CN105181515A - Method and system for detecting combustion dynamic characteristics of pulverized coal in boiler hearth - Google Patents
Method and system for detecting combustion dynamic characteristics of pulverized coal in boiler hearth Download PDFInfo
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Abstract
The invention relates to a method and a system for detecting combustion dynamic characteristics of pulverized coal in a boiler hearth. The method comprises the following steps: performing discretization processing on a pulverized coal combustion process according to a preset total combustion time from injection of the pulverized coal through a burner nozzle to leaving from the hearth and a secondary air distribution state to obtain a plurality of oxygen concentration intervals, a plurality of temperature intervals, first combustion time of each oxygen concentration interval and second combustion time of each temperature interval; performing thermogravimetric analysis on a combustion process of each oxygen concentration interval to obtain a first parameter and a second parameter of each oxygen concentration interval; performing thermogravimetric analysis on a combustion process of each temperature interval to obtain a third parameter and a fourth parameter of each temperature interval; detecting the combustion dynamic characteristics of the pulverized coal in the boiler hearth according to the first parameter, the second parameter, the third parameter, the fourth parameter, the first combustion time and the second combustion time.
Description
Technical field
The present invention relates to technical field of boiler combustion, particularly relate to a kind of method and system detecting coal dust firing kinematic behavior in boiler furnace.
Background technology
For large-scale power station pulverized coal firing boiler, the quality of boiler combustion performance is on the one hand relevant with the combustion dynamics of coal dust itself, easily catches fire to have higher burning efficiency and boiler thermal output with the coal of after-flame; Relevant with air distribution mode with the structure of boiler on the other hand, the factors such as the configuration of the residence time namely with coal dust in boiler, volume heat load (i.e. temperature of combustion) and oxygen amount are relevant, therefore, the efficiency of boiler is the result that coal is coupled with boiler structure.
The common method detecting coal dust firing dynamics has following several:
1) utilize coal-fired regular industrial to analyze data, the coal that volatile matter is high, ash content is low is easily catch fire and the coal of after-flame, and the coal that volatile matter is low, ash content is high is difficult catches fire and the coal of after-flame.
2) utilize the combustion characteristics of thermogravimetry (TG) Study on Coal, the pulverized coal particle by certain mass and granularity is put into thermogravimetric analyzer and is burnt, and obtains thermal gravimetric analysis curve, derivative analysis curve and differential thermal analysis curve, and then passes judgment on the combustion characteristics of raw coal.
3) utilize One Dimensional Furnace, commerical test stove carries out burning test, detect burning of coal characteristic according to burn test results.
Method 1) simple and practical, for method of discrimination is commonly used in production scene, but reliability and resolution are not high; Method 2) be laboratory analysis methodologies, there is higher resolving power, but owing to there is no the architectural characteristic of bonded boiler, can only to be used between coal relatively; Method 3) be test method, resolving power is high, but test method relative complex, and still have certain gap with the combustion characteristics of fire coal on actual boiler.
At home and abroad, thermogravimetry is the common method detecting coal dust firing kinematic behavior, by the thermogravimetric analysis of coal dust or coal tar, obtain catch fire steady combustion characteristic index and the burnout characteristic integrated discriminator index of coal, or other reflections are caught fire and the index of after-flame, as catching fire and the composite target-combustibility index of after-flame, the burnout index etc. of coal of reflection coal.
Thermogravimetry is analyzed usually in air atmosphere, and the coal sample therefore calculated is caught fire and surely fired characteristic index, burnout characteristic integrated discriminator index, combustibility index etc. is all the combustion dynamic characteristics indexs under about 21% oxygen concentration.These indexs have meaning relatively, but, because the whole combustion process of coal dust in boiler furnace experiences different oxygen concentrations, namely coal dust firing net result be coal dust burn under different oxygen concentrations, different temperatures comprehensive, if by process of coal combustion discretize, coal dust firing is by the combustion process of experience countless sections little, and namely these little combustion processes are presented as the burning of coal tar under different oxygen concentrations and temperature, and existing various combustion characteristic index all cannot reflect this process.And, the combustion characteristics difference size of two or more coals under 21% oxygen concentration can not reflect the size of its combustion characteristics difference in boiler furnace completely, reason is Coal rank combustibility index difference under 21% oxygen concentration is different with the difference under other oxygen concentration, and namely the susceptibility of combustion characteristics to oxygen amount of Coal rank is different.Therefore, even if existing combustion characteristics index is used for relatively also Shortcomings.
Summary of the invention
Based on this, be necessary the problem not reflecting the combustion characteristics difference under different oxygen concentrations for prior art, a kind of method and system detecting coal dust firing kinematic behavior in boiler furnace is provided.
Detect a method for coal dust firing kinematic behavior in boiler furnace, comprise the following steps:
Coal dust according to presetting is injected to the total burning time and Secondary Air air distribution state of leaving burner hearth from burner nozzle, sliding-model control is carried out to process of coal combustion, obtains several oxygen concentration intervals, several temperature ranges, first burning time in each oxygen concentration interval and the second burning time of each temperature range;
Thermogravimetric analysis is carried out to the combustion process in each oxygen concentration interval, obtains the first parameter and second parameter in each oxygen concentration interval; Wherein, described first Parametric Representation coal dust catching fire in each oxygen concentration interval surely fires characteristic, the burnout characteristic of the second Parametric Representation coal dust in each oxygen concentration interval;
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; Wherein, described 3rd Parametric Representation coal dust catching fire in each temperature range surely fires characteristic, the burnout characteristic of the 4th Parametric Representation coal dust in each temperature range;
Coal dust firing kinematic behavior 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.
Detect a system for coal dust firing kinematic behavior in boiler furnace, comprising:
Discrete block, for being injected to according to the coal dust preset the total burning time and Secondary Air air distribution state of leaving burner hearth from burner nozzle, sliding-model control is carried out to process of coal combustion, obtains several oxygen concentration intervals, several temperature ranges, first burning time in each oxygen concentration interval 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 interval, obtains the first parameter and second parameter in each oxygen concentration interval; Wherein, described first Parametric Representation coal dust catching fire in each oxygen concentration interval surely fires characteristic, the burnout characteristic of the second Parametric Representation coal dust in each oxygen concentration interval;
Second thermogravimetric analysis module, for carrying out thermogravimetric analysis to the combustion process of each temperature range, obtains the 3rd parameter and the 4th parameter of each temperature range; Wherein, described 3rd Parametric Representation coal dust catching fire in each temperature range surely fires characteristic, the burnout characteristic of the 4th Parametric Representation 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 burning time detecting coal dust firing kinematic behavior in boiler furnace.
The method and system of coal dust firing kinematic behavior in above-mentioned detection boiler furnace, by carrying out sliding-model control to process of coal combustion, obtain several oxygen concentration intervals, several temperature ranges, first burning time in each oxygen concentration interval and the second burning time of each temperature range; Thermogravimetric analysis is carried out to the combustion process in each oxygen concentration interval, obtains the first parameter and second parameter in each oxygen concentration interval; 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 kinematic behavior 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, the combustion characteristics difference of coal dust under different oxygen concentrations and temperature can be reflected, to the detection of coal dust firing kinematic behavior in boiler furnace more accurately and reliably.
Accompanying drawing explanation
Fig. 1 be an embodiment detection boiler furnace in the method flow diagram of coal dust firing kinematic behavior;
Fig. 2 is burner arrangement schematic diagram;
Fig. 3 be an embodiment detection boiler furnace in the structural representation of system of coal dust firing kinematic behavior;
Fig. 4 is the structural representation of the discrete block of an embodiment;
Fig. 5 is the structural representation of the detection module of an embodiment.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the method for coal dust firing kinematic behavior in detection boiler furnace of the present invention is described.
Fig. 1 be an embodiment detection boiler furnace in the method flow diagram of coal dust firing kinematic behavior.As shown in Figure 1, in detection boiler furnace of the present invention, the method for coal dust firing kinematic behavior can comprise the following steps:
S1, coal dust according to presetting is injected to the total burning time and Secondary Air air distribution state of leaving burner hearth from burner nozzle, sliding-model control is carried out to process of coal combustion, obtains several oxygen concentration intervals, several temperature ranges, first burning time in each oxygen concentration interval and the second burning time of each temperature range;
S2, carries out thermogravimetric analysis to the combustion process in each oxygen concentration interval, obtains the first parameter and second parameter in each oxygen concentration interval; Wherein, described first Parametric Representation coal dust catching fire in each oxygen concentration interval surely fires characteristic, the burnout characteristic of the second Parametric Representation coal dust in each oxygen concentration interval;
S3, carries out thermogravimetric analysis to the combustion process of each temperature range, obtains the 3rd parameter and the 4th parameter of each temperature range; Wherein, described 3rd Parametric Representation coal dust catching fire in each temperature range surely fires characteristic, the burnout characteristic of the 4th Parametric Representation coal dust in each temperature range;
S4, detects coal dust firing kinematic behavior in boiler furnace according to the first parameter, the second parameter, the 3rd parameter, the 4th parameter, the first burning time and the second burning time.
In Actual combustion process, the coal dust of different burner enters the position difference of boiler furnace, makes the oxygen concentration field of its whole combustion process process and temperature field be different.In step sl, according to the absolute altitude of burner, burner can be divided into some layers; According to the temperature field in burner stove tank and velocity field distribution, estimate the oxygen concentration of every grate firing burner, temperature and burning time; According to the value of described oxygen concentration and temperature, described oxygen concentration, temperature and burning time are divided into interval and several temperature ranges of several oxygen concentrations; Again according to second burning time of the first burning time and each temperature range that calculate each oxygen concentration interval described burning time respectively.
In one embodiment, burner can be divided into the multiple layers shown in Fig. 2.Get the coal dust of the certain particle diameter of B grate firing burner of Fig. 2 as object, it is injected to from burner nozzle and is set to 2.0s (this time is different because of chamber structure, is generally no more than 3.0s, and 2.0s is a reasonably hypothesis) the total burning time leaving burner hearth.According to Secondary Air air distribution state, process of coal combustion can discretely be:
B layer coal dust sprays into:
(1) 20.9%O2, temperature of combustion is 1200 DEG C, burning time 0.05s;
(2) 5.0%O2, temperature of combustion is 1300 DEG C, burning time 0.05s;
BC layer Secondary Air sprays into:
(3) 10.0%O2, temperature of combustion is 1300 DEG C, burning time 0.05s;
(4) 4.0%O2, temperature of combustion is 1350 DEG C, burning time 0.05s;
C layer coal dust sprays into:
(5) 3.0%O2, temperature of combustion is 1400 DEG C, burning time 0.05s;
(6) 2.0%O2, temperature of combustion is 1450 DEG C, burning time 0.05s;
CD layer Secondary Air sprays into:
(7) 8.0%O2, temperature of combustion is 1500 DEG C, burning time 0.05s;
(8) 4.0%O2, temperature of combustion is 1550 DEG C, burning time 0.05s;
D layer coal dust sprays into:
(9) 3.0%O2, temperature of combustion is 1600 DEG C, burning time 0.05s;
(10) 2.0%O2, temperature of combustion is 1600 DEG C, burning time 0.05s
OFA0 Secondary Air sprays into:
(11) 8.0%O2, temperature of combustion is 1500 DEG C, burning time 0.05s;
(12) 4.0%O2, temperature of combustion is 1500 DEG C, burning time 0.15s;
0FA1 Secondary Air sprays into:
(13) 8.0%O2, temperature of combustion is 1400 DEG C, burning time 0.05s;
(14) 4.0%O2, temperature of combustion is 1400 DEG C, burning time 0.05s;
0FA2 Secondary Air sprays into:
(13) 8.0%O2, temperature of combustion is 1400 DEG C, burning time 0.1s;
(14) 6.0%O2, temperature of combustion is 1350 DEG C, burning time 0.2s;
(15) 5.0%O2, temperature of combustion is 1300 DEG C, burning time 0.3s;
(16) 4.0%O2, temperature of combustion is 1200 DEG C, burning time 0.3s;
(17) 3.0%O2, temperature of combustion is 1100 DEG C, burning time 0.3s.
Through above-mentioned discrete, the discrete segment of coal dust different oxygen concentrations can be divided into:
20.9%O2,0.05s burning time (accounting 2.5%);
8% ~ 10.0%O2,0.3s burning time (accounting 15.0%);
5.0% ~ 6.0%O2,0.55s burning time (accounting 27.5%);
3% ~ 4.0%O2,1.0s burning time (accounting 50%);
2%O2,0.1s burning time (accounting 5%).
The discrete segment of coal dust different temperatures is divided into:
Temperature of combustion is 1000 DEG C ~ 1200 DEG C, 0.65s burning time (accounting 32.5%);
Temperature of combustion is 1200 DEG C ~ 1450 DEG C, 0.95s burning time (accounting 47.5%);
Temperature of combustion is 1450 DEG C ~ 1600 DEG C, 0.4s burning time (accounting 20%).
Under virtual condition, temperature, the oxygen concentration of each layer and do not fix burning time, according to the temperature field in burner hearth and velocity field distribution, can estimate a reasonable value.The temperature of each layer, oxygen concentration and the value of burning time can not affect detection method hereafter.The division of the interval and temperature range of oxygen concentration also can according to virtual condition, as precise requirements etc. divides.Oxygen concentration division that is interval and temperature range can not affect detection method hereafter.For ease of describing, hereafter all calculate according to above-mentioned setting value.
Thermogravimetric analysis can be carried out to the combustion process in each oxygen concentration interval, obtain the first parameter and second parameter in each oxygen concentration interval; Wherein, described first Parametric Representation coal dust catching fire in each oxygen concentration interval surely fires characteristic, the burnout characteristic of the second Parametric Representation coal dust in each oxygen concentration interval.Such as, described first parameter and the second parameter can be catch fire steady combustion characteristic index and burnout characteristic integrated discriminator index (hereafter all can respectively be that catch fire steady combustion characteristic index and burnout characteristic integrated discriminator index set forth with described first parameter and the second parameter) respectively.Coal dust weight, coal powder size, Range of measuring temp and heating rate can be set; Determine the measurement atmosphere in each oxygen concentration interval; And thermogravimetric analysis is carried out to the combustion process under each measurement atmosphere, obtain the first parameter under different measurement atmosphere and the second parameter.
In one embodiment, desirable coal dust 10mg ± 0.1mg, coal powder size is about 75um, and arranging Range of measuring temp is 30 ~ 1100 DEG C, heating rate 40 DEG C/min, and measurement atmosphere uses N
2+ O
2+ CO
2simulation, carries out the thermogravimetric analysis of coal dust under different oxygen concentrations.The oxygen concentration value that the mid point in desirable each oxygen concentration interval is corresponding carries out thermogravimetric analysis:
O
2concentration 21%, CO
2concentration 0, all the other are N
2, carry out thermogravimetric analysis, calculate the steady combustion characteristic index R that catches fire
w, 1with burnout characteristic integrated discriminator index R
j, 1.
O
2concentration 9%, CO
2concentration 12%, all the other are N
2, carry out thermogravimetric analysis, calculate the steady combustion characteristic index R that catches fire
w, 2with burnout characteristic integrated discriminator index R
j, 2.
O
2concentration 5.5%, CO
2concentration 15.5%, all the other are N
2, carry out thermogravimetric analysis, calculate the steady combustion characteristic index R that catches fire
w, 3with burnout characteristic integrated discriminator index R
j, 3.
O
2concentration 3.5%, CO
2concentration 17.5%, all the other are N
2, carry out thermogravimetric analysis, calculate the steady combustion characteristic index R that catches fire
w, 4with burnout characteristic integrated discriminator index R
j, 4.
O
2concentration 2%, CO
2concentration 19%, all the other are N
2, carry out thermogravimetric analysis, calculate the steady combustion characteristic index R that catches fire
w, 5with burnout characteristic integrated discriminator index R
j, 5.
Wherein, Range of measuring temp be 30 ~ 1100 DEG C refer to thermogravimetric analysis from be heated to stop heating temperature, corresponding with aforesaid 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 4th parameter of each temperature range; Wherein, described 3rd Parametric Representation coal dust catching fire in each temperature range surely fires characteristic, the burnout characteristic of the 4th Parametric Representation coal dust in each temperature range.Such as, described 3rd parameter and the 4th parameter also can be catch fire steady combustion characterisitic parameter and burnout characteristic integrated discriminator index respectively.Coal dust weight, coal powder size, heating rate and measurement atmosphere can be set; And thermogravimetric analysis is carried out to the combustion process of each temperature range, obtain the 3rd parameter in different temperatures interval and the 4th parameter.
In one embodiment, desirable coal dust 10mg ± 0.1mg, coal powder size is about 75um, and arranging measurement atmosphere is O
2concentration 21%, CO
2concentration 0, all the other are N
2, carry out the thermogravimetric analysis of coal dust under different temperatures:
Thermogravimetric analysis to be heated to the Range of measuring temp stopping heating be 30 ~ 1100 DEG C, heating rate 40 DEG C/min, carries out thermogravimetric analysis, calculates the steady combustion characteristic index R that catches fire
w, 6with burnout characteristic integrated discriminator index R
j, 6.
Thermogravimetric analysis to be heated to the Range of measuring temp stopping heating be 30 ~ 1300 DEG C, heating rate 40 DEG C/min, carries out thermogravimetric analysis, calculates the steady combustion characteristic index R that catches fire
w, 7with burnout characteristic integrated discriminator index R
j, 7.
Thermogravimetric analysis to be heated to the Range of measuring temp stopping heating be 30 ~ 1500 DEG C, heating rate 40 DEG C/min, carries out thermogravimetric analysis, calculates the steady combustion characteristic index R that catches fire
w, 8with burnout characteristic integrated discriminator index R
j, 8.
Wherein, Range of measuring temp be 30 ~ 1100 DEG C, 30 ~ 1300 DEG C and 30 ~ 1500 DEG C refer to thermogravimetric analysis from be heated to stop heating temperature, corresponding with aforesaid temperature range 1000 DEG C ~ 1200 DEG C, 1200 DEG C ~ 1450 DEG C and 1450 DEG C ~ 1600 DEG C (temperature ranges during coal dust firing) respectively.
Coal dust firing kinematic behavior in boiler furnace can be detected according to the first parameter, the second parameter, the 3rd parameter, the 4th parameter, the first burning time and the second burning time.Can first according to calculate described first burning time each oxygen concentration interval first burning time weight; According to calculate for the second burning time each temperature range second burning time weight; Then, according to the first parameter, the second parameter, the 3rd parameter, the 4th parameter, first burning time weight and second burning time weight calculation the 5th parameter and the 6th parameter; Wherein, described 5th parameter and the 6th parameter represent catch fire steady combustion characteristic and the burnout characteristic of coal dust respectively; Finally, according to coal dust firing kinematic behavior in described 5th parameter and the 6th parameter detecting boiler furnace.Described 5th parameter and the 6th parameter can be respectively catch fire steady combustion characteristic overall target and burnout characteristic overall target.Described 5th parameter and the 6th calculation method of parameters as follows:
In formula, R
w zbe the 5th parameter, R
j zbe the 6th parameter, p
1for oxygen concentration is to the factor of influence of coal dust firing kinematic behavior index, p
2for temperature is to the factor of influence of coal dust firing kinematic behavior index, p
1+ p
2=1; k
ibe i-th oxygen concentration interval first burning time weight, m is the number in oxygen concentration interval,
k
jfor a jth temperature range second burning time weight, n is the number of burning temperature range,
r
w,ibe first parameter in i-th oxygen concentration interval, R
w,jfor the 3rd parameter of a jth temperature range, R
j,ibe second parameter in i-th oxygen concentration interval, R
j,jfor the 4th parameter of a jth temperature range.
Following table gives the example calculation of the combustion dynamic characteristics aggregative index of A, B two coals, and according to the burning discriminant index of routine, A, B two coal combustion dynamic characteristics closely; Differentiate according to method of the present invention, B coal is easier than A coal catches fire and after-flame, and its reason is that A coal is stronger than the susceptibility of B coal to oxygen amount.
In detection boiler furnace of the present invention, the method for coal dust firing kinematic behavior has the following advantages:
(1) by discrete for the process of coal combustion combustion process turning to some sections little, the combustion process of coal dust under different oxygen concentrations and temperature is embodied;
(2) in conjunction with coal dust firing kinematic behavior and boiler structure characteristic, not only can be used for the burning complexity compared between Coal rank, resolving power is high, and may be used for prediction coal dust combustion efficiency, for boiler coal mixing combustion and combustion control provide basis;
(3) method is simple, can reflect coal-fired combustion characteristics on actual boiler preferably.
Below in conjunction with accompanying drawing, the embodiment of the system of coal dust firing kinematic behavior in detection boiler furnace of the present invention is described.
Fig. 3 be an embodiment detection boiler furnace in the structural representation of system of coal dust firing kinematic behavior.As shown in Figure 3, in detection boiler furnace of the present invention, the system of coal dust firing kinematic behavior can comprise:
Discrete block 10, for being injected to according to the coal dust preset the total burning time and Secondary Air air distribution state of leaving burner hearth from burner nozzle, sliding-model control is carried out to process of coal combustion, obtains several oxygen concentration intervals, several temperature ranges, first burning time in each oxygen concentration interval and the second burning time of each temperature range;
First thermogravimetric analysis module 20, for carrying out thermogravimetric analysis to the combustion process in each oxygen concentration interval, obtains the first parameter and second parameter in each oxygen concentration interval; Wherein, described first Parametric Representation coal dust catching fire in each oxygen concentration interval surely fires characteristic, the burnout characteristic of the second Parametric Representation coal dust in each oxygen concentration interval;
Second thermogravimetric analysis module 30, for carrying out thermogravimetric analysis to the combustion process of each temperature range, obtains the 3rd parameter and the 4th parameter of each temperature range; Wherein, described 3rd Parametric Representation coal dust catching fire in each temperature range surely fires characteristic, the burnout characteristic of the 4th Parametric Representation 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 the second burning time detecting coal dust firing kinematic behavior in boiler furnace.
As shown in Figure 4, discrete block 10 can comprise:
First division unit 101, for the absolute altitude according to burner, is divided into some layers by burner;
Evaluation unit 102, for according to the temperature field in burner stove tank and velocity field distribution, estimates the oxygen concentration of every grate firing burner, temperature and burning time;
Second division unit 103, for the value according to described oxygen concentration and temperature, is divided into several oxygen concentrations interval and several temperature ranges by described oxygen concentration, temperature and burning time;
First computing unit 104, for the second burning time according to the first burning time and each temperature range that calculate each oxygen concentration interval described burning time respectively.
As shown in Figure 5, detection module 40 comprises:
Second computing unit 401, for according to calculate described first burning time each oxygen concentration interval first burning time weight; According to calculate for the second burning time each temperature range second burning time weight;
3rd computing unit 402, for according to the first parameter, the second parameter, the 3rd parameter, the 4th parameter, first burning time weight and second burning time weight calculation the 5th parameter and the 6th parameter; Wherein, described 5th parameter and the 6th parameter represent catch fire steady combustion characteristic and the burnout characteristic of coal dust respectively;
Detecting unit 403, for according to coal dust firing kinematic behavior in described 5th parameter and the 6th parameter detecting boiler furnace.
Wherein, detecting unit 403 can according to following formulae discovery the 5th parameter and the 6th parameter:
In formula, R
w zbe the 5th parameter, R
j zbe the 6th parameter, p
1for oxygen concentration is to the factor of influence of coal dust firing kinematic behavior index, p
2for temperature is to the factor of influence of coal dust firing kinematic behavior index, p
1+ p
2=1; k
ibe i-th oxygen concentration interval first burning time weight, m is the number in oxygen concentration interval,
k
jfor a jth temperature range second burning time weight, n is the number of burning temperature range,
r
w,ibe first parameter in i-th oxygen concentration interval, R
w,jfor the 3rd parameter of a jth temperature range, R
j,ibe second parameter in i-th oxygen concentration interval, R
j,jfor the 4th parameter of a jth temperature range.
In detection boiler furnace of the present invention, the system of coal dust firing kinematic behavior has the following advantages:
(1) by discrete for the process of coal combustion combustion process turning to some sections little, the combustion process of coal dust under different oxygen concentrations and temperature is embodied;
(2) in conjunction with coal dust firing kinematic behavior and boiler structure characteristic, not only can be used for the burning complexity compared between Coal rank, resolving power is high, and may be used for prediction coal dust combustion efficiency, for boiler coal mixing combustion and combustion control provide basis;
(3) system architecture is simple, can reflect coal-fired combustion characteristics on actual boiler preferably.
The method one_to_one corresponding of coal dust firing kinematic behavior in the system of coal dust firing kinematic behavior and detection boiler furnace of the present invention in detection boiler furnace of the present invention, the technical characteristic that the embodiment of the method for coal dust firing kinematic behavior is set forth in above-mentioned detection boiler furnace and beneficial effect thereof are all applicable to, in the embodiment of the system detecting coal dust firing kinematic behavior in boiler furnace, hereby state.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this instructions is recorded.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It 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. detect a method for coal dust firing kinematic behavior in boiler furnace, it is characterized in that, comprise the following steps:
Coal dust according to presetting is injected to the total burning time and Secondary Air air distribution state of leaving burner hearth from burner nozzle, sliding-model control is carried out to process of coal combustion, obtains several oxygen concentration intervals, several temperature ranges, first burning time in each oxygen concentration interval and the second burning time of each temperature range;
Thermogravimetric analysis is carried out to the combustion process in each oxygen concentration interval, obtains the first parameter and second parameter in each oxygen concentration interval; Wherein, described first Parametric Representation coal dust catching fire in each oxygen concentration interval surely fires characteristic, the burnout characteristic of the second Parametric Representation coal dust in each oxygen concentration interval;
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; Wherein, described 3rd Parametric Representation coal dust catching fire in each temperature range surely fires characteristic, the burnout characteristic of the 4th Parametric Representation coal dust in each temperature range;
Coal dust firing kinematic behavior 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.
2. the method for coal dust firing kinematic behavior in detection boiler furnace according to claim 1, it is characterized in that, sliding-model control is carried out to process of coal combustion, obtains several oxygen concentration intervals, several temperature ranges, the step of first burning time in each oxygen concentration interval and the second burning time of each temperature range comprise:
According to the absolute altitude of burner, burner is divided into some layers;
According to the temperature field in burner stove tank and velocity field distribution, estimate the oxygen concentration of every grate firing burner, temperature and burning time;
According to the value of described oxygen concentration and temperature, described oxygen concentration, temperature and burning time are divided into interval and several temperature ranges of several oxygen concentrations;
According to second burning time of the first burning time and each temperature range that calculate each oxygen concentration interval described burning time respectively.
3. the method for coal dust firing kinematic behavior in detection boiler furnace according to claim 1, it is characterized in that, comprise according to the first parameter, the second parameter, the 3rd parameter, the 4th parameter, the first burning time and the step that detects coal dust firing kinematic behavior in boiler furnace the second burning time:
According to calculate described first burning time each oxygen concentration interval first burning time weight; According to calculate for the second burning time each temperature range second burning time weight;
According to the first parameter, the second parameter, the 3rd parameter, the 4th parameter, first burning time weight and second burning time weight calculation the 5th parameter and the 6th parameter; Wherein, described 5th parameter and the 6th parameter represent catch fire steady combustion characteristic and the burnout characteristic of coal dust respectively;
According to coal dust firing kinematic behavior in described 5th parameter and the 6th parameter detecting boiler furnace.
4. the method for coal dust firing kinematic behavior in detection boiler furnace according to claim 3, it is characterized in that, the computing method of described 5th parameter and the 6th parameter are as follows:
In formula, R
w zbe the 5th parameter, R
j zbe the 6th parameter, p
1for oxygen concentration is to the factor of influence of coal dust firing kinematic behavior index, p
2for temperature is to the factor of influence of coal dust firing kinematic behavior index, p
1+ p
2=1; k
ibe i-th oxygen concentration interval first burning time weight, m is the number in oxygen concentration interval,
k
jfor a jth temperature range second burning time weight, n is the number of burning temperature range,
r
w,ibe first parameter in i-th oxygen concentration interval, R
w,jfor the 3rd parameter of a jth temperature range, R
j,ibe second parameter in i-th oxygen concentration interval, R
j,jfor the 4th parameter of a jth temperature range.
5. the method for coal dust firing kinematic behavior in detection boiler furnace according to claim 1, it is characterized in that, carry out thermogravimetric analysis to the combustion process in each oxygen concentration interval, the step of the first parameter and the second parameter that obtain each oxygen concentration interval comprises:
Coal dust weight, coal powder size, Range of measuring temp and heating rate parameter are set;
Determine the measurement atmosphere in each oxygen concentration interval;
According to the coal dust weight arranged, coal powder size, Range of measuring temp and heating rate parameter, thermogravimetric analysis is carried out to the combustion process under each measurement atmosphere, obtains the first parameter under different measurement atmosphere and the second parameter.
6. the method for coal dust firing kinematic behavior in detection boiler furnace according to claim 1, it is characterized in that, carry out thermogravimetric analysis to the combustion process of each temperature range, the step of the 3rd parameter and the 4th parameter that obtain each temperature range comprises:
Coal dust weight, coal powder size, heating rate and measurement atmosphere parameter are set;
According to the coal dust weight arranged, coal powder size, heating rate and measurement atmosphere parameter, thermogravimetric analysis is carried out to the combustion process of each temperature range, obtains the 3rd parameter in different temperatures interval and the 4th parameter.
7. detect a system for coal dust firing kinematic behavior in boiler furnace, it is characterized in that, comprising:
Discrete block, for being injected to according to the coal dust preset the total burning time and Secondary Air air distribution state of leaving burner hearth from burner nozzle, sliding-model control is carried out to process of coal combustion, obtains several oxygen concentration intervals, several temperature ranges, first burning time in each oxygen concentration interval 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 interval, obtains the first parameter and second parameter in each oxygen concentration interval; Wherein, described first Parametric Representation coal dust catching fire in each oxygen concentration interval surely fires characteristic, the burnout characteristic of the second Parametric Representation coal dust in each oxygen concentration interval;
Second thermogravimetric analysis module, for carrying out thermogravimetric analysis to the combustion process of each temperature range, obtains the 3rd parameter and the 4th parameter of each temperature range; Wherein, described 3rd Parametric Representation coal dust catching fire in each temperature range surely fires characteristic, the burnout characteristic of the 4th Parametric Representation 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 burning time detecting coal dust firing kinematic behavior in boiler furnace.
8. the system of coal dust firing kinematic behavior in detection boiler furnace according to claim 7, it is characterized in that, described discrete block comprises:
First division unit, for the absolute altitude according to burner, is divided into some layers by burner;
Evaluation unit, for according to the temperature field in burner stove tank and velocity field distribution, estimates the oxygen concentration of every grate firing burner, temperature and burning time;
Second division unit, for the value according to described oxygen concentration and temperature, is divided into several oxygen concentrations interval and several temperature ranges by described oxygen concentration, temperature and burning time;
First computing unit, for the second burning time according to the first burning time and each temperature range that calculate each oxygen concentration interval described burning time respectively.
9. the system of coal dust firing kinematic behavior in detection boiler furnace according to claim 7, it is characterized in that, described detection module comprises:
Second computing unit, for according to calculate described first burning time each oxygen concentration interval first burning time weight; According to calculate for the second burning time each temperature range second burning time weight;
3rd computing unit, for according to the first parameter, the second parameter, the 3rd parameter, the 4th parameter, first burning time weight and second burning time weight calculation the 5th parameter and the 6th parameter; Wherein, described 5th parameter and the 6th parameter represent catch fire steady combustion characteristic and the burnout characteristic of coal dust respectively;
Detecting unit, for according to coal dust firing kinematic behavior in described 5th parameter and the 6th parameter detecting boiler furnace.
10. the system of coal dust firing kinematic behavior in detection boiler furnace according to claim 9, it is characterized in that, described detecting unit is according to following formulae discovery the 5th parameter and the 6th parameter:
In formula, R
w zbe the 5th parameter, R
j zbe the 6th parameter, p
1for oxygen concentration is to the factor of influence of coal dust firing kinematic behavior index, p
2for temperature is to the factor of influence of coal dust firing kinematic behavior index, p
1+ p
2=1; k
ibe i-th oxygen concentration interval first burning time weight, m is the number in oxygen concentration interval,
k
jfor a jth temperature range second burning time weight, n is the number of burning temperature range,
r
w,ibe first parameter in i-th oxygen concentration interval, R
w,jfor the 3rd parameter of a jth temperature range, R
j,ibe second parameter in i-th oxygen concentration interval, R
j,jfor the 4th parameter of a jth temperature range.
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