CN113359428A - Supercritical unit fuel calorific value correction control method based on dynamic work coal ratio - Google Patents
Supercritical unit fuel calorific value correction control method based on dynamic work coal ratio Download PDFInfo
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Abstract
The invention relates to a supercritical unit fuel calorific value correction control method based on dynamic work coal ratio, which comprises the following steps: calculating the power-coal ratio loop by using the judging condition of the steady-state operation of the unit to obtain a steady-state power-coal ratio coefficient of the unit, and obtaining the basic coal amount of the unit under the current coal-fired heat value condition by performing product operation on the steady-state power-coal ratio coefficient and the current load instruction; when the heat value of the coal fired by the unit changes, the dynamic work coal ratio of the unit is corrected through work coal ratio correction triggering judgment, single correction coal amount latching, correction coal amount superposition and boiler master control reverse compensation of the work coal ratio correction coal amount. According to the invention, based on the function of replacing the f (x) function of the coal amount corresponding to the conventional load by the working coal ratio, the accuracy of the coal amount following the change can be ensured when the load changes, and meanwhile, the disturbance in the coal heat value correction process can be avoided.
Description
Technical Field
The invention belongs to the technical field of power generation, and particularly relates to a supercritical unit fuel calorific value correction control method based on a dynamic power-coal ratio.
Background
With the gradual popularization of new energy power generation, the proportion of new energy power generation increases year by year, and the new energy power generation amount is not stable due to the influence of multiple aspects such as seasons, sunshine, rainfall and the like. These factors will undoubtedly put higher demands on the peak regulation and frequency modulation capabilities of the thermal power generating unit, and the demands on the rapidity and stability of the load adjustment of the unit are also stricter. Along with the increase of unit operation age, factors such as equipment ageing, fault rate increase will be inevitable, and these will all cause bigger influence to the safe and stable operation of thermal power unit, and the fuel supply of thermal power unit still is in seller's market in addition, and the coal fired of power plant supply can't be guaranteed for the design coal type. The unfixed and random coal type entering the boiler causes great interference to a unit coordination control system, the traditional basic coal quantity instruction of the unit is a polygonal line function corresponding to a load instruction, the correction time of the existing coal heat value correction technology is about 2 hours, the requirement of an automatic unit control system cannot be met, after the coal heat value of the unit changes, all main parameters of the unit are in a fluctuation state along with the fluctuation of the coal quantity of the unit, particularly, metal fatigue is easily caused when the temperature rise rate of steam changes greatly, the generation of oxide skin is aggravated, pipe explosion is caused when the overtemperature is serious, and the water entering of a steam turbine is caused when the low temperature is serious. Therefore, a control method is urgently needed at present, the accuracy of coal-fired quantity proportioning can be met after the load of a unit changes, the correction time of coal-fired heat value correction can reach the minute level, and a unit coordination system is not or less affected by coal type changes.
The traditional coal proportioning mode is as follows: the basic coal quantity value in the coordination state is obtained by f (x) broken line function after the unit load instruction adds the heat load, the function relation is determined, the static fuel quantity corresponding to the unit load is obtained according to the designed coal heat value state in the initial stage of factory building, the value is the basic fuel quantity corresponding to the load, the function must be accurate, the boiler main control system can be ensured to carry out small coal quantity correction, and the stability of parameters such as the unit fuel quantity, the water supply flow, the total air quantity and the like can be ensured. If the existing coal type deviates from the designed coal type, the accuracy of the f (x) function cannot be ensured, and the accuracy of the basic coal quantity cannot be ensured. In order to solve the above problems, coal quality correction under coal type difference is realized by a coal calorific value correction technique (BTU). The specific implementation logic is as follows: the standard coal amount corresponding to the actual load is used as a set value of a heat value correction PID, the actual value is the current corrected fuel amount, the difference value obtained by subtracting the two is calculated by a pure integral (8000s) PID, the output value is a fuel heat value correction coefficient, the heat value correction coefficient is multiplied by the actual fuel amount to be used as the corrected fuel amount, and the corrected fuel amount is used as the actual value of the heat value correction PID again to carry out cyclic correction. And meanwhile, the corrected fuel quantity is used as the final actual fuel quantity to synchronously enter the closed-loop control of the fuel main control. For example, when the correction factor is 1.1, it indicates that the calorific value of the design coal is 1.1 times of the calorific value of the current fuel amount, and if the design coal needs 100t/h under the current load, the current calorific value of the fuel coal needs 100 × 1.1 to 110 t/h. Through such a conversion relation, the heat value correction of the fuel coal is completed.
And (3) a basic coal quantity function f (x) corresponding to the total load of the unit, wherein the function is a designed coal type coal quantity relational expression, and when the factors such as large change of coal types, characteristic change of auxiliary machines, overhaul of boilers and the like are generated, the f (x) functional relational expression is not accurate any more, and when the deviation of the coal quantity is large, the function of correcting the heat value of the fire coal is greatly disturbed.
The conventional coal-fired heat value correction (BTU) is to compare a designed coal amount corresponding to a unit load instruction with an actual coal amount, when the unit load, the pressure, the intermediate point temperature and the coal amount are stable, the coal amount needs to be slowly corrected through a pure integral pid of 6000s-8000s, when the coal amount changes, the main steam pressure of the unit changes after a period of pure lag time, the coal amount is adjusted again through the closed-loop action of the main control of a boiler to achieve the correction effect, and the unit coal amount, the main steam pressure and the main reheat steam temperature fluctuate greatly due to the over-quick correction time; when the correction action is set slowly, although the influence on each main parameter of the unit is weak, the correction function is weak, so that the coordination of the unit cannot adapt to the change of the coal type. At the present stage, along with the influence of higher AGC load change rate, larger amplitude and higher frequency, the time that the unit is in a stable working condition for a long time is shorter, along with the current situation of urgent demand of the thermal power unit on fuel, the coal type entering a plant cannot meet the requirement of designing the coal type, the change of the heat value of the fire coal is larger, the basic coal amount corresponding to the load in the coordinated control system is not an accurate numerical value, and the actual work-coal ratio is greatly different from the original design value. Therefore, the conventional coal-fired heat value correction (BTU) function cannot meet the coordinated control requirement of the unit at the present stage, the coal-fired heat value cannot be corrected in time, the abnormal over-regulation or under-regulation of the coal quantity when the unit is subjected to load variation can be caused, the unit is in an unstable working condition for a long time, the safety of the unit is influenced, and the economic operation of the unit is not facilitated. The invention aims to solve the problem of poor coordination control effect of the thermal power generating unit under the working conditions of frequent fuel variation and large heat value variation, and realizes the function of quickly correcting the coal quality of the coordination control system under zero disturbance.
Disclosure of Invention
The invention aims to provide a supercritical unit fuel calorific value correction control method based on dynamic work-coal ratio to solve the technical problems.
The invention provides a supercritical unit fuel calorific value correction control method based on dynamic work coal ratio, which comprises the following steps:
step 1, calculating a power-coal ratio loop by using a judging condition of steady-state operation of a unit to obtain a steady-state power-coal ratio coefficient of the unit, and calculating a basic coal amount of the unit under the current coal-fired heat value condition by multiplying the steady-state power-coal ratio coefficient by a current load instruction;
and 2, when the heat value of the coal fired by the unit changes, correcting and judging the dynamic work coal ratio of the unit through work coal ratio correction, latching the single correction coal amount, superposing the correction coal amount and performing boiler master control reverse compensation on the work coal ratio correction coal amount.
Further, the step 1 comprises:
and comparing the dynamic working coal ratio with the steady-state working coal ratio, and keeping the current steady-state working coal ratio value when the deviation is less than 0.1.
Further, the step 2 comprises:
during the working coal ratio correction triggering period, calculating the variable quantity of the current unit load static coal quantity instruction to obtain a single working coal ratio coal quantity correction value; after the correction is finished, keeping the absolute coal quantity difference value of the correction, and continuously superposing the original corrected coal quantity when the next coal power ratio correction is triggered; and when the time delay is 0.5s after the boiler master control is automatically cut off, clearing the latched coal amount.
Further, the step 2 further comprises:
and carrying out reverse compensation on the coal quantity absolute value corrected by the working coal ratio in the boiler main control coal quantity output, so that the boiler main control coal quantity output is not changed when the working coal ratio is corrected, and the working coal ratio correction under the unit coal quantity undisturbed state is realized.
By means of the scheme, the supercritical unit fuel heat value correction control method based on the dynamic work coal ratio calculates the unit work coal ratio parameter through the ratio of the unit load and the coal burning quantity which change in real time, the unit steady state work coal ratio coefficient is determined through judgment of unit steady state mode conditions, when the unit coal burning heat value changes, heat value correction can be accurately and rapidly carried out, the corrected difference quantity carries out reverse compensation on the boiler main control, the rapidity of correcting the work coal ratio coefficient is achieved, and the undisturbed performance of the work coal ratio coefficient correction process is guaranteed. Based on the function of replacing the f (x) function of the coal amount corresponding to the conventional load by the work coal ratio, the accuracy of the coal amount following the change can be ensured when the load changes, and meanwhile, the disturbance in the coal heat value correction process can also be avoided. The quality of adjustment of unit coordinated control is greatly improved, the fluctuation of coal quantity is smaller, and the main parameters of the units, such as the water supply flow rate of the units, the intermediate point temperature, the temperature of main and reheated steam, the nitrogen oxide concentration of an NOx outlet, the total air quantity, the primary air pressure, the total air quantity, the hearth pressure and the like, can keep better stability when the units dynamically coordinate to adjust load. The effect is particularly obvious for power plants with large change of the heat value of the fire coal and unstable coal types.
Drawings
FIG. 1 is a flow chart of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a work coal ratio calculation loop according to the present invention;
FIG. 3 is a schematic diagram of a main control reverse compensation calculation loop of a work coal ratio coal quantity correction boiler according to the present invention;
FIG. 4 is a schematic diagram of a main control coal quantity reverse compensation loop of a work coal ratio coal quantity correction boiler according to the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1, the embodiment provides a method for controlling the correction of the calorific value of the supercritical unit fuel based on the dynamic work-coal ratio, which includes:
step 1, calculating a power-coal ratio loop by using a judging condition of steady-state operation of a unit to obtain a steady-state power-coal ratio coefficient of the unit, and calculating a basic coal amount of the unit under the current coal-fired heat value condition by multiplying the steady-state power-coal ratio coefficient by a current load instruction;
and 2, when the heat value of the coal fired by the unit changes, correcting and judging the dynamic work coal ratio of the unit through work coal ratio correction, latching the single correction coal amount, superposing the correction coal amount and performing boiler master control reverse compensation on the work coal ratio correction coal amount.
According to the method, the steady-state work coal ratio is deduced through the dynamic work coal ratio and the unit steady-state judgment condition, the accurate coal quantity instruction under the current coal-fired heat value is obtained by multiplying the steady-state work coal ratio by the unit load instruction, the rough coal quantity instruction is obtained through single constant f (x) instead of the conventional unit load instruction, and compared with the traditional control method, the method is more scientific and reasonable, and the accurate coal quantity control can improve the unit coordination regulation quality. When the heat value of the fire coal changes, the work-coal ratio dynamic compensation function can correct the work-coal ratio in a zero disturbance mode, and the correction can be completed within 20s under the steady-state working condition of the unit. The conventional heat value correction function influences the main steam pressure of the unit through the coal quantity, and further influences the coal quantity change of the main control output of the boiler, so that the purpose of coal quality correction can be achieved, the coal quantity correction time can reach 2h or even longer time every time, the correction speed is low, and certain disturbance is achieved on boiler combustion and coal quantity adjustment. According to the invention, the coal quality correction is completed only by 3% of the correction time of the traditional control strategy, the correction process is completely undisturbed, the accurate matching degree of the unit fire coal and the unit load is greatly improved, the adjustment quality of the unit coordination control is improved, the unit overall load fluctuation coal quantity fluctuation is smaller, the main and reheating steam pressures and temperatures are more stable, and the unit economy is also improved.
The present invention is described in further detail below.
Referring to fig. 2, the working coal ratio operation loop uses the judgment condition of the steady-state operation of the unit to operate the working coal ratio loop to obtain an accurate and stable working coal ratio coefficient, and the product operation is performed with the current load instruction to obtain the base coal amount corresponding to the current load of the unit. The embodiment obtains the actual output level of the unit, namely the total load of the unit by using the actual load of the unit (the reason that the load instruction is not equal to the actual load after the primary frequency modulation action of the unit, and the actual load can accurately represent the actual output level of the unit) and adding the heat supply load (the heat supply load of the northern unit is corrected, and if the unit is not a heat supply unit, the heat supply load is not required to be added). And dividing the total fuel quantity by the total load (ten thousand units) of the unit to obtain the real-time dynamic work-coal ratio (the ton of the fuel quantity corresponding to ten thousand loads) of the unit. The dynamic working coal ratio is not necessarily an accurate working coal ratio value in a stable state of the unit, so that the calculation time of the working coal ratio is required to be limited. When the unit is in a coordination mode, the deviation of the main steam pressure of the unit is less than 0.2MPa, the 60s differential of the deviation of the main steam pressure is less than 0.1MPa, the unit is not in a variable load state, and when the conditions that the unit does not generate RB and the like are met, the dynamic work-coal ratio is converted into the steady-state work-coal ratio of the unit according to the change rate of 50 t/min. In order to avoid small amplitude fluctuation of the power-coal ratio in the steady state of the unit, the dynamic power-coal ratio and the steady-state power-coal ratio are compared, when the deviation is less than 0.1, the current steady-state power-coal ratio value is kept, and the steady-state power-coal ratio represents the accurate fuel demand of the current heat value of the fire coal with 10MW load increase and decrease. The steady-state work coal ratio value multiplied by the unit load instruction represents a basic coal quantity instruction corresponding to the current load of the unit. The reason why the basic coal amount instruction corresponding to the current load is obtained by using the method to replace the unit load instruction corresponding to f (x) is that the single constant f (x) function is not accurate enough at the moment due to the variability of coal types. The relationship of the working coal can be accurately determined by adopting the working coal ratio loop, so that the coal quantity change is more accurate when the unit is subjected to variable load, and the coal quantity adjustment amplitude and frequency of the boiler master control closed loop lag are reduced as much as possible.
Referring to fig. 3, the main control reverse compensation calculation loop of the work coal ratio coal quantity correction boiler is the key point of the undisturbed work coal ratio correction. And during the working coal ratio correction triggering period, calculating the variation of the current unit load static coal quantity instruction to obtain a single working coal ratio coal quantity correction value. After the correction is finished, the corrected absolute coal quantity difference value is kept, and when the next coal ratio correction is triggered, the original corrected coal quantity is continuously superposed. And when the time delay is 0.5s after the boiler master control is automatically cut off, clearing the latched coal amount. The superposition compensation calculation function of the compensation loop switches and latches the four T-shaped selected blocks through the judgment conditions of work coal ratio triggering and work coal ratio triggering disappearance, so as to achieve the function of superposition compensation.
Referring to fig. 4, the work coal ratio coal quantity correction boiler main control coal quantity reverse compensation loop is used for performing reverse compensation on the coal quantity absolute value corrected by the work coal ratio in the boiler main control coal quantity output, so that when the work coal ratio is corrected, the boiler main control coal quantity output is not changed, and the work coal ratio correction function under the unit coal quantity undisturbed state is realized.
The supercritical unit fuel heat value correction control method based on the dynamic work coal ratio obtains a unit steady-state work coal ratio coefficient by using a unit dynamic work coal ratio and a unit steady-state operation limiting condition, and obtains an accurate work coal ratio matching relation under the current coal heat value condition after multiplying the unit steady-state work coal ratio coefficient by a unit load instruction. The instantaneity and the non-disturbance of the unit dynamic work coal ratio correction process are realized through the functions of work coal ratio correction triggering judgment, single-time correction coal amount latching, correction coal amount superposition, boiler master control reverse compensation of work coal ratio correction coal amount and the like.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A supercritical unit fuel calorific value correction control method based on dynamic work coal ratio is characterized by comprising the following steps:
step 1, calculating a power-coal ratio loop by using a judging condition of steady-state operation of a unit to obtain a steady-state power-coal ratio coefficient of the unit, and calculating a basic coal amount of the unit under the current coal-fired heat value condition by multiplying the steady-state power-coal ratio coefficient by a current load instruction;
and 2, when the heat value of the coal fired by the unit changes, correcting and judging the dynamic work coal ratio of the unit through work coal ratio correction, latching the single correction coal amount, superposing the correction coal amount and performing boiler master control reverse compensation on the work coal ratio correction coal amount.
2. The dynamic work coal ratio-based supercritical unit fuel calorific value correction control method according to claim 1, wherein the step 1 comprises:
and comparing the dynamic working coal ratio with the steady-state working coal ratio, and keeping the current steady-state working coal ratio value when the deviation is less than 0.1.
3. The supercritical unit fuel calorific value correction control method based on dynamic work-coal ratio according to claim 1, wherein the step 2 comprises:
during the working coal ratio correction triggering period, calculating the variable quantity of the current unit load static coal quantity instruction to obtain a single working coal ratio coal quantity correction value; after the correction is finished, keeping the absolute coal quantity difference value of the correction, and continuously superposing the original corrected coal quantity when the next coal power ratio correction is triggered; and when the time delay is 0.5s after the boiler master control is automatically cut off, clearing the latched coal amount.
4. The dynamic work coal ratio-based supercritical unit fuel calorific value correction control method according to claim 3, wherein the step 2 further comprises:
and carrying out reverse compensation on the coal quantity absolute value corrected by the working coal ratio in the boiler main control coal quantity output, so that the boiler main control coal quantity output is not changed when the working coal ratio is corrected, and the working coal ratio correction under the unit coal quantity undisturbed state is realized.
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| CN113848716A (en) * | 2021-09-27 | 2021-12-28 | 大唐东北电力试验研究院有限公司 | Method for quickly correcting coal calorific value of thermal power plant |
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