CN101482449B - Risk limitation method for fast runback test of thermoelectric generating set - Google Patents
Risk limitation method for fast runback test of thermoelectric generating set Download PDFInfo
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- CN101482449B CN101482449B CN200810059223XA CN200810059223A CN101482449B CN 101482449 B CN101482449 B CN 101482449B CN 200810059223X A CN200810059223X A CN 200810059223XA CN 200810059223 A CN200810059223 A CN 200810059223A CN 101482449 B CN101482449 B CN 101482449B
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Abstract
The invention relates to a risk limiting method in rapid load reducing test for thermoelectric generating set, belonging to the thermoelectric generating set rapid load reducing test field. The prior arts have the defects of large risk and easy trip of the set main fuel caused by improper operation in test. The method of the invention comprises the following steps: performing one mill trip fuel RB test; performing two mills trip fuel RB test; performing one blowing/induced draught fan trip RB test; performing one primary air fan trip RB test; and performing one heat pump trip RB test while the charge pump is not started. By arranging reasonable test sequence and confirmed content, the invention effectively reduces test risk, and furthest avoids the generation of set MFT caused by unsuccessful test.
Description
[technical field]
The present invention relates to quick Reduction of Students' Study Load (RUNBACK is called for short RB) the test field of thermal power generation unit, specifically is the method that a kind of risk that will test reduces.
[background technology]
The single-machine capacity of thermal power generation unit is increasing, automaticity is more and more higher, when fired power generating unit is moved under coordinated control mode, when major pant item equipment failure tripping operation takes place, as can not correctly realizing effective RB, to cause unit tripping, electrical network will be produced bigger impact, also influence the economic benefit of unit.Therefore, newly-built unit all needs to carry out the RB test before formal the use, and this test findings also is the important judging basis of debugging quality.
RB test is a kind of high risk test, especially between the limber up period of newly-built unit, is easy to cause because test is improper and can causes serious consequence by unit main fuel trip (MFT).
[summary of the invention]
In order to overcome the above-mentioned defective that exists in the prior art, the invention provides a kind of risk limitation method for fast runback test of thermoelectric generating set, to reduce empirical risk, effectively avoid causing the generation of unit MFT because of unsuccessful test.
For this reason, the present invention is by the following technical solutions: risk limitation method for fast runback test of thermoelectric generating set is characterized in that it comprises the following step of carrying out successively:
1) carries out mill tripping operation fuel RB test;
2) carry out two mill tripping operation fuel RB test;
3) carry out one to send/fan trip RB test;
4) carry out primary air fan tripping operation RB test;
5) under the situation that electric pump does not start, carry out heat pump tripping operation RB test.
The risk of each step pilot project successively from low to high, and all can be follow-up test in the process of the test of preceding test and test findings foundation and help are provided, through in the adjustment of preceding test and perfect, can reduce the risk of big risk test of later stage to greatest extent, effectively avoid causing the generation of unit MFT because of unsuccessful test.Wherein in third step, the tripping operation RB of pressure fan and induced draft fan test all carries out being the best, under equipment deficiency or conditional situation, can consider to select one and carry out or the homonymy machine replaces mutually.
As the further of technique scheme improved and replenish, the present invention takes following technical measures: after a mill tripping operation fuel RB tests, carry out height and add whole group tripping operation RB test; After carrying out two mill tripping operation fuel RB test, carry out boiler water circulating pump tripping operation RB test; Carrying out one and giving/fan trip RB test after, under the situation of electric pump self-starting, carry out earlier heat pump tripping operation RB test, under the situation that electric pump does not start, carry out heat pump tripping operation RB test again; Carrying out one and giving/fan trip RB test or primary air fan tripping operation RB test after, carry out air preheater tripping operation RB test.These four tests are not to do project, can select as required and do, and do these several tests and help to adjust and improve equipment better, and further reduce the risk of follow-up test.
Wherein, during a mill tripping operation fuel RB test, the affirmation of carry out that RB triggers, the TF control mode is switched, boiler instruction switchings, RB rate setting, sliding pressure control mode, RB involution function, vapour pressure/steam temperature/negative pressure/regulating water level stability and adaptability for working condition, feeder instructing the upper limit, special concern mode switch that the incorrect CCS of causing withdraws from, coal pulverizer overcurrent or stifled powder and vapour pressure cyclic swing; When two mill tripping operation fuel RB tests, carry out rate of pressure reduction control, cut influence, boiler combustion stability, the controllability of water level/negative pressure/vapour pressure/steam temperature and the affirmation of departure degree of mill mode to steam temperature, the situation of special concern negative pressure quick oscillation, unstable combustion; Give at one/when fan trip RB tests, send/the induced draft fan interlock logic, jump the mill steering logic, automatically throw the oil reservoir logic, give/induced draft fan the instruction upper limit, air and flue system balance adjustment ability, send/the induced draft fan electric current, the affirmation of coal pulverizer outlet isolating door, pay special attention to burning control, blower fan excess current, burner hearth continuous positive pressure and primary air fan surge under the running on the lower load; When a primary air fan tripping operation RB test, carry out pulverized coal preparation system air door closing property, jump that mill is set interval time, the affirmation of blast regulating power, primary air fan electric current, feedwater balance of steam relation, pay special attention to prevent low, the blower fan excess current of blast one time; When a heat pump tripping operation RB under not startup of electric pump situation tests, carry out the saturated affirmation of the water level control anti-integration of inner looping, note water level control.
When height adds whole group tripping operation RB test, the affirmation of the whether out-of-limit and steam temperature variation tendency of steam turbine main body protection parameter be carried out, the situation of axial displacement, vibration, overtemperature be paid special attention to.
During a boiler water circulating pump tripping operation RB test, carry out the affirmation of regulating water level ability, stove water pump differential pressure, RB triggering logic, the water level control when noting recovering boiler water circulating pump.
When heat pump tripping operation RB test of the situation of electric pump self-starting, carry out electric pump and trigger the affirmation of logical time delay time set from opening control, big disturbance lower different type feed pump paired running and regulating power, RB, pay special attention to that electric pump is regulated and water level is controlled.
During an air preheater tripping operation RB test, carry out the affirmation of air preheater system wind and smoke flapper closure characteristic, note the primary air fan surge.
When carrying out above-mentioned test, earlier at 80%P
eCarry out the preparation property test under the following load condition, again at 90%P
eThe property examined test under the above load condition; When carrying out heat pump tripping operation RB test, under raising steam water-level definite value operating mode, carry out the test of heat pump tripping operation RB preparation property earlier, under normal steam water-level definite value operating mode, carry out heat pump tripping operation RB again and examine the property test.In preparation property test as go wrong little because power condition changing is little to the impact of unit, often can be by the operations staff in time remedy the generation of avoiding unit MFT.
Beneficial effect: the present invention has reduced empirical risk effectively by rational test sequence being set and confirming content, avoids causing because of unsuccessful test the generation of unit MFT most possibly.
[description of drawings]
Fig. 1 is a fundamental test order block diagram of the present invention.
Fig. 2 is a best test sequence block diagram of the present invention.
Fig. 3 is invention steam flow and the preceding drum vacancy water yield synoptic diagram of feedwater flow balance.
[embodiment]
Basic order risk limitation method for fast runback test of thermoelectric generating set as shown in Figure 1, carry out mill tripping operation fuel RB test successively, two mill tripping operation fuel RB test, pressure fan or fan trip RB test, primary air fan tripping operation RB test does not start the heat pump tripping operation RB test of situation at electric pump.
Figure 2 shows that a kind of preferable mode, promptly on the basis of basic order, increase some other project, comprising: after mill tripping operation fuel RB test, carry out height and add whole group tripping operation RB test; After carrying out two mill tripping operation fuel RB test, carry out boiler water circulating pump tripping operation RB test; Carry out one to give/fan trip RB test or primary air fan tripping operation RB test after, carry out air preheater tripping operation RB test; Carry out one to give/fan trip RB test after, under the situation of electric pump self-starting, carry out earlier heat pump tripping operation RB test, under the situation that electric pump does not start, carry out heat pump tripping operation RB test again.
Each step pilot project is described as follows:
1) a mill tripping operation fuel RB empirical risk is minimum, should carry out at first.By test, confirm the most basic function of RB control loop, the correctness of basic function passages such as checking " RB triggering ", " coordinated control mode switching ", " set speed and subtract fuel ", " sliding pressure control mode ", " RB involution ", the adjusting stability and the adaptability for working condition of important parameters such as vapour pressure, steam temperature, negative pressure, water level, and whether the maximum output limit value of feeder is suitable.
2) two mill tripping operation fuel RB test will be verified the influence degree of 2 coal pulverizer tripping operations to boiler combustion stability, and the controllability and the departure degree of water level, negative pressure, vapour pressure, steam temperature parameter, for later subsidiary engine RB (excising 2 coal pulverizers) provide with reference to and optimize foundation.
3) to add the control strategy of whole group tripping operation RB test be by triggering the function that fuel RB realizes load shedding to height, and the RB passage is identical, but does not excise coal pulverizer.To notice in the test that height adds the influence of off-the-line afterload upper punch to steam turbine main body protection parameter, and the variation tendency of steam temperature.
4) " RB triggerings ", " jumping the mill interlocking automatically ", " hauling oneself willingly into combustion-supporting equipment ", " the jumping the mill order " of subsidiary engine tripping operation and the correctness of function passages such as " selections at interval " will be further verified in fan trip RB test, and the departure degree of boiler combustion stability and important parameter.Need confirm and adjustment is sent, the induced draft fan instruction upper limit, prevent continuous positive pressure and blower fan supercurrent.Whether the affirmation coal pulverizer exports isolating door and closes automatically under the intertripping mode, isolate wind passage of tripping operation coal pulverizer during for primary air fan RB fast and do the inspection preparation.
5) pressure fan tripping operation RB test is test of the same type with a fan trip RB test, all can be used as the preparation property test of follow-up test, checks with the content of confirming basic identical.
6) boiler water circulating pump tripping operation RB test needs affirmation stove water pump differential pressure to hang down and the common RB triggering logic of judging of stove water pump trip signal.
7) a primary air fan tripping operation RB tests and will further verify at high load shedding speed and the short stability of boiler combustion under the mill interval and the controllability and the departure degree of important parameter of jumping.Need to confirm and the adjustment primary air fan instruction upper limit, prevent the blower fan supercurrent.Because it is less than normal that primary air fan is generally exerted oneself, and part of generating units design has " one time the low coal pulverizer of blast is jumped entirely " logic, so empirical risk is higher.
8) air preheater tripping operation RB test can be equivalent to substantially and send/induced draft fan RB test, but needs the risk of reply primary air fan surge; If connection is jumped the homonymy primary air fan, the then final RB process that realizes will be similar to primary air fan RB because primary air fan tripping operation RB on speed and target load all than sending/induced draft fan RB harshness.
9) heat pump tripping operation RB (electric pump self-starting) RB test logic is realized very complexity, and the automatic interlock of confirming electric pump is the difficult point of test.In case but behind the RB correct operation, but very little to the disturbance of unit operation.Owing to heat pump RB trigger port is verified, therefore also be can be used as the preparation property test of a heat pump tripping operation RB (electric pump does not start).
10) heat pump tripping operation RB (electric pump does not start) test is the maximum relatively RB test of risk, but because the adjustment by a series of RB tests in early stage and perfect, has reduced the risk of this test to greatest extent.Test still need further reduce risk by measures such as initial water level equivalence migration, not water outlet of electric pump spinning reserves, and by the overshoot behind the test affirmation rising of groundwater level and the ability of fast quick-recovery normal regulating.
Because steering logic fails to realize the expectant control scheme, causes test failure often, can carry out the preparation property test earlier.In preparation property test as the problems referred to above occur little because power condition changing is little to the impact of unit, often can be by the operations staff in time remedy the generation of avoiding unit MFT.Carry out three main points of preparation property test:
1) earlier at 80%P
eCarry out the preparation property test under the following load condition, then at 90%P
eThe property examined test under the above load condition.
2) earlier improve the steam water-level definite value (+50mm or+100mm) carry out the test of heat pump tripping operation RB preparation property under the operating mode, under normal steam water-level definite value (0mm) operating mode, carrying out the test of heat pump tripping operation RB examination property then.
3) the preparation property test that can be used as follow-up test is tested in the test sequence arrangement the preceding, and its process of the test and test findings can be for the correctness of the common sparing logical channel of affirmation follow-up test, and provides foundation for the optimization of test routine.
In experimentation, according to circumstances can adopt the equivalence principle, part RB test findings can be carried out equivalence evaluation or alternative fully, therefore can reduce test number (TN).Under the defective situation of unit equipment, utilize the equivalence principle can finish the test affirmation work of RB function equally.
The equivalence basic norm of RB test is described below:
1) the subsidiary engine tripping operation RB test carried out respectively of the both sides of similar subsidiary engine equipment under test subsidiary engine equipment is exerted oneself the prerequisite of basically identical, has equivalence completely.But the selected equipment state is stable and the less side apparatus of exerting oneself carries out the RB test as retaining device, the applicability of checking target load, and reduce empirical risk.
2) unit of jumping for air and flue system homonymy equipment requirements connection, there are local equivalence in pressure fan, induced draft fan RB.Mainly influence at the adjusting of change procedure, load and the vapour pressure of variation amplitude, feedwater and the steam water-level of combustion chamber draft and change procedure etc. and have equivalence completely aspect the factor of unit safety, under the situation of equipment deficiency or condition restriction, can consider the phase trans-substitution.
3) the general connection of air preheater tripping operation jump that homonymy gives, induced draft fan or primary air fan, equipment RB process has local equivalence to its RB process with wherein changing faster.Mainly influence at the adjusting of change procedure, load and the vapour pressure of variation amplitude, feedwater and the steam water-level of a combustion chamber draft or a blast and change procedure etc. and have equivalence completely aspect the factor of unit safety, under the situation of equipment deficiency or condition restriction, can consider the phase trans-substitution.
4) by revising more accurately and the water level migration of drum volume, there are equivalence completely in the initial set value of raising steam water-level before the feed pump RB and the zero first test findings under the water level operating mode.Can judge by the lowest water level value after the migration whether test is successful, also can draw RB by test result analysis can successful minimum steam water-level initial value.
5) because RB speed is identical at interval with the jumping mill, process running parameter basically identical, after finishing primary air fan tripping operation RB test, can be by a primary air fan tripping operation RB trial curve to a heat pump tripping operation RB (electric pump does not start) test carrying out initial estimate.In a primary air fan tripping operation RB trial curve, carry out (Fig. 3), after RB triggers, load is decreased to the water yield (shown in dash area among Fig. 3) of the interior institute of the preceding drum of the equilibrium point vacancy of steam flow and the maximum feedwater flow of single feed pump, conversion by the drum sectional dimension, can roughly estimate steam water-level possibility decline scope, prejudge the success ratio of feed pump RB test.
Claims (11)
1. risk limitation method for fast runback test of thermoelectric generating set is characterized in that it comprises the following step of carrying out successively:
1) carry out mill tripping operation fuel RB test;
2) carry out two mill tripping operation fuel RB test;
3) carry out one to send/fan trip RB test;
4) carry out primary air fan tripping operation RB test;
5) under the situation that electric pump does not start, carry out heat pump tripping operation RB test;
The affirmation of during a mill tripping operation fuel RB test, carry out that RB triggers, the TF control mode is switched, boiler instruction switchings, RB rate setting, sliding pressure control mode, RB involution function, vapour pressure/steam temperature/negative pressure/regulating water level stability and adaptability for working condition, feeder instructing the upper limit; When two mill tripping operation fuel RB tests, carry out rate of pressure reduction control, cut of influence, boiler combustion stability, the controllability of water level/negative pressure/vapour pressure/steam temperature and the affirmation of departure degree of mill mode steam temperature; Send at one/fan trip RB when test, send/the induced draft fan interlock logic, jump the mill steering logic, automatically throw the oil reservoir logic, give/induced draft fan the instruction upper limit, air and flue system balance adjustment ability, send/the induced draft fan electric current, affirmation that coal pulverizer exports isolating door; When primary air fan tripping operation RB test, carry out pulverized coal preparation system air door closing property, jump that mill is set interval time, the affirmation of blast regulating power, primary air fan electric current, feedwater balance of steam relation; When a heat pump tripping operation RB under not startup of electric pump situation tests, carry out the saturated affirmation of the water level control anti-integration of inner looping.
2. risk limitation method for fast runback test of thermoelectric generating set according to claim 1 is characterized in that carrying out height and adding whole group tripping operation RB test after mill tripping operation fuel RB test.
3. risk limitation method for fast runback test of thermoelectric generating set according to claim 1 is characterized in that carrying out boiler water circulating pump tripping operation RB test after carrying out two mill tripping operation fuel RB test.
4. risk limitation method for fast runback test of thermoelectric generating set according to claim 1, it is characterized in that carrying out one to give/fan trip RB test after, under the situation of electric pump self-starting, carry out earlier heat pump tripping operation RB test, under the situation that electric pump does not start, carry out heat pump tripping operation RB test again.
5. risk limitation method for fast runback test of thermoelectric generating set according to claim 1, it is characterized in that carrying out one and giving/fan trip RB test or primary air fan tripping operation RB test after, carry out air preheater tripping operation RB test.
6. whether out-of-limit risk limitation method for fast runback test of thermoelectric generating set according to claim 2 when it is characterized in that height adds whole group tripping operation RB test, carry out the affirmation of steam turbine main body protection parameter and steam temperature variation tendency.
7. risk limitation method for fast runback test of thermoelectric generating set according to claim 3 when it is characterized in that a boiler water circulating pump tripping operation RB test, carry out the affirmation of regulating water level ability, stove water pump differential pressure, RB triggering logic.
8. risk limitation method for fast runback test of thermoelectric generating set according to claim 4, it is characterized in that when heat pump tripping operation RB test of the situation of electric pump self-starting, will carrying out electric pump from the affirmation of opening control, big disturbance lower different type feed pump paired running and regulating power, RB triggering logical time delay time set.
9. risk limitation method for fast runback test of thermoelectric generating set according to claim 5 when it is characterized in that an air preheater tripping operation RB test, carry out the affirmation of air preheater system wind and smoke flapper closure characteristic.
10. according to each described risk limitation method for fast runback test of thermoelectric generating set of claim 7-9, it is characterized in that when carrying out above-mentioned test, under the following load condition of 80%Pe, carry out earlier the preparation property test, the property examined test under the above load condition of 90%Pe again.
11. according to each described risk limitation method for fast runback test of thermoelectric generating set of claim 7-9, when it is characterized in that carrying out heat pump tripping operation RB test, under raising steam water-level definite value operating mode, carry out the test of heat pump tripping operation RB preparation property earlier, under normal steam water-level definite value operating mode, carrying out heat pump tripping operation RB again and examining the property test.
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| CN104197367A (en) * | 2014-08-04 | 2014-12-10 | 国家电网公司 | Primary air fan RB optimal control method based on mother tube pressure |
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