CN115374632B - Calculation method and related device for outlet flue gas in SNCR (selective non-catalytic reduction) denitration system - Google Patents
Calculation method and related device for outlet flue gas in SNCR (selective non-catalytic reduction) denitration system Download PDFInfo
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 287
- 239000003546 flue gas Substances 0.000 title claims abstract description 287
- 238000004364 calculation method Methods 0.000 title claims abstract description 54
- 238000010531 catalytic reduction reaction Methods 0.000 title claims description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 108
- 238000000034 method Methods 0.000 claims abstract description 79
- 230000008569 process Effects 0.000 claims abstract description 33
- 239000000779 smoke Substances 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 230000001960 triggered effect Effects 0.000 claims description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 123
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 10
- 235000011114 ammonium hydroxide Nutrition 0.000 description 10
- 239000007789 gas Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 238000004590 computer program Methods 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 5
- 238000004422 calculation algorithm Methods 0.000 description 5
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 230000000977 initiatory effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- 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
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
-
- 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/10—Numerical modelling
Abstract
The application discloses a calculation method and a related device of outlet flue gas in an SNCR denitration system, wherein the method comprises the following steps: s1, determining flue gas data at an inlet of an SNCR denitration system; s2, calculating a first reaction quantity of preset flue gas in the denitration process of the SNCR denitration system according to flue gas data at an inlet; s3, calculating a first total amount of outlet flue gas in the SNCR denitration system according to the first reaction amount; s4, calculating a second reaction quantity of the outlet flue gas according to the first total quantity; s5, calculating second total amount of outlet flue gas according to the second reaction amount; and S6, comparing whether the difference value between the first total amount and the second total amount of the outlet flue gas is smaller than a preset threshold value, if so, taking the second total amount as the target total amount of the outlet flue gas, and if not, taking the second total amount as the new first total amount, and returning to the step S4. Solves the technical problem that the prior SNCR denitration system does not effectively calculate the outlet flue gas.
Description
Technical Field
The application relates to the technical field of environmental protection, in particular to a calculation method and a related device for outlet flue gas in an SNCR denitration system.
Background
With the development of urban process and the improvement of living standard of people, the living garbage generated by people is greatly increased, the harmless treatment of garbage is a necessary choice, and the reduction and harmless degree of the garbage incineration treatment are highThe advantage is that the method becomes the existing main stream garbage disposal mode. However, nitrogen Oxides (NO) are generated during the garbage incineration process X ) Such contaminants, if not purified, are directly discharged to the environment, can have a detrimental effect on the ecosystem. Therefore, the garbage incineration is generally accompanied by flue gas dissales.
The term "flue gas denitration" refers to NO to be generated X Reduction to N 2 Or the neutralization reaction generates nitrate, thereby removing NO in the flue gas X . SNCR de-marketing is one of the technologies for flue gas de-marketing. The calculation of the outlet flue gas of the SNCR denitration system for SNCR denitration can ensure the denitration performance, however, no effective calculation method of the outlet flue gas of the SNCR denitration system exists.
Disclosure of Invention
The application provides a calculation method and a related device for outlet flue gas in an SNCR (selective non-catalytic reduction) denitration system, which can calculate the outlet flue gas of the SNCR denitration system and solve the technical problem that the outlet flue gas of the SNCR denitration system is not effectively calculated in the prior art.
In view of this, the first aspect of the present application provides a method for calculating an outlet flue gas in an SNCR denitration system, including:
s1, determining flue gas data at an inlet of an SNCR denitration system;
s2, calculating a first reaction quantity of preset flue gas in the SNCR denitration system denitration process according to the flue gas data at the inlet;
s3, calculating a first total amount of outlet flue gas in the SNCR denitration system according to the first reaction amount;
s4, calculating a second reaction amount of the outlet flue gas according to the first total amount;
s5, calculating a second total amount of the outlet flue gas according to the second reaction amount;
and S6, comparing whether the difference value between the first total amount and the second total amount of the outlet flue gas is smaller than a preset threshold value, if so, taking the second total amount as the target total amount of the outlet flue gas, and if not, taking the second total amount as the new first total amount, and returning to the step S4.
Optionally, the flue gas data includes: o (O) 2 Content and dry smoke amount; the preset flue gas comprises the following components: NO;
the step S2 specifically includes:
according to O at the inlet 2 Calculating the standard state volume of NO at the outlet of the SNCR denitration system according to the content and the dry smoke quantity;
and calculating the first reaction quantity of NO in the denitration process of the SNCR denitration system according to the standard state volume of NO at the outlet.
Optionally, O at the inlet 2 The calculation formula of the content is as follows:
in the method, in the process of the invention,o in dry flue gas imported from SNCR (selective non-catalytic reduction) pin removal system under standard state 2 Content,%, -and%>O in dry flue gas imported from SNCR (selective non-catalytic reduction) pin removal system under standard state 2 Normal state volume, nm 3 (kg garbage), ->Is the standard state volume of dry flue gas imported by an SNCR (selective non-catalytic reduction) pin removal system in a standard state, nm 3 /(kg of refuse).
Optionally, the calculation formula of the first reaction amount is:
in the method, in the process of the invention,for SNCR derailmentFirst reaction amount of NO, nm in the system 3 (kg garbage), ->Is the standard state volume, nm, of NO at the outlet of the SNCR denitration system under the standard state 3 (kg garbage), ->Is the standard state volume, nm, of NO at the inlet of the SNCR denitration system under the standard state 3 /(kg of refuse).
Optionally, the outlet flue gas comprises: NO, NH 3 、O 2 、N 2 And H 2 O；
The step S3 specifically includes:
according to the first reaction quantity corresponding to NO, calculating a first total quantity corresponding to NO in the outlet flue gas;
according to the first reaction quantity corresponding to NO, NH in the outlet flue gas is calculated 3 、O 2 、N 2 And H 2 The third reaction amount corresponding to each O;
according to NH in the outlet flue gas 3 、O 2 、N 2 And H 2 O respectively corresponds to a third reaction quantity, and NH in the outlet flue gas is calculated 3 、O 2 、N 2 And H 2 And O respectively corresponds to the first total amount.
Optionally, the NH in the outlet flue gas is calculated according to the first reaction quantity corresponding to NO 3 、O 2 、N 2 And H 2 The third reaction amount corresponding to each O specifically comprises:
according to the first reaction quantity corresponding to NO, NH in the outlet flue gas is calculated 3 Corresponding third reaction amountIs->
Calculating according to the first reaction quantity corresponding to NOO in the outlet flue gas 2 Corresponding third reaction amountIs->
According to the first reaction quantity corresponding to NO, calculating N in the outlet flue gas 2 Corresponding third generation amountIs->
According to the first reaction quantity corresponding to NO, H in the outlet flue gas is calculated 2 Third production amount corresponding to OIs->
Optionally, the method comprises the step of adding NH in the outlet flue gas 3 、O 2 、N 2 And H 2 O respectively corresponds to a third reaction quantity, and NH in the outlet flue gas is calculated 3 、O 2 、N 2 And H 2 The first total amount corresponding to each O specifically comprises:
according to NH in the outlet flue gas 3 And NH 3 Calculating the input amount of NH in the outlet flue gas 3 Is a first total amount of (a);
according to O in the outlet flue gas 2 And O 2 Calculating the input amount of O in the outlet flue gas 2 Is a first total amount of (a);
according to N in the outlet flue gas 2 And N 2 Calculating the input amount of N in the outlet flue gas 2 Is a first total amount of (a);
according toH in the outlet flue gas 2 Third production amount of O and H 2 O input amount is calculated, and H in the outlet flue gas is calculated 2 A first total amount of O.
The second aspect of the application provides a method for calculating outlet flue gas in an SNCR denitration system, which comprises the following steps:
the determining unit is used for determining the flue gas data at the inlet of the SNCR denitration system;
the first calculation unit is used for calculating a first reaction quantity of preset flue gas in the SNCR denitration system denitration process according to the flue gas data at the inlet;
the second calculation unit is used for calculating the first total amount of the outlet flue gas in the SNCR denitration system according to the first reaction amount;
a third calculation unit for calculating a second reaction amount of the outlet flue gas according to the first total amount;
a fourth calculation unit for calculating a second total amount of the outlet flue gas according to the second reaction amount;
and the comparison unit is used for comparing whether the difference value between the first total amount and the second total amount of the outlet smoke is smaller than a preset threshold value, if so, the second total amount is used as the target total amount of the outlet smoke, and if not, the third calculation unit is triggered after the second total amount is used as the new first total amount.
A third aspect of the present application provides a computing device for outlet flue gas in an SNCR denitration system, the device comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the method for calculating the outlet flue gas in the SNCR denitration system according to any one of the first aspects according to the instructions in the program code.
A fourth aspect of the present application provides a computer readable storage medium for storing program code for performing the method of calculating outlet flue gas in any one of the SNCR denitration systems of the first aspect.
From the above technical scheme, the application has the following advantages:
the method for calculating the outlet flue gas in the SNCR denitration system comprises the following steps: s1, determining flue gas data at an inlet of an SNCR denitration system; s2, calculating a first reaction quantity of preset flue gas in the denitration process of the SNCR denitration system according to flue gas data at an inlet; s3, calculating a first total amount of outlet flue gas in the SNCR denitration system according to the first reaction amount; s4, calculating a second reaction quantity of the outlet flue gas according to the first total quantity; s5, calculating second total amount of outlet flue gas according to the second reaction amount; and S6, comparing whether the difference value between the first total amount and the second total amount of the outlet flue gas is smaller than a preset threshold value, if so, taking the second total amount as the target total amount of the outlet flue gas, and if not, taking the second total amount as the new first total amount, and returning to the step S4.
In the method, the outlet flue gas in the SNCR denitration system is determined in an iterative calculation mode, at the iteration initiation, the flue gas data at the inlet of the SNCR denitration system is used as initial iterative data, the outlet flue gas in the SNCR denitration system is calculated through the initial iterative data, after the initial iteration is completed, the outlet flue gas obtained through the initial iterative calculation is used as iterative data to calculate the outlet flue gas in the SNCR denitration system, when the difference value between the two adjacent outlet flue gas is smaller than a preset threshold value, the algorithm is described to be converged, the calculated data of the outlet flue gas is the actual data (namely target data) of the outlet flue gas, the calculation of the outlet flue gas in the SNCR denitration system is realized, and the technical problem that the outlet flue gas of the SNCR denitration system is not effectively calculated in the prior art is solved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic flow chart of an embodiment one of a method for calculating an outlet flue gas in an SNCR denitration system according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a second embodiment of a method for calculating an outlet flue gas in an SNCR denitration system according to the embodiment of the present application;
fig. 3 is a schematic structural diagram of an embodiment of a computing device for outlet flue gas in an SNCR denitration system according to an embodiment of the present application.
Detailed Description
The embodiment of the application provides a calculation method and a related device for outlet flue gas in an SNCR (selective non-catalytic reduction) denitration system, which realize the calculation of the outlet flue gas in the SNCR denitration system and solve the technical problem that the outlet flue gas of the SNCR denitration system is not effectively calculated in the prior art.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the embodiments described below are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Referring to fig. 1, fig. 1 is a schematic flow chart of an embodiment of a method for calculating an outlet flue gas in an SNCR denitration system according to an embodiment of the present application.
The method for calculating the outlet flue gas in the SNCR denitration system in the embodiment specifically comprises the following steps:
and step 101, determining flue gas data at an inlet of the SNCR denitration system.
For the SNCR pin removal system, although the SNCR pin removal system is positioned in a reaction window temperature area in a hearth, namely the hearth, for simplifying calculation and facilitating understanding, the SNCR pin removal system is distinguished from the combustion process in the hearth and is regarded as an independent system, and the outlet flue gas of the hearth is the inlet flue gas of the SNCR pin removal system, and parameters such as connection temperature, pressure and the like are also regarded as unchanged.
According to the definition of the removal efficiency, by combining the known converted concentration of the dry flue gas at the inlet of the SNCR denitration system, the converted concentration of the dry flue gas at the outlet of the SNCR denitration system can be deduced as follows:
the concentration is converted into NO in dry flue gas at the outlet of the SNCR denitration system in a standard state, and mg/Nm3;the concentration is converted into NO in dry flue gas imported from an SNCR (selective non-catalytic reduction) denitration system in a standard state, and mg/Nm3; />Denitration efficiency of SNCR denitration system,%.
However, the actual concentration, the standard state volume, the standard state mass, the standard mole and other parameters cannot be directly calculated only by knowing the converted concentration of NO at the outlet of the SNCR denitration system, and the O at the outlet needs to be supplemented 2 Content, dry smoke amount and the like. And O at the outlet 2 The content and the dry smoke amount can be calculated according to parameters such as standard state volume, mass, molar quantity and the like of NO at the outlet of the SNCR denitration system, so that an iterative loop calculation process can be constructed.
In this application, the target total amount of the outlet flue gas is determined by continuously performing iterative calculation on the outlet flue gas, however, in the initial calculation, the data of the outlet flue gas is uncertain, but the flue gas data of the inlet flue gas is known, so in this embodiment, the flue gas data at the inlet of the SNCR denitration system is determined first, and then the calculation of the initial relevant data of the outlet flue gas is performed through the flue gas data at the inlet.
Step 102, calculating a first reaction quantity of preset flue gas in the denitration process of the SNCR denitration system according to the flue gas data at the inlet.
According to the flue gas data of import department in this application, can calculate the first reaction volume of preset flue gas in the SNCR denitration system denitration process.
Step 103, calculating a first total amount of outlet flue gas in the SNCR denitration system according to the first reaction amount.
After obtaining the first reaction amount of the preset flue gas in the SNCR denitration system, the first total amount of the outlet flue gas in the SNCR denitration system can be calculated.
Step 104, calculating a second reaction amount of the outlet flue gas according to the first total amount.
And calculating to obtain a second reaction quantity of the outlet flue gas according to the first total quantity of the flue gas in the outlet flue gas and the input quantity of the flue gas in the inlet flue gas.
Step 105, calculating a second total amount of the outlet flue gas according to the second reaction amount.
And step 106, comparing whether the difference between the first total amount and the second total amount of the outlet flue gas is smaller than a preset threshold value, if so, taking the second total amount as the target total amount of the outlet flue gas, and if not, taking the second total amount as the new first total amount, and returning to the step 104.
The difference between the first total amount and the second total amount of the outlet flue gas is smaller than a preset threshold value, which indicates that the algorithm converges, and the calculated second total amount can be used as the target total amount of the outlet flue gas.
It can be appreciated that the magnitude of the preset threshold may be set as required, which is not specifically limited and described in this embodiment.
According to the embodiment, the outlet flue gas in the SNCR denitration system is determined in an iterative calculation mode, at the iteration initiation, the flue gas data at the inlet of the SNCR denitration system is used as initial iterative data, the outlet flue gas in the SNCR denitration system is calculated through the initial iterative data, after the initial iteration is completed, the outlet flue gas obtained through the initial iterative calculation is used as iterative data to calculate the outlet flue gas in the SNCR denitration system, when the difference value of the outlet flue gas of two adjacent times is smaller than a preset threshold value, the algorithm is described to be converged, and at the moment, the calculated data of the outlet flue gas is the actual data (namely target data) of the outlet flue gas, so that the calculation of the outlet flue gas in the SNCR denitration system is realized, and the technical problem that the outlet flue gas of the SNCR denitration system is not effectively calculated in the prior art is solved.
Referring to fig. 2, fig. 2 is a flow chart of a second embodiment of a method for calculating an outlet flue gas in an SNCR denitration system according to the embodiment of the present application.
The method for calculating the outlet flue gas in the SNCR denitration system in the embodiment specifically comprises the following steps:
step 201, determining O at inlet of SNCR denitration system 2 Content and dry smoke amount.
Considering that the smoke condition of the inlet and the outlet of the SNCR is approximate, the O at the inlet of the SNCR 2 The content and the dry smoke volume are used as initial data for iteration, it being understood that O at the inlet 2 The calculation formula of the content is as follows:
in the method, in the process of the invention,o in dry flue gas imported from SNCR (selective non-catalytic reduction) pin removal system under standard state 2 Content,%, -and%>O in dry flue gas imported from SNCR (selective non-catalytic reduction) pin removal system under standard state 2 Normal state volume, nm 3 (kg garbage), ->Is the standard state volume of dry flue gas imported by an SNCR (selective non-catalytic reduction) pin removal system in a standard state, nm 3 /(kg of refuse).
Step 202, according to O at the inlet 2 And calculating the standard state volume of NO at the outlet of the SNCR denitration system by the content and the dry smoke quantity.
The calculation formula corresponding to the standard state volume of NO at the outlet of the SNCR denitration system is as follows:
in the method, in the process of the invention,is the standard state volume, nm, of NO in the outlet of the SNCR pin removal system in the standard state 3 (kg garbage), ->Is the actual concentration of NO in dry flue gas at the outlet of the SNCR pin removal system under the standard state, mg/Nm 3 ，V m The value of the gas molar volume constant is generally approximately 22.4, L/mol and M NO Is the molar mass of NO, g/mol, & lt/mol>For the standard state volume of the dry flue gas at the outlet of the SNCR pin removal system in the standard state, the iteration is carried out by substituting the value determined in the step 201 and Nm 3 /(kg of refuse).
Specifically, the actual concentration of NO in the dry flue gas at the outlet of the SNCR de-marketing system under standard conditions
The calculation formula of (2) is as follows:
in the method, in the process of the invention,is the converted concentration of NO in dry flue gas at the outlet of the SNCR pin removal system under the standard state, mg/Nm 3 ，/>In a standard stateO in dry flue gas at outlet of SNCR (selective non-catalytic reduction) pin removal system 2 Content, iteration is initially substituted into the value of the corresponding parameter at the inlet (i.e., the value determined by step 201),%.
Step 203, calculating a first reaction quantity of NO in the denitration process of the SNCR denitration system according to the standard state volume of NO at the outlet.
Specifically, the calculation formula of the first reaction amount is:
in the method, in the process of the invention,for the first reaction amount of NO in SNCR off-line system, nm 3 (kg garbage), ->Is the standard state volume, nm, of NO at the outlet of the SNCR denitration system under the standard state 3 (kg garbage), ->Is the standard state volume, nm, of NO at the inlet of the SNCR denitration system under the standard state 3 /(kg of refuse).
Step 204, calculating a first total amount corresponding to NO in the outlet flue gas according to the first reaction amount corresponding to NO.
It will be appreciated that at the beginning of the iteration, the first total amount of NO corresponds to the first reaction amount of NO.
Step 205, according to the first reaction amount corresponding to NO, NH in the outlet flue gas is calculated 3 、O 2 、N 2 And H 2 And O corresponds to the third reaction amount respectively.
It can be appreciated that the NH in the outlet flue gas is calculated according to the first reaction amount corresponding to NO 3 、O 2 、N 2 And H 2 The third reaction amount corresponding to each O specifically comprises:
according to the first reaction corresponding to NOCalculating the NH in the outlet flue gas 3 Corresponding third reaction amountIs that
According to the first reaction quantity corresponding to NO, O in the outlet flue gas is calculated 2 Corresponding third reaction amountIs that
According to the first reaction quantity corresponding to NO, N in the outlet flue gas is calculated 2 Corresponding third generation amountIs that
According to the first reaction quantity corresponding to NO, H in the outlet flue gas is calculated 2 Third production amount corresponding to OIs that
It is understood that in one chemical reaction, there is a reaction of a substance that necessarily has the formation of other substances.
Step 206, according to NH in the outlet flue gas 3 、O 2 、N 2 And H 2 O respectively corresponds to a third reaction quantity, and NH in the outlet flue gas is calculated 3 、O 2 、N 2 And H 2 And O respectively corresponds to the first total amount.
According to NH in the outlet flue gas 3 、O 2 、N 2 And H 2 O respectively corresponds to a third reaction quantity, and NH in the outlet flue gas is calculated 3 、O 2 、N 2 And H 2 The first total amount corresponding to each O specifically comprises:
according to NH in the outlet flue gas 3 And NH 3 Calculating the NH in the outlet flue gas 3 Is a first total amount of (a);
according to O in the outlet flue gas 2 And O 2 Calculating the input of O in the outlet flue gas 2 Is a first total amount of (a);
according to N in the outlet flue gas 2 And N 2 Calculating the input of N in the outlet flue gas 2 Is a first total amount of (a);
according to H in the outlet flue gas 2 Third production amount of O and H 2 O input amount, and H in outlet flue gas is calculated 2 A first total amount of O.
The inlet material of the SNCR pin removal system comprises ammonia water solution sprayed by a spray gun and compressed gas for atomizing the ammonia water solution besides flue gas. According to the definition of ammonia nitrogen molar ratio, knowing the standard state volume of NO in the imported flue gas, the total NH in the ammonia water solution put into the SNCR denitration system can be calculated at first 3 ·H 2 Standard state volume of O(Unit Nm) 3 /(kg of waste)) and mass->The unit is kg/(kg garbage):
in the method, in the process of the invention,can be adjusted and controlled to be ammonia nitrogen molar ratio, has no dimension, and is->Is NH 3 ·H 2 O molar mass, g/mol.
The concentration of ammonia used in the SNCR stripping system is generally constant, and 10% by weight of the reference in this example is selected to give an ammonia solutionThe mass of (3) is as follows: />
The other major component of the aqueous ammonia solution is water, and the mass of water fed to the SNCR de-marketing system can be deduced by omitting other minor componentsAnd standard state volume->The method comprises the following steps:
in the method, in the process of the invention,is H 2 O molar mass, g/mol.
The calculated parameters such as the volume of the ammonia solution are values existing in the gas state in the standard state, and the ammonia is not in the gas state in the standard state in practice, even in the reaction processAlso in liquid form. As the mass concentration of the ammonia water solution is known, the density of the ammonia water solution is 0.895g/cm < 3 > by looking up a table, and the actual volume V can be deduced Ammonia water solution (unit is m 3 The calculation formula of/(kg of garbage)) is:
the ammonia solution is sprayed into the SNCR denitration system through the spray gun, and the gas is sprayed together to play a role of atomizing the solution so as to ensure that the solution and the flue gas are more fully and uniformly mixed. The specific optional gas types include compressed air, nitrogen and the like; the specific injected gas amount can be regulated and controlled, and the atomization effect can be influenced so as to indirectly influence the removal efficiency.
The common gas is compressed air, the dosage of the gas is related to the actual volume of the ammonia water solution, and the gas-liquid volume ratio is set to be 3 (standard state volume). The compressed air consumption of the SNCR pin removal system can be deduced(in Nm) 3 /(kg of garbage)) is: />
Correspondingly, NH in the outlet flue gas 3 Is the first total amount of (1)O in the outlet flue gas 2 Is +.>N in the outlet flue gas 2 Is the first total amount of (1)H in the outlet flue gas 2 The first total amount of O is
Step 207, calculating a second reaction amount of the outlet flue gas according to the first total amount.
Step 208, calculating a second total amount of the outlet flue gas according to the second reaction amount.
Step 209, comparing whether the difference between the first total amount and the second total amount of the outlet flue gas is smaller than a preset threshold, if yes, taking the second total amount as the target total amount of the outlet flue gas, if not, taking the second total amount as the new first total amount, and returning to step 207.
According to the embodiment, the outlet flue gas in the SNCR denitration system is determined in an iterative calculation mode, at the iteration initiation, the flue gas data at the inlet of the SNCR denitration system is used as initial iterative data, the outlet flue gas in the SNCR denitration system is calculated through the initial iterative data, after the initial iteration is completed, the outlet flue gas obtained through the initial iterative calculation is used as iterative data to calculate the outlet flue gas in the SNCR denitration system, when the difference value of the outlet flue gas of two adjacent times is smaller than a preset threshold value, the algorithm is described to be converged, and at the moment, the calculated data of the outlet flue gas is the actual data (namely target data) of the outlet flue gas, so that the calculation of the outlet flue gas in the SNCR denitration system is realized, and the technical problem that the outlet flue gas of the SNCR denitration system is not effectively calculated in the prior art is solved.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an embodiment of a computing device for outlet flue gas in an SNCR denitration system according to an embodiment of the present application.
The calculation device for the outlet flue gas in the SNCR denitration system in this embodiment may specifically include:
the determining unit is used for determining the flue gas data at the inlet of the SNCR denitration system;
the first calculation unit is used for calculating a first reaction quantity of preset flue gas in the denitration process of the SNCR denitration system according to the flue gas data at the inlet;
the second calculation unit is used for calculating the first total amount of the outlet flue gas in the SNCR denitration system according to the first reaction amount;
the third calculation unit is used for calculating a second reaction amount of the outlet flue gas according to the first total amount;
a fourth calculation unit for calculating a second total amount of the outlet flue gas according to the second reaction amount;
and the comparison unit is used for comparing whether the difference value between the first total amount and the second total amount of the outlet smoke is smaller than a preset threshold value, if so, the second total amount is used as the target total amount of the outlet smoke, and if not, the third calculation unit is triggered after the second total amount is used as the new first total amount.
Optionally, the flue gas data comprises: o (O) 2 Content and dry smoke amount; the preset flue gas comprises the following components: NO;
according to the flue gas data of import department, calculate SNCR deNOx systems and remove first reactant of the flue gas of presetting in the sales process specifically includes:
according to O at the inlet 2 Calculating the standard state volume of NO at the outlet of the SNCR denitration system according to the content and the dry smoke quantity;
and calculating the first reaction quantity of NO in the denitration process of the SNCR denitration system according to the standard state volume of NO at the outlet.
Further, O at the inlet 2 The calculation formula of the content is as follows:
in the method, in the process of the invention,o in dry flue gas imported from SNCR (selective non-catalytic reduction) pin removal system under standard state 2 Content,%, -and%>O in dry flue gas imported from SNCR (selective non-catalytic reduction) pin removal system under standard state 2 Normal state volume, nm 3 (kg garbage), ->Is the standard state volume of dry flue gas imported by an SNCR (selective non-catalytic reduction) pin removal system in a standard state, nm 3 /(kg of refuse).
Specifically, the calculation formula of the first reaction amount is:
in the method, in the process of the invention,for the first reaction amount of NO in SNCR off-line system, nm 3 (kg garbage), ->Is the standard state volume, nm, of NO at the outlet of the SNCR denitration system under the standard state 3 (kg garbage), ->Is the standard state volume, nm, of NO at the inlet of the SNCR denitration system under the standard state 3 /(kg of refuse).
Preferably, the outlet flue gas comprises: NO, NH 3 、O 2 、N 2 And H 2 O；
According to the first reaction quantity, calculating a first total quantity of outlet flue gas in the SNCR denitration system comprises the following steps:
according to the first reaction quantity corresponding to NO, calculating a first total quantity corresponding to NO in the outlet flue gas;
according to the first reaction quantity corresponding to NO, NH in the outlet flue gas is calculated 3 、O 2 、N 2 And H 2 The third reaction amount corresponding to each O;
according to NH in the outlet flue gas 3 、O 2 、N 2 And H 2 O respectively corresponds to a third reaction quantity, and NH in the outlet flue gas is calculated 3 、O 2 、N 2 And H 2 And O respectively corresponds to the first total amount.
Optionally, according to the first reaction quantity corresponding to NO, NH in the outlet flue gas is calculated 3 、O 2 、N 2 And H 2 The third reaction amount corresponding to each O specifically comprises:
calculating the outlet smoke according to the first reaction quantity corresponding to NONH in gas 3 Corresponding third reaction amountIs that
According to the first reaction quantity corresponding to NO, O in the outlet flue gas is calculated 2 Corresponding third reaction amountIs that
According to the first reaction quantity corresponding to NO, N in the outlet flue gas is calculated 2 Corresponding third generation amountIs that
According to the first reaction quantity corresponding to NO, H in the outlet flue gas is calculated 2 Third production amount corresponding to OIs that
In particular, according to NH in the outlet flue gas 3 、O 2 、N 2 And H 2 O respectively corresponds to a third reaction quantity, and NH in the outlet flue gas is calculated 3 、O 2 、N 2 And H 2 The first total amount corresponding to each O specifically comprises:
according to NH in the outlet flue gas 3 And NH 3 Calculating the NH in the outlet flue gas 3 Is a first total amount of (a);
according to O in the outlet flue gas 2 Third reaction of (2)The amount of the additive and O 2 Calculating the input of O in the outlet flue gas 2 Is a first total amount of (a);
according to N in the outlet flue gas 2 And N 2 Calculating the input of N in the outlet flue gas 2 Is a first total amount of (a);
according to H in the outlet flue gas 2 Third production amount of O and H 2 O input amount, and H in outlet flue gas is calculated 2 A first total amount of O.
According to the embodiment, the outlet flue gas in the SNCR denitration system is determined in an iterative calculation mode, at the iteration initiation, the flue gas data at the inlet of the SNCR denitration system is used as initial iterative data, the outlet flue gas in the SNCR denitration system is calculated through the initial iterative data, after the initial iteration is completed, the outlet flue gas obtained through the initial iterative calculation is used as iterative data to calculate the outlet flue gas in the SNCR denitration system, when the difference value of the outlet flue gas of two adjacent times is smaller than a preset threshold value, the algorithm is described to be converged, and at the moment, the calculated data of the outlet flue gas is the actual data (namely target data) of the outlet flue gas, so that the calculation of the outlet flue gas in the SNCR denitration system is realized, and the technical problem that the outlet flue gas of the SNCR denitration system is not effectively calculated in the prior art is solved.
The embodiment of the application also provides an embodiment of a computing device for outlet flue gas in an SNCR denitration system, wherein the device comprises a processor and a memory; the memory is used for storing the program codes and transmitting the program codes to the processor; the processor is configured to execute the method for calculating the outlet flue gas in the SNCR denitration system according to the foregoing embodiment according to an instruction in the program code.
The embodiment of the application also provides an embodiment of a computer readable storage medium, wherein the computer readable storage medium is used for storing program codes, and the program codes are used for executing the calculation method of the outlet flue gas in the SNCR denitration system of the embodiment.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
It will be apparent to those skilled in the art that embodiments of the present application may be provided as a method, apparatus, or computer program product. Accordingly, the present embodiments may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application may take the form of a computer program product on one or more computer-usable computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present embodiments have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the present application.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or terminal device comprising the element.
The above embodiments are merely for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. A method for calculating outlet flue gas in an SNCR denitration system, comprising:
s1, determining flue gas data at an inlet of an SNCR denitration system;
s2, calculating a first reaction quantity of preset flue gas in the SNCR denitration system denitration process according to the flue gas data at the inlet; wherein the flue gas data at the inlet comprises: o2 content and dry smoke volume; the preset flue gas comprises the following components: NO;
s3, calculating a first total amount of outlet flue gas in the SNCR denitration system according to the first reaction amount;
s4, calculating a second reaction amount of the outlet flue gas according to the first total amount;
s5, calculating a second total amount of the outlet flue gas according to the second reaction amount;
and S6, comparing whether the difference value between the first total amount and the second total amount of the outlet flue gas is smaller than a preset threshold value, if so, taking the second total amount as the target total amount of the outlet flue gas, and if not, taking the second total amount as the new first total amount, and returning to the step S4.
2. The method for calculating the outlet flue gas in the SNCR denitration system according to claim 1, wherein the step S2 specifically includes:
according to O at the inlet 2 Calculating the standard state volume of NO at the outlet of the SNCR denitration system according to the content and the dry smoke quantity;
and calculating the first reaction quantity of NO in the denitration process of the SNCR denitration system according to the standard state volume of NO at the outlet.
3. The method for calculating the outlet flue gas in an SNCR denitration system according to claim 2, wherein the O at the inlet 2 The calculation formula of the content is as follows:
in the method, in the process of the invention,o in dry flue gas imported from SNCR (selective non-catalytic reduction) pin removal system under standard state 2 Content,%, -and%>O in dry flue gas imported from SNCR (selective non-catalytic reduction) pin removal system under standard state 2 Normal state volume, nm 3 (kg garbage), ->Is the standard state volume of dry flue gas imported by an SNCR (selective non-catalytic reduction) pin removal system in a standard state, nm 3 /(kg of refuse).
4. The method for calculating the outlet flue gas in the SNCR denitration system according to claim 3, wherein the calculation formula of the first reaction amount is:
in the method, in the process of the invention,for the first reaction amount of NO in SNCR off-line system, nm 3 (kg garbage), ->Is the standard state volume, nm, of NO at the outlet of the SNCR denitration system under the standard state 3 (kg garbage), ->Is a standard state body of NO at the inlet of the SNCR denitration system under the standard stateAccumulation Nm 3 /(kg of refuse).
5. The method for calculating an outlet flue gas in an SNCR denitration system according to claim 2, wherein the outlet flue gas includes: NO, NH 3 、O 2 、N 2 And H 2 O；
The step S3 specifically includes:
according to the first reaction quantity corresponding to NO, calculating a first total quantity corresponding to NO in the outlet flue gas;
according to the first reaction quantity corresponding to NO, NH in the outlet flue gas is calculated 3 、O 2 、N 2 And H 2 The third reaction amount corresponding to each O;
according to NH in the outlet flue gas 3 、O 2 、N 2 And H 2 O respectively corresponds to a third reaction quantity, and NH in the outlet flue gas is calculated 3 、O 2 、N 2 And H 2 And O respectively corresponds to the first total amount.
6. The method for calculating an outlet flue gas in an SNCR denitration system according to claim 5, wherein the NH in the outlet flue gas is calculated according to a first reaction amount corresponding to NO 3 、O 2 、N 2 And H 2 The third reaction amount corresponding to each O specifically comprises:
according to the first reaction quantity corresponding to NO, NH in the outlet flue gas is calculated 3 Corresponding third reaction amountIs that
According to the first reaction quantity corresponding to NO, calculating O in the outlet flue gas 2 Corresponding third reaction amount
According to the first reaction quantity corresponding to NO, calculating N in the outlet flue gas 2 Corresponding third generation amountIs that
According to the first reaction quantity corresponding to NO, H in the outlet flue gas is calculated 2 Third production amount corresponding to OIs that
7. The method for calculating the outlet flue gas in the SNCR denitration system as set forth in claim 6, wherein the NH value in the outlet flue gas is calculated based on the calculated NH value in the outlet flue gas 3 、O 2 、N 2 And H 2 O respectively corresponds to a third reaction quantity, and NH in the outlet flue gas is calculated 3 、O 2 、N 2 And H 2 The first total amount corresponding to each O specifically comprises:
according to NH in the outlet flue gas 3 And NH 3 Calculating the input amount of NH in the outlet flue gas 3 Is a first total amount of (a);
according to O in the outlet flue gas 2 And O 2 Calculating the input amount of O in the outlet flue gas 2 Is a first total amount of (a);
according to N in the outlet flue gas 2 And N 2 Calculating the input amount of N in the outlet flue gas 2 Is a first total amount of (a);
according to H in the outlet flue gas 2 Third production amount of O and H 2 O input amount is calculated, and H in the outlet flue gas is calculated 2 A first total amount of O.
8. A computing device for outlet flue gas in an SNCR denitration system, comprising:
the determining unit is used for determining the flue gas data at the inlet of the SNCR denitration system;
the first calculation unit is used for calculating a first reaction quantity of preset flue gas in the SNCR denitration system denitration process according to the flue gas data at the inlet; wherein the flue gas data at the inlet comprises: o2 content and dry smoke volume; the preset flue gas comprises the following components: NO;
the second calculation unit is used for calculating the first total amount of the outlet flue gas in the SNCR denitration system according to the first reaction amount;
a third calculation unit for calculating a second reaction amount of the outlet flue gas according to the first total amount;
a fourth calculation unit for calculating a second total amount of the outlet flue gas according to the second reaction amount;
and the comparison unit is used for comparing whether the difference value between the first total amount and the second total amount of the outlet smoke is smaller than a preset threshold value, if so, the second total amount is used as the target total amount of the outlet smoke, and if not, the third calculation unit is triggered after the second total amount is used as the new first total amount.
9. A computing device for outlet flue gas in an SNCR denitration system, the device comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to perform the method of calculating the outlet flue gas in the SNCR denitration system according to any one of claims 1 to 7 according to instructions in the program code.
10. A computer readable storage medium for storing program code for performing the method of calculating the outlet flue gas in an SNCR denitration system according to any one of claims 1 to 7.
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