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System for optimum SCR operation for controlling exhaust temp of flue

A technology of gas temperature and flue, which is applied in the direction of flue gas purification components, steam boiler components, separation methods, etc., can solve the problems of serious changes in gas flow and temperature, etc.

Inactive Publication Date: 2003-10-08
THE BABCOCK & WILCOX CO
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Problems solved by technology

[0006] The present invention achieves the optimum inlet temperature for catalytic reactor gas mixing more easily by providing a water flow recirculation system for boilers in which gas flow and temperature variations at the economizer output are less severe than those using a flue gas bypass system requirements, addressing the related and other problems associated with current technical installations

Method used

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  • System for optimum SCR operation for controlling exhaust temp of flue
  • System for optimum SCR operation for controlling exhaust temp of flue
  • System for optimum SCR operation for controlling exhaust temp of flue

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Embodiment Construction

[0014] Referring to Figures 1 and 2, the present invention uses different methods to obtain the TPP boiler exhaust temperature. In normal boiler applications, one side of the economizer's water flow is used to cool the flue gas flowing over surfaces mounted inside the boiler. Here, the boiler recirculation system (10) is modified to get a near-saturated higher temperature water flow input to the inlet (16) of the economizer (18) from the downcomer (12) connected by the bypass pipe (14). This inlet (16) is a T-shaped inlet with the other input of the T providing the normal feed water flow from the line (20). The water flow through the pipeline (14) is provided by the pump (22) being monitored, and flow F and pressure P sensors are installed on both sides of the pump (22). Economizer (18) bypass line (24) is provided as shown in dotted line in Figure 1 to allow the downpipe ( 12) Saturated water is recirculated from the cylinder (26) back to the bypass pipe (24).

[0015] spe...

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Abstract

A system for maintaining an optimal flue gas inlet to a boiler mounted SCR assembly in the flue of the boiler is accomplished by mixing the normal inlet feedwater to an economizer of the boiler with near saturation water from downcomers of the boiler to thereby raise the temperature of the flue gas passing across the economizer and raising the SCR inlet to the desired optimal SCR operation temperature.

Description

(1) Technical field [0001] The present invention generally relates to boilers using an SCR (Selective Catalyst Reduction) system at the flue exhaust to scavenge flue gas in that vicinity, and in particular to optimum temperature operation of such boilers. (2) Background technology [0002] When operating with a selective catalyst reduction system (or SCR) at the flue flue gas exhaust, the activity of the catalyst depends on the temperature of the flue gas entering the catalytic reactor. A given catalyst performs best when it is operated at its optimum performance temperature (TPP). For example, in eliminating NO X In a typical SCR, NO is present in the flue gas X The temperature for best performance of the ammonia reaction (typically 650°F) is optimized and the amount of ammonia required for the catalytic reaction is minimized. Therefore, for economical reasons, the desired gas temperature entering the catalytic reactor should be maintained at TPP at all loads. Also, mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B37/00
CPCF22B37/008
Inventor M·J·阿尔布雷克特J·B·罗根
Owner THE BABCOCK & WILCOX CO
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