Supercritical generator set feed water control method, system, equipment and program product

Abstract

The invention provides a water supply control method, system and device of a supercritical generator set and a program product. The method comprises the steps of obtaining set starting data; responding to the condition that the unit starting data meets the starting stage switching condition, and switching the current starting stage to the next starting stage; an opening degree calculation function, matched with the current starting stage, of the water supply bypass adjusting valve is obtained, and the target opening degree of the water supply bypass adjusting valve is obtained through calculation according to the opening degree calculation function and the boiler combustion rate; and the opening degree of a water supply bypass adjusting valve is controlled to be the target opening degree, and the start-stop state of a water supply main path water inlet valve is controlled according to the current start stage. By dividing the unit starting stages and establishing the dynamic coupling relation between the boiler combustion rate and the water supply bypass regulating valve opening degree, accurate matching of the fuel amount and the water supply amount is achieved, the water supply bypass regulating valve opening degree can be automatically adjusted according to the real-time operation working condition of the unit, the starting time is shortened, the starting cost is reduced, and the starting efficiency is improved. And meanwhile, the automation and intelligence level is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of ultra (ultra)-supercritical thermal power generation units, and particularly to a feed water control method, system, device and program product for an ultra-supercritical power generation unit. Background Art

[0002] Since the start-up of an ultra (ultra)-supercritical thermal power generation unit is a multi-system, multi-variable, strongly coupled and non-linear process, the opening degree of the feed water bypass regulating valve is often manually set by the operator according to past experience and cannot be adjusted in time according to the real-time operating conditions of the unit. On the one hand, it cannot meet the requirements of modern thermal power generation automation and intelligent technologies; on the other hand, it will also prolong the unit start-up time, increase the steam consumption and fuel consumption, and instead increase the start-up cost. Summary of the Invention

[0003] The technical problem to be solved by the present disclosure is to overcome the above-mentioned defects in the prior art and provide a feed water control method, system, device and program product for an ultra-supercritical power generation unit.

[0004] The present disclosure solves the above technical problem through the following technical solutions:

[0005] The present disclosure provides a feed water control method for an ultra-supercritical power generation unit, and the feed water control method includes:

[0006] Obtain unit start-up data;

[0007] In response to the unit start-up data satisfying the condition for switching the start-up stage, switch the current start-up stage to the next start-up stage;

[0008] Obtain an opening degree calculation function of a feed water bypass regulating valve matching the current start-up stage, and calculate a target opening degree of the feed water bypass regulating valve according to the opening degree calculation function and the boiler combustion rate; the unit start-up data includes the boiler combustion rate;

[0009] Control the opening degree of the feed water bypass regulating valve to be the target opening degree, and control the start-stop state of the feed water main path inlet valve according to the current start-up stage.

[0010] Optionally, the unit start-up data further includes the number of oil guns put into use;

[0011] The step of, in response to the unit start-up data satisfying the condition for switching the start-up stage, switching the current start-up stage to the next start-up stage includes:

[0012] When the current start-up stage is the boiler water filling stage, in response to the boiler combustion rate being greater than or equal to a preset first combustion rate threshold and the number of oil guns put into use being greater than or equal to a preset first quantity threshold, switch the current start-up stage to the oil gun ignition stage;

[0013] The opening degree calculation function includes: a first opening degree calculation function that matches the oil gun ignition stage;

[0014] Calculating the target opening degree of the feed water bypass regulating valve according to the opening degree calculation function and the boiler combustion rate includes:

[0015] During the oil gun ignition stage, calculating the target opening degree according to the first opening degree calculation function and the boiler combustion rate;

[0016] Controlling the start-stop state of the main feed water inlet valve according to the current start-up stage includes:

[0017] During the boiler water filling stage and the oil gun ignition stage, controlling the main feed water inlet valve to be in the closed state.

[0018] Optionally, the unit start-up data further includes the number of operating coal mills;

[0019] Responding to the unit start-up data satisfying the condition for switching the start-up stage and switching the current start-up stage to the next start-up stage further includes:

[0020] When the current start-up stage is the oil gun ignition stage, in response to the boiler combustion rate being greater than or equal to a preset second combustion rate threshold and the number of operating coal mills being greater than or equal to a preset second quantity threshold, the current start-up stage is switched to the coal mill commissioning stage; wherein, the second combustion rate threshold is greater than the first combustion rate threshold;

[0021] The opening degree calculation function further includes: a second opening degree calculation function that matches the coal mill commissioning stage;

[0022] Calculating the target opening degree of the feed water bypass regulating valve according to the opening degree calculation function and the boiler combustion rate further includes:

[0023] During the coal mill commissioning stage, calculating the target opening degree according to the second opening degree calculation function and the boiler combustion rate;

[0024] Controlling the start-stop state of the main feed water inlet valve according to the current start-up stage further includes:

[0025] During the coal mill commissioning stage, controlling the main feed water inlet valve to be in the closed state.

[0026] Optionally, the unit start-up data further includes the unit grid-connected operation load;

[0027] Responding to the unit start-up data satisfying the condition for switching the start-up stage and switching the current start-up stage to the next start-up stage further includes:

[0028] When the current startup stage is the stage of putting the coal mill into use, in response to the boiler combustion rate being greater than or equal to a preset third combustion rate threshold and the grid-connected operation load of the unit being greater than or equal to a preset load threshold, the current startup stage switches to the grid-connected load increase stage of the unit; wherein, the third combustion rate threshold is greater than the second combustion rate threshold;

[0029] The opening calculation function further includes: a third opening calculation function matching the grid-connected load increase stage of the unit;

[0030] The step of calculating the target opening of the feed water bypass regulating valve according to the opening calculation function and the boiler combustion rate further includes:

[0031] When in the grid-connected load increase stage of the unit, calculating the target opening according to the third opening calculation function and the boiler combustion rate;

[0032] The step of controlling the start-stop state of the feed water main path inlet valve according to the current startup stage further includes:

[0033] When in the grid-connected load increase stage of the unit, controlling the feed water main path inlet valve to be in a closed state.

[0034] Optionally, the unit startup data further includes the differential pressure between the inlet and outlet of the economizer;

[0035] The step of switching the current startup stage to the next startup stage in response to the unit startup data meeting the switching startup stage condition further includes:

[0036] When the current startup stage is the grid-connected load increase stage of the unit, in response to the boiler combustion rate being greater than or equal to a preset fourth combustion rate threshold and the differential pressure between the inlet and outlet of the economizer being less than a preset differential pressure threshold, the current startup stage switches to the fully open throttle stage; wherein, the fourth combustion rate threshold is greater than the third combustion rate threshold;

[0037] The opening calculation function further includes: a fourth opening calculation function matching the fully open throttle stage;

[0038] The step of calculating the target opening of the feed water bypass regulating valve according to the opening calculation function and the boiler combustion rate further includes:

[0039] When in the fully open throttle stage, calculating the target opening according to the fourth opening calculation function and the boiler combustion rate so that the opening of the feed water bypass regulating valve gradually opens to 100%;

[0040] The step of controlling the start-stop state of the feed water main path inlet valve according to the current startup stage further includes:

[0041] When in the stage of fully opening the governing valve and after the opening of the feed water bypass regulating valve reaches 100%, control the feed water main path inlet valve to be in the open state and gradually open the opening to 100% according to a preset main path valve opening function.

[0042] Optionally, before the step of switching the current start-up stage to the next start-up stage in response to the unit start-up data satisfying the switching start-up stage conditions, the feed water control method further includes:

[0043] In response to satisfying the preconditions, set the current start-up stage to the boiler water filling stage.

[0044] Optionally, the preconditions include all of the following:

[0045] There is a furnace fire signal;

[0046] The unit feed water control system is set to the automatic input mode;

[0047] The pressure of the feed water tank is greater than or equal to a preset first pressure threshold, and one of at least two motor-driven feed water pumps is selected as the target motor-driven feed water pump to provide hydrodynamic force for the feed water bypass, and the outlet pressure of the target motor-driven feed water pump is greater than or equal to a preset second pressure threshold, and the actual feed water flow rate of the target motor-driven feed water pump is greater than or equal to a preset first flow rate threshold.

[0048] Optionally, the feed water control method further includes:

[0049] Obtain a rate threshold for the opening of the feed water bypass regulating valve that matches the current start-up stage;

[0050] Control the change rate of the opening of the feed water bypass regulating valve to be less than the rate threshold;

[0051] And / or,

[0052] The feed water control method further includes:

[0053] In response to the actual feed water flow rate of the target motor-driven feed water pump being greater than or equal to a preset second flow rate threshold, keep the current opening of the feed water bypass regulating valve unchanged.

[0054] The present disclosure also provides a feed water control system for a supercritical generating unit, and the feed water control system includes: an acquisition module, a phased processing module, and a valve opening control module;

[0055] The acquisition module is used to acquire unit start-up data;

[0056] The phased processing module is used to switch the current startup phase to the next startup phase in response to the unit startup data satisfying the switching startup phase condition;

[0057] The valve opening control module is used to obtain an opening calculation function of the feed water bypass regulating valve matching the current startup phase, and calculate the target opening of the feed water bypass regulating valve according to the opening calculation function and the boiler combustion rate; the unit startup data includes the boiler combustion rate;

[0058] The valve opening control module is further used to control the opening of the feed water bypass regulating valve to be the target opening, and control the start-stop state of the main feed water inlet valve according to the current startup phase.

[0059] Optionally, the unit startup data further includes the number of oil guns put into use;

[0060] The phased processing module is further used to, when the current startup phase is the boiler water filling phase, in response to the boiler combustion rate being greater than or equal to a preset first combustion rate threshold and the number of oil guns put into use being greater than or equal to a preset first quantity threshold, switch the current startup phase to the oil gun ignition phase;

[0061] The opening calculation function includes: a first opening calculation function matching the oil gun ignition phase;

[0062] The valve opening control module is further used to, during the oil gun ignition phase, calculate the target opening according to the first opening calculation function and the boiler combustion rate;

[0063] The valve opening control module is further used to control the main feed water inlet valve to be in a closed state during the boiler water filling phase and the oil gun ignition phase.

[0064] Optionally, the unit startup data further includes the number of operating coal mills;

[0065] The phased processing module is further used to, when the current startup phase is the oil gun ignition phase, in response to the boiler combustion rate being greater than or equal to a preset second combustion rate threshold and the number of operating coal mills being greater than or equal to a preset second quantity threshold, switch the current startup phase to the coal mill commissioning phase; wherein, the second combustion rate threshold is greater than the first combustion rate threshold;

[0066] The opening calculation function further includes: a second opening calculation function matching the coal mill commissioning phase;

[0067] The valve opening control module is further used to, during the coal mill commissioning phase, calculate the target opening according to the second opening calculation function and the boiler combustion rate;

[0068] The valve opening control module is further configured to control the water inlet valve of the main water supply path to be in a closed state during the commissioning stage of the coal mill.

[0069] Optionally, the unit startup data further includes the unit grid-connected operation load;

[0070] When the current startup stage is the commissioning stage of the coal mill, the phased processing module is further configured to switch the current startup stage to the unit grid-connected load increasing stage in response to the boiler combustion rate being greater than or equal to a preset third combustion rate threshold and the unit grid-connected operation load being greater than or equal to a preset load threshold; wherein, the third combustion rate threshold is greater than the second combustion rate threshold;

[0071] The opening calculation function further includes: a third opening calculation function matching the unit grid-connected load increasing stage;

[0072] During the unit grid-connected load increasing stage, the valve opening control module is further configured to calculate the target opening according to the third opening calculation function and the boiler combustion rate;

[0073] During the unit grid-connected load increasing stage, the valve opening control module is further configured to control the water inlet valve of the main water supply path to be in a closed state.

[0074] Optionally, the unit startup data further includes the differential pressure between the inlet and outlet of the economizer;

[0075] When the current startup stage is the unit grid-connected load increasing stage, the phased processing module is further configured to switch the current startup stage to the stage of fully opening the regulating valve in response to the boiler combustion rate being greater than or equal to a preset fourth combustion rate threshold and the differential pressure between the inlet and outlet of the economizer being less than a preset differential pressure threshold; wherein, the fourth combustion rate threshold is greater than the third combustion rate threshold;

[0076] The opening calculation function further includes: a fourth opening calculation function matching the stage of fully opening the regulating valve;

[0077] During the stage of fully opening the regulating valve, the valve opening control module is further configured to calculate the target opening according to the fourth opening calculation function and the boiler combustion rate, so that the opening of the feed water bypass regulating valve is gradually opened to 100%;

[0078] During the stage of fully opening the regulating valve and after the opening of the feed water bypass regulating valve reaches 100%, the valve opening control module is further configured to control the water inlet valve of the main water supply path to be in an open state and gradually open the opening to 100% according to a preset main path valve opening function.

[0079] Optionally, the feed water control system further includes: a pre-response module;

[0080] The pre-response module is configured to, in response to meeting a pre-condition, set the current startup stage to the boiler water filling stage.

[0081] Optionally, the pre-condition includes all of the following:

[0082] There is a signal indicating fire in the furnace;

[0083] The unit feed water control system is set to the automatic input mode;

[0084] The pressure of the feed water tank is greater than or equal to a preset first pressure threshold, and one of at least two motor-driven feed water pumps is selected as the target motor-driven feed water pump to provide hydrodynamic power for the feed water bypass, and the outlet pressure of the target motor-driven feed water pump is greater than or equal to a preset second pressure threshold, and the actual feed water flow rate of the target motor-driven feed water pump is greater than or equal to a preset first flow rate threshold.

[0085] Optionally, the feed water control system further includes: a protection and limitation module;

[0086] The protection and limitation module is configured to obtain a rate threshold for the opening degree of the feed water bypass regulating valve that matches the current startup stage;

[0087] The protection and limitation module is further configured to control the change rate of the opening degree of the feed water bypass regulating valve to be less than the rate threshold;

[0088] And / or

[0089] Optionally, the feed water control system further includes: a protection and limitation module;

[0090] The protection and limitation module is configured to, in response to the actual feed water flow rate of the target motor-driven feed water pump being greater than or equal to a preset second flow rate threshold, keep the current opening degree of the feed water bypass regulating valve unchanged.

[0091] The present disclosure also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and configured to run on the processor. When the processor executes the computer program, the water supply control method of the supercritical generator set described above is implemented.

[0092] The present disclosure also provides a computer program product, including a computer program. When the computer program is executed by a processor, the water supply control method of the supercritical generator set described above is implemented.

[0093] On the basis of conforming to common general knowledge in the art, the above preferred conditions can be combined arbitrarily to obtain various preferred examples of the present disclosure.

[0094] The positive and progressive effects of the present disclosure are as follows: By dividing the unit startup stage and establishing a dynamic coupling relationship (opening calculation function) between the boiler combustion rate and the opening of the feed water bypass regulating valve, combined with the boundary condition constraints of multi-parameters in stages, the precise matching of the fuel quantity and the feed water quantity is achieved. It can automatically adjust the opening of the feed water bypass regulating valve according to the real-time operating conditions of the unit, and after the feed water bypass regulating valve is fully opened, control the main feed water inlet valve to gradually open to the full open state, switch the control mode of the motor-driven feed water pump from the pressure control mode to the flow control mode, complete the unit startup, significantly shorten the startup time, reduce the startup cost, and at the same time improve the automation and intelligent level of the thermal power unit startup process. BRIEF DESCRIPTION OF THE DRAWINGS

[0095] Figure 1 It is a flowchart of a feed water control method for a supercritical generator set provided in Embodiment 1 of the present disclosure;

[0096] Figure 2 It is a flowchart of a specific implementation manner of a feed water control method for a supercritical generator set provided in Embodiment 1 of the present disclosure;

[0097] Figure 3 It is a flowchart of another specific implementation manner of a feed water control method for a supercritical generator set provided in Embodiment 1 of the present disclosure;

[0098] Figure 4 It is a flowchart of another specific implementation manner of a feed water control method for a supercritical generator set provided in Embodiment 1 of the present disclosure;

[0099] Figure 5 It is a flowchart of another specific implementation manner of a feed water control method for a supercritical generator set provided in Embodiment 1 of the present disclosure;

[0100] Figure 6 It is a flowchart of another specific implementation manner of a feed water control method for a supercritical generator set provided in Embodiment 1 of the present disclosure;

[0101] Figure 7 It is a schematic diagram of the control principle of an example of a feed water control method for a supercritical generator set provided in Embodiment 1 of the present disclosure;

[0102] Figure 8 It is a schematic diagram of the modules of a feed water control system for a supercritical generator set provided in Embodiment 2 of the present disclosure;

[0103] Figure 9 It is a schematic diagram of the structure of an electronic device provided in Embodiment 3 of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0104] The present disclosure will be further described below by way of examples, but the present disclosure is not limited to the scope of the described examples for this reason.

[0105] In the embodiments of the present disclosure, prefix words such as "first" and "second" are only used to distinguish different described objects, and have no limiting effect on the position, order, priority, quantity, content, etc. of the described objects. The use of ordinal numbers and other prefix words for distinguishing described objects in the embodiments of the present disclosure does not constitute a limitation on the described objects. The statement of the described objects refers to the description in the context of the claims or embodiments, and should not constitute an unnecessary limitation due to the use of such prefix words. In addition, in the description of this embodiment, unless otherwise specified, the meaning of "a plurality" is two or more.

[0106] Embodiment 1

[0107] Figure 1 It is a flowchart of a feedwater control method for a supercritical generator set provided in an exemplary embodiment of the present disclosure. The feedwater control method includes:

[0108] S11. Obtain the unit startup data.

[0109] S12. In response to the unit startup data satisfying the switching startup stage condition, switch the current startup stage to the next startup stage.

[0110] S13. Obtain the opening calculation function of the feedwater bypass regulating valve matching the current startup stage, and calculate the target opening of the feedwater bypass regulating valve according to the opening calculation function and the boiler combustion rate. The unit startup data includes the boiler combustion rate.

[0111] S14. Control the opening of the feedwater bypass regulating valve to the target opening, and control the start-stop state of the feedwater main path inlet valve according to the current startup stage.

[0112] Among them, to meet the requirements of energy conservation and consumption reduction and reduce the plant power consumption rate during the unit startup stage, at present, ultra (super) critical thermal power units have realized the "single steam feed pump startup mode" to replace the original "motor-driven feed pump startup mode". In the "single steam feed pump startup mode", by borrowing auxiliary steam from the adjacent boiler to rotate the steam-driven feed pump and supply feedwater to the boiler. At this time, the feedwater pressure is automatically controlled by the steam-driven feed pump, and the feedwater flow is manually controlled by the operator setting the opening of the feedwater bypass regulating valve. Until the unit is synchronized and the load is increased, the feedwater bypass regulating valve is fully opened, the feedwater main path inlet valve (feedwater main valve) is put into operation, and the steam-driven feed pump is switched from the pressure control mode to the flow control mode, and the unit completes startup.

[0113] The feed water control method in this embodiment is applied to the entire unit startup stage of a super (ultra-super) critical thermal power unit. By effectively grasping the demarcation points during the unit startup process, the entire process is divided into 5 stages: "boiler water filling", "oil gun ignition", "coal mill commissioning", "unit grid connection and load increase", and "valve full open". Each stage is triggered and switched by key signals (such as oil fire detection intensity signal, coal mill operation signal, unit load signal, economizer inlet and outlet differential pressure signal, etc.). The system dynamically identifies the current stage by selecting processing links in stages, and comprehensively determines whether the preconditions for the bypass regulating valve to be put into automatic control are met based on preset multi-parameter boundary conditions (such as feed water tank pressure, outlet pressure of the startup pump (i.e., steam-driven feed water pump), actual feed water flow, boiler combustion rate, etc.).

[0114] According to the combustion characteristics of the boiler in each stage, the boiler combustion rate and the opening of the feed water bypass regulating valve are correlated and coupled to obtain the corresponding opening calculation function, dynamically associating the boiler combustion rate with the feed water demand, and establishing a parameter mapping relationship between the boiler combustion characteristics and the feed water bypass; and each stage is constrained by multi-parameter boundary conditions, and the opening calculation functions of each stage are more in line with the actual situation, realizing the coordinated matching of the fuel quantity and the feed water quantity, achieving the effect that the feed water bypass regulating valve automatically adjusts according to the real-time operating conditions of the unit, not only meeting the requirements of modern thermal power generation automation and intelligent technologies, but also shortening the unit startup time, reducing the steam consumption and fuel quantity, and further reducing the startup cost.

[0115] The opening calculation function can be obtained by fitting historical data. The opening calculation function of the feed water bypass regulating valve matching the current startup stage only needs to be obtained once, and this opening calculation function is continuously used to calculate the target opening in the case of no switching in the current startup stage.

[0116] In this embodiment, by dividing the unit startup stage and establishing a dynamic coupling relationship (opening calculation function) between the boiler combustion rate and the opening of the feed water bypass regulating valve, combined with the multi-parameter staged boundary condition constraints, the accurate matching of the fuel quantity and the feed water quantity is realized, the opening of the feed water bypass regulating valve can be automatically adjusted according to the real-time operating conditions of the unit, and after the feed water bypass regulating valve is fully open, the control valve of the main feed water path is gradually opened to full open, and the control mode of the steam-driven feed water pump is switched from the pressure control mode to the flow control mode to complete the unit startup, significantly shortening the startup time, reducing the startup cost, and at the same time improving the automation and intelligent level of the thermal power unit startup process.

[0117] In one embodiment, the unit startup data further includes the number of oil guns put into use.

[0118] Refer to Figure 2 , step S12 includes:

[0119] S121. When it is the boiler water filling stage in the current startup phase, in response to the boiler combustion rate being greater than or equal to a preset first combustion rate threshold and the number of oil guns put into use being greater than or equal to a preset first quantity threshold, the current startup phase switches to the oil gun ignition stage.

[0120] The opening calculation function includes: a first opening calculation function matching the oil gun ignition stage.

[0121] Step S13 includes:

[0122] S131. When in the oil gun ignition stage, calculate the target opening according to the first opening calculation function and the boiler combustion rate.

[0123] Step S14 includes:

[0124] S141. Control the opening of the feed water bypass regulating valve to the target opening; and when in the boiler water filling stage and the oil gun ignition stage, control the feed water main path inlet valve to be in the closed state.

[0125] Among them, the first combustion rate threshold (a1%) and the first quantity threshold can be set according to the actual situation. For example: the first quantity threshold can be set to 8. When the boiler combustion rate ≥ a1% and the number of oil guns put into use ≥ 8, the unit startup enters the "oil gun ignition" stage from the "boiler water filling" stage.

[0126] In the oil gun ignition stage, the coupling function relationship between the opening of the feed water bypass regulating valve and the boiler combustion rate adopts the first opening calculation function F1(x). In this stage, the boiler combustion rate is relatively stable, and the change in the opening of the feed water bypass regulating valve is also relatively smooth.

[0127] In one embodiment, the unit startup data further includes the number of operating coal mills.

[0128] Refer to Figure 3 , step S12 further includes:

[0129] S122. When it is the oil gun ignition stage in the current startup phase, in response to the boiler combustion rate being greater than or equal to a preset second combustion rate threshold and the number of operating coal mills being greater than or equal to a preset second quantity threshold, the current startup phase switches to the coal mill put into use stage. Among them, the second combustion rate threshold is greater than the first combustion rate threshold.

[0130] The opening calculation function further includes: a second opening calculation function matching the coal mill put into use stage.

[0131] Step S13 includes:

[0132] S132. When in the coal mill put into use stage, calculate the target opening according to the second opening calculation function and the boiler combustion rate.

[0133] Step S14 includes:

[0134] S142. Control the opening of the feed water bypass regulating valve to the target opening; and when the coal mill is in the commissioning stage, control the main feed water inlet valve to be in the closed state.

[0135] Among them, the second combustion rate threshold (a2%) and the second quantity threshold can be set according to the actual situation, where a2 > a1. For example, the second quantity threshold can be set to 1 unit. When the boiler combustion rate ≥ a2% and at least one coal mill operation signal is received, the unit startup enters the "coal mill commissioning" stage from the "oil gun ignition" stage.

[0136] In the coal mill commissioning stage, the coupling function relationship between the opening of the feed water bypass regulating valve and the boiler combustion rate adopts the second opening calculation function F2(x). In this stage, the increase rate of the boiler combustion rate is significant. Moreover, when the number of coal mills in commissioning reaches 3 units and operates stably, the oil guns will gradually withdraw, and at this time, the boiler combustion rate will show obvious fluctuations. To ensure the stability of the feed water, the engineering setting value in the second opening calculation function F2(x) becomes particularly critical.

[0137] In one embodiment, the unit startup data further includes the unit grid-connected operation load.

[0138] Refer to Figure 4 , step S12 further includes:

[0139] S123. When the current startup stage is the coal mill commissioning stage, in response to the boiler combustion rate being greater than or equal to the preset third combustion rate threshold and the unit grid-connected operation load being greater than or equal to the preset load threshold, the current startup stage switches to the unit grid-connected load increasing stage. Among them, the third combustion rate threshold is greater than the second combustion rate threshold.

[0140] The opening calculation function further includes: a third opening calculation function matching the unit grid-connected load increasing stage.

[0141] Step S13 includes:

[0142] S133. In the unit grid-connected load increasing stage, calculate the target opening according to the third opening calculation function and the boiler combustion rate.

[0143] Step S14 includes:

[0144] S143. Control the opening of the feed water bypass regulating valve to the target opening; and when the unit is in the grid-connected load increasing stage, control the main feed water inlet valve to be in the closed state.

[0145] Among them, the third combustion rate threshold (a3%) and the load threshold can be set according to the actual situation, where a3 > a2. For example, the load threshold can be set to P megawatts. When the boiler combustion rate ≥ a3% and the unit grid-connected operation load ≥ P megawatts, the unit startup enters the "unit grid-connected load increase" stage from the "coal mill put into use" stage.

[0146] In the unit grid-connected load increase stage, the coupling function relationship between the opening of the feed water bypass regulating valve and the boiler combustion rate adopts the third opening calculation function F3(x). In this stage, the pressure inside the furnace heating surface pipes has gradually increased, and part of the feed water has formed superheated steam and entered the steam turbine to do work, converting thermal energy into mechanical energy. The boiler combustion rate increases slowly, and the change in the opening of the feed water bypass regulating valve is relatively stable.

[0147] In one embodiment, the unit startup data further includes the differential pressure between the inlet and outlet of the economizer.

[0148] Refer to Figure 5 , step S12 further includes:

[0149] S124. When the current startup stage is the unit grid-connected load increase stage, in response to the boiler combustion rate being greater than or equal to the preset fourth combustion rate threshold and the differential pressure between the inlet and outlet of the economizer being less than the preset differential pressure threshold, the current startup stage switches to the full-open valve stage. Among them, the fourth combustion rate threshold is greater than the third combustion rate threshold.

[0150] The opening calculation function further includes: a fourth opening calculation function matching the full-open valve stage.

[0151] Step S13 includes:

[0152] S134. In the full-open valve stage, calculate the target opening according to the fourth opening calculation function and the boiler combustion rate, so that the opening of the feed water bypass regulating valve is gradually opened to 100%.

[0153] Step S14 includes:

[0154] S144. Control the opening of the feed water bypass regulating valve to the target opening; and when in the full-open valve stage and after the opening of the feed water bypass regulating valve reaches 100%, control the feed water main road inlet valve to be in the open state and control the opening to be gradually opened to 100% according to the preset main road valve opening function.

[0155] Among them, the fourth combustion rate threshold (a4%) and the differential pressure threshold can be set according to the actual situation, where a4 > a3. For example, the differential pressure threshold can be set to 1 MPa. When the boiler combustion rate ≥ a4% and the differential pressure between the inlet and outlet of the economizer < 1 MPa, the unit startup enters the "full-open valve" stage from the "unit grid-connected load increase" stage.

[0156] During the full - open stage of the governing valve, the coupling function relationship between the opening of the feed - water bypass regulating valve and the boiler combustion rate adopts the fourth - opening calculation function F4(x). During this stage, the heat exchange between the media in the boiler heating surfaces remains balanced, the boiler combustion rate has been stabilized, the opening of the feed - water bypass regulating valve can be opened to 100% at a certain rate, and then the main - line feed - water inlet valve is gradually opened to full - open. The start - up feed - water pump is switched from the pressure - control mode to the flow - control mode. Thus, the unit completes the start - up.

[0157] In one embodiment, before step S12, the feed - water control method further includes:

[0158] In response to meeting the pre - conditions, the current start - up stage is set to the boiler water - filling stage.

[0159] In one embodiment, the pre - conditions include all of the following:

[0160] There is a fire signal in the furnace.

[0161] The unit's feed - water control system is set to the automatic - input mode.

[0162] The pressure of the feed - water tank is greater than or equal to a preset first pressure threshold, and one of at least two motor - driven feed - water pumps is selected as the target motor - driven feed - water pump to provide hydrodynamic force for the feed - water bypass, and the outlet pressure of the target motor - driven feed - water pump is greater than or equal to a preset second pressure threshold, and the actual feed - water flow rate of the target motor - driven feed - water pump is greater than or equal to a preset first flow - rate threshold.

[0163] In one embodiment, referring to Figure 6 , the feed - water control method further includes:

[0164] S21. Obtain the rate threshold of the opening of the feed - water bypass regulating valve that matches the current start - up stage.

[0165] S22. Control the change rate of the opening of the feed - water bypass regulating valve to be less than the rate threshold.

[0166] In this embodiment, the change rate of the opening of the feed - water bypass regulating valve is protected and restricted to prevent the sudden change of the opening of the feed - water bypass regulating valve.

[0167] In one embodiment, the feed - water control method further includes:

[0168] In response to the actual feed - water flow rate of the target motor - driven feed - water pump being greater than or equal to a preset second flow - rate threshold, keep the current opening of the feed - water bypass regulating valve unchanged.

[0169] Among them, the second flow - rate threshold may be equal to or different from the first flow - rate threshold.

[0170] The second flow - rate threshold can be set according to the actual situation.

[0171] In one embodiment, the feed water control method further includes:

[0172] By configuring an automatic / manual seamless switching interface to achieve two-way switching of the control mode.

[0173] The following is an example of the feed water control method applied to a super (ultra)-critical generating unit, as Figure 7 shown. In the figure, the steam pump and the start-up pump both refer to the steam-driven feed water pump, and the command refers to the command for controlling the opening of the regulating valve.

[0174] By effectively grasping the demarcation point in the unit startup process, the whole process is divided into 5 stages: "boiler water filling", "oil gun ignition", "coal mill commissioning", "unit grid connection and load increase", and "fully open throttle valve".

[0175] (1) Boiler water filling treatment link

[0176] When the preconditions are met, the unit startup enters the "boiler water filling" stage.

[0177] The preconditions include all of the following:

[0178] There is a fire signal in the furnace.

[0179] The unit feed water control system is set to the automatic input mode.

[0180] The pressure of the feed water tank is greater than or equal to a preset first pressure threshold, and one of at least two steam-driven feed water pumps is selected as the target steam-driven feed water pump to provide hydrodynamic power for the feed water bypass, and the outlet pressure of the target steam-driven feed water pump is greater than or equal to a preset second pressure threshold, and the actual feed water flow of the target steam-driven feed water pump is greater than or equal to a preset first flow threshold (i.e., the right boundary condition of the steam pump).

[0181] (2) Oil gun commissioning treatment link

[0182] When the boiler combustion rate ≥ a1% and the number of oil guns put into use ≥ 8, after logical judgment, the unit startup enters the "oil gun ignition" stage from the "boiler water filling" stage, and the command of the feed water bypass regulating valve and the boiler combustion rate setting form a coupling function F1(x) relationship. In this stage, the boiler combustion rate is relatively stable, and the change of the command of the feed water bypass regulating valve is also relatively smooth.

[0183] (3) Coal mill commissioning treatment link

[0184] When the boiler combustion rate ≥ a2% and at least one coal mill operation signal is received, after logical judgment, the unit starts to enter the "coal mill in use" stage from the "oil gun ignition" stage, and the instruction of the feed water bypass regulating valve is set to a coupling function F2(x) relationship with the boiler combustion rate. In this stage, the increase rate of the boiler combustion rate is significant. Moreover, when the number of coal mills in use reaches 3 and operates stably, the oil guns will gradually withdraw. At this time, the boiler combustion rate will show obvious fluctuations. To ensure the stability of the feed water, the engineering setting value in the coupling function F2(x) becomes particularly crucial.

[0185] (4)Unit grid connection and load increase processing link

[0186] When the boiler combustion rate ≥ a3% and the unit grid connection operation load ≥ P MW, after logical judgment, the unit starts to enter the "unit grid connection and load increase" stage from the "coal mill in use" stage, and the instruction of the feed water bypass regulating valve is set to a coupling function F3(x) relationship with the boiler combustion rate. In this stage, the pressure inside the furnace heating surface pipes has gradually increased. Part of the feed water has formed superheated steam and entered the steam turbine to do work, converting thermal energy into mechanical energy. The boiler combustion rate increases slowly, and the change of the feed water bypass regulating valve instruction is relatively stable.

[0187] (5)Full opening of bypass regulating valve processing link

[0188] When the boiler combustion rate ≥ a4% and the differential pressure between the inlet and outlet of the economizer < 1 Mpa, after logical judgment, the unit starts to enter the "fully open regulating valve" stage from the "unit grid connection and load increase" stage. In this stage, the heat exchange of the medium between the boiler heating surfaces remains balanced, the boiler combustion rate has been stable, the instruction of the feed water bypass regulating valve can be opened to 100% at a certain rate (coupling function F4(x) relationship), and then the main feed water inlet valve is gradually opened to full open. The start-up steam pump is switched from the pressure control mode to the flow control mode. Thus, the unit completes the start-up.

[0189] In this example, the traditional time series control is transformed into phase control based on combustion characteristic parameters. By establishing a dynamic transfer model of boiler thermal parameters and hydraulic parameters, the feed water bypass regulating valve can track the energy conversion characteristics of the unit start-up process in real time. Compared with the existing technology, it solves the problems of lagging response and low regulation accuracy in manual control, and significantly improves the unit start-up efficiency and economy.

[0190] Embodiment 2

[0191] Corresponding to the foregoing embodiment of the feed water control method for a supercritical generating unit, the present disclosure also provides an embodiment of a feed water control system for a supercritical generating unit.

[0192] Figure 8A schematic diagram of modules of a feed water control system for a supercritical generator set provided by an exemplary embodiment of the present disclosure. The system includes: an acquisition module 1, a phased processing module 2, and a valve opening control module 3.

[0193] The acquisition module 1 is configured to acquire unit startup data.

[0194] The phased processing module 2 is configured to switch the current startup phase to the next startup phase in response to the unit startup data satisfying the condition for switching the startup phase.

[0195] The valve opening control module 3 is configured to acquire an opening calculation function of a feed water bypass regulating valve matching the current startup phase, and calculate a target opening of the feed water bypass regulating valve according to the opening calculation function and the boiler combustion rate. The unit startup data includes the boiler combustion rate.

[0196] The valve opening control module 3 is further configured to control the opening of the feed water bypass regulating valve to be the target opening, and control the start-stop state of the feed water main path inlet valve according to the current startup phase.

[0197] In this embodiment, by dividing the unit startup phase and establishing a dynamic coupling relationship (opening calculation function) between the boiler combustion rate and the opening of the feed water bypass regulating valve, combined with the boundary condition constraints of multi-parameter phased processing, the accurate matching of the fuel quantity and the feed water quantity is achieved. It can automatically adjust the opening of the feed water bypass regulating valve according to the real-time operating conditions of the unit, and after the feed water bypass regulating valve is fully opened, control the feed water main path inlet valve to gradually open to the full open state, switch the control mode of the steam-driven feed water pump from the pressure control mode to the flow control mode, complete the unit startup, significantly shorten the startup time, reduce the startup cost, and at the same time improve the automation and intelligent level of the startup process of the thermal power unit.

[0198] In one embodiment, the unit startup data further includes the number of oil guns put into use.

[0199] The phased processing module 2 is further configured to, when the current startup phase is the boiler water filling phase, switch the current startup phase to the oil gun ignition phase in response to the boiler combustion rate being greater than or equal to a preset first combustion rate threshold and the number of oil guns put into use being greater than or equal to a preset first quantity threshold.

[0200] The opening calculation function includes: a first opening calculation function matching the oil gun ignition phase.

[0201] The valve opening control module 3 is further configured to calculate the target opening according to the first opening calculation function and the boiler combustion rate during the oil gun ignition phase.

[0202] The valve opening control module 3 is further configured to control the feed water main path inlet valve to be in the closed state during the boiler water filling phase and the oil gun ignition phase.

[0203] In one embodiment, the unit startup data further includes the number of operating coal mills.

[0204] The phased processing module 2 is further configured to, when the current startup phase is the oil gun ignition phase, in response to the boiler combustion rate being greater than or equal to a preset second combustion rate threshold and the number of operating coal mills being greater than or equal to a preset second quantity threshold, switch the current startup phase to the coal mill commissioning phase. Wherein, the second combustion rate threshold is greater than the first combustion rate threshold.

[0205] The opening calculation function further includes: a second opening calculation function matching the coal mill commissioning phase.

[0206] The valve opening control module 3 is further configured to, during the coal mill commissioning phase, calculate the target opening according to the second opening calculation function and the boiler combustion rate.

[0207] The valve opening control module 3 is further configured to, during the coal mill commissioning phase, control the feed water main path inlet valve to be in a closed state.

[0208] In one embodiment, the unit startup data further includes the unit grid-connected operation load.

[0209] The phased processing module 2 is further configured to, when the current startup phase is the coal mill commissioning phase, in response to the boiler combustion rate being greater than or equal to a preset third combustion rate threshold and the unit grid-connected operation load being greater than or equal to a preset load threshold, switch the current startup phase to the unit grid-connected load increase phase. Wherein, the third combustion rate threshold is greater than the second combustion rate threshold.

[0210] The opening calculation function further includes: a third opening calculation function matching the unit grid-connected load increase phase.

[0211] The valve opening control module 3 is further configured to, during the unit grid-connected load increase phase, calculate the target opening according to the third opening calculation function and the boiler combustion rate.

[0212] The valve opening control module 3 is further configured to, during the unit grid-connected load increase phase, control the feed water main path inlet valve to be in a closed state.

[0213] In one embodiment, the unit startup data further includes the economizer inlet and outlet differential pressure.

[0214] The phased processing module 2 is further configured to, when the current startup phase is the unit grid-connected load increase phase, in response to the boiler combustion rate being greater than or equal to a preset fourth combustion rate threshold and the economizer inlet and outlet differential pressure being less than a preset differential pressure threshold, switch the current startup phase to the throttle valve fully open phase. Wherein, the fourth combustion rate threshold is greater than the third combustion rate threshold.

[0215] The opening calculation function further includes: a fourth opening calculation function matching the throttle valve fully open phase.

[0216] The valve opening control module 3 is also used to calculate the target opening according to the fourth opening calculation function and the boiler combustion rate during the full opening stage of the throttle valve, so that the opening of the feed water bypass regulating valve is gradually opened to 100%.

[0217] The valve opening control module 3 is also used to control the feed water main path inlet valve to be in the open state and gradually open the opening to 100% according to the preset main path valve opening function when the throttle valve is in the full opening stage and after the opening of the feed water bypass regulating valve reaches 100%.

[0218] In one embodiment, the feed water control system further includes: a pre-response module 4.

[0219] The pre-response module 4 is used to respond to the satisfaction of the pre-conditions and set the current start-up stage to the boiler water filling stage.

[0220] In one embodiment, the pre-conditions include all of the following:

[0221] There is a furnace fire signal.

[0222] The unit feed water control system is set to the automatic input mode.

[0223] The pressure of the feed water tank is greater than or equal to a preset first pressure threshold, and one of at least two motor-driven feed water pumps is selected as the target motor-driven feed water pump to provide hydrodynamic force for the feed water bypass, and the outlet pressure of the target motor-driven feed water pump is greater than or equal to a preset second pressure threshold, and the actual feed water flow of the target motor-driven feed water pump is greater than or equal to a preset first flow threshold.

[0224] In one embodiment, the feed water control system further includes: a protection and restriction module 5.

[0225] The protection and restriction module 5 is used to obtain the rate threshold of the opening of the feed water bypass regulating valve matching the current start-up stage.

[0226] The protection and restriction module 5 is also used to control the change rate of the opening of the feed water bypass regulating valve to be less than the rate threshold.

[0227] In one embodiment, the feed water control system further includes: a protection and restriction module 5.

[0228] The protection and restriction module 5 is used to keep the current opening of the feed water bypass regulating valve unchanged in response to the actual feed water flow of the target motor-driven feed water pump being greater than or equal to a preset second flow threshold.

[0229] For system embodiments, since they basically correspond to method embodiments, reference may be made to the relevant descriptions in the method embodiments. The system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present disclosure solution.

[0230] Embodiment 3

[0231] Figure 9 FIG. is a schematic structural diagram of an electronic device shown in an exemplary embodiment of the present disclosure. The electronic device includes a memory, a processor, and a computer program stored in the memory and configured to run on the processor. When the processor executes the computer program, it implements the feedwater control method of the supercritical generator set described in any of the above embodiments. Figure 9 The electronic device 90 shown is merely an example and should not impose any limitation on the functions and usage scope of the embodiments of the present disclosure.

[0232] As Figure 9 shown, the electronic device 90 may be presented in the form of a general-purpose computing device, for example, it may be a server device. The components of the electronic device 90 may include, but are not limited to: at least one of the above processors 91, at least one of the above memories 92, and a bus 93 connecting different system components (including the memory 92 and the processor 91).

[0233] The bus 93 includes a data bus, an address bus, and a control bus.

[0234] The memory 92 may include volatile memory, such as a random access memory (RAM) 921 and / or a cache memory 922, and may further include a read-only memory (ROM) 923.

[0235] The memory 92 may further include a program tool 925 (or utility) having a set of (at least one) program modules 924. Such program modules 924 include, but are not limited to: an operating system, one or more application programs, other program modules, and program data. The implementation of a network environment may be included in each or some combination of these examples.

[0236] The processor 91 executes various functional applications and data processing by running the computer program stored in the memory 92, such as the feedwater control method of the supercritical generator set provided in any of the above embodiments.

[0237] The electronic device 90 can also communicate with one or more external devices 94 (such as a keyboard, a pointing device, etc.). Such communication can be carried out through the input / output (I / O) interface 95. Moreover, the electronic device 90 can also communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN) and / or a public network, such as the Internet) through the network adapter 96. As shown in the figure, the network adapter 96 communicates with other modules of the electronic device 90 through the bus 93. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in combination with the electronic device 90, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (Redundant Array of Independent Disks) systems, tape drives, and data backup storage systems, etc.

[0238] It should be noted that, although several units / modules or sub-units / modules of the electronic device are mentioned in the above detailed description, this division is merely exemplary and not mandatory. In fact, according to the embodiments of the present disclosure, the features and functions of two or more of the above-mentioned units / modules can be embodied in one unit / module. Conversely, the features and functions of one unit / module described above can be further divided and embodied by multiple units / modules.

[0239] Embodiment 4

[0240] The embodiments of the present disclosure also provide a computer program product, including a computer program, and when the computer program is executed by a processor, it implements the feed water control method of the supercritical generator set described in any one of the above.

[0241] Among them, the program code for executing the computer program product of the present disclosure can be written in any combination of one or more programming languages. The program code can be executed entirely on the user device, partially on the user device, executed as an independent software package, partially on the user device and partially on a remote device, or entirely on a remote device.

[0242] Although the specific embodiments of the present disclosure are described above, those skilled in the art should understand that this is only for illustration, and the protection scope of the present disclosure is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present disclosure, but these changes and modifications all fall within the protection scope of the present disclosure.

Claims

1. A feed water control method for a supercritical power generation unit, characterized in that The described feed water control method includes: Obtaining unit startup data; In response to the unit startup data satisfying the conditions for switching the startup stage, switching the current startup stage to the next startup stage; Obtaining an opening calculation function of the feed water bypass regulating valve matching the current startup stage, and calculating the target opening of the feed water bypass regulating valve according to the opening calculation function and the boiler combustion rate; the unit startup data includes the boiler combustion rate; Controlling the opening of the feed water bypass regulating valve to be the target opening, and controlling the start-stop state of the feed water main path inlet valve according to the current startup stage.

2. The feed water control method of the supercritical generator set according to claim 1, characterized in that The unit startup data further includes the number of oil guns put into use; The step of, in response to the unit startup data satisfying the conditions for switching the startup stage, switching the current startup stage to the next startup stage, includes: When the current startup stage is the boiler water filling stage, in response to the boiler combustion rate being greater than or equal to a preset first combustion rate threshold and the number of oil guns put into use being greater than or equal to a preset first quantity threshold, switching the current startup stage to the oil gun ignition stage; The opening calculation function includes: a first opening calculation function matching the oil gun ignition stage; The step of calculating the target opening of the feed water bypass regulating valve according to the opening calculation function and the boiler combustion rate includes: When in the oil gun ignition stage, calculating the target opening according to the first opening calculation function and the boiler combustion rate; The step of controlling the start-stop state of the feed water main path inlet valve according to the current startup stage includes: When in the boiler water filling stage and the oil gun ignition stage, controlling the feed water main path inlet valve to be in the closed state.

3. The feed water control method of the supercritical generator set according to claim 2, wherein, The unit startup data further includes the number of operating coal mills; The step of, in response to the unit startup data satisfying the conditions for switching the startup stage, switching the current startup stage to the next startup stage, further includes: When the current startup stage is the oil gun ignition stage, in response to the boiler combustion rate being greater than or equal to a preset second combustion rate threshold and the number of operating coal mills being greater than or equal to a preset second quantity threshold, switching the current startup stage to the coal mill commissioning stage; wherein, the second combustion rate threshold is greater than the first combustion rate threshold; The opening calculation function further includes: a second opening calculation function matching the coal mill commissioning stage; The step of calculating the target opening of the feed water bypass regulating valve according to the opening calculation function and the boiler combustion rate further includes: When in the coal mill commissioning stage, calculating the target opening according to the second opening calculation function and the boiler combustion rate; The step of controlling the start-stop state of the feed water main path inlet valve according to the current startup stage further includes: When in the coal mill commissioning stage, controlling the feed water main path inlet valve to be in the closed state.

4. The feed water control method of the supercritical generator set according to claim 3, characterized in that, The unit startup data further includes the unit grid-connected operation load; The step of, in response to the unit startup data satisfying the conditions for switching the startup stage, switching the current startup stage to the next startup stage, further includes: When the current startup stage is the stage of putting the coal mill into use, in response to the boiler combustion rate being greater than or equal to a preset third combustion rate threshold and the grid-connected operation load of the unit being greater than or equal to a preset load threshold, the current startup stage switches to the stage of increasing the load during grid connection of the unit; wherein, the third combustion rate threshold is greater than the second combustion rate threshold; The opening calculation function further includes: a third opening calculation function matched with the stage of increasing the load during grid connection of the unit; The step of calculating the target opening of the feed water bypass regulating valve according to the opening calculation function and the boiler combustion rate further includes: During the stage of increasing the load during grid connection of the unit, calculating the target opening according to the third opening calculation function and the boiler combustion rate; The step of controlling the start-stop state of the feed water main path inlet valve according to the current startup stage further includes: During the stage of increasing the load during grid connection of the unit, controlling the feed water main path inlet valve to be in a closed state.

5. The feed water control method of the supercritical generator set according to claim 4, characterized in that, The unit startup data further includes the differential pressure between the inlet and outlet of the economizer; The step of, in response to the unit startup data satisfying the condition for switching the startup stage, switching the current startup stage to the next startup stage further includes: When the current startup stage is the stage of increasing the load during grid connection of the unit, in response to the boiler combustion rate being greater than or equal to a preset fourth combustion rate threshold and the differential pressure between the inlet and outlet of the economizer being less than a preset differential pressure threshold, the current startup stage switches to the stage of fully opening the control valve; wherein, the fourth combustion rate threshold is greater than the third combustion rate threshold; The opening calculation function further includes: a fourth opening calculation function matched with the stage of fully opening the control valve; The step of calculating the target opening of the feed water bypass regulating valve according to the opening calculation function and the boiler combustion rate further includes: During the stage of fully opening the control valve, calculating the target opening according to the fourth opening calculation function and the boiler combustion rate so that the opening of the feed water bypass regulating valve is gradually opened to 100%; The step of controlling the start-stop state of the feed water main path inlet valve according to the current startup stage further includes: During the stage of fully opening the control valve and after the opening of the feed water bypass regulating valve reaches 100%, controlling the feed water main path inlet valve to be in an open state and controlling the opening to be gradually opened to 100% according to a preset main path valve opening function.

6. The feed water control method of the supercritical generator set according to claim 1, characterized in that, Before the step of, in response to the unit startup data satisfying the condition for switching the startup stage, switching the current startup stage to the next startup stage, the feed water control method further includes: In response to satisfying the precondition, setting the current startup stage as the stage of feeding water to the boiler.

7. The feed water control method for a supercritical generator set according to claim 1, characterized in that, The feed water control method further includes: Obtaining a rate threshold for the opening of the feed water bypass regulating valve matched with the current startup stage; Controlling the change rate of the opening of the feed water bypass regulating valve to be less than the rate threshold; And / or The feed water control method further includes: In response to the actual feed water flow of the target steam-driven feed water pump being greater than or equal to a preset second flow threshold, keeping the current opening of the feed water bypass regulating valve unchanged.

8. A feed water control system for a supercritical generating unit, characterized in that, The feed water control system includes: an acquisition module, a phased processing module, and a valve opening control module; The acquisition module is used to acquire the unit startup data; The phased processing module is used to switch the current startup phase to the next startup phase in response to the unit startup data satisfying the condition for switching the startup phase; The valve opening control module is used to obtain the opening calculation function of the feed water bypass regulating valve matching the current startup phase, and calculate the target opening of the feed water bypass regulating valve according to the opening calculation function and the boiler combustion rate; the unit startup data includes the boiler combustion rate; The valve opening control module is further used to control the opening of the feed water bypass regulating valve to be the target opening, and control the start-stop state of the feed water main path inlet valve according to the current startup phase.

9. An electronic device, comprising a memory, a processor, and a computer program stored in the memory and configured to run on the processor, characterized in that, When the processor executes the computer program, it implements the feed water control method of the supercritical generator set according to any one of claims 1 to 7.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the feed water control method of the supercritical generator set according to any one of claims 1-7.

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