Textiles: fluid treating apparatus – Machines – With gas – steam or mist treating
Patent
1994-05-06
1996-01-02
Coe, Philip R.
Textiles: fluid treating apparatus
Machines
With gas, steam or mist treating
68 6, 162249, 162250, 162272, D21C 102
Patent
active
054797926
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to arrangements for heating material being conveyed through a pipe. More particularly, the present invention relates to arrangements or apparatus for heating material, preferably consisting of fibrous material in the form of a cellulosic pulp, as it is being conveyed through a pipe. Still more particularly, the present invention relates to such apparatus in which the heating medium is steam.
BACKGROUND OF THE INVENTION
In many instances it is necessary to heat a cellulose pulp for various purposes, such as to initiate and/or to continue different chemical reactions and treatments. This applies, for example, to many bleaching steps. In order to ensure this heating, steam of different pressures is generally used, depending upon the pressure level required by the process in the particular installation in question.
Heating of the pulp with steam preferably takes place in a pipe which is conveying the pulp to the treatment step in question. The pulp concentration can be from about 3 to 20%, and preferably from about 5 to 15%. In this manner, a relatively rapid and uniform heating of the pulp can be achieved. The steam is normally supplied through one or more steam pipes which are connected to the pulp pipe. Such so-called steam extension pipes connected to the pipe system can be designed in various ways, whereby the resultant temperature increase of the pulp can vary, and the functioning of subsequent machines will be more or less efficient.
In earlier systems or arrangements, problems have often arisen in view of the development of large steam bubbles on the inside of the pulp pipe. When these steam bubbles rapidly condense, condensate stresses and bangs occur, which cause harmful cavitations both in the pipe system itself and in surrounding components. Furthermore, it is difficult to achieve an entirely uniform temperature profile in the pulp. It is certainly possible to improve the temperature profile by inserting the steam pipes into the pulp pipe, but doing so will cause a considerable deterioration in the flow within the pulp pipe, as well as difficulties in cleaning the pulp pipe and steam pipes in case of plugging.
The aforesaid problems are solved by the present invention. As a result of this invention, the steam heating can take place effectively and uniformly since the steam is exposed to a large volume/surface of the passing pulp flow. Furthermore, the steam is supplied without any condensate bangs and without interfering with the pulp flow. The arrangement according to the present invention is also designed so that it can be easily cleaned when plugging of pulp takes place.
SUMMARY OF THE INVENTION
In accordance with the present invention, these and other objects have now been achieved by the invention of apparatus for heating fibrous material being conveyed through a pipe comprising a plurality of fitting members mounted on the outer surface of the pipe and extending along the outer surface of the pipe for a predetermined distance, and a corresponding plurality of steam pipes, each of the plurality of steam pipes being connected to each of the plurality of fitting members whereby steam is supplied to each of the plurality of fitting members, the pipe including a plurality of apertures at locations corresponding to each of the plurality of fitting members whereby steam can pass into the pipe therethrough.
In a preferred embodiment, the fibrous material is a cellulosic pulp.
In accordance with one embodiment of the apparatus of the present invention, each of the plurality of fitting members is disposed in the form of a helical curve on the outer surface of the pipe. In a preferred embodiment, the plurality of fitting members extend about the entire circumference of the pipe.
In accordance with one embodiment of the apparatus of the present invention, the plurality of fitting members have a semicircular cross-section. In another embodiment, the plurality of fitting members extend along the outer surface of the pipe at a predetermined angle w
REFERENCES:
patent: 1403126 (1922-01-01), Lyth
patent: 1807544 (1931-05-01), Morterud
patent: 2809111 (1957-10-01), Durant et al.
patent: 3293119 (1966-12-01), Richter
patent: 3319275 (1967-05-01), Fleissner
patent: 3328131 (1967-06-01), Latham, Jr.
patent: 3680334 (1972-08-01), Erickson et al.
Berg Bertil
Johansson Ralph
Coe Philip R.
Sunds Defibrator Industries Aktiebolag
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