Flow control method and device for heating and steam supply regulating valve of heat supply unit

Abstract

The invention provides a flow control method and device for a heating and steam supply regulating valve of a heat supply unit, and belongs to the field of heat supply and heating. The method comprises the following steps: determining a first characteristic curve of the characteristic flow coefficient and the opening degree of the heat supply regulating butterfly valve of the communicating pipe; a second characteristic curve of the characteristic flow coefficient and the opening degree of the heating steam supply regulating valve is determined; based on the first characteristic curve and the corrected characteristic through-flow coefficient of the communicating pipe heat supply adjusting butterfly valve, the opening degree of the communicating pipe heat supply adjusting butterfly valve corresponding to the preset adjusting amount of the heating steam extraction flow is determined; based on the second characteristic curve and the corrected characteristic through-flow coefficient of the heating steam supply adjusting valve, the opening degree of the heating steam supply adjusting valve corresponding to the preset adjusting amount of the heating steam extraction flow is determined; and based on the opening degree of the communication pipe heat supply adjusting butterfly valve corresponding to the heating steam extraction flow preset adjusting amount, the opening degree of the heating steam supply adjusting valve corresponding to the heating steam extraction flow preset adjusting amount and the opening degree preset range, the opening degree of the communication pipe heat supply adjusting butterfly valve and the opening degree of the heating steam supply adjusting valve are determined correspondingly. The flow of the heating and steam supply regulating valve of the heat supply unit can be accurately controlled.

Description

Technical Field

[0001] The invention relates to the technical field of heating, and in particular to a flow control method and device for a heating steam supply regulating valve of a heating unit. Background Art

[0002] With the large-scale access of new energy sources to the grid, the peak load support role of generator sets in the grid has become more prominent. In some areas, most generator sets also undertake the task of external heat supply. When the heating unit provides both heating and power generation tasks, if the frequency regulation parameters are not re-adjusted, when the heating load borne by the unit is large, the primary frequency regulation response performance of the steam turbine will deteriorate.

[0003] At present, the primary frequency regulation response capability of the heating unit is mainly enhanced by utilizing the thermal inertia of the heating network operation and using the heating extraction steam regulating valve to participate in the primary frequency regulation action in a short period of time. To use this solution, it is necessary to accurately control the flow of the heating steam regulating valve of the heating unit.

[0004] However, the current flow control of the regulating valve is not combined with the actual thermoelectric characteristics of the unit, resulting in inaccurate flow control. How to accurately control the flow of the heating steam supply regulating valve of the heating unit based on the actual thermoelectric characteristics of the unit has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The embodiment of the present invention provides a flow control method and device for a heating steam supply regulating valve of a heating unit, so as to solve the problem that the current flow control method is inaccurate.

[0006] In a first aspect, an embodiment of the present invention provides a flow control method for a heating steam supply regulating valve of a heating unit, comprising:

[0007] Determine a first characteristic curve of the characteristic flow coefficient and the opening degree of the connecting pipe heating regulating butterfly valve;

[0008] Determine the second characteristic curve of the characteristic flow coefficient and its opening of the heating steam supply regulating valve;

[0009] Based on the first characteristic curve and the corrected characteristic flow coefficient of the connecting pipe heating regulating butterfly valve, determine the opening of the connecting pipe heating regulating butterfly valve corresponding to the predetermined adjustment amount of the heating extraction steam flow;

[0010] Based on the second characteristic curve and the corrected heating steam supply regulating valve characteristic flow coefficient, determine the heating steam supply regulating valve opening corresponding to the predetermined heating steam extraction flow adjustment amount;

[0011] Based on the opening of the connecting pipe heating regulating butterfly valve corresponding to the predetermined adjustment amount of the heating steam extraction flow, the opening of the heating steam supply regulating valve corresponding to the predetermined adjustment amount of the heating steam extraction flow, and the preset range of openings, the openings of the connecting pipe heating regulating butterfly valve and the heating steam supply regulating valve are determined respectively.

[0012] In a possible implementation, determining a first characteristic curve of a characteristic flow coefficient and an opening of a connecting pipe heating regulating butterfly valve includes:

[0013] Based on the design heat balance diagram provided by the steam turbine manufacturer, the corresponding data of the low-pressure cylinder steam inlet flow rate and the low-pressure cylinder steam inlet pressure under multiple design conditions are summarized, and the first fitting function of the low-pressure cylinder steam inlet flow rate and the low-pressure cylinder steam inlet pressure is obtained by fitting;

[0014] Based on the first fitting function and the low-pressure cylinder steam inlet pressure under different heating steam supply flow conditions, the low-pressure cylinder steam inlet flow under different heating steam supply flow conditions is calculated;

[0015] Based on the steam inlet flow rate of the low-pressure cylinder under different heating steam flow conditions, the characteristic flow coefficient of the connecting pipe heating regulating butterfly valve is determined;

[0016] Based on the characteristic flow coefficient of the connecting pipe heating regulating butterfly valve and the opening data of the connecting pipe heating regulating butterfly valve under multiple heating steam flow conditions, a first characteristic curve is obtained by fitting.

[0017] In a possible implementation, the characteristic flow coefficient F of the connecting pipe heating regulating butterfly valve is IPLPCV(i) The formula for determining is:

[0018] When p LPin(i) ≥Kcr×p IPexh(i) hour,

[0019]

[0020] When p LPin(i) <Kcr×p IPexh(i) hour,

[0021] F IPLPCV(i) =F LP(i) ;

[0022] Among them, F LP(i) is the steam inlet flow rate of the low-pressure cylinder of the i-th heating steam supply, p IPexh(i) is the exhaust steam pressure of the intermediate pressure cylinder of the i-th heating steam supply, p LPin(i) is the steam inlet pressure of the low-pressure cylinder of the i-th heating steam supply, and Kcr is the critical pressure ratio of superheated steam.

[0023] In a possible implementation, determining a second characteristic curve of a characteristic flow coefficient and an opening of a heating steam supply regulating valve includes:

[0024] Based on the outlet water temperature of the heating network heater under different heating steam flow conditions, the steam inlet pressure of the heating network heater under different heating steam flow conditions is calculated;

[0025] Based on the steam inlet pressure of the heating network heater under different heating steam flow conditions, the characteristic flow coefficient of the heating steam regulating valve is determined;

[0026] Based on the characteristic flow coefficient of the heating steam supply regulating valve and the opening data of the heating steam supply regulating valve under multiple heating steam supply flow conditions, a second characteristic curve is obtained by fitting.

[0027] In a possible implementation, the characteristic flow coefficient F of the heating steam supply regulating valve is CNCV(i) for:

[0028] When p DHin(i) ≥Kcr×p IPexh(i) hour,

[0029]

[0030] When p DHin(i) <Kcr×p IPexh(i) hour,

[0031] F CNCV(i) =F CN(i) ;

[0032] Among them, F CN(i) is the heating steam flow rate of the i-th heating steam supply, p IPexh(i) is the exhaust steam pressure of the intermediate pressure cylinder of the i-th heating steam supply, p DHin(i) is the steam inlet pressure of the i-th heating network heater for heating steam supply, and Kcr is the critical pressure ratio of superheated steam.

[0033] In a possible implementation, based on the first characteristic curve and the corrected characteristic flow coefficient of the connecting pipe heating regulating butterfly valve, determining the opening of the connecting pipe heating regulating butterfly valve corresponding to the predetermined adjustment amount of the heating extraction steam flow rate includes:

[0034] Based on the low-pressure cylinder steam inlet pressure under normal heating operation conditions of the target heating unit, the corresponding low-pressure cylinder steam inlet flow rate is calculated;

[0035] Calculate the characteristic flow coefficient of the connecting pipe heating regulating butterfly valve corresponding to the heating extraction steam flow regulation, and the characteristic flow coefficient of the connecting pipe heating regulating butterfly valve corrected to the test state;

[0036] Based on the first characteristic curve and the characteristic flow coefficient of the connecting pipe heating regulating butterfly valve corrected to the test state, the opening of the connecting pipe heating regulating butterfly valve corresponding to the predetermined adjustment amount of the heating steam extraction flow is determined.

[0037] In a possible implementation, the corresponding flow coefficient F of the heating regulating butterfly valve of the connecting pipe after the heating extraction steam flow is adjusted IPLPCVnew The formula for determining ′ is:

[0038] When p′ LPinnew ≥Kcr×p IPexh 'hour,

[0039]

[0040] When p′ LPinnew <Kcr×p IPexh 'hour,

[0041] F IPLPCVnew ′=F LP ′;

[0042] Corrected to the characteristic flow coefficient F of the connecting pipe heating regulating butterfly valve under the test state IPLPCVCor 'for:

[0043]

[0044] Among them, p′ LPinnew is the steam inlet pressure of the low-pressure cylinder after the heating extraction steam flow is adjusted, Kcr is the critical pressure ratio of superheated steam, p IPexh ′ is the exhaust steam pressure of the intermediate pressure cylinder during normal heating operation, F LP ′ is the steam flow rate of the low-pressure cylinder during normal heating operation, p ipex-set is the setting value for all test conditions.

[0045] In a possible implementation, based on the second characteristic curve and the corrected heating steam supply regulating valve characteristic flow coefficient, determining the heating steam supply regulating valve opening corresponding to the predetermined heating steam extraction flow adjustment amount includes:

[0046] Determine the outlet temperature of the new heating network heater according to the circulating water volume of the heating network and the adjustment amount of the heating extraction steam flow under the normal heating operation condition of the target heating unit;

[0047] Based on the new outlet temperature of the heating network heater, determine the characteristic flow coefficient of the heating steam supply regulating valve corresponding to the heating extraction steam flow rate adjustment, and the characteristic flow coefficient of the heating steam supply regulating valve corrected to the test state;

[0048] Based on the second characteristic curve and the corrected characteristic flow coefficient of the heating steam supply regulating valve, the opening of the heating steam supply regulating valve corresponding to the predetermined adjustment amount of the heating steam extraction flow is determined.

[0049] In a possible implementation, the heating steam supply regulating valve characteristic flow coefficient F corresponding to the heating steam extraction flow rate is CNCVnew The formula for determining ′ is:

[0050] When p DHinnew ′≥Kcr×p IPexh 'hour,

[0051]

[0052] When p DHinnew ' <Kcr×p IPexh 'hour,

[0053] F CNCVnew ′=F CNnew ′;

[0054] Corrected to the heating steam supply regulating valve characteristic flow coefficient F under test state CNCVCor The formula for determining ′ is:

[0055]

[0056] Among them, p DHinnew ′ is the steam inlet pressure of the heating network heater after the heating extraction steam flow is adjusted, Kcr is the critical pressure ratio of superheated steam, p IPexh ′ is the exhaust steam pressure of the intermediate pressure cylinder in normal heating operation, F CNnew ′ is the heating steam flow after the heating extraction steam flow is adjusted, p ipex-set is the setting value for all test conditions.

[0057] In a second aspect, an embodiment of the present invention provides a flow control device for a heating steam supply regulating valve of a heating unit, comprising:

[0058] A first curve determination module, used to determine a first characteristic curve of a characteristic flow coefficient and an opening degree of a connecting pipe heating regulating butterfly valve;

[0059] A second curve determination module, used to determine a second characteristic curve of a characteristic flow coefficient and an opening of a heating steam supply regulating valve;

[0060] A first opening determination module is used to determine the opening of the connecting pipe heating regulating butterfly valve corresponding to the predetermined adjustment amount of the heating extraction steam flow rate based on the first characteristic curve and the corrected characteristic flow coefficient of the connecting pipe heating regulating butterfly valve;

[0061] A second opening determination module is used to determine the opening of the heating steam supply regulating valve corresponding to the predetermined adjustment amount of the heating steam extraction flow rate based on the second characteristic curve and the corrected characteristic flow coefficient of the heating steam supply regulating valve;

[0062] The final value determination module is used to determine the openings of the connecting pipe heating regulating butterfly valve and the heating steam supply regulating valve based on the opening of the connecting pipe heating regulating butterfly valve corresponding to the predetermined adjustment amount of the heating extraction steam flow, the opening of the heating steam supply regulating valve corresponding to the predetermined adjustment amount of the heating extraction steam flow, and the preset range of the openings.

[0063] The embodiment of the present invention provides a flow control method and device for a heating steam supply regulating valve of a heating unit, by determining a first characteristic curve of a connecting pipe heating regulating butterfly valve and its opening and a second characteristic curve of a heating steam supply regulating valve and its opening, based on the above curves, the connecting pipe heating regulating butterfly valve opening corresponding to a predetermined adjustment amount of the heating steam extraction flow can be obtained based on the first characteristic curve and the corrected characteristic flow coefficient of the connecting pipe heating regulating butterfly valve; the heating steam supply regulating valve opening corresponding to a predetermined adjustment amount of the heating steam extraction flow can be obtained based on the second characteristic curve and the corrected characteristic flow coefficient of the heating steam supply regulating valve. Finally, based on the connecting pipe heating regulating butterfly valve opening corresponding to the predetermined adjustment amount of the heating steam extraction flow, the heating steam supply regulating valve opening corresponding to the predetermined adjustment amount of the heating steam extraction flow, and the preset range of the opening, the openings of the connecting pipe heating regulating butterfly valve and the heating steam supply regulating valve can be determined respectively. Based on the inherent thermoelectric characteristics of the heating unit and combined with the characteristics of each heating regulating valve, the present invention realizes the precise control of the flow rate of the heating steam regulating valve of the heating unit. It can also be used to enhance the primary frequency regulation response capability of the steam turbine of the heating unit or improve the response capability of the automatic power generation control of the heating unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0065] Figure 1 It is a flow chart of the implementation of the flow control method of the heating steam supply regulating valve of the heating unit provided by the embodiment of the present invention;

[0066] Figure 2 It is a structural flow chart of a flow control method of a heating steam supply regulating valve of a heating unit provided by an embodiment of the present invention;

[0067] Figure 3 It is a structural schematic diagram of a flow control device of a heating steam supply regulating valve of a heating unit provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0068] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0069] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below in conjunction with the accompanying drawings.

[0070] Figure 1 and 2 The implementation flow chart of the flow control method of the heating steam supply regulating valve of the heating unit provided by the embodiment of the present invention is described in detail as follows:

[0071] S110, determining a first characteristic curve of the characteristic flow coefficient and the opening degree of the connecting pipe heating regulating butterfly valve.

[0072] In order to accurately control the flow of the heating steam supply regulating valve of the heating unit, it is necessary to first carry out the flow test of the heating regulating butterfly valve and the heating steam supply regulating valve of the heating unit's extraction and condensation heating mode. Specifically including:

[0073] (1) Basic operating mode of the unit.

[0074] (2) The heating unit adopts extraction condensing heating mode and the steam turbine adopts 80% rated steam inlet flow condition.

[0075] (3) During the test, the middle row pressure is kept stable at the set value P ipex-set .

[0076] (4) The adjustment range of heating steam extraction flow rate is from rated heating steam extraction flow rate to zero, and it is reduced by 50t / h each time. After each adjustment, the operating parameters shall be recorded after the heating steam extraction flow rate, water level of the heating network heater, intermediate discharge pressure and unit power output are stable.

[0077] (5) The recorded operating parameters include: unit electrical output, intermediate exhaust pressure, heating steam extraction flow, low-pressure cylinder steam inlet pressure, connecting pipe heating regulating butterfly valve opening, heating steam supply regulating valve opening, and heating network heater outlet water temperature.

[0078] After obtaining the basic data through the above experiments, corresponding control can be carried out.

[0079] In some embodiments, the process of determining the first characteristic curve of the characteristic flow coefficient and the opening of the connecting pipe heating regulating butterfly valve is as follows:

[0080] Firstly, based on the design heat balance diagram provided by the steam turbine manufacturer, the corresponding data of the low-pressure cylinder steam inlet flow rate and the low-pressure cylinder steam inlet pressure under multiple design conditions are summarized, and the first fitting function of the low-pressure cylinder steam inlet flow rate and the low-pressure cylinder steam inlet pressure is obtained by fitting.

[0081] Next, based on the first fitting function and the low-pressure cylinder steam inlet pressure under different heating steam supply flow conditions, the low-pressure cylinder steam inlet flow under different heating steam supply flow conditions is calculated.

[0082] Then, based on the steam inlet flow rate of the low-pressure cylinder under different heating steam flow conditions, the characteristic flow coefficient of the connecting pipe heating regulating butterfly valve is determined.

[0083] Finally, based on the characteristic flow coefficient of the connecting pipe heating regulating butterfly valve and the opening data of the connecting pipe heating regulating butterfly valve under multiple heating steam flow conditions, the first characteristic curve is fitted.

[0084] In this embodiment, the first fitting function of the low-pressure cylinder steam inlet flow rate and the low-pressure cylinder steam inlet pressure is obtained as F LP =f1(p LPin ), where f1() is the fitting function.

[0085] In this embodiment, the characteristic flow coefficient F of the connecting pipe heating regulating butterfly valve is IPLPCV(i) The formula for determining is:

[0086] When p LPin(i) ≥Kcr×p IPexh(i) hour,

[0087]

[0088] When p LPin(i) <Kcr×p IPexh(i) hour,

[0089] F IPLPCV(i) =F LP(i) ;

[0090] Among them, F LP(i) is the steam inlet flow rate of the low-pressure cylinder of the i-th heating steam supply, p IPexh(i) is the exhaust steam pressure of the intermediate pressure cylinder of the i-th heating steam supply, p LPin(i) is the steam inlet pressure of the low-pressure cylinder of the i-th heating steam supply, and Kcr is the critical pressure ratio of superheated steam.

[0091] In this embodiment, the characteristic flow coefficient F of the connecting pipe heating regulating butterfly valve under multiple heating steam flow conditions is IPLPCV The opening data VO of the heating regulating butterfly valve of the connecting pipe IPLPCV , the first characteristic curve F is obtained by fitting IPLPCV =f2(VO IPLPCV), where f2() is the fitting function.

[0092] S120, determining a second characteristic curve of the characteristic flow coefficient and the opening of the heating steam supply regulating valve.

[0093] In some embodiments, first, based on the outlet water temperature of the heating network heater under different heating steam supply flow conditions, the steam inlet pressure of the heating network heater under different heating steam supply flow conditions can be calculated.

[0094] Next, the characteristic flow coefficient of the heating steam supply regulating valve is determined based on the steam inlet pressure of the heating network heater under different heating steam supply flow conditions.

[0095] Finally, based on the characteristic flow coefficient of the heating steam supply regulating valve and the opening data of the heating steam supply regulating valve under multiple heating steam flow conditions, the second characteristic curve is fitted.

[0096] In this embodiment, the steam inlet pressure p of the heating network heater under different heating steam flow conditions DHin(i) , p DHin(i) =f3(t DHWo(i) +TTD DH );

[0097] Among them, p DHin is the steam inlet pressure of the heating network heater, t DHWo is the outlet water temperature of the heating network heater, and f3() is the steam-water characteristic function used by the International Federation of Water and Steam Properties to calculate the saturation pressure based on temperature. TTD DH It is the design end difference of the heating network heater.

[0098] In this embodiment, the characteristic flow coefficient F of the heating steam regulating valve under any heating steam flow condition is CNCV(i) for:

[0099] When p DHin(i) ≥Kcr×p IPexh(i) hour,

[0100]

[0101] When p DHin(i) <Kcr×p IPexh(i) hour,

[0102] F CNCV(i) =F CN(i) ;

[0103] Among them, F CN(i) is the heating steam flow rate of the i-th heating steam supply, p IPexh(i) is the exhaust steam pressure of the intermediate pressure cylinder of the i-th heating steam supply, p DHin(i) is the steam inlet pressure of the i-th heating network heater for heating steam supply, and Kcr is the critical pressure ratio of superheated steam.

[0104] In this embodiment, the heating steam supply regulating valve characteristic flow coefficient and the heating steam supply regulating valve opening data under multiple heating steam supply flow conditions are summarized, and the heating steam supply regulating valve characteristic flow coefficient F is fitted. CNCV and heating steam supply valve opening VO CNCV The second characteristic curve F CNCV =f4(VO CNCV ), where f4() is the fitting function.

[0105] S130. Based on the first characteristic curve and the corrected characteristic flow coefficient of the connecting pipe heating regulating butterfly valve, determine the opening of the connecting pipe heating regulating butterfly valve corresponding to the predetermined adjustment amount of the heating steam extraction flow.

[0106] In some embodiments, first, based on the low-pressure cylinder steam inlet pressure under normal heating operation conditions of the target heating unit, the corresponding low-pressure cylinder steam inlet flow rate can be calculated.

[0107] Then, the characteristic flow coefficient of the connecting pipe heating regulating butterfly valve corresponding to the heating extraction steam flow regulation is calculated, as well as the characteristic flow coefficient of the connecting pipe heating regulating butterfly valve corrected to the test state.

[0108] Finally, based on the first characteristic curve and the characteristic flow coefficient of the connecting pipe heating regulating butterfly valve corrected to the test state, the opening of the connecting pipe heating regulating butterfly valve corresponding to the predetermined adjustment amount of the heating steam extraction flow is determined.

[0109] In this embodiment, first, according to the low-pressure cylinder steam inlet pressure p′ under the normal heating operation condition of the current heating unit, LPin , calculate the corresponding low-pressure cylinder steam inlet flow F′ LP .

[0110] Then, after the heating extraction steam flow rate is set to △F, the low-pressure cylinder steam flow rate changes to F′ LPnew =F′ LP -ΔF, the corresponding low pressure cylinder inlet pressure change is p′ LPinnew .

[0111] Next, calculate the characteristic flow coefficient of the connecting pipe heating regulating butterfly valve corresponding to the heating extraction steam flow regulation.

[0112] When p′ LPinnew ≥Kcr×p IPexh 'hour,

[0113]

[0114] When p ′I ′LPinnew <Kcr×p IPexh ′, FIPLPCVnew ′=F LP ′;

[0115] Among them, p I LPinnew is the steam inlet pressure of the low-pressure cylinder after the heating extraction steam flow is adjusted, Kcr is the critical pressure ratio of superheated steam, p IPexh ′ is the exhaust steam pressure of the intermediate pressure cylinder during normal heating operation, F LP ' is the steam flow rate of the low-pressure cylinder during normal heating operation. The superscript ' is the data of normal heating operation condition, and the subscript with "new" is the corresponding data after the heating extraction steam flow rate is adjusted.

[0116] Secondly, calculate the characteristic flow coefficient F of the connecting pipe heating regulating butterfly valve corrected to the test state. IPLPCVCor ′,

[0117]

[0118] Among them, p ipex-set is the setting value for all test conditions.

[0119] Finally, according to the interconnecting pipe heating, the characteristic flow coefficient F of the butterfly valve is adjusted. IPLPCV The opening of the butterfly valve VO is adjusted with the connecting pipe heating IPLPCV The first characteristic curve F IPLPCV =f2(VO IPLPCV ), calculate the corrected flow coefficient F of the connecting pipe heating regulating butterfly valve IPLPCVCor ′Corresponding opening of the connecting pipe heating regulating butterfly valve VO IPLPCVnew ′.

[0120] S140. Based on the second characteristic curve and the corrected characteristic flow coefficient of the heating steam supply regulating valve, determine the opening of the heating steam supply regulating valve corresponding to the predetermined adjustment amount of the heating steam extraction flow.

[0121] In some embodiments, first, a new outlet temperature of the heating network heater can be determined based on the amount of circulating water in the heating network and the adjustment amount of heating extraction steam flow under normal heating operation conditions of the target heating unit.

[0122] Then, based on the new outlet temperature of the heating network heater, the characteristic flow coefficient of the heating steam supply regulating valve corresponding to the heating extraction steam flow rate is determined, as well as the characteristic flow coefficient of the heating steam supply regulating valve corrected to the test state.

[0123] Finally, based on the second characteristic curve and the corrected heating steam supply regulating valve characteristic flow coefficient, the heating steam supply regulating valve opening corresponding to the predetermined adjustment amount of the heating steam extraction flow is determined.

[0124] In this embodiment, first, according to the heat network circulating water volume F′ under the normal heating operation condition of the current heating unit, DHW , and the heating extraction steam flow predetermined adjustment amount ΔF, calculate the new heating network heater outlet temperature t′ DHWonew :

[0125]

[0126] Among them, ΔHcon is the condensation enthalpy of heating extraction steam, which can be taken as the design value; C W is the specific heat of water.

[0127] Then, the new steam inlet pressure p of the heating network heater after increasing the heating extraction steam flow adjustment amount is calculated. DHinnew ′,p DHinnew ′=f3(t′ DHWonew +TTD DH ).

[0128] Next, calculate the characteristic flow coefficient of the heating steam supply regulating valve corresponding to the heating extraction steam flow rate adjustment.

[0129] When p DHinnew ′≥Kcr×p IPexh 'hour,

[0130]

[0131] When p DHinnew ' <Kcr×p IPexh ′, F CNCVnew ′=F CNnew ′;

[0132] In the formula, the superscript ' is the data of normal heating operation condition, and the subscript "new" is the corresponding data after the heating extraction steam flow is adjusted. DHinnew ′ is the steam inlet pressure of the heating network heater after the heating extraction steam flow is adjusted, Kcr is the critical pressure ratio of superheated steam, p IPexh ′ is the exhaust steam pressure of the intermediate pressure cylinder in normal heating operation, F CNnew ′ is the heating steam flow after the heating extraction steam flow is adjusted, p ipex-set is the setting value for all test conditions.

[0133] Finally, according to the characteristic flow coefficient F of the heating steam regulating valve CNCV and heating steam supply valve opening VO CNCV The second characteristic curve FC NCV =f4(VO CNCV ), calculate the corrected heating steam supply regulating valve characteristic flow coefficient FC NCVCor ′Corresponding heating steam supply valve opening VO CNCVnew ′.

[0134] S150. Based on the opening of the connecting pipe heating regulating butterfly valve corresponding to the predetermined adjustment amount of the heating steam extraction flow rate, the opening of the heating steam supply regulating valve corresponding to the predetermined adjustment amount of the heating steam extraction flow rate, and the preset range of the opening, respectively determine the openings of the connecting pipe heating regulating butterfly valve and the heating steam supply regulating valve.

[0135] In some embodiments, the upper and lower limits of the opening of the connecting pipe heat supply regulating butterfly valve and the heating steam supply regulating valve are:

[0136] VO CNCVmin ≤VO CNCV ≤VO CNCVmax ;

[0137] VO IPLPCVmin ≤VO IPLPCV ≤VO IPLPCvmax ;

[0138] For the inter-connecting pipe heating regulating butterfly valve, the final opening is determined according to the following principles:

[0139] When VO IPLPCVmin ≤VO IPLPCVnew ′≤VO IPLPCVmax When the final opening is VO IPLPCVnew ′;

[0140] When VO IPLPCVmax <VO IPLPCVnew ′, the final opening is VO IPLPCVmax ;

[0141] When VO IPLPCVmin >VO IPLPCVnew ′, the final opening is VO IPLPCVmin ;

[0142] For the heating steam supply regulating valve, the final opening is determined according to the following principles:

[0143] When VO CNCVmin ≤VO CNCVnew ′≤VO CNCVmax When the final opening is VO CNCVnew ′;

[0144] When VO CNCVmax <VO CNCVnew ′, the final opening is VO CNCVmax ;

[0145] When VO CNCVmin >VO CNCVnew ′, the final opening is VO CNCVmin .

[0146] Based on the inherent thermoelectric characteristics of the heating unit and the characteristics of each heating regulating valve, the present invention calculates the final opening of all heating extraction steam regulating valves after the heating extraction steam flow regulation is achieved. It can be used to enhance the primary frequency regulation response capability of the heating unit steam turbine or improve the AGC response capability of the heating unit, and can effectively improve the grid-related performance of the heating unit.

[0147] The flow control method provided by the present invention determines the first characteristic curve of the characteristic flow coefficient and the opening of the connecting pipe heating regulating butterfly valve and the second characteristic curve of the characteristic flow coefficient and the opening of the heating steam supply regulating valve. Based on the above curves, the connecting pipe heating regulating butterfly valve opening corresponding to the predetermined adjustment amount of the heating steam extraction flow can be obtained based on the first characteristic curve and the corrected characteristic flow coefficient of the connecting pipe heating regulating butterfly valve; based on the second characteristic curve and the corrected characteristic flow coefficient of the heating steam supply regulating valve, the heating steam supply regulating valve opening corresponding to the predetermined adjustment amount of the heating steam extraction flow can be obtained. Finally, based on the connecting pipe heating regulating butterfly valve opening corresponding to the predetermined adjustment amount of the heating steam extraction flow, the heating steam supply regulating valve opening corresponding to the predetermined adjustment amount of the heating steam extraction flow, and the preset range of the opening, the openings of the connecting pipe heating regulating butterfly valve and the heating steam supply regulating valve can be determined respectively. Based on the inherent thermoelectric characteristics of the heating unit and combined with the characteristics of each heating regulating valve, the present invention realizes precise control of the flow of the heating steam supply regulating valve of the heating unit. It can also be used to enhance the primary frequency regulation response capability of the steam turbine of a heating unit or to improve the response capability of the automatic power generation control of a heating unit.

[0148] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean 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 embodiment of the present invention.

[0149] The following is an embodiment of the device of the present invention. For details not described in detail, reference may be made to the corresponding method embodiments described above.

[0150] Figure 3 The structural schematic diagram of the flow control device of the heating steam supply regulating valve of the heating unit provided by the embodiment of the present invention is shown. For the convenience of description, only the part related to the embodiment of the present invention is shown, which is described in detail as follows:

[0151] like Figure 3 As shown, the flow control device 300 of the heating steam supply regulating valve of the heating unit includes:

[0152] A first curve determination module 310, for determining a first characteristic curve of a characteristic flow coefficient and an opening degree of a heat supply regulating butterfly valve of a connecting pipe;

[0153] A second curve determination module 320, for determining a second characteristic curve of a characteristic flow coefficient and an opening of a heating steam supply regulating valve;

[0154] The first opening degree determination module 330 is configured to determine the opening degree of the connecting pipe heat supply regulating butterfly valve corresponding to achieving a predetermined regulation amount of the heating extraction steam flow based on the first characteristic curve and the corrected characteristic flow coefficient of the connecting pipe heat supply regulating butterfly valve;

[0155] The second opening degree determination module 340 is configured to determine the opening degree of the heating steam supply regulating valve corresponding to achieving a predetermined regulation amount of the heating extraction steam flow based on the second characteristic curve and the corrected characteristic flow coefficient of the heating steam supply regulating valve;

[0156] The final value determination module 350 is configured to determine the opening degrees of the connecting pipe heat supply regulating butterfly valve and the heating steam supply regulating valve respectively based on the opening degree of the connecting pipe heat supply regulating butterfly valve corresponding to achieving a predetermined regulation amount of the heating extraction steam flow, the opening degree of the heating steam supply regulating valve corresponding to achieving a predetermined regulation amount of the heating extraction steam flow, and the preset range of the opening degree.

[0157] In a possible implementation manner, the first curve determination module 310 is configured to summarize the corresponding data of the low-pressure cylinder inlet steam flow and the low-pressure cylinder inlet steam pressure under multiple design conditions based on the design heat balance diagram provided by the steam turbine manufacturer, and fit to obtain the first fitting function of the low-pressure cylinder inlet steam flow and the low-pressure cylinder inlet steam pressure;

[0158] Based on the first fitting function and the low-pressure cylinder inlet steam pressure under different heating steam supply flow conditions, calculate the low-pressure cylinder inlet steam flow under different heating steam supply flow conditions;

[0159] Based on the low-pressure cylinder inlet steam flow under different heating steam supply flow conditions, determine the characteristic flow coefficient of the connecting pipe heat supply regulating butterfly valve;

[0160] Based on the characteristic flow coefficients of the connecting pipe heat supply regulating butterfly valve and the opening degree data of the connecting pipe heat supply regulating butterfly valve under multiple heating steam supply flow conditions, fit to obtain the first characteristic curve.

[0161] In a possible implementation manner, the determination formula for the characteristic flow coefficient FIPLPCV(i) of the connecting pipe heat supply regulating butterfly valve is:

[0162] When pLPin(i) ≥ Kcr × pIPexh(i),

[0163]

[0164] When pLPin(i) < Kcr × pIPexh(i),

[0165] FIPLPCV(i) = FLP(i);

[0166] Among them, FLP(i) is the low-pressure cylinder inlet steam flow rate of the i-th heating steam supply, and pIPexh(i) is the intermediate-pressure cylinder exhaust steam pressure of the i-th heating steam supply. pLPin(i) is the low-pressure cylinder inlet steam pressure of the i-th heating steam supply, and Kcr is the critical pressure ratio of superheated steam.

[0167] In a possible implementation manner, the second curve determination module 320 is configured to calculate the inlet steam pressure of the heat network heater under different heating steam supply flow conditions based on the outlet water temperature of the heat network heater under different heating steam supply flow conditions;

[0168] Determine the flow coefficient of the through-flow characteristic of the heating steam supply regulating valve based on the inlet steam pressure of the heat network heater under different heating steam supply flow conditions;

[0169] Fit the second characteristic curve based on the flow coefficient of the through-flow characteristic of the heating steam supply regulating valve and the opening data of the heating steam supply regulating valve under multiple heating steam supply flow conditions.

[0170] In a possible implementation manner, the flow coefficient of the through-flow characteristic of the heating steam supply regulating valve FCNCV(i) is:

[0171] When pDHin(i) ≥ Kcr × pIPexh(i),

[0172]

[0173] When pDHin(i) < Kcr × pIPexh(i),

[0174] FCNCV(i) = FCN(i);

[0175] Among them, FCN(i) is the heating steam supply flow rate of the i-th heating steam supply, pIPexh(i) is the intermediate-pressure cylinder exhaust steam pressure of the i-th heating steam supply, and p DHin(i) is the inlet steam pressure of the heat network heater of the i-th heating steam supply, and Kcr is the critical pressure ratio of superheated steam.

[0176] In a possible implementation manner, the first opening determination module 330 is configured to calculate the corresponding low-pressure cylinder inlet steam flow rate based on the low-pressure cylinder inlet steam pressure under the normal heating operation condition of the target heat supply unit;

[0177] Calculate the flow coefficient of the through-flow characteristic of the connecting pipe heating regulating butterfly valve corresponding to the adjusted heating extraction steam flow rate, and the flow coefficient of the through-flow characteristic of the connecting pipe heating regulating butterfly valve corrected to the test state;

[0178] Determine the opening of the connecting pipe heating regulating butterfly valve corresponding to the predetermined adjustment amount of the heating extraction steam flow rate based on the first characteristic curve and the flow coefficient of the through-flow characteristic of the connecting pipe heating regulating butterfly valve corrected to the test state.

[0179] In a possible implementation, the corresponding flow coefficient F of the heating regulating butterfly valve of the connecting pipe after the heating extraction steam flow is adjusted IPLPCVnew The formula for determining ′ is:

[0180] When p′L Pinnew ≥Kcr×p IPexh 'hour,

[0181]

[0182] When p′L Pinnew <Kcr×p IPexh 'hour,

[0183] F IPLPCVnew ′=F LP ′;

[0184] Corrected to the characteristic flow coefficient F of the connecting pipe heating regulating butterfly valve under the test state IPLPCVCor 'for:

[0185]

[0186] Among them, p′L Pinnew is the steam inlet pressure of the low-pressure cylinder after the heating extraction steam flow is adjusted, Kcr is the critical pressure ratio of superheated steam, p IPexh ′ is the exhaust steam pressure of the intermediate pressure cylinder during normal heating operation, F LP ′ is the steam flow rate of the low-pressure cylinder during normal heating operation, p ipex-set is the setting value for all test conditions.

[0187] In a possible implementation, the second opening degree determination module 340 is used to determine a new outlet temperature of the heating network heater according to the heating network circulating water volume and the heating extraction steam flow adjustment amount under the normal heating operation condition of the target heating unit;

[0188] Based on the new outlet temperature of the heating network heater, determine the characteristic flow coefficient of the heating steam supply regulating valve corresponding to the heating extraction steam flow rate adjustment, and the characteristic flow coefficient of the heating steam supply regulating valve corrected to the test state;

[0189] Based on the second characteristic curve and the corrected characteristic flow coefficient of the heating steam supply regulating valve, the opening of the heating steam supply regulating valve corresponding to the predetermined adjustment amount of the heating steam extraction flow is determined.

[0190] In a possible implementation, the heating steam supply regulating valve characteristic flow coefficient F corresponding to the heating steam extraction flow rate is CNCVnew The formula for determining ′ is:

[0191] When p DHinnew ′≥Kcr×p IPexh 'hour,

[0192]

[0193] When p DHinnew ′<Kcr×p IPexh 'hour,

[0194] F CNCVnew ′=F CNnew ′;

[0195] Corrected to the heating steam supply regulating valve characteristic flow coefficient F under test state CNCVCor The formula for determining ′ is:

[0196]

[0197] Among them, p DHinnew ′ is the steam inlet pressure of the heating network heater after the heating extraction steam flow is adjusted, Kcr is the critical pressure ratio of superheated steam, p IPexh ′ is the exhaust steam pressure of the intermediate pressure cylinder in normal heating operation, F CNnew ′ is the heating steam flow after the heating extraction steam flow is adjusted, p ipex-set is the setting value for all test conditions.

[0198] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0199] Those of ordinary skill in the art will appreciate that the templates, units, and algorithm steps of each example 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 performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0200] If the module / unit is implemented in the form of 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, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, it can implement the steps of the flow control method embodiments of the heating steam supply regulating valve of each heating unit. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier signal, telecommunication signal and software distribution medium.

[0201] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A flow control method for a heating steam supply regulating valve of a heating unit, characterized in that: include: Determine a first characteristic curve of the characteristic flow coefficient and the opening degree of the connecting pipe heating regulating butterfly valve; Determine the second characteristic curve of the characteristic flow coefficient and its opening of the heating steam supply regulating valve; Based on the first characteristic curve and the corrected characteristic flow coefficient of the connecting pipe heating regulating butterfly valve, determining the opening of the connecting pipe heating regulating butterfly valve corresponding to the predetermined adjustment amount of the heating extraction steam flow; Based on the second characteristic curve and the corrected heating steam supply regulating valve characteristic flow coefficient, determining the heating steam supply regulating valve opening corresponding to the predetermined heating steam extraction flow adjustment amount; Based on the opening of the connecting pipe heating regulating butterfly valve corresponding to the predetermined adjustment amount of the heating steam extraction flow rate, the opening of the heating steam supply regulating valve corresponding to the predetermined adjustment amount of the heating steam extraction flow rate, and the preset range of openings, the openings of the connecting pipe heating regulating butterfly valve and the heating steam supply regulating valve are respectively determined.

2. The flow control method of the heating steam supply regulating valve of the heating unit according to claim 1 is characterized in that: The first characteristic curve for determining the characteristic flow coefficient and opening degree of the connecting pipe heating regulating butterfly valve includes: Based on the design heat balance diagram provided by the steam turbine manufacturer, the corresponding data of the low-pressure cylinder steam inlet flow rate and the low-pressure cylinder steam inlet pressure under multiple design conditions are summarized, and the first fitting function of the low-pressure cylinder steam inlet flow rate and the low-pressure cylinder steam inlet pressure is obtained by fitting; Based on the first fitting function and the low-pressure cylinder steam inlet pressure under different heating steam supply flow conditions, the low-pressure cylinder steam inlet flow under different heating steam supply flow conditions is calculated; Determine the characteristic flow coefficient of the connecting pipe heating regulating butterfly valve based on the low-pressure cylinder steam inlet flow under different heating steam flow conditions; The first characteristic curve is obtained by fitting based on the characteristic flow coefficient of the connecting pipe heating regulating butterfly valve and the opening data of the connecting pipe heating regulating butterfly valve under multiple heating steam flow conditions.

3. The flow control method of the heating steam supply regulating valve of the heating unit according to claim 2 is characterized in that: The characteristic flow coefficient F of the connecting pipe heating regulating butterfly valve IPLPCV(i) The formula for determining is: When p LPin(i) ≥Kcr×p IPexh(i) hour, When p LPin(i) <Kcr×p IPexh(i) hour, F IPLPCV(i) =F LP(i) ; Among them, F LP(i) is the steam inlet flow rate of the low-pressure cylinder of the i-th heating steam supply, p IPexh(i) is the exhaust steam pressure of the intermediate pressure cylinder of the i-th heating steam supply, p LPin(i) is the steam inlet pressure of the low-pressure cylinder of the i-th heating steam supply, and Kcr is the critical pressure ratio of superheated steam.

4. The flow control method of the heating steam supply regulating valve of the heating unit according to claim 1, characterized in that: The second characteristic curve for determining the characteristic flow coefficient and opening degree of the heating steam supply regulating valve includes: Based on the outlet water temperature of the heating network heater under different heating steam flow conditions, the steam inlet pressure of the heating network heater under different heating steam flow conditions is calculated; Based on the steam inlet pressure of the heating network heater under different heating steam flow conditions, the characteristic flow coefficient of the heating steam regulating valve is determined; The second characteristic curve is obtained by fitting based on the characteristic flow coefficient of the heating steam supply regulating valve and the opening data of the heating steam supply regulating valve under multiple heating steam supply flow conditions.

5. The flow control method of the heating steam supply regulating valve of the heating unit according to claim 4, characterized in that: The characteristic flow coefficient F of the heating steam supply regulating valve CNCV(i) for: When P DHin(i) ≥Kcr×P IPexh(i) hour, When P DHin(i) <KCr×P IPexh(i) hour, F CNCV(i) =F CN(i) ; Among them, F CN(i) is the heating steam flow rate of the i-th heating steam supply, P IPexh(i) is the exhaust steam pressure of the intermediate pressure cylinder of the i-th heating steam supply, P DHin(i) is the steam inlet pressure of the i-th heating network heater for heating steam supply, and Kcr is the critical pressure ratio of superheated steam.

6. The flow control method of the heating steam supply regulating valve of the heating unit according to claim 1, characterized in that: The determining of the opening of the connecting pipe heating regulating butterfly valve corresponding to the predetermined adjustment amount of the heating extraction steam flow rate based on the first characteristic curve and the corrected characteristic flow coefficient of the connecting pipe heating regulating butterfly valve comprises: Based on the low-pressure cylinder steam inlet pressure under normal heating operation conditions of the target heating unit, the corresponding low-pressure cylinder steam inlet flow rate is calculated; Calculate the characteristic flow coefficient of the connecting pipe heating regulating butterfly valve corresponding to the heating extraction steam flow regulation, and the characteristic flow coefficient of the connecting pipe heating regulating butterfly valve corrected to the test state; Based on the first characteristic curve and the characteristic flow coefficient of the connecting pipe heating regulating butterfly valve corrected to the test state, the opening of the connecting pipe heating regulating butterfly valve corresponding to the predetermined adjustment amount of the heating steam extraction flow is determined.

7. The flow control method of the heating steam supply regulating valve of the heating unit according to claim 6, characterized in that: The corresponding characteristic flow coefficient F of the connecting pipe heating regulating butterfly valve after the heating extraction steam flow is adjusted IPLPCVnew The formula for determining ′ is: When p′ LPinnew ≥Kcr×P IPexh 'hour, When p′ LPinnew <Kcr×p IPexh 'hour, F IPLPCVnew ′=F LP ′; Corrected to the characteristic flow coefficient F of the connecting pipe heating regulating butterfly valve under the test state IPLPCVCor 'for: Among them, p′ LPinnew is the steam inlet pressure of the low-pressure cylinder after the heating extraction steam flow is adjusted, Kcr is the critical pressure ratio of superheated steam, p IPexh ′ is the exhaust steam pressure of the intermediate pressure cylinder during normal heating operation, F LP ′ is the steam flow rate of the low-pressure cylinder during normal heating operation, p ipex-set is the setting value for all test conditions.

8. The flow control method of the heating steam supply regulating valve of the heating unit according to claim 1, characterized in that: The method of determining the opening of the heating steam supply regulating valve corresponding to the predetermined adjustment amount of the heating steam extraction flow rate based on the second characteristic curve and the corrected heating steam supply regulating valve characteristic flow coefficient includes: Determine the outlet temperature of the new heating network heater according to the circulating water volume of the heating network and the adjustment amount of the heating extraction steam flow under the normal heating operation condition of the target heating unit; Based on the new outlet temperature of the heating network heater, determine the characteristic flow coefficient of the heating steam supply regulating valve corresponding to the heating extraction steam flow rate adjustment, and the characteristic flow coefficient of the heating steam supply regulating valve corrected to the test state; Based on the second characteristic curve and the corrected characteristic flow coefficient of the heating steam supply regulating valve, the opening of the heating steam supply regulating valve corresponding to the predetermined adjustment amount of the heating steam extraction flow is determined.

9. The flow control method of the heating steam supply regulating valve of the heating unit according to claim 8, characterized in that: The heating steam supply regulating valve characteristic flow coefficient F corresponding to the heating steam extraction flow rate is CNCVnew The formula for determining ′ is: When p DHinnew ′≥Kcr×p IPexh 'hour, When p DHinnew ′<Kcr×p IPexh 'hour, F CNCVnew ′=F CNnew ′; The characteristic flow coefficient F of the heating steam supply regulating valve corrected to the test state CNCVCor The formula for determining ′ is: Among them, p DHinnew ′ is the steam inlet pressure of the heating network heater after the heating extraction steam flow is adjusted, Kcr is the critical pressure ratio of superheated steam, p IPexh ′ is the exhaust steam pressure of the intermediate pressure cylinder in normal heating operation, F CNnew ′ is the heating steam flow after the heating extraction steam flow is adjusted, p ipex-set is the setting value for all test conditions.

10. A flow control device for a heating steam supply regulating valve of a heating unit, characterized in that: include: A first curve determination module, used to determine a first characteristic curve of a characteristic flow coefficient and an opening degree of a heat supply regulating butterfly valve of a connecting pipe; A second curve determination module, used to determine a second characteristic curve of the characteristic flow coefficient and the opening of the heating steam supply regulating valve; A first opening determination module is used to determine the opening of the connecting pipe heating regulating butterfly valve corresponding to the predetermined adjustment amount of the heating extraction steam flow rate based on the first characteristic curve and the corrected characteristic flow coefficient of the connecting pipe heating regulating butterfly valve; A second opening determination module is used to determine the opening of the heating steam supply regulating valve corresponding to the predetermined adjustment amount of the heating steam extraction flow rate based on the second characteristic curve and the corrected heating steam supply regulating valve characteristic flow coefficient; The final value determination module is used to determine the openings of the connecting pipe heating regulating butterfly valve and the heating steam supply regulating valve respectively based on the opening of the connecting pipe heating regulating butterfly valve corresponding to the predetermined adjustment amount of the heating steam extraction flow rate, the opening of the heating steam supply regulating valve corresponding to the predetermined adjustment amount of the heating steam extraction flow rate, and the preset range of openings.

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