Saline water double-medium heat storage system capable of recycling high-temperature and high-pressure waste heat
By designing a brine dual-media heat storage system for high-temperature and high-pressure waste heat reuse, using flash waste heat to heat debrine and store energy, the problems of energy waste and heat loss in the existing technology are solved, and efficient use of waste heat and reducing energy consumption are achieved. Effect.
Patent Information
- Application Number
- CN202420537339.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-20
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-03-20
AI Technical Summary
In the existing heat storage system, the pollution discharge of water from high-temperature and high-pressure furnaces leads to energy waste and heat loss, and fails to effectively utilize waste heat, affecting the efficient utilization of energy.
Design a brine dual-media heat storage system for high-temperature and high-pressure waste heat reuse, including a desalinate storage device, deaerator, electric heater, heat storage tank, sewage expansion container, sewage tank and heat exchanger, through flash evaporation waste heat pair The desalinated water is heated and the phase change salt is used to store energy to achieve effective heat utilization.
The sewage discharge energy of electric heaters and heat storage tanks is fully utilized, which reduces electricity consumption, reduces operating energy consumption and costs, improves economic benefits, and stores energy through night trough electricity, further reducing operating costs.
Smart Images
Figure CN222211360U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of waste heat utilization, in particular to a brine dual-medium heat storage system for high-temperature and high-pressure waste heat reuse. Background Art
[0002] In the thermal storage system, in order to ensure the efficiency and quality of steam output, the electric heater needs to continuously discharge part of the boiler water with high salt concentration during normal operation. Usually, the discharged high-temperature and high-pressure boiler water is transported to the blowdown expansion tank, where flash evaporation occurs and the generated steam is directly discharged into the atmosphere, resulting in energy waste. The water with high salt concentration that has not been evaporated is directly transported to the blowdown cooling pool and discharged after cooling, without effectively utilizing the waste heat. In addition, when the water level in the thermal storage tank is too high, emergency blowdown is also required. The heat carried by the blowdown water cannot be utilized, resulting in heat and water losses in the system, which is not conducive to the efficient use of energy.
[0003] In order to solve the above problems, the utility model designs a brine dual-medium heat storage system for high-temperature and high-pressure waste heat reuse. Utility Model Content
[0004] In view of the deficiencies in the prior art, the technical problem that the utility model intends to solve is to provide a brine dual-medium heat storage system for high-temperature and high-pressure waste heat reuse.
[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:
[0006] A brine dual-medium heat storage system for high-temperature and high-pressure waste heat reuse comprises a desalted water storage device, a deaerator, an electric heater, a heat storage tank, a blowdown expansion tank, a sewage tank and a heat exchanger; the water supply port of the desalted water storage device is connected to the water inlet of the deaerator, the water outlet of the deaerator is connected to the water inlet of the electric heater, the saturated steam outlet of the electric heater is connected to the steam inlet of the heat storage tank, and the steam outlet of the heat storage tank is connected to an external hot end; the blowdown port of the electric heater and the blowdown port of the heat storage tank are both connected to the water inlet of the blowdown expansion tank, the saturated steam outlet of the blowdown expansion tank is connected to the steam inlet of the deaerator, the blowdown outlet of the blowdown expansion tank is connected to the heat exchanger through the sewage tank, and the heat exchanger is simultaneously connected to an external sewage tank and the desalted water storage device.
[0007] Furthermore, a steam collecting pipe, an annular pipe and a serpentine pipe are provided in the heat storage tank. The steam collecting pipe is coiled in layers in the heat storage tank, and a number of nozzles are evenly distributed on the steam collecting pipe; the annular pipe is wound around the steam collecting pipe, and the serpentine pipe is arranged on the center plane of the heat storage tank, and both the annular pipe and the serpentine pipe are filled with phase change salt.
[0008] Furthermore, the desalted water storage device, deaerator, electric heater, heat storage tank, sewage expansion container, sewage tank and heat exchanger are connected to each other by pipelines, and a check valve is provided on the pipeline.
[0009] Furthermore, the outer surface of the heat storage tank is covered with a heat insulation layer.
[0010] Compared with the prior art, the advantages of the utility model are:
[0011] 1. The system makes full use of the sewage energy of the electric heater and the heat storage tank. The desalted water is heated through the heat exchange of the sewage, which increases the temperature of the desalted water and reduces the power consumption of the electric heater to heat the desalted water. At the same time, the sewage is cooled, making it more convenient to discharge. The saturated steam generated by the flash evaporation of the sewage thermally deoxygenates the desalted water in the deaerator, removes the gas dissolved in the water, reduces the thermal energy consumption required for deoxygenation, and further utilizes the sewage energy. The system makes good use of the high-temperature and high-pressure sewage waste heat for flash evaporation deoxygenation and desalted water heating, which reduces the operating energy consumption and operating costs and improves the economic benefits.
[0012] 2. The electric heater of this system uses low-peak electricity at night to heat and store energy, which effectively reduces the company's operating costs and is conducive to the efficient use of energy. At the same time, there are two media, water and phase change salt, in the heat storage tank, which can store more energy, have a good heat storage effect, and release more heat. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0014] In the figure, 1, desalted water storage device; 2, deaerator; 3, electric heater; 4, heat storage tank; 5, sewage expansion container; 6, sewage tank; 7, heat exchanger; 8, first check valve; 9, second check valve; 10, third check valve; 11, fourth check valve; 12, fifth check valve; 13, sixth check valve; 14, seventh check valve; 15, eighth check valve; 16, ninth check valve; 17, tenth check valve; 18, first check valve water pipe; 19, second water supply pipe; 20, first steam pipe; 21, second steam pipe; 22, first sewage pipe; 23, second sewage pipe; 24, third steam pipe; 25, third sewage pipe; 26, first sewage heat exchange pipe; 27, second sewage heat exchange pipe; 28, first desalted water heat exchange pipe; 29, second desalted water heat exchange pipe; 401, steam collecting pipe; 402, annular pipe; 403, serpentine pipe. DETAILED DESCRIPTION
[0015] Specific embodiments are given below in conjunction with the accompanying drawings. The specific embodiments are only used to introduce the technical solution of the utility model in detail, and are not intended to limit the protection scope of the present application.
[0016] The utility model is a brine dual-medium heat storage system for high-temperature and high-pressure waste heat reuse (referred to as system, see Figure 1 ), comprising a desalted water storage device 1, a deaerator 2, an electric heater 3, a heat storage tank 4, a sewage expansion container 5, a sewage tank 6 and a heat exchanger 7;
[0017] The desalted water storage device 1 is connected to the water inlet of the deaerator 2 through the first water supply pipe 18, and the water outlet of the deaerator 2 is connected to the water inlet of the electric heater 3 through the second water supply pipe 19. The first water supply pipe 18 and the second water supply pipe 19 are respectively provided with a first check valve 8 and a third check valve 10 to prevent water backflow from affecting the safe and stable operation of the system equipment; the saturated steam outlet of the electric heater 3 is connected to the steam collecting pipe 401 in the heat storage tank 4 through the first steam pipe 20, and the steam outlet on the upper part of the heat storage tank 4 is connected to the second steam pipe 21 to supply steam to the outside. The first steam pipe 20 and the second steam pipe 21 are respectively provided with a fourth check valve 11 and a fifth check valve 12 to prevent steam backflow from causing water hammer phenomenon. The sewage outlet of the electric heater 3 is connected to the water inlet of the sewage expansion tank 5 through the first sewage pipe 22 and the seventh check valve 14. The sewage outlet of the hot tank 4 is connected to the water inlet of the sewage expansion tank 5 through the second sewage pipe 23 and the sixth check valve 13; the saturated steam outlet on the upper part of the sewage expansion tank 5 is connected to the steam inlet on the upper part of the deaerator 2 through the third steam pipe 24 and the second check valve 9, the sewage outlet of the sewage expansion tank 5 is connected to the water inlet of the sewage tank 6 through the third sewage pipe 25 and the eighth check valve 15, the water outlet of the sewage tank 6 is connected to the sewage inlet of the heat exchanger 7 through the first sewage heat exchange pipe 26 and the ninth check valve 16, the sewage outlet of the heat exchanger 7 is connected to the external sewage pool through the second sewage heat exchange pipe 27, the desalted water inlet of the heat exchanger 7 is connected to the desalted water storage device 1 through the first desalted water heat exchange pipe 28 and the tenth check valve 17, and the desalted water outlet of the heat exchanger 7 is connected to the desalted water storage device 1 through the second desalted water heat exchange pipe 29.
[0018] The heat exchanger 7 is a plate heat exchanger, which is composed of a series of stacked metal plates. A narrow and tortuous channel is formed between two adjacent plates. The cold and hot fluids flow through the channel respectively. The cold and hot fluids are separated by the plates in the middle, and heat is transferred through the plates to achieve heat exchange between the cold and hot fluids.
[0019] The heat storage tank 4 is filled with water medium, which is completely filled to reserve space for flash evaporation; a steam-water separator is provided on the upper part of the heat storage tank 4 to separate steam from water; a steam collecting pipe 401, an annular pipe 402 and a serpentine pipe 403 are provided in the heat storage tank 4, the steam collecting pipe 401 is layered and coiled in the heat storage tank 4, and a number of nozzles are evenly distributed on the lower side of the steam collecting pipe 401; the annular pipe 402 is evenly wound on the steam collecting pipe 401, and the serpentine pipe 403 is arranged on the central plane of the heat storage tank 4, and the annular pipe 402 and the serpentine pipe 403 are filled with phase change salt as heat exchange medium, and the steam collecting pipe 401, the annular pipe 402 and the serpentine pipe 403 are independent of each other. The outer surface of the heat storage tank 4 is covered with a heat insulation layer, which can be made of high-strength hydrophobic aluminum silicate fiber felt to prevent heat loss in the heat storage tank 4.
[0020] The working principle and workflow of the utility model are:
[0021] When the system is running, the desalted water in the desalted water storage device 1 enters the deaerator 2 through the first water supply pipe 18, and is deoxygenated in the deaerator 2 to obtain desalted and deoxygenated water; the desalted and deoxygenated water enters the electric heater 3 through the second water supply pipe 19 to be heated to produce saturated steam, and the saturated steam enters the steam collecting pipe 401 in the heat storage tank 4 through the first steam pipe 20. On the one hand, the saturated steam is ejected from the nozzle into the water medium to heat the water medium; on the other hand, the heat carried by the saturated steam is transferred to the annular pipe 402 by heat conduction, and the phase change salt in the annular pipe 402 absorbs the heat and melts, and stores the heat in the phase change salt; since the heat absorbed by the phase change salt in the annular pipe 402 comes from the saturated steam, the heating rate of the annular pipe 402 is faster than that of the water medium in the heat storage tank 4, so the annular pipe 402 exchanges heat with the water medium to promote the heating of the water medium. After the water medium is heated up, it exchanges heat with the phase change salt in the serpentine tube 403, causing the phase change salt to melt and store heat in the phase change salt.
[0022] When heat is needed, the steam outlet at the top of the heat storage tank 4 is opened. Due to the sudden drop in pressure, the high-temperature and high-pressure saturated water in the heat storage tank 4 flashes at its top to generate saturated steam, which is output through the second steam pipe 21 to supply steam to the outside. During the continuous flash evaporation process, the temperature of the water medium in the heat storage tank 4 continues to decrease. When the temperature is lower than the melting point of the phase change salt, the phase change salt in the annular tube 402 and the serpentine tube 403 releases heat to heat the water medium, thereby reducing the rate at which the temperature of the water medium in the heat storage tank 4 drops suddenly.
[0023] The high-temperature and high-pressure sewage generated by the electric heater 3 during operation enters the sewage expansion tank 5 through the first sewage pipe 22. When the water level in the heat storage tank 4 is too high, the high-temperature and high-pressure sewage in the heat storage tank 4 also enters the sewage expansion tank 5 through the second sewage pipe 23. Due to the sudden drop in pressure in the sewage expansion tank 5, the high-temperature and high-pressure sewage flashes in the sewage expansion tank 5 to produce saturated steam and saturated water. Among them, the saturated steam enters the deaerator 2 from the sewage expansion tank 5 through the third steam pipe 24, and heats the desalted water in the deaerator 2 to the saturated temperature under the corresponding pressure, thereby removing the oxygen in the desalted water to obtain desalted and deoxygenated water. The saturated water enters the sewage tank 6 through the third sewage pipe 25, and then enters the heat exchanger 7 through the first sewage heat exchange pipe 26. According to the principle of convection heat transfer, heat is transferred through the plates of the heat exchanger 7, and the heat carried by the saturated water is used to heat the desalted water entering the heat exchanger 7. The heated desalted water is returned to the desalted water storage device 1 through the second desalted water heat exchange pipe 29, thereby increasing the temperature of the desalted water and reducing energy consumption. The water that has been cooled after heat exchange in the heat exchanger 7 enters the sewage tank through the second sewage heat exchange pipe 27 for discharge.
[0024] The system utilizes the high-temperature and high-pressure sewage from the electric heater 3 and the heat storage tank 4 for flash evaporation. On the one hand, it increases the temperature of the desalted water in the desalted water storage device 1, and on the other hand, it thermally deoxygenates the desalted water in the deaerator 2, which not only fully utilizes the waste heat of the high-temperature and high-pressure sewage, but also reduces the energy consumption of the system, thereby realizing efficient utilization of the waste heat of the high-temperature and high-pressure sewage.
[0025] Anything not described in the present invention is applicable to the prior art.
Claims
1. A brine dual-medium heat storage system for high-temperature and high-pressure waste heat reuse, comprising a desalted water storage device, a deaerator, an electric heater and a heat storage tank; characterized in that: The system also includes a blowdown expansion vessel, a blowdown tank and a heat exchanger; The water supply port of the desalted water storage device is connected to the water inlet of the deaerator, the water outlet of the deaerator is connected to the water inlet of the electric heater, the saturated steam outlet of the electric heater is connected to the steam inlet of the heat storage tank, and the steam outlet of the heat storage tank is connected to the external hot end; the sewage outlet of the electric heater and the sewage outlet of the heat storage tank are both connected to the water inlet of the sewage expansion tank, the saturated steam outlet of the sewage expansion tank is connected to the steam inlet of the deaerator, the sewage outlet of the sewage expansion tank is connected to the heat exchanger through the sewage tank, and the heat exchanger is connected to the external sewage tank and the desalted water storage device at the same time.
2. The brine dual-medium thermal storage system for high-temperature and high-pressure waste heat reuse according to claim 1 is characterized in that: The heat storage tank is provided with a steam collecting pipe, an annular pipe and a serpentine pipe. The steam collecting pipe is coiled in layers in the heat storage tank, and a number of nozzles are evenly distributed on the steam collecting pipe. The annular pipe is wound around the steam collecting pipe, and the serpentine pipe is arranged on the central plane of the heat storage tank. The annular pipe and the serpentine pipe are both filled with phase change salt.
3. The brine dual-medium thermal storage system for high-temperature and high-pressure waste heat reuse according to claim 1 is characterized in that: The desalted water storage device, the deaerator, the electric heater, the heat storage tank, the sewage expansion container, the sewage tank and the heat exchanger are connected to each other by pipelines, and a check valve is arranged on the pipeline.
4. The brine dual-medium thermal storage system for high-temperature and high-pressure waste heat reuse according to any one of claims 1 to 3, characterized in that: The outer surface of the heat storage tank is covered with a heat insulation layer.