Flue-gas-heat-storage-based frequency regulation method and apparatus for thermal power unit including low-temperature economizer

Abstract

Provided in the present invention are a flue-gas-heat-storage-based frequency regulation method and apparatus for a thermal power unit including a low-temperature economizer. The method comprises: in response to a power-grid frequency deviation exceeding a dead zone, starting up a steam-turbine governor system, and on the basis of the steam-turbine governor system and the power-grid frequency deviation, calculating an expected power increment of a thermal power unit, an expected frequency variation of a condensate-water throttling condensate pump, and an expected fan frequency variation of a variable-frequency fan in a flu gas duct; on the basis of the expected frequency variation of the condensate-water throttling condensate pump and the expected fan frequency variation, controlling one or a combination of a flow-regulating valve in a condensate and extraction direction, a flow-regulating valve in a condensate and flue gas direction, and the fan frequency of the variable-frequency fan in the flue gas duct, so as to obtain a power control result; and when the power control result satisfies the requirement of the expected power increment of the thermal power unit, obtaining a frequency regulation result after the completion of frequency regulation. The present invention solves the problems in the prior art of the frequency regulation capability and utilization of flue-gas waste heat being insufficient.

Description

Flue gas heat storage frequency modulation method and device for thermal power generating unit comprising low-temperature economizer TECHNICAL FIELD

[0001] The present application relates to the technical field of generator set frequency modulation, and particularly relates to a flue gas heat storage frequency modulation method and device for thermal power generating unit comprising a low-temperature economizer. BACKGROUND

[0002] Under the double-carbon development goal, with the increasing proportion of renewable energy, the frequency stability of the power system is under great pressure and challenge. Frequency is a key indicator of power grid operation. In an alternating current power system, frequency is a reflection of active power balance. On the one hand, new energy with power electronic interface does not have the rotational inertia and primary frequency modulation capability of traditional synchronous machines. Large-scale access leads to a decrease in system synchronous rotational inertia and primary frequency modulation capability, and a decrease in the system's resistance to power disturbance. On the other hand, the random fluctuation of renewable energy output is large, the amplitude and frequency of power disturbance in system operation increase, and the requirement for system frequency modulation capability increases.

[0003] The energy endowment of China is "rich in coal, poor in oil and gas", which determines that coal-fired thermal power will still be the adjustment resource in China for a very long period in the future. The role of thermal power generating units in the power system will gradually change from providing long-term power supply as base load power supply to providing short-term power supply as adjustment power supply. In a double-high power system, thermal power generating units will bear the main frequency modulation task, and providing primary frequency modulation capability will become one of the most important tasks of future thermal power plants.

[0004] The current frequency modulation technology commonly used by thermal power generating units includes main steam valve frequency modulation, condensate throttling frequency modulation, feedwater bypass frequency modulation, heating butterfly valve frequency modulation and supplementary steam valve frequency modulation. Among them, the main steam valve frequency modulation has limited valve opening margin, which leads to insufficient frequency modulation capability to suppress large disturbances, and requires condensate throttling and other strategies to supplement. In order to reduce coal consumption, many thermal power generating units currently carry out deep utilization technology of flue gas waste heat. The specific means is that flue gas above 100 DEG C is passed into a low-temperature economizer or a low-low-temperature economizer, and then enters an electric precipitator or a desulfurization tower. The flue gas waste heat of the low-temperature economizer is transmitted to the condensate water of the low-pressure heater. Usually, this part of flue gas waste heat is used to partially replace the low-pressure cylinder extraction steam to provide condensate water heat for the low-pressure heater. In this process, the condensate water system collects the low-pressure steam discharged from the steam turbine and condenses it into water. The condensed water is sent back to the boiler as boiler feedwater. At the same time, the flue gas waste heat heats the condensed water in the low-pressure cylinder of the steam turbine to increase the temperature of the condensed water entering the boiler. However, the effect of auxiliary frequency modulation by condensate throttling is not significant during the frequency modulation process of such units. The reason is that the condensate water of a certain low-pressure heater is partially or entirely heated by the low-temperature economizer. Since the heating capacity of the low-temperature economizer is fixed and there is a heat balance, the adjustment of the condensate water flow to the low-pressure cylinder extraction steam flow is not significant.

[0005] Taking the grid low frequency event as an example, if the condensate throttling strategy is adopted, the condensate water flow heated by flue gas waste heat and low-pressure cylinder extraction steam is reduced, and due to the heat balance between the extraction steam and the condensate water, the low-pressure cylinder extraction steam flow is reduced, and the flue gas side heat supply is also reduced due to the control logic, at this time, there may be two problems: on the one hand, the low-pressure cylinder extraction steam flow reduction is less than the effect of directly bypassing the extraction steam heat supply pipeline, and the frequency modulation effect is poor; on the other hand, after the low-pressure cylinder extraction steam flow is continuously reduced, the condensate water outlet temperature is correspondingly reduced, which may cause safety hazards of the deaerator water level and pressure.

[0006] In summary, the prior art has the problems of poor frequency modulation effect and insufficient deep utilization of flue gas waste heat. SUMMARY

[0007] The present application provides a kind of flue gas heat storage frequency modulation method and device of thermal power generating unit comprising low temperature economizer, to solve the problems of poor frequency modulation effect and insufficient deep utilization of flue gas waste heat in prior art, realize the flue gas heat storage frequency modulation of thermal power generating unit with remarkable frequency modulation effect and less safety hazards.

[0008] The present application provides a kind of flue gas heat storage frequency modulation method of thermal power generating unit comprising low temperature economizer, comprising: in response to the grid frequency difference exceeding dead zone, starting turbine governor system, calculating the power expected increment of thermal power generating unit, the expected value of condensate throttling condensate pump frequency variation and the expected value of fan frequency variation of flue gas duct variable frequency fan based on the turbine governor system according to the grid frequency difference;According to the expected value of condensate throttling condensate pump frequency variation and the expected value of fan frequency variation of flue gas duct variable frequency fan, control the combination of one or more of condensate-steam direction flow regulating valve, condensate-flue gas direction flow regulating valve and fan frequency of flue gas duct variable frequency fan, and then get power control result;Wherein, the flue gas duct variable frequency fan is installed in the flue gas duct of the low temperature economizer section of the thermal power generating unit, the condensate-steam direction flow regulating valve is installed in the pipeline where the condensate water flows to the low-pressure cylinder extraction steam side, and the condensate-flue gas direction flow regulating valve is installed in the pipeline where the condensate water flows to the flue gas side;In the case where the power control result meets the requirement of the power expected increment of the thermal power generating unit, the frequency modulation result of frequency modulation completion is obtained.

[0009] According to the application, a flue gas heat storage frequency regulation method for a thermal power generating unit comprising a low-temperature economizer is provided, the method comprising: controlling one or more of a combination of a condensate-steam direction flow regulating valve, a condensate-flue gas direction flow regulating valve, and a frequency of a flue gas duct variable frequency fan according to a condensate throttling condensate pump frequency variation expected value and a fan frequency variation expected value, thereby obtaining a power control result, specifically comprising: issuing a condensate throttling condensate pump frequency and a fan frequency through an electro-hydraulic servo mechanism; calculating a condensate pump frequency increasing / decreasing speed according to the condensate throttling condensate pump frequency variation expected value; calculating a fan frequency increasing / decreasing speed according to the fan frequency variation expected value; adjusting one or more of a combination of the condensate-steam direction flow regulating valve, the condensate-flue gas direction flow regulating valve, and the fan frequency of the flue gas duct variable frequency fan according to the condensate pump frequency increasing / decreasing speed and / or the fan frequency increasing / decreasing speed, thereby obtaining a power control result; and calculating a set value required by a deaerator water level, a pressure, and a condensate outlet temperature when flue gas heat storage is released.

[0010] According to the application, a flue gas heat storage frequency regulation method for a thermal power generating unit comprising a low-temperature economizer is provided, the method comprising: adjusting one or more of a combination of the condensate-steam direction flow regulating valve, the condensate-flue gas direction flow regulating valve, and the fan frequency of the flue gas duct variable frequency fan according to the condensate pump frequency increasing / decreasing speed and / or the fan frequency increasing / decreasing speed, thereby obtaining a power control result, specifically comprising: increasing the fan frequency according to the fan frequency increasing / decreasing speed when a current event is a low-frequency event; and increasing flue gas flow in response to the increase of the fan frequency, thereby obtaining a power control result of enhancing power lifting effect.

[0011] According to the application, a flue gas heat storage frequency regulation method for a thermal power generating unit comprising a low-temperature economizer is provided, the method comprising: adjusting one or more of a combination of the condensate-steam direction flow regulating valve, the condensate-flue gas direction flow regulating valve, and the fan frequency of the flue gas duct variable frequency fan according to the condensate pump frequency increasing / decreasing speed and / or the fan frequency increasing / decreasing speed, thereby obtaining a power control result, specifically comprising: decreasing the fan frequency according to the fan frequency increasing / decreasing speed when a current event is a high-frequency event; and decreasing flue gas flow in response to the decrease of the fan frequency, thereby obtaining a power control result of decreasing power of the thermal power generating unit.

[0012] According to the power frequency regulation method for the thermal power generating unit with the low-temperature economizer provided by the application, the combination of one or more of the condensate-steam direction flow regulating valve, the condensate-smoke direction flow regulating valve and the fan frequency of the smoke pipeline variable frequency fan is adjusted according to the condensate pump frequency increasing / decreasing speed and / or the fan frequency increasing / decreasing speed, and then the power control result is obtained, and the method further comprises: in the case that the current event is a low frequency event, the condensate-steam direction flow regulating valve is closed according to the condensate pump frequency increasing / decreasing speed while the smoke heat storage is utilized; in response to the condensate-steam direction flow regulating valve being closed, the steam flow is reduced to a minimum value, and then the power control result of the enhanced power lifting effect is obtained.

[0013] According to the power frequency regulation method for the thermal power generating unit with the low-temperature economizer provided by the application, the combination of one or more of the condensate-steam direction flow regulating valve, the condensate-smoke direction flow regulating valve and the fan frequency of the smoke pipeline variable frequency fan is adjusted according to the condensate pump frequency increasing / decreasing speed and / or the fan frequency increasing / decreasing speed, and then the power control result is obtained, and the method further comprises: in the case that the current event is a high frequency event, the condensate-steam direction flow regulating valve is completely opened according to the condensate pump frequency increasing / decreasing speed, and the condensate-smoke direction flow regulating valve is closed or completely closed according to the condensate pump frequency increasing / decreasing speed; in response to the condensate-steam direction flow regulating valve being completely opened and the condensate-smoke direction flow regulating valve being closed or completely closed, the steam flow is increased to a maximum value, and then the power control result of the reduced thermal power generating unit power is obtained.

[0014] The application further provides a power frequency regulation device for a thermal power generating unit with a low-temperature economizer, which comprises: an information unit, which is used for starting a steam turbine governor system in response to the power grid frequency difference exceeding a dead zone, and calculating a thermal power generating unit power expected increment, a condensate pump frequency variation expected value and a fan frequency variation expected value of a smoke pipeline variable frequency fan based on the steam turbine governor system according to the power grid frequency difference; a control unit, which is used for controlling the combination of one or more of a condensate-steam direction flow regulating valve, a condensate-smoke direction flow regulating valve and the fan frequency of the smoke pipeline variable frequency fan according to the condensate pump frequency variation expected value and the fan frequency variation expected value, and then obtaining a power control result; wherein the smoke pipeline variable frequency fan is installed in a smoke pipeline of the low-temperature economizer section of the thermal power generating unit, the condensate-steam direction flow regulating valve is installed in a pipeline where the condensate flows to the steam side of the low-pressure cylinder, and the condensate-smoke direction flow regulating valve is installed in a pipeline where the condensate flows to the smoke direction; and a result unit, which is used for obtaining a frequency regulation result of the frequency regulation being completed in the case that the power control result meets the requirement of the thermal power generating unit power expected increment.

[0015] The application further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method for frequency regulation of a thermal power generating unit with a low-temperature economizer according to any one of the above when executing the program.

[0016] The application further provides a non-transitory computer-readable storage medium, which stores a computer program, wherein the computer program is executable on a processor to implement the method for frequency regulation of a thermal power generating unit with a low-temperature economizer according to any one of the above.

[0017] The application further provides a computer program product, which comprises a computer program, wherein the computer program is executable on a processor to implement the method for frequency regulation of a thermal power generating unit with a low-temperature economizer according to any one of the above.

[0018] The application provides the method and device for frequency regulation of a thermal power generating unit with a low-temperature economizer, which starts a turbine governor system in response to a grid frequency difference exceeding a dead zone, calculates a power expected increment of the thermal power generating unit, a condensate throttling condensate pump frequency change expected value, and a fan frequency change expected value of a variable frequency fan of a flue gas pipeline based on the turbine governor system according to the grid frequency difference, controls one or more of a combination of a condensate-steam extraction direction flow regulating valve, a condensate-flue gas direction flow regulating valve, and the fan frequency of the variable frequency fan of the flue gas pipeline according to the condensate throttling condensate pump frequency change expected value and the fan frequency change expected value, and obtains a power control result, wherein the variable frequency fan of the flue gas pipeline is installed in a flue gas pipeline of a low-temperature economizer section of the thermal power generating unit, the condensate-steam extraction direction flow regulating valve is installed in a pipeline where condensate of the thermal power generating unit flows to a steam extraction side of a low-pressure cylinder, and the condensate-flue gas direction flow regulating valve is installed in a pipeline where condensate of the thermal power generating unit flows to a flue gas direction, and obtains a frequency regulation result of frequency regulation completion when the power control result meets a requirement of the power expected increment of the thermal power generating unit. The application controls the flow regulating valve and the fan frequency according to the expected value, thereby affecting steam extraction flow, affecting unit power, and finally completing frequency regulation, so that the frequency regulation of the thermal power generating unit with flue gas heat storage has a remarkable effect and less safety hazards. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0020] Fig. 1 is a flow diagram of a method for flue gas heat storage frequency modulation of a thermal power generating unit provided by the present application and comprising a low-temperature economizer; Fig. 2 is a structural diagram of a low-temperature economizer section of a thermal power generating unit in the method for flue gas heat storage frequency modulation of a thermal power generating unit provided by the present application and comprising a low-temperature economizer; Fig. 3 is a structural diagram of a flue gas heat storage frequency modulation device of a thermal power generating unit provided by the present application and comprising a low-temperature economizer; and Fig. 4 is a structural diagram of an electronic device provided by the present application.

[0021] In the drawings: 1: boiler; 2: low-temperature economizer; 3: electrostatic precipitator; 4: desulfurization tower; 5: low-pressure heater; 6: condensate heater; 7: flue gas reheater; and 8: chimney. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions in the present application will be described below in connection with the drawings in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative work fall within the scope of protection of the present application.

[0023] The method for flue gas heat storage frequency modulation of a thermal power generating unit provided by the present application and comprising a low-temperature economizer will be described below in connection with Figs. 1 and 2. As shown in Fig. 1, the method comprises: step 110: in response to a grid frequency difference exceeding a dead zone, starting a steam turbine governor system, and based on the steam turbine governor system, calculating a thermal power generating unit power expected increment, a condensate throttling condensate pump frequency change expected value, and a flue gas duct variable frequency fan fan frequency change expected value according to the grid frequency difference; it needs to be noted that the present application is particularly suitable for frequency modulation of a thermal power generating unit comprising a low-temperature economizer. As shown in Fig. 2, the thermal power generating unit referred to in the embodiments of the present application is heated by a low-temperature economizer (or a low-low-temperature economizer) and low-pressure cylinder extraction steam together to heat condensate in a low-pressure heater. Specifically, flue gas escapes from a boiler 1, flows into a low-temperature economizer (or a low-low-temperature economizer) 2, and then enters an electrostatic precipitator 3 and / or a desulfurization tower 4. Condensate in the low-pressure heater is divided into two paths, one of which is heated by low-pressure cylinder extraction steam in a low-pressure heater 5 (condensate-extraction steam direction), and the other of which is heated by heated circulating water of the low-temperature economizer in a condensate heater 6 (condensate-flue gas direction). The embodiments of the present application are provided with a flow regulating valve in each path, i.e., a condensate-extraction steam direction flow regulating valve is installed on a pipe through which the condensate of the thermal power generating unit flows to the low-pressure cylinder extraction steam side, and a condensate-flue gas direction flow regulating valve is installed on a pipe through which the condensate of the thermal power generating unit flows to the flue gas side.

[0024] Further, in the present application, a variable frequency fan is also installed in the flue gas duct of the low-temperature economizer section of the thermal power generating unit. The variable frequency fan can utilize or increase flue gas heat storage and prolong the frequency modulation time by changing the frequency.

[0025] In addition to the low-temperature economizer section flue gas pipeline variable frequency fan, condensate-steam extraction direction flow regulating valve and condensate-flue gas flow regulating valve, the thermal power generating unit referred to in the present application also includes a speed governor system and an electro-hydraulic servo mechanism.

[0026] In the present application, the power expected increment of the thermal power generating unit, the expected value of the frequency change of the condensate throttling condensate pump and the expected value of the frequency change of the fan of the flue gas pipeline are obtained by calculation according to the grid frequency.

[0027] The current grid frequency difference is obtained. It can be understood that the grid frequency difference can be obtained by monitoring and calculating the frequency difference between voltage or current waveforms at different locations in the power system.

[0028] When the grid frequency difference exceeds the dead zone, the calculation of the power expected increment of the thermal power generating unit, the expected value of the frequency change of the condensate throttling condensate pump and the expected value of the frequency change of the fan of the flue gas pipeline variable frequency fan is started. The flow of the response frequency modulation of the embodiment of the present application is: starting the steam turbine speed governor system, according to the grid frequency difference signal, sequentially converting the power expected increment of the thermal power generating unit, the expected value of the frequency change of the output condensate throttling condensate pump and the expected value of the frequency change of the fan of the flue gas pipeline variable frequency fan.

[0029] It can be understood that the electro-hydraulic servo mechanism can be used to control the operating frequency of the condensate pump and the flue gas pipeline fan to achieve accurate control of the flow and pressure of the fluid in the industrial process. In some embodiments, the frequency of the condensate pump and the flue gas pipeline fan is issued by the electro-hydraulic servo mechanism, that is, the expected value of the frequency change of the condensate throttling condensate pump and the expected value of the frequency change of the fan of the flue gas pipeline variable frequency fan are issued to the condensate pump and the flue gas pipeline fan for subsequent control.

[0030] Step 120: controlling the combination of one or more of the condensate-steam extraction direction flow regulating valve, the condensate-flue gas direction flow regulating valve and the fan frequency of the flue gas pipeline variable frequency fan according to the condensate throttling condensate pump frequency change expected value and the fan frequency change expected value, thereby obtaining the power control result; in the prior art, in order to realize flue gas deep cooling waste heat utilization, flue gas heat is usually transmitted to condensate in a certain stage of low pressure heater through a low temperature economizer, which leads to that when the power of a thermal power generating unit is adjusted by condensate throttling, the effect is not obvious enough, and the condensate outlet temperature and the deaerator water level are still easy to exceed the safety boundary, and the frequency modulation duration is not long enough. The present application changes the flue gas flow through the low temperature economizer by the fan frequency, thereby affecting the heat exchange amount between the flue gas and the condensate, improving the frequency modulation duration and improving the frequency modulation effect. In a high frequency event, the fan frequency and the flow of the flue gas are reduced; otherwise, the fan frequency and the flow of the flue gas are increased. In actual operation, different control strategies of the flow regulating valve and / or the fan frequency are adopted for different events by judging the low frequency event / high frequency event of the power grid frequency, thereby changing the flue gas flow and the steam extraction flow, and further affecting the power of the steam turbine, so as to change the power of the unit.

[0031] That is, the power control result referred to in the embodiment of the present application includes the influence condition on the power of the steam turbine or the influence condition on the power of the unit after the above control.

[0032] In the present application, the controlling the combination of one or more of the condensate-steam extraction direction flow regulating valve, the condensate-flue gas direction flow regulating valve and the fan frequency of the flue gas pipeline variable frequency fan according to the condensate throttling condensate pump frequency change expected value and the fan frequency change expected value, thereby obtaining the power control result, specifically includes: issuing the condensate throttling condensate pump frequency and the fan frequency through an electro-hydraulic servo mechanism; calculating the condensate pump frequency increasing / decreasing speed according to the condensate throttling condensate pump frequency change expected value; calculating the fan frequency increasing / decreasing speed according to the fan frequency change expected value; adjusting the combination of one or more of the condensate-steam extraction direction flow regulating valve, the condensate-flue gas direction flow regulating valve and the fan frequency of the flue gas pipeline variable frequency fan according to the condensate pump frequency increasing / decreasing speed and / or the fan frequency increasing / decreasing speed, thereby obtaining the power control result; in the case that the flue gas heat storage release is completed, calculating the set value required by the deaerator water level, the pressure and the condensate outlet temperature.

[0033] The calculation of the condensate throttling condensate pump frequency and the fan frequency increasing / decreasing speed can further assist the control of the condensate-steam extraction direction flow regulating valve, the condensate-flue gas direction flow regulating valve and the fan frequency of the flue gas pipeline variable frequency fan according to the condensate throttling condensate pump frequency change expected value and the fan frequency change expected value in the subsequent step.

[0034] In the actual response to frequency modulation process, the power increment is converted, the expected value of the output condensate throttling condensate pump frequency change and the expected value of the flue gas fan frequency change are obtained, and the condensate pump and the flue gas duct fan frequency are issued through the electro-hydraulic servo mechanism. Secondly, the condensate pump frequency and the flue gas duct variable frequency fan frequency increase and decrease speed are specifically calculated. After the release of flue gas heat storage, the setting value required for calculating the deaerator water level, pressure and condensate outlet temperature is proposed.

[0035] The calculation of the setting value required for the deaerator water level, pressure and condensate outlet temperature can further avoid the possibility of current safety hazards, and correct parameter setting value is of great significance to the effective operation of the deaerator, the improvement of energy utilization efficiency, the safety of equipment and the prolongation of service life.

[0036] In the present application, the combination of one or more of the condensate pump frequency increase and decrease speed and / or the fan frequency increase and decrease speed is adjusted to obtain the power control result, specifically including: in the case of a low frequency event, the fan frequency is increased according to the fan frequency increase and decrease speed; in response to the increase of the fan frequency, the flue gas flow is increased, and the power control result of enhancing the power lifting effect is obtained.

[0037] In the present application, the combination of one or more of the condensate pump frequency increase and decrease speed and / or the fan frequency increase and decrease speed is adjusted to obtain the power control result, specifically including: in the case of a high frequency event, the fan frequency is reduced according to the fan frequency increase and decrease speed; in response to the reduction of the fan frequency, the flue gas flow is reduced, and the power control result of reducing the power of the thermal power unit is obtained.

[0038] In order to realize the deep cooling of flue gas waste heat utilization, the flue gas heat is usually transmitted to the condensate water in a certain low-pressure heater through a low-temperature economizer, which leads to the fact that when the thermal power unit adopts condensate water throttling for frequency modulation, the effect is not enough significant, and the condensate outlet temperature and the deaerator water level are still easy to exceed the safety boundary, and the frequency modulation duration is not long enough. The low-temperature economizer is realized by using flue gas heat storage, and the principle is to accurately adjust the fan frequency through the fan frequency increase and decrease speed, change the flue gas flow through the low-temperature economizer, thereby affecting the heat exchange amount of flue gas and condensate water, improving the frequency modulation duration and improving the frequency modulation effect. In the high frequency event, the flue gas fan frequency and flow are reduced; otherwise, the fan frequency and flow are increased.

[0039] In the application, the combination of one or more of the condensate-pump frequency increasing / decreasing speed and / or the fan frequency increasing / decreasing speed adjusting the condensate-steam direction flow regulating valve, the condensate-flue gas direction flow regulating valve and the fan frequency of the flue gas pipeline variable frequency fan, and then obtaining the power control result, further comprises: in the case of the current event being a low frequency event, closing the condensate-steam direction flow regulating valve according to the condensate-pump frequency increasing / decreasing speed while utilizing the flue gas heat storage; in response to the condensate-steam direction flow regulating valve being closed, the steam flow is reduced to a minimum value, and then the power control result of enhancing the power lifting effect is obtained.

[0040] In the case of the power grid frequency being less than a preset frequency threshold, it is judged that the current is a low frequency event. In the low frequency event, the valve (condensate-steam direction flow regulating valve) of the pipeline through which the condensate flows to the steam side of the low-pressure cylinder is closed while the flue gas heat storage is utilized. After the flue gas flow is increased, the heat exchange between the condensate and the steam side is bypassed, and then the steam flow can be reduced to a minimum value, thereby enhancing the power lifting effect.

[0041] In the low frequency event, the increase of the fan frequency can be performed simultaneously with the closing of the valve of the pipeline through which the condensate and the low-pressure cylinder steam pipeline, the flue gas flow through the low-temperature coal economizer is increased, the flue gas heat storage is utilized to reduce the condensate temperature reduction speed, the duration of the thermal power frequency modulation is prolonged, and the frequency modulation capacity is increased.

[0042] It should be noted that in the embodiment of the application, the adjustment of the condensate throttling condensate pump frequency is realized by adjusting the opening of the condensate-steam direction flow regulating valve. By changing the opening of the condensate-steam direction flow regulating valve, the pressure of the condensate is changed until the requirement of the condensate throttling condensate pump frequency change expected value is met.

[0043] Further, the adjustment of the fan frequency is to increase the fan frequency until the change expected value is reached.

[0044] The embodiment of the application utilizes the flue gas heat storage to improve the thermal power frequency modulation capacity and time, realizes the effect of closing the steam-condensate heat exchange branch, suppresses the influence of the low-pressure cylinder steam flow change on the condensate temperature, the deaerator water level and the like, and plays a role in stabilizing the operation stability of the unit frequency modulation process.

[0045] In the present application, the combination of one or more of the condensate pump frequency increase / decrease speed and / or the fan frequency increase / decrease speed adjusting the condensate-steam extraction direction flow regulating valve, the condensate-flue gas direction flow regulating valve, and the fan frequency of the flue gas pipeline variable frequency fan, and then obtaining the power control result, further comprises: in the case of the current event being a high frequency event, completely opening the condensate-steam extraction direction flow regulating valve according to the condensate pump frequency increase / decrease speed, and closing or completely closing the condensate-flue gas direction flow regulating valve according to the condensate pump frequency increase / decrease speed; in response to the condensate-steam extraction direction flow regulating valve being completely opened and the condensate-flue gas direction flow regulating valve being closed or completely closed, the steam extraction flow is increased to the maximum value, and then a power control result of reducing the power of the thermal power generating unit is obtained.

[0046] In the case that the grid frequency is not less than a preset frequency threshold, it is judged that the current is a high frequency event. In the high frequency event, the valve through which the condensate flows to the steam extraction side of the low-pressure cylinder (condensate-steam extraction direction flow regulating valve) is completely opened, and the valve through which the condensate flows to the flue gas direction (condensate-flue gas direction flow regulating valve) can also be closed or completely closed. After the flue gas flow is reduced, the heat exchange between the condensate and the flue gas side is bypassed, and then the steam extraction flow can be increased to the maximum value, so as to achieve the effect of reducing the power of the unit.

[0047] In the high frequency event, the reduction of the fan frequency can be performed simultaneously with the complete opening of the valve through which the condensate flows to the steam extraction side of the low-pressure cylinder and the closing or complete closing of the valve through which the condensate flows to the flue gas direction, so as to reduce the flow of the flue gas through the low-temperature coal economizer, and the steam extraction flow can be increased to the maximum value, thereby reducing the power of the unit. It should be pointed out that in the present application, the adjustment of the condensate throttling condensate pump frequency is realized by completely opening the condensate-steam extraction direction flow regulating valve and / or closing or completely closing the condensate-flue gas direction flow regulating valve. By changing the opening of the condensate-steam extraction direction flow regulating valve and the condensate-flue gas direction flow regulating valve, the pressure of the condensate is changed until the requirement of the condensate throttling condensate pump frequency change expected value is met.

[0048] Further, the adjustment of the fan frequency is directly reducing the fan frequency until the change expected value is reached.

[0049] Step 130: obtaining a frequency modulation result of completing the frequency modulation in the case that the power control result meets the power expected increment requirement of the thermal power generating unit.

[0050] It can be understood that the power of the unit can affect the frequency of the grid through the balance of supply and demand of the grid, so that whether the frequency modulation is completed can be judged through the power control result, so as to obtain the frequency modulation result. That is, the frequency modulation result includes whether the frequency modulation is completed this time.

[0051] Specifically, in the case that the power control result meets the power expected increment requirement of the thermal power unit, the frequency modulation is completed, and a frequency modulation result of completed frequency modulation is obtained.

[0052] Further, in the case that the power control result does not meet the power expected increment requirement of the thermal power unit, the frequency modulation is not completed, and a frequency modulation result of failed frequency modulation is obtained, and then the step 120 needs to be repeated until the power control result meets the power expected increment requirement of the thermal power unit.

[0053] The method comprises the following steps: in response to the power grid frequency difference exceeding a dead zone, starting a steam turbine governor system; based on the steam turbine governor system, calculating a power expected increment of the thermal power unit, a condensate throttling condensate pump frequency change expected value and a fan frequency change expected value of a flue gas pipeline variable frequency fan according to the power grid frequency difference; controlling a combination of one or more of a condensate-steam direction flow regulating valve, a condensate-flue gas direction flow regulating valve and a fan frequency of the flue gas pipeline variable frequency fan according to the condensate throttling condensate pump frequency change expected value and the fan frequency change expected value, and then obtaining a power control result; wherein the flue gas pipeline variable frequency fan is installed in a flue gas pipeline of a low-temperature economizer section of the thermal power unit, the condensate-steam direction flow regulating valve is installed in a pipeline in which condensate flows to a steam extraction side of a low-pressure cylinder, and the condensate-flue gas direction flow regulating valve is installed in a pipeline in which condensate flows to a flue gas direction; in the case that the power control result meets the power expected increment requirement of the thermal power unit, a frequency modulation result of completed frequency modulation is obtained. According to the expected value, the flow regulating valve and the fan frequency are controlled, so as to affect steam extraction flow, and then affect unit power, and finally complete frequency modulation, so that the flue gas heat storage frequency modulation of the thermal power unit is realized, and the frequency modulation effect is remarkable and the safety hidden danger is smaller.

[0054] The power frequency regulation device of the thermal power generating unit with the low-temperature economizer provided by the present application is described below, and the power frequency regulation device of the thermal power generating unit with the low-temperature economizer described below can be correspondingly referred to the power frequency regulation method of the thermal power generating unit with the low-temperature economizer described above. As shown in FIG. 3, the device comprises: an information unit 410, configured to start a steam turbine governor system in response to the grid frequency difference exceeding a dead zone, and calculate a thermal power generating unit power expected increment, a condensate throttling condensate pump frequency change expected value and a fan frequency change expected value of a flue gas duct variable frequency fan based on the steam turbine governor system according to the grid frequency difference; a control unit 420, configured to control a combination of one or more of a condensate-steam direction flow regulating valve, a condensate-flue gas direction flow regulating valve and a fan frequency of the flue gas duct variable frequency fan according to the condensate throttling condensate pump frequency change expected value and the fan frequency change expected value, so as to obtain a power control result; wherein the flue gas duct variable frequency fan is installed in a flue gas duct of a low-temperature economizer section of the thermal power generating unit, the condensate-steam direction flow regulating valve is installed in a pipeline where condensate of the thermal power generating unit flows to a steam extraction side of a low-pressure cylinder, and the condensate-flue gas direction flow regulating valve is installed in a pipeline where condensate of the thermal power generating unit flows to a flue gas direction; and a result unit 430, configured to obtain a power frequency regulation completion result in a case where the power control result meets a requirement of the thermal power generating unit power expected increment.

[0055] wherein the control unit issues the condensate throttling condensate pump frequency and the fan frequency through an electro-hydraulic servo mechanism; calculates a condensate pump frequency increasing / decreasing speed according to the condensate throttling condensate pump frequency change expected value, and calculates a fan frequency increasing / decreasing speed according to the fan frequency change expected value; adjusts a combination of one or more of the condensate-steam direction flow regulating valve, the condensate-flue gas direction flow regulating valve and the fan frequency of the flue gas duct variable frequency fan according to the condensate pump frequency increasing / decreasing speed and / or the fan frequency increasing / decreasing speed, so as to obtain a power control result; and calculates set values required by a deaerator water level, a pressure and a condensate outlet temperature in a case where flue gas heat storage is released.

[0056] wherein the adjusting a combination of one or more of the condensate-steam direction flow regulating valve, the condensate-flue gas direction flow regulating valve and the fan frequency of the flue gas duct variable frequency fan according to the condensate pump frequency increasing / decreasing speed and / or the fan frequency increasing / decreasing speed, so as to obtain a power control result, specifically comprises: in a case where a current event is a low-frequency event, increasing the fan frequency according to the fan frequency increasing / decreasing speed; and in response to the fan frequency increasing, increasing flue gas flow, so as to obtain a power control result with enhanced power lifting effect.

[0057] The combination of one or more of the condensate pump frequency increasing / decreasing speed and / or the fan frequency increasing / decreasing speed adjusting the condensate-steam extraction direction flow regulating valve, the condensate-flue gas direction flow regulating valve and the fan frequency of the flue gas pipeline variable frequency fan, and then obtaining the power control result, specifically comprising: in the case of the current event being a high frequency event, the fan frequency is reduced according to the fan frequency increasing / decreasing speed; in response to the reduction of the fan frequency, the flue gas flow is reduced, and then the power control result of reducing the power of the thermal power generating unit is obtained.

[0058] The combination of one or more of the condensate pump frequency increasing / decreasing speed and / or the fan frequency increasing / decreasing speed adjusting the condensate pump frequency increasing / decreasing speed and / or the fan frequency increasing / decreasing speed adjusting the condensate-steam extraction direction flow regulating valve, the condensate-flue gas direction flow regulating valve and the fan frequency of the flue gas pipeline variable frequency fan, and then obtaining the power control result, further comprising: in the case of the current event being a low frequency event, while utilizing flue gas heat storage, the condensate-steam extraction direction flow regulating valve is closed according to the condensate pump frequency increasing / decreasing speed; in response to the closing of the condensate-steam extraction direction flow regulating valve, the steam extraction flow is reduced to a minimum value, and then the power control result of enhancing the power lifting effect is obtained.

[0059] The combination of one or more of the condensate pump frequency increasing / decreasing speed and / or the fan frequency increasing / decreasing speed adjusting the condensate pump frequency increasing / decreasing speed and / or the fan frequency increasing / decreasing speed adjusting the condensate-steam extraction direction flow regulating valve, the condensate-flue gas direction flow regulating valve and the fan frequency of the flue gas pipeline variable frequency fan, and then obtaining the power control result, further comprising: in the case of the current event being a high frequency event, the condensate-steam extraction direction flow regulating valve is completely opened according to the condensate pump frequency increasing / decreasing speed, and the condensate-flue gas direction flow regulating valve is closed or completely closed according to the condensate pump frequency increasing / decreasing speed; in response to the complete opening of the condensate-steam extraction direction flow regulating valve and the closing or complete closing of the condensate-flue gas direction flow regulating valve, the steam extraction flow is increased to a maximum value, and then the power control result of reducing the power of the thermal power generating unit is obtained.

[0060] The application provides a thermal power generating unit flue gas heat storage frequency modulation device comprising a low-temperature economizer, which comprises the following steps: starting a steam turbine governor system in response to an electric grid frequency difference exceeding a dead zone; calculating a thermal power generating unit power expected increment, a condensate throttling condensate pump frequency change expected value and a flue gas pipeline variable frequency fan fan frequency change expected value based on the steam turbine governor system according to the electric grid frequency difference; controlling one or more of a combination of a condensate-steam extraction direction flow regulating valve, a condensate-flue gas direction flow regulating valve and a flue gas pipeline variable frequency fan fan frequency according to the condensate throttling condensate pump frequency change expected value and the fan frequency change expected value, thereby obtaining a power control result; wherein the flue gas pipeline variable frequency fan is installed in a flue gas pipeline of a low-temperature economizer section of the thermal power generating unit, the condensate-steam extraction direction flow regulating valve is installed in a pipeline where condensate flows to a steam extraction side of a low-pressure cylinder, and the condensate-flue gas direction flow regulating valve is installed in a pipeline where condensate flows to a flue gas direction; obtaining a frequency modulation completion frequency modulation result when the power control result meets the thermal power generating unit power expected increment requirement. The application controls the flow regulating valve and the fan frequency according to the expected value, thereby affecting the steam extraction flow, further affecting the unit power, finally completing the frequency modulation, and realizing the thermal power generating unit flue gas heat storage frequency modulation with remarkable frequency modulation effect and fewer safety hazards.

[0061] Fig. 4 shows an example of an entity structure diagram of an electronic device, as shown in Fig. 4, which can include a processor 510, a communications interface 520, a memory 530, and a communications bus 540, wherein the processor 510, the communications interface 520, and the memory 530 communicate with each other through the communications bus 540. The processor 510 can invoke the logic instructions in the memory 530 to execute the method for flue gas heat storage frequency modulation of thermal power generating unit containing a low-temperature economizer, which includes: in response to the grid frequency difference exceeding the dead zone, starting the steam turbine governor system, calculating the power expected increment of the thermal power generating unit, the condensate throttling condensate pump frequency change expected value, and the fan frequency change expected value of the flue gas duct variable frequency fan based on the steam turbine governor system according to the grid frequency difference; controlling the combination of one or more of the condensate-steam direction flow regulating valve, the condensate-flue gas direction flow regulating valve, and the fan frequency of the flue gas duct variable frequency fan according to the condensate throttling condensate pump frequency change expected value and the fan frequency change expected value, thereby obtaining a power control result; wherein the flue gas duct variable frequency fan is installed in the flue gas duct of the low-temperature economizer section of the thermal power generating unit, the condensate-steam direction flow regulating valve is installed in the pipe where the condensate of the thermal power generating unit flows to the steam extraction side of the low-pressure cylinder, and the condensate-flue gas direction flow regulating valve is installed in the pipe where the condensate of the thermal power generating unit flows to the flue gas direction; in the case where the power control result meets the requirement of the power expected increment of the thermal power generating unit, obtaining a frequency modulation result of frequency modulation completion.

[0062] In addition, the logic instructions in the memory 530 described above can be implemented in the form of a software function unit and sold or used as an independent product, which can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or part of the technical solutions can be embodied in the form of a software product, which is stored in a storage medium, including a plurality of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0063] In another aspect, the present application also provides a computer program product, which comprises a computer program, the computer program being stored in a non-transitory computer readable storage medium, and the computer program being executable by a processor to enable a computer to perform the method for flue gas heat storage frequency modulation of a thermal power generating unit comprising a low-temperature economizer, the method comprising: in response to a grid frequency difference exceeding a dead zone, starting a turbine governor system, calculating a thermal power generating unit power expected increment, a condensate throttling condensate pump frequency change expected value and a flue gas duct variable frequency fan fan frequency change expected value based on the turbine governor system according to the grid frequency difference; controlling a combination of one or more of a condensate-steam direction flow regulating valve, a condensate-flue gas direction flow regulating valve and a fan frequency of the flue gas duct variable frequency fan according to the condensate throttling condensate pump frequency change expected value and the fan frequency change expected value, thereby obtaining a power control result; wherein the flue gas duct variable frequency fan is installed in a flue gas duct of a low-temperature economizer section of the thermal power generating unit, the condensate-steam direction flow regulating valve is installed in a pipeline where condensate of the thermal power generating unit flows to a steam extraction side of a low-pressure cylinder, and the condensate-flue gas direction flow regulating valve is installed in a pipeline where condensate of the thermal power generating unit flows to a flue gas direction; and obtaining a frequency modulation completion result in a case where the power control result meets a requirement of the thermal power generating unit power expected increment.

[0064] In another aspect, the present application also provides a non-transitory computer readable storage medium, which stores a computer program, the computer program being executable by a processor to implement a method for flue gas heat storage frequency modulation of a thermal power generating unit comprising a low-temperature economizer, the method comprising: in response to a grid frequency difference exceeding a dead zone, starting a turbine governor system, calculating a thermal power generating unit power expected increment, a condensate throttling condensate pump frequency change expected value and a flue gas duct variable frequency fan fan frequency change expected value based on the turbine governor system according to the grid frequency difference; controlling a combination of one or more of a condensate-steam direction flow regulating valve, a condensate-flue gas direction flow regulating valve and a fan frequency of the flue gas duct variable frequency fan according to the condensate throttling condensate pump frequency change expected value and the fan frequency change expected value, thereby obtaining a power control result; wherein the flue gas duct variable frequency fan is installed in a flue gas duct of a low-temperature economizer section of the thermal power generating unit, the condensate-steam direction flow regulating valve is installed in a pipeline where condensate of the thermal power generating unit flows to a steam extraction side of a low-pressure cylinder, and the condensate-flue gas direction flow regulating valve is installed in a pipeline where condensate of the thermal power generating unit flows to a flue gas direction; and obtaining a frequency modulation completion result in a case where the power control result meets a requirement of the thermal power generating unit power expected increment.

[0065] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed to multiple network units. Part or all of the modules can be selected to achieve the purposes of the embodiments according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0066] Through the description of the above embodiments, those skilled in the art can clearly understand that the embodiments can be realized by means of software and the necessary general hardware platform, and of course can also be realized by hardware. Based on such understanding, the above technical solutions can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in each embodiment or some parts of the embodiments.

[0067] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for flue gas heat storage frequency modulation of a thermal power generating unit comprising a low-temperature economizer, characterized in that, The method comprises the following steps: in response to the grid frequency difference exceeding a dead zone, starting a steam turbine governor system, and calculating a power expected increment of a thermal power unit, a condensate pump frequency change expected value of a condensate throttling condensate pump and a fan frequency change expected value of a flue gas duct variable frequency fan based on the steam turbine governor system according to the grid frequency difference; controlling a combination of one or more of a condensate-steam extraction direction flow regulating valve, a condensate-flue gas direction flow regulating valve and a fan frequency of the flue gas duct variable frequency fan according to the condensate pump frequency change expected value and the fan frequency change expected value, so as to obtain a power control result; wherein the flue gas duct variable frequency fan is installed in a flue gas duct of a low-temperature economizer section of the thermal power unit, the condensate-steam extraction direction flow regulating valve is installed in a pipeline in which condensate of the thermal power unit flows to a steam extraction side of a low-pressure cylinder, and the condensate-flue gas direction flow regulating valve is installed in a pipeline in which condensate of the thermal power unit flows to a flue gas direction; in a case where the power control result meets a requirement of the power expected increment of the thermal power unit, obtaining a frequency modulation result of frequency modulation completion.

2. The method according to claim 1, wherein the low-temperature economizer is a low-temperature economizer. The step of controlling the combination of one or more of the condensate-steam extraction direction flow regulating valve, the condensate-flue gas direction flow regulating valve and the fan frequency of the flue gas duct variable frequency fan according to the condensate pump frequency change expected value and the fan frequency change expected value, so as to obtain the power control result, specifically comprises the following steps: issuing the condensate pump frequency and the fan frequency through an electro-hydraulic servo mechanism; calculating a condensate pump frequency increasing / decreasing speed according to the condensate pump frequency change expected value, and calculating a fan frequency increasing / decreasing speed according to the fan frequency change expected value; adjusting the combination of one or more of the condensate-steam extraction direction flow regulating valve, the condensate-flue gas direction flow regulating valve and the fan frequency of the flue gas duct variable frequency fan according to the condensate pump frequency increasing / decreasing speed and / or the fan frequency increasing / decreasing speed, so as to obtain the power control result; in a case where flue gas heat storage release is completed, calculating set values required by a deaerator water level, a pressure and a condensate outlet temperature.

3. The method according to claim 2, wherein the low-temperature economizer is a low-temperature economizer. The step of adjusting the combination of one or more of the condensate-steam extraction direction flow regulating valve, the condensate-flue gas direction flow regulating valve and the fan frequency of the flue gas duct variable frequency fan according to the condensate pump frequency increasing / decreasing speed and / or the fan frequency increasing / decreasing speed, so as to obtain the power control result, specifically comprises the following steps: in a case where a current event is a low-frequency event, increasing the fan frequency according to the fan frequency increasing / decreasing speed; in response to the fan frequency increasing, flue gas flow increasing, so as to obtain a power control result of enhanced power lifting effect.

4. The method according to claim 2, wherein the low-temperature economizer is a low-temperature economizer. The step of adjusting the combination of one or more of the condensate-steam extraction direction flow regulating valve, the condensate-flue gas direction flow regulating valve and the fan frequency of the flue gas duct variable frequency fan according to the condensate pump frequency increasing / decreasing speed and / or the fan frequency increasing / decreasing speed, so as to obtain the power control result, specifically comprises the following steps: in a case where a current event is a high-frequency event, decreasing the fan frequency according to the fan frequency increasing / decreasing speed; In response to the fan frequency being reduced, the flue gas flow is reduced, and a power control result of reducing the power of the thermal power generating unit is obtained.

5. The method of Claim 3, wherein the low-temperature economizer is a low-temperature economizer. The combination of the condensate pump frequency change rate and / or the fan frequency change rate and the combination of the condensate-steam direction flow regulating valve, the condensate-flue gas direction flow regulating valve and the fan frequency of the flue gas duct variable frequency fan are adjusted, and a power control result is obtained. In the case of a low frequency event, the condensate-steam direction flow regulating valve is closed according to the condensate pump frequency change rate while the flue gas heat storage is utilized. In response to the condensate-steam direction flow regulating valve being closed, the steam flow is reduced to a minimum value, and a power control result of enhancing the power lifting effect is obtained.

6. The method of Claim 4, wherein the low-temperature economizer is a low-temperature economizer. The combination of the condensate pump frequency change rate and / or the fan frequency change rate and the combination of the condensate-steam direction flow regulating valve, the condensate-flue gas direction flow regulating valve and the fan frequency of the flue gas duct variable frequency fan are adjusted, and a power control result is obtained. In the case of a high frequency event, the condensate-steam direction flow regulating valve is fully opened according to the condensate pump frequency change rate, and the condensate-flue gas direction flow regulating valve is closed or fully closed according to the condensate pump frequency change rate. In response to the condensate-steam direction flow regulating valve being fully opened and the condensate-flue gas direction flow regulating valve being closed or fully closed, the steam flow is increased to a maximum value, and a power control result of reducing the power of the thermal power generating unit is obtained.

7. A thermal power generating unit flue gas heat storage frequency modulation device comprising a low-temperature economizer, characterized in that, The information unit is configured to start a steam turbine governor system in response to the grid frequency difference exceeding a dead zone, and calculate a thermal power generating unit power expected increment, a condensate pump frequency change expected value and a fan frequency change expected value of a flue gas duct variable frequency fan based on the steam turbine governor system according to the grid frequency difference. The control unit is configured to control a combination of one or more of the condensate-steam direction flow regulating valve, the condensate-flue gas direction flow regulating valve and the fan frequency of the flue gas duct variable frequency fan according to the condensate pump frequency change expected value and the fan frequency change expected value, and obtain a power control result. The result unit is configured to obtain a frequency modulation result of completing frequency modulation in the case that the power control result meets the requirement of the thermal power generating unit power expected increment. The processor executes the program to implement the flue gas heat storage frequency modulation method of the thermal power generating unit containing the low-temperature economizer according to any one of claims 1 to 6.

8. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The computer program is executed by the processor to implement the flue gas heat storage frequency modulation method of the thermal power generating unit containing the low-temperature economizer according to any one of claims 1 to 6. 9.A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that, ​ 10. A computer program product comprising a computer program, characterized in that, The computer program is executed by a processor to implement the flue gas heat storage frequency modulation method of the thermal power generating unit containing the low-temperature economizer according to any one of claims 1 to 6.

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