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Boiler equipped with a superheater

A superheater and boiler technology, applied in steam boilers, steam superheating, fluidized bed boilers, etc., can solve impractical problems

Inactive Publication Date: 2011-11-16
VALMET POWER OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The methods presented above to eliminate superheater corrosion problems are often not practical, especially where a separate supply for additional material or a separate gas supply must be provided to protect the superheater from the harmful effects of flue gases

Method used

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  • Boiler equipped with a superheater
  • Boiler equipped with a superheater
  • Boiler equipped with a superheater

Examples

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Embodiment Construction

[0034] In the figures, elements with corresponding functions are indicated with the same reference numerals.

[0035] figure 1 An example of a steam boiler employing the chamber and superheater configuration described above is shown. Due to the location of the steam boiler and the configuration of the chamber and the superheater, boilers based on fluidized bed combustion, especially bubbling fluidized bed boilers (BFB), can be used, such as figure 1 Shown, or circulating fluidized bed boiler (circulating fluidized bed boiler, CFB), such as Figure 5 shown. In a bubbling fluidized bed boiler, a fluidized bed is created by a gas flow. The application location can also be an alkali recovery boiler, which is Image 6 is shown in and is based on black liquor combustion, or a boiler where the fuel is fired on the grate, or another type of steam boiler.

[0036] figure 1 Shown is a boiler 1 , which in this example is a bubbling fluidized bed boiler, comprising a furnace 2 . Th...

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PUM

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Abstract

The invention relates to a boiler equipped with a superheater. The boiler (1) comprising at least: a furnace (2), in whose lower part the combustion used as the primary source of thermal energy of the boiler is configured to take place; devices (6) for supplying fuel into the furnace; devices (3, 7, 8, 26) for supplying combustion air into the furnace; one or more flue gas ducts (11); at least one chamber (17) accommodating at least one steam superheater (15) for recovering thermal energy. Said chamber is configured to allow a direct line of sight (16) between said superheater and said primary source, to enable the reception of thermal energy by means of thermal radiation. Said chamber is further configured to prevent the entry of said flue gases (19) to said superheater either totally or almost totally, to avoid the reception of thermal energy by convection.

Description

technical field [0001] The present invention relates to boilers for generating and recovering thermal energy. Background technique [0002] In the boiler, large quantities of compounds are formed which damage the material of the heat exchanger surfaces of the boiler. In particular, when burning biofuels and refuse fuels, corrosion of heat exchanger surfaces of boilers, especially of superheaters and their heat exchange surfaces, was detected. Furthermore, it was detected that ash was generated during the combustion of deposits on the heat exchanger surfaces, which reduced heat transfer and thus thermal energy recovery. [0003] The aforementioned biofuels include natural plant materials such as wood chips, bark, agricultural biomass, sawdust, black liquor, and the like. Refuse fuel includes, for example, sorted household waste, industrial and commercial waste, and demolition wood. This garbage includes large amounts of chlorine. Together with sodium and potassium release...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B31/08F22B37/00
CPCF22G1/02F22G1/06F22B31/0007D21C11/12F23L7/00
Inventor A·兰特K·马克拉K·贾斯克莱南
Owner VALMET POWER OY
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