JPH09104877A - Heat exchanger for liquefied petroleum gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of preventing stickiness of a heavy component while making the best of advantages of conventional coiled pipe or saving type heat exchangers by one apparatus. SOLUTION: This heat exchanger for a liquefied petroleum gas comprises a coiled pipe 1 arranged in the interior of a warm water tank 3 to be heated by a heater and a chamber column 2 connected to an outlet of the coiled pipe. A heat exchange part of the coiled pipe has such a heat transfer area as not to completely evaporate an LPG liquid, and an unevaporated LPG liquid is evaporated in the chamber column 2. Or, the objective heat exchanger for a liquefied petroleum gas comprises a coiled pipe and a chamber column connected to an outlet of the coiled pipe. A part of an LPG liquid introduced to the coiled pipe is evaporated there and an unevaporated LPG liquid is evaporated in the chamber column.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to liquefied petroleum gas (L
The present invention relates to improvement of an evaporator in a heat exchanger for P gas).

[0002]

2. Description of the Related Art There are mainly two types of evaporators used conventionally. One is a configuration in which the LP gas liquid is completely vaporized and superheated by a flash evaporation type spiral tube, and the other is a configuration in which the LP gas solution is stored in the chamber without adopting the spiral tube and heated and boiled to evaporate. It is a type.

[0003]

Among the above-mentioned conventional examples, the former configuration using the flexible tube can be downsized for its capability and can be superheated so that it is efficient. Further, since a large amount of LP gas liquid is not stored inside the heat exchanger, there are advantages that the safety is high and there is almost no pulsation of the generated gas pressure. On the other hand, when the LP gas contains heavy components, it may stick to the inside of the flexible pipe, lowering the heat exchange capacity, and if worse, blocking the internal passage. Further, there is a drawback that a large amount of heat is required to be supplied to the heat source for superheat.

In the latter case, a large heat source is not required, so that labor can be saved. Further, even if the LP gas contains a heavy component in order to always maintain a wet state, the internal portion can be saved. It has the advantage of not sticking to the passage. On the other hand, the heat efficiency is lower than that of the former, and when a large amount of heat exchange is required, the device becomes large, which increases the cost and at the same time increases the installation space. In addition, there is also a problem that stable supply cannot be performed when the gas generation pressure pulsates due to heating and evaporation and the load changes abruptly. Furthermore, a safety measure is required to store a large amount of LP gas liquid in the chamber. Moreover, there is also a problem that a large amount of LP gas liquid is entrained and released into the atmosphere during the work of removing heavy components.

The present invention was developed in view of the above conventional problems, and an object of the present invention is to provide a heat exchanger capable of complementing the drawbacks while utilizing the respective advantages of the prior art with one device. And

[0006]

In the present invention, in order to achieve the above object, a flexible tube provided inside a hot water tank heated by a heater, and a chamber tube continuously provided at an outlet of the flexible tube. The heat exchange portion of the flexible tube has a heat transfer area such that the LPG liquid does not completely evaporate, and means for evaporating the non-evaporated LPG liquid in the chamber cylinder is used. The heat transfer area here is determined by the thickness and length of the flexible tube and affects the heat exchange efficiency.

Further, the LPG liquid introduced into the above-mentioned flexible pipe is partially evaporated by the flexible pipe which is provided inside the hot water tank heated by the heater and the chamber cylinder which is continuously provided at the outlet of this flexible pipe. In addition to the above, a means of evaporating the unvaporized LPG liquid in the chamber cylinder is also used.

[0008] Since it is relatively difficult to clean the inside of a spiral tube composed of a spiral curved tube, it is possible to superheat and completely evaporate the spiral tube, but the heat exchange rate is very good.
Heavy components are scorched or sticky. However, in the present invention,
In the flexible tube, the LPG liquid is not completely evaporated but only a part thereof is evaporated, so that the tube wall is constantly kept in a wet state, and clogging of heavy components is avoided. By complementarily evaporating the non-evaporated LPG liquid in the chamber cylinder, a decrease in the heat exchange rate is avoided in combination with both.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2 are a front view and a side view showing the present embodiment, in which 1 is a flexible tube, 2 is a chamber body, 3 is a hot water tank, and 4 is a hot water heater. Snake 1
Is supplied with LPG liquid from one side 1a, and the other outlet 1b is connected to the chamber body 2. 5 is the chamber body 2
Is a gas outlet pipe, and 6 is a gas outlet flange. Reference numeral 7 is a protective tube, which has a known structure in which a temperature detector for controlling the temperature of the hot water tank 3 is provided by a thermostat or a thermovalve.

In FIG. 3, the total length of the flexible tube is shorter than that of the first embodiment, and other structures are the same as those in FIGS. 1 and 2.

In this embodiment, as compared with the conventional flexible pipe,
In addition to shortening the overall length, the inner diameter was increased. With this configuration, the heat conversion efficiency is lower than that of the conventional flexible tube type heat exchanger, but since the inside of the pipe is kept wet by that much, it is possible to prevent the heavy components contained in the LPG liquid from being concentrated. As a result, the tar content does not adhere to the wall surface of the pipe. Therefore, it is not necessary to frequently clean the inside of the pipe, and the moving efficiency is rather improved. Note that, in the present embodiment, the evaporation rate planned for the flexible tube of FIG. 1 is about 60 to 70%.
It is. This ratio is not strict, but if the evaporation rate is too high, it will not be possible to avoid heavy components remaining in the tube, but if it is too low, the heat exchange rate will be too low and sufficient heat recovery will be performed. Because you can't. Needless to say, the determination of the evaporation rate depends on factors such as the thickness of the flexible pipe and the length of the pipe passing through the hot water tank. That is, when the flexible tube of FIG. 3 is adopted, the evaporation rate is lower than that of FIG.

Next, after the LPG is evaporated to some extent in the above-mentioned flexible tube, the flexible tube outlet 1b is used to transfer the L
The LPG liquid is introduced together with the PG gas. Then, the already-evaporated LPG gas flows into and passes through the inside of the chamber body 2, and at the same time, the remaining un-evaporated LPG liquid flows in and accumulates at the bottom. However, since the amount of this LPG liquid is small, Even the chamber body 2 having poor exchange efficiency can be easily evaporated. As a result, the LPG liquid introduced into the flexible pipe 1 partially evaporates when passing through the flexible pipe 1, and the non-evaporated LPG liquid evaporates inside the chamber body 2,
The LPG gas is output from the gas outlet pipe 5 through all the flow paths. Then, not only the chamber body 2 but also the flexible tube 1 is constantly kept in a wet state.

[0013]

According to the present invention, the heat exchange by the flexible tube and the chamber cylinder is adopted at the same time, and the un-vaporized LPG liquid is complementarily evaporated by the flexible tube in the chamber cylinder. It was possible to avoid the sticking of heavy components to the pipe wall, while at the same time maintaining the heat exchange rate in combination with both, making it possible to have a structure that is small, efficient, and easy for maintenance and inspection.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional front view showing an embodiment of a heat exchanger of the present invention,

FIG. 2 is a side view of the same;

FIG. 3 is a side view showing another embodiment.

[Explanation of symbols]

 1 Snake pipe 2 Chamber body 3 Hot water tank 4 Hot water heater 5 Gas outlet pipe 6 Gas outlet flange 7 Protective pipe

Claims (2)

[Claims] 1. A flexible pipe, which is provided inside a hot water tank heated by a heater, and a chamber cylinder which is continuously provided at the outlet of the flexible pipe. The heat exchange portion of the flexible pipe is L.
A heat exchanger for liquefied petroleum gas, characterized in that the heat transfer area is such that the PG liquid does not completely evaporate, and the non-evaporated LPG liquid is evaporated in the chamber cylinder. 2. An LP, which comprises a flexible pipe provided inside a hot water tank heated by a heater, and a chamber barrel which is continuously provided at an outlet of the flexible pipe and which is introduced into the flexible pipe.
A heat exchanger for liquefied petroleum gas, characterized in that part of the G liquid is evaporated and the LPG liquid that has not been evaporated in the chamber cylinder is evaporated.