Sectional type heat exchange system

Abstract

The utility model relates to a heat exchange system which comprises a high-position buffer tank, a heater, a heat exchanger and a low-position buffer tank. According to the heat exchange system, through proportional distribution and mixing of the high-temperature media of the main path and the branch paths and the low-temperature backflow media of the branches, closed-loop temperature control is formed, stepped temperature distribution of the multiple sections of heat exchange areas in the heat exchanger is achieved, the requirements of materials in different heat exchange stages are met, and the heat exchange efficiency is improved. And heat exchange media such as heat conduction oil are recycled among the heater, the heat exchanger, the high-position buffer tank and the low-position buffer tank, energy consumption of the heater is reduced, and meanwhile overheating waste is avoided by adjusting the mixing proportion. The heat exchange system can effectively prevent equipment from being overheated, and accurate control over the temperature is achieved.

Description

Technical Field

[0001] The utility model relates to the field of heat exchange, in particular to a heat exchange system. Background Art

[0002] In industrial heat exchange systems, steam heating has long been used as the main heat source, achieving efficient heat transfer through condensation heat release, and is widely used in chemical, energy, food processing and other fields. Traditional steam heating systems usually include steam generators, steam transmission pipelines, heat exchangers such as shell and tube or fin heat exchangers, and condensate recovery devices. After releasing latent heat in the heat exchanger, steam condenses into water, and the material is heated to the target temperature to meet process requirements. However, traditional steam heating relies on the release of latent heat by steam condensation for heat transfer. The phase change process leads to inaccurate temperature control and the risk of local overheating of the equipment. In particular, for high-viscosity materials, it is easy to cause scaling of the heat transfer surface and frequent local overheating of the equipment, requiring frequent shutdowns for cleaning, affecting continuous production. Utility Model Content

[0003] Therefore, based on the fact that traditional steam heating cannot guarantee uniform and controllable heat transfer in heat exchange systems, especially on special equipment, the utility model aims to provide a new type of heat exchange system, which can use thermal oil as a heating medium, and utilize the stability of the hot oil temperature and the corresponding feedback control system to effectively prevent equipment overheating and achieve precise temperature control.

[0004] The heat exchange system of the utility model comprises:

[0005] a high-level buffer tank connected to the heat exchange system;

[0006] A heater, the inlet of which is connected to the outlet of the high-level buffer tank, and the outlet of which is connected to two pipes, namely a main pipe and a branch pipe;

[0007] The heat exchanger is divided into an upper heat exchange zone and a lower heat exchange zone, which respectively include an upper medium inlet, an upper medium outlet and a lower medium inlet, a lower medium outlet.

[0008] The upper medium inlet is directly connected to the outlet of the heater through the main pipeline. The upper medium outlet pipeline is divided into two branches, namely a first branch and a second branch. The first branch is refluxed and connected to the inlet of the heater. The first branch merges with the lower medium outlet pipeline and the branch pipeline to form a third branch. The third branch is connected to the heater inlet and the lower medium inlet. The second branch merges with the main pipeline connected to the outlet of the heater and is connected to the upper medium inlet.

[0009] A low-level buffer tank connected to the third branch,

[0010] The high-level buffer tank is located higher than the heater and the heat exchanger, and the low-level buffer tank is located lower than the heater and the heat exchanger.

[0011] Preferably, a first regulating valve is provided on the branch pipe connected to the heater outlet.

[0012] Preferably, a second regulating valve is provided on the second branch before merging with the main pipeline connected to the outlet of the heater.

[0013] Preferably, a first temperature sensor is provided at the lower medium inlet, and a second temperature sensor is provided at the upper medium inlet.

[0014] Preferably, the first temperature sensor is in communication connection with the first regulating valve, and the second temperature sensor is in communication connection with the second regulating valve.

[0015] Preferably, a third temperature sensor is provided at the outlet of the heater and is in communication with the power control component of the heater.

[0016] Preferably, the heater is an electric heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic flow diagram of an embodiment of a heat exchange system according to the present invention. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein.

[0019] The heat exchange system of the present invention comprises a high-level buffer tank 1, a heater 2, a heat exchanger 3 and a low-level buffer tank 4. In a preferred embodiment, the heat exchange system is a segmented heat exchange system, such as a two-stage or multi-stage heat exchange system.

[0020] High-level buffer tank 1 is used to store heat exchange medium and maintain system pressure stability. Located at the top of the system, it is designed to be installed above heater 2 and heat exchanger 3, using gravity to supply heat exchange medium to heater 2 below. In a preferred embodiment, the heat exchange medium is thermal oil. The bottom outlet of high-level buffer tank 1 is connected to the inlet of heater 2.

[0021] Heater 2, preferably an electric heater, is used to heat a heat exchange medium, such as thermal oil, to the target temperature, providing a heat source. Its inlet is connected to the outlet of the high-level buffer tank 1, and its outlet is connected to two pipelines: a main pipeline 5 and a branch pipeline 6. The thermal oil flows from the bottom outlet of the high-level buffer tank and enters the heater to be heated to the target temperature. The heated, high-temperature thermal oil is split into two paths: one path flows through the main pipeline 5 at the heater outlet and enters the heat exchanger 3; the other path flows back through the branch pipeline 6 at the heater outlet to the inlet of heater 2.

[0022] The heat exchanger 3 preferably adopts a two-stage or multi-stage heat exchange design, and is provided with two or more medium inlets and medium outlets to form a stepped temperature gradient as needed, achieve more precise temperature control, and optimize heat transfer efficiency. The heat exchanger is preferably an evaporator such as a jacketed evaporator, or a heater. In a preferred embodiment, its interior is divided into an upper heat exchange zone and a lower heat exchange zone, respectively including an upper medium inlet, an upper medium outlet and a lower medium inlet, and a lower medium outlet. The upper medium inlet is directly connected to the outlet of the heater 2 through the main pipeline 5, and the upper medium outlet pipeline is divided into two, namely a first branch 7 and a second branch 8, wherein the first branch 7 is refluxed and connected to the inlet of the heater 2, during which the first branch merges with the lower medium outlet pipeline 9 and the branch pipeline 6 to form a third branch 10, which is connected to the inlet and the lower medium inlet of the heater 2; the second branch 8 is connected to the main pipeline 6 connected to the outlet of the heater 2 and is connected to the upper medium inlet.

[0023] In a preferred embodiment, a first regulating valve 11 is provided on the branch pipe 6 connected to the outlet of the heater 2. This first regulating valve can control the mixing ratio of the high-temperature heat transfer oil in the branch pipe flowing out of the heater outlet and the low-temperature return oil flowing out of the upper and lower medium outlets of the heat exchanger, thereby precisely controlling the temperature of the heat transfer oil entering the lower medium inlet of the lower heat exchange zone.

[0024] In another preferred embodiment, a second regulating valve 12 is provided on the second branch line 8 before it merges with the main line pipeline 5 connected to the outlet of the heater 2. This second regulating valve can control the mixing ratio of the high-temperature heat transfer oil in the main line flowing out of the heater outlet and the low-temperature return oil in the second branch line flowing out of the upper medium outlet, thereby controlling the temperature of the heat transfer oil entering the upper medium inlet.

[0025] In another preferred embodiment, a first temperature sensor 11' is installed at the lower medium inlet, and a second temperature sensor 12' is installed at the upper medium inlet to monitor the temperature of the heat exchange medium entering the upper and lower medium inlets. The first temperature sensor 11' is communicatively connected to the first regulating valve 11, and the second temperature sensor 12' is communicatively connected to the second regulating valve 12. Through this communication connection, the control signals of the first and second regulating valves can be dynamically adjusted based on feedback from the heat exchange medium temperature at the heat exchanger medium inlet. Therefore, the mixing ratio of high-temperature heat transfer oil and low-temperature return oil in the second and third branches can be dynamically adjusted through this feedback control system.

[0026] In another preferred embodiment, a third temperature sensor (not shown) is provided at the outlet of the heater 2 and is in communication with a power control component of the heater.

[0027] The low-level buffer tank 4 is located at the bottom of the system, and its installation position is lower than the heater 2 and the heat exchanger 3. The low-level buffer tank 4 is connected to the third branch 10 and is used to receive the low-temperature reflux medium from the heat exchanger, buffer the system pressure fluctuations, and provide stable feed for the system.

[0028] Therefore, in the heat exchange system of the present invention, the heat exchange medium, such as heat transfer oil, is divided into two paths after being heated by the heater. The high-temperature heat transfer oil in the main pipeline enters the upper medium inlet of the heat exchanger, and the high-temperature heat transfer oil in the branch pipeline is mixed with the low-temperature reflux oil of the first branch flowing out of the upper medium outlet after heat exchange and the low-temperature reflux oil flowing out of the lower medium outlet at the junction of the branch pipeline in proportion as needed, and then passes through the third branch. One part returns to the heater for circulation heating, and the other part enters the lower medium inlet of the heat exchanger, thereby forming a closed-loop temperature control system to achieve step-by-step heat transfer.

[0029] The heat exchange system of the present invention forms a closed-loop temperature control by proportionally distributing and mixing the high-temperature medium of the main circuit and the branch circuit and the low-temperature reflux medium of each branch circuit, thereby realizing a stepped temperature distribution in multiple heat exchange zones in the heat exchanger, adapting to the requirements of different heat exchange stages of the material, and reducing the energy consumption of the heater by recycling the heat exchange medium such as thermal oil between the heater, the heat exchanger and the high-level buffer tank and the low-level buffer tank, while avoiding overheating waste by adjusting the mixing ratio.

[0030] The above describes in detail the preferred embodiment based on the internal division of the heat exchanger into an upper heat exchange zone and a lower heat exchange zone. However, the present invention is not limited to this two-stage heat exchange design. For those skilled in the art, the heat exchange system can be modified or transformed into a multi-stage heat exchange design according to actual industrial needs. These corresponding modifications and deformations are all within the scope of protection of the present invention.

Claims

1. A segmented heat exchange system comprising: a high-level buffer tank connected to the heat exchange system; A heater, the inlet of which is connected to the outlet of the high-level buffer tank, and the outlet of which is connected to two pipes, namely a main pipe and a branch pipe; The heat exchanger is divided into an upper heat exchange zone and a lower heat exchange zone, which respectively include an upper medium inlet, an upper medium outlet and a lower medium inlet, a lower medium outlet. The upper medium inlet is directly connected to the outlet of the heater through the main pipeline. The upper medium outlet pipeline is divided into two branches, namely a first branch and a second branch. The first branch is refluxed and connected to the inlet of the heater. The first branch merges with the lower medium outlet pipeline and the branch pipeline to form a third branch. The third branch is connected to the heater inlet and the lower medium inlet. The second branch merges with the main pipeline connected to the outlet of the heater and is connected to the upper medium inlet. A low-level buffer tank connected to the third branch, The high-level buffer tank is located higher than the heater and the heat exchanger, and the low-level buffer tank is located lower than the heater and the heat exchanger.

2. The segmented heat exchange system according to claim 1, wherein: The heat exchanger is an evaporator or a heater.

3. The segmented heat exchange system according to claim 1, wherein: A first regulating valve is provided on the branch pipeline connected to the heater outlet.

4. The segmented heat exchange system according to claim 1, wherein: A second regulating valve is provided on the second branch before merging with the main pipeline connected to the outlet of the heater.

5. The segmented heat exchange system according to claim 1, wherein: A first temperature sensor is provided at the lower medium inlet, and a second temperature sensor is provided at the upper medium inlet.

6. The segmented heat exchange system according to claim 5, characterized in that: The first temperature sensor is communicatively connected to a first regulating valve provided on a branch pipe connected to the heater outlet, and the second temperature sensor is communicatively connected to a second regulating valve provided on the second branch before merging with a main pipe connected to the heater outlet.

7. The segmented heat exchange system according to claim 1, wherein: A third temperature sensor is provided at the outlet of the heater and is in communication with the power control component of the heater.

8. The segmented heat exchange system according to claim 1, wherein: The heater is an electric heater.

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