DE389143C - Process and shaft furnace for burning lime, cement and roasting ores - Google Patents

Description

The burning of lime, cement or the roasting of ores is usually carried out in the Way carried out that these substances in a shaft furnace in layers with coke or directly mixed with coke are subjected to a combustion process. It must . so first coke will be produced to this then to be used for heat generation or for reduction purposes when burning.

ίο When using coal directly Place of coke go. Those contained in the coal Most of the oil or hydrocarbons are lost. It's already suggested been to smolder the coal in a .Schwelretorte lying in the shaft furnace. But coal and goods were not mixed together. It is also known to first place bituminous rocks in a retort to treat and after aborting the volatile j

so to finish burning components in a furnace, j but no fuel is added. The invention now represents a new method for burning lime, cement, etc., that allows the burning of cement, lime or the like in one operation with a mixed fire To carry out roasting of ores and as fuel in place of coke all stone, brownu. Like. To use types of coal, and without additional heat supply only by utilizing the resulting from the burning Waste heat to directly win the carbonization products located in these coals.

The procedure and the shaft furnace required to carry it out are as follows explained in more detail:

On the two or more sides with The base 3 provided with draw openings is an iron jacket 2.

In the lower part of it, a thick, fireproof inner jacket extends up to about halfway

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Height (digit 5). A smoldering retort 6-6 made of cast iron or fireclay is built in at the top. It extends with its lower end to the gas discharge slots 7.7 for the Fuel gases.

The upper end of the shaft furnace is with any known tightly sealing pouring device 8 is provided. ,

The combustion gases are passed through a duct around the retort and at 10 into a chimney stone or better passed through a fan 17. An air duct can be inserted into the duct 10 can be installed to preheat the air through the exhaust gases and through the distribution chamber 11-11 ring-shaped at the shaft furnace foot Feed slots evenly.

The smoldering oils formed in the upper part of the retort 6 are partially drawn off through long perforated tubes 12 inside or through >. the coal layer through directly into the! Exhaust duct for carbonization gases and vapors at J 13 sucked off. At points 14 and 15, two lines are attached, which supply steam or water. The purpose of the line 14 is to reduce the smoldering temperature in the retort 6; regulate and to effect a steam distillation of the carbonization products formed. The purpose of line 15 is to re-introduce water vapor into the more highly heated zones in order to decompose the calcium sulfide formed: according to the formula CaS + H ₂ O = CaO + H ₂ S. The H “S vapors are passed through the exhaust gas duct withdrawn and can be used in a known manner for the recovery of sulfur.

The work process in the furnace takes place as follows:

To blow the shaft furnace, the necessary fuel, such as wood and coal, is ignited in the lower part and above it the cement raw materials in the form of briquettes, which are made from i fuel and powder! Cement raw material j are produced, or the ores to be reduced | or other minerals either mixed with the carbon black directly or introduced in alternating layers with carbon black until the shaft is filled. Thereafter, a gentle draft of air is generated by the fan 17 in the gas duct 9 until the wood burns and coke has formed from coal in the lower part of the furnace. Then the draft is increased and after the pre-burning a second fan behind the suction channel 13 for the! Smoldering vapors put into operation. This means that part of the superheated gases is passed through the smoldering retort 6, while another part gives off its heat from the outside to the retort. The draft is regulated in such a way that a temperature of 400 to 500 ^° C. is achieved, depending on the type of coal. Now water vapor is introduced through line 14, whereby not only a stability of the smoldering temperature is achieved, but also the last air residues, which could have been sucked in, are rendered harmless by the steam. The steam also has a distillation effect at the same time.

The steam introduction through line 15 is effected in a zone having a temperature between 600 and 900 ^0, wherein 7 "temperature is the removal of sulfur on. In \ ^r erlauf of the combustion process, the coal is on its way from top to bottom the oil and hydrocarbons in the retort are initially coked in the middle part and burned in the lower part of the furnace, causing the sintering of cement or the burning of lime.

The finished product can be removed from below by a mechanical discharge device while at the same time raw material in layers by hand or mechanically is refilled.

The filling device can be airtight.

The carbonization gases and vapors obtained can be condensed using a known method and further processed.

Claims (2)

Patent Claims: ι. Method of burning lime, cement and for roasting ores in a shaft furnace with a smoldering retort while simultaneously extracting the smoldering products characterized in that the raw mass is mixed with non-degassed fuel, the mixture in the smoldering retort under Blowing steam smoldered and then firing in the lower part of the furnace while blowing steam again, whereby the Flue gases wash around the outside of the smoldering retort. 2. Shaft furnace for performing the method according to claim 1, characterized in that that the firing shaft (io ") forms the extension of the smoldering retort (6), no and that both the burning shaft and the smoldering retort have separate prints (10, 13) and have separate steam feeds (15, 14). 1 sheet of drawings.