Methods of utilizing boiler blowdown for reducing NOX

a technology of boiler blowdown and nox, which is applied in the direction of water feed control, combustion types, furnaces, etc., can solve the problems of increasing the cost of boiler operation and lowering the boiler efficiency

Inactive Publication Date: 2002-10-31
JOHN ZINK CO LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This usage of process steam lowers the efficiency of the boiler or requires additional make-up water which increases the cost of operating the boiler.

Method used

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  • Methods of utilizing boiler blowdown for reducing NOX
  • Methods of utilizing boiler blowdown for reducing NOX
  • Methods of utilizing boiler blowdown for reducing NOX

Examples

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Embodiment Construction

[0015] As mentioned above, steam boilers fired by fluid fuel and combustion air burners have included steam drums from which produced steam and blowdown steam are withdrawn. The blowdown steam withdrawn from the steam drum is required to maintain an appropriate dissolved solids content in the boiler water whereby adverse scale formation does not result. The blowdown steam is either vented to the atmosphere or used for preheating the boiler make-up water with the remaining steam being vented to the atmosphere. Typically, the substantially wasted blowdown steam comprises from about 1.5 to about 5% of the total steam produced by the steam boiler.

[0016] In accordance with the present invention, the heretofore wasted blowdown steam is at least partially utilized for reducing the NO.sub.x emissions produced by the boiler. That is, the blowdown steam is combined with the boiler fluid fuel and / or the combustion air and / or injected into the flame produced by the burner and / or injected into t...

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Abstract

The present invention provides improved methods of reducing NOx emissions in the flue gases produced by a steam boiler fired by a fluid fuel and combustion air burner and including a steam drum provided with make-up water from which produced steam and blowdown steam are withdrawn. In accordance with the invention at least a portion of the blowdown steam is combined with the fluid fuel or combustion air or both.

Description

[0001] 1. Field of the Invention[0002] This invention relates to improved methods of reducing NO.sub.x emissions produced by a steam boiler fired by a fluid fuel and combustion air burner.[0003] 2. Description of the Prior Art[0004] Packaged unit and other steam boilers which are fired by fluid fuel and combustion air burners are commonly used in chemical and other process installations. Such boilers include a steam drum which is provided with feed water and from which produced steam is withdrawn. In order to maintain the appropriate total dissolved solids in the boiler water and avoid scale formation, blowdown steam is withdrawn from the steam drum. The blowdown steam flow depends on the feed water quality and typically amounts to in the range of from about 1.5 to about 5% of the total steam produced by the boiler. The blowdown steam is released to the atmosphere or used to preheat the feed water and then released to the atmosphere.[0005] In order to reduce the NO.sub.x emissions p...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F23C9/08F23L7/00
CPCF23C9/08F23L7/005F23C2202/10
Inventor GUARCO, JOHN P.BARRIEAU, ANDREW S.TSIRULNIKOV, LEV M.
Owner JOHN ZINK CO LLC
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