JPH0548062Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a wood drying device, and in particular, the heat generated by the engine generator for cogeneration is recovered and supplied to the wood drying device, thereby saving energy and reducing pollution. The present invention relates to a highly practical wood drying device that is useful for preventing such problems and also enables the electric power consumed by the wood drying device to be covered by the private power generation of the engine generator.

(Prior art) In conventional wood drying equipment, air is supplied by a blower to the heating section of an electric heater, and warm air heated to an appropriate temperature is circulated within the drying chamber.
The wood is dried.

In this case, to adjust the temperature inside the drying room,
Heat pump dehumidifiers and humidifiers that evaporate water using electric heaters are also used.

(Problem that the invention aims to solve) In timber production, it is sometimes more advantageous to transport lumber and dried wood products from the logging site to the demand area, and logging sites are generally located in sheltered areas such as mountains. Usually, there is no commercial power supply, and the above-mentioned conventional devices that use commercial power supply have problems.

Therefore, as a way to solve the above power supply problem, it is possible to bring an engine generator to the logging site, but since energy saving measures such as exhaust heat recovery from the generator are not taken, the power generation cost is high and it is not profitable from an economic standpoint. The current situation is that it cannot be obtained.

Also, Utility Application No. 59-29110 (Utility Application No. 60-140898)
As shown in the microfilm, a drying device is also known that uses an engine generator, a burner, and the combustion heat from the burner as a heat source for drying hot air. Because the burner is located downwind and the burner is not located to open to the engine exhaust gas outlet,
It is difficult to completely burn the exhaust gas, and since the engine exhaust gas is led directly into the drying oven, it is undeniable that it may have a negative effect on the products inside the drying oven, and it is not possible to precisely control the temperature. It has the following problems.

Furthermore, Utility Application No. 57-199693 (Utility Application No. 59-103194)
There is also a known drying device that uses hot air supply means that utilizes heat from the exhaust gas from an internal combustion engine that drives a generator, as shown in the microfilm of No. Since the exhaust gas heat exchanger of a diesel engine is clogged by the soot content in the exhaust gas and requires frequent cleaning, the exhaust gas of the diesel engine is Since it contains a high concentration of Nox, it is not desirable to discharge it as is from the viewpoint of pollution prevention.

The object of this invention is to provide a wood drying device that solves the above problems.

(Means and effects for solving the problem) This invention was created in view of the above points, and consists of an engine generator, a burner, and combustion heat from the burner as a heat source for drying hot air for wood. In the wood drying device, the wood drying unit is arranged on the downwind air path side of the heat radiation exchange part that cools the engine power distribution device, and the burner is installed in the middle of the air path connecting the heat radiation exchange part and the wood drying unit. The burner is configured to open at the engine exhaust gas outlet so that the engine exhaust gas enters the combustion section downstream of the burner opening, and the combustion section is connected to a heat exchange type heater, and the combustion section and the heater are connected to each other. An exhaust pipe with a damper is installed between the two, and the wood drying unit has a blower, a heat exchange type heater, a drying chamber equipped with an intake and exhaust pipe, a dehumidifier, and a humidifier. It has a heater and is connected to the cooling water channel of the radiator of the heat radiation exchange part that cools the engine generator, and supplies clean air heated in the heat radiation exchange part to the wood drying unit as wood drying air. At the same time, the exhaust gas from the engine of the engine generator is guided to the combustion section of the burner to be sufficiently re-burned and exhaust heat can be recovered, and the electric power consumed by the burner and wood drying unit can be replaced by the in-house power generation of the engine generator. This makes it possible to save energy, save energy, and help prevent pollution.

In addition, by combining the combustor and exhaust heat damper installed in the air passage, it is now possible to perform fine temperature control. This reduces the possibility of blockages and is extremely practical.

(Example) An example of this invention will be described below based on the drawings. The figure shows a wood drying device that utilizes engine power generation exhaust heat using a water-cooled diesel engine generator.

In the figure, the engine generator 4 consists of a generator 1, an engine 2, and a radiator 3. A small amount of air necessary for combustion of fuel enters the combustion section through a burner 8, and exhaust gas from the engine 2 passes through an exhaust pipe 9. It is guided to the combustion section downstream of the opening of the burner 8 and is re-burned there.

The engine room 23 is filled with low-temperature air that has been heated by radiation from the engine generator 4 and heat radiation from the radiator 3. The burner 8 is composed of a blower 5, a burner motor 6, and a nozzle 7. Part of the low-temperature air in the engine room 23 is supplied to the combustion section via the blower 5, and mixed with fuel injected from the nozzle 7. Then, combustion takes place in the combustion section.

At this time, the engine exhaust gas introduced into the combustion section through the exhaust pipe 9 not only uses residual oxygen at an appropriate temperature contained therein to help burn the fuel, but also uses the high-temperature thermal energy of the exhaust gas as the thermal energy of the combustion gas. It also helps increase

The hot combustion gases thus produced in the combustion section are sent to a heat exchange heater 18, which is part of the wood drying unit 24.

The main components of the wood drying unit 24 are a blower 17, a heat exchange heater 18, and a drying chamber 1.
9, a dehumidifier 22, a humidifier 11, etc.

A blower 17 consisting of a fan 15 and a fan motor 16 sucks in most of the low-temperature air in the engine room 23 and sends it to the heat exchange type heater 18, where the high temperature air produced in the combustion section is transferred through heat exchange. The combustion gas gives its thermal energy to the low-temperature air from the blower 17 and becomes low-temperature exhaust gas,
It dissipates into the atmosphere through the chimney 13.

On the other hand, the lukewarm air sent from the blower 17 to the heat exchange type heater 18 is converted into warm air at an appropriate temperature by heat exchange, and is sent into the drying chamber and circulated in the drying chamber 19 to dry the wood.

In order to adjust the temperature inside the drying chamber 19, a humidifier 12 and a dehumidifier 22 are provided. and humidifier 1
2 is replenished with water, and this supplementary water is designed to recover exhaust heat from the engine cooling water in the heat exchanger 10, thereby further contributing to energy saving.

The humidifier 12 is equipped with a humidifier electric heater 11 as a heat source for generating heat. ,
The power required for the burner motor 6 for the burner 8 can be covered by the in-house generated power from the engine generator 4. In other words, the power required for all the power consuming equipment installed in the wood drying unit can be covered by the engine generator 4. The energy saving effect is remarkable as it can be covered by the electricity generated by the in-house generator.

Further, in the embodiment of this invention, an exhaust pipe 20 with a damper is provided in the circuit connecting the burner 8 and the heat exchange type heater 18 in order to adjust the air volume of high temperature combustion gas sent from the burner 8 to the heat exchange type heater 18. By combining a combustor and an exhaust heat damper in the air path in this way, the combustor can perform proportionally controlled combustion, especially during humidification in a complex humidification process, allowing the temperature to rise quickly. This allows fine temperature control.

Further, by providing an intake and exhaust pipe 14 in the drying chamber 19, the air inside the drying chamber 19 can be adjusted.

(Effect of the invention) This invention is constructed as detailed above, so
In other words, instead of using an electric heater that consumes a large amount of electricity, we use a fuel-burning burner, and all the electricity consumed by the burner and wood drying unit is used.
Significant energy savings can be achieved by generating electricity from the engine generator in-house and at the same time introducing exhaust gas from the engine generator into the combustion section of the burner to recover waste heat.

In this design, the burner is placed in the air passage so that it opens at the exhaust gas outlet of the engine, so a small amount of air necessary for fuel combustion enters the combustion section through the burner, and the engine exhaust gas is Since it enters the combustion section downstream of the burner opening, the safety of the flame is increased and secondary combustion of the exhaust gas is facilitated.

Therefore, the engine exhaust gas can be sufficiently re-burned to make the high-temperature heat engine of the exhaust gas effectively contribute to increasing the thermal energy of the combustion gas, and this high-temperature exhaust gas can be re-burned through the heat exchange heater. Since it is sent into the furnace as clean high-temperature air, it does not have any negative effect on the quality of the wood inside the drying furnace.

Therefore, this invention makes it possible to dry wood at logging sites in sheltered areas where commercial electricity cannot be supplied, and also enables low-cost self-generated electricity by saving energy by starting heat generation from the engine generator. It is possible to dry wood economically.

Furthermore, this invention eliminates the need for frequent cleaning because the exhaust gas heat exchanger is clogged with soot as in the past, making it extremely practical and useful for preventing pollution. Combustion (reheating) that matches the amount of gas becomes possible.

[Brief explanation of the drawing]

The figure diagrammatically shows an embodiment of this invention. 1... Generator, 2... Engine, 3... Radiator, 4... Engine generator, 5... Blower, 6
... Burner motor, 7 ... Nozzle, 8 ... Burner, 9 ... Exhaust pipe, 10 ... Heat exchanger, 15 ...
Fan, 16...Fan motor, 17...Blower, 18...Heat exchange type heater, 19...Drying room, 20...Exhaust stack, 21...Dehumidifying motor, 22
...Dehumidifier, 23...Engine room, 24...
Wood drying unit.

Claims (1)

[Scope of utility model registration request] The wood drying unit consists of an engine generator, a burner, and a wood drying unit that uses the combustion heat from the burner as a heat source for drying hot air for the wood. In the drying device, the burner is provided in the middle of the air path connecting the heat radiation exchange part and the wood drying unit, and the side burner is arranged so as to open at the engine exhaust gas outlet, so that the engine exhaust gas flows into the combustion section downstream of the burner opening. The combustion section is connected to a heat exchange heater, an exhaust pipe with a damper is provided between the combustion section and the heater, and the wood drying unit is connected to a blower, a heat exchange heater, and an intake and exhaust pipe. It has a drying room equipped with a dehumidifier, a dehumidifier, and a humidifier, and the humidifier has an electric heater for humidification, and is connected to the cooling water channel of the radiator of the heat radiation exchange part that cools the engine generator. Characteristic wood drying equipment.