Waste heat recovery device

Abstract

The utility model discloses a waste heat recovery device which comprises a heat exchanger arranged at a heat source and an energy storage water tank connected with the heat exchanger. A water inlet of the heat exchanger is communicated with a water supply pipeline of the energy storage water tank, a water outlet of the heat exchanger is communicated with a water return pipeline of the energy storage water tank, the water supply pipeline is used for injecting low-temperature water into the heat exchanger, and the water return pipeline is used for inputting high-temperature water in the heat exchanger into the energy storage water tank; the energy storage water tank is provided with a water supplementing pipeline and a hot water pipeline, the water supplementing pipeline is used for injecting low-temperature water into the energy storage water tank, and the hot water pipeline is used for outputting hot water in the energy storage water tank; the control system is used for automatically controlling opening and closing of the water supply pipeline, the water return pipeline, the water supplementing pipeline and the hot water pipeline. The device is compact in structure, flexible to control and convenient to install, has higher waste heat recovery efficiency and good expansibility, and can be used for recovering heat energy in places with heat sources, such as an air compressor, a forging hot workpiece cooling area and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of thermal energy equipment, and in particular relates to a waste heat recovery device. Background Art

[0002] At present, in the machinery manufacturing, chemical pharmaceutical and other industries, it is common to consume gas, oil, coal, electricity, steam and other energy in the form of chemical energy, physical energy, electrical energy, etc. to drive the equipment in the working space of the production and manufacturing site. In the production and manufacturing process, the energy required for chemical and physical changes of the product itself is limited, and this part of the energy exists in the final product of production and manufacturing, such as chemical bonds and molecular structures. On the one hand, most of the energy is emitted to the working space through the shell wall of the equipment used to produce these products, and on the other hand, it is discharged outside the working space through the generated carriers such as wastewater and exhaust gas, resulting in energy waste. In addition, in the process of converting the above-mentioned various forms of energy into the energy required for production and manufacturing, additional heat energy is generated. For example, in the process of electric energy driving the motor, in addition to the mechanical energy generated by the motor, heat energy is also generated, which is also part of the heat energy emitted to the working space.

[0003] Therefore, it is necessary to design a device that can automatically collect heat energy and reuse it, which can save energy and protect the environment while saving money for enterprises. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a waste heat recovery device.

[0005] The technical solution provided by the utility model is as follows:

[0006] A waste heat recovery device comprises a heat exchanger arranged at a heat source, and an energy storage water tank connected to the heat exchanger; the water inlet of the heat exchanger is connected to a water supply pipe of the energy storage water tank, the water outlet of the heat exchanger is connected to a water return pipe of the energy storage water tank, the water supply pipe is used to inject low-temperature water into the heat exchanger, and the water return pipe is used to input high-temperature water in the heat exchanger into the energy storage water tank; the energy storage water tank is provided with a water supply pipe and a hot water pipe, the water supply pipe is used to inject low-temperature water into the energy storage water tank, and the hot water pipe is used to output hot water in the energy storage water tank; the heat exchanger and the energy storage water tank are both provided with water level and temperature probes connected to a control system, and the control system is used to automatically control the switches of the water supply pipe, the water return pipe, the water supply pipe and the hot water pipe.

[0007] Furthermore, the heat exchanger is a plate heat exchanger, which is connected to the smoke exhaust chimney or the heat exhaust pipe via a flange.

[0008] Furthermore, the water inlet of the heat exchanger is provided with an electromagnetic water valve connected to the control system.

[0009] Furthermore, a water pump connected to the control system is provided on the water supply pipeline.

[0010] Furthermore, a water supply valve connected to the control system is provided on the water supply pipeline.

[0011] Furthermore, the hot water pipeline is provided with a constant pressure pump connected to the control system.

[0012] The beneficial effects of the utility model are:

[0013] The utility model is an automatic heat energy collection device with compact structure, flexible control and convenient installation. It can absorb heat through a plate air exchanger according to the characteristics of uncertain heat source temperature and dispersed heat source location, and then store it in a water tank to supply factory production and life use. The device has a high waste heat recovery efficiency and can save a lot of energy for the enterprise; it also has good scalability and can recover heat energy in places with heat sources such as air compressors and forging hot workpiece cooling areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0015] Figure 1 This is a schematic diagram of the structure of a plate heat exchanger provided in one embodiment of the utility model;

[0016] Figure 2 It is a side view of a plate heat exchanger provided by an embodiment of the utility model;

[0017] Figure 3 It is a schematic diagram of a water tank module of a waste heat recovery device provided in one embodiment of the utility model.

[0018] Among them, the figures are represented as: 1-plate heat exchanger, 2-flange, 3-return pipe, 4-water supply pipe, 5-electromagnetic water valve, 6-energy storage tank, 7-control system, 8-water supply pipe, 9-water level and temperature probe, 10-constant pressure pump, 11-hot water pipe, 12-water pump, 13-water inlet, 14-water outlet, 15-temperature probe, 16-water supply valve. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0020] Please refer to Figures 1 to 3 This embodiment provides a waste heat recovery device, which mainly includes a plurality of heat exchangers arranged at different heat sources, and an energy storage water tank connected to the heat exchangers. The heat exchanger used in this embodiment is a plate heat exchanger 1, which is connected to a furnace exhaust chimney or heat exhaust pipe of different diameters through two flanges 2. The water inlet 13 of the plate heat exchanger 1 is connected to the water supply pipe 4 of the energy storage water tank 6 through an electromagnetic water valve 5, and the water outlet 14 of the plate heat exchanger 1 is connected to the return water pipe 3 of the energy storage water tank 6.

[0021] The energy storage water tank 6 is a place to store hot water. The water level and temperature probe 9 of the energy storage water tank 6 can monitor the water level and water temperature in the water tank and transmit them to the control system 7 in real time. The control system 7 controls the water replenishment valve 16 to inject cold water into the water tank through the water replenishment pipe 8 according to the pre-set water level to keep the water level in the water tank within a certain range. The constant pressure pump 10 transports the hot water in the energy storage water tank 6 to the hot water pipe 11 to meet the production and living needs. The control system 7 controls the opening and closing of the electromagnetic water valve 5 and the speed of the water pump 12 to maintain the amount of water in the water supply pipe 4 to ensure that the plate heat exchanger works normally.

[0022] The specific use process of this device is:

[0023] The control system 7 monitors the temperature data sent back by the temperature probes 15 of all plate heat exchangers in real time, and compares it with the water temperature in the energy storage water tank 6. If the temperature of one or several plate heat exchangers 1 exceeds a certain value of the water temperature in the water tank (which can be set according to the situation), the control system 7 sends a signal to open the water inlet electromagnetic valve 5 of the corresponding plate heat exchanger. At this time, the tap water in the water tank is transported to the plate heat exchanger 1 through the water pump 12 and the water supply pipe 4. The tap water is heated after heat exchange in the plate heat exchanger 1, and then returns to the water tank through the return pipe 3, so that the water temperature in the water tank continues to rise. During the heating process, the control system continuously compares the water temperature of each plate heat exchanger and the water tank. Once the temperature of a plate heat exchanger is lower than the water temperature in the water tank, the water inlet electromagnetic valve of the plate heat exchanger is closed, and the cycle is repeated until the water temperature in the water tank rises to the set maximum value and the cycle stops. The hot water in the water tank is supplied to production and life through the constant pressure heat pump 10 at a certain pressure (the pressure can be set according to different situations). When the water level in the water tank is lower than the set lower limit, the tap water replenishment valve 16 opens to replenish water. When the water level reaches the upper limit, the tap water replenishment valve 16 closes and the replenishment ends. As the water temperature in the water tank decreases with the replenishment of tap water, the control system 7 re-compares the water temperature in the water tank with the temperature of each plate heat exchanger and starts a new cycle, thus realizing the recovery and utilization of waste heat from the furnace.

[0024] The plate heat exchanger can not only recover the waste heat from the furnace exhaust, but also recover the heat generated when the hot workpiece is cooled. The specific method is to install an axial flow fan on the air inlet flange to absorb the heat of the hot workpiece into the plate heat exchanger for heat exchange with tap water.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Under the idea of ​​the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A waste heat recovery device, characterized in that: It includes a heat exchanger arranged at a heat source, and an energy storage water tank connected to the heat exchanger; the water inlet of the heat exchanger is connected to the water supply pipe of the energy storage water tank, the water outlet of the heat exchanger is connected to the return pipe of the energy storage water tank, the water supply pipe is used to inject low-temperature water into the heat exchanger, and the return pipe is used to input high-temperature water in the heat exchanger into the energy storage water tank; the energy storage water tank is provided with a water supply pipe and a hot water pipe, the water supply pipe is used to inject low-temperature water into the energy storage water tank, and the hot water pipe is used to output hot water in the energy storage water tank; the heat exchanger and the energy storage water tank are both provided with water level and temperature probes connected to the control system, and the control system is used to automatically control the switches of the water supply pipe, the return pipe, the water supply pipe and the hot water pipe.

2. A waste heat recovery device according to claim 1, characterized in that: The heat exchanger is a plate heat exchanger, which is connected to the exhaust chimney or the heat exhaust pipe through a flange.

3. A waste heat recovery device according to claim 1, characterized in that: The water inlet of the heat exchanger is provided with an electromagnetic water valve connected to the control system.

4. A waste heat recovery device according to claim 1, characterized in that: The water supply pipeline is provided with a water pump connected with the control system.

5. The waste heat recovery device according to claim 1, characterized in that: The water supply pipeline is provided with a water supply valve connected with the control system.

6. A waste heat recovery device according to claim 1, characterized in that: The hot water pipeline is provided with a constant pressure pump connected with the control system.

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