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Method and apparatus for optimizing combustion conditions in a fluidized bed boiler

A fluidized bed boiler and conditional technology, applied in the direction of fluidized bed combustion equipment, fluidized bed furnace, combustion method, etc., can solve the problems of rising, promoting the formation of agglomerates, and unfavorable emissions, so as to reduce NOx emissions and reduce The effect of afterburn risk

Active Publication Date: 2015-07-29
VALMET POWER OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the oxygen content of the secondary gas is also raised to provide complete combustion, a temperature peak is created at the secondary level which is bad for emissions and promotes lump formation

Method used

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  • Method and apparatus for optimizing combustion conditions in a fluidized bed boiler
  • Method and apparatus for optimizing combustion conditions in a fluidized bed boiler
  • Method and apparatus for optimizing combustion conditions in a fluidized bed boiler

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Embodiment Construction

[0032] figure 1 The circulating fluidized bed boiler 10 shown in includes: a furnace 11, in which the fuel is combusted in the circulating fluidized bed; a cyclone separator 12, in which the fluidized material is separated from the flue gas; and a return channel 13, in which the fluidized material It is circulated back to the furnace 11 via it. Fuel 14 is supplied to the furnace 11 , as is oxygen-containing fluidized combustion gas in the form of a primary gas stream 15 and a secondary gas stream 16 . Combustion takes place in a fluidized bed which is fluidized and circulated by a primary gas stream 15 supplied from below.

[0033] A fluidized bed comprises a solid inert bed material (usually sand), fuel supplied thereto, fuel ash, possibly limestone, combustion gases, and flue gases produced in the combustion. The gas flows 15 , 16 are set so large that a portion of the fluidized material leaves from the upper part of the furnace 11 to the cyclone 12 together with the flue ga...

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Abstract

A method and an arrangement for optimizing combustion conditions in a fluidized-bed boiler, in which combustion gas is fed at two or more height levels, the first of which is a primary level (P) which is located at the height of a furnace bottom and the second is a secondary level (S) which is located above fuel feed height (F), above which secondary level (S) there can be still other combustion gas feed levels (T, . . . ). At least one combustion gas feed level (P, S, T, . . . ) is fed at different points of the furnace (11) in its horizontal direction with combustion gases having different oxygen contents such that zones of different oxygen content can be formed in the horizontal direction of the furnace (11).

Description

technical field [0001] The invention relates to a method for optimizing combustion conditions in a fluidized bed boiler, wherein oxygen-containing combustion gas is fed at more than two height levels, the first being a primary level at the height of the furnace bottom, the second The secondary level is a secondary level positioned close to the fuel supply level above which still other combustion gas supply levels can exist. The invention also relates to a device for implementing an equivalent method. Background technique [0002] Concerns about climate change have led to the search for new means to reduce global warming carbon dioxide emissions from energy production. One means proposed to reduce greenhouse gas emissions is oxy-fuel combustion. When fuel is combusted with air in a conventional manner, the flue gas contains a large amount of nitrogen from the air. Recovery of carbon dioxide from this flue gas is expensive and technically difficult. When the combustion air...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C10/18F23L7/00
CPCF23L7/007F23L9/02F23N2037/26F23L9/04Y02E20/322F23N2037/18Y02E20/344F23C10/28F23C10/10F23C6/045F23L2900/07007F23C10/20F23C2201/101F23L2900/07001F23N2237/18F23N2237/26Y02E20/34F27B15/10Y02E20/32
Inventor M·瓦罗宁T·卢奥马哈尔约
Owner VALMET POWER OY