Fume condensed-water flue-dust conveyance system of supercharged oxygen-enriched coal-fired boiler

Abstract

The invention discloses a fume condensed-water flue-dust conveyance system of a supercharged oxygen-enriched coal-fired boiler. The fume condensed-water flue-dust conveyance system comprises a high-pressure condensed-water recovery part, a coal ash injection part and a main ash conveyance pipe. The high-pressure condensed-water recovery part consists of a supercharged combustion hearth, a dust remover and a condenser. The coal ash injection part consists of an ash leakage bucket, a mill exhauster and a coal ash injector. The main ash conveyance pipe consists of an ash conveyance pipeline, a first regulating valve, a fourth regulating valve and a manometer, and the high-pressure condensed-water recovery part and the coal ash injection part are connected through the main ash conveyance pipe. According to the fume condensed-water flue-dust conveyance system disclosed by the invention, the coal ash is conveyed to an ash yard by utilizing the condensed water with power capacity in the fumeof the supercharged oxygen-enriched coal-fired boiler, the alkalinity of the coal ash is neutralized by utilizing the acidity of the fume condensed water so that the pipe is prevented from being scaled, and the purposes of water and energy conservation and convenience for maintenance are realized.

Description

technical field [0001] The invention relates to an ash conveying system for recovering flue gas moisture from the discharge of a pressurized oxygen-enriched coal-fired boiler and using high-pressure condensed water to transport coal ash to an ash yard, belonging to the technical field of combustion equipment. Background technique [0002] Coal for thermal power generation contains about 7% to 10% water. The main components of coal combustion products are carbon dioxide and water, and the air required for combustion also brings a certain amount of water. Normally, the water vapor content in the flue gas produced by burning 1kg of coal is between 0.3kg and 0.6kg. The power plant adopts pressurized oxygen-enriched coal-fired boiler equipment, so that the whole process of combustion can be completed under the pressure of about 6.0-8.0MPa. More than 80% of the water vapor in the flue gas can be condensed and has a pressure of more than 6.0Mpa, which has a strong working ability,...

AI Technical Summary

Problems solved by technology

The existing ash conveying system uses the boosted circulating water to convey the coal ash to the ash field. Since the ash conveying system requires the ratio of ash to water to be between 1:5 and 1:6, the ash conveying water pressure should reach 1.5 Mpa, so the existing ash conveying system has the defects of large water consumption and power consumption

At the same time, because coal ash is alkaline and easy to scale, more manpower and material resources are required for pipeline maintenance

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