CN103397916A - Blower system speed-governed by power frequency generator and driven by back-pressure small turbine and method - Google Patents
Blower system speed-governed by power frequency generator and driven by back-pressure small turbine and method Download PDFInfo
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- CN103397916A CN103397916A CN2013103525929A CN201310352592A CN103397916A CN 103397916 A CN103397916 A CN 103397916A CN 2013103525929 A CN2013103525929 A CN 2013103525929A CN 201310352592 A CN201310352592 A CN 201310352592A CN 103397916 A CN103397916 A CN 103397916A
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Abstract
The invention discloses a blower system speed-governed by a power frequency generator and driven by a back-pressure small turbine and a method. The system comprises a back-pressure small turbine, a blower, a power frequency generator and a speed governing gearbox which are in coaxial connection, wherein the output terminal of the speed governing gearbox is connected with the input terminal of the power frequency generator to drive the power frequency generator to rotate; the output of the power frequency generator is controlled to control the rotational speed of the back-pressure small turbine so as to control the rotational speed of the blower. The system greatly reduces admission throttling loss of the small turbine to improve the operation efficiency and gives the power capacity of the small turbine into full play to increase the operation gain. The invention also discloses a steam generator set and a method for regulating the rotational speed of a blower.
Description
Technical field
The present invention relates to the field of energy-saving technology of power generation system, relate to particularly a kind of back pressure type small turbine drive blower fan system and method for industrial frequency generator speed governing.
Background technique
In large capacity high parameter steam turbine power generation factory, usually dispose as blower fans such as steam-operating blower fans, these blower fans drive by steam turbine as little in back pressure type, the pressure of the working medium such as air, flue gas or combustion gas can be improved, and supply with the subsequent technique system.
Therefore usually due to the needs of generator set load variations, respective change usually occurs in exerting oneself of blower fan, and the variation by the rotating speed to blower fan meets the needs that unit load changes, and the rotating speed of blower fan to be rotating speed by the little steam turbine of coaxial connection determine.
In order to meet the needs that summer, generator set was completely sent out for a long time, therefore the nominal output of little steam turbine is usually large than the nominal output of blower fan, and the nominal output of blower fan is exerted oneself greatly than generator set rated load is needed usually, so the nominal output of little steam turbine has larger allowance, generally more than 50%.In present small turbine drive blower fan system, little steam turbine disposes the admission modulating valve,, by the aperture of modulating valve, can control the rotating speed of little steam turbine, thereby meets the needs of generator set load variations.Yet this configuration is usually less due to the aperture of little steam turbine admission modulating valve under most working time, therefore easily causes larger restriction loss.
In addition, due to the load of generator set with electrical network demand every day all in continuous variation, it is low that load has height to have, therefore when low-load, the aperture of the admission modulating valve of little steam turbine can be less, thereby the restriction loss that causes is larger.And, because the ability of the acting of little steam turbine can not be given full play to, therefore also there is relatively large economic loss.
Therefore, how for the throttle grverning problem of existing back pressure type small turbine drive blower fan system, develop a kind of loss that can effectively reduce little steam turbine admission throttling, can take full advantage of again driving blower fan system that little steam turbine exerts oneself and be present steam turbine power generation factory in the energy-saving field problem demanding prompt solution.
Summary of the invention
The object of the present invention is to provide a kind of restriction loss little, the exert oneself back pressure type small turbine drive blower fan system of the high industrial frequency generator speed governing of utilization ratio of little steam turbine.
First aspect present invention provides a kind of back pressure type small turbine drive blower fan system of industrial frequency generator speed governing, and described system comprises the little steam turbine of back pressure type, blower fan, industrial frequency generator and timing gear roller box, wherein,
The little steam turbine of described back pressure type, blower fan, industrial frequency generator and the timing gear roller box is coaxial is connected;
The output terminal of described timing gear roller box is connected to drive described industrial frequency generator with the input end of described industrial frequency generator and rotates; And
By controlling the output of described industrial frequency generator, thereby control the rotating speed of the little steam turbine of described back pressure type, thereby control the rotating speed of described blower fan.
In another preference, the little steam turbine of described back pressure type also comprises the outlet of drawing gas.
In another preference, the described outlet of drawing gas is connected with high temperature heat source heater or heat exchanger by extraction line.
In another preference, described extraction line comprises n level extraction line, described n=1,2,3,4,5 or 6.
In another preference, the output terminal of described industrial frequency generator is connected with transformer.
In another preference, the little steam turbine of described back pressure type is provided with the admission pipeline, and described admission pipeline is provided with modulating valve.
In another preference, the little steam turbine of described back pressure type is provided with blow-off line, and described blow-off line is connected with low-temperature heat source heater or heat exchanger.
In another preference, the high aperture of the long-term maintenance of the aperture of described modulating valve, the aperture scope is 70%-100%.
In another preference, described blower fan is connected with the axle head of the little steam turbine of described back pressure type both sides respectively with industrial frequency generator, and described timing gear roller box is between the little steam turbine of described back pressure type and industrial frequency generator.
In another preference, the input end of described timing gear roller box is connected with the axle head of a side of the little steam turbine of described back pressure type, and the input end of described blower fan is connected with the axle head of the opposite side of the little steam turbine of described back pressure type.
In another preference, described blower fan and industrial frequency generator are connected in the same axle head of the little steam turbine of described back pressure type, and described timing gear roller box is between described blower fan and industrial frequency generator.
In another preference, the input end of described timing gear roller box is connected with the output terminal of described blower fan, and the input end of described blower fan is connected with the axle head of the little steam turbine of described back pressure type.
In another preference, be provided with the constant-speed ratio gear-box between the little steam turbine of described back pressure type and blower fan.
In another preference, described blower fan comprises: medium is the blower fan of air or flue gas, compressor, the gas turbine that medium is air or combustion gas.
Second aspect present invention provides a kind of steam electric power unit, and described generator set disposes the described system of first aspect.
Third aspect present invention provides a kind of method of regulating rotation speed of fan in back pressure type small turbine drive blower fan system, described system comprises the little steam turbine of back pressure type and blower fan, set up industrial frequency generator in described system, by regulating the output of described industrial frequency generator, thereby control the rotating speed of the little steam turbine of described back pressure type, thereby control the rotating speed of described blower fan.
In should be understood that within the scope of the present invention, above-mentioned each technical characteristics of the present invention and can making up mutually between specifically described each technical characteristics in below (eg embodiment), thus form new or preferred technological scheme.As space is limited, tire out and state no longer one by one at this.
Description of drawings
Fig. 1 is existing back pressure type small turbine drive blower fan system schematic diagram.
Fig. 2 is the system schematic of the embodiment of the present invention 1.
Fig. 3 is the system schematic of the embodiment of the present invention 2.
Embodiment
The inventor is through deeply research widely, discovery by with the coaxial industrial frequency generator that is connected of the little steam turbine of back pressure type, not only can be by controlling the mode of exerting oneself of industrial frequency generator, partly or entirely replace the modulating valve mode, to control the rotating speed of little steam turbine, thereby control the rotating speed of blower fan, and can utilize industrial frequency generator to generate electricity, thereby take full advantage of exerting oneself of little steam turbine.The aperture of the modulating valve of the little steam turbine of the present invention can keep high aperture (the aperture scope is 70%-100%) for a long time, has greatly reduced the loss that throttling causes, and has taken full advantage of exerting oneself of little steam turbine, make little steam turbine operational efficiency raising 8%-20%.Completed on this basis the present invention.
As used herein, " industrial frequency generator " refers to that the electricity that sends while normally moving is the generator of fixed frequency, and common is 50Hz or 60Hz.
As used herein, " the little steam turbine of back pressure type ", " back pressure type small turbine ", " little steam turbine " and " small turbine " are used interchangeably, and refer to that steam discharge is called the little steam turbine of back pressure type to the steam turbine higher than atmospheric heat exchanger or heat supply network.
As used herein, " coaxial being connected " refers to that each equipment connection is on same rotation axis system.
The back pressure type small turbine drive blower fan system of industrial frequency generator speed governing
The back pressure type small turbine drive blower fan system of industrial frequency generator speed governing of the present invention is in large capacity high parameter steam turbine power generation factory, what generator set configured is used for after the raising of the pressure of the working medium such as air, flue gas or combustion gas, one of indispensable system of supply subsequent technique system institute.
System of the present invention comprises: the little steam turbine of back pressure type, blower fan, industrial frequency generator and timing gear roller box, wherein, the little steam turbine of back pressure type is provided with admission pipeline, blow-off line and modulating valve, the steam of admission pipeline carrys out the high pressure steam of self generating sets thermodynamic system, blow-off line is connected with low-temperature heat source (low-pressure steam source) heater or heat exchanger, modulating valve is arranged on the admission pipeline, is used for regulating the logical vapour amount of high pressure steam;
Blower fan and coaxial being connected of the little steam turbine of back pressure type, namely blower fan is connected on the same rotation axis system of the little steam turbine of back pressure type.Blower fan of the present invention comprises that medium is that the blower fan of air, compressor, working medium that medium is air are that other blower fan of flue gas, medium are the compressor of combustion gas or gas turbine etc.
The timing gear roller box is used for changing rotating speed and is converted to fixed rotating speed, the optional pattern with clutch function of timing gear roller box.The output terminal of timing gear roller box is connected to drive industrial frequency generator with the input end of industrial frequency generator and rotates.
Industrial frequency generator is connected on the same rotation axis system of the little steam turbine of back pressure type together with blower fan.Industrial frequency generator can be connected with the axle head of the little steam turbine of back pressure type both sides respectively with blower fan, also can be connected in the same axle head of the little steam turbine of back pressure type.
When industrial frequency generator and blower fan laid respectively at the axle head of the little steam turbine of back pressure type both sides, the timing gear roller box between the little steam turbine of back pressure type and industrial frequency generator, and was connected with industrial frequency generator is coaxial with the little steam turbine of back pressure type.And the input end of timing gear roller box is connected with the axle head of a side of the little steam turbine of back pressure type, and the input end of blower fan is connected with the axle head of the opposite side of the little steam turbine of back pressure type.
When industrial frequency generator and blower fan were positioned at the same axle head of the little steam turbine of back pressure type, the timing gear roller box was arranged between blower fan and industrial frequency generator, and with blower fan and industrial frequency generator are coaxial, is connected.And the input end of timing gear roller box is connected with the output terminal of blower fan, and the input end of blower fan is connected with the axle head of the little steam turbine of back pressure type.
In system of the present invention, can regulate by the timing gear roller box according to the rotating speed that blower fan changes, be converted into the power frequency rotating speed of 50Hz or 60Hz, rotate thereby drive industrial frequency generator, the Partial Power of the little steam turbine of back pressure type is output as the power frequency electricity.
In system of the present invention, the little steam turbine of back pressure type also can comprise the outlet of drawing gas, and the outlet of drawing gas is connected with high temperature heat source (high-pressure steam source) heater or heat exchanger by extraction line.The little steam turbine of back pressure type can be as required, configuration one-level extraction line, secondary extraction line or the above extraction line of secondary (as three grades of extraction lines, level Four extraction line etc.).
The little steam turbine of the back pressure type of system of the present invention, blower fan, industrial frequency generator and timing gear roller box are coaxial being connected.When the rotating speed ratio of blower fan and the little steam turbine of back pressure type is larger, can on the rotatingshaft between the little steam turbine of back pressure type and blower fan, the constant-speed ratio gear-box be set,, to regulate both rotating speed ratio, meet the needs of generator set load variations.
because back pressure type small turbine drive blower fan system of the present invention is regulated the rotating speed of blower fan by controlling exerting oneself of industrial frequency generator, to meet the needs of generator set load variations, therefore, within most working time of the whole year, the aperture of the modulating valve of the little steam turbine of back pressure type can keep high aperture (the aperture scope is at 70%-100%) for a long time, even when the unit load step-down, can be by the variation of rotation speed of fan, take full advantage of exerting oneself of the little steam turbine of back pressure type, generate electricity by industrial frequency generator, not only significantly reduced restriction loss, and improved the operational efficiency of the little steam turbine of back pressure type, improve the sale of electricity income of power plant.
The present invention also comprises the steam electric power unit of the back pressure type small turbine drive blower fan system that disposes the industrial frequency generator speed governing.
System of the present invention both can be by rotation speed of fan adjusting to meet the needs of generator set load variations, also can generate electricity to improve by industrial frequency generator the sale of electricity income of power plant, the variable-frequency electric that industrial frequency generator sends can be supplied with in factory or factory's external power grid, if between the electricity that industrial frequency generator sends and electrical network, voltage is different, can, by transformer is set, the electricity transformation be arrived the voltage that mates with electrical network.
In the back pressure type small turbine drive blower fan system that existing steam electric power unit configures, annual most of working times, particularly during the unit low-load, small turbine is exerted oneself and is all underused.The needs of for example in order to meet unit, completely sending out summer all the year round, the small turbine that 1 1000MW steam electric power unit is configured usually 2 50% capacity drives blower fan system.The declared working condition power demand of blower fan is about 6000kW, and supporting small turbine maximum output is about 10000kW, and every unit small turbine allowance of exerting oneself is (10000-6000) x2=8000kW.Therefore the small turbine of every unit does not on average utilize power for more than 8000kW, and there is very large problem in this allowance configuration.
In addition, because little steam turbine needs throttling, reduction is exerted oneself, and with blower fan (as blower fan) power demand coupling, therefore the control valve opening of little steam turbine is less, and common aperture is below 50%.There is obvious restriction loss.Affect little steam turbine operational efficiency more than 8%.
Compared with prior art, the present invention has following major advantage:
(1) with the common aperture of the little steam turbine regulating valve of back pressure type in present system from being increased to 70%-100% below 50%, and can keep for a long time high aperture level, significantly reduced little steam turbine because of with the loss that throttling causes that is complementary of driving arrangement power demand.
(2) operational efficiency of the little steam turbine of back pressure type of the present invention can improve 8%-20%, saves the mark coal 1000MW unit year more than 4000 tons for every, significantly reduces operating cost, and reaches the comprehensive benefit that reduces pollutant emission.
(3) system of the present invention takes full advantage of the acting ability of little steam turbine, by industrial frequency generator, generates electricity, and every 1000MW unit can externally be powered 6,000 ten thousand kilowatts every year more, and the direct economy income is more than 12,000,000 yuan.
The above-mentioned feature that the present invention mentions, or the feature that embodiment mentions can combination in any.All features that this case specification discloses can with any composition forms and use, each feature that discloses in specification, the alternative characteristics that can anyly be provided identical, impartial or similar purpose replaces.Therefore except special instruction is arranged, the feature that discloses is only the general example of equalization or similar features.
, below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments only are not used in and limit the scope of the invention for explanation the present invention.The experimental technique of unreceipted actual conditions in the following example, usually according to normal condition or the condition of according to manufacturer, advising.
Unless otherwise defined, all specialties of using in literary composition are identical with the meaning that scientific words and one skilled in the art are familiar with.In addition, any method similar or impartial to described content and material all can be applicable in the inventive method.The use that better implementation methods described in literary composition and material only present a demonstration.
as shown in Figure 2, the back pressure type small turbine drive blower fan system of the industrial frequency generator speed governing of the present embodiment comprises the little steam turbine 1 of back pressure type, blower fan 2, industrial frequency generator 3 and timing gear roller box 4, wherein, the little steam turbine 1 of back pressure type is provided with admission pipeline 11, blow-off line 12, modulating valve 13 and extraction line 14, the steam of admission pipeline 11 carrys out the high pressure steam of self generating sets thermodynamic system, blow-off line 12 is connected with low-temperature heat source (low-pressure steam source) heater or heat exchanger (not marking in figure), modulating valve 13 is arranged on admission pipeline 11, be used for regulating the logical vapour amount of high pressure steam, in the present embodiment, the long-term high aperture (the aperture scope is 70%-100%) that keeps of the aperture of modulating valve 13.Extraction line 14 is connected with high temperature heat source (high-pressure steam source) heater or heat exchanger (not marking in figure).
The little steam turbine of back pressure type also comprises the outlet (not shown) of drawing gas, and the outlet of drawing gas is connected with high temperature heat source (high-pressure steam source) heater or heat exchanger by extraction line 14.The little steam turbine of back pressure type can be as required, configuration one-level extraction line, secondary extraction line or the above extraction line of secondary (as three grades of extraction lines, level Four extraction line etc.).
The System Working Principle of the present embodiment is as follows:
When little steam turbine normally moved, little steam turbine regulating valve kept high aperture (the aperture scope is 70%-100%).High pressure steam enters little steam turbine by the admission pipeline, and the low pressure steam after acting is discharged to the hot users such as low-temperature heat source (low-pressure steam source) heater or heat exchanger by blow-off line.The Steam Actuation small turbine rotates, thereby drag coaxial blower fan, rotates.
Another axle head of the little steam turbine of back pressure type drags industrial frequency generator and rotates, become large or diminish by the output of regulating industrial frequency generator, the load of controlling the little steam turbine of back pressure type correspondingly becomes large or diminishes, thereby the rotating speed that makes the little steam turbine of back pressure type correspondingly diminishes or becomes large, and then the rotating speed of controlling blower fan diminishes or becomes greatly, to meet different working condition requirements.
In other words, namely, by controlling the output (exerting oneself) of industrial frequency generator, can partly or entirely replace the modulating valve throttle style, control the rotating speed of small turbine, thereby efficiently meet rotation speed of fan, control when requiring, improve the operational efficiency of the little steam turbine of back pressure type.
As shown in Figure 3, the back pressure type small turbine drive blower fan system of the industrial frequency generator speed governing of the present embodiment and embodiment's 1 system difference is:
The System Working Principle of the present embodiment is as follows:
When the little steam turbine of Steam Actuation rotated, the blower fan that drags simultaneously coaxial connection rotated, and be positioned at the same axle head of little steam turbine due to industrial frequency generator and blower fan, and industrial frequency generator was positioned at the outside of blower fan.Therefore by the adjusting of timing gear roller box, little steam turbine and then driving industrial frequency generator rotate generating.Become large or diminish by the output of regulating industrial frequency generator, thereby the rotating speed of control blower fan is to meet different working condition requirements.
All quote in this application as a reference at all documents that the present invention mentions, just as each piece document is quoted separately as a reference.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after having read above-mentioned instruction content of the present invention, these equivalent form of values fall within the application's appended claims limited range equally.
Claims (10)
1. the back pressure type small turbine drive blower fan system of an industrial frequency generator speed governing, is characterized in that, described system comprises the little steam turbine of back pressure type, blower fan, industrial frequency generator and timing gear roller box, wherein,
The little steam turbine of described back pressure type, blower fan, industrial frequency generator and the timing gear roller box is coaxial is connected;
The output terminal of described timing gear roller box is connected to drive described industrial frequency generator with the input end of described industrial frequency generator and rotates; And
By controlling the output of described industrial frequency generator, thereby control the rotating speed of the little steam turbine of described back pressure type, thereby control the rotating speed of described blower fan.
2. the system as claimed in claim 1, is characterized in that, the little steam turbine of described back pressure type is provided with the admission pipeline, and described admission pipeline is provided with modulating valve.
3. the system as claimed in claim 1, is characterized in that, described blower fan is connected with the axle head of the little steam turbine of described back pressure type both sides respectively with industrial frequency generator, and described timing gear roller box is between the little steam turbine of described back pressure type and industrial frequency generator.
4. system as claimed in claim 3, is characterized in that, the input end of described timing gear roller box is connected with the axle head of a side of the little steam turbine of described back pressure type, and the input end of described blower fan is connected with the axle head of the opposite side of the little steam turbine of described back pressure type.
5. the system as claimed in claim 1, is characterized in that, described blower fan and industrial frequency generator are connected in the same axle head of the little steam turbine of described back pressure type, and described timing gear roller box is between described blower fan and industrial frequency generator.
6. system as claimed in claim 5, is characterized in that, the input end of described timing gear roller box is connected with the output terminal of described blower fan, and the input end of described blower fan is connected with the axle head of the little steam turbine of described back pressure type.
7. system as described in claim 3 or 5, is characterized in that, is provided with the constant-speed ratio gear-box between the little steam turbine of described back pressure type and blower fan.
8. the system as claimed in claim 1, is characterized in that, described blower fan comprises: medium is the blower fan of air or flue gas, compressor, the gas turbine that medium is air or combustion gas.
9. a steam electric power unit, is characterized in that, described generator set disposes system claimed in claim 1.
10. method of regulating rotation speed of fan in back pressure type small turbine drive blower fan system, described system comprises the little steam turbine of back pressure type and blower fan, it is characterized in that, set up industrial frequency generator in described system, by regulating the output of described industrial frequency generator, thereby control the rotating speed of the little steam turbine of described back pressure type, thereby control the rotating speed of described blower fan.
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| CN201310352592.9A CN103397916B (en) | 2013-08-13 | 2013-08-13 | The back pressure type small turbine drive blower fan system of industrial frequency generator speed governing and method |
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Address after: 200063 Wuning Road, Shanghai, No. 409, No. Applicant after: Co., Ltd of Huabei Power Design Inst., China Power Engineering Consulting Group Address before: 200063 Wuning Road, Shanghai, No. 409, No. Applicant before: Huabei Power Design Inst., China Power Engineering Consulting Group |
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