CN108539881B - Turbo generator set device for providing multi-quality steam - Google Patents
Turbo generator set device for providing multi-quality steam Download PDFInfo
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- CN108539881B CN108539881B CN201810505483.9A CN201810505483A CN108539881B CN 108539881 B CN108539881 B CN 108539881B CN 201810505483 A CN201810505483 A CN 201810505483A CN 108539881 B CN108539881 B CN 108539881B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/25—Devices for sensing temperature, or actuated thereby
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
- H02K7/1807—Rotary generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/20—Structural association with auxiliary dynamo-electric machines, e.g. with electric starter motors or exciters
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- Engineering & Computer Science (AREA)
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- Microelectronics & Electronic Packaging (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
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Abstract
The invention discloses a turbo generator set device for providing multi-quality steam, which is characterized in that: the power generation device comprises a first turbine, a second turbine, a first gear box, a second gear box and a power generator, wherein the power generator is a double-end drive type turbine power generator, the first turbine is connected with the input end of the first gear box, the output end of the first gear box is connected with one end of the power generator, the second turbine is connected with the input end of the second gear box, and the output end of the second gear box is connected with the other end of the power generator. The invention replaces the traditional turbo generator set device that two sets of single steam extraction back pressure type steam turbines drive one generator to provide four different quality steam, realizes the novel device that two steam extraction back pressure type steam turbines jointly drive one generator to simultaneously provide four quality steam, has simple and compact structure, small occupied space of a factory building and reduces the construction cost of equipment and the factory building.
Description
Technical Field
The invention relates to a turbo generator set device, in particular to a turbo generator set device for providing multi-quality steam.
Background
At present, some large-scale chemical enterprises have the use requirements for steam with different qualities in the process production flow, for example, an enterprise has the process steam requirements of four different pressures of 4.0MPa, 2.5 MPa, 1.3 MPa and 0.35 MPa in the petrochemical refining process, and one set of turbo generator set device at home and abroad can only provide steam with two different pressure grades at the same time. Two approaches are generally employed to meet the above requirements: 1. four-quality steam is obtained by adopting two sets of steam turbine generator units, the system is complex, and the investment cost is high, as shown in figure 3; 2. two kinds of quality steam are obtained by adopting a set of steam turbine generator unit device, and the other two kinds of quality steam are obtained after the pressure of the first two kinds of high quality steam is reduced, so that serious energy waste is caused, and the steam turbine generator unit device is shown in fig. 4.
Disclosure of Invention
The invention aims to solve the technical problem of providing a steam turbine generator unit device for providing multi-quality steam, which has the advantages of simple system, low investment cost and high energy utilization rate.
In order to solve the technical problems, the invention adopts the following technical scheme:
a turbo generator set device for providing multi-quality steam, characterized in that: the power generation device comprises a first turbine, a second turbine, a first gear box, a second gear box and a power generator, wherein the power generator is a double-end drive type turbine power generator, the first turbine is connected with the input end of the first gear box, the output end of the first gear box is connected with one end of the power generator, the second turbine is connected with the input end of the second gear box, and the output end of the second gear box is connected with the other end of the power generator.
Further, the first turbine and the second turbine are both ultrahigh-pressure high-temperature high-speed turbines, the rotating speed is 5500rpm, and the speed is reduced to 3000rpm through a gear box.
Further, the double-end driving type steam turbine generator comprises a generator stator, a generator rotor, an end cover, a front bearing seat, a rear bearing seat and an exciter, wherein the generator stator is fixed on a foundation, the generator rotor is rotationally arranged in the generator stator, the end cover is fixed at two ends of the generator stator, the two ends of the generator rotor are rotationally arranged on the front bearing seat and the rear bearing seat through bearings, and the exciter is arranged at one end of the generator rotor.
Further, the generator stator comprises a machine base, an iron core and windings, wherein a partition plate, a support pipe and a ventilation pipe are arranged in the machine base, the interior of the machine base is divided into different wind areas, an air outlet cover is arranged on the lower side of the machine base, the iron core is fixed on the inner wall of the machine base, radial ventilation grooves are formed in the axial direction of the iron core, a plurality of sections of iron core tooth parts at the outermost ends of the end parts are arranged in a conical step shape, the two ends of the iron core are pressed with a non-magnetic steel pressing finger and a pressing plate to press the stator iron core, and the windings are arranged on the iron core.
Further, the winding is a three-phase, short-distance and lap winding and consists of an upper layer wire rod, a lower layer wire rod and wire loops with parallel end parts, wherein the wire rod strands are double polyester glass fiber paint-free sintered copper flat wires, and the strands adopt 360-degree Robel transposition.
Further, back wheels used for being connected with a gear box are arranged at the end parts of the two ends of the generator rotor, a high-strength non-magnetic forged steel guard ring is arranged at the end part of the generator rotor, one end of the guard ring is thermally sleeved at the end part of the rotor body and fixed by a ring key, and the other end of the guard ring is in thermal sleeve fit with the suspension type center ring.
Further, an air-steam cooler is arranged at the bottom of the generator stator.
Further, the rotating armature of the exciter is supplied with three-phase alternating current to a coaxially rotating diode rectifying device, the three-phase alternating current is rectified by the diode rectifying device and then supplied to a rotor of the steam turbine generator for excitation, excitation of a stator magnetic field of the exciter is provided by a static silicon controlled rectifier excitation device, and the silicon controlled rectifier excitation device is powered by a terminal voltage of the steam turbine generator and is regulated in proportion.
The exciter is characterized in that the exciter is of a rotary pivot structure, an armature iron core is formed by laminating silicon steel sheets, silicon steel sheet paint is coated on two sides of a punching sheet, an armature coil is a double-layer wave winding and is fixed in a groove by a slot wedge, the end part of the armature winding is bound by a weft-free belt, the whole armature is impregnated twice, an outgoing line of the armature coil is led to a rotary rectifying ring through a shaft surface, the outgoing line is bound by the weft-free belt, the stator iron core of the exciter is formed by laminating magnetic pole punching sheets punched by steel plates, a circular damping strip is arranged on a magnetic pole shoe, damping rings are arranged at two ends of the magnetic pole iron core to form a damping cage, the magnetic pole coil is wound by a high-strength polyester enameled wire, the glass fiber tape is covered outside the magnetic pole iron core, the magnetic pole coil is impregnated twice, the magnetic pole coil is fixed on a base by bolts, the stator base is fixed on the base by bolts and a locating pin, and the stator base is of an upper half structure and a lower half structure.
Further, the rotary rectifying ring consists of a single rotary disk, 18 rotary rectifying elements and 18 overcurrent protection elements are arranged on the rotary disk, the rotary rectifying elements and the overcurrent protection elements are fixed on the rotary disk through rectifying blocks, the rectifying blocks are insulated from the rotary disk, the rotary disk is fixed on a rotary shaft through bolts, current after rectification is connected with a conducting rod in a central hole of the shaft through a conducting screw, and then the current is supplied to a rotor coil of the generator for excitation through an exciter conducting rod and a generator conducting rod.
Compared with the prior art, the invention has the following advantages and effects:
1. the traditional turbo generator set device for driving one generator to provide four types of steam with different quality by replacing two sets of single steam extraction back pressure type turbines is realized, the two steam extraction back pressure type turbines jointly drive one generator to simultaneously provide the novel device of four types of steam, the structure is simple and compact, the occupied space of a factory building is small, and the construction cost of equipment and the factory building is reduced;
2. the double-end driving type turbo generator is shared, the capacity of the generator is increased, and the mechanical energy conversion efficiency is improved by 1%. The same set of heat return system is adopted, so that the equipment investment cost is saved, and the circulating heat efficiency of the system is improved;
3. the direct decompression of high-quality steam to low-quality steam is avoided, the energy utilization rate is improved, and the economic benefit of users is increased;
4. economic benefit: the 10000KW unit can reduce 20% of energy loss caused by decompression, the high-capacity generator can reduce 1% of mechanical loss, the 2100KW generating capacity of the unit can be increased, the unit operates for 8000 hours per year, electricity price is 0.75 yuan, and annual income is increased by about 1260 ten thousand yuan.
Drawings
Fig. 1 is a schematic diagram of a turbo generator set apparatus for providing multi-quality steam according to the present invention.
Fig. 2 is a schematic diagram of a generator of a turbo generator set for providing multi-quality steam according to the present invention.
Fig. 3 is a schematic diagram of a prior art steam using two turbo-generator sets to achieve four qualities.
Fig. 4 is a schematic diagram of four quality vapors obtained by a set of turbo generator set apparatus according to the prior art.
Fig. 5 is a schematic diagram of the brushless excitation system of the present invention.
Fig. 6 is a schematic view of a rotary rectifying ring junction of the present invention.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and not limited to the following examples.
As shown in fig. 1 and 2, a turbo generator set device for providing multi-quality steam according to the present invention includes a first turbine 1, a second turbine 2, a first gear box 3, a second gear box 4, and a generator 5, where the generator 5 is a double-end driven turbo generator, the first turbine 1 is connected to an input end of the first gear box 3, an output end of the first gear box 3 is connected to one end of the generator 5, the second turbine 2 is connected to an input end of the second gear box 4, and an output end of the second gear box 4 is connected to the other end of the generator 5.
The first steam turbine 1 and the second steam turbine 2 are ultrahigh-pressure high-temperature high-speed steam turbines, the rotating speed is 5500rpm, the rotating speed is reduced to 3000rpm through a gear box, the rotating speed is connected to two ends of a double-end driving type steam turbine generator through a film type coupling, the generator is driven to generate electricity, and meanwhile, four kinds of industrial process steam with different qualities are provided, so that the cogeneration is realized. The two turbines share the same set of steam-water heat recovery system. Before delivery, the steam turbine is assembled in a factory, is installed on the same pedestal with the gear box, is delivered to a user integrally, and is directly connected with the steam turbine generator.
The double-end driving type steam turbine generator comprises a generator stator 6, a generator rotor 7, end covers 8, a front bearing seat 9, a rear bearing seat 10 and an exciter 11, wherein the generator stator 6 is fixed on a foundation, the generator rotor 7 is rotatably arranged in the generator stator 6, the end covers 8 are fixed at two ends of the generator stator 6, two ends of the generator rotor 7 are rotatably arranged on the front bearing seat 9 and the rear bearing seat 10 through bearings, and the exciter 11 is arranged at one end of the generator rotor 7.
The generator stator 6 comprises a base 12, an iron core 13 and windings 14, wherein a partition board, a support pipe and a ventilation pipe are arranged in the base 12 to divide the interior of the base into different wind areas, the base is an integral component formed by welding high-quality steel plates, and the good rigidity of the base enables the base to avoid resonance around 100 Hz. The lower side of the machine base 12 is provided with an air outlet cover 15, and the feet combined with the foundation are positioned at two sides of the machine base, and are provided with operation holes so that the foot bolts are combined with the foundation in the machine base. The iron core 13 is fixed on the inner wall of the machine base 12, the iron core 13 is provided with radial ventilation grooves along the axial direction, a plurality of sections of iron core teeth at the outermost end of the end part are arranged into a conical ladder shape, the two ends of the iron core 13 are pressed by non-magnetic steel pressing fingers and pressing plates to tightly press the stator iron core, and the winding 14 is arranged on the iron core 13. The stator core is formed by laminating low-loss cold-rolled non-oriented silicon steel segments after insulation, and the core is provided with radial ventilation grooves along the axial direction. In order to reduce the additional loss of the end part and prevent local overheating, the teeth parts of a plurality of sections of iron cores at the outermost end of the end part are arranged into a conical ladder shape, and the two ends of the iron cores are pressed tightly with a non-magnetic steel pressing finger and a pressing plate, and a Pt100 type resistance temperature measuring element is embedded in the teeth part and the yoke part at the proper position of the air outlet section of the iron cores and used for monitoring the temperature of the iron cores.
The stator winding is a three-phase, short-distance and lap winding and consists of upper and lower layers of bars and wire loops with parallel end parts, the bar strands are double polyester glass fiber paint-free sintered copper flat wires, and 360-degree Roebel transposition is adopted for the strands to reduce circulation loss generated between the strands by leakage magnetic flux of the end parts and the groove parts. The stator winding adopts an F-level thin insulation system with excellent performance, and each wire rod is subjected to corona prevention treatment at the slot part and the slot opening at the end part. The fixing structure of the stator winding is suitable for peak regulation working mode, the supporting main body of the end winding is a high-strength radial insulating bracket and a circumferential glass fiber reinforced plastic ring which are combined on an end pressing plate, and the upper and lower layer wire rods are bound to the supporting structure by adopting polyester glass ropes impregnated with epoxy resin. In a general motor, a very small air-steam gap is always formed between a slot bar and a slot wall on the side surface, and the gap seriously hinders heat dissipation of a winding due to a surface cooling mode, so that a special filling structure is designed. A Pt100 type resistance temperature measuring element is arranged between the upper layer bar and the lower layer bar in the groove and used for monitoring the temperature of the winding.
The two end parts of the generator rotor 7 are provided with back wheels 16 connected with the gear boxes, the '2+1' form of connection of the front turbine and the rear turbine with the intermediate generator is realized, and the rotating shaft is a high-permeability alloy steel integral forging. The method is subjected to strict ultrasonic flaw detection and mechanical property inspection to avoid any possible defects. The rotor winding is made of cold-drawn silver-containing copper bars, two rows of radial elliptical holes uniformly distributed along the axial direction are punched in the inner part of the rotor winding to form an inner cold air channel, each turn of copper bar comprises two strands, each strand of end part is milled with a concave groove, the grooved faces are combined to form an air core conductor, the outlet of the air core conductor is communicated with the radial air holes in the grooves, a part of cold air enters the hollow end turn flow direction body through the end part air inlet holes, and then is discharged into the steam gap from the radial air holes in the groove part. The other part of steam flows into the rotor auxiliary groove and then is discharged into the steam gap from the radial wind hole of the groove part. The rotor winding adopts an F-level insulation system, the insulation between the winding and the shaft is molded by a high-strength composite material, and the strip-shaped inter-turn insulation filler strips are adhered and fixed on the copper bars. The copper bars at the top are separated from the slot wedges by thicker insulating filler strips, so that the windings are ensured to have enough creepage distance; the slot parts of the rotor coils are fixed by aluminum alloy slot wedges.
The end part of the generator rotor 7 is provided with a high-strength non-magnetic forged steel guard ring 17, one end of the guard ring 17 is thermally sleeved at the end part of the rotor body and fixed by a ring key under the action of centrifugal force, and the other end of the guard ring 17 is in thermal sleeve fit with a suspension type center ring 18. The center ring is provided with a spring which allows the winding to moderately stretch and retract.
The two ends of the machine base are positioned above the basic surface and are covered by the end cover 8 of the generator. Each end is divided into two parts, namely a large end cover and a small end cover, has the characteristics of flame retardance and electric corrosion resistance, and provides good protection for the end winding. The end cover 8 is split left and right, so that good strength and rigidity are ensured. The cast aluminum air guide ring is arranged on the inner side of the large end cover, and a fire extinguishing water pipe is also arranged in the end cover. The lower end part protective cover below the foundation surface is also a glass fiber reinforced plastic piece. An air-steam cooler is arranged at the bottom of the generator stator. The air cooler takes away the loss in the generator through the heat exchange of water and air. The generator has four groups of coolers which are transversely arranged in a closed cell at the bottom of the generator. Each group of coolers is provided with independent waterways, so that the maintenance is convenient.
The rotating armature of the exciter 11 is supplied with three-phase alternating current to a coaxially rotating diode rectifying device, and is rectified by the diode rectifying device and then supplied to the rotor of the steam turbine generator for excitation, the excitation of the stator magnetic field of the exciter is provided by a static silicon controlled rectifier excitation device, and the silicon controlled rectifier excitation device is powered by the voltage of the machine end of the steam turbine generator and is regulated in proportion. A schematic diagram of the brushless excitation system is shown in fig. 5. The double-end driving type steam turbine generator is in a coaxial alternating current brushless excitation mode, the excitation system rectifies output current of the coaxial rotating alternating current exciter and supplies the rectified output current to the excitation winding of the generator, and compared with a traditional direct current system, the double-end driving type steam turbine generator is mainly different in that direct current excitation is changed into alternating current excitation, so that the problem of reversing spark is avoided, and the double-end driving type steam turbine generator is suitable for a production environment with high explosion-proof requirements. The exciter is in the form of a rotary pivot and rotates coaxially with the steam turbine generator.
The exciter is of a rotary pivot structure, the armature core is formed by laminating silicon steel sheets, silicon steel sheet paint is coated on two sides of a punching sheet, an armature coil is a double-layer wave winding, slot wedges made of 3240 are fixed in slots, the end parts of the armature winding are bound by weft-free belts, the whole armature is impregnated with paint twice, an outgoing line of the armature coil is led to a rotary rectifying ring through the surface of a shaft, and the outgoing line of the armature is bound by the weft-free belts. The stator core of the exciter is formed by laminating magnetic pole punching sheets punched by Q235-A steel plates, round damping strips are arranged on magnetic pole shoes, damping rings are arranged at two ends of the magnetic pole shoes to form a damping cage, and therefore induced voltage in diodes during rectifying reaction and rectification of the exciter is reduced. The magnetic pole coil is wound by high-strength polyester enameled wire, and is covered with glass ribbon and impregnated with lacquer twice. The magnetic pole coil is fixed on the machine base through the magnetic pole iron core by bolts, the stator machine base is fixed on the underframe by bolts and positioning pins, and the stator machine base is of an upper half structure and a lower half structure.
The rotating rectifying ring consists of a single rotating disc, and is provided with 18 rotating rectifying elements and 18 overcurrent protection elements. The rotary rectifying element and the overcurrent protection element are fixed on the rotary disk through the rectifying block, the rectifying block is insulated from the rotary disk, the rotary disk is fixed on the rotary shaft through bolts, rectified current is connected with a conductive rod in a central hole of the shaft through a conductive screw, and the rectified current is supplied to the rotor coil of the generator for excitation through an exciter conductive rod and a generator conductive rod. The rotary disk is provided with holes for ventilation, and the rotary rectifying ring is used as a radiating air duct of the rotary rectifying element, and the wiring schematic diagram of the rotary rectifying ring is shown in fig. 6.
The ventilation of the exciter, the air enters from the rear end of the exciter, is pressurized by a centrifugal fan on a shaft, is discharged from the front end of the exciter after cooling the rectifying ring, stator and rotor of the exciter, is cooled by a cooler at the top of the exciter, and returns to the rear end of the exciter for the second circulation. The exciter is provided with an electric brush assembly for measuring exciting voltage of a generator rotor, 1-point and 2-point grounding of the rotor and measuring points for protecting the rotor from overvoltage.
The working principle of the invention is as follows: the rated power of turbines at the two ends of the generator is P1 and P2 (P1 > P2), and the rated power of the generator is P. After the steam turbine P1 enters the steam, the generator and the steam turbine P2 are dragged to reach the rated rotation speed of 3000r/min, the generator is in no-load sequence adjustment, and after the load is added and the grid is connected, the excitation system is automatically adjusted, and the power of the generator gradually reaches P1; at this time, the steam turbine P2 enters the steam, and gradually reaches the rated power P2 along with the increase of the power, and the excitation system is automatically adjusted. At this time, the power P of the generator is the sum of the powers of the turbines at the two ends, i.e., p=p1+p2, and the turbine generator system reaches the rated working condition.
Compared with the prior art, the invention has the following advantages and effects:
1. the traditional turbo generator set device for driving one generator to provide four types of steam with different quality by replacing two sets of single steam extraction back pressure type turbines is realized, the two steam extraction back pressure type turbines jointly drive one generator to simultaneously provide the novel device of four types of steam, the structure is simple and compact, the occupied space of a factory building is small, and the construction cost of equipment and the factory building is reduced;
2. the double-end driving type turbo generator is shared, the capacity of the generator is increased, and the mechanical energy conversion efficiency is improved by 1%. The same set of heat return system is adopted, so that the equipment investment cost is saved, and the circulating heat efficiency of the system is improved;
3. the direct decompression of high-quality steam to low-quality steam is avoided, the energy utilization rate is improved, and the economic benefit of users is increased;
4. economic benefit: the 10000KW unit can reduce 20% of energy loss caused by decompression, the high-capacity generator can reduce 1% of mechanical loss, the 2100KW generating capacity of the unit can be increased, the unit operates for 8000 hours per year, electricity price is 0.75 yuan, and annual income is increased by about 1260 ten thousand yuan.
The foregoing description of the invention is merely exemplary of the invention. Various modifications or additions to the described embodiments may be made by those skilled in the art to which the invention pertains or in a similar manner, without departing from the spirit of the invention or beyond the scope of the invention as defined in the appended claims.
Claims (10)
1. A turbo generator set device for providing multi-quality steam, characterized in that: the system comprises a first turbine, a second turbine, a first gear box, a second gear box and a generator, wherein the generator is a double-end drive type turbine generator, the first turbine is connected with the input end of the first gear box, the output end of the first gear box is connected with one end of the generator, the second turbine is connected with the input end of the second gear box, and the output end of the second gear box is connected with the other end of the generator; the rated power of the first turbine is P1, the rated power of the second turbine is P2, P1> P2 is set, and the rated power of the generator is P; after the first turbine enters the steam, the generator and the second turbine are dragged to reach rated rotation speed, the generator is in no-load sequence adjustment, and after loading grid connection, the excitation system is automatically adjusted, and the power of the generator gradually reaches P1; at this time, the second turbine enters the steam, and gradually reaches the rated power P2 along with the increase of the power, and the excitation system is automatically adjusted; at this time, the power P of the generator is the sum of the powers of the turbines at two ends, i.e., p=p1+p2, the turbine generator system reaches the rated working condition, the main steam is simultaneously input into the first turbine and the second turbine, the middle section of the first turbine is pumped to obtain the steam with the first pressure, the first turbine is exhausted to obtain the steam with the second pressure, the middle section of the second turbine is pumped to obtain the steam with the third pressure, and the second turbine is exhausted to obtain the steam with the fourth pressure, so that four kinds of steam with different quality can be simultaneously provided.
2. A turbo generator set for providing multi-quality steam according to claim 1, wherein: the first turbine and the second turbine are ultra-high pressure high temperature high speed turbines, the rotating speed is 5500rpm, and the speed is reduced to 3000rpm through a gear box.
3. A turbo generator set for providing multi-quality steam according to claim 1, wherein: the double-end driving type steam turbine generator comprises a generator stator, a generator rotor, end covers, a front bearing seat, a rear bearing seat and an exciter, wherein the generator stator is fixed on a foundation, the generator rotor is rotationally arranged in the generator stator, the end covers are fixed at two ends of the generator stator, the two ends of the generator rotor are rotationally arranged on the front bearing seat and the rear bearing seat through bearings, and the exciter is arranged at one end of the generator rotor.
4. A turbo generator set for providing steam of multiple qualities according to claim 3, wherein: the generator stator comprises a machine base, an iron core and windings, wherein a partition plate, a supporting pipe and a ventilation pipe are arranged in the machine base to divide the interior of the machine base into different wind areas, an air outlet cover is arranged on the lower side of the machine base, the iron core is fixed on the inner wall of the machine base, radial ventilation grooves are formed in the axial direction of the iron core, a plurality of sections of iron core tooth parts at the outermost ends of the end parts are arranged to be in a conical ladder shape, two ends of the iron core are pressed by a non-magnetic steel pressing finger and a pressing plate to press the stator iron core, and the windings are arranged on the iron core.
5. A turbo generator set for providing multi-quality steam according to claim 4, wherein: the winding is a three-phase, short-distance and lap winding and consists of an upper layer wire rod, a lower layer wire rod and wire loops with parallel end parts, wherein the wire rod strands are double polyester glass fiber paint-free sintered copper flat wires, and the strands adopt 360-degree Robel transposition.
6. A turbo generator set for providing steam of multiple qualities according to claim 3, wherein: the generator rotor is characterized in that back wheels used for being connected with the gear box are arranged at the end parts of the two ends of the generator rotor, a high-strength non-magnetic forged steel guard ring is arranged at the end part of the generator rotor, one end of the guard ring is thermally sleeved at the end part of the rotor body and fixed through a ring key, and the other end of the guard ring is in thermal sleeve fit with the suspension type center ring.
7. A turbo generator set for providing steam of multiple qualities according to claim 3, wherein: an air cooler is arranged at the bottom of the generator stator.
8. A turbo generator set for providing steam of multiple qualities according to claim 3, wherein: the rotary armature of the exciter is supplied with three-phase alternating current to a coaxially rotating diode rectifying device, the three-phase alternating current is rectified by the diode rectifying device and then supplied to a rotor of the steam turbine generator for excitation, excitation of a stator magnetic field of the exciter is provided by a static silicon controlled rectifier excitation device, and the silicon controlled rectifier excitation device is powered by a terminal voltage of the steam turbine generator and is regulated in proportion.
9. A turbo generator set for providing multi-quality steam according to claim 8, wherein: the exciter is of a pivot structure, an armature core is formed by laminating silicon steel sheets, silicon steel sheet paint is coated on two sides of a punching sheet, an armature coil is a double-layer wave winding and is fixed in a groove by using a slot wedge, the end part of the armature winding is bound by using a weft-free belt, the whole armature is impregnated with paint twice, an outgoing line of the armature coil is led to a rotary rectifying ring through the surface of a shaft, the outgoing line is bound by using the weft-free belt, the stator core of the exciter is formed by laminating magnetic pole punching sheets punched by steel plates, a circular damping strip is arranged on a magnetic pole shoe, damping cages are formed by the damping rings at two ends of the pole core, the magnetic pole coil is wound by using a high-strength polyester paint, a glass ribbon is wrapped, the impregnated paint is twice, the magnetic pole coil is fixed on a base by using bolts and a locating pin, and the stator base is of an upper half structure and a lower half structure.
10. A turbo generator set for providing multi-quality steam according to claim 9, wherein: the rotary rectifying ring consists of a single rotary disk, 18 rotary rectifying elements and 18 overcurrent protection elements are arranged on the rotary disk, the rotary rectifying elements and the overcurrent protection elements are fixed on the rotary disk through rectifying blocks, the rectifying blocks are insulated from the rotary disk, the rotary disk is fixed on a rotary shaft through bolts, and rectified current is connected with a conductive rod in a central hole of the shaft through a conductive screw and is supplied to the rotor coil of the generator for excitation through an exciter conductive rod and a generator conductive rod.
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| CN108757058A (en) * | 2018-08-08 | 2018-11-06 | 中国长江动力集团有限公司 | Generating set and its electricity-generating method |
| CN112398275A (en) * | 2020-11-12 | 2021-02-23 | 中国长江动力集团有限公司 | Novel double-end driving generator |
| CN114142652B (en) * | 2021-11-15 | 2023-02-28 | 杭州爱纬斯电子有限公司 | Energy-saving direct current motor |
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