Oxygen-enriched combustion external bed heat exchanger of circulating fluidized bed

Abstract

The invention relates to an oxygen-enriched combustion external bed heat exchanger of a circulating fluidized bed, which introduces coke and a desulfurating agent in a hearth into the heat exchanger for combustion while absorbing separated ash and reducing temperature, simultaneously carries out desulfuration and can improve the heat exchanging effect of the external bed heat exchanger so as to solve the problem of difficult distribution of a heating surface of the circulating fluidized bed oxygen-enriched combustion. The lower part of the external bed heat exchanger (5) is communicated with a dense-phase area (1) of the lower part of the hearth of the circulating fluidized bed by an opening (9), and the upper part thereof is communicated with a transition section (11) of the hearth of the circulating fluidized bed by an opening (7); a dilute-phase area (2) of the circulating fluidized bed is communicated with a gas-solid separator (3); the upper part of the gas-solid separator (3) is connected with the heating surface of the tail part thereof by a central cylinder (4), the lower end thereof is communicated with the external bed heat exchanger (5) by a vertical pipe and a feeding pipe (6) of the external bed heat exchanger, and the lower end of the external bed heat exchanger (5) is connected with an external bed air chamber (8); and the solid particles separated by the gas-solid separator (3) and the solid particles with good fluidization in the hearth enter the external bed heat exchanger (5) for mixed combustion.

Description

technical field [0001] The invention relates to a circulating fluidized bed oxygen-enriched combustion external bed heat exchanger, which belongs to the technical field of energy saving and environmental protection engineering. Background technique [0002] The greenhouse gas CO emitted by fossil fuel combustion 2 The harm to the environment has aroused great concern all over the world. In numerous CO 2 Among the separation and capture technologies, circulating fluidized bed oxygen-enriched combustion technology is a new type of low-cost separation and recovery of CO 2 Compared with the pulverized coal furnace oxygen-enriched combustion technology, the new concept of combustion method with low pollutant emission has attracted the attention of researchers from various countries and has broad application prospects. Due to the increase of oxygen concentration and the decrease of circulating flue gas concentration, the volume of the boiler is correspondingly reduced, especial...

AI Technical Summary

Problems solved by technology

While absorbing the temperature drop of the separated ash, the heat exchanger introduces the coke and desulfurizer in the furnace into the heat exchanger for combustion and desulfurization at the same time, which can strengthen the heat exchange effect of the external bed heat exchanger and effectively solve the problem of circulating fluidized bed Difficult layout of oxy-fuel combustion heating surface

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