Calculation method for pipe blowing coefficient of compressed air energy storage power station by pressure stabilization method

Abstract

The invention relates to the technical field of compressed air energy storage power stations, and discloses a compressed air energy storage power station pressure stabilization method blowpipe coefficient calculation method, which comprises the following steps: obtaining the volume flow and density of air under a blowpipe working condition, and obtaining the air pressure and air temperature of the blowpipe working condition; according to the volume flow and density of air under the pipe blowing working condition, the pipe blowing working condition air pressure and the pipe blowing working condition air temperature, the pipe blowing working condition air flow is calculated; and the rated working condition air flow of the compressor is obtained, and the pipe blowing working condition air flow, the pipe blowing working condition air pressure and the pipe blowing working condition air temperature are combined to calculate the pressure stabilization method pipe blowing coefficient. According to the method, the characteristics of the large compressed air energy storage power station are combined, the calculation method for calculating the point air momentum under the pipe blowing working condition is designed, the calculation formula of the pipe blowing coefficient is designed, and the blank of the calculation method for the pipe blowing coefficient of the compressed air energy storage power station is filled; and a scientific basis is provided for parameter control in the pipe blowing process of a large compressed air energy storage power station.

Description

Technical Field

[0001] This invention relates to the field of compressed air storage power station technology, and in particular to a method for calculating the blowdown coefficient of a compressed air storage power station using the pressure stabilization method. Background Technology

[0002] Renewable energy sources, such as wind power and photovoltaic power, are accelerating the low-carbon transformation of my country's energy structure. However, the intermittency and instability of wind power and photovoltaic power urgently require large-scale energy storage to ensure the stable operation of the energy grid.

[0003] Compressed air energy storage (CAES) technology boasts advantages such as large capacity, long operating cycle, high efficiency, low cost, high safety factor, and good economic performance. It is a promising new energy storage technology suitable for large-scale deployment. The basic principle of CAES is that during off-peak electricity demand periods, a compressor consumes excess electrical energy (such as off-peak electricity, wind power curtailment, and solar power curtailment) to compress air to high pressure and store it in air tanks or underground cavities. During peak electricity demand periods, the high-pressure air is released and converted into electrical energy through a specially constructed turbine, thereby achieving peak shaving and valley filling of the power grid and improving grid stability and reliability.

[0004] Compared to conventional thermal power generation systems, compressed air energy storage systems are much larger, with larger and heavier pipelines, numerous heat exchangers, and greater installation and construction challenges. During the manufacturing, transportation, storage, and installation processes, various impurities (such as iron filings, rust, welding slag, sand, and scale) can remain in the pipelines of compressed air energy storage power generation systems, posing significant safety hazards to the subsequent stable operation of the unit. Therefore, purging the pipelines of compressed air energy storage power generation systems to remove residual impurities and ensure the safe startup of the unit has become an urgent problem to be solved.

[0005] Defects and shortcomings of existing technology:

[0006] 1. Compressed air energy storage power stations are still in the development stage. Currently, the ones already in operation are all small-capacity compressed air energy storage power stations with relatively simple pipelines. Their pipeline purging processes are also relatively simple, and the purging coefficient is not strictly controlled. Therefore, it is particularly important to invent a new method for calculating the purging coefficient of large-scale compressed air energy storage power stations.

[0007] 2. Currently, most thermal power generating units use the pressure reduction method for purging. However, this method involves numerous pressure reduction purging cycles with short effective times and durations. Furthermore, each purging cycle causes a rapid change in pressure and temperature, resulting in a stress cycle that leads to hidden lifespan losses for pipeline components. Therefore, for large-scale compressed air energy storage power stations, it is of great significance to develop a method for calculating the purging coefficient using the pressure stabilization method to control the entire purging process. Summary of the Invention

[0008] This invention provides a method for calculating the blow-out coefficient of compressed air energy storage power stations using the pressure stabilization method. Combining the characteristics of large-scale compressed air energy storage power stations, it designs a method for calculating the air momentum at the calculation point under blow-out conditions, as well as a formula for calculating the blow-out coefficient. This fills the gap in the calculation method of the blow-out coefficient of compressed air energy storage power stations and provides a scientific basis for parameter control during the blow-out process of large-scale compressed air energy storage power stations.

[0009] This invention provides a method for calculating the blowdown coefficient of a compressed air storage power station using the pressure stabilization method, comprising:

[0010] Obtain the volumetric flow rate and density of air under blowdown conditions, as well as the air pressure and temperature under blowdown conditions;

[0011] The air flow rate under the blowdown condition is calculated based on the volumetric flow rate and density of the air, the air pressure under the blowdown condition, and the air temperature under the blowdown condition.

[0012] Obtain the compressor's rated operating air flow rate, and calculate the pressure stabilization method blowing coefficient based on the compressor's rated operating air flow rate, blowing air flow rate, blowing air pressure, and blowing air temperature.

[0013] Furthermore, in the step of calculating the air flow rate under the blowdown condition based on the volumetric flow rate and density of the air, the air pressure under the blowdown condition, and the air temperature under the blowdown condition, the calculation formula is as follows:

[0014]

[0015] Among them, D b V represents the air flow rate under blowdown conditions, in t / h. b The volumetric airflow rate under blowdown conditions is expressed in m³. 3 / h; ρ0 represents the density of air under standard conditions, kg / m³ 3 ;P b T0 represents the air pressure under blowdown conditions, in Pa; T0 represents the temperature under standard conditions, in K; P0 represents the atmospheric pressure under standard conditions, in Pa; T b This indicates the air temperature during blowdown operation, in Kelvin (K).

[0016] Furthermore, the air volumetric flow rate V during the blowdown operation... b The flow rate was measured using the compressor manufacturer's own flow meter.

[0017] Furthermore, the density of the air during the blowdown process is based on the air temperature T during the blowdown process. b and air pressure P b Perform corrective calculations.

[0018] Furthermore, the rated operating air flow rate of the compressor is the rated operating air flow rate designed for the compressor.

[0019] Furthermore, in the step of obtaining the compressor's rated operating air flow rate and calculating the blow-through coefficient using the pressure stabilization method based on the compressor's rated operating air flow rate, blow-through air flow rate, blow-through air pressure, and blow-through air temperature, the calculation formula is as follows:

[0020]

[0021] Where K represents the blowdown coefficient applicable to the pressure stabilization method of a 300MW compressed air storage power station, and D... b D represents the airflow rate under blowdown conditions, in t / h. a The compressor's rated airflow rate is expressed in t / h; ρ0 represents the density of air under standard conditions, in kg / m³. 3 P0 represents standard atmospheric pressure, Pa; T0 represents standard temperature, K; P b Indicates the air pressure during blowdown operation, in Pa; T b This indicates the air temperature during blowdown operation, in Kelvin (K).

[0022] Furthermore, in the actual blowing process, if the blowing coefficient at a certain point is less than 1, the pressure or temperature at that point is adjusted to make the blowing coefficient greater than 1.

[0023] The present invention also provides a calculation device for the blowdown coefficient of the pressure stabilization method in a compressed air storage power station, comprising:

[0024] The acquisition module is used to acquire the volumetric flow rate and density of air under the blowing operation condition, as well as the air pressure and air temperature under the blowing operation condition.

[0025] The first calculation module is used to calculate the air flow rate under the blowing operation condition based on the volumetric flow rate and density of the air under the blowing operation condition, the air pressure under the blowing operation condition, and the air temperature under the blowing operation condition.

[0026] The second calculation module is used to obtain the compressor's rated operating air flow rate and calculate the pressure stabilization method blowing coefficient based on the compressor's rated operating air flow rate, blowing air flow rate, blowing air pressure, and blowing air temperature.

[0027] The present invention also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the above-described method.

[0028] The present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the above-described method.

[0029] The beneficial effects of this invention are as follows:

[0030] This invention obtains the volumetric flow rate and density of air under blowdown conditions, as well as the air pressure and temperature under blowdown conditions, and calculates the air flow rate under blowdown conditions based on these values. Furthermore, it calculates the blowdown coefficient using the pressure-stabilized method by combining this with the air flow rate under the compressor's rated operating conditions. The invention also designs a method for calculating the air momentum at the calculation point under blowdown conditions, a method for calculating the air momentum at the calculation point under rated operating conditions, and a formula for calculating the blowdown coefficient. Simultaneously, the selection of blowdown parameters must ensure that the blowdown coefficient at all points in the purged system is greater than 1. During the blowdown process, necessary adjustments to the blowdown parameters should be made according to the actual situation. This invention fills the gap in the calculation method of the blowdown coefficient for compressed air energy storage power stations, providing a scientific basis for parameter control during the blowdown process of large-scale compressed air energy storage power stations. It is applicable to large-scale compressed air energy storage power stations using the pressure-stabilized method for blowdown, reducing the lifespan loss of pipeline components caused by blowdown. Attached Figure Description

[0031] Figure 1 This is a flowchart illustrating the calculation method of the blowdown coefficient for the pressure stabilization method of the compressed air storage power station according to the present invention.

[0032] Figure 2 This is a schematic diagram of the device for calculating the blowdown coefficient of the compressed air storage power station using the pressure stabilization method according to the present invention.

[0033] Figure 3 This is a schematic diagram of the internal structure of a computer device according to an embodiment of the present invention.

[0034] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0035] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0036] This invention proposes a method for calculating the blow-through coefficient of a 300MW compressed air energy storage power station using the pressure stabilization method. Considering the characteristics of large-scale compressed air energy storage power stations, the calculation method includes: a method for calculating the air momentum at the calculation point under blow-through conditions; a method for calculating the air momentum at the calculation point under rated conditions; a formula for calculating the blow-through coefficient; the selection of blow-through parameters must ensure that the blow-through coefficient at all points in the purged system is greater than 1; and during the blow-through process, the blow-through parameters should be adjusted as necessary according to the actual situation.

[0037] like Figure 1 As shown, this invention provides a method for calculating the blowdown coefficient of a compressed air storage power station using the pressure stabilization method, comprising:

[0038] S1. Obtain the volumetric flow rate and density of air under the blowdown condition, as well as the air pressure and temperature under the blowdown condition.

[0039] S2. Calculate the air flow rate under the blowing conditions based on the air volumetric flow rate and density, air pressure, and air temperature under the blowing conditions; the calculation formula is:

[0040]

[0041] Among them, D b V represents the air flow rate under blowdown conditions, in t / h. b The volumetric airflow rate under blowdown conditions is expressed in m³. 3 / h; ρ0 represents the density of air under standard conditions, kg / m³ 3 ;P b T0 represents the air pressure under blowdown conditions, in Pa; T0 represents the temperature under standard conditions, in K; P0 represents the atmospheric pressure under standard conditions, in Pa; T b This indicates the air temperature during blowdown operation, in Kelvin (K).

[0042] Wherein, the air volume flow rate V under the blowpipe condition b The flow rate is measured by the compressor manufacturer's own flow meter; the density of the air during the blow-through process is based on the air temperature T during the blow-through process. b and air pressure P b Correction calculations are performed; the rated airflow of the compressor under operating conditions is the rated airflow designed for the compressor under operating conditions.

[0043] S3. Obtain the compressor's rated operating air flow rate, and calculate the pressure-stabilized blowing coefficient based on the compressor's rated operating air flow rate, blowing air flow rate, blowing air pressure, and blowing air temperature. The calculation formula is:

[0044]

[0045] Where K represents the blowdown coefficient applicable to the pressure stabilization method of a 300MW compressed air storage power station, and D... b D represents the airflow rate under blowdown conditions, in t / h. a The compressor's rated airflow rate is expressed in t / h; ρ0 represents the density of air under standard conditions, in kg / m³. 3 P0 represents standard atmospheric pressure, Pa; T0 represents standard temperature, K; P b Indicates the air pressure during blowdown operation, in Pa; T b This indicates the air temperature during blowdown operation, in Kelvin (K).

[0046] In actual blowing process, if the blowing coefficient at a certain point is less than 1, the pressure or temperature at that point is adjusted to make the blowing coefficient greater than 1.

[0047] This invention obtains the volumetric flow rate and density of air under blowdown conditions, as well as the air pressure and temperature under blowdown conditions, and calculates the air flow rate under blowdown conditions based on these values. Furthermore, it calculates the blowdown coefficient using the pressure-stabilized method by combining this with the air flow rate under the compressor's rated operating conditions. The invention also designs a method for calculating the air momentum at the calculation point under blowdown conditions, a method for calculating the air momentum at the calculation point under rated operating conditions, and a formula for calculating the blowdown coefficient. Simultaneously, the selection of blowdown parameters must ensure that the blowdown coefficient at all points in the purged system is greater than 1. During the blowdown process, necessary adjustments to the blowdown parameters should be made according to the actual situation. This invention fills the gap in the calculation method of the blowdown coefficient for compressed air energy storage power stations, providing a scientific basis for parameter control during the blowdown process of large-scale compressed air energy storage power stations. It is applicable to large-scale compressed air energy storage power stations using the pressure-stabilized method for blowdown, reducing the lifespan loss of pipeline components caused by blowdown.

[0048] like Figure 2 As shown, the present invention also provides a calculation device for the blowdown coefficient of the pressure stabilization method in a compressed air storage power station, comprising:

[0049] The acquisition module 1 is used to acquire the volumetric flow rate and density of air under the blowing operation condition, as well as the air pressure and air temperature under the blowing operation condition.

[0050] The first calculation module 2 is used to calculate the air flow rate under the blowing operation condition based on the volume flow rate and density of the air under the blowing operation condition, the air pressure under the blowing operation condition, and the air temperature under the blowing operation condition.

[0051] The second calculation module 3 is used to obtain the compressor's rated operating air flow rate and calculate the pressure stabilization method blowing coefficient based on the compressor's rated operating air flow rate, blowing air flow rate, blowing air pressure, and blowing air temperature.

[0052] In one embodiment, the calculation formula in the first calculation module 2 is:

[0053]

[0054] Among them, D b V represents the air flow rate under blowdown conditions, in t / h. b The volumetric airflow rate under blowdown conditions is expressed in m³. 3 / h; ρ0 represents the density of air under standard conditions, kg / m³ 3 ;P b T0 represents the air pressure under blowdown conditions, in Pa; T0 represents the temperature under standard conditions, in K; P0 represents the atmospheric pressure under standard conditions, in Pa; T b This indicates the air temperature during blowdown operation, in Kelvin (K).

[0055] In one embodiment, the air volumetric flow rate V during the blowdown operation b The flow rate was measured using the compressor manufacturer's own flow meter.

[0056] In one embodiment, the density of the air during the blowdown process is based on the air temperature T during the blowdown process. b and air pressure P b Perform corrective calculations.

[0057] In one embodiment, the rated operating air flow rate of the compressor is the rated operating flow rate designed for the compressor.

[0058] In one embodiment, the calculation formula in the second calculation module 3 is:

[0059]

[0060] Where K represents the blowdown coefficient applicable to the pressure stabilization method of a 300MW compressed air storage power station, and D... b D represents the airflow rate under blowdown conditions, in t / h. a The compressor's rated airflow rate is expressed in t / h; ρ0 represents the density of air under standard conditions, in kg / m³. 3 P0 represents standard atmospheric pressure, Pa; T0 represents standard temperature, K; P b Indicates the air pressure during blowdown operation, in Pa; T b This indicates the air temperature during blowdown operation, in Kelvin (K).

[0061] In one embodiment, if the blowing coefficient at a certain point is less than 1 during the actual blowing process, the pressure or temperature at that point is adjusted to make the blowing coefficient greater than 1.

[0062] The modules described above are used to perform the respective steps in the calculation method of the blowdown coefficient of the pressure stabilization method for compressed air storage power stations. The specific implementation methods are as described in the above method embodiments and will not be repeated here.

[0063] like Figure 3 As shown, the present invention also provides a computer device, which may be a server, and its internal structure may be as follows: Figure 3 As shown, the computer device includes a processor, memory, network interface, and database connected via a system bus. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and database. The internal memory provides the environment for the operation of the operating system and computer programs in the non-volatile storage media. The database stores all the data required for the calculation of the blowdown coefficient of the pressure stabilization method in a compressed air storage power station. The network interface is used for communication with external terminals via a network connection. When the processor executes the computer program, it implements the calculation method for the blowdown coefficient of the pressure stabilization method in a compressed air storage power station.

[0064] Those skilled in the art will understand that Figure 3 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer equipment on which the present application is applied.

[0065] An embodiment of this application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the calculation method for the blowdown coefficient of any of the above-mentioned compressed air storage power stations using the pressure stabilization method.

[0066] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media provided in this application and in the embodiments may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual-speed SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0067] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, apparatus, article, or method that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, apparatus, article, or method. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, apparatus, article, or method that includes that element.

[0068] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for calculating the blowdown coefficient of a compressed air storage power station using the pressure stabilization method, characterized in that, include: Obtain the volumetric flow rate and density of air under blowdown conditions, as well as the air pressure and temperature under blowdown conditions; The air flow rate under the blowdown condition is calculated based on the volumetric flow rate and density of the air, the air pressure under the blowdown condition, and the air temperature under the blowdown condition. Obtain the compressor's rated operating air flow rate, and calculate the pressure stabilization method blowing coefficient based on the compressor's rated operating air flow rate, blowing air flow rate, blowing air pressure, and blowing air temperature.

2. The method for calculating the blowdown coefficient of a compressed air storage power station using the pressure stabilization method according to claim 1, characterized in that, In the step of calculating the air flow rate under the blowdown condition based on the volumetric flow rate and density of the air, the air pressure under the blowdown condition, and the air temperature under the blowdown condition, the calculation formula is as follows: Among them, D b V represents the air flow rate under blowdown conditions, in t / h. b The volumetric airflow rate under blowdown conditions is expressed in m³. 3 / h; ρ0 represents the density of air under standard conditions, kg / m³ 3 ;P b T0 represents the air pressure under blowdown conditions, in Pa; T0 represents the temperature under standard conditions, in K; P0 represents the atmospheric pressure under standard conditions, in Pa; T b This indicates the air temperature during blowdown operation, in Kelvin (K).

3. The method for calculating the blowdown coefficient of a compressed air storage power station using the pressure stabilization method according to claim 2, characterized in that, The air volume flow rate V under the blowpipe operation condition b The flow rate was measured using the compressor manufacturer's own flow meter.

4. The method for calculating the blowdown coefficient of a compressed air storage power station using the pressure stabilization method according to claim 2, characterized in that, The density of the air during the blowdown operation is based on the air temperature T during the blowdown operation. b and air pressure P b Perform corrective calculations.

5. The method for calculating the blowdown coefficient of a compressed air storage power station using the pressure stabilization method according to claim 1, characterized in that, The rated airflow of the compressor is the rated airflow designed for the compressor.

6. The method for calculating the blowdown coefficient of a compressed air storage power station using the pressure stabilization method according to claim 2, characterized in that, In the step of obtaining the compressor's rated operating air flow rate and calculating the blow-through coefficient using the pressure stabilization method based on the compressor's rated operating air flow rate, blow-through air flow rate, blow-through air pressure, and blow-through air temperature, the calculation formula is as follows: Where K represents the blowdown coefficient applicable to the pressure stabilization method of a 300MW compressed air storage power station, and D... b D represents the airflow rate under blowdown conditions, in t / h. a The compressor's rated airflow rate is expressed in t / h; ρ0 represents the density of air under standard conditions, in kg / m³. 3 P0 represents standard atmospheric pressure, Pa; T0 represents standard temperature, K; P b Indicates the air pressure during blowdown operation, in Pa; T b This indicates the air temperature during blowdown operation, in Kelvin (K).

7. The method for calculating the blowdown coefficient of a compressed air storage power station using the pressure stabilization method according to claim 6, characterized in that, In actual blowing process, if the blowing coefficient at a certain point is less than 1, the pressure or temperature at that point is adjusted to make the blowing coefficient greater than 1.

8. A device for calculating the blowdown coefficient of a compressed air storage power station using the pressure stabilization method, characterized in that, include: The acquisition module is used to acquire the volumetric flow rate and density of air under the blowing operation condition, as well as the air pressure and air temperature under the blowing operation condition. The first calculation module is used to calculate the air flow rate under the blowing operation condition based on the volumetric flow rate and density of the air under the blowing operation condition, the air pressure under the blowing operation condition, and the air temperature under the blowing operation condition. The second calculation module is used to obtain the compressor's rated operating air flow rate and calculate the pressure stabilization method blowing coefficient based on the compressor's rated operating air flow rate, blowing air flow rate, blowing air pressure, and blowing air temperature.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 7.

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