A power station intelligent control system and method based on thermal power units

Abstract

The present invention relates to the technical field of power supply control, and specifically to an intelligent control system and method for a power station based on a thermal power unit, comprising: a power grid feedback module, a cabin separation module, a quality monitoring module, a steam output module and a feeding control module, wherein the power grid feedback module is used to evaluate power grid demand and calculate boiler gas pressure, the cabin separation module is used to recover tail gas and separate boiler cabins, the quality monitoring module is used to calculate a steam output function and a driving steam volume, the steam output module is used to mix steam from two cabins, and the feeding control module is used to adjust a fuel feeding speed and parameters of steam in the cabin. The present invention can optimize the energy consumption of a thermal power unit, improve energy utilization efficiency, enable a generator set to achieve stable and reliable power supply, and help improve the power generation efficiency of a thermal power station and reduce the operating cost of the power station.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply control, and in particular to an intelligent control system and method for a power station based on a thermal power unit. Background Art

[0002] Thermal power units are generators that use coal, gas and other fuels as energy sources. They are usually composed of boilers, steam turbines and generators. They burn fuel to generate high-temperature and high-pressure steam, and then use steam to drive turbine generators to generate electricity. They are an important part of thermal power stations. Since thermal power generation directly generates electricity for the power grid, additional excess power generation is required to ensure stable power supply, and batteries are used to store excess electricity, which causes a certain degree of power waste.

[0003] In addition, during the power generation process of thermal power units, the quality of the fuel, the quality of the water used for power generation and the life of the boiler all have a great impact on the stability of power generation. When the quality of the fuel and water sources is unstable, the steam pressure in the boiler will continue to fluctuate, which will not only affect the stable rotation of the generator turbine, but also easily affect the life of the thermal power unit.

[0004] The current thermal power control system adjusts the temperature in the boiler combustion chamber by controlling the feeding rate, thereby stabilizing the steam pressure in the boiler. However, it takes time for the change in feeding to the change in gas pressure. This method has a certain lag, and excessively high combustion temperature will also cause a large amount of scale to precipitate, affecting the quality of power generation. Summary of the invention

[0005] The object of the present invention is to provide an intelligent control system and method for a power station based on a thermal power unit to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: an intelligent control system for a power plant based on a thermal power unit, comprising: a power grid feedback module, a cabin separation module, a quality monitoring module, a steam output module and a feeding control module;

[0007] The grid feedback module is used to connect the battery of the power station to the grid, and when the battery power changes, the grid demand is evaluated according to the change rate, the expected power generation of the power station is calculated, and the steam pressure of the boiler of the thermal power unit is calculated based on the expected power generation;

[0008] The compartment separation module is used to separate the boiler into two compartments, calculate the recovery amount of tail gas according to the temperature of the tail gas of the thermal power unit boiler, introduce the tail gas into the first compartment and heat the first compartment to a predetermined temperature, and introduce the power generation water into the second compartment and heat it to boiling;

[0009] The quality monitoring module is used to calculate the steam output pressure according to the steam temperature of the second chamber, plot the change law of the steam output pressure over time, obtain the steam output function, monitor the stability of the steam output function, and calculate the driving steam amount according to the stability;

[0010] The steam output module is used to input the steam in the second compartment into the driving compartment, calculate the steam compensation function of the first compartment according to the steam output function and the gas parameters in the first compartment, extract steam from the first compartment according to the steam compensation function, mix it at the steam outlet of the driving compartment, and obtain stable blending steam;

[0011] The feeding control module is used to fit the correlation coefficient between the feeding speed and the steam pressure according to the historical steam output function and the historical feeding speed function in the second compartment, adjust the fuel feeding speed in combination with the air pressure drop rate in the first compartment, calculate the air pressure conversion ratio according to the fuel input amount, and adjust the predetermined temperature in the first compartment according to the air pressure conversion ratio.

[0012] Furthermore, the grid feedback module includes: a battery unit, a power demand unit and a gas pressure conversion unit;

[0013] The battery unit is used to store power from the power plant, balance power demand of the power grid, and provide feedback on changes in power of the power grid;

[0014] The power demand unit is used to determine the power demand of the power grid and calculate the expected power generation power of the power station according to the change of the power energy of the battery;

[0015] The gas pressure conversion unit is used to calculate the driving steam pressure of the boiler according to the expected power generation and the specification parameters of the thermal power unit.

[0016] Further, the cabin separation module includes: an exhaust gas recovery unit and a cabin heating unit;

[0017] The exhaust gas recovery unit is used to calculate the recovery amount of exhaust gas according to the temperature of the remaining exhaust gas after driving the turbine;

[0018] The cabin heating unit is used to divide the heating cabin of the boiler into two parts, introduce the exhaust gas into the first cabin and heat it to a predetermined temperature, and introduce the power generation water into the second cabin and heat it until the cabin air pressure reaches the desired power generation power.

[0019] Further, the quality monitoring module includes: a sensor unit and a stability monitoring unit;

[0020] The sensor unit is used to detect the air pressure of the cabin and the temperature of the steam;

[0021] The stability monitoring unit is used to generate a steam output function and calculate the steam amount of the second compartment driving turbine according to the stability of the steam output function.

[0022] Further, the steam output module includes: a steam conditioning unit and an output feedback unit;

[0023] The steam conditioning unit is used to mix the steam in the first chamber and the steam in the second chamber to generate driving steam for driving the turbine;

[0024] The output feedback unit is used to calculate the mixing amount of the gas in the first chamber according to the steam output function and the gas parameters in the first chamber.

[0025] Furthermore, the feeding control module includes: a fuel demand unit, a gas pressure conversion unit and a repeated heating unit;

[0026] The fuel demand unit is used to calculate the correlation coefficient between the feed amount and the steam pressure according to the historical steam output function and the feed rate in the boiler;

[0027] The air pressure conversion unit is used to adjust the fuel feeding speed according to the decreasing speed of the air pressure in the first chamber;

[0028] The repeated heating unit is used to calculate the gas pressure conversion ratio based on the amount of fuel input and adjust the heating parameters of the first chamber.

[0029] A method for intelligent control of a power plant based on a thermal power unit comprises the following steps:

[0030] Step S1. Connect the battery of the power station to the power grid, judge the power demand of the power grid according to the change of the battery power, and calculate the expected power generation of the power station, and then calculate the driving steam pressure of the boiler of the thermal power unit according to the expected power generation;

[0031] Step S2. The boiler of the thermal power unit is divided into two independent compartments, the exhaust gas generated after the steam-driven turbine is introduced into the first compartment, and after the first compartment is heated to a predetermined temperature, the power generation water is introduced into the second compartment for heating, and the steam pressure at the air outlet of the second compartment is detected by a sensor until the air pressure in the second compartment reaches the driving steam pressure described in step S1 for the first time;

[0032] Step S3. Record the change of steam pressure in the second compartment over time to obtain a steam output function, calculate the driving steam volume according to the stability of the steam output function, and deliver the corresponding volume of steam to the driving compartment;

[0033] Step S4. Calculate the steam compensation function of the first compartment according to the steam output function and the gas parameters in the first compartment, extract steam from the first compartment to the driving compartment according to the steam compensation function, mix to obtain stable blended steam, and output the blended steam to drive the turbine;

[0034] Step S5. Calculate the correlation between the feeding rate and the steam pressure in the second compartment according to the steam output function and the historical feeding rate of the feeding port, adjust the fuel feeding rate by adjusting the correlation, and update the exhaust gas recovery amount according to the drop in air pressure in the first compartment to keep the temperature of the first compartment constant.

[0035] Further, step S1 includes:

[0036] Step S11. Connect the battery to the power grid, monitor the change of the battery power, calculate the difference between the power generation power and the grid power according to the change of the battery power and the change speed, convert the difference into a signal and feed it back to the thermal power unit;

[0037] Step S12. Obtain the current turbine speed of the thermal power unit and the steam pressure in the driving cabin, calculate the expected power generation power when the power station meets the grid demand based on the difference between the power generation power and the grid power, and calculate the expected turbine speed when the grid demand power is reached based on the specification parameters between the turbine speed and the output power;

[0038] Step S13. Calculate the driving steam pressure when the expected turbine speed is reached based on the historical driving steam pressure and turbine speed, and record it as the driving steam pressure of the boiler.

[0039] This step can match the power generation of the thermal power unit with the demand of the power grid, avoiding the waste of electricity caused by excessive power generation.

[0040] Further, step S2 includes:

[0041] Step S21. Separate the boiler of the thermal power unit into two independent compartments, namely the first compartment and the second compartment, wherein the second compartment is connected to the combustion chamber of the unit, and the first compartment is heated by a heating wire alone;

[0042] Step S22. The exhaust gas generated by the driving turbine is introduced from the tail of the steam turbine. After the temperature of the exhaust gas is detected, the exhaust gas is introduced into the first chamber. The volume of the introduced exhaust gas is calculated according to the following formula:

[0043] ;

[0044] Wherein, V1 represents the volume of the introduced tail gas, P1 represents the driving steam pressure of the boiler, P0 represents the preset pressure parameter, V0 represents the volume of the first chamber, T0 represents the predetermined temperature of the first chamber, P2 represents the standard atmospheric pressure, T1 represents the temperature of the tail gas, and after the tail gas is introduced, the first chamber is heated to the predetermined temperature;

[0045] Step S23. Introduce the water for power generation into the second compartment, use the energy of the combustion chamber to heat the second compartment, set a detection device at the air outlet of the second compartment, calculate the steam pressure and steam temperature in the second compartment according to the steam flow rate, and when it is detected that the steam pressure in the second compartment reaches the driving steam pressure of the boiler in step S1, go to step S3.

[0046] This step can form two complementary air pressure areas by independently heating the gas in the two compartments, so that the steam pressure that actually drives the turbine remains constant.

[0047] Further, step S3 includes:

[0048] Step S31. Record the pressure of the steam in the second chamber in real time, take time as the independent variable and steam pressure as the dependent variable, and generate a steam output function P(t), where t represents time;

[0049] Step S32. Detect the stability of the steam pressure in the second chamber according to the stability calculation method, the stability calculation method is as follows:

[0050] ;

[0051] Where a represents the stability of the steam pressure in the second compartment, tc represents the current moment, t0 is the preset time delay, and P1 represents the driving steam pressure of the boiler;

[0052] Step S33. According to the stability of the steam output function, the driving steam volume V2 is calculated, wherein V2=V3·a, wherein V3 represents the capacity of the driving compartment, and the steam of volume V2 is pre-transported from the second compartment to the driving compartment.

[0053] This step can adjust the driving ratio of each compartment according to the actual operation of the thermal power unit, so as to balance the steam pressure of the driving compartment and prevent the steam imbalance caused by the exhaustion of steam in the first compartment.

[0054] Further, step S4 includes:

[0055] Step S41. Calculate the steam compensation function of the first chamber according to the steam output function of the second chamber and the gas parameters in the first chamber:

[0056] ;

[0057] Where V(t) represents the steam compensation function of the first chamber, T2 represents the temperature of the steam in the second chamber, and T0 represents the predetermined temperature of the first chamber;

[0058] Step S42: outputting the steam in the first air chamber to the driving chamber according to the steam compensation function, and mixing the steam from the first chamber and the second chamber in the driving chamber;

[0059] Step S43. Open the air outlet of the driving chamber to drive the generator turbine to generate electricity, and make the steam compensation function change in real time with the detected steam output function, and continue to receive steam output from the first chamber and the second chamber.

[0060] This step can overcome the hysteresis of the original control system, enable the generator set to achieve stable and reliable power supply, and solve the problem of unstable boiler steam output.

[0061] Further, step S5 includes:

[0062] Step S51. Obtain the function R(t) of the feeding speed of the feeding port over time, and calculate the correlation coefficient between the feeding speed and the steam output function P(t) according to the steam output function P(t) of the second chamber in the same time period:

[0063] ;

[0064] Where W represents the correlation coefficient, t1 is the preset delay, COD is the rounding function, and tc is the current time;

[0065] Step S52. Estimate the correlation coefficient and adjust the feeding speed R(tc) of the feeding port at the current moment so that R(tc)=W·P(tc), where P(tc) represents the pressure of the steam in the second chamber at the current moment;

[0066] Step S53. Calculate the air pressure in the first compartment according to the steam compensation function of the first compartment. When the air pressure in the first compartment drops to a threshold value, recalculate the exhaust gas recovery amount according to the method of step S22, and introduce compressed exhaust gas into the first compartment to keep the temperature of the first compartment at a predetermined temperature T0.

[0067] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0068] The present invention can calculate the expected operating power of the thermal power unit according to the power consumed by the electricity in the battery, so as to match the power generation of the thermal power unit with the demand of the power grid, avoid the waste of electricity caused by excessive power generation, optimize the energy consumption of the thermal power unit, reduce energy waste, improve energy utilization efficiency, and thus reduce operating costs and environmental impacts.

[0069] The present invention can place the low-temperature exhaust gas generated after driving the turbine and the steam generated by heating the water for power generation in different compartments for heating. When the boiler pressure needs to be adjusted, the steam in the two compartments is mixed, and after reaching the output standard, the steam is input into the steam turbine together, thus overcoming the lag of the original control system, enabling the generator set to achieve stable and reliable power supply, and improving the intelligence level of the thermal power station.

[0070] The present invention can intelligently adjust the fuel feeding speed and adjust the proportion of steam at different temperatures in the cabin according to the conversion ratio of the fuel and the gas pressure in the boiler, thereby solving the problem of unstable boiler steam output caused by unstable fuel quality, and helping to improve the power generation efficiency of thermal power plants and reduce operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0072] Figure 1 It is a structural schematic diagram of an intelligent control system for a power station based on a thermal power unit according to the present invention;

[0073] Figure 2 The present invention is a schematic diagram of the steps of an intelligent control method for a power station based on a thermal power unit. DETAILED DESCRIPTION

[0074] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0075] See also Figure 1 , the present invention provides a technical solution: an intelligent control system for a power station based on a thermal power unit, comprising: a power grid feedback module, a cabin separation module, a quality monitoring module, a steam output module and a feeding control module;

[0076] The grid feedback module is used to connect the battery of the power station to the grid, and when the battery power changes, the grid demand is evaluated according to the change rate, the expected power generation of the power station is calculated, and the steam pressure of the boiler of the thermal power unit is calculated based on the expected power generation;

[0077] The grid feedback module includes: a battery unit, a power demand unit and a gas pressure conversion unit;

[0078] The battery unit is used to store power from the power plant, balance power demand of the power grid, and provide feedback on changes in power of the power grid;

[0079] The power demand unit is used to determine the power demand of the power grid and calculate the expected power generation power of the power station according to the change of the power energy of the battery;

[0080] The gas pressure conversion unit is used to calculate the driving steam pressure of the boiler according to the expected power generation and the specification parameters of the thermal power unit.

[0081] The compartment separation module is used to separate the boiler into two compartments, calculate the recovery amount of tail gas according to the temperature of the tail gas of the thermal power unit boiler, introduce the tail gas into the first compartment and heat the first compartment to a predetermined temperature, and introduce the power generation water into the second compartment and heat it to boiling;

[0082] The cabin separation module includes: an exhaust gas recovery unit and a cabin heating unit;

[0083] The exhaust gas recovery unit is used to calculate the recovery amount of exhaust gas according to the temperature of the remaining exhaust gas after driving the turbine;

[0084] The cabin heating unit is used to divide the heating cabin of the boiler into two parts, introduce the exhaust gas into the first cabin and heat it to a predetermined temperature, and introduce the power generation water into the second cabin and heat it until the cabin air pressure reaches the desired power generation power.

[0085] The quality monitoring module is used to calculate the steam output pressure according to the steam temperature of the second chamber, plot the change law of the steam output pressure over time, obtain the steam output function, monitor the stability of the steam output function, and calculate the driving steam amount according to the stability;

[0086] The quality monitoring module includes: a sensor unit and a stability monitoring unit;

[0087] The sensor unit is used to detect the air pressure of the cabin and the temperature of the steam;

[0088] The stability monitoring unit is used to generate a steam output function and calculate the steam amount of the second compartment driving turbine according to the stability of the steam output function.

[0089] The steam output module is used to input the steam in the second compartment into the driving compartment, calculate the steam compensation function of the first compartment according to the steam output function and the gas parameters in the first compartment, extract steam from the first compartment according to the steam compensation function, mix it at the steam outlet of the driving compartment, and obtain stable blending steam;

[0090] The steam output module includes: a steam conditioning unit and an output feedback unit;

[0091] The steam conditioning unit is used to mix the steam in the first chamber and the steam in the second chamber to generate driving steam for driving the turbine;

[0092] The output feedback unit is used to calculate the mixing amount of the gas in the first chamber according to the steam output function and the gas parameters in the first chamber.

[0093] The feeding control module is used to fit the correlation coefficient between the feeding speed and the steam pressure according to the historical steam output function and the historical feeding speed function in the second compartment, adjust the fuel feeding speed in combination with the air pressure drop rate in the first compartment, calculate the air pressure conversion ratio according to the fuel input amount, and adjust the predetermined temperature in the first compartment according to the air pressure conversion ratio.

[0094] The feeding control module includes: a fuel demand unit, a gas pressure conversion unit and a repeated heating unit;

[0095] The fuel demand unit is used to calculate the correlation coefficient between the feed amount and the steam pressure according to the historical steam output function and the feed rate in the boiler;

[0096] The air pressure conversion unit is used to adjust the fuel feeding speed according to the decreasing speed of the air pressure in the first chamber;

[0097] The repeated heating unit is used to calculate the gas pressure conversion ratio based on the amount of fuel input and adjust the heating parameters of the first chamber.

[0098] like Figure 2 As shown, a power plant intelligent control method based on a thermal power unit comprises the following steps:

[0099] Step S1. Connect the battery of the power station to the power grid, judge the power demand of the power grid according to the change of the battery power, and calculate the expected power generation of the power station, and then calculate the driving steam pressure of the boiler of the thermal power unit according to the expected power generation;

[0100] Step S1 includes:

[0101] Step S11. Connect the battery to the power grid, monitor the change of the battery power, calculate the difference between the power generation power and the grid power according to the change of the battery power and the change speed, convert the difference into a signal and feed it back to the thermal power unit;

[0102] Step S12. Obtain the current turbine speed of the thermal power unit and the steam pressure in the driving cabin, calculate the expected power generation power when the power station meets the grid demand based on the difference between the power generation power and the grid power, and calculate the expected turbine speed when the grid demand power is reached based on the specification parameters between the turbine speed and the output power;

[0103] Step S13. Calculate the driving steam pressure when the expected turbine speed is reached based on the historical driving steam pressure and turbine speed, and record it as the driving steam pressure of the boiler.

[0104] Step S2. The boiler of the thermal power unit is divided into two independent compartments, the exhaust gas generated after the steam-driven turbine is introduced into the first compartment, and after the first compartment is heated to a predetermined temperature, the power generation water is introduced into the second compartment for heating, and the steam pressure at the air outlet of the second compartment is detected by a sensor until the air pressure in the second compartment reaches the driving steam pressure described in step S1 for the first time;

[0105] Step S2 includes:

[0106] Step S21. Separate the boiler of the thermal power unit into two independent compartments, namely the first compartment and the second compartment, wherein the second compartment is connected to the combustion chamber of the unit, and the first compartment is heated by a heating wire alone;

[0107] Step S22. The exhaust gas generated by the driving turbine is introduced from the tail of the steam turbine. After the temperature of the exhaust gas is detected, the exhaust gas is introduced into the first chamber. The volume of the introduced exhaust gas is calculated according to the following formula:

[0108] ;

[0109] Wherein, V1 represents the volume of the introduced tail gas, P1 represents the driving steam pressure of the boiler, P0 represents the preset pressure, V0 represents the volume of the first chamber, T0 represents the preset temperature of the first chamber, P2 represents the standard atmospheric pressure, T1 represents the temperature of the tail gas, and after the tail gas is introduced, the first chamber is heated to the preset temperature;

[0110] Step S23. Introduce the water for power generation into the second compartment, use the energy of the combustion chamber to heat the second compartment, set a detection device at the air outlet of the second compartment, calculate the steam pressure and steam temperature in the second compartment according to the steam flow rate, and when it is detected that the steam pressure in the second compartment reaches the driving steam pressure of the boiler in step S1, go to step S3.

[0111] Step S3. Record the change of steam pressure in the second compartment over time to obtain a steam output function, calculate the driving steam volume according to the stability of the steam output function, and deliver the corresponding volume of steam to the driving compartment;

[0112] Step S3 includes:

[0113] Step S31. Record the pressure of the steam in the second chamber in real time, take time as the independent variable and steam pressure as the dependent variable, and generate a steam output function P(t), where t represents time;

[0114] Step S32. Detect the stability of the steam pressure in the second chamber according to the stability calculation method, the stability calculation method is as follows:

[0115] ;

[0116] Where a represents the stability of the steam pressure in the second compartment, tc represents the current moment, t0 is the preset time delay, and P1 represents the driving steam pressure of the boiler;

[0117] Step S33. According to the stability of the steam output function, the driving steam volume V2 is calculated, wherein V2=V3·a, wherein V3 represents the capacity of the driving compartment, and the steam of volume V2 is pre-transported from the second compartment to the driving compartment.

[0118] Step S4. Calculate the steam compensation function of the first compartment according to the steam output function and the gas parameters in the first compartment, extract steam from the first compartment to the driving compartment according to the steam compensation function, mix to obtain stable blended steam, and output the blended steam to drive the turbine;

[0119] Step S4 includes:

[0120] Step S41. Calculate the steam compensation function of the first chamber according to the steam output function of the second chamber and the gas parameters in the first chamber:

[0121] ;

[0122] Where V(t) represents the steam compensation function of the first chamber, T2 represents the temperature of the steam in the second chamber, and T0 represents the predetermined temperature of the first chamber;

[0123] Step S42: outputting the steam in the first air chamber to the driving chamber according to the steam compensation function, and mixing the steam from the first chamber and the second chamber in the driving chamber;

[0124] Step S43. Open the air outlet of the driving chamber to drive the generator turbine to generate electricity, and make the steam compensation function change in real time with the detected steam output function, and continue to receive steam output from the first chamber and the second chamber.

[0125] Step S5. Calculate the correlation between the feeding rate and the steam pressure in the second compartment according to the steam output function and the historical feeding rate of the feeding port, adjust the fuel feeding rate by adjusting the correlation, and update the exhaust gas recovery amount according to the drop in air pressure in the first compartment to keep the temperature of the first compartment constant.

[0126] Step S5 includes:

[0127] Step S51. Obtain the function R(t) of the feeding speed of the feeding port over time, and calculate the correlation coefficient between the feeding speed and the steam output function P(t) according to the steam output function P(t) of the second chamber in the same time period:

[0128] ;

[0129] Where W represents the correlation coefficient, t1 is the preset delay, COD is the rounding function, and tc is the current time;

[0130] Step S52. Estimate the correlation coefficient and adjust the feeding speed R(tc) of the feeding port at the current moment so that R(tc)=W·P(tc), where P(tc) represents the pressure of the steam in the second chamber at the current moment;

[0131] Step S53. Calculate the air pressure in the first compartment according to the steam compensation function of the first compartment. When the air pressure in the first compartment drops to a threshold value, recalculate the exhaust gas recovery amount according to the method of step S22, and introduce compressed exhaust gas into the first compartment to keep the temperature of the first compartment at a predetermined temperature T0.

[0132] Example: At a certain moment, the battery generates a power output of 45KW. The current output power of the thermal power unit is 200KW. According to the turbine parameters of the thermal power unit, when the power of the thermal power unit is increased to 245KW, the pressure of the driving turbine steam is 490KPa. The boiler is divided into two compartments. The volume of the first compartment is 50m 3 The volume of the second chamber is 200m3, the exhaust gas temperature is 127℃, and the preset temperature is 327℃, so the recovered exhaust gas volume is 75m 3 After heating to the predetermined temperature, the pressure output in the second chamber is detected to be 450KPa at the current moment, and 15m3 of liquid is extracted from the first chamber. 3 The gas is mixed with the output steam from the second compartment so that the mixed steam pressure reaches 490KPa to stably drive the turbine.

[0133] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0134] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A power plant intelligent control method based on thermal power units, characterized in that: The method comprises the following steps: Step S1. Connect the battery of the power station to the power grid, judge the power demand of the power grid according to the change of the battery power, and calculate the expected power generation of the power station, and then calculate the driving steam pressure of the boiler of the thermal power unit according to the expected power generation; Step S2. The boiler of the thermal power unit is divided into two independent compartments, the exhaust gas generated after the steam-driven turbine is introduced into the first compartment, and after the first compartment is heated to a predetermined temperature, the power generation water is introduced into the second compartment for heating, and the steam pressure at the air outlet of the second compartment is detected by a sensor until the air pressure in the second compartment reaches the driving steam pressure described in step S1 for the first time; Step S3. Record the change of steam pressure in the second compartment over time to obtain a steam output function, calculate the driving steam volume according to the stability of the steam output function, and deliver the corresponding volume of steam to the driving compartment; Step S4. Calculate the steam compensation function of the first compartment according to the steam output function and the gas parameters in the first compartment, extract steam from the first compartment to the driving compartment according to the steam compensation function, mix to obtain stable blended steam, and output the blended steam to drive the turbine; Step S5. Calculate the correlation between the feeding speed and the steam pressure in the second compartment according to the steam output function and the historical feeding speed of the feeding port, adjust the fuel feeding speed by adjusting the correlation, and update the tail gas recovery amount according to the decrease in the air pressure in the first compartment, so that the temperature of the first compartment remains constant; Step S4 includes: Step S41. Calculate the steam compensation function of the first chamber according to the steam output function of the second chamber and the gas parameters in the first chamber: ； Wherein V(t) represents the steam compensation function of the first compartment, T2 represents the temperature of the steam in the second compartment, T0 represents the predetermined temperature of the first compartment, P1 represents the driving steam pressure of the boiler, V2 represents the driving steam quantity, and P(t) is the steam output function, wherein the steam output function takes the steam pressure in the second compartment as the dependent variable and takes time as the independent variable; Step S42: outputting the steam in the first air chamber to the driving chamber according to the steam compensation function, and mixing the steam from the first chamber and the second chamber in the driving chamber; Step S43. Open the air outlet of the driving chamber to drive the generator turbine to generate electricity, and make the steam compensation function change in real time with the detected steam output function, and continue to receive steam output from the first chamber and the second chamber.

2. The intelligent control method for a power plant based on a thermal power unit according to claim 1, characterized in that: Step S1 includes: Step S11. Connect the battery to the power grid, monitor the change of the battery power, calculate the difference between the power generation power and the grid power according to the change of the battery power and the change speed, convert the difference into a signal and feed it back to the thermal power unit; Step S12. Obtain the current turbine speed of the thermal power unit and the steam pressure in the driving cabin, calculate the expected power generation power when the power station meets the grid demand based on the difference between the power generation power and the grid power, and calculate the expected turbine speed when the grid demand power is reached based on the specification parameters between the turbine speed and the output power; Step S13. Calculate the driving steam pressure when the desired turbine speed is reached based on the historical driving steam pressure and turbine speed, and record it as the driving steam pressure of the boiler; Step S2 includes: Step S21. Separate the boiler of the thermal power unit into two independent compartments, namely the first compartment and the second compartment, wherein the second compartment is connected to the combustion chamber of the unit, and the first compartment is heated by a heating wire alone; Step S22. The exhaust gas generated by the driving turbine is introduced from the tail of the steam turbine. After the temperature of the exhaust gas is detected, the exhaust gas is introduced into the first chamber. The volume of the introduced exhaust gas is calculated according to the following formula: ； Wherein, V1 represents the volume of the introduced tail gas, P1 represents the driving steam pressure of the boiler, P0 represents the preset pressure parameter, V0 represents the volume of the first chamber, T0 represents the predetermined temperature of the first chamber, P2 represents the standard atmospheric pressure, T1 represents the temperature of the tail gas, and after the tail gas is introduced, the first chamber is heated to the predetermined temperature; Step S23. Introduce the water for power generation into the second compartment, use the energy of the combustion chamber to heat the second compartment, set a detection device at the air outlet of the second compartment, calculate the steam pressure and steam temperature in the second compartment according to the steam flow rate, and when it is detected that the steam pressure in the second compartment reaches the driving steam pressure of the boiler in step S1, go to step S3.

3. The intelligent control method for a power station based on a thermal power unit according to claim 2 is characterized in that: Step S3 includes: Step S31. Record the pressure of the steam in the second chamber in real time, take time as the independent variable and steam pressure as the dependent variable, and generate a steam output function P(t), where t represents time; Step S32. Detect the stability of the steam pressure in the second chamber according to the stability calculation method, the stability calculation method is as follows: ； Wherein, a represents the stability of the steam pressure in the second chamber, tc represents the current moment, t0 is the first preset time delay, and P1 represents the driving steam pressure of the boiler; Step S33. According to the stability of the steam output function, the driving steam volume V2 is calculated, wherein V2=V3·a, wherein V3 represents the capacity of the driving compartment, and the steam of volume V2 is pre-transported from the second compartment to the driving compartment.

4. The intelligent control method for a power plant based on a thermal power unit according to claim 3 is characterized in that: Step S5 includes: Step S51. Obtain the function R(t) of the feeding speed of the feeding port over time, and calculate the correlation coefficient between the feeding speed and the steam output function P(t) according to the steam output function P(t) of the second chamber in the same time period: ； Wherein, W represents the correlation coefficient, t1 is the second preset delay, COD is the rounding function, and tc is the current time; Step S52. Estimate the correlation coefficient and adjust the feeding speed R(tc) of the feeding port at the current moment so that R(tc)=W·P(tc), where P(tc) represents the pressure of the steam in the second chamber at the current moment; Step S53. Calculate the air pressure in the first compartment according to the steam compensation function of the first compartment. When the air pressure in the first compartment drops to a threshold value, recalculate the exhaust gas recovery amount according to the method of step S22, and introduce compressed exhaust gas into the first compartment to keep the temperature of the first compartment at a predetermined temperature T0.

5. An intelligent control system for a power plant based on a thermal power plant, the system executing the intelligent control method for a power plant based on a thermal power plant as claimed in claim 1, characterized in that: The system includes the following modules: a power grid feedback module, a cabin separation module, a quality monitoring module, a steam output module and a feeding control module; The grid feedback module is used to connect the battery of the power station to the grid, and when the battery power changes, the grid demand is evaluated according to the change rate, the expected power generation of the power station is calculated, and the steam pressure of the boiler of the thermal power unit is calculated based on the expected power generation; The compartment separation module is used to separate the boiler into two compartments, calculate the recovery amount of tail gas according to the temperature of the tail gas of the thermal power unit boiler, introduce the tail gas into the first compartment and heat the first compartment to a predetermined temperature, and introduce the power generation water into the second compartment and heat it to boiling; The quality monitoring module is used to calculate the steam output pressure according to the steam temperature of the second chamber, plot the change law of the steam output pressure over time, obtain the steam output function, monitor the stability of the steam output function, and calculate the driving steam amount according to the stability; The steam output module is used to input the steam in the second compartment into the driving compartment, calculate the steam compensation function of the first compartment according to the steam output function and the gas parameters in the first compartment, extract steam from the first compartment according to the steam compensation function, mix it at the steam outlet of the driving compartment, and obtain stable blending steam; The feeding control module is used to fit the correlation coefficient between the feeding speed and the steam pressure according to the historical steam output function and the historical feeding speed function in the second chamber, adjust the feeding speed of the fuel in combination with the decreasing speed of the air pressure in the first chamber, calculate the air pressure conversion ratio according to the input amount of the fuel, and adjust the predetermined temperature in the first chamber according to the air pressure conversion ratio; The steam output module includes: a steam conditioning unit and an output feedback unit; The steam conditioning unit is used to mix the steam in the first chamber and the steam in the second chamber to generate driving steam for driving the turbine; The output feedback unit is used to calculate the mixing amount of the gas in the first cabin according to the steam output function and the gas parameters in the first cabin; The feeding control module includes: a fuel demand unit, a gas pressure conversion unit and a repeated heating unit; The fuel demand unit is used to calculate the correlation coefficient between the feed amount and the steam pressure according to the historical steam output function and the feed rate in the boiler; The air pressure conversion unit is used to adjust the fuel feeding speed according to the decreasing speed of the air pressure in the first chamber; The repeated heating unit is used to calculate the gas pressure conversion ratio based on the amount of fuel input and adjust the heating parameters of the first chamber.

6. The intelligent control system for a power plant based on a thermal power unit according to claim 5 is characterized in that: The grid feedback module includes: a battery unit, a power demand unit and a gas pressure conversion unit; The battery unit is used to store power from the power plant, balance power demand of the power grid, and provide feedback on changes in power of the power grid; The power demand unit is used to determine the power demand of the power grid and calculate the expected power generation power of the power station according to the change of the power energy of the battery; The gas pressure conversion unit is used to calculate the driving steam pressure of the boiler according to the expected power generation and the specification parameters of the thermal power unit.

7. The intelligent control system for a power plant based on a thermal power unit according to claim 6 is characterized by: The cabin separation module includes: an exhaust gas recovery unit and a cabin heating unit; The exhaust gas recovery unit is used to calculate the recovery amount of exhaust gas according to the temperature of the remaining exhaust gas after driving the turbine; The cabin heating unit is used to divide the heating cabin of the boiler into two parts, introduce the exhaust gas into the first cabin and heat it to a predetermined temperature, and introduce the power generation water into the second cabin and heat it until the cabin air pressure reaches the desired power generation power; The quality monitoring module includes: a sensor unit and a stability monitoring unit; The sensor unit is used to detect the air pressure of the cabin and the temperature of the steam; The stability monitoring unit is used to generate a steam output function and calculate the steam amount of the second compartment driving turbine according to the stability of the steam output function.

Images