CN213021084U - Cooling water temperature control device for polyurethane production - Google Patents
Cooling water temperature control device for polyurethane production Download PDFInfo
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- CN213021084U CN213021084U CN202021757750.0U CN202021757750U CN213021084U CN 213021084 U CN213021084 U CN 213021084U CN 202021757750 U CN202021757750 U CN 202021757750U CN 213021084 U CN213021084 U CN 213021084U
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- 239000000498 cooling water Substances 0.000 title claims abstract description 79
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 24
- 239000004814 polyurethane Substances 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 180
- 238000006243 chemical reaction Methods 0.000 claims abstract description 31
- 230000001105 regulatory effect Effects 0.000 claims description 29
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000005485 electric heating Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000007774 longterm Effects 0.000 abstract 1
- 239000008399 tap water Substances 0.000 description 6
- 235000020679 tap water Nutrition 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 238000007710 freezing Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Abstract
The utility model discloses a cooling water temperature control device for polyurethane production, include: the chilled water equipment is connected with a chilled water pump, the chilled water pump is connected with the tube pass water inlet of the heat exchanger through a chilled water tube, and the tube pass water outlet is connected with the chilled water equipment to form a chilled water circulation loop; the constant-temperature water tank is connected with a constant-temperature water pump, the constant-temperature water pump is connected with the shell side of the heat exchanger through a front cooling water pipe and a branch water pipe, and a shell side water outlet of the heat exchanger is connected with the constant-temperature water tank through a cooling water return pipe; the front cooling water pipe is provided with a rear cooling water pipe which is connected with a jacket water inlet of the reaction kettle, and a jacket water outlet is connected with the cooling water return pipe through a cooling water outlet pipe to form a double circulation loop of cooling water. The utility model adopts the chilled water equipment to cool the cooling water in the constant temperature water tank through the heat exchanger; the constant temperature water in the constant temperature water tank cools the reaction kettle, ensures the long-term stability of the temperature in the kettle and is beneficial to controlling the product quality.
Description
Technical Field
The utility model belongs to a concretely relates to cooling water temperature control device for polyurethane production.
Background
In the reaction stage of Polyurethane (PUR) production, because the polycondensation reaction releases a large amount of heat, the temperature in the reaction kettle rises very quickly, and at the moment, cooling water needs to be introduced into a jacket outside the reaction kettle to reduce the temperature so as to ensure that the temperature in the reaction kettle is within the required range.
In the prior art, normal-temperature tap water is usually used as cooling water, but the temperature of the tap water can generate a temperature difference of 20-30 ℃ between summer and winter along with the change of the temperature due to the change of the temperature in one year, so that two phenomena that the temperature of a reaction kettle can not be reduced in summer and is too cold in winter can occur. The reaction temperature can not be reduced, and the polyurethane can be excessively crosslinked to influence the product quality; when the polyurethane is cooled and passes through the head in winter, the viscosity of the product is low and the micromolecules exceed the standard due to insufficient crosslinking degree, so that the technical requirement cannot be met. Therefore, how to provide a controllable cooling system for the reaction kettle, so that the reaction temperature of polyurethane production is not influenced by seasons, the reaction can be repeated in production, and the stability of product performance is maintained, which is an important problem.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a cooling water temperature regulating device for polyurethane production to solve the problem that cooling water temperature can not give reation kettle cooling in the current polyurethane production process in a controllable way.
In order to realize the purpose, the technical scheme of the utility model is that:
a cooling water temperature control device for polyurethane production, characterized by comprising: a chilled water device, a heat exchanger and a constant temperature water tank;
the water outlet of the chilled water equipment is connected with the water inlet of a chilled water pump, the water outlet of the chilled water pump is connected with the tube pass water inlet of the heat exchanger through a chilled water pipe, and a first flow regulating valve is arranged on the chilled water pipe; the tube pass water outlet of the heat exchanger is connected with the chilled water equipment through a chilled water return pipe to form a chilled water circulation loop;
the water outlet of the constant-temperature water tank is connected with the water inlet of a constant-temperature water pump, the water outlet of the constant-temperature water pump is connected with the shell pass water inlet of the heat exchanger through a front cooling water pipe and a branch water pipe, and the shell pass water outlet of the heat exchanger is connected with the constant-temperature water tank through a cooling water return pipe; the front cooling water pipe is also provided with a rear cooling water pipe connected with a jacket water inlet of the reaction kettle, and a jacket water outlet of the reaction kettle is connected with the cooling water return pipe through a cooling water outlet pipe to form a double circulation loop of cooling water.
Compared with the prior art, the utility model, there is following benefit:
the utility model adopts the chilled water equipment to cool the cooling water in the constant temperature water tank through the heat exchanger; the constant temperature water in the constant temperature water tank is used for cooling the reaction kettle, the intelligent PLC control system can be used for adjusting the valve opening degree of the freezing water and the cooling water according to the temperature in the kettle, finally the temperature in the kettle is ensured to be stabilized at 105-110 ℃ for a long time, and the stability coefficient of the product quality is favorably controlled.
Drawings
Fig. 1 is a schematic structural view of the present invention;
in the figure: 1-chilled water equipment, 2-heat exchanger, 3-constant temperature water tank, 4-chilled water pump, 5-constant temperature water pump and 6-reaction kettle; l1-a freezing water pipe, L2-a freezing water return pipe, L3-a front cooling water pipe, L4-a branch water pipe, L5-a rear cooling water pipe, L6-a cooling water return pipe, L7-a cooling water outlet pipe, L8-a return water pipe, L9-an emergency water inlet pipe, L10-an emergency water outlet pipe and L11-a water replenishing pipe; v1-a first flow regulating valve, V2-a second flow regulating valve, V3-a third flow regulating valve, V5-a first water valve, V6-a fourth flow regulating valve, V7-a second water valve and V8-an emptying valve.
Detailed Description
It should be understood by those skilled in the art that the present embodiment is only for illustrating the present invention and is not used as a limitation of the present invention, and that changes and modifications to the embodiment may be made within the scope of the claims of the present invention.
As shown in fig. 1. A cooling water temperature control device for polyurethane production, includes: the system comprises a chilled water device 1, a heat exchanger 2 and a constant-temperature water tank 3;
the water outlet of the chilled water device 1 is connected with the water inlet of a chilled water pump 4, the water outlet of the chilled water pump 4 is connected with the tube pass water inlet of the heat exchanger 2 through a chilled water tube L1, and a first flow regulating valve V1 is arranged on the chilled water tube L1; the tube pass water outlet of the heat exchanger 2 is connected with the chilled water equipment 1 through a chilled water return pipe L2 to form a chilled water circulation loop;
the water outlet of the constant-temperature water tank 3 is connected with the water inlet of a constant-temperature water pump 5, the water outlet of the constant-temperature water pump 5 is connected with the shell pass water inlet of the heat exchanger 2 through a front cooling water pipe L3 and a branch water pipe L4, and the shell pass water outlet of the heat exchanger 2 is connected with the constant-temperature water tank 3 through a cooling water return pipe L6; the front cooling water pipe L3 is also provided with a rear cooling water pipe L5 connected with a jacket water inlet of the reaction kettle 6, and a jacket water outlet of the reaction kettle 6 is connected with the cooling water return pipe L6 through a cooling water outlet pipe L7 to form a double circulation loop of cooling water.
Furthermore, a second flow regulating valve V2 is arranged on the branch water pipe L4, a third flow regulating valve V3 is arranged on the rear cooling water pipe L5, and a check valve V4 is arranged on the cooling water outlet pipe L7.
Furthermore, the first flow regulating valve V1, the second flow regulating valve V2 and the third flow regulating valve V3 are all provided with data transmission lines to be connected with an external PLC controller; a temperature sensor is arranged in the reaction kettle 6, and a data transmission line is arranged in the temperature sensor and is connected with a data acquisition end of an external PLC (programmable logic controller); the PLC controls the valve opening degree of the first flow regulating valve V1, the second flow regulating valve V2 and the third flow regulating valve V3 according to the temperature in the reaction kettle 6 to regulate the water flow and the water temperature entering the jacket of the reaction kettle.
Furthermore, a backflow water pipe L8 is arranged on the rear cooling water pipe L5 and connected with the constant temperature water tank 3, and a first water valve V5 is arranged on the backflow water pipe L8; when the reaction kettle 6 stops working, the cooling water in the jacket of the reaction kettle 6 can flow back to the constant temperature water tank 3.
Furthermore, an emergency water inlet pipe L9 is further arranged on the rear cooling water pipe L5, and a fourth flow regulating valve V6 is arranged on the emergency water inlet pipe; and when the constant-temperature water tank is overhauled or fails, tap water is used as cooling water for emergency in time.
Furthermore, an emergency water outlet pipe L10 is arranged on the cooling water outlet pipe L7, a second water valve V7 is arranged on the emergency water outlet pipe, and when tap water of the emergency water inlet pipe L9 is used as cooling water for emergency, the emergency water outlet pipe L10 is used as a tap water outlet pipe.
Further, a water replenishing pipe L11 is provided at an upper portion of the constant temperature water tank 3 for periodically replenishing the constant temperature water tank 3 with lost water.
Further, the outside of constant temperature water tank 3 wraps up steam heating coil or electric heating belt for when the temperature is not enough winter to the constant temperature water tank 3 heats.
Further, an emptying valve V8 is arranged on the cooling water outlet pipe L7 and is used for discharging excess water or cleaning wastewater in the jacket of the reaction kettle 6.
The utility model discloses a cooling water temperature control device for polyurethane production, theory of operation and operation flow are as follows:
(1) when the water temperature is higher in summer
The chilled water from the chilled water device 1 is pressurized by the chilled water pump 4 and then is sent to the tube pass water inlet of the heat exchanger 2, and the flow of the chilled water is regulated by the first flow regulating valve V1; the refrigerant exchanges heat with cooling water in a shell pass in the heat exchanger 2 and then flows back to the chilled water equipment 1; the temperature of the frozen water is set according to the required temperature;
the cooling water in the constant temperature water tank 3 enters a front cooling water pipe L3 through the constant temperature water pump 5, and then is divided into two paths: the first path enters the shell pass of the heat exchanger 2 from the branch water pipe L4, exchanges heat with chilled water and then returns to the constant temperature water tank 3 from the cooling water return pipe L6; the second path enters the jacket of the reaction kettle 6 from the rear cooling water pipe L5 to serve as cooling water for cooling the reaction kettle 6, then flows into the cooling water return pipe L6 through the cooling water outlet pipe L7, and then flows back to the constant temperature water tank 3 to form a double circulation loop of the cooling water; the temperature and flow rate of the cooling water can be adjusted by adjusting the opening degrees of the second flow regulating valve V2 and the third flow regulating valve V3, so that the temperature control in the reaction kettle is realized.
(2) When the water temperature is lower in winter
In winter, when the water temperature is too low, in order to ensure that the water temperature of the constant temperature water tank 3 is consistent in winter and summer, a steam heating coil or an electric heating belt wrapped outside the constant temperature water tank 3 can be used for heating the constant temperature water tank 3; when steam heating coils are used, the steam comes from a steam generator supplying heat to the PUR; and when the temperature of the constant-temperature water tank 3 rises, the operation is carried out according to the process of high water temperature.
(3) When the reaction kettle 6 stops working and the jacket needs to be drained, the third flow regulating valve V3 and the check water valve V4 are closed, the first water valve V5 is opened, and then the emptying valve V8 is opened; and redundant constant-temperature water in the jacket of the reaction kettle 6 flows back to the constant-temperature water tank 3.
(4) When the chilled water equipment 1, the heat exchanger 2 or the constant-temperature water tank 3 breaks down or cannot be overhauled, other valves are closed, the fourth flow regulating valve V6 and the second water valve V7 are opened, and tap water is used for emergency.
Claims (9)
1. A cooling water temperature control device for polyurethane production, characterized by comprising: the system comprises a chilled water device (1), a heat exchanger (2) and a constant-temperature water tank (3);
the water outlet of the chilled water equipment (1) is connected with the water inlet of a chilled water pump (4), the water outlet of the chilled water pump (4) is connected with the tube pass water inlet of the heat exchanger (2) through a chilled water tube (L1), and a first flow regulating valve (V1) is arranged on the chilled water tube (L1); the tube pass water outlet of the heat exchanger (2) is connected with the chilled water equipment (1) through a chilled water return pipe (L2);
the water outlet of the constant-temperature water tank (3) is connected with the water inlet of a constant-temperature water pump (5), the water outlet of the constant-temperature water pump (5) is connected with the shell pass water inlet of the heat exchanger (2) through a front cooling water pipe (L3) and a branch water pipe (L4), and the shell pass water outlet of the heat exchanger (2) is connected with the constant-temperature water tank (3) through a cooling water return pipe (L6); the front cooling water pipe (L3) is also provided with a rear cooling water pipe (L5) which is connected with a jacket water inlet of the reaction kettle (6), and a jacket water outlet of the reaction kettle (6) is connected with the cooling water return pipe (L6) through a cooling water outlet pipe (L7).
2. The cooling water temperature control device for polyurethane production according to claim 1, wherein a second flow regulating valve (V2) is arranged on the branch water pipe (L4), a third flow regulating valve (V3) is arranged on the rear cooling water pipe (L5), and a check water valve (V4) is arranged on the cooling water outlet pipe (L7).
3. The cooling water temperature control device for polyurethane production as claimed in claim 2, wherein the first flow regulating valve (V1), the second flow regulating valve (V2) and the third flow regulating valve (V3) are all provided with data transmission lines to be connected with an external PLC controller; a temperature sensor is arranged in the reaction kettle (6), and a data transmission line is arranged in the temperature sensor and connected with a data acquisition end of an external PLC.
4. The cooling water temperature control device for polyurethane production as claimed in claim 1, wherein a return water pipe (L8) is provided on the after-cooling water pipe (L5) to connect with the constant temperature water tank (3), and a first water valve (V5) is provided thereon.
5. The cooling water temperature control device for polyurethane production as claimed in claim 1, wherein the post cooling water pipe (L5) is further provided with an emergency water inlet pipe (L9) on which a fourth flow regulating valve (V6) is arranged.
6. The cooling water temperature control device for polyurethane production as claimed in claim 1, wherein the cooling water outlet pipe (L7) is provided with an emergency outlet pipe (L10) on which a second water valve (V7) is arranged.
7. The cooling water temperature control device for polyurethane production as claimed in claim 1, wherein the upper part of the constant temperature water tank (3) is provided with a water supply pipe (L11).
8. The cooling water temperature control device for polyurethane production as claimed in claim 1, wherein the exterior of the constant temperature water tank (3) is wrapped with steam heating coil or electric heating tape.
9. The cooling water temperature control device for polyurethane production as claimed in claim 1, wherein an evacuation valve (V8) is provided on the cooling water outlet pipe (L7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021757750.0U CN213021084U (en) | 2020-08-21 | 2020-08-21 | Cooling water temperature control device for polyurethane production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021757750.0U CN213021084U (en) | 2020-08-21 | 2020-08-21 | Cooling water temperature control device for polyurethane production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213021084U true CN213021084U (en) | 2021-04-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021757750.0U Active CN213021084U (en) | 2020-08-21 | 2020-08-21 | Cooling water temperature control device for polyurethane production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213021084U (en) |
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- 2020-08-21 CN CN202021757750.0U patent/CN213021084U/en active Active
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| GR01 | Patent grant | ||
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Address after: 639 Xiasheng Road, Jinshan District, Shanghai, May 12, 2015 Patentee after: Shanghai Dongrui New Materials Co.,Ltd. Country or region after: China Address before: 639 Xiasheng Road, Jinshan District, Shanghai, May 12, 2015 Patentee before: SHANGHAI DONGRUI CHEMICAL Co.,Ltd. Country or region before: China |