JPS5813987A - Heat transmitting device - Google Patents

Abstract

PURPOSE:To increase a pressure resisting force and facilitate to effect the cleaning thereof by a method wherein a heat transmitting tube module, in which the bare tubes are punched by flat plates and secured to form it, is utilized. CONSTITUTION:The heat transmitting tube module 1 is made of a carbon steel or a stainless steel, and the bare tubes 2, 2', 2'' are arranged in parallel in a single row so as to pinch them by two sheets of the flat plates 3, 3' while they are secured by seam weldings along the positions of the opposing tangential lines 4, 4' to form them like as a flat plate. Each bare tubes are connected each other among the flat plates so as to flow a fluid therethrough a zigzag and the outlets and the inlets thereof are provided with headers. Respective modules 1, 1', 1'' are divided each other by paths 6, 6' and a plurality of them are connected to form the heat transmitting device while the paths 6, 6' are arranged in a flue so as to be located in parallel with the flow of waste gas. The flue gas passes through the smooth paths 6, 6' and, therefore, soot and ash contained therein will not be adhered the plates easily and the cleaning thereof is easy even if a little amount thereof of them are adhered thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat transfer device that is effective in reducing contamination during heat exchange such as waste heat recovery, can introduce high-pressure fluid, and is resistant to corrosive gases.

In general, when diesel engines use high-quality fuel oil, the exhaust gas is relatively clean, but in recent years, due to the tight oil situation, the heavy content and sulfur content have increased, and the quality has deteriorated. Exhaust Gas Economizer 9 The exhaust gas side of the heat transfer tube bundle in waste heat boilers and the like is becoming increasingly contaminated, resulting in unfavorable conditions such as reduced heat transfer efficiency and increased corrosion. In extreme cases, there is a risk that the medium may cause dust to dry out. Also glass for corrosion resistance.

It is possible to use a heat transfer tube such as a carbide, but this poses a problem in terms of strength.

Conventionally, heat transfer devices used in economizer 2 waste heat boilers, etc. have either used bare tubes as they are, or have had many fins installed at narrow intervals to improve heat transfer, or have fins arranged in a spiral shape. A finned tube with fins wrapped or welded vertically in the longitudinal direction, or a flat plate heat exchanger are used. Among these, heat exchangers using tubes are particularly troublesome to clean when they become dirty, but on the other hand, they have the advantage of being able to withstand high pressure, so they can be used in high-pressure equipment, and flat plate heat exchangers have a low pressure resistance. Each type has its own characteristics, such as superior cleaning ability. The present invention combines the advantages of the tube-based heat exchanger and the flat plate heat exchanger, and focuses on the reliability of operation management, which is pressure resistant, easy to clean, and can be operated continuously for a long time. It was done by

The heat exchanger tube module 1 shown in FIG. 1 is made of carbon steel or stainless steel. For example, a plurality of bare tubes 2, 2', 2" with a diameter of 10111111 are arranged in a single row in parallel, and two flat plates 6, 3 are arranged in parallel. ' holds the bare tube, and as shown in Figure 2, the opposing cutting lines ffi, 4.4' are seam-welded and fixed to form a flat plate.Each bare tube is bent between the flat plates, and an inlet/outlet Helagoos 5 and 5' are provided at the upper and lower ends of the parallel flat plates. Smooth tip sealing parts 7. It is also possible to form a sealed structure between the flat plates.Furthermore, it is also possible to fill this sealed structure with a heat medium to further improve heat transfer.

material or copper.

In the case of aluminum, brazing or the like may be used.

Note that fixing the bare tube and the flat plate is not limited to welding or brazing.

In such a female-shaped heat exchanger tube module, as shown in FIG. A heat transfer device is formed by connecting the passages 6, 6'...
is installed in the flue (not shown) in a position parallel to the flow of waste gas. Therefore, the flue gas in the direction of the arrow passes through the smooth passages 6, 6', etc. Even if the flue gas is dirty, the medium and ash are difficult to stick to the flat plate, and even if some adhere to it, it can be cleaned. It is easy to use bare tubes 2 and 2'.

2'' is covered with flat plates 3 and 6', so heat transfer efficiency is sacrificed to some extent, but long-term continuous operation is possible, and reliability more than compensates for the decrease in heat transfer efficiency.

Since the present invention is a heat transfer device comprising a heat transfer tube module fixedly formed with a flat plate in between, it has the advantages of a heat exchanger using tubes and a flat plate heat exchanger, and high pressure fluid can be introduced into the tubes. The usable axis 1j4J can be greatly expanded compared to the conventional flat plate heat exchanger, and for example, a high-pressure exhaust gas boiler can be economically produced. Furthermore, even if the boiler is installed in waste gas, a flat plate with no irregularities on its surface will not allow medium, ash, etc. to settle or settle, and since bare pipes do not come into direct contact with external fluid, there is no need to consider corrosion resistance. For example, waste heat can be recovered by installing the waste incinerator in a waste incinerator gas containing acid. Moreover, it can be used not only for heat recovery purposes, but also for exhaust/azusa heaters that introduce high-temperature fluid into bare pipes to heat cooled waste gas and prevent condensation of sulfuric acid and hydrochloric acid in the gas. If coating is required, it can be applied to a flat plate, which is easier than coating conventional narrowly spaced fin tubes such as Teflon coating, as well as coating uneven flat plate heat exchangers.

On the other hand, regarding heat transfer, in the heat transfer tube module, there is a line contact between the bare tube and the flat plate, so a decrease in heat transfer efficiency can be avoided.
Heat transfer efficiency can be improved by filling the interior with a heat medium as a sealed structure, and as there is less dirt as mentioned above, the interval between cleaning due to dirt can be significantly extended over a long period of time, allowing continued operation for a long time. This more than compensates for the decrease in thermal efficiency, operation management is easy and reliable, and even if it gets dirty, the flat plate is smooth and easy to clean.

As described above, the present invention is effective against contamination of heat transfer devices, and is also effective in handling high-pressure fluids! : can be done,
Furthermore, it can be used for corrosive gases, so it has a wide range of applications, such as diesel engine waste heat boilers, economizers for industrial waste combustion furnaces, economizers for existing land boilers, attached water heaters, and waste incinerators. It can be used in flue gas heaters, heat recovery from high-temperature corrosive cloth gas, and has great effects.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a perspective view of a heat exchanger tube module, Fig. 2 is an explanatory diagram showing the welding points between a bare tube and a flat plate, and Fig. 3 is an illustration of the arrangement d of the heat exchanger tube module. Explanation 1
It is a diagram. 1... Heat exchanger tube module 2, 2', 2''
...Bare tube 6.5'...Flat plate 4,4'
... Cut line position 1a5.5' ... Entrance/exit
6, 6'...Passage 7...Tip sealing part Patent applicant Sasakura Machinery Co., Ltd.

Claims (1)

[Claims] A heat transfer device comprising a heat transfer tube module in which a bare tube is sandwiched and fixed between flat plates.