JPH10292334A - Operation method of snow-thawing device with splinkling water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To spare fuel for a boiler and conserve energy. SOLUTION: Hot water in a heat-accumulation tank 7 is heated by a boiler 11. River water and recovered water is conducted in a treatment water tank 3. The water in the treatment water tank 3 and the hot water in the heat- accumulation tank 7 are conducted into a mixing tank 4 and mixed therein. The water (about 4-5 deg.C) in the mixing tank 4 is splinkled on a road face to thaw snow. When the water is not sprinkled, the hot water in the heat- accumulation tank is kept within 20-35 deg.C to reduce the naturally dissipating heat. When thawing snow with splinkled water, the hot water in the heat- accumulation tank 3 is kept within 35-50 deg.C. When the water temperature of the treatment water tank 3 is lower than 4 deg.C, hot water is supplied from the heat-accumulation tank 7 to the mixing tank 4 and when the water temperature of the treatment water tank 3 is higher than 4 deg.C, the hot water which is supplied from the heat-accumulation tank 7 to the mixing tank 4, is suspended.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating a snow melting facility for spraying water, and relates to a facility for sprinkling water mixed with hot water and cold water (river water and recovered water) boiled on a road for snow melting. It is devised so that the consumption of fuel used in the boiler can be reduced.

[0002]

2. Description of the Related Art In regions with heavy snowfall, sprinkling snow melting facilities are installed on roads in order to ensure road operation without removing snow from the roads. Sprinkling snow melting equipment is a device that melts snow on a road by spraying water on the road when snow falls. As such a sprinkling snow melting facility, there is a type of spraying water (temperature of about 4 ° C. to 5 ° C.) obtained by mixing hot water boiled with boiler and cold water (river water and recovered water) on a road.

[0003] A water-sprinkling snow-melting facility of the type in which water mixed with hot and cold water fired by a boiler is sprayed on a road is mainly composed of a treated water tank, a mixing tank, a heat storage tank, and a boiler.

[0004] River water taken in from the river and collected water that has collected water sprinkled on the road surface flow into the treated water tank, and the water is stored. The temperature of the water stored in the treated water tank is about 2 ° C.

[0005] In addition, water taken in from the river flows into the heat storage tank and is stored. In addition, the water stored in the heat storage tank is heated by the boiler, and is used as hot water of about 50 ° C. when water is melted. When water is not sprayed even in winter (when there is no snowfall), heating by the boiler is stopped when the temperature of the heat storage tank reaches 50 ° C, and when the temperature of the water in the heat storage tank reaches 20 ° C. To start heating by
The water in the heat storage tank is maintained at about 20 ° C. to about 50 ° C. and is in a standby state.

In the mixing tank, water from the treatment water tank (about 2
° C) and water from the heat storage tank (warm water at about 50 ° C) flows in and mixes, and water at about 4 ° C to 5 ° C is stored. The water (about 4 ° C. to 5 ° C.) in the mixing tank is sprinkled on a road and used for melting snow. Part (about 50%) of the sprinkled water is collected as collected water in the treated water tank via a collection gutter and a collection tank installed on the road.

[0007] As described above, a water-sprinkling snow-melting facility of the type that performs snow-melting by using hot water is employed in an area where a large amount of river water cannot be taken. In such areas, the lack of water is compensated for by collecting sprinkled water. However, since the temperature of the recovered water is very low, about 0 ° C., the water is mixed and then sprinkled as described above.

[0008] The temperature of river water is 5 ° C even in winter.
Since it is above the level, in an area where a large amount of river water can be taken, it is possible to melt snow by spraying the river water as it is (without mixing hot water).

[0009]

By the way, the conventional water-sprinkling snow-melting equipment of the type in which hot and cold water mixed with boiler-fired water is sprinkled on roads has no snowfall even in winter and requires no water sprinkling. Then, the heating by the boiler is stopped when the temperature of the water in the heat storage tank reaches 50 ° C, and the heating by the boiler is started when the temperature of the water in the heat storage tank reaches 20 ° C. It is kept at 20 ° C to about 50 ° C.

[0010] More specifically, a heat insulating material is mounted on the outer surface of the heat storage tank, and the internal water (hot water) is heated by boiler heating.
Is 50 ° C. in the beginning, but the holding temperature decreases due to natural heat radiation. Then, in half a month to January, the temperature becomes about 25 ° C. On the other hand, the boiler that heats the hot water in the heat storage tank is controlled to start when the temperature of the hot water in the heat storage tank reaches 20 ° C and stop when the hot water in the heat storage tank reaches 50 ° C.

Here, the amount of natural heat radiation is proportional to the difference between the temperature of hot water and the temperature of outside air. Therefore, the higher the temperature is maintained, the greater the amount of heat loss, and wasteful use of boiler fuel. Conventionally, even during standby, since the temperature of the hot water is raised to 50 ° C., the amount of heat loss is large, and the consumption of boiler fuel is large.

When a snowfall sensor detects that snow has fallen, a hot water pump (a pump for supplying hot water from the heat storage tank to the mixing tank) is activated, and hot water is supplied from the heat storage tank to the mixing tank. . The amount of hot water supplied to the mixing tank is
It is controlled by the temperature of the mixing tank. When the temperature of the water in the mixing tank exceeds the target temperature (4 ° C. to 5 ° C.), the supply of hot water is stopped. I try to make it. However, the response speed of this control system is very slow, so even if the temperature of the water in the mixing tank is higher than the target value,
Unnecessary hot water was supplied, resulting in waste of energy (boiler fuel waste).

The present invention has been made in view of the above-mentioned prior art, and has as its object to provide a method for operating a water-sprinkling snow melting facility that can reduce the consumption of fuel used in a boiler.

[0014]

The structure of the present invention for solving the above-mentioned problem is a process of storing water by flowing river water taken in from a river and collected water collected from water sprinkled on a road surface. A water tank, a heat storage tank for storing hot water obtained by heating river water taken from the river by the boiler section, and a mixing tank into which the water in the treatment water tank and the hot water in the heat storage tank flow. When the temperature of hot water in the heat storage tank reaches the intermediate temperature of hot water when water spraying or melting is expected to be required in water spraying and snow melting equipment that sprays water on the road surface for snow melting. The heating by the boiler unit was started, and the heating by the boiler unit was stopped when the temperature of the hot water reached the upper limit of the hot water, and the temperature of the hot water in the heat storage tank reached the lower limit temperature of the hot water during standby without water spray and snow melting. Start the heating by the boiler, the temperature of the hot water is characterized by stopping the heating by the boiler Once turned hot water intermediate temperature.

Further, the configuration of the present invention comprises a treated water tank for storing river water taken in from a river and collected water collected from water sprinkled on the road surface, and a river water taken from the river. It has a heat storage tank for storing hot water heated by the boiler section, and a mixing tank into which the water in the treatment water tank and the hot water in the heat storage tank flow, and the water in the mixing tank is put on the road surface of the road to melt snow. In the water-sprinkling snow-melting facility that sprays water, when the temperature of the water in the treated water tank is equal to or lower than a target temperature suitable for performing the water-melting and snow-melting at the time of water-melting and snow-melting, hot water is supplied from the heat storage tank to the mixing tank, In this case, when the temperature of the water in the treated water tank exceeds the target temperature, the supply of hot water from the heat storage tank to the mixing tank is stopped.

Further, the configuration of the present invention comprises a treatment tank for storing river water taken in from a river and collected water collected from water sprinkled on the road surface and storing the water, and a river water taken from the river. It has a heat storage tank for storing hot water heated by the boiler section, and a mixing tank into which the water in the treatment water tank and the hot water in the heat storage tank flow, and the water in the mixing tank is put on the road surface of the road to melt snow. In the sprinkling snow melting facility where water is sprinkled, when it is anticipated that it is necessary to perform the sprinkling snow melting or the sprinkling snow melting, the heating by the boiler unit is started when the temperature of the hot water in the heat storage tank reaches the intermediate temperature of the hot water. When the temperature of the hot water reaches the hot water upper limit temperature, the heating by the boiler unit is stopped, and at the time of standby without water spray snow melting,
When the temperature of the hot water in the heat storage tank reaches the lower limit temperature of the hot water, heating by the boiler is started, and when the temperature of the hot water reaches the intermediate temperature of the hot water, the heating by the boiler is stopped. When the temperature of the water is equal to or lower than the target temperature suitable for water-melting snow, the hot water is supplied from the heat storage tank to the mixing tank. When it exceeds, the supply of hot water from the heat storage tank to the mixing tank is stopped.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a water-sprinkling snow melting facility according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG.
1 shows a water-sprinkling snow melting facility according to the present embodiment for sprinkling water mixed with hot water and cold water fired by a boiler on a road. As shown in FIG. 1, a treatment tank 3 and a mixing tank 4 are formed by dividing a water tank 1 into two parts by a partition wall 2, and both tanks 3 and 4 communicate with each other at a lower portion.

In the treated water tank 3, river water taken in from a river and collected water that has collected water sprinkled on the road surface of the road 5 due to snow melting flows in through a pipe 6, and water is stored. The temperature of the recovered water is about 0 ° C., and the temperature of the river water is about 5 ° C. or more even in winter. Therefore, the temperature of the water stored in the treated water tank 3 is usually about 2 ° C. In addition,
When the amount of recovered water is small, the temperature of the water stored in the treated water tank 3 may be about 4 ° C. or more.

The water from the treated water tank 3 and the hot water (described later) supplied from the heat storage tank 7 flow into the mixing tank 4 and are mixed by a stirrer (not shown).
Of water will be stored. A watering pump 8 is installed in the mixing tank 4. When the watering pump 8 is driven, water in the mixing tank 4 is sent through a watering pipe 9 and is sprinkled on the road surface of the road 5 to remove snow. Unravel. The temperature of the sprinkled water is about 4 ° C-5
° C, so that snow can be melted well.
A part (approximately 50%) of the sprinkled water passes through a collecting gutter (not shown) and a collecting tank (not shown) provided on the road 5 and is collected as collected water in the treated water tank 3 through the pipe 6. You.

The river water taken in from the river flows into the heat storage tank 7 through the pipe 10, and the water is stored. Thermal storage tank 7
Has a circulation pipe 12 disposed through the boiler 11.
The boiler circulation pump 13 is interposed in the circulation pipe 12. When fuel is supplied to the boiler 11 under the control of the control box 11a and the boiler 11 is started (combusted) and the boiler circulation pump 13 is driven, the water in the heat storage tank 7 flows through the circulation pipe 12 and flows through the boiler 11 And heated to warm water. When water spraying and melting snow, the temperature of the hot water in the heat storage tank 7 should be 35 ° C to 5 ° C.
The temperature is set to about 0 ° C. (details will be described later). In addition, boiler 1
1, control box 11a, circulation pipe 12, boiler circulation pump 1
3, a boiler section for heating the hot water in the heat storage tank 7 is formed.

As will be described in detail later, when water spraying and melting snow, the hot water pump 14 is usually driven to supply the hot water in the heat storage tank 7 to the mixing tank 4 via the hot water pipe 15.

On the other hand, the temperature of the water stored in the treated water tank 3 is detected by the temperature sensor 21, the temperature of the water stored in the mixing tank 4 is detected by the temperature sensor 22, and the temperature of the water (hot water) stored in the heat storage tank 7 is detected. The temperature is detected by the temperature sensor 23.

The flow rate of the water supplied from the mixing tank 4 to the road 5 via the sprinkling pipe 9 is measured by a flow meter 24. Further, a snowfall sensor 25 for detecting whether or not snow is falling is arranged on the road 5.

Further, a temperature controller 31, a flow rate controller 32, a hot water controller 33 and a mode changeover switch 34 are provided.

The mode changeover switch 34 can be switched between a "normal operation mode" and an "energy saving operation mode" by manual operation by a human or remote operation (by a telemeter or the like). In other words, according to human judgment, the mode is switched to the “energy-saving operation mode” when the snowfall is unlikely to be predicted, and to the “normal operation mode” when the cold wave is likely to come due to the weather forecast.

Next, a control operation centered on each of the controllers 31 to 33 will be described.

First, the control operation centered on the temperature controller 31 will be described for each state.

(1) When the mode changeover switch 34 is in the "energy saving operation mode" and the snowfall sensor 25 detects that there is no snowfall. At this time, the temperature controller 31 performs the energy saving operation of the boiler 11. That is, when the temperature of the hot water in the heat storage tank 7 detected by the temperature sensor 23 becomes 20 ° C. (the lower limit temperature of the hot water), the control box 11 a supplies fuel to the boiler 11 and
(Combustion operation), and the boiler circulation pump 13 is driven. On the other hand, when the temperature of the hot water in the heat storage tank 7 rises to 35 ° C. (intermediate hot water temperature), the control box 1
At 1a, the supply of fuel to the boiler 11 is stopped to stop the boiler 11 (stop combustion), and the boiler circulation pump 13 is stopped (see FIG. 2).

With this arrangement, the hot water in the heat storage tank 7 is maintained within a temperature range of about 20 ° C. to 35 ° C. when there is almost no snowfall or when there is no snowfall.
As described above, in the standby state, the temperature of the hot water in the heat storage tank 7 is maintained in a low temperature range, so that the amount of natural heat radiation is halved compared to the related art, the fuel used in the boiler 11 is saved, and energy is saved. be able to. Such an effect is unique to the present invention.

(2) When the mode changeover switch 34 is in the "normal operation mode" or when it is detected by the snowfall sensor that there is snowfall. At this time, the temperature controller 31 operates the boiler 11 normally. That is, when the temperature of the hot water in the heat storage tank 7 detected by the temperature sensor 23 reaches 35 ° C. (the intermediate temperature of the hot water), the control box 11 a
To supply fuel to the boiler 11 to start the boiler 11 (combustion operation) and drive the boiler circulation pump 13. On the other hand, when the temperature of the hot water in the heat storage tank 7 rises to 50 ° C. (upper limit of the hot water temperature), the supply of fuel to the boiler 11 is stopped by the control box 11 a to stop the boiler 11 (stop combustion). Boiler circulation pump 1
3 is stopped (see FIG. 2).

In this manner, when snowfall is likely or when snowfall actually occurs, the hot water in the heat storage tank 7 is maintained within a temperature range of about 35 ° C. to 50 ° C. As described above, since the temperature of the hot water in the heat storage tank 7 is maintained in the high temperature range, by supplying the hot water in the heat storage tank 7 to the mixing tank 4, the water in the mixing tank 4 is quickly heated to an appropriate temperature (4 ° C.). ５5 ° C.). Such an effect is unique to the present invention.

Next, the control operation centered on the hot water controller 33 will be described for each state.

(1) When the absence of snowfall is detected by the snowfall sensor 25. At this time, the hot water controller 33 stops the hot water pump 14 and stops the supply of hot water from the heat storage tank 7 to the mixing tank 4.

(2) When the presence of snowfall is detected by the snowfall sensor 25 and the temperature of the water in the treated water tank 3 detected by the temperature sensor 21 is 4 ° C. or less. When the temperature of the water is 4 ° C., it is possible to satisfactorily melt the snow by spraying water. Therefore, in the present embodiment, the water temperature of 4 ° C. is set as the target temperature for watering and melting the snow. At this time, the hot water controller 33 drives the hot water pump 14 to supply hot water from the heat storage tank 7 to the mixing tank 4. In addition, the supply amount of the hot water is controlled so as to increase as the temperature of the water in the mixing tank 4 detected by the temperature sensor 22 decreases. For this reason, in the mixing tank 4, the cold water (4 ° C. or less) of the treatment water tank 3 and the warm water (35 ° C. to 50 ° C.) are mixed, and the temperature of the water in the mixing tank 4 is sprayed and melted. About 4 ° C. to 5 ° C.

When the snow sensor 25 detects that snow has fallen, and the temperature of the water in the treated water tank 3 detected by the temperature sensor 21 is 4 ° C. or less and the outside air temperature is 1 ° C. or less. Then, the above operation may be performed.

(3) When the presence of snowfall is detected by the snowfall sensor 25 and the temperature of the water in the treated water tank 3 detected by the temperature sensor 21 exceeds 4 ° C. (target temperature). At this time, the hot water controller 33 stops the hot water pump 14 and stops the supply of hot water from the heat storage tank 7 to the mixing tank 4. For this reason, hot water is not supplied to the mixing tank 4, but since the temperature of the water in the treated water tank 3, that is, the temperature of the water in the mixing tank 4 exceeds 4 ° C., the water is sprayed as it is (without mixing the hot water). By doing so, it is possible to melt snow satisfactorily.

Thus, the temperature of the water in the treatment water tank 3 is 4 ° C.
Is not supplied when the temperature of the boiler is exceeded.
It is possible to save fuel by using less fuel.
Such an effect is unique to the present invention.

Next, a control operation centered on the flow controller 32 will be described.

(1) When no snowfall is detected by the snowfall sensor 25. At this time, the flow controller 32 stops the watering pump 8 and stops watering from the mixing tank 4 to the road 5.

(2) When the snowfall sensor 25 detects that there is snowfall. At this time, the flow controller 32 drives the watering pump 8. For this reason, watering pipe 9
Water is supplied from the mixing tank 4 to the road 5 through the, and is sprinkled, and is used for melting snow. At this time, the supply water amount detected by the flow meter 24 becomes a predetermined water amount.
The flow controller 32 controls the rotation speed of the watering pump 8.

[0041]

According to the present invention, as specifically used in connection with the above embodiments, the river water taken in from the river and the collected water collected from the water sprinkled on the road surface flow into the water storage tank. A water storage tank for storing hot water formed by heating river water taken in from a river by a boiler unit, and a mixing tank into which the water in the processing water tank and the hot water in the heat storage tank flow. In a water-melting facility that sprays water from a tank on the road surface to melt snow, when it is anticipated that it will be necessary to perform water-melting or snow-melting, the temperature of the hot water in the heat storage tank will be set to the intermediate temperature of the hot water. When it is, start heating by the boiler section,
When the temperature of the hot water reaches the hot water upper limit temperature, the heating by the boiler unit is stopped, and in a standby state in which water spraying and melting do not occur, heating by the boiler is started when the temperature of the hot water in the heat storage tank reaches the hot water lower limit temperature, When the temperature of the hot water reaches the intermediate temperature of the hot water, the heating by the boiler is stopped.When the temperature of the water in the treated water tank is equal to or lower than a target temperature suitable for performing the snow melting, the heat storage is performed. When hot water is supplied from the tank to the mixing tank, and the temperature of the water in the treated water tank exceeds the target temperature during water spraying and snow melting,
The supply of warm water from the heat storage tank to the mixing tank was stopped.

As described above, in the present invention, the temperature of the hot water in the heat storage tank is maintained in a high temperature range (upper limit temperature of hot water to intermediate temperature of hot water) at the time of sprinkling snow melting or when it is anticipated that sprinkling snow melting is required. During the standby without watering, the temperature is maintained in the low temperature range (the intermediate temperature of the hot water to the minimum temperature of the hot water), so the natural heat radiation from the heat storage tank during the standby is halved compared to the conventional technology, and the fuel used in the boiler is saved. Energy saving.

Further, when the temperature of the water in the treated water tank exceeds the target temperature during the spraying and melting of snow, the supply of the hot water from the heat storage tank to the mixing tank is stopped, so that the hot water is not wasted. It is possible to save fuel by using less fuel.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a sprinkling snow melting facility according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a boiler operating method of the water-sprinkling snow melting facility according to the embodiment of the present invention in comparison with a conventional boiler operating method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water storage tank 2 Partition wall 3 Processing tank 4 Mixing tank 5 Road 6 Pipe 7 Heat storage tank 8 Water spray pump 9 Water spray pipe 10 Pipe 11 Boiler 11a Control box 12 Circulation pipe 13 Boiler circulation pump 14 Hot water pump 15 Hot water pipe 21, 22, 23 Temperature sensor 24 Flow meter 25 Snowfall sensor 31 Temperature controller 32 Flow controller 33 Hot water controller 34 Mode switch

Claims (3)

[Claims] Claims: 1. A treated water tank in which river water taken in from a river and collected water that has collected water sprinkled on a road surface enter and store water, and river water taken in from a river is heated by a boiler unit. Snow melting equipment that has a heat storage tank for storing hot water, and a mixing tank into which the water in the treated water tank and the hot water in the heat storage tank flow, and sprays the water in the mixing tank onto the road surface for snow melting. In the case of spraying snowmelt or when it is expected that it is necessary to perform snowmelt, when the temperature of the hot water in the heat storage tank reaches the intermediate temperature of the hot water, the heating by the boiler unit is started, and the temperature of the hot water is changed to the hot water. When the heating by the boiler section is stopped when the temperature reaches the upper limit temperature, and when the temperature of the hot water in the heat storage tank reaches the lower limit temperature of the hot water, the heating by the boiler is started in a standby state without spraying and melting the snow,
When the temperature of the hot water reaches the intermediate temperature of the hot water, the heating by the boiler is stopped. 2. A treated water tank in which river water taken in from a river and collected water that has collected water sprinkled on a road surface enter and store water, and river water taken in from a river is heated by a boiler unit. Snow melting equipment that has a heat storage tank for storing hot water, and a mixing tank into which the water in the treated water tank and the hot water in the heat storage tank flow, and sprays the water in the mixing tank onto the road surface for snow melting. In the case of water spraying and melting, when the temperature of the water in the treated water tank is equal to or lower than a target temperature suitable for performing water spraying and snow melting, supplying hot water from the heat storage tank to the mixing tank, When the temperature of the water in the treated water tank exceeds the target temperature, the supply of warm water from the heat storage tank to the mixing tank is stopped. 3. A treated water tank in which river water taken in from a river and collected water that has collected water sprinkled on a road surface flow in and store water, and river water taken in from a river is heated by a boiler unit. Snow melting equipment that has a heat storage tank for storing hot water, and a mixing tank into which the water in the treated water tank and the hot water in the heat storage tank flow, and sprays the water in the mixing tank onto the road surface for snow melting. In the case of spraying snowmelt or when it is expected that it is necessary to perform snowmelt, when the temperature of the hot water in the heat storage tank reaches the intermediate temperature of the hot water, the heating by the boiler unit is started, and the temperature of the hot water is changed to the hot water. When the heating by the boiler section is stopped when the temperature reaches the upper limit temperature, and when the temperature of the hot water in the heat storage tank reaches the lower limit temperature of the hot water, the heating by the boiler is started in a standby state without spraying and melting the snow,
When the temperature of the hot water reaches the intermediate temperature of the hot water, the heating by the boiler is stopped, and when water spraying and melting, when the temperature of the water in the treated water tank is equal to or lower than a target temperature suitable for water spraying and melting, When hot water is supplied from the heat storage tank to the mixing tank, and when the water is melted by spraying water, the supply of the hot water from the heat storage tank to the mixing tank is stopped when the temperature of the water in the treated water tank exceeds the target temperature. How to operate the snowmelting equipment.