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Higher efficiency extraction and cooling system for heavy ash flows

A high-flow, heavy-ash technology, used in lighting and heating equipment, etc., can solve the problem of poor efficiency of electrostatic separators, and achieve the effect of effective preheating

Inactive Publication Date: 2011-12-07
MAGALDI IND SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This situation worsens the efficiency of the electrostatic separator due to the increased entry velocity and mainly due to the increased resistance of the ash

Method used

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  • Higher efficiency extraction and cooling system for heavy ash flows
  • Higher efficiency extraction and cooling system for heavy ash flows
  • Higher efficiency extraction and cooling system for heavy ash flows

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Embodiment Construction

[0045] Referring to the above figures, an apparatus for extracting and cooling combustion residues, of the type used eg in thermal power plants of solid fossil fuels and according to a preferred embodiment of the present invention, is generally designated with reference numeral 1 . As will be better understood in the description below, the plant 1 is particularly suitable for handling high flows of heavy ash, eg resulting from the combustion of high ash content coal or lignite.

[0046] For greater clarity, the different parts of the plant 1 will be described below with reference to the path followed from the extraction of combustion residues from the bottom of the combustion chamber (or boiler) 100 until the residues are to be disposed of.

[0047] Downstream of the combustion chamber 100 , or better its transition funnel 105 , the plant 1 provides a first extraction and / or transport unit, in particular a dry extractor 9 mainly made of high thermal resistance steel. Said extr...

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Abstract

The present invention relates to a method for the extraction and energy recovery of high flow heavy ash produced by solid fuel boilers, capable of lowering the final temperature of the extracted ash without increasing the air flow into the boiler flue tube, which is usually determined by the boiler designer Set at a value of about 1.5% of the total combustion air. When the air flow required for cooling exceeds the maximum value allowed to enter the boiler, the system is able to send excess air and possibly steam to the air intake duct, thus entering the air / Flue gas exchanger. The environmental separation of the cooling system is automatically handled according to the temperature signal in the ash for discharge from the system. If the cooling air is not enough to cool the ash, the cooling efficiency can be improved by adding atomized water.

Description

technical field [0001] The invention relates to a device and a method for extracting, cooling and recovering the heat energy of heavy ash with a large flow rate produced by a solid fuel boiler. Background technique [0002] The continuing increase in demand for solid fossil fuels for power generation is also leading to the burning of high-ash coal and lignite with increasing frequency. Combustion of lignite in high-power boilers produces extremely large quantities of heavy ash, even up to 100 t / h, which often contain a high percentage of unburned matter. Dry cooling, or mainly dry cooling, of such large quantities of heavy ash requires extremely large amounts of cooling air, even more than double or triple that of fossil fuels with their high heat release. [0003] As explained in EP 0 471 055 B1, in certain known ash extraction and dry cooling plants, cooling air, once heated by heat exchange with the ash, is introduced into the boiler from the bottom of the boiler. There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23J1/02
CPCF23J2900/01003F23J2900/01002F23J2700/001F23J1/02
Inventor M·马迦迪R·索兰缇
Owner MAGALDI IND SRL
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