CN217490821U

CN217490821U - Temperature control system of reaction kettle

Info

Publication number: CN217490821U
Application number: CN202221139304.2U
Authority: CN
Inventors: 顾广宇; 田爽; 杨繁; 何红波
Original assignee: Guangdong Huanqiu Guangye Engineering Co ltd
Current assignee: Guangdong Huanqiu Guangye Engineering Co ltd
Priority date: 2022-05-12
Filing date: 2022-05-12
Publication date: 2022-09-27
Anticipated expiration: 2032-05-12

Abstract

The utility model provides a reation kettle's temperature control system relates to resin production facility technical field. The temperature control system of the utility model comprises a main pipeline, a first bypass and a second bypass; the input end of the main pipeline is provided with a first valve, and the output end of the main pipeline is provided with a second valve; a delivery pump and a reaction kettle are sequentially arranged on the main pipeline along the fluid flowing direction; the reaction kettle comprises a main body and a heat exchange device, and the main pipeline is communicated with the heat exchange device; two ends of the first bypass are respectively connected with the input end and the output end of the main pipeline; the two ends of the second bypass are respectively connected with a main pipeline between the delivery pump and the reaction kettle, a heat exchanger is arranged on the second bypass, and a third valve is arranged on the second bypass. The utility model discloses an accurate accuse temperature of material in the reation kettle can be realized to temperature control system.

Description

Temperature control system of reaction kettle

Technical Field

The utility model relates to a resin production facility technical field especially relates to a reation kettle's temperature control system.

Background

Alkyd resin is an important chemical raw material, and the production of the alkyd resin needs to be carried out through the processes of alcoholysis reaction, esterification reaction, carbamation reaction, emulsification process, solvent removal, filtration and the like. The esterification reaction is carried out in a reaction kettle, the raw materials such as vegetable oleic acid, polyol, phthalic anhydride, auxiliary agent and the like are added into the reaction kettle according to the formula proportion, stirring is started, and the reaction is completed through heating, heat preservation esterification and negative pressure dehydration. The resin production widely adopts a heat medium heating technology, heat is transferred through a heat carrier (such as heat transfer oil) to carry out indirect heating, and the heat medium heating technology has the advantages of uniform heat transfer, energy conservation, safety, convenient operation and the like.

The alkyd resin reaction process can be divided into three temperature states of temperature rise, heat preservation and temperature reduction, the whole reaction process is required to be closely connected, and the temperature is controlled by hot oil and cold oil in an alternative mode in the existing temperature control measure (as shown in figure 1). The existing alkyd resin production process mainly adopts heat conduction oil for heat transfer, and when a reaction system does not need to provide energy, the heat transfer oil circulates and runs in a self system through a small cycle; the intermittent circulation of the refrigerant is that the refrigerant actually starts to start when the process requires cooling. The cooling medium and the heating medium are circulated to implement temperature rise and temperature reduction by sharing a set of coil pipes and jackets for heat transfer, and in the actual production process, a simple temperature regulating system is adopted, so that the temperature in the later stage of alcoholysis and esterification is difficult to keep stable.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need to provide a temperature control system for a reaction vessel, which can achieve accurate temperature control of the reaction vessel.

A temperature control system of a reaction kettle comprises a main pipeline, a first bypass and a second bypass; the input end of the main pipeline is provided with a first valve, and the output end of the main pipeline is provided with a second valve; a delivery pump and a reaction kettle are sequentially arranged on the main pipeline along the fluid flowing direction; the reaction kettle comprises a main body and a heat exchange device, the heat exchange device is arranged on the outer wall of the main body, and the main pipeline is communicated with the heat exchange device; two ends of the first bypass are respectively connected with the input end and the output end of the main pipeline, so that the first bypass and the main pipeline form an internal circulating channel; the two ends of the second bypass are respectively connected with a main pipeline between the delivery pump and the reaction kettle, a heat exchanger is arranged on the second bypass, a third valve is arranged on the second bypass, and the third valve is used for controlling the connection and disconnection of the second bypass and the main pipeline.

In the temperature control system, a heating medium is conveyed to the system through a main pipeline, and in the temperature rising stage, the heating medium heats reaction raw materials in the reaction kettle; in the heat preservation stage, a small amount of heat medium is supplemented to the main pipeline for maintaining the reaction temperature; at the cooling stage, the main line no longer lets in the heat medium, and the heat medium circulates in the internal circulation passageway, and the heat exchanger on the second bypass can be to the heat medium cooling, then to the material cooling in the reation kettle. The utility model discloses a temperature control system heats and keeps warm to reation kettle through outside heat medium, through inside circulation passageway and heat exchanger to reation kettle cooling, can avoid the unsafe problem of temperature control that the fluctuation of heat medium temperature leads to greatly, the utility model discloses a temperature control system can realize the accurate control to temperature in the reation kettle, operation safe and reliable.

In one embodiment, the third valve is a three-way valve, one port of the three-way valve is connected to the outlet of the second bypass, and the other two ports are connected to the main pipeline. The connection and disconnection of the second bypass and the main pipeline can be controlled by adjusting the three-way valve.

In one embodiment, the heat exchange device is a jacket or a coil.

In one embodiment, a fourth valve is disposed on the first bypass.

In one embodiment, the heat exchanger is a shell-and-tube heat exchanger or a shell-and-tube heat exchanger.

In one embodiment, the heat exchanger is provided with a refrigerant inlet pipe and a refrigerant outlet pipe, and the refrigerant inlet pipe is provided with a fifth valve.

In one embodiment, the transfer pump is a hot oil pump.

In one embodiment, the delivery pump is a variable frequency pump.

Compared with the prior art, the utility model discloses following beneficial effect has:

the temperature control system of the utility model conveys the heat medium to the system through the main pipeline, and the heat medium heats the reaction raw materials in the reaction kettle in the temperature rising stage; in the heat preservation stage, a small amount of heating medium is supplemented to the main pipeline to maintain the reaction temperature; at the cooling stage, the main line no longer lets in the heat medium, and the heat medium circulates in the internal circulation passageway, and the heat exchanger on the second bypass can be to the heat medium cooling, then to the material cooling in the reation kettle. The utility model discloses a temperature control system heats and keeps warm to reation kettle through outside heat medium, through inside circulation passageway and heat exchanger to the reation kettle cooling, can avoid the unsafe problem of temperature control that the heat medium temperature fluctuation leads to greatly, the utility model discloses a temperature control system can realize the accurate control to temperature in the reation kettle, moves safe and reliable.

Drawings

FIG. 1 is a prior art temperature control system.

FIG. 2 is a schematic view of an exemplary temperature control system.

In the figure, 100, a main pipeline, 110, a first valve, 120, a second valve, 200, a delivery pump, 300, a reaction kettle, 310, a main body, 320, a heat exchange device, 400, a first bypass, 410, a fourth valve, 500, a second bypass, 510, a heat exchanger, 600 and a third valve.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are illustrated in the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "coupled" to another element, it can be directly coupled to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Example 1

A temperature control system of a reaction kettle is shown in FIG. 2, and comprises a main pipeline 100, a first bypass 400 and a second bypass 500, a transfer pump 200 and a reaction kettle 300 which are arranged on the main pipeline 100, and a heat exchanger 510 which is arranged on the second bypass 500.

The main pipeline 100 is used for conveying a heat medium, and in this embodiment, the heat medium is heat conduction oil. The main line 100 has a first valve 110 at an input end and a second valve 120 at an output end. The transfer pump 200 and the reaction kettle 300 are sequentially arranged on the main pipeline 100 along the heat medium transfer direction, and the transfer pump 200 transfers the heat medium to the reaction kettle 300 for heat exchange. The reaction kettle 300 comprises a main body 310 and a heat exchange device 320, wherein the heat exchange device 320 is arranged on the outer wall of the main body 310, the main pipeline 100 is communicated with the heat exchange device 320, the main body 310 is used for containing reaction raw materials, and the heat exchange device 320 is used for introducing a heating medium and exchanging heat with the materials in the main body 310. The heat exchange device 320 is a jacket or a coil pipe, and the delivery pump 200 is a variable-frequency hot oil pump which has the effect of high temperature resistance.

The two ends of the first bypass 400 are respectively connected with the input end and the output end of the main pipeline 100, so that the first bypass 400 and the main pipeline 100 form an internal circulation channel, and the internal circulation channel is formed by connecting devices or components such as the first bypass 400, the main pipeline 100, the delivery pump 200, the reaction kettle 300 and the like, and internal circulation of the heat conduction oil in the system is realized. To facilitate the on/off control of the first bypass 400, a fourth valve 410 may be disposed on the first bypass 400.

The second bypass 500 is connected on the main pipeline 100 between the delivery pump 200 and the reaction kettle 300, two ends of the second bypass 500 are respectively connected on the main pipeline 100, the second bypass 500 is provided with a heat exchanger 510, the heat exchanger 510 is provided with a refrigerant inlet pipe and a refrigerant outlet pipe, the refrigerant inlet pipe is provided with a fifth valve, and the fifth valve is opened to lead in refrigerant to the refrigerant inlet pipe, so that the heat medium in the heat exchanger 510 can be cooled. The heat exchanger 510 may be a shell-and-tube heat exchanger or a shell-and-tube heat exchanger.

The second bypass 500 is provided with a third valve 600 for controlling the connection and disconnection of the second bypass 500 to and from the main pipe 100. In this embodiment, the third valve 600 is a three-way valve, which is disposed at the connection between the output end of the second bypass 500 and the main pipeline 100, and one port (a) of the three-way valve is connected to the outlet of the second bypass 500, and the other two ports (b and c) are connected to the main pipeline 100. The on-off of the main pipeline 100 and the on-off of the second bypass 500 and the main pipeline 100 can be controlled by adjusting the three ports of the three-way valve. For example, when a, c are on and b is off, the heat conducting oil does not pass through the second bypass 500; b. when the switch is on and the switch is off, the heat conducting oil flows into the second bypass 500 from the main pipeline 100 and then flows into the main pipeline 100. a. When b and c are both opened, part of the heat conducting oil continues to flow away from the main pipeline 100, and part of the heat conducting oil passes through the second bypass 500 and then flows into the main pipeline 100.

The first valve 110, the second valve 120 and the fourth valve 410 may be adjustable valves, so as to adjust the opening according to the operating conditions.

Example 2

The method for controlling the temperature of the alkyd resin reaction kettle by using the temperature control system of embodiment 1 is as follows.

In the stage of needing temperature rise: the first valve 110, the second valve 120 and the fourth valve 410 are opened, the first valve 110 is fully opened, the three-way valve is set to be a-open, b-closed and c-open, that is, the second bypass 500 is disconnected from the main pipeline 100, so that the supply of the heat conduction oil is ensured, the heat conduction oil exchanges heat in the reaction kettle 300, and the material in the reaction kettle 300 is heated to the target reaction temperature.

In the stage of needing heat preservation: keeping the second valve 120 and the fourth valve 410 in an open state, controlling the opening of the first valve 110 to be 10% -20%, setting the three-way valve to be a-open, b-closed and c-open, and maintaining the temperature at the target reaction temperature in the heat preservation stage, wherein the purpose can be achieved by maintaining a small amount of external heat conduction oil. The flow rate of the transfer pump 200 in the heat preservation stage is far greater than that of external oil supply, that is, the circulation volume of the heat conduction oil of the reaction kettle 300 is far greater than the oil supply volume of the external heat conduction oil of the system, so as to achieve the purpose of accurate temperature control.

In the stage of needing temperature reduction: the first valve 110 and the second valve 120 are closed, the fourth valve 410 is kept in an open state, the three-way valve is switched to a-off, b-on and c-on, that is, the second bypass 500 is communicated with the main pipeline 100, and simultaneously cooling water is introduced into the heat exchanger 510 to cool the heat conducting oil in the heat exchanger 510. In this stage, no external heat conduction oil is required to be supplied, the heat conduction oil circulates inside the system, the temperature of the heat conduction oil cooled by the heat exchanger 510 is increased after the heat exchange of the reaction kettle 300 is performed, the temperature of the materials in the reaction kettle 300 is reduced, the heated heat conduction oil enters the heat exchanger 510 again to be cooled, and the circulation is repeated until the temperature of the materials in the reaction kettle 300 is reduced to the target cooling temperature.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A temperature control system of a reaction kettle is characterized by comprising a main pipeline, a first bypass and a second bypass; the input end of the main pipeline is provided with a first valve, and the output end of the main pipeline is provided with a second valve; a delivery pump and a reaction kettle are sequentially arranged on the main pipeline along the fluid flowing direction; the reaction kettle comprises a main body and a heat exchange device, the heat exchange device is arranged on the outer wall of the main body, and the main pipeline is communicated with the heat exchange device; two ends of the first bypass are respectively connected with the input end and the output end of the main pipeline, so that the first bypass and the main pipeline form an internal circulating channel; the two ends of the second bypass are respectively connected with a main pipeline between the delivery pump and the reaction kettle, a heat exchanger is arranged on the second bypass, a third valve is arranged on the second bypass, and the third valve is used for controlling the connection and disconnection of the second bypass and the main pipeline.

2. The temperature control system of claim 1, wherein the third valve is a three-way valve having one port connected to the outlet of the second bypass and two other ports connected to the main bypass.

3. The temperature control system of claim 1, wherein the heat exchanging device is a jacket or a coil.

4. The temperature control system of claim 1, wherein a fourth valve is disposed on the first bypass.

5. The temperature control system of claim 1, wherein the heat exchanger is a shell and tube heat exchanger or a shell and tube heat exchanger.

6. The temperature control system according to claim 1, wherein the heat exchanger is provided with a refrigerant inlet pipe and a refrigerant outlet pipe, and the refrigerant inlet pipe is provided with a fifth valve.

7. The temperature control system of claim 1, wherein the transfer pump is a hot oil pump.

8. The temperature control system of any one of claims 1 to 7, wherein the delivery pump is a variable frequency pump.