JPH02269205A - Unsprinkled snow melting method by boiler heating - Google Patents

Abstract

PURPOSE:To quickly melt snow by mixing a nonfreezing solution in a tank warmed by a boiler on the ground and a cooled nonfreezing solution in a heat radiating pipe buried in the road surface with a mixing three-way valve, and feeding the mixture to the heat radiating pipe when snow falls. CONSTITUTION:Operations and stops of a boiler 2 and a circulating pump 4 are repeated by the signal issued by a temperature detecting device 15 in a tank 3, and a nonfreezing solution in the tank 3 is maintained at 60 deg.C or below. when snow falls or the road surface may be probably frozen, the operation of a circulating pump 5 is started by the signal issued by a snowfall detector 12, and the nonfreezing solution in the tank 3 is fed to a heat radiating pipe 7 buried in the road surface 14. The nonfreezing solution at 15-20 deg.C is obtained by a short circuit pipe 10, a mixing three-way valve 11 and a temperature detecting device 9 provided between a feed main pipe 6 and a return main pipe 8. The nonfreezing solution flows in the heat radiating pipe 7, the heat of the nonfreezing solution is transmitted and stored in the road surface 14 from the heat radiating pipe 7, and the heat is radiated from the road surface 14 to melt snow.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a waterless snow removal method for melting snowfall and accumulated snow in cold regions with heavy snowfall, and in particular, a method for producing antifreeze at a constant temperature using a boiler with high thermal efficiency. This invention relates to a waterless snow removal method that allows antifreeze at a predetermined temperature to be passed through heat dissipation pipes buried in the road surface to quickly melt snow on the road during snowfall.

[Conventional technology]

Conventionally, the four non-sprinkling methods of extinguishing are JP-A No. 62-2285.
As disclosed in Publication No. 02, hot water is created by combustion in a boiler and stored in a hot water storage tank, and this hot water is sent to the primary side of a heat exchanger to transfer heat to the secondary side of the heat exchanger. It is well known that a circulatory system is formed between heat dissipation pipes buried in the road surface, and the anti-freezing liquid inside receives heat on the secondary side of the heat exchanger and circulates, melting snow that falls on the road surface. It was getting worse.

[Problem that the invention sought to solve]

However, in such conventional waterless snow skiing methods, a heat exchanger is interposed between the heat source boiler and the radiator pipes, making the facility large, making maintenance complicated and expensive. . Furthermore, since a heat exchanger is interposed in the middle, the total volume of the pipe increases, and it takes time to heat the antifreeze, making it difficult to extinguish lightning quickly.

Furthermore, it was difficult to ensure good operating conditions for the facility, and since it was based on experience, lightning could not be quickly extinguished, and operating costs were high.

Therefore, the present invention eliminates the above-mentioned drawbacks, and creates antifreeze at a constant temperature of 60'C or less in a tank using a boiler with good thermal efficiency, and by passing antifreeze at a predetermined temperature through heat dissipation pipes buried in the road surface, the antifreeze is immediately effective. The object of the present invention is to provide a non-sprinkling snow skiing method that can exhibit a certain lightning extinguishing effect, is easy to maintain, and has low equipment costs.

[Means to solve the problem]

In order to achieve the above object, the present invention keeps antifreeze in a tank at a constant temperature and stores it using a boiler installed on the ground, and when it snows, the antifreeze in the tank and the heat dissipation pipe buried in the road surface are cooled. A waterless snow skiing method using boiler heating, characterized in that the antifreeze solution is mixed with a three-way mixing valve to reach a predetermined temperature, and the antifreeze solution is sent to the heat dissipation tube to melt the snow falling on the road surface and also to prevent freezing. In addition, on one side of the tank filled with antifreeze, a circulation heating pipe that circulates with the boiler is formed via a circulation pump, and on the other side of the tank there are a main feed pipe, a heat dissipation pipe buried in the road surface, and a return pipe. A circulating heat dissipation pipe consisting of a pipe is formed via a circulation pump, and antifreeze at a constant temperature of 60°C or less is always stored in the tank by the circulating heating pipe, and when it snows, the antifreeze in the tank and the above The low-temperature antifreeze in the circulating heat dissipation pipe is mixed with a three-way mixing valve, and the antifreeze at a predetermined temperature is sent to the circulating heat dissipation pipe, and the heat radiated from the antifreeze flowing inside the heat dissipation pipe stores heat in the road surface and radiates it onto the road surface. This is a waterless snow skiing method using boiler heating, which is characterized by melting the snow falling on the road surface and preventing it from freezing.

[Effect]

The waterless snow skiing method using boiler heating of the present invention stores antifreeze at a constant temperature of 60°C or less in a tank by heating the boiler during the winter, and constantly maintains it at a constant high temperature to store heat. When there is a risk of road surface freezing, a signal emitted by a snowfall detector activates a circulation pump connected to a heat radiation pipe, which sends high-temperature antifreeze in the tank, while also discharging the low-temperature antifreeze that was originally in the pipe. of antifreeze is returned to the tank, but a portion of this low-temperature antifreeze is sent to the mixing three-way valve through a short-circuit pipe installed in front of the tank entrance and exit, and then flows from the tank into the main pipe. It is mixed with the flowing antifreeze at the rich temperature, and the temperature reaches a predetermined temperature optimal for extinguishing lightning by the action of the temperature detection device, and is sent from the main feed pipe to the heat radiation pipe.

In this way, antifreeze liquid at a predetermined temperature is circulated within the heat dissipation pipes, and the heat released by the antifreeze liquid uniformly stores heat inside the pavement and radiates it onto the road surface, melting snow falling on the road surface uniformly in a short period of time. It can also be used to prevent freezing.

Furthermore, when snow has stopped falling and the road surface is dry and there is no danger of freezing, the circulation of antifreeze on the heat dissipation pipe side is automatically stopped in response to a signal emitted by the snowfall detector.

〔Example〕

Next, an embodiment of the waterless snow sliding method using boiler heating according to the present invention will be described with reference to the drawings.

Figures 1 and 2 show an embodiment of the present invention, in which a boiler 2 and a tank 3 are installed in a hangar 1, connected to each other by a circulation heating pipe via a circulation pump 4. Since the antifreeze in the tank 3 is kept at a constant temperature of 60°C or less and stored, heat loss due to heat radiation can be extremely reduced.For this purpose, a temperature detection device 15 is provided in the tank 3. This temperature detection device 15 is connected to the boiler 2
and is connected to issue an operation stop signal to the circulation pump 4.

Note that the boiler 2, tank 3, and circulation pump 4 can be integrated into one unit to reduce the size.

On the other hand, the antifreeze outlet provided on the other side of this tank 3 is connected via a circulation pump 5 to a main feed pipe 6, a heat radiation pipe 7, a main return pipe 8,
It is connected to the inlet of the tank 3 to form a circulating heat radiation pipe. Further, the main sending pipe 6 is provided with a temperature detecting device 9 for antifreeze flowing through the circulating heat radiation pipe, and a short circuit pipe 10 for temperature adjustment is provided between the main sending pipe 6 and the main return pipe 8. A three-way mixing valve 11 is arranged in a communicating portion with the main feed pipe 6.

A snowfall detector 12 and an operation panel 13 are also installed, and are arranged so that the circulation pump 5 is stopped in response to a signal generated by the snowfall detector 12.

Furthermore, the heat dissipation tubes 7 are buried in the road surface 14 at a depth of 3 cm to 10 ann from the surface to the center of the heat dissipation tubes 7, and with an interval of 100 to 20 ann, and the material of the heat dissipation tubes is is made of steel pipes or polymer resin pipes. In the case of steel pipes, the end surfaces of the steel pipes are brought into contact with each other, and the abutting part is irradiated with a focused high-energy welding beam to melt it, and at the same time, argon gas is injected into the molten part. The spray from the nozzle is rapidly cooled to form a welded joint. The crystal structure of the heat-affected zone of the welded joint formed by this welding method is from the weld metal toward the steel pipe base metal: martensitic structure, mixed structure of martensite and fine pearlite, fine pearlite structure, and pearlite structure of the steel pipe base metal. It changes, but
Because it has a small heat-affected width and a smooth solution surface, it is resistant to bending and has load-bearing properties, so it is more effective when buried in the road surface and used as a heat dissipation tube.

A steel pipe or a polymer resin pipe made of such material is used as the heat dissipation tube 7, and the inner diameter of the heat dissipation tube is 9rm~36mm, and the buried form has an appropriate shape such as a meandering bent shape, a parallel shape, or a zigzag shape. Buried. Further, it is also possible to fix a steel net on the upper or lower surface of the heat dissipation tube to promote heat conduction.

In the circulating heat dissipation pipe line formed by the heat dissipation pipe and the boiler buried and fixed in this way, an antifreeze solution having a pH of 7.0 to 13.0 and a concentration of rA adjusted to 5% by weight to 55% by weight is preferably used. is filled with propylene glycol, ethylene glycol, etc.

In the waterless snow skiing method using boiler heating according to the present embodiment configured as described above, the boiler 2 and the circulation pump 4 are controlled by the signal emitted by the temperature detection device 15 installed in the tank 3 during winter.
is repeatedly started and stopped, and the antifreeze in tank 3 is drained to 60%.
Store heat by keeping it at a constant temperature below ℃.

Snowfall detector 1 when it is snowing or there is a risk of freezing on the road surface
2 is emitted (circulation pump 5 starts operating by No. 2,
The high-temperature, constant-temperature antifreeze in the tank 3 is sent to the heat radiation pipe 7 buried in the road surface 14, but the main feed pipe 6 and the main return pipe 8
Antifreeze at a predetermined temperature of 15°C to 20°C can be efficiently obtained by the short-circuit pipe 10 provided between the two, the mixing three-way valve 11, and the temperature detection device 9, and the flow rate is 0.3m/sec to 1.5m/sec. The heat of this warm antifreeze liquid is transferred from the heat radiation pipe to the road surface 14 and is stored therein, and the heat of this warm antifreeze liquid is transferred from the heat radiation pipe to the road surface 14 and stored there.
4. Heat can be radiated from above to uniformly melt snow falling on the road surface within a short period of time and to prevent freezing.

When antifreeze at a predetermined temperature is sent to the circulation heat radiation pipe line formed by the tank 3, the main feed pipe 6, the heat radiation pipe 7, and the return main pipe 8 in this way, the temperature of the antifreeze in the tank 3 decreases; The volume ratio of the circulation heat radiation pipe and the tank 3 is 1:0.3 to 0.
5, it is sufficient for the temperature inside tank 3 to be below 60°C,
Therefore, there is less loss due to heat radiation, and the short-circuit pipe 10
By effectively utilizing the antifreeze at about 6° C., the antifreeze at 15° C. to 20° C., which is necessary for non-sprinkling water lightning extinguishing, can be sent into the main feed pipe 6 in an energy-saving and efficient manner.

When the temperature inside the tank decreases to below a certain temperature, the temperature detection device 15 installed inside the tank 3 issues a signal, and the boiler 2 and circulation pump 4 operate, causing the tank to
Since the antifreeze inside the boiler 2 is kept at a constant temperature of 60 degrees Celsius or less and heat is stored, the fuel consumption of the boiler 2 can be reduced.

Furthermore, when the snow has stopped falling and the road surface is dry and there is no danger of freezing, the operation of the circulation pump 5 is automatically and promptly stopped by the signal generated by the snowfall detector 12, so there is no energy loss 6. This can be carried out by appropriately providing on road surfaces such as, for example, slopes, expressway toll gates, intersection sidewalks, crosswalk bridges, stairs, roadways, runways at airports, and wharves at ports.

〔Effect of the invention〕

Since the present invention has the configuration as described above, it has the following effects.

As a waterless lightning extinguishing heat source by burning boiler fuel,
Antifreeze is stored at a constant temperature of 60 degrees Celsius or less, and heat is stored, so there is extremely little heat loss due to heat radiation from the tank, and when it snows or there is a risk of freezing, it quickly returns to the predetermined temperature that is optimal for lightning extinguishing. This adjusted antifreeze is quickly sent into the heat dissipation pipe.
It is possible to uniformly store the heat of the antifreeze at a predetermined temperature within the road surface and radiate the heat onto the road surface, thereby uniformly melting snow falling on the road surface within a short time and preventing freezing.

In addition, when the snow stops falling and the road surface is dry and there is no danger of freezing, the facility operation is automatically stopped by a signal issued by the snowfall detector, and the flow of antifreeze in the heat dissipation pipes is stopped, so there is no energy loss. In addition, the operating cost is low, and the antifreeze in the heat dissipation pipes does not freeze and damage the pipes, making maintenance easy.

Furthermore, since the present invention does not require a heat exchanger, the present invention has many advantages such as high thermal efficiency, low facility costs, and extremely low heat loss.

[Brief explanation of drawings]

FIG. 1 is an explanatory cross-sectional view showing one embodiment of the present invention, and FIG. 2 is an enlarged perspective view of the main parts. 1... Hangar, 2... Boiler 3...
Tank, 4, 5... Circulation pump, 6... 8... 10... 12... 14... Main feed pipe, main return pipe, short circuit pipe, snowfall detector, road surface. 7... 9... 11... 13... Heat radiation pipe, temperature detection device, mixing three-way valve, operation panel, agent Tetsuro Abe

Claims (3)

[Claims] (1) The antifreeze in the tank is always kept at a constant temperature and stored using a boiler installed on the ground, and when it snows, the antifreeze in the tank is mixed with the cooled antifreeze in the heat radiation pipe buried in the road surface using a three-way valve. A waterless snow melting method using boiler heating, characterized in that antifreeze mixed to a predetermined temperature is sent to the heat dissipation tube to melt snow falling on the road surface and prevent freezing. (2) On one side of the tank filled with antifreeze, a circulation heating pipe that circulates with the boiler is formed via a circulation pump, and on the other side of the tank, there is a main feed pipe, a heat radiation pipe buried in the road surface, and a return pipe. A circulating heat dissipation pipe consisting of a pipe is formed via a circulation pump, and high temperature antifreeze is always stored in the tank by the circulation heating pipe.
The antifreeze liquid maintained at a constant temperature of 0°C or less and the low-temperature antifreeze liquid in the circulation heat radiation pipe are mixed by a three-way mixing valve, and the antifreeze liquid at a predetermined temperature is sent to the circulation heat radiation pipe, and the inside of the heat radiation pipe is mixed. A non-sprinkling snow melting method using boiler heating, characterized in that heat is stored in the road surface by heat radiation of flowing antifreeze fluid, and the heat is radiated onto the road surface to melt snow falling on the road surface and prevent freezing. (3) The ratio of the total volume of the circulation heat dissipation pipe to the volume of the tank is 1:0
．． 3. The waterless snow removal method using boiler heating according to claim 2, wherein the snow melting temperature is 3 to 0.5.