A cold water type high eo content polyether polyol finished product heat exchanger

Abstract

The utility model relates to polyether polyol finished product cooling technical field, concretely is a cold water type high EO content polyether polyol finished product heat exchanger, including the reaction kettle, the output of reaction kettle is equipped with the filter box, the filter box connects the spiral pipe heat exchanger subassembly, one side of spiral pipe heat exchanger subassembly is equipped with the plate heat exchanger subassembly, the output of plate heat exchanger subassembly is equipped with the finished product storage tank, one side of spiral pipe heat exchanger subassembly is equipped with the controller, be equipped with high pressure water pump on the filter box, utilize the structure of spiral pipe heat exchanger subassembly, buffer tank, first circulating pump, plate heat exchanger subassembly, second circulating pump, controller, solved the traditional polyether polyol finished product cooling for single -stage heat exchange mode, difficult to satisfy high EO polyether quick cooling demand, usually need from 80 90 DEG C to drop to 30 35 DEG C, lead to the problem of production cycle extension.

Description

Technical Field

[0001] This utility model relates to the field of cooling technology for polyether polyol products, specifically a cold water type heat exchanger for high EO content polyether polyol products. Background Technology

[0002] Polyether polyols with high ethylene oxide (EO) content are sensitive to temperature. Overheating may cause molecular chain breakage or side reactions, affecting product performance (such as viscosity, hydroxyl value, etc.). Heat exchangers are specifically used in the production process of polyether polyols with high ethylene oxide (EO) content. Their main function is to rapidly cool the synthesized polyether polyol product through a cold water circulation system to ensure that the product temperature is controlled within the range required by the process.

[0003] Traditional cooling of polyether polyol products uses a single-stage heat exchange mode, which is difficult to meet the rapid cooling requirements of high EO polyethers. Typically, the temperature needs to be reduced from 80-90℃ to 30-35℃, resulting in a longer production cycle.

[0004] Therefore, it is particularly important to design a cold-water type high EO content polyether polyol finished heat exchanger to overcome the above-mentioned technical defects and improve the overall practicality. Utility Model Content

[0005] The purpose of this invention is to provide a cold water type high EO content polyether polyol finished heat exchanger to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A cold-water type high EO content polyether polyol finished product heat exchanger includes a reaction vessel, a filter box at the output port of the reaction vessel, a spiral tube heat exchanger assembly connected to the filter box, a plate heat exchanger assembly on one side of the spiral tube heat exchanger assembly, a finished product storage tank at the output end of the plate heat exchanger assembly, a controller on one side of the spiral tube heat exchanger assembly, and a high-pressure water pump on the filter box.

[0008] The spiral tube heat exchanger assembly includes a housing, inside which a spiral tube is provided. One end of the spiral tube is connected to the outlet of a filter box, and the other end of the spiral tube is connected to a plate heat exchanger assembly. A flow channel is provided on the upper part of the housing. One end of the flow channel is connected to a cooler, the cooler is connected to a buffer tank, the buffer tank is connected to a first circulation pump, and the output end of the first circulation pump is connected to the other end of the flow channel.

[0009] As a preferred embodiment of this utility model, the plate heat exchanger assembly includes a corrugated plate group, a hot medium channel, a cold medium channel, a sealing system, and several interfaces. The interior of the cold medium channel is provided with chilled brine, and one end of the cold medium channel is connected to a chilled brine unit. The chilled brine unit is connected to a temporary storage tank. The temporary storage tank is connected to the inlet of a second circulation pump, and the outlet of the second circulation pump is connected to the inlet of the cold medium channel.

[0010] As a preferred embodiment of this utility model, a conveying pipe is provided between the reaction vessel and the filter box, an electromagnetic valve is provided on the outside of the conveying pipe, a temperature sensor is provided on the spiral tube and plate heat exchanger assembly, and a drainage pipe is provided on the filter box.

[0011] As a preferred embodiment of this utility model, the filter box includes a box body, a coarse filter screen, and a fine filter screen. The coarse filter screen is installed at an incline on the inlet side of the filter box, and the fine filter screen is installed horizontally on the outlet side of the filter box. The bottom of the filter box is provided with a backwashing interface, which is connected to a high-pressure water pump through a pipe.

[0012] As a preferred embodiment of this utility model, the flow channel is provided with cooling water inside, and the flow channel is provided with a wave-shaped baffle to guide the cooling water in an S-shaped flow path and extend the heat transfer time.

[0013] As a preferred embodiment of this utility model, the controller integrates a PID control algorithm, and the controller communicates with the first circulation pump and the second circulation pump via the Modbus protocol, and receives feedback signals from the temperature sensor in real time, which is used to dynamically adjust the circulation pump speed and the flow rate of the chilled brine.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model utilizes a cold-water type high EO content polyether polyol finished product heat exchanger, employing a structure consisting of a spiral tube heat exchanger assembly, a shell, a spiral tube, a flow channel, a cooler, a buffer tank, a first circulating pump, a plate heat exchanger assembly, a second circulating pump, and a controller. The polyether inside the reactor enters the filter box via a solenoid valve controlled by the delivery pipe. After impurities are intercepted by a coarse filter, the polyether is finely filtered and enters the spiral tube for counter-current heat exchange with cooling water. The cooling water is circulated by a pump for cooling. The initially cooled polyether enters the plate heat exchanger for secondary heat exchange with chilled brine. The flow rate of the chilled brine is dynamically adjusted. The deeply cooled polyether enters the finished product tank. The backwash port at the bottom of the filter box automatically discharges slag via a high-pressure water pump, extending the maintenance cycle. This solves the problem that the traditional single-stage heat exchange mode for cooling finished polyether polyols is insufficient to meet the rapid cooling requirements of high EO polyethers, which typically require cooling from 80-90℃ to 30-35℃, leading to extended production cycles. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of a portion of the structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the spiral tube heat exchanger assembly of this utility model.

[0019] In the diagram: 1. Reactor; 101. Filter box; 102. Finished product storage tank; 103. High-pressure water pump; 106. Temperature sensor; 2. Spiral heat exchanger assembly; 201. Shell; 202. Spiral tube; 203. Flow channel; 204. Cooler; 205. Buffer tank; 206. First circulation pump; 3. Plate heat exchanger assembly; 305. Second circulation pump; 4. Controller. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0021] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are provided. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0022] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] For examples, please refer to Figure 1-3 This utility model provides a technical solution:

[0025] A cold-water type high EO content polyether polyol finished product heat exchanger includes a reaction vessel 1. A filter box 101 is installed at the outlet of the reaction vessel 1. The filter box 101 is connected to a spiral tube heat exchanger assembly 2. A plate heat exchanger assembly 3 is installed on one side of the spiral tube heat exchanger assembly 2. A finished product storage tank 102 is installed at the outlet of the plate heat exchanger assembly 3. A controller 4 is installed on one side of the spiral tube heat exchanger assembly 2. A high-pressure water pump 103 is installed on the filter box 101. The spiral tube heat exchanger assembly 2 includes a shell 201, and a spiral tube 202 is installed inside the shell 201. One end of the spiral tube 202 is connected to the output port of the filter box 101, and the other end of the spiral tube 202 is connected to the plate heat exchanger assembly 3. A flow channel 203 is provided on the upper part of the shell 201. One end of the flow channel 203 is connected to the cooler 204, which is connected to the buffer tank 205. The buffer tank 205 is connected to the first circulation pump 206, and the output end of the first circulation pump 206 is connected to the other end of the flow channel 203. The high-EO polyether polyol that has undergone polymerization in the reactor 1 enters the filter box 101 through the conveying pipe. The solenoid valve of the conveying pipe opens and closes according to the command of the controller 4 to control the material flow. In the flow-through process, the coarse filter screen at the inlet side of the filter box 101 first intercepts large particles of impurities. Then, due to its inclined installation design, the impurities automatically slide into the drain pipe. The finely filtered polyether enters the spiral tube 202 of the spiral tube heat exchanger assembly 2, where it undergoes counter-current heat exchange with the cooling water in the flow channel 203 of the shell 201. The temperature drops from 80-90℃ to 50-60℃. A temperature sensor on the outer wall of the spiral tube monitors the material temperature in real time, and the data is fed back to the controller 4. The cooling water is pumped from the buffer tank 205 by the first circulation pump 206, cooled by the cooler 204, and then recycled. The primary cooling... The polyether enters the plate heat exchanger assembly 3, where it undergoes secondary heat exchange with the -10℃ CaCl2 solution of chilled brine in the narrow channel formed by the corrugated plate assembly. The temperature is further reduced to 30-35℃. The chilled brine is pumped from the temporary storage tank by the second circulation pump 305, and circulated after being cooled by the chilled brine unit. The flow rate is dynamically adjusted by the controller 4 based on feedback from the outlet temperature sensor 106. After the cooling is completed, the polyether product enters the finished product storage tank 102. The backwashing interface at the bottom of the filter box is automatically backwashed by the high-pressure water pump 103 to remove impurities trapped in the filter screen and extend the maintenance cycle.

[0026] The plate heat exchanger assembly 3 includes a corrugated plate group, a hot medium channel, a cold medium channel, a sealing system, and several interfaces. The cold medium channel contains chilled brine, and one end of the cold medium channel is connected to a chilled brine unit. The chilled brine unit is connected to a temporary storage tank, which is connected to the inlet of a second circulation pump. The outlet of the second circulation pump is connected to the inlet of the cold medium channel. By using a corrugated plate group to form a multi-contact heat transfer surface, heat transfer efficiency is improved. The chilled brine closed-loop system operates independently, and precise flow control is achieved by combining the temporary storage tank and the second circulation pump. A delivery pipe is provided between the reactor 1 and the filter box 101, and a solenoid valve is installed on the outside of the delivery pipe. Temperature sensors are installed on the spiral tube 202 and the plate heat exchanger assembly 3. A drain pipe is provided on the filter box 101, and the drain pipe forms a self-cleaning loop with the high-pressure water pump, extending the maintenance cycle of the filter box. The filter box 101 includes... The filter box 101 consists of a housing, a coarse filter, and a fine filter. The coarse filter is installed at an angle on the inlet side of the filter box 101, while the fine filter is installed horizontally on the outlet side. The bottom of the filter box 101 is equipped with a backwashing port, which is connected to a high-pressure water pump 103 via a pipe. This three-stage filtration system, consisting of coarse filtration, fine filtration, and backwashing, intercepts impurities and ensures the cleanliness of the polyether product. The flow channel 203 contains cooling water and a wave-shaped baffle plate to guide the cooling water in an S-shaped flow path, extending the heat transfer time. The wave-shaped baffle plate causes the cooling water to flow in an S-shaped turbulent flow, extending the heat transfer path. The controller integrates a PID control algorithm and communicates with the first circulation pump 206 and the second circulation pump 305 via the Modbus protocol. It also receives feedback signals from the temperature sensor 106 in real time to dynamically adjust the circulation pump speed and the chilled brine flow rate, facilitating the opening and closing of the components.

[0027] The working process of this utility model is as follows: When using this cold-water type high EO content polyether polyol finished product heat exchanger, the high EO polyether polyol that has completed the polymerization reaction in the reactor 1 first enters the filter box 101 through the conveying pipe. The solenoid valve of the conveying pipe opens and closes according to the command of the controller 4 to control the material flow. The coarse filter screen on the inlet side of the filter box 101 first intercepts large particulate impurities. Then, due to the inclined installation design, the impurities automatically slide to the drain pipe. The finely filtered polyether enters the spiral tube 202 of the spiral tube heat exchanger assembly 2 and undergoes countercurrent heat exchange with the cooling water in the flow channel 203 of the shell 201. The temperature drops from 80-90℃ to 50-60℃. The temperature sensor on the outer wall of the spiral tube monitors the material temperature in real time, and the data is fed back to the control. In device 4, cooling water is pumped from buffer tank 205 by first circulation pump 206, cooled by cooler 204 and then recycled. The polyether after primary cooling enters plate heat exchanger assembly 3, where it undergoes secondary heat exchange with -10℃ CaCl2 solution of chilled brine in the narrow channel formed by corrugated plate assembly, further reducing the temperature to 30-35℃. The chilled brine is pumped from temporary storage tank by second circulation pump 305, cooled by chilled brine unit and then circulated. The flow rate is dynamically adjusted by controller 4 based on feedback from outlet temperature sensor 106. After cooling is completed, the finished polyether product enters finished product storage tank 102. The backwash interface at the bottom of the filter box is automatically backwashed by high-pressure water pump 103 to remove impurities trapped in the filter screen and extend the maintenance cycle.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0029] All standard parts used in this application can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is through a controller. The control circuit of the controller can be realized by a person skilled in the art through simple circuit connection. It is common knowledge in the field. Therefore, this application will not explain the control method and circuit connection in detail.

Claims

1. A cold-water type high EO content polyether polyol finished heat exchanger, comprising a reaction vessel (1), characterized in that: The output port of the reactor (1) is equipped with a filter box (101), the filter box (101) is connected to the spiral tube heat exchanger assembly (2), a plate heat exchanger assembly (3) is provided on one side of the spiral tube heat exchanger assembly (2), a finished product storage tank (102) is provided at the output end of the plate heat exchanger assembly (3), a controller (4) is provided on one side of the spiral tube heat exchanger assembly (2), and a high-pressure water pump (103) is provided on the filter box (101). The spiral heat exchanger assembly (2) includes a housing (201), inside which is a spiral tube (202). One end of the spiral tube (202) is connected to the outlet of the filter box (101), and the other end of the spiral tube (202) is connected to the plate heat exchanger assembly (3). A flow channel (203) is provided on the upper part of the housing (201). One end of the flow channel (203) is connected to a cooler (204), and the cooler (204) is connected to a buffer tank (205). The buffer tank (205) is connected to a first circulation pump (206), and the output end of the first circulation pump (206) is connected to the other end of the flow channel (203).

2. The cold water type high EO content polyether polyol finished heat exchanger according to claim 1, characterized in that: The plate heat exchanger assembly (3) includes a corrugated plate group, a hot medium channel, a cold medium channel, a sealing system, and several interfaces. The interior of the cold medium channel is provided with chilled brine, and one end of the cold medium channel is connected to a chilled brine unit. The chilled brine unit is connected to a temporary storage tank. The temporary storage tank is connected to the inlet of the second circulation pump, and the outlet of the second circulation pump is connected to the inlet of the cold medium channel.

3. A cold water type high EO content polyether polyol finished heat exchanger according to claim 1, characterized in that: A conveying pipe is provided between the reactor (1) and the filter box (101). An electromagnetic valve is provided on the outside of the conveying pipe. Temperature sensors are provided on the spiral tube (202) and the plate heat exchanger assembly (3). A drain pipe is provided on the filter box (101).

4. A cold water type high EO content polyether polyol finished heat exchanger according to claim 1, characterized in that: The filter box (101) includes a box body, a coarse filter screen, and a fine filter screen. The coarse filter screen is installed at an angle on the inlet side of the filter box (101), and the fine filter screen is installed horizontally on the outlet side of the filter box (101). The bottom of the filter box (101) is provided with a backwashing interface, which is connected to a high-pressure water pump (103) through a pipe.

5. A cold water type high EO content polyether polyol finished heat exchanger according to claim 1, characterized in that: The flow channel (203) is equipped with cooling water, and the flow channel (203) is equipped with a wave-shaped baffle to guide the cooling water in an S-shaped flow path and extend the heat transfer time.

6. A cold-water type high EO content polyether polyol heat exchanger according to any one of claims 2 or 3, characterized in that: The controller (4) integrates a PID control algorithm, and the controller (4) communicates with the first circulating pump (206) and the second circulating pump (305) via the Modbus protocol, and receives feedback signals from the temperature sensor (106) in real time, which is used to dynamically adjust the speed of the circulating pump and the flow rate of the chilled brine.

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