SU726059A1 - Method of thermal processing of coal-containing raw material ceramic articles - Google Patents

Description

(54) METHOD OF HEAT TREATMENT OF CERAMIC PRODUCTS FROM CARBON-CONTAINING RAW MATERIALS

I

The invention relates to building materials, namely the production of wall ceramic products and drainage pipes from fuel-containing and raw materials.

There is a method of heat treatment of ceramic products from carbonaceous, including the temperature rise from initial to optimal for carbon burnout at a rate of 10 -60 ° C / holding at this temperature for the time required to complete the process, further raising the temperature to its final value and holding at this temperature for 2 hours and natural cooling for at least 8 hours l.

The closest to the proposed invention is a method of heat treatment of ceramic products from carbon-containing raw materials, including heating, holding at a maximum temperature, the supply of an air-steam mixture from (air less than 1, cooling 2j.

The disadvantages of these heat treatment methods are the need for an additional heat source. Additional fuel consumption eliminates the burning of products (the need to build fuel oil storage facilities, gas or fuel oil supply systems, etc.). In the absence of liquid or gaseous fuels, solid fuels are used, which are fed directly to the burning zone of tunnel kilns, or are pre-gasified in gas generators. The installation of gas generators, in order to gasify solid fuels for tunnel kilns, is not eco-emitting due to the considerable costs of their construction and maintenance during operation.

/

B. As a result of using products to heat up to the maximum temperature of liquid or solid fuels, the quality of the products is reduced due to the formation of raids and highlights on their surface.

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726059

The purpose of inventions; - improving the quality of products, reducing the cost of the last P X for the account of excluding the supply of fuel to heat treatment. .....

The specified goal is that way; heat treatment of ceramics products from carbon-containing gas, bklyuchayuschee heating, holding at maximum temperature, supply of air-vapor mixture from air axes less than I, cooling, ShrbvbzdushnuK); at the end of the zone 800-12OO C to direct the PA produced by the {air-gas mixture in the next in the amount of 21-36%.

f jf

When steam and air are supplied to the furnace, along with the formation of

79

what about

+ -y-with

coke

21

79 79

2C 4- Og H- H: 2CO 4 .. + 55514 cal

21:21 2

C + CO + 2CO 4 m - 39893 cal 21 2, 2T

2SOCH- O «- .2CO. H-2

 21. 21

The heat of combustion of a water gaz is higher than that of air gas, because water

More hydrogen and hydrogen oxide are produced by reducing the nitrogen content. Water gas formed

This method reduces the temperature of the material, eliminating the formation of a liquid phase in it, which slows down the gasification process. The change in our own steam-air leads the Gasification process according to a rational regime, obtaining vapor-gas gas that is necessary; : -:, ----.

The proposed method is implemented during the heat treatment of ceramics, of solid products from the coal preparation wastes from the Dtsnetsky and Ekibastuz yrojibifibix basins.

Example 1. At the production of products from the Donets basin of the Donets Basin (the Dolzhanska-Kapital processing plant), gas-fired fuel, CoifepWA EXTREMELY IN IZHI: Y1GH; 1g rbK; svdd Shk teperturam site BOO-80O ° C by supplying this section with a pressure of 2.5 these and air at (X 0, Steam obtained; air in the amount of 21% Hanpia-Air; gas, which causes a decrease in the temperature of the medium at the gasification section, as can be seen from the above reactions.

. When water vapor is supplied to the gasification zone

С-Ь 2Н „О

coke2. steam

- CO 4- H, - ZO044 cal

 С + 2Н „О. coke steam

  20195 cal С 4 СО: 2СО - 39893 cal.

When air is blown into the gasification zone

79

+ 954О7 cal

N,

21

M „4 135300 cal.

They were put on the 8OO-96O C temperature increase section by creating a vacuum at the end of this section of 1 mm water column.

For example, when burning products from coal wastes of the Ekibastuz basin, gasification of the fuel contained in the products is carried out in the temperature range of 600-800 ° C by feeding to

this section of steam with pressure of 3, O, and air at (X 0.4. The resulting vapor-gas gas, in the amount of 36%, is directed to the section of temperature rise 800414 ° C by creating a vacuum at the end of this section of 2 mm of water. Art.

The method allows roasting of ceramic products from fuel-containing raw materials without additional consumption of de (}) mineral fuel (gas, fuel oil), improve product quality and reduce construction and operation costs.

furnaces. For one tunnel kiln with a capacity of 25 million pcs. conv. brick annual economic effect as a result of reduced fuel consumption will be about 24 black.

57260596

. Formula and 3 obreten and Sources of information.

The method of heat treatment of ceramic taken into account in the examination

products from carbonaceous SF, including heating, exposure at maximal-1. A. Shlykov, V, et al. On the effect of a low temperature, steam-air supply (some facts) on burnout kinetics

the mixture with air L is less than 1, cooling, carbon in ceramic products from from t. and h and with the fact that with the coals of coal preparation plants I collect the improvement of product quality and the si-nik VNIISTROM. Technologists of the cost of the latter due to the floor. Building ceramics and artificial

elimination of fuel supply to the Juporous fillers, M 1975, 33 (61)

washing, steam-air mixture is supplied. 3-15.

in the zone with a temperature of 600-8OO C. create a discharge of 1-2 mm of water, art. in con-2. Alperovich I. A. and others. Stoves

zone 8OO-12OO-C for the direction of prevention of efflorescence on a clay-filled steam-air mixture in 15Biche. Overview information VNIIESM.

the latter in the amount of 21-36%. M., 1977, p. 42-43.

Claims (1)

SUMMARY OF THE INVENTION A method for heat treatment of ceramic articles made of carbon-containing raw materials, including heating, holding at maximum temperature, supplying a steam-air mixture with air L less than 1, cooling, heating, so that in order to improve product quality and reducing the cost of the latter due to the complete exclusion of fuel supply for heat treatment, the steam-air mixture is fed into the aeon with a temperature of 600-800 ° C, create a vacuum of 1-2 mm of water, Art. at the end of aeons 8OO-12OO ° С for directing the resulting steam-air mixture to the last 15 in the amount of 21-36%.