JP2565997B2 - Waste heat recovery type gas fired humidifier - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste heat recovery type gas heating / humidifying device, and more particularly to a waste heat recovery type gas heating / humidifying device of a system in which exhaust heat of a gas burner is given to the outside air taken in outdoors in winter. Regarding

2. Description of the Related Art Conventional humidification is performed by spraying or evaporating tap water, hot water, or steam into the air. As the method, a water spray method of applying pressure to water to spray it from a nozzle, an ultrasonic humidification method of spraying water by applying ultrasonic vibration, a vaporization method in which water is impregnated into a non-woven fabric, and a centrifugal force are used. There are a centrifugal type in which water is finely crushed and sprayed, and a steam type in which water is heated and sprayed in the state of steam. In terms of scale, there are a central method that distributes air humidified in the center to each room and a dispersion method that humidifies each room.

In the case of central system steam humidification, steam is produced by a gas-fired or petroleum-fired steam boiler and supplied to an air conditioner or the like. But,
To use a steam boiler, a boiler handling qualification is required, and the central system has a problem of high running cost.

In the case of the dispersion method, a resistance wire heater is used with electricity as a heat source, or a heating method in which an electric current is caused to flow in water with electrodes. However, the method of using electricity as a heat source not only causes an increase in the electric power load of the building and causes the upgrade of the transformer capacity, but also has a drawback that the rise of steam generation is delayed due to the heat capacity of the electric heater itself. In addition, since electric power is used as heat, the efficiency is low and it is not always desirable from the viewpoint of resource saving.

In order to solve these problems, the present inventors disclosed a gas-fired humidifier in Japanese Patent Laid-Open No. 2-150638. The gist of the gas-fired humidifier 10 shown in FIGS. 2 and 3 is a hollow cylindrical pot 1 having a steam pipe 5 in the upper portion, and the lower end communicates with the lower portion of the pot 1 and the upper end. And a gas burner 3 provided below the kettle 1 and the heat exchange coil 2, and a gas burner 3 provided below the kettle 1 and the heat exchange coil 2. It is a system humidifier. Water poured from the water supply pipe 4 into the kettle 1 is the gas burner 3
Is heated to become steam, and the steam is sent from the steam pipe 5 to the room to humidify the room air. Excess water in the kettle 1 is discharged from the overflow pipe 6, and the water in the kettle 1 is replaced by a drain pipe 7 for preventing scale accumulation.

Since this gas-fired humidifier is a dispersion type and does not generate high-pressure steam, the internal pressure of the kettle 1 is substantially the same as the atmospheric pressure, and the structure is relatively simple and can be managed by a boiler handling qualified person. It is unnecessary and has an advantage that the rise of steam generation is faster than the conventional electric heating type due to the heat exchange coil 2.

However, in the gas-fired humidifier 10 of FIGS. 2 and 3, the combustion waste heat of the gas burner 3 is released to the air around the kettle 1 and is not effectively utilized. By recovering the combustion waste heat of the gas burner 3 by preheating the outside air taken in from the outdoors during winter heating, the sensible heat and latent heat load in the air conditioner that heats and humidifies the outside air is reduced, that is, humidification. It is expected that the thermal efficiency of the entire air conditioning system including the air conditioner and air conditioner will be improved.

Therefore, an object of the present invention is to provide a gas-fired humidifying device which is a dispersion type and has a rapid rise in steam generation and which is capable of recovering waste heat.

Means for Solving the Problems Referring to the embodiments shown in FIGS. 1, 2, and 3, a waste heat recovery type gas-fired humidifying device of the present invention has a hollow cylindrical shape having a steam pipe 5 at an upper portion thereof. Of the kettle 1, the lower end of which is communicated with the lower portion of the kettle 1 and the upper end of which is communicated with the steam pipe 5, and the entire surface of which is continuously exposed in the hollow portion 1a of the kettle 1, the heat exchange coil 2, the kettle 1 and the heat exchange It has a gas burner 3 provided below the coil 2, an exhaust passage 36 communicating with the combustion exhaust duct 11 of the gas burner 3, and an air supply passage 37 communicating with the outside air. A total heat exchanger 30 for performing total heat exchange between them, and an air supply duct communicating with the outlet of the air supply passage 37 of the total heat exchanger 30.
22 is used.

Action In FIG. 1, the water in the hollow cylindrical kettle 1 is heated by the gas burner 3 to generate water vapor. The generated water vapor is discharged directly or preferably via the steam pipe 5 into the air in the room, and the function of the dispersion type humidifier is fulfilled. Further, the internal pressure of the kettle 1 is about the same as the atmospheric pressure, and it is not necessary to use a high-pressure container, and of course, there is no need for a boiler handling qualified person. That is, it is sufficient to construct the pot 1 as a structure having the same strength as that of a domestic gas water heater, so that it can be manufactured at low cost. Moreover, since it is used at the same pressure as the atmospheric pressure, there is no requirement of a specially qualified administrator because of the regulations, so the operating cost can be kept low. Hollow part 1a of the hollow cylindrical pot 1
Further, a heat exchange coil 2 whose lower end communicates with the lower portion of the kettle 1 and upper end communicates with the steam pipe 5 and whose entire surface is continuously exposed in the hollow portion 1a is attached, so that the wide surface of the coil 2 is a gas burner. When exposed to the combustion heat of the gas burner 3, the water in the coil 2 can be evaporated in a short time immediately after the ignition of the gas burner 3, and a quick rise of steam generation can be secured.

The combustion exhaust duct 11 of the gas burner 3 is communicated with the exhaust passage 36 of the total heat exchanger 30, and the outside air is an air supply passage 37 of the total heat exchanger 30.
When the outside air is low temperature dry air in winter, the sensible heat and latent heat of the exhaust gas of the gas burner 3 are given to the supply air in the total heat exchanger 30 to recover the waste heat of the gas burner 3. be able to. Therefore, if the air from the outlet 34 of the air supply passage 37 of the total heat exchanger 30 is sent to an air conditioner (not shown) or the like, the air conditioning energy can be saved as compared with the case where the total heat exchanger 30 is not used. You can

Thus, the object of the present invention is to provide a "gas-fired humidifying device which is a dispersion system and has a rapid rise in steam generation and waste heat recovery".

Embodiment FIG. 1 is a schematic diagram showing the construction of an embodiment of the present invention, and FIG. 2 is a perspective view of the essential parts of an example of a total heat exchanger. The air taken in at the outside air intake 40 passes through the air duct 41 and the gas-fired humidifier.
Guided to Case 9 of 10. The case 9 is made of an iron plate lined with a heat insulating material such as glass wool, and covers the entire gas-fired humidifier 10.

The air guided to the case 9 is used for gas combustion in the gas burner 3. The gas burner 3 is connected from the water supply pipe 4 to the kettle 1
The water supplied to is heated to generate steam from the upper part of the kettle 1, and the steam is supplied to a target site such as an air conditioner, a duct, or a room through the steam pipe 5.

In order to prevent the water level in the kettle 1 from becoming higher than a predetermined level, an overflow pipe 6 is attached to the kettle 1 at an appropriate height. Further, a drain pipe 7 is provided at the bottom of the kettle 1 in order to prevent the scale or the like deposited from water from adhering to the inner wall surface or the bottom surface of the kettle 1 and hindering heat conduction.

The kettle 1 is provided with a communication pipe (not shown) for detecting the water level, etc. to monitor the water level in the kettle 1 and the water supply pipe 4
From top to bottom.

The high temperature combustion exhaust gas in the case 9 rises due to the temperature difference and advances to the combustion exhaust duct 11. The other end of the combustion exhaust duct 11 is connected to an exhaust inlet 31 of a total heat exchanger 30 via an exhaust damper 26. The total heat exchanger 30 includes an exhaust inlet 31 to an exhaust outlet 32.
It has an exhaust flow path 36 leading to. The exhaust flow path 36 is in contact with the air supply flow path 37 via the partition plate 35, and the partition plate 35 is made of, for example, special processed paper, and sensible heat is generated between the gas in the air supply flow path 37 and the gas in the exhaust flow path 36. Exchange latent heat. The latent heat in this case also includes water generated during gas combustion in the gas burner 3. A space plate 38 for adjusting the flow of gas is provided in the air supply flow path 37 and the exhaust flow path 36, and the space plate 38 can also be made of specially processed paper.

The exhaust outlet 32 is connected to the exhaust gallery 16 via the connecting duct 13, the exhaust fan 14, and the exhaust duct 15, and the total heat exchanger 30
The combustion exhaust gas that has undergone heat exchange with is discharged outdoors.

The outside air for air conditioning is the intake louver 17 and the intake duct 18
The air is sucked in by the blower 19 via the air blower, and is guided to the air supply inlet 33 of the total heat exchanger 30 via the connection duct 20 and the air supply damper 27. The air supply inlet 33 is an inlet of the air supply passage 37 of the total heat exchanger 30, and the air supply warmed by heat exchange from the combustion exhaust gas in the passage 37 is connected to the air supply outlet 34 connecting duct 21 and It is sent to an air conditioner (not shown) or the like via the air supply duct 22.

With the above configuration, the waste heat of the combustion exhaust gas of the gas-fired humidifier 10 is recovered in the total heat exchanger 30 and given to the air supply, reducing the heat load of the air conditioner and improving the thermal efficiency of the heating system.

An exhaust bypass duct 23 that connects the combustion exhaust duct 11 and the connection duct 13 via an exhaust bypass damper 25, and an air supply duct 22 and a connection duct via an air supply bypass duct 28.
The air supply bypass duct 24 communicating with 20 is connected to the total heat exchanger 30.
It is for adjusting the amount of heat exchanged in. For example, when the temperature of the supply air rises more than necessary due to heat exchange in the total heat exchanger 30, the supply air damper 27 is throttled to reduce the total heat exchanger.
Reduce the air flow to 30 and increase the opening of the air supply bypass damper 28. At the same time, the exhaust damper 26 is throttled to reduce the exhaust air volume to the total heat exchanger 30 and increase the opening degree of the exhaust bypass damper 25. In this case, the opening degree of the exhaust bypass damper 25 and the opening degree of the supply air damper 27 may be equalized, and the opening degree of the supply air bypass damper 28 may be adjusted to be equal to the opening degree of the exhaust damper 26.

Effects of the Invention As described in detail above, the waste heat recovery type gas-fired humidifying apparatus according to the present invention is a hollow cylindrical kettle having an upper steam pipe, a lower end communicating with a lower part of the kettle and an upper end of the steam pipe. A heat exchange coil that is connected to the hollow part of the kettle with its entire surface exposed continuously, a gas burner provided below the kettle and the heat exchange coil, an exhaust flow path that communicates with the combustion exhaust duct of the gas burner, and the outside air. A total heat exchanger having a supply air flow path communicated with each other and performing total heat exchange between an exhaust gas and a supply air gas, and an air supply duct communicating with an outlet of the air supply flow path of the total heat exchanger. Since the configuration including the above is used, a remarkable effect is obtained that the rise of steam generation in the gas humidification device for distributed humidification is fast and the heat of combustion exhaust is recovered to reduce the heat load of the air conditioner.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of the present invention, FIGS. 2 and 3 are schematic sectional views and perspective views of an example of a gas-fired humidifier, and FIG.
The figure is an explanatory view of main parts of the total heat exchanger. 1 ... pot, 1a ... hollow part, 2 ... heat exchange coil, 3 ...
Gas burner, 4 ... Water supply pipe, 5 ... Steam pipe, 6 ... Overflow pipe, 7 ... Drain pipe, 8 ... Water level detector, 9 ... Case, 10 ... Gas-fired humidifier, 11 ... Combustion exhaust duct, 13,
20, 21 ...... Connection duct, 14 ...... Exhaust fan, 15 …… Exhaust duct, 16 …… Exhaust gallery, 17 …… Intake gallery, 18 …… Intake duct, 19 …… Blower, 22 …… Air supply Duct, 23 ... Exhaust bypass duct, 24 ... Air supply bypass duct, 25 ... Exhaust bypass damper, 26 ... Exhaust damper, 27 ... Air supply damper, 28 ... Air supply bypass damper, 30 ... Total heat Exchanger, 31
…… Exhaust inlet, 32 …… Exhaust outlet, 33 …… Supply inlet, 34…
… Air supply outlet, 35 …… partition plate, 36 …… exhaust flow passage, 37 …… air supply passage, 38 …… spacing plate, 40 …… air intake, 41 …… air duct.

Claims (1)

(57) [Claims] 1. A hollow cylindrical kettle having a steam pipe in an upper portion, a lower end of which is communicated with a lower portion of the kettle and an upper end of which is communicated with the steam pipe so that the entire surface is continuously exposed in the hollow portion of the kettle. A heat exchange coil attached, a gas burner provided below the pot and the heat exchange coil, an exhaust flow passage communicating with the combustion exhaust duct of the gas burner, and an air supply flow passage communicating with the outside air, and an exhaust gas A waste heat recovery type gas-fired humidifying device comprising a total heat exchanger for exchanging total heat with a supply air gas, and an air supply duct communicating with an outlet of an air supply passage of the total heat exchanger.