Power generation system based on electric steam heat accumulator
By introducing electric steam heat storage into the wind power system, the electric energy of wind power is converted into steam, stored during peak power periods and converted into electric energy during peak power periods, the low utilization rate of wind power resources and difficulty in energy storage and site selection are solved. The problem is that efficient wind power storage and utilization has been achieved.
Patent Information
- Application Number
- CN202421185707.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-28
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-05-28
AI Technical Summary
The intermittent and random nature of wind power resources lead to difficulty in peak shaving of power grids. In the northwest, northeast and north China, wind power installed capacity is too large but the power consumption capacity is limited, resulting in the problem of "wind abandonment". The existing energy storage technology has site selection restrictions, Problems such as high investment costs or large energy conversion losses.
A power generation system based on electric steam heat storage is designed, including fan generators, steam turbines, generators, cooling towers and heat storage systems, through condensers, low-pressure heaters, deaerators, high-pressure heaters and electric steam The heat storage device uses the electricity energy during the wind power generation period to convert it into steam, stores it during the peak power period and converts it into electricity during the peak power period to supply heat to generate electricity.
It improves the utilization rate of wind power generation, reduces the energy consumption of thermal power generation, saves energy and reduces emissions, and reduces energy storage site selection requirements and energy conversion losses. It has high energy storage density, which has important economic significance and promotion value.
Smart Images
Figure CN222208037U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of power generation, in particular to a power generation system based on an electric steam heat accumulator. Background Art
[0002] Wind energy is a highly efficient, clean, and renewable energy source. However, due to its intermittent, random, and volatile nature, periods of low electricity demand often coincide with periods of peak wind turbine output, making peak load regulation difficult for the power grid and causing significant fluctuations in grid voltage and frequency. Furthermore, Northwest, Northeast, and North China are the primary concentrations of my country's wind power resources. In recent years, these regions have seen a surge in wind power station construction, resulting in excessive installed capacity. However, due to their relatively low levels of development, their ability to absorb electricity is limited. Transmitting large amounts of electricity to areas with high electricity demand requires long-distance transmission lines, leading to a significant problem of "wind curtailment." Therefore, energy storage at wind power stations is imperative.
[0003] Existing energy storage technologies primarily include battery storage, compressed air storage, and pumped hydro. Pumped hydro resources are limited, site selection is constrained by geographical conditions, construction cycles are long, and investment costs are increasing year by year. Lithium batteries, the primary technology for battery energy storage applications, offer long lifespans and high efficiency, but they still face challenges in safety and cost. Compressed air storage offers the advantages of a short construction cycle, relatively easy site selection, and a more eco-friendly environment. However, energy conversion losses and the large volume and weight of storage tanks limit its scalability.
[0004] Steam accumulators are steam containers that use water as a heat storage medium. The technology is relatively mature and widely used across multiple industries, helping to smooth out peak and valley steam demand. Currently, there are no reports of wind power generation systems based on steam accumulators. Summary of the Invention
[0005] In view of this, the present invention proposes a power generation system based on an electric steam heat accumulator.
[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:
[0007] The power generation system based on the electric steam accumulator described in the utility model includes a fan generator and an electric power generation system, the electric power generation system includes a steam turbine, a generator and a cooling tower, the power generation system also includes a heat storage system, the heat storage system includes a condenser, a low-pressure heater, a deaerator, a high-pressure heater and an electric steam accumulator connected in sequence through pipelines, the steam outlet of the electric steam accumulator is connected in sequence to a steam-water separator, a first superheater and a second superheater through pipelines, the outlet of the second superheater is connected to the steam turbine, and the water outlet of the steam-water separator is connected to the electric steam accumulator;
[0008] Wherein, the condenser is connected to the exhaust port of the steam turbine, a first pump is arranged between the condenser and the deaerator, a second pump is arranged between the high-pressure heater and the electric steam accumulator, the fan generator is electrically connected to the electric steam accumulator, and the sewage outlet of the electric steam accumulator is connected to the sewage expansion device.
[0009] The beneficial effects are as follows: This utility model uses an electric steam accumulator to convert wind power electricity into steam, and then converts steam into electricity during peak power periods, thus achieving wind power energy storage, improving wind power utilization, reducing thermal power generation energy consumption, and saving energy and reducing emissions. The utility model uses an electric steam accumulator for energy storage, which has relatively low site requirements and low energy conversion losses. Compared with compressed air energy storage technology, this utility model has a higher energy storage density and has important economic significance and promotion value.
[0010] Preferably, the first superheater is a platen superheater, the second superheater is a convection superheater, and a plurality of steam branches connected to the steam turbine are connected in parallel to the steam pipeline at the outlet of the second superheater.
[0011] Preferably, the deaerator is a horizontal headless deaerator, and its inlet is also connected to the softening pipeline.
[0012] Preferably, the condenser and the cooling tower form a condensing loop through a connecting pipeline, and a circulating pump is provided on the condensing loop. On the one hand, the condensing loop can condense the steam passing through the condenser (coming out of the condenser) to obtain condensed water of a certain temperature, and on the other hand, the low-temperature cooling water coming out of the cooling tower absorbs heat and becomes high-temperature cooling water, which enters the cooling tower again, which is conducive to the evaporation of heat in the cooling tower.
[0013] Compared with the existing technology, the utility model uses a steam accumulator to store the energy of wind power generation, which has relatively low site selection requirements and is conducive to popularization and promotion; compared with the existing air-compressed energy storage, the utility model has a high energy storage density, increases the storage capacity of wind power, and thus greatly improves the utilization rate of wind power. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the present utility model. DETAILED DESCRIPTION
[0015] The following is a detailed description of an embodiment of the present invention in conjunction with the accompanying drawings. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process. However, the protection scope of the present invention is not limited to the following embodiment.
[0016] It should be noted that, in the description of the present utility model, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.
[0017] In the description of this utility model, unless otherwise specified or limited, the terms "connected" and "connection" that may appear should be understood in a broad sense. For example, it can mean fixed connection, detachable connection, or integral connection; it can mean mechanical connection or electrical connection; it can mean direct connection or indirect connection through an intermediate medium, or it can mean internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood based on specific circumstances.
[0018] like Figure 1 As shown, the power generation system based on the electric steam heat accumulator of the present invention includes a fan generator 1 and an electric power generation system, and the electric power generation system includes a steam turbine 2, a generator 3 and a cooling tower 4;
[0019] The power generation system of the present invention also includes a heat storage system, which includes a condenser 5, a low-pressure heater 6, a deaerator 7, a high-pressure heater 8 and an electric steam accumulator 9 connected in sequence through pipelines. A first pump P1 is provided between the condenser 5 and the deaerator 7, a second pump P2 is provided between the high-pressure heater 8 and the electric steam accumulator 9, a fan generator 1 is electrically connected to the electric steam accumulator 9, the fan generator 1 provides power to the electric steam accumulator 9, and a sewage outlet of the electric steam accumulator 9 is connected to a sewage expansion device;
[0020] During periods of strong winds and low electricity consumption, the wind turbine 1 provides electricity to the electric steam accumulator 9, thereby heating the water in the electric steam accumulator 9 until the pressure in the electric steam accumulator 9 reaches the maximum charging pressure, thereby storing wind power during the low electricity consumption period.
[0021] The condenser 5 is connected to the exhaust port of the steam turbine 2. A condensing loop is formed between the condenser 5 and the cooling tower 4 through a connecting pipeline. A circulating pump P3 is provided on the condensing loop. That is, the low-temperature cooling water from the cooling tower 4 is used to perform heat exchange on the steam from the steam turbine 2, so that the steam is condensed into water and the low-temperature cooling water is converted into high-temperature cooling water. The high-temperature cooling water enters the cooling tower 4 from the upper part of the cooling tower 4. The condensed water is heated for the first time by the low-pressure heater 6, deoxygenated by the deaerator 7, and then heated for the second time by the high-pressure heater 8 before entering the electric steam accumulator 9. During off-peak hours with strong winds, the wind power can be used to heat the water in the electric steam accumulator 9 to a saturated state until the maximum charging pressure is reached.
[0022] The steam outlet of the electric steam accumulator 9 is connected to the steam turbine 2 through a pipeline, and the electric steam accumulator 9 provides superheated steam for the steam turbine 2; a steam-water separator 10, a first superheater 11 and a second superheater 12 are sequentially arranged between the electric steam accumulator 9 and the steam turbine 2, and the water outlet of the steam-water separator 10 is connected to the electric steam accumulator 9; when releasing heat, saturated steam first enters the steam-water separator 10, and the steam-water separator 10 separates the steam and water, and the separated hot water is sent to the electric steam accumulator 9 again; the saturated steam after steam-water separation becomes superheated steam after passing through the first superheater 11 and the second superheater 12 and enters the steam turbine 2, providing superheated steam for the steam turbine 2, and further providing power generation energy for thermal power generation.
[0023] During actual installation, the first superheater 11 uses a screen superheater, and the second superheater 12 uses a convection superheater. The steam pipeline L1 at the outlet of the second superheater 12 is connected in parallel with multiple steam branches L2 connected to the turbine 2; the deaerator 7 is a horizontal headless deaerator 7, and its inlet is also connected to the softening pipeline L3. Soft water enters the deaerator 7 through the softening pipeline, and after deoxygenation, it is heated by the high-pressure heater 8 and sent to the electric steam accumulator 9 to ensure that the water filling coefficient of the electric steam accumulator 9 is constant at 0.85~0.9, so that its electric heating pipe is located below the water level.
[0024] The working process and principle of the utility model are as follows: soft water (tap water is treated with a softening water device to remove calcium ions and magnesium ions in the water) enters the deaerator 7, is heated by hot water from the low-pressure heater 6 in the deaerator 7, and then enters the high-pressure heater 8 under the action of the second pump P2 to be heated to obtain high-temperature saturated water, and then enters the electric steam accumulator 9; during the off-peak period of electricity consumption when the wind is strong, the excess wind power is used to provide electricity to the electric steam accumulator 9, and the high-temperature saturated water is heated to form hot saturated steam through the electric heating pipe. Until the maximum allowable heating pressure is reached, the excess wind power is converted into steam energy, thereby improving the utilization rate of wind power. During the peak period of electricity consumption when the wind is weak, the saturated steam in the electric steam accumulator 9 first enters the steam-water separator 10 for separation to remove water from the steam. The separated steam is then heated in succession by the first superheater 11 and the second superheater 12 to obtain superheated steam and send it to the steam turbine 2, so that the blades of the steam turbine 2 rotate and work, thereby driving the generator to generate electricity and perform thermal power generation to meet the electricity needs of users.
[0025] The utility model adopts a steam accumulator to store the energy of wind power generation, which has relatively low site selection requirements and is conducive to popularization and promotion; compared with existing air-compressed energy storage, steam has a high energy storage density, which increases the storage capacity of wind power, thereby greatly improving the utilization rate of wind power.
[0026] Finally, it should be emphasized that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Therefore, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.
Claims
1. A power generation system based on an electric steam accumulator, comprising a fan generator and an electric power generation system, wherein the electric power generation system comprises a steam turbine, a generator and a cooling tower, characterized in that: The power generation system further includes a heat storage system, which includes a condenser, a low-pressure heater, a deaerator, a high-pressure heater and an electric steam accumulator connected in sequence through pipelines, a steam outlet of the electric steam accumulator is connected in sequence with a steam-water separator, a first superheater and a second superheater through pipelines, an outlet of the second superheater is connected to the steam turbine, and a water outlet of the steam-water separator is connected to the electric steam accumulator; Wherein, the condenser is connected to the exhaust port of the steam turbine, a first pump is arranged between the condenser and the deaerator, a second pump is arranged between the high-pressure heater and the electric steam accumulator, the fan generator is electrically connected to the electric steam accumulator, and the sewage outlet of the electric steam accumulator is connected to the sewage expansion device.
2. The power generation system based on electric steam accumulator according to claim 1, characterized in that: The first superheater is a platen superheater, the second superheater is a convection superheater, and a plurality of steam branches connected to the steam turbine are connected in parallel to the steam pipeline at the outlet of the second superheater.
3. The power generation system based on electric steam accumulator according to claim 1, characterized in that: The deaerator is a horizontal headless deaerator, and its inlet is also connected to the softening pipeline.
4. The power generation system based on electric steam accumulator according to claim 1, characterized in that: The condenser and the cooling tower form a condensing loop through a connecting pipeline, and a circulating pump is arranged on the condensing loop.