Novel circulating fluidized bed boiler

A circulating fluidized bed and boiler technology, which is applied in the directions of fluidized bed combustion equipment, combustion type, and fuel burned in a molten state, can solve the problems of high ash content, low utilization rate of coal gangue, low calorific value, etc. Conducive to burnout and good heat and mass exchange

Inactive Publication Date: 2012-12-12
湖南乾能新能源科技开发有限公司
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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.

Method used

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Embodiment 1

[0014] Example 1: A circulating fluidized bed boiler for the transformation of a XF-SI type circulating fluidized bed boiler purely burning coal gangue such as figure 2 As shown, it includes a furnace 1, a tail shaft 2, a circulation channel 3, a steaming heating surface 4, a water wall 5 and an air distribution plate.

[0015] Remove the water wall in furnace 1, such as figure 1 As shown, other structures remain unchanged.

[0016] The furnace does not arrange a water-cooled wall 5 heating surface in the furnace 1 . After the coal gangue is sent into the furnace 1, charcoal is used to ignite. Since there is no water-cooled wall 5 to absorb heat, the heat released by the coal gangue combustion is used to raise the temperature of the furnace body, flue gas and ash, and continuously heats the coal gangue that is subsequently put into the furnace. The temperature of the furnace 1 can be raised to 950-1000°C, so that the coal gangue with high ash content, high moisture content...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/18
Inventor 伍尉恒骆大军
Owner 湖南乾能新能源科技开发有限公司
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