Furnaces – Fuel feeders – Blower
Patent
1989-10-16
1991-12-10
Yuen, Henry C.
Furnaces
Fuel feeders
Blower
110265, 432 99, F23K 500
Patent
active
050707973
DESCRIPTION:
BRIEF SUMMARY
The instant invention relates to a process and to a device to feed at least one additive, in particular an energy carrier into a shaft or cupola furnace in which the combustion air is blown through nozzles into a furnace shaft. The invention also relates to the application of the process and of the device for purposes of waste disposal.
The process of charging additives into a cupola furnace is generally known. Two goals are pursued in this, i.e. the reduction of metallurgical coke consumption as well as the control of the operation of a cupola furnace.
In considering the known technical devices used to inject additives in a metallurgical process it appears that because of a double effect of pressure drop and temperature rise at the output point of the injector, the additives to be charged can be fed into the combustion chamber of the cupola furnace only to an insufficient extent.
DE-OS 31 09 111 discloses an installation for the charging of coal into metallurgical process containers with a plurality of blow-in points and an equal number of injection circuits leading to the blow-in points. In order to avoid irregularity in charging fine-grained combustibles into a cupola furnace for example, each injection circuit is provided with voluminous regulating and control devices in this installation. In addition, the fine-grained combustibles are guided in the feeding ducts to the inlet to the combustion chamber by means of a conveying medium.
A process for charging at least one additive, in particular an energy carrier into a furnace is known from DE-PS 154585. In this case the additive is guided into the combustion air stream and is brought together with the latter into the furnace shaft, whereby the additive is sucked into the furnace as a result of a negative pressure being produced immediately at the outlet point of the additive.
This proposal from the year 1903 could not thereafter be used on an industrial scale.
Suction alone is insufficient because: pressure to collapse, counter-pressure to be constituted, causing the negative pressure in the suction pipe to collapse.
This situation can lead to clogging in the coal dust supply section.
In order to avoid the expensive and very delicate control and regulating mechanisms while nevertheless ensuring continuous, even feeding of energy carriers into a metallurgical combustion process, the applicant has endeavored to simplify the known installations while increasing the degree of effectiveness.
This objective has been achieved by a process according to the instant invention in which the additive used is guided into the combustion air stream and is brought together with it into the furnace shaft, whereby the additive is sucked from the combustion air stream into the furnace shaft through the production of a negative pressure immediately at the outlet point of the additive.
The installation proposed to carry out the process is characterized by an arrangement of injection nozzles which are provided in the supply circuit of the combustion air stream and is equipped with a pipe line around which the combustion air flows, whereby one end is connected to a supply container with the additive and the other end projects into a narrowing zone of the cross-section of the passage channel going into the furnace wall.
Additional advantageous designs of the process according to the invention and of the device are indicated in the sub-claims.
A preferred embodiment is explained in greater detail through the attached drawing.
The drawing shows a furnace wall 1 of a shaft or cupola furnace (not shown) at which the combustible is charged at the upper end of the shaft. The combustible travels through the pre-heating zone which is heated by the combustion gases and finally reaches the combustion zone below. In the combustion zone of the shaft, a series of feeding circuits are installed around the circumference, and the combustion zone is supplied through them with hot air. This hot air, which serves at the same time as an oxidation means, enters the combustion zone very rapidly, i.e.
REFERENCES:
patent: 3373981 (1968-03-01), Taubmann et al.
patent: 4250816 (1981-02-01), Angevine et al.
patent: 4635567 (1987-01-01), Haftke et al.
patent: 4655148 (1987-04-01), Winship
patent: 4665842 (1987-05-01), Bartsch et al.
patent: 4722287 (1988-02-01), Anderson et al.
Rietzscher Rolf
Rudolph Axel
Georg Fischer AG
Yuen Henry C.
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