SU83183A1 - Retortna lime kiln sectional type - Google Patents

Description

The invention relates to sectional type lime kiln kilns with trapping carbon dioxide emitted from calcined lime without carbon, with retorts assembled in the form of batteries from a series of flat vertical sections with cores to obtain horizontal circulation of combustion products.

A feature of the lime-kiln furnace described is that all its retort sections are combined at the top with one common loading chamber equipped with a carbon dioxide removal pipe, and at the bottom with a common discharge manifold, and that the heat of heated carbon dioxide is used.

The advantage of the proposed design lies in the convenience of loading sections through a common upper chamber and in unloading them through a common lower collector.

FIG. 1 shows the installation diagram; in fig. 2 shows an oven in vertical section along A-A in FIG. 3; in fig. 3 shows a furnace in horizontal section along BB in FIG. 2

The installation consists of the following main units: gas furnace 5, scraper conveyor 8, gas generator 12, hammer crusher /, forging elevator 2, elevator 22.

The limestone delivered to the factory is crushed and finely crushed in a hammer mill. The crushed lime to the bucket elevator 2 is fed to the receiving hopper of the furnace 3, from where through the sector gate the feeder 4 is evenly fed to the furnace 5, where it is subjected to roasting. Calcined lime through sector valve 6 is discharged onto scraper conveyor 8, where it is cooled and fed to the finished goods warehouse. The furnace 5 (Fig. 2 and 3) consists of a brick box 7, in which at a certain distance from each other are placed five ceramic refractory (composite in height) sections 23. The gaps between the individual sections form channels // for hot gases . From above and below, these channels are protected by refractory prismatic bars 9, forming a funnel at the upper

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and the lower end of each section to facilitate the entry of raw materials into the retort sections 23 and the exit of the calcined lime.

Sector gates 4 and 6 are driven from the electric motor via a gearbox and a chain transmission.

For selection in the upper part 24 of the furnace there is a pipe M. Fuel 3 of the furnace is supplied by burners 57 / which are mounted in two rows of 4-6 pieces along the height of the furnace. Exhaust gases through gas ducts 13 enter the common channel 25.

The principle of operation of the furnace is as follows (Fig. 1). Finely ground limestone (with a fraction of 0.1-2 mm) is fed into the receiving hopper 3 of the furnace, from where it is fed through the sector locking feeder 4 evenly into the section of the furnace 23 and under its own weight goes down.

Fuel burners 27 are fed between the sections into the channels And and the walls of the sections, heating them to a temperature of 1100-1150 °. Due to a small layer of calcined limestone, which flows in sections, and its fine grinding, extremely rapid dissociation of CaCO3 occurs. Calcined lime through gate 6 is discharged from the kiln. The CO2 gas from port 14 using pipes and special devices is prevented from being used.

When the dissociation temperature is reached, the CaCO3 decomposes into PAO and CO2. The carbon dioxide COA at TCjMnepaType of approximately 1100 ° in the heating furnace through the pipe 14 (Fig. 2) through pipes 26 (Fig. 1) is fed to the gas generator J2. Peat fuel from the warehouse to the gas generator is supplied by a scraper conveyor 8, which passes through the arch for the exhaust gases. Due to the heat accumulated by the vault, peat essence occurs. The dried peat enters the receiving bunker 15 of the gas generator 12, from where the gate by the feeder 16 is fed to the gas generator, where gasification takes place without air access. Due to the high temperature of COg entering the gas generator, peat gasification is rapid and C + is simultaneously reduced. The thus obtained high calorific CO gas with a temperature of approximately 1000 ° through pipe 17 uses gas furnace 18 to supply furnace 5 to which heated air is simultaneously supplied from blower 10. Exhaust gases from the furnace through channel 25 and pipe 19 are emitted into the atmosphere.

Since a significant excess of CO gas is obtained from lime production, the latter can be used for industrial and household purposes.

Ash removal from the gas generator is carried out using the sector valve 20, by which ash is fed to a hydraulic valve filled with water 2 /. From the hydraulic valve, the ash noria 22 is thrown to the dump.

Subject invention

Claims (4)

1. A retortous lime-burning kiln of a sectional type, designed to work with the capture of COA gas, characterized in that its retort sections are combined at the top with one common loading-full chamber and at the bottom with one common discharge manifold. 2. The form is fulfilled: not “and the furnace according to claim 1, that is, so that in order to achieve horizontal circulation of the combustion products around each section, the intersectional intervals and the spaces between the section and the outer shell of the furnace from above and bottom covered with refractory material. 3. The form of the furnace according to claims. 1 and 2, characterized in that in order to facilitate the entry of raw materials from the upper common chamber into the retort sections and exit from their calcined lime to the lower collector, the upper and lower overlaps of the intersection of the interstitial walls and the outer shells of the furnace have a prismatic shape to form a funnel at the top and at the bottom of each section. 4.Pech on PP. 1-3, characterized in that, in order to use the heat of heated carbon dioxide CO, extracted from limestone calcined in a retort furnace, the furnace is connected by pipeline to the core of the gas generator to transfer hot gas to this zone in order to obtain a reaction without air access between red-hot carbon fuels and COa and to get CO without nitrogen impurities. Q FIG I dd 6 i3 - four