JPH09178371A - Heat exchange system using seawater or river water - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a heat exchange system that uses seawater, which has low power costs, equipment costs, and management costs and is highly earthquake resistant. SOLUTION: A sea water channel 11 is constructed in a sea surface 10, a heat exchanger 15 is arranged in this sea water channel 11, and a sea current is created in the sea water channel 11 by a pump 16, whereby a heat exchanger 1 is formed.
Heat exchange is performed between the fluid in 5 and seawater. Further, when the operation is stopped, the gates 13 and 14 are closed, seawater is pumped up from this section by the drainage pump 17 and returned to the sea, the seawater channel 11 is emptied, and the supply of the fluid to the heat exchanger is stopped. To do.
Alternatively, the heat exchanger 43 is immersed in the water flow of the river 40, and heat exchange is performed using the natural water flow of the river 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchange system that uses seawater or river water as a heat source to vaporize LNG or the like, which is a low-temperature fluid, or exchange heat with other fluids.

[0002]

2. Description of the Related Art In the case of an LNG vaporizer using seawater as a heat source, the vaporizer is generally installed on land. For this reason, the sea water is pumped up to the land by using a pumping pump, and the pumped sea water is further guided to the top of the vaporizer and sprinkled from there. FIG. 8 shows an example of this LNG vaporizer, in which the LNG vaporizer 1 is installed on land, and seawater pumped from the sea surface 2 by the pump 3 is fed from the seawater pipe 4 to the top of the heat exchanger 1. It is a heat exchange system in which the water is guided, sprinkled from here by the sprinkler 5, and the drainage is returned to the sea via the drainage channel 6.

[0003]

However, the above heat exchange system has the following drawbacks. a. The seawater pump 3 consumes energy required for the velocity head required for seawater circulation and the position head required for the head h between the sea surface 2 and the heat exchanger 1, but heat is required for heat exchange. Only the velocity head portion necessary for circulation is not necessarily the position head portion. b. In order to ensure uniform watering (water curtain) for the heat exchanger 1, a large amount of circulating seawater is set, and energy is wasted accordingly. c. Since equipment for uniformly sprinkling water on the heat exchanger 1 and its management are required, extra equipment costs, personnel costs, and the like are required. d. Since heat exchangers and water sprinklers for seawater are built on land, they are tall and expensive for earthquake countermeasures.

[0004]

Means for Solving the Problems The present invention provides the above a to d.
The purpose is to solve the problem described in 1., and its configuration is as follows. 1. A sea channel for heat exchange is constructed by partitioning the sea surface, and an upstream side gate and a downstream side gate are provided in this sea channel, between the upstream side gate and the downstream side gate, and in the seawater inside the sea channel. Arrange the heat exchanger to be immersed,
A sea current generating device for generating a sea current is provided in the sea water channel, a drainage pump for pumping sea water from the sea water channel between the upstream gate and the downstream gate and returning it to the sea is provided, and when heat exchange is performed. When the upstream gate and the downstream gate are opened and the sea current generator is driven to create a seawater flow in the seawater channel, heat exchange is performed between the seawater and the fluid in the heat exchanger, or when heat exchange is stopped. The upstream side gate and the downstream side gate are closed to block the seawater channel, and the section is emptied by draining seawater to the sea side using the drainage pump from the blocked section. A heat exchange system using seawater, characterized in that the supply of fluid to the heat exchanger is stopped.

[0005] 2. When the guide cylinder is immersed in water, a heat exchanger is inserted into the guide cylinder, the downstream side of the guide cylinder is squeezed to incorporate the water flow generator therein, and when heat exchange is performed, the water flow generator is used. To generate a water flow in the guide cylinder, heat exchange between this water flow and the fluid in the heat exchanger, and when the heat exchange is stopped, the drive of the water flow generator is stopped, and A heat exchange system using seawater or river water, characterized in that the supply of fluid to the water is stopped.

[0006] 3. When immersing the heat exchanger in water, arranging a water flow generator near the heat exchanger, or when performing heat exchange, drive the water flow generator to create a water flow through the heat exchanger, When the water flow is exchanged with the fluid in the heat exchanger, or when the heat exchange is stopped, the drive of the water flow generation device is stopped and the supply of the fluid to the heat exchanger is stopped. A heat exchange system that uses seawater or river water.

In each of the above structures, the water flow can be generated by a pump or a fan, a jet jet, a water wheel, or the like.

4. When a water flow of a river is divided by a partition wall to form a heat exchange area with a water gate, a heat exchanger is immersed in water in the heat exchange area, and when heat exchange is performed, the water gate is opened to perform heat exchange. Flow the river water in the area, heat exchange between this river water and the fluid in the heat exchanger, when stopping the heat exchange, close the floodgate to eliminate the water flow in the heat exchange area, and A heat exchange system using river water, characterized in that the supply of fluid to the heat exchanger is stopped.

[0009] 5. When a heat exchanger is immersed in the water flow of a river and a floodgate is constructed on the upstream side of this heat exchanger. When heat exchange is performed, the floodgate is opened to allow the river water to flow, and heat exchange with this river water is performed. Utilizing river water, characterized in that when exchanging heat with the fluid in the vessel, or when stopping the heat exchange, the water gate is closed to stop the water flow and the supply of fluid to the heat exchanger is stopped. Heat exchange system.

[0010]

1 and 2 show an embodiment of the invention described in claim 1. 10 is the sea level, 11 is the sea level 10
Is formed in the sea surface 10 by partition walls 12 and 12a, 13 is an upstream gate provided upstream of the sea passage 11, 14 is a downstream gate provided downstream, 15
Is a heat exchanger, 16 is a heat exchanger 15 in the sea channel 11.
Is a fan installed on the upstream side of, and forcibly generates the ocean current flowing from the upstream side to the downstream side in the seawater channel 11. Reference numeral 17 denotes a drainage pump for pumping seawater from this section and returning it to the sea when the upstream and downstream gates 13 and 14 are closed to empty the section (seawater channel 11).

In the above heat exchange system, the gate 1
3 and 14 are opened to introduce seawater into the seawater passage 11, the fan 16 is driven to create an ocean current in the seawater passage 11, and LNG is supplied into the heat exchanger 15, and the LNG is generated by the heat of the seawater. Evaporates when heated. When the operation is stopped, the gates 13 and 14 are closed and the drain pump 17
Is driven to discharge the seawater from the inside of the seawater passage 11 between the gates 13 and 14 to the sea side, and the supply of LNG to the heat exchanger 15 is stopped. This situation is shown in FIG.

FIG. 4 shows an embodiment of the invention described in claim 2. Reference numeral 20 is water such as seawater or lake, 21 is a guide cylinder immersed in the water 20, and 22 is a heat exchanger in the guide cylinder 21. Reference numeral 24 designates the throttle portion 2 by narrowing down the downstream side of the guide cylinder 21.
3 is a fan as a water flow generator incorporated therein. In the above embodiment, when heat exchange is performed, the fan 24 is driven to create a water flow in the guide cylinder 21, and the water flow and the fluid in the heat exchanger 22 are heat-exchanged. When the heat exchange is stopped, the driving of the fan 24 is stopped and the supply of the fluid into the heat exchanger 22 is stopped.

FIG. 5 shows an embodiment of the invention described in claim 3. Reference numeral 30 is water such as the sea or lake, 31 is a heat exchanger immersed in the water 30, and 32 is a distributed fan as a water flow generator installed near the heat exchanger 31. When heat exchange is performed in the above-described embodiment, the fan 32 is driven to create a water flow passing through the heat exchanger 31, and the water flow and the fluid in the heat exchanger 31 are heat-exchanged. When the heat exchange is stopped, the drive of the fan 32 is stopped and
The supply of fluid to the heat exchanger 31 is stopped.

FIG. 6 shows an embodiment of the invention according to claim 4 which utilizes the natural flow of a river. Reference numeral 40 is a river, 41 is a partition wall that partitions the water flow of the river 40 to form a heat exchange region 44, 42 is a floodgate, and 43 is a heat exchanger incorporated in the heat exchange region 44. When heat exchange is performed in the above-described embodiment, the water gate 42 is opened to allow the river water to flow into the heat exchange area 44, and the river water and the fluid in the heat exchanger 43 are heat-exchanged. When the heat exchange is stopped, the water gate 42
Is closed to eliminate the water flow to the heat exchange area 44,
The supply of fluid to the heat exchanger 43 is stopped.

FIG. 7 shows an embodiment of the invention described in claim 5. Reference numeral 50 is a river, 51 is a heat exchanger immersed in the water flow of the river 50, and 52 is a floodgate installed on the upstream side of the heat exchanger 51. In the above embodiment, when heat exchange is performed, the water gate 52 is opened to allow river water to flow, and the river water and the fluid in the heat exchanger 51 are heat-exchanged. When the heat exchange is stopped, the water gate 52 is closed to eliminate the water flow, and the supply of the fluid to the heat exchanger 51 is stopped.

[0016]

As described above, the present invention has the following effects by constructing a heat exchange device in seawater, river water, or lake water. a. In the case of using seawater, the energy consumed when using the heat exchanger is only the energy required for seawater circulation, and the energy for the conventional head position is saved. The calculation formulas of the pump power in the case of the present invention and the pump power in the case of the conventional example are compared as follows. (The following margin) The present invention

[Equation 1] Conventional example

[Equation 2] b. When the natural water stream of the river is used, the pump power shown in a above becomes unnecessary. c. It is possible to reduce the excessive circulation amount that was necessary to avoid running out of water. d. Eliminates the controls and equipment adjustments required to avoid running out of water. e. Since the height of the heat exchanger is low, the bridge groove can be made low and the earthquake resistance can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a heat exchange system according to the present invention.

FIG. 2 is a plan view of a heat exchange system according to the present invention.

FIG. 3 is an explanatory diagram when the operation is stopped when the gate is closed and seawater is drained from the seawater channel.

FIG. 4 is an explanatory view of a heat exchange system using a guide tube.

FIG. 5 is an explanatory diagram of a heat exchange system using a distributed fan.

FIG. 6 is an explanatory diagram of a heat exchange system using river water.

FIG. 7 is an explanatory diagram of a heat exchange system using river water.

FIG. 8 is an explanatory diagram of a conventional LNG vaporizer.

[Explanation of symbols]

 10 Sea Surface 11 Sea Waterway 12, 12a Partition Wall 13 Upstream Gate 14 Downstream Gate 15 Heat Exchanger 16 Fan 17 Drain Pump 20 Seawater 21 Guide Tube 22 Heat Exchanger 23 Throttling Part 24 Fan 30 Seawater 31 Heat Exchanger 32 Dispersion Type Fan 40 River 41 Partition wall 42 Floodgate 43 Heat exchanger 44 Heat exchange area 50 River 51 Heat exchanger 52 Floodgate

Claims (5)

[Claims] 1. A sea canal for heat exchange is constructed by partitioning the sea surface, and an upstream gate and a downstream gate are provided in this sea canal. The sea canal is between the upstream gate and the downstream gate. A heat exchanger is arranged so as to be immersed in the seawater inside, a sea current generator for generating a sea current is provided in the sea water channel, and sea water is pumped up from the sea water channel between the upstream gate and the downstream gate. When heat exchange is performed by installing a drainage pump that returns the seawater to the sea, open the upstream gate and the downstream gate and drive the ocean current generator to create a seawater flow in the seawater channel. When exchanging heat in the fluid in the exchanger, or when stopping the heat exchange, the upstream side gate and the downstream side gate are closed to shut off the seawater channel, and seawater is drained from within this blocked section using the drainage pump. Section by draining to the sea side With emptied, to stop the supply of fluid to the heat exchanger, the heat exchanger system that utilizes seawater, characterized in that. 2. When the guide tube is immersed in water and a heat exchanger is inserted into the guide tube, the downstream side of the guide tube is squeezed to incorporate a water flow generator therein, and heat exchange is performed. , Driving the water flow generating device to create a water flow in the guide cylinder, and exchanging heat between the water flow and the fluid in the heat exchanger. When stopping the heat exchange, the driving of the water flow generating device is stopped. A heat exchange system using seawater or river water, characterized in that the supply of fluid into the heat exchanger is stopped. 3. A heat exchanger is immersed in water, a water flow generator is arranged in the vicinity of the heat exchanger, and when heat exchange is performed, the water flow generator is driven to pass through the heat exchanger. Creating a water flow, exchanging the water flow and the fluid in the heat exchanger, when stopping the heat exchange, while stopping the drive of the water flow generator, stop the supply of the fluid to the heat exchanger, A heat exchange system using seawater or river water characterized by the following. 4. The water flow of a river is divided by a partition wall to form a heat exchange area with a water gate, the heat exchanger is immersed in water in the heat exchange area, and the heat gate is used when heat exchange is performed. Open to allow the river water to flow into the heat exchange area, and heat exchange between this river water and the fluid in the heat exchanger.When stopping the heat exchange, close the floodgate to remove the water flow in the heat exchange area. A heat exchange system using river water, characterized in that the supply of fluid to the heat exchanger is stopped at the same time as disappearing. 5. A heat exchanger is immersed in a water stream of a river, and a water gate is constructed on the upstream side of this heat exchanger. When heat exchange is performed, the water gate is opened to allow river water to flow. Heat exchange between the river water and the fluid in the heat exchanger, and when the heat exchange is stopped, the water gate is closed to stop the water flow, and the supply of the fluid to the heat exchanger is stopped. A heat exchange system that uses river water.