SU1732127A1 - Technological system for production of cement - Google Patents

Abstract

SUMMARY OF THE INVENTION: The technological complex comprises a kiln unit, raw materials and cement mills, electric precipitators, smoke exhausters and chimneys interconnected by ducts, as well as silo-type containers for storing raw materials and clinker, connected by means of transport devices to the kiln unit and mills. The silo type tank is built into the chimney. In the lower part of the chimney, ceilings are mounted on the wall brackets, which form a silo-type tank with sub silos and supersile rooms. Above the upper overlap in the chimney introduced flue from the exhaust fan. The lower overlap has additional supports in the form of intermediate bearing columns. The ash funnel can be connected with a chute equipped with a gate with a silo-type tank. 1 hp f-ly, 2 silt,

Description

The invention relates to the building materials industry, in particular to the production of earthing substances, and can be used in the preparation of cement, as well as in other areas where the processes of storing bulk materials and their heat treatment at high temperatures take place.

The technological complex for cement production at the Ararat cement-slate combine is known.

Technological complex for the production of cement includes a furnace unit, raw materials and cement mills, electric precipitators, smoke exhausters and chimneys, interconnected by gas ducts, as well as

silo-type storage tanks for raw materials and clinker associated with a kiln unit and mills with transport devices.

However, this technological complex is characterized by the need for large production areas, significant capital expenditures on the construction of reinforced concrete silos and chimneys.

The closest to the proposed technical essence and the achieved result is a technological complex for the production of cement, including furnaces, raw materials and

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cement mills, interconnected gas ducts, electrostatic precipitators, smoke exhausters and chimneys, as well as silo-type tanks for storing raw materials and clinker. At the same time, the silo type tanks are equipped with clinker level sensors and materials and are connected to control drives of transport devices.

However, this complex is characterized by significant capital expenditures for the construction of silos, providing a four- and ten-day stock of clinker. In addition, the construction of a silo complex requires additional production space.

Capital expenditures for the construction and repair of chimneys are also considerable, and their height has been increased in accordance with the increased requirements for environmentally friendly production. The latter adversely affects the flue pipe stability, especially in seismically hazardous zones.

The purpose of the present invention is to reduce capital costs, save production space, as well as improve the reliability, durability and seismic stability of chimneys.

FIG. 1 shows the technological complex for the production of cement; in fig.

2 is a separate node.

The technological complex includes a furnace unit 1 for firing clinker, containing, for example, a baking cyclone heat exchanger system with a decarbonator, a furnace and a refrigerator, mills 2 and

3dl grinding raw materials and clinker with additives, silo type tanks - silos 4 and 5 for storing raw materials and clinker, electrostatic precipitators 6 and chimneys 7 installed both in the cold and in the hot ends of the furnace unit and associated with the exhaust fan 8 The furnace unit 1 by ducts 9-11 in the cold end is connected to raw material mills 2, and further to electrostatic precipitator 6 and chimney 7, and at the hot end after the refrigerator ducts 12 and 13 are also connected to electrostatic precipitator 6 and chimney 7.

At the same time, the kiln unit 1 at its entrance is connected (by means of baked cyclone heat exchangers with a decarboniser) by transport devices 14 to silos 15 to homogenize the raw mix and then to the raw mills 2 to grind the raw materials, and the latter, in turn, transport devices 1 b with silos 4 for storing raw materials.

The outlet of the kiln unit 1, which is equipped with a cooler at the end, is connected with transport devices 17 to silos 5 for storing clinker and additives. Silos 5 are then connected with cement mills 3 by means of transport and metering devices 18. One of the silos 4 is built into the chimney 7 located in the cold end of the kiln, in the lower

0 parts of the chimney 19 flue 7 on the wall brackets 20 are installed 21-23. The shutoffs 21–23 form the silo 4 itself with the sub-silos and supersile rooms 24 and 25, with the sol-ceiling 21 having a funnel 26 installed in the upper and serving as the ceiling of the silo room 25. The duct 11 connecting the electrostatic precipitator 6 and the chimney 8 with chimney 7, enters the latter above the supra-silo room 25, equipped with a device for transporting raw material to silo 4 through the ceiling 22 serving as the ceiling of the silo 4. The lower ceiling 23 forming the bottom of the silo 4 and serving as the ceiling in the silo room 24, it it has supports 27, made, for example, in the form of four symmetrically arranged intermediate bearing columns,

The ash funnel 26 is 21 co0 united by chute 28, provided with a shutter 29, with an internal volume of silo 4.

It is also possible that one of the clinker silos 5 is built into the chimney 7 located at the hot end

5 of the furnace unit 1. At the same time, all the design features implemented in the chimney 7 containing silo 4 for storing raw materials are preserved. Accordingly, in the supersol room

0 25 enters the transport device 16, supplying the finished product - clinker from the refrigerator of the furnace unit 1 to the silo 4, and above the supersilic room 25, the gas ducts 13 are introduced from the exhauster 8 into

5 chimney 7.

The complex works as follows.

The raw materials obtained in the quarry and processed in a known manner,

For example, limestone and clay come from a warehouse to a dosing unit consisting of silo-type containers - silos 4, one of which, for example, for storing loose clay, is built into chimney 7. From

5 silos, 4 clay, limestone, and, for example, pyrite cinders are fed into the raw material mills 2, where the flue gases 9 come from the kiln unit 1 to the exhaust gases. Dried with flue gas and ground

the raw mixture using transport devices 14 enters the silos 15 for averaging the raw mix and then to the kiln unit 1. After passing the heat preparation in baking heat exchangers and firing in the rotary kiln, the raw mix is turned into a finished product - clinker. The latter is cooled in the refrigerator included in the kiln unit 1 and transported by means of transport devices 17 to silos 5 for storing clinker and additives. From silos 5, transport devices 17 clinker and additives are sent for grinding to cement mills 3, where the cement production cycle is completed. The products of combustion of fuel that are formed during firing of the raw material mixture are exhausted through a rotary kiln, baking heat exchangers entering the kiln unit 1 , gas duct 9, raw mills 2, where they are partially cooled, drying the material being crushed, and passing through the gas duct 10 to the dust removal in the electrostatic precipitator 6. Then through the gas duct 11 through the chimney 7, the cleaned flue gases (mainly Air with a very low dust content is released into the atmosphere. The dust collected in electrostatic precipitators 6 is returned to the furnace by any known method either from the cold or from the hot end of the furnace. A small amount of dust accumulating in the chimney 7 on the ash ceiling 21 is also returned to the process, coming from the funnel 26 through the chute 28 when the gate 29 is opened to the silo 4 for storing raw materials, such as clay.

The firing of the clinker product is cooled in the refrigerator by sucking the cooling air through it with the exhauster 8, which also requires cleaning in electrostatic precipitators and, accordingly, emission into the atmosphere through the chimney 7.

Taking into account the lower dust content of the air, from a refrigerator in the hot end of the furnace, as a rule, smoke pipes of smaller diameter and smaller height are constructed. Therefore, it is advisable to embed silos in these chimneys for storage of additives introduced during grinding into the cement mix.

The present technological complex is distinguished by its compactness, which allows to save part of the production area by partially combining the volumes of the chimney and silo for storing bulk materials.

The ability to use the bottom

part of the chimney, having built in it only horizontal overlaps and by introducing the flue duct into the chimney above the silo-type tank, makes it possible to exclude

construction of a separate silo and significantly reduce the capital costs of its construction.

In addition, this increases the stability and reliability of the barrel itself.

and its foundation, since the presence of a silo with transverse overlaps of the pipe weakens and strengthens the barrel of the pipe.

The invention also provides for a simpler and more economical method of returning dust from the ash pan directly to the silo for storing material, i.e. direct to production without loss.

Claims (2)

1. Technological complex for cement production, including related transport units of the kiln unit, raw materials and cement mills, electro-filters, smoke exhausters and chimneys interconnected by ducts, as well as silo-type tanks for storing raw materials and clinker, in order to reduce capital costs, save production space , as well as improving reliability, seismic resistance and increasing the service life of chimneys, the silo-type tank is built into the chimney and is formed installed in the lower part of the chimney trunk on the near-wall brackets with overlaps that divide the pipe into the subsilic and supersilic rooms, above the upper ash slab, equipped with a funnel, the flue duct from the exhauster is inserted into the chimney, and the lower slab made with supports in the form of intermediate bearing columns. 2. Technological complex according to claim 1, which is characterized by the fact that, in order to simplify the technology, the ash funnel is connected with a chute, equipped with a gate, with a silo-type container. I sixteen Rig. 2