A heat exchanger system for intelligently controlling the temperature of water for injection

Abstract

The present invention provides an intelligently controlled heat exchanger system, wherein an inlet valve is provided on the bypass pipe between the heat exchanger and the main pipe, for controlling the opening and closing of the heat exchanger inlet pipe and the size of the fluid flow; an outlet valve is provided on the bypass pipe between the outlet pipe and the main pipe, for opening and closing the bypass pipe; the system further comprises a controller, which is informationally connected with the temperature sensor, the outlet valve, the main valve, the inlet valve and the outlet valve. The present invention can make the outlet fluid within a certain range to avoid the temperature not meeting the requirements by providing an intelligently controlled heat exchanger system, and when the temperature does not meet the requirements, the internal circulation of the fluid is maintained until the temperature meets the requirements, thereby achieving the effect of saving energy.

Description

Technical Field

[0001] The invention relates to a shell and tube heat exchanger, and in particular to an intelligently controlled heat exchanger system. Background Art

[0002] Shell and tube heat exchanger is also called shell and tube heat exchanger. It is a wall heat exchanger that uses the wall of the tube bundle enclosed in the shell as the heat transfer surface. This type of heat exchanger has a simple structure and reliable operation. It can be made of various structural materials (mainly metal materials) and can be used under high temperature and high pressure. It is currently the most widely used type.

[0003] Shell and tube heat exchangers are widely used in industries such as chemical, petroleum, refrigeration, nuclear energy and power. Due to the global energy crisis, in order to reduce energy consumption, the demand for heat exchangers in industrial production is increasing, and the quality requirements for heat exchangers are also getting higher and higher. In recent decades, although compact heat exchangers (plate, plate-fin, press-welded plate heat exchangers, etc.), heat pipe heat exchangers, direct contact heat exchangers, etc. have developed rapidly, shell and tube heat exchangers still dominate production and usage due to their high reliability and wide adaptability. According to relevant statistics, the use of shell and tube heat exchangers in industrial devices still accounts for about 70% of all heat exchangers.

[0004] At present, the heat exchanger system consists of three parts: storage system, distribution system and user part. Water enters the storage system, is transported to the user through the distribution system, and then circulates back to the storage system. Water is taken in the workshop by opening the point valve. Among them, the water used usually needs to meet the needs of customers, and it is generally not too high or too low. However, the current temperature control system in the industry has at least the problem of high construction and operation costs and poor water temperature control effect. Summary of the invention

[0005] In order to overcome the defects and shortcomings in the prior art, the present invention provides a novel intelligently controlled heat exchanger system, which can improve the intelligence of the heat exchanger system, realize intelligent control of water temperature, and achieve the effect of saving energy.

[0006] In order to achieve the above object, the technical solution of the present invention is as follows:

[0007] A heat exchanger system with intelligent control, the system comprising a main pipeline and a bypass pipeline connected in parallel with the main pipeline, a heat exchanger is arranged on the bypass pipeline, an outlet pipeline is arranged on the bypass pipeline downstream of the heat exchanger, and an outlet valve is arranged on the outlet pipeline for controlling the opening and closing of the outlet pipeline; a temperature sensor is arranged on the bypass pipeline between the heat exchanger and the outlet pipeline for detecting the temperature of the fluid after heat exchange by the heat exchanger; a main valve is arranged on the main pipeline for controlling the opening and closing of the main pipeline; an inlet valve is arranged on the bypass pipeline between the heat exchanger and the main pipeline for controlling the opening and closing of the inlet pipeline of the heat exchanger and the size of the fluid flow; an outlet valve is arranged on the bypass pipeline between the outlet pipeline and the main pipeline for opening and closing of the bypass pipeline; the system also comprises a controller, and the controller is informationally connected with the temperature sensor, the outlet valve, the main valve, the inlet valve and the outlet valve.

[0008] As an improvement, when the heat exchanger is not required to work, the main valve is opened, the inlet valve and / or the outlet valve is closed, and the fluid flows in the main flow channel.

[0009] As an improvement, when the heat exchanger needs to work, the main valve is closed, and the inlet valve and the outlet valve are opened; the temperature detected by the temperature sensor is transmitted to the controller, and the controller automatically controls the opening and closing of the outlet valve according to the temperature detected by the temperature sensor.

[0010] As an improvement, when the temperature detected by the temperature sensor is lower than the lower limit data or higher than the upper limit data, the outlet valve is closed. At this time, the fluid continues to flow in the bypass pipe and is then introduced into the main pipe to continue circulating between the bypass pipe and the main pipe.

[0011] As an improvement, when the temperature detected by the temperature sensor is between the upper limit temperature and the lower limit temperature, the outlet valve is opened and the outlet valve is closed.

[0012] As an improvement, the system is provided with an alarm, and the controller sends out a low temperature or high temperature alarm signal according to the temperature monitored by the temperature sensor.

[0013] As an improvement, the shell inlet and outlet of the heat exchanger are respectively connected to the cold source inlet pipe and the cold source outlet pipe, and the cold edge outlet pipe is provided with a cold source flow regulating valve. The fluid in the pipe side is the heat source, that is, the fluid flowing in the bypass pipe is the heat source of the heat exchanger; when the heat exchanger starts working, the temperature detected by the temperature sensor automatically controls the valve opening of the regulating valve, thereby controlling the flow of the cold source and further controlling the outlet temperature of the heat source of the heat exchanger.

[0014] As an improvement, when the monitored temperature is too high, the controller controls the opening of the regulating valve to increase, and when the detected temperature is too low, the controller controls the opening of the regulating valve to decrease.

[0015] As an improvement, the heat source is water for injection, and the cold source is cold water.

[0016] As an improvement, the upper limit temperature is 85°C, preferably 80°C; the lower limit temperature is 70°C.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The present invention sets up an intelligently controlled heat exchanger system, which can make the drawn fluid within a certain range to avoid the temperature not meeting the requirements. When the temperature does not meet the requirements, the internal circulation of the fluid is maintained until the temperature meets the requirements, thereby achieving the effect of energy saving;

[0019] 2. The present invention can lead out water that does not meet the requirements through a lead-out pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the intelligent control heat exchanger system of the present invention. DETAILED DESCRIPTION

[0021] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings.

[0022] In this article, unless otherwise specified, “ / ” represents division, and “×” and “*” represent multiplication.

[0023] Figure 1 An intelligent control heat exchanger system is disclosed. Figure 1 As shown, the system includes a main pipeline 1, a bypass pipeline 2 connected in parallel with the main pipeline 1, a heat exchanger 3 is arranged on the bypass pipeline 2, an outlet pipeline 5 is arranged downstream of the heat exchanger 3, and an outlet valve 6 is arranged on the outlet pipeline 5 to control the opening and closing of the outlet pipeline 5; a temperature sensor 13 is arranged on the bypass pipeline between the heat exchanger 3 and the outlet pipeline 5 to detect the temperature of the fluid after heat exchange in the heat exchanger. A main valve 9 is arranged on the main pipeline 1 to control the opening and closing of the main pipeline 1. An inlet valve 7 is arranged on the bypass pipeline 2 between the heat exchanger 3 and the main pipeline 1 to control the opening and closing of the inlet pipeline of the heat exchanger and / or the size of the fluid flow. An outlet valve 8 is arranged on the bypass pipeline between the outlet pipeline 5 and the main pipeline 1 to open and close the bypass pipeline.

[0024] The system further comprises a controller 10 , which is informationally connected with the temperature sensor 13 , the outlet valve 6 , the main valve 10 , the valve 7 and the outlet valve 8 .

[0025] When the heat exchanger is not working, the main valve 9 is opened, the inlet valve 7 and / or the outlet valve 8 is closed, and the fluid flows in the main channel to circulate.

[0026] When the heat exchanger needs to work, the main valve 9 is closed, and the inlet valve 7 and the outlet valve 8 are opened. The temperature detected by the temperature sensor is transmitted to the controller, and the controller automatically controls the opening and closing of the outlet valve 5 according to the temperature detected by the temperature sensor.

[0027] When the temperature detected by the temperature sensor is lower than the lower limit data or higher than the upper limit data, the outlet valve 5 is closed. By closing the outlet valve, the fluid that does not meet the requirements is prevented from being drawn out. At this time, the fluid continues to flow in the bypass pipe 2, and then is introduced into the main pipe 1, and continues to circulate between the bypass pipe 2 and the main pipe 1 to continuously increase or decrease the temperature.

[0028] When the temperature detected by the temperature sensor is between the upper temperature limit and the lower temperature limit, the outlet valve 5 is opened and the outlet valve 8 is closed, so as to ensure that the temperature of the fluid discharged meets the requirements.

[0029] Through the above intelligent control, the fluid can be drawn out within a certain range to avoid the temperature not meeting the requirements. When the temperature does not meet the requirements, the internal circulation of the fluid is maintained until the temperature meets the requirements.

[0030] The present invention can lead out water that does not meet the requirements through the lead-out pipe. For example, by opening the lead-out valve 6 and the inlet valve 7, the water on the heat exchanger and the bypass pipe where it is located can be led out. For example, by opening the valve 8 and the lead-out valve 6, the water on the bypass pipe on the other side can be led out. Leading out the stale water that does not meet the requirements can ensure the hygiene of the water.

[0031] Preferably, the system is provided with an alarm, and the controller sends out a low temperature or high temperature alarm signal according to the temperature monitored by the temperature sensor. Through the alarm, the operator can take relevant process control measures.

[0032] The shell inlet and outlet of the heat exchanger 3 are respectively connected to the cold source inlet pipe 4 and the cold source outlet pipe 11, and the cold water outlet pipe 11 is provided with a cold source flow regulating valve 12. The fluid in the pipe is the heat source, that is, the fluid flowing in the bypass pipe 2 is the heat source of the heat exchanger. When the heat exchanger 3 starts working, the temperature detected by the temperature sensor automatically controls the valve opening of the regulating valve 12, thereby controlling the flow of the cold source and further controlling the outlet temperature of the heat source of the heat exchanger.

[0033] When the monitored temperature is too high, the controller controls the opening of the regulating valve 12 to increase, and when the detected temperature is too low, the controller controls the opening of the regulating valve 12 to decrease, thereby automatically controlling the outlet temperature to achieve the need of energy saving.

[0034] When the heat exchanger is not working, the valve 12 is closed. When the heat exchanger starts working, the valve 12 is opened.

[0035] As an improvement, the heat source is water for injection, and the cold source is cold water.

[0036] As an improvement, the upper limit temperature is 85°C, preferably 80°C. The lower limit temperature is 70°C.

[0037] like Figure 1 As shown, the shell and tube heat exchanger is arranged horizontally, and a plurality of baffles are arranged inside the shell and tube. As an improvement, the baffles are arched baffles.

[0038] As an improvement, the shell side and the tube side flow in countercurrent, and along the flow direction of the fluid in the tube side, the spacing of the baffle group increases continuously from the tube side inlet to the middle of the tube side. Then from the middle of the tube side to the tube side outlet, the spacing of the baffle group decreases continuously. Because in the countercurrent process, the heat exchange of the shell side and the tube side per unit length along the flow process of the fluid is relatively uniform, so that the overall heat exchange effect is the best. However, it was found in experiments and simulations that the heat exchange in the middle is significantly greater than the heat exchange at the tube side inlet and outlet. Therefore, by changing the spacing between the baffles, the heat exchange area between the tube side fluid and the shell side fluid in the baffle also changes. Therefore, the uneven heat exchange is compensated by the change in area, thereby further improving the heat exchange efficiency.

[0039] As an improvement, along the flow direction of the fluid in the tube, from the tube entrance to the middle of the tube, the distance between the baffles increases. Then, from the middle of the tube to the tube exit, the distance between the baffles decreases. The above changes in the range can make the heat transfer per unit length of the entire fluid movement more uniform, further improving the heat transfer efficiency.

[0040] The baffle is an arched baffle, which is arranged in the vertical direction, including an arched baffle located at the upper part and an arched baffle located at the lower part, and the upper arched baffle and the lower arched baffle are arranged at intervals; along the flow direction of the cold water in the shell side, the vertical height of the lower arched baffle extending upward from the bottom shell side inner wall gradually increases, and the vertical length of the upper arched baffle extending downward from the upper shell side inner wall gradually decreases.

[0041] During the research process, it was found that the heat exchange of the baffles of the traditional heat exchanger was uneven in the cross section in the direction of cold water flow. As the distance from the inlet increased, the density of the heat exchange cold water in the lower part of the shell was large, so the cold water body flowed downward, which significantly increased the heat exchange cold water in the lower part. Therefore, it was necessary to design the heat exchange structure for improvement. In the present invention, the height of the upper and lower arched baffles changes along the flow direction of the fluid, so that the liquid in the shell gradually moves closer to the center as it flows, so that the heat exchange tubes around the shell and tube center strengthen the heat exchange, which changes the previous heat exchange method, enhances the heat exchange efficiency at different positions, makes the heat exchange uniform as a whole, and further achieves the purpose of enhanced heat transfer.

[0042] As an improvement, along the flow direction of the cold water in the shell side, the vertical direction of the lower arcuate baffle extending upward from the bottom shell side inner wall gradually increases, and the vertical direction of the upper arcuate baffle extending downward from the upper shell side inner wall gradually decreases. Through the above-mentioned amplitude changes, the overall heat exchange can be further uniform, and the purpose of strengthening heat transfer can be further achieved.

[0043] Although the present invention has been disclosed as above with preferred embodiments, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, so the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A heat exchanger system for intelligently controlling the temperature of water for injection, the system comprising a main pipeline and a bypass pipeline connected in parallel with the main pipeline, a heat exchanger is arranged on the bypass pipeline, an outlet pipeline is arranged on the bypass pipeline downstream of the heat exchanger, and an outlet valve is arranged on the outlet pipeline for controlling the opening and closing of the outlet pipeline; a temperature sensor is arranged on the bypass pipeline between the heat exchanger and the outlet pipeline for detecting the temperature of the fluid after heat exchange by the heat exchanger; a main valve is arranged on the main pipeline for controlling the opening and closing of the main pipeline; an inlet valve is arranged on the bypass pipeline between the heat exchanger and the main pipeline for controlling the opening and closing of the inlet pipeline of the heat exchanger and the size of the fluid flow; an outlet valve is arranged on the bypass pipeline between the outlet pipeline and the main pipeline for opening and closing of the bypass pipeline; the system further comprises a controller, and the controller is informationally connected with the temperature sensor, the outlet valve, the main valve, the inlet valve and the outlet valve; When the heat exchanger is not needed to work, the main valve is opened, the inlet valve and / or the outlet valve are closed, and the fluid flows in the main channel; when the heat exchanger is needed to work, the main valve is closed, and the inlet valve and the outlet valve are opened; the temperature detected by the temperature sensor is transmitted to the controller, and the controller automatically controls the opening and closing of the outlet valve according to the temperature detected by the temperature sensor; the shell inlet and outlet of the heat exchanger are respectively connected to the cold source inlet pipe and the cold source outlet pipe, and the cold source outlet pipe is provided with a cold source flow regulating valve. The fluid in the pipe is the heat source, that is, the fluid flowing in the bypass pipe is the heat source of the heat exchanger; when the heat exchanger starts to work, the valve opening of the regulating valve is automatically controlled by the temperature detected by the temperature sensor, thereby controlling the flow of the cold source and further controlling the outlet temperature of the heat source of the heat exchanger; when the temperature detected by the temperature sensor is lower than the lower limit data or the high limit data When the flow rate reaches the upper limit data, the outlet valve is closed, and the fluid continues to flow in the bypass pipe, and then is introduced into the main pipe, and continues to circulate between the bypass pipe and the main pipe; the heat source is water for injection, and the cold source is cold water; the heat exchanger is a shell and tube heat exchanger, which is arranged horizontally, and a plurality of baffles are arranged in the shell and tube, and the baffles are arched baffles; the shell side and the tube side are countercurrent flows, and along the flow direction of the fluid in the tube side, from the tube side inlet to the middle position of the tube side, the spacing of the baffles increases continuously; then from the middle position of the tube side to the tube side outlet, the spacing of the baffles decreases continuously; along the flow direction of the fluid in the tube side, from the tube side inlet to the middle position of the tube side, the spacing of the baffles increases continuously; then from the middle position of the tube side to the tube side outlet, the spacing of the baffles decreases continuously.

2. The heat exchanger system according to claim 1, characterized in that When the temperature detected by the temperature sensor is between the upper limit temperature and the lower limit temperature, the outlet valve opens and the outlet valve closes.

3. The heat exchanger system according to claim 1, characterized in that The system is provided with an alarm, and the controller sends out a low temperature or high temperature alarm signal according to the temperature monitored by the temperature sensor.

4. The heat exchanger system according to claim 1, characterized in that When the monitored temperature is too high, the controller controls the opening of the regulating valve to increase, and when the detected temperature is too low, the controller controls the opening of the regulating valve to decrease.

5. The heat exchanger system according to claim 1, characterized in that The upper limit temperature is 85°C; the lower limit temperature is 70°C.

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