Gas separation: processes – Heat exchanging – Condensing to solid
Patent
1995-03-31
1996-10-29
Bushey, C. Scott
Gas separation: processes
Heat exchanging
Condensing to solid
55269, 55289, 55290, 55296, 55353, 55446, 96190, 96199, 425 74, 425 75, 454 61, B01D 900
Patent
active
055693156
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a process and a device that accommodate cleaning the waste air of systems that accommodate the solidification of melts, which melts are deposited on cooling surfaces, in particular a cooling conveyor and harden there, especially systems for solidifying sulfur.
It is well-known that a series of products, such as resins, adhesives, or the like, but also sulfur can be made transportable and handlable by melting them and depositing them either in strips or in the form of drops on a moved cooling belt, where the melt hardens. If said melt is deposited as drops, the result at the end of the cooling belt is a granulate that can be packaged. If deposited as strips, said strips break into pieces and can also be packaged.
Since vapors, which can be environmentally endangering, are produced when the melt is deposited, in particular in the case of sulfur, it is customary to use suction devices which ensure that the resulting waste air is removed and cleaned in a defined manner. The cleaning is done with the aid of filters, which are relatively expensive. There is also the specific drawback with the known cleaning process that the amount of dust that is removed with the waste air is lost to the production of the product.
SUMMARY OF THE INVENTION
The invention is based on the problem of designing a process and a device of the aforementioned kind in such a manner that a smaller amount of the product gets into the waste air so that the burden is taken off of the cleaning process that takes place there.
To solve this problem, the process of the invention proposes that a portion of the product produced as vapor behind the feed point of the melt is removed by crystallization prior to the removal of the waste air and is removed as a solid component. With this measure it is possible to avoid a large portion of the by-product that is produced otherwise as dust and under some circumstances to use the crystallized output again for processing the melt. In so doing, in an improvement of the inventive idea the size of the crystallization surfaces provided for the crystallization process are adapted to the vapor pressure profile over the product, so that where higher vapor pressure prevails, there is also the possibility of depositing larger quantities of the product in the form of crystals on the surfaces.
To implement the new process, a device with a suction hood, which is arranged over a cooling belt and which covers a feeder for the melt and exhibits a suction fitting, can be provided. In the region between the feeder and the suction fitting the hood is provided with installations, which project into the waste air flow and are intended for the crystallation of the product and in the region of the installations said hood is provided with regulatable openings for producing a specific air flow. This design allows the flow rate of the waste air in the region of the installations to be chosen in such a manner that there is adequate time for the crystallization at the installations. At the same time the installations can be designed in an especially simple manner as walls that are arranged in the manner of a labyrinth at right angles to the waste air flow. Therefore, the waste air flow is forced to flow along the walls and in particular at a defined velocity, so that the desired crystallation occurs. To promote the crystallization process, the walls can also be made of heat conductive material and provided with channels for the passage of a thermostatable heat exchange medium or, whose temperature can be stabilized in some other manner. In this manner it is possible to design the temperature of the crystallization surfaces in such a manner that the conditions are optimal for crystallization.
To achieve an adaptation to the vapor pressure profile over the product, the walls can be parallel and at different intervals in the direction of flow; said intervals being adapted to the vapor pressure profile over the product. The walls can project vertically beyond the hood cover into the
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2029 Chemical Engineering, vol. 90, No. 2 (Jan. 21, 1983), pp. 55, 57.
K onig Axel
Kleinhans Matthias
W urmseher Herbert
Bushey C. Scott
Santrade Ltd.
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