Valley electricity heat storage cold and hot steam combined supply system and using method thereof

Abstract

The off-peak electricity heat storage cold and hot steam combined supply system comprises an electric boiler and a water supplementing device, the steam output end of the electric boiler is connected with a first heat storage tank, a second heat storage tank and a steam output pipe, and a first valve is installed between the steam inlet end of the first heat storage tank and the steam output end of the electric boiler; a second valve is installed between the steam inlet end of the second heat storage tank and the steam output end of the electric boiler. The system has the beneficial effects that through cooperation of the electric boiler, the first heat storage tank, the second heat storage tank, the steam output pipe and the hot water output pipe, steam can be generated through the electric boiler in the valley electricity period, and the steam is released in the peak electricity period to meet the production requirement; and the first heat storage tank and the second heat storage tank alternately store heat and release steam and hot water, and sustainable production is met, so that the electric energy cost of a factory is effectively reduced, the peak-valley difference of a power grid can be balanced, and the energy utilization rate is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of heat energy supply, and in particular to a valley electricity heat storage cooling, heating and steam cogeneration system and a use method thereof. Background Art

[0002] With economic development and improved living standards, society's demand for electricity continues to grow. This has led to a continuous expansion of power grid capacity and significant changes in electricity consumption, resulting in a widening difference between peak and valley loads across major power grids. Overall, this widening difference between peak and valley loads across major power grids has created a sharp conflict between the grid's peak-shaving capacity and the objective need for such regulation. With the commissioning of power plants built in the past two years, coupled with national macroeconomic regulation and restrictions on high-energy-consuming enterprises, the lack of peak-shaving capabilities during off-peak periods will become even more prominent. The need for grid peak-shaving is crucial in addressing this increasingly severe problem. Utilizing thermal storage technology to store heat generated during off-peak hours for daytime heating can help companies save costs.

[0003] Electric steam boilers are also called electric steam furnaces. Electric steam boilers are steam boilers that use power to heat and generate rated pressure. Electric steam boilers can be used to generate steam for the processing of industrial products such as textiles, printing and dyeing, papermaking, food, rubber, plastics, chemicals, medicine, steel, and metallurgy. They can also be used for heating, bathing, air conditioning, and domestic hot water in enterprises, government agencies, hotels, schools, restaurants, and service industries.

[0004] Some existing valley power thermal storage devices generally use valley power to store heat and release heat energy during peak power hours. However, the ways of releasing heat energy are limited and cannot meet the diverse needs of factories for hot and cold water and steam, resulting in poor practicality of valley power thermal storage devices. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of some existing valley electricity heat storage devices that generally use valley electricity to store heat and release heat energy during peak power periods. However, the ways of releasing heat energy are limited and are not enough to meet the diverse needs of hot and cold water and steam in factories, resulting in poor practicality of valley electricity heat storage devices. A valley electricity heat storage cooling, heating and steam cogeneration system and its use method are provided.

[0006] The objectives of the present invention are achieved through the following technical solutions: a valley power heat storage cooling, heating and steam cogeneration system, comprising an electric boiler and a water replenishment device, wherein the steam output end of the electric boiler is respectively connected to a first heat storage tank, a second heat storage tank and a steam output pipe, a first valve is installed between the steam inlet end of the first heat storage tank and the steam output end of the electric boiler, a second valve is installed between the steam inlet end of the second heat storage tank and the steam output end of the electric boiler, a third valve is installed between the steam output end of the electric boiler and the steam output pipe, a fourth valve is connected between the steam output end of the first heat storage tank and the steam output pipe, and a sixth valve is connected between the steam output end of the second heat storage tank and the steam output pipe;

[0007] The water outlet of the first heat storage tank is connected to the hot water output pipe through the fifth valve, and the water outlet of the second heat storage tank is connected to the hot water output pipe through the seventh valve;

[0008] The water outlet end of the water replenishing device is connected to the water inlet end of the electric boiler, the first heat storage tank and the second heat storage tank respectively.

[0009] By arranging an electric boiler, a first heat storage tank, a second heat storage tank, a steam output pipe and a hot water output pipe in coordination, it is possible to generate steam by using the electric boiler during off-peak hours and release steam during peak hours to meet production needs. By alternately storing heat and releasing steam and hot water in the first heat storage tank and the second heat storage tank, sustainable production can be met, thereby effectively reducing the factory's electricity energy costs, balancing the peak-valley difference of the power grid, and improving energy utilization.

[0010] A further technical solution is to install a steam-water separator on the steam output pipe. By setting up the steam-water separator, the liquid water and suspended water droplets entrained in the steam output pipe can be efficiently separated and removed, thereby effectively preventing corrosion of downstream equipment and improving the service life of downstream equipment.

[0011] A further technical solution is that a temperature reducer and pressure reducer is installed on the hot water output pipe. By setting the temperature reducer and pressure reducer, the high-temperature and high-pressure hot water in the first heat storage tank or the second heat storage tank is produced into hot water of suitable temperature, and the eighth valve is used to meet the heating and heat supply, thereby meeting the heating and hot water supply needs in winter.

[0012] A further technical solution is that the water outlet end of the hot water output pipe is respectively equipped with an eighth valve and, the water outlet end is equipped with a cold water output pipe through a lithium bromide refrigeration machine, and cold water is generated for cooling by setting the lithium bromide refrigeration machine and the cold water output pipe at the water outlet end to meet the demand for combined supply of cold, hot and steam.

[0013] A method for using a valley power thermal storage cooling, heating and steam cogeneration system, comprising:

[0014] S1, water replenishment: replenish water into the electric boiler, the first heat storage tank and the second heat storage tank through the water replenishment device;

[0015] S2, storing steam in the first thermal storage tank: During the off-peak period on the first day, the electric boiler is started to produce steam, and the first valve is opened to transport steam into the first thermal storage tank, so that the steam in the first thermal storage tank is stored in the form of high-temperature and high-pressure saturated water;

[0016] S3, releasing steam from the first thermal storage tank: During the peak electricity period of the next day, the electric boiler and the first valve are closed, and the fourth valve is opened to allow the high-temperature and high-pressure saturated water in the first thermal storage tank to flash evaporate and generate steam that is supplied to production through the steam output pipe;

[0017] S4, storing steam in the second thermal storage tank: During the off-peak period of the next day, the electric boiler is started to produce steam, and the second valve is opened to transport steam into the second thermal storage tank, so that the steam in the second thermal storage tank is stored in the form of high-temperature and high-pressure saturated water;

[0018] S5, the second thermal storage tank releases steam, and the first thermal storage tank releases hot water: During the peak electricity period on the third day, the electric boiler and the second valve are closed, and the sixth valve is opened to flash evaporate the high-temperature and high-pressure saturated water in the second thermal storage tank to generate steam for production through the steam output pipe. At the same time, the fifth valve is opened to supply hot water to the hot water output pipe.

[0019] S6, loop: repeat S1-S5, and open the seventh valve in S3 to transport hot water to the hot water output pipe, so as to realize the alternating heat storage and release of steam and hot water in the first heat storage tank and the second heat storage tank.

[0020] A further technical solution is to open the third valve on the steam output end of the electric boiler to provide steam to the steam output pipe during off-peak hours to meet the steam production requirements during off-peak hours.

[0021] A further technical solution is to install a steam-water separator on the steam output pipe, which is responsible for efficiently separating and removing liquid water and suspended water droplets entrained in the steam.

[0022] A further technical solution is that a temperature and pressure reducing device is installed on the hot water output pipe. The temperature and pressure reducing device is responsible for producing hot water with a suitable temperature from the high-temperature and high-pressure hot water in the first heat storage tank or the second heat storage tank, and meeting the heating and cooling needs through the eighth valve.

[0023] A further technical solution is that the water outlet of the temperature and pressure reducer is connected to a lithium bromide refrigerator, and the seventh valve is responsible for generating cold water and supplying cold water through the cold water output pipe.

[0024] The present invention has the following advantages: the present invention can realize the use of the electric boiler to generate steam during off-peak hours and release steam during peak hours by arranging an electric boiler, a first heat storage tank, a second heat storage tank, a steam output pipe and a hot water output pipe in coordination with each other to meet production needs, and alternately store heat and release steam and hot water by the first heat storage tank and the second heat storage tank to meet sustainable production, thereby effectively reducing the factory's electricity energy cost, and balancing the peak-valley difference of the power grid and improving energy utilization. By arranging a steam-water separator, the present invention can efficiently separate and remove liquid water and suspended water droplets entrained in the steam output pipe, thereby effectively preventing corrosion of downstream equipment and improving the service life of downstream equipment. By arranging a lithium bromide refrigerator and a cold water output pipe at the water outlet, cold water is generated for cooling, thereby meeting the demand for combined supply of cold and hot steam. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the overall structure of the present invention

[0026] In the figure, 1. electric boiler; 2. first heat storage tank; 3. second heat storage tank; 4. steam output pipe; 5. hot water output pipe; 6. cold water output pipe; 7. lithium bromide refrigerator; 8. water supply device; 9. steam-water separator; 10. temperature and pressure reducer; 101. first valve; 102. second valve; 103. third valve; 104. fourth valve; 105. fifth valve; 106. sixth valve; 107. seventh valve; 108. eighth valve; 109. ninth valve. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0029] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0031] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use, or are the orientations or positional relationships commonly understood by those skilled in the art. These terms are intended only to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0033] like Figure 1 As shown, a valley power heat storage cooling, heating and steam cogeneration system and a method of using the same include an electric boiler 1 and a water replenishment device 8. The steam output end of the electric boiler 1 is respectively connected to a first heat storage tank 2, a second heat storage tank 3 and a steam output pipe 4. A first valve 101 is installed between the steam inlet end of the first heat storage tank 2 and the steam output end of the electric boiler 1, a second valve 102 is installed between the steam inlet end of the second heat storage tank 3 and the steam output end of the electric boiler 1, a third valve 103 is installed between the steam output end of the electric boiler 1 and the steam output pipe 4, a fourth valve 104 is connected between the steam output end of the first heat storage tank 2 and the steam output pipe 4, and a sixth valve 106 is connected between the steam output end of the second heat storage tank 3 and the steam output pipe 4.

[0034] The water outlet of the first heat storage tank 2 is connected to the hot water output pipe 5 via the fifth valve 105, and the water outlet of the second heat storage tank 3 is connected to the hot water output pipe 5 via the seventh valve 107;

[0035] The water outlet end of the water replenishing device 8 is connected to the water inlet end of the electric boiler 1, the first heat storage tank 2 and the second heat storage tank 3 respectively.

[0036] By arranging the electric boiler 1, the first heat storage tank 2, the second heat storage tank 3, the steam output pipe 4 and the hot water output pipe 5 in coordination, it is possible to generate steam by using the electric boiler 1 during off-peak hours and release steam during peak hours to meet production needs. By alternately storing heat and releasing steam and hot water in the first heat storage tank 2 and the second heat storage tank 3, sustainable production can be met, thereby effectively reducing the factory's electricity energy costs, balancing the peak-valley difference of the power grid, and improving energy utilization.

[0037] The steam output pipe 4 is provided with a steam-water separator 9. By providing the steam-water separator 9, the liquid water and suspended water droplets entrained in the steam output pipe 4 can be efficiently separated and removed, thereby effectively preventing corrosion of downstream equipment and improving the service life of downstream equipment.

[0038] A temperature reducer and pressure reducer 10 is installed on the hot water output pipe 5. By setting the temperature reducer and pressure reducer 10, the high-temperature and high-pressure hot water in the first heat storage tank 2 or the second heat storage tank 3 is produced into hot water at a suitable temperature, and the eighth valve 108 is used to meet the heating and heating needs, thereby meeting the heating and hot water supply needs in winter.

[0039] The water outlet ends of the hot water output pipe 5 are respectively installed with eighth valves 108 and 109, and the water outlet end of 109 is installed with a cold water output pipe 6 through a lithium bromide refrigerator 7. By setting the lithium bromide refrigerator 7 and the cold water output pipe 6 at the water outlet end of 109, cold water is generated for cooling to meet the demand for combined supply of cold and hot steam.

[0040] A method for using a valley power thermal storage cooling, heating and steam cogeneration system, comprising:

[0041] S1, water replenishment: water is replenished into the electric boiler 1, the first heat storage tank 2 and the second heat storage tank 3 through the water replenishment device 8;

[0042] S2, storing steam in the first thermal storage tank 2: During the off-peak period on the first day, the electric boiler 1 is started to produce steam, and the first valve 101 is opened to transport steam into the first thermal storage tank 2, so that the steam in the first thermal storage tank 2 is stored in the form of high-temperature and high-pressure saturated water;

[0043] S3, the first thermal storage tank 2 releases steam: during the peak electricity period of the next day, the electric boiler 1 and the first valve 101 are closed, and the fourth valve 104 is opened to allow the high-temperature and high-pressure saturated water in the first thermal storage tank 2 to flash evaporate and generate steam that is supplied to production through the steam output pipe 4;

[0044] S4, storing steam in the second thermal storage tank 3: During the off-peak period of the next day, the electric boiler 1 is started to produce steam, and the second valve 102 is opened to transport steam into the second thermal storage tank 3, so that the steam in the second thermal storage tank 3 is stored in the form of high-temperature and high-pressure saturated water;

[0045] S5, the second thermal storage tank 3 releases steam, and the first thermal storage tank 2 releases hot water: During the peak electricity period on the third day, the electric boiler 1 and the second valve 102 are closed, and the sixth valve 106 is opened to flash evaporate the high-temperature and high-pressure saturated water in the second thermal storage tank 3 to generate steam that is supplied to production through the steam output pipe 4. At the same time, the fifth valve 105 is opened to supply hot water to the hot water output pipe 5.

[0046] S6, loop: repeat S1-S5, and open the seventh valve 107 in S3 to transport hot water to the hot water output pipe 5, so as to realize the alternating heat storage and release of steam and hot water in the first heat storage tank 2 and the second heat storage tank 3.

[0047] During off-peak hours, the third valve 103 at the steam output end of the electric boiler 1 can be opened to supply steam to the steam output pipe 4 to meet the steam demand for production during off-peak hours.

[0048] A steam-water separator 9 is installed on the steam output pipe 4. The steam-water separator 9 is responsible for efficiently separating and removing liquid water and suspended water droplets entrained in the steam.

[0049] A temperature reducer and pressure reducer 10 is installed on the hot water output pipe 5. The temperature reducer and pressure reducer 10 is responsible for producing hot water with suitable temperature from the high-temperature and high-pressure hot water in the first heat storage tank 2 or the second heat storage tank 3, and meeting heating and cooling needs through the eighth valve 108.

[0050] The water outlet of the temperature and pressure reducer 10 is connected to the lithium bromide refrigerator 7 via 109 , and the seventh valve 107 is responsible for generating cold water and supplying cold water through the cold water output pipe 6 .

[0051] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A valley electricity heat storage cooling, heating and steam cogeneration system, comprising an electric boiler (1) and a water replenishment device (8), characterized in that: The steam output end of the electric boiler (1) is respectively connected to a first heat storage tank (2), a second heat storage tank (3) and a steam output pipe (4); a first valve (101) is installed between the steam inlet end of the first heat storage tank (2) and the steam output end of the electric boiler (1); a second valve (102) is installed between the steam inlet end of the second heat storage tank (3) and the steam output end of the electric boiler (1); a third valve (103) is installed between the steam output end of the electric boiler (1) and the steam output pipe (4); a fourth valve (104) is connected between the steam output end of the first heat storage tank (2) and the steam output pipe (4); and a sixth valve (106) is connected between the steam output end of the second heat storage tank (3) and the steam output pipe (4); The water outlet of the first heat storage tank (2) is connected to a hot water output pipe (5) via a fifth valve (105), and the water outlet of the second heat storage tank (3) is connected to the hot water output pipe (5) via a seventh valve (107); The water outlet end of the water replenishing device (8) is respectively connected to the water inlet ends of the electric boiler (1), the first heat storage tank (2) and the second heat storage tank (3).

2. The valley electricity thermal storage cooling, heating and steam cogeneration system according to claim 1, characterized in that: A steam-water separator (9) is installed on the steam output pipe (4).

3. The valley electricity thermal storage cooling, heating and steam cogeneration system according to claim 1, characterized in that: A temperature and pressure reducing device (10) is installed on the hot water output pipe (5).

4. The valley electricity thermal storage cooling, heating and steam cogeneration system according to claim 3, characterized in that: The water outlet ends of the hot water output pipe (5) are respectively installed with eighth valves (108) and (109), and the water outlet end of the (109) is installed with a cold water output pipe (6) via a lithium bromide refrigerator (7).

5. A method for using a valley electricity thermal storage cooling, heating and steam cogeneration system, characterized in that: include: S1, water replenishment: water is replenished into the electric boiler (1), the first heat storage tank (2) and the second heat storage tank (3) through the water replenishment device (8); S2, the first thermal storage tank (2) stores steam: during the off-peak period on the first day, the electric boiler (1) is started to produce steam, and the first valve (101) is opened to transport steam into the first thermal storage tank (2), so that the steam in the first thermal storage tank (2) is stored in the form of high-temperature and high-pressure saturated water; S3, the first heat storage tank (2) releases steam: during the peak electricity period of the next day, the electric boiler (1) and the first valve (101) are closed, and the fourth valve (104) is opened, so that the high-temperature and high-pressure saturated water in the first heat storage tank (2) flash evaporates to generate steam that is supplied to production through the steam output pipe (4); S4, the second thermal storage tank (3) stores steam: during the off-peak period of the next day, the electric boiler (1) is started to produce steam, and the second valve (102) is opened to transport steam into the second thermal storage tank (3), so that the steam in the second thermal storage tank (3) is stored in the form of high-temperature and high-pressure saturated water; S5, the second heat storage tank (3) releases steam, and the first heat storage tank (2) releases hot water: during the peak electricity period on the third day, the electric boiler (1) and the second valve (102) are closed, and the sixth valve (106) is opened to flash the high-temperature and high-pressure saturated water in the second heat storage tank (3) to generate steam and supply it to production through the steam output pipe (4), while the fifth valve (105) is opened to deliver hot water to the hot water output pipe (5); S6, cycle: repeat S1-S5, and open the seventh valve (107) in S3 to deliver hot water to the hot water output pipe (5), so as to realize the alternating heat storage and release of steam and hot water in the first heat storage tank (2) and the second heat storage tank (3).

6. The method for using the valley electricity thermal storage cooling, heating and steam cogeneration system according to claim 5, characterized in that: During off-peak hours, the third valve (103) at the steam output end of the electric boiler (1) can be opened to supply steam to the steam output pipe (4), thereby meeting the steam requirements for production during off-peak hours.

7. The method for using the valley electricity thermal storage cooling, heating and steam cogeneration system according to claim 5, characterized in that: A steam-water separator (9) is installed on the steam output pipe (4), and the steam-water separator (9) is responsible for efficiently separating and removing liquid water and suspended water droplets entrained in the steam.

8. The method for using the valley electricity thermal storage cooling, heating and steam cogeneration system according to claim 5, characterized in that: A temperature reducing and pressure reducing device (10) is installed on the hot water output pipe (5). The temperature reducing and pressure reducing device (10) is responsible for producing hot water of suitable temperature from the high-temperature and high-pressure hot water in the first heat storage tank (2) or the second heat storage tank (3), and satisfies heating and cooling needs through the eighth valve (108).

9. The method for using the valley electricity thermal storage cooling, heating and steam cogeneration system according to claim 8, characterized in that: The water outlet of the temperature-reducing and pressure-reducing device (10) is connected to a lithium bromide refrigerator (7) via (109), and the seventh valve (107) is responsible for generating cold water and supplying cold water via the cold water output pipe (6).

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