Method and device for evaluating minimum peak shaving output of industrial steam supply unit in reheating hot section

Abstract

This application provides a method and apparatus for evaluating the minimum peak-shaving output of a unit supplying industrial steam in its reheat section. The method includes: calculating the resistance characteristic function of the industrial steam supply pipeline in the reheat section based on the design operating condition outlet and inlet pressure ratio of the back-pressure turbine and the test operating data of the industrial steam supply system; calculating the minimum inlet pressure of the turbine's intermediate-pressure cylinder under a preset industrial steam supply flow rate based on the resistance characteristic function and the design operating condition outlet and inlet pressure ratio of the back-pressure turbine; calculating the minimum reheat steam flow rate under the preset industrial steam supply flow rate based on the minimum inlet pressure of the turbine's intermediate-pressure cylinder; calculating the unit output under the pure condensing reference operating condition based on the minimum reheat steam flow rate; and calculating the minimum peak-shaving output of the unit under the preset industrial steam supply flow rate based on the unit output under the pure condensing reference operating condition. This application can effectively evaluate the peak-shaving performance of heating units under complex industrial steam supply system configurations.

Description

Technical Field

[0001] This application relates to the field of heating unit technology, and in particular to a method and apparatus for evaluating the minimum peak-shaving output of a unit that supplies industrial steam in the reheat section. Background Technology

[0002] Currently, with the rapid development of energy units, increasingly higher demands are being placed on the peak-shaving capacity of existing thermal power units. For extraction-condensing heating units, especially under industrial steam supply conditions, the minimum peak-shaving output performance is not only directly related to the unit's operating parameters for external industrial steam supply, but also closely related to the specific configuration of the industrial steam supply system. Many heating units use the unit's reheat section for industrial steam supply pipelines and add back-pressure turbines to the pipelines. Because the back-pressure turbines have specific requirements for inlet and outlet steam parameters during operation, this has a significant impact on the unit's minimum peak-shaving output performance.

[0003] In the above situations, the relevant technologies usually adopt the peak-shaving characteristic curve of industrial steam supply provided by the turbine manufacturer, but there is often a large deviation when the actual computer group is at its minimum peak-shaving output. Summary of the Invention

[0004] This application provides a method and apparatus for evaluating the minimum peak-shaving output of a unit supplying industrial steam in the reheat hot section, in order to solve the problem of low accuracy of the industrial steam supply peak-shaving characteristic curves provided by turbine manufacturers in the prior art.

[0005] Firstly, this application provides a method for evaluating the minimum peak-shaving output of a unit supplying industrial steam in its reheat section, including:

[0006] Based on the unit's design operating data and the industrial steam supply system's test operating data, the resistance characteristic function of the reheat hot section's industrial steam supply pipeline is calculated; the unit's design operating data includes the design operating condition outlet and inlet pressure ratio of the back pressure turbine on the reheat hot section's industrial steam supply pipeline.

[0007] Based on the resistance characteristic function and the design operating condition outlet and inlet pressure ratio of the back-pressure turbine, the minimum inlet pressure of the intermediate-pressure cylinder of the turbine required under the preset industrial steam supply flow rate is calculated. Based on the minimum inlet pressure of the intermediate-pressure cylinder of the turbine required under the preset industrial steam supply flow rate, the minimum reheat steam flow rate under the preset industrial steam supply flow rate is calculated. The preset industrial steam supply flow rate is the industrial steam supply flow rate corresponding to any actual operating condition.

[0008] Based on the minimum reheat steam flow rate under the preset industrial steam supply flow rate, the unit output of the steam turbine under the pure condensing reference condition is calculated, and based on the unit output of the steam turbine under the pure condensing reference condition, the minimum peak-shaving output of the unit under the preset industrial steam supply flow rate is calculated.

[0009] Secondly, this application provides a device for evaluating the minimum peak-shaving output of a generator unit supplying industrial steam in the reheat section, comprising:

[0010] The function calculation module is used to calculate the resistance characteristic function of the reheat hot section industrial steam supply pipeline based on the unit's design operating condition data and the industrial steam supply system's test operating condition data. The unit's design operating condition data includes the design operating condition outlet and inlet pressure ratio of the back pressure turbine on the reheat hot section industrial steam supply pipeline.

[0011] The flow calculation module is used to calculate the minimum inlet pressure of the intermediate pressure cylinder of the turbine required under the preset industrial steam supply flow rate based on the resistance characteristic function and the design operating condition outlet and inlet pressure ratio of the back pressure turbine, and to calculate the minimum reheat steam flow rate under the preset industrial steam supply flow rate based on the minimum inlet pressure of the intermediate pressure cylinder of the turbine required under the preset industrial steam supply flow rate; the preset industrial steam supply flow rate is the industrial steam supply flow rate corresponding to any actual operating condition;

[0012] The output calculation module is used to calculate the unit output of the steam turbine under pure condensing reference conditions based on the minimum reheat steam flow rate under the preset industrial steam supply flow rate, and to calculate the minimum peak-shaving output of the unit under the preset industrial steam supply flow rate based on the unit output of the steam turbine under the pure condensing reference conditions.

[0013] Thirdly, this application provides a terminal 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 steps of the method as described in the first aspect or any possible implementation of the first aspect above.

[0014] Fourthly, this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method as described in the first aspect or any possible implementation of the first aspect.

[0015] This application provides a method and apparatus for evaluating the minimum peak-shaving output of a turbine unit supplying industrial steam in its reheat section. By combining the unit's design operating conditions and the industrial steam supply system's test operating conditions, a more accurate resistance characteristic function is obtained. Based on the resistance characteristic function, the minimum reheat steam flow rate under the preset industrial steam supply flow rate is calculated, and the turbine's output under pure condensing baseline operating conditions is calculated based on the minimum reheat steam flow rate under the preset industrial steam supply flow rate. This results in a more accurate minimum peak-shaving output of the unit corresponding to the preset industrial steam supply flow rate, solving the problem of low accuracy of the industrial steam supply peak-shaving characteristic curves provided by turbine manufacturers in the prior art. Furthermore, this application has simple on-site requirements, is easy to implement, and can effectively evaluate the peak-shaving operation performance of the unit under complex industrial steam supply system configurations. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural diagram of the unit provided in the embodiments of this application;

[0018] Figure 2 This is a flowchart illustrating the implementation of the minimum peak-shaving output assessment method for units supplying industrial steam in the reheat section, as provided in the embodiments of this application.

[0019] Figure 3 This is a schematic diagram of the structure of the unit minimum peak-shaving output evaluation device for reheat hot section supplying industrial steam provided in the embodiments of this application;

[0020] Figure 4 This is a schematic diagram of the terminal provided in the embodiments of this application. Detailed Implementation

[0021] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the following description will be provided in conjunction with the accompanying drawings and specific embodiments.

[0023] Figure 1 This is a structural diagram of the unit according to an embodiment of this application. The unit includes a boiler, a reheat section industrial steam supply pipeline, an industrial steam supply system, a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, an intermediate-pressure cylinder inlet steam regulating valve, and a low-pressure cylinder inlet steam regulating valve. The high-pressure cylinder is connected to the boiler. The boiler is connected to the intermediate-pressure cylinder and the pipeline system via the reheat section industrial steam supply pipeline. The intermediate-pressure cylinder is connected to the low-pressure cylinder. The steam source for the industrial steam supply system is provided by the reheat section industrial steam supply pipeline at the inlet of the intermediate-pressure cylinder of the turbine.

[0024] The industrial steam supply system is arranged in sequence with electric isolation valves, pressure reducing regulating valves, desuperheaters and back pressure steam turbines in the direction of industrial steam flow. The outlet of the back pressure steam turbine is connected to the external industrial steam supply header.

[0025] Figure 2The implementation flowchart of the minimum peak-shaving output assessment method for the reheat hot section of the unit supplying industrial steam, provided in the embodiments of this application, is detailed below:

[0026] In step 101, the resistance characteristic function of the reheat hot section industrial steam supply pipeline is calculated based on the unit design operating condition data and the industrial steam supply system test operating condition data. The unit design operating condition data includes the design operating condition outlet and inlet pressure ratio of the back pressure turbine on the reheat hot section industrial steam supply pipeline.

[0027] The unit design operating condition data refers to the operating data corresponding to the unit's design state, which is usually pure condensing operation. Pure condensing operation means that all the high and low pressure main steam generated by the boiler is used to do work in the high-pressure, intermediate-pressure, and low-pressure cylinders, without extracting steam to the heating pipeline system, and all the exhaust steam after doing work is condensed into water.

[0028] The test condition is the operating condition corresponding to a specific test industrial steam supply flow rate of the industrial steam supply system. This specific test industrial steam supply flow rate condition is set by the embodiments of this application, and there is no limitation on the setting value of this industrial steam supply flow rate.

[0029] In this embodiment, the design operating condition outlet and inlet pressure ratios of the back-pressure turbine on the reheat hot section industrial steam supply pipeline are obtained, along with the operating data of the industrial steam supply system under test conditions. The resistance characteristic function of the reheat hot section industrial steam supply pipeline is then calculated. This resistance characteristic function represents the resistance characteristics of the pipeline system on the reheat hot section industrial steam supply pipeline, excluding the back-pressure turbine.

[0030] In one possible implementation, the test operating data may include reheat hot section pressure, industrial steam supply flow rate, pressure reducing valve opening, back pressure turbine outlet industrial steam supply pressure, and industrial steam supply header pressure.

[0031] The test operating data refers to the operating data of the industrial steam supply system under a specific test industrial steam supply flow rate, which may include reheat hot section pressure, industrial steam supply flow rate, pressure reducing valve opening, back-pressure turbine outlet industrial steam supply pressure, and industrial steam supply header pressure. In this embodiment, the pressure reducing valve is fully open, and all operating data related to the back-pressure turbine in this application are obtained with the pressure reducing valve fully open.

[0032] In one possible implementation, calculating the resistance characteristic function of the reheat hot section supplying industrial steam pipeline can include:

[0033] By inputting the industrial steam supply pressure at the outlet of the back-pressure turbine under test conditions and the pressure ratio between the outlet and inlet of the back-pressure turbine under design conditions into the first formula, the pressure difference between the inlet and outlet of the back-pressure turbine under test conditions with the pressure reducing regulating valve fully open is obtained.

[0034] Input the inlet and outlet pressure difference of the back-pressure turbine under test conditions with the pressure reducing regulating valve fully open, the reheat hot section pressure under test conditions, and the industrial steam supply main pipe pressure under test conditions into the second formula to obtain the pipeline system resistance of the industrial steam supply pipeline under test conditions, excluding the back-pressure turbine.

[0035] The resistance characteristic function of the industrial steam supply pipeline in the reheat hot section under test conditions, excluding the back pressure turbine, is obtained by inputting the resistance characteristic function calculation formula of the pipeline system resistance and the industrial steam supply flow rate under test conditions.

[0036] The first formula is:

[0037]

[0038] Where, Δp TBPT p represents the inlet and outlet pressure difference of the back-pressure turbine under test conditions with the pressure reducing regulating valve fully open. OTBPT R is the industrial steam supply pressure at the outlet of the back-pressure steam turbine under test conditions. BPT The design operating condition outlet and inlet pressure ratio of the back-pressure steam turbine;

[0039] The second formula is:

[0040] Δp PT =p HRT -p ISHT -Δp TBPT

[0041] Where, Δp PT p represents the resistance of the piping system excluding the back-pressure turbine in the reheat hot section of the industrial steam supply pipeline under test conditions. HRT For the reheat hot section pressure under test conditions, p ISHT The industrial steam supply header pressure under test conditions;

[0042] The formula for calculating the drag characteristic function is:

[0043]

[0044] Where, Δp P To determine the resistance of the reheat hot section of the industrial steam supply pipeline, excluding the back pressure turbine, under the preset industrial steam supply flow rate, F IST For the industrial steam supply flow rate under test conditions, F IS Preset industrial steam supply flow rate.

[0045] In this application embodiment, the preset industrial steam supply flow rate is the industrial steam supply flow rate corresponding to any actual operating condition of the industrial steam supply system.

[0046] Based on the test conditions, the industrial steam supply pressure p at the outlet of the back-pressure steam turbine under test conditions is... OTBPT The design operating condition outlet and inlet pressure ratio R of the back pressure turbine BPT Input the first formula to calculate the inlet and outlet pressure difference Δp of the back-pressure turbine under test conditions with the pressure reducing regulating valve fully open. TBPT The inlet and outlet pressure difference Δp of the back-pressure turbine under test conditions with the pressure reducing regulating valve fully open was obtained. TBPT Then, the inlet and outlet pressure difference Δp of the back-pressure turbine with the pressure reducing regulating valve fully open is... TBPT Test operating conditions: reheat hot section pressure p HRT and the industrial steam supply header pressure p under test conditions ISHT Input the second formula to calculate the pipeline system resistance Δp, excluding the back-pressure turbine, on the reheat hot section of the industrial steam supply pipeline under test conditions. PT Finally, the resistance Δp of the piping system excluding the back-pressure turbine on the hot section of the industrial steam supply pipeline under test conditions was measured. PT Industrial steam supply flow rate F under test conditions IST Input the formula for calculating the resistance characteristic function, and calculate the resistance characteristic function Δp of the reheat hot section industrial steam supply pipeline, excluding the back pressure turbine. P .

[0047] In this embodiment, by combining the design operating condition outlet and inlet pressure ratio of the back-pressure turbine with the test operating condition data of the industrial steam supply system, the calculated resistance characteristic function of the reheat hot section supplying industrial steam pipeline is more accurate and can more accurately reflect the resistance characteristics of the reheat hot section supplying industrial steam pipeline of the industrial steam supply system.

[0048] In step 102, based on the resistance characteristic function and the design operating condition outlet and inlet pressure ratio of the back pressure turbine, the minimum inlet pressure of the turbine intermediate pressure cylinder required under the preset industrial steam supply flow rate is calculated, and based on the minimum inlet pressure of the turbine intermediate pressure cylinder required under the preset industrial steam supply flow rate, the minimum reheat steam flow rate under the preset industrial steam supply flow rate is calculated; the preset industrial steam supply flow rate is the industrial steam supply flow rate corresponding to any actual operating condition.

[0049] Among them, reference Figure 1 The minimum reheat steam flow rate under the preset industrial steam supply flow rate is the minimum reheat steam flow rate at the reheat hot section.

[0050] In this embodiment, any actual operating condition in the industrial steam supply system is obtained, and the industrial steam flow rate corresponding to this actual operating condition is defined as the preset industrial steam flow rate. Based on the resistance characteristic function calculated in step 101 and the design operating condition outlet and inlet pressure ratio of the back-pressure turbine obtained in step 101, the minimum inlet pressure of the turbine intermediate-pressure cylinder required under the preset industrial steam supply is calculated. Based on the minimum inlet pressure of the turbine intermediate-pressure cylinder required under the preset industrial steam supply flow rate, the minimum reheat steam flow rate under the preset industrial steam supply flow rate is calculated. The design operating condition data may also include the intermediate-pressure cylinder inlet flow rate and the intermediate-pressure cylinder inlet pressure under the design operating condition.

[0051] In one possible implementation, step 102 may include:

[0052] Obtain the set pressure of the industrial steam supply header under the actual operating conditions corresponding to the preset industrial steam supply flow rate, and input the design operating condition outlet and inlet pressure ratio of the back pressure turbine and the set pressure of the industrial steam supply header into the third formula to obtain the inlet and outlet pressure difference of the back pressure turbine under the preset industrial steam supply flow rate with the pressure reducing regulating valve fully open.

[0053] Input the preset industrial steam supply flow rate into the resistance characteristic function of the reheat hot section industrial steam supply pipeline to obtain the pipeline system resistance of the reheat hot section industrial steam supply pipeline excluding the back pressure turbine under the preset industrial steam supply flow rate.

[0054] The inlet and outlet pressure difference of the back pressure turbine under the preset industrial steam supply flow rate with the pressure reducing regulating valve fully open, the pipeline system resistance of the reheat hot section supplying industrial steam to the back pressure turbine under the preset industrial steam supply flow rate, and the set pressure of the industrial steam supply main pipe are input into the fourth formula to obtain the minimum inlet steam pressure of the intermediate pressure cylinder of the turbine required under the preset industrial steam supply flow rate.

[0055] Input the minimum inlet pressure of the intermediate-pressure cylinder of the turbine required under the preset industrial steam supply flow rate, the inlet flow rate of the intermediate-pressure cylinder under the design conditions, and the inlet pressure of the intermediate-pressure cylinder under the design conditions into the fifth formula to obtain the minimum reheat steam flow rate under the preset industrial steam supply flow rate.

[0056] The third formula is:

[0057]

[0058] Where, Δp TBP To determine the inlet and outlet pressure difference of the back-pressure turbine under the preset industrial steam supply flow rate with the pressure reducing regulating valve fully open, p ISHS To set the pressure of the industrial steam supply header under design conditions, R BPT The design operating condition outlet and inlet pressure ratio of the back-pressure steam turbine;

[0059] The fourth formula is:

[0060] p IPinmin =p ISHS +Δp TBP +Δp P0

[0061] Where, p IPinmin Δp is the minimum inlet pressure of the intermediate-pressure cylinder of the steam turbine required under the preset industrial steam supply flow rate. P0 The resistance of the pipeline system excluding the back pressure turbine in the reheat section of the industrial steam supply pipeline under the preset industrial steam supply flow rate;

[0062] The fifth formula is:

[0063]

[0064] Among them, E IPinmin F is the minimum reheat steam flow rate under the preset industrial steam supply flow rate. IPindes p represents the steam inlet flow rate of the intermediate-pressure cylinder under design conditions. IPindes This refers to the inlet steam pressure of the intermediate-pressure cylinder under design operating conditions.

[0065] Specifically, based on the preset industrial gas supply flow rate, the set pressure of the industrial steam supply header under the actual operating conditions corresponding to the preset industrial steam supply flow rate is obtained. The design operating condition outlet and inlet pressure ratio R of the back-pressure turbine is then calculated. BPT and industrial steam supply main pipe set pressure p ISHS Input the third formula to calculate the inlet and outlet pressure difference Δp of the back-pressure turbine with the pressure reducing regulating valve fully open under the preset industrial steam supply flow rate. TBP Then, the preset industrial steam supply flow rate F is... IS Input the resistance characteristic function of the reheat hot section industrial steam supply pipeline to obtain the pipeline system resistance Δp of the reheat hot section industrial steam supply pipeline excluding the back pressure turbine under the preset industrial steam supply flow rate. P The specific calculation refers to the formula for calculating the resistance characteristic function. Furthermore, the inlet and outlet pressure difference Δp of the back-pressure turbine with the pressure reducing regulating valve fully open under the preset industrial steam supply flow rate is calculated. TBP The resistance Δp of the reheat hot section industrial steam supply pipeline, excluding the back pressure turbine, under the preset industrial steam supply flow rate. P and industrial steam supply main pipe set pressure p ISHS Enter the fourth formula to calculate the minimum inlet steam pressure p required for the intermediate pressure cylinder of the steam turbine under the preset industrial steam supply flow rate. IPinmin Finally, the minimum inlet steam pressure p required for the intermediate pressure cylinder of the turbine under the preset industrial steam supply flow rate is determined. IPinmin , intermediate pressure cylinder inlet steam flow rate F under design conditions IPindes and the intermediate pressure cylinder inlet pressure p under design conditions IPindes Enter the fifth formula to calculate the minimum reheat steam flow rate F under the preset industrial steam supply flow rate. IPinmin.

[0066] In step 103, the turbine output under pure condensing reference conditions is calculated based on the minimum reheat steam flow rate under the preset industrial steam supply flow rate, and the minimum peak-shaving output corresponding to the turbine under the preset industrial steam supply flow rate is calculated based on the turbine output under the pure condensing reference conditions.

[0067] The unit includes the high-pressure cylinder, intermediate-pressure cylinder, and low-pressure cylinder of the steam turbine.

[0068] In this embodiment of the application, the pure condensing reference condition is one of the above-mentioned pure condensing operating states, namely the pure condensing condition of the unit corresponding to the minimum reheat steam flow rate.

[0069] In this embodiment, the turbine output under pure condensing reference conditions is calculated based on the minimum reheat steam flow rate under the preset industrial steam supply flow rate obtained in step 102. Based on the turbine output under pure condensing reference conditions, the minimum peak-shaving output corresponding to the preset industrial steam supply flow rate is calculated.

[0070] In one possible implementation, calculating the turbine output under pure condensing reference conditions based on the minimum reheat steam flow rate under a preset industrial steam supply flow rate may include:

[0071] Input the minimum reheat steam flow rate under the preset industrial steam supply flow rate and the preset industrial steam supply flow rate into the sixth formula to obtain the intermediate pressure cylinder steam inlet flow rate of the steam turbine under pure condensing reference conditions.

[0072] Input the intermediate-pressure cylinder inlet steam flow rate of the steam turbine under pure condensing reference conditions, the intermediate-pressure cylinder inlet steam flow rate under design conditions, and the unit output under design conditions into the seventh formula to obtain the unit output of the steam turbine under pure condensing reference conditions.

[0073] The sixth formula is:

[0074] F IPincon =F IPinmin +F IS

[0075] Among them, F IPincon F represents the steam inlet flow rate of the intermediate-pressure cylinder of the steam turbine under pure condensing reference conditions. IPinmin F is the minimum reheat steam flow rate under the preset industrial steam supply flow rate. IS Preset industrial steam supply flow rate;

[0076] The seventh formula is:

[0077]

[0078] Among them, P con For the unit output of the steam turbine under pure condensing reference conditions, Pdes For the unit's output under design conditions, F IPindes This refers to the steam inlet flow rate of the intermediate-pressure cylinder under design operating conditions.

[0079] Among them, the minimum reheat steam flow rate F under the preset industrial steam supply flow rate will be... IPinmin and preset industrial steam supply flow rate F IS Enter the sixth formula to calculate the steam inlet flow rate F of the intermediate-pressure cylinder of the steam turbine under pure condensing reference conditions. IPincon Then, obtain the unit output and intermediate-pressure cylinder inlet steam flow rate under design conditions, and calculate the intermediate-pressure cylinder inlet steam flow rate F of the turbine under pure condensing reference conditions. IPincon , intermediate pressure cylinder inlet steam flow rate F under design conditions IPindes Unit output P under design conditions des Enter the seventh formula to calculate the unit output P of the steam turbine under pure condensing reference conditions. con .

[0080] In one possible implementation, after calculating the turbine output under pure condensing reference conditions based on the minimum reheat steam flow rate at a preset industrial steam supply flow rate, the method may further include:

[0081] Input the preset industrial steam supply flow rate, the enthalpy of the medium-pressure cylinder inlet steam under design conditions, and the enthalpy of the low-pressure cylinder inlet steam under design conditions into the eighth formula to obtain the output correction amount of the medium and low-pressure cylinders caused by the preset industrial steam supply flow rate.

[0082] By inputting the intermediate-pressure cylinder inlet flow rate under pure condensing reference conditions, the intermediate-pressure cylinder inlet flow rate under design conditions, the intermediate-pressure cylinder inlet pressure under design conditions, and the pressure difference between the reheat cold section and the reheat hot section under design conditions into the ninth formula, the high-pressure cylinder exhaust pressure of the turbine under pure condensing reference conditions can be obtained.

[0083] By inputting the high-pressure cylinder exhaust pressure of the turbine under pure condensing reference conditions, the intermediate-pressure cylinder inlet flow rate of the turbine under pure condensing reference conditions, the high-pressure cylinder exhaust temperature under design conditions, and the high-pressure cylinder efficiency under design conditions into the tenth formula, the output correction amount of the high-pressure cylinder caused by the deviation of the high-pressure cylinder exhaust pressure is obtained.

[0084] The eighth formula is:

[0085] ΔP ISF =F IS ×(H IPindes -H LPexhdes )

[0086] Wherein, ΔP ISF H is the correction amount for the output of the medium and low pressure cylinders caused by the preset industrial steam supply flow rate. IPindes H represents the enthalpy of the steam entering the intermediate-pressure cylinder under design conditions. LPexhdesThis refers to the enthalpy of the low-pressure cylinder exhaust steam under design operating conditions.

[0087] The ninth formula is:

[0088]

[0089] Where, p HPexhcon p is the high-pressure cylinder exhaust pressure of the steam turbine under pure condensing reference conditions. IPindes Δp is the inlet steam pressure of the intermediate-pressure cylinder under design conditions. RHD The pressure difference between the reheat cold section and the reheat hot section under design conditions;

[0090] The tenth formula is:

[0091]

[0092] Wherein, ΔP HPexj The output correction amount of the high-pressure cylinder caused by the deviation in the exhaust pressure of the high-pressure cylinder, t HPexhdes p represents the high-pressure cylinder exhaust temperature under design conditions. HPexh To preset the high-pressure cylinder exhaust pressure under the industrial steam supply flow rate, η HP Let be the high-pressure cylinder efficiency under design conditions, h(p,t) be the steam-water characteristic function for solving the enthalpy of the medium based on the medium pressure and medium entropy, spt(p,t) be the steam-water characteristic function for solving the entropy of the medium based on the medium pressure and medium temperature, and h(p,s) be the steam-water characteristic function for solving the enthalpy of the medium based on the medium pressure and medium entropy.

[0093] Specifically, firstly, obtain the enthalpy value H of the intermediate-pressure cylinder inlet steam under design conditions. IPindes and the enthalpy H of the low-pressure cylinder inlet steam under design conditions LPexhdes And preset industrial steam supply flow rate F IS Enthalpy H of steam entering the intermediate pressure cylinder under design conditions IPindes and the enthalpy H of the low-pressure cylinder inlet steam under design conditions LPexhdes Enter formula number 8 to calculate the correction amount ΔP of the medium and low pressure cylinder output caused by the preset industrial steam supply flow rate. ISF .

[0094] Then, obtain the intermediate pressure cylinder inlet pressure p under the design conditions. IPindes The differential pressure Δp between the reheat cold section and the reheat hot section under design conditions RHD And the steam flow rate F of the intermediate pressure cylinder of the steam turbine under pure condensing reference conditions. IPincon , intermediate pressure cylinder inlet steam flow rate F under design conditions IPindes The intermediate pressure cylinder inlet pressure p under design conditions IPindes The differential pressure Δp between the reheat cold section and the reheat hot section under design conditions RHD Enter the ninth formula to calculate the high-pressure cylinder exhaust pressure p of the steam turbine under pure condensing reference conditions.HPexhcon .

[0095] Finally, the high-pressure cylinder exhaust temperature t under the design conditions is obtained. HPexhdes High-pressure cylinder efficiency η under design conditions HP And the high-pressure cylinder exhaust pressure p of the steam turbine under pure condensing reference conditions. HPexhcon The steam inlet flow rate F of the intermediate-pressure cylinder of the steam turbine under pure condensing reference conditions. IPincon High-pressure cylinder exhaust temperature t under design conditions HPexhdes High-pressure cylinder efficiency η under design conditions HP Enter the tenth formula to calculate the high-pressure cylinder output correction ΔP caused by the high-pressure cylinder exhaust pressure deviation. HPexh .

[0096] In one possible implementation, the corresponding minimum peak-shaving output of the computer unit under a preset industrial steam supply flow rate, based on the turbine's output under pure condensing reference conditions, may include:

[0097] Based on the turbine's output under pure condensing reference conditions, the output correction of the medium and low pressure cylinders caused by the preset industrial steam supply flow rate, and the output correction of the high pressure cylinder caused by the high pressure cylinder exhaust pressure deviation, the minimum peak-shaving output of the computer unit is calculated under the preset industrial steam supply flow rate.

[0098] Among them, the unit output P of the steam turbine under pure condensing reference conditions con The correction amount ΔP for the output of the medium and low pressure cylinders caused by the preset industrial steam supply flow rate. ISF The output correction amount ΔP of the high-pressure cylinder caused by the deviation in exhaust pressure of the high-pressure cylinder HPexh The minimum peak-shaving output of the computer group under the preset industrial steam supply flow rate.

[0099] Specifically, the minimum peak-shaving output of the computer group under the preset industrial steam supply flow rate is determined by formula eleven. Formula eleven is as follows:

[0100] P ISmin =P con +ΔP HPexh -ΔP ISF

[0101] Among them, P ISmin This refers to the minimum peak-shaving output of the unit under the preset industrial steam supply flow rate.

[0102] In one possible implementation, before obtaining the high-pressure cylinder exhaust pressure of the turbine under pure condensing reference conditions, the method may further include:

[0103] Input the intermediate-pressure cylinder inlet steam temperature under design conditions, the pressure difference between the reheat cold section and the reheat hot section under design conditions, the intermediate-pressure cylinder inlet steam flow rate under design conditions, the intermediate-pressure cylinder inlet steam pressure under design conditions, the minimum inlet steam pressure of the turbine intermediate-pressure cylinder required under the preset industrial steam supply flow rate, the minimum reheat steam flow rate under the preset industrial steam supply flow rate, and the preset industrial steam supply flow rate into the twelfth formula to obtain the pressure difference between the reheat cold section and the reheat hot section under the preset industrial steam supply flow rate.

[0104] Input the pressure difference between the reheat cold section and the reheat hot section under the preset industrial steam supply flow rate and the minimum steam inlet pressure of the intermediate pressure cylinder of the turbine required under the preset industrial steam supply flow rate into the thirteenth formula to obtain the exhaust pressure of the high pressure cylinder under the preset industrial steam supply flow rate.

[0105] The twelfth formula is:

[0106]

[0107] Where, Δp RH t is the pressure difference between the reheat cold section and the reheat hot section under the preset industrial steam supply flow rate. IPindes Let vpt(p,t) be the inlet steam temperature of the intermediate-pressure cylinder under design conditions, and vpt(p,t) be the steam-water characteristic function calculated based on the medium pressure and temperature to determine the specific volume of the medium. IPinmin The minimum inlet steam pressure of the intermediate pressure cylinder of the steam turbine is required under the preset industrial steam supply flow rate;

[0108] The thirteenth formula is:

[0109] p HPexh =p IPinmin +Δp RH

[0110] Where, p HPexh The high-pressure cylinder exhaust pressure is preset to the industrial steam supply flow rate.

[0111] Among them, the intermediate pressure cylinder inlet steam temperature t under design conditions is obtained. IPindes And the intermediate pressure cylinder inlet steam temperature t under design conditions IPindes The pressure difference Δp between the reheat cold section and the reheat hot section under design conditions. RHD , intermediate pressure cylinder inlet steam flow rate F under design conditions IPindes and the intermediate pressure cylinder inlet pressure p under design conditions IPindes And the minimum inlet steam pressure p required for the intermediate pressure cylinder of the turbine under the preset industrial steam supply flow rate obtained above. IPinmin Minimum reheat steam flow rate F under preset industrial steam supply flow rate IPinmin and preset industrial steam supply flow rate F IS Enter the twelfth formula to calculate the pressure difference Δp between the reheat cold section and the reheat hot section under the preset industrial steam supply flow rate. RHThe pressure difference Δp between the reheat cold section and the reheat hot section under the preset industrial steam supply flow rate. RH The minimum inlet steam pressure p required for the intermediate pressure cylinder of the turbine under the preset industrial steam supply flow rate. IPinmin Enter formula number thirteen to calculate the high-pressure cylinder exhaust pressure p under the preset industrial steam supply flow rate. HPexh .

[0112] This application provides a method for evaluating the minimum peak-shaving output of a turbine unit supplying industrial steam in its reheat section. By combining the unit's design operating conditions and the industrial steam supply system's test operating conditions, a more accurate resistance characteristic function is obtained. Based on the resistance characteristic function, the minimum reheat steam flow rate under the preset industrial steam supply flow rate is calculated. Then, based on the minimum reheat steam flow rate under the preset industrial steam supply flow rate, the turbine's output under the pure condensing baseline operating conditions is calculated. This yields a more accurate minimum peak-shaving output corresponding to the preset industrial steam supply flow rate, solving the problem of low accuracy of the industrial steam supply peak-shaving characteristic curves provided by turbine manufacturers in the prior art. Furthermore, this application has simple on-site requirements, is easy to implement, and can effectively evaluate the peak-shaving performance of the unit under complex industrial steam supply system configurations.

[0113] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0114] The following are device embodiments of this application. For details not described in detail, please refer to the corresponding method embodiments described above.

[0115] Figure 3 This paper illustrates a schematic diagram of the minimum peak-shaving output assessment device for a unit supplying industrial steam in the reheat section, as provided in an embodiment of this application. For ease of explanation, only the parts relevant to the embodiment of this application are shown, and are detailed below:

[0116] like Figure 3 As shown, the minimum peak-shaving output assessment device 3 for units supplying industrial steam in the reheat section includes:

[0117] The function calculation module 31 is used to calculate the resistance characteristic function of the reheat hot section industrial steam supply pipeline based on the unit design operating condition data and the industrial steam supply system test operating condition data; the unit design operating condition operating data includes the design operating condition outlet and inlet pressure ratio of the back pressure turbine on the reheat hot section industrial steam supply pipeline;

[0118] The flow calculation module 32 is used to calculate the minimum inlet pressure of the intermediate pressure cylinder of the turbine required under the preset industrial steam supply flow rate based on the resistance characteristic function and the outlet and inlet pressure ratio of the back pressure turbine under the design operating conditions, and to calculate the minimum reheat steam flow rate under the preset industrial steam supply flow rate based on the minimum inlet pressure of the intermediate pressure cylinder of the turbine under the preset industrial steam supply flow rate; the preset industrial steam supply flow rate is the industrial steam supply flow rate corresponding to any actual operating condition;

[0119] The output calculation module 33 is used to calculate the unit output of the steam turbine under pure condensing reference conditions based on the minimum reheat steam flow rate under the preset industrial steam supply flow rate, and to calculate the minimum peak-shaving output of the unit under the preset industrial steam supply flow rate based on the unit output of the steam turbine under the pure condensing reference conditions.

[0120] This application provides a device for evaluating the minimum peak-shaving output of a turbine unit supplying industrial steam in its reheat section. By combining the unit's design operating conditions with the industrial steam supply system's test operating conditions, a more accurate resistance characteristic function is obtained. Based on the resistance characteristic function, the minimum reheat steam flow rate under a preset industrial steam supply flow rate is calculated. Then, based on this minimum reheat steam flow rate, the turbine's output under pure condensing baseline operating conditions is calculated. This yields a more accurate minimum peak-shaving output corresponding to the preset industrial steam supply flow rate, solving the problem of low accuracy in the industrial steam supply peak-shaving characteristic curves provided by turbine manufacturers in existing technologies. Furthermore, this application has simple on-site requirements, is easy to implement, and can effectively evaluate the peak-shaving performance of the unit under complex industrial steam supply system configurations.

[0121] In one possible implementation, the test operating data may include reheat hot section pressure, industrial steam supply flow rate, pressure reducing valve opening, back pressure turbine outlet industrial steam supply pressure and industrial steam supply header pressure, with the pressure reducing valve fully open.

[0122] The function computation module can be used for:

[0123] By inputting the industrial steam supply pressure at the outlet of the back-pressure turbine under test conditions and the pressure ratio between the outlet and inlet of the back-pressure turbine under design conditions into the first formula, the pressure difference between the inlet and outlet of the back-pressure turbine under test conditions with the pressure reducing regulating valve fully open is obtained.

[0124] Input the inlet and outlet pressure difference of the back-pressure turbine under test conditions with the pressure reducing regulating valve fully open, the reheat hot section pressure under test conditions, and the industrial steam supply main pipe pressure under test conditions into the second formula to obtain the pipeline system resistance of the industrial steam supply pipeline under test conditions, excluding the back-pressure turbine.

[0125] The resistance characteristic function of the industrial steam supply pipeline in the reheat hot section under test conditions, excluding the back pressure turbine, is obtained by inputting the resistance characteristic function calculation formula of the pipeline system resistance and the industrial steam supply flow rate under test conditions.

[0126] The first formula is:

[0127]

[0128] Where, Δp TBPT p represents the inlet and outlet pressure difference of the back-pressure turbine under test conditions with the pressure reducing regulating valve fully open. OTBPT R is the industrial steam supply pressure at the outlet of the back-pressure steam turbine under test conditions. BPT The design operating condition outlet and inlet pressure ratio of the back-pressure steam turbine;

[0129] The second formula is:

[0130] Δp PT =p HRT -p ISHT -Δp TBPT

[0131] Where, Δp PT p represents the resistance of the piping system excluding the back-pressure turbine in the reheat hot section of the industrial steam supply pipeline under test conditions. HRT For the reheat hot section pressure under test conditions, p ISHT The industrial steam supply header pressure under test conditions;

[0132] The formula for calculating the drag characteristic function is:

[0133]

[0134] Where, Δp P To determine the resistance of the reheat hot section of the industrial steam supply pipeline, excluding the back pressure turbine, under the preset industrial steam supply flow rate, F IST For the industrial steam supply flow rate under test conditions, F IS Preset industrial steam supply flow rate.

[0135] In one possible implementation, the unit's design operating condition data may include the intermediate pressure cylinder inlet steam flow rate and the intermediate pressure cylinder inlet steam pressure under the design conditions.

[0136] The flow calculation module can be used for:

[0137] Obtain the set pressure of the industrial steam supply header under the actual operating conditions corresponding to the preset industrial steam supply flow rate, and input the design operating condition outlet and inlet pressure ratio of the back pressure turbine and the set pressure of the industrial steam supply header into the third formula to obtain the inlet and outlet pressure difference of the back pressure turbine under the preset industrial steam supply flow rate with the pressure reducing regulating valve fully open.

[0138] Input the preset industrial steam supply flow rate into the resistance characteristic function of the reheat hot section industrial steam supply pipeline to obtain the pipeline system resistance of the reheat hot section industrial steam supply pipeline excluding the back pressure turbine under the preset industrial steam supply flow rate.

[0139] The inlet and outlet pressure difference of the back pressure turbine under the preset industrial steam supply flow rate with the pressure reducing regulating valve fully open, the pipeline system resistance of the reheat hot section supplying industrial steam to the back pressure turbine under the preset industrial steam supply flow rate, and the set pressure of the industrial steam supply main pipe are input into the fourth formula to obtain the minimum inlet steam pressure of the intermediate pressure cylinder of the turbine required under the preset industrial steam supply flow rate.

[0140] Input the minimum inlet pressure of the intermediate pressure cylinder of the turbine required under the preset industrial steam supply flow rate, the inlet flow rate of the intermediate pressure cylinder under the design conditions, and the inlet pressure of the intermediate pressure cylinder under the design conditions into the fifth formula to obtain the minimum reheat steam flow rate under the preset industrial steam supply flow rate.

[0141] The third formula is:

[0142]

[0143] Where, Δp TBP To determine the inlet and outlet pressure difference of the back-pressure turbine under the preset industrial steam supply flow rate with the pressure reducing regulating valve fully open, p ISHS To set the pressure for the industrial steam supply header, R BPT The design operating condition outlet and inlet pressure ratio of the back-pressure steam turbine;

[0144] The fourth formula is:

[0145] p IPinmin = ISHS +Δp TBP +Δp P

[0146] Where, p IPinmin Δp is the minimum inlet pressure of the intermediate-pressure cylinder of the steam turbine required under the preset industrial steam supply flow rate. P The resistance of the pipeline system excluding the back pressure turbine in the reheat section of the industrial steam supply pipeline under the preset industrial steam supply flow rate;

[0147] The fifth formula is:

[0148]

[0149] Among them, F IPinmin F is the minimum reheat steam flow rate under the preset industrial steam supply flow rate. IPindes p represents the steam inlet flow rate of the intermediate-pressure cylinder under design conditions. IPindes This refers to the inlet steam pressure of the intermediate-pressure cylinder under design operating conditions.

[0150] In one possible implementation, the unit design operating condition data may include the unit output under design conditions and the intermediate pressure cylinder inlet steam flow under design conditions.

[0151] The output calculation module can be used for:

[0152] Input the minimum reheat steam flow rate under the preset industrial steam supply flow rate and the preset industrial steam supply flow rate into the sixth formula to obtain the intermediate pressure cylinder steam inlet flow rate of the steam turbine under pure condensing reference conditions.

[0153] Input the intermediate-pressure cylinder inlet steam flow rate of the steam turbine under pure condensing reference conditions, the intermediate-pressure cylinder inlet steam flow rate under design conditions, and the unit output under design conditions into the seventh formula to obtain the unit output of the steam turbine under pure condensing reference conditions.

[0154] The sixth formula is:

[0155] F IPincon =F IPinmin +F IS

[0156] Among them, F IPincon F represents the steam inlet flow rate of the intermediate-pressure cylinder of the steam turbine under pure condensing reference conditions. IPinmin F is the minimum reheat steam flow rate under the preset industrial steam supply flow rate. IS Preset industrial steam supply flow rate;

[0157] The seventh formula is:

[0158]

[0159] Among them, P con For the unit output of the steam turbine under pure condensing reference conditions, P des For the unit's output under design conditions, F IPindes This refers to the steam inlet flow rate of the intermediate-pressure cylinder under design operating conditions.

[0160] In one possible implementation, the unit's design operating data may include the enthalpy of the intermediate-pressure cylinder inlet steam under design conditions, the enthalpy of the low-pressure cylinder inlet steam under design conditions, the intermediate-pressure cylinder inlet steam pressure under design conditions, the pressure difference between the reheat cold section and the reheat hot section under design conditions, the high-pressure cylinder exhaust temperature under design conditions, and the high-pressure cylinder efficiency under design conditions.

[0161] Following the output calculation module, the device may further include:

[0162] The first correction calculation module is used to input the preset industrial steam supply flow rate, the enthalpy value of the medium-pressure cylinder inlet steam under the design conditions, and the enthalpy value of the low-pressure cylinder inlet steam under the design conditions into the eighth formula to obtain the correction amount of the medium and low-pressure cylinder output caused by the preset industrial steam supply flow rate.

[0163] The pure condensing reference operating condition pressure calculation module is used to input the intermediate pressure cylinder inlet flow rate, the intermediate pressure cylinder inlet flow rate under the design condition, the intermediate pressure cylinder inlet pressure under the design condition, and the pressure difference between the reheat cold section and the reheat hot section under the design condition into the ninth formula to obtain the high pressure cylinder exhaust pressure of the turbine under the pure condensing reference operating condition.

[0164] The second correction calculation module is used to input the high-pressure cylinder exhaust pressure of the steam turbine under pure condensing reference conditions, the intermediate-pressure cylinder inlet flow rate of the steam turbine under pure condensing reference conditions, the high-pressure cylinder exhaust temperature under design conditions, and the high-pressure cylinder efficiency under design conditions into the tenth formula to obtain the high-pressure cylinder output correction amount caused by the high-pressure cylinder exhaust pressure deviation.

[0165] The eighth formula is:

[0166] ΔP ISF =F IS ×(H IPindes -H LPexhdes )

[0167] Wherein, ΔP ISF H is the correction amount for the output of the medium and low pressure cylinders caused by the preset industrial steam supply flow rate. IPindes H represents the enthalpy of the steam entering the intermediate-pressure cylinder under design conditions. LPexhdes This refers to the enthalpy of the low-pressure cylinder exhaust steam under design operating conditions.

[0168] The ninth formula is:

[0169]

[0170] Where, p HPexhcon p is the high-pressure cylinder exhaust pressure of the steam turbine under pure condensing reference conditions. IPindes Δp is the inlet steam pressure of the intermediate-pressure cylinder under design conditions. RHD The pressure difference between the reheat cold section and the reheat hot section under design conditions;

[0171] The tenth formula is:

[0172]

[0173] Wherein, ΔP HPexh The output correction amount of the high-pressure cylinder caused by the deviation in the exhaust pressure of the high-pressure cylinder, t HPexhdes p represents the high-pressure cylinder exhaust temperature under design conditions. HPexh To preset the high-pressure cylinder exhaust pressure under the industrial steam supply flow rate, η HPFor the high-pressure cylinder efficiency under design conditions, hpt(p,t) is the steam-water characteristic function for solving the enthalpy of the medium based on the medium pressure and medium entropy value, spt(p,t) is the steam-water characteristic function for solving the medium entropy value based on the medium pressure and medium temperature, and hps(p,s) is the steam-water characteristic function for solving the enthalpy of the medium based on the medium pressure and medium entropy value.

[0174] Correspondingly, the output calculation module can also be used for:

[0175] Based on the turbine's output under pure condensing reference conditions, the output correction of the medium and low pressure cylinders caused by the preset industrial steam supply flow rate, and the output correction of the high pressure cylinder caused by the high pressure cylinder exhaust pressure deviation, the minimum peak-shaving output of the computer unit is calculated under the preset industrial steam supply flow rate.

[0176] In one possible implementation, the unit output can be used for:

[0177] The eleventh formula determines the minimum peak-shaving output of the computer group under the preset industrial steam supply flow rate. The eleventh formula is as follows:

[0178] P ISmin =P con +ΔP HPexh -ΔP ISF

[0179] Among them, P ISmin This refers to the minimum peak-shaving output of the unit under the preset industrial steam supply flow rate.

[0180] In one possible implementation, the unit's design operating condition data may include the intermediate pressure cylinder inlet steam temperature under design conditions;

[0181] Prior to the pure condensation reference pressure calculation module, the device may also include:

[0182] The differential pressure calculation module is used to input the intermediate pressure cylinder inlet steam temperature under design conditions, the differential pressure between the reheat cold section and the reheat hot section under design conditions, the intermediate pressure cylinder inlet steam flow rate under design conditions, the intermediate pressure cylinder inlet steam pressure under design conditions, the minimum inlet steam pressure of the turbine intermediate pressure cylinder required under the preset industrial steam supply flow rate, the minimum reheat steam flow rate under the preset industrial steam supply flow rate, and the preset industrial steam supply flow rate into the twelfth formula to obtain the differential pressure between the reheat cold section and the reheat hot section under the preset industrial steam supply flow rate.

[0183] The high-pressure cylinder exhaust pressure calculation module is used to input the pressure difference between the reheat cold section and the reheat hot section under the preset industrial steam supply flow rate and the minimum steam inlet pressure of the intermediate pressure cylinder of the turbine required under the preset industrial steam supply flow rate into the thirteenth formula to obtain the high-pressure cylinder exhaust pressure under the preset industrial steam supply flow rate.

[0184] The twelfth formula is:

[0185]

[0186] Where, Δp RH t is the pressure difference between the reheat cold section and the reheat hot section under the preset industrial steam supply flow rate. IPindes Let vpt(p,t) be the inlet steam temperature of the intermediate-pressure cylinder under design conditions, and vpt(p,t) be the steam-water characteristic function calculated based on the medium pressure and temperature to determine the specific volume of the medium. IPinmin The minimum inlet steam pressure of the intermediate pressure cylinder of the steam turbine is required under the preset industrial steam supply flow rate;

[0187] The thirteenth formula is:

[0188] p HPexh =p IPinmin +Δp RH

[0189] Where, p HPexh The high-pressure cylinder exhaust pressure is preset to the industrial steam supply flow rate.

[0190] Figure 4 This is a schematic diagram of the terminal provided in an embodiment of this application. For example... Figure 4 As shown, the terminal 4 in this embodiment includes: a processor 40, a memory 41, and a computer program 42 stored in the memory 41 and executable on the processor 40. When the processor 40 executes the computer program 42, it implements the steps in the embodiments of the minimum peak-shaving output assessment method for the reheat hot zone supplying industrial steam, for example... Figure 2 Steps 101 to 103 are shown. Alternatively, when the processor 40 executes the computer program 42, it implements the functions of each module in the above-described device embodiments, for example... Figure 3 The functions of each module are shown.

[0191] For example, the computer program 42 can be divided into one or more modules, which are stored in the memory 41 and executed by the processor 40 to complete this application. The one or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program 42 in the terminal 4. For example, the computer program 42 can be divided into... Figure 3 The modules shown.

[0192] The terminal 4 can be a computing device such as a desktop computer, laptop, handheld computer, or cloud server. The terminal 4 may include, but is not limited to, a processor 40 and a memory 41. Those skilled in the art will understand that... Figure 4This is merely an example of terminal 4 and does not constitute a limitation on terminal 4. It may include more or fewer components than shown, or combine certain components, or different components. For example, the terminal may also include input / output devices, network access devices, buses, etc.

[0193] The processor 40 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0194] The memory 41 can be an internal storage unit of the terminal 4, such as a hard disk or memory of the terminal 4. The memory 41 can also be an external storage device of the terminal 4, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card equipped on the terminal 4. Furthermore, the memory 41 can include both internal storage units and external storage devices of the terminal 4. The memory 41 is used to store the computer program and other programs and data required by the terminal. The memory 41 can also be used to temporarily store data that has been output or will be output.

[0195] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0196] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0197] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0198] In the embodiments provided in this application, it should be understood that the disclosed devices / terminals and methods can be implemented in other ways. For example, the device / terminal embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0199] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0200] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0201] If the integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above-described embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the steps of the above-described embodiments of the method for evaluating the minimum peak-shaving output of units supplying industrial steam in various reheat sections. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc. It should be noted that the content contained in the computer-readable medium may be appropriately added to or subtracted from the content as required by the legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium may not include electrical carrier signals and telecommunication signals.

[0202] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A method for evaluating the minimum peak-shaving output of a generator unit supplying industrial steam via a reheat section, characterized in that, include: Based on the unit's design operating data and the industrial steam supply system's test operating data, the resistance characteristic function of the reheat hot section's industrial steam supply pipeline is calculated. The unit's design operating data includes the design operating outlet and inlet pressure ratio of the back-pressure turbine on the reheat hot section's industrial steam supply pipeline. Based on the resistance characteristic function and the design operating outlet and inlet pressure ratio of the back-pressure turbine, the minimum inlet pressure of the turbine's intermediate-pressure cylinder required under the preset industrial steam supply flow rate is calculated. Based on the minimum inlet pressure of the turbine's intermediate-pressure cylinder required under the preset industrial steam supply flow rate, the minimum reheat steam flow rate under the preset industrial steam supply flow rate is calculated. The preset industrial steam supply flow rate is the industrial steam supply flow rate corresponding to any actual operating condition. Based on the minimum reheat steam flow rate under the preset industrial steam supply flow rate, calculate the unit output of the steam turbine under the pure condensing reference condition, and based on the unit output of the steam turbine under the pure condensing reference condition, calculate the minimum peak-shaving output of the unit under the preset industrial steam supply flow rate. The step of determining the minimum peak-shaving output of the computer unit under a preset industrial steam supply flow rate, based on the turbine's output under pure condensing reference conditions, includes: Based on the turbine output under the pure condensing reference condition, the output correction of the medium and low pressure cylinders caused by the preset industrial steam supply flow rate, and the output correction of the high pressure cylinder caused by the high pressure cylinder exhaust pressure deviation, the minimum peak-shaving output of the unit under the preset industrial steam supply flow rate is calculated; wherein, the pure condensing reference condition is a type of pure condensing operation state, in which all the high and low pressure main steam generated by the boiler is used to do work in the high pressure cylinder, medium pressure cylinder, and low pressure cylinder, without extracting steam to the heating pipeline system, and all the exhaust steam after doing work is condensed into water.

2. The method for evaluating the minimum peak-shaving output of a unit supplying industrial steam in the reheat section according to claim 1, characterized in that, The test operating data includes reheat hot section pressure, industrial steam supply flow rate, pressure reducing regulating valve opening, back pressure turbine outlet industrial steam supply pressure, and industrial steam supply header pressure. The pressure reducing regulating valve is in the fully open state. The function for calculating the resistance characteristic of the reheat hot section of the industrial steam supply pipeline includes: The industrial steam supply pressure at the outlet of the back-pressure turbine under test conditions and the pressure ratio between the outlet and inlet of the back-pressure turbine under design conditions are input into the first formula to obtain the inlet and outlet pressure difference of the back-pressure turbine under test conditions with the pressure reducing regulating valve fully open. Input the inlet and outlet pressure difference of the back-pressure turbine under the test condition with the pressure reducing regulating valve fully open, the reheat hot section pressure under the test condition, and the industrial steam supply main pipe pressure under the test condition into the second formula to obtain the pipeline system resistance of the industrial steam supply pipeline under the test condition, excluding the back-pressure turbine. The resistance characteristic function of the reheat hot section industrial steam supply pipeline excluding the back pressure turbine is obtained by calculating the pipeline system resistance of the industrial steam supply pipeline under the test conditions and the input resistance characteristic function of the industrial steam supply flow under the test conditions. The first formula is: in, The pressure difference between the inlet and outlet of the back-pressure turbine under the test condition with the pressure reducing regulating valve fully open. The back-pressure turbine outlet industrial steam supply pressure under the aforementioned test conditions. The design operating condition outlet and inlet pressure ratio of the back-pressure turbine; The second formula is: in, The resistance of the piping system excluding the back-pressure turbine on the reheat hot section of the industrial steam supply pipeline under the test conditions. The reheat hot section pressure under the test conditions, The industrial steam supply main pipe pressure under the test conditions; The formula for calculating the resistance characteristic function is as follows: wherein, is the resistance of the industrial steam supply pipeline except the back pressure steam turbine under the preset industrial steam supply flow rate, is the industrial steam supply flow rate of the test working condition, is the preset industrial steam supply flow rate.

3. The method of claim 1, wherein the minimum peak shaving output of the industrial steam supply unit is evaluated based on the reheat heat section. The unit's design operating data includes the intermediate pressure cylinder inlet steam flow rate and the intermediate pressure cylinder inlet steam pressure under the design conditions. The calculation of the minimum inlet pressure of the intermediate-pressure cylinder of the turbine under the preset industrial steam supply flow rate, based on the drag characteristic function and the outlet-to-inlet pressure ratio of the back-pressure turbine under the design operating conditions, and the calculation of the minimum reheat steam flow rate under the preset industrial steam supply flow rate based on the minimum inlet pressure of the intermediate-pressure cylinder of the turbine under the preset industrial steam supply flow rate, includes: Obtain the industrial steam supply header set pressure under the actual operating conditions corresponding to the preset industrial steam supply flow rate, and input the design operating condition outlet-inlet pressure ratio of the back pressure turbine and the industrial steam supply header set pressure into the third formula to obtain the inlet and outlet pressure difference of the back pressure turbine under the preset industrial steam supply flow rate with the pressure reducing regulating valve fully open. The preset industrial steam supply flow rate is input into the resistance characteristic function of the reheat hot section industrial steam supply pipeline to obtain the pipeline system resistance of the reheat hot section industrial steam supply pipeline excluding the back pressure turbine under the preset industrial steam supply flow rate. The inlet and outlet pressure difference of the back pressure turbine under the preset industrial steam supply flow rate with the pressure reducing regulating valve fully open, the pipeline system resistance of the reheat hot section industrial steam supply pipeline excluding the back pressure turbine under the preset industrial steam supply flow rate, and the set pressure of the industrial steam supply main pipe are input into the fourth formula to obtain the minimum inlet steam pressure of the turbine intermediate pressure cylinder required under the preset industrial steam supply flow rate. Input the minimum inlet pressure of the intermediate pressure cylinder of the turbine required under the preset industrial steam supply flow rate, the inlet flow rate of the intermediate pressure cylinder under the design conditions, and the inlet pressure of the intermediate pressure cylinder under the design conditions into the fifth formula to obtain the minimum reheat steam flow rate under the preset industrial steam supply flow rate. The third formula is as follows: in, The inlet and outlet pressure difference of the back-pressure turbine under the preset industrial steam supply flow rate with the pressure reducing regulating valve fully open. Set the pressure for the industrial steam supply header. The design operating condition outlet and inlet pressure ratio of the back-pressure turbine; The fourth formula is: in, The minimum inlet steam pressure of the intermediate pressure cylinder of the steam turbine required under the preset industrial steam supply flow rate. The resistance of the pipeline system excluding the back pressure turbine in the reheat section of the industrial steam supply pipeline under the preset industrial steam supply flow rate; The fifth formula is: wherein, is the minimum reheat steam flow rate under the preset industrial steam supply flow rate, is the MP cylinder inlet steam flow rate under the design condition, is the MP cylinder inlet steam pressure under the design condition.

4. The method of claim 1, wherein the minimum peak shaving output of the industrial steam supply unit is evaluated based on the reheat heat section. The unit's design operating data includes the unit's output under design conditions and the steam inlet flow rate of the intermediate pressure cylinder under design conditions. The calculation of the turbine output under pure condensing reference conditions based on the minimum reheat steam flow rate under the preset industrial steam supply flow rate includes: Input the minimum reheat steam flow rate under the preset industrial steam supply flow rate and the preset industrial steam supply flow rate into the sixth formula to obtain the intermediate pressure cylinder steam inlet flow rate of the steam turbine under pure condensing reference conditions. By inputting the intermediate-pressure cylinder inlet steam flow rate of the turbine under pure condensing reference conditions, the intermediate-pressure cylinder inlet steam flow rate under the design conditions, and the unit output under the design conditions into the seventh formula, the unit output of the turbine under pure condensing reference conditions can be obtained. The sixth formula is as follows: in, The steam inlet flow rate of the intermediate-pressure cylinder of the steam turbine under pure condensing reference conditions is given. The minimum reheat steam flow rate under the preset industrial steam supply flow rate. The preset industrial steam supply flow rate; The seventh formula is: in, This refers to the unit output of the steam turbine under pure condensing reference conditions. For the unit output under the aforementioned design operating conditions, The steam flow rate at the inlet of the intermediate-pressure cylinder is given under the aforementioned design conditions.

5. The method of claim 4, wherein the minimum peak shaving output of the industrial steam supply unit is evaluated based on the reheat heat section. The unit's design operating data includes the enthalpy of the intermediate-pressure cylinder inlet steam, the enthalpy of the low-pressure cylinder inlet steam, the intermediate-pressure cylinder inlet steam pressure, the pressure difference between the reheat cold section and the reheat hot section, the high-pressure cylinder exhaust temperature, and the high-pressure cylinder efficiency under the design conditions. After calculating the turbine output under pure condensing reference conditions based on the minimum reheat steam flow rate under a preset industrial steam supply flow rate, the method further includes: Input the preset industrial steam supply flow rate, the enthalpy value of the medium-pressure cylinder inlet steam under the design conditions, and the enthalpy value of the low-pressure cylinder inlet steam under the design conditions into the eighth formula to obtain the output correction amount of the medium and low-pressure cylinders caused by the preset industrial steam supply flow rate. By inputting the intermediate-pressure cylinder inlet steam flow rate of the turbine under pure condensing reference conditions, the intermediate-pressure cylinder inlet steam flow rate under the design conditions, the intermediate-pressure cylinder inlet steam pressure under the design conditions, and the pressure difference between the reheat cold section and the reheat hot section under the design conditions into the ninth formula, the high-pressure cylinder exhaust pressure of the turbine under pure condensing reference conditions can be obtained. The high-pressure cylinder exhaust pressure of the turbine under pure condensing reference conditions, the intermediate-pressure cylinder inlet flow rate of the turbine under pure condensing reference conditions, the high-pressure cylinder exhaust temperature under the design conditions, and the high-pressure cylinder efficiency under the design conditions are input into the tenth formula to obtain the high-pressure cylinder output correction amount caused by the high-pressure cylinder exhaust pressure deviation. The eighth formula is as follows: in, The correction amount for the output of the medium and low pressure cylinder caused by the preset industrial steam supply flow rate. This refers to the enthalpy of the steam entering the intermediate-pressure cylinder under the aforementioned design conditions. The enthalpy value of the low-pressure cylinder exhaust steam under the aforementioned design conditions; The ninth formula is: in, The high-pressure cylinder exhaust pressure of the turbine under pure condensing reference conditions. The intermediate pressure cylinder inlet pressure under the aforementioned design conditions. The pressure difference between the reheat cold section and the reheat hot section under the aforementioned design conditions; The tenth formula is: in, This is the correction amount for the output force of the high-pressure cylinder caused by the deviation in the exhaust pressure of the high-pressure cylinder. The high-pressure cylinder exhaust temperature is the temperature under the aforementioned design conditions. To preset the high-pressure cylinder exhaust pressure under the industrial steam supply flow rate. The high-pressure cylinder efficiency under the aforementioned design conditions. To calculate the enthalpy of a medium using a steam-water characteristic function based on the medium's pressure and entropy, To calculate the entropy of a medium using a steam-water characteristic function based on the medium pressure and temperature, This is a steam-water characteristic function for solving the enthalpy of a medium based on its pressure and entropy.

6. The method of claim 5, wherein the minimum peak shaving output of the industrial steam supply unit is evaluated based on the reheat heat section. The calculation of the minimum peak-shaving output of the unit under the preset industrial steam supply flow rate includes: The minimum peak-shaving output of the unit under the preset industrial steam supply flow rate is calculated using formula eleven. Formula eleven is as follows: wherein, is the minimum peak shaving output of the unit corresponding to the preset industrial steam supply flow.

7. The method of claim 5, wherein the minimum peak shaving output of the industrial steam supply unit is evaluated based on the reheat heat section. The unit's design operating data includes the intermediate pressure cylinder inlet steam temperature under design conditions; Before obtaining the high-pressure cylinder exhaust pressure of the steam turbine under pure condensing reference conditions, the method further includes: The intermediate-pressure cylinder inlet steam temperature under the design conditions, the pressure difference between the reheat cold section and the reheat hot section under the design conditions, the intermediate-pressure cylinder inlet steam flow rate under the design conditions, the intermediate-pressure cylinder inlet steam pressure under the design conditions, the minimum inlet steam pressure of the turbine intermediate-pressure cylinder required under the preset industrial steam supply flow rate, the minimum reheat steam flow rate under the preset industrial steam supply flow rate, and the preset industrial steam supply flow rate are input into the twelfth formula to obtain the pressure difference between the reheat cold section and the reheat hot section under the preset industrial steam supply flow rate. Input the pressure difference between the reheat cold section and the reheat hot section under the preset industrial steam supply flow rate and the minimum steam inlet pressure of the intermediate pressure cylinder of the turbine required under the preset industrial steam supply flow rate into the thirteenth formula to obtain the exhaust pressure of the high pressure cylinder under the preset industrial steam supply flow rate. The twelfth formula is as follows: in, The pressure difference between the reheat cold section and the reheat hot section under the preset industrial steam supply flow rate. The intermediate-pressure cylinder inlet steam temperature under the aforementioned design conditions. To determine the steam-water characteristic function of the specific volume of a medium based on its pressure and temperature, The minimum inlet steam pressure of the intermediate pressure cylinder of the steam turbine required under the preset industrial steam supply flow rate. The minimum reheat steam flow rate under the preset industrial steam supply flow rate; The thirteenth formula is: wherein, is the high-pressure cylinder exhaust pressure under the preset industrial steam supply flow rate.

8. A device for evaluating minimum peak shaving output of a unit for industrial steam supply in a reheat hot section, characterized in that, include: The function calculation module is used to calculate the resistance characteristic function of the reheat hot section industrial steam supply pipeline based on the unit's design operating condition data and the industrial steam supply system's test operating condition data. The unit's design operating condition data includes the design operating condition outlet and inlet pressure ratio of the back pressure turbine on the reheat hot section industrial steam supply pipeline. The flow calculation module is used to calculate the minimum inlet pressure of the intermediate pressure cylinder of the turbine required under the preset industrial steam supply flow rate based on the resistance characteristic function and the outlet and inlet pressure ratio of the back pressure turbine under the design operating conditions, and to calculate the minimum reheat steam flow rate under the preset industrial steam supply flow rate based on the minimum inlet pressure of the intermediate pressure cylinder of the turbine required under the preset industrial steam supply flow rate. The preset industrial steam supply flow rate is the industrial steam supply flow rate corresponding to any actual operating condition. The output calculation module is used to calculate the unit output of the steam turbine under pure condensing reference conditions based on the minimum reheat steam flow rate under the preset industrial steam supply flow rate, and to calculate the minimum peak-shaving output of the unit under the preset industrial steam supply flow rate based on the unit output of the steam turbine under the pure condensing reference conditions. The step of determining the minimum peak-shaving output of the computer unit under a preset industrial steam supply flow rate, based on the turbine's output under pure condensing reference conditions, includes: Based on the turbine output under the pure condensing reference condition, the output correction of the medium and low pressure cylinders caused by the preset industrial steam supply flow rate, and the output correction of the high pressure cylinder caused by the high pressure cylinder exhaust pressure deviation, the minimum peak-shaving output of the unit under the preset industrial steam supply flow rate is calculated; wherein, the pure condensing reference condition is a type of pure condensing operation state, in which all the high and low pressure main steam generated by the boiler is used to do work in the high pressure cylinder, medium pressure cylinder, and low pressure cylinder, without extracting steam to the heating pipeline system, and all the exhaust steam after doing work is condensed into water.

9. A terminal 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 steps of the method for evaluating the minimum peak output of a unit supplying industrial steam in the reheat section as described in any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the method for evaluating the minimum peak output of a unit supplying industrial steam in the reheat section as described in any one of claims 1 to 7.

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