Drying and gas or vapor contact with solids – Apparatus – With means to treat gas or vapor
Patent
1984-11-07
1987-03-31
Schwartz, Larry I.
Drying and gas or vapor contact with solids
Apparatus
With means to treat gas or vapor
34 86, 34213, 34216, F26B 328
Patent
active
046531980
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a plant for drying animal or vegetable material, comprising apparatuses for two-stage or multi-stage heat treatment, preferably separate apparatuses for successive heat treatment of the material.
It is well known within various branches of industry to employ waste heat from a first heat treatment apparatus--in the form of recompressed exhaust steam--in a subsequent heat treatment apparatus. In known process techniques the waste heat is usually employed in the form of impure exhaust gas or impure process exhaust steam, and such known, secondary heat medium as a consequence of the impurities in the exhaust steam or exhaust gas from the first heat treatment apparatus place special material technical demands on compressor(s) and on remaining process apparatus for the said subsequent heat treatment apparatus. These special demands involve complicated and expensive apparatus.
The main object of the plant according to the invention is to obtain a possibility for employing compressors and other apparatus which is simple and inexpensive in procurement as well as in use.
The plant according to the invention is characterised in that a heat medium which is used in a second heat treatment apparatus, which follows a first heat treatment apparatus, consists of uncontaminated water/steam which is circulated in a closed circuit, that is to say separated from the heat medium of the first apparatus and from the treatment material of the second apparatus. The closed circuit extends from heat exchanger surfaces, which are supplied with heat energy from the exhaust gas/exhaust steam from the first apparatus, via heat surfaces in the second apparatus back to the heat exchanger surfaces. The closed circuit includes one or more steam compressor(s) in order to bring in a manner known per se the heat medium of the circuit up to the process steam pressure before it is supplied to the heat surfaces of the second apparatus.
By employing a secondary heat medium circuit, based on uncontaminated water which is circulated in a closed circuit, the problems with the impurities in the exhaust steam or the exhaust gas from the first heat treatment apparatus are avoided. Thus, equipment of conventional construction materials, such as soft steel, can thereby be employed in the second apparatus. In other words, corrosion of the material can be avoided at the surfaces which are only exposed to uncontaminated water and uncontaminated water vapor, respectively. In addition, such process-associated disturbances are avoided which are due to carried along particles, carried along impure fluid drops, scum formations, and the like.
Even if the plant requires extra energy for operating a pump and compressor in the closed circuit, operatively economic favorable results are obtained as a consequence of the advantages of using uncontaminated water/steam in the closed circuit.
The invention will be further described in the following description having regard to the accompanying drawing, which illustrates a process diagram according to the invention.
The plant according to the invention, as illustrated in the accompanying drawing comprises two heat treatment apparatuses 1 and 2. By broken lines there is shown, respectively, a feed conduit 3 for the material which is to be treated in the apparatus 1, a transfer conduit 4 for the material between the apparatus 1 and the apparatus 2 together with a discharge conduit 5 from the apparatus 2 for the material. If desired, there can be present in series with the apparatus 2 or in series with the apparatus 1 one or more additional apparatuses (not shown further). The apparatus 2 and possible further apparatuses effect heating of the material or portions of the latter by means of waste heat from the apparatus 1.
The two heat treatment apparatus 1, 2 are thus connected in series relative to the flow of the material to be treated. In addition, a conduit 6 extends from the upstream heat treatment apparatus 1 for exhaust gas or exhaust steam or a mixture of exhaust gas and exhaust steam from
REFERENCES:
patent: 2622342 (1952-12-01), Goulounes et al.
patent: 4223452 (1980-09-01), Chambers
patent: 4231165 (1980-11-01), Gresens et al.
patent: 4255870 (1981-03-01), Malmquist
patent: 4312136 (1982-01-01), Bahner et al.
patent: 4490924 (1985-01-01), Lambert
Schwartz Larry I.
Stord Bartz A/S
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