JPS6042874B2 - Heat pipe heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat pipe type heat exchanger that introduces two fluids with different temperatures into two heat exchange chambers and exchanges heat with a heat pipe passing through both heat exchange chambers. It is.

In recent years, in view of the need for energy conservation, plans are being advanced for the use of heat from high-temperature waste gas or geothermal water in the steel industry, process industry, etc. Many attempts have been made to apply heat pipes to the heat exchanger, but since the waste gas and hot water often contain a large amount of various impurities, dust and scale adhere to the outer surface of the heat pipe of the heat exchanger. The heat transfer performance inevitably deteriorated due to dirt.

Conventionally, stove blowing using steam or the like is used to deal with this problem, but it is not easy to remove parts that are far from the blow nozzle or the back side of the heat pipe, and it is especially difficult to completely remove sticky scale. Ta. Such adhesion of dust and scale not only reduces heat transfer performance, but also accelerates corrosion of the outer surface of heat pipes depending on the substance, and is one of the biggest causes of impeding the promotion of waste heat utilization mentioned above. Ta. The present invention improves the conventional method by filling and retaining a certain amount of solid particles such as sand or metal balls in the heat exchange chamber of such a heat pipe type heat exchanger, and by rotating the heat exchange chamber horizontally. An object of the present invention is to provide a heat pipe type heat exchanger that eliminates the above-mentioned drawbacks and completely removes dirt on the outer surface of the heat pipe through a cleaning effect based on the tapping action of solid particles, thereby eliminating obstacles when utilizing waste heat. That is.

The present invention forms two heat exchange chambers by partitioning a cylindrical or truncated conical heat exchange chamber rotatably supported around a horizontal axis with a partition wall, and fluid can enter and exit each heat exchange chamber. A heat exchanger characterized in that a rotary joint is provided, a large number of heat pipes are passed through both heat exchange chambers, and one or both of the heat exchange chambers is filled and held with a certain amount of solid particles such as sand or metal balls. It is a pipe type heat exchanger.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained by way of example with reference to the drawings, in which heat exchange between high temperature waste gas and air (or water) is carried out.

A high temperature side exchange/heat chamber 4 is formed by the truncated conical mantle 3 and the partition wall 2.
and a low-temperature side heat exchange chamber 4' are formed, and the heat pipe 1 is fixed to pass through both heat exchange chambers.

As fluid conduits to both heat exchange chambers, inner cylinders 6, 6' and outer cylinders are arranged concentrically with respect to the horizontal axis, A-4. cylinder 5
, 5" are attached to the respective heat exchange chambers 4 and 4"? It is.
On the other hand, on the horizontal axis υ8-3, an inner cylinder 8.8" and an outer cylinder 7,7" forming a fixed cylinder are provided, and an inner cylinder 6, 8,6" and a small" , outer cylinder 5 and 7, 5″
and 7'' are rotatably and airtightly connected to each other via seals 10, 1'' and 9, 9''. That is, the rotating double cylinder and the stationary double cylinder form a fluid-tight rotary joint via a seal. The mantle 3 has tires 11,1
are installed on the rollers 12, 12'', and the main body is rotated in the direction of arrow R around a horizontal axis 14 by a drive device 13. As shown in FIG. 2, an appropriate amount of sand 14 of an appropriate particle size is held in the heat exchanger chamber 4. The grain size of the sand 14 is selected so that it will not be scattered by the flow rate of the high-temperature waste gas 16 passing through the baffle 15 fixed in the heat exchanger chamber 4, and the amount of sand packed is determined at each heat during tampling. The amount is selected so that all of the vibrator 1 can come into contact with the sand, and the amount does not flow out of the heat exchange chamber 4. A heat exchange chamber 4 is installed to prevent the sand 14 from dissipating and flowing out.
It will be more effective if a perforated plate 17 or a mesh is provided at the outlet portion passing through the outer cylinder 5 on the downstream side. In this case, the pore diameter of the perforated plate 17 does not necessarily need to be smaller than the grain diameter of the sand.
In the figure, 18 indicates the inlet of high-temperature waste gas, 19 indicates the same outlet, -20 indicates the inlet of air (or water), and 21 indicates the same outlet, which serve as fluid supply and discharge ports. Air (or water) enters the heat chamber 4, heats the heat vibrator 1, and is discharged from the outlet 19, and enters the low-temperature heat exchange chamber 4'' from the inlet 20, while passing through the 4 baffles 15''. It is heated by the heat vibrator 1 and discharged from the outlet 21. Eliminate and restore the time interval and the like where dirt accumulates on the external surface of the heat vibrator 1 and causes a substantial obstruction! The time interval to be obtained is set in advance in a timer, and the drive device 13 is started and stopped by automatic commands from the timer.

Due to the rotational movement of the heat exchanger chamber 4, the sand 14 is tampled as shown in FIG. Dust and scale on the outside are peeled off and finely divided into fine particles, which are discharged from the outlet 19 along with the waste gas.
Further, the dust is captured and collected by a dust collecting device 22 such as a cyclone. As another method of cleaning operation, a temperature detection/calculation device is installed at the outlet or inlet 18, 19, 20, 21 of the heat exchanger, respectively, and the reduction and restoration values of the average temperature difference based on the dirt on the outer surface of the heat vibrator are set respectively. Then, the drive device 13 may be started and stopped based on the command.

Continuous operation of the drive device 13 is undesirable as it causes more wear on the outer surface of the heat vibrator than necessary, but it is not preferable if the exhaust gas contains a significant amount of impurities and is sticky or corrosive. In some cases, it may be better to allow continuous rotation from an overall standpoint.

In this case, the rotation speed is selected to be slightly lower. The above explained the case of heat exchange between high-temperature contaminated waste gas and air (or water), but heat exchange between contaminated hot water containing silt and various metal salts and clean water, such as when using geothermal water, is also explained. is the same as above.

In this case, due to the specific gravity and viscosity of the thermal fluid, the solid particles filled in the heat exchange chamber 4 have a large particle size (about several millimeters) and are made of metal balls such as stainless steel. Contaminated hot water and clean water enter through inlets 18 and 20 and are discharged through outlets 19 and 21, respectively, and scales such as silt and precipitated metal salts that adhere to the outside of heat vibe 1 are removed by metal balls due to the rotational movement of heat exchanger chamber 4. Peeling and friction occur due to mutual collision and friction between the
It is finely divided and discharged along with the waste hot water. On the other hand, by selecting the mesh of the perforated plate 17 to be smaller than the diameter of the metal balls, the metal balls can be completely prevented from flowing out of the heat exchange chamber 4.
In the above explanation, we have explained the case where the contaminated fluid is only on the high temperature side, but there are also cases where scale adhesion occurs on the low temperature side, such as in the case of heat exchange between dust-containing high temperature exhaust gas and seawater. Of course, the outer surface of the heat vibrator can also be cleaned by filling the low-temperature heat exchange chamber 4'' with solid particles.

In this case, the material, particle size, etc. of the solid particles suitable for each fluid may be appropriately selected, and the cleaning time may be selected from the time required for each of the high and low temperature sides, whichever is longer. In the explanatory diagram of the embodiment, the heat exchange chambers 4, 4'' are shaped like a truncated cone, with the high temperature side having a large diameter, and the heat vibrator 1 is provided along this cone. When the heat medium (e.g. water) sealed in the vibrator 1 condenses and becomes liquid on the low temperature side, the condensed liquid moves to the high temperature side due to the centrifugal force effect as the heat vibrate rotates around the 6-3 axis. This is a consideration to make it easier to move around.

By taking such considerations into account, there is an advantage that the rotational movement for cleaning the heat vibration also benefits the heat transfer of the heat vibration 1 at the same time. Of course, the heat exchange chamber can be made cylindrical and the heat vibrator can be provided in parallel to the 4-3 axes. The present invention forms two heat exchange chambers by partitioning a cylindrical or truncated conical heat exchange chamber rotatably supported around a horizontal axis with a partition wall, and fluid can enter and exit each heat exchange chamber. In addition to providing a rotating joint, a large number of heat vibrators are passed through both heat exchange chambers, and one or both of the heat exchange chambers is filled with a certain amount of solid particles such as sand or metal balls, thereby eliminating various impurities. When exchanging heat between large amounts of high-temperature waste gas, hot water, etc., and air, water, etc., it is possible to prevent dust and scale from adhering to the heat vibration, which can prevent a decrease in heat transfer performance, and in some cases. In addition, it is possible to provide a heat-vib type heat exchanger that makes it possible to utilize waste heat even in areas where it is practically difficult to use conventional technology, as it also helps prevent heat-vib from corrosion. This has an extremely large effect in terms of energy conservation.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, with FIG. 1 being a longitudinal sectional view and FIG.
The figure is a cross-sectional view taken along the line XX. 1... Heat vibrator, 2... Bulkhead, 3
...Cover, 4,4" ... Heat exchange chamber, 5,5"
・・Outer cylinder, 6,6″ ・・Inner cylinder, 7,7″・
...Outer cylinder, 8,8" ...Inner cylinder, 9,9",
10,1 ``... Seal, 11,1 ``......
Tire, 12,12″...Roller, 13...
...Drive device, 14...Sand, 15...Baffle, 16...High temperature waste gas, 17...
Perforated plate, 18... Inlet, 19... Outlet, 20... Inlet, 21... Outlet, 22
・・・・・・Dust collection device.

Claims (1)

[Claims] 1 A cylindrical or truncated conical heat exchange chamber rotatably supported around a horizontal axis is partitioned by a partition wall to form two heat exchange chambers, and each heat exchange chamber is equipped with a rotating joint through which fluid can enter and exit. A heat pipe type heat exchanger characterized in that a large number of heat pipes are passed through both heat exchange chambers, and one or both of the heat exchange chambers are filled with a certain amount of solid particles such as sand or metal balls. vessel.