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Method for adding coal water slurry into thick black liquor for mixed combustion in alkali recovery furnace

A technology of mixed combustion and coal-water slurry, which is applied in the direction of pulping waste liquid combustion, etc., can solve the problems of insufficient concentrated black liquor, the inability of the alkali recovery furnace to exert its maximum efficiency, and the concentration of concentrated black liquor that cannot meet the requirements, so as to achieve increased The effect of burning volume

Pending Publication Date: 2021-02-02
FUJIAN QINGSHAN PAPER INDUSTRY CO LTD
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  • Abstract
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Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of method that the alkali recovery furnace utilizes high-concentration coal-water slurry to add in the concentrated black liquor to carry out mixed combustion, to solve the problem that the concentration of concentrated black liquor does not meet the requirements or the amount of concentrated black liquor is insufficient. The problem of not being able to perform at its best

Method used

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  • Method for adding coal water slurry into thick black liquor for mixed combustion in alkali recovery furnace
  • Method for adding coal water slurry into thick black liquor for mixed combustion in alkali recovery furnace
  • Method for adding coal water slurry into thick black liquor for mixed combustion in alkali recovery furnace

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Embodiment 1

[0015] Because the black liquor has been super-concentrated, the concentration of the black liquor can generally reach the requirement of more than 60%. This invention mainly solves the problem that the black liquor is insufficient and the load of the alkali furnace cannot meet the requirements. Therefore, the coal water slurry and the thick black liquor are mixed in the alkali furnace burn in. The test results are as follows: During the test period, the total amount of coal-water slurry added: 292.48 tons, with an average concentration of 62.25%, a total of 14 vehicles, with an average of 20.89 tons per vehicle.

[0016] Table 1 CWS test data collection form

[0017]

[0018]

[0019] According to the data in Table 1, the content of coal water slurry entering the furnace is as low as 5.72% and as high as 25.07%.

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Abstract

The invention discloses a method for adding coal water slurry into thick black liquor for mixed combustion in an alkali recovery furnace. The method comprises the following steps: fully mixing the coal water slurry with the thick black liquor, and sending a mixture into the alkali recovery furnace for combustion. By mixing coal water slurry (60-75%) with different concentrations in the thick blackliquor, the concentration of the black liquor can be adjusted, the combustion amount of the alkaline furnace can be increased, the problem that the concentration of the thick black liquor is low or the supply amount of the black liquor in the alkaline furnace is insufficient is solved in production, and a new process for stable combustion of the alkaline furnace is realized.

Description

technical field [0001] The invention relates to a method for mixing and burning an alkali recovery furnace by adding coal water slurry to thick black liquor. Background technique [0002] Alkali recovery is the process of evaporating and concentrating the pulping black liquor to a concentration of more than 60%, then burning it through the alkali recovery furnace to recover chemicals and heat energy, and then use it for pulping production. The alkali recovery furnace mixes the concentrated black liquor and supplemented Glauber's salt into the recovery furnace for combustion to complete the chemical reaction of alkali recovery, and is also a power boiler for steam production. The jet furnace consists of two parts: a fixed vertical furnace and a boiler. The middle and upper part of the fixed furnace acts as a combustion chamber, and the bottom acts as a furnace. The boiler is composed of slag tube, superheater, convection tube, economizer and other components, and the four w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/12
CPCD21C11/12
Inventor 程欣林思球张道江李素娟
Owner FUJIAN QINGSHAN PAPER INDUSTRY CO LTD
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