A kind of oxygen-enhanced combustion method of coal powder mixed with sludge

Abstract

The invention belongs to the technical field of boiler combustion and discloses a pulverized coal and sludge mixed oxygenation combustion method. The pulverized coal and sludge mixed oxygenation combustion method is characterized in that a sludge and pulverized coal mixture is taken as a fuel, pure oxygen is injected into a primary air pipeline and a secondary air pipeline to increase the concentration of oxygen in a hearth and to promote stable and sufficient combustion of the fuel in the hearth, an air separation device provides two paths of pure oxygen, one path of pure oxygen and air are mixed in the primary air pipeline to serve as primary oxygenation air to enter the hearth, and the other path of pure oxygen and air are mixed in the secondary air pipeline to serve as secondary oxygenation air to enter the hearth. The ratio of oxygen in the primary air and the secondary air is adjusted to increase the concentration of oxygen in the hearth, so that the combustion stability is improved, the distribution of temperature during combustion is changed, finally, generation of NOX is reduced, the calorific value ratios of sludge and pulverized coal are increased, the sludge disposal capacity is increased, the heat efficiency and the burn-off rate are increased, and emission of such pollutants as NOX and dioxin is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of boiler combustion, and more specifically relates to an oxygen-increased combustion method. Background technique [0002] With the development of industrial technology and the development and deepening of sewage treatment technology, sludge discharge has gradually increased, which has brought enormous pressure to the ecological environment. At present, the methods of sludge treatment mainly include agricultural use, incineration and sanitary landfill. Because the sludge itself contains polluting components, the treatment methods of agricultural use and landfill will cause great pollution to the environment. Sludge contains a large amount of organic matter and has a high calorific value, which can be used as fuel for power plants to generate electricity. Moreover, sludge incineration not only completely decomposes organic matter, but also recycles the heat energy obtained from incineration to achieve the ...

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Problems solved by technology

Most of the current sludge incineration technologies mix sludge and coal powder into the boiler for incineration, but the combustion of sludge in the air atmosphere tends to cause insufficient combustion of the system, low burnout rate, low temperature in the furnace, and high concentration of di Dioxins, NO X flue gas, the heat utilization rate of the system is low

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