CN202141562U - Coal-fired boiler air preheater air leakage on-line monitoring device - Google Patents

Coal-fired boiler air preheater air leakage on-line monitoring device Download PDF

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Publication number
CN202141562U
CN202141562U CN201120266411U CN201120266411U CN202141562U CN 202141562 U CN202141562 U CN 202141562U CN 201120266411 U CN201120266411 U CN 201120266411U CN 201120266411 U CN201120266411 U CN 201120266411U CN 202141562 U CN202141562 U CN 202141562U
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CN
China
Prior art keywords
gas
air
coal
draft tube
oxygen
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CN201120266411U
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Chinese (zh)
Inventor
王家新
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山东电力研究院
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Priority to CN201120266411U priority Critical patent/CN202141562U/en
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Publication of CN202141562U publication Critical patent/CN202141562U/en

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Abstract

The present utility model relates to a coal-fired boiler air preheater air leakage on-line monitoring device which comprises an air preheater arranged on a flue. The device is characterized in that the on-line monitoring device comprises two measuring units, each measuring unit comprises a gas sampling device, a sucking pump, and an oxygen meter for measuring and calculating the oxygen content of a gas sample; the output ends of the gas sampling devices are connected with the input ends of the oxygen meters after passing through the sucking pumps, the input ends of the two gas sampling devices are respectively connected with an inlet flue and an outlet flue of the coal-fired boiler air preheater, and output signals of the two oxygen meters are all connected with a data acquisition system for realizing data processing. By adopting the device, the measurement of the air leakage rate of the air preheater can be realized, and the device is favorable for working personnel to control and maintain according to the state. Moreover, the multiple-spot simultaneous sampling of gases and the weight control sampling of different gas sample inlet air pipes can be realized, and the device has advantages of high detection precision, high reliability and simple and convenient operation.

Description

Coal-burning boiler air-heater leakage on-Line Monitor Device
Technical field
The utility model relates to a kind of coal-burning boiler air-heater leakage on-Line Monitor Device, in particular, relates in particular to a kind of coal-burning boiler air-heater leakage on-Line Monitor Device of carrying out multiple spot gas sample acquisition and the demonstration of air-heater leakage rate.
Background technology
The air preheater of coal-burning boiler is to utilize the heat of boiler tail flue gas to come heating fuel burning required air, to improve the heat-exchange device of boiler efficiency.At present; The high capacity unit adopts the regeneration rotary regenerative air preheater more; With respect to tubular air preheater, it has the advantage that volume is little, in light weight and be convenient to arrange, still; To have a strong impact on the economy of unit when big if leak out, the state that leaks out of measuring air preheater is very important.Because the cross section of the import and export flue of air preheater is bigger; Cause smoke components inhomogeneous; Air-heater leakage test generally adopts the form of multiple spot grid sampling to measure the smoke components of each measuring point, or the mode that multi-measuring point gas appearance is mixed into average gas appearance is analyzed in employing.
The point-to-point measurement smoke components, the big and length consuming time of workload can not guarantee section gauge simultaneously, measuring accuracy is difficult to guarantee.Multiple spot mixes the uniformity consistency that sampling can't guarantee the sampling flow of each measuring point, also is difficult to reach the requirement of accurate sampling.
Summary of the invention
The utility model provides a kind of coal-burning boiler air-heater leakage on-Line Monitor Device of carrying out multiple spot gas sample acquisition and the demonstration of air-heater leakage rate in order to overcome the shortcoming of above-mentioned technical matters.
The coal-burning boiler air-heater leakage on-Line Monitor Device of the utility model comprises the air preheater, inlet flue duct and the exhaust pass that are arranged on the flue; Its special feature is: said on-Line Monitor Device comprises two measuring units respectively gas in inlet flue duct and the exhaust pass being analyzed, the oxygen amount meter that said measuring unit includes gas sampling assembly, aspiration pump and oxygen level is calculated; The output terminal of gas sampling assembly is connected with the input end of oxygen amount meter through after the suction pump; The input end of two gas sampling assemblies is connected on respectively on inlet flue duct and the exhaust pass, and the output signal of said two oxygen amount meters all is connected with the data acquisition system (DAS) that realizes data processing.The measuring unit that is positioned at the inlet flue duct place is used to realize the gas detection of gas approach side, and the measuring unit that is positioned at the exhaust pass place is used to realize the gas detection of exhanst gas outlet side, and realizes the conversion of oxygen level value to corresponding electric signal through corresponding oxygen amount meter; Data acquisition system (DAS) is passed through detection and the calculating to two oxygen amount meter input signals, and then calculates air leak rate of air curtain, has realized the monitoring to preheating of air dress device serviceability.
The coal-burning boiler air-heater leakage on-Line Monitor Device of the utility model; Said gas sampling assembly comprises container body, at least two gas appearance draft tube and a gas appearance fairlead; Be provided with filtered fluid in the container body; The outlet of said gas appearance draft tube extend into below the liquid level of filtered fluid, and the air intake opening of gas appearance fairlead is positioned at the top of filtered fluid liquid level; Also be provided with flowmeter and flow control valve on the said gas appearance draft tube.Container body is a closed container, and it communicates with the external world through the gentle appearance of gas appearance draft tube fairlead; The inlet of gas appearance draft tube is connected with pipeline to be detected, and outlet extend in the filtered fluid; The outlet of gas appearance fairlead is connected with the relevant detection device, and air intake opening is positioned on the liquid level of filtered fluid.Flowmeter and flow control valve are realized the indication of flow registration and the adjusting of flow size respectively, through different gas appearance draft tube is provided with different flows, have realized the weights control sampling to the different acquisition place.The filtered fluid that is provided with in the container body can filter grit in the gas appearance, harmful gas and other need the composition of filtering.
The coal-burning boiler air-heater leakage on-Line Monitor Device of the utility model, at least two gas appearance draft tube on the said sampling apparatus are arranged on the same cross section of inlet flue duct or exhaust pass.This just is equivalent to realize the multiple spot gas sampling to inlet flue duct and exhaust pass, helps guaranteeing the accuracy of sample gas.
The coal-burning boiler air-heater leakage on-Line Monitor Device of the utility model, said data collector system comprise that the air leak rate of air curtain that is used for calculating carries out the data presented display module.Be provided with in the data collector system air leak rate of air curtain is carried out the data presented display module, help the staff air leak rate of air curtain is directly read, more convenient and practical.
The coal-burning boiler air-heater leakage on-Line Monitor Device of the utility model, said oxygen amount meter output terminal is the electrical signal of representative oxygen oxygen amount.Adopting output terminal is the oxygen amount meter of the electrical signal of representative oxygen oxygen amount, helps data acquisition system (DAS) more directly to its direct processing.
The beneficial effect of the utility model is: (1) the utility model is through all being provided with the measuring unit of being made up of gas sampling assembly, suction pump and oxygen amount meter in inlet flue duct side and exhaust pass side; And the data acquisition system (DAS) that is connected with two oxygen amount meter output terminals; Realized measurement to the air-heater leakage state; Help the staff and control its running status, and it is controlled and safeguard according to state; (2) be provided with a plurality of gas appearance draft tube in the gas sampling assembly in the utility model, realized the multiple spot of flue is sampled simultaneously, make it meet the requirement of experiment rules, make testing result have the advantage of high measurement accuracy and high reliability; (3) also the flow control valve that carries out flow regulation can be set on the gas appearance draft tube in the utility model, can come different gas appearance draft tube is carried out weights control sampling, further facilitate use according to actual conditions.
Description of drawings
Fig. 1 is the structural representation of the utility model;
Fig. 2 is the structural representation of gas sampling assembly in the utility model.
Among the figure: 1 gas sampling assembly, 2 suction pumps, 3 oxygen amount meters, 4 data acquisition system (DAS)s, 5 inlet flue ducts, 6 exhaust pass, 7 air preheaters, 8 container body, 9 gas appearance draft tube, 10 flowmeters, 11 flow control valves, 12 gas appearance fairleads, 13 filtered fluids.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
As shown in Figure 1; Provided the coal-burning boiler air-heater leakage on-Line Monitor Device structural representation of the utility model, it comprises inlet flue duct 5, exhaust pass 6, air preheater 7, gas sampling assembly 1, suction pump 2, oxygen amount meter 3, data acquisition system (DAS); Shown inlet flue duct 5 communicates with exhaust pass 6 through air preheater 7 backs; The gas sampling assembly 1, suction pump 2, the oxygen amount meter 3 that are used to detect inlet flue duct 5 side gas properties have been formed a measuring unit, and the gas sampling assembly 1, suction pump 2, the oxygen amount meter 3 that are used to detect exhaust pass 6 side gas properties have been formed another measuring unit.The draft tube of the gas sampling assembly 1 in two measuring units can adopt a plurality of, and it is arranged on the place, same sectional position of flue; The output terminal of gas sampling assembly 1 is connected with the input end of oxygen amount meter 3 through suction pump 2 backs; Oxygen amount meter 3 can be converted into electric signal to oxygen oxygen amount signal in the gas that detects; Be input in the data acquisition system (DAS) 4, be provided with data disaply moudle in the data acquisition system (DAS).Data acquisition system (DAS) 4 calculates the air leak rate of air curtain of air preheater 7 through collection and computing to two oxygen amount meters, 3 output datas, and shows through data disaply moudle.The utility model has been realized the calculating to oxygen level in the gas of air preheater both sides through two measuring units, and passes through the computing of data acquisition system (DAS) 4, has drawn the air leak rate of air curtain of air preheater, is convenient to operating personnel and controls.
A plurality of gas appearance draft tube can be set on the gas sampling assembly 1, realize the multiple spot of flue is sampled simultaneously; On gas appearance draft tube 9, flow control valve is set, can comes different gas appearance draft tube is carried out weights control sampling according to actual conditions, gas sampling assembly 1 provides in Fig. 2.
As shown in Figure 2, provided the structural representation of gas sampling assembly in the utility model, it comprises container body 8, gas appearance draft tube 9, gas appearance fairlead 12, flowmeter 10, flow control valve 11, filtered fluid 13; Shown container body 8 is a closed structure, and it is connected with the outside through gas appearance draft tube 9 gentle kinds of fairleads 12 only, and being provided with in the container body 8 can be to the grit in the gas appearance, harmful gas and other filtered fluid 13 that needs the filtering composition to filter.The quantity of gas appearance draft tube 9 is two or more, and the air intake opening of gas appearance draft tube 9 is connected with pipeline to be detected, and the gas outlet extend into behind the body wall of container body 8 among the filtered fluid 13, so that realize the effective filtration to filtered fluid 13.The air intake opening of gas appearance fairlead 12 is positioned on the liquid level of filtered fluid 13, and the gas outlet is connected with gas appearance pick-up unit accordingly after the body wall of container body 8.
Gas appearance draft tube 9 is provided with flowmeter 10 and flow control valve 11, and flowmeter 10 is realized the indication of flow registration and the adjusting of flow size respectively with flow control valve 11; Through the flow regulation of flow control valve 11, both can realize the uniform sampling of different gas appearance draft tube, can realize that also different gas appearance draft tube by weights control sampling, are more convenient for using.Wherein flowmeter 10 can be structure as a whole with flow control valve 11, can adopt two devices; Flowmeter can adopt the glass tube suspended body flowmeter of glass tube suspended body flowmeter or band flow regulation.The pipe that the employing of gas appearance draft tube is not processed by the material of sample gas corrosion, material can be selected latex, plastics or steel for use, and the diameter of gas appearance draft tube can be chosen between 10~30mm.Container body 8 can adopt the transparent or opaque material that does not receive the corrosion of sample gas, when adopting opaque material, should on container body, install transparent window additional, so that observe the situation of internal tank liquid or sampling.9 gentle kinds of fairleads of gas appearance draft tube are positioned at the part of container body 8, should adopt stereoplasm tube, immerse in the filtered fluid 13 so that guarantee gas appearance draft tube 9, and gas appearance fairlead 12 are positioned at the top position of filtered fluid 13 liquid levels all the time.

Claims (5)

1. a coal-burning boiler air-heater leakage on-Line Monitor Device comprises the air preheater (7), inlet flue duct (5) and the exhaust pass (6) that are arranged on the flue; It is characterized in that: said on-Line Monitor Device comprises two measuring units respectively gas in inlet flue duct and the exhaust pass being analyzed, the oxygen amount meter (3) that said measuring unit includes gas sampling assembly (1), aspiration pump (2) and gas appearance oxygen level measured calculating; The output terminal of gas sampling assembly is connected with the input end of oxygen amount meter through after the suction pump; The input end of two gas sampling assemblies is connected on respectively on inlet flue duct and the exhaust pass, and the output signal of said two oxygen amount meters all is connected with the data acquisition system (DAS) (4) that realizes data processing.
2. coal-burning boiler air-heater leakage on-Line Monitor Device according to claim 1; It is characterized in that: said gas sampling assembly (1) comprises container body (8), at least two gas appearance draft tube (9) and a gas appearance fairlead (12); Be provided with filtered fluid (13) in the container body; The outlet of said gas appearance draft tube extend into below the liquid level of filtered fluid, and the air intake opening of gas appearance fairlead is positioned at the top of filtered fluid liquid level; Also be provided with flowmeter (10) and flow control valve (11) on the said gas appearance draft tube.
3. coal-burning boiler air-heater leakage on-Line Monitor Device according to claim 2 is characterized in that: at least two the gas appearance draft tube (9) on the said sampling apparatus (1) are arranged on the same cross section of inlet flue duct (5) or exhaust pass (6).
4. coal-burning boiler air-heater leakage on-Line Monitor Device according to claim 1 and 2 is characterized in that: said data collector system (4) comprises that the air leak rate of air curtain that is used for calculating carries out the data presented display module.
5. coal-burning boiler air-heater leakage on-Line Monitor Device according to claim 1 and 2 is characterized in that: said oxygen amount meter (3) output terminal is the electrical signal of representative oxygen oxygen amount.
CN201120266411U 2011-07-26 2011-07-26 Coal-fired boiler air preheater air leakage on-line monitoring device CN202141562U (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103323273A (en) * 2013-05-24 2013-09-25 国家电网公司 Method for detecting performance of power station boiler air pre-heater
CN103914063A (en) * 2014-03-31 2014-07-09 华电国际电力股份有限公司技术服务中心 On-line performance diagnostic system and method for rotary air pre-heater
CN103940550A (en) * 2014-04-09 2014-07-23 国家电网公司 Device for measuring air leakage of power station boiler air pre-heater
CN104615898A (en) * 2015-02-12 2015-05-13 中冶华天工程技术有限公司 Method for measuring and calculating air leakage rate of air preheater of multi-fuel combustion CFB (circulating fluid bed) boiler powered by combusting coal and blast-furnace coal gas
CN104880282A (en) * 2015-05-28 2015-09-02 江苏嘉德宏益环保节能科技有限公司 Flue energy transducer protection device
CN105181257A (en) * 2015-08-14 2015-12-23 中国神华能源股份有限公司 Oxygen-rich combustion air leak monitoring method and system
CN105388258A (en) * 2015-12-21 2016-03-09 中国神华能源股份有限公司 Gas pipeline wind leakage apparatus and oxygen-rich combustion system
CN106765030A (en) * 2016-12-16 2017-05-31 华北电力科学研究院有限责任公司 The decision method that supercritical DC opposed firing Boiler Furnace bottom is leaked out
CN108760976A (en) * 2018-04-17 2018-11-06 河南科技大学 It is vented detection method and emission sensing device, exhaust detection case
CN109307573A (en) * 2018-09-26 2019-02-05 国网河北省电力有限公司电力科学研究院 Air leak rate of air preheater test method

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103323273B (en) * 2013-05-24 2016-08-10 国家电网公司 A kind of method detecting power station boiler air pre-heater performance
CN103323273A (en) * 2013-05-24 2013-09-25 国家电网公司 Method for detecting performance of power station boiler air pre-heater
CN103914063A (en) * 2014-03-31 2014-07-09 华电国际电力股份有限公司技术服务中心 On-line performance diagnostic system and method for rotary air pre-heater
CN103940550A (en) * 2014-04-09 2014-07-23 国家电网公司 Device for measuring air leakage of power station boiler air pre-heater
CN104615898A (en) * 2015-02-12 2015-05-13 中冶华天工程技术有限公司 Method for measuring and calculating air leakage rate of air preheater of multi-fuel combustion CFB (circulating fluid bed) boiler powered by combusting coal and blast-furnace coal gas
CN104615898B (en) * 2015-02-12 2017-06-30 中冶华天工程技术有限公司 The method for obtaining coal and blast furnace gas multifuel combustion CFB boiler air leak rate of air preheater
CN104880282A (en) * 2015-05-28 2015-09-02 江苏嘉德宏益环保节能科技有限公司 Flue energy transducer protection device
CN105181257A (en) * 2015-08-14 2015-12-23 中国神华能源股份有限公司 Oxygen-rich combustion air leak monitoring method and system
CN105388258A (en) * 2015-12-21 2016-03-09 中国神华能源股份有限公司 Gas pipeline wind leakage apparatus and oxygen-rich combustion system
CN106765030A (en) * 2016-12-16 2017-05-31 华北电力科学研究院有限责任公司 The decision method that supercritical DC opposed firing Boiler Furnace bottom is leaked out
CN106765030B (en) * 2016-12-16 2019-07-26 华北电力科学研究院有限责任公司 The determination method that supercritical DC opposed firing Boiler Furnace bottom is leaked out
CN108760976A (en) * 2018-04-17 2018-11-06 河南科技大学 It is vented detection method and emission sensing device, exhaust detection case
CN108760976B (en) * 2018-04-17 2021-03-02 河南科技大学 Exhaust gas detection method, exhaust gas detection device, and exhaust gas detection box
CN109307573A (en) * 2018-09-26 2019-02-05 国网河北省电力有限公司电力科学研究院 Air leak rate of air preheater test method

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Effective date of registration: 20130509

Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing

Patentee after: State Grid Corporation of China

Patentee after: Shandong Research Inst. of Electric Power

Address before: 250002 boiler Institute of Shandong Electric Power Research Institute, No. 500 South Second Ring Road, Shizhong District, Shandong, Ji'nan

Patentee before: Shandong Research Inst. of Electric Power

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