Turbine with heat intensifier

CROSS REFERENCES TO RELATED APPLICATIONS

This application is a continuation-in-part application of "Dual Rotor Dual Fluid Turbine", Ser. No. 413,258, filed 11/6/73, now U.S. Pat. No. 3,889,471 and "Rotary Heat Exchanger with Cooling", Ser. No. 474,729, filed 5/30/74.

BACKGROUND OF THE INVENTION

This invention relates generally to turbines for generating power wherein a fluid is passed through a turbine.

There have been various types of turbines known previously, and in some of these, a working fluid is accelerated in stationary nozzles and then said fluid is passed inward toward rotor center generating power by reaction in such rotor. These conventional turbines require normally a pressurized fluid from a suitable source for their operation.

SUMMARY OF THE INVENTION

It is the object of this invention to provide a power turbine combined with a heat intensifier wherein heat is converted to power directly. This turbine also provides a means wherein relatively low temperature heat can be used to generate power, this being made possible by the use of said heat intensifier portion together with a turbine portion, with the temperature of available heat being increased within said heat intensifier portion, with power being generated within said turbine portion, using heat delivered from said heat intensifier.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an axial cross section of the turbine, and

FIG. 2 is an end view of the unit.

DESCRIPTION OF PREFERRED EMBODIMENTS

Referring to FIG. 1, therein is shown a cross section of the turbine. 10 is casing supporting bearings 36 and 27, and shafts 37 and 23. 11 is first rotor, 12 and 13 form a heat exchanger for transferring heat from the heat intensifier portion to the turbine portion, said heat exchanger being the high temperature heat exchanger which may be formed by heat pipes 12 and fins 13, 15 are openings, 16 is wall between heat intensifier portion and turbine portion, 17 are openings, 18, 19, 30 and 33 are vanes, 20 is heat addition heat exchanger for the heat intensifier portion, 21 and 22 are coolant entry and exit, 24 and 26 are heating fluid entry and exit, 28 and 34 are fluid passages, 39 is cooling heat exchanger for heat intensifier portion, 31 is heat exchanger for turbine portion cooling, 32 are second fluid nozzles, discharging forward in the direction of rotation into the second rotor 40.

In operation, the cavities of the rotors are filled with a first fluid within the heat intensifier space and a second fluid within the turbine space. The first rotor is caused to rotate, and the first fluid is compressed by centrifugal force when moving outward toward rotor periphery within spaces defined by vanes 18, said compression being accompanied by a temperature increase. Heat is transferred from said first fluid into high temperature heat exchanger near the rotor periphery, and then said first fluid is passed through openings 17 and inward through passages defined by vanes 19. After expansion and during latter part of expansion, heat is added into the first fluid in heat exchanger 20, and the first fluid passes then through opening 28 and through cooling coil 39, to be again compressed thus completing its work cycle.

Within the turbine side, the second fluid circulates through the first and second rotor passages. Second fluid is compressed and accelerated in outward extending passages defined by vanes 30 and heat is added into the second fluid in the high temperature heat exchanger near the periphery, and then the second fluid passes through openings 15 and then through nozzles 32 being discharged forward, into second rotor inward passages defined by vanes 33. After deceleration within the second rotor 40, the second fluid passes into first rotor cooling heat exchanger 31 via openings 34, to be again accelerated thus completing its work cycle.

In the FIG. 2, end view of the turbine is shown with portions removed to show internal details. 10 is casing, 11 is first rotor, 12 and 13 are heat pipes and fins for the high temperature heat exchanger, 19 are vanes, 17 are openings for first fluid, 20 is heat addition heat exchanger, 23 is a shaft for first rotor, 32 are nozzles for second fluid, 33 are vanes, 40 is second rotor, 15 are second fluid openings, and 38 indicates the direction of rotation for both rotors.

The first fluid and the second fluid are selected so that the temperature increase during the compression is greater for the first fluid, thus providing for the needed temperature differential required for heat transfer from first fluid to second fluid.

The first fluid is provided with a cooling heat exchanger near the first rotor center, as indicated, using heat exchanger 39. This cooling is provided mainly to increase the density of the first fluid in passages defined by vanes 18; such density increase will assist in the circulation of said first fluid within rotor.

The high temperature heat exchanger is shown to be made of heat pipes and fins. Other forms of heat exchangers may be used to transfer heat from said first fluid into said second fluid. Similarly, various types of heat exchangers may be used for adding heat into the fist fluid, and removing heat from the first and second fluids.

In FIG. 1, it is shown that the same cooling fluid is being used for cooling both first fluid and second fluid; separate fluids may be used, if desired, with separate supply to each heat exchanger from outside rotor.

The heat addition fluid and the cooling fluid may be liquids or gases, as desired.

The rotors are shown to be mounted within a casing with a vent 29 which can be used to evacuate the said casing. The rotors may also be mounted on open supports, if desired.

Normally, the second rotor is contained within the first rotor with bearing and seal 35 being provided to seal second fluid within the rotors. Obviously, in a different arrangement, the second rotor could be extented to contain first rotor, if desired. Such changes do not change the spirit of the invention. Also, various controls may be added to the turbine, as desired.

The locations of the several heat exchangers may be varied to suit the operating requirements of the first and second fluids being used. Generally, the high temperature heat exchanger is located near the rotor periphery for best efficiency, and the heat addition heat exchanger is located nearer to rotor center from said high temperature heat exchanger. The cooling heat exchanger in the heat intensifier portion is usually near the center or may extend into the outward extending passage to provide cooling during early part of compression. The cooling heat exchanger for the turbine portion may be located as desired generally inward from the said high temperature heat exchanger. The sizes of these heat exchangers are determined conventionally. The cooling heat exchanger for the heat intensifier portion may be deleted if desired if the temperatures of the other fluids permit, and the internal details of the vanes, and openings permit. It should be noted in this connection that the lengths of the vanes radially may also be varied with longer vanes usually on the compression side of the heat intensifier portion or the turbine portion; further, the vanes may be curved in conventional manner thus improving the fluid circulation within the rotors.

It should be noted that the high temperature heat exchanger can be made of finned turbing similar to the construction of the heat addition heat exchanger, and the heat transfer from the heat intensifier portion into the turbine portion be carried by circulating heat transfer fluid. In such arrangements, the actual heat addition into the second fluid can then be carried out within heat exchanger coils placed within the second rotor passages, such heat addition also may be done in both first and second rotors. Theoretically, such changes in the locations of heat exchangers do not change the basic principles of operation of this turbine. The form shown in FIG. 1, is believed to be the easiest and economically best construction, and for that reason, only the form shown in FIG. 1 was illustrated.

It also should be noted that the cooling heat exchanger can be placed within the said second rotor if desired.