US1587420A - Turbine installation - Google Patents

Description

June 1 1926.

1,587,420 E. L. RICHARDSON TURBINE INSTALLATION Filed March 6, 1924 Inventor: Er n esb L. Richardson, by /i H i S Attorney.

Patented June 1, 1926.

UNITED STATES PATENT OFFICE.

ERNEST L. RICHARDSON, OF MELROSE HIGHLANDS, INIASSACHUSE'ITS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

TURBINE INSTALLATION.

Application filed March 6, 1924.

The present invention relates to turbine installations wherein the feed water for the boilers, which feed water comprises the condensate from the condenser of the main tur' bine, is heated to the desired temperature by steam taken from some source of low pressure supply such as for example, the exhaust trom a non-condensing auxiliary turbine, the supply of heatingsteam being regulated in accordance with the requirements for heating steam.

The object of the invention is to provide an improved construction and arrangement for regulating the auxiliary steam supply in accordance with the heating requirements, and for a consideration of what I believe to be novel and my invention, attention is directed to the accompanying description and the claims appended thereto.

In the drawing, Fig. 1 is a diagrammatic view of an installation embodying my invention, and Fig. 2 is a detail thereof in cross-section, on a greatly enlarged scale.

Referring to the drawing, 1 indicates a condensing steam turbine which receives steam from a main 2 through a conduit 3 and exhausts into a condenser at. Main 2 may be supplied with steam from a suitable boiler or boilers. 5 indicates the hot well of the condenser from which the water is withdrawn by a pump 6 through a conduit '7 and discharged through a conduit 8 to a suitable heater 9 which is supplied with heating steam from a low pressure stage of turbine 1 by a conduit 10. From heater 9 the water flows through a conduit 11 to a heater 12 which is shown as being of the closed type, and after being heated in heater 12 it is discharged through a conduit 13 to a storage tank 1 1 from which it may be fed back to the boiler (not shown) through a pipe 15.

Heating steam for heater 1?. is supplied through a conduit 16 and in the present instance is shown as being supplied by the cxhaust from a non-condensing turbine 17. 'lurbine 17 is supplied with steam from main 2 through a conduit 18 and has its exhaust opening connected directly to conduit 16. The flow of steam through conduit 18 to turbine 1'? is controlled by a valve 19 operated by a servo-motor 20 which is connected to a speed governor 91. The governor is provided with a synchronizing spring -22which is adjusted by a motor 28.

Serial No. 697,402.

This governor and valve arrangement indicated in the drawing is a well known one, the operation of which is well understood.

In the present instance turbine 17 is shown as being a part of three unit exciter set, 2% being the exciter of the set and 25 the motor of the set. However, the turbine may drive any suitable load. In an arrangement of this character, the steam supplied through conduit 16 to heater 12 is regulated by regulating the amount of steam supplied to the turbine, only sullicient steam being supplied to turbine 17 to meet the requirements for heating steam. The condensate from heater 1:? collects in a well 26 and may be supplied through a conduit 27 to the inlet of heater 9, a pump 28 being used it required.

My invention relates especially to the regulating of the supply of heating steam through conduit 16 to heater 12 so as to maintain an even heating of the water and according to my invention, I regulate the supply of heating steam in accordance with the pressure of the steam being supplied for heating purposes and the temperature of the heated water as it flows from the heater, the arrangement being such that the supply of heating steam can be increased only when there is a decrease in both the pressure of the heating steam supply and the temperature of the water leaving the heater and that the supply of heating steam can be decreased only when there is an increase in both the pressure of the heating steam supply and the temperature of the water leaving the heater. By this means I am enabled to maintain a more even heating of the water and prevent wide, repeated fluctuations of the steam supply.

In the arrangement illustrated in the drawing, 29, and 30 are two pairs of spaced contacts adapted to be bridged by a connector 31 attached to a pressure responsive device 32 which is connected to conduit- 16 by a pipe Pressure responsive device may be of the well-known form compris ing a diaphragm contained in a casing and upon which the pressure acts, the arrangement being such that upon an increase in pressure connector 31 will be raised to bridge contacts 29 and upon a decrease in pressure connector 31 will be lowered to bridge contacts 30. At Maud 35 are two pairs of spaced contacts adapted to be bridged by a i to a temperature re sponsii'edmice 34' arranged to respond to the ternpcrature of the heat d water flowing from heater 12, the arrangement being such that upon an increase in. temperature connector 06 will be raised to bridge contacts 34; and upon a decrease in temperature it will be lowered to bridge contacts 35. Any suitable type of tei'nperatur-e responsive device may be used, a known type comprising a diaphragm 38 moved by the expansion of 2' liquid contained in it and in its connecting tube 39 which has a closed end d1 located in conduit 13 where it is exposed to the ternperature ot the water flowing through the conduit, as shown in Fig; 2.

Contacts 29 and 3 are connected in series with each other and to motor and a suitable source of potential e0 in such manner that when co 1 acts and 34. are hridgedby coin ectorsbl and 36 respectively a circuit closed. through motor 2?; to e'tleet its opei'ation in a direction to close somewhat are?) thus causing a decrease in the supplyot heating steani, and contacts 3 and 35 are connected in series with each other and to motor L3 {and source of potential 4C0 in such manner that when they are bridged by c-onn-ectz'zrs 31 and a circuit is closed through motor 23 o etlect its operation in a direction to open somewhat valve l9vthus puniding an incruise in the supply of heating steain.

in use. the teinierz ture contacts 3+1 and 35 are set for the desired temperature range so that when the temp rati e of the teed 1 water troii'i 12 rea'ehescthe upper limit (it its 1': n connector 3) bridges contacts 3% and when the ten'iperaturc reaches the lower nit connector 36 lii bridges contacts 35. Contarts 29 and St) are then set so that with a su 'iply ting: steain which will heat the tired water ...i heater 12 to the upper temperature liinit, the pressure in conduit 16 will hold connector -31, in engagement with contacts and with a su iply of heating steam wh'ch wilt heat the water to the lower temperature lli'illttli? pressuit, in conduit 16 wll be such that (-iinnectoi. 31 will bridge ctmtacts 30.

Assume now and :uixiliai'r .i nc unit 17 are started and an condeiser t enters heatei e lnder these conditic will 1 contacts eratur low temperature of the water leaving heater 12. circuit is thus closedthroiigh motor 38 to c" so it to operate on the valve gear in asdir ion to etfect theopciiing of waive 19, thus inc easihg the supply oi heating'stea' u .a he'atcr,. means for meme supplict through conduit 16. Valve 19 will be tullfv' opened and will remain open until the water in heater 12 heats up to the point where the How or" steal provides heat faster than it can be absorbed whereupon the pressure in conduit 16 will increase causing connector 31 to move from engagement with cts 2-50 into engagement with contacts Fol owing this, the tem ierature reach-es a value at which connector 86 will be moved engagement with contacts 35 to en- 5 with contacts 3 1- thus completing circuit on. motor 28 to operate it in a diaction to move valve 19 toward closed posi- Va-lve 19 will be then moved toward no closed posit'on until it reaches a point ere the pressure in conduit 16 drops beow the high value for which contacts 29 are set whereupon connect r 3]. will move away .troni contacts ltl and open the circuit on motor 23. A balanced condition lsthus estabFishiul at which the water in heater 12 "h the above dincribed arrangement it Y it will be seen. that when the circuit is closed n motor 523 by the temperature responsive device cooperating with the pressure responsive iflevice 31 2 main clo ed unt l quired such circuit does not re- :ie temprature change reon the temperature rei the outtlowing water but i as the pressure of the aches normal value again.

of the circuit is tent of the heat capacity or T] renders tl e tcn'ipcrature sensitive because it re. )onds i=3 liQfii'iPU' M 1 1 By tins in i rendered indepenr the heater. 'rontrol more (uvpkiv nioie to changes in the si'ipply ot heating steun hue preventing chances in teinpmiatnrc producing corrispondinglv too great IilL i i suppl oi? heating; steam 1 i 1 1- and h nce wuat inn}, be teiinen hunting or,

i the heating steam sup- :1 ol the tcnujierature at the water. What I claim as new and desire to secure by Letters Patent ot' the U ed States is:

It. in an apparatus of the character describerh the coinbinationof a heater; n'ieans for supplying liquid thereto to be heated, means for supplying heating: elastic fluid thereto, and means responsive tothe pressure of theheating elastic fiuidand the tei'nperature of the liquid leaving the heater itorycontrolling the supply of heating elastic fluid. 2 In cconibination a condensing.turbine, coin ing condensate m the turbiii' tetlie heater a eoi'iduit tor LIK supplying heating elastic fluid to the heater, a valve means controlling the flow of heating elastic fluid through such conduit, and means responsive to both the temperature of the water leaving the heater and the pressure of the elastic fluid supplied thereto for controlling said valve means.

3. In combination, a condensing turbine, a heater, means for conveying condensate from the turbine to the heater, a conduit for supplying heating elastic fluid to the heater, a non-condensing turbine, means tor conveying the exhaust from it to the heater to heat the condensate, a valve gear controlling the admission of elastic fluid to the turbine, and means responsive to the temperature 01' the condensate flowing from the heater and the pressure of the exhaust from the noncon- (lensing turbine for controlling said valve gear.

4. In an apparatus of the character de scribed, the combination of a heater, a conduit for supplying liquid thereto to be heated, a conduit for supplying elastic fluid to the heater to heat the liquid, a valve means controlling the flow of elastic fluid through the last named conduit, means for moving said valve means toward the closed position when both the temperature of the liquid flowing from the heater and the pressure oi the elastic fluid supplied to the heater reach predetermined high values, and means for moving said valve means toward the open position when both the temperature of the liquid flowing from the heater and the pressure of the elastic fluid supplied to the heater reach predetermined low values.

5. In an apparatus of the character described, the combination of a heater, a con duit for supplying liquid thereto to be heated, a conduit supplying elastic fluid to the heated to heat the liquid, a valve means con trolling the flow of elastic fluid through the last named conduit, an electric motor operatively connected with the valve means for moving the same, an electric circuit for the motor which when closed operates the motor in a direction to open the valve means, a second electric circuit for the motor which when closed operates the motor in a direction to close said valve means, means for closing the tirst-named circuit when both the temperature of the liquid leaving the heater and the pressure of the elastic fluid supplied to the heater reach predetermined low values, and means for closing said second-named circuit when the temperature oi the liquid leaving the heater and the pressure of the elastic fluid supplied to the heater reach predetermined high values.

6. In an apparatus of the character described, the combination of a heater, means for supplying thereto a liquid to be heated, at discharge conduit connected with the heater through which heated liquid flows, a conduit connected with the heater through which heating elastic fluid is supplied to said heater. a temperature responsive device connected with the the discharge conduit of the heater, said device having a member which moves in response to temperature changes in the heated fluid, a pressure responsive device connected with the heating elastic fluid supply conduit, said device having a member which moves in response to pressure changes in the heating elastic fluid, and control means :for the heating elastic fluid connected with and jointly operated by the movable members of said temperature and pressure responsive devices, said control means operating to reduce the flow 0t heating elastic fluid when the ten'iperaturc and pressure simultaneousl v attain certain predetermined high limit values and to increase the flow of said elastic fluid when the temperature and pressure simultaneously attain certain predetermined low limit values.

7. The combination with a liquid heater having a discharge conduit through which a heated liquid flows, or" an elastic fluid turbine having an exhaust outlet conduit connected with said heater to supply thereto exhaust elastic fluid as a heating medium, a valve gear controlling the admission of clastic fluid to the turbine, an operating governor for the turbine controlling said valve gear, said governor being adjustable to effeet through the valve gear an increase and decrease in the flow oi elastic fluid to the turbine, an electric motor by which the governor is adjusted, an electrical circuit for the motor which, when closed, operates said motor in a direction to cause an increase in the flow of elastic fluid to the turbine, a second electrical circuit for the motor which when closed operates said motor in a direction to cause a decrease in the flow of elastic fluid to the turbine, means responsive to the pressure in the exhaust outlet conduit and to the temperature in the heater discharge conduit. tor closing the .tirst named circuit when said pressure and temperature both reach predetermined low values and for closing the se"- ond named circuit when said pressure and teu'iperature both reach certain predetermined high values.

In witness whereof, I have hereunto set my hand this 4th day of March 1924:.

ERNEST L. RICHARDSON.

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