VCM hot water waste heat utilization system

Abstract

The utility model provides a VCM hot water waste heat utilization system, and belongs to the technical field of heat recycling devices, the system comprises a first flow path and a second flow path, both the first flow path and the second flow path are provided with regulating valves, and the first flow path comprises a first water tank, a first water pump and a heat exchanger which are circularly connected; the second flow path comprises a second water tank, a second water pump, the heat exchanger, a third water tank and a third water pump which are connected in sequence; and the VCM hot water in the first flow path and the brine in the second flow path are subjected to heat interaction through the heat exchanger. The system can solve the problems of high energy consumption and low heat utilization rate in the chlor-alkali chemical production process, the effective utilization of heat in the production system is improved, and the energy consumption is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat recovery and utilization devices, and specifically relates to a VCM hot water waste heat utilization system. Background Art

[0002] The chlor-alkali industry is an industry that produces chlorine and sodium hydroxide by electrolyzing saturated salt water with inert electrodes. Sodium chloride solution is electrolyzed to produce sodium hydroxide, chlorine and hydrogen. Chlorine and hydrogen are burned in the synthesis workshop to produce hydrogen chloride, which is transported to the vinyl chloride (VCM) monomer workshop and synthesized with acetylene to produce vinyl chloride monomer for sale as a product, and can also be used as a raw material for polyvinyl chloride. A large amount of heat energy is generated during the production of vinyl chloride, which needs to be converted into hot water for recovery, and the waste heat is mostly used for lithium bromide refrigeration.

[0003] At the same time, in the chlor-alkali chemical production process, the traditional brine heating method usually uses steam or electric heating, which not only has high energy consumption but also has low heat utilization rate.

[0004] On the one hand, the vinyl chloride production process needs to recover waste heat, and on the other hand, the brine process needs to be heated. How to efficiently utilize the VCM hot water waste heat, reduce energy consumption, and improve heat utilization is a problem that needs to be solved urgently. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the above difficulties and provide a VCM hot water waste heat utilization system to solve the problems of high energy consumption and low heat utilization rate in the chlor-alkali chemical production process, improve the effective utilization of heat in the production system and reduce energy consumption.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A VCM hot water waste heat utilization system comprises a first flow path and a second flow path, wherein both the first flow path and the second flow path are provided with regulating valves, wherein the first flow path comprises a first water tank, a first water pump and a heat exchanger which are cyclically connected; wherein the second flow path comprises a second water tank, a second water pump, the heat exchanger, a third water tank and a third water pump which are sequentially connected; and wherein the VCM hot water in the first flow path and the brine in the second flow path perform thermal interaction through the heat exchanger.

[0008] Furthermore, the VCM hot water waste heat utilization system also includes a control system, and the control system is electrically connected to the regulating valve.

[0009] Furthermore, the heat exchanger includes a first inlet end, a second inlet end, a first outlet end and a second outlet end, the first inlet end is connected to the first water pump, and the first outlet end is connected to the first water tank; the second inlet end is connected to the second water pump, and the second outlet end is connected to the third water tank.

[0010] Furthermore, the regulating valve includes a first regulating valve, which is arranged between the first inlet end and the first water pump, and a first temperature sensor is also arranged between the second outlet end and the third water tank, and the first regulating valve and the first temperature sensor are both electrically connected to the control system.

[0011] Furthermore, a flow sensor is provided between the first regulating valve and the first water tank, and the flow sensor is electrically connected to the control system.

[0012] Furthermore, the regulating valve also includes a cut-off valve, which is arranged between the first outlet end and the first water tank. An online pH meter, a conductivity meter and a second temperature sensor are also arranged between the first outlet end and the first water tank. The online pH meter, the conductivity meter, the second temperature sensor and the cut-off valve are all electrically connected to the control system.

[0013] Furthermore, the first water pump, the second water pump, and the third water pump are all electrically connected to the control system.

[0014] Furthermore, the regulating valve also includes a second regulating valve, the second water tank is connected to the third water pump via a branch, and the second regulating valve is arranged on the branch.

[0015] Furthermore, a third regulating valve is provided between the second water tank and the second water pump, between the second water pump and the heat exchanger, and between the third water tank and the third water pump.

[0016] Furthermore, the second water tank is connected to a water source, and the third water pump is connected to a salt tank.

[0017] Furthermore, the heat exchanger is a shell and tube heat exchanger, including a shell side and a tube side, the shell side and the tube side are not connected to each other, the brine flows through the tube side, and the VCM hot water flows through the shell side, and heat exchange occurs during the flow process.

[0018] The working process and principle of the utility model are:

[0019] 1. Store hot and cold saline water in separate tanks. The heated saline water is stored in the third tank, and the cold water is stored in the second tank. When the saline water in the system decreases, a small amount of cold water is added. By storing in separate tanks, the second tank maintains a low liquid level while ensuring production load.

[0020] 2. The VCM hot water in the first flow path heats the salt water in the second flow path. The heated salt water is sent to the third water tank for storage and finally transported to the salt pool for salt treatment.

[0021] 3. An online flow sensor is provided on the pipeline between the first inlet end of the heat exchanger and the first water tank, and a first temperature sensor is provided on the second outlet end of the heat exchanger. The control system can obtain the temperature of the brine at the second outlet end of the heat exchanger through the first temperature sensor, and control the first regulating valve to control the flow of VCM hot water, so as to keep the temperature of the brine stable.

[0022] 4. An online pH meter, conductivity meter and second temperature sensor are installed on the pipeline between the first outlet of the heat exchanger and the first water tank, and preset values ​​of pH value, conductivity and temperature are set in the control system. When any one of the indicators of pH value, conductivity and temperature reaches the preset value, the control system executes the interlocking procedure, closes the first regulating valve, closes the cut-off valve, and stops supplying VCM hot water in the first flow path; turns off the second water pump, and the second water tank stops supplying water to the heat exchanger; opens the second regulating valve, and the salt water is transported to the water source, the second water tank, the third water pump, and the salt water tank in the order of the salt water, and the third water tank can also be replenished with salt water.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] 1. Using VCM hot water to heat the brine effectively utilizes the waste heat of VCM hot water and reduces energy consumption;

[0025] 2. The salt water is stored in different tanks through the second and third tanks, and the unheated water and the heated water are distinguished, so that the temperature of the salt water is more stable;

[0026] 3. By collecting the temperature of the brine and controlling the flow of VCM hot water through the control system, the temperature of the brine flowing out of the heat exchanger remains stable;

[0027] 4. Add online monitoring equipment such as online pH meter, conductivity meter, second temperature sensor, etc. in the first flow path, and set preset values. When abnormalities occur in pH value, conductivity, temperature, etc., start the interlocking program and directly transport the brine from the second water tank to the brine pool, so as to realize real-time monitoring of the heat utilization process and timely handling of abnormal situations, thereby improving the safety and stability of production. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The utility model is a schematic diagram of the overall structure of an embodiment.

[0029] The parts represented by the reference numerals in the figure are listed as follows:

[0030] 1-first water tank, 2-first water pump, 3-heat exchanger, 301-first inlet end, 302-second inlet end, 303-first outlet end, 304-second outlet end, 4-second water tank, 5-second water pump, 6-third water tank, 7-third water pump, 8-first regulating valve, 9-first temperature sensor, 10-flow sensor, 11-online pH meter, 12-conductivity meter, 13-second temperature sensor, 14-cut-off valve, 15-second regulating valve, 16-third regulating valve, 17-water source, 18-salination tank. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0035] Example 1

[0036] As attached Figure 1 As shown, this embodiment provides the following technical solutions:

[0037] A VCM hot water waste heat utilization system comprises a first flow path and a second flow path, wherein both the first flow path and the second flow path are provided with regulating valves, wherein the first flow path comprises a first water tank 1, a first water pump 2 and a heat exchanger 3 which are cyclically connected; wherein the second flow path comprises a second water tank 4, a second water pump 5, the heat exchanger 3, a third water tank 6 and a third water pump 7 which are sequentially connected; and wherein the VCM hot water in the first flow path and the brine in the second flow path perform thermal interaction through the heat exchanger 3.

[0038] By controlling the opening and closing of the regulating valve, the on-off of the first flow path and the second flow path and the flow rate of the medium passing through the flow paths can be controlled.

[0039] The regulating valve and the water pump can be manually controlled to adjust the flow ratio of the medium in the first flow path and the second flow path so that the temperature of the brine meets the expectations, or they can be automatically controlled by a control system to reduce manual work.

[0040] In some preferred embodiments of the present invention, the VCM hot water waste heat utilization system also includes a control system, and the control system is electrically connected to the regulating valve. It should be noted that controlling the regulating valve by a control system is a mature technical application and is not the focus of the present invention. Therefore, the present invention omits the specific principles and structural forms of the control system.

[0041] Furthermore, the heat exchanger 3 includes a first inlet end 301, a second inlet end 302, a first outlet end 303 and a second outlet end 304, the first inlet end 301 is connected to the first water pump 2, and the first outlet end 303 is connected to the first water tank 1; the second inlet end 302 is connected to the second water pump 5, and the second outlet end 304 is connected to the third water tank 6.

[0042] Furthermore, a first regulating valve 8 is provided between the first inlet port 301 and the first water pump 2, and a first temperature sensor 9 is provided between the second outlet port 304 and the third water tank 6. Both the first regulating valve 8 and the first temperature sensor 9 are electrically connected to the control system.

[0043] Furthermore, a flow sensor 10 is provided between the first regulating valve 8 and the first water tank 1 , and the flow sensor 10 is electrically connected to the control system.

[0044] Furthermore, an online pH meter 11, a conductivity meter 12, a second temperature sensor 13 and a shut-off valve 14 are sequentially arranged between the first outlet port 303 and the first water tank 1, and the online pH meter 11, the conductivity meter 12, the second temperature sensor 13 and the shut-off valve 14 are all electrically connected to the control system.

[0045] Furthermore, the first water pump 2 , the second water pump 5 , and the third water pump 7 are all electrically connected to the control system.

[0046] Furthermore, the second water tank 4 is connected to the third water pump 7 via a branch line, and a second regulating valve 15 is provided on the branch line.

[0047] Furthermore, the second water tank is connected to a water source, and the third water pump is connected to a salt tank.

[0048] Example 2

[0049] The difference from Example 1 is that the heat exchanger is a shell and tube heat exchanger, including a shell side and a tube side, the shell side and the tube side are not connected to each other, the brine flows through the tube side, and the VCM hot water flows through the shell side, and thermal interaction occurs during the flow process.

[0050] Example 3

[0051] The difference from Example 1 is that a third regulating valve 16 is provided between the second water tank 4 and the second water pump 5, between the second water pump 5 and the heat exchanger 3, between the third water tank 6 and the third water pump 7, and between the third water pump 7 and the salt tank.

[0052] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model are included in the protection scope of the utility model.

Claims

1. A VCM hot water waste heat utilization system, Features: The invention comprises a first flow path and a second flow path, wherein the first flow path and the second flow path are both provided with regulating valves, the first flow path comprises a first water tank, a first water pump and a heat exchanger which are cyclically connected; the second flow path comprises a second water tank, a second water pump, the heat exchanger, a third water tank and a third water pump which are sequentially connected; the VCM hot water in the first flow path and the brine in the second flow path perform thermal interaction through the heat exchanger.

2. The VCM hot water waste heat utilization system according to claim 1, Features: Also included is a control system, which is electrically connected to the regulating valve.

3. The VCM hot water waste heat utilization system according to claim 2, Features: The heat exchanger includes a first inlet end, a second inlet end, a first outlet end, and a second outlet end. The first inlet end is connected to the first water pump, and the first outlet end is connected to the first water tank; the second inlet end is connected to the second water pump, and the second outlet end is connected to the third water tank.

4. The VCM hot water waste heat utilization system according to claim 3, Features: The regulating valve includes a first regulating valve, which is arranged between the first inlet end and the first water pump. A first temperature sensor is also arranged between the second outlet end and the third water tank. The first regulating valve and the first temperature sensor are both electrically connected to the control system.

5. The VCM hot water waste heat utilization system according to claim 4, Features: A flow sensor is also provided between the first regulating valve and the first water tank, and the flow sensor is electrically connected to the control system.

6. The VCM hot water waste heat utilization system according to claim 4, Features: The regulating valve also includes a cut-off valve, which is arranged between the first outlet end and the first water tank. An online pH meter, a conductivity meter and a second temperature sensor are also arranged between the first outlet end and the first water tank. The online pH meter, the conductivity meter, the second temperature sensor and the cut-off valve are all electrically connected to the control system.

7. The VCM hot water waste heat utilization system according to claim 2, Features: The first water pump, the second water pump, and the third water pump are all electrically connected to the control system.

8. The VCM hot water waste heat utilization system according to claim 1, Features: The regulating valve further includes a second regulating valve. A branch is connected between the second water tank and the third water pump, and the second regulating valve is arranged on the branch.

9. The VCM hot water waste heat utilization system according to claim 1, Features: The regulating valve further includes a third regulating valve, and the third regulating valve is arranged between the second water tank and the second water pump, between the second water pump and the heat exchanger, and between the third water tank and the third water pump.

10. The VCM hot water waste heat utilization system according to claim 1, Features: The second water tank is connected to a water source, and the third water pump is connected to a salt tank.

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