Dual-module energy-saving heat exchange unit

Abstract

The utility model discloses a kind of double-module energy-saving heat exchange units, including the main heat exchanger and auxiliary heat exchanger of shunt arrangement, the heating end of main heat exchanger and auxiliary heat exchanger is connected with heat supply pipeline respectively, the water inlet pipe of main heat exchanger and auxiliary heat exchanger is connected with water inlet main pipe, the water outlet pipe of main heat exchanger and auxiliary heat exchanger is connected with water outlet main pipe;The water inlet pipe and water outlet pipe of main heat exchanger are respectively provided with main circulating pump and main temperature control valve, and the water inlet pipe and water outlet pipe of auxiliary heat exchanger are respectively provided with auxiliary circulating pump and auxiliary temperature control valve;Water circulation mechanism for carrying out heat exchange is connected on the water inlet main pipe, and heat recovery mechanism is connected on the water outlet main pipe;The heat exchange unit further includes control box, and PLC controller is arranged in control box.The utility model uses main, auxiliary double-module shunt arrangement design, avoids the energy waste of single-module unit at low load, simultaneously ensures the heat exchange capacity at high load, significantly reduces unit energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange equipment technology, and more specifically to a dual-module energy-saving heat exchange unit. Background Technology

[0002] Heat exchanger units are commonly used equipment in industrial production, building heating, and domestic hot water supply. Their main function is to transfer heat between two or more fluids to meet temperature requirements in production or daily life. Currently, most heat exchanger units on the market adopt a single-module structure, meaning that the heat exchange process is completed through a single heat exchanger. However, this type of single-module heat exchanger unit has significant drawbacks in actual operation: when the heat exchange load is low, full-load operation of a single module will result in energy waste and increased energy consumption; when the heat exchange load is high, the heat exchange capacity of a single module is insufficient, easily leading to decreased heat exchange efficiency and unstable outlet fluid temperature, failing to meet the usage requirements under high-load conditions.

[0003] Furthermore, most existing heat exchange units lack effective heat recovery mechanisms. During the heat exchange process, the discharged water often contains a large amount of waste heat. Directly discharging this waste heat results in serious energy waste, which is inconsistent with current energy conservation and emission reduction requirements. Simultaneously, the control methods of existing units are relatively simple, mostly relying on manual adjustment, and cannot automatically adjust the operating status according to actual load changes, further reducing the unit's operating efficiency and energy-saving effect. Therefore, developing an energy-saving heat exchange unit that can adapt to different load conditions, has heat recovery capabilities, and is intelligently controllable has become an urgent problem to be solved in the field of heat exchange equipment. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a dual-module energy-saving heat exchange unit to solve the problems of high energy consumption, unstable heat exchange efficiency and waste heat of existing heat exchange units under different load conditions.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows.

[0006] A dual-module energy-saving heat exchanger unit includes a main heat exchanger and an auxiliary heat exchanger arranged in parallel. The heating ends of the main heat exchanger and the auxiliary heat exchanger are respectively connected to a heating pipeline. The inlet pipes of the main heat exchanger and the auxiliary heat exchanger are connected to a main inlet pipe, and the outlet pipes of the main heat exchanger and the auxiliary heat exchanger are connected to a main outlet pipe. A main circulation pump and a main temperature control valve are respectively installed on the inlet pipe and the outlet pipe of the main heat exchanger, and an auxiliary circulation pump and an auxiliary temperature control valve are respectively installed on the inlet pipe and the outlet pipe of the auxiliary heat exchanger. A water circulation mechanism for heat exchange is connected to the main inlet pipe, and a heat recovery mechanism for recovering and reusing waste heat in high-temperature drainage is connected to the main outlet pipe. The heat exchanger unit also includes a control box for controlling the operation of the heat exchanger unit. The control box is equipped with a PLC controller, and the output terminal of the PLC controller is respectively connected to the input terminals of the main circulation pump, the auxiliary circulation pump, the main temperature control valve, and the auxiliary temperature control valve.

[0007] To further optimize the technical solution, the water circulation mechanism includes a water storage tank connected to the main water inlet pipe via a water supply pipeline, and a water supply pump installed on the water supply pipeline for pumping water from the water storage tank into the main water inlet pipe. The input end of the water supply pump is connected to the input end of the PLC controller.

[0008] To further optimize the technical solution, a filter is installed on the water supply pipeline between the water supply pump and the main water inlet pipe to filter the water pumped into the storage tank.

[0009] To further optimize the technical solution, the heat recovery mechanism includes a waste heat exchanger whose inlet end is connected to the outlet main pipe via a pipe, the outlet end of the waste heat exchanger is connected to a water storage tank via a pipe, the heat exchange end of the waste heat exchanger is connected to an insulated water tank via a pipe, a circulating water pump is installed on the pipe between the insulated water tank and the waste heat exchanger, and the input end of the circulating water pump is connected to the output end of the PLC controller.

[0010] To further optimize the technical solution, temperature sensors for collecting the fluid temperature in the corresponding pipelines are installed on the main inlet pipe, the inlet pipe of the main heat exchanger, the inlet pipe of the auxiliary heat exchanger, and the main outlet pipe. A flow sensor for detecting water flow is also installed on the main inlet pipe. The output terminals of the temperature sensor and the flow sensor are respectively connected to the input terminal of the PLC controller.

[0011] To further optimize the technical solution, a main heating valve and an auxiliary heating valve are respectively installed on the heating pipelines of the main heat exchanger and the auxiliary heat exchanger, and the input terminals of the main heating valve and the auxiliary heating valve are respectively connected to the input terminal of the PLC controller.

[0012] To further optimize the technical solution, the control box is equipped with a display screen for displaying the working status information of the heat exchanger unit, status indicator lights for indicating whether the main heat exchanger and auxiliary heat exchanger are in operation, and setting buttons for setting the parameter information of the heat exchanger unit. The output of the setting buttons is connected to the input of the PLC controller, and the output of the PLC controller is connected to the input of the display screen and the status indicator lights respectively.

[0013] The technological advancements achieved by this utility model are as follows, due to the adoption of the above technical solutions.

[0014] This utility model provides a dual-module energy-saving heat exchanger unit, which adopts a parallel design of main and auxiliary modules. Combined with the load detection and automatic adjustment function of the intelligent control module, it can flexibly switch the operating mode (single module operation or dual module coordinated operation) according to the actual heat exchange load. This avoids energy waste of single-module units at low loads, while ensuring heat exchange capacity at high loads, significantly reducing unit energy consumption. In addition, the heat recovery module can recover and reuse waste heat from high-temperature drainage, further improving energy utilization efficiency and meeting the development requirements of energy conservation and emission reduction. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the control box of this utility model.

[0016] The components are as follows: 1. Main heat exchanger, 2. Auxiliary heat exchanger, 3. Inlet main pipe, 4. Main circulating pump, 5. Auxiliary circulating pump, 6. Main temperature control valve, 7. Auxiliary temperature control valve, 8. Water storage tank, 9. Water supply pump, 10. Filter, 11. Water supply pipeline, 12. Heating pipeline, 13. Waste heat exchanger, 14. Insulated water tank, 15. Circulating water pump, 16. Outlet main pipe, 17. Temperature sensor, 18. Flow sensor, 19. Main heating valve, 20. Auxiliary heating valve, 21. Control box, 22. Display screen, 23. Status indicator light, 24. Setting button. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] A dual-module energy-saving heat exchanger unit, combined with Figures 1 to 2As shown, the unit includes a main heat exchanger 1 and an auxiliary heat exchanger 2 connected in parallel. The heating ends of the main heat exchanger 1 and the auxiliary heat exchanger 2 are connected to the heating pipeline 12. The inlet pipes of the main heat exchanger 1 and the auxiliary heat exchanger 2 are connected to the main inlet pipe 3. The outlet pipes of the main heat exchanger 1 and the auxiliary heat exchanger 2 are connected to the main outlet pipe 16. The main circulation pump 4 and the main temperature control valve 6 are respectively installed on the inlet pipe and the outlet pipe of the main heat exchanger 1. The auxiliary circulation pump 5 and the auxiliary temperature control valve 7 are respectively installed on the inlet pipe and the outlet pipe of the auxiliary heat exchanger 2. The heat exchange unit also includes a control box 21 for controlling the operation of the heat exchange unit. The control box is equipped with a PLC controller. The output terminal of the PLC controller is connected to the input terminals of the main circulation pump, the auxiliary circulation pump, the main temperature control valve, and the auxiliary temperature control valve.

[0019] A water circulation mechanism is connected to the main water inlet pipe 3 for heat exchange. The water circulation mechanism includes a water storage tank 8 connected to the main water inlet pipe 3 via a water supply pipe 11 for storing the fluid to be heat exchanged. A water supply pump 9 is installed on the water supply pipe 11 to pump water from the water storage tank into the main water inlet pipe. The input terminal of the water supply pump is connected to the input terminal of the PLC controller. A filter 10 is installed on the water supply pipe 11 between the water supply pump 9 and the main water inlet pipe 3 to filter the water pumped into the water storage tank, preventing impurities from entering the heat exchanger and causing blockage, thus affecting the heat exchange efficiency.

[0020] A heat recovery mechanism is connected to the main outlet pipe 16 to recover and reuse the waste heat in the high-temperature drainage. The heat recovery mechanism includes a waste heat exchanger 13 whose inlet end is connected to the main outlet pipe 16 via a pipe, and whose outlet end is connected to a water storage tank 8 via a pipe. The heat exchange end of the waste heat exchanger 13 is connected to an insulated water tank 14 via a pipe. A circulating water pump 15 is installed on the pipe between the insulated water tank 14 and the waste heat exchanger 13. The input end of the circulating water pump is connected to the output end of a PLC controller. After the high-temperature drainage in the main outlet pipe enters the waste heat exchanger, it exchanges heat with the low-temperature fluid in the insulated water tank. The outlet end of the waste heat exchanger is connected to the water storage tank via a pipe. After the waste heat is recovered, the drainage enters the water storage tank, realizing the recycling of water resources. The insulated water tank is connected to the waste heat exchanger via a circulating water pump. The circulating water pump drives the fluid in the insulated water tank to circulate in the waste heat exchanger, absorbing the waste heat from the high-temperature drainage. The insulated water tank is used to store the recovered waste heat, which can be used to preheat the fluid to be exchanged or to supply domestic hot water, further reducing the unit's energy consumption.

[0021] Temperature sensors 17 are installed on the main water inlet pipe 3, the inlet pipe of the main heat exchanger 1, the inlet pipe of the auxiliary heat exchanger 2, and the main water outlet pipe 16 to collect the fluid temperature of the corresponding pipe. A flow sensor 18 is also installed on the main water inlet pipe 3 to detect the water flow. The output terminals of the temperature sensors and the flow sensors are respectively connected to the input terminals of the PLC controller.

[0022] The main heat exchanger 1 and the auxiliary heat exchanger 2 are respectively equipped with a main heating valve 19 and an auxiliary heating valve 20 on their heating pipelines, which are used to open and close the corresponding heat exchangers to determine whether they are supplying heat. The input terminals of the main heating valve and the auxiliary heating valve are respectively connected to the input terminals of the PLC controller.

[0023] The control box 21 is equipped with a display screen 22, status indicator lights 23 and setting buttons 24. The display screen 22 is used to display the working status information of the heat exchanger unit. The status indicator lights 23 are used to indicate whether the main heat exchanger and the auxiliary heat exchanger are in operation. The setting buttons 24 are used to set the parameter information of the heat exchanger unit. The output of the setting buttons is connected to the input of the PLC controller. The output of the PLC controller is connected to the input of the display screen and the status indicator lights respectively.

[0024] Both the main heat exchanger and the auxiliary heat exchanger are BR0.2-1.0 type plate heat exchangers. The main circulation pump and the auxiliary circulation pump are ISG50-160 type centrifugal pumps. The controller is a PLC S7-200 type controller. The temperature sensor is a PT100 type platinum resistance temperature sensor. The flow sensor is an LWGY-15 type turbine flow meter.

[0025] Taking a building heating scenario as an example, when the heat exchange unit is working, during the peak heating season in winter (high heat exchange load), the temperature sensor detects that the water temperature in the inlet main pipe is 5℃, the target water temperature in the outlet main pipe is 45℃, and the flow sensor detects that the circulation flow rate is 10m³ / h. After the controller calculates the actual heat exchange load, it determines that it is higher than the preset threshold (the preset threshold is set to 80kW based on the building heating area). Then, it controls the main heat exchange module and the auxiliary heat exchange module to run simultaneously: the main circulation pump and the auxiliary circulation pump start, the main temperature control valve and the auxiliary temperature control valve open to 80% opening degree, and the high-temperature heat medium (such as 80℃ hot water) enters the main and auxiliary heat exchangers to exchange heat with the circulating water. The circulating water (45℃) after heat exchange is transported to the building heating system through the outlet main pipe. At the same time, the heat recovery module is activated, and a portion of the high-temperature drainage (40℃) in the main outlet pipe enters the waste heat exchanger to exchange heat with the cold water (15℃) in the insulated water tank. After the water temperature in the insulated water tank rises to 30℃, it is used to preheat the cold water (5℃) in the storage tank. The preheated cold water (25℃) enters the main and auxiliary heat exchangers for heat exchange, reducing the heat consumption of the heat medium.

[0026] During the off-peak heating period (low heat exchange load), the temperature sensor detects that the water temperature in the inlet main pipe is 10℃, the target water temperature in the outlet main pipe is 40℃, and the flow sensor detects that the circulation flow rate is 5m³ / h. After calculating the actual heat exchange load, the controller determines that it is lower than the preset threshold and then controls the auxiliary heat exchange module to stop operating, with only the main heat exchange module operating: the main circulation pump starts, the main temperature control valve opens to 60%, and the high-temperature heat medium enters the main heat exchanger to exchange heat with the circulating water to meet the building's heating needs. At this time, the heat recovery module continues to operate, recovering waste heat for preheating cold water, further reducing energy consumption.

[0027] Through actual operation tests, the energy consumption of this unit during the heating season is reduced by 25% to 30% compared with traditional single-module heat exchange units, the outlet water temperature fluctuation range is controlled within ±2℃, and the waste heat recovery rate reaches more than 60%. The energy-saving effect and heat exchange stability are significantly better than existing technologies.

Claims

1. A dual-module energy-saving heat exchanger unit, characterized in that: The system includes a main heat exchanger (1) and an auxiliary heat exchanger (2) connected in parallel. The heating ends of the main heat exchanger (1) and the auxiliary heat exchanger (2) are respectively connected to the heating pipeline (12). The inlet pipes of the main heat exchanger (1) and the auxiliary heat exchanger (2) are connected to the main inlet pipe (3). The outlet pipes of the main heat exchanger (1) and the auxiliary heat exchanger (2) are connected to the main outlet pipe (16). The main heat exchanger (1) is equipped with a main circulation pump (4) and a main temperature control valve (6) on its inlet and outlet pipes, respectively. The auxiliary heat exchanger (2) is equipped with a main circulation pump (4) and a main temperature control valve (6) on its inlet and outlet pipes, respectively. An auxiliary circulation pump (5) and an auxiliary temperature control valve (7) are respectively installed on the water pipe; a water circulation mechanism for heat exchange is connected to the main water inlet pipe (3), and a heat recovery mechanism for recovering and reusing the waste heat in the high-temperature drainage is connected to the main water outlet pipe (16); the heat exchange unit also includes a control box (21) for controlling the operation of the heat exchange unit, and a PLC controller is installed in the control box. The output end of the PLC controller is connected to the input end of the main circulation pump, the auxiliary circulation pump, the main temperature control valve and the auxiliary temperature control valve respectively.

2. The dual-module energy-saving heat exchanger unit according to claim 1, characterized in that: The water circulation mechanism includes a water storage tank (8) connected to the main water inlet pipe (3) via a water supply pipeline (11), and a water supply pump (9) for pumping water from the water storage tank into the main water inlet pipe is provided on the water supply pipeline (11). The input end of the water supply pump is connected to the input end of the PLC controller.

3. The dual-module energy-saving heat exchanger unit according to claim 2, characterized in that: A filter (10) is installed on the water supply pipeline (11) between the water supply pump (9) and the main water inlet pipe (3) to filter the water pumped into the water storage tank.

4. The dual-module energy-saving heat exchanger unit according to claim 1, characterized in that: The heat recovery mechanism includes a waste heat exchanger (13) whose inlet end is connected to the outlet main pipe (16) via a pipe. The outlet end of the waste heat exchanger (13) is connected to the water storage tank (8) via a pipe. The heat exchange end of the waste heat exchanger (13) is connected to an insulated water tank (14) via a pipe. A circulating water pump (15) is installed on the pipe between the insulated water tank (14) and the waste heat exchanger (13). The input end of the circulating water pump is connected to the output end of the PLC controller.

5. The dual-module energy-saving heat exchanger unit according to claim 1, characterized in that: Temperature sensors (17) for collecting the temperature of the fluid in the corresponding pipeline are installed on the main water inlet pipe (3), the inlet pipe of the main heat exchanger (1), the inlet pipe of the auxiliary heat exchanger (2), and the main water outlet pipe (16); a flow sensor (18) for detecting the water flow is also installed on the main water inlet pipe (3), and the output terminals of the temperature sensor and the flow sensor are respectively connected to the input terminal of the PLC controller.

6. The dual-module energy-saving heat exchanger unit according to claim 1, characterized in that: The main heat exchanger (1) and the auxiliary heat exchanger (2) are respectively equipped with a main heating valve (19) and an auxiliary heating valve (20) on their heating pipelines. The input terminals of the main heating valve and the auxiliary heating valve are respectively connected to the input terminal of the PLC controller.

7. The dual-module energy-saving heat exchanger unit according to claim 1, characterized in that: The control box (21) is equipped with a display screen (22) for displaying the working status information of the heat exchanger unit, a status indicator light (23) for indicating whether the main heat exchanger and the auxiliary heat exchanger are in operation, and a setting button (24) for setting the parameter information of the heat exchanger unit. The output of the setting button is connected to the input of the PLC controller, and the output of the PLC controller is connected to the input of the display screen and the status indicator light respectively.

Images