RU1772522C - Furnace of fluidized bed - Google Patents

Description

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(21) 4705534/06 (22) 03/22/89 (46) 10/30/92. Bull. Mg 40 (7T) Research and Production Association for the Research and Design of Power Equipment named after I.I.Polzunova

(72) I.N.Steiner and V.V. Stropus (56) Borodul V.A. et al. Burning of solid fuels in a fluidized bed. Minsk: Science and Technology, 1980, p.191.

USSR copyright certificate No. 1483167, cl. F 23 C 11/02, 1985.

(54) BOILER OF BOILER LAYER

(57) Usage: thermal power industry and areas of national economy, where the processes of burning solid and liquid fuels, as well as combustible waste, are used. Essence: a fluidized bed furnace contains a combustion chamber 4 with an ignition device 10 and fuel supply pipes 12, a perforated distributor 8. horizontally mounted in a fluidized bed above the air distribution grill 3, and the combustion chamber 4 is framed by a distributor 8, the perforations of which are made from the side of the air distribution grill 13 and fuel supply pipes 12 are installed on its end walls 1. 1 ill.

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The invention relates to the field of boiler boiler engineering and can be used in other areas of the national economy, where furnaces are used with the process of burning combustible solid and liquid fuels and raw materials in a fluidized bed of an inert or chemically active aggregate (sand, crushed limestone, chamotte etc.).

Known furnace devices that burn solid, liquid, gaseous fuels and waste in a fluidized bed. Their design is very diverse. In the known analogues and prototype, the main fuel and the kindling fuel are supplied and distributed separately, entrainment is burned in the layer or above the layer also due to its separate supply and distribution. Ignition of the fluidized bed (fluidized bed) combustion device is carried out by heating the filler with the help of a freestanding combustion fuel combustion chamber, in which combustible gas is generated, which is supplied to the distributor and distributed via the spout, heated to the ignition temperature of the main fuel previously loaded into the layer.

The presence of a fluidized bed furnace and a kindling combustion chamber complicates the design and operation.

The aim of the claimed technical solution is to simplify the design.

This goal is achieved by the fact that the kindling combustion chamber is built into the furnace and enclosed in a distributor housing mounted strictly horizontally, the perforation of which is performed only on the side of the air distribution grill and is located above the drain channel of the bed, and all pipelines for supplying ignition and main fuels, combustible entrainment mounted on its end walls. Such a solution gave rise to an additional forced circulation of the solid and gas phases of the bed, which led to the leveling of hydraulic irregularities of the fluidization and separation of the enlarged part of the bed aggregate on the hearth in the shadow of the combustion chamber. This is an additional object of the invention.

The drawing shows a fluidized bed furnace with an integrated combustion chamber enclosed in a housing perforated only from the air supply side of the grill.

- The fluidized bed furnace contains enclosing walls 1 and is bounded below by a hearth-shaped cap-shaped air distribution grill 3. Air is supplied to the grill through a pipe b from the air box 5. The combustion chamber 4 is built into the thickness of layer 2 and

consists of an external gas distributor 8, inlet of main and ignition fuels 12 and entrainment 9, an igniter 10, inspection hatches mounted on the end walls of the combustion chamber 4. Under the combustion chamber 4 (in its shadow) in the grate 3 there are lockable channels for draining the layer. Air to protect the underwater nozzles from ingress of solid phase is supplied to the combustion chamber through the nozzle 13 from the main air duct 5.

The furnace works as follows. The layer of aggregate layer in the furnace is liquefied by air supplied from the duct 5 through the grate 3. Moreover, before kindling

the bed is poured with a height greater than the mark of the forming distributor of the combustion chamber 4. A portion of coal is supplied to the fluidized bed through the system and the main fuel supply pipe 12, equal to 710% by volume of the total layer. The gas igniter 10 is turned on and liquid ignition fuel supplied through the combined nozzle 12 is ignited from it. As the ignition fuel burns due to

air entering through the perforation of the distributor from the grill, the main fuel is gradually ignited. After complete ignition of the main fuel at t 600 ° C, the feed into the chamber

main fuel, and the furnace in terms of temperature and hydrodynamics is brought into normal operation with t 850-900 ° C. Air through the nozzle 13 is constantly supplied in the priming and main modes. The enlarged portion of the bed is drained through drainage channels as necessary.

Claims (1)

The claims A fluidized bed furnace containing a combustion chamber and a kindling chamber with an ignition device and fuel supply nozzles, as well as a perforated distributor, horizontally installed in a fluidized bed above the air distribution grill, characterized in that, in order to simplify the design, the kindling chamber is located in said distributor, the perforations of which are made on the side of the air distribution grill.