DE859549C - Heating device for pipes - Google Patents

Description

Heating device for pipelines Pipelines through which hot, easily solidifying liquids, such as B. molten pitch, be directed, are exposed to a high risk of freezing in the event of malfunctions. this can occur, for example, when the circulation of the hot liquid through any circumstance is interrupted. The goods then cool down despite good thermal insulation in the pipeline and finally solidifies, the solidified material having the pipe cross-section completely filled out. To put such frozen lines back into operation, you usually have to dismantle the lines piece by piece and the property # by knocking or chiseling remove from the inside of the pipe. It is known to have pipelines with a heating jacket to provide. However, such pipelines are expensive and take considerable time takes up more space than a, bodywork without a heating jacket. In addition, the heat consumption for Keeping a pipe very high from an outer jacket. A melting from the outside is because of. the poor thermal conductivity solidified heavy Good unflattering.

In contrast to this, the invention consists in arranging a continuous electrical heating element within the pipeline, possibly with a certain amount of supports attached to it. Keep the distance from the pipe wall, the inside of the pipe free. B. about 25 X 2 m'n cross-section can be formed. If the pipes are arranged vertically, these heating conductors can be earthed at the upper end or connected to the pipe body, but attached to support insulators at the lower end. The three bushing insulators supply low tensioned current which heats the heating conductors.

, Us Hei7, element, heating pipes can also be used in. which, resistance conductors are arranged in a suitable manner.

Finally, the heating elements can also take the form of pipes have through which steam or other heating means are passed, which is advantageous Openings in the tubular body for blowing rinsing steam or rinsing agents into the Inside of the pipe to be heated are provided. The heating tubes are preferred made of a comparatively easily flexible material.

In the drawing, in Dep. I is a longitudinal section through a, part a tube designed according to the invention and in Fig. 2 a cross section such a pipe is shown.

i is the metallic tubular body, in the interior of which, preferably centrally, a slightly flexible heating conductor2 is arranged. The pipe i is provided with a heat insulation 3 on the outside. interspersed, preferably in the longitudinal axis of the line.

By using the invention, there are significant advantages. 'If. Assumes that the material in the pipeline initially solidifies in the zones near the pipe wall, the core of the pipe filling remains at an elevated temperature for a much longer time because the heat transfer is made more difficult by the already solidified, poorly conductive material i ' . The supply of heat through the heating probe is therefore concentrated on the inner core of the line, which remains slightly liquid even if the outside is quite undercooled. When the liquid, oil-time circulation is restarted, a continuous flow channel is therefore present within the pipe. from which the solidified mass in the outer layers can be melted again relatively quickly.

The risk that the pipe crosses the pipe when heated outside at some point again due to parts of solid or plastic material becoming detached is blocked again, is avoided in the heating device according to the invention. It can only after melting of almost the entire pipe cross-section of the pipe wall individual thin, - flat cakes abl; 3si2n, those of your at higher temperature held core of the pipe filling easily melts in whole or in such parts to be brought. that constipation is impossible.

Another advantage of the subject invention is that the formation of crusts that may occur in the event of local overheating the heating surfaces can be easily removed because it is in the middle of the pipe Set up freely arranged heating element removable without dismantling the pipes and can then clean, in contrast to the behavior of pipes with Außenbeheizim, -, which in this case have to be dismantled, drilled out and knocked out.

Finally, the thermal insulation on pipes is also according to the invention Much easier and safer to install because there are no gaps between them Heating device and the supply and discharge of the heating medium to be provided to need. As a result, the outer surface is smaller and therefore also the radiation loss and the risk of freezing # s lower.

Claims (2)

PATENT CLAIMS: i. Heating device for pipelines that are filled with liquid pitch or a similar, slightly solidifying material, characterized in that an electrical heating element (2-1 is arranged centrally in the pipe interior, preferably in the center). 2. Device according to claim i, characterized in that the heating element (2) is supported on the inner pipe wall 21 with supports attached thereto. - 3. Device according to claim i or 2, characterized in that a plurality of heating elements are arranged in the pipe interior.