Method for producing both gas and steam, and boiler of circulating fluid bed with pyrolysis vaporizer

Abstract

The present invention relates to a gas-steam joint production method and circulating fluidized-bed boiler. It includes the following portions: fluidized-bed combustion chamber, cyclone separator, hot ash distributor, pyrolysis gasification chamber, heat exchanger and differential bed material-retuning device. Said invention also provides its concrete technological process, it can be used as steam boiler, and can implement gas-steam joint production.

Description

technical field [0001] The invention relates to a coal gas-steam co-production method and a circulating fluidized bed boiler with a pyrolysis gasification chamber. technical background [0002] Existing coal-fired boilers and gasifiers can only produce steam and gas alone, while existing gas-steam cogeneration boilers often only guarantee stable gas production. For fluidized bed gas-steam cogeneration equipment, there are two types of gasification chambers commonly used, namely moving bed gasification chamber and bubbling bed gasification chamber. In the moving bed gasification chamber, semi-coke is often returned to the combustion chamber in a self-flowing manner, which cannot control the residence time of the material in the gasification chamber and affects the conversion rate of carbon; while the returning material on a conventional circulating fluidized bed boiler The device is also not suitable here, because the particle size of the semi-coke is much larger than that o...

AI Technical Summary

Problems solved by technology

Part or all of the circulating ash enters the retort, and the amount of ash entering the retort is controlled through the ash volume adjustment door. The mechanical ash volume adjustment door works at high temperature, and the cost, life and reliability are not ideal

The circulating ash and coal are sent to the two inlets on the retort separately, which is not easy to mix evenly in the retort, which reduces the carbon conversion rate

The semi-coke and circulating ash discharged from the retort chamber are sent back to the furnace through pressurized air, which requires a large amount of air and a high speed, which easily causes the combustion of the semi-coke in the conveying pipe, and causes great wear and tear on the conveying pipe.

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