JPH062569A - Multipurpose cooling method for gas turbine generating equipment - Google Patents

Abstract

PURPOSE:To improve performance of a plant total unit by guiding an outlet heat medium water pipe of a carburetor, which vaporizes liquefied fuel gas, to a gas turbine lubricating oil cooler, so that accessories of a gas turbine generating equipment are reduced to decrease power consumption. CONSTITUTION:Seawater 1 is sucked up by a water pump 3, to first remove refuse by a strainer. The seawater pressurized by the water pump is guided by a water pump outlet pipe 4 and heat exchanged with liquefied fuel gas delivered from a liquefied fuel gas tank 5 in a carburetor 6, to decrease a temperature. Vaporized gas is fed to a gas turbine 11 and burned. A carburetor outlet seawater pipe 7 branches to advance into a gas turbine lubricating oil cooler 12, to here perform heat exchange with lubricating oil circulated in the gas turbine by a lubricating oil pump 13. The gas turbine 11 and a generator 21 are cooled by heat medium water of liquefied fuel gas. Thus by eliminating power consumption of the pump and a radiator fan, plant performance is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vaporizer for vaporizing a liquefied fuel gas and a liquefied fuel gas vaporization facility in which a heat medium water pipe pressurized by a pump passing through the vaporizer is connected. The present invention relates to a multi-purpose cooling method for gas turbine power generation equipment, which effectively utilizes latent heat of vaporization of liquefied fuel gas to reduce power consumption of a power plant.

[0002]

2. Description of the Related Art LNG and LPG are types of gas turbines that use liquefied fuel gas, both of which are vaporized by a vaporizer before entering a fuel nozzle. In equipment near the coast as this heating medium, seawater is sent to a vaporizer by a pump, and the seawater is cooled by heat exchange and discharged to the sea. River water and well water are often used in inland facilities, and the atmosphere is used as a heating medium in small-scale facilities, but all cold heat is wasted in the past.

On the other hand, the gas turbine power generation equipment has many elements that generate heat. In the gas turbine, the lubricating oil temperature rises due to the frictional heat of the bearings, and in the generator the temperature rise of the cooling air due to the heat generation of the coil, the same control is performed. The board also has heat in the electrical conductors due to electrical loss. In the room where the operator is, solar heat enters from the outside and the room temperature rises, and in the room where the gas turbine and the generator are installed, heat is dissipated from each equipment and the room temperature rises.
As for the cooling method of these devices and rooms, heat is exchanged with the atmosphere by a radiator fan, or a cooler is installed in the room or outside air is introduced into the room by a fan for ventilation.

The power source of each cooling fan and cooler described above is a part of the electric output of the generator driven by the gas turbine,
If the consumed auxiliary machinery power is large, the effective power consumption is reduced, so that the plant thermal efficiency is reduced.

An invention relating to the utilization of cold heat of the liquefied fuel gas is disclosed in JP-A-1-142219, which has a method of cooling the intake air of a gas turbine compressor. There is a drawback that the efficiency of the compressor is deteriorated due to loss and the cooling effect cannot be exhibited.

Japanese Patent Application Laid-Open No. 58-13342 discloses an invention for cooling lubricating oil of a gas turbine with fuel gas. However, since the specific heat of a gaseous fuel is small, the lubricating oil cannot be cooled satisfactorily, so that heat exchange with air occurs. It is necessary to use a radiator that allows the LNG to cool the lubricating oil, and the heating capacity is insufficient to completely evaporate the lubricating oil.

Further, as an invention for cooling a generator with LNG, there is Japanese Patent Laid-Open No. 63-131833. However, since the amount of heat is insufficient, another heating method has to be adopted.

[0008]

[Problems to be Solved by the Invention] LNG of liquefied fuel gas
Has a latent heat of vaporization of 127 kcal per kg, and a gas turbine with a unit output of 100,000 KW requires a heating amount of about 3.2 x 10 ⁶ kcal per hour. When this is heated with seawater or river water, the carburetor outlet will be 10 ° C below the inlet temperature.
Since it is too much reduced, it will adversely affect the fish and shellfish if it is discharged to the original sea or river, and it is necessary to process the heat water so that it can be used as heat carrier water and to waste the heated cooling water in vain. It is a loss.

As means for effectively using this cooling water,
Cooling the lubricating oil of the gas turbine and the cooling air of the generator only uses about half of the cooler. In addition to the above, as the heat source of the gas turbine power generation equipment, cooling is indispensable for cooling the room in which the control panel is installed indoors and for comfortably living in the operator's room. In addition, the gas turbine body and the generator body will be stored in a room so that the equipment and maintenance personnel will not be exposed to the weather during disassembly and inspection, and a crane will be installed on the ceiling. Since a large amount of heat is generated from the surface of the equipment when the equipment stored in this room operates, fans are installed at several places on the lower part of the wall and in the air intake holes and at some places on the ceiling roof to let outside air flow into the room. Then take measures to prevent a large temperature rise by ventilation. But,
In areas where the outside air temperature is high, the maximum outside air temperature is 55 ° C, so even if a large number of fans are installed, there will be a problem of around 70 ° C near the overhead crane. There are many heat generation sources in the power plant like this, and conventionally, each cooling means was adopted individually, but abundant latent heat of vaporization of liquefied fuel gas is transferred to the heat carrier water and supplied to the heat generation source. .

[0010]

When seawater is used as a heat medium to be sent to a vaporizer for vaporizing liquefied fuel gas, it is pressurized by a pump and sent through a vaporizer to heat-generating equipment and room cooling equipment. Design a seawater flow according to the size of. A thin pipe should be used to branch to the cooling equipment in the control room or operator's room, which generates a small amount of heat, and the orifice should be used to prevent unnecessary flow. Each room has a cooling device that exchanges heat between the seawater cooled by the vaporizer and the warm air in the room, and the seawater is heated. The pipe for sending seawater to the lubricating oil cooler and generator cooler of the gas turbine has a large amount of heat exchange, so it should be a thick pipe, and a flow control valve should be installed to flow an appropriate amount of seawater according to the amount of heat exchange. Thick piping that sends the remaining amount of seawater to the ventilation air intake heat exchanger in the final gas turbine and generator installation room may be used, and the room temperature can be adjusted by increasing or decreasing the number of operating fans that perform ventilation. .

Seawater which has passed through each of the air conditioners and coolers and has increased in temperature is collected in one pipe or drain and returned to the sea.

[0012]

[Function] Conventionally, when seawater or river water, which is a heat medium, returns water cooled by several degrees or more than the intake temperature in the vaporizer to the sea or river, it has a bad effect on living organisms. It was designed to send a temperature to the carburetor with a pump so that there is not much temperature difference, but by supplying the heat medium after cooling to the exothermic cooler of the gas turbine power generation equipment and heating it to reduce the temperature difference, the conventional temperature 2-3 times the difference will be acceptable. Therefore, the flow rate of the heat medium can be reduced to 1/2 to 1/3, and the number of pumps can also be reduced to 1/2 to 1/3. Next, by supplying the heat medium to the gas turbine lubricating oil cooler and the generator cooler, the equipment that conventionally supplied seawater or river water with a pump for each cooler of each device can be eliminated. Further, the cooling equipment in the control panel room and the operator's room used to produce cold heat with a chiller unit or the like, but it can be replaced by supplying a heat medium at the carburetor outlet. Ventilation air intake in the final gas turbine and generator installation room Cooling air that flows into the room by passing the heat medium through the heat exchanger and suppressing the temperature rise in the room, ventilation fans that were conventionally mounted on the ceiling The number of cars can be reduced.

[0013]

Embodiments of the present invention will be described in detail below with reference to FIGS. FIG. 1 shows the overall configuration according to the present invention. The underwater 1 is sucked up by the water pump 3, and the strainer 2 first removes dust. The seawater pressurized by the water pump is guided by the water pump outlet pipe 4, and the liquefied fuel gas discharged from the liquefied fuel gas tank 5 and the vaporizer 6
Heat is exchanged with and the temperature drops. The vaporized gas is sent to the gas turbine 11 and burned. The vaporizer outlet seawater pipe 7 branches to enter the gas turbine lubricating oil cooler 12, where the lubricating oil pump 13 exchanges heat with the lubricating oil circulating in the gas turbine. Since the temperature of the lubricating oil that exits the lubricating oil cooler needs to be maintained at a constant temperature, the cooling oil outlet lubricating oil pipe 14
A temperature detector 15 is provided in the temperature sensor, and the lubricating oil temperature control valve 16 controls the flow rate of seawater based on the detection. In this example, the generator cooler 22 is provided at the end of the vaporizer outlet seawater pipe, and here, the generator fan 23 exchanges heat with the cooling air circulating in the generator 21. Since it is necessary to keep the temperature of the cooling air that has exited the generator cooler constant, the cooler outlet cooling air pipe 24
A temperature detector 25 is provided in the air conditioner, and the flow rate of seawater is adjusted by the cooling air temperature adjusting valve 26 based on this detection. The gas turbine and generator are stored in the gas turbine and generator installation room 31,
A crane 81 is provided on the ceiling, but since ventilation is required, several ventilation fans 40 are installed on the ceiling of the room, and several ventilation air intake heat exchangers 32 are provided below the wall of the room. Connect the carburetor outlet seawater pipe. On the other hand, service building 51
Since a large number of control panels 53 for controlling the power plant are housed in the control panel room 52 on the first floor, heat generation due to electrical loss occurs. In the operator room 55 on the second floor, heat is generated from the monitoring board 56 and the water heater 57 of the plant, and solar heat also comes in through direct sunlight, the roof, and walls. A cooling heat exchanger 61 is attached to each of these chambers, and a vaporizer outlet seawater pipe is connected. Since the heat load of this cooling heat exchanger is smaller than the others, the seawater piping is made thin, but in order to distribute more accurately, the orifice diameter is determined by the maximum required seawater flow rate of each heat exchanger and the orifice 54 Attach. The seawater that has exited each cooler or heat exchanger in this way flows into the nearby drainage groove 60 and flows into the sea along with rainwater and the like.

Next, regarding the operation of the entire system, when starting all the equipment from a stopped state, one water pump is started because seawater for cooling the service building is required. Even if the gas turbine is in the preparatory operation for start-up, since the heat exchange amount of the gas turbine lubricating oil cooler is small, there is no problem even if there is no cold heat in the liquefied fuel gas. After a few minutes, the gas turbine consumes the liquefied fuel gas, so that cold heat is generated and the gas turbine, which has a large calorific value, generates combustion heat.
The water pumps are sequentially activated to gasify according to the flow rate of the liquefied fuel gas passing through the vaporizer, but the calorific value of each device is slightly delayed, so the water amount does not become insufficient. If the gas turbine suddenly stops the liquefied fuel gas for some reason, no cold heat will be obtained, but since the seawater is flowing, the room temperature will only rise temporarily and the equipment will not operate. Since it stops, the amount of heat decreases sharply and there is no problem.

FIG. 2 shows a sectional view of the cooling heat exchanger 61. The vaporizer outlet seawater pipe 7 is welded to the heat exchanger inlet water chamber 63 to guide the seawater 65, but the flow rate is limited by the orifice 54 sandwiched by the flange 62 immediately before entering the main water chamber. Seawater passes through the thin fin tubes 67 of about 10 in a divided manner, flows out into the heat exchanger outlet water chamber 64, and flows into the drain groove through the drain pipe 66. On the other hand, the room air 70 is sucked by the fan 69 driven by the electric motor 68 fixed to the housing 72 by the rod-shaped support 73. The room air is first cleaned of dust by the screen 71 attached to the top of the housing 72, and then sent to the fin tube to exchange heat with cold seawater, and then sent out from the lower part of the housing to the room. The room temperature can be adjusted by changing the rotation speed of the electric motor to increase or decrease the amount of air blown by the fan to lower or raise the room temperature. This cooling heat exchange is
It is preferable to make a hole at an intermediate high position on the wall of the service building 51 so that the indoor air can be circulated favorably.

FIG. 3 is a detailed view for cooling the gas turbine and the power generation installation room. The vaporizer outlet seawater pipe 7 is welded to the heat exchanger inlet water chamber 33 of the ventilation air intake heat exchanger 32 to guide the seawater 65 to the fin tubes 34. The fin tubes are made thin and provided, but the total cross-sectional area should be the same as or slightly larger than the cross-sectional area of the carburetor outlet seawater pipe, so that seawater can flow sufficiently. The seawater that has passed through the fin tube is collected in the heat exchanger outlet water chamber 35, and is discharged to the drain groove 60 by the drain pipe 66 welded to the main outlet water chamber. On the other hand, the outside air 37 flows into the ventilation air intake heat exchanger by rotating the ventilation fan 40 attached through the roof of the room and rotating the indoor air rising to the ceiling to the outside. A hood 36 is provided to remove rain, and the outside air is guided from below. In the tropical region, the outside air temperature may reach 55 ° C, but the temperature will drop below 40 ° C and enter the room by being cooled by cold seawater in the fin tube. If the gas turbine 11 and the generator 21 are combined in series, the lengthwise direction of the room will be about 50 M, so 4 to 6 ventilation air intake heat exchanges will be installed to determine an arrangement where the convection in the room will be uniform to some extent. . The ventilation air intake heat exchanger is attached to the lower part of the wall of the gas turbine / generator installation chamber 31 by making a hole, but it is effective to also attach it to the lower part of the opposite wall so as to sandwich the device. Although the crane 81 is provided near the ceiling of the room, the air temperature of 60 ° C. or lower can be maintained even when the equipment is operated, so that the electric motor 82 and the control equipment 83 are not adversely affected. The outside air heated in the room is exhausted to the outside by the fan, but the number of fans is decided by considering the heat value of the equipment and the heat quantity that the solar heat enters through the wall. If the ventilation air intake heat exchanger of the present invention is not installed, high-temperature outside air flows in as it is, so that the fan becomes large, the number of members increases, and the power consumption during operation increases.

FIG. 4 is an application example in which a closed circulation multi-purpose cooling water system is added to the entire configuration of FIG. 1, and the seawater that has passed through the carburetor is circulated while the carburetor outlet seawater pipe extends in the sea. It enters the cooler water heat exchanger 90 and exchanges heat with the circulating water. The temperature of the cooled circulating water is measured by the circulating water temperature detector 92 attached to the cooling water pipe 91 at the outlet of the heat exchanger, and if the temperature is too lower than the preset temperature, the circulating water return control valve 93 is set. Close the circulating water pump 94
The circulating water discharged in step 2 is made to flow to the circulating cooling water heat exchanger to raise the temperature. If the measured temperature is high, the circulating water return control valve is activated and the circulating water return pipe 95
The flow rate of circulating water through the circulating cooling water heat exchanger is reduced and the temperature is lowered. The circulating water cooled to a predetermined temperature by controlling the temperature is sent to each heat exchanger described in FIG. 1, and after heat exchange, the temperature rises and collects in the circulating water pump inlet pipe 96, and the pump strainer. Enter 97 and circulating water pump. Two pumps are installed to limit the flow rate in two stages. Since the flow rate is high, a pump strainer and a one-to-one combination are required. This application example is adopted particularly when there are many devices that do not like seawater.

[0018]

The effects of the present invention are listed below.

(1) Conventionally, the cooling of the gas turbine and the generator was independently performed by the radiator or seawater, but by using the heat medium water of the liquefied fuel gas, the equipment cost can be reduced. Moreover, the power consumption of the pump and the radiator fan is eliminated, so that the plant performance efficiency is improved.

(2) Since the chiller unit for cooling the control panel installation room and the operator's room is unnecessary, the equipment cost can be reduced.
In addition, the power consumed by the chiller unit is eliminated, so the plan performance efficiency is improved.

(3) Since the number of ventilation fans in the gas turbine and the generator installation room is reduced, power consumption is reduced and plant performance efficiency is improved.

[Brief description of drawings]

FIG. 1 is a system diagram of an embodiment of the present invention.

FIG. 2 is a sectional view of a cooling heat exchanger.

FIG. 3 is an explanatory view for cooling a gas turbine and a generator installation room.

FIG. 4 is a system diagram of another embodiment of the present invention.

[Explanation of symbols]

1 ... In the sea, 2 ... Strainer, 3 ... Water pump, 4 ... Water pump outlet pipe, 5 ... Liquefied fuel gas tank, 6 ... Vaporizer, 7 ...
Vaporizer outlet seawater pipe, 11 ... Gas turbine, 12 ... Gas turbine lubricating oil cooler, 13 ... Lubricating oil pump, 14 ... Cooler outlet lubricating oil pipe, 15 ... Temperature detector, 16 ... Lubricating oil temperature control valve, 21 … Generator, 22… Generator cooler, 23
… Generator fan, 24… Cooler outlet cooling air piping, 25
... Temperature detector, 26 ... Cooling air temperature control valve, 31 ... Gas turbine and generator installation room, 32 ... Ventilation air intake heat exchanger, 51 ... Service building, 52 ... Control panel room, 53 ... Control panel, 54 ... Orifice, 55 ... Operator's room, 56 ... Monitoring panel, 57 ... Water heater, 60 ... Drain, 61 ... Cooling heat exchanger.

Claims (5)

[Claims] 1. A liquefied fuel gas vaporization facility in which a vaporizer for vaporizing a liquefied fuel gas and a pipe for a heat medium water pressurized by a pump passing through the vaporizer are connected to each other, and an outlet heat medium water for the vaporizer is provided. A multipurpose cooling method for a gas turbine power generation facility, characterized in that the pipe is led to a gas turbine lubricating oil cooler. 2. A multipurpose cooling method for a gas turbine power generation facility, which introduces the outlet heat medium water pipe of the vaporizer according to claim 1 to a generator cooler. 3. A multipurpose cooling method for a gas turbine power generation facility, wherein the outlet heat medium water pipe of the vaporizer according to claim 1 is introduced to a cooling heat exchanger in a control panel room. 4. A multi-purpose cooling method for gas turbine power generation equipment, wherein said outlet heat medium water pipe of said vaporizer according to claim 1 is led to a cooling heat exchanger in an operator's room. 5. A multi-purpose cooling method for gas turbine power generation equipment, wherein said outlet heat medium water piping of the vaporizer according to claim 1 is introduced to a ventilation air intake heat exchanger of a gas turbine and a generator equipment room.