CN108151007A - Solve the sequence starting method of Process In A Tangential Firing Nonlinear thermal deviation - Google Patents

Solve the sequence starting method of Process In A Tangential Firing Nonlinear thermal deviation Download PDF

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Publication number
CN108151007A
CN108151007A CN201711249026.XA CN201711249026A CN108151007A CN 108151007 A CN108151007 A CN 108151007A CN 201711249026 A CN201711249026 A CN 201711249026A CN 108151007 A CN108151007 A CN 108151007A
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CN
China
Prior art keywords
burner
thermal deviation
boiler
flow
sequence
Prior art date
Application number
CN201711249026.XA
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Chinese (zh)
Inventor
杨茉
刘文华
李瑞琦
李钰冰
王文帅
杨丽泉
彭威
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上海理工大学
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Application filed by 上海理工大学 filed Critical 上海理工大学
Priority to CN201711249026.XA priority Critical patent/CN108151007A/en
Publication of CN108151007A publication Critical patent/CN108151007A/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C5/00Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
    • F23C5/08Disposition of burners
    • F23C5/32Disposition of burners to obtain rotating flames, i.e. flames moving helically or spirally
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N5/00Systems for controlling combustion

Abstract

The present invention relates to a kind of sequence starting methods for solving Process In A Tangential Firing Nonlinear thermal deviation, first, initial fields are established by changing the opening sequence of the burner in boiler on four angles, change burning device boundary condition in the process of running again, adjust the circle of contact center in burner hearth, the temperature field formed so as to adjust the flame of boiler furnace inner burner and uneven and asymmetric, the reduction even elimination thermal deviation in flow field.The change burning device boundary condition includes the flow for adjusting burner, space angle, opening time, opening sequence, to predict circle of contact center.Compared with prior art, the present invention fundamental difference is that the Nonlinear Mechanism generated for the first time from thermal deviation proposes to reduce the scheme of thermal deviation.For the present invention by the opening sequence of change burning device, incident angle adjusts initial fields, so as to adjust boiler furnace inner burner the temperature field that is formed of flame and flow field it is uneven and asymmetric, reduce and even eliminate thermal deviation.

Description

Solve the sequence starting method of Process In A Tangential Firing Nonlinear thermal deviation
Technical field
The present invention relates to a kind of Process In A Tangential Firings, especially a kind of to be used to solve Process In A Tangential Firing Nonlinear thermal deviation Method.
Background technology
Boiler furnace thermal deviation seriously affects safe and economical boiler operation, and the reason of causing this thermal deviation may have more Kind, one of major reason is that boiler furnace geometric dimension and physical arrangement are asymmetric, causes fume side Flow and heat flux Asymmetry, so as to which the heated asymmetry for making heating surface causes thermal deviation.But in actual operation, even if the physics knot of boiler furnace Structure and geometric parameter are full symmetric, but the temperature of burner hearth and speed are still asymmetric, larger thermal deviation occur.For pot Thermal deviation under the conditions of stove is full symmetric has various theoretical explanations at present.The theoretical foundation that the present invention uses be burner hearth flowing and Heat exchange has non-linear behavior, i.e. system under symmetrical structure may be asymmetrical, this theoretical foundation is not only the present invention Numerical simulation as a result, there is also experimental verification support.Foundation:Wu Qungang, Liang Xingang, Chen Zejing, Ren Jianxun are crossed and are increased member, The bifurcated experimental result of oblique air inlet mode solution, Tsinghua University's journal, producing under the experiment symmetrical structure in 1999 are asymmetric Flowing heat transfer result.And it is this non-linear, there is certainty accreditation in science inside the chaos etc..In addition to there are stable states pair Also there is oscillation and asymmetrical solution in the solution of title.
Prior art:Mainly there are three classes currently for the solution of Thermal Deviation of Boiler, the first kind is full symmetric Chamber structure;Second class is the stream passively changed according to the result of burner hearth thermal deviation in each pipe in the water-cooling wall in burner hearth Amount and the contact area of water-cooling wall and boiler etc., to adapt to and reduce the harm that thermal deviation is brought;Third class is to establish database Each operating mode in boiler operatiopn is collected, and records the Thermal Deviation of Boiler situation under each operating mode, it is minimum therefrom to choose thermal deviation Operating mode as boiler operatiopn operating mode.
The analysis of prior art, the verified appearance that can not avoid thermal deviation completely of first kind solution[, If Waigaoqiao of Shaihai ultra supercritical tower boiler burner hearth is exactly full symmetric, but still there are thermal deviations.Second class is to be directed to Thermal deviation generate as a result, being corrected.There are practical operation difficulties for solution.First, this kind of solution is not due to can The position of Accurate Prediction thermal deviation can cause not know specific how to distribute the flow in each pipe in water-cooling wall;Secondly, Flow is limited to the maximum stream flow adjusting that internal diameter of the pipeline and pump can distribute in pipe, is of limited application;Furthermore the tune of water-cooling wall Section can may finally influence the efficiency of boiler internal.Such as ZL200520042233.4《The steam flow for reducing Thermal Deviation of Boiler is fitted Orchestration》, the harm of thermal deviation is reduced by the method for changing flow in water screen tube.Such as CN105650629A《Eliminate external Heat exchanger hot working fluid deviation approach》, by the side for being not provided with not walking working medium in heat absorbing conduit or pipeline in generation thermal deviation position Method reduces the harm of thermal deviation.Third class solution belongs to passive and finds optimal case, and this scheme randomness is too big, is Raising accuracy rate, needs to allow the different operating modes of boiler operations as more as possible, this can cause the service life of boiler and operation stability Very big injury;Detection device is increased in boiler simultaneously, increases cost.Such as Zl201010174321.5 Utility Boiler Superheaters Reheater Auto Optimum-searching thermal deviation operating mode method.
Mainly there are three classes currently for the solution of Thermal Deviation of Boiler:
The first kind is full symmetric chamber structure;Second class is the stream changed in each pipe in the water-cooling wall in burner hearth Amount, to adapt to and reduce the harm that thermal deviation is brought;Third class is established database and is collected in boiler operatiopn under each operating mode Thermal Deviation of Boiler situation therefrom chooses the minimum operating mode of thermal deviation as boiler operatiopn operating mode.
The first kind be for boiler it is full symmetric under the conditions of boiler start and run, be current most popular side Case, but prove fundamentally solve the problems, such as thermal deviation by theoretical and engineering practice, this technical solution is at us Numerical computations in also further demonstrate unreliable, analog result is as follows:
Ultra supercritical tower boiler general arrangement as shown in Figure 1, the Three-dimensional Flow model taken out as shown in Fig. 2, stove Thorax upper outlet does not have furnace arch, furnace nose, and entire burner hearth is full symmetric about vertical center line.Consider that practical boiler has multilayer combustion device, but To simplify problem again without loss of generality, the model established herein only considers that a pair of of burner liquidates arrangement.Research is limited to cold conditions, list Phase, it is assumed that each burner uniform air intake (not differentiating between First air and Secondary Air), and put aside the SOFA wind burning of practical boiler The air inlet of device.
By comparing contoured velocity (Fig. 3 (a), (b), (c), (d)) and the profiling temperatures (figure of XY cross-section locations 4(a)、(b)、(c)、(d)).It can be found that using laminar model or turbulence model, in the range of design parameter, burner hearth In flow field there is asymmetry.Since symmetrical structure problem certainly exists a symmetric solution, and numerical result acquisition is non- Symmetric solution, it was demonstrated that at least there are the steady-state solution presence of 2 or more, therefore Bifurcation occur.
Compared with the second class technical solution, the present invention has predictable and better operability, to existing equipment Change is less.
Third class solution belongs to passive and finds optimal case, spends a large amount of manpower and financial resources.
Invention content
The present invention is to provide for a kind of sequence starting method for solving Process In A Tangential Firing Nonlinear thermal deviation, for adjusting Temperature field that the flame of boiler furnace inner burner is formed and flow field it is uneven and asymmetric, reduce and even eliminate heat partially Difference.
To achieve the above object, the technical scheme is that:A kind of solution Process In A Tangential Firing Nonlinear thermal deviation Sequence starting method first, initial fields is established, then transporting by changing the opening sequence of the burner in boiler on four angles Change burning device boundary condition during row adjusts the circle of contact being located in burner hearth formed by the angle of four burner settings Center, so as to adjust boiler furnace inner burner the temperature field that is formed of flame and flow field it is uneven and asymmetric, It reduces and even eliminates thermal deviation.
The change burning device boundary condition includes the flow for adjusting burner, space angle, and the opening time opens suitable Sequence, to predict circle of contact center.
The sequence starting method for solving Process In A Tangential Firing Nonlinear thermal deviation can also use change burning device cloth It puts mode, change burning device Inlet Fuel and air stoichiometry and adjusts volume of air supply.
The beneficial effects of the invention are as follows:
Compared with prior art, the present invention fundamental difference is that the Nonlinear Mechanism generated for the first time from thermal deviation proposes Reduce the scheme of thermal deviation.For the present invention by the opening sequence of change burning device, incident angle adjusts initial fields, so as to adjust Temperature field that the flame of boiler furnace inner burner is formed and flow field it is uneven and asymmetric, reduce and even eliminate heat partially Difference.
Description of the drawings
Fig. 1 is existing ultra supercritical tower boiler general arrangement;
Fig. 2 is the Three-dimensional Flow illustraton of model taken out;
Fig. 3 is each XY cross-section locations contoured velocity in hearth combustion;
Wherein:(a), (b), (c), (d) are followed successively by XY cross sections one to four,
Fig. 4 is each XY cross-section locations temperature isopleth in hearth combustion;
Wherein:(a), (b), (c), (d) are followed successively by XY cross sections one to four,
Fig. 5 is burner hearth cross section burner arrangement figure;
Fig. 6 is symmetrical boundary condition circle of contact center schematic diagram;
Fig. 7 is that C angles burner list opens speed flowing field figure in embodiment;
Fig. 8 is C-B angles burner opening speed flow field figure in embodiment;
Fig. 9 is C-B-A angles burner opening speed flow field figure;
Figure 10 is C-B-A-D angles burner opening speed flow field figure;
Speed flowing field figure after Figure 11 accelerates for C angles burner.
Specific embodiment
The invention will be further described with embodiment for lower combination attached drawing.
The sequence starting method of the solution Process In A Tangential Firing Nonlinear thermal deviation of the present invention, including:
(1) by changing boiler initial fields, the velocity field in boiler and temperature field are reconstructed.
(2) change burning device boundary condition in operational process, adjustment circle of contact center.
(3) space angle that each burner is opened.
(4) flow that each burner is opened.
(5) time that each burner is opened.
The sequence that (6) four burners are opened.
(7) space angle that burner is opened, flow, time, the coupling of sequence and prediction of result.
Technical solution of the present invention elaborates:
The present invention is for Process In A Tangential Firing, shown in the arrangement below figure (Fig. 5) of the burner in boiler, A in Figure 5, What the location arrangements at tetra- angles of B, C, D is four burners, and as shown in Figure 5, specially A and B's angle of burner burn The angle that device is formed with upper wall surface is respectively 39 ° and 51 °, and the angle that C and D are formed with lower wall surface is respectively 51 ° and 39 °.AB long It spends for 21480mm, CD length is 21480mm, and the circle of contact ideally formed can be located at burner hearth center, and tangential circle diameter be 290.47mm。
Due to non-linear, the position of the circle of contact can significantly shift, and then cause boiler that thermal deviation occurs.Such as Fig. 6 Shown, when the full symmetric unlatching of corner burner boundary condition, lower left C is significantly biased in Fig. 6 it can be seen that circle of contact center Angle burner causes section of burner hearth temperature distributing disproportionation.
The present invention establishes just field, adjustment circle of contact position by the method for change burning device opening sequence, and then avoids hot inclined Difference, specific technical solution implementation example of the present invention are as follows:
One) sequence starting
1) first burner is opened, first initial fields (C) is built, sees Fig. 7;
2) second burner (C-B) is opened, sees Fig. 8;
3) third burner (C-B-A) is opened, sees Fig. 9;
4) the 4th burner (C-B-A-D) is opened, sees Figure 10.
Corner burner is gradually opened, and A angles are significantly biased at visible practical circle of contact center after flow field is stablized, and in the theoretical circle of contact The non-overlapping region of the heart, this illustrates that the foundation of initial value field directly affects final non-linear result.And our technologies it is crucial just It is the flow that burner is such as adjusted by changing burner hearth initial fields, space angle, the opening time, opening sequence etc., to predict simultaneously The position of the circle of contact is adjusted, and then the operation in Practical Project is instructed to adjust.From above-mentioned steps it can be found that the unlatching of burner is suitable Sequence, the change that the position of the circle of contact can be caused to occur really.
(2) change incidence rate
When corner burner speed is 25m/s stable, C angular direction (as shown in Figure 6) is biased at circle of contact center, herein On the basis of C angles burner velocity is individually increased into 27.3m/s by 25m/s, other burner velocities remain unchanged, calculate stablize Result is as shown in figure 11 afterwards.It can be seen from fig. 11 that compared with Fig. 6, original is cut in circle of contact center significantly to A angular variation after speedup Range is also substantially at theoretical center circle of contact position.Whole flow field is well-balanced, the safety problems such as will not whitewash a wall part caused by speedup.
More than result of calculation shows that the opening sequence by burner, speed etc. can be realized and changes circle of contact centre bit The purpose put.
The sequence starting method of the solution Process In A Tangential Firing Nonlinear thermal deviation of the present invention can also use change burning Device arrangement, change burning device Inlet Fuel and air stoichiometry and adjusting volume of air supply.
The advanced of the scientific theory of the present invention illustrates:
First, the deficiency of the scientific basis of the prior art:
Traditional concept is:Firstth, the system under symmetrical structure must be symmetrical.So thermal deviation is eliminated structure That does is symmetrical.Secondth, deterministic system solution is unique.
During practical engineering application, we get used to the mode of thinking problem analysis of linear system, many non-linear phenomena quilts Ignore or even handled in a manner of a kind of mistake.Such as:
(1) the flickering of flame, the asymmetric flow field in symmetrical burner hearth, the rotation of axial symmetry channel, deflection, are all non-linear Phenomenon is objectively necessary being.Flowing and heat transfer (including burning) system, are Kind of Nonlinear Dynamical System, can occur Various non-linear phenomenas, generally there are multiple solutions.
(2) nonlinear system of symmetrical configuration, there are symmetric solutions, it is also possible to which there are asymmetric solutions.Symmetric solution is typically not Stable rather than symmetric solution is stable.Therefore, in Practical Project various power-equipments time of day, it is usually asymmetric 's.
(3) it in real engineering, is usually designed by symmetric solution.So virtual condition in engineering usually with design It is inconsistent.Asymmetric solution and its physics law are provided, has more practical application meaning in practice in engineering.Therefore, from non-linear Visual angle, some engineering problems can be solved.
Viewpoint before thinks, the full symmetric of boiler structure design, can theoretically eliminate thermal deviation.It is hot when occurring It also tends to look for reason in terms of structural symmetry during deviation.But there is hot inclined for many holohedral symmetry furnace boilers run at present Difference, after blowing out, even if burner etc. is adjusted to the geometric position identical with before blowing out and physical state before igniting again, It cannot still make flame kernel identical with position before, and reason is unknown.So we have proposed new ideas:Under symmetrical structure System may be asymmetrical.It can be asymmetric so eliminating thermal deviation structure.Deterministic system can solve more.
The advance of the scientific theory of the present invention:
The viewpoint of the present invention:Due to non-linear, in symmetrical structure, exactly temperature field is asymmetrical, this may be hair One of the reason of heat deviation.
The new design road of the present invention:
(1) boiler design can be made into thermal deviation smaller into asymmetrical.By non-thread Journal of Sex Research, predict which type of is non- Symmetrical structure, thermal deviation are small.
(2) burner quadrangle tangential circle is arranged, but the practical circle of contact is centainly at center, and at least there are four different solutions. It needs to study, there is several solutions, what solution is.This is obviously of great significance.If there are four solving, which engineering virtual condition is It is aNo one proposed, but its necessary being before this problem.
(3) how boiler is being controlled in desired state, it is proposed that:There are problems that solving more;Accurately to control reality Border state
The present invention uses new design road:Initial value field is changed by the sequence starting of change burning device, boundary condition etc., and then Reduce influence of the non-linear phenomena to engineering operation.
In addition, following two new technologies are also proposed based on nonlinear viewpoint:
(1) burner outlet flowing law problem;
(2) boiler wind speed adjustment optimal control burning and pollutant;
Since boiler is nonlinear system, so it is to complete the premise of above-mentioned work to solve nonlinear problem.

Claims (3)

  1. A kind of 1. sequence starting method for solving Process In A Tangential Firing Nonlinear thermal deviation, it is characterised in that:First, pass through change The opening sequence of burner in boiler on four angles establishes initial fields, then change burning device perimeter strip in the process of running Part adjusts the circle of contact center being located in burner hearth formed by the angle of four burner settings, so as to adjust Boiler Furnace The temperature field and uneven and asymmetric, the reduction even elimination thermal deviation in flow field that the flame of chamber inner combustion device is formed.
  2. 2. the sequence starting method according to claim 1 for solving Process In A Tangential Firing Nonlinear thermal deviation, feature exist In:The change burning device boundary condition includes the flow for adjusting burner, and space angle, the opening time, opening sequence comes pre- Survey circle of contact center.
  3. 3. the sequence starting method according to claim 1 or 2 for solving Process In A Tangential Firing Nonlinear thermal deviation, feature It is:The sequence starting method for solving Process In A Tangential Firing Nonlinear thermal deviation can also use change burning device arrangement side Formula, change burning device Inlet Fuel and air stoichiometry and adjusting volume of air supply.
CN201711249026.XA 2017-12-01 2017-12-01 Solve the sequence starting method of Process In A Tangential Firing Nonlinear thermal deviation CN108151007A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110195860A (en) * 2019-06-03 2019-09-03 吉林大学 A kind of boiler corner tangential firing flame kernel offset adjustment method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110195860A (en) * 2019-06-03 2019-09-03 吉林大学 A kind of boiler corner tangential firing flame kernel offset adjustment method

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