CN106765031B - A kind of furnace of power-plant boilers slagging Multi sectional method of real-time - Google Patents
A kind of furnace of power-plant boilers slagging Multi sectional method of real-time Download PDFInfo
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- CN106765031B CN106765031B CN201710049520.5A CN201710049520A CN106765031B CN 106765031 B CN106765031 B CN 106765031B CN 201710049520 A CN201710049520 A CN 201710049520A CN 106765031 B CN106765031 B CN 106765031B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
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Abstract
The invention discloses a kind of furnace of power-plant boilers slagging Multi sectional method of real-time, by increasing heat-flow meter measuring point in burner hearth and acquiring boiler real time execution parameter, as-fired coal prime number evidence and boiler furnace structure and design parameter, step is calculated according to established slagging Multi sectional, it calculates the real-time slagging situation of the multiple sections of flake hearth-tapping, carries out sectional soot blowing for operations staff and reference is provided.
Description
Technical field
The present invention relates to a kind of furnace of power-plant boilers slagging Multi sectional method of real-time, especially a kind of to be increased by system
The existing operation measuring point of the measuring point and boiler added carries out data acquisition, is tied according to established calculating step in advance is carried out
Slag pollution calculates, to obtain the monitoring method of real-time slagging situation in burner hearth.
Background technique
The method of operation in station boiler using the fossil fuels such as coal as energy source determines it in the process of running not
Avoidable ground can generate ash fouling, and the burner hearth as boiler primary combustion space, due to its internal flame extreme temperatures, usually
It has been more than the ash fusion point of coal ash, the flying dust for resulting in molten condition, which is easily adhered on the lower water-cooling wall of temperature, forms extremely difficult go
The slag blanket removed, influences the heat transfer property of boiler, and it is excessively high to be likely to result in water cooling wall temperature when serious, causes booster blowing out etc. serious
Accident.
The problems such as washing away due to the extreme temperatures in burner hearth and there are the flying dust in flue gas, therefore cannot use measured directly
Mode is monitored, thus rests on conceptual phase always for the slagging real-time monitoring of burner hearth at this stage.Usual station boiler
The problem of generalling use the removing work of soot-blowing mode progress Boiler Furnace slagging at regular time and quantity, but being a lack of intuitive monitoring data
Will lead to soot blowing slagging soot blowing not in time and heat transfer efficiency decline or soot blowing excessively frequently and waste of steam is too many.
There is the slagging situation proposed by way of acoustics or laser temperature-measuring inside indirect monitoring burner hearth in existing document,
But since the not convenient for safeguarding therefore application that involves great expense of monitoring instrument is less.What is relatively mostly used at present is all flexible measurement method,
Such method calculates slagging situation by acquisition burner hearth real-time running data, according to established computation model, but due to pot
Furnace operating condition is changeable, and heat-transfer mechanism is complicated in burner hearth, therefore the accuracy of hard measurement monitoring method needs more practice and tests
Card.In addition to this, due to the increase of boiler capacity, furnace cavity become larger and the multiple spot of soot blower arrangement, traditional burner hearth knot
Slag whole monitoring cannot embody the slagging situations of different sections due to that can only react burner hearth entirety slagging situation, can not expire
Sufficient power plant carries out the demand of sectional soot blowing to boiler furnace, and application prospect is restricted.It can be right so developing one kind
Burner hearth carries out Multi sectional monitoring and the accurate method of result, it appears great meaning.
Summary of the invention
Goal of the invention: in view of the deficienciess of the prior art, to provide a kind of furnace of power-plant boilers Multi sectional real-time by the present invention
Monitoring method is arranged that heat-flow meter measures burner hearth local heat flux density by sections multiple on furnace wall cooling, and is acquired real-time
Then it is more to calculate flake hearth-tapping according to the collected data for operating parameter, as-fired coal prime number evidence and boiler furnace structure and design parameter
The real-time slagging degree of section.This monitoring method realizes the advantageous combination of apparatus measures and theoretical calculation, can be operation people
Member carries out the operation of burner hearth sectional soot blowing and provides the visual data reference of the real-time slagging situation of Multi sectional in furnace.
Technical solution: to achieve the goals above, the present invention is using the water-cooling wall thermal effective coefficient of each section as reflection
Boiler Furnace slagging degree slagging monitoring index shows that more greatly the stronger slagging of water wall absorption radianting capacity is less, smaller to show
The poorer slagging of water wall absorption radianting capacity is more serious, and method mainly comprises the steps that
Step 1: burner hearth is divided into three regions main burning area A, burning-out zone B and heat transfer zone C according to the difference of ignition quality
Three regions, wherein main burning area A is divided into a sections according to the burner number of plies, and burning-out zone B is divided into b sections according to the burnout degree number of plies, heat exchange
Area C is divided into c sections according to the soot blower number of plies in this region, and such as attached drawing 2, a refers to that the burner number of plies, b refer to that the burnout degree number of plies, c refer to herein
The number of plies of heat transfer zone soot blower.
Step 2: pass through in burner hearth arrange heat-flow meter measuring point and acquire boiler real time execution parameter, as-fired coal prime number evidence and
Boiler furnace structure and design parameter.
Step 3: calculating fuel theoretical temperature combustion Tth, the comprehensive blackness ε of burner hearth entirety flamesyn, burner hearth integral water-cooled wall heat
Coefficient of efficiency ψfWith burner hearth entirety blacknessIt prepares for the calculating of burner hearth sectional radiant heat transfer.
Step 4: according to the heat-flow meter measuring point and slagging calculation method of main burning area A arrangement, calculating a of primary combustion zone A
A section slagging degree ψA1~ψAa。
Step 5: according to the heat-flow meter measuring point and slagging calculation method of burning-out zone B arrangement, calculating the b area of after-flame region B
Section slagging degree ψB1~ψBb。
Step 6: according to the heat-flow meter measuring point and slagging calculation method of heat transfer zone C arrangement, calculating the c area of heat exchange area C
Section slagging degree ψC1~ψCc。
Step 7: the calculated each real-time water-cooling wall thermal effective coefficient of section of output reflects the parameter of slagging degree: ψA1
~ψAa, ψB1~ψBb, ψC1~ψCcIt is distributed in time and is made into curve graph, be presented to fortune as the intuitive slagging monitoring data of each section
Administrative staff.
Boiler real time execution parameter in the step 2 includes that measuring point and the station boiler itself that this method separately adds are arranged
Measuring point, separately plus measuring point be mainly the heat-flow meter arranged on the multiple sections of burner hearth, for measuring the local heat flux of different sections
Density is shown in that attached drawing 2, the measuring point that boiler itself is arranged mainly have boiler fired coal amount, oxygen at furnace exit, First air to account for total blast volume ratio
Example, Secondary Air account for total blast volume ratio, First air inlet and outlet wind-warm syndrome, Secondary Air inlet and outlet wind-warm syndrome, flue gas temperature of hearth outlet etc., can
Real time data is acquired by Power Plant DCS System；As-fired coal prime number is obtained according to by coal analysis, the main element including coal point
Analysis, Industrial Analysis and calorimetry etc. also need the proportion of different coal samples if burning coal sample is to blend coal；It chamber structure and sets
Counting parameter can be obtained by boiler using with design instruction, need the heat-transfer area of burner hearth entirety heat transfer area, different sections
Product, dischargeable capacity, computed altitude, up and down row's burner arrangement difference in height, burner averagely arrange height, outlet smokestack area,
The air leakage coefficient of burner hearth air leakage coefficient, pulverized coal preparation system.
Fuel theoretical temperature combustion T is calculated in the step 3th, the comprehensive blackness ε of burner hearth entirety flamesyn, burner hearth entirety water
Cold wall thermal effective coefficient ψfWith burner hearth entirety blacknessMethod following (flue gas and air enthalpy temperature table being related to pass through coal quality combustion
Material, which calculates, to be obtained, this is thermodynamic computing common sense, is repeated no more):
(1) fuel theoretical temperature combustion T is calculatedth:
A. enter furnace air heat with unit mass fuelEnthalpy herein takes all in accordance with temperature according to air enthalpy Wen Biaocha；
B. unit mass fuel brings efficient heat in furnace intoEfficient heat in furnaceAs theoretical temperature combustion TthCorresponding enthalpy, is obtainingIt is looked into afterwards by flue gas enthalpy temperature table using interpolation method and takes Tth。
(2) the comprehensive blackness ε of furnace flame is calculatedsyn:
A. the practical flame blackness of burner hearth
B. the comprehensive blackness of furnace flame
(3) the integral water-cooled wall thermal effective coefficient ψ of burner hearth is calculatedfWith burner hearth entirety blackness
A. the integral water-cooled wall thermal effective coefficient of burner hearthIn formula
Facilitate institute's setting parameter, no practical significance to solve；
B. burner hearth entirety blackness
Wherein,For theoretical cold air enthalpy, i.e. air preheater import First air and the corresponding enthalpy of Secondary Air mixing temperature,
kJ/kg；For theoretical hot-air enthalpy, i.e. air preheater outlet First air and the corresponding enthalpy of Secondary Air mixing temperature, kJ/kg；
QkFor the heat for the air (containing leaking out) brought into furnace with unit mass fuel, kJ/kg；QrIt is brought into furnace for unit quality fuels
Heat, generally equal to fuel net calorific value as received basis, kJ/kg；q3For the imperfect combustion heat loss of chemistry, %；q4For machinery
Imperfect combustion heat loss, %；q6For other heat loss, %；αfIt " is furnace outlet excess air coefficient；ΔαfIt leaks out for burner hearth
Coefficient；ΔαpcsFor the air leakage coefficient of pulverized coal preparation system；Effective heat in furnace, kJ/kg are brought into for unit quality fuels；TthFor reason
By ignition temperature, K；kaFor radiation absorption attenuation coefficient, m-1(coal quality fuel, which calculates, to be obtained, this is thermodynamic computing common sense, no longer superfluous
It states)；εfFor the practical flame blackness of burner hearth；εsynIt is black to consider the flame synthesis that Fire Radiation intensity weakens by Absorption of Medium
Degree；S is radiating layer effective thickness in furnace, m；R be and the circular radius of section of burner hearth homalographic, m；For burner hearth entirety blackness；
Tf" smoke temperature, K are integrally exported for burner hearth；ψfFor the integral water-cooled wall thermal effective coefficient of burner hearth；xmFor furnace flame maximum temperature position
Relative altitude, approximation takes relative altitude equal to burner arrangement；σ0For Boltzmann constant, 5.67 × 10 are usually taken- 11kW/(m2·K4)；BjTo calculate quantity combusted, kg/s；For errors；HfFor the heat absorbent surface product of water-cooling wall, m2；For
Mean heat capacity of the inner flue gas of the stove in theoretical temperature combustion to furnace exit temperature section, kJ/ (kgK).
The method that a section slagging degree of primary combustion zone A is calculated in the step 4 is as follows:
(1) the water-cooling wall thermal effective coefficient ψ of the 1st floor burner of primary zone (area A paragraph 1) is calculatedA1:
A. assume the exit gas temperature T of the 1st section of primary zoneA1", according to the equation of heat balance of this sectionCalculate water-cooling wall thermal effective coefficient ψA1；
B. the local heat flux density q obtained according to this section of arrangement heat-flow meter measurementA1, according to the formula of checkCheck the exit gas temperature T for the area the A paragraph 1 assumedA1", if meeting check formula
Export ψA1；T is assumed again if not meeting check formulaA1", checked until meeting again.
(2) the i-th floor of primary zone burner (i-th section of the area A, the water-cooling wall thermal effective coefficient ψ of 1 < i≤a) are calculatedAi:
A. assume the exit gas temperature T of the i-th section of primary zoneAi", according to the equation of heat balance of this section Calculate water-cooling wall thermal effective coefficient ψAi, herein
B. the local heat flux density q obtained according to this section of arrangement heat-flow meter measurementAi, according to the formula of checkCheck the exit gas temperature T for assuming i-th section of the area AAi", exported if meeting check formula
ψAi；T is assumed again if not meeting check formulaAi", checked until meeting again.
Wherein, subscript Ai represents the i-th section of primary zone A, a certain section of the area A that i representation module currently calculates, and i-1 is indicated
The previous section of the current calculation of sector of module, 1 < i≤a, since the heat transfer model of the 1st section is different therefore independent column in this step
Out, symbolic interpretation is identical as the i-th section；The n occurred in formula is used as in algebra sum formula and refers to function, without practical meaning
Justice；BjiFor i-th section of the area A calculating quantity combusted, kg/s, it is believed thatQ6For other whole heat loss of burner hearth, kJ/kg can root
It is chosen according to boiler design book according to design value；TAiIt " is i-th section of the area A exit gas temperature, K；IAiIt " is i-th section of the area A exiting flue gas
Enthalpy, kJ/kg, according to TAiIt " looks into and flue gas enthalpy temperature table is taken to obtain；TAiFor i-th section of the flue gas mean temperature in the area A, K；βcrFor fuel
Burn-off rate can consult boiler handbook；ψ " is lower curtate to the radiation thermal effective coefficient of upper curtate, generally takes 0.1；FAiFor the area A i-th
Section outlet furnace cross-sectional area, m2；HAiFor i-th section of the water-cooling wall heat transfer area in the area A, m2；ψAiEffectively for i-th section of the area A water-cooling wall heat
Coefficient；qAiFor the local heat flux density in i-th section of the area A that heat-flow meter measures, kW/m2。
The method that the b section slagging degree of burning-out zone domain B is calculated in the step 5 is as follows:
(1) the water-cooling wall thermal effective coefficient ψ of the 1st floor burnout degree of burning-out zone (area B paragraph 1) is calculatedB1:
A. assume the exit gas temperature T of the 1st section of burning-out zoneB1", according to the equation of heat balance of this sectionCalculate water-cooling wall thermal effective coefficient ψB1, herein
B. the local heat flux density q obtained according to this section of arrangement heat-flow meter measurementB1, according to the formula of checkCheck the exit gas temperature T for assuming the area B paragraph 1B1", exported if meeting check formula
ψB1；T is assumed again if not meeting check formulaB1", checked until meeting again.
(2) the water-cooling wall thermal effective coefficient ψ of burning-out zone kth floor burnout degree (area B kth section, 1 < k≤b) is calculatedBk:
A. assume the exit gas temperature T of burning-out zone kth sectionBk", according to the equation of heat balance of this sectionCalculate water-cooling wall thermal effective coefficient ψBk, herein
B. the local heat flux density q obtained according to this section of arrangement heat-flow meter measurementBk, according to the formula of checkCheck the exit gas temperature T for assuming the area B kth sectionBk", exported if meeting check formula
ψBk；T is assumed again if not meeting check formulaBk", checked until meeting again.
Wherein, subscript Bk represents the kth section of burning-out zone B, a certain section of the area B that k representation module currently calculates, and k-1 is indicated
The previous section of the current calculation of sector of module, 1 < k≤b, since the heat transfer model of the 1st section is different therefore independent column in this step
Out, symbolic interpretation is identical as kth section；ΔβcrFor the uncombusted rate of main combustion zone fuel；TBkIt " is the area B kth section exiting flue gas
Temperature, K；IBkIt " is the area B kth section exiting flue gas enthalpy, kJ/kg, according to TBkIt " looks into and flue gas enthalpy temperature table is taken to obtain；TBkFor the area B kth
The flue gas mean temperature of section, K；ψ " is lower curtate to the radiation thermal effective coefficient of upper curtate, generally takes 0.1；FBkFor the area B kth section
Export furnace cross-sectional area, m2；HBkFor the water-cooling wall heat transfer area of the area B kth section, m2；ψBkFor the area B kth section water-cooling wall heat effectively system
Number；qBkFor the local heat flux density for the area the B kth section that heat-flow meter measures, kW/m2。
The method that the c section slagging degree of heat exchange area C is calculated in the step 6 is as follows:
Calculate the water-cooling wall thermal effective coefficient ψ of heat transfer zone m floor soot blower (m sections of the area C, 1≤m≤c)Cm:
A. assume the exit gas temperature T of heat transfer zone m sectionCm", according to the equation of heat balance of this sectionCalculate water-cooling wall thermal effective coefficient ψCm.Herein as m=1, under
Mark C (m-1) is equivalent to Bb i.e. b layers of burnout degree of burning-out zone the last layer,And as m > 1,
B. the local heat flux density q obtained according to this section of arrangement heat-flow meter measurementCm, according to the formula of checkCheck the exit gas temperature T for assuming m sections of the area CCm", exported if meeting check formula
ψCm；T is assumed again if not meeting check formulaCm", checked until meeting again.
Wherein, subscript Cm represents the m section of burning-out zone C, a certain section of the area C that m representation module currently calculates, and m-1 is indicated
The previous section of the current calculation of sector of module, 1≤m≤c；TCmIt " is m sections of the area C exit gas temperature, K；ICmIt " is m sections of the area C
Exiting flue gas enthalpy, kJ/kg, according to TCmIt " looks into and flue gas enthalpy temperature table is taken to obtain；TCmFor m sections of the flue gas mean temperature in the area C, K；ψ"
It is lower curtate to the radiation thermal effective coefficient of upper curtate, generally takes 0.1；FCmFor m sections of the area C outlet furnace cross-sectional area, m2；HCmFor
The water-cooling wall heat transfer area in m sections of the area C, m2；ψCmFor m sections of the area C water-cooling wall thermal effective coefficient；qCmThe area C measured for heat-flow meter
M sections of local heat flux density, kW/m2。
The utility model has the advantages that a kind of furnace of power-plant boilers Multi sectional real-time monitoring system of the present invention is compared with prior art, have with
Down the utility model has the advantages that the 1, present invention is capable of providing the visual data of the real-time slagging situation of burner hearth difference section, blown for burner hearth sectional
Ash manipulation provides reference；2, the present invention is capable of providing in burner hearth the flue-gas temperature distribution of different sections, for hearth combustion adjustment and
Optimization provides data foundation；3, the mode that burner hearth divides section can arbitrarily change according to the demand that power plant runs, and can be applicable in
In the station boiler of different types of structure, the scope of application is wider.
Detailed description of the invention
Fig. 1 is calculating flow chart of steps of the invention
Fig. 2 is burner hearth section partition of the present invention.
Specific embodiment
Next combined with specific embodiments below the present invention is furture elucidated, it should be understood that example is merely to illustrate the present invention and does not have to
In limiting the scope of the invention, after the present invention has been read, those skilled in the art are to various equivalent forms of the invention
Modification falls within the application range as defined in the appended claims.
The boiler of example description selection is certain 600MW supercritical parameter variable-pressure operation direct current cooker, boiler model
HG1913/25.4-YM4 type, single burner hearth, helical water-cooled wall, single reheat, balanced draft, outdoor arrangement, dry ash extraction, all steel
Framework, full overhung construction Π type boiler.Boiler combustion mode is opposed firing burning, and front-back wall respectively arranges 3 layer of three well bar cloth
The low NO of Cork company productionXAxial rotational flow burner (LNASB), above top layer's coal burner, front-back wall respectively arranges 1
Layer after-flame air port.
Using the water-cooling wall thermal effective coefficient of each section as reflection Boiler Furnace slagging degree slagging monitoring index, bigger table
The bright stronger slagging of water wall absorption radianting capacity is less, smaller to show that the poorer slagging of water wall absorption radianting capacity is more serious,
Method mainly comprises the steps that
Step 1: burner hearth part is divided by three regions main burning area A, after-flame according to the section partition method in specification
Area B and the heat transfer zone three regions C, wherein main burning area A is divided into 3 sections according to the burner number of plies, and burning-out zone B is according to the burnout degree number of plies
It is divided into 1 section, heat transfer zone C is divided into 3 sections according to the soot blower number of plies in this region.
Step 2: main acquisition boiler real time execution parameter, as-fired coal prime number evidence and boiler furnace structure and design parameter.
Wherein, boiler real time execution parameter includes the measuring point that measuring point and station boiler itself that this system separately adds is arranged, separately plus measuring point
The heat-flow meter mainly arranged on the multiple sections of burner hearth is used to measure the local heat flux density of different sections, and boiler itself is arranged
Measuring point mainly there is boiler fired coal amount, oxygen at furnace exit, First air to account for total blast volume ratio, Secondary Air accounts for total blast volume ratio, one
Secondary wind inlet and outlet wind-warm syndrome, Secondary Air import and export wind-warm syndrome, flue gas temperature of hearth outlet (if can calculate along inverse flue gas flow without measuring point)
Deng real time data can be acquired by Power Plant DCS System；As-fired coal prime number is obtained according to by coal analysis, and main includes the member of coal
Element analysis, Industrial Analysis and calorimetry etc. also need the proportion of different coal samples if burning coal sample is to blend coal；Chamber structure
And design parameter can be used by boiler and design instruction obtains, and needs the biography of burner hearth entirety heat transfer area, different sections
Heat area, dischargeable capacity, computed altitude, row's burner arrangement difference in height, burner averagely arrange height, outlet smokestack face up and down
The air leakage coefficient of product, burner hearth air leakage coefficient, pulverized coal preparation system.
Step 3: calculating fuel theoretical temperature combustion Tth, the comprehensive blackness ε of burner hearth entirety flamesyn, burner hearth integral water-cooled wall heat
Coefficient of efficiency ψfWith burner hearth entirety blackness(the flue gas and air enthalpy being related to of preparing is calculated for burner hearth sectional radiant heat transfer
Warm table is calculated by coal quality fuel and is obtained, this is thermodynamic computing common sense, is repeated no more)
(1) fuel theoretical temperature combustion T is calculatedth:
A. enter furnace air heat(enthalpy herein is equal
It is taken according to temperature according to air enthalpy Wen Biaocha)；
B. fuel brings efficient heat in furnace intoEfficient heat in furnaceAs manage
By ignition temperature TthCorresponding enthalpy, is obtainingIt is looked into afterwards by flue gas enthalpy temperature table using interpolation method and takes Tth。
(2) the comprehensive blackness ε of furnace flame is calculatedsyn:
A. the practical flame blackness of burner hearth
B. the comprehensive blackness of furnace flame
(3) the integral water-cooled wall thermal effective coefficient ψ of burner hearth is calculatedfWith burner hearth entirety blackness
A. the integral water-cooled wall thermal effective coefficient of burner hearth(in formulaFacilitate institute's setting parameter, no practical significance to solve)；
B. burner hearth entirety blackness
Step 4: according to the slagging computation model of main burning area A and the heat-flow meter measuring point of arrangement, calculating primary combustion zone a
The slagging degree of section:
(1) the water-cooling wall thermal effective coefficient ψ of the 1st floor burner of primary zone (area A paragraph 1) is calculatedA1:
A. assume the exit gas temperature T of the 1st section of primary zoneA1", according to the equation of heat balance of this sectionCalculate water-cooling wall thermal effective coefficient ψA1；
B. the local heat flux density q obtained according to this section of arrangement heat-flow meter measurementA1, according to the formula of checkCheck the exit gas temperature T for the area the A paragraph 1 assumedA1", if meeting check formula
Export ψA1；T is assumed again if not meeting check formulaA1", checked until meeting again.
(2) the water-cooling wall thermal effective coefficient ψ in the 2nd floor burner of primary zone (the 2nd section of the area A) is calculatedA2:
A. assume the exit gas temperature T of the 2nd section of primary zoneA2", according to the equation of heat balance of this section Calculate water-cooling wall thermal effective coefficient ψA2, herein
B. the local heat flux density q obtained according to this section of arrangement heat-flow meter measurementA2, according to the formula of checkCheck the exit gas temperature T for assuming the 2nd section of the area AA2", exported if meeting check formula
ψA2；T is assumed again if not meeting check formulaA2", checked until meeting again.
(3) the water-cooling wall thermal effective coefficient ψ in the 3rd floor burner of primary zone (the 3rd section of the area A) is calculatedA3:
A. assume the exit gas temperature T of the 3rd section of primary zoneA3", according to the equation of heat balance of this section Calculate water-cooling wall thermal effective coefficient ψA3, herein
B. the local heat flux density q obtained according to this section of arrangement heat-flow meter measurementA3, according to the formula of checkCheck the exit gas temperature T for assuming the 3rd section of the area AA3", exported if meeting check formula
ψA3；T is assumed again if not meeting check formulaA3", checked until meeting again.
Step 5: according to the slagging computation model of burning-out zone B and the heat-flow meter measuring point of arrangement, calculating 1, after-flame region section
Slagging degree:
Calculate the water-cooling wall thermal effective coefficient ψ of the 1st floor burnout degree of burning-out zone (area B paragraph 1)B1:
A. assume the exit gas temperature T of the 1st section of burning-out zoneB1", according to the equation of heat balance of this sectionCalculate water-cooling wall thermal effective coefficient ψB1, herein
B. the local heat flux density q obtained according to this section of arrangement heat-flow meter measurementB1, according to the formula of checkCheck the exit gas temperature T for assuming the area B paragraph 1B1", exported if meeting check formula
ψB1；T is assumed again if not meeting check formulaB1", checked until meeting again.
Step 6: according to the slagging computation model of heat transfer zone C and the heat-flow meter measuring point of arrangement, calculating the section of heat exchange area 3
Slagging degree, i.e.,
(1) the water-cooling wall thermal effective coefficient ψ of the 1st floor soot blower of heat transfer zone (area C paragraph 1) is calculatedC1:
A. assume the exit gas temperature T of the 1st section of heat transfer zoneC1", according to the equation of heat balance of this section
Calculate water-cooling wall heat
Coefficient of efficiency ψC1,
B. the local heat flux density q obtained according to this section of arrangement heat-flow meter measurementC1, according to the formula of checkCheck the exit gas temperature T for assuming the area C paragraph 1C1", exported if meeting check formula
ψC1；T is assumed again if not meeting check formulaC1", checked until meeting again.
(2) the water-cooling wall thermal effective coefficient ψ in the 2nd floor soot blower of heat transfer zone (the 2nd section of the area C) is calculatedC2:
A. assume the exit gas temperature T of the 2nd section of heat transfer zoneC2", according to the equation of heat balance of this sectionCalculate water-cooling wall thermal effective coefficient ψC2,
B. the local heat flux density q obtained according to this section of arrangement heat-flow meter measurementC2, according to the formula of checkCheck the exit gas temperature T for assuming the 2nd section of the area CC2", exported if meeting check formula
ψC2；T is assumed again if not meeting check formulaC2", checked until meeting again.
(3) the water-cooling wall thermal effective coefficient ψ in the 3rd floor soot blower of heat transfer zone (the 3rd section of the area C) is calculatedC3:
A. assume the exit gas temperature T of the 3rd section of heat transfer zoneC3", according to the equation of heat balance of this sectionCalculate water-cooling wall thermal effective coefficient ψC3,
B. the local heat flux density q obtained according to this section of arrangement heat-flow meter measurementC3, according to the formula of checkCheck the exit gas temperature T for assuming the 3rd section of the area CC3", exported if meeting check formula
ψC3；T is assumed again if not meeting check formulaC3", checked until meeting again.
Step 7: the calculated each real-time water-cooling wall thermal effective coefficient of section of output: ψA1~ψA3, ψB1, ψC1~ψC3, on time
Between distribution be made into curve graph, be presented to operations staff as the intuitive slagging monitoring data of each section.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of furnace of power-plant boilers slagging Multi sectional method of real-time, it is characterised in that: comprising steps of
Step 1: burner hearth being divided into three regions main burning area A, burning-out zone B according to the difference of ignition quality and heat transfer zone C tri- is big
Region, wherein main burning area A is divided into a section according to the burner number of plies, and burning-out zone B is divided into b section according to the burnout degree number of plies,
Heat transfer zone C is divided into c section according to the soot blower number of plies in this region, and a refers to that the burner number of plies, b refer to that the burnout degree number of plies, c refer to herein
The number of plies of heat transfer zone soot blower；
Step 2: acquisition boiler real time execution parameter, as-fired coal prime number evidence and boiler furnace structure and design parameter；Described three
Each section in big region arranges that heat-flow meter measuring point, the heat-flow meter measuring point measure the local heat flux density of its place section；
Step 3: calculating fuel theoretical temperature combustion Tth, the comprehensive blackness ε of burner hearth entirety flamesyn, burner hearth integral water-cooled wall heat effectively
Coefficient ψfWith burner hearth entirety blackness
Step 4: the data that the data and step 3 acquired according to step 2 are calculated calculate three regions in furnace of power-plant boilers
The real-time slagging degree of each section；The parameter for reflecting slagging degree is the water-cooling wall thermal effective coefficient of each section；
Step 5: each section slagging degree in the calculated three regions of step 4 being distributed in time and is made into curve graph, as each area
The intuitive slagging monitoring data of section.
2. a kind of furnace of power-plant boilers slagging Multi sectional method of real-time according to claim 1, it is characterised in that:
Boiler real time execution parameter in the step 2 includes the measuring point that heat-flow meter measuring point and station boiler itself are arranged, boiler itself
The data of the measuring point measurement of arrangement include boiler fired coal amount, oxygen at furnace exit, that First air accounts for total blast volume ratio, Secondary Air Zhan is total
Air quantity ratio, First air inlet and outlet wind-warm syndrome, Secondary Air import and export wind-warm syndrome, flue gas temperature of hearth outlet, are adopted by Power Plant DCS System
Collect real time data；As-fired coal prime number is obtained according to by coal analysis, elemental analysis, Industrial Analysis and calorimetry including coal；
Chamber structure and design parameter are used by boiler and design instruction obtains, including burner hearth entirety heat transfer area, different sections
Heat transfer area, dischargeable capacity, computed altitude, row's burner arrangement difference in height, burner averagely arranges height, outlet cigarette up and down
Window ara, burner hearth air leakage coefficient, pulverized coal preparation system air leakage coefficient.
3. a kind of furnace of power-plant boilers slagging Multi sectional method of real-time according to claim 1, it is characterised in that:
Fuel theoretical temperature combustion T is calculated in the step 3th, the comprehensive blackness ε of burner hearth entirety flamesyn, the integral water-cooled wall heat of burner hearth has
Imitate coefficient ψfWith burner hearth entirety blacknessMethod it is as follows:
(1) fuel theoretical temperature combustion T is calculatedth:
A. enter furnace air heat with unit mass fuelHerein
Enthalpy taken all in accordance with temperature according to air enthalpy Wen Biaocha；
B. unit mass fuel brings efficient heat in furnace intoEfficient heat in furnaceI.e.
For theoretical temperature combustion TthCorresponding enthalpy, is obtainingIt is looked into afterwards by flue gas enthalpy temperature table using interpolation method and takes Tth；
(2) the comprehensive blackness ε of furnace flame is calculatedsyn:
A. the practical flame blackness of burner hearth
B. the comprehensive blackness of furnace flame
(3) the integral water-cooled wall thermal effective coefficient ψ of burner hearth is calculatedfWith burner hearth entirety blackness
A. the integral water-cooled wall thermal effective coefficient of burner hearthIn formulaFor
Solution facilitates institute's setting parameter, no practical significance；
B. burner hearth entirety blackness
Wherein,For theoretical cold air enthalpy, i.e. air preheater import First air and the corresponding enthalpy of Secondary Air mixing temperature, kJ/
kg；For theoretical hot-air enthalpy, i.e. air preheater outlet First air and the corresponding enthalpy of Secondary Air mixing temperature, kJ/kg；QkFor
Bring the heat of the air in furnace, kJ/kg into unit mass fuel；QrThe heat in furnace, kJ/ are brought into for unit quality fuels
kg；q3For the imperfect combustion heat loss of chemistry, %；q4For Mechanical adsorption, %；q6For other heat loss, %；
αfIt " is furnace outlet excess air coefficient；ΔαfFor burner hearth air leakage coefficient；ΔαpcsFor the air leakage coefficient of pulverized coal preparation system；For list
Position quality fuels bring effective heat in furnace, kJ/kg into；TthFor theoretical temperature combustion, K；kaFor radiation absorption attenuation coefficient, m-1；
εfFor the practical flame blackness of burner hearth；εsynTo consider the comprehensive blackness of flame that Fire Radiation intensity weakens by Absorption of Medium；S
For radiating layer effective thickness, m in furnace；R be and the circular radius of section of burner hearth homalographic, m；For burner hearth entirety blackness；Tf" it is
Burner hearth integrally exports smoke temperature, K；ψfFor the integral water-cooled wall thermal effective coefficient of burner hearth；xmFor the opposite of furnace flame maximum temperature position
Highly；σ0For Boltzmann constant；BjTo calculate quantity combusted, kg/s；For errors；HfIt is long-pending for the heat absorbent surface of water-cooling wall,
m2；For mean heat capacity of the inner flue gas of the stove in theoretical temperature combustion to furnace exit temperature section, kJ/ (kgK).
4. a kind of furnace of power-plant boilers slagging Multi sectional method of real-time according to claim 1, it is characterised in that:
The method that a section slagging degree of primary combustion zone A is calculated in the step 4 is as follows:
(1) the water-cooling wall thermal effective coefficient ψ of the 1st layer of primary zone burner is calculatedA1:
A. assume the exit gas temperature T of the 1st section of primary zoneA1", according to the equation of heat balance of this section Calculating water-cooling wall heat has
Imitate coefficient ψA1；
B. the local heat flux density q obtained according to this section of arrangement heat-flow meter measurementA1, according to the formula of checkCheck the exit gas temperature T for the area the A paragraph 1 assumedA1", if meeting check formula
Export ψA1；T is assumed again if not meeting check formulaA1", checked until meeting again；
(2) the water-cooling wall thermal effective coefficient ψ of i-th layer of primary zone burner is calculatedAi:
A. assume the exit gas temperature T of the i-th section of primary zoneAi", according to the equation of heat balance of this section Calculate water-cooling wall thermal effective coefficient ψAi, herein
B. the local heat flux density q obtained according to this section of arrangement heat-flow meter measurementAi, according to the formula of checkCheck the exit gas temperature T for assuming i-th section of the area AAi", exported if meeting check formula
ψAi；T is assumed again if not meeting check formulaAi", checked until meeting again；
Wherein, subscript Ai represents the i-th section of primary zone A, a certain section of the area A that i representation module currently calculates, i-1 representation module
The previous section of current calculation of sector, 1 < i≤a；N is used as in algebra sum formula and refers to function, no practical significance；BjiFor A
I-th section of area calculating quantity combusted, kg/s,Q6For other whole heat loss of burner hearth, kJ/kg is pressed according to boiler design book
It is chosen according to design value；TAiIt " is i-th section of the area A exit gas temperature, K；IAiIt " is i-th section of the area A exiting flue gas enthalpy, kJ/kg, root
According to TAiIt " looks into and flue gas enthalpy temperature table is taken to obtain；TAiFor i-th section of the flue gas mean temperature in the area A, K；βcrFor the burn-off rate of fuel, pot is consulted
Furnace handbook obtains；ψ " is lower curtate to the radiation thermal effective coefficient of upper curtate, takes 0.1；FAiFor i-th section of the area A outlet section of burner hearth
Product, m2；HAiFor i-th section of the water-cooling wall heat transfer area in the area A, m2；ψAiFor i-th section of the area A water-cooling wall thermal effective coefficient；qAiFor heat-flow meter
The local heat flux density in i-th section of the area A measured, kW/m2。
5. a kind of furnace of power-plant boilers slagging Multi sectional method of real-time according to claim 1, it is characterised in that:
The method that the b section slagging degree of burning-out zone domain B is calculated in the step 4 is as follows:
(1) the water-cooling wall thermal effective coefficient ψ of the 1st layer of burnout degree of burning-out zone is calculatedB1:
A. assume the exit gas temperature T of the 1st section of burning-out zoneB1", according to the equation of heat balance of this section Calculate water-cooling wall heat
Coefficient of efficiency ψB1, herein
B. the local heat flux density q obtained according to this section of arrangement heat-flow meter measurementB1, according to the formula of checkCheck the exit gas temperature T for assuming the area B paragraph 1B1", exported if meeting check formula
ψB1；T is assumed again if not meeting check formulaB1", checked until meeting again；
(2) the water-cooling wall thermal effective coefficient ψ of burning-out zone kth layer burnout degree is calculatedBk:
A. assume the exit gas temperature T of burning-out zone kth sectionBk", according to the equation of heat balance of this section Calculating water-cooling wall heat has
Imitate coefficient ψBk, herein
B. the local heat flux density q obtained according to this section of arrangement heat-flow meter measurementBk, according to the formula of checkCheck the exit gas temperature T for assuming the area B kth sectionBk", exported if meeting check formula
ψBk；T is assumed again if not meeting check formulaBk", checked until meeting again；
Wherein, subscript Bk represents the kth section of burning-out zone B, a certain section of the area B that k representation module currently calculates, k-1 representation module
The previous section of current calculation of sector, 1 < k≤b；ΔβcrFor the uncombusted rate of main combustion zone fuel；TBkIt " is exported for the area B kth section
Flue-gas temperature, K；IBkIt " is the area B kth section exiting flue gas enthalpy, kJ/kg, according to TBkIt " looks into and flue gas enthalpy temperature table is taken to obtain；TBkFor the area B
The flue gas mean temperature of kth section, K；FBkFurnace cross-sectional area, m are exported for the area B kth section2；HBkIt conducts heat for the water-cooling wall of the area B kth section
Area, m2；ψBkFor the area B kth section water-cooling wall thermal effective coefficient；qBkFor the local heat flux density for the area the B kth section that heat-flow meter measures,
kW/m2。
6. a kind of furnace of power-plant boilers slagging Multi sectional method of real-time according to claim 1, it is characterised in that:
The method that the c section slagging degree of heat exchange area C is calculated in the step 4 is as follows:
Calculate the water-cooling wall thermal effective coefficient ψ of m layers of heat transfer zone soot blowerCm:
A. assume the exit gas temperature T of heat transfer zone m sectionCm", according to the equation of heat balance of this section Calculate water-cooling wall
Thermal effective coefficient ψCm.Herein as m=1, subscript C (m-1) is equivalent to Bb i.e. b layers of burnout degree of burning-out zone the last layer,And as m > 1,
B. the local heat flux density q obtained according to this section of arrangement heat-flow meter measurementCm, according to the formula of checkCheck the exit gas temperature T for assuming m sections of the area CCm", exported if meeting check formula
ψCm；T is assumed again if not meeting check formulaCm", checked until meeting again；
Wherein, subscript Cm represents the m section of burning-out zone C, a certain section of the area C that m representation module currently calculates, m-1 representation module
The previous section of current calculation of sector, 1≤m≤c；TCmIt " is m sections of the area C exit gas temperature, K；ICm" for the outlet of m sections of the area C
Flue gas enthalpy, kJ/kg, according to TCmIt " looks into and flue gas enthalpy temperature table is taken to obtain；TCmFor m sections of the flue gas mean temperature in the area C, K；FCmFor C
M sections of area outlet furnace cross-sectional area, m2；HCmFor m sections of the water-cooling wall heat transfer area in the area C, m2；ψCmFor m sections of the area C water-cooling wall heat
Coefficient of efficiency；qCmFor the local heat flux density in m sections of the area C that heat-flow meter measures, kW/m2。
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| CN110864316B (en) * | 2019-10-14 | 2021-10-19 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Boiler furnace optimizes soot blowing system based on infrared temperature measurement and numerical calculation |
| CN111523248B (en) * | 2020-05-12 | 2024-05-28 | 国电新能源技术研究院有限公司 | Modeling method for dynamic mechanism model of coal-fired power plant |
| CN115031247A (en) * | 2022-05-30 | 2022-09-09 | 上海发电设备成套设计研究院有限责任公司 | On-line monitoring method and device for deposition degree of ash on radiant heating surface of boiler |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102102870A (en) * | 2011-01-14 | 2011-06-22 | 华北电力大学 | Furnace chamber ash-dirt subarea on-line monitoring device based on acoustic thermometry |
| CN103791515A (en) * | 2014-02-19 | 2014-05-14 | 上海交通大学 | Hearth outlet smoke temperature on-line soft-measurement system of coal-fired boiler |
| CN105276563A (en) * | 2015-11-11 | 2016-01-27 | 东南大学 | Method for soft measurement of smoke temperature of outlet of hearth based on real-time slagging condition of hearth |
-
2017
- 2017-01-23 CN CN201710049520.5A patent/CN106765031B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102102870A (en) * | 2011-01-14 | 2011-06-22 | 华北电力大学 | Furnace chamber ash-dirt subarea on-line monitoring device based on acoustic thermometry |
| CN103791515A (en) * | 2014-02-19 | 2014-05-14 | 上海交通大学 | Hearth outlet smoke temperature on-line soft-measurement system of coal-fired boiler |
| CN105276563A (en) * | 2015-11-11 | 2016-01-27 | 东南大学 | Method for soft measurement of smoke temperature of outlet of hearth based on real-time slagging condition of hearth |
Non-Patent Citations (2)
| Title |
|---|
| 300MW亚临界锅炉炉膛玷污状态判别方法的研究;王军等;《华北电力技术》;20081130;第8-10,31页 |
| 分区段判断锅炉炉膛受热面玷污状态的研究;王军等;《华北电力技术》;20030131;第9-11,14页 |
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