CN1150995A - Liquefied natural gas gasification device for gas turbine compound circulating power plant - Google Patents

Abstract

The invention provides a LPG gasifier which can generate desired amount of natural gas quickly in a gas turbine composite power plant, which is highly safe and economic. In the gasifier, a suction cooler (20) is used to cool the suction air of the gas turbine, the cooling water that has absorbed heat is used as the heat source water, and LPG is gasified by a heating medium evaporator (1), LPG gasifiers (3), (4), a heating medium evaporator (12) and a LPG gasifier (11) via a nonflammable heating medium A. In addition, the cooling water that has cooled the machines in the power plant is introduced into heating medium evaporators (12) (1) as the heat source water.

Description

The liquefied natural gas gasifying device of gas turbine combined cycle power stations

The present invention relates to the liquefied natural gas gasifying device of the gas turbine combined cycle power stations of gas-firing, especially relate to the heat that obtains of the machinery equipment of same power station of hot and cold that the suction air that utilizes the cooling power plant gas turbine obtains, the LNG Liquefied natural gas of gasifying electricity generation factory aequum, utilize the suction air of the cold and hot cooling gas turbine of LNG Liquefied natural gas simultaneously, improve the device of the output of gas turbine

With the LNG Liquefied natural gas is the power station of fuel, for the consideration of effective use of energy sources aspect, in recent years, the gas turbine combined cycle power stations of gas turbine and steam turbine and usefulness has been become main flow.

But, the gas turbine combined cycle power plant has the intake air flow of gas turbine certain because of volume flow, if atmospheric temperature uprises, the MAF that is attracted just diminishes, the output of gas turbine just reduces this characteristic, exists in the generating capacity in summer that power consumption uprises and reduces this problem.

In order to improve this problem, studied the suction air that utilizes LNG Liquefied natural gas cooling gas turbine, utilize the cooling to suck the means of the resulting hot gas LNG Liquefied natural gas of air simultaneously, proposed as shown in Figure 3, be shown in the spy and open means on the flat 1-142219 communique.

The main points of these motion means are: as shown in Figure 3, between the air-breathing cooling unit (8) of the vaporizer (3) of LNG Liquefied natural gas and gas turbine, thermal accumulator (4) is set, the circulatory system of the 1st hot media is set between liquefied natural gas gasifying device (3) and thermal accumulator (4), the circulatory system of the 2nd hot media is set between thermal accumulator (4) and air-breathing cooling unit (8) simultaneously, carry out the gasification of LNG Liquefied natural gas and be in the cooling of the heat-accumulating agent (4a) in the thermal accumulator by the circulatory system of the 1st hot media, by the suction air of the circulatory system cooling gas turbine of the 2nd hot media.

The shortcoming of these existing means is: the gasification thermal source of LNG Liquefied natural gas only relies on the resulting heat of suction air of cooling gas turbine, because the temperature of the generating capacity of gasification rock gas and gasification rock gas is controlled by atmospheric conditions not only, and wait in the winter time and there is no need to carry out under the situation that cooling gas turbine sucks air, the gasification thermal source that has not just had LNG Liquefied natural gas is so need be the new liquefied natural gas gasifying device of thermal source with seawater etc. just.

As the liquefied natural gas gasifying device that thermal source uses, there is following shortcoming in seawater as we all know like that.

(1) because of the gasification thermal source of a large amount of seawater of needs as LNG Liquefied natural gas, thus just need be based on the jumbo sea water supply equipment of sea water pump and intake equipment, and the composition of liquefied natural gas gasifying equipment is just complicated.

(2) the problems such as corrosion with material of adhering to of sea hydrobiont appear in the water portion that touches of sea water supply equipment easily, and this is to make maintenance miscellaneousization of operation of liquefied natural gas gasifying equipment and a long-term reason.

(3) the used seawater of gasification thermal source as LNG Liquefied natural gas discharges in the ocean, because temperature is low, what also bring some influences to marine ecosystems, make it become a restrictive condition of liquefied natural gas gasifying equipment addressing aspect.

In addition, seawater or warm water are being used for heat source fluid, the existing apparatus aspect of gasification, heating LNG Liquefied natural gas, proposed as shown in Figure 4, by spy public clear 61-24634 communique disclosed device.

The main points of this motion are a kind of like this devices: as shown in Figure 4, in the interior intermediate heat medium formula indirect heat exchanger 1 that intermediate heat medium 1a is housed, intermediate heat medium 1a is by heat source fluid heating, the evaporation of flowing out the tube bundle that supplies to from conduit 4 in this heat exchanger 1, from conduit 5, supplies to LNG Liquefied natural gas the tube bundle 7 that is contained in the heat exchanger 1 by this vaporized intermediate heat medium steam heated from conduit 6.The steam of intermediate heat medium since with the heat exchange of LNG Liquefied natural gas, condensation liquefaction drops to the liquid phase portion of below, once more evaporation repeatedly.The LNG Liquefied natural gas that was heated in heat exchanger 1 supplies to multi tube heat exchanger 2 by conduit 8, in this heat exchanger 2, heat once more by the heat source fluid of supplying with from conduit 3, after being heated to the temperature that is suitable for using, discharge from conduit 9 with the form of gasification rock gas.

The device of this existing mode has following 2 shortcomings.

(1) adopt in multi tube heat exchanger (2), LNG Liquefied natural gas and heat source fluid are not by the intermediate heat medium, but the mode of direct heat exchange, the possibility that flammable LNG Liquefied natural gas leaks in the heat source fluid pipeline is bigger.Therefore, the operation pressure of the LNG Liquefied natural gas in this liquefied natural gas gasifying device generally is 20-50kg/cm ², opposite with it, the operation pressure of heat source fluid is low to 10kg/cm ²Below, even in heat exchanger 2, occur under the situation of little defectives such as pin hole.A large amount of LNG Liquefied natural gas also can leak in the heat source fluid pipeline.Especially using under the situation of warm water as heat source fluid of power station, when LNG Liquefied natural gas leaks in this warm water pipeline, inflammable gas will be diffused in the power station, and the safety of power station becomes problem.

(2) make LNG Liquefied natural gas and near the temperature 0 ℃ replace heat exchange with regard to the heat source fluid that freezes, the possibility that heat source fluid freezes in heat exchanger 2 exists all the time.Occur in heat exchanger 2 under 3 situations of freezing, ice-melt needs the long time, and the gasification operation of ice-melt operation period LNG Liquefied natural gas must stop.Ice though be less than icing degree in addition but generate, the abrasion that the borneol that comes off produces will damage heat exchanger 2, and the possibility that LNG Liquefied natural gas leaks in the heat source fluid pipeline will increase.In this existing mode, even design heat exchanger 1 is in the hope of being heated to LNG Liquefied natural gas the temperature that does not generate ice in heat exchanger 2, when the situations such as flow change of load change that LNG Liquefied natural gas occurred or heat source fluid, still there is the possibility of freezing.Multi tube heat exchanger particularly, bias current takes place in fluid easily that flow in tube bundle, and the pipeline that flow rate of fluid is slow generates ice easily.

Purpose of the present invention be exactly to provide a kind of at least can be according to the needs of same power station, often the liquefied rock gas of the gas turbine combined cycle power stations of gasification combustion rock gas, and utilize the cold and hot suction air that carries out cooling gas turbine of this LNG Liquefied natural gas, the generating capacity that can prevent power station in season such as summer reduces, and Security and all superior liquefied natural gas gasifying device of Economy.Must solve following problem for reaching this purpose.

1. guaranteeing the secure context of power station, take not make inflammable gas to leak into countermeasure outside the system and that and make a spot of leakage also can detected easily method.

2. want to utilize the suction air of the cold and hot cooling gas turbine of LNG Liquefied natural gas, and can utilize the suction air of cooling gas turbine and the hotwork that obtains is the gasification thermal source of LNG Liquefied natural gas.

3. the cheap thermal source of needed heat in the time of will preparing under all running statees of power generating equipment, can both to provide full dose gasifying electricity generation factory necessary LNG Liquefied natural gas, and the supplemental heat source that this thermal source will can be used as the resulting heat of suction air of cooling gas turbine is all the time used.

4. want to reduce new thermals source such as the power that is used for the running of LNG Liquefied natural gas device of air and water vapor.

5. to possess in the summer of the air-breathing cooling of carrying out gas turbine, improve the function of the air-breathing cooling effect of gas turbine along with the rising of atmospheric temperature.

6. want to get rid of the icing principal element that waits the normal operation that hinders liquefied natural gas gasifying equipment of heat source fluid

7. wanting can be along with the change of power generating equipment load, the full dose of the LNG Liquefied natural gas of gasifiable necessity.

8. gasify the temperature of rock gas for guaranteeing the safety of power generating equipment, be more than 0 ℃.

Inventors of the present invention, as the means that solve above-mentioned problem, the liquefied natural gas gasifying device of the gas turbine combined cycle power stations of the gas-firing shown in (1) to (6) below having proposed.

(1) a kind of liquefied natural gas gasifying device of gas turbine combined cycle power stations of gas-firing, it is characterized in that: it is by constituting with the bottom, promptly provide the rock gas that gasified fuel by heating agent steam heated LNG Liquefied natural gas as gas turbine across metallic walls

The liquefied natural gas gasifying device of this heating agent steam of condensation simultaneously; The water heating makes its evaporation at the above-mentioned heating agent liquid of this liquefied natural gas gasifying device condensation, produces above-mentioned heating agent steam, cools off the heating agent vaporizer of above-mentioned water simultaneously; By the above-mentioned water cooling of crossing in this heating agent evaporator cools after the suction air of gas turbine of gas turbine combined cycle power stations of gas-firing, water is returned to the air-breathing cooler of above-mentioned heating agent vaporizer; Cool off the machine cooler of above-mentioned power station machinery equipment; And can be in the water that will be sent to above-mentioned heating agent vaporizer with the heat supply of the above-mentioned machine that obtains at this machine cooler.

(2) a kind of liquefied natural gas gasifying device of gas turbine combined cycle power stations of gas-firing, it is characterized in that it is by constituting with the bottom: by heating agent steam heated LNG Liquefied natural gas, make the liquefied natural gas gasifying device of this heating agent vapour condensation simultaneously across metallic walls; The water heating makes its evaporation at the above-mentioned heating agent liquid of this liquefied natural gas gasifying device condensation, produces above-mentioned heating agent steam, simultaneously with above-mentioned water-cooled heating agent vaporizer; Air-breathing cooler by the suction air of the gas turbine of the gas turbine combined cycle power stations of the above-mentioned water cooling gas-firing of crossing in this heating agent evaporator cools; Make cooling water cooler in the factory of water of machine cooling of above-mentioned power station by natural cold and heat sources such as seawater coolings; To in this factory, make in the cooling water cooler and cool off the pipeline that the cooling water circulating pump water outlet is communicated with the water inlet of cooling water cooler in the above-mentioned factory in the above-mentioned power station machine water-cooled factory afterwards; Cool ice cooler in the above-mentioned factory of bypass, the pipeline that the water outlet of cooling water circulating pump in the above-mentioned factory is communicated with the machine of above-mentioned power station; The pipeline that the water outlet of above-mentioned air-breathing cooler is communicated with the water inlet of above-mentioned heating agent vaporizer; The pipeline that the water outlet of cooling water circulating pump in the above-mentioned factory is communicated with the water inlet of above-mentioned heating agent vaporizer; With the water outlet of above-mentioned heating agent vaporizer and the water inlet connecting pipeline of above-mentioned air-breathing cooler; With the water outlet of the water outlet of above-mentioned heating agent vaporizer and above-mentioned air-breathing cooler at least any one with above-mentioned factory in the water inlet of cooling water cooler and any one pipeline that is communicated with at least of water outlet.

(3) the liquefied natural gas gasifying device of the gas turbine combined cycle power stations of above-mentioned (1) or (2) described gas-firing, it is characterized in that: above-mentioned heating agent is 1,2,2,2-HFC-134a (HFC-134a).

(4) the liquefied natural gas gasifying device of the gas turbine combined cycle power stations of above-mentioned (2) or above-mentioned (3) described gas-firing is characterized in that it is by constituting with the bottom: cooling water temperature is regulated and is used flow control valve in the factory that is provided with in any at least pipeline of cooling water cooler in pipeline that the water outlet of cooling water circulating pump is communicated with the water inlet of cooling water cooler in the above-mentioned factory in above-mentioned factory and the above-mentioned factory of bypass, pipeline that the water outlet of cooling water circulating pump in the above-mentioned factory is communicated with above-mentioned power station machine; Detect the temperatuer detector of the temperature of the water that cools off above-mentioned power station machine; Regulate the means of the aperture of cooling water temperature adjusting usefulness flow control valve in the above-mentioned factory according to the checkout value of this temperatuer detector.

(5) the liquefied natural gas gasifying device of the gas turbine combined cycle power stations of above-mentioned (2), above-mentioned (3) or above-mentioned (4) described gas-firing is characterized in that it is by constituting with the bottom: at pipeline that the water outlet with above-mentioned air-breathing cooler is communicated with the water inlet of above-mentioned heating agent vaporizer and the heating agent vaporizer that is provided with in any at least pipeline of the pipeline that the water outlet of cooling water circulating pump is communicated with the water inlet of above-mentioned heating agent vaporizer in above-mentioned factory supply with coolant-temperature gage and regulate and use flow control valve; Detection supplies to the temperatuer detector of temperature of the water of above-mentioned heating agent vaporizer; Regulate above-mentioned heating agent vaporizer according to the checkout value of this temperatuer detector and supply with the means that coolant-temperature gage is regulated the aperture of using flow control valve.

(6) the liquefied natural gas gasifying device of the gas turbine combined cycle power stations of above-mentioned (2), above-mentioned (3), above-mentioned (4) or above-mentioned (5) described gas-firing is characterized in that it is by constituting with the bottom: being accommodated in top has gas phase heating agent, bottom to state the 1st heating agent vaporizer in the liquid phase portion on having in the 1st heating agent evaporator shell of liquid phase heating agent; Be accommodated in be provided with the position than above-mentioned the 1st heating agent vaporizer the position height is set, top is used with the pipeline that is communicated with of gas phase heating agent in above-mentioned the 1st heating agent evaporator shell is connected and the 1st liquefied natural gas gasifying device and the 2nd liquefied natural gas gasifying device in the bottom is used with the pipeline of liquid phase heating agent connection in above-mentioned the 1st heating agent evaporator shell is connected the housing; The 3rd liquefied natural gas gasifying device in the gas phase heating agent portion on being accommodated in the housing of having enclosed heating agent; The 2nd heating agent vaporizer in the liquid phase heating agent portion under being accommodated in the housing of having enclosed above-mentioned heating agent; The LNG Liquefied natural gas of above-mentioned the 1st liquefied natural gas gasifying device is exported the pipeline that is communicated with the LNG Liquefied natural gas inlet of above-mentioned the 2nd liquefied natural gas gasifying device; The LNG Liquefied natural gas of above-mentioned the 2nd LNG Liquefied natural gas gas device is exported the pipeline that is communicated with the LNG Liquefied natural gas inlet of above-mentioned the 3rd liquefied natural gas gasifying device; The pipeline that the water outlet of cooling water circulating pump in the water outlet of the water inlet of above-mentioned the 2nd heating agent vaporizer and above-mentioned air-breathing cooler and the above-mentioned factory is communicated with; The pipeline that the water outlet of above-mentioned the 2nd heating agent vaporizer is communicated with the water inlet of above-mentioned the 1st heating agent vaporizer; The pipeline that the water outlet of above-mentioned the 1st heating agent vaporizer is communicated with the water inlet of above-mentioned air-breathing cooler.

(7) the liquefied natural gas gasifying device of the gas turbine combined cycle power stations of above-mentioned (6) described gas-firing, it is characterized in that: this gasification installation comprises water output control device and LNG Liquefied natural gas delivery volume control device, wherein, the component part of this water output control device has the pressure that detects in above-mentioned the 1st heating agent vaporizer, the Pressure testing accommodometer of output control signal, import the signal that requires of the output signal of same Pressure testing accommodometer and water output, with the water flow signal selector of a wherein less arbitrarily signal as the setting signal output of water output, detection supplies to the water flow detector of flow of the water of above-mentioned the 1st heating agent vaporizer, import the output signal of the testing signal and the above-mentioned water flow signal selector of same water flow detector, the water flow accommodometer of output water flow control signal, and control by the output signal of same water flow accommodometer, feed to the water output control valve of above-mentioned the 1st heating agent vaporizer; The component part of LNG Liquefied natural gas delivery volume control device has the pressure that detects in above-mentioned the 1st heating agent vaporizer, the Pressure testing accommodometer of output control signal, import the signal that requires of the output signal of same Pressure testing accommodometer and LNG Liquefied natural gas delivery volume, with the LNG Liquefied natural gas flow signal selector of a wherein less arbitrarily signal as the setting signal output of LNG Liquefied natural gas delivery volume, detection supplies to the LNG Liquefied natural gas flow detector of the LNG Liquefied natural gas flow of above-mentioned the 1st liquefied natural gas gasifying device, import the output signal of the testing signal and the above-mentioned LNG Liquefied natural gas flow signal selector of same LNG Liquefied natural gas flow detector, the LNG Liquefied natural gas flow accommodometer of output LNG Liquefied natural gas flow control signal, and the LNG Liquefied natural gas inlet that is arranged at above-mentioned the 1st liquefied natural gas gasifying device, the LNG Liquefied natural gas flow control valve of the output signal control of the above-mentioned LNG Liquefied natural gas flow accommodometer of foundation.

1) in above-mentioned solution (1) or (2), because by come to make its gasification, so LNG Liquefied natural gas can not leak in the circulatory system of water across the heating of metallic walls water, vaporized heating agent across metallic walls heating LNG Liquefied natural gas.Even,, can detect with the flow process instrument at an easy rate so this is let out because LNG Liquefied natural gas leaks in the heating agent just in case defectives such as pin hole on the metallic walls that separates heating agent and LNG Liquefied natural gas, occurred.

In addition, because come the suction air of cooling gas turbine, even can prevent also that in the higher occasion of atmospheric temperature the output of gas turbine from reducing by the water that cooled off by heating agent with LNG Liquefied natural gas.And because the above-mentioned water of being crossed by the suction air heating of gas turbine is used for the heating of heating agent, so the resulting heat of suction air of cooling gas turbine is used for the heating and the gasification of LNG Liquefied natural gas indirectly.

Further, cooled off the warm water after the machine of power station, and not only can be used for the heating of above-mentioned heating agent but also can utilize the generation heat of power station machine as required as best one can.This just means that the thermal source that in the past was rejected can be used as the heating of LNG Liquefied natural gas, gasification thermal source as required as best one can.

And, under the less situation of the generation heat of power station machine, supply to the water inlet that is used to cool off cooling water cooler in the factory of water (cooling water in the factory) of uniform machinery with cooled with seawater because of the above-mentioned water that the rock gas that is liquefied can be cooled off, it can be heated by seawater, for example under the less situation of the generation heat of the machine of power station, the heat that seawater had can be used as heating, the gasification thermal source of LNG Liquefied natural gas, can guarantee the heating and gasifying thermal source of the necessary LNG Liquefied natural gas in power station under all running statees of power generating equipment.

In addition, under the more situation of the generation heat of power station machine, because the temperature that the rock gas that is liquefied cooled off can be supplied to the water outlet of cooling water cooler in the above-mentioned factory by low above-mentioned water, so can reduce the power that sea water supply is arrived the pump of cooling water cooler in the above-mentioned factory.

2) in above-mentioned solution (3), because do heating agent, so even also needn't worry blast and fire etc. just in case heating agent has leaked in the circulatory system of water with the not so HFC-134a of property.In addition, be 0 because of HFC-134a does not have toxicity and depletion of the ozone layer coefficient, so earth environment protection aspect does not have problems.

3) above-mentioned solution (4), cooling water supplies to the pipeline of cooling water cooler in the factory and makes on any at least pipeline in the pipeline of this factory's intercooler of cooling water bypass in the same factory flow control valve is set in the factory after the machine that will cool off the power station, according to the aperture of this flow control valve of temperature regulation of cooling water in the factory of cooling power station machine, so can regulate the temperature of cooling water in the factory adaptably arbitrarily with the generation heat of power station machine.

Like this, no matter how many generation heats of power station machine has, can both guarantee heating, the gasification thermal source of LNG Liquefied natural gas really.In addition, owing to set cooling water temperature in the factory higher,, reduce the transmitting power of cooling water so can reduce cooling water inflow in the factory that supplies to the heating agent vaporizer.

4) in above-mentioned solution (5), water after will cooling off the suction air of gas turbine supplies to the pipeline of heating agent vaporizer and will cool off water after the power station machine and supplies on any at least pipeline in the suitable pipeline of heating agent evaporation flow control valve is set, the aperture of this flow control valve of temperature regulation according to the heat source water that supplies to the heating agent vaporizer, so can be as required with the resulting heat of cooling power station machine, supplemental heat source as the resulting heat of suction air of cooling gas turbine is used, and the temperature that supplies to the heat source water of heating agent vaporizer can be remained on specified value in addition.

5) in above-mentioned solution (6), the the 1st and the 2nd heating agent vaporizer is set, heat source water just cooled off the water after the suction air of gas turbine and cooled off in the high-temperature water after the power station machine at least any one, at first import the 2nd heating agent vaporizer, after the cooling, then import the 1st heating agent vaporizer, after the cooling, it is supplied at least any one party in the cooling water recirculation system in the factory of air-breathing cooler and power station.In addition, LNG Liquefied natural gas at first is imported into the 1st liquefied natural gas gasifying device, then supply to the 2nd liquefied natural gas gasifying device, the 3rd liquefied natural gas gasifying device successively, finally supply to the LNG Liquefied natural gas of the 3rd liquefied natural gas gasifying device, because of being heated, become the gasification rock gas more than 0 ℃ easily by the high temperature heating agent steam that takes place at the 2nd heating agent vaporizer.In addition, be used for the cooling water of the suction air of cooling gas turbine, temperature can be hanged down in the 1st heating agent vaporizer in the non-icing scope of cooling water.

This just means can make the temperature of gasification rock gas protect more than 0 ℃, and makes the cooling water temperature of cooling gas turbine suction air low simultaneously, thereby can improve the air-breathing cooling effect of gas turbine.

6) in above-mentioned solution (7), detect the heating agent pressure in the 1st heating agent vaporizer, relatively for make this heating agent pressure be definite value to regulate the signal of the water yield that supplies to the 1st heating agent vaporizer and wish to supply to the 1st heating agent vaporizer water output require signal, supply to the water yield of the 1st vaporizer by a wherein arbitrarily little Signal Regulation.In addition, the delivery volume of LNG Liquefied natural gas, be by detecting the heating agent pressure in the 1st heating agent vaporizer, relatively for make this heating agent pressure be the signal of the definite value delivery volume of wanting condition lng and hope the LNG Liquefied natural gas delivery volume require signal, by a wherein arbitrarily little Signal Regulation.

When these means of utilization, being set at greater than temperature as if the control target value with the heating agent pressure in the 1st heating agent vaporizer is the saturation vapor pressure of 0 ℃ heating agent, can not occur the phenomenon of water freezing in the heating agent vaporizer.

In addition, the control target value of the heating agent pressure that makes control LNG Liquefied natural gas delivery volume for greater than temperature be 0 ℃ heating agent saturation vapor pressure and be set under the condition less than the control target value of the heating agent pressure of control water output, be maximum summer at the air-breathing cooling effect of wishing gas turbine, the setting value (requiring signal) of water output is set at the flow that equipment allows, and the LNG Liquefied natural gas delivery volume is set at maximum value moves.Such one, water can not build-up ice and brings into play to greatest extent the performance of equipment, can obtain the cooling water that temperature was cooled, the air-breathing cooling effect that can make gas turbine is for maximum.

In addition, reduce the power that is used for the running of liquefied natural gas gasifying device in hope, promptly supply with winter of power of the pump of heat source water to the heating agent vaporizer, if adopt above-mentioned solution (4), (5), to supply to the heat source water temperature regulation of the 2nd heating agent vaporizer to high temperature, and the delivery volume of LNG Liquefied natural gas is set at desired value moves, the flow of heat source water can automatically become the necessary minimum discharge of gasification of its LNG Liquefied natural gas, can reduce the power of pump.

Fig. 1 is half system schematic of one embodiment of the invention.

Fig. 2 is half system schematic of residue of one embodiment of the invention.

Fig. 3 is the system schematic of the existing means of utilize LNG Liquefied natural gas the cold and hot air-breathing cooling of carrying out gas turbine.

Fig. 4 is the system schematic of existing liquefied natural gas gasifying device.

Fig. 1 and Fig. 2 are the system schematic of one embodiment of the invention.Just, X, Y, Z shown in the right-hand member of the X shown in the left end of Fig. 1, Y, Z and Fig. 2 are communicated with, and constitute the complete system diagram of present embodiment.Below, the state that here is communicated with both and describing.

Label (1) is the 1st heating agent vaporizer that is equipped with heat transfer tube bundle (1a) in shell.Be contained in the heating agent (A) of a side of the shell of the 1st heating agent vaporizer (1), by evaporating by water pipe (23) the water heating that (23i) flows in the heat transfer tube bundle (1a) from the water-supplying mouth.Vaporized heating agent steam is discharged from heating agent steam exhaust port (5 θ).The water that the latent heat of vaporization of heating agent (A) cooled off outside mobile in heat transfer tube bundle (1a), quilt was managed is discharged from drain opening (22 θ).

Label (2) expression is equipped with the housing of the U font tube bundle (4a) of the U font tube bundle (3a) of the 1st liquefied natural gas gasifying device (3) and the 2nd liquefied natural gas gasifying device (4).Import to a side of its housing (2) from heating agent steam supplying mouth (5i) through conduit (5) at the vaporized heating agent steam of above-mentioned the 1st heating agent vaporizer (1).On the other hand, LNG Liquefied natural gas is by LNG Liquefied natural gas supplying pipe (7), at first import to the 1st liquefied natural gas gasifying device (3) from LNG Liquefied natural gas supplying mouth (7i), by U font tube bundle (3a), (8 θ) is discharged to LNG Liquefied natural gas conduit (8) from the LNG Liquefied natural gas exhaust port, again by LNG Liquefied natural gas conduit (8), import to the 2nd liquefied natural gas gasifying device (4) from LNG Liquefied natural gas supplying mouth (8i), be discharged to LNG Liquefied natural gas conduit (9) from LNG Liquefied natural gas exhaust port (9 θ) by U font tube bundle (4a).LNG Liquefied natural gas is during reaching (4a) by U font tube bundle (3a), by heating agent steam heated, the gasification supplied with from heating agent steam supplying mouth (5i).

In addition, the heating agent steam is owing to heating, the liquefaction that is condensed of gasification LNG Liquefied natural gas, the interior circulation of shell that the heating agent that its condensation liquefaction is crossed is discharged, entered the 1st heating agent vaporizer (1) by conduit (6) from heating agent supplying mouth (6i) from heating agent exhaust port (6 θ).Promptly, accommodate the housing (2) of the 1st liquefied natural gas gasifying device (3) and the 2nd liquefied natural gas gasifying device (4), be arranged on than the 1st heating agent vaporizer (1) high position, position is set, make heating agent the 1st heating agent vaporizer (1) and accommodate the 1st liquefied natural gas gasifying device (3) and the housing (2) of the 2nd liquefied natural gas gasifying device (4) between can ownly circulate.

Also the 1st liquefied natural gas gasifying device (3) and the 2nd liquefied natural gas gasifying device (4) can be contained in the housing separately, import the heating agent steam that in the 1st heating agent vaporizer (1), takes place respectively.In addition, the formation number of liquefied natural gas gasifying device also can be selected arbitrarily.But the tube sheet that imports the 1st liquefied natural gas gasifying device (3) of ultralow temperature LNG Liquefied natural gas below-100 ℃ is gratifying from the thermal stress countermeasure for a short time, and it is excessive to be necessary to consider not make the heat transfer area of considering the 1st liquefied natural gas gasifying device (3).Therefore be preferably in only preheating LNG Liquefied natural gas of the 1st liquefied natural gas gasifying device (3), also be about to LNG Liquefied natural gas and be heated near the boiling point, carry out and will need the gasification operation of the LNG Liquefied natural gas of big calorimetric to be placed in the 2nd liquefied natural gas gasifying device (4).In addition, consider that from reducing the cost of equipment aspect it is very wise move that the 1st liquefied natural gas gasifying device (3) and the 2nd liquefied natural gas gasifying device (4) are contained in the housing (2).

Label (10) expression is equipped with the housing of the U font tube bundle (11a) of the tube bundle (12a) of the 2nd heating agent vaporizer (12) and the 3rd liquefied natural gas gasifying device (11), and the heating agent (A) that is contained in these housing (10) one sides is by (24i) flows in the heat transfer tube bundle (12a), arranges water to water pipe (23) from drain opening (23 θ) and heat and evaporate from the water-supplying mouth by water pipe (24).Vaporized heating agent steam, because heating flows into the LNG Liquefied natural gas in the U font tube bundle (11a) and at the tube wall condensation liquefaction of U font tube bundle (11a), is dropped to the liquid level of heating agent (A) by deadweight from LNG Liquefied natural gas supplying mouth (9i) by LNG Liquefied natural gas conduit (9).In addition, become gasification rock gas more than 0 ℃, be discharged to gasification rock gas conduit (13) by the vapor heated LNG Liquefied natural gas of heating agent from exhaust port (13 θ).

The 2nd heating agent vaporizer (12) and the 3rd liquefied natural gas gasifying device (11), with above-mentioned the 1st heating agent vaporizer (1) with to accommodate the housing of the 1st liquefied natural gas gasifying device (3) and the 2nd liquefied natural gas gasifying device (4) identical, be contained in the housing separately, and can be to couple together with heating agent steam conduit and heating agent fluid catheter housing with both sides, but consider that from reducing the cost of equipment aspect it is gratifying being contained in the same housing (10).

Be filled in the interior heating agent (A) of housing (10) of the 1st heating agent vaporizer (1) and the 2nd heating agent vaporizer, must be in the gasification of heating agent vaporizer, at the such material of liquefied natural gas gasifying device liquefaction, thus the promptly so-called material that under the operational condition of equipment for gasification, carries out gas-liquid phase change transmission heat.Preferably solidifying point low, do not burn, nontoxic and aspect the earth environment protection not in-problem material.For example use 1,2,2,2-HFC-134a (HFC-134a) is very suitable as such material.The solidifying point that is to say HFC-134a is low to-101 ℃, even in the occasion of the LNG Liquefied natural gas of gasification ultralow temperature, does not worry fully that also HFC-134a solidifies and hinders normal operation at the liquefied natural gas gasifying device.The maximum worry of obstruction liquefied natural gas gasifying equipment normal operation is that the heat source water in the heating agent vaporizer freezes, and individual problem can remain on more than 0 ℃ the interior heat medium temperature of heating agent vaporizer and solve by using means described later.

If HFC-134a is used as heating agent, then the liquid of heat source water and the non-flammable HFC-134a steam that carries out heat exchange, LNG Liquefied natural gas and non-flame properties HFC-134a carries out heat exchange.Just, resemble position the liquefied natural gas gasifying device in the past, that heat source water and LNG Liquefied natural gas are directly carried out heat exchange and all be excluded, do not exist LNG Liquefied natural gas to leak into possibility in the heat source water fully.

For example, even because of the defective LNG Liquefied natural gas of vaporizer has leaked in the heating agent steam, under the operational condition of heating agent, LNG Liquefied natural gas is not to exist with liquid form yet, and LNG Liquefied natural gas can not sneaked in the heating agent liquid of heating agent vaporizer one side.In addition, the LNG Liquefied natural gas that leaks in the heating agent steam becomes incondensable gas, hinders interior heating agent steam of vaporizer and the heat exchange between the LNG Liquefied natural gas.Therefore, even the leakage of trace, the pressure of heating agent vapor system also can rise to more than the saturation vapor pressure of hot media.

Therefore, owing to use suitable flow process instrument (not having among the figure) to monitor the pressure and temperature of heating agent vapor based, can detect the minute leakage of LNG Liquefied natural gas at an easy rate, in order to be than testing result, can prevent the leakage in the LNG Liquefied natural gas heat source water fully according to this countermeasure of supply of cutting off LNG Liquefied natural gas.In addition, LNG Liquefied natural gas can be detected by the coal gas detection means that is adopted in this gas fittings in the past at an easy rate to the leakage of atmosphere.Just can solve above-mentioned problem 1., the warm water of power station can be used as heat source water by present embodiment.

Label (21) is represented gas-turbine plant, is made of air compressor (21a), burner (21b), these capital equipments of gas turbine (21c).Fuel imports to burner (21b) with the gasification rock gas by gasification rock gas conduit (13), and combustion air is attracted to air compressor (21a) from air intake passage (19), supplies to burner (21b), and combustion gas are directed to gas turbine (21c).Such as known to everyone, because of the air compressor (21a) of gas turbine (21c) is the constant volume formula, when inhalation temperature uprised, the air quality that is attracted just diminished, and the result reduces the output of gas turbine.

Therefore, exist in the shortcoming that summer, generated energy reduced that electric power consumption increases, solve this shortcoming and also be the problem here.Promptly, in order to utilize the cold and hot of LNG Liquefied natural gas, the suction air of cooling gas turbine (21c), so on the air intake passage (19) of gas turbine (21c), connect the air-breathing cooler (20) of the suction air of cooling gas turbine (21c) by air inflow aperture (9i) and air outflow port (19 θ).

This air-breathing cooler (20) and above-mentioned the 2nd heating agent vaporizer (12) and the 1st heating agent vaporizer (1), by air-breathing cooling water circulating pump (25), with being linked in sequence of the conduit (24) of water, (23) and (22), constitute the circulatory system of the air-breathing cooling water of gas turbine.

Promptly, for the LNG Liquefied natural gas that makes the ultralow temperature below-100 ℃ becomes gasification rock gas more than 0 ℃, will be by the water that latent heat of vaporization cooled off at the heating agent of the 2nd heating agent vaporizer (12) and the 1st heating agent vaporizer (1) evaporation, the suction air of cooling gas turbine (21c), again the water that has been heated by suction air because of cooling gas turbine (21c), with heating agent heating, evaporation, make LNG Liquefied natural gas heating, gasification by the heating agent steam of this evaporation.

The suction air of gas turbine (21c) is cooling as far as possible preferably, to improve air-breathing cooling effect.Therefore in air-breathing cooler (20), be equipped with the band radiating fin heat transfer tube bundle (20a) of flowing water, be communicated with water-supplying mouth (22i) and drain opening (24 θ), heat transfer tube bundle as this air-breathing cooler, though can select various forms of tube bundles for use, but select for use the air flows pressure loss little, and the big band radiating fin tube bundle of the average heat transfer area of air-breathing cooler unit volume is better.

In order to improve air-breathing cooling effect, supply to the cooling water of air-breathing cooler (20), i.e. the cooling water water temperature of the 1st heating agent evaporator outlet (22 θ) though must reduce, but be not that water temperature can be at random low, it has the natural gas temperature of guaranteeing to gasify mustn't generate this restriction of ice more than 0 ℃ and in the water pipe of heating agent vaporizer.

But, according to present embodiment, because be used in the heating agent steam heated gasification rock gas of the 2nd heating agent vaporizer (12) by warm water heating, evaporation at last, even reduced the water temperature of the 1st heating agent evaporator outlet (22 θ), the gasification natural gas temperature also can become more than 0 ℃ at an easy rate.Have, to generate the dangerous position of ice be in the water pipe of the 1st heating agent vaporizer (1) though have in the water pipe again, as hereinafter described, also can be solved at an easy rate by present embodiment.

When the atmospheric temperature step-down, only use the heat of the suction air gained of cooling gas turbine just can not the necessary LNG Liquefied natural gas of full dose gasification burning turbine compound power-generating factory, but as its countermeasure, at present embodiment, the heat that cooling power station machine obtains, the thermal source that just in the past at all was not utilized also will utilize.

Label (31) is represented the machine of power station, and label (34) is represented cooling water circulating pump in water (cooling water in the factory) the circuit factory that makes the machine (31) that cools off the power station, and label (39) is represented by cooling water cooler in the factory of cooling water in the cooled with seawater factory.The general means of cooling power station machine (31) only is with conduit (33), (35) and (32) these machines to be coupled together, and makes it form cooling water recirculation system in the factory.

Just, cooling water in the factory that has been heated owing to cooling power station machine (31), after being attracted by cooling water circulating pump in the factory by conduit (33), supply to a side of the shell of cooling water cooler in the factory (39) from water inlet (35i) by conduit (35), by import, pass heat transfer tube bundle (39a) from conduit (40), after the cooled with seawater that conduit (41) flows out, discharge from water outlet (32 θ),, be used for the cooling of power station machine once more by conduit (32).

The disadvantage of this general means is cooling water temperature in the factory can not be adjusted to specified value, and the result is the gasification thermal source that the heat that obtains of cooling power station machine (31) can not be used as LNG Liquefied natural gas.But this problem adopts the means of present embodiment also can solve at an easy rate.

At present embodiment, be exactly on the basis of the pipeline (35) that is communicated with of the water inlet (35i) of cooling water cooler (39) in the water outlet (35 θ) of cooling water circulating pump in above-mentioned factory (34) and the factory, set up cooling water cooler in the bypass factory (39) and make the pipeline that cooling water flows through in the factory, the pipeline (36) that the pipeline (32) that will be communicated with the water outlet (32 θ) of cooling water cooler (39) in the factory and power station machine (31) is communicated with above-mentioned pipeline (35) just is set, make its adjusting supply to the water yield of cooling water cooler in the factory (39), just can be adjusted in the heat that removes of cooling water cooler in the factory (39).

In order to be adjusted in the heat that removes of cooling water cooler in the factory (39), present embodiment is cooling water cooler (39) and pipeline (36) that water is flow through in pipeline (35) that the cooling water cooler (39) in factory of cooling water circulating pump (34) in factory supplies water and bypass factory, the flow control valve (37a) of mutual counteragent and (37b) is set, use temperature detection accommodometer (37) to detect to be used to the temperature of cooling water in the factory of cooling off power station machine (31) simultaneously, according to its checkout value control flow rate control valve (37a) and aperture (37b).Flow through the water of flow control valve (37b) because cooling water cooler (39) is cooled in factory, so that its temperature ratio flows through the temperature of water of flow control valve (37a) is low.

Therefore, in the detected temperatures of temperature detection accommodometer (37) occasion lower than control target temperature, the aperture of flow control valve (37a) is to the direction action of opening, the aperture of the next flow control valve of reverse situation (37b) is controlled at control target value to the direction action of closing with cooling water temperature in the factory.The purpose of this control will be regulated the heat that removes of cooling water cooler in the factory (39) exactly, and the temperature of cooling water in the factory is controlled at specified value.Flow control valve (37a) even and (37b) only be provided with that any one is also passable, in addition, flow control valve the position is set so long as can regulate the position of the water output that feeds to cooling water cooler in the factory (39), also can select arbitrarily.

So, owing to adopted the means that cooling water temperature in the factory can be adjusted to specified value, the heat that cooling power station machine (31) obtains can be used as the gasification thermal source of LNG Liquefied natural gas.Conduit (38) specifically is set, so that conduit (35) connection of cooling water cyclic system in conduit (24) that the water inlet (24i) of the water outlet (24 θ) of above-mentioned air-breathing cooler (20) and above-mentioned the 2nd heating agent vaporizer (12) is communicated with by air-breathing cooling water circulating pump (25) and the above-mentioned factory, the water outlet (35 θ) of cooling water circulating pump in the above-mentioned factory (34) is communicated with, so that it can cooling water supplies to the heating agent vaporizer in power station machine (31) factory afterwards with cooling off with the water inlet (24i) of above-mentioned the 2nd heating agent vaporizer (12).

So, the heat that cooling power station machine (31) obtains just can be used as the gasification thermal source of LNG Liquefied natural gas indirectly by heating agent (A).

Also have, conduit (26), (28) that setting is communicated with above-mentioned conduit (24) and (35), and conduit (26), (29) that above-mentioned conduit (24) and (32) are communicated with, make the water inlet (35i) and water outlet (32 θ) connection of cooling water cooler (39) in the water outlet (24 θ) of above-mentioned air-breathing cooler (20) and the above-mentioned factory.Thus, cooled off the water after the suction air of gas turbine (21c), turned back to as such in the water inlet (35i) of cooling water cooler in the factory (39) or cooling water cooler (39) cooled off in factory the factory in the cooling water with cooling water in the factory that supplies to air-breathing cooling water recirculation system.

Supply to cooling water inflow in the factory of air-breathing cooling water recirculation system for adjusting, in the present embodiment, in the suction side and above-mentioned pipeline (38) of the air-breathing cooling water circulating pump (25) of the pipeline (24) that the water outlet (24 θ) of above-mentioned air-breathing cooler (20) is communicated with the water inlet (24i) of above-mentioned the 2nd heating agent vaporizer by air-breathing cooling water circulating pump (25), the flow control valve (30a) that carries out opposite action mutually and (30b) is set, use temperature detection accommodometer (30) to detect to supply to the temperature of the water of the 2nd heating agent vaporizer (12) simultaneously, according to its checkout value control flow rate control valve (30a) and aperture (30b).When carrying out this control, the water that will flow through flow control valve (30a) is used as cryogen, the water that will flow through flow control valve (30b) is used as high temperature fluid, under the detected temperatures of temperature detection accommodometer (30) situation lower than control target value, the aperture of flow control valve (30a) is to the direction action of closing, on the contrary, the aperture of flow control valve (30b) is to the action of the direction opened, and the controllable temperature of water that supplies to the heating agent vaporizer is built in specified value.Also have, flow control valve (30a), (30b), any one is also passable even only be provided with.In addition, it is provided with the position so long as can regulate the position of the water output that feeds to the 2nd heating agent vaporizer (10), then also can select arbitrarily.

The winter of low in atmospheric temperature, as not need cooling gas turbine suction air, only cooling water in the factory is supplied to the heating agent vaporizer, the water of heating agent evaporator outlet is not by air-breathing cooler (20), intactly turn back to that cooling water cooler exports in the current of (32 θ) in the water inlet (35i) of cooling water cooler in the factory (39) or the factory.Just, pipeline (22) that water inlet (22i) with the water outlet (22 θ) of the 1st heating agent vaporizer (1) and air-breathing cooler (20) is communicated with and the pipeline (27) that is communicated with above-mentioned and road (28) and (29) are set, will turn back to the water inlet (35i) of cooling water cooler in the factory (39) at the water that the heating agent vaporizer was cooled or the current of water outlet (32 θ) outflow of cooling water cooler (39) in factory.

To turn back to the water inlet (35i) of cooling water cooler in the factory (39) at the water that the heating agent vaporizer was cooled, want exactly that the seawater of water quench heats the water that was cooled at the heating agent vaporizer in the factory by being generally used for, especially the little power plant of processing heat of cooling water system in factory becomes effective means at the heat of vaporization source side face of guaranteeing LNG Liquefied natural gas.

In Japan,,, the ocean temperature around it is cooled to 1-4 ℃ water at the heating agent vaporizer even in the winter time also more than 7-8 ℃, can heating in the place of gas turbine combined cycle power stations that has the burning LNG Liquefied natural gas.Just, when the water that is cooled to 1-4 ℃ in the heating agent vaporizer, be heated near after the ocean temperature in the cooling water cooler in factory (39), further the generation heat by power station machine (31) is heated, and becomes the gasification thermal source of LNG Liquefied natural gas.The heat that the input heat of the seawater of cooling water cooler and power station machine (31) take place in only having from factory under the situation of necessary natural gas gasifying heat source insufficiency, just needs other liquefied natural gas gasifying auxiliary thermal source.

Aspect LNG Liquefied natural gas usefulness auxiliary thermal source, the water vapour that can obtain easily in the power station is suitable, can adopt industrial water vapor heater (not shown) commonly used, the means that adjusting supplies to the heat source water temperature of heating agent vaporizer are set on the discharge conduit of air-breathing cooling water circulating pump (25).

On the other hand, for the processing heat of cooling water system in the factory big and can guarantee the compound power-generating factory of the gasification thermal source of necessary LNG Liquefied natural gas fully, it is suitable that the water that has been cooled in the heating agent vaporizer turns back to the current that the water outlet (32 θ) of cooling water cooler in factory (39) flows out.Here it is will be used for the water that has been cooled the cooling of power station machine (31) in the heating agent vaporizer, thus, can alleviate the heat load of cooling water cooler in the factory (39), and the result can alleviate the load of the sea water pump that water quench is used in the factory.

Below the control device around the liquefied natural gas gasifying device of present embodiment is described.

The desired function of control system around the liquefied natural gas gasifying device is as follows:

1. under any service condition, in the water pipe of heating agent vaporizer, all must not generate ice.

2. should be able to follow the load capacity of the condition lng such as change of power generating equipment load.

3. in atmospheric temperature high summer, if the peak rate of flow that the delivery volume equipment of being set in of LNG Liquefied natural gas can be allowed, then should make cooling water inflow reach the peak rate of flow that equipment can allow, and cooling water temperature is the minimum temperature that equipment performance can reach, thereby makes the air-breathing cooling effect of gas turbine reach maximum.

4. in winter of the air-breathing cooling that does not need gas turbine, if the words of the delivery volume of LNG Liquefied natural gas are set on the fuel consumption same degree of establishing with generating ground, the heat source water flow that then supplies to the heating agent vaporizer should can be the necessary minimum discharge of gasification of LNG Liquefied natural gas, thereby reduces the power of pump.

Above function, the control device of using present embodiment can realize at an easy rate.

At first the flow control means with regard to water describe.Label (18a) representative supplies to the flow detector of the water of the 2nd heating agent vaporizer (12) and the 1st heating agent vaporizer (1), and label (18) is represented the flow-controlling meter of water, and label (18b) is represented the flow control valve of water.In addition, label (16b) is represented the Pressure testing accommodometer in the 1st heating agent vaporizer (1), and label (17) is represented the water flow signal selector.If the interior pressure of the 1st heating agent vaporizer (1) is below the setting value, then just action of Pressure testing accommodometer (16b) is that output signal becomes greatly so that increase the signal of water flow direction; Otherwise if pressure is more than the setting value, then just action of Pressure testing accommodometer (16b) is that output signal diminishes so that reduce the signal of water flow direction.

Water flow signal selector (17) has following function: accept the signal that requires of water output, i.e. the setting signal of water output and from the signal of Pressure testing accommodometer (16b); That signal that the aperture of selecting a little signal to be about to the flow control valve (18b) of water diminishes; This signal is outputed to the flow-controlling meter (18) of water.In addition, the flow-controlling meter of water (18) has the output signal of the testing signal of flow detector (18a) of input water and above-mentioned water flow signal selector (17), control signal is outputed to the function of the flow control valve (18b) of above-mentioned water.

Delivery volume control device with regard to LNG Liquefied natural gas describes below.

Label (14a) representative supplies to the LNG Liquefied natural gas flow detector of liquefied natural gas gasifying device, and label (14) is represented the flow-controlling meter of LNG Liquefied natural gas, and label (14b) is represented the flow control valve of LNG Liquefied natural gas.In addition, label (16a) is represented the Pressure testing accommodometer in the 1st heating agent vaporizer (1), and label (15) is represented LNG Liquefied natural gas flow signal selector.If the pressure in the 1st heating agent vaporizer (1) is below the setting value, opposite with the situation of the flow control of above-mentioned water, Pressure testing accommodometer (16a) action is that output signal diminishes so that reduce the signal of LNG Liquefied natural gas amount direction; In addition, if pressure is more than the setting value, Pressure testing accommodometer (16a) action is that output signal becomes greatly so that increase the signal of LNG Liquefied natural gas flow direction.

LNG Liquefied natural gas amount signal selector (15) has following function: the output signal that requires signal and Pressure testing accommodometer (16a) of accepting the LNG Liquefied natural gas delivery volume; That signal that the aperture of selecting both medium and small signals to be about to the flow control valve (14b) of LNG Liquefied natural gas diminishes; This signal is outputed to the flow-controlling meter (14) of LNG Liquefied natural gas.Have, the flow-controlling meter of LNG Liquefied natural gas (14) has the testing signal of input LNG Liquefied natural gas flow detector (14a) and the output signal of LNG Liquefied natural gas flow signal selector (15), control signal is outputed to the function of above-mentioned LNG Liquefied natural gas flow control valve (14b) again.

If the pressure in the 1st heating agent vaporizer (1) almost equates with the saturation vapor pressure of heating agent in this vaporizer, and the saturation vapor pressure of the heating agent when being set at Pressure testing accommodometer (16a) and setting value (16b) greater than 0 ℃, then the heat medium temperature in the 1st heating agent vaporizer (1) can be less than 0 ℃, water can not freeze in the tube bundle (1a) of the 1st heating agent vaporizer, and supply to the 1st heating agent vaporizer (1) warm water before, in the tube bundle (12a) of the 2nd heating agent vaporizer that is supplied to, also can not generate ice.

In addition, if the permission minimum the when setting value of the Pressure testing accommodometer (16a) of condition lng flow is set at the delivery volume that makes LNG Liquefied natural gas and is the peak rate of flow that equipment allowed (for example saturation vapor pressure of the heating agent 0 ℃ the time), and will regulate water flow Pressure testing accommodometer (16b) even setting value be set at when the load change of LNG Liquefied natural gas heat medium temperature and also do not become pressure below 0 ℃ (for example saturation vapor pressure of the heating agent 1 ℃ the time), then in the water pipe of heating agent vaporizer, can not generate ice, also follow the tracks of the load change of LNG Liquefied natural gas, and make the air-breathing cooling effect of gas turbine reach maximum running and the pump power of above-mentioned air-breathing cooling water circulating pump (25) is realized easily for minimum running.

Its reason is described below in further detail.

Now, consider a problem under following state: it is that the setting value of water output is set at the peak rate of flow that equipment can allow that water output is required signal; The saturation vapor pressure of the heating agent the when setting value of Pressure testing accommodometer (16a) is set at 0 ℃; The saturation vapor pressure of the heating agent the when setting value of Pressure testing accommodometer (16b) is set at 1 ℃, and the heat source water temperature of air-breathing cooling water circulating pump (25) outlet is controlled in the temperature of regulation.

At first, when because of the air-breathing cooling effect that will make the combustion aircraft turbine engine for maximum purpose with the LNG Liquefied natural gas delivery volume require signal gate to be decided to be maximum value the time, pressure in the 1st heating agent vaporizer (1) is near the setting value of Pressure testing accommodometer (16a), and heat medium temperature is reduced near 0 ℃.When becoming this state, the output signal of the Pressure testing accommodometer (16b) of the flow of adjusting water becomes and requires signal big than water output, become water output from the output signal of water flow signal selector (17) and require signal, the peak rate of flow (setting value) that the delivery volume equipment of being controlled in of water can allow.

On the other hand, the output signal of the Pressure testing accommodometer (16a) of condition lng flow becomes and requires signal little than LNG Liquefied natural gas delivery volume, become signal from Pressure testing accommodometer (16a) from the output signal of LNG Liquefied natural gas flow signal selector (15), the delivery volume of control LNG Liquefied natural gas is so that the pressure in the 1st heating agent vaporizer (1) becomes the setting value of Pressure testing accommodometer (16a).

At such state because the delivery volume of the delivery volume of water and LNG Liquefied natural gas is the peak rate of flow that equipment can allow, and the 1st heating agent vaporizer (1) in heat medium temperature also become minimum temperature, so the water that is cooled off by this heating agent also becomes low temperature.Just, supply to the cooling water of air-breathing cooler (20), be.The peak rate of flow that equipment can allow is brought into play equipment performance to the maximum limit and is cooled off, and it is maximum that air-breathing cooling effect also reaches.In addition, at such state, water flow velocity maximum in the water pipe (1a) of the 1st heating agent vaporizer (1), it is the condition that ice is difficult to generate, and the load of LNG Liquefied natural gas also reaches maximum, being the condition that the load of LNG Liquefied natural gas is not risen, is 0 ℃ even make the heat medium temperature in the 1st heating agent vaporizer (1), also must not worry to generate in water pipe ice.And, when carrying out such operation, though the gasification amount of natural gas sometimes greater than the fuel consumption of power station, in this case, remaining gasification rock gas is diverted and is done other fuel.

The characteristic that the delivery volume of winter of not needing air-breathing cooling etc., LNG Liquefied natural gas is less than system under the situation of fuel consumption of power station describes below.

When with LNG Liquefied natural gas require signal sets to be minimum value the time, pressure in the 1st heating agent vaporizer (1) will be near the setting value of Pressure testing accommodometer (16b), heat medium temperature rises near 1 ℃, the output signal of Pressure testing accommodometer (16b) becomes and requires signal little than water output, become signal from Pressure testing accommodometer (16b) from the output signal of water flow signal selector (17), the delivery volume of water is controlled by the necessary minimum discharge of setting value that the pressure in the 1st heating agent vaporizer (1) becomes Pressure testing accommodometer (16b).

On the other hand, the output signal of the Pressure testing accommodometer (16a) of condition lng flow becomes and requires signal big than LNG Liquefied natural gas delivery volume, become the signal that requires of LNG Liquefied natural gas delivery volume from the output signal of LNG Liquefied natural gas flow selector (15), the delivery volume of LNG Liquefied natural gas is controlled by the signal that requires of LNG Liquefied natural gas delivery volume.

Just, present embodiment is to make the thermal source water yield of the LNG Liquefied natural gas of gasification regulation be in essential minimum, can save liquefied natural gas gasifying and operate needed power.Especially in the winter that does not need air-breathing cooling, when the means of using above-mentioned (4), when setting the heat source water temperature higher, the effect of reducing of the needed power of gasification operation of LNG Liquefied natural gas can further improve.In addition, below the critical value of delivery volume in installed power of LNG Liquefied natural gas, the load of LNG Liquefied natural gas rises under the condition that may occur, heat medium temperature in the 1st heating agent vaporizer (1) remains on high temperature, and the flow of heat source water also moves under the state that the equipment surplus is arranged, even under the situation that the load of LNG Liquefied natural gas has been risen, in the water pipe of the 1st heating agent vaporizer (1), can not generate ice and can carry out the gasification operation of LNG Liquefied natural gas.

And, at present embodiment, to connect conduit (22) → (27) that and connect conduit (24) → (26) of going out from the water outlet (20 θ) of the 1st heating agent vaporizer (1) from the water outlet (24 θ) of air-breathing cooler (20), as respectively with the conduit (28) that connects the water inlet (35i) of cooling water cooler (39) in factory and connect the conduit that the conduit (29) to water outlet (32 θ) is communicated with and be illustrated, and if in above-mentioned conduit (27), (26), (28) and flow control valve or flow rate regulating valve be installed respectively in the way of (29) as required, make each flow control valve or flow rate regulating valve control closely relatedly or adjust mutually, with the corresponding colourful flow distribution of the operation conditions of power station be to control, adjust.Much less, such application examples is included within the technological thought scope of the present invention.

And the present invention is not limited to the foregoing description, much less in being shown in the scope of the present invention of claim scope, can add various changes in its concrete formation.

As from above detailed explanation clear and definite, can obtain following effect according to the present invention:

(A) utilize liquefied rock gas cold and hot of the gas turbine combined cycle power stations of gas-firing, the suction air of cooling gas turbine is feasible, can prevent the reduction that the power station was exported during summer.

(B) because at the heat of vaporization source side face of the liquefied rock gas of power station, the resulting thermal source of suction air that cooling gas turbine is not only arranged, can also utilize the resulting high-quality thermal source of machine of cooling power station as required and from the heat of advancing of the seawater of cooling water cooler in the requisite factory in power station, so that makes in the winter time also the LNG Liquefied natural gas of gasifying electricity generation factory necessary amounts stably, simultaneously, not only in the winter time, can also save the needed power of gasification operation and the auxiliary thermal source of LNG Liquefied natural gas.

(C) because in the heat exchange of carrying out liquefied natural gas gasifying equipment and power generating equipment, use the closed-loop system of cooling water in the factory when promptly carrying out above-mentioned (A), (B), not only can avoid and resembling with the setting of seawater as the special equipments such as seawater taking and discharging equipment the equipment of liquefied natural gas gasifying in the past of liquefied natural gas gasifying thermal source, maintenance at marine growth parasitism, these equipment of adhering to, and cold, the warm water problem of utilizing seawater to bring to the discharging in public marine site etc., and because be closed-loop system, so also guarantee the water quality of cooling water in the factory easily.

(D) owing to carry out the heat exchange of heat source water and LNG Liquefied natural gas by the not so heating agent of property, can prevent inflammable gas from liquefied natural gas gasifying equipment outside system, especially to the leakage of power generating equipment, can guarantee the safety of power station when stating (A), (B), (C) on the implementation.

(E) liquefied natural gas gasifying equipment provided by the invention, be a kind of load change with the power station can be suitable for the gasification rock gas of power station fuel with necessary amount all the time and can remove the normal running of obstruction equipment, in equipment this worry of water freezing, fuel for power generation equipment that reliability is high.That is, aspect the power generating equipment superior in performance, Security and Economy, that versatility is high, the invention provides a kind of liquefied natural gas gasifying device of gas turbine combined cycle power stations of only gas-firing.

Claims (7)

1. the liquefied natural gas gasifying device of the gas turbine combined cycle power stations of a gas-firing, it is characterized in that: it comprises, provide the rock gas that gasified fuel by heating agent steam heated LNG Liquefied natural gas across metallic walls, the liquefied natural gas gasifying device of this heating agent steam of condensation simultaneously as gas turbine; The water heating makes its evaporation at the above-mentioned heating agent liquid of this liquefied natural gas gasifying device condensation, produces above-mentioned heating agent steam, and the while is the heating agent vaporizer of above-mentioned water; By the above-mentioned water cooling of crossing in this heating agent evaporator cools after the suction air of gas turbine of gas turbine combined cycle power stations of gas-firing, water is returned to the air-breathing cooler of above-mentioned heating agent vaporizer; Cool off the machine cooler of above-mentioned power station machinery equipment; And can be in the water that will be sent to above-mentioned heating agent vaporizer with the heat supply of the above-mentioned machine that obtains at this machine cooler.

2. the liquefied natural gas gasifying device of the gas turbine combined cycle power stations of a gas-firing, it is characterized in that it comprises: by heating agent steam heated LNG Liquefied natural gas, make the liquefied natural gas gasifying device of this heating agent vapour condensation simultaneously across metallic walls; The water heating makes its evaporation at the above-mentioned heating agent liquid of this liquefied natural gas gasifying device condensation, produces above-mentioned heating agent steam, simultaneously with above-mentioned water-cooled heating agent vaporizer; Air-breathing cooler by the suction gas of the gas turbine of the gas turbine combined cycle power stations of the above-mentioned water cooling gas-firing of crossing in this heating agent evaporator cools; Supply with cooling water cooler in the factory of water of the machine cooling make above-mentioned power station by natural cold and heat sources such as seawater; To in this factory, make in the cooling water cooler and cool off the pipeline that the cooling water circulating pump water outlet is communicated with the water inlet of cooling water cooler in the above-mentioned factory in the above-mentioned power station machine water-cooled factory afterwards; Cooling water cooler in the above-mentioned factory of bypass, the pipeline that the water outlet of cooling water circulating pump in the above-mentioned factory is communicated with the machine of above-mentioned power station; The pipeline that the water outlet of above-mentioned air-breathing cooler is communicated with the water inlet of above-mentioned heating agent vaporizer; The pipeline that the water outlet of cooling water circulating pump in the above-mentioned factory is communicated with the water inlet of above-mentioned heating agent vaporizer; The pipeline that the water outlet of above-mentioned heating agent vaporizer is communicated with the water inlet of above-mentioned air-breathing cooler; With the water outlet of the water outlet of above-mentioned heating agent vaporizer and above-mentioned air-breathing cooler at least any one with above-mentioned factory in the water inlet of cooling water cooler and any one pipeline that is communicated with at least of water outlet.

3. the liquefied natural gas gasifying device of the gas turbine combined cycle power stations of gas-firing as claimed in claim 1 or 2, it is characterized in that: above-mentioned heating agent is 1,2,2,2-HFC-134a (HFC-134a).

As power must ask the liquefied natural gas gasifying device of gas turbine combined cycle power stations of 2 or 3 described gas-firings, it is characterized in that it comprises: cooling water temperature adjusting flow control valve in the factory that is provided with in any at least pipeline of cooling water cooler in pipeline that the water outlet of cooling water circulating pump is communicated with the water inlet of cooling water cooler in the above-mentioned factory in above-mentioned factory and the above-mentioned factory of bypass, pipeline that the water outlet of cooling water circulating pump in the above-mentioned factory is communicated with above-mentioned power station machine; Detect the temperatuer detector of the temperature of the water that cools off above-mentioned power station machine; Regulate the means of the aperture of cooling water temperature adjusting usefulness flow control valve in the above-mentioned factory according to the checkout value of this temperatuer detector.

5. as the liquefied natural gas gasifying device of the gas turbine combined cycle power stations of claim 2,3 or 4 gas-firings of being recorded and narrated, it is characterized in that it comprises: at pipeline that the water outlet with above-mentioned air-breathing cooler is communicated with the water inlet of above-mentioned heating agent vaporizer and the heating agent vaporizer that is provided with in any at least pipeline of the pipeline that the water outlet of cooling water circulating pump is communicated with the water inlet of above-mentioned heating agent vaporizer in above-mentioned factory supply with coolant-temperature gage and regulate and use flow control valve; Detection supplies to the temperatuer detector of temperature of the water of above-mentioned heating agent vaporizer; Regulate above-mentioned heating agent vaporizer according to the checkout value of this temperatuer detector and supply with the means that coolant-temperature gage is regulated the aperture of using flow control valve.

6. as the liquefied natural gas gasifying device of the gas turbine combined cycle power stations of claim 2,3,4 or 5 described gas-firings, it is characterized in that it comprises: being accommodated in top has gas phase heating agent, bottom that the 1st heating agent vaporizer in the above-mentioned liquid phase portion in the 1st heating agent evaporator shell of liquid phase heating agent is arranged; Be accommodated in be provided with the position than above-mentioned the 1st heating agent vaporizer the position height is set, top is used with the pipeline that is communicated with of gas phase heating agent in above-mentioned the 1st heating agent evaporator shell is connected and the 1st liquefied natural gas gasifying device and the 2nd liquefied natural gas gasifying device in the bottom is used with the pipeline of liquid phase heating agent connection in above-mentioned the 1st heating agent evaporator shell is connected the housing; Be accommodated in the 3rd liquefied natural gas gasifying device in the gas phase heating agent portion on top in the housing of having enclosed heating agent; Be accommodated in the 2nd heating agent vaporizer in the liquid phase heating agent portion of bottom in the housing of having enclosed above-mentioned heating agent; The LNG Liquefied natural gas of above-mentioned the 1st liquefied natural gas gasifying device is exported the pipeline that is communicated with the LNG Liquefied natural gas inlet of above-mentioned the 2nd liquefied natural gas gasifying device; The LNG Liquefied natural gas of above-mentioned the 2nd liquefied natural gas gasifying device is exported the pipeline that is communicated with the LNG Liquefied natural gas inlet of above-mentioned the 3rd liquefied natural gas gasifying device; The pipeline that the water outlet of cooling water circulating pump in the water outlet of the water inlet of above-mentioned the 2nd heating agent vaporizer and above-mentioned air-breathing cooler and the above-mentioned factory is communicated with; The pipeline that the water outlet of above-mentioned the 2nd heating agent vaporizer is communicated with the water inlet of above-mentioned the 1st heating agent vaporizer; The pipeline that the water outlet of above-mentioned the 1st heating agent vaporizer is communicated with the water inlet of above-mentioned air-breathing cooler.

7. the liquefied natural gas gasifying device of the gas turbine combined cycle power stations of gas-firing as claimed in claim 6, it is characterized in that: this gasification installation comprises water output control device and LNG Liquefied natural gas delivery volume control device, wherein, this water output control device comprises: detect the pressure in above-mentioned the 1st heating agent vaporizer, the Pressure testing accommodometer of output control signal, import the signal that requires of the output signal of same Pressure testing accommodometer and water output, with the water flow signal selector of a wherein less arbitrarily signal as the setting signal output of water output, detection supplies to the water flow detector of flow of the water of above-mentioned the 1st heating agent vaporizer, import the output signal of the testing signal and the above-mentioned water flow signal selector of same water flow detector, the water flow accommodometer of output water flow control signal, and control by the output signal of same water flow accommodometer, feed to the water output control valve of above-mentioned the 1st heating agent vaporizer; LNG Liquefied natural gas delivery volume control device comprises: detect the pressure in above-mentioned the 1st heating agent vaporizer, the Pressure testing accommodometer of output control signal, import the signal that requires of the output signal of same Pressure testing accommodometer and LNG Liquefied natural gas delivery volume, with the LNG Liquefied natural gas flow signal selector of a wherein less arbitrarily signal as the setting signal output of LNG Liquefied natural gas delivery volume, detection supplies to the LNG Liquefied natural gas flow detector of the LNG Liquefied natural gas flow of above-mentioned the 1st liquefied natural gas gasifying device, import the output signal of the testing signal and the above-mentioned LNG Liquefied natural gas flow signal selector of same LNG Liquefied natural gas flow detector, the LNG Liquefied natural gas flow accommodometer of output LNG Liquefied natural gas flow control signal, and the LNG Liquefied natural gas inlet that is arranged at above-mentioned the 1st liquefied natural gas gasifying device, the LNG Liquefied natural gas flow control valve of the output signal control of the above-mentioned LNG Liquefied natural gas flow accommodometer of foundation.

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