CS262175B1 - Equipment with shaft, preheater and fluid reactor for heat treatment and calcination of powder material - Google Patents

Abstract

The solution concerns a device with a shaft preheater and a fluidized bed reactor for the thermal treatment and calcination of powder material connected by a reactor gas channel with a furnace gas channel and a powder material chute with a discharge cone of the shaft preheater. Before the furnace gas channel enters the shaft preheater or a pair of shaft preheaters, a horizontal cyclone stage or a pair of horizontal cyclone stages is included, where the calcined powder material is separated from the furnace gases, which then enter the shaft preheater or a pair of shaft preheaters, while the calcined powder material is introduced into the input part of the rotary kiln through a chute. This prevents the re-entry of the already calcined powder material into the shaft preheater and its mixing with only preheated material, thereby improving the thermal efficiency of the system.

Description

The invention relates to a device with a shaft preheater and a fluidized bed reactor for heat treatment and calcination of powdered material such as cement raw materials, limestone.

Previously known devices of this kind are designed so that the powder material supplied from the shaft preheater to the fluidized bed reactor is partially or completely entrained in the furnace gas channel through the reactor gases through which it is fed back to the lower part of the shaft preheater. material coming from the top of the preheater. As a result, the overall thermal efficiency of the system is reduced.

The above-mentioned drawbacks are eliminated by the device according to the invention, which consists in that a horizontal cyclone stage is arranged before the kiln gas channel enters the shaft preheater, whereby the calcined powder material is separated from the kiln gases entering the shaft preheater, the calcined powder. material is slipped into the inlet of the rotary kiln. This avoids re-entry of the already calcined powdered material into the shaft preheater and mixing it with only the preheated material, thereby improving the thermal efficiency of the system.

The advantages of a shaft preheater and fluidized bed reactor for heat treatment and calcination of powdered material are that it can be advantageously used in the refurbishment of existing cement clinker firing lines with a shaft preheater or a pair of shaft preheaters with additional The fluidized bed reactor monitors the partial replacement of the noble fuel burned in the main burner of the rotary kiln with less valuable fuel, while the installation of the horizontal cyclone stage preserves the existing gas inlet from the rotary kiln to the shaft preheater so .

Claims (2)

Apparatus with a shaft preheater and a fluidized bed reactor for the heat treatment and calcination of powdered material, comprising a shaft preheater, a fluidized bed reactor interconnected by a reactor gas channel with a furnace gas channel and a powder material slip with a shaft cone failure. In the furnace gas, a horizontal cyclone stage (9) is connected, which is connected by a gas channel (10) to the inlet. The device according to the invention is schematically shown in the drawing. The shaft preheater 1 is provided in the lower part with a two-way flap 2, one outlet of which is connected by the chute 3 of the powdered material to the fluidized bed reactor 4 and the other outlet is connected by the chute 13 of the powdered material to the inlet of the rotary kiln. The fluidized bed reactor 4 provided with fuel supply 5 is connected to the reactor gas channel 6 with a damper 7 connected to the furnace gas channel 8, to which the horizontal cyclone stage 9 connected by a channel 10 gases with a shaft preheater 1. The horizontal cyclone stage 9 is a slip 11 of the calcined powder material is connected to the inlet part of the rotary kiln 12. The powder material exiting through the two-way flap 2 from the shaft preheater 1 is fed through the powder material chute 3 into the fluidized bed reactor 4, from where it is partially calcined with the reactor gas resulting from gasification of the fuel supplied to the fluidized bed 4 through the fuel feed 5. 8, where it further calcines as a result of the combustion of the reactor gases. The calcined powder material is conveyed through the kiln gas channel 8 to the horizontal cyclone stage 9 from where it is conveyed through the chute 11 of the calcined powder material to the inlet part of the rotary kiln 12 for further heat treatment. The gases exiting from the horizontal cyclone stage 9 are conveyed by the gas channel 10 to the shaft preheater 1, where they transfer heat to the powdered material countercurrently. Upon the start-up of the device, the powder material from the shaft preheater 1 is conveyed by the powder material chute 13 directly into the inlet part of the rotary kiln 12, the fluidized bed reactor 4 being out of operation. During the continuous shutdown of the fluidized bed reactor 4, the damper 7 in the reactor gas channel 6 is closed. Alternatively, the shaft preheater 1 and the horizontal cyclone stage 9 can be used in pairs in the apparatus according to the invention. INVENTION of parts of the shaft preheater (1) and of the chute (11) of the calcined powder material with the inlet part of the rotary kiln (12). Device according to claim 1, characterized in that the lower part of the shaft preheater (1) is provided with a two-way flap (2), one outlet of which is connected to the fluidized bed reactor (4) by a chute (3). (13) powdered material with an inlet part of a rotary kiln (12).