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Heating system for conveyor pipes
| Details |
Inventors: Kida, Masahiro; Kashiwagi, Akio; Nakanishi, Junji; Sato, Tominori; Ohmura, Masahiko; Nakamoto, Masahiro; Maruoka, Masakazu; Takata, Mashashi;
Assignee: Osaka Gas Co., Ltd. (Osaka, JP); Miyawaki Incorporated (Osaka, JP); Mitsubishi Cable Industries, Ltd. (Amagasaki, JP)
Primary Examiner: Chambers; A. Michael
Assistant Examiner:
Attorney, Agent or Firm: Armstrong, Westerman, Hattori, McLeland & Naughton
A long heating pipe is laid along a conveyor pipe and in contact with the outer surface thereof. The heating pipe is provided with an outer tube which has an operating fluid hermetically contained therein, and a steam tube which is inserted through the outer tube. A container is provided to accumulate condensation created as a result of the liquefaction of vapor fed through the steam tube of the heating pipe. This container has a temperature sensing valve located therein. The temperature sensing valve is closed if the condensation within the container more rises in temperature than predetermined, and this valve is opened if the condensation within the container more decreases in temperature than predetermined. This temperature sensing valve is communicatively connected to the downstream side end portion of the steam tube of the heating pipe, which is inserted into the container. |
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DETAILED DESCRIPTION The present invention relates to a heating system for conveyor pipes which transport through them fluid such as a heavy oil or the like.
In general, a heavy oil or other similar fluid which has solidifiability, or viscosity increasing property under a low temperature, and undergoes thermal decomposition or other chemical phenomenon at a high temperature deteriorates in fluidity thereof in the winter season in which an atmospheric temperature is lower, because it is increased in the viscosity thereof.
Therefore, in order to allow such a fluid to be smoothly conveyed through a conveyor pipe under a lower atmospheric temperature, provisions are made to heat the pipe, thereby decreasing the viscosity of the fluid which tends to increase.
In a conventional heating system for conveyor pipes, the steam-trace heating method is executed by using a trap.
The steam-trace heating method is available as two types.
One of these two types is that a heating pipe is installed, and it is only formed with a steam layer therein to use the latent heat of the steam for heating the conveyor pipe, and the other is that a condensation layer is allowed to stay within the separately installed heating pipe, thereby utilizing the sensible heat thereof as well as the latent heat of the steam which is allowed to exit in the form of a layer.
However, in the former type heating method in which a steam layer is only formed within the heating pipe to use the latent heat of the steam, overheating is locally introduced on the contact surfaces of the heating pipe and the conveyor pipe with each other, or the heat to the conveyor pipe is excessively great in quantity, whereby it is difficult that the heating temperature to the conveyor pipe is held to a suitable range.
Also, the latter type heating method in which a condensation layer is allowed to stay in the heating pipe, the condensation layer is subjected to a temperature gradient on the downstream side thereof, and therefore, it is substantially impossible to know a total of precise quantity of heat given to the conveyor pipe
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