Novel circulating fluidized bed boiler

Abstract

The invention relates to a novel circulating fluidized bed boiler. The novel circulating fluidized bed boiler comprises a hearth, a cyclone separator, a steaming heating surface, a tail shaft well, a flue gas outlet, an air distributor and a deslagging pipe. The steaming heating surface is mainly installed on an outer part of the hearth. A water cooling wall is not used in the hearth. The novel circulating fluidized bed boiler reduces a heating area in a fluidized bed zone, forms a high-temperature zone needed by combustion, increases a heating area in other zones, realizes full combustion of coal gangue or high-quality coal having a calorific value above 850 kilocalories per kilogram, and produces enough heat.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler. Background technique [0002] Fluidized bed is a new type of combustion equipment developed in recent decades. It uses fluidized combustion technology to generate steam, high-temperature flue gas and high-temperature air. It can be widely used in power generation, paper making, building materials, chemical industry, smelting and other industries. At present, in the process of coal mining and washing in our country, a large amount of coal gangue is produced every year, of which less than 15% of the coal gangue is used as fuel, and the rest of the coal gangue is mostly discarded. The reason why the utilization rate of coal gangue is low is that coal gangue is an inferior fuel with low calorific value and high ash content. Now there are many studies on how to make full use of coal gangue fuel to realize heat exchange. Currently, circulating fluidized bed is used Boilers can solve this problem ...

AI Technical Summary

Problems solved by technology

The reason why the utilization rate of coal gangue is low is that coal gangue is an inferior fuel with low calorific value and high ash content. Now there are many studies on how to make full use of coal gangue fuel to realize heat exchange. Currently, circulating fluidized bed is used Boilers can solve this problem very well, but for coal gangue with too low calorific value, such as coal gangue below 1500 kcal / kg, there are still many problems in using ordinary circulating fluidized bed boilers

There are also some scholars who have developed a circulating fluidized bed boiler device that purely uses coal gangue with low calorific value, but it can only adapt to coal gangue above 1,000 kcal / kg, and is helpless for coal gangue below 1,000 kcal / kg.

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