Heating – Tumbler-type rotary - drum furnace – Having brick-type lining
Patent
1996-05-08
1998-01-06
Bennett, Henry A.
Heating
Tumbler-type rotary - drum furnace
Having brick-type lining
432103, 432105, F27B 728, F27B 714
Patent
active
057047820
DESCRIPTION:
BRIEF SUMMARY
This Appln is a 371 of PCT/NL94/00291 filed Nov. 17, 1994 to first sentence of specification.
FIELD OF THE INVENTION
The present invention relates to a wear lining for a rotary furnace of an incineration installation for chemical waste, wherein the wear lining comprises tapered bricks which are installed in the furnace in the form of a vaulted lining, the main taper of each brick being matched to the desired vaulted lining shape, and wherein the height of the bricks extends in the thickness direction of the lining, in which the bricks have an additional taper which extends at least over part of the height thereof, which additional taper provides, on the inside of the lining, an increase in the gap width between adjoining bricks which decreases towards the outside of the lining.
BACKGROUND OF THE INVENTION
As a consequence of the very rapid growth in the chemical industry, both in respect of the quantities produced and in respect of the variety in the types of products, the treatment of chemical waste has grown to be an appreciable problem for society. In order to provide a solution to this problem, amongst other things incineration installations for chemical waste have been developed.
In the context of the present invention, "chemical waste" is defined both as material in solid form and as material in liquid or paste-like form, or mixtures of solid and/or liquid and/or paste-like materials.
Inclined rotary furnaces are frequently used for the incineration of, in particular, chemical waste. With these installations, the chemical waste is fed to an inclined rotary furnace at the high end, after which it is exposed to a temperature of between 850.degree. C. and 1350.degree. C. in the rotary furnace. The rotary furnace issues into a post-combustion furnace, in which a temperature of between 850.degree. C. and 1300.degree. C. prevails. The resulting gas, solid and/or liquid mixture is then subjected to a number of treatments known from the prior art, such as, inter alia, separation, cooling and washing. In this context, the process conditions and dimensions of the installation are dependent of the nature of the waste, on the desired capacity and on requirements laid down by governmental authorities.
The wear lining of the rotary furnaces is subjected to severe stresses in incineration installations of this type. As a result of the high operating temperatures, the material of the lining expands and high internal material stresses arise on the inside of the lining as a consequence of compressive forces. As a consequence of these high internal stresses, the bricks from which the lining is made have a tendency to crack and/or splinter. This cracking and/or splintering is, furthermore, also appreciably promoted because the load in the furnace is chemically highly aggressive and of differing composition. Moreover, the rotating furnace is subjected to severely fluctuating thermal and mechanical stresses, which vary according to time and location, and this has a further adverse effect on the life of the wear lining.
In conventional rotary furnaces, the diameter varies between 2.5 and 5 meters, whilst the length can be 10 to 15 meters. The furnace is frequently provided with two race rings and a drive ring, which also serve as reinforcing rings. As a consequence thereof, the steel jacket of the furnace can undergo thermal deformation to differing extents in different locations under the influence of the effect of temperature and can also be subjected to fluctuating mechanical stresses during rotation with the moving load.
As a consequence of the severe attack on the wear lining under the influence of all of these factors, the wear lining has to be replaced regularly, which gives rise to high costs and also reduces the availability of the furnace.
In order to prolong the life of the wear lining it is known to insert a felt-like layer between the wear lining and the steel jacket of the furnace. This felt-like layer is able to absorb the expansion of the wear lining caused by the high operating temperatures and thus
REFERENCES:
patent: 2180969 (1939-11-01), Seil
patent: 3343319 (1967-09-01), Reintjes
patent: 3343824 (1967-09-01), Schneider
patent: 3346248 (1967-10-01), Martinet et al.
patent: 3362698 (1968-01-01), Cerny et al.
patent: 3380211 (1968-04-01), Snellman
patent: 3593476 (1971-07-01), Hodl
Butter Johannes Adrianus Maria
Schulze Joachim Otto
Bennett Henry A.
N.V. Gouda Vuurvast
Wilson Gregory
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