SU1386640A1 - Method of burning up coal - Google Patents

Abstract

The invention relates to a method for burning coal and reduces the chlorine content in Dan gases with a simultaneous reduction in energy costs. The coal is crushed, subjected to heat treatment with a mixture of air and steam with a ratio of the latter to carbon of 6.5-30 mol.% At a temperature of 1110-1185 K, the resulting gaseous products are separated, then the coke residue is burned. 1 tab.

Description

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i The invention relates to methods for the kigany of coal with a high content of chlorine and alkali metals (saline coal) and can be used in the energy sector to produce electricity and process steam.

The aim of the invention is to reduce the chlorine content in the flue gas with | simultaneous reduction of energy costs

I Example 1: In a boiling-bed apparatus, saline coal is heat treated with the following composition,%:, 6; A 1,2; 5, 2; , 2; , 3; (0 + N + 4Sr 19.5, K ,,, 4; chlorine 0.8.; The apparatus is continuously supplied with izdelenny coal along with the sorbent of the Soddy compounds and subjected to thermal processing with air at 1: 000 K, the resulting gas and coke residue, burn coke in the burning layer at 1200 K. Flue gases from burning coke are sent to the furnace where the heat treatment gas is burned carbon. The chlorine content of the coke oven is 0.4%, the chlorine content in the zone after the combustion 0.01% of the coke residue in the flue gases of the firebox contains 99% of the amount of chlorine in iso salted coal.

Example 2. In an apparatus with a bale - ijtHM layer, the ground coal is continuously fed - ijieHHbm salted coal together: this coal is heat treated with a vapor mixture at 1090 K and a ratio of 6.5 mol.%, The resulting gas and coke residue are separated. The coke is burned in a fluid bed apparatus. The gas after heat treatment is cooled to 320 K, passed through a vessel with water, and burned in a furnace. Flue gases are supplied to the furnace after burning the coke residue.

Examples 3-7. The method is carried out according to Example 2, only the temperatures during heat treatment are 1110, 1160, 1210, 1260, 1280 K. Ratio H2.0 / C 6.5 mol.%.

Examples 8-15. The method is carried out according to Example 2, only the ratio H, 0 / C 6.0; 7.2; 12.2; 21.3; 26.6; 30.3; 32.0; 34.0 mol.%, Temperature 1185 K.

The data in examples 1-15 are summarized in table.

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From the data in the table it can be seen that during heat treatment of coal according to the proposed method, no more than 0.08% of chlorine remains in the coke residue, i.e. lower than in non-salted coal. The chlorine that passes into the gas phase is washed with water and removed from the system. Consequently, no more than 0.08% of the chlorine contained in the original coal enters the boiler unit, more than 90% of the chlorine is released from the coal.

When the heat treatment temperature is below 1110 K (example 2). The chlorine content in the coke residue exceeds its amount in non-saline hum (x 0.14% in the residue versus 0.1% in non-salted coal), at temperatures above 1260 K (example 7) slagging of the layer and termination of the process occur.

At temperatures of 1110-1185 K, the content of chlorine compounds in the flue gases during the processing of coal is reduced (examples 3,4,8-15), and the energy costs of heat treatment of coal are also reduced, since lower temperatures are used in the process. , below it is usually applied at gasification.

If the ratio is lower than 6.5 mol.%, The chlorine content in the coke residue is higher than 0.1 mol.% (Example 8). Exceeding the ratio of 30.0 mol.% Is impractical because, at its higher values, the chlorine content in the coke residue does not vary and is 0.04 mol% (examples 14, 15).

Thus, when burning saline coal using the proposed method, the concentration of chlorine compounds in I

the flue gases of the boiler does not exceed their value when burning non-saline coal.

Claims (1)

Invention Formula The method of burning coal, including its grinding, thermal treatment with steam, separation of the resulting gaseous products and coke residue, burning of coke residue, characterized in that, in order to reduce the chlorine content in the flue gases while reducing energy costs, heat treatment is carried out smy5 0 0 five 31386640 Air and water vapor at a ratio of 30 mol.% And at a temperature of 1110 ° C of the latter to carbon 6.5-1,185 K.