A method and system for double-channel rapid correction of coal heat value of a thermal power unit

Abstract

The application discloses a coal-fired thermal value double-channel fast correction method and system for a thermal power unit, which comprises the following steps: based on the direct energy balance principle, the released energy HR of a boiler and the required energy DEB of a steam turbine are calculated; according to the released energy of the boiler and the required energy deviation of the steam turbine, a first channel regulator is designed to calculate the theoretical coal quantity signal required for eliminating the deviation; according to the processed theoretical coal quantity signal required for eliminating the energy deviation of the boiler and the steam turbine, a second channel regulator is designed to calculate the correction coefficient of the coal-fired thermal value; the total coal quantity after correction is calculated, and enters the coal master control closed-loop regulation. According to the energy balance state change of the boiler and the steam turbine, the real-time automatic correction of the coal-fired thermal value is realized, the method can be suitable for AGC and deep peak regulation working conditions, has good rapidity and robustness, and helps the flexible, intelligent, safe and efficient operation of the thermal power unit.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automation, in particular to a coal-fired thermal value double-channel fast correction method and system for thermal power generating units. BACKGROUND

[0002] In order to better accommodate new energy power generation and guarantee the safety and stability of the power grid, the main power source gradually changes to an auxiliary service type power source. The power grid also puts forward higher requirements for the response capability and deep peak regulation capability of the "two rules" of the thermal power generating unit: the thermal power generating unit not only needs to be able to rise to the rated load, but also needs to be able to drop to 20% of the rated load or even lower, and needs to be able to rise and drop quickly, that is, it needs to have a super-wide load deep peak regulation capability and meet the "two rules" examination requirements. In this process, real-time correction of the coal-fired thermal value is crucial and is a key point of flexible operation of the thermal power generating unit.

[0003] Currently, there are mainly two ways to control the correction coefficient of the coal-fired thermal value of the thermal power generating unit: 1. The operating personnel manually set the thermal value correction coefficient. This method actually plays a coal quantity biasing function and cannot automatically correct according to the actual change of the coal-fired thermal value, which on the one hand leads to a delayed response of the coordinated control system to the change of the coal-fired thermal value, and on the other hand increases the workload of the operating personnel and easily leads to misoperation, which poses a safety hazard. 2. Single-loop thermal value correction PID control, the set value is the design coal quantity corresponding to the load instruction, the controlled variable is the corrected total coal quantity, the difference between the controlled variable and the set value is input into the thermal value correction PID loop for operation, and the output value is the thermal value correction coefficient. This coefficient is multiplied by the actual instantaneous total coal quantity to obtain the corrected coal quantity, and the corrected total coal quantity is sent back to the thermal value correction PID loop for operation and also input into the coal main control loop for operation. This method can play a certain role in thermal value correction, but has large hysteresis and great limitations, mainly manifested in that when the unit is in a steady state, the thermal value correction loop will not start working until the energy imbalance occurs in the furnace, the coal feeder speed changes due to the change of the coal supply instruction, and the actual instantaneous coal supply quantity of each coal feeder changes. When the unit is in a variable load condition, the actual instantaneous total coal quantity is in an "excess" or "deficiency" state due to the existence of the pre-coal addition loop. Although there is a deviation between the corrected total coal quantity and the design coal quantity, the corrected total coal quantity cannot represent the actual level of the coal-fired thermal value, so the thermal value correction loop cannot be put into use. SUMMARY

[0004] This section is intended to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification of the present application to avoid obscuring the purpose of this section, the abstract and the title, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0005] In view of the above and / or existing problems in the coal-fired thermal value correction coefficient control mode of the thermal power unit, the present application is proposed.

[0006] Therefore, the problem to be solved by the present application is how to automatically, quickly and accurately correct the fluctuation of the coal-fired thermal value, improve the regulation ability of the unit load and improve the stability of the key parameters.

[0007] To solve the above technical problems, the present application provides the following technical solutions:

[0008] In the first aspect, the present application provides a double-channel quick correction method for the coal-fired thermal value of the thermal power unit, which comprises collecting real-time data; calculating the boiler release energy HR and the steam turbine demand energy DEB based on the direct energy balance principle; designing a first channel regulator according to the boiler release energy HR and the steam turbine demand energy DEB deviation signal, and calculating the theoretical coal quantity signal required to eliminate the deviation; designing a second channel regulator according to the theoretical coal quantity signal, and calculating the coal-fired thermal value correction coefficient; calculating the total coal quantity after correction, and entering the coal main control closed-loop regulation.

[0009] As a preferred scheme of the double-channel quick correction method for the coal-fired thermal value of the thermal power unit, the real-time data comprises the drum pressure, the actual main steam pressure, the main steam pressure set value, the regulation stage pressure, the boiler main control feedforward instruction and the actual instantaneous total coal quantity.

[0010] As a preferred scheme of the double-channel quick correction method for the coal-fired thermal value of the thermal power unit, the formula for calculating the boiler release energy HR is as follows:

[0011]

[0012] The formula for calculating the steam turbine demand energy DEB is as follows:

[0013] DEB=(1+d(P1*P4 / P3) / dt)*P1*P4 / P3

[0014] Wherein, P1 is the regulation stage pressure, P2 is the drum pressure, P3 is the main steam pressure, and P4 is the pressure set value.

[0015] As a preferred scheme of the method for quickly correcting the coal heat value of a thermal power unit in two channels, the deviation calculation includes the following steps: the boiler released energy signal HR and the steam turbine required energy signal DEB are sent to a subtractor module, the boiler released energy signal HR is the minuend, the steam turbine required energy signal DEB is the subtrahend, and the difference is the unit furnace energy deviation signal; the unit furnace energy deviation signal is sent to a first channel PID regulator as the regulated variable, and the set value is 0; the first channel PID regulator calculates the input deviation by using a proportional integral derivative control law, and outputs the theoretical coal quantity signal required for eliminating the unit furnace energy deviation.

[0016] As a preferred scheme of the method for quickly correcting the coal heat value of a thermal power unit in two channels, the judgment process of the theoretical coal quantity signal includes: when the theoretical coal quantity signal is 0, it represents that the current coal heat value is the design heat value, and the current actual coal quantity is the design coal quantity; when the theoretical coal quantity signal is positive, it represents that the current coal quality is poor, and the first channel PID regulator needs to output a positive coal quantity to maintain the unit furnace energy balance; when the theoretical coal quantity signal is negative, it represents that the current coal quality is good, and the first channel PID regulator needs to output a negative coal quantity to maintain the unit furnace energy balance.

[0017] As a preferred scheme of the method for quickly correcting the coal heat value of a thermal power unit in two channels, the second channel regulator is designed according to the theoretical coal quantity signal, and the steps for calculating the coal heat value correction coefficient are as follows: the theoretical coal quantity signal required for eliminating the unit furnace energy deviation is comprehensively processed to obtain the processed theoretical coal quantity signal required for eliminating the unit furnace energy deviation; the processed theoretical coal quantity signal required for eliminating the unit furnace energy deviation is sent to a second channel PID regulator as the regulated variable, and the set value is 0; the second channel PID regulator calculates the input deviation by using a pure integral control law, and outputs the real-time coal heat value correction coefficient.

[0018] As a preferred scheme of the method for quickly correcting the coal heat value of a thermal power unit in two channels, the judgment process of the real-time coal heat value correction coefficient includes: when the real-time coal heat value correction coefficient is 1, it represents the design coal; when the real-time coal heat value correction coefficient is less than 1, it represents that the current coal heat value is poor, and the actual coal quantity required under the same load variation range is greater than the corresponding design coal quantity; when the real-time coal heat value correction coefficient is greater than 1, it represents that the current coal heat value is good, and the actual coal quantity required under the same load variation range is less than the corresponding design coal quantity; the real-time coal heat value correction coefficient is processed by using a high-low limit amplitude processing method, the low limit is 0.8, and the high limit is 1.2.

[0019] In a second aspect, to further solve the problems in the coal heat value correction coefficient control mode of the thermal power generating unit, the embodiment of the present application provides a coal heat value double-channel fast correction system for a thermal power generating unit, which comprises a real-time acquisition module, which is used for acquiring the drum pressure, the actual main steam pressure, the main steam pressure set value, the regulation stage pressure, the boiler main control feedforward instruction and the actual instantaneous total coal amount in real time; a calculation module, which is used for calculating the sum, difference, product and multiple of the input 1 signal and the input 2 signal; a first-order filter module, which is used for filtering the input signal to remove the high-frequency noise or low-frequency noise in the signal; a first-order differential module, which is used for obtaining the change rate of the input signal; a function module, which is used for performing high-low limiting and threshold judgment processing on the input signal; and a PID module, which is used for performing proportional, integral and differential operations on the input signal.

[0020] In a third aspect, the embodiment of the present application provides a computer device, which comprises a memory and a processor, and the memory stores a computer program, wherein the processor implements any step of the coal heat value double-channel fast correction method for a thermal power generating unit according to the first aspect of the present application when executing the computer program.

[0021] In a fourth aspect, the embodiment of the present application provides a computer readable storage medium, which stores a computer program, wherein the computer program is executed by a processor to implement any step of the coal heat value double-channel fast correction method for a thermal power generating unit according to the first aspect of the present application.

[0022] The present application has the following beneficial effects: based on the direct energy balance principle, the present application can monitor the energy deviation level of the boiler in real time; the first channel PID regulator is designed to calculate the theoretical coal amount signal required to eliminate the energy deviation of the boiler in real time; the theoretical coal amount signal required to eliminate the energy deviation of the boiler can be comprehensively processed; the second channel PID regulator is designed to calculate the coal heat value correction coefficient in real time; the present application can realize the real-time automatic correction of the coal heat value according to the energy balance state change of the boiler, and can be suitable for AGC and deep peak regulation working conditions, and has good rapidity and robustness, thereby helping the flexible, intelligent, safe and efficient operation of the thermal power generating unit. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them:

[0024] Fig. 1 It is the principle diagram of the coal heat value double-channel fast correction method for a thermal power generating unit in embodiment 1.

[0025] Fig. 2A flow chart of the method for double-channel fast correction of the coal heat value of a thermal power unit in Example 1.

[0026] Fig. 3 A schematic diagram of the method for processing the theoretical coal amount signal required for eliminating the deviation of the energy balance of the boiler and the turbine in Example 1. DETAILED DESCRIPTION

[0027] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0028] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the concept of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0029] Secondly, the "one embodiment" or "embodiment" referred to herein means that a specific feature, structure or characteristic can be included in at least one implementation of the present application. The "in one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an embodiment that is independent of or mutually exclusive with other embodiments.

[0030] Example 1

[0031] Reference Figs. 1-3 For the first embodiment of the present application, the embodiment provides a method for double-channel fast correction of the coal heat value of a thermal power unit, comprising the following steps:

[0032] S1: Collecting real-time acquired data.

[0033] Preferably, the real-time acquired data includes the drum pressure (steam-water separator outlet pressure for a once-through boiler), the actual main steam pressure, the main steam pressure set value, the regulation stage pressure, the boiler main control feedforward instruction and the actual instantaneous total coal amount.

[0034] S2: Calculating the boiler released energy HR and the turbine required energy DEB based on the direct energy balance principle.

[0035] Preferably, the formula for calculating the boiler released energy HR is as follows:

[0036]

[0037] The formula for the turbine required energy DEB is as follows:

[0038] DEB = (1 + d (P1*P4 / P3) / dt) *P1*P4 / P3

[0039] Wherein, P1 is the adjusting stage pressure, P2 is the drum pressure (steam-water separator outlet pressure for once-through boiler), P3 is the main steam pressure, and P4 is the pressure setting.

[0040] S3: calculating the theoretical coal quantity signal required for eliminating the deviation according to the boiler released energy HR and the deviation signal of the steam turbine required energy DEB.

[0041] Further, the deviation calculation comprises the following steps: sending the boiler released energy signal HR and the steam turbine required energy signal DEB into a subtractor module, the boiler released energy signal HR being the minuend and the steam turbine required energy signal DEB being the subtrahend, and the difference being the boiler-turbine energy deviation signal; sending the boiler-turbine energy deviation signal as the regulated quantity into a first channel PID regulator (counteraction), with the set value being 0, and the first channel PID regulator calculating the input deviation with proportional-integral-derivative control law and outputting the theoretical coal quantity signal required for eliminating the boiler-turbine energy deviation.

[0042] Further, when the theoretical coal quantity signal is 0, it represents that the current coal calorific value is the design value, and the current actual coal quantity is the design coal quantity; when the theoretical coal quantity signal is positive, it represents that the current coal quality is poor, and the first channel PID regulator needs to output positive coal quantity to maintain the boiler-turbine energy balance; when the theoretical coal quantity signal is negative, it represents that the current coal quality is good, and the first channel PID regulator needs to output negative coal quantity to maintain the boiler-turbine energy balance.

[0043] S4: designing a second channel regulator according to the theoretical coal quantity signal to calculate the coal calorific value correction coefficient.

[0044] Specifically, the steps of designing a second channel regulator according to the theoretical coal quantity signal to calculate the coal calorific value correction coefficient are as follows: comprehensively processing the theoretical coal quantity signal required for eliminating the boiler-turbine energy deviation to obtain the processed theoretical coal quantity signal required for eliminating the boiler-turbine energy deviation; sending the processed theoretical coal quantity signal required for eliminating the boiler-turbine energy deviation as the regulated quantity into a second channel PID regulator, with the set value being 0, and the second channel PID regulator calculating the input deviation with pure integral control law and outputting the coal calorific value real-time correction coefficient.

[0045] Wherein, the coal calorific value real-time correction coefficient includes the following cases: when the coal calorific value real-time correction coefficient is 1, it is the design coal; when the coal calorific value real-time correction coefficient is less than 1, it means that the current coal calorific value is poor, and under the same load variation range, the actual coal quantity required is greater than the corresponding design coal quantity; when the coal calorific value real-time correction coefficient is greater than 1, it means that the current coal calorific value is good, and under the same load variation range, the actual coal quantity required is less than the corresponding design coal quantity; and the coal calorific value real-time correction coefficient is processed with high and low limits, with the low limit being 0.8 and the high limit being 1.2.

[0046] Further, the step of comprehensive processing includes: Fig. 3 As shown, it includes: firstly, smoothing processing, specifically, the theoretical coal quantity signal required for eliminating the energy deviation of the boiler is first input into a first-order filter module, the filtered value is used as the minuend, the first-order differential of the filtered value is used as the subtrahend to enter the subtracter; secondly, high and low amplitude limiting processing, to improve the safety and reliability of the adjustment system, the low limit of the design signal is-20% of the rated coal quantity, and the high limit is 20% of the rated coal quantity; finally, threshold judgment processing, when the theoretical coal quantity signal required for eliminating the energy deviation of the boiler is small, it can be considered that the energy of the boiler is basically balanced, the signal is greater than-1% of the rated coal quantity and less than 1% of the rated coal quantity, and 0 is output, at this time, the heat value correction loop is suspended, which can ensure that the actual coal heat value is basically consistent with the design coal heat value, can avoid frequent operation of the regulator, and is helpful to improve the robustness of the adjustment system; finally, the processed theoretical coal quantity signal required for eliminating the energy deviation of the boiler is obtained.

[0047] S5: Calculate the corrected total coal quantity, and enter the coal master control closed-loop adjustment.

[0048] The step of calculating the corrected total coal quantity is: the coal heat value correction coefficient and the actual instantaneous total coal quantity are input into a multiplier, so as to obtain the corrected total coal quantity.

[0049] Further, the boiler master control feedforward instruction and the first PID regulator output instruction are input into an adder to calculate the total coal quantity instruction; the corrected total coal quantity and the total coal quantity instruction are input into a subtracter, wherein the corrected total coal quantity is the minuend, and the total coal quantity instruction is the subtrahend, the real-time coal quantity deviation is calculated and input into the coal master control PID regulator (counteraction) to adjust the coal feeder speed instruction, so as to control the actual instantaneous coal quantity of each coal feeder; the actual instantaneous coal quantities of each coal feeder are added to calculate the actual instantaneous total coal quantity.

[0050] The embodiment also provides a coal-fired thermal power unit coal heat value double-channel fast correction system, which comprises a real-time acquisition module, which is used for acquiring the steam pocket pressure, the actual main steam pressure, the main steam pressure set value, the regulation stage pressure, the boiler master control feedforward instruction and the actual instantaneous total coal quantity in real time; a calculation module, which is used for calculating the sum, difference, product and multiple of the input 1 signal and the input 2 signal; a first-order filter module, which is used for filtering the input signal to remove high-frequency noise or low-frequency noise in the signal; a first-order differential module, which is used for obtaining the change rate of the input signal; a function module, which is used for high and low amplitude limiting and threshold judgment processing of the input signal; and a PID module, which is used for proportional, integral and differential operation of the input signal.

[0051] The embodiment also provides a computer device suitable for the coal-fired thermal power unit coal heat value double-channel fast correction method, which comprises:

[0052] The memory is configured to store computer-executable instructions, and the processor is configured to execute the computer-executable instructions to implement the method for double-channel fast correction of the coal-fired heat value of a thermal power unit as described in the above embodiments.

[0053] The computer device can be a terminal, and the computer device includes a processor, a memory, a communication interface, a display screen and an input device connected through a system bus. The processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for running the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is configured to perform wired or wireless communication with external terminals. The wireless communication can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer overlaid on the display screen, or a key, trackball or touchpad arranged on the shell of the computer device, or an external keyboard, touchpad or mouse, etc.

[0054] The embodiment also provides a storage medium having a computer program stored thereon, and the program is executed by a processor to implement the method for double-channel fast correction of the coal-fired heat value of a thermal power unit as described in the above embodiments.

[0055] To sum up, the present application is based on the direct energy balance principle, and real-time monitoring of the boiler energy deviation level is achieved. A first channel PID regulator is designed to calculate the theoretical coal quantity signal required to eliminate the boiler energy deviation in real time according to the boiler energy deviation level. The theoretical coal quantity signal required to eliminate the boiler energy deviation is comprehensively processed, including smoothing processing, high and low amplitude limiting and threshold judgment, to obtain the processed theoretical coal quantity signal required to eliminate the boiler energy deviation. A second channel PID regulator is designed to calculate the coal-fired heat value correction coefficient in real time according to the processed theoretical coal quantity signal required to eliminate the boiler energy deviation. Compared with the prior art, the method for double-channel fast correction of the coal-fired heat value of a thermal power unit can realize real-time automatic correction of the coal-fired heat value according to the change of the boiler energy balance state, can be suitable for AGC and deep peak regulation conditions, has good rapidity and robustness, and helps the flexible, intelligent, safe and efficient operation of the thermal power unit.

[0056] Embodiment 2

[0057] Referring to Table 1, the second embodiment of the present application is provided on the basis of the first embodiment, and comparative data of the present experiment, manual control and single-loop control are provided to verify the beneficial effects.

[0058] The double-channel fast correction provided by the present application has the following comparison data with the existing manual control and single-loop control as shown in the following table:

[0059] Table 1 Comparison data of double-channel fast correction control with existing manual control and single-loop control

[0060]

[0061] As shown in the above table, the double-channel fast correction method provided by the present application is based on the principle of direct energy balance, and compared with the existing method of judging according to the experience of operating personnel and the deviation of designed coal quantity and actual coal quantity, the present application has the characteristics of more accuracy by relying on scientific calculation; and in the actual coal heat value response speed, the present application greatly improves the response speed; in the control robustness, adaptation to start-stop grinding conditions, adaptation to variable load conditions and adaptation to deep peak regulation conditions, the present application has more practical operability compared with the prior art; more importantly, the present application does not have the problem of safety hidden danger.

[0062] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A method for double-channel rapid correction of coal heat value of a thermal power unit, characterized in that: The utility model relates to a boiler-turbine energy balance control system based on real-time coal calorific value correction, comprising, collecting real-time data; calculating the boiler released energy HR and the steam turbine required energy DEB based on the direct energy balance principle; designing a first channel regulator according to the boiler released energy HR and the steam turbine required energy DEB deviation signal to calculate the theoretical coal quantity signal required to eliminate the deviation; designing a second channel regulator according to the theoretical coal quantity signal to calculate the coal calorific value correction coefficient; calculating the corrected total coal quantity and entering the coal main control closed loop regulation; the deviation calculation comprises the following steps: sending the boiler released energy signal HR and the steam turbine required energy signal DEB into a subtracter module, wherein the boiler released energy signal HR is the minuend, the steam turbine required energy signal DEB is the subtrahend, and the difference is the boiler-turbine energy deviation signal; sending the boiler-turbine energy deviation signal as the regulated variable into a first channel PID regulator, and setting the value as 0; the first channel PID regulator calculates the input deviation with the proportional integral differential control law, and outputs the theoretical coal quantity signal required to eliminate the boiler-turbine energy deviation; the steps of designing a second channel regulator according to the theoretical coal quantity signal to calculate the coal calorific value correction coefficient are as follows: comprehensively processing the theoretical coal quantity signal required to eliminate the boiler-turbine energy deviation to obtain the processed theoretical coal quantity signal required to eliminate the boiler-turbine energy deviation; sending the processed theoretical coal quantity signal required to eliminate the boiler-turbine energy deviation as the regulated variable into a second channel PID regulator, and setting the value as 0; the second channel PID regulator calculates the input deviation with the pure integral control law, and outputs the coal calorific value real-time correction coefficient; the judgment process of the coal calorific value real-time correction coefficient comprises, when the coal calorific value real-time correction coefficient is 1, it is the design coal; when the coal calorific value real-time correction coefficient is less than 1, the current coal calorific value is poor, and under the same variable load amplitude, the actual coal quantity required is greater than the corresponding design coal quantity; when the coal calorific value real-time correction coefficient is greater than 1, the current coal calorific value is good, and under the same variable load amplitude, the actual coal quantity required is less than the corresponding design coal quantity; performing high-low limit amplitude processing on the coal calorific value real-time correction coefficient, wherein the low limit is 0.8 and the high limit is 1.2; the comprehensive processing comprises: performing smoothing processing, specifically, the theoretical coal quantity signal required to eliminate the boiler-turbine energy deviation first enters a first-order filter module, the filtered value is taken as the minuend, and the first-order differential of the filtered value is taken as the subtrahend to enter the subtracter; performing high-low limit amplitude processing, wherein the design signal low limit is -20% of the rated coal quantity and the high limit is 20% of the rated coal quantity; performing threshold judgment processing, when the theoretical coal quantity signal required to eliminate the boiler-turbine energy deviation is small, it can be considered that the boiler-turbine energy is basically balanced, the design signal is greater than -1% of the rated coal quantity and less than 1% of the rated coal quantity, and the output is 0, at this time, the coal calorific value correction loop is temporarily suspended.

2. The dual-pass rapid correction method for coal-fired heat value of a thermal power unit according to claim 1, characterized in that: the real-time data comprises the steam drum pressure, the actual main steam pressure, the main steam pressure set value, the regulation stage pressure, the boiler main control feedforward instruction and the actual instantaneous total coal quantity.

3. The dual-pass rapid correction method for coal-fired heat value of a thermal power unit according to claim 1, characterized in that: the formula for calculating the boiler released energy HR is as follows: the formula for calculating the steam turbine required energy DEB is as follows: DEB=(1+d(P1*P4 / P3) / dt)*P1*P4 / P3 Wherein, P1 is the adjusting stage pressure, P2 is the drum pressure, P3 is the main steam pressure, and P4 is the pressure setting.

4. The dual-pass rapid correction method for coal heat value of a thermal power unit according to claim 3, characterized in that: The judgment process of the theoretical coal amount signal comprises: When the theoretical coal amount signal is 0, it represents that the current coal calorific value is the design calorific value, and the current actual coal supply amount is the design coal supply amount; When the theoretical coal amount signal is positive, it represents that the current coal quality is poor, and the first channel PID regulator needs to output positive coal amount to maintain the boiler-turbine energy balance; When the theoretical coal amount signal is negative, it represents that the current coal quality is good, and the first channel PID regulator needs to output negative coal amount to maintain the boiler-turbine energy balance.

5. A dual-channel fast correction system for coal heat value of a thermal power unit, characterized in that, The method of claim 1 comprises: a real-time acquisition module for acquiring the drum pressure, the actual main steam pressure, the main steam pressure setting value, the adjusting stage pressure, the boiler main control feedforward instruction and the actual instantaneous total coal amount in real time; a calculation module for calculating the sum, difference, product and multiple of the input 1 signal and the input 2 signal; a first-order filter module for filtering the input signal to remove high-frequency noise or low-frequency noise in the signal; a first-order differential module for obtaining the change rate of the input signal; a function module for performing high-low amplitude limiting and threshold judgment processing on the input signal; a PID module for performing proportional, integral and differential operations on the input signal.

6. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that: The processor executes the computer program to realize the steps of the method of any one of claims 1-4.

7. A computer readable storage medium having stored thereon a computer program, characterized in that: The computer program is executed by the processor to realize the steps of the method of any one of claims 1-4.

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