SU1191680A1 - Method of burning solid fuel in fluidized bed - Google Patents

Description

11 The invention relates to energy and can be used to burn high-ash, high-sulfur solid fuels, such as coal, containing pyritic sulfur, to obtain thermal energy in the form of steam, hot water, or heat-transfer gas. The aim of the invention is to improve the economy. The drawing shows schematically a device for implementing the proposed method. The device contains air inlets 1, an air duct 2 with gas distribution 3 and 4 discharge pipes, as well as a combustion chamber 5 with a chiller 6.} {iifi uidsh1s: neither the combustion products, the overflow threshold 7 and the branch pipe 8 as well as the hydraulic system 9 When operating, the device initially creates a fluidized bed of inert material, for example, ash of fuel that has been accumulated in advance. For this, through the air inlets 1 into the air duct 2 of the gas distribution grid 3, air is supplied, which through the openings in the grid and discharge pipes 4 enters the combustion chamber 5. At the same time, the required amount of inert material is supplied to measure 5 of combustion. After heating the fluidized bed, fuel is supplied from above to the fuel chamber by a continuously operating pneumatic spreader 6. At the same time, the coarse ash of the burned fuel is discharged through the overflow threshold and removed by means of a hydro-ash body (not shown. Gaseous combustion products and dust are removed). 8. Particles of sulfur pyrite and rocks sink in a fluidized bed, are not directly discharged through discharge pipes 4 I. They are removed by means of a hydraulic system 9. The inclination of the gas distribution grid 3 towards the slope narrow tubes 4 facilitates the rapid removal of sunken particles of pyrite or rock from the reaction zone. Example. In a suspended layer 850 mm high, burn class 0-13 mm coal with heat of combustion Q n 2195 kcal / kg; A 47.7%; 5pg 3.5 % ;, W - 23.4%. The ashes are discharged through the overflow from the upper boundary of the layer, and pyrites - from the bottom of the combustion chamber. Gaseous combustion products are discharged through the exhaust duct from the top of the combustion chamber. The temperature of the bed is controlled to 750900 ° C. . The temperature of the air entering the furnace,. The seeding of the original coal and pyrites discharged from the furnace, following: Particle size, 1-3 3-6 6-13 The content of fractions in the source 30.7 22.7 21.2 25.4 coal,% The content of fractions in pyrite, 6, 1 15.9 76.8% 1, 2 The ratio of the rate of air oxidant to the rate of the growth of pyrite particles of maximum size is 0.3.

Claims (1)

METHOD FOR BURNING FUEL FUEL IN A PSEUDO-LIQUIDED LAYER by feeding an oxidizing agent under a layer and removing ash separately from flue gases, characterized in that, in order to increase efficiency at a high concentration of sulfur pyrite particles in the fuel, the oxidizing agent is fed at an average speed of 0.3-0 , 6 from the speed of the soaring of particles of sulfur pyrite, and the settling particles of pyrite are continuously removed from the combustion chamber separately from ash and flue gases.