VCM hot water waste heat efficient utilization device

Abstract

The utility model provides a VCM hot water waste heat efficient utilization device, and relates to the technical field of chemical equipment, the VCM hot water waste heat efficient utilization device comprises a hot water tank of a VCM process and a brine tank of a brine heating process, the hot water tank is communicated with a hot water outlet pipeline, a water pump is installed at the joint of the hot water outlet pipeline and the hot water tank, and a first branch and a second branch are arranged on the hot water outlet pipeline. The branch I is a hot water pipeline for removing lithium bromide, and the branch II is a hot water loop pipeline and leads to a hot water tank; the brine tank is communicated with a brine pipeline, a first heat exchanger is connected to the brine pipeline in series, and the second branch is communicated with a heat medium pipeline of the first heat exchanger. A large amount of hot water waste heat generated in the VCM process can be effectively utilized in the salt water heating process, steam or electric energy heating is replaced or partially replaced, the utilization rate of heat energy resources is remarkably increased, energy consumption is reduced, and low carbon and environmental protection are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a VCM hot water waste heat efficient utilization device. Background Art

[0002] In the chlor-alkali chemical industry, especially in the production of VCM (vinyl chloride monomer), large amounts of hot water are often generated during conversion, which contains abundant waste heat resources. However, the current common practice is to use this waste heat primarily in lithium bromide refrigeration systems. Although it is recycled to a certain extent, its potential is not fully realized. In traditional brine heating processes, direct heating with steam or electricity is usually used. This method is not only energy-intensive and economically inefficient, but also has low heat utilization efficiency, resulting in high operating costs and a significant environmental impact. Utility Model Content

[0003] The purpose of this utility model is to provide a VCM hot water waste heat efficient utilization device, which utilizes the waste heat of hot water generated in the VCM process and realizes effective heating of brine by adding a new brine heat exchanger and a series of supporting regulating valves, shut-off valves, flow meters, online monitoring instruments and other equipment.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0005] A VCM hot water waste heat efficient utilization device comprises a hot water tank for the VCM process and a brine tank for the brine heating process, the hot water tank being connected to a hot water outlet pipe, a water pump being installed at the connection between the hot water outlet pipe and the hot water tank, a first branch and a second branch being provided on the hot water outlet pipe, the first branch being a hot water pipe for removing lithium bromide, the second branch being a hot water loop pipe, and the second branch leading to the hot water tank;

[0006] The brine tank is connected to a brine pipeline, a heat exchanger 1 is connected in series on the brine pipeline, and branch 2 is connected to the heat medium pipeline of the heat exchanger 1.

[0007] Furthermore: a regulating valve 1 is installed on branch 2 at the inlet of the heat medium pipeline, a brine thermometer 1 is installed on the brine pipeline connected to the outlet of the heat exchanger 1, and the regulating valve 1 and the brine thermometer 1 are connected through an electrical signal.

[0008] Furthermore: a branch three is provided on the hot water outlet pipe, the branch point of branch three is close to the water pump outlet, branch three is the outlet return pipe, leading to the hot water tank, and a regulating valve two is provided on branch three; a hot water pressure gauge is installed on branch two at the inlet of the heat medium pipe; the regulating valve two and the hot water pressure gauge are connected by an electrical signal.

[0009] Furthermore: a hot water thermometer 2 and a flow meter are installed on the second branch at the inlet of the heat medium pipeline.

[0010] Furthermore, a heat exchanger 2 is connected in series to the brine pipeline between the heat exchanger 1 and the brine tank. The heat source of the heat exchanger 2 is a steam medium, which is transported to the heat exchanger 2 through a steam pipeline.

[0011] Furthermore: a regulating valve 3 is installed on the steam pipe, a brine thermometer 2 is installed on the brine pipe connected to the outlet of the heat exchanger 2, and the regulating valve 3 and the brine thermometer 2 are connected through an electrical signal.

[0012] Furthermore: it also includes an interlocking control system, which is electrically connected to all the meters and valves in the device.

[0013] Furthermore: a pH meter, a hot water thermometer and a conductivity meter are installed on branch 2 connected to the outlet of the heat medium pipe of heat exchanger 1, and a brine concentration meter is installed on the brine pipe connected to the outlet of heat exchanger 1.

[0014] Furthermore: a hot water shut-off valve 1 is also installed on branch 2 connected to the outlet of the heat medium pipeline of heat exchanger 1; a brine shut-off valve 1 and a brine shut-off valve 2 are installed on the brine pipeline, and the brine shut-off valve 1 and the brine shut-off valve 2 are respectively located at the inlet and outlet of heat exchanger 1.

[0015] Furthermore: a brine bypass is provided on the brine pipeline, the brine bypass is connected in parallel with the brine cut-off valve 1, the heat exchanger 1, the brine cut-off valve 2, and the brine concentration meter, and a brine cut-off valve 3 is installed on the brine bypass.

[0016] Compared with the original technology, the utility model has the following beneficial effects:

[0017] 1. The utility model can effectively utilize the large amount of hot water waste heat generated by the VCM process in the brine heating process, replacing or partially replacing steam or electric heating, significantly improving the utilization rate of thermal energy resources, reducing energy consumption, and being low-carbon and environmentally friendly.

[0018] Second, by setting up intelligent control components of online monitoring instruments such as regulating valves, shut-off valves, flow meters, thermometers, and pH meters, and cooperating with the interlocking control system to realize the interlocking control mechanism, the brine concentration, temperature, conductivity and other parameters are monitored in real time, and shut-off valves and bypass valves are provided to ensure the safety and stability of the process and ensure that the process parameters are always within the safe range. When an abnormality is detected, the system automatically opens and closes the relevant valves, thereby improving the operational stability and safety of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the device of the utility model;

[0020] In the picture:

[0021] 1. Hot water tank; 2. Brine tank; 3. Water pump; 4. Heat exchanger 1; 5. Heat exchanger 2; 6. Branch 1; 7. Branch 2; 8. Branch 3; 9. Hot water pressure gauge; 10. Hot water thermometer 2; 11. Flow meter; 12. Control valve 1; 13. Brine concentration meter; 14. Brine thermometer 1; 15. Brine shut-off valve 2; 16. Brine shut-off valve 1; 17. pH meter; 18. Hot water thermometer 1; 19. Conductivity meter; 20. Hot water shut-off valve 1; 21. Brine bypass; 22. Brine shut-off valve 3; 23. Control valve 3; 24. Brine thermometer 2; 25. Control valve 2. DETAILED DESCRIPTION

[0022] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] like Figure 1 The figure shows a VCM hot water waste heat efficient utilization device, comprising a hot water tank 1 for the VCM process and a brine tank 2 for the brine heating process. It also includes an interlocking control system electrically connected to all meters and valves in the device described below. Hot water tank 1 is connected to a hot water outlet pipe, with a water pump 3 installed at the connection between the hot water outlet pipe and hot water tank 1. The hot water outlet pipe is provided with branches 1 (6) and 2 (7). Branch 1 (6) is the hot water pipe for removing lithium bromide, while branch 2 (7) is the hot water return pipe, leading to hot water tank 1. Brine tank 2 is connected to a brine pipe, which is connected in series with heat exchanger 1 (4). Branch 2 (7) is connected to the heat medium pipe of heat exchanger 1 (4).

[0025] A regulating valve 12 is installed on branch 2 (7) at the inlet of the heat medium pipeline. A brine thermometer 14 is installed on the brine pipeline connected to the outlet of heat exchanger 1 (4). The regulating valve 12 and brine thermometer 14 are electrically connected. The hot water outlet pipeline also has a branch 3 (8). Its branch point is near the outlet of water pump 3. Branch 3 (8) serves as the outlet return line, leading to hot water tank 1. A regulating valve 25 is installed on branch 3 (7) at the inlet of the heat medium pipeline. A hot water pressure gauge 9 is installed on branch 2 (7) at the inlet of the heat medium pipeline. The regulating valve 25 and hot water pressure gauge 9 are electrically connected. A hot water thermometer 10 and a flowmeter 11 are also installed on branch 2 (7) at the inlet of the heat medium pipeline.

[0026] Heat exchanger 2 (5) is also connected in series to the brine pipeline between heat exchanger 1 (4) and brine tank 2. The heat source of heat exchanger 2 (5) is steam, which is transported to heat exchanger 2 (5) via a steam pipeline. A regulating valve 3 (23) is installed on the steam pipeline. A brine thermometer 2 (24) is installed on the brine pipeline connected to the outlet of heat exchanger 2 (5). The regulating valve 3 (23) and brine thermometer 2 (24) are electrically connected.

[0027] A pH meter 17, a hot water thermometer 18, and a conductivity meter 19 are installed on branch 2 (7) connected to the outlet of the heat exchanger 4's heat medium pipeline. A brine concentration meter 13 is installed on the brine pipeline connected to the outlet of the heat exchanger 4. A hot water shut-off valve 1 (20) is also installed on branch 2 (7) connected to the outlet of the heat exchanger 4's heat medium pipeline. The brine pipeline is equipped with brine shut-off valve 1 (16) and brine shut-off valve 2 (15), located at the inlet and outlet of the heat exchanger 4, respectively. A brine bypass 21 is installed on the brine pipeline, connected in parallel to brine shut-off valve 1 (16), heat exchanger 4, brine shut-off valve 2 (15), and brine concentration meter 13. A brine shut-off valve 3 (22) is installed on brine bypass 21.

[0028] The working principle of this utility model is as follows:

[0029] Hot water tank 1 is connected to a hot water outlet pipe. A water pump 3 is installed at the junction of hot water tank 1 and the hot water outlet pipe to drive the hot water flow. The hot water outlet pipe is divided into branch 1 (the hot water pipe for removing lithium bromide) and branch 2 (the hot water return pipe). Branch 2 (the hot water return pipe) returns to hot water tank 1, forming a circulating hot water pipeline. Branch 2 (the hot water return pipe) is connected to the heat medium pipe of heat exchanger 1 (the hot water return pipe), allowing the heat of the hot water to be transferred to the brine.

[0030] The brine tank 2 is connected in series with the heat exchanger 4 via a brine pipeline. A regulating valve 12 is installed on branch 2 (7) at the inlet of the heat medium pipeline, and a brine thermometer 14 is installed on the brine pipeline connected to the outlet of the heat exchanger 4. These two branches are interconnected via electrical signals to achieve temperature feedback control. The hot water outlet pipeline also has a branch 3 (outlet return line) 8, which branches off near the outlet of the water pump 3 and also returns to the hot water tank 1 to regulate the outlet pressure of the water pump 3. This branch 3 (8) is equipped with a regulating valve 25, and a hot water pressure gauge 9 is installed on branch 2 (7) at the inlet of the heat medium pipeline. These two branches are also interconnected via electrical signals to ensure stable outlet pressure of the water pump 3.

[0031] At the inlet of the heat medium pipeline of branch 2 (7), a hot water thermometer 2 (10) and flowmeter 11 are installed to monitor the temperature and flow of the hot water. Heat exchanger 2 (5) is further connected in series to the brine pipeline between heat exchanger 1 (4) and brine tank 2. Its heat source comes from steam, which is transported to heat exchanger 2 (5) via the steam pipeline. A regulating valve 3 (23) is installed in the steam pipeline, and a brine thermometer 2 (24) on the corresponding brine pipeline is also electrically connected to it, allowing precise control of the brine heating process at the end of the brine pipeline.

[0032] The device is equipped with an interlocking control system that fully electrically connects all meters and valves to ensure real-time monitoring and automated adjustment of system operating parameters. A pH meter 17, a hot water thermometer 18, and a conductivity meter 19 are installed on branch 27, which is connected to the outlet of the heat medium pipeline of heat exchanger 14, to monitor water quality. At the same time, a brine concentration meter 13 is installed on the brine pipeline connected to the outlet of heat exchanger 14 to monitor changes in brine concentration. When an abnormal value is detected, the interlock opens brine shut-off valve 3 22, closes brine shut-off valve 16 and shut-off valve 2 15, delays closing (to a set value) regulating valve 12, and closes hot water shut-off valve 20. During this process, regulating valve 2 25 automatically adjusts according to the pump pressure to ensure stable pump pressure, improving the operational stability and safety of the entire system.

[0033] A hot water shut-off valve 1 (20) is installed at the outlet of the heat medium pipeline on branch 2 (7). The brine pipeline is equipped with brine shut-off valves 1 (16) and 2 (15), located at the inlet and outlet of heat exchanger 1 (4), respectively, to ensure safe operation. Furthermore, a brine bypass 21 is provided on the brine pipeline, connected in parallel to brine shut-off valve 1 (16), heat exchanger 1 (4), brine shut-off valve 2 (15), and brine concentration meter 13. A brine shut-off valve 3 (22) is installed on the bypass, providing flexible process flow switching options. For example, if the brine concentration meter 13 displays abnormal readings, or if a problem with the brine bypass 21 is to be investigated, brine shut-off valves 1 (16) and 2 (15) can be closed, bypassing the brine flow through brine shut-off valve 3 (22), allowing heat exchanger 1 (4) to be removed for maintenance.

[0034] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A VCM hot water waste heat efficient utilization device, comprising a hot water tank (1) of a VCM process and a brine tank (2) of a brine heating process, characterized in that: The hot water tank (1) is connected to a hot water outlet pipe, a water pump (3) is installed at the connection between the hot water outlet pipe and the hot water tank (1), and a branch 1 (6) and a branch 2 (7) are provided on the hot water outlet pipe, the branch 1 (6) is a hot water pipe for removing lithium bromide, the branch 2 (7) is a hot water loop pipe, and the branch 2 (7) leads to the hot water tank (1); The brine tank (2) is connected to a brine pipeline, a heat exchanger 1 (4) is connected in series to the brine pipeline, and branch 2 (7) is connected to the heat medium pipeline of the heat exchanger 1 (4).

2. A VCM hot water waste heat efficient utilization device according to claim 1, characterized in that: A regulating valve (12) is installed on branch 2 at the inlet of the heat medium pipeline, and a brine thermometer (14) is installed on the brine pipeline connected to the outlet of the heat exchanger (4). The regulating valve (12) and the brine thermometer (14) are connected through an electrical signal.

3. A VCM hot water waste heat efficient utilization device according to claim 1, characterized in that: A branch three (8) is also provided on the hot water outlet pipeline, the branch point of the branch three (8) is close to the outlet of the water pump (3), the branch three (8) is an outlet return pipeline, leading to the hot water tank (1), and a regulating valve two (25) is provided on the branch three (8); a hot water pressure gauge (9) is installed on the branch two at the inlet of the heat medium pipeline; the regulating valve two (25) and the hot water pressure gauge (9) are connected through an electrical signal.

4. A VCM hot water waste heat efficient utilization device according to claim 1, characterized in that: A second hot water thermometer (10) and a flow meter (11) are installed on the second branch at the inlet of the heat medium pipeline.

5. A VCM hot water waste heat efficient utilization device according to claim 1, characterized in that: A heat exchanger 2 (5) is also connected in series on the brine pipeline between the heat exchanger 1 (4) and the brine tank (2). The heat source of the heat exchanger 2 (5) is a steam medium, which is transported to the heat exchanger 2 (5) through a steam pipeline.

6. A VCM hot water waste heat efficient utilization device according to claim 5, characterized in that: A regulating valve three (23) is installed on the steam pipeline, and a brine thermometer two (24) is installed on the brine pipeline connected to the outlet of the heat exchanger two (5). The regulating valve three (23) and the brine thermometer two (24) are connected through electrical signals.

7. A VCM hot water waste heat efficient utilization device according to any one of claims 1 to 6, characterized in that: It also includes an interlock control system, which is electrically connected to all the meters and valves in the device.

8. A VCM hot water waste heat efficient utilization device according to claim 7, characterized in that: A pH meter (17), a hot water thermometer (18) and a conductivity meter (19) are installed on branch 2 (7) connected to the outlet of the heat medium pipeline of heat exchanger 1, and a brine concentration meter (13) is installed on the brine pipeline connected to the outlet of heat exchanger 1.

9. A VCM hot water waste heat efficient utilization device according to claim 8, characterized in that: A hot water shut-off valve 1 (20) is also installed on branch 2 (7) connected to the outlet of the heat medium pipeline of heat exchanger 1; a brine shut-off valve 1 (16) and a brine shut-off valve 2 (15) are installed on the brine pipeline, and the brine shut-off valve 1 (16) and the brine shut-off valve 2 (15) are respectively located at the inlet and outlet of heat exchanger 1 (4).

10. A VCM hot water waste heat efficient utilization device according to claim 9, characterized in that: A brine bypass (21) is provided on the brine pipeline. The brine bypass (21) is connected in parallel with a brine cut-off valve 1 (16), a heat exchanger 1 (4), a brine cut-off valve 2 (15), and a brine concentration meter (13). A brine cut-off valve 3 (22) is installed on the brine bypass (21).

Images