CN110479053A - It is a kind of list pid loop add feed-forward regulation desulfurization for starch flow device and control method - Google Patents
It is a kind of list pid loop add feed-forward regulation desulfurization for starch flow device and control method Download PDFInfo
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- CN110479053A CN110479053A CN201910866809.5A CN201910866809A CN110479053A CN 110479053 A CN110479053 A CN 110479053A CN 201910866809 A CN201910866809 A CN 201910866809A CN 110479053 A CN110479053 A CN 110479053A
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 68
- 230000023556 desulfurization Effects 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000033228 biological regulation Effects 0.000 title claims abstract description 16
- 229920002472 Starch Polymers 0.000 title description 5
- 235000019698 starch Nutrition 0.000 title description 5
- 239000008107 starch Substances 0.000 title description 4
- 239000002002 slurry Substances 0.000 claims abstract description 93
- 230000008859 change Effects 0.000 claims abstract description 22
- 238000009955 starching Methods 0.000 claims abstract description 13
- 230000003009 desulfurizing effect Effects 0.000 claims description 25
- 238000011010 flushing procedure Methods 0.000 claims description 19
- 230000007423 decrease Effects 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000005507 spraying Methods 0.000 claims description 14
- 238000000738 capillary electrophoresis-mass spectrometry Methods 0.000 claims description 10
- 238000007254 oxidation reaction Methods 0.000 claims description 10
- 102100029469 WD repeat and HMG-box DNA-binding protein 1 Human genes 0.000 claims description 9
- 101710097421 WD repeat and HMG-box DNA-binding protein 1 Proteins 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 9
- 230000003647 oxidation Effects 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 239000000779 smoke Substances 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000010354 integration Effects 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 210000000056 organ Anatomy 0.000 claims 1
- 230000000007 visual effect Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000003546 flue gas Substances 0.000 description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 14
- 235000019738 Limestone Nutrition 0.000 description 13
- 239000006028 limestone Substances 0.000 description 13
- 238000010521 absorption reaction Methods 0.000 description 11
- 235000008247 Echinochloa frumentacea Nutrition 0.000 description 7
- 240000004072 Panicum sumatrense Species 0.000 description 7
- 229940122605 Short-acting muscarinic antagonist Drugs 0.000 description 7
- 238000011217 control strategy Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 6
- 239000010440 gypsum Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 229910052602 gypsum Inorganic materials 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 235000011132 calcium sulphate Nutrition 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 2
- 235000010261 calcium sulphite Nutrition 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000001175 calcium sulphate Substances 0.000 description 1
- 239000006071 cream Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/346—Controlling the process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a kind of single pid loops, and feed-forward regulation desulfurization to be added to be related to fired power generating unit denitration technology field for the device and control method of slurry flow.The present invention includes that desulfurization slurry pH value is adjusted by pid loop, and the output of pid loop after amplitude limit link Lmt1, is applied to desulfurization using hand automatic imitation amount controller TAI and adjusts valve regulation for starching uninterrupted for slurry plus the sum of three feedforwards.Three feedforwards include the change rate of boiler load, the change rate of chimney entrance so2 concentration and the function of chimney entrance so2 concentration.The present invention solves the problems, such as to only rely on single pH value pid loop control lag big by increasing change rate, the change rate of chimney entrance so2 concentration and the function of chimney entrance so2 concentration of unit load.
Description
Technical field
The invention belongs to fired power generating unit denitration technology fields, add feed-forward regulation desulfurization more particularly to a kind of single pid loop
Add feed-forward regulation desulfurization for the control method of slurry flow for the device and a kind of single pid loop for starching flow.
Background technique
Desulfurization in power plant is generally adjusted by controlling to adjust single pid loop of gypsum slurries pH value for starching flow for starching.
Lime stone slurry is delivered to desulfuration absorbing tower by slurries supply pump, and for flow by controlling for slurry regulating valve, flow inlet road is equipped with stream
Meter measures the flow of lime stone slurry.Absorption tower slurry pH value is important control parameter during desulfurization operation, direct shadow
Ring the multinomial performance index including desulfuration efficiency.On the one hand, pH value influences SO2Absorption process, on the other hand, pH value shadow
Ring CaCO3、CaSO3Deng solubility.Absorption tower slurries pH is too low, is conducive to CaCO3Dissolution, CaSO3Oxidation and gypsum
Crystallization, but it is unfavorable for SO2Absorption；PH is excessively high, is conducive to SO2Absorption, but be unfavorable for CaCO3Dissolution, influence lime stone
Utilization rate, while CaCO in gypsum3Content increases.In conjunction with the operating experience of correlated performance test and desulphurization system, lime stone-stone
Cream wet desulphurization single column technique slurries pH is preferably controlled between 5.0~5.8.The control of absorption tower slurry pH value and boiler load,
SO in desulfurization inlet flue gas2Concentration, lime stone slurry density are related, for the determining lime stone for needing to be delivered to desulfuration absorbing tower
The flow of slurries.PH value increases, and limestone slurry flow quantity will be reduced；PH value reduces, and limestone slurry flow quantity will increase.
Desulfurization is for slurry control strategy SAMA figure in general power plant, as shown in Figure 1.Desulfurization uses list PID for slurry control logic
Circuit control, desulfurization slurry pH measured value and setting value are compared, and then pass through proportional integral differential (PID) operation control
The flow of lime stone slurry does not consider boiler load, SO in flue gas without feedforward in control logic2Concentration variation is adjusted to for slurry
Influence.After original is automatically engaged for slurry, since the pH value and operating condition of setting mismatch, desulfurization exports SO2Fluctuation of concentration
Larger, instantaneous value often exceeds 35mg/m3, cause for slurry automatic input rate it is low, operations staff by carries out manually for slurry adjust.
Operations staff is larger for slurry hysteresis quality manually, violent for slurry flowed fluctuation, chimney entrance SO2Fluctuation of concentration is big, or even bears
Value or bad point, data do not meet environmental requirement.It also be easy to cause the waste or deficiency of lime stone slurry simultaneously.In addition, in pH table
During meter rinses, desulfurization slurry pH value often exceeds the ceiling value of setting, thus cut desulfurization manually for slurry, after the completion of flushing,
Operations staff is needed to switch to again automatically for slurry.At the end of chimney entrance CEMS blowback is swept, SO2Step change can occur for concentration
Change, desulfurization can also be switched to for slurry and be manually controlled, these not only reduce the automatization level of subsidiary engine, while also increasing operation
The labor intensity of personnel.
Summary of the invention
The purpose of the present invention is to provide a kind of single pid loops to add feed-forward regulation desulfurization for the device and controlling party of slurry flow
Method, by the change rate, the chimney entrance SO that increase unit load2The change rate and chimney entrance SO of concentration2The function of concentration,
It solves the problems, such as to only rely on single pH value pid loop control lag big.
In order to solve the above technical problems, the present invention is achieved by the following technical solutions:
The present invention is that a kind of single pid loop adds feed-forward regulation desulfurization for starching the device and control method of flow, including as follows
Step:
The acquisition of step 1, feed-forward signal: the feed-forward signal includes the change rate of boiler load, chimney entrance SO2Concentration
Change rate and chimney entrance SO2The function of concentration；
Wherein, after acquisition boiler load amount is sent to first order inertial loop Leadlag2, it is applied to adder ∑ 1 all the way,
Another way is applied to first order inertial loop Leadlag3, on the output action to adder ∑ 1 of Leadlag3, and in adder ∑
Deviation between the two is sought on 1, gained deviation is the change rate of boiler load；
Wherein, chimney entrance SO is obtained2After concentration transmits first order inertial loop Leadlag4, it is applied to adder ∑ all the way
On 2, another way is applied on first order inertial loop Leadlag5, on the output action to adder ∑ 2 of Leadlag5, and is being added
Deviation between the two is sought on musical instruments used in a Buddhist or Taoist mass ∑ 2, gained deviation is chimney entrance SO2The change rate of concentration；Acquisition cigarette simultaneously
Chimney entrance SO2Wherein there are also function f (x) is applied to all the way after concentration transmission first order inertial loop Leadlag4, by function f
(x) desulfurization is scaled after for starching control valve opening size, using amplitude limit link Lmt2 up to chimney entrance SO2The letter of concentration
Number；
Step 2 obtains desulfurization slurry pH measured value after first order inertial loop Leadlag1 as the process of pid loop
Value, setting value of the desulfurization slurry pH setting value as pid loop, pid loop use proportional integration operation；
Step 3, will acquire three feed-forward signal and PID adjust the common superposition of result of operation to adder ∑
After 3, continue to be applied to amplitude limit link Lmt1, be remake after amplitude limit link Lmt1 with automatic imitation amount controller TAI in one's hands, hand
The output action of automatic imitation amount controller TAI is to desulfurization for starching regulating valve.
It further, further include that will acquire desulfurization slurry pH measured value to be applied to after first order inertial loop Leadlag1
The output of high/low picture monitor H/L, high/low picture monitor H/L be input to after device TD_ON1 when extra pulse rising edge with
The input of manual MRE is cut in door AND1, the output with door AND1 as the logic interfacing of MASTATION.
Further, further include pH meter flushing water electrically operated gate opened feedback signal passages through which vital energy circulates sweep away drop delayer TD_OFF1
Output is input to and door AND1 after NOT gate N1；PH meter flushing water electrically operated gate ON signal through extra pulse decline delayer TD_
Be input to after OFF2 with door AND2, for slurry regulating valve cut manual ringing be input to after NOT gate N2 with door AND2, with door AND2
Output be used as or the input of door OR or the output of door OR while being applied to the logic interfacing block decrease LWI of MASTATION and closing
Lock increases RAI.
Further, further include chimney entrance CEMS system blowback sweep signal can first pass through pulse rise delayer TD_
ON2, then needs to decline through extra pulse delayer TD_OFF3, pulse decline the output of delayer TD_OFF3 as or door OR
Input or the output of door OR while the logic interfacing block decrease LWI and block increase RAI that are applied to MASTATION.
It is a kind of list pid loop add feed-forward regulation desulfurization for starch flow device, including desulfurizing tower, slurry supply pump, oxidation fan,
Spraying layer, demister and circulating pump are disposed with demister and spraying layer in the desulfurizing tower from top to bottom；The desulfurizing tower
Upper end side be provided with flushing water electrically operated gate, the flushing water electrically operated gate is located at the top of demister；The desulfurizing tower passes through
One circulating pump is connected to spraying layer；The desulfurizing tower side, which is located at below spraying layer, is provided with smoke inlet；The desulfurizing tower
Top is provided with exhanst gas outlet；It is parallel with electronic desulfurization between the slurry supply pump and desulfurizing tower and adjusts pump and manual desulfurization confession for slurry
Slurry adjusts pump；It is connected with an electromagnetic flow valve between the oxidation fan and desulfurizing tower, oxidation wind is controlled by electromagnetic flow valve
The throughput of machine.
Further, the smoke inlet and exhanst gas outlet are respectively connected with a flue gas concentration detector, flue gas concentration inspection
Survey the concentration of original flue gas when instrument is used to detect smoke inlet；Neat stress is dense when one flue gas concentration detector is for exhanst gas outlet
Degree.
Further, flushing water electrically operated gate side is combined with technique flushing water water injector.
The invention has the following advantages:
1, change rate, chimney entrance SO that the present invention passes through increase unit load2The change rate and chimney entrance of concentration
SO2The function of concentration, solves the problems, such as to only rely on single pH value pid loop control lag big, ensure that absorption tower slurries pH
Value fuctuation within a narrow range, chimney entrance SO above and below setting value2Concentration is stably maintained at 25mg/m3, and (minimum discharge requires to be less than
35mg/m3) hereinafter, meeting the requirement of minimum discharge.
2, the present invention increases locking when the blowback of CEMS system is swept and supplies by increasing the manual logic of flushing water electrically operated gate Kai Shiqie
It starches regulating valve and exports control instruction logic, ensure that desulfurization puts into operation for slurry automatic adjustment overall process continuous-stable, alleviate
Operations staff's labor intensity improves auxiliaries automation level.
Certainly, it implements any of the products of the present invention and does not necessarily require achieving all the advantages described above at the same time.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, will be described below to embodiment required
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is that desulfurization is schemed for slurry control strategy SAMA in general power plant in embodiment 2；
Fig. 2 is desulfurizer schematic diagram in embodiment 2；
Fig. 3 is inventive desulfurization for slurry control strategy SAMA figure；
Fig. 4 is plant system drawing of the desulfurization for slurry of the application.
In attached drawing 2, parts list represented by the reference numerals are as follows:
1- desulfurizing tower, 2- slurry supply pump, 3- oxidation fan, 4- circulating pump, 5- demister, 6- spraying layer.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all other
Embodiment shall fall within the protection scope of the present invention.
A kind of single pid loop adds feed-forward regulation desulfurization for starching the device of flow as shown in Figure 4, including desulfurizing tower, slurry supply pump,
Oxidation fan, spraying layer, demister and circulating pump are disposed with demister and spraying layer in the desulfurizing tower from top to bottom；
The upper end side of the desulfurizing tower is provided with flushing water electrically operated gate, and the flushing water electrically operated gate is located at the top of demister；It is described
Desulfurizing tower is connected to by a circulating pump with spraying layer；The desulfurizing tower side, which is located at below spraying layer, is provided with smoke inlet；
Exhanst gas outlet is provided at the top of the desulfurizing tower；Be parallel between the slurry supply pump and desulfurizing tower electronic desulfurization for slurry adjust pump and
Manual desulfurization adjusts pump for slurry；It is connected with an electromagnetic flow valve between the oxidation fan and desulfurizing tower, passes through electromagnetic flow valve
Control the throughput of oxidation fan.
Further, the smoke inlet and exhanst gas outlet are respectively connected with a flue gas concentration detector, flue gas concentration inspection
Survey the concentration of original flue gas when instrument is used to detect smoke inlet；Neat stress is dense when one flue gas concentration detector is for exhanst gas outlet
Degree.
Embodiment 1
It is a kind of list pid loop add feed-forward regulation desulfurization for starch flow device and control method, include the following steps:
The acquisition of step 1, feed-forward signal: the feed-forward signal includes the change rate of boiler load, chimney entrance SO2Concentration
Change rate and chimney entrance SO2The function of concentration；
Wherein, after acquisition boiler load amount is sent to first order inertial loop Leadlag2, it is applied to adder ∑ 1 all the way,
Another way is applied to first order inertial loop Leadlag3, on the output action to adder ∑ 1 of Leadlag3, and in adder ∑
Deviation between the two is sought on 1, gained deviation is the change rate of boiler load；
Wherein, chimney entrance SO is obtained2After concentration transmits first order inertial loop Leadlag4, it is applied to adder ∑ all the way
On 2, another way is applied on first order inertial loop Leadlag5, on the output action to adder ∑ 2 of Leadlag5, and is being added
Deviation between the two is sought on musical instruments used in a Buddhist or Taoist mass ∑ 2, gained deviation is chimney entrance SO2The change rate of concentration；Acquisition cigarette simultaneously
Chimney entrance SO2Wherein there are also function f (x) is applied to all the way after concentration transmission first order inertial loop Leadlag4, by function f
(x) desulfurization is scaled after for starching control valve opening size, using amplitude limit link Lmt2 up to chimney entrance SO2The letter of concentration
Number；
Step 2 obtains desulfurization slurry pH measured value after first order inertial loop Leadlag1 as the process of pid loop
Value, setting value of the desulfurization slurry pH setting value as pid loop, pid loop use proportional integration operation；
Step 3, will acquire three feed-forward signal and PID adjust the common superposition of result of operation to adder ∑
After 3, continue to be applied to amplitude limit link Lmt1, be remake after amplitude limit link Lmt1 with automatic imitation amount controller TAI in one's hands, hand
The output action of automatic imitation amount controller TAI is to desulfurization for starching regulating valve.
It further, further include that will acquire desulfurization slurry pH measured value to be applied to after first order inertial loop Leadlag1
The output of high/low picture monitor H/L, high/low picture monitor H/L be input to after device TD_ON1 when extra pulse rising edge with
The input of manual MRE is cut in door AND1, the output with door AND1 as the logic interfacing of MASTATION.
Further, further include pH meter flushing water electrically operated gate opened feedback signal passages through which vital energy circulates sweep away drop delayer TD_OFF1
Output is input to and door AND1 after NOT gate N1；PH meter flushing water electrically operated gate ON signal through extra pulse decline delayer TD_
Be input to after OFF2 with door AND2, for slurry regulating valve cut manual ringing be input to after NOT gate N2 with door AND2, with door AND2
Output be used as or the input of door OR or the output of door OR while being applied to the logic interfacing block decrease LWI of MASTATION and closing
Lock increases RAI.
Further, further include chimney entrance CEMS system blowback sweep signal can first pass through pulse rise delayer TD_
ON2, then needs to decline through extra pulse delayer TD_OFF3, pulse decline the output of delayer TD_OFF3 as or door OR
Input or the output of door OR while the logic interfacing block decrease LWI and block increase RAI that are applied to MASTATION.
Embodiment 2
Certain No.3 in Power Plant unit (335MW) is using SO in Limestone-gypsum Wet Flue Gas Desulfurization Process single column technology controlling and process flue gas2Row
It puts, 5 layers of spraying layer, Ta Neibu tray and gas gathering ring is set in absorption tower.Coal-fired sulfur content (enters under design conditions for 1.3%
Mouth SO2Concentration 3000mg/m3), export SO2Concentration is less than 35mg/m3, and desulfuration efficiency is not less than 98.85%, Desulfurization Control Systems
Using the Ovation system of Ai Mosheng company.SO during the generator set desulfurization facility operation2Although concentration of emission can satisfy super
Low emission requirement, but desulfurization is bad for slurry automatic control effect, devoting rate is not high, carries out adjusting for slurry manually by operations staff
It is whole, export SO2Concentration, absorption tower slurries pH fluctuation are big, are unfavorable for desulphurization system stable operation.
Wet desulfurization of flue gas by limestone-gypsum method device working principle: flue gas enters in absorption tower through boiler flue, with spray
Slurries counter current contacting carries out physics, chemical reaction, finally generates CaSO4Gypsum.Its physical-chemical reaction sequence are as follows:
(1) gaseous state SO2Sulfurous acid is generated with slurries mixed dissolution is absorbed；
(2) sulfurous acid and lime stone solution reaction generate calcium sulfite；
(3) calcium sulfite is oxidized generation calcium sulfate；
(4) crystallization reaction occurs in conjunction with water for calcium sulfate；
(5) calcium sulphate crystal is separated from absorbent.
When making absorbent with lime stone, SO2Chemical reaction simplified style in absorption tower is as follows:
2CaCO3+2SO2+O2+4H2O→2CaSO4·2H2O+2CO2
In conjunction with the operating experience of correlated performance test and desulphurization system, when slurry pH value is between 5.0-5.8, flue gas is de-
Sulphur effect is best.Therefore, in order to ensure continuing efficiently to absorb SO2, it is necessary to by adjusting for starching pitch, make slurry pH value control
Between 5.0-5.8.
The generator set desulfurization is as shown in Figure 1 for slurry control strategy SAMA figure.Desulfurization is for slurry control logic using single pid loop control
System, desulfurization slurry pH measured value and setting value are compared, and then pass through proportional integral differential (PID) operation control lime stone
The flow of slurries does not consider boiler load, SO in flue gas without feedforward in control logic2Influence of the concentration variation to being adjusted for slurry.
After original is automatically engaged for slurry, since the pH value and operating condition of setting mismatch, desulfurization exports SO2Fluctuation of concentration is larger, wink
Duration often exceeds 35mg/m3, cause for slurry automatic input rate it is low, operations staff by carries out manually for slurry adjust.Run people
Member is larger for slurry hysteresis quality manually, violent for slurry flowed fluctuation, chimney entrance SO2Fluctuation of concentration is big, or even negative value or bad occurs
Point, data do not meet environmental requirement.It also be easy to cause the waste or deficiency of lime stone slurry simultaneously.In addition, being rinsed in pH meter
Period, desulfurization slurry pH value often exceed the ceiling value of setting, so that desulfurization be made to cut manually for slurry, after the completion of flushing, need to transport
Administrative staff is switched to automatically again for slurry.When chimney entrance CEMS blowback is swept, SO2Spline smoothing can occur for concentration, and desulfurization is for slurry
Also it can switch to and manually control.
It is as shown in Figure 2 using the present invention such as control method as shown in Figure 3 in embodiment 1, desulfurizer schematic diagram.
Some important parameters are provided that in Fig. 3 control strategy SAMA figure
Function f (x) is provided that in feedforward 3
| x | 0 | 15 | 20 | 25 | 35 | 43 |
| f(x) | 0 | 0 | 12.5 | 27.5 | 67.5 | 100 |
In Fig. 3 control strategy SAMA figure, ceiling value H is set as 6 in high/low picture monitor H/L, and lower limit value L is set as 4.It should
The pH meter of unit rinses 5 minutes every time, because flushing water pH value is bigger than normal, after pH value often exceeds 7 when flushing, and pH meter rinses
90 seconds pH just restore to normal value, cut manually when pH meter rinses in order to prevent for slurry pitch, in logic after optimization, in pulse
It rises delayer TD_ON1 delay time to be set as 15 seconds, pulse decline delayer TD_OFF1 delay time is set as 120 seconds, under pulse
Drop delayer TD_OFF2 delay time is set as 120 seconds.
Unit CEMS blowback sweeps the duration 90 seconds in the present embodiment, and after CEMS blowback sweeps end 180 seconds, oxygen amount is just restored
It to regime values, therefore is cut manually at the end of CEMS blowback is swept for slurry pitch in order to prevent, in Fig. 3 control strategy SAMA figure
In, pulse rises delayer TD_ON2 delay time and is set as 40 seconds, and pulse decline delayer TD_OFF3 delay time is set as 260
Second, it is ensured that CEMS blowback, which is swept, to be terminated still to make within a period of time for slurry pitch block increase and block decrease.
After control method of the invention, the chimney entrance SO that detects2Concentration value is low while stability of concentration is high,
The boiler load detected is low and is less prone to excess load phenomenon.
In the description of this specification, the description of reference term " one embodiment ", " example ", " specific example " etc. means
Particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one implementation of the invention
In example or example.In the present specification, schematic expression of the above terms may not refer to the same embodiment or example.
Moreover, particular features, structures, materials, or characteristics described can be in any one or more of the embodiments or examples to close
Suitable mode combines.
Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.There is no detailed for preferred embodiment
All details are described, are not limited the invention to the specific embodiments described.Obviously, according to the content of this specification,
It can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is in order to better explain the present invention
Principle and practical application, so that skilled artisan be enable to better understand and utilize the present invention.The present invention is only
It is limited by claims and its full scope and equivalent.
Claims (5)
1. a kind of list pid loop adds feed-forward regulation desulfurization for the control method of slurry flow, which comprises the steps of:
The acquisition of step 1, feed-forward signal: the feed-forward signal includes the change of the change rate of boiler load, chimney entrance so2 concentration
The function of rate and chimney entrance so2 concentration；
Wherein, after acquisition boiler load amount is sent to first order inertial loop Leadlag2, it is applied to adder ∑ 1 all the way, it is another
Road is applied to first order inertial loop Leadlag3, on the output action to adder ∑ 1 of Leadlag3, and on adder ∑ 1
Deviation between the two is sought, gained deviation is the change rate of boiler load；
Wherein, it after obtaining chimney entrance so2 concentration transmission first order inertial loop Leadlag4, is applied on adder ∑ 2 all the way,
Another way is applied on first order inertial loop Leadlag5, on the output action to adder ∑ 2 of Leadlag5, and in adder
Deviation between the two is sought on ∑ 2, gained deviation is the change rate of chimney entrance so2 concentration；Acquisition chimney simultaneously enters
It is also wherein applied to function f (x) all the way after mouth SO2 concentration transmission first order inertial loop Leadlag4, after function f (x)
Desulfurization is scaled for starching control valve opening size, using amplitude limit link Lmt2 up to the function of chimney entrance so2 concentration；
Step 2 obtains desulfurization slurry pH measured value after first order inertial loop Leadlag1 as the process values of pid loop,
Setting value of the desulfurization slurry pH setting value as pid loop, pid loop use proportional integration operation；
After step 3, will acquire three feed-forward signal and PID adjust the result common superposition to adder ∑ 3 of operation,
Continue to be applied to amplitude limit link Lmt1, be remake after amplitude limit link Lmt1 with automatic imitation amount controller TAI in one's hands, hand is automatic
The output action of analog quantity controller TAI is to desulfurization for starching regulating valve.
2. a kind of single pid loop according to claim 1 adds feed-forward regulation desulfurization for the control method of slurry flow, feature
It is, further includes that will acquire desulfurization slurry pH measured value to be applied to high/low signal prison after first order inertial loop Leadlag1
The output of visual organ H/L, high/low picture monitor H/L be input to after device TD_ON1 when extra pulse rising edge with door AND1, with door
The input of manual MRE is cut in the output of AND1 as the logic interfacing of MASTATION.
3. a kind of single pid loop according to claim 1 adds feed-forward regulation desulfurization for the control method of slurry flow, feature
It is, further includes that pH meter flushing water electrically operated gate has opened feedback signal passages through which vital energy circulates and sweeps away the output of drop delayer TD_OFF1 by NOT gate
It is input to after N1 and door AND1；ON signal is input to pH meter flushing water electrically operated gate after extra pulse declines delayer TD_OFF2
With door AND2, for slurry regulating valve cut manual ringing be input to after NOT gate N2 with door AND2, be used as with the output of door AND2 or
The input of door OR or the output of door OR while the logic interfacing block decrease LWI and block increase RAI that are applied to MASTATION.
4. a kind of single pid loop according to claim 1 adds feed-forward regulation desulfurization for the control method of slurry flow, feature
Be, further include chimney entrance CEMS system blowback sweep signal can first pass through pulse rise delayer TD_ON2, then need through
Extra pulse declines delayer TD_OFF3, pulse decline the output of delayer TD_OFF3 as or door OR input or door OR
Output while the logic interfacing block decrease LWI and block increase RAI for being applied to MASTATION.
5. a kind of list pid loop adds feed-forward regulation desulfurization for the device of slurry flow, including desulfurizing tower (1), slurry supply pump (2), oxidation
Blower (3), spraying layer (6), demister (5) and circulating pump (4), it is characterised in that:
It is disposed with demister (5) and spraying layer (6) from top to bottom in the desulfurizing tower (1)；The upper end of the desulfurizing tower (1)
Side is provided with flushing water electrically operated gate, and the flushing water electrically operated gate is located at the top of demister (5)；The desulfurizing tower (1) passes through
One circulating pump (4) is connected to spraying layer (6)；
Desulfurizing tower (1) side, which is located at below spraying layer (6), is provided with smoke inlet；Setting at the top of the desulfurizing tower (1)
There is exhanst gas outlet；
It is parallel with electronic desulfurization between the slurry supply pump (2) and desulfurizing tower (1) and adjusts pump and manual desulfurization for slurry adjusting pump for slurry；
An electromagnetic flow valve is connected between the oxidation fan (3) and desulfurizing tower (1).
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111111392A (en) * | 2019-12-30 | 2020-05-08 | 杭州电子科技大学 | SO during CEMS table back blowing of power plant2Concentration on-line automatic control method |
| CN111729481A (en) * | 2020-06-05 | 2020-10-02 | 浙江浩普智能科技有限公司 | Pulse control method and system for limestone slurry in wet desulphurization of coal-fired power plant |
| CN113144844A (en) * | 2021-03-22 | 2021-07-23 | 国家能源集团国源电力有限公司 | Desulfurizer flow control method and device and coal combustion system |
| CN113457396A (en) * | 2021-06-29 | 2021-10-01 | 华能伊敏煤电有限责任公司 | Ammonia spraying automatic control method based on SCR denitration control system of thermal power plant |
| CN113655825A (en) * | 2021-07-05 | 2021-11-16 | 国能龙源环保有限公司 | Sensitive and economical wet desulphurization spraying slurry pH value control method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06182148A (en) * | 1992-12-22 | 1994-07-05 | Babcock Hitachi Kk | Controlling apparatus for wet flue gas desulfurization apparatus |
| JPH0871364A (en) * | 1994-09-07 | 1996-03-19 | Babcock Hitachi Kk | Method and apparatus for controlling supply amount of absorbent in wet exhaust gas desulfurization equipment |
| CN107648988A (en) * | 2017-08-08 | 2018-02-02 | 华电电力科学研究院 | A kind of device and method of double loop regulation desulfurization for slurry flow |
| CN207430019U (en) * | 2017-08-02 | 2018-06-01 | 中清源环保节能有限公司 | A kind of Hazards in Power Plant minimum discharge ammonia method desulfurizing system |
| CN207822767U (en) * | 2017-12-29 | 2018-09-07 | 贵州黔东电力有限公司 | A kind of heat-engine plant wet desulfurization outlet SO2 emission control circuits |
| CN109101049A (en) * | 2018-10-26 | 2018-12-28 | 马鞍山当涂发电有限公司 | A kind of desulfuration absorbing tower pH value is exchanged work frequency hybrid control system and method |
| CN210699477U (en) * | 2019-09-12 | 2020-06-09 | 华电国际电力股份有限公司邹县发电厂 | Device for adjusting desulfurization slurry supply flow rate by adding feedforward to single PID loop |
-
2019
- 2019-09-12 CN CN201910866809.5A patent/CN110479053A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06182148A (en) * | 1992-12-22 | 1994-07-05 | Babcock Hitachi Kk | Controlling apparatus for wet flue gas desulfurization apparatus |
| JPH0871364A (en) * | 1994-09-07 | 1996-03-19 | Babcock Hitachi Kk | Method and apparatus for controlling supply amount of absorbent in wet exhaust gas desulfurization equipment |
| CN207430019U (en) * | 2017-08-02 | 2018-06-01 | 中清源环保节能有限公司 | A kind of Hazards in Power Plant minimum discharge ammonia method desulfurizing system |
| CN107648988A (en) * | 2017-08-08 | 2018-02-02 | 华电电力科学研究院 | A kind of device and method of double loop regulation desulfurization for slurry flow |
| CN207822767U (en) * | 2017-12-29 | 2018-09-07 | 贵州黔东电力有限公司 | A kind of heat-engine plant wet desulfurization outlet SO2 emission control circuits |
| CN109101049A (en) * | 2018-10-26 | 2018-12-28 | 马鞍山当涂发电有限公司 | A kind of desulfuration absorbing tower pH value is exchanged work frequency hybrid control system and method |
| CN210699477U (en) * | 2019-09-12 | 2020-06-09 | 华电国际电力股份有限公司邹县发电厂 | Device for adjusting desulfurization slurry supply flow rate by adding feedforward to single PID loop |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111111392A (en) * | 2019-12-30 | 2020-05-08 | 杭州电子科技大学 | SO during CEMS table back blowing of power plant2Concentration on-line automatic control method |
| CN111729481A (en) * | 2020-06-05 | 2020-10-02 | 浙江浩普智能科技有限公司 | Pulse control method and system for limestone slurry in wet desulphurization of coal-fired power plant |
| CN113144844A (en) * | 2021-03-22 | 2021-07-23 | 国家能源集团国源电力有限公司 | Desulfurizer flow control method and device and coal combustion system |
| CN113144844B (en) * | 2021-03-22 | 2022-09-16 | 国家能源集团国源电力有限公司 | Desulfurizer flow control method and device and coal combustion system |
| CN113457396A (en) * | 2021-06-29 | 2021-10-01 | 华能伊敏煤电有限责任公司 | Ammonia spraying automatic control method based on SCR denitration control system of thermal power plant |
| CN113457396B (en) * | 2021-06-29 | 2023-12-22 | 华能伊敏煤电有限责任公司 | Automatic ammonia spraying control method based on SCR denitration control system of thermal power plant |
| CN113655825A (en) * | 2021-07-05 | 2021-11-16 | 国能龙源环保有限公司 | Sensitive and economical wet desulphurization spraying slurry pH value control method |
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