JPH08110179A - Heat recovery device using bubble - Google Patents

Abstract

PURPOSE: To provide a heat recovery device using bubbles capable of manufacturing the hot liquid or simultaneously manufacturing the hot liquid and cold liquid by efficiently recovering the excessive heat from a factory or a building, or the urban exhaust heat or the like which is wastefully disposed. CONSTITUTION: A heat recovery device using bubbles is provided with a high pressure blower 2 which sucks the exhaust gas 1 from a heat discharging source and compresses it in the condition of high temperature and high pressure, a high temperature heat recovery tank 4 to store the liquid 3 to collect the exhaust heat from the exhaust gas 1, and an exhaust gas header 7 which is provided to the lower part of the high temperature heat recovery tank 4, blows the exhaust gas 1 compressed in the condition of high temperature and high pressure by the high pressure blower 2 into the liquid 3 in the high temperature heat recovery tank 4, and brings the bubbles 6 into the direct contact with the liquid 3 to recover the heat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention efficiently recovers surplus heat generated from factories, buildings and the like, urban waste heat that is often wasted, and uses high-temperature liquid or high-temperature liquid and low-temperature liquid. The present invention relates to a bubble-using heat recovery device capable of simultaneously producing and.

[0002]

2. Description of the Related Art Surplus heat generated from factories, buildings, etc.
When recovering urban exhaust heat such as subway exhaust heat, generally, a heat exchanger is installed in the exhaust heat passage, the exhaust heat and the heat medium are indirectly exchanged with the heat exchanger, and the heat medium is passed through the heat medium. Heat recovery,
Further, in some cases, the recovered heat is further heated by a heat pump to be transported to a place where heat is insufficient and directly used as a heat source for heating, or used as a driving heat source for an absorption refrigerator or the like. Manufactures cold and hot water for use in cooling and heating.

[0003]

However, in the method of installing the heat exchanger as described above and indirectly exchanging heat between the exhaust gas and the heat medium by the heat exchanger to recover the heat, the heat exchange is performed. There is a problem in that sufficient heat recovery cannot be performed because the efficiency is limited. In particular, it has been difficult to effectively recover urban exhaust heat, which is not widely used at present, such as subway exhaust heat dispersed over a wide area. In addition, it is easy to directly produce high-temperature liquid such as hot water by recovering heat from waste heat, but there is no technology that can directly produce low-temperature liquid such as cold water. It is the current situation that indirectly manufactures low-temperature liquids.

[0004]

In order to solve the above problems, a bubble-using heat recovery apparatus according to the present invention comprises a high-pressure blower that sucks in exhaust gas from an exhaust heat source and compresses it into a high-temperature high-pressure state, and an exhaust gas from the exhaust gas. A high-temperature heat recovery tank that contains a liquid that recovers heat, and an exhaust gas that is provided below the high-temperature heat recovery tank and that is compressed to a high-temperature high-pressure state by the high-pressure blower are blown into the liquid inside the high-temperature heat recovery tank as bubbles. And an exhaust header for directly recovering heat by directly contacting the bubbles and the liquid.

Further, the bubble-using heat recovery apparatus according to the present invention includes a high-pressure blower that sucks the exhaust gas from the exhaust heat source and compresses it into a high-temperature high-pressure state, and a primary cooler that cools the exhaust gas compressed by the high-pressure blower. A secondary cooler that further cools the exhaust cooled by the same primary cooler, a low-temperature heat recovery tank that stores a liquid that recovers cold heat from the adiabatic expanded low-temperature low-pressure exhaust, and a lower part of the low-temperature heat recovery tank And an adiabatic expander for adiabatically expanding the exhaust gas from the secondary cooler to blow it into the liquid in the low temperature heat recovery tank as bubbles in a low temperature and low pressure state, and directly contacting the bubbles with the liquid to recover cold heat. , A low-temperature liquid in the low-temperature heat recovery tank is circulated to the secondary cooler to cool the exhaust gas and then sprayed from the header into the low-temperature heat recovery tank, and a high-temperature high-pressure exhaust from a high-pressure blower Turn exhaust heat from A heat medium for circulating the heat medium between the high temperature heat recovery tank containing the liquid to be stored, the heater provided in the high temperature heat recovery tank and the primary cooler, and recovering the exhaust heat from the exhaust gas in the high temperature and high pressure state. It is characterized by comprising a medium circulation system.

[0006]

Since the bubble-using heat recovery device according to the present invention is configured as described above, the exhaust gas compressed to a high temperature and high pressure state by the high pressure blower is recovered as high temperature heat from the exhaust header below the high temperature heat recovery tank as bubbles. Blows into the liquid in the tank and recovers heat from the exhaust by heat exchange between the gas and liquid by direct contact with the liquid while the bubbles rise in the liquid,
Thereby, the liquid can be heated to produce a high temperature liquid, which can be stored in the high temperature heat recovery tank.

Further, since the bubble-using heat recovery device according to the present invention is constructed as described above, the exhaust gas compressed to a high temperature and high pressure state by the high pressure blower is sequentially cooled by the primary cooler and the secondary cooler. In the low temperature heat recovery tank, the liquid in the low temperature heat recovery tank is cooled by performing adiabatic expansion with an adiabatic expander to cool the liquid in the low temperature heat recovery tank, and the exhaust gas that has been in the low temperature low pressure state due to adiabatic expansion is used as bubbles. To be stored in the low temperature heat recovery tank by cooling the liquid by heat exchange between the gas and the liquid by direct contact with the liquid while the bubbles are rising in the liquid and then producing the low temperature liquid. You can On the other hand, heat is exchanged with the exhaust gas in a high temperature and high pressure state in the primary cooler, and the heat medium heated by cooling this is circulated to the heater provided in the high temperature heat recovery tank through the heat medium circulation system, A high temperature liquid is produced by heating the liquid by exchanging heat with the liquid in the high temperature heat recovery tank,
It can be stored in the high temperature heat recovery tank. Therefore, a low temperature liquid and a high temperature liquid can be manufactured simultaneously.

[0008]

Embodiments of the present invention will be described below with reference to FIGS. 1 is a configuration diagram of a bubble-using heat recovery device according to a first embodiment of the present invention, and FIG. 2 is a configuration diagram of a bubble-using heat recovery device according to a second embodiment of the present invention. The first embodiment shows an example in which a high temperature liquid is produced by recovering heat from waste heat, and waste heat such as heat from the outside air, surplus heat from factories, buildings, etc., or waste heat from the subway is wasted. High-pressure blower 2 that collects and sucks in exhausted exhaust gas 1 such as urban exhaust heat, compresses it into a high-temperature high-pressure state, high-temperature heat recovery tank 4 that stores liquid 3 such as water, and high-temperature heat recovery tank 4 And an exhaust header 7 which blows exhaust gas in a high temperature and high pressure state sent from the high pressure blower 2 through the pipe 5 into the liquid 3 in the high temperature heat recovery tank 4 as bubbles 6 provided at the bottom of the.

On the liquid surface of the liquid 3 in the high temperature heat recovery tank 4, an evaporation preventive material 8 made of expanded polystyrene balls or plates is arranged to prevent heat loss due to evaporation from the liquid surface. I try to prevent it. Further, an exhaust fan 9 is installed on the upper part of the high temperature heat recovery tank 4, and a heat extraction heat exchanger 10 for extracting the heat of the high temperature liquid stored in the liquid 3 and supplying it as a heat source for heating, for example. Is provided.

However, according to the above embodiment, the exhaust gas 1 from the exhaust heat source is sucked into the high pressure blower 2 and compressed into a high temperature and high pressure state, and the exhaust gas provided at the bottom of the high temperature heat recovery tank 4 through the pipe 5. It is sent to the header 7 and is blown into the liquid 3 in the high temperature heat recovery tank 4 as fine bubbles 6 from there. The smaller the radius of the bubbles 6, the larger the surface area per volume, and the larger the contact area with the liquid 3 to increase the amount of heat exchange, so that the exhaust gas is discharged from the liquid 3 in the high temperature heat recovery tank 4. It is desirable that the exhaust header 7 blown into the inside as bubbles 6 is configured so that the bubbles 6 as fine as possible can be produced. The bubbles 6 blown into the liquid 3 come into direct contact with the liquid 3 while rising in the liquid 3 and heat the liquid 3 by heat exchange between gas and liquid, and then are discharged to the outside by an exhaust fan 9. On the other hand, the liquid 3 heated by direct contact with the bubbles 6 becomes a high temperature liquid, is stored in the high temperature heat recovery tank 4, and is taken out through the heat take-out heat exchanger 10 when necessary, and is used as a heating heat source or the like. Used as.

The exhaust gas 1 thus compressed to a high temperature and high pressure state by the high pressure blower 2 is blown into the liquid 3 in the high temperature heat recovery tank 4 as bubbles 6, and heat is generated by heat exchange by direct contact between the bubbles 6 and the liquid 3. Since the heat is recovered, the heat exchange efficiency can be improved and sufficient heat recovery can be achieved as compared with the case where the heat is indirectly exchanged using the heat exchanger. Further, since the evaporation preventive material 8 is disposed on the liquid surface of the liquid 3 in the high temperature heat recovery tank 4 to prevent heat loss due to evaporation from the liquid surface, the heat loss during heat storage is minimized. be able to. It should be noted that the high-pressure blower 2 is driven by using inexpensive late-night power, and the apparatus is operated at night to produce a high-temperature liquid to store heat in the high-temperature heat recovery tank 4, which is taken out and used during the daytime. By doing so, the running cost can be reduced.

Next, a second embodiment capable of simultaneously producing a high temperature liquid and a low temperature liquid by recovering heat from exhaust heat will be described with reference to FIG. The bubble-based heat recovery apparatus according to the second embodiment collects the exhaust 11 from the exhaust heat source, sucks it in, and compresses it into a high-temperature high-pressure state, and a low-temperature heat recovery containing a liquid 13 such as water. Tank 14 and low temperature heat recovery tank 1
Exhaust gas, which is provided at the lower part of 4 and is in a low temperature and high pressure state, is adiabatically expanded to be in a low temperature and low pressure state and blown into the liquid 13 in the low temperature heat recovery tank 14 as bubbles 15.
Adiabatic expander 16 for recovering cold heat by directly contacting with 3
A pipe 17 for sending the exhaust gas from the high-pressure blower 12 to the adiabatic expander 16, a primary cooler 18 provided in the middle of the pipe 17 for exchanging heat with the high-temperature high-pressure exhaust gas to cool the exhaust gas, and a primary cooler 18 A secondary cooler 19 which is provided on the downstream side of the pipe 17 and exchanges heat with exhaust gas of medium temperature and high pressure to cool the exhaust gas.
And a low-temperature liquid circulation system 22 that circulates the low-temperature liquid 13 in the low-temperature heat recovery tank 14 to the secondary cooler 19 via the pump 20, cools the exhaust gas, and then sprays it from the header 21 in the low-temperature heat recovery tank 14. A forced exhaust fan 23 provided above the low temperature heat recovery tank 14, a user side pipe 24 for circulating the low temperature liquid 13 in the low temperature heat recovery tank 14 to and from the user side, and a liquid 25 such as water High temperature heat recovery tank 26, a heater 27 provided in the high temperature heat recovery tank 26, and a primary cooler 18
A heat medium circulating system 29 that circulates a heat medium between the heating device 27 and the heater 27 via a pump 28 to recover exhaust heat from exhaust gas in a high temperature and high pressure state, and a switching valve 30 and a bypass in the middle of the heat medium circulating system 29. A cooling tower 32 connected via a circuit 31,
The heat pump 34 includes a heat exchanger 33 provided in the high-temperature heat recovery tank 26, and a usage-side pipe 35 that circulates the heat medium heated by the heat pump 34 to the usage side.

Exhaust gas 11 exhausted from the exhaust heat source
Is sucked into the high-pressure blower 12, compressed into a high-temperature and high-pressure state, and sent to the adiabatic expander 16 provided at the bottom of the low-temperature heat recovery tank 14 through the pipe 17. The exhaust 11 is sequentially cooled by the primary cooler 18 and the secondary cooler 19 in the middle of this, and becomes exhaust in a low temperature and high pressure state. The exhaust gas in the low-temperature and high-pressure state is rapidly adiabatically expanded by the adiabatic expander 16, becomes a low-temperature and low-pressure state, and is blown from the adiabatic expander 16 into the liquid 13 in the low-temperature heat recovery tank 14 as fine bubbles 15 as much as possible. Due to this adiabatic expansion, the liquid 1 in the low temperature heat recovery tank 14
3 is cooled, and the liquid 13 is further cooled by heat exchange due to direct contact between the bubbles 15 and the liquid 13 while the fine bubbles 15 rise in the liquid 13. This is based on the so-called air cycle refrigeration principle, and does not use CFC gas or carbon dioxide gas, so that it has no influence on environmental problems.

The bubbles 15 rise in the liquid 13 and are released on the liquid surface. By forcibly exhausting the bubbles 15 by the forced exhaust fan 23, the evaporation phenomenon on the liquid surface is promoted and the evaporation latent heat further evaporates the liquid. 13 can be cooled.
In addition, during this time, a part of the liquid 13 in the low temperature heat recovery tank 14 is
After being circulated to the secondary cooler 19 via the low temperature liquid circulation system 22 having the pump 20, and exchanging heat with the exhaust gas in the pipe 17 to cool the exhaust gas, the low temperature heat recovery tank 14 from the header 21 is cooled.
Although it is dispersed inside, liquid 1 is also generated by the latent heat of vaporization at this time.
3 can be cooled. The low-temperature liquid 13 produced by the cold heat recovery from the exhaust gas as described above is stored in the low-temperature heat recovery tank 14 and is taken out from the utilization side pipe 24 when necessary and used as a heat source for cooling or the like.

On the other hand, the heat recovered by the heat medium in the heat medium circulation system 29 by cooling the exhaust gas in the high temperature and high pressure state by the primary cooler 18 is pumped by the high temperature heat recovery tank 26.
It is circulated to a heater 27 provided inside, and exchanges heat with the liquid 25 in the high temperature heat recovery tank 26 by the heater 27 to heat the liquid 25 to produce the high temperature liquid 25. The high-temperature liquid 25 is stored in the high-temperature heat recovery tank 26 and is directly circulated to the user side to be used as a heat source for heating or the like, or the heat pump 34.
Is used as a heat source of the above, and hot water of higher temperature is manufactured and supplied to the use side pipe 35, and is used in various ways. The temperature of the high temperature liquid 25 in the high temperature heat recovery tank 26 is detected so that the temperature does not become too high, and when the temperature reaches the set temperature, the switching medium 30 bypasses the heat medium to the cooling tower 32.
By radiating the recovered heat to the atmosphere, the temperature of the high temperature liquid 25 can be adjusted.

As described above, according to the second embodiment, the high temperature liquid can be produced simultaneously with the production of the low temperature liquid by recovering the heat from the exhaust gas, and the principle of the air cycle refrigeration is utilized. It is safe without any environmental problems, and each device can use general commercial products and can be configured by combining them, so the initial cost can be kept low and maintenance is easy. You can

[0017]

As described above, according to the bubble-using heat recovery device of the present invention, the heat is recovered by the heat exchange due to the direct contact between the exhaust gas and the liquid. Since the heat exchange efficiency can be improved and sufficient heat recovery can be performed as compared with the case of indirectly recovering heat by using, the high temperature liquid can be efficiently produced. Further, by incorporating the principle of air cycle refrigeration, it is possible to produce a low temperature liquid at the same time as producing a high temperature liquid by recovering high temperature heat. Moreover, since high-temperature liquids, or high-temperature liquids and low-temperature liquids can be manufactured at the same time only by recovering heat from exhaust gas, they are safe without environmental problems, and do not require special equipment. Since it can be configured by a combination of the above, the manufacturing cost is low, and maintenance and management are easy.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a bubble-using heat recovery device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a bubble-using heat recovery device according to a second embodiment of the present invention.

[Explanation of symbols]

 1, 11 Exhaust 2, 12 High pressure blower 3, 13, 25 Liquid 4, 26 High temperature heat recovery tank 6, 15 Bubble 7 Exhaust header 8 Evaporation prevention material 14 Low temperature heat recovery tank 16 Adiabatic expander 18 Primary cooler 19 Secondary cooling Device 21 Header 22 Low temperature liquid circulation system 23 Forced exhaust fan 27 Heater 29 Heat medium circulation system 30 Switching valve 31 Bypass circuit 32 Cooling tower

Claims (6)

[Claims] 1. A high-pressure blower that sucks exhaust gas from an exhaust heat source and compresses it into a high-temperature high-pressure state, a high-temperature heat recovery tank that stores a liquid that recovers exhaust heat from the exhaust gas, and a lower part of the high-temperature heat recovery tank. And an exhaust header that blows exhaust gas compressed into a high-temperature high-pressure state by the high-pressure blower into the liquid in the high-temperature heat recovery tank as bubbles, and directly recovers heat by directly contacting the bubbles with the liquid. A heat recovery device using bubbles. 2. The bubble-using heat recovery device according to claim 1, wherein an evaporation prevention material for preventing heat loss due to evaporation is provided on the liquid surface in the high temperature heat recovery tank. 3. The bubble-using heat recovery device according to claim 2, wherein the evaporation preventing material is constituted by a ball or plate made of expanded polystyrene. 4. A high-pressure blower that sucks the exhaust gas from the exhaust heat source and compresses it into a high-temperature high-pressure state, a primary cooler that cools the exhaust gas compressed by the high-pressure blower, and an exhaust gas that is cooled by the same primary cooler. A secondary cooler for cooling, a low-temperature heat recovery tank for storing liquid that recovers cold heat from the low-temperature low-pressure exhaust gas that has been adiabatically expanded, and an exhaust gas from the secondary cooler that is provided below the low-temperature heat recovery tank. Is adiabatically expanded into a low-temperature low-pressure state to blow into the liquid in the low-temperature heat recovery tank as bubbles, and the adiabatic expander for directly contacting the bubbles with the liquid to recover cold heat, and the low-temperature liquid in the low-temperature heat recovery tank A low-temperature liquid circulation system that circulates to the secondary cooler and cools the exhaust gas and then sprays it from the header into the low-temperature heat recovery tank, and a high-temperature liquid that collects exhaust heat from the high-temperature and high-pressure exhaust gas from the high-pressure blower. Same as the heat recovery tank A heat medium circulating system that circulates a heat medium between a heater provided in the heat recovery tank and the primary cooler, and recovers exhaust heat from exhaust gas in a high temperature and high pressure state. Bubble heat recovery device. 5. The bubble-based heat recovery apparatus according to claim 4, wherein a forced exhaust fan is provided above the low temperature heat recovery tank. 6. The heat recovery device using air bubbles according to claim 4, wherein a cooling tower is connected in the middle of the heat medium circulation system via a switching valve and a bypass circuit.