CN104913291B - The detection method of Boiler Steam wall temperature of heated surface - Google Patents

The detection method of Boiler Steam wall temperature of heated surface Download PDF

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Publication number
CN104913291B
CN104913291B CN201510293991.1A CN201510293991A CN104913291B CN 104913291 B CN104913291 B CN 104913291B CN 201510293991 A CN201510293991 A CN 201510293991A CN 104913291 B CN104913291 B CN 104913291B
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steam
temperature
length
measured
enthalpy
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CN104913291A (en
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赵振宁
张清峰
李金晶
李媛园
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State Grid Corp of China SGCC
North China Electric Power Research Institute Co Ltd
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State Grid Corp of China SGCC
North China Electric Power Research Institute Co Ltd
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Abstract

The invention provides the detection method of a kind of Boiler Steam wall temperature of heated surface, relate to boiler temperature detection technique field.Method includes: obtain the inlet steam temperature of steam heating surface, inlet steam pressure, outlet steam temperature, outlet vapor pressure and entrance flue gas temperature;Determine inlet steam enthalpy;Determine the hypothesis vapor (steam) temperature at length to be measured and the steam pressure at length to be measured;Determine inlet flue gas enthalpy;Determine the flue gas enthalpy at length to be measured, and determine the flue-gas temperature at this length to be measured;Determine the first heat transfer temperature difference that this length to be measured is corresponding;So that it is determined that the steam enthalpy liter at this length to be measured;Determine the steam enthalpy at this length to be measured;The second vapor (steam) temperature is obtained according to the steam enthalpy at length to be measured;Judge whether the error of the second vapor (steam) temperature and the first vapor (steam) temperature presets error threshold less than one;If error is less than presetting error threshold, by the second vapor (steam) temperature superposition one preset temperature value, generate the steam wall temperature of heated surface at length to be measured.

Description

The detection method of Boiler Steam wall temperature of heated surface
Technical field
The present invention relates to boiler temperature detection technique field, particularly relate to the detection method of Boiler Steam wall temperature of heated surface.
Background technology
Along with the raising of boiler temperature, the demand currently for boiler operatiopn safety is the most increasing, and boiler tube in stove The selection of steam heating surface just directly affect the operation safety of boiler.Usually, in steam heating surface, Temperature of Working is the highest, choosing Heat-resisting steels grade be also required to the highest, certainly corresponding manufacturing cost is the highest.In order to control manufacturing cost, the most typically Temperature the lowest class steel higher than tube wall temperature can be used according to the tube wall temperature of boiler tube in the stove under working condition.So And, owing to actual operating mode and design design condition exist deviation, easily occurring that heating surface steel grade is on the low side, steam is heated The accident of face booster.
In order to avoid in stove, booster occurs in the steam heating surface of boiler tube, it is currently needed for the steam of boiler tube in stove is heated Face is monitored.As it is shown in figure 1, current monitoring mode is to use boiler tube long service life wall temperature measuring device in a kind of stove, its Including the protecting tube 12 being fastened on boiler tube outer wall 11, the thermocouple 14 being connected with thermal technology's terminal box 16 is from thermoelectricity Pipe 12 one end penetrates, the other end stretches out in even protection, and the thermocouple 14 stretched out i.e. thermocouple temperature measurement end is filled by thermocouple temperature measurement end Put 13 to be fastened on boiler tube outer wall 11 to carry out the thermometric of the steam heating surface of boiler tube in stove.
But, due to bad environments in high-temperature boiler, if protecting tube is damaged, thermocouple also can be quickly invalidated, and surveys Amount result will be affected;And owing to installing of thermocouple limits and protecting tube can weaken the pipe of steam heating surface Wall heat exchange, wall temperature measurement point position can not excessively be goed deep in stove so that is currently only capable of measuring a fraction of wall temperature of steam heating surface, It is difficult to obtain the wall temperature data of same steam heating surface diverse location.Visible, the monitoring of current Boiler Steam wall temperature of heated surface Mode is inaccurate, and is difficult to monitor the wall temperature data of steam heating surface diverse location.
Summary of the invention
Embodiments of the invention provide the detection method of a kind of Boiler Steam wall temperature of heated surface, to solve current boiler steaming The monitoring mode of vapour wall temperature of heated surface is inaccurate, and the problem being difficult to monitor the wall temperature data of steam heating surface diverse location.
For reaching above-mentioned purpose, the present invention adopts the following technical scheme that
A kind of detection method of Boiler Steam wall temperature of heated surface, including:
Step 101, the acquisition inlet steam temperature of steam heating surface, inlet steam pressure, outlet steam temperature, outlet are steamed Steam pressure and entrance flue gas temperature;
Step 102, determine inlet steam enthalpy according to described inlet steam temperature and inlet steam pressure;
Step 103, according to total pipe range of steam heating surface and described inlet steam temperature, outlet steam temperature, determine The first vapor (steam) temperature at entrance one length to be measured of distance steam heating surface, and treat using described first vapor (steam) temperature as described Survey the hypothesis vapor (steam) temperature at length;
Step 104, according to total pipe range of described steam heating surface and described inlet steam pressure, outlet vapor pressure, Determine the steam pressure at described length to be measured;
Step 105, determine described length to be measured according to the steam pressure at described hypothesis vapor (steam) temperature and described length to be measured Steam enthalpy at degree, and determine inlet flue gas enthalpy according to entrance flue gas temperature;
Step 106, according to the steam enthalpy at described inlet steam enthalpy, length to be measured and inlet flue gas enthalpy determine described in treat Survey the flue gas enthalpy at length, and determine the flue-gas temperature at this length to be measured according to the flue gas enthalpy at described length to be measured;
Step 107, according to the flue-gas temperature at described length to be measured, the entrance cigarette of assuming vapor (steam) temperature, steam heating surface Temperature, inlet steam temperature determine the first heat transfer temperature difference that this length to be measured is corresponding;
Step 108, have according to described first heat transfer temperature difference, heat transfer area, steam heating surface pipe heat transfer coefficient and heat Effect coefficient determines the steam enthalpy liter at this length to be measured;
Step 109, according at described length to be measured steam enthalpy rise and described inlet steam enthalpy determine at this length to be measured Steam enthalpy;
Step 110, there is the data base of water vapour thermodynamic features data according to the steam enthalpy at described length to be measured from storage Middle acquisition the second vapor (steam) temperature;
Step 111, judge whether the error of described second vapor (steam) temperature and described first vapor (steam) temperature is preset by mistake less than one Difference limen value;If described error is more than or equal to described default error threshold, replace described hypothesis steam with described second vapor (steam) temperature Temperature, and return execution step 105;
If the described error of step 112 is less than described default error threshold, temperature is preset in described second vapor (steam) temperature superposition one Angle value, generates the steam wall temperature of heated surface at length to be measured.
Concrete, when the porch of described steam heating surface is provided with preposition attemperator, described inlet steam temperature is front Put the mixed vapour temperature between attemperator and influent header;Preposition attemperator is not had in the porch of described steam heating surface Time, described inlet steam temperature is the vapor (steam) temperature of the porch of influent header.
Further, the detection method of described Boiler Steam wall temperature of heated surface, also include:
Outlet vapor enthalpy is determined according to described outlet steam temperature and outlet vapor pressure;
Steam enthalpy liter Δ H according in described inlet steam enthalpy and described outlet vapor enthalpy calculating steam heating surface:
Δ H=H2-H1
Wherein, H2For described outlet vapor enthalpy;H1For described inlet steam enthalpy.
Additionally, the detection method of described Boiler Steam wall temperature of heated surface, also include:
Obtain the exit gas temperature of steam heating surface;
One is calculated according to described exit gas temperature, entrance flue gas temperature, outlet steam temperature and inlet steam temperature Second heat transfer temperature difference Δ t:
Δ t = Δt m a x - Δt min ln ( Δt m a x / Δt min )
Wherein, Δ tmin1-t1, Δ tmax2-t2;Or, Δ tmax1-t1, Δ tmin2-t2;Wherein, Δ tmax More than Δ tmin;θ1For described entrance flue gas temperature, t1For inlet steam temperature, θ2For exit gas temperature, t2For outlet vapor Temperature.
Further, the detection method of described Boiler Steam wall temperature of heated surface, also include:
Obtain heating surface area and the thermal effective coefficient of steam heating surface;
According to steam enthalpy liter, the second heat transfer temperature difference, the heating surface area of steam heating surface and heat in described steam heating surface The coefficient of efficiency described steam heating surface pipe Coefficient K of calculating:
K = Δ H A · Δ t · ζ
Wherein, the steam enthalpy liter in Δ H is described steam heating surface;A is the heating surface area of described steam heating surface;Δt For described second heat transfer temperature difference;ζ is described thermal effective coefficient.
Concrete, described total pipe range according to steam heating surface and described inlet steam temperature, outlet steam temperature, really The first vapor (steam) temperature at entrance one length to be measured of set a distance steam heating surface, including:
Pass through formula:
t l = f ( H ) = t 1 + l L ( t 2 - t 1 )
Calculate described first vapor (steam) temperature tl
Wherein, t1For described inlet steam temperature;t2For described outlet steam temperature;L is the house steward of described steam heating surface Long;L is described length to be measured.
Concrete, described total pipe range according to described steam heating surface and described inlet steam pressure, outlet vapor pressure Power, determines the steam pressure at described length to be measured, including:
Pass through formula:
p l = p 1 - l L ( p 1 - p 2 )
Calculate the steam pressure p at described length to be measuredl
Wherein, p1For described inlet steam pressure;p2For described outlet vapor pressure.
Concrete, described determine described to be measured according to the steam pressure at described hypothesis vapor (steam) temperature and described length to be measured Steam enthalpy at length, and determine inlet flue gas enthalpy according to entrance flue gas temperature, including:
Water vapour thermodynamic features is had from storage according to the steam pressure at described hypothesis vapor (steam) temperature and described length to be measured The data base of data obtains the steam enthalpy at described length to be measured;
Have the data base of flue gas thermodynamic features data from storage according to described entrance flue gas temperature and obtain described entrance cigarette Gas enthalpy.
Concrete, described determine institute according to the steam enthalpy at described inlet steam enthalpy, length to be measured and inlet flue gas enthalpy State the flue gas enthalpy at length to be measured, and determine the flue-gas temperature at this length to be measured according to the flue gas enthalpy at described length to be measured, Including:
Determine at described length to be measured according to the steam enthalpy at described inlet steam enthalpy, length to be measured and inlet flue gas enthalpy Flue gas enthalpy hl:
hl=H1+h1-Hl
Wherein, H1For described inlet steam enthalpy;h1For described inlet flue gas enthalpy;HlSteam enthalpy at described length to be measured;
There is acquisition the data base of flue gas thermodynamic features data described according to the flue gas enthalpy at described length to be measured from storage Flue-gas temperature at length to be measured.
Concrete, described according to the flue-gas temperature at described length to be measured, assume vapor (steam) temperature, the entrance of steam heating surface Flue-gas temperature, inlet steam temperature determine the first heat transfer temperature difference that this length to be measured is corresponding, including:
According to formula:
Δt l = Δt m a x ′ - Δt m i n ′ l n ( Δt m a x ′ / Δt m i n ′ )
Calculate described first heat transfer temperature difference Δ tl
Wherein, Δ t 'min1-t1, Δ t 'maxl-tl;Or, Δ t 'max1-t1, Δ t 'minl-tl;Wherein, Δt′maxMore than Δ t 'min;θ1For described entrance flue gas temperature, t1For inlet steam temperature, θlFor the cigarette at described length to be measured Temperature, tlFor described first vapor (steam) temperature.
Concrete, described according to described first heat transfer temperature difference, heat transfer area, steam heating surface pipe heat transfer coefficient and heat Coefficient of efficiency determines the steam enthalpy liter at this length to be measured, including:
According to formula:
ΔHl=K Al·Δtl·ζ
Calculate the steam enthalpy at described length to be measured and rise Δ Hl;Wherein, K is described steam heating surface pipe heat transfer coefficient;Al For described heat transfer area;ΔtlFor described first heat transfer temperature difference;ζ is described thermal effective coefficient.
Concrete, described rise according to the steam enthalpy at described length to be measured and described inlet steam enthalpy determines this length to be measured The steam enthalpy at place, including:
According to formula: Hl=H1+ΔHlCalculate the steam enthalpy H at described length to be measuredl
The detection method of the Boiler Steam wall temperature of heated surface that the embodiment of the present invention provides, it is not necessary to increase in high-temperature boiler and survey Amount equipment, can be calculated distance steam heating surface by the pressure and temperature measuring point data of steam heating surface entrance and exit Steam wall temperature of heated surface at the length to be measured of porch, it is possible to obtain the wall temperature of steam heating surface diverse location the most easily Data, it is to avoid the monitoring mode of current Boiler Steam wall temperature of heated surface is inaccurate, and it is different to be difficult to monitor steam heating surface The problem of the wall temperature data of position.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, also may be used To obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the installation of TC schematic diagram of boiler tube long service life wall temperature measuring device in stove of the prior art;
The flow chart one of the detection method of a kind of Boiler Steam wall temperature of heated surface that Fig. 2 provides for the embodiment of the present invention;
The schematic diagram one of the Boiler Steam heated face structure that Fig. 3 provides for the embodiment of the present invention;
The schematic diagram two of the Boiler Steam heated face structure that Fig. 4 provides for the embodiment of the present invention;
The flowchart 2 of the detection method of a kind of Boiler Steam wall temperature of heated surface that Fig. 5 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise Embodiment, broadly falls into the scope of protection of the invention.
As in figure 2 it is shown, the detection method of the Boiler Steam wall temperature of heated surface of embodiment of the present invention offer, including:
Step 101, the acquisition inlet steam temperature of steam heating surface, inlet steam pressure, outlet steam temperature, outlet are steamed Steam pressure and entrance flue gas temperature.
Step 102, determine inlet steam enthalpy according to inlet steam temperature and inlet steam pressure.
Step 103, according to total pipe range of steam heating surface and inlet steam temperature, outlet steam temperature, determine distance The first vapor (steam) temperature at entrance one length to be measured of steam heating surface, and using the first vapor (steam) temperature as length to be measured at vacation If vapor (steam) temperature.
Step 104, according to total pipe range of steam heating surface and inlet steam pressure, outlet vapor pressure, determine to be measured Steam pressure at length.
Step 105, according to assuming that the steam pressure at vapor (steam) temperature and length to be measured determines the steam enthalpy at length to be measured, And determine inlet flue gas enthalpy according to entrance flue gas temperature.
Step 106, determine at length to be measured according to the steam enthalpy at inlet steam enthalpy, length to be measured and inlet flue gas enthalpy Flue gas enthalpy, and determine the flue-gas temperature at this length to be measured according to the flue gas enthalpy at length to be measured.
Step 107, according to the flue-gas temperature at length to be measured, the inlet flue gas temperature of assuming vapor (steam) temperature, steam heating surface Degree, inlet steam temperature determine the first heat transfer temperature difference that this length to be measured is corresponding.
Step 108, according to the first heat transfer temperature difference, heat transfer area, steam heating surface pipe heat transfer coefficient and heat effectively system Number determines the steam enthalpy liter at this length to be measured.
Step 109, according at length to be measured steam enthalpy rise and inlet steam enthalpy determine the steam enthalpy at this length to be measured.
Step 110, have the data base of water vapour thermodynamic features data from storage according to the steam enthalpy at length to be measured and obtain Take the second vapor (steam) temperature.
Step 111, judge whether the error of the second vapor (steam) temperature and the first vapor (steam) temperature presets error threshold less than one.
If step 112 error is less than presetting error threshold, by the second vapor (steam) temperature superposition one preset temperature value, generation is treated Survey the steam wall temperature of heated surface at length.
If step 113 error is more than or equal to presetting error threshold, replaces with the second vapor (steam) temperature and assume vapor (steam) temperature, and Return and perform step 105.
The detection method of the Boiler Steam wall temperature of heated surface that the embodiment of the present invention provides, it is not necessary to increase in high-temperature boiler and survey Amount equipment, can be calculated distance steam heating surface by the pressure and temperature measuring point data of steam heating surface entrance and exit Steam wall temperature of heated surface at the length to be measured of porch, it is possible to obtain the wall temperature of steam heating surface diverse location the most easily Data, it is to avoid the monitoring mode of current Boiler Steam wall temperature of heated surface is inaccurate, and it is different to be difficult to monitor steam heating surface The problem of the wall temperature data of position.
What deserves to be explained is, the application scenarios of the detection method of the Boiler Steam wall temperature of heated surface that the embodiment of the present invention provides Be a Boiler Steam heated face structure, its easy structure as it is shown on figure 3, the most complete structure as shown in Figure 4.
As it is shown on figure 3, this Boiler Steam heated face structure includes: boiler setting 21, steam heating surface tube 22, it is subject at steam The entrance and exit of hot side pipe 22 is connected to influent header 23 and outlet header 24, can also set outside this influent header 23 It is equipped with preposition attemperator 25, it is of course also possible to be not provided with preposition attemperator 25., what deserves to be explained is, if at steam heating surface Porch is provided with preposition attemperator, and inlet steam temperature should be the mixed vapour temperature between preposition attemperator and influent header; If do not have preposition attemperator in the porch of steam heating surface, then inlet steam temperature can be the steaming of porch of influent header Stripping temperature.
As shown in Figure 4, this Boiler Steam heated face structure includes: steam-water separator 31, water storage tank 32, middle mixing header 33, circulating pump 34, upper vertical water-cooling wall 35, lower part helical water-cooling wall 36, superheater panel superheater 37, finishing superheater are started 38, final reheater 39, vertical low temperature reheater 40, horizontal low-temperature reheater 41, vertical low temperature overheater 42, horizontal low temperature mistake Hot device 43, economizer 44, economizer exit ash bucket 45, denitrification apparatus 46, pre-heater inlet flue 47, air preheater 48, combustion The big bellows of burner spout 49, burner 50, burner SOFA wind snout 51.
In the detection method of above-mentioned Boiler Steam wall temperature of heated surface, this outlet steam temperature should be this steam heating surface Outlet mixed vapour temperature.
It addition, the preset temperature value of this second vapor (steam) temperature superposition can be typically to pre-set according to engineering experience, example As, this preset temperature value can be 25 DEG C, 30 DEG C or 35 DEG C, but is not only limited to this.
In order to make those skilled in the art be better understood by the present invention, a more detailed embodiment is set forth below, As it is shown in figure 5, the detection method of a kind of Boiler Steam wall temperature of heated surface of embodiment of the present invention offer, including:
Step 201, the acquisition inlet steam temperature of steam heating surface, inlet steam pressure, outlet steam temperature, outlet are steamed Steam pressure, entrance flue gas temperature and exit gas temperature.
Herein, this entrance flue gas temperature and exit gas temperature can be determined according to the flue-gas temperature before economizer;Or, This entrance flue gas temperature and exit gas temperature is determined according to the flue-gas temperature before and after air preheater.
Step 202, determine inlet steam enthalpy according to inlet steam temperature and inlet steam pressure, and according to outlet vapor temperature Degree and outlet vapor pressure determine outlet vapor enthalpy.
Concrete, can there be water vapour thermodynamic features data according to inlet steam temperature and inlet steam pressure from storage Data base obtains inlet steam enthalpy.Same, water can be had according to outlet steam temperature and outlet vapor pressure to steam from storage The data base of vapour thermodynamic features data obtains inlet steam enthalpy.
Step 203, calculate the steam enthalpy in steam heating surface according to inlet steam enthalpy and outlet vapor enthalpy and rise Δ H.
Specifically can be realized by equation below:
Δ H=H2-H1
Wherein, H2For outlet vapor enthalpy;H1For inlet steam enthalpy.
Step 204, according to exit gas temperature, entrance flue gas temperature, outlet steam temperature and inlet steam temperature meter Calculate one second heat transfer temperature difference Δ t.
Δ t = Δt m a x - Δt min ln ( Δt m a x / Δt min )
Wherein, Δ tmin1-t1, Δ tmax2-t2;Or, Δ tmax1-t1, Δ tmin2-t2;Wherein, Δ tmax More than Δ tmin;θ1For entrance flue gas temperature, t1For inlet steam temperature, θ2For exit gas temperature, t2For outlet steam temperature.
Step 205, the heating surface area obtaining steam heating surface and thermal effective coefficient.
Concrete, the heating surface area of this steam heating surface can be obtained by the external diameter of steam heating surface tube and length computation ?.This thermal effective coefficient refers to the heat of steam heating surface tube actual absorption and the ratio of the heat projecting tube-surface, with steaming The position of vapour heating surface, steam heating surface arrangement are relevant with contamination, and in engineering, this thermal effective coefficient can be in advance Arrange.
Step 206, the steam enthalpy liter according in steam heating surface, the second heat transfer temperature difference, the heating surface area of steam heating surface Steam heating surface pipe Coefficient K is calculated with thermal effective coefficient.
K = Δ H A · Δ t · ζ
Wherein, the steam enthalpy liter in Δ H is steam heating surface;A is the heating surface area of steam heating surface;Δ t is the second biography The hot temperature difference;ζ is thermal effective coefficient.
Step 207, according to total pipe range of steam heating surface and inlet steam temperature, outlet steam temperature, determine distance The first vapor (steam) temperature at entrance one length to be measured of steam heating surface, and using the first vapor (steam) temperature as length to be measured at vacation If vapor (steam) temperature.
Herein, formula can be passed through:
t l = f ( H ) = t 1 + l L ( t 2 - t 1 )
Calculate the first vapor (steam) temperature tl
Wherein, t1For inlet steam temperature;t2For outlet steam temperature;L is total pipe range of steam heating surface;L is length to be measured Degree.
Step 208, according to total pipe range of steam heating surface and inlet steam pressure, outlet vapor pressure, determine to be measured Steam pressure at length.
Herein, formula can be passed through:
p l = p 1 - l L ( p 1 - p 2 )
Calculate the steam pressure p at length to be measuredl
Wherein, p1For inlet steam pressure;p2For outlet vapor pressure.
Step 209, according to assuming that the steam pressure at vapor (steam) temperature and length to be measured has water vapour thermodynamic features from storage The data base of data obtains the steam enthalpy at length to be measured.
Step 210, have the data base of flue gas thermodynamic features data from storage according to entrance flue gas temperature and obtain entrance cigarette Gas enthalpy.
Step 211, determine at length to be measured according to the steam enthalpy at inlet steam enthalpy, length to be measured and inlet flue gas enthalpy Flue gas enthalpy hl
hl=H1+h1-Hl
Wherein, H1For inlet steam enthalpy;h1For inlet flue gas enthalpy;HlSteam enthalpy at length to be measured.H hereinl=H1+ h1-HlBe to obtain according to energy conservation relation, i.e. flue gas heat release is absorbed heat equal to steam.
Step 212, have the data base of flue gas thermodynamic features data from storage according to the flue gas enthalpy at length to be measured and obtain Flue-gas temperature at length to be measured.
Step 213, according to the flue-gas temperature at length to be measured, the inlet flue gas temperature of assuming vapor (steam) temperature, steam heating surface Degree, inlet steam temperature determine the first heat transfer temperature difference that this length to be measured is corresponding.
Herein, can be according to formula:
Δt l = Δt m a x ′ - Δt m i n ′ l n ( Δt m a x ′ / Δt m i n ′ )
Calculate the first heat transfer temperature difference Δ tl
Wherein, Δ t 'min1-t1, Δ t 'maxl-tl;Or, Δ t 'max1-t1, Δ t 'minl-tl;Wherein, Δt′maxMore than Δ t 'min;θ1For entrance flue gas temperature, t1For inlet steam temperature, θlFor the flue-gas temperature at length to be measured, tl It it is the first vapor (steam) temperature.
Step 214, according to the first heat transfer temperature difference, heat transfer area, steam heating surface pipe heat transfer coefficient and heat effectively system Number determines the steam enthalpy liter at this length to be measured.
Herein, can be according to formula:
ΔHl=K Al·Δtl·ζ
Calculate the steam enthalpy at length to be measured and rise Δ Hl;Wherein, K is steam heating surface pipe heat transfer coefficient;AlFor heat-transfer area Long-pending;ΔtlIt it is the first heat transfer temperature difference;ζ is thermal effective coefficient.
Step 215, according at length to be measured steam enthalpy rise and inlet steam enthalpy determine the steam enthalpy at this length to be measured.
Herein, can be according to formula: Hl=H1+ΔHlCalculate the steam enthalpy H at length to be measuredl
Step 216, have the data base of water vapour thermodynamic features data from storage according to the steam enthalpy at length to be measured and obtain Take the second vapor (steam) temperature.
Step 217, judge whether the error of the second vapor (steam) temperature and the first vapor (steam) temperature presets error threshold less than one.
If error is more than or equal to presetting error threshold, perform step 218.If error is less than presetting error threshold, perform step Rapid 219.
Step 218, with second vapor (steam) temperature replace assume vapor (steam) temperature.After step 218, execution step 209 is returned.
Step 219, by the second vapor (steam) temperature superposition one preset temperature value, generate the steam at length to be measured and be heated and face the wall and meditate Temperature.
Preset temperature value can be typically to pre-set according to engineering experience, such as, this preset temperature value can be 25 DEG C, 30 DEG C or 35 DEG C, but it is not only limited to this.
The detection method of the Boiler Steam wall temperature of heated surface that the embodiment of the present invention provides, it is not necessary to increase in high-temperature boiler and survey Amount equipment, can be calculated distance steam heating surface by the pressure and temperature measuring point data of steam heating surface entrance and exit Steam wall temperature of heated surface at the length to be measured of porch, it is possible to obtain the wall temperature of steam heating surface diverse location the most easily Data, it is to avoid the monitoring mode of current Boiler Steam wall temperature of heated surface is inaccurate, and it is different to be difficult to monitor steam heating surface The problem of the wall temperature data of position.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or computer program Product.Therefore, the reality in terms of the present invention can use complete hardware embodiment, complete software implementation or combine software and hardware Execute the form of example.And, the present invention can use at one or more computers wherein including computer usable program code The upper computer program product implemented of usable storage medium (including but not limited to disk memory, CD-ROM, optical memory etc.) The form of product.
The present invention is with reference to method, equipment (system) and the flow process of computer program according to embodiments of the present invention Figure and/or block diagram describe.It should be understood that can the most first-class by computer program instructions flowchart and/or block diagram Flow process in journey and/or square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided Instruction arrives the processor of general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce A raw machine so that the instruction performed by the processor of computer or other programmable data processing device is produced for real The device of the function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame now.
These computer program instructions may be alternatively stored in and computer or other programmable data processing device can be guided with spy Determine in the computer-readable memory that mode works so that the instruction being stored in this computer-readable memory produces and includes referring to Make the manufacture of device, this command device realize at one flow process of flow chart or multiple flow process and/or one square frame of block diagram or The function specified in multiple square frames.
These computer program instructions also can be loaded in computer or other programmable data processing device so that at meter Perform sequence of operations step on calculation machine or other programmable devices to produce computer implemented process, thus at computer or The instruction performed on other programmable devices provides for realizing at one flow process of flow chart or multiple flow process and/or block diagram one The step of the function specified in individual square frame or multiple square frame.
The present invention applies specific embodiment principle and the embodiment of the present invention are set forth, above example Explanation be only intended to help to understand method and the core concept thereof of the present invention;Simultaneously for one of ordinary skill in the art, According to the thought of the present invention, the most all will change, in sum, in this specification Hold and should not be construed as limitation of the present invention.

Claims (12)

1. the detection method of a Boiler Steam wall temperature of heated surface, it is characterised in that including:
Step 101, the acquisition inlet steam temperature of steam heating surface, inlet steam pressure, outlet steam temperature, outlet vapor pressure Power and entrance flue gas temperature;
Step 102, determine inlet steam enthalpy according to described inlet steam temperature and inlet steam pressure;
Step 103, according to total pipe range of steam heating surface and described inlet steam temperature, outlet steam temperature, determine distance The first vapor (steam) temperature at entrance one length to be measured of steam heating surface, and using described first vapor (steam) temperature as described length to be measured Hypothesis vapor (steam) temperature at degree;
Step 104, according to total pipe range of described steam heating surface and described inlet steam pressure, outlet vapor pressure, determine Steam pressure at described length to be measured;
Step 105, determine at described length to be measured according to the steam pressure at described hypothesis vapor (steam) temperature and described length to be measured Steam enthalpy, and determine inlet flue gas enthalpy according to entrance flue gas temperature;
Step 106, determine described length to be measured according to the steam enthalpy at described inlet steam enthalpy, length to be measured and inlet flue gas enthalpy Flue gas enthalpy at degree, and determine the flue-gas temperature at this length to be measured according to the flue gas enthalpy at described length to be measured;
Step 107, according to the flue-gas temperature at described length to be measured, the inlet flue gas temperature of assuming vapor (steam) temperature, steam heating surface Degree, inlet steam temperature determine the first heat transfer temperature difference that this length to be measured is corresponding;
Step 108, according to described first heat transfer temperature difference, heat transfer area, steam heating surface pipe heat transfer coefficient and heat effectively system Number determines the steam enthalpy liter at this length to be measured;
Step 109, according at described length to be measured steam enthalpy rise and described inlet steam enthalpy determine the steaming at this length to be measured Vapour enthalpy;
Step 110, have the data base of water vapour thermodynamic features data from storage according to the steam enthalpy at described length to be measured and obtain Take the second vapor (steam) temperature;
Step 111, judge whether the error of described second vapor (steam) temperature and described first vapor (steam) temperature presets error threshold less than one Value;If described error is more than or equal to described default error threshold, replace described hypothesis vapor (steam) temperature with described second vapor (steam) temperature, And return execution step 105;
If the described error of step 112 is less than described default error threshold, by described second vapor (steam) temperature superposition one preset temperature Value, generates the steam wall temperature of heated surface at length to be measured.
The detection method of Boiler Steam wall temperature of heated surface the most according to claim 1, it is characterised in that be subject at described steam When the porch of hot side is provided with preposition attemperator, described inlet steam temperature is the mixing between preposition attemperator and influent header Vapor (steam) temperature;When the porch of described steam heating surface does not has preposition attemperator, described inlet steam temperature is influent header The vapor (steam) temperature of porch.
The detection method of Boiler Steam wall temperature of heated surface the most according to claim 1, it is characterised in that also include:
Outlet vapor enthalpy is determined according to described outlet steam temperature and outlet vapor pressure;
Steam enthalpy liter Δ H according in described inlet steam enthalpy and described outlet vapor enthalpy calculating steam heating surface:
Δ H=H2-H1
Wherein, H2For described outlet vapor enthalpy;H1For described inlet steam enthalpy.
The detection method of Boiler Steam wall temperature of heated surface the most according to claim 3, it is characterised in that also include:
Obtain the exit gas temperature of steam heating surface;
One second is calculated according to described exit gas temperature, entrance flue gas temperature, outlet steam temperature and inlet steam temperature Heat transfer temperature difference Δ t:
Δ t = Δt m a x - Δt min ln ( Δt max / Δt min )
Wherein, Δ tmin1-t1, Δ tmax2-t2;Or, Δ tmax1-t1, Δ tmin2-t2;Wherein, Δ tmaxIt is more than Δtmin;θ1For described entrance flue gas temperature, t1For inlet steam temperature, θ2For exit gas temperature, t2For outlet steam temperature.
The detection method of Boiler Steam wall temperature of heated surface the most according to claim 4, it is characterised in that also include:
Obtain heating surface area and the thermal effective coefficient of steam heating surface;
Effective according to steam enthalpy liter, the second heat transfer temperature difference, the heating surface area of steam heating surface and the heat in described steam heating surface Steam heating surface pipe Coefficient K described in coefficient calculations:
K = Δ H A · Δ t · ζ
Wherein, the steam enthalpy liter in Δ H is described steam heating surface;A is the heating surface area of described steam heating surface;Δ t is institute State the second heat transfer temperature difference;ζ is described thermal effective coefficient.
The detection method of Boiler Steam wall temperature of heated surface the most according to claim 1, it is characterised in that described according to steam Total pipe range of heating surface and described inlet steam temperature, outlet steam temperature, determine that the entrance one of distance steam heating surface is treated Survey the first vapor (steam) temperature at length, including:
Pass through formula:
t l = f ( H ) = t 1 + l L ( t 2 - t 1 )
Calculate described first vapor (steam) temperature tl
Wherein, t1For described inlet steam temperature;t2For described outlet steam temperature;L is total pipe range of described steam heating surface;l For described length to be measured.
The detection method of Boiler Steam wall temperature of heated surface the most according to claim 6, it is characterised in that described in described basis Total pipe range of steam heating surface and described inlet steam pressure, outlet vapor pressure, determine the steam at described length to be measured Pressure, including:
Pass through formula:
p l = p 1 - l L ( p 1 - p 2 )
Calculate the steam pressure p at described length to be measuredl
Wherein, p1For described inlet steam pressure;p2For described outlet vapor pressure.
The detection method of Boiler Steam wall temperature of heated surface the most according to claim 7, it is characterised in that described in described basis Assume that the steam pressure at vapor (steam) temperature and described length to be measured determines the steam enthalpy at described length to be measured, and according to entrance cigarette Temperature determines inlet flue gas enthalpy, including:
Water vapour thermodynamic features data are had from storage according to the steam pressure at described hypothesis vapor (steam) temperature and described length to be measured Data base in obtain the steam enthalpy at described length to be measured;
Have the data base of flue gas thermodynamic features data from storage according to described entrance flue gas temperature and obtain described inlet flue gas enthalpy.
The detection method of Boiler Steam wall temperature of heated surface the most according to claim 8, it is characterised in that described in described basis Steam enthalpy at inlet steam enthalpy, length to be measured and inlet flue gas enthalpy determine the flue gas enthalpy at described length to be measured, and according to Flue gas enthalpy at described length to be measured determines the flue-gas temperature at this length to be measured, including:
The cigarette at described length to be measured is determined according to the steam enthalpy at described inlet steam enthalpy, length to be measured and inlet flue gas enthalpy Gas enthalpy hl:
hl=H1+h1-Hl
Wherein, H1For described inlet steam enthalpy;h1For described inlet flue gas enthalpy;HlSteam enthalpy at described length to be measured;
Have from storage according to the flue gas enthalpy at described length to be measured the data base of flue gas thermodynamic features data obtains described to be measured Flue-gas temperature at length.
The detection method of Boiler Steam wall temperature of heated surface the most according to claim 9, it is characterised in that described according to institute State the flue-gas temperature at length to be measured, assume that vapor (steam) temperature, the entrance flue gas temperature of steam heating surface, inlet steam temperature determine The first heat transfer temperature difference that this length to be measured is corresponding, including:
According to formula:
Δt l = Δt m a x ′ - Δt min ′ l n ( Δt m a x ′ / Δt min ′ )
Calculate described first heat transfer temperature difference Δ tl
Wherein, Δ t 'min1-t1, Δ t 'maxl-tl;Or, Δ t 'max1-t1, Δ t 'minl-tl;Wherein, Δ t′maxMore than Δ t 'min;θ1For described entrance flue gas temperature, t1For inlet steam temperature, θlFor the flue gas at described length to be measured Temperature, tlFor described first vapor (steam) temperature.
The detection method of 11. Boiler Steam wall temperature of heated surfaces according to claim 10, it is characterised in that described according to institute State the first heat transfer temperature difference, heat transfer area, steam heating surface pipe heat transfer coefficient and thermal effective coefficient to determine at this length to be measured Steam enthalpy liter, including:
According to formula:
ΔHl=K Al·Δtl·ζ
Calculate the steam enthalpy at described length to be measured and rise Δ Hl;Wherein, K is described steam heating surface pipe heat transfer coefficient;AlFor institute State heat transfer area;ΔtlFor described first heat transfer temperature difference;ζ is described thermal effective coefficient.
The detection method of 12. Boiler Steam wall temperature of heated surfaces according to claim 11, it is characterised in that described according to institute State the liter of the steam enthalpy at length to be measured and described inlet steam enthalpy determines the steam enthalpy at this length to be measured, including:
According to formula: Hl=H1+ΔHlCalculate the steam enthalpy H at described length to be measuredl
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