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Fluidized bed boiler using combustion of coal gangues

A technology for fluidized bed boilers and coal gangue, which is applied in fluidized bed combustion equipment, burning fuel in a molten state, steam boilers, etc., can solve the problems of high ash content, low calorific value, low utilization rate of coal gangue, etc., and achieve thermal quality The effect of good exchange and full combustion

Active Publication Date: 2013-03-06
深圳火焰能节能生态环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Fluidized bed boiler using combustion of coal gangues
  • Fluidized bed boiler using combustion of coal gangues
  • Fluidized bed boiler using combustion of coal gangues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: An XF-SⅠ type circulating fluidized bed boiler for burning coal gangue

[0024] Circulating fluidized bed boiler for modification such as figure 2 As shown, it includes the furnace 1, the tail shaft 2, the circulation channel 3, the steaming heating surface 4, the water wall 5 and the air distribution plate.

[0025] First install the cyclone hood 7 in the furnace 1, such as image 3 As shown, the cyclone hood 7 we use has holes on the side wall of the hood 7 to form an air flow channel, such as Figure 4 As shown, the orthographic projection of the airflow channel opening on the outer wall of the cyclone hood 7 does not coincide with the orthographic projection of the opening on the inner wall of the cyclone hood 7, and the deviation direction and angle are the same.

[0026] Secondly, remove the water wall in the furnace 1, such as figure 1 Shown.

[0027] After the coal gangue is fed into the furnace 1, it is ignited by charcoal, and a swirl flow is generated in ...

Embodiment 2

[0030] Using the circulating fluidized bed boiler in the above example 1, put in coal gangue with a calorific value of about 1000 kcal / kg, and retain part of the water wall in the furnace. The area of ​​the water wall is 0.5 square meters per ton of steam. Increase the convection heat transfer surface, use wood to ignite it to burn, and measure the temperature of the furnace to be 900-950 degrees. If a saturation temperature of 194 degrees and 1.27 Mpa steam is required, 1 ton of coal gangue can produce 1,000 kilograms of qualified weight steam.

Embodiment 3

[0032] Using the circulating fluidized bed boiler in the above example 1, put coal gangue with a calorific value of about 900 kcal / kg, and retain part of the water wall in the furnace. The area of ​​the water wall is 0.3 square meters per ton of steam. Increase the convective heat transfer surface, and use wood ignition to make it burn. The temperature of the furnace is measured to be 900-950 degrees. If a saturation temperature of 194 degrees and 1.27 MPa steam is required, 1 ton of coal gangue can produce 850 kg of qualified weight Steam.

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Abstract

The invention relates to a fluidized bed boiler using the combustion of coal gangues, which comprises a boiler-front coal bucket, a coal feeder, a lower coal pipe, a water-cooled wall, a vaporizing heated surface, an exhaust gas outlet, an air distribution plate, a tail shaft and a deslagging pipe, wherein the position of an air inlet at the bottom of the boiler is provided with a cyclonic air cap, and the vaporizing heated surface is completely arranged outside a hearth. The cyclonic air cap is provided with an airflow channel through which air passing through the cyclonic air cap is formed into a rotating airflow. By using the circulating fluidized bed boiler disclosed by the invention, the heated surface in a fluidized bed area is reduced so as to form a burning-required high-temperature area, and the heated surface is increased in the other areas, so that coal gangues or high-quality coal with a calorific value range of more than 850000 calories / kg can be burnt well to generate enough heat.

Description

Technical field [0001] The invention relates to a circulating fluidized bed boiler, in particular to a fluidized bed boiler using coal gangue combustion. 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, papermaking, building materials, chemical, smelting and other industries. At present, in the process of coal mining and washing in my country, a large amount of coal gangue is produced every year, of which less than 15% of coal gangue is used as fuel, and the remaining coal gangue is mostly abandoned. The reason why the utilization rate of coal gangue is low is that coal gangue is a low calorific value and high ash fuel. There are many researches on how to make full use of coal gangue fuel to realize heat exchange. At present, circulating fluidized bed is used. Boil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/20F22B31/08
Inventor 伍尉恒骆大军
Owner 深圳火焰能节能生态环保科技有限公司
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