Normal-temperature feeding on-line switching temperature control device

Abstract

The utility model discloses a normal temperature feed on -line switching temperature control device, including feed pipeline, its characterized in that, the feed pipeline on setting feed heat exchanger, feed heat exchanger include process material flow channel and heat exchange medium flow channel, heat exchange medium include heat medium and coolant, and heat medium and coolant feed respectively through feed medium tee joint heat exchange medium import of feed heat exchanger, and the heat exchange medium export of feed heat exchanger is connected heat medium discharge and coolant discharge respectively through discharge medium tee joint. The utility model discloses a device application in normal temperature feed occasion, realizes the automatic regulation of feed temperature, and temperature regulation control is sensitive, accurate, avoids the disadvantageous influence of the change of external factor such as extreme high, low temperature weather to the device.

Description

Technical Field

[0001] This utility model belongs to the field of chemical equipment technology and relates to an online switching temperature control device for ambient temperature feeding. Background Technology

[0002] In chemical production, chemical unit operations such as reaction, distillation, and separation are often carried out in equipment or containers such as reactors, towers, and tanks. Process materials must meet certain process conditions before they can enter the corresponding equipment or containers for processing, among which material temperature is an important process control parameter.

[0003] In chemical processes, some feed materials are designed to be at room temperature. Changes in feed temperature caused by other factors can affect chemical operations such as reaction, distillation, and separation. Instability in feed temperature can cause fluctuations in the operation of chemical units, prevent the achievement of expected process objectives, increase by-products or impurities, incomplete reaction or separation, reduced yield, and even lead to equipment failure or interlock shutdown of the unit.

[0004] In existing chemical plants, ambient temperature feeding has the following shortcomings: 1) The feed temperature may change due to other factors, resulting in fluctuations in the feed temperature of the unit; 2) During extreme high temperatures in summer, the feed temperature may exceed the normal design feed temperature; 3) In winter, when there is extreme low temperature and rain or snow, the feed temperature will be lower than the normal design feed temperature, and some pipes will freeze and blockage, affecting the normal production of the equipment.

[0005] There is an urgent need to improve the feeding device and adjust the process and operation to avoid the impact of changes in external factors on the ambient temperature of the feed. Summary of the Invention

[0006] The purpose of this utility model is to provide an online switching temperature control device for ambient temperature feeding, which solves the problems caused by ambient temperature feeding temperature fluctuations, achieves precise control of the feeding temperature during daily operation of the device, and ensures normal production and stable operation of the device under extreme weather conditions.

[0007] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: A ambient temperature feed online switching temperature control device includes a feed pipeline, characterized in that a feed heat exchanger is installed on the feed pipeline, the feed heat exchanger includes a process material flow channel and a heat exchange medium flow channel, the heat exchange medium includes a hot medium and a cold medium, the hot medium and the cold medium are respectively connected to the heat exchange medium inlet of the feed heat exchanger through a feed medium tee, and the heat exchange medium outlet of the feed heat exchanger is respectively connected to the hot medium outlet and the cold medium outlet through a discharge medium tee.

[0008] Furthermore, the feed heat exchanger is a shell-and-tube heat exchanger; preferably, it is a shell-and-tube heat exchanger, wherein the process material flows through the shell side and the heat exchange medium flows through the tube side.

[0009] Furthermore, the feed heat exchanger is equipped with process crossover lines, which are respectively connected to the process material feed end and the process material discharge end of the process material flow channel.

[0010] Furthermore, a temperature detection gauge is installed at the discharge end of the process material.

[0011] Furthermore, a temperature regulating valve is installed on the process line, and an instrument loop control is established with the temperature detection gauge to realize the automatic adjustment of the temperature of the process materials.

[0012] Beneficial effects: This utility model's ambient temperature feeding online switching temperature control device, applied in ambient temperature feeding applications, achieves automated control of feeding temperature regulation with sensitive temperature control; it avoids the adverse effects of extreme high and low temperatures and other external factors on the device. When internal leakage occurs in the heat exchanger, switching to cross-line operation allows for online emptying and handover of the equipment. The device reduces the initial investment in heat exchangers, requiring only one heat exchanger. Specifically, it includes the following advantages: 1) The feed temperature regulation achieves automated and precise control, while reducing the frequency of manual operation.

[0013] 2) It saves on the initial investment in heat exchangers, as there is no need to install separate feed heaters and coolers; only one heat exchanger is required.

[0014] 3) When an internal leak occurs in the heat exchanger, switching to cross-line operation allows the heat exchanger to be handed over for maintenance.

[0015] The device is highly practical, easy to operate, and has low construction and maintenance costs. After being put into use, it can ensure the stability of the device, reduce the difficulty of process operation, maintenance costs, and operational risks in the production process, and has significant economic benefits. Attached Figure Description

[0016] Figure 1 is a schematic diagram of the structure of the ambient temperature feeding online switching temperature control device of this utility model; Among them, 1. Feed heat exchanger, 2. Heat medium feed valve, 3. Heat medium discharge valve, 4. Refrigerant feed valve, 5. Refrigerant discharge valve, 6. Process feed valve, 7. Process discharge valve, 8. Process crossover valve, 9. Temperature regulating valve, 10. Temperature gauge, 11. Feed medium tee, 12. Feed crossover tee, 13. Discharge medium tee, 14. Discharge crossover tee. Detailed Implementation

[0017] The technical solution of this utility model will be further described in detail below through specific embodiments. However, it should be noted that the following embodiments are only used to describe the content of the invention and do not constitute a limitation on the protection scope of this utility model.

[0018] like Figure 1 An online temperature control device for ambient temperature feeding is installed on the feed pipeline of equipment or container with ambient temperature feeding. It includes a feed heat exchanger 1, which is a shell-and-tube heat exchanger, wherein the process material flows through the shell side and the heat exchange medium flows through the tube side. The heat exchange medium of the feed heat exchanger 1 includes a hot medium and a cold medium. The hot medium is fed through a hot medium feed valve 2 connected to a feed medium tee 11, and the cold medium is fed through a cold medium feed valve connected to the feed medium tee 11. The feed medium tee 11 is connected to the heat exchange medium inlet of the feed heat exchanger 1, and the heat exchange medium outlet of the feed heat exchanger 1 is connected to a discharge medium tee 13. The discharge medium tee 13 is connected to the hot medium discharge valve 3 and the cold medium discharge valve 5, respectively, for hot medium discharge and cold medium discharge.

[0019] The process feed enters the feed heat exchanger 1 through the feed tee 12 and the process feed valve 6. After heat exchange, it flows out of the feed heat exchanger 1 through the process discharge valve 7 and the discharge tee 14. A temperature gauge 10 is installed on the process discharge valve. The feed tee 12 and the discharge tee 14 are connected by a process tee 8, which is equipped with a temperature regulating valve 9. The flow rate of the process material on the process tee 8 is adjusted according to the temperature gauge 10.

[0020] In the aforementioned apparatus, the inlet and outlet of the process material flow channel of the feed heat exchanger 1 includes a process feed valve 6 and a process discharge valve 7, respectively equipped with a feed tee 12 and a discharge tee 14. A process crossover 8 is also added to the feed heat exchanger 1, and a temperature regulating valve 9 is provided. The feed flow under temperature control conditions is: process feed → feed tee 12 (process crossover → temperature regulating valve → process discharge) → process feed valve → feed heat exchanger → process discharge valve → discharge tee 14 → process discharge.

[0021] A feed medium tee 11 and a discharge medium tee 13 are added to the inlet and outlet of the heat exchange medium flow channel of the feed heat exchanger 1, respectively. The feed medium tee is connected to the heating medium and the cooling medium. During heating, the flow of the heat exchange medium is as follows: heat medium feed → feed medium tee (connected to the cold medium feed) → feed heat exchanger → discharge medium tee (connected to the cold medium discharge) → heat medium discharge. During cooling, the flow of the heat exchange medium is as follows: cold medium feed → feed medium tee (connected to the heat medium feed) → feed heat exchanger → discharge medium tee (connected to the heat medium discharge) → cold medium discharge.

[0022] Using the aforementioned ambient temperature feeding online switching temperature control device, the specific operation process for feeding process materials is as follows: 1) When using heat medium for heating, close the refrigerant inlet valve 4 and refrigerant outlet valve 5, and open the heat medium inlet valve 2, heat medium outlet valve 3, process inlet valve 6, and process outlet valve 7. Adjust the temperature regulating valve 9 through the temperature detection gauge 10 to control the outlet temperature of the process material in the feed heat exchanger 1.

[0023] 2) When using refrigerant for cooling, close the hot medium inlet valve 2 and the hot medium outlet valve 3, and open the refrigerant inlet valve 4, the refrigerant outlet valve 5, the process inlet valve 6, and the process outlet valve 7. Adjust the temperature regulating valve 9 through the temperature detection gauge 10 to control the outlet temperature of the process material in the feed heat exchanger 1.

[0024] If the feed heat exchanger 1 experiences internal leakage or malfunction and needs to be shut down for maintenance, open the temperature regulating valve 9, close the hot medium feed valve 2, hot medium discharge valve 3, cold medium feed valve 4, and cold medium discharge valve 5, and switch to the process cross line 8 of the feed heat exchanger 1 for operation. The feed heat exchanger 1 is then handed over for maintenance.

Claims

1. A room temperature feeding online switching temperature control device, comprising a feeding pipeline, characterized in that, A feed heat exchanger is installed on the feed pipeline. The feed heat exchanger includes a process material flow channel and a heat exchange medium flow channel. The heat exchange medium includes a hot medium and a cold medium. The hot medium and the cold medium are respectively connected to the heat exchange medium inlet of the feed heat exchanger through a feed medium tee. The heat exchange medium outlet of the feed heat exchanger is respectively connected to the hot medium outlet and the cold medium outlet through a discharge medium tee.

2. The ambient temperature feeding online switching temperature control device according to claim 1, characterized in that, The feed heat exchanger is a partitioned heat exchanger.

3. The ambient temperature feeding online switching temperature control device according to claim 2, characterized in that, The feed heat exchanger is a shell-and-tube heat exchanger, wherein the process material flows through the shell side and the heat exchange medium flows through the tube side.

4. The ambient temperature feeding online switching temperature control device according to claim 1, characterized in that, The feed heat exchanger is equipped with process crossover lines, which are respectively connected to the process material feed end and the process material discharge end of the process material flow channel.

5. The ambient temperature feeding online switching temperature control device according to claim 1, characterized in that, A temperature detection gauge is installed at the process material outlet end of the process material flow channel.

6. The ambient temperature feeding online switching temperature control device according to claim 1, characterized in that, Temperature regulating valves are installed across the process line.

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