CN108021159B

CN108021159B - Crystallization kettle temperature control system and control method

Info

Publication number: CN108021159B
Application number: CN201711422767.3A
Authority: CN
Inventors: 刘卫民; 王珏
Original assignee: Shanghai Pengmao Electromechancial Equipment Co ltd
Current assignee: Shanghai Pengmao Electromechancial Equipment Co ltd
Priority date: 2017-12-25
Filing date: 2017-12-25
Publication date: 2023-11-10
Anticipated expiration: 2037-12-25
Also published as: CN108021159A

Abstract

The invention discloses a crystallization kettle temperature control system and a crystallization kettle temperature control method, wherein the crystallization kettle temperature control system comprises the following steps: a medium pipe having a fluid medium therein; the medium control device is respectively connected with the medium pipeline and the crystallization kettle and controls the temperature of the temperature control fluid by controlling the input quantity of the fluid medium and/or the input type of the fluid medium; the medium control device controls the temperature of the crystallization kettle through a temperature control fluid; a gas control device for outputting instrument air to the medium control device; the electric control device is respectively connected with the medium control device and the crystallization kettle and is used for sensing the temperature of the fluid medium, the temperature control fluid, the medium control device and the materials in the crystallization kettle and controlling the input quantity of the fluid medium of the medium control device and the type of the fluid medium input. The invention has the advantages and beneficial effects that: the control precision is improved, the accurate control of the temperature of the materials in the crystallization kettle is realized, the stability of the temperature control of the crystallization kettle is ensured, and the crystallization process is better controlled.

Description

Crystallization kettle temperature control system and control method

Technical Field

The invention relates to the field of temperature control, in particular to a crystallization kettle temperature control system and a crystallization kettle temperature control method.

Background

In the prior crystallization kettle temperature control, the temperature inside the crystallization kettle is mostly controlled by controlling the quantity of a cold source and a heat source entering the interlayer so as to achieve the purpose of controlling the crystallization process. Although intelligent control schemes such as PLC or DCS are adopted at present, the method has the following defects:

1. because the heat exchange area of the crystallization kettle is relatively large, the temperature difference exists between the heat exchange surfaces, and the heating or cooling of the materials is easy to be uneven. In practical production, the stirring is improved to avoid the phenomenon of damaging the formation of crystals, which becomes more and more obvious with the increase of the volume of the crystallization kettle.

2. Because the material in the crystallization kettle and the jacket need to exchange heat, a large time difference exists between the temperature of the material in the crystallization kettle and the change of the cold and heat sources in the jacket, namely the temperature of the material in the jacket is changed after the temperature in the jacket is adjusted for a long time. The overshoot phenomenon is easy to generate for the temperature control of the materials, and the overshoot phenomenon is easy to cause quality degradation for the unidirectional control process of the crystallization kettle.

Disclosure of Invention

In order to solve the problems, the invention provides a crystallization kettle temperature control system and a crystallization kettle temperature control method. According to the technical scheme, based on a crystallization kettle temperature control system, a heating control flow, a cooling control flow and a heat preservation control flow are adopted, the temperature of the ethylene glycol aqueous solution is controlled to reach the temperature of materials in the crystallization kettle by utilizing a water pump, and the crystallization kettle is subjected to heat exchange, so that compared with the existing temperature control mode with larger hysteresis, the control precision is improved, the accurate control of the temperature of the materials in the crystallization kettle is realized, the overshoot phenomenon generated by the temperature control of the materials in the prior art is avoided, and the crystallization process is further controlled better;

By arranging the buffer tank, the condition that flow fluctuation occurs in the temperature control fluid entering the interlayer of the crystallization kettle is avoided, so that the condition that the heat exchanged by the temperature control fluid fluctuates when the temperature control fluid exchanges heat with the crystallization kettle is avoided, and the stability of the temperature control of the crystallization kettle is ensured;

the temperature control part is adopted to enable the temperature control fluid to flow stably and rapidly in the interlayer of the crystallization kettle, so that even under the condition of large temperature difference between materials and the temperature control fluid, the temperature control fluid of the input valve and the temperature control fluid of the output valve still have small temperature difference, and the temperature control fluid in the interlayer of the crystallization kettle is continuously controlled at a certain temperature value, thereby avoiding the condition of uneven heating or cooling of the materials in the prior art and better controlling the crystallization process.

The invention relates to a crystallization kettle temperature control system, which is used for controlling the temperature of a crystallization kettle and comprises the following components:

a medium pipe having a fluid medium therein;

the medium control equipment is respectively connected with the medium pipeline and the crystallization kettle; the medium control device controls the temperature of the temperature control fluid in the medium control device by controlling the input quantity of the fluid medium and/or the type of the fluid medium input; the medium control equipment controls the temperature of the crystallization kettle through the temperature control fluid;

The gas control device is connected with the medium control device and is used for outputting instrument air to the medium control device;

and the electric control device is respectively connected with the medium control device and the crystallization kettle and is used for sensing the temperatures of the fluid medium, the temperature control fluid, the medium control device and the materials in the crystallization kettle and controlling the input quantity of the fluid medium of the medium control device and the type of the input of the fluid medium according to the temperatures of the fluid medium, the temperature control fluid, the medium control device and the materials.

In the above scheme, the types of the fluid medium in the medium pipeline comprise high-temperature fluid, low-temperature fluid and normal-temperature fluid;

the medium pipeline comprises a high-temperature pipeline filled with the high-temperature fluid, a low-temperature pipeline filled with the low-temperature fluid and a normal-temperature pipeline filled with the normal-temperature fluid;

the output end of the high-temperature pipeline is connected with a high-temperature fluid output valve, and the input end of the high-temperature pipeline is connected with a high-temperature fluid input valve; the output end of the low-temperature pipeline is connected with a low-temperature fluid output valve, and the input end of the low-temperature pipeline is connected with a low-temperature fluid input valve; the output end of the normal temperature pipeline is connected with a normal temperature fluid output valve, and the input end of the normal temperature pipeline is connected with a normal temperature fluid input valve.

In the above aspect, the medium control apparatus includes:

the compensation part is respectively connected with the high-temperature fluid output valve, the low-temperature fluid output valve and the normal-temperature fluid output valve so as to receive the high-temperature fluid, the low-temperature fluid and the normal-temperature fluid;

the temperature control part is respectively connected with the compensation part and the crystallization kettle to receive high-temperature fluid, low-temperature fluid or normal-temperature fluid and then form temperature control fluid so as to heat, cool or preserve heat the crystallization kettle;

the pressure release part is connected with the temperature control part to control the pressure of the temperature control part; the pressure release part is also respectively connected with the high-temperature fluid input valve, the low-temperature fluid input valve and the normal-temperature fluid input valve so as to output temperature control fluid.

In the above scheme, the compensation part comprises a high-temperature input cut-off valve, a low-temperature input cut-off valve, a normal-temperature input cut-off valve, a medium cut-off valve and a medium regulating valve;

the input port of the high-temperature input cut-off valve is connected with the output port of the high-temperature fluid output valve, and the output port of the high-temperature input cut-off valve is respectively connected with the medium cut-off valve and the medium regulating valve;

the input port of the low-temperature input cut-off valve is connected with the output port of the low-temperature fluid output valve, and the output port of the low-temperature input cut-off valve is respectively connected with the medium cut-off valve and the medium regulating valve;

The input port of the normal temperature input cut-off valve is connected with the output port of the normal temperature fluid output valve, and the output port of the normal temperature input cut-off valve is respectively connected with the medium cut-off valve and the medium regulating valve;

and the output ports of the medium cut-off valve and the medium regulating valve are respectively connected with the temperature control part.

In the above scheme, the temperature control part comprises a filter, a mixer, a water pump, a buffer tank, an input valve, an output valve, a safety valve and a drain valve;

the input port of the filter is respectively connected with the output ports of the medium cut-off valve and the medium regulating valve, and the medium cut-off valve and the medium regulating valve output fluid medium to form temperature control fluid and then output the temperature control fluid to the input port of the filter; the inlet of the mixer is connected with the outlet of the filter, the outlet of the mixer is connected with the inlet of the water pump, the outlet of the water pump is connected with the inlet of the input valve, the outlet of the input valve is connected with the interlayer of the crystallization kettle, the interlayer of the crystallization kettle is also connected with the inlet of the output valve, and the outlet of the output valve is connected with the inlet of the buffer tank;

the buffer tank is provided with a sewage discharge outlet and a mixing outlet, the sewage discharge outlet is connected with an input port of the safety valve, an output port of the safety valve is connected with an input port of the sewage discharge valve, the mixing outlet is connected with an input port of the filter, and temperature control fluid output by the buffer tank and temperature control fluid output by the compensation part are mixed in the mixer after being filtered by the filter.

In the above scheme, the pressure relief part comprises a pressure relief regulating valve, a high-temperature output cut-off valve, a low-temperature output cut-off valve and a normal-temperature output cut-off valve; the buffer tank is also provided with a pressure relief output port;

the input port of the pressure release regulating valve is connected with the pressure release output port of the buffer tank, the output port of the pressure release regulating valve is respectively connected with the input port of the high-temperature output cut-off valve, the input port of the low-temperature output cut-off valve and the input port of the normal-temperature output cut-off valve, the output port of the high-temperature output cut-off valve is connected with the input port of the high-temperature fluid input valve, the output port of the low-temperature output cut-off valve is connected with the input port of the low-temperature fluid input valve, and the output port of the normal-temperature output cut-off valve is connected with the input port of the normal-temperature fluid input valve.

In the above scheme, the gas control device comprises a gas output valve and a distributor, wherein the input port of the gas output valve inputs instrument air, and the output port of the gas output valve is connected with the distributor and outputs the instrument air to the distributor;

the distributor is respectively connected with the high-temperature input cut-off valve, the low-temperature input cut-off valve, the normal-temperature input cut-off valve, the medium regulating valve, the pressure relief regulating valve, the high-temperature output cut-off valve, the low-temperature output cut-off valve and the normal-temperature output cut-off valve and outputs instrument air.

In the above scheme, the electrical control device comprises a master control device, and a high Wen Shuru sensor, a low-temperature input sensor, a normal-temperature input sensor, a mixed output sensor, a pump output sensor, a crystallization kettle input sensor, a crystallization kettle output sensor and a buffer sensor which are respectively connected with the master control device; the master control device is also respectively connected with the high-temperature input cut-off valve, the low-temperature input cut-off valve, the normal-temperature input cut-off valve, the medium cut-off valve, the high-temperature output cut-off valve, the low-temperature output cut-off valve, the normal-temperature output cut-off valve, the medium regulating valve and the pressure relief regulating valve; the master control device is also connected with a water pump;

the high-temperature input sensor is connected to one side of an input port of the high-temperature input cut-off valve and is used for detecting the temperature of high-temperature fluid input by the high-temperature input cut-off valve, forming high-temperature information and outputting the high-temperature information to the master control device;

the low-temperature input sensor is connected to one side of an input port of the low-temperature input cut-off valve and is used for detecting the temperature of low-temperature fluid input by the low-temperature input cut-off valve, forming low-temperature information and outputting the information to the master control device;

The normal temperature input sensor is connected to one side of an input port of the normal temperature input cut-off valve and is used for detecting the temperature of normal temperature fluid input by the normal temperature input cut-off valve, forming normal temperature information and outputting the normal temperature information to the master control device;

the mixing output sensor is connected to one side of an output port of the mixer and is used for detecting the temperature of the temperature control fluid output by the mixer, forming mixing temperature information and outputting the mixing temperature information to the master control device;

the pump body output sensor is connected to one side of an output port of the water pump and is used for detecting the pressure of the temperature control fluid output by the water pump, forming pump body pressure information and outputting the information to the master control device;

the crystallization kettle sensor is connected with the crystallization kettle and is used for detecting the temperature of materials in the crystallization kettle, forming material temperature information and outputting the material temperature information to the master control device;

the crystallization kettle input sensor is connected to one side of an input port of the input valve and is used for detecting the temperature of the temperature control fluid received by the input valve, forming input temperature information and outputting the information to the master control device;

the crystallization kettle output sensor is connected to one side of an output port of the output valve and is used for detecting the temperature of the temperature control fluid output by the output valve, forming output temperature information and outputting the output temperature information to the master control device;

The buffer sensor is connected with the buffer tank and is used for detecting the pressure of the temperature control fluid in the buffer tank, forming buffer pressure information and outputting the buffer pressure information to the master control device.

In the above scheme, the filter is a Y-shaped filter; the high-temperature input cut-off valve, the low-temperature input cut-off valve, the normal-temperature input cut-off valve, the medium cut-off valve, the pressure sensor, the high-temperature output cut-off valve, the low-temperature output cut-off valve and the normal-temperature output cut-off valve are pneumatic cut-off valves respectively;

the medium regulating valve and the pressure relief regulating valve are pneumatic regulating valves respectively; the input valve, the output valve, the blow-down valve and the gas output valve are respectively manual valves; the water pump is a magnetic pump, and the fluid medium is glycol aqueous solution;

the high-temperature fluid output valve, the high-temperature fluid input valve, the low-temperature fluid output valve, the low-temperature fluid input valve, the normal-temperature fluid output valve and the normal-temperature fluid input valve are manual valves respectively.

The crystallization kettle temperature control method comprises a heating control flow, a cooling control flow, a heat preservation control flow and a pollution discharge control flow;

the heating control flow comprises the following steps:

A1. opening a high-temperature fluid output valve, a high-temperature fluid input valve, an input valve and an output valve, detecting the temperature of materials in a crystallization kettle by a master control device through a crystallization kettle sensor, forming material temperature information and outputting the material temperature information to the master control device; inputting a target temperature into the master control device, and comparing the material temperature information with the target temperature by the master control device;

A2. If the material temperature information is lower than the target temperature and the difference value between the material temperature information and the target temperature is greater than or equal to 2 ℃, entering a quick heating process, wherein the quick heating process comprises the following steps of:

A21. the master control device controls the high-temperature input cut-off valve, the high-temperature output cut-off valve, the medium cut-off valve and the medium regulating valve to be opened, and controls the water pump to be started; the main control device adjusts the opening of the medium regulating valve to the maximum;

A22. the water pump extracts high-temperature fluid from the high-temperature pipeline, and the high-temperature fluid enters the temperature control part after passing through the high-temperature input cut-off valve, the medium regulating valve and the medium cut-off valve to form temperature control fluid;

A23. the temperature control fluid is pumped by the water pump again, enters the water pump after passing through the filter and the mixer, and is output into an interlayer in the crystallization kettle by the water pump through the input valve so as to perform heat exchange on the crystallization kettle and further heat materials in the crystallization kettle;

A24. the temperature control fluid in the interlayer of the crystallization kettle flows into the buffer tank under the pressure of the water pump, and the water pump pumps the temperature control fluid in the buffer tank, so that the temperature control fluid in the buffer tank sequentially passes through the filter and the mixer and enters the water pump again;

A25. The water pump further continuously extracts high-temperature fluid in the high-temperature pipeline, and enables the high-temperature fluid and the temperature control fluid to be fully mixed in the mixer so as to ensure that the temperature of the temperature control fluid output by the water pump is always higher than the target temperature;

A26. the master control device also senses the pressure of the temperature control fluid in the buffer tank through the buffer sensor and acquires buffer pressure information; the main control device is internally provided with a pressure threshold value, if the buffer pressure information is higher than the pressure threshold value, the main control device controls the pressure release regulating valve to be opened, and the temperature control fluid in the buffer tank flows back to the high-temperature pipeline through the pressure release regulating valve and the high-temperature output cut-off valve;

A3. if the material temperature information is lower than the target temperature and the difference between the material temperature information and the target temperature is lower than 2 ℃, entering a slow heating process, wherein the slow heating process comprises the following steps of:

A31. the master control device controls the high-temperature input cut-off valve, the high-temperature output cut-off valve and the medium regulating valve to be opened, and controls the water pump to be started; the control device also controls the medium cut-off valve to be closed;

A32. the water pump extracts high-temperature fluid from the high-temperature pipeline, and the high-temperature fluid enters the temperature control part after passing through the high-temperature input cut-off valve, the medium regulating valve and the medium cut-off valve to form temperature control fluid;

A33. The temperature control fluid is pumped by the water pump again, enters the water pump after passing through the filter and the mixer, and is output into an interlayer in the crystallization kettle by the water pump through the input valve so as to perform heat exchange on the crystallization kettle and further heat materials in the crystallization kettle;

A34. the temperature control fluid in the interlayer of the crystallization kettle flows into the buffer tank under the pressure of the water pump, and the water pump pumps the temperature control fluid in the buffer tank, so that the temperature control fluid in the buffer tank sequentially passes through the filter and the mixer and enters the water pump again;

A35. the water pump further continuously pumps high-temperature fluid in the high-temperature pipeline, and enables the high-temperature fluid and the temperature control fluid to be fully mixed in the mixer; simultaneously, the master control device also controls the opening of the medium regulating valve to control the flow of the high-temperature fluid input to the temperature control part, so as to ensure that the temperature of the temperature control fluid output by the water pump is always equal to the target temperature;

A36. the master control device also senses the pressure of the temperature control fluid in the buffer tank through the buffer sensor and acquires buffer pressure information; the main control device is internally provided with a pressure threshold value, if the buffer pressure information is higher than the pressure threshold value, the main control device controls the pressure release regulating valve to be opened, and the temperature control fluid in the buffer tank flows back to the high-temperature pipeline through the pressure release regulating valve and the high-temperature output cut-off valve;

A4. And when the material temperature information is equal to the target temperature, entering a heat preservation process.

The cooling control flow comprises the following steps:

B1. opening a low-temperature fluid output valve, a low-temperature fluid input valve, an input valve and an output valve, detecting the temperature of materials in a crystallization kettle by a master control device through a crystallization kettle sensor, forming material temperature information and outputting the material temperature information to the master control device; inputting a target temperature into the master control device, and comparing the material temperature information with the target temperature by the master control device;

B2. if the material temperature information is higher than the target temperature and the difference value between the material temperature information and the target temperature is greater than or equal to 2 ℃, entering a rapid cooling process, wherein the rapid cooling process comprises the following steps of:

B21. the master control device controls the low-temperature input cut-off valve, the low-temperature output cut-off valve, the medium cut-off valve and the medium regulating valve to be opened and controls the water pump to be started; the main control device adjusts the opening of the medium regulating valve to the maximum;

B22. the water pump extracts low-temperature fluid from the low-temperature pipeline, and the low-temperature fluid enters the temperature control part after passing through the low-temperature input cut-off valve, the medium regulating valve and the medium cut-off valve to form temperature control fluid;

B23. The temperature control fluid is pumped by the water pump again, enters the water pump after passing through the filter and the mixer, and is output into an interlayer in the crystallization kettle by the water pump through the input valve so as to perform heat exchange on the crystallization kettle and further cool materials in the crystallization kettle;

B24. the temperature control fluid in the interlayer of the crystallization kettle flows into the buffer tank under the pressure of the water pump, and the water pump pumps the temperature control fluid in the buffer tank, so that the temperature control fluid in the buffer tank sequentially passes through the filter and the mixer and enters the water pump again;

B25. the water pump further continuously extracts low-temperature fluid in the low-temperature pipeline, and enables the low-temperature fluid and the temperature control fluid to be fully mixed in the mixer so as to ensure that the temperature of the temperature control fluid output by the water pump is always lower than the target temperature;

B26. the master control device also senses the pressure of the temperature control fluid in the buffer tank through the buffer sensor and acquires buffer pressure information; the total control device is provided with a pressure threshold, if the buffer pressure information is higher than the pressure threshold, the total control device controls the pressure release regulating valve to be opened, and the temperature control fluid in the buffer tank flows back to the low-temperature pipeline through the pressure release regulating valve and the low-temperature output cut-off valve;

B3. If the material temperature information is lower than the target temperature and the difference between the material temperature information and the target temperature is lower than 2 ℃, entering a slow cooling process, wherein the slow cooling process comprises the following steps of:

B31. the master control device controls the low-temperature input cut-off valve, the low-temperature output cut-off valve and the medium regulating valve to be opened and controls the water pump to be started; the control device also controls the medium cut-off valve to be closed;

B32. the water pump extracts low-temperature fluid from the low-temperature pipeline, and the low-temperature fluid enters the temperature control part after passing through the low-temperature input cut-off valve, the medium regulating valve and the medium cut-off valve to form temperature control fluid;

B33. the temperature control fluid is pumped by the water pump again, enters the water pump after passing through the filter and the mixer, and is output into an interlayer in the crystallization kettle by the water pump through the input valve so as to perform heat exchange on the crystallization kettle and further cool materials in the crystallization kettle;

B34. the temperature control fluid in the interlayer of the crystallization kettle flows into the buffer tank under the pressure of the water pump, and the water pump pumps the temperature control fluid in the buffer tank, so that the temperature control fluid in the buffer tank sequentially passes through the filter and the mixer and enters the water pump again;

B35. The water pump further continuously pumps the low-temperature fluid in the low-temperature pipeline and enables the low-temperature fluid and the temperature control fluid to be fully mixed in the mixer; simultaneously, the master control device also controls the opening of the medium regulating valve to control the flow of the low-temperature fluid input to the temperature control part, so as to ensure that the temperature of the temperature control fluid output by the water pump is always equal to the target temperature;

B36. the master control device also senses the pressure of the temperature control fluid in the buffer tank through the buffer sensor and acquires buffer pressure information; the total control device is provided with a pressure threshold, if the buffer pressure information is higher than the pressure threshold, the total control device controls the pressure release regulating valve to be opened, and the temperature control fluid in the buffer tank flows back to the low-temperature pipeline through the pressure release regulating valve and the low-temperature output cut-off valve;

B4. and when the material temperature information is equal to the target temperature, entering a heat preservation process.

The heat preservation control flow comprises the following steps:

C1. opening a normal temperature fluid output valve, a normal temperature fluid input valve, an input valve and an output valve, detecting the temperature of materials in a crystallization kettle by a crystallization kettle sensor by a master control device, and forming material temperature information and outputting the material temperature information to the master control device; inputting a target temperature into the master control device, and comparing the material temperature information with the target temperature by the master control device;

C2. If the material temperature information is higher or lower than the target temperature and the difference value between the material temperature information and the target temperature is smaller than 1 ℃, the master control device controls the normal temperature input cut-off valve, the normal temperature output cut-off valve, the medium cut-off valve and the medium regulating valve to be opened and controls the water pump to be started;

C22. the water pump extracts normal-temperature fluid from the normal-temperature pipeline, and the normal-temperature fluid enters the temperature control part and forms temperature control fluid after being input into the cut-off valve, the medium regulating valve and the medium cut-off valve at normal temperature;

C23. the temperature control fluid is pumped by the water pump again, enters the water pump after passing through the filter and the mixer, and is output into an interlayer in the crystallization kettle by the water pump through the input valve so as to perform heat exchange on the crystallization kettle and further heat materials in the crystallization kettle;

C24. the temperature control fluid in the interlayer of the crystallization kettle flows into the buffer tank under the pressure of the water pump, and the water pump pumps the temperature control fluid in the buffer tank, so that the temperature control fluid in the buffer tank sequentially passes through the filter and the mixer and enters the water pump again;

C25. the water pump further continuously pumps normal-temperature fluid in the normal-temperature pipeline, and enables the normal-temperature fluid and the temperature control fluid to be fully mixed in the mixer so as to ensure that the temperature of the temperature control fluid output by the water pump is always equal to the target temperature;

C26. The master control device also senses the pressure of the temperature control fluid in the buffer tank through the buffer sensor and acquires buffer pressure information; the total control device is provided with a pressure threshold, if the buffer pressure information is higher than the pressure threshold, the total control device controls the pressure release regulating valve to be opened, and the temperature control fluid in the buffer tank flows back to the normal temperature pipeline through the pressure release regulating valve and the normal temperature output cut-off valve;

C3. if the material temperature information is lower than the target temperature and the difference between the material temperature information and the target temperature is greater than 1 ℃, entering the slow heating process;

C4. if the material temperature information is higher than the target temperature and the difference between the material temperature information and the target temperature is greater than 1 ℃, entering the slow cooling process;

the pollution discharge control flow comprises the following steps:

D1. opening a normal-temperature fluid output valve, an input valve, an output valve and a drain valve, wherein the master control device controls the normal-temperature input cut-off valve, the medium cut-off valve and the medium regulating valve to be opened and controls the water pump to be started;

D2. the water pump extracts normal-temperature fluid from the normal-temperature pipeline, and the normal-temperature fluid enters the temperature control part and forms temperature control fluid after being input into the cut-off valve, the medium regulating valve and the medium cut-off valve at normal temperature;

D3. The temperature control fluid is pumped by the water pump again, enters the water pump after passing through the filter and the mixer, and is output into an interlayer in the crystallization kettle by the water pump through the input valve;

D4. the temperature control fluid in the interlayer of the crystallization kettle flows into the buffer tank under the pressure of the water pump, and the pressure of the temperature control fluid in the buffer tank is continuously increased along with the continuous filling of the temperature control fluid in the buffer tank until the pressure reaches the threshold value of the safety valve;

D5. when the pressure of the temperature control fluid in the buffer tank exceeds the threshold value of the safety valve, the temperature control fluid in the buffer tank passes through the safety valve runner blow-down valve and flows out to the outside through the blow-down valve.

The invention has the advantages and beneficial effects that: the invention provides a crystallization kettle temperature control system and a crystallization kettle temperature control method. According to the technical scheme, based on a crystallization kettle temperature control system, a heating control flow, a cooling control flow and a heat preservation control flow are adopted, the temperature of the ethylene glycol aqueous solution is controlled to reach the temperature of materials in the crystallization kettle by utilizing a water pump, and the crystallization kettle is subjected to heat exchange, so that compared with the existing temperature control mode with larger hysteresis, the control precision is improved, the accurate control of the temperature of the materials in the crystallization kettle is realized, the overshoot phenomenon generated by the temperature control of the materials in the prior art is avoided, and the crystallization process is further controlled better;

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a schematic diagram of a crystallization kettle, a medium pipe, a medium control device and an electric control device in a crystallization kettle temperature control system according to the present invention;

FIG. 2 is a schematic diagram of a gas control device in a crystallization kettle temperature control system according to the present invention.

In the figure: 1. medium pipe 2, medium control device 3, gas control device

4. Electric control equipment 5, crystallization kettle 11, high-temperature pipeline 12 and low-temperature pipeline

13. Normal temperature pipeline 14, high temperature fluid output valve 15, high temperature fluid input valve

16. Cryogenic fluid output valve 17 and cryogenic fluid input valve

18. Normal temperature fluid output valve 19 and normal temperature fluid input valve

21. Compensation part 22, temperature control part 23 and pressure relief part

211. High temperature input cut-off valve 212 and low temperature input cut-off valve

213. Normal temperature input shutoff valve 214, medium shutoff valve 215, medium regulating valve

221. Filter 222, mixer 223, water pump 224, buffer tank

225. Input valve 226, output valve 227, relief valve 228, and blowdown valve

2241. Pressure release output 2242, blowdown output 2243, and mixing output

231. Pressure release regulating valve 232, high temperature output cut-off valve 233, and low temperature output cut-off valve

234. Normal temperature output cut-off valve 31, gas output valve 32, distributor 33, drain valve

41. High-temperature input sensor 42, low-temperature input sensor 43, and normal-temperature input sensor

44. Mixing output sensor 45, pump output sensor 46, crystallization kettle sensor

47. Crystallization kettle input sensor 48 and crystallization kettle output sensor 49 buffer sensor

Detailed Description

The following describes the embodiments of the present invention further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.

As shown in fig. 1 and 2, the present invention is a crystallization kettle temperature control system for controlling the temperature of a crystallization kettle 5, comprising:

a medium conduit 1 having a fluid medium (not shown) therein;

the medium control device 2 is respectively connected with the medium pipeline 1 and the crystallization kettle 5; the medium control device 2 controls the temperature of a temperature control fluid (not shown in the figure) in the medium control device 2 by controlling the input amount of the fluid medium, and/or the kind of the fluid medium input; the medium control device 2 controls the temperature of the crystallization kettle 5 through a temperature control fluid;

a gas control device 3 connected to the medium control device 2 for outputting instrument air to the medium control device 2;

And the electric control device 4 is respectively connected with the medium control device 2 and the crystallization kettle 5 and is used for sensing the temperature of the fluid medium, the temperature control fluid, the medium control device 2 and the materials in the crystallization kettle 5 and controlling the input quantity of the fluid medium of the medium control device 2 and the type of the fluid medium input according to the temperature of the fluid medium, the temperature control fluid, the medium control device 2 and the materials.

Specifically, the types of the fluid medium in the medium pipe 1 include high-temperature fluid, low-temperature fluid and normal-temperature fluid;

the medium pipeline 1 comprises a high-temperature pipeline 11 filled with high-temperature fluid, a low-temperature pipeline 12 filled with low-temperature fluid and a normal-temperature pipeline 13 filled with normal-temperature fluid;

the output end of the high-temperature pipeline 11 is connected with a high-temperature fluid output valve 14, and the input end of the high-temperature pipeline 11 is connected with a high-temperature fluid input valve 15; the output end of the low-temperature pipeline 12 is connected with a low-temperature fluid output valve 16, and the input end of the low-temperature pipeline 12 is connected with a low-temperature fluid input valve 17; the output end of the normal temperature pipeline 13 is connected with a normal temperature fluid output valve 18, and the input end of the normal temperature pipeline 13 is connected with a normal temperature fluid input valve 19.

Further, the medium control apparatus 2 includes:

a compensation part 21 connected to the high temperature fluid output valve 14, the low temperature fluid output valve 16, and the normal temperature fluid output valve 18, respectively, to receive the high temperature fluid, the low temperature fluid, and the normal temperature fluid;

The temperature control part 22 is respectively connected with the compensation part 21 and the crystallization kettle 5 to receive high-temperature fluid, low-temperature fluid or normal-temperature fluid and then form temperature control fluid so as to heat, cool or preserve heat of the crystallization kettle 5;

a pressure release part 23 connected to the temperature control part 22 to control the pressure of the temperature control part 22; the pressure release portion 23 is also connected to the high temperature fluid input valve 15, the low temperature fluid input valve 17, and the normal temperature fluid input valve 19, respectively, to output the temperature control fluid.

Further, the compensation portion 21 includes a high Wen Shuru shut-off valve 211, a low temperature input shut-off valve 212, a normal temperature input shut-off valve 213, a medium shut-off valve 214, and a medium regulating valve 215;

the input port of the high-temperature input cut-off valve 211 is connected with the output port of the high-temperature fluid output valve 14, and the output port of the high Wen Shuru cut-off valve 211 is respectively connected with the medium cut-off valve 214 and the medium regulating valve 215;

the input port of the low-temperature input cut-off valve 212 is connected with the output port of the low-temperature fluid output valve 16, and the output port of the low-temperature input cut-off valve 212 is connected with the medium cut-off valve 214 and the medium regulating valve 215 respectively;

the input port of the normal temperature input cut-off valve 213 is connected to the output port of the normal temperature fluid output valve 18, and the output port of the normal temperature input cut-off valve 213 is connected to the medium cut-off valve 214 and the medium regulating valve 215, respectively;

The medium cut-off valve 214 and the medium adjustment valve 215 have output ports connected to the temperature control unit 22, respectively.

Further, the temperature control part 22 includes a filter 221, a mixer 222, a water pump 223, a buffer tank 224, an input valve 225, an output valve 226, a safety valve 227, and a drain valve 228;

the input port of the filter 221 is connected with the output ports of the medium cut-off valve 214 and the medium regulating valve 215 respectively, and the medium cut-off valve 214 and the medium regulating valve 215 output the fluid medium to form temperature control fluid and then output the temperature control fluid to the input port of the filter 221; the input port of the mixer 222 is connected with the output port of the filter 221, the output port of the mixer 222 is connected with the input port of the water pump 223, the output port of the water pump 223 is connected with the input port of the input valve 225, the output port of the input valve 225 is connected with the interlayer of the crystallization kettle 5, the interlayer of the crystallization kettle 5 is also connected with the input port of the output valve 226, and the output port of the output valve 226 is connected with the input port of the buffer tank 224;

the buffer tank 224 has a drain outlet 2242 and a mixing outlet 2243, the drain outlet 2242 is connected to an input port of the relief valve 227, an output port of the relief valve 227 is connected to an input port of the drain valve 228, the mixing outlet 2243 is connected to an input port of the filter 221, and the temperature control fluid output from the buffer tank 224 and the temperature control fluid output from the compensation section 21 are filtered by the filter 221 and then mixed in the mixer 222.

Further, the pressure release portion 23 includes a pressure release regulating valve 231, a high temperature output cut-off valve 232, a low temperature output cut-off valve 233, and a normal temperature output cut-off valve 234; buffer tank 224 also has a pressure relief output 2241;

the input port of the pressure release regulating valve 231 is connected to the pressure release output port 2241 of the buffer tank 224, the output port of the pressure release regulating valve 231 is connected to the input port of the high-temperature output cut-off valve 232, the input port of the low-temperature output cut-off valve 233 and the input port of the normal-temperature output cut-off valve 234, the output port of the high-temperature output cut-off valve 232 is connected to the input port of the high-temperature fluid input valve 15, the output port of the low-temperature output cut-off valve 233 is connected to the input port of the low-temperature fluid input valve 17, and the output port of the normal-temperature output cut-off valve 234 is connected to the input port of the normal-temperature fluid input valve 19.

Further, the gas control apparatus 3 includes a gas output valve 31 and a distributor 32, an input port of the gas output valve 31 inputs instrument air, an output port of the gas output valve 31 is connected to the distributor 32, and instrument air is output to the distributor 32;

the dispenser 32 is connected to the high Wen Shuru shut-off valve 211, the low temperature input shut-off valve 212, the normal temperature input shut-off valve 213, the medium shut-off valve 214, the medium regulating valve 215, the pressure release regulating valve 231, the high temperature output shut-off valve 232, the low temperature output shut-off valve 233, and the normal temperature output shut-off valve 234, respectively, and outputs instrument air.

Preferably, the gas control apparatus 3 further includes a drain valve 33, an input port of the drain valve 33 is connected to the dispenser 32, and water in the dispenser 32 is output to the outside through the drain valve 33.

Further, the electrical control apparatus 4 includes a master control device (not shown in the figure), and a high Wen Shuru sensor 41, a low temperature input sensor 42, a normal temperature input sensor 43, a mixed output sensor 44, a pump output sensor 45, a crystallization kettle sensor 46, a crystallization kettle input sensor 47, a crystallization kettle output sensor 48, and a buffer sensor 49, which are respectively connected to the master control device; the master control device is also respectively connected with a high Wen Shuru cut-off valve 211, a low-temperature input cut-off valve 212, a normal-temperature input cut-off valve 213, a medium cut-off valve 214, a high-temperature output cut-off valve 232, a low-temperature output cut-off valve 233, a normal-temperature output cut-off valve 234, a medium regulating valve 215 and a pressure release regulating valve 231; the master control device is also connected with a water pump 223;

the high temperature input sensor 41 is connected to the input port side of the high Wen Shuru cut-off valve 211, and is used for detecting the temperature of the high temperature fluid input by the high temperature input cut-off valve 211, forming high temperature information and outputting the high temperature information to the master control device;

the low temperature input sensor 42 is connected to the input port side of the low temperature input cut-off valve 212, and is configured to detect the temperature of the low temperature fluid input by the low temperature input cut-off valve 212, form low temperature information, and output the information to the master control device;

The normal temperature input sensor 43 is connected to the input port side of the normal temperature input cut-off valve 213, and is configured to detect the temperature of the normal temperature fluid input by the normal temperature input cut-off valve 213, form normal temperature information, and output the normal temperature information to the master control device;

the mixing output sensor 44 is connected to one side of the output port of the mixer 222, and is configured to detect the temperature of the temperature-controlled fluid output by the mixer 222, form mixed temperature information, and output the mixed temperature information to the master control device;

the pump body output sensor 45 is connected to one side of an output port of the water pump 223, and is used for detecting the pressure of the temperature control fluid output by the water pump 223, forming pump body pressure information and outputting the information to the master control device; the main control device is internally provided with a pump body pressure threshold value, judges whether the temperature control fluid in the temperature control part 22 is sufficient or not according to the pump body pressure information, and if the pump body pressure information is lower than the pump body pressure threshold value, the main control device increases the opening degree of the medium regulating valve 215 or opens the medium cut-off valve 214 to ensure that the temperature control part 22 has sufficient temperature control fluid;

the crystallization kettle sensor 46 is connected with the crystallization kettle 5 and is used for detecting the temperature of materials in the crystallization kettle 5, forming material temperature information and outputting the material temperature information to the master control device;

the crystallization kettle input sensor 47 is connected to one side of the input port of the input valve 225, and is used for detecting the temperature of the temperature control fluid received by the input valve 225, forming input temperature information, and outputting the information to the master control device; the total control device calculates the difference between the normal temperature information and the input temperature information and is used as an actual loss value, if the actual loss value is smaller than the rated loss value, the total control device judges that the crystallization kettle temperature control system is normal, and if the actual loss value is larger than the rated loss value, the total control device judges that the crystallization kettle temperature control system has the defect of temperature loss and outputs a defect alarm so as to facilitate the staff to maintain the crystallization kettle temperature control system in time;

The crystallization kettle output sensor 48 is connected to one side of an output port of the output valve 226, and is used for detecting the temperature of the temperature control fluid output by the output valve 226, forming output temperature information and outputting the output temperature information to the master control device;

the buffer sensor 49 is connected to the buffer tank 224, and is configured to detect the pressure of the temperature-controlled fluid in the buffer tank 224, form buffer pressure information, and output the buffer pressure information to the master control device.

Preferably, the filter 221 is a Y-filter 221; the high temperature input cutoff valve 211, the low temperature input cutoff valve 212, the normal temperature input cutoff valve 213, the medium cutoff valve 214, the pressure sensor, the high temperature output cutoff valve 232, the low temperature output cutoff valve 233, and the normal temperature output cutoff valve 234 are pneumatic cutoff valves, respectively;

the medium regulating valve 215 and the pressure release regulating valve 231 are respectively pneumatic regulating valves; the input valve 225, the output valve 226, the blowdown valve 228 and the gas output valve 31 are manual valves, respectively; the water pump 223 is a magnetic pump, and the fluid medium is glycol water solution;

the high-temperature fluid output valve 14, the high-temperature fluid input valve 15, the low-temperature fluid output valve 16, the low-temperature fluid input valve 17, the normal-temperature fluid output valve 18, and the normal-temperature fluid input valve 19 are manual valves, respectively.

The heating control flow comprises the following steps:

A1. the high-temperature fluid output valve 14, the high-temperature fluid input valve 15, the input valve 225 and the output valve 226 are opened, and the master control device detects the temperature of the materials in the crystallization kettle 5 through the crystallization kettle sensor 46 and forms material temperature information to be output to the master control device; inputting a target temperature into a master control device, and comparing the material temperature information with the target temperature by the master control device;

A2. if the material temperature information is lower than the target temperature and the difference value between the material temperature information and the target temperature is greater than or equal to 2 ℃, entering a rapid heating process, wherein the rapid heating process comprises the following steps of:

A21. the master control device controls the high-temperature input cut-off valve 211, the high-temperature output cut-off valve 232, the medium cut-off valve 214 and the medium regulating valve 215 to be opened, and controls the water pump 223 to be started; the master control device adjusts the opening of the medium regulating valve 215 to the maximum;

A22. the water pump 223 extracts high-temperature fluid from the high-temperature pipeline 11, and the high-temperature fluid enters the temperature control part 22 after passing through the high-temperature input cut-off valve 211, the medium regulating valve 215 and the medium cut-off valve 214 to form temperature control fluid;

A23. the temperature control fluid is pumped by the water pump 223 again, enters the water pump 223 after passing through the filter 221 and the mixer 222, and the water pump 223 outputs the temperature control fluid into the interlayer in the crystallization kettle 5 through the input valve 225 so as to perform heat exchange on the crystallization kettle 5 and further heat materials in the crystallization kettle 5;

A24. The temperature control fluid in the interlayer of the crystallization kettle 5 flows into the buffer tank 224 under the pressure of the water pump 223, the water pump 223 pumps the temperature control fluid in the buffer tank 224, and the temperature control fluid in the buffer tank 224 sequentially passes through the filter 221 and the mixer 222 and then enters the water pump 223 again;

A25. the water pump 223 will also continue to pump the high temperature fluid in the high temperature pipeline 11, and make the high temperature fluid and the temperature control fluid fully mixed in the mixer 222, so as to ensure that the temperature of the temperature control fluid output by the water pump 223 is always higher than the target temperature;

wherein, the master control device determines the temperature of the temperature control fluid output by the water pump 223 through the input temperature information;

A26. the master control device also senses the pressure of the temperature control fluid in the buffer tank 224 through the buffer sensor 49 and acquires buffer pressure information; the main control device is provided with a pressure threshold value, if the buffer pressure information is higher than the pressure threshold value, the main control device controls the pressure release regulating valve 231 to be opened, and the temperature control fluid in the buffer tank 224 flows back to the high-temperature pipeline 11 through the pressure release regulating valve 231 and the high-temperature output cut-off valve 232;

A3. if the material temperature information is lower than the target temperature and the difference between the material temperature information and the target temperature is lower than 2 ℃, the slow heating process is started, and the slow heating process comprises the following steps:

A31. The main control device controls the high-temperature input cut-off valve 211, the high-temperature output cut-off valve 232 and the medium regulating valve 215 to be opened, and controls the water pump 223 to be started; the control device also controls the medium shut-off valve 214 to close;

A32. the water pump 223 extracts high-temperature fluid from the high-temperature pipeline 11, and the high-temperature fluid enters the temperature control part 22 after passing through the high-temperature input cut-off valve 211, the medium regulating valve 215 and the medium cut-off valve 214 to form temperature control fluid;

A33. the temperature control fluid is pumped by the water pump 223 again, enters the water pump 223 after passing through the filter 221 and the mixer 222, and the water pump 223 outputs the temperature control fluid into the interlayer in the crystallization kettle 5 through the input valve 225 so as to perform heat exchange on the crystallization kettle 5 and further heat materials in the crystallization kettle 5;

A34. the temperature control fluid in the interlayer of the crystallization kettle 5 flows into the buffer tank 224 under the pressure of the water pump 223, the water pump 223 pumps the temperature control fluid in the buffer tank 224, and the temperature control fluid in the buffer tank 224 sequentially passes through the filter 221 and the mixer 222 and then enters the water pump 223 again;

A35. the water pump 223 will also continue to pump the high temperature fluid in the high temperature pipe 11 and mix the high temperature fluid and the temperature control fluid thoroughly in the mixer 222; meanwhile, the master control device also controls the opening of the medium regulating valve 215 to control the flow rate of the high-temperature fluid input to the temperature control part 22, so as to ensure that the temperature of the temperature control fluid output by the water pump 223 is always equal to the target temperature;

Wherein, the total control device determines the temperature of the temperature control fluid output by the water pump 223 through the input temperature information, and controls the opening of the medium regulating valve 215 according to the high temperature information and the output temperature information, so that the input temperature information is always equal to the target temperature;

A36. the master control device also senses the pressure of the temperature control fluid in the buffer tank 224 through the buffer sensor 49 and acquires buffer pressure information; the main control device is provided with a pressure threshold value, if the buffer pressure information is higher than the pressure threshold value, the main control device controls the pressure release regulating valve 231 to be opened, and the temperature control fluid in the buffer tank 224 flows back to the high-temperature pipeline 11 through the pressure release regulating valve 231 and the high-temperature output cut-off valve 232;

The cooling control flow comprises the following steps:

B1. the low-temperature fluid output valve 16, the low-temperature fluid input valve 17, the input valve 225 and the output valve 226 are opened, and the master control device detects the temperature of the materials in the crystallization kettle 5 through the crystallization kettle sensor 46 and forms material temperature information to be output to the master control device; inputting a target temperature into a master control device, and comparing the material temperature information with the target temperature by the master control device;

B21. the master control device controls the low-temperature input cut-off valve 212, the low-temperature output cut-off valve 233, the medium cut-off valve 214 and the medium regulating valve 215 to be opened, and controls the water pump 223 to be started; the master control device adjusts the opening of the medium regulating valve 215 to the maximum;

B22. the water pump 223 extracts low-temperature fluid from the low-temperature pipe 12, and the low-temperature fluid enters the temperature control unit 22 through the low-temperature input shut-off valve 212, the medium control valve 215, and the medium shut-off valve 214 to form temperature control fluid;

B23. the temperature control fluid is pumped by the water pump 223 again, enters the water pump 223 after passing through the filter 221 and the mixer 222, and the water pump 223 outputs the temperature control fluid into the interlayer in the crystallization kettle 5 through the input valve 225 so as to perform heat exchange on the crystallization kettle 5 and further cool the materials in the crystallization kettle 5;

B24. the temperature control fluid in the interlayer of the crystallization kettle 5 flows into the buffer tank 224 under the pressure of the water pump 223, the water pump 223 pumps the temperature control fluid in the buffer tank 224, and the temperature control fluid in the buffer tank 224 sequentially passes through the filter 221 and the mixer 222 and then enters the water pump 223 again;

B25. The water pump 223 will also continue to pump the low-temperature fluid in the low-temperature pipeline 12, and make the low-temperature fluid and the temperature control fluid fully mixed in the mixer 222, so as to ensure that the temperature of the temperature control fluid output by the water pump 223 is always lower than the target temperature;

B26. the master control device also senses the pressure of the temperature control fluid in the buffer tank 224 through the buffer sensor 49 and acquires buffer pressure information; the main control device is provided with a pressure threshold value, if the buffer pressure information is higher than the pressure threshold value, the main control device controls the pressure release regulating valve 231 to be opened, and the temperature control fluid in the buffer tank 224 flows back to the low-temperature pipeline 12 through the pressure release regulating valve 231 and the low-temperature output cut-off valve 233;

B31. the master control device controls the low-temperature input cut-off valve 212, the low-temperature output cut-off valve 233 and the medium regulating valve 215 to be opened, and controls the water pump 223 to be started; the control device also controls the medium shut-off valve 214 to close;

B32. the water pump 223 extracts low-temperature fluid from the low-temperature pipe 12, and the low-temperature fluid enters the temperature control unit 22 through the low-temperature input shut-off valve 212, the medium control valve 215, and the medium shut-off valve 214 to form temperature control fluid;

B33. The temperature control fluid is pumped by the water pump 223 again, enters the water pump 223 after passing through the filter 221 and the mixer 222, and the water pump 223 outputs the temperature control fluid into the interlayer in the crystallization kettle 5 through the input valve 225 so as to perform heat exchange on the crystallization kettle 5 and further cool the materials in the crystallization kettle 5;

B34. the temperature control fluid in the interlayer of the crystallization kettle 5 flows into the buffer tank 224 under the pressure of the water pump 223, the water pump 223 pumps the temperature control fluid in the buffer tank 224, and the temperature control fluid in the buffer tank 224 sequentially passes through the filter 221 and the mixer 222 and then enters the water pump 223 again;

B35. the water pump 223 will also continue to pump the cryogenic fluid in the cryogenic conduit 12 and mix the cryogenic fluid and the temperature control fluid thoroughly within the mixer 222; meanwhile, the master control device also controls the opening of the medium regulating valve 215 to control the flow rate of the low-temperature fluid input to the temperature control part 22, so as to ensure that the temperature of the temperature control fluid output by the water pump 223 is always equal to the target temperature;

wherein, the total control device determines the temperature of the temperature control fluid output by the water pump 223 through the input temperature information, and controls the opening of the medium regulating valve 215 according to the low temperature information and the output temperature information, so that the input temperature information is always equal to the target temperature;

B36. The master control device also senses the pressure of the temperature control fluid in the buffer tank 224 through the buffer sensor 49 and acquires buffer pressure information; the main control device is provided with a pressure threshold value, if the buffer pressure information is higher than the pressure threshold value, the main control device controls the pressure release regulating valve 231 to be opened, and the temperature control fluid in the buffer tank 224 flows back to the low-temperature pipeline 12 through the pressure release regulating valve 231 and the low-temperature output cut-off valve 233;

The heat preservation control flow comprises the following steps:

C1. the normal temperature fluid output valve 18, the normal temperature fluid input valve 19, the input valve 225 and the output valve 226 are opened, the master control device detects the temperature of the materials in the crystallization kettle 5 through the crystallization kettle sensor 46, and material temperature information is formed and output to the master control device; inputting a target temperature into a master control device, and comparing the material temperature information with the target temperature by the master control device;

C2. if the material temperature information is higher or lower than the target temperature and the difference between the material temperature information and the target temperature is less than 1 ℃, the master control device controls the normal temperature input cut-off valve 213, the normal temperature output cut-off valve 234, the medium cut-off valve 214 and the medium regulating valve 215 to be opened and controls the water pump 223 to be started;

C22. The water pump 223 extracts normal temperature fluid from the normal temperature pipeline 13, and the normal temperature fluid enters the temperature control part 22 after being input into the cut-off valve 213, the medium regulating valve 215 and the medium cut-off valve 214 at normal temperature to form temperature control fluid;

C23. the temperature control fluid is pumped by the water pump 223 again, enters the water pump 223 after passing through the filter 221 and the mixer 222, and the water pump 223 outputs the temperature control fluid into the interlayer in the crystallization kettle 5 through the input valve 225 so as to perform heat exchange on the crystallization kettle 5 and further heat materials in the crystallization kettle 5;

C24. the temperature control fluid in the interlayer of the crystallization kettle 5 flows into the buffer tank 224 under the pressure of the water pump 223, the water pump 223 pumps the temperature control fluid in the buffer tank 224, and the temperature control fluid in the buffer tank 224 sequentially passes through the filter 221 and the mixer 222 and then enters the water pump 223 again;

C25. the water pump 223 will also continue to pump the normal temperature fluid in the normal temperature pipeline 13, and make the normal temperature fluid and the temperature control fluid fully mixed in the mixer 222, so as to ensure that the temperature of the temperature control fluid output by the water pump 223 is always equal to the target temperature;

wherein, the total control device determines the temperature of the temperature control fluid output by the water pump 223 through the input temperature information, and controls the opening of the medium regulating valve 215 according to the normal temperature information and the output temperature information, so that the input temperature information is always equal to the target temperature;

C26. The master control device also senses the pressure of the temperature control fluid in the buffer tank 224 through the buffer sensor 49 and acquires buffer pressure information; the main control device is provided with a pressure threshold value, if the buffer pressure information is higher than the pressure threshold value, the main control device controls the pressure release regulating valve 231 to be opened, and the temperature control fluid in the buffer tank 224 flows back to the normal temperature pipeline 13 through the pressure release regulating valve 231 and the normal temperature output cut-off valve 234;

C3. if the material temperature information is lower than the target temperature and the difference between the material temperature information and the target temperature is greater than 1 ℃, the slow heating process is started;

C4. if the material temperature information is higher than the target temperature and the difference between the material temperature information and the target temperature is greater than 1 ℃, entering a slow cooling process;

the pollution discharge control flow comprises the following steps:

D1. opening the normal temperature fluid output valve 18, the input valve 225, the output valve 226 and the blowdown valve 228, the master control device controls the normal temperature input cut-off valve 213, the medium cut-off valve 214 and the medium regulating valve 215 to be opened, and controls the water pump 223 to be started;

D2. the water pump 223 extracts normal temperature fluid from the normal temperature pipeline 13, and the normal temperature fluid enters the temperature control part 22 after being input into the cut-off valve 213, the medium regulating valve 215 and the medium cut-off valve 214 at normal temperature to form temperature control fluid;

D3. The temperature control fluid is pumped by the water pump 223 again, enters the water pump 223 after passing through the filter 221 and the mixer 222, and the water pump 223 outputs the temperature control fluid into the interlayer in the crystallization kettle 5 through the input valve 225;

D4. the temperature control fluid in the interlayer of the crystallization kettle 5 flows into the buffer tank 224 under the pressure of the water pump 223, and as the temperature control fluid is continuously filled into the buffer tank 224, the pressure of the temperature control fluid in the buffer tank 224 is continuously increased until the threshold value of the safety valve 227 is reached;

D5. when the pressure of the temperature control fluid in the buffer tank 224 exceeds the threshold value of the relief valve 227, the temperature control fluid in the buffer tank 224 will flow through the relief valve 227, through the drain valve 228, and out to the outside through the drain valve 228.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims

1. The crystallization kettle temperature control method is characterized by comprising a heating control flow, a cooling control flow, a heat preservation control flow and a pollution discharge control flow;

the heating control flow comprises the following steps:

A4. When the material temperature information is equal to the target temperature, entering a heat preservation control flow;

the cooling control flow comprises the following steps:

B21. the master control device is used for controlling the low-temperature input cut-off valve, the low-temperature output cut-off valve, the medium cut-off valve and the medium regulating valve to be opened and controlling the water pump to be started; the main control device adjusts the opening of the medium regulating valve to the maximum;

B4. when the material temperature information is equal to the target temperature, entering a heat preservation control flow;

the heat preservation control flow comprises the following steps:

the pollution discharge control flow comprises the following steps: