CN104376145A - Method for evaluating burning quality of turbulent burner based on CFD technology - Google Patents
Method for evaluating burning quality of turbulent burner based on CFD technology Download PDFInfo
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- CN104376145A CN104376145A CN201410395777.2A CN201410395777A CN104376145A CN 104376145 A CN104376145 A CN 104376145A CN 201410395777 A CN201410395777 A CN 201410395777A CN 104376145 A CN104376145 A CN 104376145A
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Abstract
The invention discloses a method for evaluating the burning quality of a turbulent burner based on a CFD technology. The method includes the steps that an air flow field model and a flame tube-hearth model of a burner of different primary and secondary air distribution structure are established, the air flow field distribution and the burner burning flow field distribution in the burner of different primary and secondary air distribution structures are calculated in a simulating mode, hence, a temperature value distribution curve on the central axis of a hearth can be extracted, the flame length, the average temperature and the mass concentration of Nox, CO and CO2 are calculated, and the burning quality evaluation of the secondary air door opening degree is conducted from the three aspects of burning efficiency, heating effects and pollutant discharge. A reference basis is provided for operation and design optimization of the turbulent burner, and the blank of the burning effect evaluating method of the turbulent burner in the CFD technology is filled.
Description
Technical field
The present invention relates to a kind of turbulent burner burning quality evaluation method based on CFD technology, particularly relate to a kind of turbulent burner Combustion Flow Field utilizing CFD software simulation under not same Secondary Air air distribution structure to distribute and product situation, not same Secondary Air air distribution structure burning quality is accurately passed judgment on.
Background technology
Burner (Burner) is after fuel and air spray in a certain way and the device of mixed combustion is wherein referred to as, in thermal treatment and the industry relevant with heat energy, burner is essential, as common boiler, smelting furnace, smelting furnace etc., as the core of whole heating arrangement, which control the power of controlled device, Temperature Distribution, the thermal efficiency and serviceable life.
In the combustion process of vortex burner, one Secondary Air proportioning supply situation can affect the combustion rate of combustible, flame size, heating effect and pollutant emission, a Secondary Air proportioning is controlled by a Secondary Air air distribution structure of control combustion device, finally can determine burning quality, ensure combustion efficiency.And in practical application, how to determine a rational Secondary Air air distribution structure, being the key that burner controls, is also one of difficulties.
In engineering science, two kinds of means are mainly divided into the research of combustion process: experimental research and numerical simulation.The former adopts the method directly or indirectly measuring combustion parameter, make the research of some combustion processes can be simple and clear, but its cost is high, the cycle long, difficult parameters to change flexibly, turbulent characteristic parameter, combustion parameter are difficult to direct measurement, measurement result should not be extrapolated, and limits its practical application.And on the other hand, Computer Numerical Simulation, under the promotion of computer technology, theoretical algorithm etc., has developed the supplemental tool into experimental study rapidly, becomes the important tool of combustion flows area research.
The judgment criteria of evaluation burner combustion quality ununified at present.Use the not same Secondary Air air distribution structure turbulent burner combustion case of CFD technical modelling emulation, effectively can shorten the research cycle of turbulent burner, cyclone is utilized to ignore the Flow Field Distribution of burner internal to the appreciable impact that air flows, simplified model, to reduce calculated amount, meanwhile, invent the turbulent burner combustion efficiency evaluation method based on CFD technology, will the design and running optimization of turbulent burner be contributed to.
Summary of the invention
For solving the problem, the invention provides a kind of turbulent burner burning quality evaluation method based on CFD technology, using as the reference frame designed based on CFD software turbulent burner, assisting turbulent burner structural design and running optimizatin.
This evaluation method is based on CFD flow field simulation technology, not same Secondary Air air distribution structure burner air basin and burner inner liner-hearth model three-dimensional modeling is carried out according to designed turbulent burner, burner air water shed model is utilized to emulate the Secondary Air proportioning obtaining not same Secondary Air air distribution structure, under the situation that burner inner liner-hearth model is identical, utilize burner inner liner-hearth model analysis not same Secondary Air air distribution structure turbulent burner Combustion Flow Field distribution, obtain temperature value distribution curve on burner hearth axis by simulation result, calculate the length of flame; The velocity flow profile extent that the velocity flow profile of theoretical analysis cross-section and emulation obtain, obtains medial temperature and No by calculating
x, CO, CO
2mass concentration; By the length of flame, medial temperature and each flue gas composition mass concentration, judge the burning quality of a Secondary Air air distribution structure from burning efficiency, heating effect and pollutant emission three aspects.Wherein, the length of flame is longer, and more even to burner hearth heating, medial temperature is higher, and heating effect is better; CO mass concentration is lower, CO
2mass concentration is higher, and burning efficiency is higher; No
xmass concentration is lower, discharges pollutants fewer, passes judgment on burning quality better.
Turbulent burner burning quality evaluation method based on CFD technology of the present invention is achieved through the following technical solutions:
Its method specifically comprises:
The burner air water shed model of a, the not same Secondary Air air distribution structure of foundation.
Described burner air water shed model is set up multiple according to different Secondary Air air distribution structures, the corresponding burner air water shed model of each opening value.
B, calculate required fuel flow rate, shutter air velocity and corresponding Reynolds number according to burner rated power and fuel type.
C, not same Secondary Air air distribution structure burner air water shed model is carried out stress and strain model, CFD is imported to ready-portioned grid, arrange air material properties, boundary types and boundary condition, simulation calculation obtains air flow field distribution in not same Secondary Air air distribution structure burner.
Wherein, in boundary types and boundary condition are arranged, setting model includes: turbulent flow model and Laminar Flow model.
D, by carrying out integration to primary air piping outlet, obtain the corresponding Secondary Air proportioning of not same Secondary Air air distribution structure.
E, set up burner inner liner-hearth model, in burner inner liner-hearth model, comprise burner cyclone.
Burner inner liner-hearth model adopts same model in the emulation of not same Secondary Air air distribution structure.Burner cyclone can eliminate the impact of burner internal Flow Field Distribution, and simplified model designs, and reduces calculated amount.
F, to calculate burner inner liner-hearth model each air, the fluid velocity of fuel inlet and Reynolds number according to burner rated power, fuel type and the Secondary Air proportioning that obtains.
G, burner inner liner-hearth model is carried out stress and strain model, CFD is imported to ready-portioned grid, fluent material attribute, boundary types and boundary condition are set, simulation calculation burner combustion Flow Field Distribution.
Wherein, in the arranging of boundary types and boundary condition, setting model includes: based on fuel kind and burner combustion way selection combustion model, as: adopt non-premix combustion model or premixed combustion model, use the modes such as annular fuel gas outlet and/or center gas outlet.
Temperature distribution history and temperature value on h, acquisition burner hearth axis, calculate the length of flame.
Wherein, reach the highest when flame outline region is in steady fixed time temperature, now to determine on burner hearth axis flame contours coordinate on temperature distribution history and burner hearth axis, and calculate the length of flame according to burner inner liner exit coordinates and the peripheral coordinate of flame.
I, utilize CFD technology to carry out volume integral respectively to each smoke components of burner hearth, calculate medial temperature and No
x, CO, CO
2mass concentration.
J, by the length of flame, medial temperature and each flue gas composition mass concentration, judge the burning quality of not same Secondary Air air distribution structures from burning efficiency, heating effect and pollutant emission three aspects.
K, repetition above-mentioned steps e to j, until not same Secondary Air ratio combustion flow field simulation calculates and burning judge completes.
Described not same Secondary Air air distribution structure burner air basin and burner inner liner-hearth model adopt 3 d modeling software to set up.
The beneficial effect of technical scheme provided by the invention is:
By setting up not same Secondary Air air distribution structure burner air basin and burner inner liner-hearth model, air flow field distribution and correspondingly burner combustion Flow Field Distribution in simulation calculation not same Secondary Air air distribution structure burner, thus calculate the length of flame, medial temperature and No
x, CO, CO
2mass concentration, burning quality judge is carried out from burning efficiency, heating effect and pollutant emission three aspects, achieve the turbulent burner combustion simulation calculating fast and effectively of any Secondary Air air distribution structure, decrease calculated amount, for turbulent burner operation and optimal design provide reference frame, for not same Secondary Air air distribution structure burning quality quality provides judging basis, compensate for the blank of turbulent burner combustion efficiency evaluation method in CFD technology.
Accompanying drawing explanation
Fig. 1 is the turbulent burner combustion efficiency evaluation method process flow diagram based on CFD technology;
Fig. 2 is three different secondary throttle opening burner hearth central axis temperature distributing curve diagrams.
Embodiment
Below in conjunction with accompanying drawing 1, Fig. 2; under three different secondary throttle openings, the turbulent burner fuel gas buring CFD of power 10MW emulates with burning quality Appraisal process as embodiment; the present invention is described in further detail; its implementation process is one of them citing, can't produce any restriction to scope.
Concrete implementation step comprises:
Step 1, set up burner air water shed model.
The burner air water shed model of three different secondary throttle openings is set, and is designated as 15 °, 30 °, 45 ° respectively.
Step 2, calculate required fuel flow rate, shutter air velocity and corresponding Reynolds number according to burner rated power and fuel type
During known burner nominal operation, required air quantity V in the effective unit time
0=2.8866m
3/ s, air capacity inlet-duct area S=0.295776m
2, then have
if air intake opening is rectangle, its length of side is a=711mm, b=416mm, then its Equivalent Hydraulic Diameter is
Reynolds number is
Turbulence intensity I=0.16 (Re)
-1/8≈ 0.03.Wherein, outlet is set to atmospheric pressure conditions.
Step 3, stress and strain model is carried out to the burner air water shed model of three different secondary throttle openings.
In this example, tetrahedral grid system unit quantity is about 7,895,667.
Step 4, import CFD solve ready-portioned grid, arrange air material properties, boundary types and boundary condition, simulation calculation obtains air flow field distribution in three different secondary air door burners.
Wherein, boundary types and boundary condition are set to turbulent flow model.
Step 5, by primary air piping outlet is carried out integration obtain primary air flow, try to achieve three corresponding Secondary Air proportionings of different secondary throttle opening.As following table 1:
Table 1
Step 6, judging whether completing all Secondary Air structures, as completed, continuing following step.
Step 7, set up burner inner liner-hearth model.
Comprise burner cyclone in burner inner liner-hearth model, the impact of burner internal Flow Field Distribution can be eliminated.In this example, burner inner liner-hearth model is one, and burner inner liner-hearth model that the burner air water shed model of three different opening is identical with is corresponding.
Step 8, to calculate burner inner liner-hearth model each air, the fluid velocity of fuel inlet and Reynolds number according to burner rated power, fuel type and the Secondary Air proportioning that obtains.
Known fuel consumption V
r, first arrange boundary condition needs to calculate amount of actual air for combustion required when reaching burner predetermined power 10MW, and needed for combustion gas, theoretical air requirement computing formula is:
wherein,
for the calorific value of rock gas.The actual required air quantity computing formula of combustion gas: V=α V
0, in formula, α is excess air factor.Required air quantity formula: V in the effective unit time
k 0=V
rv, wherein, V
rfor Fuel Consumption.
Rate of flow of fluid calculates formula:
wherein, V
0for required fluid volume flow, A is fluid egress point sectional area.Fluid line hydraulic diameter formula:
in formula, A is the infiltration cross-sectional area of pipeline, and P is the infiltration girth of cross-section of pipeline.Turbulence intensity formula: I=0.16 × (Re)
-1/8, wherein, Reynolds number is
v is the kinematic viscosity of fluid.
Step 9, stress and strain model is carried out to burner inner liner-hearth model.
Step 10, fluent material attribute, boundary types and boundary condition are set, CFD are imported to ready-portioned grid and solves, simulation calculation burner combustion Flow Field Distribution.
In this example, select non-premix combustion model, burner inner liner-hearth model combustion system adopts nozzle ring pipe gas combustion system and center air gun fuel gas buring mode.
Concrete result of calculation is as table 2:
Table 2
Step 11, when flame outline regional temperature reaches stable, extract temperature distribution history and temperature value on burner hearth axis, determine flame contours coordinate on burner hearth axis, the length of flame is calculated according to burner inner liner exit coordinates and the peripheral coordinate of flame, and utilize CFD to carry out volume integral respectively to each smoke components of burner hearth, calculate medial temperature and No
x, CO, CO
2mass concentration.
Step 12, successively simulation calculation is carried out to the Secondary Air ratio combustion flow field of three apertures, obtain the relevant length of flame, medial temperature and each flue gas composition mass concentration parameter, and judge whether completing all Secondary Air proportionings.
As shown in Figure 2, flame inner air content is less, and burn insufficient, temperature is lower; More outward, burn more abundant, temperature is higher, and when determining the 2020K that temperature reaches higher, more stable, flame outline region is in steady state (SS), now, determines flame contours coordinate on burner hearth axis.
Concrete result of calculation is as shown in table 3:
Table 3
Step 13, by the length of flame, medial temperature and each flue gas composition mass concentration, pass judgment on the burning quality of secondary air register apertures from burning efficiency, heating effect and pollutant emission three aspects.
As can be seen from Table 3,15 °, 30 °, 45 ° three different secondary throttle openings have considerable influence to turbulent burner burning quality, wherein, when secondary air register aperture is 45 °, although in three apertures the highest, the CO of CO mass concentration
2mass concentration is minimum, and show that its burning efficiency is minimum, but its length of flame is the longest, medial temperature is the highest, average to burner hearth heating, heating effect is best, No
xmass concentration is minimum, and pollutant emission is minimum, therefore judges secondary air register aperture as the burning quality of 45 ° as best in three apertures.
So far, whole Appraisal process completes.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all do within the present invention's spirit and principle any amendment, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1., based on the turbulent burner burning quality evaluation method of CFD technology, it is characterized in that, described method comprises:
The burner air water shed model of a, the not same Secondary Air air distribution structure of foundation;
B, calculate required fuel flow rate, shutter air velocity and corresponding Reynolds number according to burner rated power and fuel type;
C, not same Secondary Air air distribution structure burner air water shed model is carried out stress and strain model, CFD is imported to ready-portioned grid, arrange air material properties, boundary types and boundary condition, simulation calculation obtains air flow field distribution in not same Secondary Air air distribution structure burner;
D, by carrying out integration to primary air piping outlet, obtain the corresponding Secondary Air proportioning of not same Secondary Air air distribution structure;
E, set up burner inner liner-hearth model, in burner inner liner-hearth model, comprise burner cyclone;
F, to calculate burner inner liner-hearth model each air, the fluid velocity of fuel inlet and Reynolds number according to burner rated power, fuel type and the Secondary Air proportioning that obtains;
G, burner inner liner-hearth model is carried out stress and strain model, CFD is imported to ready-portioned grid, fluent material attribute, boundary types and boundary condition are set, simulation calculation burner combustion Flow Field Distribution;
Temperature distribution history and temperature value on h, acquisition burner hearth axis, calculate the length of flame;
I, utilize CFD technology to carry out volume integral respectively to each smoke components of burner hearth, calculate medial temperature and No
x, CO, CO
2mass concentration;
J, by the length of flame, medial temperature and each flue gas composition mass concentration, judge the burning quality of not same Secondary Air air distribution structures from burning efficiency, heating effect and pollutant emission three aspects;
K, repetition above-mentioned steps e to j, until not same Secondary Air ratio combustion flow field simulation calculates and burning judge completes.
2. the turbulent burner burning quality evaluation method based on CFD technology according to claim 1, is characterized in that, described not same Secondary Air air distribution structure burner air basin and burner inner liner-hearth model adopt 3 d modeling software to set up; Described burner air water shed model is set up multiple according to different Secondary Air air distribution structures, the corresponding burner air water shed model of each opening value; Described burner inner liner-hearth model adopts same model in the emulation of not same Secondary Air air distribution structure.
3. the turbulent burner burning quality evaluation method based on CFD technology according to claim 1, it is characterized in that, in described step h, when flame outline region be in stable and temperature reaches the highest time, determine flame contours coordinate on burner hearth axis, calculate the length of flame according to burner inner liner exit coordinates and the peripheral coordinate of flame.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108108545A (en) * | 2017-12-15 | 2018-06-01 | 石化盈科信息技术有限责任公司 | Display methods and device are deduced in fire incident simulation based on GIS-Geographic Information System |
| CN108388755A (en) * | 2018-03-30 | 2018-08-10 | 哈尔滨理工大学 | A kind of simulating experimental for flame retardant cable combustion test |
| CN110285444A (en) * | 2019-06-28 | 2019-09-27 | 新奥数能科技有限公司 | The regulation method and device of gas fired-boiler |
| CN111520740A (en) * | 2020-03-16 | 2020-08-11 | 杭州电子科技大学 | Method for coordinately optimizing operation of multiple porous medium combustors |
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