CN106731829A - Suppress control system and method for the purging on thermal power plant's discharged nitrous oxides influence - Google Patents
Suppress control system and method for the purging on thermal power plant's discharged nitrous oxides influence Download PDFInfo
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- 238000010926 purge Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 28
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 title claims abstract description 19
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 121
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 63
- 238000005507 spraying Methods 0.000 claims abstract description 37
- 239000007789 gas Substances 0.000 claims abstract description 18
- 239000007921 spray Substances 0.000 claims abstract description 13
- 230000008859 change Effects 0.000 claims abstract description 5
- 230000010354 integration Effects 0.000 claims description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 10
- 239000003546 flue gas Substances 0.000 claims description 10
- 230000014759 maintenance of location Effects 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 6
- 238000000205 computational method Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000033228 biological regulation Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 23
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000007405 data analysis Methods 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
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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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
-
- 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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- 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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- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention belongs to Emission Controlling Technology of Nitric Oxides field, it is related to a kind of control system and method for suppressing purging to thermal power plant's discharged nitrous oxides influence.The control system includes the SCR reactors, DCS exhaust gas volumns dynamic detector, the NO that are sequentially connectedxChange in concentration amount computing module, differential integrate module, ammonia spraying amount computing module and spray ammonia controller, SCR reactors and NOxPurging status signal monitor is provided between change in concentration amount computing module, DCS exhaust gas volumns dynamic detector and differential are provided with the first time delay module between integrating module.Methods described integrates NO of the module to the side entrance of A, B two of SCR reactors by differentialxConcentration is integrated respectively, when A side entrances are purged, by the NO of B side entrancesxChange in concentration amount is added to A sides；When B side entrances are purged, by the NO of A side entrancesxChange in concentration amount is added to B sides.The present invention can be prevented effectively when purging is acted because of NOxThe inaccurate nitrogen oxides for causing of measurement is raised, the escaping of ammonia problem.
Description
Technical field
The invention belongs to Emission Controlling Technology of Nitric Oxides field, and in particular to one kind suppresses purging to thermal power plant's nitrogen oxidation
The control system and method for thing discharge influence.
Background technology
Thermal power plant is one of main source of discharged nitrous oxides, and nitrogen oxides is the basis to form nitric acid type acid rain, tool
There is very strong toxicity, the destructiveness to health and ecological environment is very big.At present, denitrating flue gas are most important nitrogen oxides
Administering method.General denitration control system measures the NO of actual exhaust gas volumn, smoke inlet and outlet firstxContent etc.,
Then the ammonia spraying amount of needs is calculated in conjunction with denitration efficiency set in advance, the ammonia spraying amount for calculating is carried out with actual ammonia flow
As the control instruction of spray ammonia regulating valve after comparing, suitable ammonia flow is maintained with rational valve opening.Existing SCR
(Selective Catalytic Reduction, selective catalytic reduction) denitration technology is used mostly NOx(nitrogen oxides)
Analyzer is used as measurement NOxInstrument, but NOxAnalyzer probably carries out once purging action for every four hours.When purging is acted
NOxAnalyzer can be considered attonity, i.e., into " blind area ", cannot now measure NOxContent, cause the whole denitrating system can not
Precise control ammonia spraying amount, causes to spray the problems such as ammonia is very few to cause amount of nitrogen oxides to raise, and spray ammonia excessively causes the escaping of ammonia.
The content of the invention
The purpose of the present invention is directed to the deficiencies in the prior art, there is provided one kind can be prevented effectively when purging is acted because of NOx
The inaccurate nitrogen oxides for causing of measurement is raised, control of the suppression purging of the escaping of ammonia problem on thermal power plant's discharged nitrous oxides influence
System and method processed.
The technical scheme of solve problem of the present invention is：A kind of purging that suppresses is provided on thermal power plant's discharged nitrous oxides influence
Control system, including the SCR (Selective Catalytic Reduction, selective catalytic reduction) being sequentially connected is anti-
Answer device, DCS (Distributed Control System, dcs) exhaust gas volumn dynamic detector, NOxConcentration becomes
Change amount computing module, differential integrate module, ammonia spraying amount computing module and spray ammonia controller, the SCR reactors and NOxConcentration becomes
Purging status signal monitor is provided between change amount computing module, the DCS exhaust gas volumns dynamic detector and differential integrate module
Between be provided with the first time delay module, the SCR reactors have A side entrances and B side entrances.
Further, first time delay module and differential are provided with the secondary module of limit between integrating module.
Further, the NOxChange in concentration amount computing module includes the first choice module and the subtraction mould that are connected with each other
Block, the first choice module is connected with purging status signal monitor and DCS exhaust gas volumn dynamic detectors respectively, the subtraction
Module is integrated module and is connected with differential.
Further, it is provided with the second time delay module between the first choice module and DCS exhaust gas volumn dynamic detectors.
Further, the differential integrates module includes the addition module and the second selecting module that are connected with each other, described to add
Method module and NOxChange in concentration amount computing module be connected, second selecting module respectively with the first time delay module and ammonia spraying amount
Computing module is connected.
Suppress control method of the purging on thermal power plant's discharged nitrous oxides influence, comprise the following steps：
Step 1：When the A side entrances and B side entrances of SCR reactors act without purging, the second time delay module is to DCS cigarettes
The A side entrances of the SCR reactors of tolerance dynamic detector detection and the NO of B side entrancesxConcentration measured value is filtered place respectively
Reason, first choice module is respectively by the A side entrances of filtered SCR reactors and the NO of B side entrancesxConcentration measured value is used as defeated
Enter amount, respectively obtain the NO of A side entrances before purgingxThe NO of B side entrances before concentration retention value and purgingxConcentration retention value；
Step 2：Start purge operations, A side entrances or B side entrances to SCR reactors purge, now first choice
SCR reactors are had module the filtered NO of a side entrance of purging actionxConcentration measured value as input quantity, then subtraction
The filtered NO of modulexConcentration measured value subtracts the NO of corresponding side entrance before purgingxConcentration keeps being worth to corresponding side entrance
NOxChange in concentration amount；
Step 3：Differential integrates module to the A side entrances of SCR reactors and the NO of B side entrancesxConcentration is integrated respectively,
When A side entrances are purged, by the NO of B side entrancesxChange in concentration amount is added to A sides；When B side entrances are purged, by A sides
The NO of entrancexChange in concentration amount is added to B sides；
Step 4：The NO of the A side entrances of the SCR reactors after the integration that step 3 is obtainedxConcentration is added to A as feedforward
During the ammonia spraying amount of side entrance is calculated, the NO of the B side entrances of the SCR reactors after the integration that step 3 is obtainedxConcentration is used as feedforward
Be added to during the ammonia spraying amount of B side entrances calculates, and according to unit load ammonia spraying amount be modified respectively, spray ammonia controller according to
Revised ammonia spraying amount regulation spray ammonia valve opening.
Further, in the step 3：
To the NO of the A side entrances of SCR reactorsxThe method that concentration is integrated is：Do not have in the A side entrances of SCR reactors
When having purging to act, the second selecting module selects the filtered NO in A side entrances of SCR reactorsxMeasured value is used as input quantity；
When the A side entrances of SCR reactors have purging to act, the second selecting module selects the A side entrances NO of SCR reactorsxConcentration keeps
Value and B side entrances NOxChange in concentration amount sum obtains the A side entrances NO of SCR reactors as input quantityxConcentration integration value；
To the NO of the B side entrances of SCR reactorsxThe method that concentration is integrated is：Do not have in the B side entrances of SCR reactors
When having purging to act, the second selecting module selects the filtered NO in B side entrances of SCR reactorsxMeasured value is used as input quantity；
When the B side entrances of SCR reactors have purging to act, the second selecting module selects the B side entrances NO of SCR reactorsxConcentration keeps
Value and A side entrances NOxChange in concentration amount sum obtains the B side entrances NO of SCR reactors as input quantityxConcentration integration value.
Further, the calculating in the step 4 to the ammonia spraying amount of A side entrances comprises the following steps：
4.1, the flue gas flow V of the A side entrances of SCR reactors is calculated, computing formula is：
Wherein, W is the flue gas total blast volume for being passed through SCR reactors, and the unit of W is t/h, and t/h represents ton hour；
4.2, the NO in the flue gas flow V of the A side entrances for calculating SCR reactorsxMass flowComputing formula is：
Wherein, C1Represent the NO after the A side entrances integration of SCR reactorsxConcentration, C2Represent the outlet NO of SCR reactorsx
Concentration set point；
4.3, calculate the mass flow of ammoniaComputing formula is：
4.4, ammonia spraying amount is modified, correction formula is：
Wherein,Revised ammonia spraying amount is represented, F (x) is polygronal function, and x represents unit load, the output of F (x)
Value draws according to the data analysis of live unit load,
To the computational methods phase of the computational methods of the ammonia spraying amount of the B side entrances of SCR reactors and the ammonia spraying amount to A side entrances
Together.
Further, in the step 4.3, the mass flow of ammoniaAlso volume flow can be converted toConversion
Formula is：
Beneficial effects of the present invention are：
1st, control system of the present invention and method overcome NO in prior art denitration control strategyxAnalyzer is in purging
During measure inaccurate, easily cause maloperation cause nitrogen oxide emission raise, the defect of the escaping of ammonia, it is of the present invention
Control method can effectively suppress influence of the purging to thermal power plant's discharged nitrous oxides；
2nd, the purging that suppresses of the present invention can be in thermal power plant on the control method of thermal power plant's discharged nitrous oxides influence
Realize that the control system is in certain power plant #1, #2 unit by configuration mode in all kinds of scattered control systems (DCS)
Successful utilization on (660MW)；
3rd, after using technology of the invention, in purge operations, exhanst gas outlet nitrogen oxides, the escaping of ammonia rate are without obvious
Mutation, effectively inhibits a series of influences caused by purge operations, reduces the discharge of pollutant.
Brief description of the drawings
Fig. 1 is the structural representation frame for suppressing the control system that purging influences on thermal power plant's discharged nitrous oxides of the present invention
Figure；
Fig. 2 is the NO to the A side entrances of SCR reactors using control method of the present inventionxThe side that concentration is integrated
Method schematic flow sheet；
Fig. 3 is the NO to the B side entrances of SCR reactors using control method of the present inventionxThe side that concentration is integrated
Method schematic flow sheet.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment, the present invention is further illustrated.
As shown in figure 1, a kind of control system for suppressing purging to thermal power plant's discharged nitrous oxides influence, including be sequentially connected
SCR reactors, DCS exhaust gas volumns dynamic detector, NOxChange in concentration amount computing module, differential are integrated module, ammonia spraying amount and are calculated
Module and spray ammonia controller, the SCR reactors and NOxPurging status signal monitoring is provided between change in concentration amount computing module
Device, the DCS exhaust gas volumns dynamic detector and differential are provided with the first time delay module, the SCR reaction utensils between integrating module
There are A side entrances and B side entrances.
First time delay module and differential are provided with the secondary module of limit between integrating module.
The NOxChange in concentration amount computing module includes the first choice module and subtraction block that are connected with each other, described the
One selecting module is connected with purging status signal monitor and DCS exhaust gas volumn dynamic detectors respectively, the subtraction block and micro-
Integration module is divided to be connected.
The second time delay module is provided between the first choice module and DCS exhaust gas volumn dynamic detectors.
The differential integrates module includes the addition module and the second selecting module that are connected with each other, the addition module with
NOxChange in concentration amount computing module be connected, second selecting module respectively with the first time delay module and ammonia spraying amount computing module
It is connected.
As shown in Figures 2 and 3, a kind of control method for suppressing purging to thermal power plant's discharged nitrous oxides influence, including such as
Lower step：
Step 1：When the A side entrances and B side entrances of SCR reactors act without purging, the selection of first choice module
Signal is 0, due to two side entrance NOxMeasured value often has disturbance, and the time delay module of inertial element second is used as filtering operation pair
Two side entrance NOxMeasured value is filtered treatment, the SCR reactions that the second time delay module is detected to DCS exhaust gas volumns dynamic detector
The A side entrances of device and the NO of B side entrancesxConcentration measured value is filtered treatment respectively, after first choice module will be filtered respectively
SCR reactors A side entrances and the NO of B side entrancesxConcentration measured value respectively obtains A side entrances before purging as input quantity
NOxThe NO of B side entrances before concentration retention value and purgingxConcentration retention value；
Step 2：Start purge operations, A side entrances or B side entrances to SCR reactors purge, i.e. SCR reactors
A side entrances purging signal and B side entrances purging signal by after one or computing module again with first choice module phase
Even, now the selection signal of first choice module is purged for 1, Fig. 2 is represented to the A side entrances of SCR reactors, and Fig. 3 is represented
B side entrances to SCR reactors are purged, and now SCR reactors are had first choice module a side entrance of purging action
Filtered NOxConcentration measured value as input quantity, the then filtered NO of subtraction blockxConcentration measured value subtracts purging
The NO of preceding corresponding side entrancexConcentration keeps being worth to the NO of corresponding side entrancexChange in concentration amount；
Step 3：Differential integrates module to the A side entrances of SCR reactors and the NO of B side entrancesxConcentration is integrated respectively,
When A side entrances are purged, by the NO of B side entrancesxChange in concentration amount is added to A sides；When B side entrances are purged, by A sides
The NO of entrancexChange in concentration amount is added to B sides；
As shown in Fig. 2 the NO of the A side entrances to SCR reactorsxThe method that concentration is integrated is：In SCR reactors
When A side entrances do not purge action, the selection signal of the second selecting module is 0, and the second selecting module selects the A of SCR reactors
The filtered NO in side entrancexMeasured value is used as input quantity；When the A side entrances of SCR reactors have purging to act, the second selection mould
The selection signal of block is 1, and the second selecting module selects the A side entrances NO of SCR reactorsxConcentration retention value and B side entrances NOxIt is dense
Degree variable quantity sum obtains the A side entrances NO of SCR reactors as input quantityxConcentration integration value；
As shown in figure 3, the NO of the B side entrances to SCR reactorsxThe method that concentration is integrated is：In SCR reactors
When B side entrances do not purge action, the selection signal of the second selecting module is 1, and the second selecting module selects the B of SCR reactors
The filtered NO in side entrancexMeasured value is used as input quantity；When the B side entrances of SCR reactors have purging to act, the second selection mould
The selection signal of block is 1, and the second selecting module selects the B side entrances NO of SCR reactorsxConcentration retention value and A side entrances NOxIt is dense
Degree variable quantity sum obtains the B side entrances NO of SCR reactors as input quantityxConcentration integration value.
Step 4：The NO of the A side entrances of the SCR reactors after the integration that step 3 is obtainedxConcentration is added to A as feedforward
During the ammonia spraying amount of side entrance is calculated, the NO of the B side entrances of the SCR reactors after the integration that step 3 is obtainedxConcentration is used as feedforward
Be added to during the ammonia spraying amount of B side entrances calculates, and according to unit load ammonia spraying amount be modified respectively, spray ammonia controller according to
Revised ammonia spraying amount regulation spray ammonia valve opening.
Calculating in the step 4 to the ammonia spraying amount of A side entrances comprises the following steps：
4.1, the flue gas flow V of the A side entrances of SCR reactors is calculated, computing formula is：
Wherein, W is the flue gas total blast volume for being passed through SCR reactors, and the unit of W is t/h, and t/h represents ton hour；
4.2, the NO in the flue gas flow V of the A side entrances for calculating SCR reactorsxMass flowComputing formula is：
Wherein, C1Represent the NO after the A side entrances integration of SCR reactorsxConcentration, C2Represent the outlet NO of SCR reactorsx
Concentration set point；
4.3, calculate the mass flow of ammoniaComputing formula is：
4.4, ammonia spraying amount is modified, correction formula is：
Wherein,Revised ammonia spraying amount is represented, F (x) is polygronal function, and x represents unit load, the output of F (x)
Value draws according to the data analysis of live unit load,
To the computational methods phase of the computational methods of the ammonia spraying amount of the B side entrances of SCR reactors and the ammonia spraying amount to A side entrances
Together.
In the step 4.3, the mass flow of ammoniaAlso volume flow can be converted toConversion formula is：
The present invention is not limited to above-mentioned implementation method, in the case of without departing substantially from substance of the present invention, art technology
Any deformation that personnel are contemplated that, improvement, replacement each fall within protection scope of the present invention.
Claims (9)
1. control system of the purging on thermal power plant's discharged nitrous oxides influence is suppressed, it is characterised in that including the SCR being sequentially connected
Reactor, DCS exhaust gas volumns dynamic detector, NOxChange in concentration amount computing module, differential integrate module, ammonia spraying amount computing module
With spray ammonia controller, the SCR reactors and NOxPurging status signal monitor is provided between change in concentration amount computing module,
The DCS exhaust gas volumns dynamic detector and differential are provided with the first time delay module between integrating module, and the SCR reactors have A
Side entrance and B side entrances.
2. according to claim 1 to suppress the control system that purging influences on thermal power plant's discharged nitrous oxides, its feature exists
The secondary module of limit is provided between, first time delay module and differential integrate module.
3. according to claim 1 to suppress the control system that purging influences on thermal power plant's discharged nitrous oxides, its feature exists
In the NOxChange in concentration amount computing module includes the first choice module and subtraction block that are connected with each other, the first choice
Module is connected with purging status signal monitor and DCS exhaust gas volumn dynamic detectors respectively, and the subtraction block and differential are integrated
Module is connected.
4. according to claim 3 to suppress the control system that purging influences on thermal power plant's discharged nitrous oxides, its feature exists
In being provided with the second time delay module between the first choice module and DCS exhaust gas volumn dynamic detectors.
5. according to claim 1 to suppress the control system that purging influences on thermal power plant's discharged nitrous oxides, its feature exists
In the differential integrates module includes the addition module and the second selecting module, the addition module and NO that are connected with each otherxConcentration
Variable quantity computing module is connected, and second selecting module is connected with the first time delay module and ammonia spraying amount computing module respectively.
6. control method of the purging on thermal power plant's discharged nitrous oxides influence is suppressed, it is characterised in that comprised the following steps：
Step 1：When the A side entrances and B side entrances of SCR reactors act without purging, the second time delay module is to DCS exhaust gas volumns
The A side entrances of the SCR reactors of dynamic detector detection and the NO of B side entrancesxConcentration measured value is filtered treatment respectively, the
One selecting module is respectively by the A side entrances of filtered SCR reactors and the NO of B side entrancesxConcentration measured value as input quantity,
Respectively obtain the NO of the preceding A side entrances of purgingxThe NO of B side entrances before concentration retention value and purgingxConcentration retention value；
Step 2：Start purge operations, A side entrances or B side entrances to SCR reactors purge, first choice module will
SCR reactors have the filtered NO of a side entrance of purging actionxConcentration measured value is used as input quantity, then subtraction block
Filtered NOxConcentration measured value subtracts the NO of corresponding side entrance before purgingxConcentration keeps being worth to the NO of corresponding side entrancexIt is dense
Degree variable quantity；
Step 3：Differential integrates module to the A side entrances of SCR reactors and the NO of B side entrancesxConcentration is integrated respectively, in A sides
When entrance is purged, by the NO of B side entrancesxChange in concentration amount is added to A sides；When B side entrances are purged, by A side entrances
NOxChange in concentration amount is added to B sides；
Step 4：The NO of the A side entrances of the SCR reactors after the integration that step 3 is obtainedxConcentration is added to A sides and enters as feedforward
During the ammonia spraying amount of mouth is calculated, the NO of the B side entrances of the SCR reactors after the integration that step 3 is obtainedxConcentration is added as feedforward
Ammonia spraying amount to B side entrances is calculated, and according to unit load ammonia spraying amount is modified respectively, and spray ammonia controller is according to amendment
Ammonia spraying amount regulation spray ammonia valve opening afterwards.
7. control method according to claim 6, it is characterised in that in the step 3：
To the NO of the A side entrances of SCR reactorsxThe method that concentration is integrated is：Do not purged in the A side entrances of SCR reactors
During action, the second selecting module selects the filtered NO in A side entrances of SCR reactorsxMeasured value is used as input quantity；It is anti-in SCR
When answering the A side entrances of device and having purging to act, the second selecting module selects the A side entrances NO of SCR reactorsxConcentration retention value and B
Side entrance NOxChange in concentration amount sum obtains the A side entrances NO of SCR reactors as input quantityxConcentration integration value；
To the NO of the B side entrances of SCR reactorsxThe method that concentration is integrated is：Do not purged in the B side entrances of SCR reactors
During action, the second selecting module selects the filtered NO in B side entrances of SCR reactorsxMeasured value is used as input quantity；It is anti-in SCR
When answering the B side entrances of device and having purging to act, the second selecting module selects the B side entrances NO of SCR reactorsxConcentration retention value and A
Side entrance NOxChange in concentration amount sum obtains the B side entrances NO of SCR reactors as input quantityxConcentration integration value.
8. control method according to claim 6, it is characterised in that to the meter of the ammonia spraying amount of A side entrances in the step 4
Comprise the following steps：
4.1, the flue gas flow V of the A side entrances of SCR reactors is calculated, computing formula is：
Wherein, W is the flue gas total blast volume for being passed through SCR reactors, and the unit of W is t/h, and t/h represents ton hour；
4.2, the NO in the flue gas flow V of the A side entrances for calculating SCR reactorsxMass flowComputing formula is：
Wherein, C1Represent the NO after the A side entrances integration of SCR reactorsxConcentration, C2Represent the outlet NO of SCR reactorsxConcentration sets
Definite value；
4.3, calculate the mass flow of ammoniaComputing formula is：
4.4, ammonia spraying amount is modified, correction formula is：
Wherein,Revised ammonia spraying amount is represented, F (x) is polygronal function, and x represents unit load；
Computational methods to the ammonia spraying amount of the B side entrances of SCR reactors are identical with the computational methods of the ammonia spraying amount to A side entrances.
9. control method according to claim 8, it is characterised in that in the step 4.3, the mass flow of ammonia
Also volume flow can be converted toConversion formula is：
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710206680.6A CN106731829A (en) | 2017-03-31 | 2017-03-31 | Suppress control system and method for the purging on thermal power plant's discharged nitrous oxides influence |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710206680.6A CN106731829A (en) | 2017-03-31 | 2017-03-31 | Suppress control system and method for the purging on thermal power plant's discharged nitrous oxides influence |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107803114A (en) * | 2017-12-04 | 2018-03-16 | 烟台龙源电力技术股份有限公司 | A kind of denitration control system and its control method and control device |
| CN108905554A (en) * | 2018-06-21 | 2018-11-30 | 华能国际电力股份有限公司 | A kind of minimum continuous spray ammonia temperature online real-time predicting method of SCR flue gas denitrification equipment |
| CN108970394A (en) * | 2018-07-23 | 2018-12-11 | 北京能源集团有限责任公司 | A kind of thermal power plant's SCR system optimization spray ammonia method and system |
| CN109140493A (en) * | 2018-08-28 | 2019-01-04 | 苏州工业园区蓝天燃气热电有限公司 | A method of reducing the GE combustion engine firing optimization of combustion pulsation and exhaust emission |
| CN112221323A (en) * | 2020-08-11 | 2021-01-15 | 华电电力科学研究院有限公司 | NOx partition measuring method based on flow velocity weighting |
| CN113433980A (en) * | 2021-04-27 | 2021-09-24 | 国能南京电力试验研究有限公司 | Calculating denitration inlet NO under blowing working condition by system error methodxMethod for measuring values |
| CN114859841A (en) * | 2022-05-16 | 2022-08-05 | 西安热工研究院有限公司 | Thermal power plant NOx emission monitoring control system and method |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050282285A1 (en) * | 2004-06-21 | 2005-12-22 | Eaton Corporation | Strategy for controlling NOx emissions and ammonia slip in an SCR system using a nonselective NOx/NH3 |
| CN105148727A (en) * | 2015-10-10 | 2015-12-16 | 广东电网有限责任公司电力科学研究院 | Denitration optimal control method and system for coal-fired power generation unit |
| CN105797576A (en) * | 2016-04-15 | 2016-07-27 | 中国大唐集团科学技术研究院有限公司西北分公司 | Coal-fired unit denitration ammonia spraying control method |
| CN105892504A (en) * | 2015-07-30 | 2016-08-24 | 大唐环境产业集团股份有限公司 | Thermal power plant denitration ammonia supplying automatic return circuit control method and system |
| CN105944568A (en) * | 2016-06-24 | 2016-09-21 | 国投钦州发电有限公司 | Multi-point sampling and measurement system for exhaust smoke from inlet and outlet of denitration CEMS of thermal power plant |
| CN105975789A (en) * | 2016-05-18 | 2016-09-28 | 华北电力大学（保定） | Ammonia-escaping-rate online obtaining method for desulfurization and denitrification control |
| CN105983302A (en) * | 2016-05-31 | 2016-10-05 | 邢红涛 | Component detection and ammonia spraying control system of SCR denitrification process |
| CN205861653U (en) * | 2016-07-19 | 2017-01-04 | 南京博沃科技发展有限公司 | A kind of distributed tour gauging system of SCR exit NOx concentration |
| CN106422709A (en) * | 2016-10-24 | 2017-02-22 | 大唐韩城第二发电有限责任公司 | Ammonia spraying regulation automatic control method for denitrification system of thermal power plant |
| CN106512723A (en) * | 2016-12-26 | 2017-03-22 | 大唐黑龙江发电有限公司哈尔滨第热电厂 | Denitration automatic regulating loop device |
| CN206631437U (en) * | 2017-03-31 | 2017-11-14 | 华北电力大学（保定） | Suppress the control system that purging influences on thermal power plant's discharged nitrous oxides |
-
2017
- 2017-03-31 CN CN201710206680.6A patent/CN106731829A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050282285A1 (en) * | 2004-06-21 | 2005-12-22 | Eaton Corporation | Strategy for controlling NOx emissions and ammonia slip in an SCR system using a nonselective NOx/NH3 |
| CN105892504A (en) * | 2015-07-30 | 2016-08-24 | 大唐环境产业集团股份有限公司 | Thermal power plant denitration ammonia supplying automatic return circuit control method and system |
| CN105148727A (en) * | 2015-10-10 | 2015-12-16 | 广东电网有限责任公司电力科学研究院 | Denitration optimal control method and system for coal-fired power generation unit |
| CN105797576A (en) * | 2016-04-15 | 2016-07-27 | 中国大唐集团科学技术研究院有限公司西北分公司 | Coal-fired unit denitration ammonia spraying control method |
| CN105975789A (en) * | 2016-05-18 | 2016-09-28 | 华北电力大学（保定） | Ammonia-escaping-rate online obtaining method for desulfurization and denitrification control |
| CN105983302A (en) * | 2016-05-31 | 2016-10-05 | 邢红涛 | Component detection and ammonia spraying control system of SCR denitrification process |
| CN105944568A (en) * | 2016-06-24 | 2016-09-21 | 国投钦州发电有限公司 | Multi-point sampling and measurement system for exhaust smoke from inlet and outlet of denitration CEMS of thermal power plant |
| CN205861653U (en) * | 2016-07-19 | 2017-01-04 | 南京博沃科技发展有限公司 | A kind of distributed tour gauging system of SCR exit NOx concentration |
| CN106422709A (en) * | 2016-10-24 | 2017-02-22 | 大唐韩城第二发电有限责任公司 | Ammonia spraying regulation automatic control method for denitrification system of thermal power plant |
| CN106512723A (en) * | 2016-12-26 | 2017-03-22 | 大唐黑龙江发电有限公司哈尔滨第热电厂 | Denitration automatic regulating loop device |
| CN206631437U (en) * | 2017-03-31 | 2017-11-14 | 华北电力大学（保定） | Suppress the control system that purging influences on thermal power plant's discharged nitrous oxides |
Non-Patent Citations (2)
| Title |
|---|
| 刘宇鑫等: "SCR烟气脱硝喷氨自动控制分析及优化", 《吉林电力》 * |
| 马立阁: "燃煤电站烟气SCR脱硝控制系统改进", 《发电设备》 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107803114A (en) * | 2017-12-04 | 2018-03-16 | 烟台龙源电力技术股份有限公司 | A kind of denitration control system and its control method and control device |
| CN107803114B (en) * | 2017-12-04 | 2020-06-16 | 烟台龙源电力技术股份有限公司 | Denitration control system and control method and control device thereof |
| CN108905554A (en) * | 2018-06-21 | 2018-11-30 | 华能国际电力股份有限公司 | A kind of minimum continuous spray ammonia temperature online real-time predicting method of SCR flue gas denitrification equipment |
| CN108970394A (en) * | 2018-07-23 | 2018-12-11 | 北京能源集团有限责任公司 | A kind of thermal power plant's SCR system optimization spray ammonia method and system |
| CN108970394B (en) * | 2018-07-23 | 2020-07-10 | 北京能源集团有限责任公司 | Optimized ammonia spraying method and system for SCR system of thermal power plant |
| CN109140493A (en) * | 2018-08-28 | 2019-01-04 | 苏州工业园区蓝天燃气热电有限公司 | A method of reducing the GE combustion engine firing optimization of combustion pulsation and exhaust emission |
| CN109140493B (en) * | 2018-08-28 | 2019-11-29 | 苏州工业园区蓝天燃气热电有限公司 | A method of reducing the GE combustion engine firing optimization of combustion pulsation and exhaust emission |
| CN112221323A (en) * | 2020-08-11 | 2021-01-15 | 华电电力科学研究院有限公司 | NOx partition measuring method based on flow velocity weighting |
| CN113433980A (en) * | 2021-04-27 | 2021-09-24 | 国能南京电力试验研究有限公司 | Calculating denitration inlet NO under blowing working condition by system error methodxMethod for measuring values |
| CN114859841A (en) * | 2022-05-16 | 2022-08-05 | 西安热工研究院有限公司 | Thermal power plant NOx emission monitoring control system and method |
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