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Determining the reduction rate of a recovery boiler

A recovery boiler, chemical technology, applied in fiber raw material processing, adjusting fuel supply, radiation pyrometry, etc., can solve the problems of inability to highlight combustion differences in the combustion chamber, slowness, measurement delay, etc., to reduce pollution and danger. Melt surge, improved chemical circulation, improved steam generation

Pending Publication Date: 2021-12-17
ANDRITZ AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Even if the analysis of green liquor is realized by online measurement, there will inevitably be a delay in measurement due to the mixing and slow change of the contents of the dissolution tank
In addition, the analysis of green liquor produces an average value of the content of the melt stream from different melt spouts, i.e. it cannot highlight combustion differences in different parts of the combustion chamber

Method used

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  • Determining the reduction rate of a recovery boiler
  • Determining the reduction rate of a recovery boiler
  • Determining the reduction rate of a recovery boiler

Examples

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Embodiment Construction

[0044] The following is a detailed description of embodiments of the invention, examples of which are depicted in the accompanying drawings. The following detailed description, together with the figures, is intended to describe examples, not to represent the only ways to implement or employ the provided examples. The example activities and series of phases / actions are highlighted below to allow the examples to be assembled and used. However, the same or equivalent activities and stages / operations can be achieved through other examples as well.

[0045] As an example, figure 1 Components of a system 100 according to the invention are described in which different embodiments of the invention can be implemented. figure 1 The example in presents: recovery boiler 110; sampler 120; device 130 for generating a digital frame from a chemical melt sample taken in recovery boiler 110 using sampler 120; computer equipment 200 for determining from the taken sample recovery boiler reduct...

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Abstract

The invention enables determining the reduction rate of a recovery boiler using optical information from a chemical smelt sample. A processor is used to read a digital frame at least part of which represents the chemical smelt sample of the recovery boiler. An area of interest is determined from the digital frame read comprising at least part of the area in the digital frame representing the chemical smelt sample. Of the pixel values of the area of interest, one or more spectral characteristic values correlating with the change of reduction rate are determined. The reduction rate of the recovery boiler is determined using a reduction rate function of one or more of the determined spectral characteristic values weighted at predetermined weights.

Description

technical field [0001] The invention has application in determining the reduction rate of a recovery boiler using optical information from a sample of a chemical melt. Background technique [0002] In principle, recovery boilers have two main functions, chemical recovery and recovery of the heat of combustion generated in the process as steam and thermal energy. The chemical melt flowing from the bottom of the recovery boiler furnace through the melt spout contains sodium sulfide, sodium carbonate and sodium sulfate. Key to the efficiency with which the recovery boiler performs chemical recovery is the reduction rate, which indicates the amount of sodium sulfate that is reduced to sodium sulfide. The reduction rate, also called reduction hereinafter, is determined as a percentage. For example, the measured reduction is used to control the fuel feed to the recovery boiler and the amount of combustion air at different levels in order to optimize combustion. Reduction is mea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C7/12G01N21/25G01J3/46G01N21/31G01N21/17
CPCG01N21/251G01N21/31G01N2021/1776G01N2201/129G01N2201/1296D21C7/12G01J3/50G01J2003/466D21C11/12F23N5/08G01J5/60G01N21/00G01N21/25G01N21/255G01N33/343D21C11/10F23N1/042F23N5/082G01N21/27
Inventor 海基·拉帕莱宁朱和·努尔米萨利·里萨宁埃萨·维哈维宁
Owner ANDRITZ AG
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