CN105181515B - Detect the method and system of coal dust firing dynamic characteristics in boiler furnace - Google Patents
Detect the method and system of coal dust firing dynamic characteristics in boiler furnace Download PDFInfo
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Abstract
The present invention relates to a kind of method and system for detecting coal dust firing dynamic characteristics in boiler furnace.Wherein, method includes：Total burning time and the Secondary Air air distribution state for leaving burner hearth are injected to from burner nozzle according to default coal dust, sliding-model control is carried out to process of coal combustion, obtains the second burning time of several oxygen concentration sections, several temperature ranges, first burning time in each oxygen concentration section and each temperature range；Thermogravimetric analysis is carried out to the combustion process in each oxygen concentration section, obtains first parameter and the second parameter in each oxygen concentration section；Thermogravimetric analysis is carried out to the combustion process of each temperature range, obtains the 3rd parameter and the 4th parameter of each temperature range；Coal dust firing dynamic characteristics in boiler furnace is detected according to the first parameter, the second parameter, the 3rd parameter, the 4th parameter, the first burning time and the second burning time.
Description
Technical field
It is special more particularly to coal dust firing power in one kind detection boiler furnace the present invention relates to technical field of boiler combustion
The method and system of property.
Background technology
For large-scale power station pulverized-coal fired boiler, the fine or not kinetics of combustion on the one hand with coal dust of boiler combustion performance in itself is special
Property is relevant, and easily catch fire has higher efficiency of combustion and boiler thermal output with the coal of after-flame；Another aspect and the structure of boiler
It is relevant with air distribution mode, i.e., the configuration with residence time of the coal dust in boiler, volume heat load (i.e. ignition temperature) and oxygen amount
Relevant etc. factor, therefore, the efficiency of boiler is the result that coal couples with boiler structure.
The common method of detection coal dust firing dynamics has following several：
1) coal-fired regular industrial analyze data is utilized, the coal that volatile matter is high, ash content is low is the coal easily caught fire with after-flame,
The difficult coal caught fire with after-flame of coal that volatile matter is low, ash content is high.
2) combustion characteristics of DTG Study on Coal is utilized, i.e., the pulverized coal particle of certain mass and granularity is put into thermogravimetric analysis
Burnt in instrument, obtain thermal gravimetric analysis curve, derivative analysis curve and differential thermal analysis curve, and then judge the combustion characteristics of raw coal.
3) combustion test is carried out using One Dimensional Furnace, commerical test stove, burning of coal characteristic is detected according to burn test results.
Method 1) it is simple and practical, method of discrimination is often used for production scene, but reliability and resolution ratio is not high；Method 2) in fact
Room analysis method is tested, there is higher resolving power, but due to being not bound with the architectural characteristic of boiler, the phase being only used between coal
To comparing；Method 3) it is test method, resolving power is high, but test method is relative complex, and the combustion with fire coal on actual boiler
Burning characteristic still has certain gap.
At home and abroad, thermogravimetry is the common method for detecting coal dust firing dynamic characteristics, passes through coal dust or coal tar
Thermogravimetric analysis, catch fire steady combustion characteristic index and the burnout characteristic integrated discriminator index of coal are obtained, or other reflections are caught fire and fired
Most index, such as reflect the burnout index to catch fire with composite target-combustibility index of after-flame, coal of coal.
Thermogravimetry is generally analyzed in air atmosphere, therefore the coal sample being calculated steady combustion characteristic of catching fire refers to
Mark, burnout characteristic integrated discriminator index, combustibility index etc. are the combustion dynamic characteristics indexs under about 21% oxygen concentration.
These indexs have meaning relatively, still, because whole combustion process experience of the coal dust in boiler furnace is different
Oxygen concentration, i.e. coal dust firing final result are the synthesis that coal dust burns under different oxygen concentrations, different temperatures, if by coal dust firing
Process discretization, coal dust firing will undergo countless sections of small combustion processes, and these small combustion processes are presented as coal tar not
With burning of the oxygen concentration with a temperature of, existing various combustion characteristic indexes can not reflect this process.Moreover, two kinds or more
Combustion characteristics difference size of the kind coal under 21% oxygen concentration can not reflect that its combustion characteristics in boiler furnace is poor completely
Different size, reason are that Coal rank combustibility index difference under 21% oxygen concentration is with the difference under other oxygen concentrations
Different, i.e., the combustion characteristics of Coal rank is different to the sensitiveness of oxygen amount.Therefore, existing combustion characteristics index
Even if for relatively there is also deficiency.
The content of the invention
Based on this, it is necessary to the problem of not reflecting the combustion characteristics difference under different oxygen concentrations for prior art, carry
For a kind of method and system for detecting coal dust firing dynamic characteristics in boiler furnace.
The method of coal dust firing dynamic characteristics, comprises the following steps in a kind of detection boiler furnace：
Total burning time and the Secondary Air air distribution shape for leaving burner hearth are injected to from burner nozzle according to default coal dust
State, sliding-model control is carried out to process of coal combustion, it is dense to obtain several oxygen concentration sections, several temperature ranges, each oxygen
Spend first burning time in section and the second burning time of each temperature range；
Thermogravimetric analysis is carried out to the combustion process in each oxygen concentration section, obtain each oxygen concentration section the first parameter and
Second parameter；Wherein, first parameter represents catch fire steady combustion characteristic of the coal dust in each oxygen concentration section, the second parameter list
Show burnout characteristic of the coal dust in each oxygen concentration section；
Thermogravimetric analysis is carried out to the combustion process of each temperature range, obtains the 3rd parameter and the 4th of each temperature range
Parameter；Wherein, the 3rd parameter represents catch fire steady combustion characteristic of the coal dust in each temperature range, and the 4th parameter represents coal dust
Burnout characteristic in each temperature range；
Examined according to the first parameter, the second parameter, the 3rd parameter, the 4th parameter, the first burning time and the second burning time
Survey coal dust firing dynamic characteristics in boiler furnace.
The system of coal dust firing dynamic characteristics in a kind of detection boiler furnace, including：
Discrete block, left for being injected to according to default coal dust from burner nozzle burner hearth total burning time and
Secondary Air air distribution state, sliding-model control is carried out to process of coal combustion, obtains several oxygen concentration sections, several humidity provinces
Between, the second burning time of first burning time in each oxygen concentration section and each temperature range；
First thermogravimetric analysis module, for carrying out thermogravimetric analysis to the combustion process in each oxygen concentration section, obtain each
First parameter and the second parameter in oxygen concentration section；Wherein, first parameter represents coal dust in each oxygen concentration section
Catch fire and surely fire characteristic, the second parameter represents burnout characteristic of the coal dust in each oxygen concentration section；
Second thermogravimetric analysis module, for carrying out thermogravimetric analysis to the combustion process of each temperature range, obtain each temperature
Spend the 3rd parameter and the 4th parameter in section；Wherein, the 3rd parameter represents coal dust catching fire surely in each temperature range
Characteristic is fired, the 4th parameter represents burnout characteristic of the coal dust in each temperature range；
Detection module, for according to the first parameter, the second parameter, the 3rd parameter, the 4th parameter, the first burning time and
Coal dust firing dynamic characteristics in two burning times detection boiler furnace.
The method and system of coal dust firing dynamic characteristics in above-mentioned detection boiler furnace, by being carried out to process of coal combustion
Sliding-model control, obtain several oxygen concentration sections, several temperature ranges, each oxygen concentration section the first burning time with
And the second burning time of each temperature range；Thermogravimetric analysis is carried out to the combustion process in each oxygen concentration section, obtained each
First parameter and the second parameter in oxygen concentration section；Thermogravimetric analysis is carried out to the combustion process of each temperature range, obtained each
3rd parameter of temperature range and the 4th parameter；According to the first parameter, the second parameter, the 3rd parameter, the 4th parameter, the first burning
Coal dust firing dynamic characteristics in time and the second burning time detection boiler furnace, can reflect coal dust in different oxygen concentrations and temperature
Combustion characteristics difference under degree, the detection to coal dust firing dynamic characteristics in boiler furnace is more accurately and reliably.
Brief description of the drawings
Fig. 1 is the method flow diagram of coal dust firing dynamic characteristics in the detection boiler furnace of one embodiment；
Fig. 2 is burner arrangement schematic diagram；
Fig. 3 is the structural representation of the system of coal dust firing dynamic characteristics in the detection boiler furnace of one embodiment；
Fig. 4 is the structural representation of the discrete block of one embodiment；
Fig. 5 is the structural representation of the detection module of one embodiment.
Embodiment
The embodiment of the method for coal dust firing dynamic characteristics in the detection boiler furnace of the present invention is entered below in conjunction with the accompanying drawings
Row description.
Fig. 1 is the method flow diagram of coal dust firing dynamic characteristics in the detection boiler furnace of one embodiment.Such as Fig. 1 institutes
Show, the method for coal dust firing dynamic characteristics may include following steps in detection boiler furnace of the invention：
S1, total burning time and the Secondary Air air distribution for leaving burner hearth are injected to from burner nozzle according to default coal dust
State, sliding-model control is carried out to process of coal combustion, obtains several oxygen concentration sections, several temperature ranges, each oxygen
First burning time of concentration ranges and the second burning time of each temperature range；
S2, thermogravimetric analysis is carried out to the combustion process in each oxygen concentration section, obtain first ginseng in each oxygen concentration section
Number and the second parameter；Wherein, first parameter represents catch fire steady combustion characteristic of the coal dust in each oxygen concentration section, the second ginseng
Number represents burnout characteristic of the coal dust in each oxygen concentration section；
S3, thermogravimetric analysis is carried out to the combustion process of each temperature range, obtain each temperature range the 3rd parameter and
4th parameter；Wherein, the 3rd parameter represents catch fire steady combustion characteristic of the coal dust in each temperature range, and the 4th parameter represents
Burnout characteristic of the coal dust in each temperature range；
S4, according to the first parameter, the second parameter, the 3rd parameter, the 4th parameter, the first burning time and the second burning time
Detect coal dust firing dynamic characteristics in boiler furnace.
During Actual combustion, the coal dust of different burners enters the position difference of boiler furnace so that its whole combustion
The oxygen concentration field and temperature field that burning process is passed through are different.In step sl, burner can be drawn according to the absolute altitude of burner
If it is divided into dried layer；According to the temperature field in burner stove tank and speed field distribution, estimate the oxygen concentration of every layer of burner, temperature and
Burning time；According to the oxygen concentration and the value of temperature, it is dense that the oxygen concentration, temperature and burning time are divided into several oxygen
Spend section and several temperature ranges；Calculate first burning time in each oxygen concentration section respectively further according to the burning time
And the second burning time of each temperature range.
In one embodiment, burner can be divided into multiple layers shown in Fig. 2.Take Fig. 2 certain grain of B layer burners
As object, it is injected to from burner nozzle leaves total burning time of burner hearth and is set to 2.0s (time is because of stove the coal dust in footpath
Thorax structure and it is different, be usually no more than 3.0s, 2.0s is one and rational assumed).According to Secondary Air air distribution state, coal dust firing mistake
Journey can discrete be：
B layers coal dust sprays into：
(1) 20.9%O2, ignition temperature are 1200 DEG C, burning time 0.05s；
(2) 5.0%O2, ignition temperature are 1300 DEG C, burning time 0.05s；
BC layers Secondary Air sprays into：
(3) 10.0%O2, ignition temperature are 1300 DEG C, burning time 0.05s；
(4) 4.0%O2, ignition temperature are 1350 DEG C, burning time 0.05s；
C layers coal dust sprays into：
(5) 3.0%O2, ignition temperature are 1400 DEG C, burning time 0.05s；
(6) 2.0%O2, ignition temperature are 1450 DEG C, burning time 0.05s；
CD layers Secondary Air sprays into：
(7) 8.0%O2, ignition temperature are 1500 DEG C, burning time 0.05s；
(8) 4.0%O2, ignition temperature are 1550 DEG C, burning time 0.05s；
D layers coal dust sprays into：
(9) 3.0%O2, ignition temperature are 1600 DEG C, burning time 0.05s；
(10) 2.0%O2, ignition temperature are 1600 DEG C, burning time 0.05s
OFA0 Secondary Airs spray into：
(11) 8.0%O2, ignition temperature are 1500 DEG C, burning time 0.05s；
(12) 4.0%O2, ignition temperature are 1500 DEG C, burning time 0.15s；
0FA1 Secondary Airs spray into：
(13) 8.0%O2, ignition temperature are 1400 DEG C, burning time 0.05s；
(14) 4.0%O2, ignition temperature are 1400 DEG C, burning time 0.05s；
0FA2 Secondary Airs spray into：
(13) 8.0%O2, ignition temperature are 1400 DEG C, burning time 0.1s；
(14) 6.0%O2, ignition temperature are 1350 DEG C, burning time 0.2s；
(15) 5.0%O2, ignition temperature are 1300 DEG C, burning time 0.3s；
(16) 4.0%O2, ignition temperature are 1200 DEG C, burning time 0.3s；
(17) 3.0%O2, ignition temperature are 1100 DEG C, burning time 0.3s.
By above-mentioned discrete, the discrete segment of coal dust different oxygen concentrations can be divided into：
20.9%O2, burning time 0.05s (accounting 2.5%)；
8%~10.0%O2, burning time 0.3s (accounting 15.0%)；
5.0%~6.0%O2, burning time 0.55s (accounting 27.5%)；
3%~4.0%O2, burning time 1.0s (accounting 50%)；
2%O2, burning time 0.1s (accounting 5%).
The discrete segment of coal dust different temperatures is divided into：
Ignition temperature is 1000 DEG C~1200 DEG C, burning time 0.65s (accounting 32.5%)；
Ignition temperature is 1200 DEG C~1450 DEG C, burning time 0.95s (accounting 47.5%)；
Ignition temperature is 1450 DEG C~1600 DEG C, burning time 0.4s (accounting 20%).
Under virtual condition, temperature, oxygen concentration and the burning time of each layer are not fixed, can according to the temperature field in burner hearth and
Speed field distribution, estimate a reasonable value.Temperature, oxygen concentration and the value of burning time of each layer will not affect that detection hereafter
Method.The division of oxygen concentration section and temperature range also can be according to virtual condition, and such as precise requirements divide.Oxygen concentration area
Between and the division of temperature range will not affect that detection method hereafter.For ease of description, hereafter come all in accordance with above-mentioned setting value
Calculate.
Thermogravimetric analysis can be carried out to the combustion process in each oxygen concentration section, obtain first parameter in each oxygen concentration section
With the second parameter；Wherein, first parameter represents catch fire steady combustion characteristic of the coal dust in each oxygen concentration section, the second parameter
Represent burnout characteristic of the coal dust in each oxygen concentration section.For example, first parameter and the second parameter can be respectively
Fiery steady combustion characteristic index and burnout characteristic integrated discriminator index (can be respectively hereafter with first parameter and the second parameter
Steady combustion characteristic index of catching fire and burnout characteristic integrated discriminator index are illustrated).Settable coal dust weight, coal powder size, test
Temperature range and heating rate；Determine the measurement atmosphere in each oxygen concentration section；And to the combustion process under each measurement atmosphere
Thermogravimetric analysis is carried out, obtains the first parameter and the second parameter under different measurement atmospheres.
In one embodiment, coal dust 10mg ± 0.1mg, coal powder size about 75um are can use, setting Range of measuring temp is
30~1100 DEG C, 40 DEG C/min of heating rate, measurement atmosphere uses N2+O2+CO2Simulation, carry out the heat of coal dust under different oxygen concentrations
Weight analysis.It can use oxygen concentration value corresponding to the midpoint in each oxygen concentration section and carry out thermogravimetric analysis：
O2Concentration 21%, CO2Concentration 0, remaining is N2, thermogravimetric analysis is carried out, calculating, which is caught fire, surely fires characteristic index Rw,1And combustion
Characteristic integrated discriminator index R to the greatest extentj,1。
O2Concentration 9%, CO2Concentration 12%, remaining is N2, thermogravimetric analysis is carried out, calculating, which is caught fire, surely fires characteristic index Rw,2With
Burnout characteristic integrated discriminator index Rj,2。
O2Concentration 5.5%, CO2Concentration 15.5%, remaining is N2, thermogravimetric analysis is carried out, calculating, which is caught fire, surely fires characteristic index
Rw,3With burnout characteristic integrated discriminator index Rj,3。
O2Concentration 3.5%, CO2Concentration 17.5%, remaining is N2, thermogravimetric analysis is carried out, calculating, which is caught fire, surely fires characteristic index
Rw,4With burnout characteristic integrated discriminator index Rj,4。
O2Concentration 2%, CO2Concentration 19%, remaining is N2, thermogravimetric analysis is carried out, calculating, which is caught fire, surely fires characteristic index Rw,5With
Burnout characteristic integrated discriminator index Rj,5。
Wherein, Range of measuring temp refers to the temperature that thermogravimetric analysis is being heated from beginning to warm up to terminating for 30~1100 DEG C,
It is corresponding with foregoing temperature range 1000 DEG C~1200 DEG C (temperature ranges during coal dust firing).
Thermogravimetric analysis can be carried out to the combustion process of each temperature range, obtain the 3rd parameter and the of each temperature range
Four parameters；Wherein, the 3rd parameter represents catch fire steady combustion characteristic of the coal dust in each temperature range, and the 4th parameter represents coal
Burnout characteristic of the powder in each temperature range.For example, the 3rd parameter and the 4th parameter can also be steady combustion of catching fire respectively
Characterisitic parameter and burnout characteristic integrated discriminator index.Settable coal dust weight, coal powder size, heating rate and measurement atmosphere；And
Thermogravimetric analysis is carried out to the combustion process of each temperature range, obtains the 3rd parameter and the 4th parameter in different temperatures section.
In one embodiment, coal dust 10mg ± 0.1mg is can use, coal powder size about 75um, setting measurement atmosphere is O2It is dense
Spend 21%, CO2Concentration 0, remaining is N2, carry out the thermogravimetric analysis of coal dust under different temperatures：
The Range of measuring temp that thermogravimetric analysis is being heated from beginning to warm up to terminating is 30~1100 DEG C, 40 DEG C of heating rate/
Min, thermogravimetric analysis is carried out, calculating, which is caught fire, surely fires characteristic index Rw,6With burnout characteristic integrated discriminator index Rj,6。
The Range of measuring temp that thermogravimetric analysis is being heated from beginning to warm up to terminating is 30~1300 DEG C, 40 DEG C of heating rate/
Min, thermogravimetric analysis is carried out, calculating, which is caught fire, surely fires characteristic index Rw,7With burnout characteristic integrated discriminator index Rj,7。
The Range of measuring temp that thermogravimetric analysis is being heated from beginning to warm up to terminating is 30~1500 DEG C, 40 DEG C of heating rate/
Min, thermogravimetric analysis is carried out, calculating, which is caught fire, surely fires characteristic index Rw,8With burnout characteristic integrated discriminator index Rj,8。
Wherein, Range of measuring temp is 30~1100 DEG C, 30~1300 DEG C and 30~1500 DEG C and refers to thermogravimetric analysis from opening
Begin be heated to terminate heating temperature, respectively with 1000 DEG C~1200 DEG C, 1200 DEG C~1450 DEG C foregoing of temperature range and
1450 DEG C~1600 DEG C (temperature range during coal dust firing) is corresponding.
Can be according to the first parameter, the second parameter, the 3rd parameter, the 4th parameter, the first burning time and the second burning time
Detect coal dust firing dynamic characteristics in boiler furnace.Each oxygen concentration section can be calculated according to first burning time first
First burning time weight；The second burning time weight of each temperature range is calculated according to the second burning time；Then, according to
First parameter, the second parameter, the 3rd parameter, the 4th parameter, the first burning time weight and the second burning time weight calculation
Five parameters and the 6th parameter；Wherein, the 5th parameter and the 6th parameter represent catch fire steady combustion characteristic and the after-flame of coal dust respectively
Characteristic；Finally, according to coal dust firing dynamic characteristics in the 5th parameter and the 6th parameter detecting boiler furnace.5th ginseng
Number and the 6th parameter can be respectively catch fire steady combustion characteristic overall target and burnout characteristic overall target.5th parameter and the 6th
Calculation method of parameters is as follows：
In formula, Rw zFor the 5th parameter, Rj zFor the 6th parameter, p1For influence of the oxygen concentration to coal dust firing dynamic characteristics index
The factor, p2Factor of influence for temperature to coal dust firing dynamic characteristics index, p1+p2=1；kiFor the of i-th of oxygen concentration section
One burning time weight, m are the number in oxygen concentration section,kjFor the second burning time power of j-th of temperature range
Weight, n are the number of burning temperature range,Rw,iFor first parameter in i-th of oxygen concentration section, Rw,jFor j-th of temperature
Spend the 3rd parameter in section, Rj,iFor second parameter in i-th of oxygen concentration section, Rj,jFor the 4th parameter of j-th of temperature range.
Following table gives the example calculation of the combustion dynamic characteristics composite index of two coals of A, B, according to the combustion of routine
Discriminant index is burnt, two coal combustion dynamic characteristics of A, B are very close；Differentiated according to the method for the present invention, B coals ratio
A coals are easier to catch fire and after-flame, and its reason is that A coals are more stronger to the sensitiveness of oxygen amount than B coal.
The method of coal dust firing dynamic characteristics has advantages below in the detection boiler furnace of the present invention：
(1) some sections of small combustion processes are turned to by process of coal combustion is discrete, embody coal dust in different oxygen concentrations and
At a temperature of combustion process；
(2) coal dust firing dynamic characteristics and boiler structure characteristic are combined, cannot be only used for comparing the combustion between Coal rank
Complexity is burnt, resolving power is high, and can be used for predicting coal dust combustion efficiency, is boiler coal mixing combustion and combustion control
Basis is provided；
(3) method is simple, can preferably reflect the coal-fired combustion characteristics on actual boiler.
The embodiment of the system of coal dust firing dynamic characteristics in the detection boiler furnace of the present invention is entered below in conjunction with the accompanying drawings
Row description.
Fig. 3 is the structural representation of the system of coal dust firing dynamic characteristics in the detection boiler furnace of one embodiment.Such as
Shown in Fig. 3, the system of coal dust firing dynamic characteristics may include in detection boiler furnace of the invention：
Discrete block 10, left for being injected to according to default coal dust from burner nozzle total burning time of burner hearth with
And Secondary Air air distribution state, sliding-model control is carried out to process of coal combustion, obtains several oxygen concentration sections, several temperature
Second burning time in section, first burning time in each oxygen concentration section and each temperature range；
First thermogravimetric analysis module 20, for carrying out thermogravimetric analysis to the combustion process in each oxygen concentration section, obtain each
First parameter and the second parameter in individual oxygen concentration section；Wherein, first parameter represents coal dust in each oxygen concentration section
Steady combustion characteristic of catching fire, the second parameter represents burnout characteristic of the coal dust in each oxygen concentration section；
Second thermogravimetric analysis module 30, for carrying out thermogravimetric analysis to the combustion process of each temperature range, obtain each
3rd parameter of temperature range and the 4th parameter；Wherein, the 3rd parameter represents coal dust catching fire in each temperature range
Steady combustion characteristic, the 4th parameter represent burnout characteristic of the coal dust in each temperature range；
Detection module 40, for according to the first parameter, the second parameter, the 3rd parameter, the 4th parameter, the first burning time and
Coal dust firing dynamic characteristics in second burning time detection boiler furnace.
As shown in figure 4, discrete block 10 may include：
First division unit 101, for the absolute altitude according to burner, if burner is divided into dried layer；
Evaluation unit 102, for according to the temperature field in burner stove tank and speed field distribution, estimating every layer of burner
Oxygen concentration, temperature and burning time；
Second division unit 103, for the value according to the oxygen concentration and temperature, by the oxygen concentration, temperature and burning
Time is divided into several oxygen concentration sections and several temperature ranges；
First computing unit 104, for calculating first burning in each oxygen concentration section respectively according to the burning time
Time and the second burning time of each temperature range.
As shown in figure 5, detection module 40 includes：
Second computing unit 401, for calculating first burning in each oxygen concentration section according to first burning time
Time weighting；The second burning time weight of each temperature range is calculated according to the second burning time；
3rd computing unit 402, for according to the first parameter, the second parameter, the 3rd parameter, the 4th parameter, the first burning
Time weighting and the parameter of the second burning time weight calculation the 5th and the 6th parameter；Wherein, the 5th parameter and the 6th parameter
Catch fire steady combustion characteristic and the burnout characteristic of coal dust are represented respectively；
Detection unit 403, for according to coal dust firing power in the 5th parameter and the 6th parameter detecting boiler furnace
Characteristic.
Wherein, detection unit 403 can calculate the 5th parameter and the 6th parameter according to equation below：
In formula, Rw zFor the 5th parameter, Rj zFor the 6th parameter, p1For influence of the oxygen concentration to coal dust firing dynamic characteristics index
The factor, p2Factor of influence for temperature to coal dust firing dynamic characteristics index, p1+p2=1；kiFor the of i-th of oxygen concentration section
One burning time weight, m are the number in oxygen concentration section,kjFor the second burning time power of j-th of temperature range
Weight, n are the number of burning temperature range,Rw,iFor first parameter in i-th of oxygen concentration section, Rw,jFor j-th of temperature
Spend the 3rd parameter in section, Rj,iFor second parameter in i-th of oxygen concentration section, Rj,jFor the 4th parameter of j-th of temperature range.
The system of coal dust firing dynamic characteristics has advantages below in the detection boiler furnace of the present invention：
(1) some sections of small combustion processes are turned to by process of coal combustion is discrete, embody coal dust in different oxygen concentrations and
At a temperature of combustion process；
(2) coal dust firing dynamic characteristics and boiler structure characteristic are combined, cannot be only used for comparing the combustion between Coal rank
Complexity is burnt, resolving power is high, and can be used for predicting coal dust combustion efficiency, is boiler coal mixing combustion and combustion control
Basis is provided；
(3) system architecture is simple, can preferably reflect the coal-fired combustion characteristics on actual boiler.
In the detection boiler furnace of the present invention in the system of coal dust firing dynamic characteristics and the detection boiler furnace of the present invention
The method of coal dust firing dynamic characteristics corresponds, the reality of the method for coal dust firing dynamic characteristics in above-mentioned detection boiler furnace
Apply the technical characteristic of example elaboration and its advantage is applied to the system of coal dust firing dynamic characteristics in detection boiler furnace
In embodiment, hereby give notice that.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that come for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (8)
- A kind of 1. method for detecting coal dust firing dynamic characteristics in boiler furnace, it is characterised in that comprise the following steps：Total burning time and the Secondary Air air distribution state for leaving burner hearth are injected to from burner nozzle according to default coal dust, it is right Process of coal combustion carries out sliding-model control, obtains several oxygen concentration sections, several temperature ranges, each oxygen concentration section The first burning time and each temperature range the second burning time；Thermogravimetric analysis is carried out to the combustion process in each oxygen concentration section, obtains first parameter and second in each oxygen concentration section Parameter；Wherein, first parameter represents catch fire steady combustion characteristic of the coal dust in each oxygen concentration section, and the second parameter represents coal Burnout characteristic of the powder in each oxygen concentration section；Thermogravimetric analysis is carried out to the combustion process of each temperature range, obtains the 3rd parameter and the 4th ginseng of each temperature range Number；Wherein, the 3rd parameter represents catch fire steady combustion characteristic of the coal dust in each temperature range, and the 4th parameter represents that coal dust exists Burnout characteristic in each temperature range；Pot is detected according to the first parameter, the second parameter, the 3rd parameter, the 4th parameter, the first burning time and the second burning time Coal dust firing dynamic characteristics in stove burner hearth；Sliding-model control is carried out to process of coal combustion, it is dense to obtain several oxygen concentration sections, several temperature ranges, each oxygen Spend section the first burning time and each temperature range the second burning time the step of include：According to the absolute altitude of burner, if burner is divided into dried layer；According to the temperature field in burner stove tank and speed field distribution, when estimating oxygen concentration, temperature and the burning of every layer of burner Between；According to the oxygen concentration and the value of temperature, the oxygen concentration, temperature and burning time are divided into several oxygen concentration areas Between and several temperature ranges；According to the burning time calculate respectively each oxygen concentration section the first burning time and each temperature range Two burning times.
- 2. the method for coal dust firing dynamic characteristics in detection boiler furnace according to claim 1, it is characterised in that according to In first parameter, the second parameter, the 3rd parameter, the 4th parameter, the first burning time and the second burning time detection boiler furnace The step of coal dust firing dynamic characteristics, includes：The first burning time weight in each oxygen concentration section is calculated according to first burning time；According to the second burning time Calculate the second burning time weight of each temperature range；Weighed according to the first parameter, the second parameter, the 3rd parameter, the 4th parameter, the first burning time weight and the second burning time The parameter of re-computation the 5th and the 6th parameter；Wherein, the 5th parameter and the 6th parameter represent that the steady combustion of catching fire of coal dust is special respectively Property and burnout characteristic；According to coal dust firing dynamic characteristics in the 5th parameter and the 6th parameter detecting boiler furnace.
- 3. the method for coal dust firing dynamic characteristics in detection boiler furnace according to claim 2, it is characterised in that described The computational methods of 5th parameter and the 6th parameter are as follows：<mrow> <msup> <msub> <mi>R</mi> <mi>w</mi> </msub> <mi>z</mi> </msup> <mo>=</mo> <msub> <mi>p</mi> <mn>1</mn> </msub> <mo>&times;</mo> <munderover> <mo>&Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>m</mi> </munderover> <mrow> <mo>(</mo> <msub> <mi>k</mi> <mi>i</mi> </msub> <mo>&times;</mo> <msub> <mi>R</mi> <mrow> <mi>w</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> <mo>)</mo> </mrow> <mo>+</mo> <msub> <mi>p</mi> <mn>2</mn> </msub> <mo>&times;</mo> <munderover> <mo>&Sigma;</mo> <mrow> <mi>j</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>n</mi> </munderover> <mrow> <mo>(</mo> <msub> <mi>k</mi> <mi>j</mi> </msub> <mo>&times;</mo> <msub> <mi>R</mi> <mrow> <mi>w</mi> <mo>,</mo> <mi>j</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow><mrow> <msup> <msub> <mi>R</mi> <mi>j</mi> </msub> <mi>z</mi> </msup> <mo>=</mo> <msub> <mi>p</mi> <mn>1</mn> </msub> <mo>&times;</mo> <munderover> <mo>&Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>m</mi> </munderover> <mrow> <mo>(</mo> <msub> <mi>k</mi> <mi>i</mi> </msub> <mo>&times;</mo> <msub> <mi>R</mi> <mrow> <mi>j</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> <mo>)</mo> </mrow> <mo>+</mo> <msub> <mi>p</mi> <mn>2</mn> </msub> <mo>&times;</mo> <munderover> <mo>&Sigma;</mo> <mrow> <mi>j</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>n</mi> </munderover> <mrow> <mo>(</mo> <msub> <mi>k</mi> <mi>j</mi> </msub> <mo>&times;</mo> <msub> <mi>R</mi> <mrow> <mi>j</mi> <mo>,</mo> <mi>j</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow>In formula, Rw zFor the 5th parameter, Rj zFor the 6th parameter, p1For influence of the oxygen concentration to coal dust firing dynamic characteristics index because Son, p2Factor of influence for temperature to coal dust firing dynamic characteristics index, p1+p2=1；kiFor the first of i-th of oxygen concentration section Burning time weight, m are the number in oxygen concentration section,kjFor the second burning time weight of j-th of temperature range, n For the number of burning temperature range,Rw,iFor first parameter in i-th of oxygen concentration section, Rw,jFor j-th of humidity province Between the 3rd parameter, Rj,iFor second parameter in i-th of oxygen concentration section, Rj,jFor the 4th parameter of j-th of temperature range.
- 4. the method for coal dust firing dynamic characteristics in detection boiler furnace according to claim 1, it is characterised in that to each The combustion process in individual oxygen concentration section carries out thermogravimetric analysis, obtains first parameter in each oxygen concentration section and the step of the second parameter Suddenly include：Coal dust weight, coal powder size, Range of measuring temp and heating rate parameter are set；Determine the measurement atmosphere in each oxygen concentration section；According to the coal dust weight of setting, coal powder size, Range of measuring temp and heating rate parameter, under each measurement atmosphere Combustion process carries out thermogravimetric analysis, obtains the first parameter and the second parameter under different measurement atmospheres.
- 5. the method for coal dust firing dynamic characteristics in detection boiler furnace according to claim 1, it is characterised in that to each The combustion process of individual temperature range carries out thermogravimetric analysis, and the step of obtaining the 3rd parameter and four parameters of each temperature range wraps Include：Coal dust weight, coal powder size, heating rate and measurement atmosphere parameter are set；According to the coal dust weight of setting, coal powder size, heating rate and measurement atmosphere parameter, to the burned of each temperature range Cheng Jinhang thermogravimetric analysis, obtain the 3rd parameter and the 4th parameter in different temperatures section.
- A kind of 6. system for detecting coal dust firing dynamic characteristics in boiler furnace, it is characterised in that including：Discrete block, total burning time of burner hearth and secondary is left for being injected to according to default coal dust from burner nozzle Wind air distribution state, to process of coal combustion carry out sliding-model control, obtain several oxygen concentration sections, several temperature ranges, First burning time in each oxygen concentration section and the second burning time of each temperature range；First thermogravimetric analysis module, for carrying out thermogravimetric analysis to the combustion process in each oxygen concentration section, it is dense to obtain each oxygen Spend first parameter and the second parameter in section；Wherein, first parameter represents coal dust catching fire in each oxygen concentration section Steady combustion characteristic, the second parameter represent burnout characteristic of the coal dust in each oxygen concentration section；Second thermogravimetric analysis module, for carrying out thermogravimetric analysis to the combustion process of each temperature range, obtain each humidity province Between the 3rd parameter and the 4th parameter；Wherein, the 3rd parameter represents that catch fire steady combustion of the coal dust in each temperature range is special Property, the 4th parameter represents burnout characteristic of the coal dust in each temperature range；Detection module, for according to the first parameter, the second parameter, the 3rd parameter, the 4th parameter, the first burning time and the second combustion Burn coal dust firing dynamic characteristics in time detecting boiler furnace；The discrete block includes：First division unit, for the absolute altitude according to burner, if burner is divided into dried layer；Evaluation unit, for according to the temperature field in burner stove tank and speed field distribution, estimate every layer of burner oxygen concentration, Temperature and burning time；Second division unit, for the value according to the oxygen concentration and temperature, the oxygen concentration, temperature and burning time are divided For several oxygen concentration sections and several temperature ranges；First computing unit, for calculated respectively according to the burning time each oxygen concentration section the first burning time and Second burning time of each temperature range.
- 7. the system of coal dust firing dynamic characteristics in detection boiler furnace according to claim 6, it is characterised in that described Detection module includes：Second computing unit, the first burning time for calculating each oxygen concentration section according to first burning time weigh Weight；The second burning time weight of each temperature range is calculated according to the second burning time；3rd computing unit, for according to the first parameter, the second parameter, the 3rd parameter, the 4th parameter, the first burning time weight With the parameter of the second burning time weight calculation the 5th and the 6th parameter；Wherein, the 5th parameter and the 6th parameter represent respectively Catch fire steady combustion characteristic and the burnout characteristic of coal dust；Detection unit, for according to coal dust firing dynamic characteristics in the 5th parameter and the 6th parameter detecting boiler furnace.
- 8. the system of coal dust firing dynamic characteristics in detection boiler furnace according to claim 7, it is characterised in that described 5th parameter and the 6th parameter calculate according to equation below：<mrow> <msup> <msub> <mi>R</mi> <mi>w</mi> </msub> <mi>z</mi> </msup> <mo>=</mo> <msub> <mi>p</mi> <mn>1</mn> </msub> <mo>&times;</mo> <munderover> <mo>&Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>m</mi> </munderover> <mrow> <mo>(</mo> <msub> <mi>k</mi> <mi>i</mi> </msub> <mo>&times;</mo> <msub> <mi>R</mi> <mrow> <mi>w</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> <mo>)</mo> </mrow> <mo>+</mo> <msub> <mi>p</mi> <mn>2</mn> </msub> <mo>&times;</mo> <munderover> <mo>&Sigma;</mo> <mrow> <mi>j</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>n</mi> </munderover> <mrow> <mo>(</mo> <msub> <mi>k</mi> <mi>j</mi> </msub> <mo>&times;</mo> <msub> <mi>R</mi> <mrow> <mi>w</mi> <mo>,</mo> <mi>j</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow><mrow> <msup> <msub> <mi>R</mi> <mi>j</mi> </msub> <mi>z</mi> </msup> <mo>=</mo> <msub> <mi>p</mi> <mn>1</mn> </msub> <mo>&times;</mo> <munderover> <mo>&Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>m</mi> </munderover> <mrow> <mo>(</mo> <msub> <mi>k</mi> <mi>i</mi> </msub> <mo>&times;</mo> <msub> <mi>R</mi> <mrow> <mi>j</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> <mo>)</mo> </mrow> <mo>+</mo> <msub> <mi>p</mi> <mn>2</mn> </msub> <mo>&times;</mo> <munderover> <mo>&Sigma;</mo> <mrow> <mi>j</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>n</mi> </munderover> <mrow> <mo>(</mo> <msub> <mi>k</mi> <mi>j</mi> </msub> <mo>&times;</mo> <msub> <mi>R</mi> <mrow> <mi>j</mi> <mo>,</mo> <mi>j</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow>In formula, Rw zFor the 5th parameter, Rj zFor the 6th parameter, p1For influence of the oxygen concentration to coal dust firing dynamic characteristics index because Son, p2Factor of influence for temperature to coal dust firing dynamic characteristics index, p1+p2=1；kiFor the first of i-th of oxygen concentration section Burning time weight, m are the number in oxygen concentration section,kjFor the second burning time weight of j-th of temperature range, N is the number of burning temperature range,Rw,iFor first parameter in i-th of oxygen concentration section, Rw,jFor j-th of humidity province Between the 3rd parameter, Rj,iFor second parameter in i-th of oxygen concentration section, Rj,jFor the 4th parameter of j-th of temperature range.
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