JPS61122306A - Two-stage type cycle absorption heat pump type snow melting apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a two-stage cycle absorption heat pump type snow melting device.

As is well known, in snowy regions, a considerable amount of snowfall is recorded every year.
A lot of snow damage is occurring. Therefore, in order to prevent this, the need for snow melting or lightning extinguishing measures has been recognized, and various devices have been proposed and implemented. Conventional equipment can be broadly classified from the viewpoint of snow melting heat sources: equipment that uses solar heat, equipment that uses geothermal heat, equipment that uses waste heat from equipment, equipment that melts snow using electric heat, and equipment that obtains heated water using heating equipment. hand,
There are devices that melt snow using this technology.For example, devices that use solar heat are JP-A No. 59-21807 and Utility Model Application No. 59-8.
Seen in Publication No. 0052. In addition, devices using geothermal heat include a snow melting method using hot spring heat as seen in JP-A-54-102029, and JP-A-55-10160.
8 and Utility Model Application Publication No. 57-164114, there are snow melting devices using geothermal heat, etc. Devices that utilize the waste heat of 0 equipment include JP-A-55-114701 and Utility Model Application Publication 59-1723. There is a device seen in the publication. A device using electric heating is found in Japanese Utility Model Application Publication No. 105506/1983. Furthermore, as a device for obtaining heated water and melting snow using it, there is a lightning extinguishing device using heated water as seen in JP-A-51-38741, and JP-A-57-18.
Device seen in Publication No. 0705, JP-A-55-1213
There is a snow-melting ice-making device as seen in Publication No. 65.

Among the above, devices that melt snow using solar heat, geothermal heat, and waste heat from equipment have the major characteristics of being energy efficient and having low operating costs. 15
16. ,Yo,. ,6. There are drawbacks such as limitations on gloss and operation time, and in particular, there are restrictions on location conditions that prevent it from being applied arbitrarily. In addition, in the case of a snow melting device that uses electric heat or a heating device that obtains heated water to melt snow, it is easy to obtain snow melting water at the desired temperature, and the operation time is flexible without being restricted by location conditions. Although it is advantageous in terms of operation, it requires fuel and electricity and is energy-consuming.
The snow melting device seen in Publication No. 5 heats snow melting water in the heat receiving pipe of the heating device by operating a heat pump equipped with a compressor, a condenser, a double tension valve, and an evaporator, and then heats the snow melting water on the roof, etc. It melts snow by sprinkling water, but it is possible to heat the water for snow melting according to the snow melting conditions, control the required amount of water, control the operating time, and do not have many restrictions on location, so it is easy to operate. Although this method is practical, it has the disadvantage that it requires electric power to drive the compressor to operate the heat pump.

The present invention has been developed in view of these points, and it is easy to obtain snow melt water at a temperature suitable for snow melting, the operating time can be controlled arbitrarily, and it can be installed without being restricted by location conditions. To provide an energy-saving snow melting device that does not require a pump, compressor, etc. for heating.

That is, the present invention comprises a first stage comprising an evaporator, an absorber, a generator, and a condenser and using sulfuric acid (H2SO4) as a circulating medium;
It is equipped with a second stage absorption heat pump. Well water near the snow melting site is used as a heat source for evaporating the solvent in the evaporator of the first-stage absorption heat pump and as a heat source for concentrating sulfuric acid in the generator of the first-stage absorption heat pump. And the first
The hot water obtained by indirectly exchanging heat with the sulfuric acid solution in the absorber of the first-stage absorption heat pump or the sulfuric acid solution flowing from the absorber toward the generator is used to evaporate the solvent in the evaporator of the second-stage absorption heat pump. It is used as a heat source and a heat source for concentrating sulfuric acid in the generator of the second stage absorption heat pump. Furthermore, hot water obtained by indirectly exchanging heat with the sulfuric acid solution in the absorber of the second stage absorption heat pump or the sulfuric acid solution flowing from the absorber toward the generator.

The snow is circulated through a snow melting pipe installed under the snow to melt the snow.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The number A indicates the first stage absorption type heat pump, and the number B indicates the second stage absorption type heat pump. The first stage absorption heat pump A consists of an evaporator IA, an absorber 2A, a generator 3A, and a condenser 4A, and these devices are communicated with each other by the following conduits. That is, the evaporator IA and the absorber 2A are communicated through a solvent conduit 5A. Above, between the absorber 2A and the generator 3A is a conduit 6 that sends the diluted sulfuric acid solution, in which the solvent has been absorbed into the concentrated sulfuric acid, to the generator 3A.
A and a conduit 7A through which sulfuric acid concentrated by evaporation of the solvent in the generator 3A returns to the absorber 2A.

A conduit 8A is connected between the generator 3A and the condenser 4A through which the solvent evaporated in the generator 3A goes to the condenser 4A. A conduit 9A is connected for returning the solvent condensed in the vessel 4A to the evaporator IA. Three feed pumps are installed at the necessary tube locations of each conduit, and in the example shown in the figure, No. 10
They are shown in A, IIA, 12A.

The configuration of the second stage absorption heat pump B is also substantially the same as that of the first stage absorption heat pump A, and the same components as those of the first stage absorption heat pump A are given the same reference numerals. . However, to distinguish it from the components of the first-stage absorption heat pump A, the symbol A is replaced by B.

Next, in order to use the well water pumped by the submerged ice pump 14 from the water sampling well 13 constructed near the snow melting area and location as a heat source of evaporation of the solvent in the evaporator 1A that constitutes the first stage absorption heat pump A, A well connected to the submerged pipe 14 is used for indirect heat exchange with the sulfuric acid solution and used as a heat source for concentrating the dilute sulfuric acid solution in the generator 3A. Water pipe system 1
The well water pipe system 16 is led to the evaporator IA to form a heat exchanger 17, and the other well water pipe system 18 is led to the generator 3A to form a heat exchanger 19.

The well water that has passed through each of the heat exchangers 17 and 19 is discharged into the reinjection well 20, for example.

Next, the hot water obtained by indirectly exchanging heat with the sulfuric acid solution flowing from the absorber 2A of the first stage absorption heat pump A to the generator 3A is transferred to the heat source for solvent evaporation in the evaporator IB of the second stage absorption heat pump B. At the same time, the conduit 6 of the first stage absorption heat pump A is used as a heat source for concentrating sulfuric acid in the generator/vessel 3B.
The hot water pipe system 22 led out from the heat exchanger 21 placed in A is
One hot water pipe system 23 is led to the evaporator IB of the second stage absorption heat pump B to form a heat exchanger 24, and the other hot water pipe system 25 is led to the generator 3B to form a heat exchanger. 2
6. The hot water that has passed through each of the heat exchangers 24 and 26 is circulated to the heat exchanger 21 by a circulation pump 27. Furthermore, heat is exchanged indirectly between the dilute sulfuric acid solution flowing from the absorber 2B of the second stage absorption heat pump B toward the generator 3B and the circulating fluid, and the heat of the circulating fluid is transferred to the portion for snow melting. In order to dissipate heat, the heat exchanger 28 arranged in the conduit 6B is connected to the snow melting pipe 29 installed under the road surface, building floor, wall surface, ceiling, etc. where the snow is to be melted, and a circulating fluid pipe system 31 having a circulation pump 30. Ranel.

Further, the snowmelt water in the ice storage section 32 is led to the condensers 3H4A and 4B of the first and second stage absorption heat pumps A and H by the water supply pump 33 and conduit 34, respectively, and the solvent is condensed in each condenser. used for.

To explain the series of snow melting operations in the above embodiment, the solvent condensed and returned to the evaporator IA of the first stage absorption heat pump A is transferred from the water sampling well 13 to the heat exchanger 17 via the well water pipe system 15 and 16. The water is indirectly heat exchanged with well water at about 15 to 18° C., evaporated, and guided to the absorber 2A via the conduit 5A.

In the absorber 2A, the above-mentioned solvent is absorbed into the concentrated sulfuric acid returned via the conduit 7A, producing a dilute sulfuric acid solution at a temperature higher than the solvent temperature, for example, about 25°C. The dilute sulfuric acid solution flows countercurrently to the generator 3 via conduit 6A by feed pump IOA. In the process, heat exchanger 21
, the hot water is indirectly exchanged with the hot water in the hot water pipe system 22 to receive heat, and the hot water is transferred to each heat exchanger 24. of the evaporator IB of the second stage absorption heat pump B and the generator 3B.
26 and circulated again. On the other hand, the dilute sulfuric acid solution leaving the heat exchanger 21 enters the generator 3A where it enters the water sampling well 13.
Heat is exchanged indirectly from the well water to the well water led to the heat exchanger 19 via the well water conduit 15, 18, and the solvent in the dilute sulfuric acid solution is evaporated. The sulfuric acid from which the solvent has been evaporated is sent to the absorber 2A via conduit 7A by feed pump IIA, while the solvent evaporated from generator 3A is sent to condenser 4A via conduit 8A. It will be done. aIl
i! The water in the ice storage section 32 that stores snowmelt water is sent to the heat exchanger of the container 4A via the conduit 34 by the water supply pump 33, so that the solvent is condensed by the water, and the water is sent to the heat exchanger of the water supply pump 12A again. evaporator I via conduit 9A
Sent to A.

Now, the hot water that has been indirectly heat exchanged with the sulfuric acid solution in the heat exchanger 21 of the first stage absorption heat pump A is heated in the hot water pipe system 22.23.
is led to the evaporator heat exchange base 24 of the second-stage absorption heat bomb B, and evaporates the solvent in the evaporator IB. The evaporated solvent is absorbed into sulfuric acid in absorber 2B, producing a dilute sulfuric acid solution at a temperature above the solvent temperature. The sulfuric acid solution flows countercurrently to generator 3B via conduit 6B. During this process, heat is exchanged indirectly with the circulating fluid in the circulating fluid pipe 31 at the heat exchanger 28, and the heated circulating fluid is transferred to the circulating fluid in the circulating fluid pipe 28 under the snow.
The heat flows countercurrently to the snow and radiates heat toward the snow, melting the snow. On the other hand,
The dilute sulfuric acid solution leaving the heat exchanger 28 enters the generator 3B, where it indirectly exchanges heat with the hot water flowing in via the hot water conduit 22.25 at the heat exchanger 26 to form the dilute sulfuric acid solution. The solvent inside is allowed to evaporate. Thereafter, similarly to the first stage absorption heat pump, the solvent is evaporated and the concentrated sulfuric acid is returned to the absorber 2B by the feed pump IIB, and the solvent evaporated in the generator 3B is sent to the condenser 4B. .

'+1 to the heat exchanger of this condenser 4B, ya, yoka, 2□
Ah,. One by one, □ is sent to the evaporator IB.

In the above example, the hot water sent for heat exchange between the evaporator 2B and generator 3B of the second stage absorption heat pump B is:
Although an example has been shown in which the heat exchanger 21 is provided in the conduit 6A, the heat exchanger 21 may be provided in the absorber IB itself of the first stage absorption heat pump A. Although an example has been shown in which the liquid is indirectly heat exchanged at the heat exchanger 28 arranged in the conduit 6B in the second stage absorption heat pump B, it is also possible to arrange the heat exchanger 28 in the absorption heat pump 28 itself. In this way, snow on roads, building floors, ceilings, etc. in the snow melting area is melted, but well water is used to heat the circulating fluid for snow melting to the required temperature. This absorption heat pump uses sulfuric acid as a circulating medium, and is a two-stage absorption heat pump.The operation of this absorption heat pump, which uses sulfuric acid as a circulating medium, is performed using natural well water from a sampling well, and the compressor is Since there is no driving involved, it is possible to melt snow while saving energy.

In addition, if well water is secured near the area or place where snow melting is to be performed, sufficient operation can be achieved, so even in places where there is no hot spring source or waste heat from equipment, there are no restrictions on location. However, it can also be carried out at night. In normal areas, the temperature of well water at about 10 meters underground is about the same as the annual average temperature of the alley surface, so there is no problem with driving.

By returning well water from the sampling well to the reinjection well, the impact on groundwater can be eliminated as much as possible.

As described above in detail, the present invention is equipped with a one-stage and two-stage absorption heat pump consisting of an evaporator, an absorber generator, a condenser, and using sulfuric acid (H2S04) as a circulating medium, lead to the evaporator and generator of the single-stage absorption heat pump,
A well water pipe system to evaporate the solvent by indirectly exchanging heat with the solvent in the evaporator and concentrating the sulfuric acid by indirectly exchanging heat with the sulfuric acid solution in the generator, and the absorber of the first stage absorption heat pump. The heat received therefrom is indirectly exchanged with a dilute sulfuric acid solution flowing within or from the absorber to the generator.
Guided to the evaporator and generator of the second stage absorption heat pump,
A circulating hot water pipe system for evaporating the solvent by indirectly exchanging heat with the solvent in the evaporator and concentrating the sulfuric acid by indirectly exchanging heat with the sulfuric acid solution in the generator, and a second stage absorption heat pump. A snow melting system that indirectly exchanges heat with the dilute sulfuric acid solution flowing inside the absorber or from the absorber to the generator, and uses the heat received from it to melt the snow, which is installed under the snow on roads, building floors, walls, ceilings, etc. It is a two-stage cycle absorption heat pump type snow melting device that is characterized by having a circulating fluid pipe system that leads to a pipe and radiates heat to the snow side, so in order to obtain water for snow melting, a compressor etc. is driven and electric power etc. We can provide energy-saving snow melting equipment because there is no need for additional equipment, and we also provide highly practical snow melting equipment that can be installed and operated as desired without any restrictions on location conditions or operating hours. It is possible.

[Brief explanation of the drawing]

The attached drawing is a system diagram showing an embodiment of the present invention, and in the drawing A
is a single-stage absorption heat pump, B is a two-stage absorption heat pump, IA, IB are evaporators, 2A, 2B are absorbers, 3A,
3B is a generator, 4A, 4B are condensers, 5A, 5B are conduits, 6A, 6B are dilute sulfuric acid solution conduits, 7A, 7B are continuous sulfuric acid conduits, 8A, 8B are conduits, 9A, 9B are solvent conduits , 13 is a water sampling valve, 14 is a submersible pump, 15°16.1
8 is the well water pipe system, 17.19 is the heat exchanger. 20 is the reinjection well, 21, 24.26 is the heat exchanger, 22.2
3.25 is a hot water pipe system, 28 is a heat exchanger, 29 is a snow melting pipe, 31 is a circulating fluid pipe system, 32 is a water reservoir, and 34 is a conduit.

Claims (1)

[Claims] Consists of an evaporator, absorber, generator, and condenser.
Equipped with one-stage and two-stage absorption heat pumps that use 2SO_4) as a circulating medium, well water is introduced into the evaporator and generator of the first-stage absorption heat pump, and is indirectly heat-exchanged with the solvent in the evaporator. A well water pipe system for evaporating sulfuric acid and indirectly exchanging heat with the sulfuric acid solution in the generator to concentrate the sulfuric acid, and dilute sulfuric acid flowing in or from the absorber of the first stage absorption heat pump toward the generator. By indirectly exchanging heat with the solution,
The received heat is then guided to the evaporator and generator of the second stage absorption heat pump, where it is indirectly exchanged with the solvent in the evaporator to evaporate the solvent, and also indirectly exchanged heat with the sulfuric acid solution in the generator. A circulation hot water pipe system for concentrating sulfuric acid, and heat received through indirect heat exchange with the dilute sulfuric acid solution flowing in the absorber of the second stage absorption heat pump or from the absorber toward the generator. A two-stage cycle absorption heat pump type characterized by having a circulating fluid pipe system for guiding the snow to a snow melting pipe installed under the snow on the road surface, building floor, wall surface, ceiling, etc. to be melted, and radiating heat to the snow side. Snow melting equipment.