Energy-saving optimization method and device for automatic control system of condensate pump of thermal power generating unit

Abstract

The present application relates to a kind of thermal power generating unit control technical field, is a kind of thermal power generating unit condensate pump automatic control system energy-saving optimization method and device, the former includes determining by deaerator water regulating valve control condensate pump outlet header pressure, then judge deaerator water regulating valve whether full open;In response to no, reduce condensate pump outlet header pressure set value, until deaerator water regulating valve full open;In response to yes, judge current deaerator water regulating valve opening degree whether with condensate pump energy-saving operation match;In response to no, increase condensate pump outlet header pressure set value, until current deaerator water regulating valve opening degree with condensate pump energy-saving operation match.The present application is by lifting the opening degree of deaerator water regulating valve, reduce the throttling loss caused by deaerator water regulating valve opening degree low, simultaneously make the throttling loss of deaerator water regulating valve minimum and condensate pump outlet header pressure maximum, in reducing energy loss while guaranteeing the economy of condensate pump operation.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of fire power generating unit control technical field, a kind of fire power generating unit condensate pump automatic control system energy-saving optimization method and device. BACKGROUND

[0002] With the increasing requirement of national energy saving and emission reduction, and the gradual development of power market bidding on-line pilot, how to reduce the operating cost of fire power generating unit to the greatest extent and improve the economic benefit of power plant has become a major issue faced by each fire power enterprise. In actual production, there are many problems of excessive operating current and high power consumption of condensate pump of thermal power unit, so that the overall plant power consumption of the unit is high.

[0003] In the automatic regulation process of deaerator water level and condensate pump outlet header pressure regulation of condensate system, the deaerator water regulating valve is often not fully opened, and there are even individual units in the state of half-opened regulating valve, which causes throttling of condensate water and energy loss, and poor economic efficiency of system operation. To improve the economy of condensate system operation, it is required that the throttling loss of deaerator water regulating valve is minimized, that is, the opening of deaerator water regulating valve is effectively improved in automatic control. SUMMARY

[0004] The present application provides a kind of fire power generating unit condensate pump automatic control system energy-saving optimization method and device, which overcomes the above-mentioned deficiencies of prior art, and effectively solves the problem that the deaerator water regulating valve cannot be fully opened in the automatic regulation process of deaerator water level and condensate pump outlet header pressure of existing condensate system, which causes throttling of condensate water and energy loss.

[0005] One of the technical solutions of the present application is realized by the following measures: a kind of fire power generating unit condensate pump automatic control system energy-saving optimization method, comprising:

[0006] obtaining current deaerator water level automatic control strategy;

[0007] determining that the deaerator water regulating valve controls the condensate pump outlet header pressure, and then determining whether the deaerator water regulating valve is fully opened;

[0008] in response to no, reducing the condensate pump outlet header pressure set value until the deaerator water regulating valve is fully opened;

[0009] in response to yes, determining whether the current deaerator water regulating valve opening degree matches the energy-saving operation of condensate pump;

[0010] in response to no, increasing the condensate pump outlet header pressure set value until the current deaerator water regulating valve opening degree matches the energy-saving operation of condensate pump.

[0011] The following is a further optimization or / and improvement of the above technical solutions of the invention:

[0012] The above whether the deaerator water regulating valve is fully open or not is whether the deaerator water regulating valve opening is greater than the minimum valve position setting value.

[0013] The above whether the current deaerator water regulating valve opening matches the condensate pump energy-saving operation is that the deaerator water regulating valve opening is greater than the minimum valve position setting value and less than the maximum valve position setting value.

[0014] The above also includes a deaerator water level automatic control strategy switching, including:

[0015] When the deaerator water regulating valve of the unit is automatically operated, the deaerator water level automatic control strategy is set to single-impulse control;

[0016] Determine whether the current unit operating load is greater than the first load setting value;

[0017] In response, the deaerator water level automatic control strategy is set to three-impulse control, and the automatic control strategy is set to deaerator water regulating valve automatic control deaerator water level, and condensate pump frequency converter controls condensate pump outlet header pressure;

[0018] Determine whether the current unit operating load is greater than the second load setting value;

[0019] In response, the three-impulse control automatic control strategy is switched to deaerator water regulating valve control condensate pump outlet header pressure, and the condensate pump frequency regulation adjusts the deaerator water level.

[0020] When the current unit operating load is less than the second load setting value, determine whether the unit operating load is less than the difference between the second load setting value and the dead zone value, and in response, the three-impulse control automatic control strategy is switched to deaerator water regulating valve control condensate pump outlet header pressure, and the condensate pump frequency regulation adjusts the deaerator water level.

[0021] The above reducing the condensate pump outlet header pressure setting value includes: reducing the condensate pump outlet header pressure setting value at a constant speed change rate, and the condensate pump outlet header pressure setting value is greater than the minimum safety margin value of the condensate pump outlet header pressure.

[0022] The above increasing the condensate pump outlet header pressure setting value includes: increasing the condensate pump outlet header pressure setting value at a constant speed change rate, and the condensate pump outlet header pressure setting value is greater than the minimum safety margin value of the condensate pump outlet header pressure.

[0023] The second technical solution of the present application is realized by the following measures: a kind of energy-saving optimization device of condensate pump automatic control system of thermal power generating unit, including:

[0024] An acquisition unit acquires a current deaerator water level automatic control strategy;

[0025] A post-regulation unit determines whether the deaerator water regulating valve is fully open by controlling the condensate pump outlet header pressure, and in response to no, reduces the condensate pump outlet header pressure set value until the deaerator water regulating valve is fully open; in response to yes, determines whether the current deaerator water regulating valve opening degree matches the condensate pump energy-saving operation, and in response to no, increases the condensate pump outlet header pressure set value until the current deaerator water regulating valve opening degree matches the condensate pump energy-saving operation.

[0026] The following is a further optimization or / and improvement of the above technical solutions:

[0027] The above also includes a pre-regulation unit, which includes:

[0028] A first adjustment module sets the deaerator water level automatic control strategy to single-increment control when the deaerator water regulating valve is automatically operated.

[0029] A second adjustment module determines whether the current unit operating load is greater than a first load set value, and in response to yes, sets the deaerator water level automatic control strategy to three-increment control, and sets the automatic control strategy to deaerator water regulating valve automatic control of deaerator water level and condensate pump frequency converter control of condensate pump outlet header pressure.

[0030] A third adjustment module determines whether the current unit operating load is greater than a second load set value, and in response to yes, switches the three-increment control automatic control strategy to deaerator water regulating valve control of condensate pump outlet header pressure and condensate pump frequency regulation of deaerator water level.

[0031] The present application increases the opening degree of the deaerator water regulating valve, reduces the throttling loss caused by low deaerator water regulating valve opening degree, minimizes the throttling loss of the deaerator water regulating valve, and maximizes the condensate pump outlet header pressure, thereby reducing energy loss while ensuring the economy of the condensate pump operation. BRIEF DESCRIPTION OF DRAWINGS

[0032] The present application is a method flowchart. Figure 1 The present application is a method flowchart.

[0033] The present application is a method flowchart. Figure 2 The present application is a method flowchart.

[0034] The present application is a method flowchart. Figure 3 The present application is a method flowchart.

[0035] The present application is a method flowchart. Figure 4 The present application is a method flowchart.

[0036] The present application is a method flowchart.Figure 5 A flow chart of another method of the present application.

[0037] Figure 1 is a schematic diagram of an automatic control strategy of the present application. Figure 6 A flow chart of another method of the present application. DETAILED DESCRIPTION

[0038] The present application is not limited by the following examples, and the specific implementation can be determined according to the technical solutions of the present application and the actual situation.

[0039] The present application will be further described below in conjunction with examples and drawings:

[0040] Example 1: As shown in the accompanying drawings, the embodiment of the present application discloses an energy-saving optimization method for an automatic control system of a condensate pump of a thermal power generating unit, comprising: Figure 1

[0041] Step S101, obtaining a current deaerator water level automatic control strategy;

[0042] Step S102, determining that the condensate pump outlet header pressure is controlled by the deaerator water regulating valve, and then determining whether the deaerator water regulating valve is fully open;

[0043] Step S103, in response to no, reducing the condensate pump outlet header pressure set value until the deaerator water regulating valve is fully open;

[0044] Step S104, in response to yes, determining whether the current deaerator water regulating valve opening degree matches the condensate pump energy-saving operation;

[0045] Step S105, in response to no, increasing the condensate pump outlet header pressure set value until the current deaerator water regulating valve opening degree matches the condensate pump energy-saving operation.

[0046] The embodiment of the present application avoids the throttling loss of condensate water to the deaerator water pipeline caused by the deaerator water regulating valve not being fully open, optimizes the automatic control strategy through steps 102 to 105, and when the deaerator water regulating valve exists throttling, the loss caused by the throttling of the regulating valve is offset by increasing the condensate pump operation frequency, overcoming the control mode of the existing increasing equipment power consumption sacrificing the economic operation of the unit to maintain the stability of the deaerator water level.

[0047] ​In steps 102 to 104, when it is determined that the pressure of the condensate pump outlet header is controlled by the deaerator water supply regulating valve, it is then determined whether the deaerator water supply regulating valve is fully open. If it is not fully open, it indicates that there is condensate throttling loss in the unit, the condensate pump has high power consumption and poor operating economy. At this time, the pressure setting value of the condensate pump outlet header is reduced. As the pressure setting value of the condensate pump outlet header decreases, the deaerator water supply regulating valve changes towards the full opening of 100% at a safe rate of change, so that the throttling loss of condensate caused by the deaerator water supply regulating valve can be improved.

[0048] In steps 104 and 105, since the condensate system operates at its lowest power consumption when the deaerator water regulating valve is fully open and the condensate pump outlet header pressure is at its highest, after determining that the deaerator water regulating valve is fully open, the condensate pump outlet header pressure and the deaerator water regulating valve opening must meet the energy-saving matching conditions. That is, it must be determined whether the current condensate pump outlet header pressure is the optimal value for system operation. If the condensate pump outlet header pressure and the deaerator water regulating valve opening do not meet the energy-saving matching conditions, the condensate pump outlet header pressure setting is increased, so that the deaerator water regulating valve begins to change in the opposite direction of the opening of 100% at a safe rate of change. This minimizes the throttling loss of the deaerator water regulating valve and maximizes the condensate pump outlet header pressure, thereby reducing energy loss while ensuring the economic efficiency of condensate pump operation.

[0049] In summary, the embodiments of the present invention disclose an energy-saving optimization method for the automatic control system of condensate pumps in thermal power generating units. This method increases the opening degree of the deaerator water supply regulating valve, reduces the throttling loss caused by the low opening degree of the deaerator water supply regulating valve, minimizes the throttling loss of the deaerator water supply regulating valve, and maximizes the pressure of the condensate pump outlet header. This reduces energy consumption while ensuring the economic efficiency of condensate pump operation.

[0050] Example 2: As shown in the attached document Figure 2 As shown in the figure, an embodiment of the present invention discloses an energy-saving optimization method for an automatic control system of condensate pumps in thermal power generating units, comprising:

[0051] Step S201: Obtain the current automatic control strategy for the deaerator water level.

[0052] Step S202: If it is determined that the pressure of the condensate pump outlet header is controlled by the deaerator water regulating valve, then it is determined whether the opening of the deaerator water regulating valve is greater than the minimum valve position setting value.

[0053] Since the position feedback of the deaerator water supply regulating valve is greater than the lower limit of the valve position setting, it indicates that the deaerator water supply regulating valve is fully open. Therefore, this embodiment determines whether the deaerator water supply regulating valve is fully open by judging whether the opening degree of the deaerator water supply regulating valve is greater than the lowest valve position setting.

[0054] In step S203, in response to no, reduce the set value of the condensate pump outlet header pressure until the opening of the deaerator water regulating valve is greater than the minimum valve position setting value.

[0055] The specific steps for reducing the condensate pump outlet header pressure setting include:

[0056] (1) The current setpoint of the condensate pump outlet header pressure of the unit is SP-θ, where the value of θ is positive and the dimension is MPa;

[0057] (2) The set value of the condensate pump outlet header pressure SP-θ begins to decrease at a constant rate of change v. During this process, as the set value of the condensate pump outlet header pressure decreases, the deaerator water supply regulating valve begins to change towards full opening of 100% at a safe rate of change, thereby improving the throttling loss of condensate caused by the deaerator water supply regulating valve.

[0058] In step S204, the response is to determine whether the opening of the deaerator water regulating valve is greater than the minimum valve position setting value and less than the maximum valve position setting value.

[0059] Here, the condensate system operates at its lowest power consumption when the deaerator water regulating valve is fully open and the pump outlet header pressure is at its highest. Therefore, to determine whether the current deaerator water regulating valve opening matches the energy-saving operation of the condensate pump, we need to determine whether the deaerator water regulating valve opening is greater than the minimum valve position setting while being less than the maximum valve position setting.

[0060] When the opening of the deaerator inlet water regulating valve is greater than the maximum valve position setting, it indicates that although the current throttling loss of the deaerator inlet water regulating valve is negligible, the current condensate system header pressure is low. To maintain a stable deaerator water level, the condensate pump variable frequency output power is still relatively high, resulting in poor economic performance of the condensate pump operation. Therefore, it is necessary to ensure that the throttling loss of the deaerator inlet water regulating valve is minimized (the opening of the deaerator inlet water regulating valve is greater than the minimum valve position setting) and the condensate pump outlet header pressure is maximized (the opening of the deaerator inlet water regulating valve is less than the maximum valve position setting).

[0061] In step S205, in response to no, increase the condensate pump outlet header pressure setting value until the deaerator water supply regulating valve opening is greater than the minimum valve position setting value and lower than the maximum valve position setting value.

[0062] This section adds the condensate pump outlet header pressure setting value, specifically including:

[0063] (1) The current setpoint of the condensate pump outlet header pressure of the unit is SP+θ, where the value of θ is positive and the dimension is MPa;

[0064] (2) The set value of the condensate pump outlet header pressure SP+θ begins to increase at a constant rate of change v. During this process, as the set value of the condensate pump outlet header pressure increases, the deaerator water supply regulating valve begins to change at a safe rate of change in the opposite direction to the full opening of 100% (i.e., the direction of the lowest valve position setting), so that the throttling loss of condensate caused by the deaerator water supply regulating valve is minimized and the condensate pump outlet header pressure is maximized.

[0065] In this embodiment, when the opening of the deaerator water supply regulating valve is between the lowest and highest valve position settings, the condensate pump outlet header pressure setting value SP remains constant. At this time, the throttling loss caused by the deaerator water supply regulating valve is minimal, the condensate pump outlet header pressure is maximum, the condensate pump power consumption is minimal, and the energy-saving effect is optimal.

[0066] Example 3: As shown in the attached document Figure 3 As shown in the figure, this invention discloses an energy-saving optimization method for an automatic control system of condensate pumps in thermal power generating units, which further includes switching the automatic control strategy for deaerator water level, including:

[0067] Step S301: When the water level regulating valve of the deaerator of the unit is running automatically, the automatic control strategy of the deaerator water level is set to single-impulse control.

[0068] Here, the deaerator water supply regulating valve of the unit operates automatically. That is, after the unit starts, according to the current operating load, condensate pump output, condensate pump outlet pressure, deaerator water level changes and other operating conditions, the deaerator water supply regulating valve is switched from manual control to automatic control, the condensate pump is switched from power frequency operation mode to variable frequency operation mode, and the condensate pump control mode is switched from manual control mode to automatic control mode.

[0069] Step S302: Determine whether the current operating load of the unit is greater than the first load setpoint.

[0070] Here, the current unit operating load P1 is set, and the first load setpoint α%P is set. e , where P e Let α be the rated load of the unit and α be a coefficient. The determination of whether the current operating load of the unit exceeds the first load setting is equivalent to determining whether P1 > α%P. e .

[0071] In step S303, the response is to set the automatic control strategy for the deaerator water level to three-impulse control, and the automatic control strategy is set to automatically control the deaerator water level with the deaerator water inlet regulating valve, and the condensate pump frequency converter controls the pressure of the condensate pump outlet header.

[0072] If the response is negative, then determine whether P1 < α%P. e-δ, if no response, the automatic control strategy is set to three-impulse control for the deaerator water level; if so, the automatic control strategy is set to frequency conversion control of the condensate pump outlet pressure and single-impulse control of the deaerator water level by the deaerator water supply regulating valve.

[0073] Wherein, δ is the dead zone value; the condensate pump outlet pressure control is an automatic controller that calculates the condensate pump outlet pressure deviation and automatically acts on the condensate pump frequency converter; the deaerator water level control is an automatic controller that calculates the deaerator water level deviation and automatically acts on the deaerator water inlet regulating valve.

[0074] Step S304: Determine whether the current operating load of the unit is greater than the second load setting.

[0075] Here, the current unit operating load P2 is set, and the second load setpoint β%P is set. e , where P e Given the unit's rated load and β as a coefficient, the determination of whether the current operating load of the unit exceeds the second load setting is equivalent to determining whether P2 > β%P. e .

[0076] In step S305, the response is to switch the automatic control strategy of three-impulse control to control the pressure of the condensate pump outlet header by the deaerator water regulating valve, and to adjust the deaerator water level by the frequency converter of the condensate pump.

[0077] Step S306: If no response is received, determine whether the operating load of the unit is less than the difference between the second load setpoint and the dead zone value. If no response is received, switch the automatic control strategy of three-impulse control to control the pressure of the condensate pump outlet header by the deaerator water regulating valve, and adjust the deaerator water level by frequency conversion of the condensate pump.

[0078] Here, the response is no; it determines whether P2 < β%P. e -δ, if the response is no, the automatic control strategy of three-impulse control will be switched to the deaerator water inlet regulating valve controlling the condensate pump outlet main pipe pressure, and the condensate pump frequency converter regulating the deaerator water level; if the response is yes, the specific control strategy will be switched to: the condensate pump frequency converter controlling the condensate pump outlet main pipe pressure, and the deaerator water inlet regulating valve controlling the deaerator water level with a single impulse.

[0079] Among them, the condensate pump outlet pressure control is automatically applied to the condensate pump frequency converter by the automatic controller calculating the deviation of the condensate pump outlet pressure; the deaerator water level control is calculated by the main controller, which calculates the deaerator water level deviation and adds the deaerator water volume after the main feedwater flow rate of the unit is converted by g(x) as the set value of the secondary controller; the secondary controller calculates the deaerator water flow deviation and uses it as the instruction output of the deaerator water regulating valve.

[0080] The specific automatic control strategies corresponding to the energy-saving optimization methods for the automatic control systems of condensate pumps in Examples 1 to 3 above are attached. Figure 6 As shown.

[0081] Example 4: As shown in the appendix Figure 4 As shown in the figure, an embodiment of the present invention discloses an energy-saving optimization device for an automatic control system of condensate pumps in thermal power generating units, comprising:

[0082] The acquisition unit acquires the current automatic control strategy for the deaerator water level.

[0083] The subsequent control unit determines that the deaerator water supply regulating valve controls the condensate pump outlet header pressure. It then checks whether the deaerator water supply regulating valve is fully open. If no, it reduces the condensate pump outlet header pressure setting until the deaerator water supply regulating valve is fully open. If yes, it checks whether the current deaerator water supply regulating valve opening matches the energy-saving operation of the condensate pump. If no, it increases the condensate pump outlet header pressure setting until the current deaerator water supply regulating valve opening matches the energy-saving operation of the condensate pump.

[0084] Example 5: As shown in the attached document Figure 5 As shown in the figure, an embodiment of the present invention discloses an energy-saving optimization device for an automatic control system of condensate pumps in thermal power generating units, comprising:

[0085] The acquisition unit acquires the current automatic control strategy for the deaerator water level.

[0086] The downstream control unit determines that the deaerator water supply regulating valve controls the condensate pump outlet header pressure. If so, it checks whether the deaerator water supply regulating valve is fully open. If no, it reduces the condensate pump outlet header pressure setting until the deaerator water supply regulating valve is fully open. If so, it checks whether the current deaerator water supply regulating valve opening matches the energy-saving operation of the condensate pump. If no, it increases the condensate pump outlet header pressure setting until the current deaerator water supply regulating valve opening matches the energy-saving operation of the condensate pump.

[0087] The pre-regulation unit includes:

[0088] The first regulating module sets the automatic water level control strategy of the deaerator to single-impulse control when the water regulating valve of the deaerator of the unit is running automatically.

[0089] The second adjustment module determines whether the current unit operating load is greater than the first load setpoint; in response, it sets the automatic control strategy for the deaerator water level to three-impulse control, and the automatic control strategy is set to automatically control the deaerator water level by the deaerator water inlet regulating valve, and the condensate pump frequency converter controls the pressure of the condensate pump outlet header.

[0090] The third adjustment module determines whether the current unit operating load is greater than the second load setpoint; in response, it switches the automatic control strategy of three-impulse control to control the pressure of the condensate pump outlet header by the deaerator water regulating valve, and the condensate pump frequency converter adjusts the deaerator water level.

[0091] The above technical features constitute the preferred embodiment of the present invention, which has strong adaptability and optimal implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. An energy-saving optimization method for an automatic control system of condensate pumps in a thermal power generating unit, characterized in that, include: Obtain the current automatic control strategy for the deaerator water level; If it is determined that the pressure of the condensate pump outlet header is controlled by the deaerator water supply regulating valve, then it is necessary to determine whether the deaerator water supply regulating valve is fully open, that is, whether the opening degree of the deaerator water supply regulating valve is greater than the minimum valve position setting value. If the response is no, reduce the pressure setting of the condensate pump outlet header until the deaerator water supply regulating valve is fully open; Therefore, it is determined whether the current opening of the deaerator water regulating valve is compatible with the energy-saving operation of the condensate pump; If the response is no, increase the set value of the condensate pump outlet header pressure until the current deaerator water supply regulating valve opening matches the energy-saving operation of the condensate pump, that is, the deaerator water supply regulating valve opening is greater than the minimum valve position setting value and less than the maximum valve position setting value. The automatic water level control strategy switching for the deaerator includes: When the water level regulating valve of the deaerator is running automatically, the automatic control strategy for the deaerator water level is set to single-impulse control. Determine whether ,in, This represents the current operating load of the generating unit. Set as the first load value. This is the rated load of the unit. For coefficients; Therefore, the automatic control strategy for the deaerator water level is set to three-impulse control, and the automatic control strategy is set to automatically control the deaerator water level with the deaerator water inlet regulating valve, and the condensate pump frequency converter controls the pressure of the condensate pump outlet header. Respond to no, determine whether ,in If the dead zone value is not specified, the automatic deaerator water level control strategy will be set to three-impulse control; if the response is not specified, the automatic deaerator water level control strategy will be set to condensate pump frequency conversion control of condensate pump outlet pressure and deaerator water supply regulating valve single-impulse control of deaerator water level. Determine whether ,in, This represents the current operating load of the generating unit. The second load setting, This is the rated load of the unit. For coefficients; In response, the automatic control strategy of three-impulse control was switched to control the pressure of the condensate pump outlet header by the deaerator water regulating valve, and the condensate pump frequency converter adjusted the deaerator water level. Respond to no, determine whether ,in If the dead zone value is not specified, the automatic control strategy of the three-impulse control will be switched to the deaerator water supply regulating valve controlling the condensate pump outlet main pipe pressure, and the condensate pump frequency converter regulating the deaerator water level; if the response is positive, the automatic control strategy of the three-impulse control will be switched to the condensate pump frequency converter controlling the condensate pump outlet main pipe pressure, and the deaerator water supply regulating valve controlling the deaerator water level with a single impulse.

2. The energy-saving optimization method for the automatic control system of condensate pumps in thermal power generating units according to claim 1, characterized in that, When the current unit operating load is less than the second load setpoint, it is determined whether the unit operating load is less than the difference between the second load setpoint and the dead zone value. If not, the automatic control strategy of three-impulse control is switched to control the pressure of the condensate pump outlet header by the deaerator water regulating valve, and the condensate pump frequency converter adjusts the deaerator water level.

3. The energy-saving optimization method for the automatic control system of condensate pumps in thermal power generating units according to claim 1 or 2, characterized in that, The reduction of the condensate pump outlet header pressure setpoint includes: reducing the condensate pump outlet header pressure setpoint at a constant rate of change, and ensuring that the condensate pump outlet header pressure setpoint is greater than the minimum safety margin value of the condensate pump outlet header pressure.

4. The energy-saving optimization method for the automatic control system of condensate pumps in thermal power generating units according to claim 1 or 2, characterized in that, The method of increasing the set value of the condensate pump outlet header pressure includes: increasing the set value of the condensate pump outlet header pressure at a constant rate of change, and the set value of the condensate pump outlet header pressure is greater than the minimum safety margin value of the condensate pump outlet header pressure.

5. The energy-saving optimization method for the automatic control system of condensate pumps in thermal power generating units according to claim 3, characterized in that, The method of increasing the set value of the condensate pump outlet header pressure includes: increasing the set value of the condensate pump outlet header pressure at a constant rate of change, and the set value of the condensate pump outlet header pressure is greater than the minimum safety margin value of the condensate pump outlet header pressure.

6. An energy-saving optimization device for an automatic control system of condensate pumps in a thermal power generating unit, wherein the energy-saving optimization device uses the energy-saving optimization method for an automatic control system of condensate pumps in a thermal power generating unit as described in any one of claims 1 to 5, characterized in that, include: The pre-regulation unit includes: The first regulating module sets the automatic water level control strategy of the deaerator to single-impulse control when the water regulating valve of the deaerator of the unit is running automatically. The second adjustment module includes: Determine whether ,in, This represents the current operating load of the generating unit. Set as the first load value. This is the rated load of the unit. For coefficients; Therefore, the automatic control strategy for the deaerator water level is set to three-impulse control, and the automatic control strategy is set to automatically control the deaerator water level with the deaerator water inlet regulating valve, and the condensate pump frequency converter controls the pressure of the condensate pump outlet header. Respond to no, determine whether ,in If the dead zone value is not specified, the automatic deaerator water level control strategy will be set to three-impulse control; if the response is not specified, the automatic deaerator water level control strategy will be set to condensate pump frequency conversion control of condensate pump outlet pressure and deaerator water supply regulating valve single-impulse control of deaerator water level. The third adjustment module includes: Determine whether ,in, This represents the current operating load of the generating unit. The second load setting, This is the rated load of the unit. For coefficients; In response, the automatic control strategy of three-impulse control was switched to control the pressure of the condensate pump outlet header by the deaerator water regulating valve, and the condensate pump frequency converter adjusted the deaerator water level. Respond to no, determine whether ,in If the value is a dead zone, and the response is no, then the automatic control strategy of the three-impulse control will be switched to the deaerator water inlet regulating valve controlling the condensate pump outlet header pressure, and the condensate pump frequency converter regulating the deaerator water level; if the response is yes, then the automatic control strategy of the three-impulse control will be switched to the condensate pump frequency converter controlling the condensate pump outlet header pressure, and the deaerator water inlet regulating valve controlling the deaerator water level with a single impulse. The acquisition unit acquires the current automatic control strategy for the deaerator water level. The subsequent control unit determines that the deaerator water supply regulating valve controls the condensate pump outlet header pressure. It then checks whether the deaerator water supply regulating valve is fully open. If no, it reduces the condensate pump outlet header pressure setting until the deaerator water supply regulating valve is fully open. If yes, it checks whether the current deaerator water supply regulating valve opening matches the energy-saving operation of the condensate pump. If no, it increases the condensate pump outlet header pressure setting until the current deaerator water supply regulating valve opening matches the energy-saving operation of the condensate pump.

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