SU779785A1 - Decarbonization plant - Google Patents

Description

(54) INSTALLATION FOR DECORBONIZATION

I

The invention relates to the building materials industry and can be used to decarbonate cement raw materials in the process of producing clinker and finely divided limestone in the process of obtaining lime.

A calciner is known that contains a working chamber; a chamber with tangential, nozzles for inlet air, devices for feeding fuel and raw materials, for removing the decarbonized material and flue gases l.

The disadvantages of this calciner are that the mixing zone of the raw material with air takes up a significant amount of the apparatus and does not participate in the decarbonization process, as well as in the comparatively low intensity of the process, as in the swirling flow, the material separates into the zone in the working part of the apparatus. temperatures and sticks to the walls.

Also known is a plant for calcining a cement stock containing a working chamber with tangential nozzles for. air intake, devices for the supply of fuel and raw materials, removal of decarbonized material and flue gensets. The material here is fed

towards the flow of high-temperature phases, where the formation of dust-gas mixture and decarbonization simultaneously takes place 2.

5 However, in the working area of the calciner, the material is intensively separated to the walls to a zone of lower temperatures, as a result of which the intensity of the process decreases and the material sticks to the walls. The aim of the invention is to intensify the decarbonization of raw materials.

The goal is achieved by

15 that in ydTaHOBKe, for decarbonization, mainly of a cement-raw material mixture, containing a working chamber with tangential nozzles for air inlet, devices for feeding fuel and raw materials, removing the decarbonized material and flue gases, the working chamber is made of two tangent along forming hollow cylinders, communicated between your channel,

25 walls of which are tangential to the side surfaces of the cylinders and form an angle of 90120 between them, and nozzles for air intake are placed in each cylinder and equally

30 sent.

FIG. -1 schematically shows yfetaiHOBKa for decarbonization times; in fig. 2 is a section A-A in FIG. one; pa fig. 3 is a section BB in FIG. one.

The decarbonating device contains a pa6o4ino chamber made of two hollow cylinders 1 and 2, touching the generator 3 and interconnected by channel 4, the walls 5 of which are directed tangentially to the lateral surfaces of the cylinders and the directionTOT of the angle of 90-120. The length of the canal is 4/5 of the length of the installation. The installation is supplied in the same direction; $ 14 E14, for example, clockwise, tangential floors 6 for air inlet, devices 7 and 8 for supplying fuel and processed materials, -Device 9 for outputting decarbonated material and exhaust gases . In some cases, the tangenzial; the nozzles can be replaced by axial air guides with equally directed nozzles.

The installation works as follows, for example, during decarbonization, Cement raw mix.

The air through the nozzles 6 and the fuel through the devices 7 enters the cylinders 1 and 2, where two equally directed cyclone flows are created, in which the fuel is burned. The material to be processed is fed through the device 8 towards the Rod to the area of developed fuel combustion. Particles of material, moving in vortex flows under the action of centrifugal force, are ejected through channel 4 along walls 5 from one cish; ZhiHrivoy pb1r6k u nogog cylinder. The transition from a cylinder to a cylinder towards the rotation of the vortex flow, the particles of the material pass through high-temperature zones with the maximum relative to that.

- .... u ..., -.,., ....

heat exchange takes place and, accordingly, the decarbonization rate of the material.

In addition, as a result of the interaction between the TTS and the length of the installation in the direction of the exit; P1a decreases the twist of the PTS; - P about 15 ° 1; 1: 1; 1) the material sticks to the walls in the high temperature zone and reduces the hydraulic resistance of the apparatus. Decarbonated. the material and the exhaust gases through the output device ts to the cyclone, where the decarbonated material is separated.

As a result of repeated passage of the combustion zone by particles with a maximum relative speed, j, the intensity of the process increases significantly and a high degree of decarbonization of the material is achieved. In addition, intensive mixing of material with smoke gaps due to cyclical. By changing the direction of movement of the particles, we can obtain a uniform {degree of decarbonization of polydispers) tioro of the material.

The use of a decarbonization unit allows to increase the productivity of the kiln units due to the process intensification, to reduce the specific fuel consumption due to the reduction of heat loss to the environment and significantly reduce the length of the rotary kiln.

The use of a decarbonated material to feed the furnace allows unloading the most thermally stressed sintering zone, which

 increases lining durability, increases turnaround mileage and reduces repair costs.

Claims (2)

1.Boldyrev A.S. and others. New methods of crimping clinker in Japan. Cement, 1975, 5, p. 19-23, Fig. eight. 2. The patent of France 2197827, cl. From 04 to 7/48, 1974 ..