Method and system for calculating high pressure bypass valve internal leakage flow

Abstract

The application provides a high-pressure bypass valve internal leakage flow calculation method, a high-pressure bypass valve internal leakage flow calculation system, an electronic device and a computer readable storage medium, and belongs to the technical field of high-pressure bypass valve internal leakage. The high-pressure bypass valve internal leakage flow calculation method comprises the following steps: according to the law of conservation of energy, an internal leakage heat equation of the high-pressure bypass valve is established for calculating the internal leakage heat E of the high-pressure bypass valve gp ; according to the internal leakage heat E of the high-pressure bypass valve gp and the internal leakage steam enthalpy h of the high-pressure bypass valve gpl , an internal leakage flow equation of the high-pressure bypass valve is established for calculating the internal leakage flow L of the high-pressure bypass valve gpl ; and the internal leakage heat equation of the high-pressure bypass valve and the internal leakage flow equation of the high-pressure bypass valve are solved to calculate the internal leakage flow of the high-pressure bypass valve. The high-pressure bypass valve internal leakage flow calculation method can accurately calculate the actual internal leakage flow of the high-pressure bypass valve.

Description

Technical Field

[0001] This invention relates to the field of internal leakage technology for high-pressure bypass valves in thermal power plants, specifically to a method for calculating the internal leakage flow of high-pressure bypass valves, a system for calculating the internal leakage flow of high-pressure bypass valves, an electronic device, and a computer-readable storage medium. Background Technology

[0002] Currently, many thermal power plants in my country experience leakage in high-pressure bypass valves (also known as internal leakage in high-pressure bypass valves). With continuous improvements in maintenance and installation techniques, the leakage is generally not severe (the desuperheating water in the high-pressure bypass valve is not automatically activated), falling under the category of minor leakage (minor internal leakage). However, it still has some impact on the unit's economic efficiency. Current mainstream technologies calculate the economic impact of high-pressure bypass valve internal leakage by assuming the leakage flow rate is 1% of the main steam flow rate. However, the estimated flow rate has a significant error compared to the actual leakage flow rate of the high-pressure bypass valve, making it impossible to accurately calculate the impact of high-pressure bypass valve leakage on the unit's economic efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a method for calculating the internal leakage flow of a high-pressure bypass valve, a system for calculating the internal leakage flow of a high-pressure bypass valve, an electronic device, and a computer-readable storage medium. The method for calculating the internal leakage flow of a high-pressure bypass valve can accurately calculate the actual internal leakage flow of the high-pressure bypass valve.

[0004] To achieve the above objectives, in a first aspect, the present invention provides a method for calculating the internal leakage flow of a high-pressure bypass valve, the method comprising the following steps:

[0005] According to the law of conservation of energy, the heat E from the exhaust steam of the high-pressure cylinder is utilized. ge Heat loss E of cold re-evaporation pipe lz And the steam heat E at the inlet of the reheater cold section zr An equation for the internal heat leakage of a high-pressure bypass valve is established, and the internal heat leakage E of the high-pressure bypass valve is calculated. gp :

[0006] E gp +E ge -E lz =E zr Formula 1;

[0007] Utilizing the internal heat leakage E of the high-pressure bypass valve gp and the internal leakage vapor enthalpy h of the high-pressure bypass valve gpl An equation for the internal leakage flow rate of the high-pressure bypass valve was established, and the internal leakage flow rate L of the high-pressure bypass valve was calculated. gpl :

[0008]

[0009] Preferably, the exhaust heat E of the high-pressure cylinder ge The calculation method is as follows:

[0010] Based on the exhaust temperature and pressure of the high-pressure cylinder, the exhaust enthalpy h of the high-pressure cylinder is calculated. ge ;

[0011] Through the main steam flow rate L of the steam turbine z The steam leakage flow rate L of the high-pressure cylinder valve stem mg Total steam extraction flow rate L of the high-pressure cylinder cq And the steam leakage flow rate L at the shaft end seal of the high-pressure cylinder zd The exhaust flow rate L of the high-pressure cylinder was calculated. ge :

[0012] L ge =L z -L mg -L cq -L zd Formula 3;

[0013] The exhaust enthalpy h of the high-pressure cylinder ge And exhaust steam flow rate L ge The heat of exhaust steam E from the high-pressure cylinder was calculated. ge :

[0014] E ge =h ge ×L ge Formula 4.

[0015] Preferably, the total steam extraction flow rate L of the high-pressure cylinder cq This includes the sum of the steam extraction flow rates of the multiple stages of the high-pressure cylinder.

[0016] Preferably, the steam heat E at the inlet of the cold section of the reheater zr The calculation method is as follows:

[0017] The enthalpy h of the reheater cold section inlet steam is calculated using the steam temperature and steam pressure at the reheater cold section inlet. zr ;

[0018] Utilizing the exhaust flow rate L of the high-pressure cylinder ge , High-pressure bypass valve internal leakage flow L gpl and the enthalpy h of the reheater cold section inlet steam. zr The steam heat equation at the reheater cold section inlet was established, and the steam heat E at the reheater cold section inlet was calculated. zr :

[0019] E zr =h zr ×(Lge +L gpl ) Formula 5.

[0020] Preferably, the heat loss E of the cold re-evaporation pipe lz The calculation method is as follows:

[0021] Under the condition that the unit is under the same load and there is no internal leakage flow in the high-pressure bypass valve, the exhaust flow rate L of the high-pressure cylinder is calculated. ge The exhaust enthalpy h of the high-pressure cylinder ge and the enthalpy h of the reheater cold section inlet steam. zr The heat loss E of the cold re-evaporation pipe was calculated. lz :

[0022] E lz =L ge ×(h ge -h zr ) Formula 6.

[0023] Preferably, the vapor enthalpy h of the high-pressure bypass valve is obtained. gpl Specifically:

[0024] The temperature and pressure of the high-pressure bypass valve are collected, and the vapor enthalpy h after leakage from the high-pressure bypass valve is calculated based on the temperature and pressure of the high-pressure bypass valve. gpl .

[0025] Preferably, when the high-pressure cylinder is a combined high- and medium-pressure cylinder unit, the exhaust flow rate L of the high-pressure cylinder is... ge The calculation equation is as follows:

[0026] L ge =L z -L mg -L cq -L zd -L gq Formula 7;

[0027] Among them, L ge This refers to the leakage flow rate of the steam seal at the middle bridge of the high-pressure cylinder unit.

[0028] Secondly, the present invention provides a high-pressure bypass valve internal leakage flow calculation system, comprising:

[0029] The data acquisition module is used to collect the exhaust temperature and pressure of the high-pressure cylinder and the main steam flow rate L of the steam turbine. z The steam leakage flow rate L of the high-pressure cylinder valve stem mg Total steam extraction flow rate L of the high-pressure cylinder cq And the steam leakage flow rate L at the shaft end seal of the high-pressure cylinder zd Temperature and pressure of the reheater cold section inlet steam and temperature and pressure of the high-pressure bypass valve;

[0030] The enthalpy calculation module is used to calculate the exhaust enthalpy h of the high-pressure cylinder based on the exhaust temperature and pressure. ge Used to calculate the enthalpy h of the reheater cold section inlet steam based on the temperature and pressure of the reheater cold section inlet steam. zr Used to calculate the vapor enthalpy h after internal leakage of the high-pressure bypass valve based on the temperature and pressure of the high-pressure bypass valve. gpl ;

[0031] The heat calculation module is used to calculate the exhaust enthalpy h of the high-pressure cylinder. ge Calculate the exhaust heat E of the high-pressure cylinder. ge Used to determine the exhaust enthalpy h of the high-pressure cylinder. ge and the enthalpy h of the reheater cold section inlet steam. zr Calculate the heat loss E of the cold re-evaporation pipe. lz Used to determine the enthalpy h of the reheater cold section inlet steam. zr Calculate the steam heat E at the cold section inlet of the reheater. zr ;

[0032] The flow calculation module is used to calculate the internal heat leakage E of the high-pressure bypass valve. gp and the vapor enthalpy h after leakage from the high-pressure bypass valve gpl Calculate the internal leakage flow rate L of the high-pressure bypass valve gpl .

[0033] Thirdly, the present invention provides a computer-readable storage medium storing computer instructions that, when executed on a computer, cause the computer to perform the method for calculating the internal leakage flow of a high-pressure bypass valve as described above.

[0034] Fourthly, the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method for calculating the internal leakage flow of a high-pressure bypass valve as described above.

[0035] This invention considers the heat loss of the cold resteam pipeline and uses the law of conservation of energy to treat the heat loss of the cold resteam pipeline as part of the heat of the high-pressure unit. This is used to calculate the internal leakage heat of the high-pressure bypass valve, making the calculated internal leakage heat of the high-pressure bypass valve more accurate. Furthermore, it makes the calculated internal leakage flow of the high-pressure bypass valve more accurate.

[0036] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0037] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0038] Figure 1 This is a flowchart of a method for calculating the internal leakage flow of a high-pressure bypass valve according to one embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the structure of a high-pressure cylinder provided in one embodiment of the present invention.

[0040] Explanation of reference numerals in the attached figures

[0041] 1-High-pressure cylinder, 2-First stage extraction steam, 3-First high-pressure heater, 4-Second stage extraction steam, 5-Second high-pressure heater, 6-High-pressure cylinder inlet steam, 7-Reheater cold section. Detailed Implementation

[0042] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0043] In actual thermal power plant generator systems, the length of the cold reheat pipe is very long, reaching 100m. Therefore, the heat loss dissipated by the cold reheat pipe should also be considered when calculating the heat leakage inside the high-pressure bypass valve.

[0044] Taking a coal-fired power generation unit as an example, data was selected during the period when the high-pressure bypass desuperheating water of the power generation unit was not automatically activated. The temperature after the high-pressure bypass valve was 482℃, and the temperature of the high-pressure cylinder exhaust was 304℃. The temperature after the high-pressure bypass valve was higher than the temperature of the high-pressure cylinder exhaust, so it was determined that the bypass valve had an internal leak. However, since the high-pressure bypass desuperheating water had not yet been activated, it was considered a minor internal leak in the high-pressure bypass valve.

[0045] Figure 1 This is a flowchart illustrating a method for calculating the internal leakage flow of a high-pressure bypass valve according to one embodiment of the present invention. In a first aspect, the present invention provides a method for calculating the internal leakage flow of a high-pressure bypass valve, the method comprising the following steps:

[0046] S1. According to the law of conservation of energy, utilize the heat E from the exhaust steam of high-pressure cylinder 1. ge Heat loss E of cold re-evaporation pipe lz And the steam heat E at the inlet of the cold section 7 of the reheater zr An equation for the internal heat leakage of a high-pressure bypass valve is established, and the internal heat leakage E of the high-pressure bypass valve is calculated. gp :

[0047] Egp +E ge -E lz =E zr Formula 1.

[0048] This invention takes into account the heat loss of the cold reheat steam pipeline and uses the law of conservation of energy to calculate the internal heat leakage of the high-pressure bypass valve, making the calculated internal heat leakage of the high-pressure bypass valve more accurate. Furthermore, it makes the calculated internal flow rate of the high-pressure bypass valve more accurate.

[0049] Specifically, in this embodiment, the exhaust heat E of the high-pressure cylinder 1 ge The calculation method is as follows:

[0050] Obtain the exhaust temperature and exhaust pressure of high-pressure cylinder 1, and calculate the exhaust enthalpy h of high-pressure cylinder 1. ge ;

[0051] Through the main steam flow rate L of the steam turbine z The steam leakage flow rate L of the valve stem of high-pressure cylinder 1 mg Total steam extraction flow rate L of high-pressure cylinder 1 cq And the steam leakage flow rate L at the shaft end seal of high-pressure cylinder 1 zd Calculate the exhaust flow rate L of high-pressure cylinder 1. ge The calculation equation is as follows:

[0052] L ge =L z -L mg -L cq -L zd Formula 3;

[0053] The exhaust enthalpy h of high-pressure cylinder 1 ge And exhaust steam flow rate L ge Calculate the exhaust heat E of high-pressure cylinder 1 ge The calculation formula is as follows:

[0054] E ge =h ge ×L ge Formula 4.

[0055] In this embodiment, the total steam extraction flow rate L of the high-pressure cylinder 1 cq This includes the sum of the steam extraction flows from multiple stages of high-pressure cylinder 1. Under normal circumstances, such as... Figure 2 As shown, the high-pressure cylinder 1 of the unit includes a first-stage extraction steam 2 and a second-stage extraction steam 4. The first-stage extraction steam 2 supplies the feedwater in the boiler to the No. 1 high-pressure heater 3, and the second-stage extraction steam 4 supplies the feedwater in the boiler to the No. 2 high-pressure heater 5. The total extraction steam flow rate L of the high-pressure cylinder 1 is calculated. cq At that time, it is necessary to calculate the sum of the flow rates of the first stage extraction steam 2 and the second stage extraction steam 4.

[0056] The flow rate of the extraction steam section 2 can be obtained from the heat balance equation of the first high-pressure heater 3, which is as follows:

[0057]

[0058] Among them, G fw For the final water supply flow rate, G e1 I is the extraction steam flow rate of high-pressure heater 3. 1Ho For the outlet enthalpy of high-pressure heater 3, I 1Hi For the inlet enthalpy of high-pressure heater 3, I 1Hs For the inlet steam enthalpy of high-pressure heater 3, I 1Hd This is the hydrophobic enthalpy of the No. 1 high-pressure heater 3.

[0059] The flow rate of the second-stage extraction steam 4 can be obtained from the heat balance equation of the second high-pressure heater 5, which is as follows:

[0060]

[0061] Among them, G fw For the final water supply flow rate, G e2 I is the extraction steam flow rate of the No. 2 high-pressure heater 5. 2Ho For the outlet enthalpy of high-pressure heater 5, I 2Hi For the inlet enthalpy of high-pressure heater 3, I 2Hs For the inlet steam enthalpy of the second high-pressure heater 5, I 2Hd G is the hydrophobic enthalpy of high-pressure heater 3. 1Hd I is the condensate flow rate of high-pressure heater 3. 1Hd This is the hydrophobic enthalpy of the No. 1 high-pressure heater 3.

[0062] In other embodiments of the present invention, if the high-pressure cylinder 1 is a combined high- and medium-pressure cylinder unit, the exhaust flow rate L of the high-pressure cylinder 1 is... ge The calculation equation is as follows:

[0063] L ge =L z -L mg -L cq -L zd -L gq Formula 7;

[0064] Among them, L ge This refers to the leakage flow rate of the steam seal at the middle bridge of the high-pressure cylinder unit.

[0065] In this embodiment, the steam heat E at the inlet of the cold section 7 of the reheater zr The calculation method is as follows:

[0066] Obtain the temperature and pressure of the inlet steam of reheater cold section 7, and calculate the enthalpy h of the inlet steam of reheater cold section 7. zr ;

[0067] According to the exhaust flow rate L of high-pressure cylinder 1 ge , High-pressure bypass valve internal leakage flow L gpl and the enthalpy h of the inlet steam of the cold section 7 of the reheater. zr Establish the heat equation for the inlet steam of reheater cold section 7, and solve for the heat E of the inlet steam of reheater cold section 7. zr The specific heat equation for the inlet steam of the cold section 7 of the reheater is as follows:

[0068] E zr =h zr ×(L ge +L gpl ) Formula 5.

[0069] In this embodiment, the heat loss E of the cold re-evaporation pipe lz The calculation method is as follows:

[0070] Under the condition that the unit is under the same load and there is no internal leakage flow in the high-pressure bypass valve, based on the exhaust flow rate L of high-pressure cylinder 1... ge The exhaust enthalpy h of high-pressure cylinder 1 ge and the enthalpy h of the inlet steam of the cold section 7 of the reheater. zr Calculate the heat loss E of the cold re-evaporation pipe. lz The calculation equation is as follows:

[0071] E lz =L ge ×(h ge -h zr ) Formula 6.

[0072] S2. Utilizing the internal heat leakage E of the high-pressure bypass valve gp and the internal leakage vapor enthalpy h of the high-pressure bypass valve gpl An equation for the internal leakage flow rate of the high-pressure bypass valve was established, and the internal leakage flow rate L of the high-pressure bypass valve was calculated. gpl :

[0073]

[0074] In this embodiment, the vapor enthalpy h of the high-pressure bypass valve is obtained. gpl Specifically:

[0075] The temperature and pressure of the high-pressure bypass valve are collected, and the vapor enthalpy h after leakage from the high-pressure bypass valve is calculated based on the temperature and pressure of the high-pressure bypass valve. gpl .

[0076] Temperature and pressure measuring points are installed after the high-pressure bypass valve in a thermal power plant. By collecting the temperature values ​​from the temperature measuring points and the pressure values ​​from the pressure measuring points, the steam enthalpy h of the high-pressure bypass valve can be obtained. gpl .

[0077] S3. Solve the equations 1 and 2 simultaneously to determine the internal leakage flow rate L of the high-pressure bypass valve. gpl .

[0078] Secondly, embodiments of the present invention provide a high-pressure bypass valve internal leakage flow calculation system, comprising:

[0079] The data acquisition module is used to collect the exhaust temperature and pressure of high-pressure cylinder 1, and the main steam flow rate L of the steam turbine. z The steam leakage flow rate L of the valve stem of high-pressure cylinder 1 mg Total steam extraction flow rate L of high-pressure cylinder 1 cq The steam leakage flow rate L at the shaft end seal of high-pressure cylinder 1 zd The steam temperature and pressure at the inlet of the cold section 7 of the reheater, as well as the temperature and pressure of the high-pressure bypass valve;

[0080] The enthalpy calculation module is used to calculate the exhaust enthalpy h of high-pressure cylinder 1 based on the exhaust temperature and exhaust pressure of high-pressure cylinder 1. ge Based on the steam temperature and pressure at the inlet of reheater cold section 7, calculate the enthalpy h of the steam at the inlet of reheater cold section 7. zr And calculate the internal leakage vapor enthalpy h of the high-pressure bypass valve based on the temperature and pressure of the high-pressure bypass valve. gpl ;

[0081] The heat calculation module is used to calculate the exhaust enthalpy h of the high-pressure cylinder 1. ge Calculate the exhaust heat E of high-pressure cylinder 1 ge According to the exhaust enthalpy h of high-pressure cylinder 1 ge and the enthalpy h of the inlet steam of the cold section 7 of the reheater. zr Calculate the heat loss E of the cold re-evaporation pipe. lz And based on the enthalpy h of the steam at the inlet of the cold section 7 of the reheater. zr Calculate the steam heat E at the inlet of the cold section 7 of the reheater. zr ;

[0082] The flow calculation module is used to calculate the internal heat leakage E of the high-pressure bypass valve. gp and the internal leakage vapor enthalpy h of the high-pressure bypass valve gpl Calculate the internal leakage flow rate L of the high-pressure bypass valve gpl .

[0083] Thirdly, embodiments of the present invention provide a computer-readable storage medium storing computer instructions, which, when executed on a computer, cause the computer to perform the high-pressure bypass valve internal leakage flow calculation method as described above.

[0084] Fourthly, embodiments of the present invention provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method for calculating the internal leakage flow of a high-pressure bypass valve as described above.

[0085] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0086] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details described above. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe the various possible combinations.

[0087] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the embodiments of the present invention, they should also be regarded as the content disclosed by the embodiments of the present invention.

Claims

1. A method for calculating the internal leakage flow of a high-pressure bypass valve, characterized in that, The method includes the following steps: According to the law of conservation of energy, the heat from the exhaust steam of the high-pressure cylinder is utilized. Heat loss of cold re-evaporation pipes And the steam heat at the inlet of the reheater cold section An equation for the internal heat leakage of a high-pressure bypass valve was established, and the internal heat leakage of the high-pressure bypass valve was calculated. : Formula 1; Utilizing the internal heat leakage of the high-pressure bypass valve and the internal leakage vapor enthalpy of the high-pressure bypass valve. An equation for the internal leakage flow rate of the high-pressure bypass valve was established, and the internal leakage flow rate of the high-pressure bypass valve was calculated. : Official 2; The method further includes: obtaining the total extraction steam flow rate of the high-pressure cylinder. The high-pressure cylinder comprises a first-stage steam extraction stage and a second-stage steam extraction stage, wherein the total steam extraction flow rate of the high-pressure cylinder is... This is the sum of the steam extraction flow rates of the multiple stages in the high-pressure cylinder, specifically the sum of the first stage steam extraction flow rate and the second stage steam extraction flow rate. The first stage steam extraction flow rate is calculated based on the heat balance equation of the No. 1 high-pressure heater, which is as follows: Formula 8; where, For the final water supply flow rate, This represents the extraction steam flow rate of the No. 1 high-pressure heater. The outlet enthalpy of the No. 1 high-pressure heater. The inlet enthalpy of the No. 1 high-pressure heater. This refers to the enthalpy of the steam entering the No. 1 high-pressure heater. The enthalpy of the condensate in the No. 1 high-pressure heater is given. The steam flow rate in the second stage is calculated based on the heat balance equation of the No. 2 high-pressure heater, which is as follows: Formula 9; where, This represents the extraction steam flow rate of the No. 2 high-pressure heater. This is the outlet enthalpy of the No. 2 high-pressure heater. The inlet enthalpy of the No. 2 high-pressure heater. This refers to the inlet enthalpy of the No. 2 high-pressure heater. The hydrophobic enthalpy of the No. 2 high-pressure heater. This represents the condensate flow rate of the No. 1 high-pressure heater.

2. The method for calculating the internal leakage flow of a high-pressure bypass valve according to claim 1, characterized in that, The exhaust heat of the high-pressure cylinder The calculation is as follows: The exhaust enthalpy of the high-pressure cylinder is calculated based on the exhaust temperature and pressure. ; Through the main steam flow of the steam turbine Steam leakage flow rate of the high-pressure cylinder valve stem Total steam extraction flow rate of the high-pressure cylinder And the steam leakage flow rate of the shaft end steam seal of the high-pressure cylinder. The exhaust flow rate of the high-pressure cylinder was calculated. : Official 3; The exhaust enthalpy of the high-pressure cylinder And exhaust steam flow The exhaust heat of the high-pressure cylinder was calculated. : Official 4.

3. The method for calculating the internal leakage flow of a high-pressure bypass valve according to claim 2, characterized in that, The heat of the steam at the cold section inlet of the reheater The calculation is as follows: The enthalpy of the steam at the reheater cold section inlet is calculated using the steam temperature and pressure at the reheater cold section inlet. ; Utilizing the exhaust flow of the high-pressure cylinder Internal leakage flow of high-pressure bypass valve and the enthalpy of the reheater cold section inlet steam. A heat equation for the reheater cold section inlet steam was established, and the heat of the reheater cold section inlet steam was calculated. : Official 5.

4. The method for calculating the internal leakage flow of a high-pressure bypass valve according to claim 3, characterized in that, Heat loss of the cold re-evaporation pipe The calculation is as follows: Under the condition that the unit is under the same load and there is no internal leakage flow in the high-pressure bypass valve, the exhaust flow rate of the high-pressure cylinder is used as a reference. Enthalpy of exhaust steam from the high-pressure cylinder and the enthalpy of the reheater cold section inlet steam. The heat loss of the cold re-evaporation pipe was calculated. : Official 6.

5. The method for calculating the internal leakage flow of a high-pressure bypass valve according to claim 1, characterized in that, The internal leakage vapor enthalpy of the high-pressure bypass valve The calculation is as follows: The internal leakage vapor enthalpy of the high-pressure bypass valve is calculated based on its temperature and pressure. .

6. A system for calculating the internal leakage flow of a high-pressure bypass valve, characterized in that, include: The data acquisition module is used to collect the exhaust temperature and pressure of the high-pressure cylinder and the main steam flow rate of the steam turbine. Steam leakage flow rate of the high-pressure cylinder valve stem Total steam extraction flow rate of the high-pressure cylinder Steam leakage flow rate at the shaft end seal of the high-pressure cylinder The steam temperature and pressure at the cold section inlet of the reheater, as well as the temperature and pressure of the high-pressure bypass valve; The enthalpy calculation module is used to calculate the exhaust enthalpy of the high-pressure cylinder based on its exhaust temperature and pressure. Calculate the enthalpy of the steam at the reheater cold section inlet based on the steam temperature and pressure at the reheater cold section inlet. And calculate the internal leakage vapor enthalpy of the high-pressure bypass valve based on the temperature and pressure of the high-pressure bypass valve. ; The heat calculation module is used to calculate the exhaust enthalpy value of the high-pressure cylinder. Calculate the exhaust heat of the high-pressure cylinder According to the exhaust enthalpy of the high-pressure cylinder and the enthalpy of the reheater cold section inlet steam. Calculate the heat loss of the cold re-evaporation pipe. And based on the enthalpy of the reheater cold section inlet steam. Calculate the heat of steam at the cold section inlet of the reheater. ; The flow calculation module is used to calculate the internal heat leakage of the high-pressure bypass valve. and the internal leakage vapor enthalpy of the high-pressure bypass valve. Calculate the internal leakage flow of the high-pressure bypass valve ; The high-pressure cylinder includes a first-stage steam extraction stage and a second-stage steam extraction stage, wherein the total steam extraction flow rate of the high-pressure cylinder is... This is the sum of the steam extraction flow rates of the multiple stages in the high-pressure cylinder, specifically the sum of the first stage steam extraction flow rate and the second stage steam extraction flow rate. The first stage steam extraction flow rate is calculated based on the heat balance equation of the No. 1 high-pressure heater, which is as follows: Formula 8; where, For the final water supply flow rate, This represents the extraction steam flow rate of the No. 1 high-pressure heater. The outlet enthalpy of the No. 1 high-pressure heater. The inlet enthalpy of the No. 1 high-pressure heater. This refers to the enthalpy of the steam entering the No. 1 high-pressure heater. The enthalpy of the condensate in the No. 1 high-pressure heater is given. The steam flow rate in the second stage is calculated based on the heat balance equation of the No. 2 high-pressure heater, which is as follows: Formula 9; where, This represents the extraction steam flow rate of the No. 2 high-pressure heater. This is the outlet enthalpy of the No. 2 high-pressure heater. The inlet enthalpy of the No. 2 high-pressure heater. This refers to the inlet enthalpy of the No. 2 high-pressure heater. The hydrophobic enthalpy of the No. 2 high-pressure heater. This represents the condensate flow rate of the No. 1 high-pressure heater.

7. A computer-readable storage medium storing computer instructions, characterized in that, When the computer instructions are executed on the computer, the computer performs the method for calculating the internal leakage flow of the high-pressure bypass valve as described in any one of claims 1-5.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method for calculating the internal leakage flow of the high-pressure bypass valve as described in any one of claims 1-5.

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