EP2461098A2 - Chaudière à grille mécanique et procédé de modernisation d'une chaudière à grille mécanique - Google Patents

Chaudière à grille mécanique et procédé de modernisation d'une chaudière à grille mécanique Download PDF

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Publication number
EP2461098A2
EP2461098A2 EP12157001A EP12157001A EP2461098A2 EP 2461098 A2 EP2461098 A2 EP 2461098A2 EP 12157001 A EP12157001 A EP 12157001A EP 12157001 A EP12157001 A EP 12157001A EP 2461098 A2 EP2461098 A2 EP 2461098A2
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EP
European Patent Office
Prior art keywords
stoker
air channel
wind boxes
under
space
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.)
Withdrawn
Application number
EP12157001A
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German (de)
English (en)
Other versions
EP2461098A3 (fr
Inventor
Witold Kowalewski
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Individual
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Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP2461098A2 publication Critical patent/EP2461098A2/fr
Publication of EP2461098A3 publication Critical patent/EP2461098A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23H—GRATES; CLEANING OR RAKING GRATES
    • F23H11/00—Travelling-grates
    • F23H11/10—Travelling-grates with special provision for supply of air from below and for controlling air supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B1/00—Combustion apparatus using only lump fuel
    • F23B1/16—Combustion apparatus using only lump fuel the combustion apparatus being modified according to the form of grate or other fuel support
    • F23B1/22—Combustion apparatus using only lump fuel the combustion apparatus being modified according to the form of grate or other fuel support using travelling grate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B30/00—Combustion apparatus with driven means for agitating the burning fuel; Combustion apparatus with driven means for advancing the burning fuel through the combustion chamber
    • F23B30/02—Combustion apparatus with driven means for agitating the burning fuel; Combustion apparatus with driven means for advancing the burning fuel through the combustion chamber with movable, e.g. vibratable, fuel-supporting surfaces; with fuel-supporting surfaces that have movable parts
    • F23B30/06—Combustion apparatus with driven means for agitating the burning fuel; Combustion apparatus with driven means for advancing the burning fuel through the combustion chamber with movable, e.g. vibratable, fuel-supporting surfaces; with fuel-supporting surfaces that have movable parts with fuel-supporting surfaces that are specially adapted for advancing the fuel through the combustion zone
    • F23B30/08—Combustion apparatus with driven means for agitating the burning fuel; Combustion apparatus with driven means for advancing the burning fuel through the combustion chamber with movable, e.g. vibratable, fuel-supporting surfaces; with fuel-supporting surfaces that have movable parts with fuel-supporting surfaces that are specially adapted for advancing the fuel through the combustion zone with fuel-supporting surfaces that move through the combustion zone, e.g. with chain grates

Definitions

  • the subject of the invention is a stoker-fired boiler containing in the combustion zone a movable stoker and an under-stoker wind boxes system, and a method of modernization of such a boiler.
  • the purpose of the invention was to reduce uncontrolled flows of air streams within a stoker-fired boiler, negatively affecting its performance.
  • a boiler according to the invention contains an combustion chamber with a secondary air channel, a movable mechanical stoker, an under-stoker space containing an under-stoker wind boxes system with wind boxes, as well as a main channel supplying the air from the atmosphere to the inside of the wind boxes.
  • the boiler contains also an additional air channel with an inbuilt fan with adjustable output. First end of this additional air channel is connected with the under-stoker space located outside of the wind boxes of the under-stoker wind boxes system. Second end of the additional air channel is connected with the atmosphere.
  • the boiler in another embodiment, it contains temperature sensors in the space of the main channel and in the space of the additional air channel. These sensors are connected to controller of the inbuilt fan.
  • a method of modernization according to the invention consists in that in the aforementioned boiler second end of the additional air channel is connected with the atmosphere.
  • thermo sensors in the space of the main channel and in the space of the additional air channel are located temperature sensors. These sensors are connected to the controller of the inbuilt fan.
  • the invention reduces the amount of air coming through the gaps and combining with the combustion fumes, giving in consequence a reduced coefficient of excess air in the fumes. This results in a reduction of a physical loss in the fumes, which also means the increase of boiler performance, usually by about 2 to 5%, depending on its technical condition, changes of the load, quality of the combustion charge, and proper maintenance and operation.
  • the application of the invention also reduces the consumption of electric power by the components of the boiler by approximately 10-20%.
  • the load of the extractor fan is smaller, and the consumption of energy by the fan of the additional air channel is balanced by limited energy consumption by the wind boxes air fan.
  • a beneficial feature of the invention is also a short time needed for the modernization of the boiler, and a low cost of such modernization that amounts to ca. 10% of the cost of replacement of the under-stoker wind boxes system.
  • fig.1 presents schematic vertical cross sections of a stoker-fired boiler according to the invention.
  • a typical stoker-fired boiler has a fume zone with a fume extractor fan 1, and a burner zone.
  • a burner zone In the burner zone there is an combustion chamber 2, a movable mechanical stoker 3, an under-stoker wind boxes system 4 with wind boxes 5, and a channel 6 supplying the air from the atmosphere to the inside of the wind boxes 5 by means of a wind boxes air fan 7.
  • the combustion chamber 2 has a secondary air channel powered by a fan 8.
  • the boiler according to the invention has an additional air channel 9 with an inbuilt fan 10 with adjustable output. First end 9' of the additional air channel 9 is connected with the under-stoker space 11 located outside of the wind boxes 5 of the under-stoker wind boxes system 4. The second end 9" of the additional air channel 9 is connected with the atmosphere.
  • Output of the fan 10 may be controlled manually, whereas it is beneficial to use for this purpose the knowledge of air temperature in the space of channel 6 supplying it from the atmosphere to the inside of the wind boxes 5, and temperature of the air in the space of the additional air channel 9. In order to do so, in these places at least one air temperature sensor (not shown in the drawings) should be placed.
  • the difference between the temperature of wind boxes air stream in the channel 6, and temperature of air stream in the additional air channel 9 not exceeding 5°C shows that through channel 9 flows only the air coming from uncontrolled leakages to the under-stoker space.
  • the difference in temperatures amounting to 5 to 10°C constitutes information that in the additional air channel 9 there also is the air deriving from uncontrolled leakages taking place through the section of the stoker 3 on which the combustion process no longer takes place or takes place into a limited extent. In this case, uncontrolled leakages take place towards the bottom part of the combustion chamber 2, and their reception has positive effects on the physical loss in the fumes.
  • the difference in temperature exceeding 10°C constitutes information that into the channel 9 additionally flow some of the fumes from the combustion chamber 2 without resulting in a physical loss in the fumes.
  • These dependencies allow for automation of the adjustment of output of the fan 10, through connecting of the said temperature sensors to the fan controller, and the application of the difference between the temperatures measured by means of these sensors as a control parameter. It unexpectedly appeared that with small loads of the boiler, amounting to for instance 10-20% of the nominal load, the amount of air coming from the gaps is sufficient to conduct the process of combustion. In such a situation, when there is no possibility to isolate the channel 6 from the atmosphere, the wind boxes air fan 7 stops supplying air for the combustion process and only starts to block the out-flow of air from the boiler.
  • Connecting of the first wind box separated from the stream of wind boxes air with the under-stoker space allows boiler operators to control the distance of the point of coal ignition on the stoker from the slide gate and the front part of the boiler structure. Similarly, connecting of the last non-operating wind boxes with the under-stoker space after prior separation from the stream of wind boxes air reduces uncontrolled leakages from the wind boxes space to the combustion chamber.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Air Supply (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Incineration Of Waste (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
EP12157001.4A 2007-12-03 2008-12-01 Chaudière à grille mécanique et procédé de modernisation d'une chaudière à grille mécanique Withdrawn EP2461098A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PL383941A PL383941A1 (pl) 2007-12-03 2007-12-03 Kocioł rusztowy, sposób modernizacji kotła rusztowego oraz sposób likwidowania szkodliwych przedmuchów powietrza, nie biorącego udziału w procesie spalania w kotle rusztowym
EP08858195A EP2217858B1 (fr) 2007-12-03 2008-12-01 Procédé d'élimination de fuites incontrôlées d'air ne prenant pas part au processus de combustion dans une chaudière à grille mécanique

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP08858195.4 Division 2008-12-01
EP08858195A Division EP2217858B1 (fr) 2007-12-03 2008-12-01 Procédé d'élimination de fuites incontrôlées d'air ne prenant pas part au processus de combustion dans une chaudière à grille mécanique

Publications (2)

Publication Number Publication Date
EP2461098A2 true EP2461098A2 (fr) 2012-06-06
EP2461098A3 EP2461098A3 (fr) 2014-08-27

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP12157001.4A Withdrawn EP2461098A3 (fr) 2007-12-03 2008-12-01 Chaudière à grille mécanique et procédé de modernisation d'une chaudière à grille mécanique
EP08858195A Active EP2217858B1 (fr) 2007-12-03 2008-12-01 Procédé d'élimination de fuites incontrôlées d'air ne prenant pas part au processus de combustion dans une chaudière à grille mécanique

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP08858195A Active EP2217858B1 (fr) 2007-12-03 2008-12-01 Procédé d'élimination de fuites incontrôlées d'air ne prenant pas part au processus de combustion dans une chaudière à grille mécanique

Country Status (10)

Country Link
US (1) US20100307393A1 (fr)
EP (2) EP2461098A3 (fr)
CN (1) CN101896771A (fr)
AT (1) ATE552463T1 (fr)
AU (1) AU2008332014A1 (fr)
CA (1) CA2705730A1 (fr)
PL (2) PL383941A1 (fr)
RU (1) RU2447371C2 (fr)
UA (1) UA94868C2 (fr)
WO (1) WO2009072909A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010052404A1 (de) * 2010-11-24 2012-05-24 Clyde Bergemann Drycon Gmbh Verfahren und Vorrichtung zur Steuerung einer Verbrennung in einem Verbrennungskessel
CN104930697A (zh) * 2014-03-18 2015-09-23 凤城市百利锅炉制造有限公司 一种卧式锅炉
CN107448970A (zh) * 2017-08-14 2017-12-08 山东天力节能环保工程有限公司 锅炉房
CN113803738B (zh) * 2021-09-30 2024-04-26 鄂尔多斯市昊华国泰化工有限公司 一种内置风口循环结构的低氮燃烧锅炉及方法

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EP0498014A1 (fr) 1991-02-07 1992-08-12 MARTIN GmbH für Umwelt- und Energietechnik Procédé pour l'admission d'air de combustion et installation de chauffage

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Also Published As

Publication number Publication date
UA94868C2 (ru) 2011-06-10
RU2447371C2 (ru) 2012-04-10
EP2217858B1 (fr) 2012-04-04
RU2010126547A (ru) 2012-01-10
US20100307393A1 (en) 2010-12-09
AU2008332014A1 (en) 2009-06-11
WO2009072909A3 (fr) 2009-08-06
WO2009072909A2 (fr) 2009-06-11
PL383941A1 (pl) 2009-06-08
WO2009072909A4 (fr) 2009-10-15
CA2705730A1 (fr) 2009-06-11
EP2217858A2 (fr) 2010-08-18
ATE552463T1 (de) 2012-04-15
EP2461098A3 (fr) 2014-08-27
CN101896771A (zh) 2010-11-24
PL2217858T3 (pl) 2012-09-28

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