Micro negative pressure black liquor gasifier

Abstract

The invention discloses a micro-negative-pressure black liquor gasifier. A main body is represented as a dual-crown cover cylindrical body which is covered by a steel shell (3), wherein a supporting drum (1) is connected to a lower crown cover of the cylindrical body; a black liquor atomizing spray gun base (4), an oxygen inlet (5) and a preheated gas inlet (6) are arranged on an upper crown cover; a gasified gas and alkali melt outlet (2) is formed on the side face of the lower part of the cylindrical body, and an anti-explosion device (7) is arranged on the side face of the upper part of the cylindrical body; a liner of the steel shell (3) is a heat insulating layer (8); a carbon depositing plane (9) is constructed in an inner cavity of the black liquor gasifier through an alkali resistant and high-temperature resistant material; a carbon depositing plane support (10) is arranged below the carbon depositing plane (9); the entire inner cavity is divided into a replenishing reaction chamber (11) and a gasifying chamber (12). By mounting the carbon depositing plane on the gasifier, a contact area between coke and water vapor is increased and contact time between a carbon layer and high-temperature water vapor is prolonged, so that the black liquor is more thorough in a gasifying reaction, and yields of CO and H2 are improved.

Description

technical field [0001] The invention belongs to the technical field of pulping and papermaking, and relates to a black liquor treatment device generated in the pulping process, in particular to a micro-negative pressure black liquor gasifier. Background technique [0002] The black liquor produced in the pulping process contains a large amount of biomass, and its total calorific value is about 13.4kJ / g-15.6kJ / g, which is an available resource. The traditional treatment method of black liquor is to burn the evaporated and concentrated black liquor in an alkali recovery furnace, and then use or dispose of various products obtained from the combustion. The pollution of this treatment method is serious, and the recovery rate of heat energy is also low. Black liquor gasification technology is a new type of technology, which converts black liquor into CO and H through a series of chemical reactions under high temperature conditions. 2 Combustible mixed gas as the main active ing...

AI Technical Summary

Problems solved by technology

For the pressurized reaction system, the gasifier needs to have a pressure-resistant function. When there are occasional gas leaks and poor feeding, it needs to be shut down as a whole, which seriously affects the production efficiency, and the gasifier needs to be reheated. And cause a lot of fuel consumption, increase production costs

There are also cases of air leakage and poor feeding in the normal pressure gasification method

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