CN110878938A - Circulating fluidized bed combustor system cooled by primary hot air - Google Patents

Circulating fluidized bed combustor system cooled by primary hot air Download PDF

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Publication number
CN110878938A
CN110878938A CN201911079445.2A CN201911079445A CN110878938A CN 110878938 A CN110878938 A CN 110878938A CN 201911079445 A CN201911079445 A CN 201911079445A CN 110878938 A CN110878938 A CN 110878938A
Authority
CN
China
Prior art keywords
air
cooling air
fluidized bed
oil
boiler
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
Application number
CN201911079445.2A
Other languages
Chinese (zh)
Inventor
齐国滨
王万波
陈文双
张超
刘傲翔
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Northern Huajin Formosan Union Chemical Corp
Original Assignee
Northern Huajin Formosan Union Chemical Corp
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 Northern Huajin Formosan Union Chemical Corp filed Critical Northern Huajin Formosan Union Chemical Corp
Priority to CN201911079445.2A priority Critical patent/CN110878938A/en
Publication of CN110878938A publication Critical patent/CN110878938A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/18—Details; Accessories
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/36—Details, e.g. burner cooling means, noise reduction means
    • F23D11/38—Nozzles; Cleaning devices therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L1/00—Passages or apertures for delivering primary air for combustion 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L13/00—Construction of valves or dampers for controlling air supply or draught

Abstract

The invention belongs to the technical field of circulating fluidized bed combustors, and particularly relates to a circulating fluidized bed combustor system adopting primary hot air cooling. The system comprises a plurality of oil burners, a main combustion cooling air duct and cooling air branch ducts of the oil burners; the main combustion cooling air duct is led out from a primary hot air main pipe connected to a boiler air chamber, and primary hot air passes through the main combustion cooling air duct and then respectively enters the corresponding oil burners through a plurality of oil burner cooling air branch air ducts. The invention has simple, compact and reasonable structure, optimizes the air distribution system of the circulating fluidized bed boiler, effectively reduces the temperature deviation of exhaust smoke, reduces the power consumption of the secondary fan during the start of the boiler, accelerates the ignition speed, saves fuel and reduces the start cost of the boiler.

Description

Circulating fluidized bed combustor system cooled by primary hot air
Technical Field
The invention belongs to the technical field of circulating fluidized bed combustors, and particularly relates to a circulating fluidized bed combustor system adopting primary hot air cooling.
Background
Circulating fluidized bed boilers have been rapidly developed in China due to their characteristics of wide fuel adaptability, strong load adjustability, excellent environmental protection performance, and the like. More than 4000 circulating fluidized bed boilers with different capacities exist in China, and more than 1000GW is put into commercial operation.
At present, a circulating fluidized bed boiler mainly adopts two pneumatic ignition modes, namely, ignition by an oil gun on a bed and ignition by an air duct burner under the bed. The ignition of the oil gun on the bed is realized by arranging the ignition oil gun in a dense-phase region of a hearth above an air distribution plate, heating bed materials through the oil gun on the bed to finish ignition, firstly making the bed materials in a fluidized state during ignition, spraying flame into a material layer from a proper position above the bed materials, and gradually heating and raising the temperature of the material layer under the actions of high-temperature flame baking and radiation to finally reach the coal feeding temperature. The ignition of the under-bed air duct burner is to arrange an ignition air duct in front of an air chamber at the lower part of a hearth, arrange an oil gun in the ignition air duct, burn the oil gun to generate high-temperature flue gas, mix the high-temperature flue gas with primary air for fluidization, then pass through an air distribution plate to heat bed materials, and the high-temperature flue gas and the bed materials are subjected to strong gas-solid heat transfer at intervals, so that the heat of the ignition burner can be effectively transferred to the bed materials.
The primary and secondary air ratio of the original circulating fluidized bed boiler is 60:40, and the primary and secondary air ratio of the new circulating fluidized bed boiler is 50:50 according to the requirements of ultralow-emission low-nitrogen combustion and boiler wear reduction. Due to the adjustment of air distribution amount, the original arrangement of the air preheater can not meet the air distribution requirement.
No matter the ignition mode of an oil gun on a bed or an air duct combustor under the bed is adopted, the cooling air of the combustor usually adopts a secondary hot air cooling mode, and one path of secondary hot air led out from a secondary hot air main pipe of an air preheater is fed into combustion to serve as combustion air during starting ignition and cooling air during normal operation. Therefore, the secondary air fan needs to be started earlier at the time of starting.
Under the existing arrangement form of cooling air of a boiler burner, the proportion of primary air and secondary air distribution when boiler abrasion resistance and low-nitrogen combustion are considered in the actual operation of a common circulating fluidized bed boiler is reduced compared with the original design value of the boiler, so that the exhaust gas temperature deviation of two sides of an outlet of an air preheater is large, the exhaust gas temperature deviation of individual working conditions exceeds 30 ℃, and the safe and economic operation of the boiler is influenced. The primary hot air is used as cooling air of the circulating fluidized bed boiler burner, so that the flue gas exhaust temperature deviation, particularly the flue gas temperature deviation of the boiler at low load, can be effectively reduced.
Disclosure of Invention
Technical problem to be solved
The invention provides a circulating fluidized bed combustor system adopting primary hot air cooling, which aims to solve the technical problem of reducing the use amount of secondary hot air.
(II) technical scheme
In order to solve the technical problems, the invention provides a circulating fluidized bed combustor system adopting primary hot air cooling, which comprises a plurality of oil combustors, a main combustion cooling air channel and branch cooling air channels of the oil combustors; the main combustion cooling air duct is led out from a primary hot air main pipe connected to a boiler air chamber, and primary hot air passes through the main combustion cooling air duct and then respectively enters the corresponding oil burners through a plurality of oil burner cooling air branch air ducts.
Furthermore, an electric air door and an air gauge are sequentially arranged between the cooling air branch duct of the oil burner and the oil burner.
Further, a main pipe air gauge is arranged in the main air duct of the cooling air of the combustor.
Further, the total air volume of the cooling air for the combustor is not less than 20000Nm3In the case of/h, the diameter of the total air duct of the cooling air of the combustor should not be less than 500 mm.
(III) advantageous effects
The invention provides a circulating fluidized bed combustor system adopting primary hot air cooling, which comprises a plurality of oil combustors, a main combustion cooling air duct and cooling air branch ducts of the oil combustors; the main combustion cooling air duct is led out from a primary hot air main pipe connected to a boiler air chamber, and primary hot air passes through the main combustion cooling air duct and then respectively enters the corresponding oil burners through a plurality of oil burner cooling air branch air ducts.
The invention has simple, compact and reasonable structure, optimizes the air distribution system of the circulating fluidized bed boiler, effectively reduces the temperature deviation of exhaust smoke, reduces the power consumption of the secondary fan during the start of the boiler, accelerates the ignition speed, saves fuel and reduces the start cost of the boiler.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be given in conjunction with examples.
The present embodiment provides a circulating fluidized bed combustor system using primary hot air cooling, which mainly includes an oil combustor, a main combustion cooling air duct, and cooling air branch ducts of the oil combustors.
The main combustion cooling air duct is led out from a main primary hot air duct connected to a boiler air chamber, and primary hot air passes through the main combustion cooling air duct, then passes through a plurality of oil burner cooling air branch air ducts, sequentially passes through an electric air door, an air gauge and other equipment, and then respectively enters four oil burners respectively provided with two left and right sides.
The primary hot air entering the oil burner is used as combustion air of fuel oil when the furnace is started and ignited, and is used as cooling air of a burner of the oil burner when the furnace is in normal operation.
In this embodiment, the diameter of the total air duct of the cooling air for the burner is determined according to the total air volume of the cooling air for the burner, which is not less than 20000Nm3In the case of/h, the diameter of the total air duct of the cooling air of the combustor should not be less than 500 mm. The larger the capacity of the circulating fluidized bed boiler is, the thicker the total air duct of the burner cooling air is, and the more the number of the burner cooling air branch pipes is.
In the embodiment, a main pipe air gauge is arranged in a main air duct of the cooling air of the combustor; and a branch air gauge is arranged in each oil burner cooling air branch air channel. In addition, an electric air door is arranged in each oil burner cooling air branch air channel so as to facilitate various conditions such as air quantity adjustment, switching during maintenance and the like.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (4)

1. A circulating fluidized bed combustor system adopting primary hot air cooling is characterized by comprising a plurality of oil combustors, a main combustion cooling air duct and cooling air branch ducts of the oil combustors; the main combustion cooling air duct is led out from a primary hot air main pipe connected to a boiler air chamber, and primary hot air passes through the main combustion cooling air duct and then respectively enters the corresponding oil burners through a plurality of oil burner cooling air branch air ducts.
2. The burner system of claim 1, wherein an electric damper and an air gauge are sequentially disposed between the oil burner cooling air branch duct and the oil burner.
3. The burner system of claim 1, wherein a main duct of burner cooling air has a main duct air gauge.
4. The burner system of claim 1, wherein a total air volume for the burner cooling air is not less than 20000Nm3In the case of/h, the diameter of the total air duct of the cooling air of the combustor should not be less than 500 mm.
CN201911079445.2A 2019-11-07 2019-11-07 Circulating fluidized bed combustor system cooled by primary hot air Pending CN110878938A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911079445.2A CN110878938A (en) 2019-11-07 2019-11-07 Circulating fluidized bed combustor system cooled by primary hot air

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911079445.2A CN110878938A (en) 2019-11-07 2019-11-07 Circulating fluidized bed combustor system cooled by primary hot air

Publications (1)

Publication Number Publication Date
CN110878938A true CN110878938A (en) 2020-03-13

Family

ID=69729128

Family Applications (1)

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CN201911079445.2A Pending CN110878938A (en) 2019-11-07 2019-11-07 Circulating fluidized bed combustor system cooled by primary hot air

Country Status (1)

Country Link
CN (1) CN110878938A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202938289U (en) * 2012-10-15 2013-05-15 徐州燃控科技股份有限公司 Fuel-saving ignition device of circulating fluidized bed boiler
CN103438443A (en) * 2013-09-10 2013-12-11 鞍山锅炉厂有限公司 Device with annular cold air low-heat-storage quick start ignition and combustion system
CN103644564A (en) * 2013-11-26 2014-03-19 中国华能集团清洁能源技术研究院有限公司 Temperature-adjustable and resistance-adjustable fluidized wind system of circulating fluidized bed boiler
CN104566353A (en) * 2014-12-20 2015-04-29 无锡东马锅炉有限公司 Primary air blowing device for circulating fluidized bed boiler

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202938289U (en) * 2012-10-15 2013-05-15 徐州燃控科技股份有限公司 Fuel-saving ignition device of circulating fluidized bed boiler
CN103438443A (en) * 2013-09-10 2013-12-11 鞍山锅炉厂有限公司 Device with annular cold air low-heat-storage quick start ignition and combustion system
CN103644564A (en) * 2013-11-26 2014-03-19 中国华能集团清洁能源技术研究院有限公司 Temperature-adjustable and resistance-adjustable fluidized wind system of circulating fluidized bed boiler
CN104566353A (en) * 2014-12-20 2015-04-29 无锡东马锅炉有限公司 Primary air blowing device for circulating fluidized bed boiler

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Application publication date: 20200313