Method for cooling apparatus for cooling a gas turbine and a device for its implementation

 

(57) Abstract:

Method for cooling apparatus for cooling gas turbine gas and steam turbine plant comprising the first evaporating circuit with a steam drum, includes a cooling apparatus for cooling by heat exchange with circulating connected to the steam drum in the second evaporative circuit environment. The temperature of the cooling medium regulating by temperature, circulating in the second evaporative circuit environment. Regulation of the temperature of the cooling medium produced by the injection of condensate in a separate evaporator loop. The invention allows to provide sufficient cooling of the gas turbine. 2 S. and 4 C.p. f-crystals, 1 Il.

The invention relates to a method for cooling apparatus for cooling gas turbine gas and steam turbine installation, containing the steam drum to the first evaporator circuit. It is directed further to a device for cooling apparatus for cooling gas turbine gas and steam turbine installation for implementing this method.

Gas and steam turbine is typically used to produce electrical energy. When this vapor is directed in isparitelh is when couples are attracted to energy.

In the evaporation path is designated as the loop natural circulation, partial evaporation directed work environment occurs in the evaporator, and the circulation of the working environment is ensured by re-evaporation of the differences of pressure and/or due to the geodetic location of the evaporator and the steam drum. Alternative evaporating circuit can also be a loop forced circulation, in which the circulation of the working medium is provided with a circulation pump, and the working environment is also at least partially evaporated in the evaporator. As with natural circulation and forced circulation of the mixture of water-water/steam from the evaporator down in the evaporation path of the steam drum. In the steam drum water and steam are separated, and the water from the steam drum again is led to the evaporator.

Full evaporation with subsequent partial overheating of the working environment in the passage through the evaporator is in the path of a single forced circulation as the evaporator, in which the passage of the working medium is also provided with pumps.

Regardless of what the principle of natural circulation, mn the productivity of the gas turbine and thus to achieve the highest possible efficiency of such a gas and steam turbine installation, strive to have at the inlet of the gas turbine is particularly high temperature of the working gas, for example, from 1000 to 1200oC. Such a high temperature at the inlet of the turbine entails, of course, problems of material, in particular, regarding the heat resistance of turbine blades.

The increase of temperature at the inlet of the turbine may be valid when the turbine blades are cooled so that they always have a temperature lying below the permissible material temperature. From EP-PS 0379880 know that you want to allow compressed in a given gas turbine compressor air and cool this serves as a means of cooling the air before entry into the gas turbine. Selected from the cooling air cooling the heat can be used, for example, as heat of evaporation and used to drive a steam turbine. As evaporation system used for expansion evaporator with circulation pump and expansion vessel. From the steam drum of the evaporator taken water, which is heated by heat exchange with serving as a cooling medium for the gas turbine cooling air and then evaporated by expanding in Russia of the cooling air of the gas turbine is designed for a specific temperature difference between selected from the steam drum water and cooling air. If, for example, due to mode peak loads or during the selection process steam pressure in the evaporation path and thus the temperature of the water in the steam drum increases, it also increases the temperature of the cooling air of the gas turbine. Thus practically the cooling of the cooling air to the cooling of the gas turbine temperature is no longer ensured, which can cause failure of the gas turbine.

From EP-A-0106313 and GB-A 2264539 respectively known gas turbine, the cooling means which can be cooled by circulating cooling in the heat exchanger, and the temperature of the cooling medium may change.

The basis of the invention therefore have the task of specifying a method for cooling apparatus for cooling gas turbine gas and steam turbine installation containing steam dryer evaporative circuit, which is particularly simple way in all modes of operation sufficient cooling of the gas turbine. This should be achieved with a particularly suitable device.

This challenge is for gas and steam-turbine plant of the aforementioned type, in which a coolant of the gas turbine to cool the nutrient loop, is solved according to the invention that the temperature of the cooling medium gas turbine set by changing the defined heat exchanger parameters, in particular by changing the temperature of the medium circulating in a separate evaporator loop. The setting of the temperature produced by the injection of condensate in a separate evaporator loop.

This cooling apparatus for cooling gas turbine is designed not only for a certain temperature difference between the coolant of the gas turbine and the cooling means, cooling means cooling.

The invention proceeds from the consideration that by the changes caused by the heat transfer parameters, in particular by changing the temperature of circulating in a separate evaporator loop environment, the cooling apparatus for cooling the gas turbine can be matched to any mode of operation of the gas and steam turbine installation. Thus the temperature of the cooling medium gas turbines regardless of the temperature difference between the cooling means and the circulating medium can be maintained at a sufficient cooling of the gas turbine value.

It turned out that by injection to the water and thus also the temperature of the cooling medium gas turbines can particularly effectively be adjusted over a wide range. In particular, the high temperature difference between the injected condensate and circulating in a separate evaporator loop environment makes effective opportunity for change determining the heat transfer parameters. Enter the condensate through the injection support in addition due to the jet or the suction action of the injection recirculation in a separate evaporator loop or starts the circulation during commissioning. Also when working gas and steam-turbine plant at peak load is sufficient cooling apparatus for cooling gas turbine, nearly all the water / steam circuit of the gas and steam-turbine plant, the amount of condensate is possible to inject in a separate evaporator loop.

To avoid perepiski steam drum injected in a separate evaporator loop condensation, and excess water is expedient to release from the steam drum to the tank feed water gas and steam turbine installation.

Separate evaporating circuit may be a circuit of a natural circulation loop multiple forced circulation or single prinadlagala, you can bring to the process of production of steam, gas and steam turbine installation.

Of the device for cooling apparatus for cooling gas turbine gas and steam turbine installation containing steam dryer evaporative circuit, the above problem is solved by the fact that connected on the secondary side with a feeder apparatus for cooling gas turbine, the heat exchanger is connected on the primary side through a separate evaporating circuit to the steam drum. For injection of condensate in a separate evaporator loop and thereby to change the temperature of the cooling means cooling the gas turbine cooling means provided for the injection of the connection between the supply line of feed water to the steam drum and a separate evaporator loop.

The injection of the compound is preferably grosseserratus and/or lockable. For draining excess water from the steam drum the steam drum is connected to the feedwater tank of gas and steam turbine installation, it is advisable with the possibility of locking.

Achieved the advantages of the invention consist, in particular, that due to the use of cooling means cooling gastellum circuit, and by possible, if necessary, of zapisywania condensate in a separate evaporator loop cooling apparatus for cooling gas turbine is ensured in all operating modes of gas and steam turbine installation, in particular also at peak load. Such a device for cooling apparatus for cooling gas turbine can be designed optimally with regard to the criteria of efficiency mode rated load gas and steam turbine installation without the need of choice uneconomical stock options for working at peak load. Cooling apparatus for cooling a gas turbine, in particular at peak load, is provided through the possible temperature control medium circulating in a separate evaporator loop through the injection of condensate so that such gas and steam turbine can be used particularly flexibly and cost-effectively. In addition, at the start of the gas turbine with growing heat input is possible aims forced flow of the medium circulating in a separate evaporator loop through the heat exchanger, which is favorable impact on behaviour at the start and in the. This figure shows schematically a gas and steam turbine installation with a device for cooling the cooling medium for the gas turbine.

Schematically presented in figure gas and steam turbine installation 1 includes a gas turbine 2 with included after it on the side of the gas generator on the exhaust heat 4, the heating surfaces which are included in the steam-water cycle b of the steam turbine 8. The heating surfaces are low pressure heater 10, the evaporator low pressure 12 and the low pressure superheater 14.

After the steam turbine 8 switched capacitor 16 which is connected via the condensate pump 18 and the inlet of the feedwater pipeline 20 with the low pressure heater 10. Last on the output side via a closing valve 22 supply line 24a is connected to the tank to feed water 26 and parallel to the pipeline 24a, through the closed valve 28 pipeline 24b with a steam drum or separator steam-water mixture 30. On the output side to the tank to feed water 26 connected to the supply line 32 for supplying feedwater to the unrepresented area of the evaporator high pressure gas and perturbingly circuit 34 evaporator low pressure 12. Evaporating circuit 34 is a circuit natural circulation. However, it may also be a circuit of multiple forced circulation or once forced circulation.

On the side of the outlet steam of the steam drum 30 through the pipe 36 is connected to the low pressure superheater 16, which, on its part through the pipe 38 is connected on the output side with a steam turbine 8. In addition, the steam drum 30 through a lockable gate 39 and pipe 40 is connected to the tank to feed water 26.

To the steam drum 30 is connected to the second or separate evaporating circuit 41. In a separate evaporating circuit 41 login is enabled on the primary side of the heat exchanger 42. Separate evaporating circuit 41 is a circuit natural circulation, however, it may also be a circuit of multiple forced circulation or once forced circulation. The heat exchanger 42 is included in the incoming gas turbine 2 pipe cooling air 43. The piping of the cooling air 43 however, there are marked points a and b connection to the gas turbine 2.

Supply feedwater pipeline 20 through injection soy is inim evaporative circuit 41. The injector contains 48 while the injection nozzle 50.

When working gas and steam turbine installation 1 arising during the combustion in the gas turbine 2 hot and at high pressure flue gas RG expand in the gas turbine 2. Advanced flue gas RG is sent to the steam generator to the exhaust heat 4 and is used there to produce steam for the steam turbine 8. Staying in the steam drum 30 of the working tool or the water W through the evaporative circuit 34 is led to the evaporator low pressure 12 and it is completely or partially converted into steam-water mixture WD. The steam-water mixture WD again down to the steam drum 30, in which pairs D sephirot from W. water Taken from the steam drum 30 useful pairs of N through the pipe 36 is led to the low-pressure superheater 14 and there overheat, and then by pipe 38 to the steam turbine 8, in which it expands. The expanded steam is sent to the condenser 16 and condense there. Thus obtained condensate is pumped by the condensate pump 18 in the inlet pipe to feed water 20 to the low pressure heater 10 and thence by the pipe 24a to the tank to feed water 26 or by pipeline 24b to steam Baraba to provide sufficient cooling of the gas turbine 2, the temperature of the cooling air L should not exceed the maximum value. This requires cooling of the cooling air L, which is achieved by heat exchange in the heat exchanger 42. Thus the heat exchange in the heat exchanger 42 is happening with the water W, circulating connected to the steam drum 30 separate evaporative circuit 41. To control the temperature of the cooling air L gas turbine 2 you can change the parameters that determine the heat transfer of the cooling air L with water W. In particular, it is possible to regulate or throttle mass flow circulating in a separate evaporative circuit 41 of the water W. in Addition, you can set the temperature TWcirculating in a separate evaporative circuit 41 environment W.

To install this temperature TWpreferably through a connecting pipe 46 and the injector 48 condensate K is withdrawn from the supply pipe to feed water 20 and injected into separate evaporating circuit 41. Selected thus the condensate K with temperature Tk40oC is significantly colder than the current from the steam drum 30 in the evaporating circuit 41 water W with temperature TW150ogsupplied to the heat exchanger 42 cooling medium G of the mixture of the condensate K and water W through the installed valve 45 of the supplied amount of condensate K. Thus, is also adjustable temperature cooled by heat exchange in heat exchanger 42 of the cooling air L gas turbine 2. When operating in mode peak-load gas - and steam-turbine plant 1 a sufficient cooling of the cooling air L gas turbine 2 is provided by increasing the injected in a separate evaporating circuit 41 number of condensate K.

Through the injection of condensate K in a separate evaporating circuit 41 increases circulating generally in connected to the steam drum 30 evaporative circuits 34, 41 the number of the working environment W water and steam D. Therefore going in the steam drum 30 excess water W is released through the pipe 40 into the feedwater tank 26.

During the injection of condensate K in a separate evaporating circuit 41 through the injection nozzle 50 is achieved by jet action. Due to the achieved in this case the effect of trapping and suction actions can support or initiate the circulation of the working environment or water W in a separate esprital (2) gas and steam turbine installation (1) containing a steam drum (30) first evaporator circuit (34), in which the cooling means (L) is cooled by heat exchange with circulating connected to the steam drum (30) second evaporator circuit (41) medium (W), and the temperature of the cooling medium (L) is adjusted by changing the temperature (Tg) circulating in the second evaporator circuit (41) of the medium (W) and regulate the temperature of the cooling medium produced by the injection of condensate (K) in a separate evaporating circuit (41).

2. The method according to p. 1 for containing a reservoir of feed water (26) gas and steam turbine installation (1), characterized in that the excess water (W) are released from the steam drum (30) in the feedwater tank (26).

3. The method according to p. 1 or 2, characterized in that the separate evaporator loop (41) represents the contour of a natural circulation loop multiple forced circulation or once forced circulation.

4. Device for cooling the cooling medium (L) of the gas turbine (2) gas and steam turbine installation (1) containing a steam drum (30) first evaporator circuit (34), which is connected on the secondary side with the feeder funds cooling (43) of the gas turbine (2) heat exchanger (42) is connected on the primary side of the tion (44) between the inlet of the feedwater pipeline (20) to the steam drum (30) and a separate evaporator circuit (41).

5. The device according to p. 4, characterized in that the injection of the compound (44) is grosseserratus and/or lockable.

6. The device under item 4 or 5, characterized in that there is a lockable pipe (40) for draining off excess water (W) from the steam drum (30) in the feedwater tank (26).

 

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