SU474665A1 - Shaft furnace fluidized bed - Google Patents

Description

one

The invention relates to devices for carrying out the process of heat treatment of bulk materials, for example, from clay, volcanic and other rocks in the production of porous aggregates for concrete.

Fluid bed furnaces are known for firing bulk materials using gaseous fuels, divided into heating, firing and cooling zones and having a bottom burning zone recruited from burners made with a central gas supply tube and a peripheral air supply tube.

However, in this furnace, the material between the burners lies considerably above the level of the nozzles. When firing in such a furnace, bulk materials that have the property of sintering, for example, from clay, volcanic and other rocks, in the firing process in places of bedding, the material is sintered, which leads to the termination of the technological process.

The purpose of the invention is to reduce the occurrence of material between the burners above the level of the nozzles, thereby preventing its sintering.

This is achieved by the fact that the burners are uniformly located on the hearth, and the air supply tube of each burner is made with a diffuser, and the gas supply tube with a conical nozzle, which forms an annular

a channel and having a central opening for the gas outlet, the burning zone of the furnace at the place of installation of the bottom is made conical with the location of the discharge chute at the upper level of the fluidized bed.

FIG. 1 shows the proposed furnace, longitudinal section; in fig. 2 - gas burner device; in fig. 3 shows the node I in FIG. 2

The furnace is a vertical lined shaft, divided by partition 2 into two zones: the top is thermal treatment, the bottom is roasting. In the heat treatment zone, a perforated bottom 3 is installed. The furnace is equipped with a lined cyclone 4, an external overflow 5 with a valve gate, a collector system 6, a gas-burning device 7 and a discharge chute 8 from the burning zone.

The gas burner device is made in the form of a set of sections, each of which has a housing 9, a gas collector 10 n evenly distributed burners (node I). Each burner has a gas supply pipe equipped with a conical nozzle 11 with a central channel 12 for gas outlet and is located coaxially inside an air supply pipe equipped with a diffuser 13, which forms an annular air channel with the conical nozzle 11.

The furnace can be of one, two or multi-zone, round, elliptical, rectangular or any other shape.

The furnace works as follows.

Crushed or granulated material, such as crushed clay, is fed to the heat treatment zone of the furnace, where it is heated by the heat from the gases coming from the burning zone. From the heat treatment zone, the material but the external overflow 5 enters the burning zone, where it is heated to the pyroplastic state and swelling due to the heat generated during the combustion of the gaseous fuel directly in the fluidized bed of the material. The expanded material is discharged from the furnace through the chute 8.

Gas and air through the system of collectors 6 and the bottom gas burner device 7 is fed into the burning zone, where they are displaced and the gaseous fuel is burned. Exhaust gases from the burning zone after cleaning in the lined cyclone 4 are fed through a grid to the heat treatment zone.

Subject invention

The fluidized bed shaft furnace for calcining the bulk material, comprising heating and hearth burning zones, recruited from burners made with a central gas supply pipe, a peripheral air supply pipe, characterized in that, to prevent sintering of the material, the burners are evenly distributed throughout the bottom area , the air supply tube of each burner is made with a diffuser, and the gas supply tube is made with a conical nozzle, which forms an annular channel with a diffuser and has a central opening for the exit of gas, and the burning zone is chi at the installation site of the hearth is conical with unloading chutes located at the upper level of the fluidized bed.

TsSh LD11PPPP | 10PP 1 zziHr ::;