet is provided with a connecting port and a first tube hole adapted for the heat exchange tube. The second tube sheet is provided with a second tube hole adapted for the heat exchange tube. One end of the heat exchange tube is inserted into the first tube hole, and the other end of the heat exchange tube is inserted into the second tube hole. The first tube box is provided with a refrigerant inlet and a condensate outlet, and the second tube box is provided with a refrigerant outlet. The shell is provided with an air inlet and an air outlet. One end of the condensate tube is inserted into the connecting port, and the other end of the condensate tube is inserted into the condensate outlet. The air inlet of the condenser is connected to the exhaust port of the condensation kettle through a pipeline, the air outlet of the condenser is connected to the exhaust gas fan through a pipeline, and the condensate outlet of the condenser is connected to the condensate inlet of the monomer separation tank through a pipeline.

2. The waste gas recovery system for ABS resin production according to claim 1, characterized in that: A drain port is provided at the bottom of the monomer separation tank, and a recovery port is provided at the monomer separation tank.

3. The waste gas recovery system for ABS resin production according to claim 1, characterized in that: At least two staggered guide plates are arranged in the shell.

4. The waste gas recovery system for ABS resin production according to claim 1, characterized in that: It also includes an explosion-proof pressure relief device, which is connected in parallel with the condenser through a pipeline.

5. The waste gas recovery system for ABS resin production according to claim 1, characterized in that: The air outlet of the condenser is also connected to a backwash pump through a pipeline.

6. The waste gas recovery system for ABS resin production according to claim 1, characterized in that: There are no less than three heat exchange tubes and they are distributed at equal intervals.

7. The waste gas recovery system for ABS resin production according to claim 1, characterized in that: The heat exchange tube includes a first tube segment, a second tube segment and a third tube segment connected in sequence. The outer diameters of the first tube segment and the third tube segment are both smaller than the outer diameter of the second tube segment. The first tube segment is inserted into the first tube hole, and the third tube segment is inserted into the second tube hole.

8. The waste gas recovery system for ABS resin production according to claim 7, characterized in that: A first sealing ring is provided between an end surface of one end of the second pipe section and the first tube sheet, and a second sealing ring is provided between the other end surface of the second pipe section and the second tube sheet.

9. The waste gas recovery system for ABS resin production according to claim 1, characterized in that: The condensate pipe includes a first condensate pipe portion, a second condensate pipe portion and a third condensate pipe portion connected in sequence. The outer diameter of the first condensate pipe portion and the outer diameter of the third condensate pipe portion are both smaller than the second condensate pipe portion. The first condensate pipe portion is inserted into the condensate outlet, and the third condensate pipe portion is inserted into the connecting port.

10. The waste gas recovery system for ABS resin production according to claim 9, characterized in that: A first sealing ring is provided between an end surface of one end of the second condensing pipe portion and the inner wall of the first pipe box, and a second sealing ring is provided between an end surface of the other end of the second condensing pipe portion and the first tube plate.

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