CN104235823A - Novel method for online monitoring flue gas heat load distribution of spiral water wall of supercritical boiler - Google Patents
Novel method for online monitoring flue gas heat load distribution of spiral water wall of supercritical boiler Download PDFInfo
- Publication number
- CN104235823A CN104235823A CN201410541464.3A CN201410541464A CN104235823A CN 104235823 A CN104235823 A CN 104235823A CN 201410541464 A CN201410541464 A CN 201410541464A CN 104235823 A CN104235823 A CN 104235823A
- Authority
- CN
- China
- Prior art keywords
- water
- heat load
- water wall
- wall
- load distribution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention relates to a novel method for online monitoring flue gas heat load distribution of a spiral water wall of a supercritical boiler. A thermal coupler is spot-welded to the away-from-fire side of a key point of a characteristic pipe of the surface of the spiral water wall of the supercritical boiler, temperature signals are collected in real time through a conventional method and transmitted into a computer, and then the added enthalpy of working media between adjacent test points of the same pipe multiplied by the average working medium flow and divided by the radiation area equals to the average heat load between the two points. A heat absorption heat load distribution surface chart of the wall surface of the water wall in the direction of the height of a hearth can be obtained online according to the heat absorption heat load value, obtained in real time through smooth connection, of each pipe of the water wall, and the change situation of the heat absorption heat load of the water wall in the direction of the height of the hearth can be reflected in real time.
Description
Technical field
The present invention relates to a kind of new method of on-line monitoring super critical boiler helical water-cooled wall flue gas heat load distribution.This method is applied to the boiler that overcritical helical water-cooled wall pipeloop is arranged, relates to the fields such as energy source and power.
Background technology
Super critical boiler major part adopts the design of helical water-cooled wall pipeloop, and object is that each water screen tube is heated evenly, and reduces helical water-cooled wall outlet temperature deviation.Super critical boiler combustion system generally adopts the suspension combustion of coal dust, sprays into burner hearth, carry out violent chemical reaction, releases heat, by the water wall absorption of burner hearth surrounding in burner hearth through the pulverized coal particle ground.The temperature of combustion centre can reach more than 1400 DEG C, if combustion centre position is improper or heat load distribution deviation is excessive, high temperature corrosion, slagging scorification, the harm equipment such as flame-out can occurs and jeopardize the hidden danger of safe operation.So the heat load distribution situation of water-cooling wall has important reference significance for firing optimization.Adopt heat-flow meter to stretch in burner hearth in the combustion adjustment test of general boiler to measure the thermic load of this point, but the position carrying out like this measuring is very limited, and also can only be measured in experimental stage by professional, has significant limitation.And on-line monitoring can adopt obtaining by calculating to fiery side and back-fire side reload temperature measuring point at water screen tube, but adopt and be unable to undergo long test to the measuring point of fiery side in this way.
Summary of the invention
The object of the invention is to the deficiency for existing measuring method and mode, there is provided new a set of can the new method of on-line measurement water-cooling wall heat absorption thermic load, can Real-Time Monitoring water-cooling wall along the heat absorption heat load distribution situation of furnace height, to firing optimization, water-cooling wall soot blowing and optimal etc., there is practical value.
Due at boiler under supercritical parameter condition, the enthalpy of water and temperature are one to one, and the outer temperature of the back-fire side pipe of water screen tube is consistent with Temperature of Working substantially.Think the object realizing on-line monitoring thermic load, the present invention is according to the feature of above-mentioned super critical boiler and the general principle of heat transfer and back-fire side measuring point principle easy for installation, helical water-cooled wall pipeloop is selected targetedly some Gents levy and manage sub, at its pipe outer back-fire side, temperature point is installed, calculate average heat absorption thermic load numerical value between two measuring points according to the temperature data of these measuring points by certain computation model, display water-cooling wall is along the dynamic thermal load distribution situation of the heat absorption of height in real time.
Core technology of the present invention is feature according to supercritical boiler water-cooling wall and structure, at the back-fire side of different water-cooling wall pipe key point, thermocouple measuring point is installed, intraductal working medium enthalpy is calculated online by measuring point temperature and power pressure, recept the caloric according to the water-cooling wall that the enthalpy of working medium increases and boiler output situation calculates between adjacent measuring point, the mean heat flux size of this pipeline section can be drawn by the area of heating surface.So, the water-cooled wall of each has the mean heat flux numerical value of 5 ~ 10 different level pipes, just can obtain this face wall along the heat load distribution on height.
Accompanying drawing explanation
Fig. 1 is in a kind of on-line monitoring super critical boiler helical water-cooled wall flue gas heat load distribution new method of the present invention, about the sectional drawing of water-cooling wall measuring point back-fire side installation method.
In Fig. 1,1 is boiler water-wall tube, and 2 fins connected for boiler water-wall tube, 3 for being installed on the thermocouple of water screen tube back-fire side mid point, and 4 is the heat-insulation layer of water-cooling wall.
Fig. 2 is the schematic diagram of water-cooling wall point layout in on-line measurement supercritical boiler water-cooling wall flue gas heat load distribution new method, 5 ~ 10 water screen tubes can be selected according to actual conditions, back-fire side central point near the elbow of every root pipe installs thermocouple, spreads all over whole spirally-wound tubes.
Detailed description of the invention
Below in conjunction with accompanying drawing, technical scheme of the present invention is further described.
A kind of on-line monitoring super critical boiler helical water-cooled wall flue gas heat load distribution new method of the present invention, as shown in Figure 1, is mainly included in the back-fire side central point spot welded hot galvanic couple 3 of water screen tube 1, is tightly wrapped in by thermocouple 3 in water-cooling wall heat-insulation layer 4 also fixing.
Can be known by the heat-transfer character of supercritical boiler water-cooling wall, the tube wall temperature of back-fire side with Temperature of Working substantially close to equal, the value recorded according to above-mentioned the thermocouple 3 and enthalpy of working medium can be drawn with the pressure of working medium; Select the pipe that 5 ~ 10 root distances are identical, the back-fire side of every root pipe near the elbow of water-cooling wall corner installs thermocouple, be the caloric receptivity of this point-to-point transmission working medium with the average discharge that the enthalpy difference of adjacent 2 of same pipe is multiplied by working medium, the area divided by the radiation heating-surface of this point-to-point transmission just can obtain the mean heat flux of this point-to-point transmission.The water-cooled wall of each there are 5 ~ 10 pipes that can calculate mean heat flux.So just can by the characteristic of this face of 5 ~ 10 mean heat flux data representations water-cooled wall along the heat load distribution of height.
Water-cooling wall installs temperature point according to the method for Fig. 1 at the back-fire side of these feature pipe key points, so just can obtain the thermic load that these water-cooling wall nodes absorb heat online, these values demonstrate the size of different water-cooling wall heat absorption loads along with the impact such as furnace load, water-cooling wall dust stratification, these heat absorption thermic load values put are being carried out mathematical method process along furnace height direction, just can depict a wall-cooling surface heat absorption heat load distribution surface chart by computation graph technology, reflect the situation of change that water-cooling wall absorbs heat.Important Data support is provided for situations such as the high temperature corrosion on firing optimization and wall-cooling surface, dust stratification, slagging scorification.
Claims (3)
1. a new method for on-line measurement super critical boiler helical water-cooled wall flue gas heat load distribution, is characterized in that arranging temperature point with a definite target in view at the key point back-fire side of super critical boiler helical water-cooled wall feature pipe---water screen tube (1) back-fire side central point spot welded hot galvanic couple (3).
2. by each water screen tube each key point thermocouple (3) temperature signal by Data acquisition and transmit to special computer, by the software for calculation customized just can according to the enthalpy difference of consecutive points working medium and on average working medium flow product amass the mean heat flux obtaining pipe between consecutive points divided by radiation heating-surface.
3. the water-cooling wall node that on-line real time monitoring obtains absorbs heat thermic load numerical value, obtains the heat absorption heat load distribution surface chart of water-cooling wall wall along height through mathematical method process, can reflect the situation of change of water-cooling wall heat absorption load in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410541464.3A CN104235823A (en) | 2014-10-14 | 2014-10-14 | Novel method for online monitoring flue gas heat load distribution of spiral water wall of supercritical boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410541464.3A CN104235823A (en) | 2014-10-14 | 2014-10-14 | Novel method for online monitoring flue gas heat load distribution of spiral water wall of supercritical boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104235823A true CN104235823A (en) | 2014-12-24 |
Family
ID=52224423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410541464.3A Pending CN104235823A (en) | 2014-10-14 | 2014-10-14 | Novel method for online monitoring flue gas heat load distribution of spiral water wall of supercritical boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104235823A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764545A (en) * | 2015-02-04 | 2015-07-08 | 上海交通大学 | Real-time estimation method for dynamic absorbed heat quantity of ultra-supercritical thermal power generating unit evaporation system |
| CN105202523A (en) * | 2015-10-28 | 2015-12-30 | 贵州电网有限责任公司电力科学研究院 | Method for calculating W flame supercritical power station boiler sewage cooling wall flue gas thermal load distribution online |
| CN105698156A (en) * | 2016-02-01 | 2016-06-22 | 上海发电设备成套设计研究院 | Online monitoring method and system for wall temperature of vertical water wall of ultra-supercritical boiler |
| CN108105749A (en) * | 2017-11-30 | 2018-06-01 | 湖南省湘电试验研究院有限公司 | Working medium flow On-line Measuring Method and system in a kind of water screen tube |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11337007A (en) * | 1998-05-27 | 1999-12-10 | Takuma Co Ltd | Method and apparatus for detecting overheating of boiling body |
| JP2004163061A (en) * | 2002-11-15 | 2004-06-10 | Mitsubishi Heavy Ind Ltd | Heat load measuring method of boiler furnace wall and boiler |
| CN101398370A (en) * | 2008-10-31 | 2009-04-01 | 江苏方天电力技术有限公司 | High temperature corrosion on-line monitoring system for boiler water-cooled wall |
| CN102494325A (en) * | 2011-12-19 | 2012-06-13 | 上海望特能源科技有限公司 | Method for monitoring intra-furnace dynamic wall temperature in high-temperature tube system of power station boiler |
| CN102494323A (en) * | 2011-12-19 | 2012-06-13 | 上海望特能源科技有限公司 | Method for distributing external wall temperature measuring acquisition points of high-temperature piping system of power station boiler |
| CN102539009A (en) * | 2012-01-06 | 2012-07-04 | 华北电力大学 | System for monitoring fire facing side wall temperature of water cooled wall of power station boiler on line, and monitoring method |
| CN104061563A (en) * | 2013-12-23 | 2014-09-24 | 国家电网公司 | Water-cooled wall metal temperature online-measurement method and device for (ultra)-supercritical boiler |
-
2014
- 2014-10-14 CN CN201410541464.3A patent/CN104235823A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11337007A (en) * | 1998-05-27 | 1999-12-10 | Takuma Co Ltd | Method and apparatus for detecting overheating of boiling body |
| JP2004163061A (en) * | 2002-11-15 | 2004-06-10 | Mitsubishi Heavy Ind Ltd | Heat load measuring method of boiler furnace wall and boiler |
| CN101398370A (en) * | 2008-10-31 | 2009-04-01 | 江苏方天电力技术有限公司 | High temperature corrosion on-line monitoring system for boiler water-cooled wall |
| CN102494325A (en) * | 2011-12-19 | 2012-06-13 | 上海望特能源科技有限公司 | Method for monitoring intra-furnace dynamic wall temperature in high-temperature tube system of power station boiler |
| CN102494323A (en) * | 2011-12-19 | 2012-06-13 | 上海望特能源科技有限公司 | Method for distributing external wall temperature measuring acquisition points of high-temperature piping system of power station boiler |
| CN102539009A (en) * | 2012-01-06 | 2012-07-04 | 华北电力大学 | System for monitoring fire facing side wall temperature of water cooled wall of power station boiler on line, and monitoring method |
| CN104061563A (en) * | 2013-12-23 | 2014-09-24 | 国家电网公司 | Water-cooled wall metal temperature online-measurement method and device for (ultra)-supercritical boiler |
Non-Patent Citations (1)
| Title |
|---|
| 杨勇: "1000MW超超临界压力直流锅炉螺旋管圈水冷壁的水动力及传热特性试验研究", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764545A (en) * | 2015-02-04 | 2015-07-08 | 上海交通大学 | Real-time estimation method for dynamic absorbed heat quantity of ultra-supercritical thermal power generating unit evaporation system |
| CN104764545B (en) * | 2015-02-04 | 2017-08-01 | 上海交通大学 | A kind of ultra supercritical coal-fired unit vapo(u)rization system dynamic caloric receptivity real-time estimation method |
| CN105202523A (en) * | 2015-10-28 | 2015-12-30 | 贵州电网有限责任公司电力科学研究院 | Method for calculating W flame supercritical power station boiler sewage cooling wall flue gas thermal load distribution online |
| CN105698156A (en) * | 2016-02-01 | 2016-06-22 | 上海发电设备成套设计研究院 | Online monitoring method and system for wall temperature of vertical water wall of ultra-supercritical boiler |
| CN105698156B (en) * | 2016-02-01 | 2017-11-14 | 上海发电设备成套设计研究院 | A kind of ultra-supercritical boiler vertical water wall wall temperature on-line monitoring method and system |
| CN108105749A (en) * | 2017-11-30 | 2018-06-01 | 湖南省湘电试验研究院有限公司 | Working medium flow On-line Measuring Method and system in a kind of water screen tube |
| CN108105749B (en) * | 2017-11-30 | 2019-09-13 | 湖南省湘电试验研究院有限公司 | Working medium flow On-line Measuring Method and system in a kind of water screen tube |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Fan et al. | Numerical investigation on heat transfer of supercritical carbon dioxide in a vertical tube under circumferentially non-uniform heating | |
| CN103672846B (en) | Method for monitoring wall temperature of heating surface and thickness of scale cinder of boiler superheater or reheater | |
| Díez et al. | Modelling of pulverized coal boilers: review and validation of on-line simulation techniques | |
| Modliński et al. | Mathematical procedure for predicting tube metal temperature in the second stage reheater of the operating flexibly steam boiler | |
| CN103216812B (en) | Method for on-line monitoring and alarming of convection heating face flue gas temperature field of power station boiler | |
| CN104235823A (en) | Novel method for online monitoring flue gas heat load distribution of spiral water wall of supercritical boiler | |
| Madejski et al. | Numerical model of a steam superheater with a complex shape of the tube cross section using Control Volume based Finite Element Method | |
| Qi et al. | Numerical simulation of the heat transfer of superheater tubes in power plants considering oxide scale | |
| Shu et al. | Development of a distributed-parameter model for the evaporation system in a supercritical W-shaped boiler | |
| CN105202523A (en) | Method for calculating W flame supercritical power station boiler sewage cooling wall flue gas thermal load distribution online | |
| Xu et al. | The finite volume method for evaluating the wall temperature profiles of the superheater and reheater tubes in power plant | |
| CN102494323B (en) | Method for distributing external wall temperature measuring acquisition points of high-temperature piping system of power station boiler | |
| Wang et al. | Coupled convection heat transfer of water in a double pipe heat exchanger at supercritical pressures: An experimental research | |
| Rahmani et al. | Numerical investigation of heat transfer in 4-pass fire-tube boiler | |
| CN216160037U (en) | On-line measuring device for temperature of boiler water-cooling wall of thermal generator set | |
| CN102313277A (en) | Method for carrying out real-time furnace monitoring for pulverized-coal boiler-superheater reheater | |
| Zheng et al. | Distributed parameters modeling for evaporation system in a once-through coal-fired twin-furnace boiler | |
| Ge et al. | Unsteady-state heat transfer characteristics of spiral water wall tube in advanced-ultra-supercritical boilers from experiments and distributed parameter model | |
| Qi et al. | Numerical simulation and optimization of heat-insulation material and structure for CFB boiler | |
| Wang et al. | Heat transfer and frictional resistance characteristics of the water wall tube of an ultra-supercritical CFB boiler | |
| CN202216928U (en) | Fouling monitoring device for monitoring convection heating surfaces f boiler | |
| CN116735021A (en) | Structure for measuring wall temperature of steam pipeline of boiler and installation method | |
| CN115681945A (en) | Online monitoring method for temperature of fire-facing side wall of supercritical carbon dioxide boiler hearth | |
| Khazhidinova et al. | Influence of contamination of low-temperature heating surfaces of boiler on the intensity of convective heat exchange during the burning of non-design fuel | |
| CN105572168A (en) | Thermal type steam dryness meter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20141224 |