DE169739C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

CLASS 46a:

Patented in the German Empire on July 22, 1904.

The regulation of gas turbines, which are operated by a jet of burnt gases of a high-tension mixture of air and fuel, possibly with the addition of a coolant such as water or steam, can be carried out in various ways. Either the exit openings or the exit times or the exit pressure of the jet can be changed, or these various changes can be combined with one another. The outlet openings can be changed by either changing the cross-sections of the outlet nozzles or their number. Given the high temperatures of the nozzle and of the working medium in front of the nozzle, the change in the cross section of the nozzle encounters great practical difficulties. _l The change in the

ao number of effective nozzles by having a number of effective combustion chambers arranges which! can be switched on and off in different numbers an erratic regulation which has an unfavorable influence on the steady gait is. The second way of changing exit times by introducing intermittent effects like the one Parsons' steam turbine is hardly feasible with gas turbines, because there you have the highly heated, burnt gases cannot pass well through shut-off devices, so would have to the working medium is interrupted before it enters the combustion chamber

■ 35. steer and you would alternate through Kiliing and emptying of the combustion 45

Chamber received very strong pressure fluctuations, which the efficiency of the turbine affect unfavorably.

You are therefore led to control by changing the operating pressure. This '. is advantageously generated in gas turbines by rotating fans, which, like overpressure steam turbines, are provided with guide vanes and rotor blades, gradually bring the gases sucked through under higher pressure in numerous pressure stages.

The subject of the invention relates to a method for regulating the of such rotating fan generated pressure while maintaining as high as possible Efficiency at all loads. If you namely the usual with piston blowers Regulation of the pressure, consisting of throttling the sucked in gases or recirculation, the gases in the suction line, transfers to the rotating fan, so-one obtains poor efficiencies at low power levels because the flow passes through all the blades and therefore all of them have friction, which is not significantly less than at full load. The present proceedings avoids this inconvenience in that depending on the intended operating pressure ι by the regulator of the machine stages can be switched on or off, with the switched off Steps the gases no longer perform any relative movement and therefore the due to this friction caused in elimination comes.

In the drawing is a rotating fan with six groups of five levels each

70

Claims (1)

shown. The gases enter from the left through the valve body into one of the stage groups a, b, c, rf and leave the fan under pressure through nozzles / ″. The highest pressure is generated when entering the stage group tr, because then all six stage groups a, b, c, rf, c, f 'are passed through, the lowest pressure when entering the stage group rf, because then only the groups rf, e, / ίο be run through. The switching on and off of the stage groups is done by the controller of the turbine by setting suitable flow organs. In the exemplary embodiment shown, the controller moves a piston valve g which, in the position shown, enables access through the channel 'rf' to the step group rf. With further shift to the right, the channels c ', b', a ' are exposed one after the other, ao, however, in such a way that only one of the channels is always open. Instead of putting the gases under full pressure with a rotating fan, in certain cases only for the a5 lower pressures a circumferential and use a piston blower for the higher pressures. This has the advantage that . for the lower pressures, the small space requirement and the convenient 30 · uses the rotating fan (which can be directly coupled to the turbine), while the better efficiency of the piston fan is valuable for the higher pressures. In this case nothing more would be changed in the overall arrangement than that the connection d ' would be brought into connection with the high-pressure piston blower, which then replaces the stages d, e. / Of the rotating blower. The regulation of the existing circulating fan a, b, c by switching step groups on and off would not be affected by this. Instead of switching entire groups of levels on and off, you can also use the controller the individual stages can be switched on and off, and the controller can do both act on the fuel pump as on the air pump as well as on both. It can It may be advantageous to switch off the step groups, in which there is still a certain amount of friction #S | is generated by the turbulence that forms between the impellers and idlers, in connection with the condenser to reduce this friction. Ρλtent-AnspkucII: Process for regulating gas turbines by changing the inflow pressure of the fuel air mixture, characterized in that the controller of the .Machine according to the load, more or less pressure levels or pressure level groups of the circulating fan or turns off. : For this t sheet of drawings.