CN103244953A - Burner output adjustment method and system after changing of fire coal types of pulverized coal boiler - Google Patents
Burner output adjustment method and system after changing of fire coal types of pulverized coal boiler Download PDFInfo
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Abstract
The invention discloses a burner output adjustment method after changing of fire coal types of a pulverized coal boiler. The method includes: setting up a meshing structure model of the boiler; setting up a mathematical model of each physical and chemical process formed by pulverized coal burning; simulating pulverized coal burning processes of the boiler changed in the coal types to acquire corresponding relation between output of various burners of the boiler and boiler burning performance indexes; and adjusting burner output of the boiler and enabling the boiler to satisfy preset burning performance indexes. Besides, the invention further provides a burner output adjustment system after changing of the fire coal types of the pulverized coal boiler. By the method and the system, accuracy and safety of burner output control after the boiler is changed in the coal types can be improved, the problems of unstable in-boiler burning and low burning efficiency easily resulting from manual control are solved, and pollutants produced during burning are decreased greatly.
Description
Technical field
The present invention relates to the pulverized-coal fired boiler technical field, relate in particular to a kind of pulverized-coal fired boiler and change exert oneself method of adjustment and a kind of pulverized-coal fired boiler of burner after the coal-fired kind and change burner after the coal-fired kind Adjustment System of exerting oneself.
Background technology
Along with power consumption is increasing, also more and more to the demand of coal, the contradiction of the production of electric coal and transportation and need for electricity is more and more outstanding, has become the bottleneck of restriction current Chinese economy development.In the time of the coal supply constant tension, coal price also rises steadily, and causes cost of electricity-generating constantly to increase.For reducing cost of electricity-generating, power plant begins to seek the low price coal one after another, and this just causes most power plant to be difficult to assurance and uses single design coal for a long time.In addition, coal resources distribute uneven, make and transport the coal in the North to the South that transferring coal from the west to the east becomes normality.Because of the factors such as wretched insufficiency of transport power, cause a lot of power plant to mix burning even to change burning boiler.
In this case, power plant has begun to use non-design coal, mixes at boiler and burns non-design coal.But because the restriction of objective condition, what mix that the foundation of burning adopts substantially is that the simple arithmetic of each composition adds and method in the coal, this method is basic feasible solution to the coal that the combustion characteristics of part ature of coal, grey melting characteristic approach, but when big to burning of coal characteristic or grey property difference, mix to burn and have the dangerous and uneconomic problem of boiler operatiopn.Meanwhile, burning, mix greenhouse gases and the noxious gas emission that the burning inferior coal kind brings for a long time also is a big problem that causes extensive concern.Consumption of coal is again to cause SO2(sulfur dioxide) main cause of discharging, SO2 80% or more discharging comes from coal fire discharged, a large amount of SO2 and discharges and produced large-area acid rain district.Energy-consuming also is to cause the main cause of greenhouse gas emission, and it is very urgent that the pressure of GHG emissions mitigation has become.Therefore, for the power plant that uses non-design coal for a long time, in order to strengthen large thermal power plant to the adaptability of coal, reduce cost of electricity-generating, improve economy and the security of power plant, numerous power plant have to begin that boiler is carried out the system reform and meet the demands.For example power plant, huge port, Tianjin is transformed the 300MW unit, changes burning bituminous coal and replaces original meager coal design coal; And for example the power plant, Yunfu is transformed burner region and the pulverized coal preparation system of steam generator system at coming the coal ature of coal to change a series of problems of bringing greatly.
But for widely used quadrangle tangential circle pulverized-coal fired boiler in the power plant, change burn non-design coal after (for example meager coal boiler change burn bituminous coal), aspect the influence of boiler combustion characteristic, also lack ripe engineering application in the different burners situation of exerting oneself, for example boiler changes and burns coal characteristic after other coal-fired kind and change influence to aspects such as boiler combustion exhausted, slagging scorification and dust stratifications, be to rely on artificial experience to control at present mostly, had a strong impact on security and the economy of boiler operatiopn.
Summary of the invention
Based on this, the invention provides a kind of pulverized-coal fired boiler and change exert oneself method of adjustment and a kind of pulverized-coal fired boiler of burner after the coal-fired kind and change burner after the coal-fired kind Adjustment System of exerting oneself.
A kind of pulverized-coal fired boiler changes burner after the coal-fired kind method of adjustment of exerting oneself, and may further comprise the steps:
According to the design parameter of quadrangle tangential circle pulverized-coal fired boiler, according to the structure in DC burner, furnace hopper zone, burner region, burner upper area and pendant superheater zone, set up the gridding structural model of described boiler;
According to described gridding structural model, set up the Mathematical Modeling of the formed gas phase turbulance flow process of coal dust firing, two flow process of gas-solid, radiant heat transfer process and nitrogen oxide generative process;
According to the described Mathematical Modeling of setting up, the process of coal combustion that described boiler changes after the coal-fired kind is simulated the various burners that the obtain described boiler corresponding relation between situation and the boiler combustion performance indications of exerting oneself;
According to the described corresponding relation that obtains, the burner of described boiler exerted oneself adjust, make described boiler satisfy default combustibility index.
Compare with general technology, pulverized-coal fired boiler of the present invention changes burner after the coal-fired kind method of adjustment of exerting oneself and sets up the Mathematical Modeling corresponding with formed each physical and chemical processes of coal dust firing, the various burners that adopt the method for numerical simulation the to obtain described boiler corresponding relation between situation and the boiler combustion performance indications of exerting oneself, and according to the described corresponding relation that obtains, the burner of described boiler exerted oneself adjust, make described boiler satisfy default combustibility index.The present invention is weak point consuming time in the numerical simulation process, and it is low to assess the cost, and do not need the regulation and control at power plant scene to cooperate in the implementation procedure, and analog result has good visuality.The present invention can improve pulverized-coal fired boiler and change accuracy rate and the security that coal-fired kind afterburner is exerted oneself and controlled, overcome and adopted the unstable and low problem of efficiency of combustion of stove internal combustion that Artificial Control caused easily, greatly reduced the pollutant that produces in the combustion process simultaneously.
A kind of pulverized-coal fired boiler changes burner after the coal-fired kind Adjustment System of exerting oneself, and comprises that structural model is set up module, Mathematical Modeling is set up module, analog module and adjusting module;
Described structural model is set up module, be used for the design parameter according to the quadrangle tangential circle pulverized-coal fired boiler, according to the structure in DC burner, furnace hopper zone, burner region, burner upper area and pendant superheater zone, set up the gridding structural model of described boiler;
Described Mathematical Modeling is set up module, is used for according to described gridding structural model, sets up the Mathematical Modeling of the formed gas phase turbulance flow process of coal dust firing, two flow process of gas-solid, radiant heat transfer process and nitrogen oxide generative process;
Described analog module is used for according to the described Mathematical Modeling of setting up, and the process of coal combustion that described boiler changes after the coal-fired kind is simulated, the various burners that the obtain described boiler corresponding relation between situation and the boiler combustion performance indications of exerting oneself;
Described adjusting module is used for according to the described corresponding relation that obtains, and the burner of described boiler is exerted oneself adjust, and makes described boiler satisfy default combustibility index.
Compare with general technology, pulverized-coal fired boiler of the present invention changes burner after the coal-fired kind Adjustment System of exerting oneself and sets up the Mathematical Modeling corresponding with formed each physical and chemical processes of coal dust firing, the various burners that adopt the method for numerical simulation the to obtain described boiler corresponding relation between situation and the boiler combustion performance indications of exerting oneself, and according to the described corresponding relation that obtains, the burner of described boiler exerted oneself adjust, make described boiler satisfy default combustibility index.The present invention is weak point consuming time in the numerical simulation process, and it is low to assess the cost, and do not need the regulation and control at power plant scene to cooperate in the implementation procedure, and analog result has good visuality.The present invention can improve pulverized-coal fired boiler and change accuracy rate and the security that coal-fired kind afterburner is exerted oneself and controlled, overcome and adopted the unstable and low problem of efficiency of combustion of stove internal combustion that Artificial Control caused easily, greatly reduced the pollutant that produces in the combustion process simultaneously.
Description of drawings
Fig. 1 changes the exert oneself schematic flow sheet of method of adjustment of burner after the coal-fired kind for pulverized-coal fired boiler of the present invention;
Fig. 2 is the gridding schematic diagram of chamber structure;
The corresponding relation schematic diagram of coal dust burn-off rate when Fig. 3 exerts oneself inequality for burner;
The corresponding relation schematic diagram of unburned carbon in flue dust when Fig. 4 exerts oneself inequality for burner;
The corresponding relation schematic diagram of NOx discharge capacity when Fig. 5 exerts oneself inequality for burner;
Fig. 6 is the burner uneven corresponding relation schematic diagram of furnace outlet temperature at present of exerting oneself;
When Fig. 7 exerts oneself inequality for burner along the mean temperature distribution schematic diagram of furnace height;
When Fig. 8 exerts oneself inequality for burner along the oxygen amount distribution schematic diagram of furnace height;
When Fig. 9 exerts oneself inequality for burner along the CO growing amount distribution schematic diagram of furnace height;
When Figure 10 exerts oneself inequality for burner along the NOx growing amount distribution schematic diagram of furnace height;
Figure 11 changes the exert oneself structural representation of Adjustment System of burner after the coal-fired kind for pulverized-coal fired boiler of the present invention.
The specific embodiment
For further setting forth the technological means that the present invention takes and the effect that obtains, below in conjunction with accompanying drawing and preferred embodiment, to technical scheme of the present invention, know and complete description.
See also Fig. 1, for pulverized-coal fired boiler of the present invention changes the exert oneself schematic flow sheet of method of adjustment of burner after the coal-fired kind.Pulverized-coal fired boiler of the present invention changes burner after the coal-fired kind method of adjustment of exerting oneself, and may further comprise the steps:
S101 according to the structure in DC burner, furnace hopper zone, burner region, burner upper area and pendant superheater zone, sets up the gridding structural model of described boiler according to the design parameter of quadrangle tangential circle pulverized-coal fired boiler;
According to the flow behavior of burner outlet, as boiler-burner entrance boundary condition, make up and find the solution the zone and carry out the grid division, increase the level of 4m and the contraction section of 4m at furnace outlet, to obtain fully developed flow in the exit.In order to obtain high-quality computing grid, adopt subregion grid division methods, adopt the structuring hexahedral mesh, for accurate simulated combustion device outlet air aerodynamic field, the grid local cypher need be carried out in the burner inlet zone, and total grid number is 2,000,000.As shown in Figure 2, be the gridding schematic diagram of chamber structure.
As one of them embodiment, in the step of the described gridding structural model of setting up described boiler, described design parameter comprises evaporation capacity, main steam pressure, main steam temperature, reheated steam flow, reheated steam inlet pressure, reheated steam outlet pressure, reheated steam inlet temperature, reheated steam outlet temperature, feed temperature, exhaust gas temperature, hot blast temperature, boiler efficiency, calculated fuel consumption, actual fuel consumption and burner design parameter.
When setting up the gridding model, necessary design parameter need all comprise, can guarantee to set up effective model like this.In addition, design parameter is more many, and then the model of Jian Liing is more accurate.Table 1 is the embodiment of a boiler main design parameters.
Table 1 boiler main design parameters
As one of them embodiment, described burner design parameter comprises that wind, secondary wind, tertiary air, wind surrounding air, tertiary air surrounding air and a burner hearth leak out.
When setting up the gridding model, the burner design parameter is The more the better, can guarantee like this to set up effectively and model accurately.Table 2 is the embodiment of a burner design parameter.
Table 2 burner design parameter
| Project | Wind rate % | Wind speed m/s | Wind-warm syndrome ℃ |
| A wind | 15 | 22.7 | 243 |
| Secondary wind | 56.1 | 46.5 | 350 |
| Tertiary air | 19 | 56.1 | 120 |
| A wind surrounding air | 4 | 40 | 350 |
| The tertiary air surrounding air | 1.9 | 10.8 | 350 |
| Burner hearth leaks out | 4 | -- | Cold wind |
FLUENT provides separate type and manifold type two class solvers, and manifold type is divided into implicit expression and explicit two kinds.
Separate type solver (segregated solver) is to find the solution each equation (about the equation of u, v, w, p and T) sequentially, seriatim.Just elder generation separates another one equation (as the v equation of momentum) again after total-grid solves an equation (as the u equation of momentum).Because governing equation is non-linear, and is coupled each other, therefore, before obtaining convergence solution, be through too much wheel iteration.Each is taken turns iteration and is made up of following steps:
According to the result of current solution, upgrade all flow variables.Just begin if calculate, then upgrade with initial value;
Find the solution u, v and the w equation of momentum in order respectively, obtain velocity field.When calculating, the mass flow of pressure and unit interface is used current given value;
The speed that obtains because of previous step does not satisfy continuity equation probably, therefore, with the pressure correction equation of continuity equation and a Poisson type of linearizing equation of momentum structure, finds the solution this pressure correction equation then, obtains the correction value of pressure field and velocity field;
Utilize the velocity field and the pressure field that newly obtain, the governing equation of finding the solution other scalars (as temperature, tubulence energy and component etc.);
For the simulation that comprises discrete phase, when there is alternate coupling in inside, upgrade the source item of continuous phase according to the track result of calculation of discrete phase;
Check whether equation group restrains.If do not restrain, get back to the first step, repeat.
Manifold type solver (coupled solver) is the coupled wave equation of finding the solution continuity equation, the equation of momentum, energy equation and component transport equation simultaneously, then, finds the solution turbulent flow equiscalar equation more seriatim.Because governing equation is non-linear, and is coupled each other, therefore, before obtaining convergence solution, be through 2 iteration.Each is taken turns iteration and is made up of following steps:
According to the result of current solution, upgrade all flow variables.Just begin if calculate, then upgrade with initial value;
Find the solution the coupled wave equation group (latter two equation is optionally found the solution) of continuity equation, the equation of momentum, energy equation and component transport equation simultaneously;
As required, find the solution turbulent flow, radiation equiscalar equation seriatim.Attention is before finding the solution, and the relevant variable of using in the equation will upgrade with the result who obtains previously;
For the simulation that comprises discrete phase, when there is alternate coupling in inside, upgrade the source item of continuous phase according to the track result of calculation of discrete phase;
Check whether equation group restrains.If do not restrain, get back to the first step, repeat.
Two kinds of solvers all are applicable to from being pressed onto can press at a high speed very large-scale and flow, but generally, but when calculating that baric flow is moving at a high speed, the manifold type solver has more advantage.The manifold type solver is rapid convergence very usually, but needed internal memory approximately is 1.5 to 2 times of the separate type solver.
In addition, the several physical models that provide in the separate type solver do not have in the manifold type solver.These physical models comprise: the periodic flow movable model of fluid volume model (VOF), heterogeneous mixed model, Euler's mixed model, PDF combustion model, pre-mixing combustion model, given mass flow, periodicity heat conduction model and shell conduction model etc.
Because the present invention will use PDF combustion model simulation boiler combustion, and the computer hardware configuration is limited, so select the separate type solver.
Three kinds of algorithms are provided among the FLUENT: SIMPLE algorithm, SIMPLEC algorithm and PISO algorithm.SIMPLEC and PISO algorithm have convergence rate faster, with respect to computing time of SIMPLE algorithm reducing 30%～50%.For transient problem, the PISO algorithm has remarkable advantages, and for steady state problem, can select the SIMPLE serial algorithm.The present invention can select the SIMPLE algorithm for use.
The SIMPLE algorithm can be described below: for given pressure field (it can be the value of supposition, or the resulting result of last iterative computation), find the solution the equation of momentum of discrete form, draw velocity field, therefore, must be revised given pressure field.The principle of revising is: the speed field energy corresponding with revised pressure field satisfies the continuity equation on this iteration level.Principle accordingly, we are by the pressure of the discrete form defined of the equation of momentum and the discrete form that concerns the substitution continuity equation of speed, thereby obtain the pressure correction equation, draw the pressure correction value by the pressure correction equation.Then, according to revised pressure field, try to achieve new velocity field.Check then whether velocity field restrains.If do not restrain, as given pressure field, begin the calculating of next level with revised force value.So repeatedly, up to the solution that obtains convergence.
S102 sets up the Mathematical Modeling of the formed gas phase turbulance flow process of coal dust firing, two flow process of gas-solid, radiant heat transfer process and nitrogen oxide generative process according to described gridding structural model;
The turbulent stress equation model:
The governing equation of turbulent flow is:
Continuity equation:
The equation of momentum (Navier-Stokes equation):
The transport equation of its dependent variable:
As seen, many six stress (3 direct stress and 3 shearing stress) in the equation group, that is:
At the processing mode of these six stress, obtained the method for various turbulent flow numerical simulations:
The present invention selects for use Realizable k-ε model to simulate.Standard k-ε model to the time equal strain rate king-sized situation, might cause the direct stress of bearing.And Realizable k-ε model mainly changes and is:
Variation has taken place in the turbulent viscosity computing formula, has introduced the content relevant with rotation and curvature:
Great changes have taken place in the ε equation, and the generation item in the equation no longer includes the generation item Gk in the k equation, and like this, present form has been represented the power conversion of spectrum better.
Second from the bottom in the ε equation does not have any singularity, even the k value is very little or be zero, denominator can not be zero yet.This and standard k-ε model and RNG k-ε model have very big difference.
Realizable k-ε model must be applied to various dissimilar flow simulatings by effective, comprises rotation homogeneous shear stream, includes the flowing freely of jet and mixed flow, flows in the pipeline, boundary layer flow, and have flowing of separation etc.
The radiation model:
Can calculate the radiation heat transfer problem with 5 kinds of models among the FLUENT, this in 5 model be respectively discrete heat exchange radiation model (DTRM), P-1 radiation model, Rosseland radiation model, surface emissivity model (S2S) and discrete coordinates (DO) radiation model.
Problem at the present invention's research is the burning of boiler, so select P-1 radiation model for use.
P-1 radiation model, radiation heat transfer equation are diffusion equations that calculating is less relatively, have comprised scattering effect in the model simultaneously, and in the very big computational problem of optical thicknesses such as burning, the calculating effect of P-1 model is all relatively good.
Component transport and Chemical Reaction Model:
Four kinds of analogy methods are provided among the FLUENT: general finite rate model; The non-premixed combustion model; The pre-mixing combustion model; Partly-premixed combination burning model.
The roughly policy of Model Selection is as follows:
General finite speed model is mainly used in: the problem that chemical constituent is mixed, transported and react; The problem (as chemical vapour deposition) of wall or particle surface reaction;
The non-premixed combustion model is mainly used in: comprise the reaction system of turbulent diffusion flame, this system is near chemical balance, and oxide wherein and fuel flow into the zone that will calculate respectively with two or three runners;
The pre-mixing combustion model is mainly used in: single, the fully premixed reagent flow of closing;
Partly-premixed combination burning model is mainly used in: the situation that has the premixed flame that changes equivalent ratio in the zone;
The present invention selects the non-premixed combustion model, with mixing mark-probability density function simulation gas phase turbulance burning.
The NOx generation model:
The NOx(nitrogen oxide) generates type and have three kinds: heating power type, quick type, fuel type.Formation mechanism is in the chapter 1 introduction.Be the numerical simulation of coal dust firing based on research object of the present invention, thus do not consider quick type NOx (it is mainly generated by the CH fuel combustion), but considered the combustion effect again of NOx.In addition, do not consider the generation of N2O in the model.
S103 is according to the described Mathematical Modeling of setting up, and the process of coal combustion that described boiler changes after the coal-fired kind is simulated, the various burners that the obtain described boiler corresponding relation between situation and the boiler combustion performance indications of exerting oneself;
As one of them embodiment, the coal-fired kind after described boiler changes is bituminous coal.
At present, bituminous coal is a kind of non-design coal that is widely adopted, and boiler changes the consumption rate of burning bituminous coal reduction coal dust.
As one of them embodiment, described boiler combustion performance indications comprise coal dust burn-off rate, unburned carbon in flue dust, nitrogen oxide emission and lower hearth outlet temperature.
In simulation process, the combustibility index of analysis is more many, and is more high in the accuracy rate that boiler operatiopn is controlled, and security is also more good, and follow-up engineering practice is more had directive significance.
Before simulation, need carry out a comparative analysis to boiler design coal and Actual combustion coal.Table 3 is the embodiment of design coal conventional analysis data.
Table 3 design coal conventional analysis data
Table 4 is an embodiment that the actual characteristic of coming coal and design coal is analyzed.
The characteristic that table 4 is actual to come coal and design coal relatively
| Coal | Q net,ar/(MJ·kg -1) | C ar/％ | V daf/％ |
| Design coal | 23.289 | 61.75 | 10.0 |
| Actual coal-fired | 18.8-24.0 | 52.0-66.5 | 4.5-30.0 |
See also Fig. 3, the corresponding relation schematic diagram of coal dust burn-off rate when exerting oneself inequality for burner.
See also Fig. 4, the corresponding relation schematic diagram of unburned carbon in flue dust when exerting oneself inequality for burner.
Base regime, down two-layer burner exert oneself increase to 2.5t/h and on two-layer burner exert oneself be reduced to 1.76t/h and down two-layer burner exert oneself be reduced to 1.76t/h and on two-layer burner exert oneself when increasing to 2.5t/h, the coal dust burn-off rate is respectively 99.85%, 99.65% and 99.88%, and unburned carbon in flue dust is respectively 0.311%, 0.527% and 0.280%.Contrast and base regime, two-layer burner is exerted oneself and is increased to 2.5t/h and go up two-layer burner and exert oneself and be reduced to 1.76t/h instantly, and the coal dust burn-off rate reduces, and has reduced by 0.2%; Unburned carbon in flue dust exerts oneself to change with burner has increased by 0.2% and 0.216%, increases more.This is inequality because burner is exerted oneself, and following two-layer burner increase is exerted oneself and can be caused the deficiency of lower floor's secondary air flow, and flame partly dashes down, produces the partial combustion inequality, and is influential slightly to efficiency of combustion, but influence is very little.Instantly two-layer burner is exerted oneself and is reduced to 1.76t/h and goes up two-layer burner and exert oneself when increasing to 2.5t/h, and burn-off rate and unburned carbon in flue dust contrast substantially become with base regime.Illustrate upper strata burner increase to exert oneself and the lower floor burner reduces under the situation about reducing of exerting oneself, boiler integral combustion efficient is constant substantially.
See also Fig. 5, the corresponding relation schematic diagram of NOx discharge capacity when exerting oneself inequality for burner.
Base regime, down two-layer burner exert oneself increase to 2.5t/h and on two-layer burner exert oneself be reduced to 1.76t/h and down two-layer burner exert oneself be reduced to 1.76t/h and on two-layer burner exert oneself when increasing to 2.5t/h, the NOx discharge capacity is respectively 211.15,210.66 and 224.42mg/m3 (6%O2).This shows that burner is exerted oneself uneven very little to the influence of NOx discharge capacity.
See also Fig. 6, be the burner uneven corresponding relation schematic diagram of furnace outlet temperature at present of exerting oneself.
Base regime, down two-layer burner exert oneself increase to 2.5t/h and on two-layer burner exert oneself be reduced to 1.76t/h and down two-layer burner exert oneself be reduced to 1.76t/h and on two-layer burner exert oneself when increasing to 2.5t/h, the lower hearth exit gas temperature is respectively 1344,1346 and 1342K, does not almost change.This shows that burner is exerted oneself uneven to lower hearth exit gas temperature also almost not influence.
The coal dust burn-off rate changes to some extent with the burner variation meeting of exerting oneself, and the upper strata burner increases load, and burn-off rate increased when lower floor reduced load, and unburned carbon in flue dust reduces; Otherwise the upper strata burner increases and reduces, and burn-off rate reduced when lower floor's burner load increased, and unburned carbon in flue dust increases, but two kinds of situations change all very little; The NOx discharge capacity is exerted oneself with burner and is changed basic not variation; The lower hearth exit gas temperature is exerted oneself with burner and is changed basic not variation; Exert oneself with burner and change basic not variation in wall thermic load maximum and maximum heating load zone; When exerting oneself the operation of uneven operating mode according to these two kinds of burners, wall thermic load deviation is less, but can there be certain cigarette temperature deviation in the lower hearth outlet.
As one of them embodiment, after the step of the described Mathematical Modeling of setting up the formed gas phase turbulance flow process of coal dust firing, two flow process of gas-solid, radiant heat transfer process and nitrogen oxide generative process, may further comprise the steps:
According to the described Mathematical Modeling of setting up, the process of coal combustion that described boiler changes after the coal-fired kind is simulated, obtained at exert oneself corresponding relation between situation lower hearth mean temperature, oxygen amount, carbon monoxide growing amount and formation of nitrogen oxides and the furnace height of various burners.
The corresponding relation that obtains between burner hearth mean temperature, oxygen amount, carbon monoxide growing amount and formation of nitrogen oxides and the furnace height is conducive to control more reliably in boiler running process.
See also Fig. 7, when exerting oneself inequality for burner along the mean temperature distribution schematic diagram of furnace height.
See also Fig. 8, when exerting oneself inequality for burner along the oxygen amount distribution schematic diagram of furnace height.
Be consistent along the mean temperature distribution trend of furnace height with distribution trend under becoming the oxygen amount, the distribution when different burners are exerted oneself also is consistent substantially.This shows, burner is exerted oneself and uneven the average flue-gas temperature of burner hearth not have to influence substantially.
See also Fig. 9, when exerting oneself inequality for burner along the CO growing amount distribution schematic diagram of furnace height.
Be consistent along the average CO mass fraction distribution trend of furnace height with distribution trend under becoming the oxygen amount, but the average CO mass fraction of different burner when exerting oneself distribute then variant slightly.Inequality causes the variation of burner partial oxygen amount up and down because the levels burner is exerted oneself, the uneven inequality that influences the CO Mass Distribution of coal dust firing, and more than after-flame wind, CO Mass Distribution basically identical.
See also Figure 10, when exerting oneself inequality for burner along the NOx growing amount distribution schematic diagram of furnace height.
Be consistent along the average N Ox growing amount distribution trend of furnace height with distribution trend under becoming the oxygen amount, but the average N Ox growing amount of different burner when exerting oneself distribute then variant slightly.Have last figure as can be seen the NOx distribution content under base regime compare two kinds of burners and exert oneself all for a short time under the uneven situation, further specify base regime and be operating mode.
S104 is according to the described corresponding relation that obtains, the burner of described boiler exerted oneself adjust, and makes described boiler satisfy default combustibility index.
Can adopt the whole bag of tricks that the burner of boiler is exerted oneself and control, for example can adopt computer control, also can manually control.
As one of them embodiment, after described burner to described boiler is exerted oneself the step of adjusting, may further comprise the steps:
In the running of described boiler, when the boiler combustion performance indications surpass default alarm index, then send alarm signal.
When the boiler combustion performance indications surpass default alarm index, report to the police, can guarantee the security of boiler control to a greater degree.
Compare with general technology, pulverized-coal fired boiler of the present invention changes burner after the coal-fired kind method of adjustment of exerting oneself and sets up the Mathematical Modeling corresponding with formed each physical and chemical processes of coal dust firing, the various burners that adopt the method for numerical simulation the to obtain described boiler corresponding relation between situation and the boiler combustion performance indications of exerting oneself, and according to the described corresponding relation that obtains, the burner of described boiler exerted oneself adjust, make described boiler satisfy default combustibility index.The present invention is weak point consuming time in the numerical simulation process, and it is low to assess the cost, and do not need the regulation and control at power plant scene to cooperate in the implementation procedure, and analog result has good visuality.The present invention can improve pulverized-coal fired boiler and change accuracy rate and the security that coal-fired kind afterburner is exerted oneself and controlled, overcome and adopted the unstable and low problem of efficiency of combustion of stove internal combustion that Artificial Control caused easily, greatly reduced the pollutant that produces in the combustion process simultaneously.
See also Figure 11, for pulverized-coal fired boiler of the present invention changes the exert oneself structural representation of Adjustment System of burner after the coal-fired kind.
Pulverized-coal fired boiler of the present invention changes burner after the coal-fired kind Adjustment System of exerting oneself, and comprises that structural model is set up module 201, Mathematical Modeling is set up module 202, analog module 203 and adjusting module 204;
Described structural model is set up module 201, be used for the design parameter according to the quadrangle tangential circle pulverized-coal fired boiler, according to the structure in DC burner, furnace hopper zone, burner region, burner upper area and pendant superheater zone, set up the gridding structural model of described boiler;
Described Mathematical Modeling is set up module 202, is used for according to described gridding structural model, sets up the Mathematical Modeling of the formed gas phase turbulance flow process of coal dust firing, two flow process of gas-solid, radiant heat transfer process and nitrogen oxide generative process;
Described analog module 203 is used for according to the described Mathematical Modeling of setting up, and the process of coal combustion that described boiler changes after the coal-fired kind is simulated, the various burners that the obtain described boiler corresponding relation between situation and the boiler combustion performance indications of exerting oneself;
Described adjusting module 204 is used for according to the described corresponding relation that obtains, and the burner of described boiler is exerted oneself adjust, and makes described boiler satisfy default combustibility index.
As one of them embodiment, described boiler combustion performance indications comprise coal dust burn-off rate, unburned carbon in flue dust, nitrogen oxide emission and lower hearth outlet temperature.
In simulation process, the combustibility index of analysis is more many, and is more high in the accuracy rate that boiler operatiopn is controlled, and security is also more good, and follow-up engineering practice is more had directive significance.
As one of them embodiment, also comprise alarm module;
Described alarm module is used for the running at described boiler, when the boiler combustion performance indications surpass default alarm index, sends alarm signal.
When the boiler combustion performance indications surpass default alarm index, report to the police, can guarantee the security of boiler control to a greater degree.
Compare with general technology, pulverized-coal fired boiler of the present invention changes burner after the coal-fired kind Adjustment System of exerting oneself and sets up the Mathematical Modeling corresponding with formed each physical and chemical processes of coal dust firing, the various burners that adopt the method for numerical simulation the to obtain described boiler corresponding relation between situation and the boiler combustion performance indications of exerting oneself, and according to the described corresponding relation that obtains, the burner of described boiler exerted oneself adjust, make described boiler satisfy default combustibility index.The present invention is weak point consuming time in the numerical simulation process, and it is low to assess the cost, and do not need the regulation and control at power plant scene to cooperate in the implementation procedure, and analog result has good visuality.The present invention can improve pulverized-coal fired boiler and change accuracy rate and the security that coal-fired kind afterburner is exerted oneself and controlled, overcome and adopted the unstable and low problem of efficiency of combustion of stove internal combustion that Artificial Control caused easily, greatly reduced the pollutant that produces in the combustion process simultaneously.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a pulverized-coal fired boiler changes burner after the coal-fired kind method of adjustment of exerting oneself, and it is characterized in that, may further comprise the steps:
According to the design parameter of quadrangle tangential circle pulverized-coal fired boiler, according to the structure in DC burner, furnace hopper zone, burner region, burner upper area and pendant superheater zone, set up the gridding structural model of described boiler;
According to described gridding structural model, set up the Mathematical Modeling of the formed gas phase turbulance flow process of coal dust firing, two flow process of gas-solid, radiant heat transfer process and nitrogen oxide generative process;
According to the described Mathematical Modeling of setting up, the process of coal combustion that described boiler changes after the coal-fired kind is simulated the various burners that the obtain described boiler corresponding relation between situation and the boiler combustion performance indications of exerting oneself;
According to the described corresponding relation that obtains, the burner of described boiler exerted oneself adjust, make described boiler satisfy default combustibility index.
2. pulverized-coal fired boiler according to claim 1 changes burner after the coal-fired kind method of adjustment of exerting oneself, it is characterized in that, in the step of the described gridding structural model of setting up described boiler, described design parameter comprises evaporation capacity, main steam pressure, main steam temperature, reheated steam flow, reheated steam inlet pressure, reheated steam outlet pressure, reheated steam inlet temperature, reheated steam outlet temperature, feed temperature, exhaust gas temperature, hot blast temperature, boiler efficiency, calculated fuel consumption, actual fuel consumption and burner design parameter.
3. pulverized-coal fired boiler according to claim 2 changes burner after the coal-fired kind method of adjustment of exerting oneself, and it is characterized in that described burner design parameter comprises that wind, secondary wind, tertiary air, wind surrounding air, tertiary air surrounding air and a burner hearth leak out.
4. pulverized-coal fired boiler according to claim 1 changes burner after the coal-fired kind method of adjustment of exerting oneself, and it is characterized in that the coal-fired kind after described boiler changes is bituminous coal.
5. pulverized-coal fired boiler according to claim 1 changes burner after the coal-fired kind method of adjustment of exerting oneself, and it is characterized in that described boiler combustion performance indications comprise coal dust burn-off rate, unburned carbon in flue dust, nitrogen oxide emission and lower hearth outlet temperature.
6. pulverized-coal fired boiler according to claim 1 changes burner after the coal-fired kind method of adjustment of exerting oneself, and it is characterized in that, after described burner to described boiler is exerted oneself the step of adjusting, may further comprise the steps:
In the running of described boiler, when the boiler combustion performance indications surpass default alarm index, then send alarm signal.
7. pulverized-coal fired boiler according to claim 1 changes burner after the coal-fired kind method of adjustment of exerting oneself, it is characterized in that, after the step of the described Mathematical Modeling of setting up the formed gas phase turbulance flow process of coal dust firing, two flow process of gas-solid, radiant heat transfer process and nitrogen oxide generative process, may further comprise the steps:
According to the described Mathematical Modeling of setting up, the process of coal combustion that described boiler changes after the coal-fired kind is simulated, obtained at exert oneself corresponding relation between situation lower hearth mean temperature, oxygen amount, carbon monoxide growing amount and formation of nitrogen oxides and the furnace height of various burners.
8. a pulverized-coal fired boiler changes burner after the coal-fired kind Adjustment System of exerting oneself, and it is characterized in that, comprises that structural model is set up module, Mathematical Modeling is set up module, analog module and adjusting module;
Described structural model is set up module, be used for the design parameter according to the quadrangle tangential circle pulverized-coal fired boiler, according to the structure in DC burner, furnace hopper zone, burner region, burner upper area and pendant superheater zone, set up the gridding structural model of described boiler;
Described Mathematical Modeling is set up module, is used for according to described gridding structural model, sets up the Mathematical Modeling of the formed gas phase turbulance flow process of coal dust firing, two flow process of gas-solid, radiant heat transfer process and nitrogen oxide generative process;
Described analog module is used for according to the described Mathematical Modeling of setting up, and the process of coal combustion that described boiler changes after the coal-fired kind is simulated, the various burners that the obtain described boiler corresponding relation between situation and the boiler combustion performance indications of exerting oneself;
Described adjusting module is used for according to the described corresponding relation that obtains, and the burner of described boiler is exerted oneself adjust, and makes described boiler satisfy default combustibility index.
9. pulverized-coal fired boiler according to claim 8 changes burner after the coal-fired kind Adjustment System of exerting oneself, and it is characterized in that described boiler combustion performance indications comprise coal dust burn-off rate, unburned carbon in flue dust, nitrogen oxide emission and lower hearth outlet temperature.
10. pulverized-coal fired boiler according to claim 8 changes burner after the coal-fired kind Adjustment System of exerting oneself, and it is characterized in that, also comprises alarm module;
Described alarm module is used for the running at described boiler, when the boiler combustion performance indications surpass default alarm index, sends alarm signal.
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Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee after: ELECTRIC POWER RESEARCH INSTITUTE, GUANGDONG POWER GRID CO., LTD. Address before: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee before: Electrical Power Research Institute of Guangdong Power Grid Corporation |