CN2916602Y - External wall temperature measuring point structure for boiler super-heater/reheater with reduced measuring error - Google Patents

External wall temperature measuring point structure for boiler super-heater/reheater with reduced measuring error Download PDF

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Publication number
CN2916602Y
CN2916602Y CN 200620039764 CN200620039764U CN2916602Y CN 2916602 Y CN2916602 Y CN 2916602Y CN 200620039764 CN200620039764 CN 200620039764 CN 200620039764 U CN200620039764 U CN 200620039764U CN 2916602 Y CN2916602 Y CN 2916602Y
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China
Prior art keywords
boiler
measuring point
heat
temperature
reheater
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Expired - Fee Related
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CN 200620039764
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Chinese (zh)
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王衡
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王衡
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Priority to CN 200620039764 priority Critical patent/CN2916602Y/en
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Abstract

The utility model relates to a boiler overheater reheater external wall testing point mechanism for lowering measuring error, which is characterized in that: the boiler external wall temperature measuring point structure on the leading tube section of the overheater and reheater in the big cover shell on the top of the boiler is a welded heat collection block, which is welded with the tube at three sides. An armed thermocouple is inserted into the heat collection block from the above to below. The measuring point external part is covered with a heat preservation layer of 100mm thickness.

Description

Reduce the boiler superheater reheater furnace outer wall temperature measuring point structure of measuring error
Technical field: the utility model relates to station boiler and other boiler technology fields, is specifically to reduce the furnace outer wall temperature measuring point of boiler superheater or reheater because of causing measuring the big a kind of structure of temperature amount error on the low side too greatly to the environment heat dissipation capacity.
Technical background: the superheater reheater of boiler respectively shields pipe outlet furnace outer wall temperature measuring point, being a kind of necessary device of indication tube temperature level height in boiler operatiopn, also is the quantitative basis of the gentle life consumption of the online calculating pipe of superheater reheater on-line monitoring system stove inwall.The purpose of this measuring point is the vapor (steam) temperature in the measuring tube.If it is on the low side more too many than the vapor (steam) temperature in the pipe that it measures temperature, it is not high then can to present the tube panel temperature levels when the tube panel actual temperature is higher yet, does not have the illusion of overtemperature situation, thereby makes boiler operatiopn dangerous.Find by analyzing a large amount of measured data, China at present on the high capacity station boiler the used outer wall temperature measuring point of traditional burner can make the measurement temperature on the low side more than 10 ℃ because structure is reasonable inadequately.This badly influences the whether judgement of overtemperature of pipe.Particularly the overcritical and ultra-supercritical boiler of the above capacity of 600MW is measured temperature 10 ℃ of life consumptions that resistant to elevated temperatures steel are calculated on the low side and is differed one times.For example measuring error is 10 ℃ on the low side, and the life-span of Ji Suaning just in time meets the pipeline section of 100,000 hours designed lives in view of the above, and actual conditions are 10 ℃ of overtemperatures, have had only 5.6 ten thousand hours serviceable life.
There are following 3 irrational factors in the outer wall temperature measuring point structure of at present used traditional burner:
1. the measuring point place does not add special insulation.Because the wall temperature measuring point is contained in the big case of boiler furnace roof, tradition just thinks that being equivalent to collective is incubated, thereby the measuring point place does not add special insulation.In fact the environment temperature in the big case has only 450~500 ℃, and the outlet temperature of superheater reheater deviation pipe is 570~630 ℃, far above the environment temperature in the big case.There is the temperature difference that hot-fluid is just arranged.The measuring point place along pipe radially hot-fluid and along thermopair longitudinally hot-fluid can make and measure temperature and be lower than vapor (steam) temperature in the pipe, cause measuring error.
2. inner heat-collecting block and the tested pipe of placing thermopair is that spot welding is fixed, and causes between heat-collecting block and the tube wall and produces the temperature difference.
3. the screw that is used for fixing thermopair directly withstands the hot junction of thermopair, and hot junction is increased to the heat dissipation capacity of environment, and measuring error also increases thus.
From the thermal equilibrium analysis of thermojunction, the hot-fluid that flows to hot junction from tube outer wall is q; Hot junction is q to environment along pipe heat radiation hot-fluid radially 1Heat radiation hot-fluid along the thermopair longitudinal direction is q 2When reaching thermal equilibrium, following relational expression is arranged:
q=q 1+q 2=αd(twb-trd) (kJ/m 2h) (1)
twb-trd=q/αd=(q 1+q 2)/αd (℃) (2)
In the formula: the equivalent coefficient of heat emission (kJ/m between α d---------------thermopair and tube wall 2H ℃)
The temperature of trd---------------thermojunction (℃)
From top two equations as can be seen, measure accurately for making, promptly (twb-trd) value is little, should reduce q as far as possible 1And q 2, increasing α d, this just requires:
(1) for reducing q 1And q 2, should add heat-insulation layer at measuring point place pipe;
(2) should increase α d value, even three full welds of heat-collecting block and tube wall.
Summary of the invention: main points of the present utility model are: propose two kinds of new constructions of eliminating the traditional structure unreasonable factor, to reduce measuring error as far as possible.
Two kinds of new constructions that the utility model proposed, can make thermopair to environment along pipe radially heat radiation hot-fluid q1 and be reduced to minimum level along the heat radiation hot-fluid q2 of thermopair longitudinal direction; Make measuring error from traditional structure be reduced to 1~2 ℃ greater than 10 ℃, to satisfy the requirement of station boiler safe operation.
For reaching the technical scheme that above-mentioned purpose is taked: the utility model welds heat-collecting block on the superheater reheater pipe fairlead section on the boiler boiler roof sealing plate top of prior art.Three full welds of heat-collecting block and pipe.Thermopair is from top insertion heat-collecting block.Housing screw is leaving hot junction one segment distance place stationary heat galvanic couple.Measuring point is outside to be applied with the heat-insulation layer greater than 100mm thickness.
Description of drawings:
Fig. 1 is the utility model structural drawing;
Fig. 2 is another example structure of the utility model figure;
Embodiment: existing electricity generation boiler, traditional superheater reheater tube subexit furnace outer wall temperature measuring point structure has the measuring error on the low side greater than 10 ℃.The utility model welds heat-collecting block 3 as shown in Figure 1 on the superheater reheater tube subexit pipeline section 2 on boiler roof sealing plate 1 top in the big case of boiler furnace roof.Heat-collecting block 3 and 2 three full welds of pipeline section.Armoured thermocouple 5 inserts the hole of heat-collecting block from facing down.The screw 7 that compresses thermopair is located the stationary heat galvanic couple leaving hot junction 6 one segment distances (about 15mm).Measuring point is outside to be applied with the insulation material 4 greater than 100mm thickness.
Embodiment two welds heat-collecting block 3 as shown in Figure 2 on the superheater reheater tube subexit pipeline section 2 on boiler roof sealing plate 1 top in the big case of boiler furnace roof.Heat-collecting block 3 and 2 three full welds of pipeline section.Armoured thermocouple 5 inserts the protective casing 6 from facing down.Protective casing 6 welds mutually with pipeline section 2.Measuring point is outside to be applied with the insulation material 4 greater than 100mm thickness.The advantage of embodiment two is can change armoured thermocouple 5 in boiler operatiopn.

Claims (2)

1. the boiler superheater reheater furnace outer wall temperature measuring point structure that originally reduces measuring error is a kind of measuring point structure of being made up of armoured thermocouple (5), heat-collecting block (3), housing screw (7), insulation material (4) that reduces boiler superheater reheater furnace outer wall temperature measurement error, it is characterized in that heat-collecting block (3) and (2) three full welds of tested pipeline section that are in boiler roof sealing plate (1) top in the big case of boiler, the screw (7) that compresses thermopair leaves thermojunction (6) one segment distances, and the measuring point external application is with the insulation material (4) of thickness greater than 100mm.
2. the boiler superheater reheater furnace outer wall temperature measuring point structure that originally reduces measuring error is a kind of measuring point structure of being made up of armoured thermocouple (5), heat-collecting block (3), protective casing (6), insulation material (4) that reduces boiler superheater reheater furnace outer wall temperature measurement error; it is characterized in that heat-collecting block (3) and (2) three full welds of tested pipeline section that are in boiler roof sealing plate (1) top in the big case of boiler; armoured thermocouple inserts the protective casing (6) from the top, and the measuring point external application is with the insulation material (4) of thickness greater than 100mm.
CN 200620039764 2006-02-27 2006-02-27 External wall temperature measuring point structure for boiler super-heater/reheater with reduced measuring error Expired - Fee Related CN2916602Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200620039764 CN2916602Y (en) 2006-02-27 2006-02-27 External wall temperature measuring point structure for boiler super-heater/reheater with reduced measuring error

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 200620039764 CN2916602Y (en) 2006-02-27 2006-02-27 External wall temperature measuring point structure for boiler super-heater/reheater with reduced measuring error

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CN2916602Y true CN2916602Y (en) 2007-06-27

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101975390A (en) * 2010-05-27 2011-02-16 国电浙江北仑第三发电有限公司 System and method for monitoring wall temperature of heated surface of ultra supercritical boiler
CN101975389A (en) * 2010-05-27 2011-02-16 国电浙江北仑第三发电有限公司 Ultra-supercritical boiler heating-surface wall-temperature monitoring system and monitoring method
CN102322971A (en) * 2011-08-16 2012-01-18 西安热工研究院有限公司 Long service life wall temperature measuring device of boiler tube in boiler
CN103162837A (en) * 2013-02-05 2013-06-19 东华大学 On-line measurement method of fiber temperature
CN104101441A (en) * 2014-07-30 2014-10-15 苏州热工研究院有限公司 Real wall temperature testing system for high-temperature heating surface tube of thermal power unit and manufacturing process
CN104475912A (en) * 2014-11-27 2015-04-01 国核(北京)科学技术研究院有限公司 Armored thermocouple auxiliary welding device and welding method

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101975390A (en) * 2010-05-27 2011-02-16 国电浙江北仑第三发电有限公司 System and method for monitoring wall temperature of heated surface of ultra supercritical boiler
CN101975389A (en) * 2010-05-27 2011-02-16 国电浙江北仑第三发电有限公司 Ultra-supercritical boiler heating-surface wall-temperature monitoring system and monitoring method
CN101975390B (en) * 2010-05-27 2013-04-24 国电浙江北仑第三发电有限公司 System and method for monitoring wall temperature of heated surface of ultra supercritical boiler
CN102322971A (en) * 2011-08-16 2012-01-18 西安热工研究院有限公司 Long service life wall temperature measuring device of boiler tube in boiler
CN102322971B (en) * 2011-08-16 2014-07-16 西安热工研究院有限公司 Long service life wall temperature measuring device of boiler tube in boiler
CN103162837A (en) * 2013-02-05 2013-06-19 东华大学 On-line measurement method of fiber temperature
CN103162837B (en) * 2013-02-05 2015-02-18 东华大学 On-line measurement method of fiber temperature
CN104101441A (en) * 2014-07-30 2014-10-15 苏州热工研究院有限公司 Real wall temperature testing system for high-temperature heating surface tube of thermal power unit and manufacturing process
CN104101441B (en) * 2014-07-30 2017-01-18 苏州热工研究院有限公司 Real wall temperature testing system for high-temperature heating surface tube of thermal power unit and manufacturing process
CN104475912A (en) * 2014-11-27 2015-04-01 国核(北京)科学技术研究院有限公司 Armored thermocouple auxiliary welding device and welding method

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
EE01 Entry into force of recordation of patent licensing contract

Assignee: Shanghai Wangte Energy Resource Science & Technology Co., Ltd.

Assignor: Wang Heng

Contract record no.: 2010310000090

Denomination of utility model: External wall temperature measuring point structure for boiler super-heater/reheater with reduced measuring error

Granted publication date: 20070627

License type: Exclusive License

Record date: 20100623

DD01 Delivery of document by public notice

Addressee: Wang Heng

Document name: Notification of Termination of Patent Right

C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20070627

Termination date: 20130227