JPH1130443A - Waste heat recovery device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out the recovery and re-utilization of waste heat by a method wherein waste heat from the flue of a boiler is transferred through sand and a heat pipe to effect heat exchange between outdoor air. SOLUTION: A heat recovery unit M, mounted in the flue A of a boiler, is constituted of a hot-air passage (a), a heating unit (b), a heat transfer unit (c) and a heat exchanging flow passage (d). Hot air from the flue A of the boiler for heating a vinyl house and the like flows the lower end of an outer case 1 into lateral direction after hitting a baffle plate and passes the hot-air passage (a) through a communicating hole 5 to heat a case, filled by sand 7, while the heated sand 7 heats a heat pipe 8 while developing far infrared ray effect and the internal space of an inner case 2 is heated by the heat pipe 8. In this case, a heat exchanging flow passage (d) is formed in the inner case 2 and, therefore, heat exchange of the heat from the heat pipe 8 is effected here and inflow air from an air inflow duct 9 is heated whereby hot air is taken out of a hot air outflow duct 10 and is utilized again to heat the vinyl house and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an exhaust heat recovery apparatus.

[0002]

2. Description of the Related Art Conventionally, for example, as a heater in a greenhouse, a device for sending heat from a boiler to a greenhouse through a pipe is generally used.

[0003]

However, since these heaters do not effectively utilize the exhaust heat from the boiler, the loss of fuel consumption and the like is large and uneconomical, and the exhaust heat from the boiler is uneconomical. There has been a demand for a method of recovering the same.

[0004]

According to the present invention, a heat recovery unit is mounted on a flue of a boiler, and the heat recovery unit is provided with a hot air passage formed between a cylindrical outer case and a cylindrical inner case. When,
A heating section formed by storing sand, ceramic particles, etc. in the inner bottom of the inner case, a heat transfer section in which the lower part of the heat pipe contacts the heating section inside the inner case, and an outer case formed by the heat transfer section. It is an object of the present invention to provide an exhaust heat recovery device including a heat exchange passage for taking in air from outside and exchanging heat in a heat transfer unit to recover heat.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, for example, a heat recovery section is mounted on a flue of a boiler installed for heating a greenhouse. In the heat recovery section, hot air from the flue is heated. Heated to the hot air passage, heated the outer wall of the inner case and the heating section containing sand etc., heated the heat pipe of the heat transfer section, and the heat from the heat pipe was exchanged in the heat exchange section and the recovered heat was taken out By returning to the greenhouse again, the heating efficiency in the greenhouse can be improved, and the fuel efficiency can be greatly reduced.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. A heat recovery section M is mounted on a flue A of a boiler shown in FIG. 1, and the heat recovery section M is configured as follows. ing.

That is, the heat recovery section M includes a hot air passage a, a heating section b, a heat transfer section c, and a heat exchange channel d.

First, the hot air path a is formed of a gap formed between a cylindrical outer case 1 and a cylindrical inner case 2, and this gap communicates with a flue A. A baffle disposed above the road A and below the outer case 1.

Reference numeral 4 denotes a lower bottom plate of the inner case 2, and the lower bottom plate 4 extends to a gap between the outer case 1 and the inner case 2,
A large number of flow holes 5 are formed in the lower bottom plate 4 located between the cases.

Reference numeral 6 denotes a ceiling plate of the inner case 2,
Similarly, a communication hole 5 is provided between the inner and outer cases.

Next, the heating section b is formed by storing sand 7 in the inner bottom of the inner case 2.

That is, a sealed sand case is formed on the inner bottom portion of the inner case 2, and the case 7 is filled with sand 7.

Note that ceramic particles may be filled instead of the sand 7.

Next, the heat transfer section c is constituted by a heat pipe 8 erected in the inner case 2 by bringing the sand 7 into contact with the lower end.

The upper end of the heat pipe 8 is connected to the ceiling plate 6.

The heat pipe 8 is placed in a vacuum copper pipe,
A heat medium fluid 8-1 such as ethanol is sealed, and the pipe is heated from the lower end in contact with the sand 7 to evaporate the heat medium fluid in the pipe and to transfer heat to form a steam flow. The heat medium fluid that has flowed to the end is condensed, flows back to the lower end of the pipe by gravity, and is heated again. The heat from the heating part b is passed through the heat transfer part c through the heat exchange channel. d.

Next, the heat exchange passage d is formed so as to penetrate through the side surfaces of the outer case 1 and the inner case 2.
A hole is formed in the inner case 2 and the air inflow duct 9 and the hot air outflow duct 10 communicate with the hole.

As described above, since the ducts 9 and 10 are communicated with the space in the inner case 2, the heat transferred by the heat pipe 8 is exchanged in the inner case 2 and is exchanged with the outer case 1. Will be taken out.

Reference numeral 11 denotes an intake fan disposed in the flow path of the hot air outflow duct 10, and reference numeral 12 denotes an exhaust pipe. A shows a greenhouse using the exhaust heat recovery device of the present invention, B shows a boiler, C shows a hot air duct from boiler B, and D shows a hot air pipe connected to hot air outflow duct 10.

Since the present invention is constructed as described above, the hot air from the flue A of the boiler for heating a greenhouse or the like hits the baffle plate 3 from the lower end of the outer case 1 to the lateral side. Flows through the hot air passage a through the circulation hole 5 and heats the case filled with the sand 7, and the heated sand 7 heats the heat pipe 8 while exhibiting the far-infrared effect, and Heats the inner space of the inner case 2.

Since the heat exchange passage d is formed in the inner case 2, the heat from the heat pipe 8 is exchanged here to heat the air from the air inlet duct 9 and the hot air outlet duct 10. Take out hot air and use it again for heating greenhouses.

[0022]

According to the present invention, heat is effectively used because waste heat from the flue of the boiler is transferred through sand and a heat pipe, exchanges heat with the outside air, and uses the waste heat again. And
It has the effect of greatly reducing fuel consumption and greatly contributing to resource saving.

[Brief description of the drawings]

FIG. 1 is a cross-sectional side view of an exhaust heat recovery device of the present invention.

FIG. 2 is a cross-sectional view taken along line II of FIG.

FIG. 3 is a transverse sectional view taken along the line II-II of FIG. 1;

FIG. 4 is a transverse sectional view taken along the line III-III of FIG. 1;

FIG. 5 is an explanatory view of a state where the device of the present invention is used in a greenhouse.

[Explanation of symbols]

 A Flue M Heat recovery section a Hot air path b Heating section c Heat transfer section d Heat exchange flow path 1 Outer case 2 Inner case 3 Baffle plate 4 Lower bottom plate 5 Flow hole 6 Ceiling plate 7 Sand 8 Heat pipe 9 Air inflow duct 10 Hot air outlet duct

Claims (1)

[Claims] A heat recovery unit is mounted on a flue of a boiler, and the heat recovery unit is provided on a hot air path formed between a cylindrical outer case and a cylindrical inner case, and on an inner bottom of the inner case. A heating section formed by storing sand, ceramic particles, etc., a heat transfer section in which the lower part of the heat pipe is in contact with the heating section inside the inner case, and air taken into the heat transfer section from outside the outer case An exhaust heat recovery device comprising a heat exchange flow path for recovering heat by exchanging heat in the heat transfer section.