SU1736923A1 - Method of roasting carbon blanks - Google Patents

Abstract

The invention relates to the technology of carbon materials, in particular to methods of heat treatment of carbon-containing materials, can be used in the production of electrodes and electric carbon products and allows to increase the yield of suitable blanks and reduce the duration of the process. Carbon blanks are loaded into a multi-chamber ring furnace with shaft chambers equipped with vertical muffle channels. The cooling air is supplied to the chambers with burned blanks, the blanks are heated by the gas-air mixture using hot gas burners in the first heated chamber, exhaust gases are removed to the burs ahead of the last heated chamber, and the burner is further ignited in the subsequent heated chamber the direction of hot gases under the bottom of the heated chambers. 1 il. “

Description

The invention relates to the technology of carbon materials, in particular to methods of heat treatment of carbon-containing materials, and can be used in the manufacture of electrodes and electric products.

The purpose of the invention is to increase the yield of blanks and shorten the process time.

The drawing shows a multi-chamber annular furnace, a vertical section.

The furnace consists of two parallel rows of furnace chambers 1 of mine type, closed by portable arches 2 with gas burners 3. In the chamber walls there are

Vertical muffle channels 4 communicating with the underfloor space, which through vertical chimneys 5 with openings 6 connect with the adjacent chamber and through the exhaust chimney 7, equipped with a gate 8, communicate with the kilns 9 of the furnace. The end chambers of two rows are connected by connecting channels 10 and the chimney system forms a closed ring.

The multi-chamber annular kiln for burning carbon blanks works as follows.

In the firing process, several chambers (No. 3-8) are used, which are covered with arches and CE VI.

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among themselves in a closed system of fire.

After loading, the Nfe 8 with blanks is closed with a vault. The flaps 11 separate it from the preceding chamber No. 9, and the open gate 8 connects it with a selection furnace. Gaseous fuel is burned in chamber number 5, located in the middle of the fire system. The temperature of the gases here reaches 1200 ° C. Combustion products move along muffle channels and chimneys through chambers no. 6–8, heating up the draft in them, and having cooled to 100–150 ° C, are removed through flue 7 to the burs. The air necessary for the combustion of the fuel is drawn in from the open chamber Nfe 2, passes through the chimneys of chambers nos. 3 and 4, cools. the vessel and due to its heat i is heated to 600-700 ° C.

In fire chamber No. 5, a gas burner 3 is turned on and, due to the combustion of natural gas, the temperature rises to a maximum of 1200-1250 ° C. Exhaust gases pass through the muffle channels of the chambers of Mg 6-8, sequentially, heat the sediment with carbon blanks and cool to 100-150 ° C. Through the chimney 7 and the open gate 8 of the end chamber No. 8, the gases are removed to the furnace burs.

After heating the blanks in chamber No. 5, the gas is ignited in chamber No. 6, chamber Nfe 3 is opened, chamber 9 is closed and connected to the boron, then the burning process proceeds successively through the annular furnace system, each chamber successively undergoing loading stages, recuperative heating, heating and cooling.

The method is carried out as follows.

The billets are fired in a multi-chamber annular kiln. The fire system includes cameras Ms 10-17. In the last chamber No. 17, the shutters 11 are installed, but the gate 8 is kept closed and the burner 3 is ignited. Gate 8 is opened in chamber No. 15. Calcination in chambers Ms 11-15 carried out by the indicated scheme with the second burner turned on in fire chamber No. 13. Hot gases from chamber 17 through openings 6 are directed from above to connecting channels of chamber 16, heat its bottom and move along muffle channels from bottom to top (reverse gas flow), after which they are directed to boron through connecting channels. Thus, in the initial period of firing, accompanied by the accumulation of heat in the chamber, the lower part of chamber 16 is heated most intensively. In chambers N 13–15, hot

gases move along the muffle ducts from top to bottom, the upper part of the chambers being most intensively heated. When moving the fire from bottom to top, chamber 17 is heated, and in chamber 16

the gas flow changes direction, which ensures the alignment of the temperature field of the furnace.

The table shows the results of firing using

The proposed method of burning carbon blanks.

Thus, the firing process of the proposed method is significantly intensified and the time to reach the maximum temperature in the muffle was reduced by 100 hours. At the same time, the temperature rise rate in the muffle increased faster than under the roof, and at the final stage of firing (1200-1250 ° С)

between the top and bottom of the camera muffle did not exceed 50 ° C

Claims (1)

The invention The method of burning carbon blanks in a multi-chamber annular furnace with shaft chambers equipped with vertical muffle channels, including supplying cooling air to chambers with baked blanks and heating the blanks in the chamber with an air-gas mixture using burning gas burners in the first of the heated chambers that, in order to increase the yield of workpieces and reduce the duration of the process, gases are removed to the burs before the last heated chamber, and in the subsequent end chamber tively burner is ignited with the direction of the hot gases heated by the hearth chambers. load Air Cooling Heating YoEogray Loading Kdynososu