CN109126408A - A kind of wet desulphurization device and intelligent control method - Google Patents
A kind of wet desulphurization device and intelligent control method Download PDFInfo
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- CN109126408A CN109126408A CN201811200022.7A CN201811200022A CN109126408A CN 109126408 A CN109126408 A CN 109126408A CN 201811200022 A CN201811200022 A CN 201811200022A CN 109126408 A CN109126408 A CN 109126408A
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 66
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 210000002966 serum Anatomy 0.000 claims abstract description 17
- 238000005457 optimization Methods 0.000 claims abstract description 13
- 239000002002 slurry Substances 0.000 claims description 71
- 239000010440 gypsum Substances 0.000 claims description 62
- 229910052602 gypsum Inorganic materials 0.000 claims description 62
- 239000003546 flue gas Substances 0.000 claims description 50
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 49
- 239000007787 solid Substances 0.000 claims description 43
- 238000000926 separation method Methods 0.000 claims description 36
- 238000006243 chemical reaction Methods 0.000 claims description 35
- 239000007789 gas Substances 0.000 claims description 35
- 239000007788 liquid Substances 0.000 claims description 24
- 238000001514 detection method Methods 0.000 claims description 23
- 238000001914 filtration Methods 0.000 claims description 18
- 238000009790 rate-determining step (RDS) Methods 0.000 claims description 18
- 235000019738 Limestone Nutrition 0.000 claims description 14
- 230000023556 desulfurization Effects 0.000 claims description 14
- 239000006028 limestone Substances 0.000 claims description 14
- 230000003647 oxidation Effects 0.000 claims description 12
- 238000007254 oxidation reaction Methods 0.000 claims description 12
- 239000003245 coal Substances 0.000 claims description 9
- 239000000446 fuel Substances 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 7
- 239000005864 Sulphur Substances 0.000 claims description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 7
- 239000004571 lime Substances 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 6
- 230000003009 desulfurizing effect Effects 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000006071 cream Substances 0.000 claims 1
- 239000004575 stone Substances 0.000 claims 1
- 238000011217 control strategy Methods 0.000 abstract description 3
- 238000010521 absorption reaction Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 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
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
-
- 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
- B01D53/30—Controlling by gas-analysis apparatus
-
- 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
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- 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
- B01D53/96—Regeneration, reactivation or recycling of reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/606—Carbonates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/608—Sulfates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention discloses a kind of wet desulphurization device and intelligent control methods, including boiler 1, desulfuration absorbing tower 5 and serum recycle pump group 7, and intelligent control, intelligent control includes distributed AC servo system server and optimal controller, the control strategy that the present invention passes through the optimization desulphurization system in optimal controller, increase Intelligentized Control Model and control loop, modernization system fractional hardware (blower, water pump, valve) simultaneously, the Intelligent closed-loop control algolithm of predictive control model is added, realizes the intelligentized control method of desulphurization system.
Description
Technical field
The present invention relates to a kind of wet desulphurization device more particularly to a kind of intelligent control methods of wet desulphurization device, belong to
In flue gases purification field.
Background technique
Most domestic power plant wet desulphurization control system at present, the PID for realizing pH value are automatically controlled, but desulfurization degree
Control needs manual setting pH value to remove control desulfurization degree, this brings very big behaviour to operations staff also in adjusted open loop state
It bears.
Desulfuration absorbing tower smoke reaction is the process an of large time delay, slow dynamics, and regulatory PID control strategy controls pH value
Quality is also not highly desirable, and operations staff can usually remove manual, is done by directly adjusting limestone slurry flow quantity tune valve
In advance, it is easy to cause the generation of absorption tower blind area.
As environmental requirement is increasingly strict, the following desulfurization degree and outlet SO2Concentration will all be included in examination, however conventional control
System processed will be unable to realize the function of closed-loop control, cannot achieve desulfurization degree, outlet SO2The multiple target closed-loop control of concentration.
Major part desulphurization control optimization system is there are some problems at present, the desulfurizing tower disengaging including the acquisition of 1) control system
Mouth SO2Concentration measurement does not have representativeness, larger with the average value of flue gas, chimney measured value and desulfurizing tower outlet occurs
It is worth inversion phenomenon；2) as AGC depth peak regulation is more frequent, coal is changeable, and desulphurization system controls optimization system as the time is excellent
Change effect to be constantly deteriorated, is not able to satisfy optimization aim under multifactor variation；3) existing optimization product mainly reduces lime stone
Power consumption is seldom directly effectively reduced in input amount；4) sensor or instrument fault, partial parameters distortion will lead to optimal control system
Failure of uniting or even discharge beyond standards occur；5) most wet desulfurization system slurry circulating pumps are all switch controls at present, work as pot
Furnace load is much less with exhaust gas volumn, shuts down a water pump, be will lead to serum recycle flow and is reduced suddenly, and then causes to export
SO2Big ups and downs are even exceeded.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides a kind of wet desulphurization device, including
Boiler 1, desulfuration absorbing tower 5 and serum recycle pump group 7, the first pipe 13 and desulfurization that boiler 1 is branched out by main pipeline 16 are inhaled
The gas inlet connection of 5 lower section of tower is received, the lower section of desulfuration absorbing tower 5 extends to lime stock tank 10, lime by second pipe 14
Fresh slurry in stock tank 10 enters after desulfuration absorbing tower 5 reacts to be followed by the serum recycle pump group 7 connecting with desulfuration absorbing tower 5
The reaction of desulfuration absorbing tower 5 is entered back into after ring processing, the bottom of desulfuration absorbing tower 5 extends to gypsum mistake by Separation of gypsum branch 15
Reservoir 12, it is also gypsum recovery pond that gypsum, which filters liquid pool, and solid gypsum stays in pond, and filtrate is recycled.Desulfurization
The side on absorption tower 5 also passes through pipeline and is connected with frequency conversion oxidation fan 3, and freq uency conversion supercharging blower 2 is provided in first pipe 13, the
It is provided with frequency conversion fresh slurry pump 4 on two pipelines 14, is provided with Separation of gypsum branch electric control valve 6 on Separation of gypsum branch 15
With Separation of gypsum water pump 11.
Further, three water pumps are at least contained in serum recycle pump group 7, any water pump is variable frequency pump, other
For common water pump.
Further, SO is provided at gas inlet 172Concentration detection apparatus and flue gas flow meter.
Further, air-introduced machine 9 is provided on main pipeline 16；Boiler is connect by main pipeline 16 with chimney 8；Chimney 8 is also
It is connected with the top of desulfuration absorbing tower 5, absorbs the flue gas being discharged from desulfuration absorbing tower 5.
In order to achieve the purpose that intelligentized control method wet desulphurization device, it is changeable that coal is better met by predicting means
In the case of, the requirement of system stable operation, technical solution of the present invention further include:
A kind of intelligent control method of wet desulphurization device, the control system of device include with variable frequency pump, frequency conversion fan,
Separate the distributed AC servo system server of 6 two-way communication link of branch electric control valve, distributed AC servo system server and optimal control
Device also realizes two-way communication, it is characterised in that includes the following steps:
Rate-determining steps A, SO2The SO that concentration detection apparatus is arrived in 17 position detection of gas inlet of desulfuration absorbing tower 52Concentration
For a, flue gas flow meter is b, the load cigarette of boiler 1 in the flue gas flow that 17 position detection of gas inlet of desulfuration absorbing tower 5 arrives
Throughput is c, and distributed AC servo system server patrols parameter a and b real-time delivery to optimal controller, optimal controller according to control
It collects A and makes optimal control order, and optimal control order is transferred to distributed AC servo system server, distributed AC servo system server is opened
Open or close the common water pump in serum recycle pump group 7；
Rate-determining steps B, when the amplitude that the flue gas flow that flue gas flow meter detects reduces is more than 10%, optimal controller
Optimization order is made according to control logic B, control logic B includes that the flow of adjusting fresh limestone slurries is d, is prolonged by 10s
The slow time, distributed AC servo system server controls to adjust in proportion respectively again reduces freq uency conversion supercharging blower 2,3 and of frequency conversion oxidation fan
The load of frequency conversion fresh limestone slurries pump 4；
Solids concentration parameter information is transferred to distributed AC servo system server by rate-determining steps C, solid concentration sensor, point
Parameter information optimal controller, optimal controller are made optimization order according to control logic C by cloth control server；
Rate-determining steps D, distributed AC servo system server are (single by the air output L1 of boiler 1, fuel mass wear rate W1 in real time
Position kg/s), sulphur, carbon, hydrogen, oxygen, nitrogen mass fraction are respectively Sa, Ca, Ha, O in fuela、NaThe monitoring number of (unit %)
According to being transferred to optimal controller, obtain boiler air-supply volume L1 (unit m by following calculation formula3) under, it will enter after burning de-
Exhaust gas volumn V1 (the unit m per second on sulphur absorption tower3):
V1=(1.867Ca+11.2Ha+0.7Sa+0.8Na+ (1-0.21/ α) L1) W1；Wherein α=(0.0889 (Ca+
0.375Sa)+0.265Ha-0.033Oa)/L1。
SO in flue gas at this time is obtained by following calculation formula2Concentration P (units/kg/Nm3):
P=3.33Sa*W1/V1；
Wherein V1 is real-time fuel consumption rate, and V1 is the exhaust gas volumn being calculated according to coal data；
After optimal controller obtains the data of P, V, according to rate-determining steps B before the flue gas of variation reaches desulfurizing tower, mention
Preceding flow d (the unit m for starting to adjust lime stone slurry3/s)。
Further, the control logic A in rate-determining steps A includes the following:
(1) as a*b < 0.7*e*c, 1/4 of water pump total quantity in loop slurry pump group is closed；
(2) as a*b < 0.45*e*c, the 1/2 of circulation slurry pump total quantity is closed；
(3) as a*b < 0.2*e*c, the 3/4 of circulation slurry pump total quantity is closed；
(4) as a*b > 0.7*e*c, the 1/4 of circulation slurry pump total quantity is opened；
(5) as a*b > 0.45*e*c, the 1/2 of circulation slurry pump total quantity is opened；
(6) as a*b > 0.2*e*c, the 3/4 of circulation slurry pump total quantity is opened；
Wherein a is the flue gas SO that sensor is arrived in 17 position detection of gas inlet of desulfuration absorbing tower 52Concentration, b are flue gas
The flue gas flow that flowmeter is arrived in 17 position detection of gas inlet of desulfuration absorbing tower 5, c are flue gas stream under 1 Design cooling load of boiler
Amount, e are combustion product gases SO under 1 design coal sulphur content of boiler2Concentration.The water pump of closing is the light water in loop slurry pump group
Pump.The quantity for closing circulation slurry pump is calculated according to the value that rounds up, the quantity being even calculated is 0.25, then not
Close the water pump in loop slurry pump group；If the quantity being calculated is 0.75, close general in a loop slurry pump group
Water flowing pump, and so on.
When the control water pump start and stop done according to the above control logic A, when needing to close second in serum recycle pump group
When platform water pump, distributed AC servo system server first starts variable frequency pump, turns off second water pump, then gradually decreases frequency conversion water again
The working frequency of pump, until closing variable frequency pump, variable frequency pump plays the role of slowly adjusting, and avoids the occurrence of cliff of displacement formula start and stop.
Further, the calculation formula of d are as follows:
D=(- 0.0000002*a2*b2+0.0051*a*b-0.1312)*0.25
Wherein a is the flue gas SO that sensor is arrived in 17 position detection of gas inlet of desulfuration absorbing tower 52Concentration, unit are
mg/Nm3, b is the flue gas flow that flue gas flow meter is arrived in 17 position detection of gas inlet of desulfuration absorbing tower 5, unit Nm3。
By after 10s delay time, desulfurization distributed AC servo system server just respectively adjust reduce freq uency conversion supercharging blower 2,
The load of frequency conversion oxidation fan 3 and frequency conversion fresh limestone slurries pump 4, so that flue gas flow rate, fresh slurry in desulfuration absorbing tower 5
CaS0 in liquid3The pH value of oxidation rate and the loop slurry in desulfuration absorbing tower 5 is maintained within the scope of design value, pH value model
Enclose is 5.1~5.68.
Further, the control logic C in rate-determining steps C includes the following:
(1) when solid concentration sensor detects the loop slurry solid volume concentration percentage in gypsum filtering liquid pool 12
When in 13%~15% range, distributed AC servo system server adjusts the aperture for increasing Separation of gypsum branch electric control valve 6, and
Flow is increased to 110% of flow before separation branch electric control valve 6 is adjusted, flow is I at this time；
(2) when solid concentration sensor detects the loop slurry solid volume concentration percentage in gypsum filtering liquid pool 12
When in 15%~17% range, distributed AC servo system server adjusts the aperture for increasing Separation of gypsum branch electric control valve 6, and
Flow is increased to the 110% of flow I；Flow is II at this time；
(3) when solid concentration sensor detects the loop slurry solid volume concentration percentage in gypsum filtering liquid pool 12
When more than 17%, distributed AC servo system server adjusts the aperture for increasing Separation of gypsum branch electric control valve (6), and flow is increased
It is big to arrive the 115% of flow II；Flow is III at this time；
(4) when solid concentration sensor detects the loop slurry solid volume concentration percentage in gypsum filtering liquid pool 12
When being reduced in 15%~17% range, distributed AC servo system server, which is adjusted, reduces opening for Separation of gypsum branch electric control valve 6
Degree, and flow is reduced to the 87% of flow III；Flow is IV at this time；
(5) when solid concentration sensor detects the loop slurry solid volume concentration percentage in gypsum filtering liquid pool 12
When being reduced within 13~15% ranges, distributed AC servo system server, which is adjusted, reduces opening for Separation of gypsum branch electric control valve 6
Degree, and flow is reduced to the 90.9% of flow IV；Flow is V at this time；
(6) when solid concentration sensor detects the loop slurry solid volume concentration percentage in gypsum filtering liquid pool 12
When being reduced to 13% or less, distributed AC servo system server adjusts the aperture for reducing Separation of gypsum branch electric control valve 6, and will stream
Amount is reduced to the 90.9% of flow V.
The utility model has the advantages that 1) by by booster fan, oxidation fan, fresh slurry pump, a slurries in loop slurry pump group
Circulating pump all transform frequency conversion as, and operation power consumption is greatly lowered, and so that system is adjusted operation more steady.
2) predictive control model intelligent control algorithm is added to existing Desulfurization Control Systems, it is better by predicting means
Meet AGC depth peak regulation and coal it is changeable under, system run all right requirement, make export SO2Fluctuating standard deviation reduces, and meets row
Under the requirement put, outlet SO is properly increased2The consumption of raw limestone can be greatly reduced in setting value.
3) by increasing electric control valve in Separation of gypsum branch, equipment attrition and failure rate is effectively reduced, is guaranteed simultaneously
The purity and desulfurization degree of by-produced gypsum.
4) MPC (predictive control model) intelligent control algorithm fault-tolerance is preferable, in device parameter distortion, sensor fault
Under, it is still able to make control system stable operation, avoids enter into blind area and discharge beyond standards accident occurs.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention.
In figure: 1 boiler, 2 booster fans, 3 oxidation fans, 4 fresh slurries pump, 5 desulfuration absorbing towers, 6 Separation of gypsum branches
Electric control valve, 7 serum recycle pump groups, 8 chimneys, 9 air-introduced machines, 10 lime stock tanks, 11 Separation of gypsum water pumps, 12 gypsum filtered fluids
Pond, 13 first pipes, 14 second pipes, 15 Separation of gypsum branches, 16 main pipelines, 17 gas inlets.
Specific embodiment
The present invention will be further explained with reference to the accompanying drawing.
The present invention provides a kind of wet desulphurization device, including boiler 1, desulfuration absorbing tower 5 and serum recycle pump group 7, boiler 1
The first pipe 13 branched out by main pipeline 16 is connect with the gas inlet of 5 lower section of desulfuration absorbing tower, under desulfuration absorbing tower 5
Side extends to lime stock tank 10 by second pipe 14, after the fresh slurry in lime stock tank 10 enters the reaction of desulfuration absorbing tower 5
It is reacted via desulfuration absorbing tower 5 is entered back into after 7 circular treatment of serum recycle pump group connecting with desulfuration absorbing tower 5, desulfurization absorbs
The bottom of tower 5 extends to gypsum by Separation of gypsum branch 15 and filters liquid pool 12, and it is also gypsum recovery pond that gypsum, which filters liquid pool, Gu
Body gypsum stays in pond, and filtrate is recycled.The side of desulfuration absorbing tower 5 also passes through pipeline and is connected with frequency conversion oxidation wind
Machine 3 is provided with freq uency conversion supercharging blower 2 in first pipe 13, and frequency conversion fresh slurry pump 4, gypsum point are provided on second pipe 14
From being provided with Separation of gypsum branch electric control valve 6 and Separation of gypsum water pump 11 on branch 15.Contain three in serum recycle pump group 7
Platform water pump, any water pump are variable frequency pump, and other is common water pump.SO is provided at gas inlet 172Concentration Testing dress
It sets and flue gas flow meter.Air-introduced machine 9 is provided on main pipeline 16；Boiler is connect by main pipeline 16 with chimney 8；Chimney 8 also connects
It is connected to the top of desulfuration absorbing tower 5, absorbs the flue gas being discharged from desulfuration absorbing tower 5.
The present invention also provides a kind of intelligent control method of wet desulphurization device, the control system of device includes and frequency conversion water
The distributed AC servo system server of two-way communication link is pumped, distributed AC servo system server and optimal controller also realize two-way communication,
It is characterized by comprising following steps:
Rate-determining steps A, SO2The SO that concentration detection apparatus is arrived in 17 position detection of gas inlet of desulfuration absorbing tower 52Concentration
For a, flue gas flow meter is b, the load cigarette of boiler 1 in the flue gas flow that 17 position detection of gas inlet of desulfuration absorbing tower 5 arrives
Throughput is c, and distributed AC servo system server patrols parameter a and b real-time delivery to optimal controller, optimal controller according to control
It collects A and makes optimal control order, and optimal control order is transferred to distributed AC servo system server, distributed AC servo system server is opened
Open or close the common water pump in serum recycle pump group 7；
(1) as a*b < 0.7*e*c, 1/4 of water pump total quantity in loop slurry pump group is closed；
(2) as a*b < 0.45*e*c, the 1/2 of circulation slurry pump total quantity is closed；
(3) as a*b < 0.2*e*c, the 3/4 of circulation slurry pump total quantity is closed；
(4) as a*b > 0.7*e*c, the 1/4 of circulation slurry pump total quantity is opened；
(5) as a*b > 0.45*e*c, the 1/2 of circulation slurry pump total quantity is opened；
(6) as a*b > 0.2*e*c, the 3/4 of circulation slurry pump total quantity is opened；
Wherein a is the flue gas SO that sensor is arrived in 17 position detection of gas inlet of desulfuration absorbing tower 52Concentration, b are flue gas
The flue gas flow that flowmeter is arrived in 17 position detection of gas inlet of desulfuration absorbing tower 5, c are flue gas stream under 1 Design cooling load of boiler
Amount, e are combustion product gases SO under 1 design coal sulphur content of boiler2Concentration.The water pump of closing is the light water in loop slurry pump group
Pump.The quantity for closing circulation slurry pump is calculated according to the value that rounds up, the quantity being even calculated is 0.25, then not
Close the water pump in loop slurry pump group；If the quantity being calculated is 0.75, close general in a loop slurry pump group
Water flowing pump, and so on.
When the control water pump start and stop done according to the above control logic A, when needing to close second in serum recycle pump group
When platform water pump, distributed AC servo system server first starts variable frequency pump, turns off second water pump, then gradually decreases frequency conversion water again
The working frequency of pump, until closing variable frequency pump, variable frequency pump plays the role of slowly adjusting, and avoids the occurrence of cliff of displacement formula start and stop.
Rate-determining steps B, when the amplitude that the flue gas flow that flue gas flow meter detects reduces is more than 10%, optimal controller
Optimization order is made according to control logic B, control logic B includes that the flow of adjusting fresh limestone slurries is d, is prolonged by 10s
The slow time, distributed AC servo system server controls to adjust in proportion respectively again reduces freq uency conversion supercharging blower 2,3 and of frequency conversion oxidation fan
The load of frequency conversion fresh limestone slurries pump 4；
The calculation formula of d are as follows:
D=(- 0.0000002*a2*b2+0.0051*a*b-0.1312)*0.25
Wherein a is the flue gas SO that sensor is arrived in 17 position detection of gas inlet of desulfuration absorbing tower 52Concentration, unit are
mg/Nm3, b is the flue gas flow that flue gas flow meter is arrived in 17 position detection of gas inlet of desulfuration absorbing tower 5, unit Nm3。
By after 10s delay time, desulfurization distributed AC servo system server just respectively adjust reduce freq uency conversion supercharging blower 2,
The load of frequency conversion oxidation fan 3 and frequency conversion fresh limestone slurries pump 4, so that flue gas flow rate, fresh slurry in desulfuration absorbing tower 5
CaS0 in liquid3The pH value of oxidation rate and the loop slurry in desulfuration absorbing tower 5 is maintained within the scope of design value, pH value model
Enclose is 5.1~5.68.
Solids concentration parameter information is transferred to distributed AC servo system server by rate-determining steps C, solid concentration sensor, point
Parameter information optimal controller, optimal controller are made optimization order according to control logic C by cloth control server；
Control logic C in rate-determining steps C includes the following:
(1) when solid concentration sensor detects the loop slurry solid volume concentration percentage in gypsum filtering liquid pool 12
When in 13%~15% range, distributed AC servo system server adjusts the aperture for increasing Separation of gypsum branch electric control valve 6, and
Flow is increased to 110% of flow before separation branch electric control valve 6 is adjusted, flow is I at this time；
(2) when solid concentration sensor detects the loop slurry solid volume concentration percentage in gypsum filtering liquid pool 12
When in 15%~17% range, distributed AC servo system server adjusts the aperture for increasing Separation of gypsum branch electric control valve 6, and
Flow is increased to the 110% of flow I；Flow is II at this time；
(3) when solid concentration sensor detects the loop slurry solid volume concentration percentage in gypsum filtering liquid pool 12
When more than 17%, distributed AC servo system server adjusts the aperture for increasing Separation of gypsum branch electric control valve 6, and flow is increased
To the 115% of flow II；Flow is III at this time；
(4) when solid concentration sensor detects the loop slurry solid volume concentration percentage in gypsum filtering liquid pool 12
When being reduced in 15%~17% range, distributed AC servo system server, which is adjusted, reduces opening for Separation of gypsum branch electric control valve 6
Degree, and flow is reduced to the 87% of flow III；Flow is IV at this time；
(5) when solid concentration sensor detects the loop slurry solid volume concentration percentage in gypsum filtering liquid pool 12
When being reduced within 13~15% ranges, distributed AC servo system server, which is adjusted, reduces opening for Separation of gypsum branch electric control valve 6
Degree, and flow is reduced to the 90.9% of flow IV；Flow is V at this time；
(6) when solid concentration sensor detects the loop slurry solid volume concentration percentage in gypsum filtering liquid pool 12
When being reduced to 13% or less, distributed AC servo system server adjusts the aperture for reducing Separation of gypsum branch electric control valve 6, and will stream
Amount is reduced to the 90.9% of flow V.
Rate-determining steps D, distributed AC servo system server are (single by the air output L1 of boiler 1, fuel mass wear rate W1 in real time
Position kg/s), sulphur, carbon, hydrogen, oxygen, nitrogen mass fraction are respectively S in fuela、Ca、Ha、Oa、NaThe monitoring data of (unit %),
It is transferred to optimal controller, obtains boiler air-supply volume L1 (unit m by following calculation formula3) under, desulfurization will be entered after burning
Exhaust gas volumn V1 (the unit m per second on absorption tower3):
V1=(1.867Ca+11.2Ha+0.7Sa+0.8Na+ (1-0.21/ α) L1) W1；Wherein α=(0.0889 (Ca+
0.375Sa)+0.265Ha-0.033Oa)/L1。
SO in flue gas at this time is obtained by following calculation formula2Concentration P (units/kg/Nm3):
P=3.33Sa*W1/V1；
Wherein V1 is real-time fuel consumption rate, and V1 is the exhaust gas volumn being calculated according to coal data；
After optimal controller obtains the data of P, V, according to rate-determining steps B before the flue gas of variation reaches desulfurizing tower, mention
Preceding flow d (the unit m for starting to adjust lime stone slurry3/s)。
The present invention increases Intelligentized Control Model and control by the control strategy of the optimization desulphurization system in optimal controller
Circuit processed, while modernization system fractional hardware (blower, water pump, valve), the Intelligent closed-loop control that predictive control model is added are calculated
Method realizes the intelligentized control method of desulphurization system.
The basic principles, main features and advantages of the invention have been shown and described above.The technical staff of the industry should
Understand, the above embodiments do not limit the invention in any form, all obtained by the way of equivalent substitution or equivalent transformation
Technical solution is fallen within the scope of protection of the present invention.
Claims (8)
1. a kind of wet desulphurization device, including boiler (1), desulfuration absorbing tower (5) and serum recycle pump group (7), the boiler (1)
The first pipe (13) branched out by main pipeline (16) is connect with the gas inlet (17) below desulfuration absorbing tower (5), described
The lower section of desulfuration absorbing tower (5) is extended to lime stock tank (10) by second pipe (14), new in the lime stock tank (10)
Fresh slurries enter after desulfuration absorbing tower (5) reaction through serum recycle pump group (7) circular treatment by connecting with desulfuration absorbing tower (5)
After enter back into desulfuration absorbing tower (5) reaction, the bottom of the desulfuration absorbing tower (5) extends to stone by Separation of gypsum branch (15)
Cream filters liquid pool (12), it is characterised in that: the side of the desulfuration absorbing tower (5) also passes through pipeline and is connected with frequency conversion oxidation fan
(3), it is provided with freq uency conversion supercharging blower (2) on the first pipe (13), it is fresh to be provided with frequency conversion on the second pipe (14)
Slurries pump (4), are provided with Separation of gypsum branch electric control valve (6) and Separation of gypsum water pump on the Separation of gypsum branch (15)
(11)。
2. a kind of wet desulphurization device according to claim 1, it is characterised in that: in the serum recycle pump group (7) extremely
Contain three water pumps less, any water pump is variable frequency pump, and other is common water pump.
3. a kind of wet desulphurization device according to claim 1, it is characterised in that: be provided at the gas inlet (17)
SO2Concentration detection apparatus and flue gas flow meter.
4. a kind of wet desulphurization device according to claim 1, it is characterised in that: be provided with and draw on the main pipeline (16)
Blower (9)；The boiler is connect by main pipeline (16) with chimney (8)；The chimney (8) is also connected with desulfuration absorbing tower (5)
Top, absorb from desulfuration absorbing tower (5) discharge flue gas.
5. a kind of intelligent control method of wet desulphurization device, the control system of described device include and variable frequency pump, frequency conversion wind
Machine, separate branch electric control valve (6) two-way communication link distributed AC servo system server, the distributed AC servo system server with
Optimal controller also realizes two-way communication, it is characterised in that includes the following steps:
Rate-determining steps A, SO2The SO that gas inlet (17) position detection of concentration detection apparatus in desulfuration absorbing tower (5) arrives2Concentration
For a, the flue gas flow that gas inlet (17) position detection of flue gas flow meter in desulfuration absorbing tower (5) arrives is b, boiler (1)
Load flue gas flow is c, and the distributed AC servo system server controls parameter a and b real-time delivery to optimal controller, the optimization
Device processed makes optimal control order according to control logic A, and optimal control order is transferred to distributed AC servo system server, described
Distributed AC servo system server opens or closes the common water pump in the serum recycle pump group (7)；
Rate-determining steps B, when the amplitude that flue gas flow that flue gas flow meter detects reduces is more than 10%, optimal controller according to
Control logic B makes optimization order, and the control logic B includes that the flow of adjusting fresh limestone slurries is d, prolongs by 10s
The slow time, distributed AC servo system server controls to adjust in proportion respectively again reduces freq uency conversion supercharging blower (2), frequency conversion oxidation fan
(3) and frequency conversion fresh limestone slurries pump (4) load；
Solids concentration parameter information is transferred to distributed AC servo system server by rate-determining steps C, solid concentration sensor, distributed
Parameter information optimal controller, optimal controller are made optimization order according to control logic C by control server；
Rate-determining steps D, distributed AC servo system server is in real time by the air output L1 of boiler (1), fuel mass wear rate W1 (unit
Kg/s), sulphur, carbon, hydrogen, oxygen, nitrogen mass fraction are respectively S in fuela、Ca、Ha、Oa、NaThe monitoring data of (unit %) pass
It is handed to optimal controller, obtains boiler air-supply volume L1 (unit m by following calculation formula3) under, desulfurization will be entered after burning and will be inhaled
Receive exhaust gas volumn V1 (the unit m per second of tower3):
V1=(1.867Ca+11.2Ha+0.7Sa+0.8Na+(1-0.21/α)L1)W1；
Wherein α=(0.0889 (Ca+0.375Sa)+0.265Ha-0.033Oa)/L1；
SO in flue gas at this time is obtained by following calculation formula2Concentration P (units/kg/Nm3):
P=3.33Sa*W1/V1；
Wherein V1 is real-time fuel consumption rate, and V1 is the exhaust gas volumn being calculated according to coal data；
After the optimal controller obtains the data of P, V, according to rate-determining steps B before the flue gas of variation reaches desulfurizing tower, mention
Preceding flow d (the unit m for starting to adjust lime stone slurry3/s)。
6. a kind of intelligent control method of wet desulphurization device according to claim 5, it is characterised in that: the control step
Suddenly the control logic A in A includes the following:
(1) as a*b < 0.7*e*c, 1/4 of water pump total quantity in loop slurry pump group is closed；
(2) as a*b < 0.45*e*c, the 1/2 of circulation slurry pump total quantity is closed；
(3) as a*b < 0.2*e*c, the 3/4 of circulation slurry pump total quantity is closed；
(4) as a*b > 0.7*e*c, the 1/4 of circulation slurry pump total quantity is opened；
(5) as a*b > 0.45*e*c, the 1/2 of circulation slurry pump total quantity is opened；
(6) as a*b > 0.2*e*c, the 3/4 of circulation slurry pump total quantity is opened；
Wherein a is the flue gas SO that gas inlet (17) position detection of sensor in desulfuration absorbing tower (5) arrives2Concentration, b are flue gas
The flue gas flow that gas inlet (17) position detection of flowmeter in desulfuration absorbing tower (5) arrives, c are under boiler (1) Design cooling load
Flue gas flow, e are combustion product gases SO under boiler (1) design coal sulphur content2Concentration.
7. a kind of intelligent control method of wet desulphurization device according to claim 5, it is characterised in that: the meter of the d
Calculate formula are as follows:
D=(- 0.0000002*a2*b2+0.0051*a*b-0.1312)*0.25
Wherein a is the flue gas SO that gas inlet (17) position detection of sensor in desulfuration absorbing tower (5) arrives2Concentration, unit are
mg/Nm3, b is the flue gas flow that gas inlet (17) position detection of flue gas flow meter in desulfuration absorbing tower (5) arrives, and unit is
Nm3。
8. a kind of intelligent control method of wet desulphurization device according to claim 5, it is characterised in that: the control step
Suddenly the control logic C in C includes the following:
(1) when solid concentration sensor detects that the loop slurry solid volume concentration percentage in gypsum filtering liquid pool (12) exists
When in 13%~15% range, distributed AC servo system server adjusts the aperture for increasing Separation of gypsum branch electric control valve (6), and
Flow is increased to 110% of flow before separation branch electric control valve (6) is adjusted, flow is I at this time；
(2) when solid concentration sensor detects that the loop slurry solid volume concentration percentage in gypsum filtering liquid pool (12) exists
When in 15%~17% range, distributed AC servo system server adjusts the aperture for increasing Separation of gypsum branch electric control valve (6), and
Flow is increased to the 110% of flow I；Flow is II at this time；
(3) when solid concentration sensor detects that the loop slurry solid volume concentration percentage in gypsum filtering liquid pool (12) is super
When 17%, distributed AC servo system server adjusts the aperture for increasing Separation of gypsum branch electric control valve (6), and flow is increased
To the 115% of flow II；Flow is III at this time；
(4) when solid concentration sensor detects the loop slurry solid volume concentration percentage drop in gypsum filtering liquid pool (12)
When as low as in 15%~17% range, distributed AC servo system server, which is adjusted, reduces opening for Separation of gypsum branch electric control valve (6)
Degree, and flow is reduced to the 87% of flow III；Flow is IV at this time；
(5) when solid concentration sensor detects the loop slurry solid volume concentration percentage drop in gypsum filtering liquid pool (12)
When as low as within 13~15% ranges, distributed AC servo system server, which is adjusted, reduces opening for Separation of gypsum branch electric control valve (6)
Degree, and flow is reduced to the 90.9% of flow IV；Flow is V at this time；
(6) when solid concentration sensor detects the loop slurry solid volume concentration percentage drop in gypsum filtering liquid pool (12)
When as low as 13% or less, distributed AC servo system server adjusts the aperture for reducing Separation of gypsum branch electric control valve (6), and will stream
Amount is reduced to the 90.9% of flow V.
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| CN110090534A (en) * | 2019-04-03 | 2019-08-06 | 红云红河烟草(集团)有限责任公司 | Control and detection method for desulfurizer |
| CN110090535A (en) * | 2019-04-03 | 2019-08-06 | 红云红河烟草(集团)有限责任公司 | Automatic desulfurizer feeding system |
| CN110756036A (en) * | 2019-11-29 | 2020-02-07 | 苏州仕净环保科技股份有限公司 | Thermal power plant flue gas wet desulphurization system with multi-parameter monitoring function |
| CN111545023A (en) * | 2020-06-18 | 2020-08-18 | 河北化工医药职业技术学院 | Intelligent optimization system for limestone-gypsum wet flue gas desulfurization |
| CN112506162A (en) * | 2020-08-18 | 2021-03-16 | 北京国电龙源环保工程有限公司 | Oxidation air system control method based on data model and mechanism operation |
| CN114749007A (en) * | 2022-04-20 | 2022-07-15 | 保定正德电力技术有限公司 | Automatic control system for wet flue gas desulfurization |
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| CN110090534A (en) * | 2019-04-03 | 2019-08-06 | 红云红河烟草(集团)有限责任公司 | Control and detection method for desulfurizer |
| CN110090535A (en) * | 2019-04-03 | 2019-08-06 | 红云红河烟草(集团)有限责任公司 | Automatic desulfurizer feeding system |
| CN110756036A (en) * | 2019-11-29 | 2020-02-07 | 苏州仕净环保科技股份有限公司 | Thermal power plant flue gas wet desulphurization system with multi-parameter monitoring function |
| CN110756036B (en) * | 2019-11-29 | 2024-02-06 | 苏州仕净科技股份有限公司 | Thermal power plant flue gas wet desulfurization system with multi-parameter monitoring function |
| CN111545023A (en) * | 2020-06-18 | 2020-08-18 | 河北化工医药职业技术学院 | Intelligent optimization system for limestone-gypsum wet flue gas desulfurization |
| CN111545023B (en) * | 2020-06-18 | 2022-04-01 | 河北化工医药职业技术学院 | Intelligent optimization system for limestone-gypsum wet flue gas desulfurization |
| CN112506162A (en) * | 2020-08-18 | 2021-03-16 | 北京国电龙源环保工程有限公司 | Oxidation air system control method based on data model and mechanism operation |
| CN112506162B (en) * | 2020-08-18 | 2022-03-15 | 国能龙源环保有限公司 | Oxidation air system control method based on data model and mechanism operation |
| CN114749007A (en) * | 2022-04-20 | 2022-07-15 | 保定正德电力技术有限公司 | Automatic control system for wet flue gas desulfurization |
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