SU1208445A1 - Multizone vertical fluidized-bed furnace - Google Patents

Description

one

The invention relates to multi-zone vertical fluidized bed furnaces for calcining polydisperse material, such as limestone, chalk, etc., and can be used in the chemical, metallurgical industry AND in the building materials industry.

The purpose of the invention is to reduce the loss of polydisperse material and reduce energy consumption due to more complete use of the physical heat of the fine fraction and the heat of furnace gases in the preheating zone.

The drawing schematically shows the proposed oven.

The multi-zone vertical kiln furnace contains a heating zone 1 consisting of several chambers, a firing zone 2, a cooling zone 3, grilles 4 between zones, burners 5 assembled in a hearth, air ducts 6. There is a technological cyclone 7 connected by an inlet 8 with an upper the chamber of the heating zone, and the output 9, having a sluice gate 10, through the chute 11 with the second material course along the chamber of the heating zone. In heating zones 1, firing 2, cooling 3 using partitions

12 pockets formed 13. Pockets

13 are sequentially connected with the overflow devices 14. The pocket 13 of the cooling zone 3 is equipped with an autonomous air duct 15.

The process of calcining the material in a multi-zone vertical furnace is carried out as follows.

A polydisperse material containing O-10 mm fractions is loaded into the furnace. The material of the 3--10 mm fraction is fired in a fluidized bed. Material fractions of 0-3 mm through the inlet 8 is carried in techno 1208445.

The cyclical cyclope 7 and settles in its bunker. Then the material of the .0-3 mm fraction is directed through the inlet shutter 10 and the chute 11 into the formed 12 incomplete full height of the wall 12 partition: an 13. In the pocket spaces 13, the heating, roasting and cooling zones maintain the temperature conditions and in the main spaces of the furnace.

Using an autonomous duct 15 and burners 5 in the pockets 13, they create a fluidization mode corresponding to a fraction size of 0-3 mm. By

15 by the overflow devices 14, the fine fraction first falls into the pocket of the burning zone, then into the pocket of the cooling zone. The finished product is removed from the oven and sent to the consumer.

20 The small fraction in the unfired form is carried to a process cyclone with a temperature of about 300-400, and the calcined product leaves the cooling zone at a temperature of 5025 100 C. The difference in heat from the discharge from the cooling zone and at the exit from the heating zone to the cyclone is used for decomposition fractions in the burning zone. No return for firing

30 of the fines fraction, the heat of furnace gases escapes from the furnace, and when recovering the heat loss of furnace gases significantly decreases.

The proposed fluidized bed furnace

2 allows to reduce the loss of the processed material, as well as reduce the energy consumption caused by the need to additionally heat the material in the external furnace, Combined-t

4Q inging in one furnace of two processes

allows you to significantly reduce heat loss to the environment, and the lack of a remote furnace and a hot cyclone allows you to reduce capital costs for the construction of the furnace.

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Editor M.Dshyn

Compiled by I. Inozemtsev

Tehred O. Vashchishin Proofreader M. Pojo

Order 243/52 Circulation 561 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPG1 Patent, Uzhgorod, st. Project, 4

Claims (1)

MULTI-ZONE VERTICAL BOILER FURNACE, containing the first and second in the direction of the material heating zone, the firing zone and the cooling zone, gas distribution grilles installed between the zones, air ducts, burners, transfer devices and a process cyclone connected by the inlet pipe to the heating zone, characterized in that, in order to reduce the loss of polydisperse material and reduce energy costs due to a more complete use of physical heat of the fine fraction and heat of the furnace gases in the heating zone, the second it is heated, the firing and cooling zones are equipped with vertical dividing walls: in the firing and cooling zones are deaf, and in the heating zone - with a set clearance at the top, while the zone chambers formed by the partitions are connected in series with each other by transfer devices, the cooling zone chamber is equipped with an autonomous air duct, and the outlet of the cyclone is connected to the second heating zone. SU., „1208445