JPH0227581B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vacuum conveyance system for low-temperature hot water that flashes and conveys low-temperature hot water.

[Conventional technology]

Geothermal energy is attracting attention from the perspective of saving energy and securing alternative energy to oil. Geothermal fluids range from high temperatures to medium to low temperatures depending on the region, and various measures must be taken to use them effectively, including measures to prevent the precipitation of various substances dissolved during storage underground (scale precipitation). is required.

Generally, hot water extracted from geothermal production wells is
A transport pump transports it through normal piping to the desired point where it is used. Therefore, when the transport path becomes long and the piping becomes long or the piping becomes complicated, the transportation power is increased.

[Problem that the invention seeks to solve]

However, in the above-mentioned conveyance system,
Depending on the thickness and length of the conveyor pipe and the complexity of the piping, it is necessary to install a fairly large-scale conveyor pump. Therefore, there is a drawback that the burden of equipment costs and maintenance costs for operation and maintenance increases. Furthermore, since the hot water is sent through normal piping, impurities contained in the hot water are also sent as they are. The impurities in this hot water precipitate as so-called scale, and adhere to the inner walls of piping and block the conveyance path, or adhere to hot water utilization equipment and cause various problems. As a result, even more equipment and costs are required to remove this.

The present invention is based on the above considerations, and includes:
The object of the present invention is to provide a vacuum conveyance system for low-temperature hot water that removes impurities contained in hot water and conveys it using inexpensive equipment and costs.

[Means for solving problems]

To this end, the present invention provides a vacuum conveyance system for low-temperature hot water that supplies low-temperature hot water to a hot water storage tower using a hot water supply pump and conveys the hot water from the hot water storage tower to hot water utilization equipment through a conveyance path. a vacuum pump connected to the end of the conveyance path to evacuate the inside of the conveyance path and the hot water storage tower; a level detection means for detecting the level of hot water stored in the hot water storage tower; and detection of the level detection means. Equipped with a drain means for removing hot water and impurities stored in the hot water storage tower according to the level, and air conditioning equipment interposed in the conveyance path between the hot water storage tower and the vacuum pump, and conveyed using the vacuum pump. The system is characterized in that the inside of the passage and the hot water storage tower are evacuated, and the hot water in the hot water storage tower supplied by the hot water supply pump is flashed to steam and is conveyed through the conveyance passage under vacuum. be.

[Effect]

In the vacuum conveyance system for low-temperature hot water of the present invention, when the vacuum pump is operated at the end of the conveyance path, the hot water stored in the hot water storage tower is flushed by reduced pressure, becomes steam, and its mass decreases and expands. and is automatically transported. Therefore, no other power is required for transportation, and the impurities remain in the hot water due to flashing.

〔Example〕

Examples will be described below with reference to the drawings.

The figure shows the configuration of one embodiment of the vacuum conveyance system for low-temperature hot water according to the present invention, in which 1 is a production well, 2
is a hot water supply pump, 3 is a hot water storage tower, 4 is air conditioning equipment, 5 is a conveyance pipe, 6 is a vacuum pump, 7 is hot water utilization equipment, 8 is a hot water level detector, 9 is a level controller, 10 indicate the drain valves.

In the figure, hot water extracted from a production well 1 is supplied to a hot water storage tower 3 by a hot water supply pump 2 and stored there. A transfer pipe 5 for sending hot water to a hot spring or other hot water utilization facility 7 is connected to the hot water storage tower 3, and a vacuum pump 6 is connected to the end of the transfer pipe 5. The vacuum pump 6 flashes the hot water supplied to the hot water storage tower 3 into steam and conveys it under vacuum. In such vacuum conveyance, a low degree of vacuum, which is slightly lower than atmospheric pressure, may be used instead of a high vacuum. In addition, hot water storage tower 3
A hot water level detector 8 for detecting the level of hot water (water level) and a drain valve 10 for taking out hot water and precipitated impurities from the bottom are provided.
The level controller 9 controls the opening and closing of the drain valve 10 according to the detection level of the hot water level detector 8. That is, the level controller 9 has an upper limit value and a lower limit value set as reference values of the control level, and opens the drain valve 10 to drain the hot water storage tower 3 on the condition that the detection level reaches the upper limit value. Discard the hot water and precipitated impurities from the bottom. In this case, if the internal pressure and hot water head pressure of the hot water storage tower 3 become greater than atmospheric pressure, the water is drained. Here, the hot water head pressure can be adjusted by adjusting the length from the bottom of the hot water storage tower 3 to the drain valve 10. In addition, even if the degree of vacuum is high and the water is not drained initially, air flows into the hot water storage tower 3 through the drain valve 10, and the degree of vacuum decreases and the hot water stored in the hot water storage tower 3 is removed. Impurities will gradually flow out. Note that if such drainage is not performed, the level of hot water will rise rapidly and block the conveyance port, making it impossible to remove impurities. In order to avoid such problems, drainage is required. Then, the drain valve 10 is closed on the condition that the detection level has reached the lower limit value. Alternatively, it is of course possible to set only the drain start value as the reference value and open the drain valve 10 for a certain period of time on the condition that the detection level reaches the drain start value, or to adopt other control methods. It is. The heating and cooling equipment 4 utilizes the energy released from the conveyor pipe during transportation for heating and cooling. Examples of heating and cooling equipment that uses steam as a heat source include, for example, double-effect absorption refrigerators and single-effect absorption refrigerators. Some use absorption refrigerators such as refrigerators.

Next, the operation of the illustrated system will be explained. When the hot water supply pump 2 is operated, hot water extracted from the production well 1 is supplied to the hot water storage tower 3. The inside of the hot water storage tower 3 is depressurized by the operation of the vacuum pump 6, so the supplied hot water flashes into steam and is automatically and smoothly transported through the transport pipe 5 in a form that does not contain impurities. be done. Thermal energy that leaks to the outside when steam is transported through the transport pipe 5 is utilized by the air conditioning equipment 4, and the steam transported to the hot water utilization equipment 7 is condensed and used as a hot spring. On the other hand, hot water storage tower 3
When the hot water level (water level) rises, the drain valve 10 is opened by the operation of the level controller 9, provided that the detection level of the hot water level detector 8 reaches a predetermined level (reference level). It will be done. As a result, the excess hot water accumulated in the hot water storage tower 3 and the impurities precipitated in the hot water are discarded. The impurities contained in the hot water left in the hot water storage tower 3 by flashing in this manner are disposed of through the drain valve 10 after a predetermined period of time.

In the system of the present invention, as described above, the vacuum pump is operated at the end of the transfer pipe to evacuate the inside of the transfer pipe and the hot water storage tower, thereby flushing the hot water and releasing the flashed steam. 90 to 95, as it is automatically transported depending on the form.
% of impurities can be removed by leaving them in the hot water, and since the only power required is to operate a vacuum pump, even low-temperature hot water of about 50 to 60°C can be removed by steam expansion of the hot water itself. It can be transported using 30% less power than when transporting.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, impurities in even low-temperature hot water can be almost completely removed, and the power for transportation can be significantly reduced. Therefore, there is no need to use any special equipment to remove impurities, and it is possible to easily supply hot water for hot springs that does not have an adverse effect on the human body.

[Brief explanation of drawings]

The figure is a diagram showing the configuration of an embodiment of a vacuum conveyance system for low-temperature hot water according to the present invention. 1... Production well, 2... Hot water supply pump, 3...
Hot water storage tower, 4...Air conditioning equipment, 5...Transport pipe, 6...Vacuum pump, 7...Hot water utilization equipment, 8
... Hot water level detector, 9 ... Level controller, 10 ... Drain valve.

Claims (1)

[Claims] 1. A vacuum conveyance system for low-temperature hot water that supplies low-temperature hot water to a hot water storage tower using a hot water supply pump and conveys the hot water from the hot water storage tower to a hot water utilization facility through a conveyance path. A vacuum pump that is connected to the terminal and creates a vacuum inside the conveyance path and the inside of the hot water storage tower, a level detection means that detects the level of hot water stored in the hot water storage tower, and a Equipped with a drain means for removing hot water and impurities stored in the water storage tower, and air conditioning equipment interposed in the conveyance path between the hot water storage tower and the vacuum pump,
The structure is such that a vacuum pump is used to evacuate the conveyance path and the hot water storage tower, and the hot water in the hot water storage tower supplied by the hot water supply pump is flashed to steam and is conveyed through the conveyance path under vacuum. A vacuum conveyance system for low-temperature hot water.