Circulating fluidized bed gasification device and method for cooperatively treating waste liquid

Abstract

The invention discloses a circulating fluidized bed gasification device and method for cooperatively treating waste liquid. The circulating fluidized bed gasification device comprises a gasification furnace, and the gasification furnace is provided with a first waste liquid and auxiliary gasification agent inlet unit and a second waste liquid and auxiliary gasification agent inlet unit; and the first waste liquid and auxiliary gasification agent inlet unit and the second waste liquid and auxiliary gasification agent inlet unit are arranged at different height positions of the gasification furnace. The invention discloses the circulating fluidized bed gasification method and device for cooperatively treating the waste liquid. The waste liquid is directly introduced into the circulating fluidized bed gasification furnace, so that the waste liquid treatment process is simplified, the equipment investment is low, the waste liquid treatment cost and difficulty are reduced, and a problem ofpoor slurrying property of a multi-component slurry gasification technology and a technical problem of complex burner structure and short service life of the multi-component slurry gasification technology are solved.

Description

technical field [0001] The invention relates to the technical field of fuel gasification, in particular to a circulating fluidized bed gasification device and method for co-processing waste liquid. Background technique [0002] The organic waste liquid and waste water produced by the chemical industry, the waste water and tar produced by the coking industry, and the organic waste liquid and waste water produced by the pharmaceutical industry, etc., usually have toxic and harmful, unpleasant smell and high chroma due to the presence of various pollutants. , Difficult to biodegrade and other characteristics, the current waste liquid treatment methods mainly include physical methods, chemical methods, physical and chemical methods, and biological methods, etc., but these methods usually have problems such as high energy consumption, high treatment costs, and secondary pollution The risk is a difficult problem in waste liquid treatment at home and abroad. [0003] The multi-com...

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Problems solved by technology

However, the multi-component slurry gasification technology has the following problems: (1) Poor slurry formation, affected by factors such as coal type, coal ash composition, coal powder particle size, additives, organic waste liquid and wastewater characteristics, the concentration of coal slurry is generally between About 60%; (2) The burner structure is complex, the service life is short, and there are serious corrosion and wear phenomena. Generally, it needs to be replaced every three to six months, which seriously affects the operation economy; (3) The coal type has limited adaptability, Restricted by factors such as coal ash, moisture, and reactivity; (4) The cost of pulverization is high, and the coal-water slurry gasification technology uses coal powder as raw material, requiring more than 75% of the coal powder particle size to be less than 200 mesh. Increase the cost of gas production; (5) In order to increase the gasification temperature, pure oxygen is often used as the oxidant, resulting in high oxygen consumption, high temperature of the discharged gas, and large loss of sensible heat, which affects the economy

In view of the above problems, the prior art attempts to improve the slurryability by adding additives (such as dispersants, stabilizers, pH regulators, wetting agents, emulsifiers), but cannot fundamentally solve the problem of coal-water slurry gasification technology. The problem

[0004] At present, the existing multi-component slurry gasification technology has problems such as high cost of pulverization, poor slurry formation, short burner life, and poor adaptability to coal types.

Although multi-component slurry gasification technology can use water, organic waste liquid and waste water as the mobile phase, the slurrying property is poor. Even if additives are added, the coal slurry concentration can only be about 60%, which affects the economy

[0005] At present, the existing circulating fluidized bed coal gasification technology uses water vapor and air / enriched oxygen / pure oxygen as the gasification agent. There are strict requirements, and waste water cannot be directly fed into it; moreover, in order to avoid overheating of the circulating fluidized bed gasifier, it is usually necessary to feed in excess water vapor to control the temperature of the gasifier, which not only causes waste water discharge, but also increases the Carbon dioxide content, coal gasification efficiency decreases

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