Coal water slurry oxygen-rich combustion system

Abstract

The invention discloses a coal water slurry oxygen-rich combustion system. The coal water slurry oxygen-rich combustion system comprises a hearth, a combustor, a slurry supply system, an oxygen supply system, a flue gas circulation system and a flue gas discharging and recovering system; the slurry supply system comprises a slurry storage tank, a slurry conveying pump, a stirring filter and a slurry supply pump; the oxygen supply system comprises an air separation device compressor and an oxygen tank; the flue gas circulation system comprises a flue gas heat exchanger, a deduster, a circulation fan and a condenser; and the flue gas discharging and recovering system comprises a CO2 compression and storage device and a chimney. Coal water slurry exchanges heat with high temperature flue gas, so the initial temperature is improved, and the ignition heat is reduced; and pure oxygen jet combustion is used in the igniting stage to reduce the igniting temperature of the coal water slurry and rapidly improve the combustion rate of the coal water slurry, and an oxygen-rich combustion technology is combined to solve the problems of difficult ignition, low combustion efficiency, high discharge of NOx and high CO2 capture cost of present coal water slurry boilers.

Description

technical field [0001] The invention belongs to the technical field of coal water slurry combustion, and more specifically relates to an oxygen-enriched combustion system of coal water slurry. Background technique [0002] Coal water slurry is a fuel composed of 60-70% coal powder, 30-40% water and a small amount of chemical additives. Compared with solid coal, coal-water slurry not only maintains the original physical characteristics of coal, but also has the same fluidity and stability as liquid fuel. Combustion of coal water slurry produces a large amount of greenhouse gas CO 2 And higher concentration of nitrogen oxides NOx, which brings great environmental problems, so the development of CO 2 The coal water slurry combustion technology with capture and low NOx emission functions is very necessary. [0003] Oxygen-enriched combustion is a promising large-scale CO2 technology in coal-fired boiler power generation technology. 2 One of the emission reduction technologie...

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Problems solved by technology

[0005] Aiming at the above problems or improvement needs of the prior art, the present invention provides an oxygen-enriched combustion system for coal-water slurry. By exchanging heat between the coal-water slurry and high-temperature flue gas, the initial temperature is increased and the heat of ignition is reduced; pure oxygen The jet reduces the ignition temperature of the coal-water slurry and rapidly increases the combustion rate of the coal-water slurry. Combined with the oxygen-enriched combustion technology that replaces air with pure oxygen and part of the circulating flue gas for combustion, it solves the difficulty in igniting the current coal-water slurry boiler. , low combustion efficiency, high NOx emissions, CO 2 Capture high cost issues

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