CN106202981B - A kind of smoke components calculation method of oxygen-enriched boiler - Google Patents

A kind of smoke components calculation method of oxygen-enriched boiler Download PDF

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Publication number
CN106202981B
CN106202981B CN201610720370.1A CN201610720370A CN106202981B CN 106202981 B CN106202981 B CN 106202981B CN 201610720370 A CN201610720370 A CN 201610720370A CN 106202981 B CN106202981 B CN 106202981B
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oxygen
air
content
smoke components
flue gas
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CN106202981A (en
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周宏宝
廖海燕
王俊
王鹏
吴海波
刘毅
卢权
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SHENHUA GUOHUA (BEIJING) ELECTRIC POWER RESEARCH INSTITUTE Co Ltd
China Shenhua Energy Co Ltd
Beijing Guohua Electric Power Co Ltd
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SHENHUA GUOHUA (BEIJING) ELECTRIC POWER RESEARCH INSTITUTE Co Ltd
China Shenhua Energy Co Ltd
Beijing Guohua Electric Power Co Ltd
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    • G16INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
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Abstract

The present invention relates to boiler hot mechanics fields, disclose a kind of smoke components calculation method of oxygen-enriched boiler, which includes:Detect the operating condition of the oxygen-enriched boiler;And in the case where the operating condition meets boundary parameter requirement, the smoke components of oxygen-enriched boiler each point are calculated;Wherein, the smoke components for calculating oxygen-enriched boiler each point include:The air preheater exiting flue gas ingredient of oxygen-enriched boiler is calculated in conjunction with the air preheater air leakage rate of oxygen-enriched boiler.The present invention is in the calculating of oxygen-enriched boiler smoke loop iteration, fully consider various situations of leaking out present in oxygen-enriched boiler field engineering, the especially influence of air preheater leaked out to entirely iterating to calculate, it simulates the reality of oxygen-enriched boiler field engineering as far as possible, calculates to degree of precision the smoke components under oxygen-enriched boiler actual condition.

Description

A kind of smoke components calculation method of oxygen-enriched boiler
Technical field
The present invention relates to boiler hot mechanics fields, and in particular, to a kind of smoke components calculation method of oxygen-enriched boiler.
Background technique
Oxygen-enriched combusting refers to that one kind replaces helping on the basis of existing coal-fired power generator set with pure oxygen or oxygen-enriched gas mixtures Air is fired, realizes the technology that fossil fuel low-carbon utilizes.By flue gas recirculation, CO2 content be can reach in the dry flue gas that burns 80% or more, it can reach 95% or more using compression purification process, to meet the needs of extensive pipeline and storage.
For oxygen-enriched combusting due to using oxygen as combustion adjuvant, smoke components are different from conventional boiler, and a large amount of flue gas carries out Recycling, and air and gas system be closed cycle, system leak out and the exchange of air preheater flue gas will seriously affect combustion adjuvant in furnace Ingredient, these cause the difficulty for calculating the smoke components of oxygen-enriched boiler.In this regard, the prior art is in the cigarette for calculating oxygen-enriched boiler When gas ingredient, do not consider usually system leak out and influence of the exchange of air preheater flue gas to smoke components, even in theory In the case of calculate smoke components, the calculated result obtained accordingly and actual conditions are not met simultaneously, to join based on thermodynamic computing When number (including smoke components) design boiler, the accuracy of boiler design will affect.
Summary of the invention
The object of the present invention is to provide a kind of smoke components calculation method of oxygen-enriched boiler, for solve in the prior art into The smoke components of the oxygen-enriched boiler of row do not consider when calculating system leak out and influence of the exchange of air preheater flue gas to smoke components The problem of.
To achieve the goals above, the present invention provides a kind of smoke components calculation method of oxygen-enriched boiler, the smoke components Calculation method includes:Detect the operating condition of the oxygen-enriched boiler;And meet boundary parameter requirement in the operating condition In the case of, calculate the smoke components of oxygen-enriched boiler each point;Wherein, the smoke components for calculating oxygen-enriched boiler each point include:Knot The air preheater air leakage rate for closing oxygen-enriched boiler calculates the air preheater exiting flue gas ingredient of oxygen-enriched boiler.
Preferably, the boundary parameter includes air air leak rate of air curtain, crosses oxygen quotient, circulating ratio, enter burner hearth partial pressure of oxygen, is primary One or more of wind oxygen wind pressure, First air oxygen concentration and First air note oxygen amount.
Preferably, the air preheater air leakage rate of the oxygen-enriched boiler of the combination calculates the air preheater exiting flue gas ingredient of oxygen-enriched boiler Including:If the air preheater is tube-type air preheater, the furnace outlet cigarette of the air preheater exiting flue gas ingredient and oxygen-enriched boiler Gas ingredient is identical;If the air preheater be Junker formula air preheater, be calculated using the following equation the air preheater exiting flue gas at Point:
Vx KYQ=Vx LT+L1 KYVx 11+L2 KYVx 21
In formula, Vx KYQIndicate the content of each gas in air preheater exiting flue gas ingredient, Vx LTIndicate furnace outlet flue gas ingredient In each gas content, L1 KYAnd L2 KYThe respectively air preheater air leakage rate of First air and Secondary Air relative to air preheater, Vx 11With Vx 21It is each in the content of each gas respectively in the smoke components of primary air fan entrance and the smoke components of secondary air fan entrance The content of gas, it includes carbon dioxide, sulfur dioxide, water vapour, oxygen, nitrogen and argon that wherein subscript x, which indicates each gas, Gas.
Preferably, the smoke components for calculating oxygen-enriched boiler each point further include:It is calculated using the following equation oxygen-enriched boiler Furnace outlet flue gas ingredient,
VCO2 LT=VCO2°+VCO2 12+VCO2 22
VSO2 LT=VSO2°+VSO2 12+VSO2 22
VH2O LT=VH2O°+VH2O 12+VH2O 22
VO2 LT=VO2°×(αOX-1);
VN2 LT=VN2°+VN2 12+VN2 22
VAr LT=VAr 12+VAr 22
In formula, VCO2 LT、VCO2°、VCO2 12And VCO2 22Respectively indicate the carbon dioxide content of furnace outlet, theory needs dioxy Change carbon content, primary air fan outlet carbon dioxide content and secondary air fan and exports carbon dioxide content;VSO2 LT、VSO2°、VSO2 12With VSO2 22Respectively indicate the content of sulfur dioxide of furnace outlet, theory needs content of sulfur dioxide, primary air fan outlet sulfur dioxide Content and secondary air fan export content of sulfur dioxide;VH2O LT、VH2O°、VH2O 12And VH2O 22Respectively indicate the water vapour of furnace outlet Content, theory need vapour content, primary air fan outlet vapour content and secondary air fan outlet vapour content;VO2 LT、 VO2°、αOXRespectively indicate the oxygen content of furnace outlet, theory needs to cross oxygen quotient in oxygen content and the boundary parameter; VN2 LT、VN2°、VN2 12And VN2 22Respectively indicate nitrogen content of furnace outlet, theory needs nitrogen content, primary air fan outlet nitrogen Gas content and secondary air fan export nitrogen content;VAr LT、VAr 12And VAr 22Respectively indicate argon content, the First air of furnace outlet Machine exports argon content and secondary air fan exports argon content.
Preferably, the smoke components for calculating oxygen-enriched boiler each point further include:It is calculated using the following equation oxygen-enriched boiler Air-introduced machine inlet flue gas ingredient,
VCO2 YFJ=VCO2 KYQ
VSO2 YFJ=VSO2 KYQ
VH2O YFJ=VH2O KYQ+VH2O kq
VO2 YFJ=VO2 KYQ+VO2 kq
VN2 YFJ=VN2 KYQ+VN2 kq
VAr YFJ=VAr KYQ
VH2O kq+VO2 kq+VN2 kqLFVLT
In formula, VCO2 YFJ、VSO2 YFJ、VH2O YFJ、VO2 YFJ、VN2 YFJAnd VAr YFJIt respectively indicates in air-introduced machine inlet flue gas ingredient The content of carbon dioxide, sulfur dioxide, water vapour, oxygen, nitrogen and argon gas, VCO2 KYQ、VSO2 KYQ、VH2O KYQ、VO2 KYQ、VN2 KYQWith VAr KYQRespectively indicate carbon dioxide in air preheater exiting flue gas ingredient, sulfur dioxide, water vapour, oxygen, nitrogen and argon gas Content, VH2O kq、VO2 kqAnd VN2 kqThe content of water vapour in the flue gas for leaking into air-introduced machine entrance, oxygen and nitrogen is respectively indicated, αLFIndicate air air leak rate of air curtain, VLTIndicate total flue gas volume of furnace outlet.
Preferably, the smoke components for calculating oxygen-enriched boiler each point further include:Calculate the cigarette after the condensation of oxygen-enriched boiler Gas ingredient, and smoke components are identical as the air-introduced machine inlet flue gas ingredient after the condensation.
Preferably, the smoke components for calculating oxygen-enriched boiler each point further include:Calculate the circulating flue gas of oxygen-enriched boiler Smoke components, the smoke components of flue gas of discharging fume, the smoke components of a secondary air fan entrance and air preheater export a Secondary Air Smoke components.
Preferably, which further includes:According to the flue gas of the calculated oxygen-enriched boiler each point at Point, the smoke components of the calculating oxygen-enriched boiler each point account for the volume share of total flue gas volume of the oxygen-enriched boiler.
Preferably, which further includes:It is accounted for according to the smoke components of the oxygen-enriched boiler each point described The volume share of total flue gas volume of oxygen-enriched boiler, calculates smoke density and flue gas mass.
Through the above technical solutions, the beneficial effects of the invention are as follows:The present invention is calculated in oxygen-enriched boiler smoke loop iteration In, fully consider leaking out to entire iteration for various situations of leaking out, especially air preheater present in oxygen-enriched boiler field engineering The influence of calculating simulates the reality of oxygen-enriched boiler field engineering as far as possible, calculates to degree of precision the practical work of oxygen-enriched boiler Smoke components under condition.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
The drawings are intended to provide a further understanding of the invention, and constitutes part of specification, with following tool Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the flue gas recirculation logic of oxygen-enriched boiler in the present invention;
Fig. 2 is the flow diagram of the smoke components calculation method of the oxygen-enriched boiler of the embodiment of the present invention.
Specific embodiment
Below in conjunction with attached drawing, detailed description of the preferred embodiments.It should be understood that this place is retouched The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
Smoke components calculating in oxygen-enriched boiler is the basis of other thermodynamic computings of furnace heat transfer and boiler, in the prior art It is typically based on boiler system and the smoke components calculating that the theoretical case leaked out carries out oxygen-enriched boiler is not present, but in oxygen-enriched boiler In practical flue gas recirculation iterative process, there are various situations of leaking out.Based on this, the present invention proposes the flue gas in oxygen-enriched boiler Loop iteration process fully considers that various situations of leaking out, especially air existing for field engineering leak out and air preheater air leakage pair The influence of entire flue gas recirculation iteration.As shown in Figure 1, which show the flue gas recirculation logics of oxygen-enriched boiler of the invention, specifically For:It is sent into combustion oxygen by primary air fan, and circulating flue gas is sent by secondary air fan, combustion oxygen and circulating flue gas lead to again It crosses air-introduced machine and is sent into air preheater, after air preheater obtains oxygen and circulating flue gas, be sent to burner hearth with the same feeding burner hearth that burns Fuel, hearth combustion and generate flue gas, as smoke evacuation flue gas, smoke evacuation flue gas has also been included in air now and has leaked out and empty the flue gas Pre- device leaks out, and discharges fume flue gas after a series of processing such as flue gas condensing, part of smoke is discharged, another part flue gas is then made For circulating flue gas, reinjects after oxygen and burner hearth is re-fed by air preheater, be finally reached equilibrium state.
On the basis of above-mentioned flue gas recirculation logic of the invention, the embodiment provides a kind of oxygen-enriched boilers Smoke components calculation method, be used for calculate the flue gas of oxygen-enriched boiler each point when flue gas recirculation logic reaches equilibrium state at Point.As shown in Fig. 2, the smoke components calculation method includes:
Step S1 detects the operating condition of the oxygen-enriched boiler.
In the present embodiment, the step S1 detects the purpose of the operating condition of oxygen-enriched boiler, is to meet operating condition Preconfigured boundary parameter.The boundary parameter refers to should meet in the oxygen-enriched smoke components calculating process with the present embodiment The relevant parameter of boundary condition, and smoke components can have an impact the operating condition of oxygen-enriched boiler, and in operating condition Temperature parameter etc. is also required to meet its corresponding boundary condition, therefore can be come by the operating condition of the oxygen-enriched boiler of real-time detection Guarantee that calculating the process of smoke components is carried out under the premise of meeting boundary parameter requirement.
In the present embodiment, the boundary parameter that oxygen-enriched boiler smoke ingredient calculates mainly is included one or more of the following.
1, oxygen quotient is crossed
It crosses oxygen quotient to be determined by actual conditions, in the oxygen-enriched combusting of the present embodiment calculates, crosses oxygen quotient and be preferably determined as 1.15。
2, air air leak rate of air curtain
It needs to consider the case where air leaks into boiler internal in boiler operatiopn in the present embodiment, therefore sets air leakage Wind rate, air air leak rate of air curtain index is related with boiler operatiopn negative pressure and Equip- ment manufacture and installation index, in the present embodiment, oxygen-enriched combusting mistake Air air leak rate of air curtain in journey is preferably 2%, and maximum is no more than 5%.
3, circulating ratio
In the present embodiment, the oxygen concentration (percentage of oxygen gas component i.e. in circulating flue gas in burner hearth circulating flue gas is sent into meet Than content) reach based on setting numerical value and determines circulating ratio, therefore originally need to provide the hypothesis of circulating ratio calculating Value, and constantly adjustment circulating ratio value is to meet above-mentioned requirements.
4, enter burner hearth partial pressure of oxygen
In the present embodiment, it can be obtained by related experiment and most preferably to enter burner hearth partial pressure of oxygen, and controlled by adjusting circulating ratio Enter burner hearth partial pressure of oxygen described in system, general control 26% -29%, preferably 26% because by related experiment it is provable enter furnace Thorax partial pressure of oxygen is closest compared with conventional boiler combustion characteristics at 26%.
5, First air partial pressure of oxygen
In view of First air infuses oxygen safety, the present embodiment is preferably that First air partial pressure of oxygen is 18%.
In addition, formulated in conjunction with industry《Boiler thermodynamic calculation standard》, may also need to be set according to the regulation of the standard Remaining boundary parameter, those skilled in the art can select remaining boundary to join according to thermodynamic computing standard, boiler actual condition Number, it will be not going to repeat.
Step S2 calculates the smoke components of oxygen-enriched boiler each point in the case where meeting the boundary parameter requirement.
In the present embodiment, the smoke components are primarily referred to as carbon dioxide in flue gas CO2, sulfur dioxide SO2, water vapour H2O, oxygen O2, nitrogen N2With the content of argon Ar.Also, the smoke components of the oxygen-enriched boiler each point mainly go out including burner hearth The cigarette of smoke components, circulating flue gas after mouth smoke components, air preheater exiting flue gas ingredient, air-introduced machine inlet flue gas ingredient, condensation Gas ingredient, the smoke components of flue gas of discharging fume, the smoke components of a secondary air fan entrance and air preheater export the cigarette of a Secondary Air Gas ingredient.Wherein, particularly, the smoke components for calculating oxygen-enriched boiler each point include the air preheater air leakage in conjunction with oxygen-enriched boiler Rate calculates the air preheater exiting flue gas ingredient of oxygen-enriched boiler, and specific calculating process is described below.
The detailed process that the smoke components of oxygen-enriched boiler each point calculate is introduced separately below.
1, furnace outlet flue gas ingredient
Furnace outlet flue gas ingredient is represented by Vx LT, wherein subscript LT indicates that burner hearth, subscript x indicate CO2、SO2、H2O、 O2、N2And Ar.
In the present embodiment, it is preferred to use following formula calculates the furnace outlet flue gas ingredient Vx LT
VCO2 LT=VCO2°+VCO2 12+VCO2 22
VSO2 LT=VSO2°+VSO2 12+VSO2 22
VH2O LT=VH2O°+VH2O 12+VH2O 22
VO2 LT=VO2°×(αOX-1);
VN2 LT=VN2°+VN2 12+VN2 22
VAr LT=VAr 12+VAr 22
In formula, VCO2 LT、VCO2°、VCO2 12And VCO2 22Respectively indicate the carbon dioxide content of furnace outlet, theory needs dioxy Change carbon content, primary air fan outlet carbon dioxide content and secondary air fan and export carbon dioxide content, wherein theory needs dioxy Change carbon content VCO2° indicate not considering CO required for hearth combustion fuel in the case that air leaks out with air preheater air leakage2Contain Amount.
In formula, VSO2 LT、VSO2°、VSO2 12And VSO2 22Respectively indicate the content of sulfur dioxide of furnace outlet, theory needs dioxy Change sulfur content, primary air fan outlet content of sulfur dioxide and secondary air fan and exports content of sulfur dioxide;
In formula, VH2O LT、VH2O°、VH2O 12And VH2O 22Respectively indicate the vapour content of furnace outlet, theory needs water vapour Content, primary air fan outlet vapour content and secondary air fan export vapour content;
In formula, VO2 LT、VO2°、αOXRespectively indicate the oxygen content of furnace outlet, theory needs oxygen content and the boundary Oxygen quotient is crossed in parameter, wherein VO2° value acquisition and CO2The case where it is identical, cross oxygen quotient can be identified as 1.15;
In formula, VN2 LT、VN2°、VN2 12And VN2 22Respectively indicate nitrogen content of furnace outlet, theory needs nitrogen content, one Secondary fan outlet nitrogen content and secondary air fan export nitrogen content;
In formula, VAr LT、VAr 12And VAr 22Respectively indicate furnace outlet argon content, primary air fan outlet argon content and Secondary air fan exports argon content.
In addition, for Vx 12And Vx 22Subscript, it is assumed that the subscript is expressed as tt, then first t value was 1 and 2 time-divisions Not Biao Shi primary air fan and secondary air fan, second t value respectively indicate entrance and exit when being 1 and 2.
2, air preheater exiting flue gas ingredient calculates
Air preheater exiting flue gas ingredient is represented by Vx KYQ, wherein subscript KYQ indicates that air preheater, subscript x indicate CO2、SO2、 H2O、O2、N2And Ar.
In the present embodiment, air preheater mainly includes two kinds of tube-type air preheater and Junker formula air preheater, corresponding flue gas at Divide calculation method not identical.
A) tube-type air preheater
In tube-type air preheater, flue gas and combustion adjuvant (i.e. oxygen) are without exchanging, therefore furnace outlet and empty prediction device outlet two The smoke components at place are unchanged, i.e. Vx KYQ=Vx LT
B) Junker formula air preheater
Junker formula air preheater need to consider that a secondary wind direction fume side is leaked out, i.e. consideration air preheater air leakage rate, air preheater air leakage Rate is divided into the air preheater air leakage rate (i.e. First air combustion adjuvant to fume side air leak rate of air curtain) and Secondary Air that First air corresponds to the air preheater The air preheater air leakage rate (i.e. secondary air combustion aid agent to fume side air leak rate of air curtain) of the corresponding air preheater, the present embodiment is assumed to be L1 KYFor L2 KY
Accordingly, it for Junker formula air preheater, need to consider air preheater air leakage rate, therefore be calculated using the following equation the air preheater Exiting flue gas ingredient:
Vx KYQ=Vx LT+L1 KYVx 11+L2 KYVx 21
Wherein, Vx 11And Vx 21The content and secondary air fan of each gas respectively in the smoke components of primary air fan entrance enter The content of each gas in the smoke components of mouth.
3, air-introduced machine inlet flue gas ingredient calculates
Air-introduced machine inlet flue gas ingredient is represented by Vx YFJ, wherein subscript YFJ indicates that air-introduced machine, subscript x indicate CO2、SO2、 H2O、O2、N2And Ar.
In the present embodiment, it is calculated using the following equation the air-introduced machine inlet flue gas ingredient Vx YFJ
VCO2 YFJ=VCO2 KYQ
VSO2 YFJ=VSO2 KYQ
VH2O YFJ=VH2O KYQ+VH2O kq
VO2 YFJ=VO2 KYQ+VO2 kq
VN2 YFJ=VN2 KYQ+VN2 kq
VAr YFJ=VAr KYQ
VH2O kq+VO2 kq+VN2 kqLFVLT
In formula, VH2O kq、VO2 kqAnd VN2 kqRespectively indicate water vapour, oxygen and the nitrogen in the flue gas for leaking into air-introduced machine entrance Content, αLFIndicate air air leak rate of air curtain, VLTIndicate total flue gas volume of furnace outlet.
4, smoke components calculate after condensing
Smoke components are represented by V after condensationx LN, wherein subscript LN indicates condensation, and subscript x indicates CO2、SO2、H2O、O2、N2 And Ar.
In the present embodiment, smoke components are identical as the air-introduced machine inlet flue gas ingredient after the condensation, can derive accordingly Smoke components V after the condensation can be calculated using following formula outx LN
VCO2 LN=VCO2 YFJ=VCO2 KYQ
VSO2 LN=VSO2 YFJ=VSO2 KYQ
VH2O LN=VH2O YFJ=VH2O KYQ+VH2O kq
VO2 LN=VO2 YFJ=VO2 KYQ+VO2 kq
VN2 LN=VN2 YFJ=VN2 KYQ+VN2 kq
VAR LN=VAR YFJ=VAR KYQ
VH2O kq+VO2 kq+VN2 kqLFVLT
Meaning represented by relevant parameter is seen above in formula, is no longer repeated herein.
5, the smoke components cloud computing of circulating flue gas, flue gas of discharging fume smoke components calculate, the cigarette of a secondary air fan entrance Gas ingredient calculates and the smoke components of one Secondary Air of air preheater outlet calculate.
The smoke components that this part is related to calculate publicity, calculation formula by establishing loop iteration inside Microsoft Excel After the completion of foundation, selection enables iterative calculation under EXCEL option formula, and the number of iterations selects 1000 times, iteration precision selection 0.00001, it is clicked after choosing and starts to calculate or select automatic calculating, then by changing input variable, so that oxygen Pressure reaches the parameter value (26% --- 29%) needed for us, records each point gas componant, smoke components calculating finishes.
Further, after the smoke components for obtaining oxygen-enriched boiler each point, the smoke components calculation method of the present embodiment is also Including:According to the smoke components of the calculated oxygen-enriched boiler each point, the smoke components for calculating the oxygen-enriched boiler each point are accounted for The volume share of total flue gas volume of the oxygen-enriched boiler.
In the present embodiment, it is assumed that γxIndicate the volume share of gas, VyIndicate flue gas total measurement (volume), by taking furnace outlet as an example, Then the volume share calculation formula of each gas of furnace outlet is as follows:
Vy=∑ Vx LT=VLT
γx=Vx LT/Vy
In formula, subscript x indicates CO2、SO2、H2O、O2、N2And Ar.
Further, after the volume share for obtaining each gas, smoke density ρ can also be further calculated outyAnd flue gas mass Gy, calculation formula is as follows:
ρy=(MO2×γO2+MCO2×γSO2+MCO2×γCO2+MH2O×γH2O+MN2×
γN2+MAr×γAr)/22.4
Gyy×Vy
Wherein, MxIndicate the molal weight of gas.
Further, above-mentioned all calculation formula created can be designed as corresponding function mould in a manner of program Block, then in the case where meeting boundary parameter requirement, call each functional module calculate the flue gas under oxygen-enriched boiler actual condition at Divide and calculates.
Illustrate the smoke components calculation method of oxygen-enriched boiler involved in above-described embodiment below by an example Concrete application.
In the example, the fuel of oxygen-enriched boiler uses coal dust, and the coal quality parameter of coal dust is as shown in table 1.
1 coal quality parameter of table
In addition to coal quality parameter, the input variable calculated for smoke components should be also further chosen, in these input variables It include boundary parameter.Input variable in this example is as shown in table 2.
2 input variable of table
On the basis of the coal quality parameter of known table 1 and the input variable of table 2, the formula in conjunction with involved in above-described embodiment (or the corresponding functional module of formula), can be calculated smoke components and volume share difference is as shown in Table 3 and Table 4, wherein Based on obtained smoke components and volume share, cooperate parameters, the those skilled in the art such as smoke density that can also further count Calculate smoke density, flue gas mass etc..
3 smoke components calculated result of table
4 volume share calculated result of table
According to the calculated result of table 3 and table 4, it is known that using the calculated smoke components of the method for the present embodiment as a result, energy What the requirement and industry for meeting boundary parameter were formulated《Boiler thermodynamic calculation standard》.
In conclusion the embodiment of the present invention fully considers oxygen-enriched boiler field engineering in flue gas recirculation iterative calculation Present in various situations of leaking out, especially air preheater the influence leaked out to entirely iterating to calculate, simulate as far as possible oxygen-enriched The reality of boiler field engineering calculates to degree of precision the smoke components under oxygen-enriched boiler actual condition, to item of demonstrating from now on Mesh and the oxygen-enriched boiler design of comercial operation unit provide basic calculation method.
It is described the prefered embodiments of the present invention in detail above in conjunction with attached drawing, still, the present invention is not limited to above-mentioned realities The detail in mode is applied, within the scope of the technical concept of the present invention, a variety of letters can be carried out to technical solution of the present invention Monotropic type, these simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, the present invention to it is various can No further explanation will be given for the combination of energy.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally The thought of invention, it should also be regarded as the disclosure of the present invention.

Claims (8)

1. a kind of smoke components calculation method of oxygen-enriched boiler, which is characterized in that the smoke components calculation method includes:
Detect the operating condition of oxygen-enriched boiler;And
In the case where the operating condition meets boundary parameter requirement, the smoke components of oxygen-enriched boiler each point are calculated;
Wherein, the smoke components for calculating oxygen-enriched boiler each point include:Richness is calculated in conjunction with the air preheater air leakage rate of oxygen-enriched boiler The air preheater exiting flue gas ingredient of oxygen boiler;
Wherein, the air preheater air leakage rate of the oxygen-enriched boiler of the combination calculates the air preheater exiting flue gas ingredient of oxygen-enriched boiler and includes:
If the air preheater is tube-type air preheater, the furnace outlet flue gas of the air preheater exiting flue gas ingredient and oxygen-enriched boiler Ingredient is identical;
If the air preheater is Junker formula air preheater, it is calculated using the following equation the air preheater exiting flue gas ingredient:
Vx KYQ=Vx LT+L1 KYVx 11+L2 KYVx 21
In formula, Vx KYQIndicate the content of each gas in air preheater exiting flue gas ingredient, Vx LTIndicate each in furnace outlet flue gas ingredient The content of gas, L1 KYAnd L2 KYThe respectively air preheater air leakage rate of First air and Secondary Air relative to air preheater, Vx 11And Vx 21Point It Wei not each gas in the content of each gas and the smoke components of secondary air fan entrance in the smoke components of primary air fan entrance Content, it includes carbon dioxide, sulfur dioxide, water vapour, oxygen, nitrogen and argon gas that wherein subscript x, which indicates each gas,.
2. smoke components calculation method according to claim 1, which is characterized in that the boundary parameter includes that air leaks out Rate crosses oxygen quotient, circulating ratio, enters in burner hearth partial pressure of oxygen, First air oxygen wind pressure, First air oxygen concentration and First air note oxygen amount One of or more persons.
3. smoke components calculation method according to claim 1, which is characterized in that the cigarette for calculating oxygen-enriched boiler each point Gas ingredient further includes:
It is calculated using the following equation the furnace outlet flue gas ingredient of oxygen-enriched boiler:
VCO2 LT=VCO2°+VCO2 12+VCO2 22
VSO2 LT=VSO2°+VSO2 12+VSO2 22
VH2O LT=VH2O°+VH2O 12+VH2O 22
VO2 LT=VO2°×(αOX-1);
VN2 LT=VN2°+VN2 12+VN2 22
VAr LT=VAr 12+VAr 22
In formula, VCO2 LT、VCO2°、VCO2 12And VCO2 22Respectively indicate the carbon dioxide content of furnace outlet, theory needs carbon dioxide Content, primary air fan outlet carbon dioxide content and secondary air fan export carbon dioxide content;VSO2 LT、VSO2°、VSO2 12And VSO2 22 Respectively indicate the content of sulfur dioxide of furnace outlet, theory needs content of sulfur dioxide, primary air fan outlet content of sulfur dioxide Content of sulfur dioxide is exported with secondary air fan;VH2O LT、VH2O°、VH2O 12And VH2O 22Respectively indicate furnace outlet vapour content, Theory needs vapour content, primary air fan outlet vapour content and secondary air fan outlet vapour content;VO2 LT、VO2°、αOX Respectively indicate the oxygen content of furnace outlet, theory needs to cross oxygen quotient in oxygen content and the boundary parameter;VN2 LT、 VN2°、VN2 12And VN2 22Respectively indicate nitrogen content of furnace outlet, theory needs nitrogen content, primary air fan outlet nitrogen contains Amount and secondary air fan export nitrogen content;VAr LT、VAr 12And VAr 22Respectively indicate the argon content of furnace outlet, primary air fan goes out Mouth argon content and secondary air fan export argon content.
4. smoke components calculation method according to claim 1, which is characterized in that the cigarette for calculating oxygen-enriched boiler each point Gas ingredient further includes:
It is calculated using the following equation the air-introduced machine inlet flue gas ingredient of oxygen-enriched boiler:
VCO2 YFJ=VCO2 KYQ
VSO2 YFJ=VSO2 KYQ
VH2O YFJ=VH2O KYQ+VH2O kq
VO2 YFJ=VO2 KYQ+VO2 kq
VN2 YFJ=VN2 KYQ+VN2 kq
VAr YFJ=VAr KYQ
VH2O kq+VO2 kq+VN2 kqLFVLT
In formula, VCO2 YFJ、VSO2 YFJ、VH2O YFJ、VO2 YFJ、VN2 YFJAnd VAr YFJRespectively indicate the dioxy in air-introduced machine inlet flue gas ingredient Change the content of carbon, sulfur dioxide, water vapour, oxygen, nitrogen and argon gas, VCO2 KYQ、VSO2 KYQ、VH2O KYQ、VO2 KYQ、VN2 KYQAnd VAr KYQ The content of carbon dioxide in air preheater exiting flue gas ingredient, sulfur dioxide, water vapour, oxygen, nitrogen and argon gas is respectively indicated, VH2O kq、VO2 kqAnd VN2 kqRespectively indicate the content of water vapour in the flue gas for leaking into air-introduced machine entrance, oxygen and nitrogen, αLFIt indicates Air air leak rate of air curtain, VLTIndicate total flue gas volume of furnace outlet.
5. smoke components calculation method according to claim 4, which is characterized in that the cigarette for calculating oxygen-enriched boiler each point Gas ingredient further includes:
Calculate the smoke components after the condensation of oxygen-enriched boiler, and after the condensation smoke components and the air-introduced machine inlet flue gas at Split-phase is same.
6. smoke components calculation method according to claim 1, which is characterized in that the cigarette for calculating oxygen-enriched boiler each point Gas ingredient further includes:
Calculate the smoke components of the circulating flue gas of oxygen-enriched boiler, the smoke components of flue gas of discharging fume, the flue gas of a secondary air fan entrance Ingredient and air preheater export the smoke components of a Secondary Air.
7. smoke components calculation method according to any one of claim 1 to 6, which is characterized in that the smoke components meter Calculation method further includes:
According to the smoke components of the calculated oxygen-enriched boiler each point, the smoke components for calculating the oxygen-enriched boiler each point account for richness The volume share of total flue gas volume of oxygen boiler.
8. smoke components calculation method according to claim 7, which is characterized in that the smoke components calculation method is also wrapped It includes:
The volume share that total flue gas volume of the oxygen-enriched boiler is accounted for according to the smoke components of the oxygen-enriched boiler each point, calculates Smoke density and flue gas mass.
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