CN115374632A - 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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- 239000003546 flue gas Substances 0.000 title claims abstract description 294
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 291
- 238000004364 calculation method Methods 0.000 title claims abstract description 36
- 238000010531 catalytic reduction reaction Methods 0.000 title claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 116
- 238000000034 method Methods 0.000 claims abstract description 51
- 230000008569 process Effects 0.000 claims abstract description 23
- 150000001875 compounds Chemical class 0.000 claims description 12
- 239000002699 waste material Substances 0.000 claims description 9
- 239000000779 smoke Substances 0.000 claims description 7
- 230000001960 triggered effect Effects 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 121
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 12
- 235000011114 ammonium hydroxide Nutrition 0.000 description 12
- 238000010586 diagram Methods 0.000 description 10
- 238000004590 computer program Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 5
- 238000004422 calculation algorithm Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 231100000719 pollutant Toxicity 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
- 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
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 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
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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 for outlet flue gas in an SNCR (selective non-catalytic reduction) denitration system, wherein the method comprises the following steps: s1, determining flue gas data at an inlet of an SNCR (selective non catalytic reduction) denitration system; s2, calculating a first reaction amount of preset flue gas in the denitration process of the SNCR denitration system 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 quantity of the outlet flue gas according to the first total quantity; 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, returning to the step S4 after taking the second total amount as a new first total amount. The technical problem that the existing outlet flue gas without an SNCR denitration system is effectively calculated is solved.
Description
Technical Field
The application belongs to the technical field of environmental protection, and particularly relates to a calculation method and a related device for outlet flue gas in an SNCR (selective non-catalytic reduction) denitration system.
Background
Along with the development of the urbanization process and the improvement of the living standard of people, the domestic garbage generated by people is greatly increased, the harmless treatment of the garbage becomes a necessary choice, and the garbage incineration treatment becomes the existing mainstream garbage treatment mode due to the advantages of high reduction and harmless degree. However, nitrogen Oxides (NO) are generated during incineration of garbage X ) And the like, if the pollutants are directly discharged into the environment without being purified, the pollutants can cause bad influence on the ecological system. Therefore, the incineration of garbage is generally accompanied by the denitration of flue gas.
By flue gas denitration is meant that the NO produced is removed X Reduction to N 2 Or generating nitrate through neutralization reaction, thereby removing NO in the flue gas X . SNCR denitration is one of the technologies of flue gas denitration. The denitration performance can be ensured by calculating the outlet flue gas of the SNCR denitration system for SNCR denitration, but no effective outlet flue gas calculation method of the SNCR denitration system exists in the prior art.
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 at present.
In view of this, the first aspect of the present application provides a method for calculating outlet flue gas in an SNCR denitration system, including:
s1, determining flue gas data at an inlet of an SNCR (selective non catalytic reduction) denitration system;
s2, calculating a first reaction amount of preset flue gas in the denitration process of the SNCR denitration system 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, returning to the step S4 after taking the second total amount as a new first total amount.
Optionally, the smoke data comprises: o is 2 Content and dry smoke; the preset flue gas comprises: 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 flue gas amount;
and calculating a first reaction amount 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 formula (I), the compound is shown in the specification,
is O in dry flue gas at the inlet of an SNCR (selective non-catalytic reduction) denitration system in a standard state 2 The content of (A), (B), (C) and (C),
is O in dry flue gas at the inlet of an SNCR (selective non-catalytic reduction) denitration system in a standard state 2 Standard state volume, nm 3 (kg of refuse),
standard state volume, nm, of dry flue gas admitted to a standard state SNCR denitration system 3 /(kg garbage).
Optionally, the formula for calculating the first reaction amount is:
in the formula (I), the compound is shown in the specification,
for the first reaction quantity, nm, of NO in SNCR denitration systems 3 V (kg of waste),
is the standard state volume, nm, of NO at the outlet of the SNCR denitration system in the standard state 3 V (kg of waste),
is the standard state volume, nm, of NO at the inlet of the SNCR denitration system in the standard state 3 /(kg garbage).
Optionally, the outlet flue gas comprises: NO, NH 3 、O 2 、N 2 And H 2 O；
The step S3 specifically includes:
calculating a first total amount corresponding to NO in the outlet flue gas according to a first reaction amount corresponding to NO;
calculating NH in the outlet flue gas according to the first reaction amount corresponding to NO 3 、O 2 、N 2 And H 2 A 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 corresponding to the third reaction amount, and calculating NH in the outlet flue gas 3 、O 2 、N 2 And H 2 O each corresponding to a first total amount.
Optionally, calculating NH in the outlet flue gas 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 includes:
calculating NH in the outlet flue gas according to the first reaction amount corresponding to NO 3 Corresponding third reaction amount
Is composed of
According to the first reaction amount corresponding to NO, calculating O in the outlet flue gas 2 Corresponding third reaction amount
Is composed of
Calculating N in the outlet flue gas according to the first reaction amount corresponding to NO 2 Corresponding third generation amount
Is composed of
Calculating H in the outlet flue gas according to the first reaction amount corresponding to NO 2 Third generation amount corresponding to O
Is composed of
Optionally, the method is based on NH in the outlet flue gas 3 、O 2 、N 2 And H 2 O respectively corresponding to the third reaction amount, and calculating NH in the outlet flue gas 3 、O 2 、N 2 And H 2 The first total amount corresponding to each O specifically includes:
according to NH in the outlet flue gas 3 Third reaction amount of (3) and NH 3 Calculating the input amount of the flue gas in the outletNH 3 A first total amount of (a);
according to O in the outlet flue gas 2 And O and a third reaction amount of 2 Calculating O in the outlet flue gas 2 A first total amount of (c);
according to N in the outlet flue gas 2 Third generation amount of (2) and N 2 Calculating N in the outlet flue gas 2 A first total amount of (c);
according to H in the outlet flue gas 2 Third amount of O produced and H 2 The input amount of O is calculated, and H in the outlet flue gas is calculated 2 A first total amount of O.
The application provides in a second aspect a method for calculating an outlet flue gas in an SNCR denitration system, comprising:
the determination unit is used for determining the flue gas data at the inlet of the SNCR denitration system;
the first calculating unit is used for calculating a first reaction amount of preset flue gas in the denitration process of the SNCR denitration system according to the flue gas data at the inlet;
the second calculating unit is used for calculating a first total amount of outlet flue gas in the SNCR denitration system according to the first reaction amount;
the third calculating unit is used for calculating a second reaction amount of the outlet flue gas according to the first total amount;
the fourth calculating unit is used 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 flue gas is smaller than a preset threshold value, if so, the second total amount is used as the target total amount of the outlet flue gas, and if not, the third calculation unit is triggered after the second total amount is used as a new first total amount.
The third aspect of the application provides a calculating device for outlet flue gas in an SNCR denitration system, which comprises 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 any one of the calculation methods of the outlet flue gas in the SNCR denitration system according to the instructions in the program code.
A fourth aspect of the present application provides a computer-readable storage medium, which is used for storing a program code, where the program code is used for executing the method for calculating the outlet flue gas in the SNCR denitration system according to any one of the first aspects.
According to the technical scheme, the method has the following advantages:
the calculation method of the outlet flue gas in the SNCR denitration system comprises the following steps: s1, determining flue gas data at an inlet of an SNCR (selective non catalytic reduction) denitration system; s2, calculating a first reaction amount of preset flue gas in the denitration process of the SNCR denitration system 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, otherwise, taking the second total amount as a new first total amount, and returning to the step S4.
In the application, outlet flue gas in the SNCR denitration system is determined in an iterative calculation mode, at the initial iteration, flue gas data at the inlet of the SNCR denitration system is used as initial iteration data, the outlet flue gas in the SNCR denitration system is calculated through the initial iteration data, after the initial iteration is completed, the outlet flue gas obtained through the initial iterative calculation is used as the iteration data to calculate the outlet flue gas in the SNCR denitration system, when the difference value of the outlet flue gas obtained twice in the adjacent process is smaller than a preset threshold value, the algorithm is explained to be converged, the data of the outlet flue gas obtained through calculation at the moment is actual data (namely target data) of the outlet flue gas, calculation of the outlet flue gas in the SNCR denitration system is achieved, and the technical problem that the outlet flue gas of the SNCR denitration system cannot be 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 used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a schematic flowchart of a first embodiment of a method for calculating outlet flue gas in an SNCR denitration system according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of a second embodiment of a method for calculating outlet flue gas in an SNCR denitration system according to the present application;
fig. 3 is a schematic structural diagram of an embodiment of a computing apparatus for calculating 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, realizes calculation of the outlet flue gas in the SNCR denitration system, and solves the technical problem that the outlet flue gas of the SNCR denitration system cannot be effectively calculated in the prior art.
In order to make the objects, features and advantages of the present invention more apparent and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the embodiments described below are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic flow chart of a first embodiment of a method for calculating outlet flue gas in an SNCR denitration system according to the present disclosure.
In this embodiment, a method for calculating outlet flue gas in an SNCR denitration system may specifically include the steps of:
Although the SNCR denitration system is positioned in a reaction window temperature area in a hearth, namely the hearth, for simplifying calculation and facilitating understanding, the SNCR denitration system is distinguished from a combustion process in the hearth and is regarded as an independent system, outlet flue gas of the hearth is inlet flue gas of the SNCR denitration system, and parameters such as temperature and pressure are regarded as unchanged.
According to the definition of the removal efficiency, the converted concentration of the dry flue gas at the outlet of the SNCR denitration system can be deduced by combining the known converted concentration of the dry flue gas at the inlet of the SNCR denitration system as follows:
However, only knowing the reduced concentration of NO at the outlet of the SNCR denitration system does not allow direct calculation of the actual concentration and the standard state volume, mass, molar mass, etc., and further requires replenishment of O at the outlet 2 Content and dry smoke amount, etc. And O at the outlet 2 The content and the dry flue gas amount can be calculated according to parameters such as standard state volume, mass, molar mass 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, the data of the outlet flue gas is not determined at the beginning of calculation, but the flue gas data of the inlet flue gas is known, so that the flue gas data at the inlet of the SNCR denitration system is determined at first in this embodiment, and the calculation of the related data of the initial outlet flue gas is performed through the flue gas data at the inlet subsequently.
102, calculating a first reaction amount 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 the inlet, the first reaction amount of the preset flue gas in the denitration process of the SNCR denitration system can be calculated.
And 103, calculating a first total amount of outlet flue gas in the SNCR denitration system according to the first reaction amount.
After the first reaction amount of the preset flue gas in the SNCR denitration system is obtained, the first total amount of the outlet flue gas in the SNCR denitration system can be calculated.
And 104, calculating a second reaction amount of the outlet flue gas according to the first total amount.
And calculating to obtain a second reaction amount of the outlet flue gas according to the first total amount of the outlet flue gas and the input amount of the inlet flue gas.
And 105, calculating a second total amount of the outlet flue gas according to the second reaction amount.
And 106, 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, returning to the step 104 after taking the second total amount as a new first total amount.
And 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, which indicates that the algorithm is converged, and the calculated second total amount can be used as the target total amount of the outlet flue gas.
It can be understood that the size of the preset threshold may be set according to needs, which is not specifically defined and described in this embodiment.
In the embodiment, outlet flue gas in the SNCR denitration system is determined by means of iterative computation, at the initial iteration, flue gas data at an inlet of the SNCR denitration system is used as initial iteration data, the outlet flue gas in the SNCR denitration system is computed by the initial iteration data, after the initial iteration is completed, the outlet flue gas obtained by the initial iterative computation is used as the iteration data to compute the outlet flue gas in the SNCR denitration system, when a difference value between two adjacent outlet flue gases is smaller than a preset threshold value, the algorithm is explained to be converged, at this time, the computed outlet flue gas data is actual data (namely target data) of the outlet flue gas, the computation of the outlet flue gas in the SNCR denitration system is realized, and the technical problem that the outlet flue gas of the existing SNCR denitration system is not effectively computed is solved.
Referring to fig. 2, fig. 2 is a flowchart illustrating a second embodiment of a method for calculating outlet flue gas in an SNCR denitration system according to the present application.
In this embodiment, a method for calculating outlet flue gas in an SNCR denitration system may specifically include the steps of:
Considering that the conditions of the smoke at the inlet and the outlet of the SNCR are relatively approximate, the O at the inlet of the SNCR is determined 2 Content and dry flue gas quantity as initial data for iteration, it is understood that O at the inlet 2 The calculation formula of the content is as follows:
in the formula (I), the compound is shown in the specification,
is O in dry flue gas at the inlet of an SNCR (selective non-catalytic reduction) denitration system in a standard state 2 The contents,%,
is O in dry flue gas at the inlet of an SNCR (selective non-catalytic reduction) denitration system in a standard state 2 Standard state volume, nm 3 (kg of refuse),
is the standard state volume, nm, of dry flue gas at the inlet of the SNCR denitration system under the standard state 3 /(kg garbage).
202, according to O at the inlet 2 And (4) calculating the standard state volume of NO at the outlet of the SNCR denitration system according to the content and the dry flue gas 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 formula (I), the compound is shown in the specification,
is the standard state volume, nm, of NO in the outlet of the SNCR denitration system under standard state 3 V (kg of waste),
is the actual concentration of NO in the dry flue gas at the outlet of the SNCR denitration system under the standard state, mg/Nm 3 ，V m For the gas molar volume constant, the value is generally taken to be an approximation of 22.4, L/mol, M NO Is the molar mass of NO, g/mol,
for the standard state volume of the dry flue gas exiting the SNCR denitration system under standard conditions, the values determined in step 201, nm, are initially substituted iteratively 3 /(kg garbage).
Specifically, the actual concentration of NO in the dry flue gas at the outlet of the SNCR denitration system under the standard state
in the formula (I), the compound is shown in the specification,
is the converted concentration of NO in dry flue gas at the outlet of an SNCR denitration system under a standard state, mg/Nm 3 ，
Is O in dry flue gas at the outlet of an SNCR (selective non-catalytic reduction) denitration system in a standard state 2 Content, the values of the corresponding parameters at the inlet (i.e., the values determined by step 201), are initially substituted for iteration%,.
And step 203, calculating a first reaction amount 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 formula (I), the compound is shown in the specification,
for the first reaction quantity, nm, of NO in SNCR denitration systems 3 V (kg of waste),
is the standard state volume, nm, of NO at the outlet of the SNCR denitration system in the standard state 3 (kg of refuse),
is the standard state volume, nm, of NO at the inlet of the SNCR denitration system in the standard state 3 /(kg garbage).
And 204, calculating a first total amount corresponding to NO in the outlet flue gas according to the first reaction amount corresponding to NO.
It is to be understood that at the beginning of the iteration, the first total amount corresponding to NO is equal to the first reaction amount corresponding to NO.
It can be understood that 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 includes:
calculating NH in the outlet flue gas according to the first reaction amount corresponding to NO 3 Corresponding third reaction amount
Is composed of
According to the first reaction amount corresponding to NO, O in the outlet flue gas is calculated 2 Corresponding third reaction amount
Is composed of
Calculating N in the outlet flue gas according to the first reaction amount corresponding to NO 2 Corresponding third generation amount
Is composed of
According to the first reaction amount corresponding to NO, H in the outlet flue gas is calculated 2 Third generation amount corresponding to O
Is composed of
It will be appreciated that in a chemical reaction, a reaction involving a substance necessarily involves the formation of another substance.
206, according to NH in the outlet flue gas 3 、O 2 、N 2 And H 2 The third reaction amount corresponding to each O is calculated to obtain NH in the outlet flue gas 3 、O 2 、N 2 And H 2 O each corresponds to a first total amount.
According to NH in outlet flue gas 3 、O 2 、N 2 And H 2 The third reaction amount corresponding to each O is calculated to obtain NH in the outlet flue gas 3 、O 2 、N 2 And H 2 The first total amount corresponding to each O specifically includes:
according to NH in outlet flue gas 3 Third reaction amount of (3) and NH 3 Calculating NH in the outlet flue gas 3 A first total amount of (a);
according to O in outlet flue gas 2 And O and a third reaction amount of 2 Calculating O in the outlet flue gas 2 A first total amount of (c);
according to N in outlet flue gas 2 Third generation amount of (2) and N 2 Calculating N in the outlet flue gas 2 A first total amount of (c);
according to H in the outlet flue gas 2 Third amount of O produced and H 2 The input amount of O is calculated to obtain H in the outlet flue gas 2 A first total amount of O.
Besides the flue gas, the imported materials of the SNCR denitration system also comprise ammonia water solution sprayed by a spray gun and compressed gas of the atomized ammonia water solution. According to the definition of ammonia nitrogen molar ratio, knowing the standard state volume of NO in the inlet flue gas, the total NH in the ammonia water solution fed into the SNCR denitration system can be calculated 3 ·H 2 Standard state volume of O
(unit Nm) 3 V (kg waste)) and quality
(in kg/(kg waste)) is:
in the formula (I), the compound is shown in the specification,
the ammonia nitrogen molar ratio can be adjusted and controlled, and has no dimension,
is NH 3 ·H 2 Molar mass of O, g/mol.
The concentration of ammonia water used in SNCR denitration system is generally constant, and the reference literature in the embodiment is selected to be 10% (weight ratio), so that ammonia water solution can be obtained
The mass of the method is as follows:
the other main component in the ammonia solution is water, and the quality of water fed into the SNCR denitration system can be deduced by neglecting other minor components
And standard state volume
Comprises the following steps:
in the formula (I), the compound is shown in the specification,
is H 2 Molar mass of O, g/mol.
The above-mentioned related parameters such as the calculated volume of the aqueous ammonia solution are values existing in a gaseous state in a standard state, and actually the aqueous ammonia is not in a gaseous state in a standard state, and even exists in a liquid state during the reaction. Because the mass concentration of the ammonia solution is known, the density is known to be 0.895g/cm < 3 > by looking up a table, and the actual volume V can be deduced Aqueous ammonia solution (unit is m) 3 /(kg garbage)) is calculated as:
the ammonia water solution is sprayed into the SNCR denitration system through a spray gun, and in order to enable the solution and the flue gas to be mixed uniformly and fully, gas is sprayed together to achieve the effect of atomizing the solution. The specific available gas types are compressed air, nitrogen and the like; the amount of gas specifically sprayed in can be regulated and controlled, and the atomization effect can be influenced so as to indirectly influence the removal efficiency.
The commonly used gas is compressed air, the dosage is related to the actual volume of the ammonia solution, and the gas-liquid volume ratio is set to be 3 (standard state volume). The amount of compressed air charged to the SNCR knock-out system can be deduced
(unit is Nm) 3 /(kg garbage)) is:
correspondingly, NH in the outlet flue gas 3 The first total amount of
O in the outlet flue gas 2 The first total amount of
N in the outlet flue gas 2 The first total amount of (A) is
H in the outlet flue gas 2 The first total amount of O is
And step 207, calculating a second reaction amount of the outlet flue gas according to the first total amount.
And 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 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 a new first total amount, and returning to step 207.
In the embodiment, outlet flue gas in the SNCR denitration system is determined by means of iterative computation, at the initial iteration, flue gas data at an inlet of the SNCR denitration system is used as initial iteration data, the outlet flue gas in the SNCR denitration system is computed by the initial iteration data, after the initial iteration is completed, the outlet flue gas obtained by the initial iterative computation is used as the iteration data to compute the outlet flue gas in the SNCR denitration system, when a difference value between two adjacent outlet flue gases is smaller than a preset threshold value, the algorithm is explained to be converged, at this time, the computed outlet flue gas data is actual data (namely target data) of the outlet flue gas, the computation of the outlet flue gas in the SNCR denitration system is realized, and the technical problem that the outlet flue gas of the existing SNCR denitration system is not effectively computed is solved.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an embodiment of a calculating apparatus for calculating outlet flue gas in an SNCR denitration system according to an embodiment of the present disclosure.
In this embodiment, a calculating device for outlet flue gas in SNCR denitration system may specifically include:
the determination unit is used for determining the flue gas data at the inlet of the SNCR denitration system;
the first calculating unit is used for calculating a first reaction amount of preset flue gas in the denitration process of the SNCR denitration system according to the flue gas data at the inlet;
the second calculating unit is used for calculating a first total amount of outlet flue gas in the SNCR denitration system according to the first reaction amount;
the third calculating unit is used for calculating a second reaction amount of the outlet flue gas according to the first total amount;
the fourth calculating unit is used 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 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, triggering the third calculation unit after taking the second total amount as the new first total amount.
Optionally, the smoke data comprises: o is 2 Content and dry smoke gas content; presetting the flue gas comprises: NO;
the method for calculating the first reaction amount of the preset flue gas in the denitration process of the SNCR denitration system according to the flue gas data at the inlet specifically comprises the following steps:
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 flue gas quantity;
and calculating the first reaction amount 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 formula (I), the compound is shown in the specification,
is O in dry flue gas at the inlet of an SNCR (selective non-catalytic reduction) denitration system in a standard state 2 The contents,%,
is O in dry flue gas at the inlet of an SNCR (selective non-catalytic reduction) denitration system in a standard state 2 Standard state body ofProduct, nm 3 (kg of refuse),
standard state volume, nm, of dry flue gas admitted to a standard state SNCR denitration system 3 /(kg garbage).
Specifically, the calculation formula of the first reaction amount is:
in the formula (I), the compound is shown in the specification,
for the first reaction quantity, nm, of NO in SNCR denitration systems 3 V (kg of waste),
is the standard state volume, nm, of NO at the outlet of the SNCR denitration system in the standard state 3 (kg of refuse),
is the standard state volume, nm, of NO at the inlet of the SNCR denitration system in the standard state 3 /(kg garbage).
Preferably, the outlet flue gas comprises: NO, NH 3 、O 2 、N 2 And H 2 O；
According to the first reaction amount, calculating a first total amount of the outlet flue gas in the SNCR denitration system specifically comprises the following steps:
calculating a first total amount corresponding to NO in the outlet flue gas according to the first reaction amount corresponding to NO;
calculating NH in the outlet flue gas according to the first reaction amount corresponding to NO 3 、O 2 、N 2 And H 2 A third reaction amount corresponding to each O;
according to NH in outlet flue gas 3 、O 2 、N 2 And H 2 The third reaction amount corresponding to each O is calculated to obtain NH in the outlet flue gas 3 、O 2 、N 2 And H 2 O each corresponding to a first total amount.
Optionally, calculating NH in the outlet flue gas 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 includes:
calculating NH in outlet flue gas according to the first reaction amount corresponding to NO 3 Corresponding third reaction amount
Is composed of
According to the first reaction amount corresponding to NO, O in the outlet flue gas is calculated 2 Corresponding third reaction amount
Is composed of
According to the first reaction amount corresponding to NO, N in the outlet flue gas is calculated 2 Corresponding third generation amount
Is composed of
According to the first reaction amount corresponding to NO, H in the outlet flue gas is calculated 2 Third generation amount corresponding to O
Is composed of
In particular, according to NH in the outlet flue gas 3 、O 2 、N 2 And H 2 The third reaction amount corresponding to each O is calculated to obtain NH in the outlet flue gas 3 、O 2 、N 2 And H 2 The first total amount corresponding to each O specifically includes:
according to NH in outlet flue gas 3 Third reaction amount of (3) and NH 3 Calculating NH in the outlet flue gas 3 A first total amount of (a);
according to O in the outlet flue gas 2 And O and a third reaction amount of 2 Calculating O in the outlet flue gas 2 A first total amount of (c);
according to N in outlet flue gas 2 Third generation amount of (2) and N 2 Calculating N in the outlet flue gas 2 A first total amount of (c);
according to H in the outlet flue gas 2 Third amount of O produced and H 2 The input amount of O is calculated to obtain H in the outlet flue gas 2 A first total amount of O.
In the embodiment, outlet flue gas in the SNCR denitration system is determined by means of iterative computation, at the initial iteration, flue gas data at an inlet of the SNCR denitration system is used as initial iteration data, the outlet flue gas in the SNCR denitration system is computed by the initial iteration data, after the initial iteration is completed, the outlet flue gas obtained by the initial iterative computation is used as the iteration data to compute the outlet flue gas in the SNCR denitration system, when a difference value between two adjacent outlet flue gases is smaller than a preset threshold value, the algorithm is explained to be converged, at this time, the computed outlet flue gas data is actual data (namely target data) of the outlet flue gas, the computation of the outlet flue gas in the SNCR denitration system is realized, and the technical problem that the outlet flue gas of the existing SNCR denitration system is not effectively computed 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 used for executing the calculation method of the outlet flue gas in the SNCR denitration system according to the instructions in the program code.
An embodiment of the present application further provides an embodiment of a computer-readable storage medium, where the computer-readable storage medium is used to store a program code, and the program code is used to execute the method for calculating the outlet flue gas in the SNCR denitration system according to the foregoing embodiment.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The embodiments in the present specification are all described in a progressive manner, and each embodiment focuses on differences from other embodiments, and portions that are the same and similar between the embodiments may be referred to each other.
As will be appreciated by one of skill in the art, embodiments of the present application may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present application 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 embodied on one or more computer-usable computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, 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 terminal 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 terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal 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 application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or terminal device that comprises the element.
The above embodiments are only used for illustrating the technical solutions 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A calculation method of outlet flue gas in an SNCR denitration system is characterized by comprising the following steps:
s1, determining flue gas data at an inlet of an SNCR (selective non catalytic reduction) denitration system;
s2, calculating a first reaction amount of preset flue gas in the denitration process of the SNCR denitration system 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, returning to the step S4 after taking the second total amount as a new first total amount.
2. The method for calculating the outlet flue gas in the SNCR denitration system of claim 1, wherein the flue gas data comprises: o is 2 Content and dry smoke; the preset flue gas comprises: 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 flue gas amount;
and calculating a first reaction amount 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 the SNCR denitration system according to claim 2, wherein O at the inlet 2 The calculation formula of the content is as follows:
in the formula (I), the compound is shown in the specification,
is O in dry flue gas at the inlet of an SNCR (selective non-catalytic reduction) denitration system in a standard state 2 The contents,%,
is O in dry flue gas at the inlet of an SNCR (selective non-catalytic reduction) denitration system in a standard state 2 Standard state volume, nm 3 V (kg of waste),
is the standard state volume, nm, of dry flue gas at the inlet of the SNCR denitration system under the standard state 3 /(kg garbage).
4. The method for calculating the outlet flue gas in the SNCR denitration system according to claim 3, wherein the formula for calculating the first reaction amount is as follows:
in the formula (I), the compound is shown in the specification,
for the first reaction quantity, nm, of NO in SNCR denitration systems 3 V (kg of waste),
is the standard state volume, nm, of NO at the outlet of the SNCR denitration system in the standard state 3 /(kg garbage)
Is the standard state volume, nm, of NO at the inlet of the SNCR denitration system in the standard state 3 /(kg garbage).
5. The calculating method for the outlet flue gas in the SNCR denitration system of claim 2, wherein the outlet flue gas comprises: NO, NH 3 、O 2 、N 2 And H 2 O；
The step S3 specifically includes:
calculating a first total amount corresponding to NO in the outlet flue gas according to a first reaction amount corresponding to NO;
calculating NH in the outlet flue gas according to the first reaction amount corresponding to NO 3 、O 2 、N 2 And H 2 A 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 corresponding to the third reaction amount, and calculating NH in the outlet flue gas 3 、O 2 、N 2 And H 2 O each corresponds to a first total amount.
6. The method for calculating the outlet flue gas in the SNCR denitration system according to claim 5, wherein 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 includes:
calculating NH in the outlet flue gas according to the first reaction amount corresponding to NO 3 Corresponding third reaction amount
Is composed of
According to the first reaction amount corresponding to NO, calculating O in the outlet flue gas 2 Corresponding third reaction amount
Is composed of
Calculating N in the outlet flue gas according to the first reaction amount corresponding to NO 2 Corresponding third generation amount
Is composed of
According to the first reaction amount corresponding to NO, H in the outlet flue gas is calculated 2 Third generation amount corresponding to O
Is composed of
7. The calculating method for outlet flue gas in SNCR (selective non-catalytic reduction) denitration system according to claim 6, wherein the calculation method is based on NH in the outlet flue gas 3 、O 2 、N 2 And H 2 O respectively corresponding to the third reaction amount, and calculating NH in the outlet flue gas 3 、O 2 、N 2 And H 2 The first total amount corresponding to each O specifically includes:
according to NH in the outlet flue gas 3 Third reaction amount of (3) and NH 3 Calculating NH in the outlet flue gas 3 A first total amount of (a);
according to O in the outlet flue gas 2 And O and a third reaction amount of 2 Calculating O in the outlet flue gas 2 A first total amount of (c);
according to N in the outlet flue gas 2 Third generation amount of (2) and N 2 Calculating N in the outlet flue gas 2 A first total amount of (c);
according to H in the outlet flue gas 2 Third amount of O produced and H 2 The input amount of O is calculated, and H in the outlet flue gas is calculated 2 A first total amount of O.
8. A computational device of export flue gas among SNCR deNOx systems, characterized by includes:
the determination unit is used for determining the flue gas data at the inlet of the SNCR denitration system;
the first calculating unit is used for calculating a first reaction amount of preset flue gas in the denitration process of the SNCR denitration system according to the flue gas data at the inlet;
the second calculating unit is used for calculating a first total amount of outlet flue gas in the SNCR denitration system according to the first reaction amount;
the third calculating unit is used for calculating a second reaction amount of the outlet flue gas according to the first total amount;
the fourth calculating unit is used 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 flue gas is smaller than a preset threshold value, if so, the second total amount is used as the target total amount of the outlet flue gas, and if not, the third calculation unit is triggered after the second total amount is used as a new first total amount.
9. The calculating equipment for the outlet flue gas in the SNCR denitration system is characterized by 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 used for executing the calculation method of the outlet flue gas in the SNCR denitration system according to the instructions in the program codes, wherein the calculation method is as defined in any one of claims 1 to 7.
10. A computer-readable storage medium for storing a program code for executing the method for calculating an outlet flue gas in an SNCR denitration system according to any one of claims 1 to 7.
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