Low bed pressure recombination fluidized bed burning fuel with ultralow heat value and using method thereof

Abstract

The invention discloses a low bed pressure recombination fluidized bed burning fuel with ultralow heat value and a using method thereof. The low bed pressure recombination fluidized bed comprises a hearth, wherein an isobaric air chamber is formed below the hearth; the hearth communicates with the isobaric air chamber through a small hood air distributing plate; a high-position buried pipe is arranged above the hearth; a volute separator is arranged at an exhaust outlet and is connected with a hearth returning charge opening through a selective U-shaped return feeder; an emptying pipe is further arranged on one side of the selective U-shaped return feeder; a crushing device is arranged at a feeding hole of the hearth; an outlet of the crushing device is provided with an upper-layer screen plate and a lower-layer screen plate; the pore diameters of meshes of the upper-layer screen plate and the lower-layer screen plate are 6 mm and 4 mm; an outlet of the lower-layer screen plate and the lower part of the lower-layer screen plate are connected into a stirrer through two weighing belt feeder; and a stirrer outlet communicates with the feeding hole. The low bed pressure recombination fluidized bed greatly improves the ash forming performance of gangue and furnace slag and reduces energy consumption of a pressure head of a fluidization fan and abrasion of a combustion chamber; and fluidization in the bed is uniform and stable, the coefficient of excessive air is small, and NOx is reduced.

Description

technical field [0001] The invention belongs to the technical field of fluidized bed combustion equipment, and in particular relates to a low bed pressure recombined fluidized bed burning ultra-low calorific value fuel and a method for using the same. Background technique [0002] Our country's environmental protection has higher and higher requirements for clean coal combustion. Coal shipped more than 300 kilometers away is generally low-ash, clean, and high-calorific value coal: coal washing. With the innovation and development of coal washing technology, the calorific value of gangue washing produced by coal washing plants is increasing. The lower the calorific value, the lower calorific value is mostly lower than 1000 kcal / kg; at the same time, the calorific value of coal slime produced by the coal washing plant is getting lower and lower, and the low calorific value of coal slime with 35% moisture is lower than 1500 kcal / kg. [0003] Nowadays, the calorific value of the...

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Problems solved by technology

[0008] The flow state design of the dense phase area of ​​the traditional fluidized bed combustion chamber has three steady state areas: 0-8mm, 0-10mm, and 0-13mm, which cannot adapt to the full combustion of low fuel value fuels

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