Production method for improving productivity of alkaline furnace

Abstract

The invention discloses a production method for improving productivity of an alkaline furnace. The method comprises the following steps: (1) evaporating and concentrating of black liquor, wherein coniferous wood dissolving pulp black liquor is evaporated and concentrated by using I effect, II effect, III effect, IV effect, V effect, VI effect and super-concentration effect, so that the concentration of the treated black liquor is over 72%; (2) air volume and air pressure proportioning, wherein the primary air volume is 40000 Nm<3>/h, the primary air pressure is 1000 pa, the secondary air volume is 45000 Nm<3>/h, the secondary air pressure is 1200 pa, the tertiary air volume is 32000 Nm<3>/h, and the tertiary air pressure is 1800 pa; and (3) jet combustion, wherein black liquor jet combustion is performed by setting the aperture of a black liquor spray gun at 20 mm and setting the jet pressure at 0.08 Mpa. According to the invention, the problem of insufficient productivity of an alkalirecovery system is solved, and through adjustment of the production process, the black liquor treatment capacity is effectively improved, and the alkali yield and the steam yield are increased.

Description

【Technical field】 [0001] The invention relates to the technical field of alkali recovery, in particular to a production method for increasing the production capacity of an alkali furnace. 【Background technique】 [0002] In the kraft (alkali) pulping process, about 40-50% of the organic matter in the fiber raw material is dissolved in the cooking lye to become black liquor. The main components of these inorganic substances are sodium salts combined with organic substances, free NaOH, Na 2 CO 3 、Na 2 S, Na 2 SO 4 etc. Each ton of chemical pulp can produce 10m 3 The black liquor of around 1.2-1.7 tons in solid content is the source of pollution. The purpose of alkali recovery is to convert the sodium salt in the black liquor into NaOH, which is reused for cooking and continuously recycled, so as to reduce the consumption of alkali and reduce the pollution to waters. This is alkali recovery. [0003] The combustion air supply system of the alkali recovery furnace usually...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a production method for improving the production capacity of the alkali furnace, so as to solve the problem of insufficient production capacity of the alkali recovery system. Through the adjustment of the production process, the processing capacity of black liquor can be effectively increased, and the production of alkali and steam can be increased. quantity

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