CN103574580A - Thermal power generating unit NOx discharge monitoring method and system - Google Patents
Thermal power generating unit NOx discharge monitoring method and system Download PDFInfo
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Abstract
The invention discloses a thermal power generating unit NOx discharge monitoring method and system. The method comprises the following steps: boiler operation parameters in a real-time database are read through a database server; correlation coefficients between the boiler operation parameters and boiler efficiency and NOx discharge are calculated through the database server, and boiler operation parameters which accord with conditions of the correlation coefficients are selected; the boiler efficiency and the NOx discharge are calculated by the database server according to the selected boiler operation parameters which accord with the conditions of the correlation coefficients, and the boiler operation parameters which accord with the conditions of the correlation coefficients, the boiler efficiency and the NOx discharge are transmitted to monitoring equipment for monitoring; when the calculated boiler efficiency and the NOx discharge do not accord with conditions, the monitoring equipment adjusts operating parameters of a boiler according to the boiler operation parameters which accord with conditions of the boiler efficiency and the NOx discharge. The thermal power generating unit NOx discharge monitoring method and system can realize real-time monitoring of the boiler operation parameters and optimize the NOx discharge of a thermal power generating unit, thereby reducing operating cost of the thermal power generating unit.
Description
Technical field
The present invention relates to thermal power generation field, particularly, relate to a kind of fired power generating unit NOx exhausting control method and system.
Background technology
In thermal power generation field, the low NOx combusting technology that the boiler of fired power generating unit has all adopted low NOx combusting technology ，Er China to adopt at present substantially at present can be controlled at 600mg/Nm by fired power generating unit economizer exit NOx
3left and right; this concentration of emission does not meet the requirement of national environmental protection cloth < promulgated by the ministries or commissions of the Central Government < fossil-fuel power plant atmospheric pollutant emission standard > >, because < < fossil-fuel power plant atmospheric pollutant emission standard > > requires firepower fired power generating unit to carry out NOx concentration of emission, is less than 100mg/Nm
3standard.
In order to meet the requirement of above-mentioned national standard, for conventional thermal power plant, can realize as below: increase stove outer denitrating system, for example selective catalytic reduction (SCR); Carry out low-NOx combustor (LNB) system reform, make the discharge of improved low-NOx combustor meet national standard; By combustion control, make final NOx concentration of emission meet the requirement of national standard.
For firepower fired power generating unit, the requirement that adopts single LNB technology to be difficult to be up to state standards, therefore need to increase SCR equipment, but in order to make final concentration of emission meet the requirement of national standard, need to optimize the concentration of emission of LNB, thereby the NOx that meets national standard for the normal operation of SCR equipment discharge provides safeguard, but at present to LNB discharge monitor and LNB and SCR coordinated to the implementation of monitoring.
Summary of the invention
The object of this invention is to provide a kind of fired power generating unit NOx exhausting control method and system, to optimize the NOx discharge capacity of fired power generating unit.
To achieve these goals, the invention provides a kind of fired power generating unit NOx exhausting control method, the method comprises: database server reads the boiler operating parameter in real-time data base; Described database server calculates the coefficient correlation between described boiler operating parameter and boiler efficiency and NOx discharge capacity, selects to meet the described boiler operating parameter of coefficient correlation condition; Described database server calculates described boiler efficiency and described NOx discharge capacity according to the selected described boiler operating parameter that meets described coefficient correlation condition, and described database server is sent to watch-dog to monitor by the described described boiler operating parameter that meets coefficient correlation condition and described boiler efficiency and described NOx discharge capacity; In calculated described boiler efficiency and described NOx discharge capacity, when ineligible, described watch-dog is adjusted the operational factor of boiler according to the described boiler operating parameter that meets described boiler efficiency and described NOx discharge capacity condition.
Preferably, described boiler operating parameter comprises boiler load, main steam flow, main steam temperature, main steam pressure, feed temperature, feedwater flow, fuel quantity, air output, pressure fan electric current, air inducing amount, air-introduced machine electric current, pressure fan baffle opening, air-introduced machine baffle opening, exhaust gas temperature, fire box temperature, hot blast temperature, primary air pressure, combustion chamber draft, secondary wind pressure, reheat temperature, desuperheating water of superheater amount, hot spray water flux again, coal pulverizer coal-supplying amount, secondary air damper aperture, primary air flow, coal pulverizer ventilation, enter the total coal amount of stove, and enter in stove total air at least both.
Preferably, the method also comprises: described database server reaches the described boiler operating parameter of rule rejecting abnormalities according to Rye.
Preferably, the coefficient correlation that described database server calculates between described boiler operating parameter and described boiler efficiency and described NOx discharge capacity comprises: described database server calculates coefficient correlation between described boiler operating parameter and described boiler efficiency and the coefficient correlation between described boiler operating parameter and described NOx discharge capacity according to following formula:
Preferably, described database server selects the described boiler operating parameter that meets described coefficient correlation condition to comprise: described database server selects the coefficient correlation between described boiler operating parameter and described boiler efficiency to be greater than the described boiler operating parameter that coefficient correlation between the first preset value and described boiler operating parameter and described NOx discharge capacity is greater than the second preset value.
Preferably, described database server calculates described boiler efficiency according to the selected described boiler operating parameter that meets described coefficient correlation condition and described NOx discharge capacity comprises: described database server builds the neutral net that comprises input layer, hidden layer and output layer; Described database server will meet the node value of the described boiler operating parameter of described coefficient correlation condition as described input layer; Described database server goes out as the described boiler efficiency of output layer node and the value of described NOx discharge capacity by described neural computing.
Preferably, the method also comprises: boiler operating parameter, described boiler efficiency and described NOx discharge capacity described in described database server normalization.
Preferably, the method also comprises: described database server is according to the ammonia consumption of described NOx Emission amount calculation SCR equipment needs.
Preferably, the method also comprises: described database server utilizes NH
3at least one in/NO mol ratio, flue-gas temperature, flue gas flow ratio and the escaping of ammonia rate revised denitration efficiency.
Preferably, the method also comprises: described database server utilizes wet flue gas flow correction ammonia consumption in the CONCENTRATION DISTRIBUTION of NOx in SCR equipment flue and/or SCR equipment flue.
The invention provides a kind of fired power generating unit NOx exhausting control system, this system comprises: real-time data base, for storing boiler operating parameter; Database server, for reading the boiler operating parameter of real-time data base; Calculate the coefficient correlation between described boiler operating parameter and boiler efficiency and NOx discharge capacity, select to meet the described boiler operating parameter of coefficient correlation condition; And calculate described boiler efficiency and described NOx discharge capacity according to the selected described boiler operating parameter that meets described coefficient correlation condition; Watch-dog, for meeting the described boiler operating parameter of coefficient correlation condition and described boiler efficiency and described NOx discharge capacity described in receiving that described database server sends to monitor; In calculated described boiler efficiency and described NOx discharge capacity, when ineligible, according to the described boiler operating parameter that meets described boiler efficiency and described NOx discharge capacity condition, adjust the operational factor of boiler.
Preferably, boiler operating parameter comprises boiler load, main steam flow, main steam temperature, main steam pressure, feed temperature, feedwater flow, fuel quantity, air output, pressure fan electric current, air inducing amount, air-introduced machine electric current, pressure fan baffle opening, air-introduced machine baffle opening, exhaust gas temperature, fire box temperature, hot blast temperature, primary air pressure, combustion chamber draft, secondary wind pressure, reheat temperature, desuperheating water of superheater amount, hot spray water flux again, coal pulverizer coal-supplying amount, secondary air damper aperture, primary air flow, coal pulverizer ventilation, enter the total coal amount of stove, and enter in stove total air at least both.
Preferably, described database server is also for reaching the described boiler operating parameter of rule rejecting abnormalities according to Rye.
Preferably, described database server is for calculating coefficient correlation between described boiler operating parameter and described boiler efficiency and the coefficient correlation between described boiler operating parameter and described NOx discharge capacity according to following formula:
Preferably, described database server is for selecting coefficient correlation between described boiler operating parameter and described boiler efficiency to be greater than the boiler operating parameter that coefficient correlation between the first preset value and described boiler operating parameter and described NOx discharge capacity is greater than the second preset value.
Preferably, described database server is for building the neutral net that comprises input layer, hidden layer and output layer; The node value of the described boiler operating parameter of described coefficient correlation condition as input layer will be met; By described neural computing, go out as the described boiler efficiency of output layer node and the value of described NOx discharge capacity.
Preferably, described database server is for boiler operating parameter, described boiler efficiency and described NOx discharge capacity described in normalization.
Preferably, the ammonia consumption of described database server for needing according to described NOx Emission amount calculation SCR equipment.
Preferably, described database server is used for utilizing NH
3at least one in/NO mol ratio, flue-gas temperature, flue gas flow ratio and the escaping of ammonia rate revised denitration efficiency.
Preferably, described database server is for utilizing wet flue gas flow correction ammonia consumption in the CONCENTRATION DISTRIBUTION of SCR equipment flue NOx and/or SCR equipment flue.
The present invention can realize the real-time monitoring to boiler operating parameter, and can optimize the NOx discharge capacity of fired power generating unit, thereby saves the operating cost of fired power generating unit, reaches the effect that economic benefit combines with social benefit.
Other features and advantages of the present invention partly in detail are described the specific embodiment subsequently.
Accompanying drawing explanation
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for description, is used from explanation the present invention, but is not construed as limiting the invention with the specific embodiment one below.In the accompanying drawings:
Fig. 1 is fired power generating unit NOx exhausting control flow chart provided by the invention;
Fig. 2 is neutral net schematic diagram provided by the invention;
Fig. 3 is fired power generating unit NOx exhausting control system diagram provided by the invention;
Fig. 4 is watch-dog user interface schematic diagram provided by the invention.
Description of reference numerals
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.Should be understood that, the specific embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
In order to realize the monitoring in NOx discharge process, the invention provides and monitor as shown in Figure 1 flow process, specifically comprise: database server reads the boiler operating parameter (step 101) in real-time data base; Described database server calculates the coefficient correlation between described boiler operating parameter and boiler efficiency and NOx discharge capacity, selects to meet the described boiler operating parameter (step 103) of coefficient correlation condition; Described database server calculates described boiler efficiency and described NOx discharge capacity according to the selected described boiler operating parameter that meets described coefficient correlation condition, and described database server is sent to watch-dog to monitor (step 105) by the described described boiler operating parameter that meets coefficient correlation condition and described boiler efficiency and described NOx discharge capacity; In calculated described boiler efficiency and described NOx discharge capacity, when ineligible, described watch-dog is adjusted the operational factor (step 107) of boiler according to the described boiler operating parameter that meets described boiler efficiency and described NOx discharge capacity condition.The so-called described boiler operating parameter that meets described boiler efficiency and described NOx discharge capacity condition refers in boiler operating efficiency and NOx discharge capacity and meets corresponding boiler operating parameter when pre-conditioned herein.In fired power generating unit, boiler operating parameter is very many, for example boiler operating parameter can comprise boiler load, main steam flow, main steam temperature, main steam pressure, feed temperature, feedwater flow, fuel quantity, air output, pressure fan electric current, air inducing amount, air-introduced machine electric current, pressure fan baffle opening, air-introduced machine baffle opening, exhaust gas temperature, fire box temperature, hot blast temperature, primary air pressure, combustion chamber draft, secondary wind pressure, reheat temperature, desuperheating water of superheater amount, hot spray water flux again, coal pulverizer coal-supplying amount, secondary air damper aperture, primary air flow, coal pulverizer ventilation, enter the total coal amount of stove, enter stove total air etc.It should be noted that, the boiler operating parameter of herein enumerating is only made example and is unrestricted, can also comprise other boiler operating parameter.
Because boiler operating parameter is very many, and mainly lay particular emphasis on the balance between boiler efficiency and NOx discharge capacity for the control of NOx discharge capacity, make in the guaranteed situation of boiler efficiency, reduce as best one can NOx discharge capacity.For this reason, need to from many boiler operating parameters, choose available boiler operating parameter.Speed in order to increase the validity of calculating and to accelerate to calculate, can first reach the described boiler operating parameter of rule rejecting abnormalities according to Rye.It should be noted that, the boiler operating parameter of rejecting abnormalities is not that the present invention is necessary, because in the situation that the boiler operating parameter of rejecting abnormalities, the present invention also can be implemented.
In order to calculate the coefficient correlation between boiler operating parameter and described boiler efficiency and described NOx discharge capacity, can use following formula:
ρ wherein
ijfor boiler operating parameter x
iwith boiler efficiency or NOx discharge capacity y
jbetween coefficient correlation,
for boiler operating parameter x
iaverage,
for boiler efficiency or NOx discharge capacity y
javerage, i, j are positive integer.
Through after above-mentioned Calculation of correlation factor, can select coefficient correlation between boiler operating parameter and described boiler efficiency to be greater than the described boiler operating parameter that for example, coefficient correlation between the first preset value (0.3) and described boiler operating parameter and described NOx discharge capacity is greater than the second preset value (0.3).For convenience of calculation, can be normalized selected boiler operating parameter, for example pass through following formula:
After having selected suitable boiler operating parameter, can calculate boiler efficiency and NOx discharge capacity by these boiler operating parameters.When carrying out this calculating, can adopt various ways to realize, the present invention selects neutral net to calculate.Neutral net provided by the invention as shown in Figure 2, comprise input layer, hidden layer and output layer, the node value of input layer is boiler operating parameter, and the node value of output layer is boiler efficiency and NOx discharge capacity, in neutral net, between each node, can have weights.Structure and operation for neutral net can realize by prior art, and the present invention is no longer described in detail.
In order to carry out monitoring NOx discharge capacity, database server can receive and meet the described boiler operating parameter of described coefficient correlation condition and boiler efficiency and described NOx discharge capacity and be sent to watch-dog, and watch-dog shows corresponding data or control accordingly.
By above-mentioned optimal control, can obtain reducing the boiler operating parameter of NOx discharge capacity, when boiler efficiency and described NOx discharge capacity do not meet default condition, then control appliance can be adjusted the boiler operating parameter of low-NOx combustor according to this boiler operating parameter, thereby realizes the optimization of NOx discharge capacity.After being combined with SCR equipment, the NOx of discharge will enter SCR equipment and reduce.When SCR equipment reduces, need to using ammonia as reducing agent, therefore need database server according to the ammonia consumption of described NOx Emission amount calculation SCR equipment needs.Because the CONCENTRATION DISTRIBUTION of NOx in SCR equipment flue is uneven, so database server can be revised by the CONCENTRATION DISTRIBUTION of NOx in SCR equipment flue; The concrete technical scheme of correction liquefied ammonia consumption of the present invention has two, and the one, according to specific reactor situation, the CONCENTRATION DISTRIBUTION field of analog computation NOx, adopts integral and calculating to deviate or modifying factor; Another is by setting up liquefied ammonia stock, consume track database, adopt material balance principle verification liquefied ammonia consumption in real time, guaranteeing that liquefied ammonia consumption is accurate.
Denitration efficiency is one of important indicator of denitrating system performance, and for reaction denitration efficiency exactly, database server can utilize at least one in NH3/NO mol ratio, flue-gas temperature, flue gas flow ratio and the escaping of ammonia rate to denitration efficiency correction.After SCR goes into operation, the main internal cause that affects denitration efficiency is the activated state of catalyst, in view of guaranteeing that effective lifetime (being generally more than 30,000 hours) inner catalyst activity is in a stable attenuation process, it is to gather in real time SCR entrance relevant parameters by acquisition module that the present invention calculates denitration efficiency basic scheme, outlet relevant parameters, and the escaping of ammonia situation, in conjunction with NH3/NO mol ratio, set up molecular balance equation, computational analysis in real time draws catalyst activity sexual state and corresponding denitration efficiency, this efficiency is exactly the best denitration efficiency that SCR is corresponding, to instruct operations staff to adjust in time boiler, and the relevant operational factor of SCR, guarantee that boiler plant is all the time in safety, environmental protection, economical operation state.
Database server can be sent to watch-dog by the above-mentioned ammonia consumption calculating, and control appliance can be controlled according to the ammonia consumption calculating the amount of the ammonia that enters SCR equipment.Similarly, database server can also be sent to watch-dog for monitoring by the above-mentioned denitration efficiency calculating.
Watch-dog provided by the present invention can be the terminal that software is installed, for example computer or work station.By software, can realize user interface as described in Figure 3, on this interface, be provided with many monitoring modulars, boiler efficiency monitoring modular M1 for example, flue gas flow monitoring modular M2, air preheater pressure reduction monitoring modular M3, liquefied ammonia consumption monitoring modular M4, catalyst activity monitoring modular M5, the escaping of ammonia monitoring modular M6, deduster secondary current monitoring modular M7, pressure fan M8, air-introduced machine M9, dilution air M10, flue gas blender M11 etc., if database server sends over relevant data, software can be added up data accordingly, user, click after corresponding monitoring modular, can on screen, by curve or digital mode, show in real time.
Below describe by reference to the accompanying drawings the preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition each the concrete technical characterictic described in the above-mentioned specific embodiment, in reconcilable situation, can combine by any suitable mode.For fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible combinations.
In addition, between various embodiment of the present invention, also can be combined, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (20)
1. a fired power generating unit NOx exhausting control method, is characterized in that, the method comprises:
Database server reads the boiler operating parameter in real-time data base;
Described database server calculates the coefficient correlation between described boiler operating parameter and boiler efficiency and NOx discharge capacity, selects to meet the described boiler operating parameter of coefficient correlation condition;
Described database server calculates described boiler efficiency and described NOx discharge capacity according to the selected described boiler operating parameter that meets described coefficient correlation condition, and described database server is sent to watch-dog to monitor by the described described boiler operating parameter that meets coefficient correlation condition and described boiler efficiency and described NOx discharge capacity;
In calculated described boiler efficiency and described NOx discharge capacity, when ineligible, described watch-dog is adjusted the operational factor of boiler according to the described boiler operating parameter that meets described boiler efficiency and described NOx discharge capacity condition.
2. method according to claim 1, it is characterized in that, described boiler operating parameter comprises boiler load, main steam flow, main steam temperature, main steam pressure, feed temperature, feedwater flow, fuel quantity, air output, pressure fan electric current, air inducing amount, air-introduced machine electric current, pressure fan baffle opening, air-introduced machine baffle opening, exhaust gas temperature, fire box temperature, hot blast temperature, primary air pressure, combustion chamber draft, secondary wind pressure, reheat temperature, desuperheating water of superheater amount, hot spray water flux again, coal pulverizer coal-supplying amount, secondary air damper aperture, primary air flow, coal pulverizer ventilation, enter the total coal amount of stove, and enter in stove total air at least both.
3. method according to claim 1, is characterized in that, the method also comprises:
Described database server reaches the described boiler operating parameter of rule rejecting abnormalities according to Rye.
4. method according to claim 1, is characterized in that, the coefficient correlation that described database server calculates between described boiler operating parameter and described boiler efficiency and described NOx discharge capacity comprises:
Described database server calculates coefficient correlation between described boiler operating parameter and described boiler efficiency and the coefficient correlation between described boiler operating parameter and described NOx discharge capacity according to following formula:
ρ wherein
ijfor boiler operating parameter x
iwith boiler efficiency or NOx discharge capacity y
jbetween coefficient correlation,
for boiler operating parameter x
iaverage,
for boiler efficiency or NOx discharge capacity y
javerage, i, j are positive integer.
5. method according to claim 4, is characterized in that, described database server selects the described boiler operating parameter that meets described coefficient correlation condition to comprise:
Described database server selects the coefficient correlation between described boiler operating parameter and described boiler efficiency to be greater than the described boiler operating parameter that coefficient correlation between the first preset value and described boiler operating parameter and described NOx discharge capacity is greater than the second preset value.
6. method according to claim 4, is characterized in that, described database server calculates described boiler efficiency according to the selected described boiler operating parameter that meets described coefficient correlation condition and described NOx discharge capacity comprises:
Described database server builds the neutral net that comprises input layer, hidden layer and output layer;
Described database server will meet the node value of the described boiler operating parameter of described coefficient correlation condition as described input layer;
Described database server goes out as the described boiler efficiency of output layer node and the value of described NOx discharge capacity by described neural computing.
7. according to the method described in claim 1-6 any one, it is characterized in that, the method also comprises:
Boiler operating parameter, described boiler efficiency and described NOx discharge capacity described in described database server normalization.
8. according to the method described in claim 1-6 any one, it is characterized in that, the method also comprises:
The ammonia consumption that described database server needs according to described NOx Emission amount calculation SCR equipment.
9. method according to claim 8, is characterized in that, the method also comprises:
Described database server utilizes NH
3at least one in/NO mol ratio, flue-gas temperature, flue gas flow ratio and the escaping of ammonia rate revised denitration efficiency.
10. method according to claim 8, is characterized in that, the method also comprises:
Described database server utilizes wet flue gas flow correction ammonia consumption in the CONCENTRATION DISTRIBUTION of NOx in SCR equipment flue and/or SCR equipment flue.
11. 1 kinds of fired power generating unit NOx exhausting control systems, is characterized in that, this system comprises:
Real-time data base, for storing boiler operating parameter;
Database server, for reading the boiler operating parameter of real-time data base; Calculate the coefficient correlation between described boiler operating parameter and boiler efficiency and NOx discharge capacity, select to meet the described boiler operating parameter of coefficient correlation condition; And calculate described boiler efficiency and described NOx discharge capacity according to the selected described boiler operating parameter that meets described coefficient correlation condition;
Watch-dog, for meeting the described boiler operating parameter of coefficient correlation condition and described boiler efficiency and described NOx discharge capacity described in receiving that described database server sends to monitor; In calculated described boiler efficiency and described NOx discharge capacity, when ineligible, according to the described boiler operating parameter that meets described boiler efficiency and described NOx discharge capacity condition, adjust the operational factor of boiler.
12. systems according to claim 11, it is characterized in that, boiler operating parameter comprises boiler load, main steam flow, main steam temperature, main steam pressure, feed temperature, feedwater flow, fuel quantity, air output, pressure fan electric current, air inducing amount, air-introduced machine electric current, pressure fan baffle opening, air-introduced machine baffle opening, exhaust gas temperature, fire box temperature, hot blast temperature, primary air pressure, combustion chamber draft, secondary wind pressure, reheat temperature, desuperheating water of superheater amount, hot spray water flux again, coal pulverizer coal-supplying amount, secondary air damper aperture, primary air flow, coal pulverizer ventilation, enter the total coal amount of stove, and enter in stove total air at least both.
13. systems according to claim 11, is characterized in that, described database server is also for reaching the described boiler operating parameter of rule rejecting abnormalities according to Rye.
14. systems according to claim 11, it is characterized in that, described database server is for calculating coefficient correlation between described boiler operating parameter and described boiler efficiency and the coefficient correlation between described boiler operating parameter and described NOx discharge capacity according to following formula:
ρ wherein
ijfor boiler operating parameter x
iwith boiler efficiency or NOx discharge capacity y
jbetween coefficient correlation,
for boiler operating parameter x
iaverage,
for boiler efficiency or NOx discharge capacity y
javerage, i, j are positive integer.
15. systems according to claim 14, it is characterized in that, described database server is for selecting coefficient correlation between described boiler operating parameter and described boiler efficiency to be greater than the boiler operating parameter that coefficient correlation between the first preset value and described boiler operating parameter and described NOx discharge capacity is greater than the second preset value.
16. systems according to claim 14, is characterized in that, described database server is for building the neutral net that comprises input layer, hidden layer and output layer; The node value of the described boiler operating parameter of described coefficient correlation condition as input layer will be met; By described neural computing, go out as the described boiler efficiency of output layer node and the value of described NOx discharge capacity.
17. according to the system described in claim 11-16 any one, it is characterized in that, described database server is for boiler operating parameter, described boiler efficiency and described NOx discharge capacity described in normalization.
18. according to the system described in claim 11-16 any one, it is characterized in that the ammonia consumption of described database server for needing according to described NOx Emission amount calculation SCR equipment.
19. systems according to claim 18, is characterized in that, described database server is used for utilizing NH
3at least one in/NO mol ratio, flue-gas temperature, flue gas flow ratio and the escaping of ammonia rate revised denitration efficiency.
20. systems according to claim 18, is characterized in that, described database server is for utilizing wet flue gas flow correction ammonia consumption in the CONCENTRATION DISTRIBUTION of SCR equipment flue NOx and/or SCR equipment flue.
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