CN101949536B - Balanced coal supply control device of large circulating fluidized bed boiler - Google Patents
Balanced coal supply control device of large circulating fluidized bed boiler Download PDFInfo
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Abstract
The invention discloses a balanced coal supply control device of a large circulating fluidized bed boiler. The balanced coal supply control device comprises a main coal supply regulation loop and a coal supplier multi-execution mechanism coordination loop, wherein the coal supplier multi-execution mechanism coordination loop comprises balanced coal supply regulation loops at the side A and the side B of the circulating fluidized bed boiler, and coal supply signals output by the main coal supply regulation loop are respectively sent to the balanced coal supply regulation loops at the side A and the side B. A total coal supply quantity setting control command of the main coal supply loop consists of the output of a boiler master, and a controlled quantity is the actual total coal supply quantity of all coal suppliers; after the total coal supply quantity setting control command and the controlled quantity are subjected to deviation calculation, the control quantity is worked out through PI or PID regulation operation; and the output is respectively sent to the balanced coal supply regulation loops comprising multiple coal suppliers at the side A and the side B to balancedly control the coal supply of the side A and the side B of the large circulating fluidized bed so as to guarantee that the bed temperature of the left side and the right side of a hearth uniformly changes. The invention meets the combustion control requirement on a hearth with a large width/depth ratio.
Description
Technical field
The present invention relates to a kind of balanced coal supply control device that is applicable to independent development large circulating fluidized bed boiler (CFB), to satisfy the hearth combustion control requirement of large breadth depth ratio.
Background technology
CFBB (CFB) is with its combustion system that cleans, the characteristics such as fuel tolerance is wide, load regulation rate is wide, obtained in recent years developing rapidly, subcritical large-scale (evaporation capacity 1025t/h) CFB of independent development puts into commercial operation, the CFB of China has entered the developing stage of Sub-critical Parameter, and the Large-scale CFB of independent development becomes one of preferred technology of thermal power plant.
The large circulating fluidized bed boiler of independent development, adopt single chamber structure of large breadth depth ratio, the multiple spot coal supply, so, balanced coal supply just seems extremely important for the normal operation of this class unit, and it should guarantee that fuel stablely burns fully, in time produces heat energy by the requirement of electrical network; Guarantee that again the left and right sides coal supply is balanced, keep burner hearth bed temperature even variation everywhere, hot-spot does not cause coking.Control strategy in the past is difficult to satisfy these requirements.
CFB is special owing to combustion process, so that be difficult to satisfy the burning control of CFBB in the effective conventional control method of pulverized-coal fired boiler, so need the characteristic for the CFB boiler, the method for controlling combustion of exploitation uniqueness; Imported CFB adopts the bilateral chamber structure of minute vent in the sides of a garment, is connected to respectively 2 to seam, after the normal operation of boiler, by adjusting 2 to the coal amount of seam, just can keep left and right sides coal-supplying amount balance.And the large circulating fluidized bed boiler of independent development, adopt single chamber structure of large breadth depth ratio, the multiple spot coal supply, it has very large difference with the CFB that introduces at aspects such as boiler process structure, control modes, and the effective coal supply control program of Imported CFB can not satisfy the regulation and control requirement of independent development type CFB.Therefore, domestic CFB unit is not all realized the equilibrium control of both sides coal supply always well for a long time.
Summary of the invention
The control device that the purpose of this invention is to provide the balanced coal supply in a kind of large circulating fluidized bed boiler left and right sides can satisfy the hearth combustion control requirement of large breadth depth ratio.
For achieving the above object, the balanced coal supply control device of large circulating fluidized bed boiler of the present invention, comprise the many executing agencies of coal supply main regulation loop and feeder coordination loop, the many executing agencies of described feeder coordinate the loop and comprise CFBB A, the balanced coal supply regulating loop in B both sides, A, B both sides namely represent the left and right sides, and the coal supply command signal of described coal supply main regulation loop output is delivered to respectively A, the balanced coal supply regulating loop in B both sides;
Described coal supply main regulation loop comprises the first digital filter computing module, the second digital filter computing module, deviation alarm module, coal supply master control adjustment control and A, B both sides coal supply mean value computation device, and described coal supply master control adjustment control comprises deviation unit, PI or PID computing regulon, manual/auto switch unit, the tracking cell that links to each other successively;
The total Limestone control instruction of setting of described the first digital filter computing module access boiler master, the second digital filter computing module is accepted total coal-supplying amount signal that the actual coal-supplying amount of whole feeders comprehensively forms, these two filtering operation modules are carried out after first-order filtering processes setting total Limestone control instruction and actual total coal-supplying amount signal, form signal stably and deliver to the deviation unit of deviation alarm module and coal supply master control adjustment control, A, B both sides coal supply mean value computation device 106 input A, the A of the balanced coal supply regulating loop output in B both sides, the total coal-supplying amount signal in B both sides, export the tracking cell of coal supply master control adjustment control to, the coal supply command signal of described coal supply main regulation loop output is the coal supply command signal of coal supply master control adjustment control output.
In one embodiment, above-mentioned A, the balanced coal supply regulating loop in B both sides, the balanced coal supply regulating loop of each side all contains: the balanced coal supply adjustment control of homonymy, balanced coal supply hand/adaptive switched module, first, second ... N coal supply tractor driver/adaptive switched module, adder Module, described balanced coal supply adjustment control comprises the deviation unit that links to each other successively, PI or PID computing regulon, described balanced coal supply hand/adaptive switched module comprises manual/auto switch unit, described first, second ... N coal supply tractor driver/adaptive switched module, coal supply tractor driver/adaptive switched module all comprises manual/auto switch unit separately;
In the balanced coal supply regulating loop of each side, the coal supply command signal of coal supply master control adjustment control output is successively after balanced coal supply adjustment control, balanced coal supply hand/adaptive switched module, transport to respectively each coal supply tractor driver of this side/adaptive switched module, output order changes the feeder rotating speed afterwards, satisfies the control requirement of balanced coal supply; The output of each coal supply tractor driver/adaptive switched module also is connected to simultaneously adder and asks the power addition, and this adder is the summation of this side coal-supplying amount signal, i.e. the balanced coal supply adjustment control of the total coal-supplying amount signal back of this side;
The total coal-supplying amount signal in A, B both sides of above-mentioned A, B both sides coal supply mean value computation device input A, the balanced coal supply regulating loop output in B both sides is total coal-supplying amount signal of input A, the output of B both sides adder.
In a kind of preferential embodiment, above-mentioned balanced coal supply hand/adaptive switched module also comprises the deviator unit, is connected between its input and the manual/auto switch unit.Also export both sides tuningout instruction on the balanced coal supply hand of above-mentioned A side/adaptive switched module, the adder that is located at the balanced coal supply regulating loop of B side entrance and the subtracter of the balanced coal supply regulating loop of A side entrance are received in its output.By revising the both sides tuningout instruction bias of the balanced coal supply hand of A side/adaptive switched module, adjust the input of the balanced coal supply regulating loop in both sides, a side strengthens, and opposite side equivalent reduces, and can reach artificial leveling.
The present invention is by arranging coal supply master control adjustment control, in case all actual total coal-supplying amount signal of feeder changes, coal supply master control adjustment control will send correction instruction, and actual total coal-supplying amount of whole feeders is maintained on total coal-supplying amount of setting at once; By balanced coal supply adjustment control is set, in case an a certain side feeder is exerted oneself and is reduced, namely the rotating speed of this feeder reduces, corresponding coal-supplying amount reduces, then the balanced coal supply adjustment control of this side just sends correction signal, increases immediately exerting oneself of other feeder of homonymy, and it is stable to keep this side coal-supplying amount at once, and exerting oneself of the feeder of maintenance opposite side is substantially constant, makes the rapid leveling of both sides coal-supplying amount; Otherwise, reduce immediately exerting oneself of other feeder of homonymy, keep the total coal-supplying amount of this side constant, like this, can control evenly the variation of large-size circulating fluidized bed left and right sides coal-supplying amount.
As seen, the present invention is by coordinating the coal-supplying amount of many feeders of controlled circulation fluidized-bed combustion boiler, specifically, the rotating speed by many feeders in the appropriate change CFBB left and right sides reaches both sides coal-supplying amount changes in balance, has satisfied the hearth combustion control requirement of large breadth depth ratio.
Description of drawings
Describe the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is embodiment of the invention theory of constitution figure;
Fig. 2 is the coal supply main regulation loop enlarged drawing of Fig. 1;
Fig. 3 is the balanced coal supply regulating loop of the A side enlarged drawing of Fig. 1.
The specific embodiment
The large circulating fluidized bed boiler of independent development adopts single chamber structure of large breadth depth ratio, disposes many feeders, carries out the multiple spot coal supply, and be arranged in tens bed temperature measuring points is arranged on the air distribution plate.
The balanced coal supply control device of most preferred embodiment of the present invention large circulating fluidized bed boiler as shown in Figure 1 to Figure 3, comprise the many executing agencies of coal supply main regulation loop 1 and feeder coordination loop 2, the many executing agencies of feeder coordinate loop 2 and comprise CFBB A, the balanced coal supply regulating loop 200,210 in B both sides, CFBB A, B both sides represent the CFBB left and right sides, and the coal supply command signal of coal supply main regulation loop 1 output is delivered to respectively A, the balanced coal supply regulating loop 200,210 in B both sides.
Coal supply main regulation loop 1: comprise the first digital filter computing module 101, the second digital filter computing module 102, deviation alarm module 103, coal supply instruction correcting module 104, hand/from signal handover module 107, coal supply master control adjustment control 105 and A, B both sides coal supply mean value computation device 106; Coal supply master control adjustment control 105 comprises deviation unit, PI computing regulon, manual/auto switch unit, tracking cell, upper amplitude limit unit and the lower amplitude limit unit that links to each other successively.
The total coal supply control instruction of the setting FD of the first digital filter computing module 101 access boiler masters, the second digital filter computing module 102 is accepted total coal-supplying amount signal FF that the actual coal-supplying amount of whole feeders comprehensively forms, two filtering operation modules are carried out after first-order filtering processes setting total coal supply control instruction and total coal-supplying amount signal, form stably signal and deliver to subordinate's computing module and process.
Coal supply instruction correcting module 104 receives 101 outputs of the first digital filter computing module and sets stably total coal supply control instruction, add the coal supply instruction revision directive of artificial adjustment, its output forms the final total coal supply control instruction of setting to hand/from signal handover module 107, when switching manual state, its output is given by manually arranging, when switching auto state, it is output as the total coal supply control instruction of final setting of coal supply instruction correcting module 104 outputs.
Coal supply master control PI adjustment control 105 input hands/from actual total coal-supplying amount signal of the smooth change of the total coal supply control instruction of final setting of signal handover module 107 outputs and 102 outputs of the second digital filter computing module, its deviate is carried out PI regulate computing, when being in manual state, its output is by manual operation, when being in auto state, the output valve process of adjusting computing is the amplitude limit module up and down, and loop 2 is coordinated by output coal supply command signal to the many executing agencies of feeder.
A, B both sides coal supply mean value computation device 106 input A, the total coal-supplying amount signal in B both sides, they are averaged, the tracking cell of coal supply master control PI adjustment control 105 is delivered in then output, so that the average coal-supplying amount of the output tracking A of coal supply master control adjustment control 105, B both sides.
Loop 2 is coordinated by the many executing agencies of feeder: be divided into fluid bed A, the balanced coal supply regulating loop 200,210 in B both sides, the coal supply command signal of coal supply master control PI adjustment control 105 outputs is delivered to respectively A, the balanced coal supply regulating loop 200,210 in B both sides, the balanced coal supply regulating loop of each side all contains: the balanced coal supply adjustment control 202 of homonymy, balanced coal supply hand/adaptive switched module 203, first, second, third, fourth coal supply tractor driver/adaptive switched module 204,205,206,, 207, adder Module 208; Balanced coal supply adjustment control 202 comprises deviation unit, PI computing regulon, upper amplitude limit unit and the lower amplitude limit unit that links to each other successively, balanced coal supply hand/adaptive switched module 203 comprises the deviator unit that links to each other successively, manual/auto switch unit, amplitude limit unit up and down, first, second, third, fourth coal supply tractor driver/adaptive switched module 204,205,206,207, coal supply tractor driver/adaptive switched module all comprises successively the deviator unit that links to each other, manual/auto switch unit, amplitude limit unit up and down separately.
In the balanced coal supply regulating loop 200 of each side or 210, the coal supply command signal of coal supply master control PI adjustment control 105 output is transported to respectively again each coal supply tractor driver of this side/adaptive switched module 204,205,206,207 successively after balanced coal supply PI adjustment control 202, balanced coal supply hand/adaptive switched module 203, afterwards, output changes each feeder A1, A2, A3, A4 rotating speed, satisfies the control requirement of balanced coal supply.
Each coal supply tractor driver/adaptive switched module 204,205,206,207 also exports simultaneously adder 208 to and asks the power addition, obtain the total coal-supplying amount signal of this side after, feed back to balanced coal supply PI adjustment control 202.
Output both sides tuningout instruction on the balanced coal supply hand of the balanced coal supply regulating loop 200 of A side/adaptive switched module 203, the adder 211 that is located at the balanced coal supply regulating loop of B side 210 entrances and the subtracter 201 of the balanced coal supply regulating loop of A side 200 entrances are received in its output, by revising the bias of the balanced coal supply hand of A side/adaptive switched module 203, adjust the input of the balanced coal supply regulating loop in both sides, one side strengthens, opposite side equivalent reduces, and can reach artificial leveling.
Each coal supply tractor driver of balanced coal supply regulating loop/adaptive switched module separately, the biasing of exerting oneself by its deviator unit of artificial adjustment, can be on the balanced coal supply instruction basis of balanced coal supply hand/adaptive switched module output, suitably increase as required/reduce exerting oneself of this feeder, to revise the different output characteristics of each feeder, to adjust the coal supply of each time coal point to realize bed temperature leveling everywhere.
Claims (10)
1. the balanced coal supply control device of large circulating fluidized bed boiler, it is characterized in that: comprise the many executing agencies of coal supply main regulation loop (1) and feeder coordination loop (2), the many executing agencies of described feeder coordinate loop (2) and comprise CFBB A, the balanced coal supply regulating loop (200,210) in B both sides, and the coal supply command signal of described coal supply main regulation loop (1) output is delivered to respectively A, the balanced coal supply regulating loop (200,210) in B both sides;
Described coal supply main regulation loop (1) comprises the first digital filter computing module (101), the second digital filter computing module (102), deviation alarm module (103), coal supply master control adjustment control (105) and A, B both sides coal supply mean value computation devices (106), and described coal supply master control adjustment control (105) comprises deviation unit, PI or PID computing regulon, manual/auto switch unit, the tracking cell that links to each other successively;
The total Limestone control instruction of setting (FD) of described the first digital filter computing module (101) access boiler master, the second digital filter computing module (102) is accepted total coal-supplying amount signal (FF) that the actual coal-supplying amount of whole feeders comprehensively forms, these two filtering operation modules are carried out after first-order filtering processes setting total Limestone control instruction and actual total coal-supplying amount signal, form signal stably and deliver to the deviation unit of deviation alarm module (103) and coal supply master control adjustment control (105), A, B both sides coal supply mean value computation devices (106) input A, the balanced coal supply regulating loop (200 in B both sides, 210) A of output, the total coal-supplying amount signal in B both sides, export the tracking cell of coal supply master control adjustment control (105) to, the coal supply command signal of described coal supply main regulation loop (1) output is the coal supply command signal of coal supply master control adjustment control (105) output.
2. control device according to claim 1, it is characterized in that: described coal supply main regulation loop (1) also comprises coal supply instruction correcting module (104), the total Limestone control instruction of setting of boiler master behind the first digital filter computing module (101), coal supply instruction correcting module (104), is distinguished the deviation unit of input deviation alarm module (103) and coal supply master control adjustment control (105) successively.
3. control device according to claim 2, it is characterized in that: described coal supply main regulation loop (1) also comprises hand/from signal handover module (107), the total Limestone control instruction of setting of boiler master is successively through the first digital filter computing module (101), coal supply instruction correcting module (104), hand/behind signal handover module (107), distinguish the deviation unit of input deviation alarm module (103) and coal supply master control adjustment control (105).
4. control device according to claim 1, it is characterized in that: described coal supply main regulation loop (1) also comprises hand/from signal handover module (107), the total Limestone control instruction of setting of boiler master is successively through the first digital filter computing module (101), hand/behind signal handover module (107), distinguish the deviation unit of input deviation alarm module (103) and coal supply master control adjustment control (105).
5. according to claim 1 to 4 each described control device, it is characterized in that: described A, the balanced coal supply regulating loop (200 in B both sides, 210), the balanced coal supply regulating loop of each side all contains: the balanced coal supply adjustment control (202) of homonymy, balanced coal supply hand/adaptive switched module (203), first, second ... N coal supply tractor driver/adaptive switched module (204,205,206,207), adder (208), described balanced coal supply adjustment control (202) comprises the deviation unit that links to each other successively, PI or PID computing regulon, described balanced coal supply hand/adaptive switched module (203) comprises manual/auto switch unit, described first, second ... N coal supply tractor driver/adaptive switched module (204,205,206,207) all comprise separately manual/auto switch unit;
In the balanced coal supply regulating loop (200,210) of each side, the coal supply command signal of coal supply master control adjustment control (105) output is successively after balanced coal supply adjustment control (202), balanced coal supply hand/adaptive switched module (203), transport to respectively each coal supply tractor driver of this side/adaptive switched module (204,205,206,207), output order changes the feeder rotating speed afterwards; The output of each coal supply tractor driver/adaptive switched module also is connected to adder (208) simultaneously, and this adder (208) is with the balanced coal supply adjustment control (202) of the total coal-supplying amount signal back of this side;
The total coal-supplying amount signal in A, B both sides of described A, B both sides coal supply mean value computation devices (106) input A, the balanced coal supply regulating loops in B both sides (200,210) output is total coal-supplying amount signal of A, B both sides adders (208) output.
6. control device according to claim 5, it is characterized in that: described balanced coal supply hand/adaptive switched module (203) also comprises the deviator unit, is connected between its input and the manual/auto switch unit.
7. control device according to claim 6, it is characterized in that: also export both sides tuningout instruction on the balanced coal supply hand of described A side/adaptive switched module (203), the adder (211) that is located at balanced coal supply regulating loop (210) entrance of B side and the subtracter (201) of balanced coal supply regulating loop (200) entrance of A side are received in its output.
8. control device according to claim 7, it is characterized in that: described first, second ... N coal supply tractor driver/adaptive switched module (204,205,206,207) all also comprises the deviator unit separately, is connected between its input and the manual/auto switch unit.
9. control device according to claim 6, it is characterized in that: described first, second ... N coal supply tractor driver/adaptive switched module (204,205,206,207) all also comprises the deviator unit separately, is connected between its input and the manual/auto switch unit.
10. control device according to claim 5, it is characterized in that: described first, second ... N coal supply tractor driver/adaptive switched module (204,205,206,207) all also comprises the deviator unit separately, is connected between its input and the manual/auto switch unit.
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| CN107327865A (en) * | 2016-04-28 | 2017-11-07 | 邸生才 | It is windy to send pipeline powder coal weight or heat balance to supply powder control system and control method |
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