JP2007056817A - Gas turbine system including water purifying apparatus and method for operating same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas turbine system including a water purifying apparatus materializing improvement of efficiency of a gas turbine and simplification of exhaust heat recovery boiler structure. <P>SOLUTION: This gas turbine system including the water purifying apparatus is provided with a gas turbine device, an exhaust heat recovery boiler using combustion exhaust gas of the turbine as heat source, and the water purifying apparatus forming water from salt water with using steam generated by the exhaust heat recovery boiler as heat source. A regenerator heating mixed gas of steam generated by the exhaust heat recovery boiler and air supplied from a compressor of the gas turbine device by combustion exhaust gas of the turbine is provided, and the mixed gas heated by the regenerator is supplied to a combustor of the gas turbine device. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a gas turbine system having a water production apparatus for producing water from seawater, and in particular, a gas turbine having a water production apparatus for producing water from seawater using steam generated by utilizing exhaust heat of the gas turbine as a heat source. About the system.

  The steam generated by the steam generator of the exhaust heat recovery boiler using the combustion exhaust gas of the gas turbine is supplied to the combustor of the gas turbine, and the hot water or steam heated by the heater of the exhaust heat recovery boiler is supplied from seawater. A technique for supplying a water source as a heat source for a water production apparatus is disclosed in Patent Document 1.

JP 2003-312588 A

The water production apparatus disclosed in Patent Document 1 supplies hot water or steam as a heat source for evaporating seawater from an exhaust heat recovery boiler that generates steam or the like by using combustion exhaust gas of a gas turbine. Necessary steam conditions The temperature is preferably at least 100 ° C. and less than about 200 ° C. at which seawater evaporates, and the pressure is about 0.5 MPa to 1 MPa. On the other hand, in a normal gas turbine, the air temperature at the compressor outlet serving as combustion air is about 300 ° C. Therefore, when the same steam of less than about 200 ° C as the steam supplied to the water production device is supplied from the exhaust heat recovery boiler to the combustor of the gas turbine, the temperature of the combustion air is lowered and the temperature of the combustion gas is kept constant. There is a problem that the efficiency of the gas turbine decreases because the amount of fuel must be increased in order to maintain it.

  An object of the present invention is to provide a gas turbine system having a water production apparatus that realizes improvement in efficiency of a gas turbine and simplification of the structure of an exhaust heat recovery boiler, and an operation method thereof.

  A gas turbine system having a water production apparatus of the present invention includes a compressor that compresses air, a combustor that burns air and fuel compressed by the compressor to generate combustion gas, and a combustion gas that is generated by the combustor. A gas turbine device having a turbine that is driven to obtain power, a heat recovery steam generator that generates steam using the combustion exhaust gas of the turbine as a heat source, and water from seawater using the steam generated in the exhaust heat recovery boiler as a heat source A water production apparatus, and a regenerator that heats an air-fuel mixture obtained by mixing steam generated in the exhaust heat recovery boiler and air supplied from a compressor of the gas turbine apparatus using the combustion exhaust gas of the turbine as a heat source, The air-fuel mixture heated by the regenerator is configured to be supplied to the combustor of the gas turbine device.

  Further, the operation method of the gas turbine system having the water production apparatus of the present invention generates combustion gas by combusting air and fuel compressed by the compressor of the gas turbine apparatus in the combustor, and the turbine is driven by this combustion gas. The steam is generated by using the exhaust gas from the turbine as a heat source by the exhaust heat recovery boiler, and the steam generated in the exhaust heat recovery boiler by the water production apparatus is used as the heat source from the seawater. Mixing the water generated, supplying a part of the generated water as feed water for the exhaust heat recovery boiler, and mixing the steam generated in the exhaust heat recovery boiler with the air supplied from the compressor of the gas turbine device The air is heated using the combustion exhaust gas of the turbine as a heat source, and the heated air-fuel mixture is supplied to the combustor of the gas turbine device.

  ADVANTAGE OF THE INVENTION According to this invention, the gas turbine system which has the water production apparatus which can improve the efficiency of a gas turbine and can simplify the structure of an exhaust heat recovery boiler is realizable.

  The purpose of improving the efficiency of the gas turbine and simplifying the structure of the exhaust heat recovery boiler has been realized with a gas turbine system having a water production device for producing water from seawater.

  Hereinafter, a gas turbine system having a water production apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.

  A gas turbine system having a water production apparatus to which the present invention shown in FIG. 1 is applied includes a gas turbine apparatus 1, an exhaust heat recovery boiler 100, and a water production apparatus 200.

  The gas turbine device 1 is supplied through a fuel system 12 and a compressor 2 that compresses and pressurizes the atmosphere 6, and is supplied through an air flow path 7 that is pressurized by the compressor 2 or is extracted. A combustor 3 that burns the fuel 12a to generate combustion gas, a turbine 4 that is driven by the combustion gas generated by the combustor 3 and serves as a drive source for the compressor 2 and the generator 13 that is a load, The combustion exhaust gas 8a discharged from 4 is guided as a heat source through the exhaust gas flow path 8 to heat the high-humidity vapor, and the heated humid air 11a is supplied to the combustor 3 through the high-humidity air supply flow path 11. The regenerator 5 is configured.

  The regenerator 5 mixes the superheated steam 21a generated in the exhaust heat recovery boiler 100 with the mixer 10 installed on the inlet side and the pressurized air 7a supplied or extracted from the compressor 2. The steam / air mixture 15a mixed with the pressurized air 7a exchanges heat with the combustion exhaust gas 8a discharged from the turbine 4 in the regenerator 5 to form high-temperature high-humidity air 11a. It is supplied to the combustor 3 through the passage 11 and combusts with the fuel 12a to generate a high-temperature combustion gas, and this combustion gas drives the turbine 4 to generate power. The power generated in the turbine 4 drives the compressor 2 and also drives the generator 13 to obtain an electrical output. Further, the combustion exhaust gas 9 a that has passed through the regenerator 5 flows down to the exhaust heat recovery boiler 100 through the exhaust gas passage 9.

The exhaust heat recovery boiler 100 is configured by sequentially arranging a economizer 103, an evaporator 102, and a superheater 101 from the upstream high temperature side to the downstream low temperature side in the flow direction of the combustion exhaust gas 9a. And the water 201a produced | generated from the seawater 203a by the water manufacturing apparatus 200 is pressurized with the pump 206, and is supplied to the economizer 103 of the exhaust heat recovery boiler 100 as feed water. The feed water 104a whose temperature has been increased by heat exchange with the combustion exhaust gas 9a in this economizer 103 is supplied to the evaporator 102. Similarly, saturated steam 105a generated in the evaporator 102 by heat exchange with the combustion exhaust gas 9a is supplied to the superheater 101. Supplied. In this superheater 101, superheated steam is generated by heat exchange with the combustion exhaust gas 9a. Superheated steam 21a, which is a part of this superheated steam, is supplied to the mixer 10 through the steam supply pipe 21 and supplied from the compressor 2. It becomes superhumid air by mixing with the pressurized air 7a. Moreover, the heating steam 202a which is a part of the superheated steam generated in the superheater 101 is supplied as a heat source to the water production apparatus 200 through the supply pipe 202.

  In the water production apparatus 200, the seawater 203a supplied from the outside through the seawater supply pipe 203 is evaporated by the heat of the heating steam 202a supplied as a heat source from the superheater 101 of the exhaust heat recovery boiler 100 to generate water 201a, and the rest Seawater 204 a containing salt is discharged to the outside through the piping system 204. A part of the water 201 a generated by the water production apparatus 200 is pressurized by the pump 206 to the economizer 103 of the exhaust heat recovery boiler 100 and supplied as water supply through the water supply pipe 201. A part of the water 201a generated by the water production apparatus 200 is taken out and used as drinking water and domestic water 205a through the piping system 205.

  Here, the temperature of the heating steam 202a of the heat source required for the water production apparatus 200 is sufficient if it is about 200 ° C. at which the seawater 203a can be evaporated, and the pressure may be about 1 MPa.

  On the other hand, in the gas turbine device 1 having the regenerator 5, the heat of the combustion exhaust gas 8a of the gas turbine is recovered to increase the temperature of the combustion air, thereby saving the amount of fuel burned by the combustor 3 and High efficiency is achieved. Therefore, the temperature of the combustion exhaust gas 8a should be as high as possible. Further, since the temperature of the combustion exhaust gas 8a decreases when the pressure is increased, the pressure of the combustion exhaust gas 8a of the gas turbine flowing down to the regenerator 5 may be about 1 MPa. That is, in the regenerative gas turbine, it is possible to share steam as a heating source necessary for the water production apparatus and steam supplied to the combustor of the gas turbine. In a gas turbine that does not have a regenerator, an independent heat exchanger system that generates steam to be supplied to the combustor 3 of the gas turbine is discharged separately from a heat exchanger system that generates steam as a heat source necessary for the water production apparatus 200. It is necessary to have in the heat recovery boiler 100. However, the gas turbine having the regenerator can be used even if the steam conditions of the steam used in the combustor 3 of the gas turbine 1 and the water production apparatus 200 are the same. The heat recovery boiler 100 may have a common heat exchanger system that shares the generated steam. Therefore, since the configuration of the exhaust heat recovery boiler 100 can be simplified, it can be manufactured at low cost.

The temperature of the superheated steam 21a supplied from the exhaust heat recovery boiler 100 to the regenerator 5 through the steam supply pipe 21 is about 200 ° C., and the pressure of the combustion gas flowing into the turbine 4 of the gas turbine device 1 is about 1 MPa. The temperature of the pressurized air 7a pressurized by the compressor 2 is about 300 ° C. By mixing the pressurized air 7a supplied from the compressor 2 and the superheated steam 21a with the mixer 10 installed on the inlet side of the regenerator 5, the air / steam mixture 15a flowing into the regenerator 5 is mixed. The temperature becomes lower than 300 ° C., and the amount of heat that can be recovered from the combustion exhaust gas 8a by the regenerator 5 is increased as compared with the case where the superheated steam is not mixed, so that the efficiency of the gas turbine can be improved. Further, the high humidity air 11a generated by mixing the superheated steam 21a is supplied to the combustor 3 through the high humidity air supply passage 11 and combusts together with the fuel 12a. The working gas amount of the gas turbine corresponding to is increased, and the gas turbine output can also be increased. Furthermore, since not only the combustion air 7a but also the high humidity air 11a is combusted together with the fuel 12a in the combustor 3, the NOx of the combustion gas can be reduced.

  In the present embodiment, the steam supply pipe 21 which is a system for supplying the superheated steam 21a generated in the superheater 101 of the exhaust heat recovery boiler 100 to the mixer 10 installed at the inlet of the regenerator 5 of the gas turbine 1, and A valve 301 and a valve 302 are respectively installed in a supply pipe 202 which is a system for supplying the heated steam 202a to the water production apparatus 200. And since the supply_amount | feed_rate of steam can be controlled by operating the opening degree of these valves 301 and 302, the electric power generation amount of a gas turbine and the production amount of water can be adjusted. For example, when water is produced with the highest priority, the valve 301 is fully closed and the valve 302 is fully opened, whereby the entire amount of steam can be supplied to the water production apparatus 200 to produce water with the maximum capacity. Further, when producing electricity with the highest priority, the valve 301 is fully opened and the valve 302 is fully closed, so that the entire amount of steam is supplied to the regenerator 5 of the gas turbine apparatus 1 as an air-fuel mixture. It can generate electricity with its capacity. Further, by changing the amount of steam supplied from the exhaust heat recovery boiler 100 to the gas turbine and the amount of steam supplied to the water production device, the power generation amount of the gas turbine and the production amount of water can be adjusted every day. In addition, the plant can be optimally operated according to seasonal power demand and water demand, improving operability.

  Moreover, although the structure which drives a generator with a gas turbine apparatus was used in the present Example, it is applicable also when driving machines, such as a pump, with a gas turbine, or when using for the propulsion force for ships.

  The present invention can be applied to a gas turbine system having a water production apparatus.

1 is an overall system diagram of a gas turbine system having a water production apparatus according to an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Gas turbine apparatus, 2 ... Compressor, 3 ... Combustor, 4 ... Turbine, 5 ... Regenerator, 7 ... Air flow path, 7a ... Pressurized air, 8, 9 ... Exhaust gas flow path, 8a, 9a ... Combustion Exhaust gas, 11 ... high humidity air supply channel, 11a ... high humidity air, 21 ... steam supply piping, 21a ... superheated steam, 13 ... generator, 100 ... exhaust heat recovery boiler, 101 ... superheater, 104a ... feed water 105a ... saturated steam, 200 ... water production apparatus, 201 ... water supply piping, 201a ... water, 202 ... supply piping, 202a ... heating steam, 203a ... seawater, 206 ... pump, 301, 302 ... valves.

Claims (5)

  A gas turbine apparatus comprising: a compressor that compresses air; a combustor that combusts air and fuel compressed by the compressor to generate combustion gas; and a turbine that is driven by the combustion gas generated by the combustor to obtain power. The exhaust heat recovery boiler that generates steam using the combustion exhaust gas of the turbine as a heat source, the water production device that generates water from seawater using the steam generated in the exhaust heat recovery boiler as the heat source, and the exhaust heat recovery boiler generated A regenerator that heats an air-fuel mixture obtained by mixing steam and air supplied from a compressor of the gas turbine device using the combustion exhaust gas of the turbine as a heat source, and the air-fuel mixture heated by the regenerator is A gas turbine system having a water production apparatus configured to be supplied to a combustor.   A first system that supplies steam generated in the exhaust heat recovery boiler to the regenerator of the gas turbine device from the exhaust heat recovery boiler, and a second system that supplies water to the water production apparatus from the exhaust heat recovery boiler The steam amount supplied to the regenerator of the gas turbine device from the exhaust heat recovery boiler and the steam amount supplied to the water production device are respectively configured to be controllable. A gas turbine system having a water production apparatus.   3. The water production apparatus according to claim 2, wherein a third system for supplying a part of the water generated by the water production apparatus as feed water for the exhaust heat recovery boiler is disposed from the water production apparatus. A gas turbine system.   Air and fuel compressed by a compressor of a gas turbine device are combusted in a combustor to generate combustion gas, and the turbine is driven by this combustion gas to obtain power, and the exhaust gas from the turbine is exhausted by an exhaust heat recovery boiler. Is used as a heat source to generate steam, water is generated from seawater using the steam generated in the exhaust heat recovery boiler as a heat source by a water production apparatus, and a part of the generated water is generated in the exhaust heat recovery boiler The mixed gas obtained by mixing the steam generated in the exhaust heat recovery boiler and the air supplied from the compressor of the gas turbine apparatus is heated using the combustion exhaust gas of the turbine as a heat source, and this heated mixing An operation method of a gas turbine system having a water production apparatus, wherein gas is supplied to a combustor of a gas turbine apparatus. The amount of steam supplied as an air-fuel mixture from the exhaust heat recovery boiler to the combustor of the gas turbine device and the amount of steam supplied as a heat source of the water production device from the exhaust heat recovery boiler were controlled respectively. A method for operating a gas turbine system having the water production apparatus according to claim 4.

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