CN103397916B - The back pressure type small turbine drive blower fan system of industrial frequency generator speed governing and method - Google Patents
The back pressure type small turbine drive blower fan system of industrial frequency generator speed governing and method Download PDFInfo
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- CN103397916B CN103397916B CN201310352592.9A CN201310352592A CN103397916B CN 103397916 B CN103397916 B CN 103397916B CN 201310352592 A CN201310352592 A CN 201310352592A CN 103397916 B CN103397916 B CN 103397916B
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Abstract
The invention discloses a kind of back pressure type small turbine drive blower fan system and method for industrial frequency generator speed governing, this 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 back pressure type, blower fan, industrial frequency generator are coaxially connected with timing gear roller box; The output terminal of timing gear roller box is connected to drive industrial frequency generator to rotate with the input end of industrial frequency generator; By controlling the output of industrial frequency generator, thus control the rotating speed of the little steam turbine of back pressure type, thus control the rotating speed of blower fan.System of the present invention considerably reduces the loss of little steam turbine admission throttling, improves operational efficiency, and has given full play to the acting ability of little steam turbine, increases and runs income.The invention also discloses a kind of steam electric power unit and regulate the method for rotation speed of fan.
Description
Technical field
The present invention relates to the field of energy-saving technology of power generation system, relate to a kind of back pressure type small turbine drive blower fan system and method for industrial frequency generator speed governing particularly.
Background technique
In Large Copacity high-parameter steam turbine power station, be usually configured with as blower fans such as steam-operating blower fans, these blower fans are driven by the such as little steam turbine of back pressure type, the pressure of the working medium such as air, flue gas or combustion gas can be improved, supply subsequent technique system.
Due to the needs of generator set load variations, usually there is respective change in exerting oneself of blower fan, and therefore the usual change by the rotating speed to blower fan meets the needs of unit load change, and the rotating speed of blower fan is determined by the rotating speed of the little steam turbine coaxially connected.
In order to meet generator set in the summer full needs 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 usually large than exerting oneself required for generator set rated load, so the nominal output of little steam turbine has larger allowance, generally more than 50%.In current small turbine drive blower fan system, little steam turbine is configured with admission modulating valve, by the aperture of modulating valve, can control the rotating speed of little steam turbine, thus meet the needs of generator set load variations.But this configuration is usually because the aperture of little steam turbine admission modulating valve under most working time is less, therefore easily causes larger restriction loss.
In addition, due to the load of generator set with electrical network demand every day all in continuous change, it is low that load has height to have, and therefore when low-load, the aperture of the admission modulating valve of little steam turbine can be less, thus the restriction loss caused is larger.And because the ability of the acting of little steam turbine can not give 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 effectively can reduce little steam turbine admission throttling, can make full use of again the driving blower fan system that little steam turbine exerts oneself is that current steam turbine power generation factory is in 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, little steam turbine is exerted oneself the back pressure type small turbine drive blower fan system of the high industrial frequency generator speed governing of utilization ratio.
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 are coaxially connected with timing gear roller box;
The output terminal of described timing gear roller box is connected with the input end of described industrial frequency generator to drive described industrial frequency generator to rotate; And
By controlling the output of described industrial frequency generator, thus control the rotating speed of the little steam turbine of described back pressure type, thus control the rotating speed of described blower fan.
In another preference, the little steam turbine of described back pressure type also comprises outlet of drawing gas.
In another preference, described in draw gas outlet be 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 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 aperture of described modulating valve keeps high aperture for a long time, and open range is 70%-100%.
In another preference, the axle head of described blower fan and industrial frequency generator steam turbine both sides little of described back pressure type is respectively connected, 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 the 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 to 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, between the little steam turbine of described back pressure type and blower fan, be provided with constant-speed ratio gear-box.
In another preference, described blower fan comprises: compressor, gas turbine that the blower fan that medium is air or flue gas, medium are air or combustion gas.
Second aspect present invention provides a kind of steam electric power unit, and described generator set is configured with the system described in first aspect.
Third aspect present invention provides a kind of method 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 the system, by regulating the output of described industrial frequency generator, thus control the rotating speed of the little steam turbine of described back pressure type, thus control the rotating speed of described blower fan.
Should be understood that within the scope of the present invention, above-mentioned each technical characteristics of the present invention and can combining mutually between specifically described each technical characteristics in below (eg embodiment), thus form new or preferred technological scheme.As space is limited, tiredly no longer one by one to state at this.
Accompanying drawing explanation
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
Inventor is through deeply studying widely, find by being coaxially connected industrial frequency generator with the little steam turbine of back pressure type, not only by controlling the mode of exerting oneself of industrial frequency generator, part or all of replacement modulating valve mode, to control the rotating speed of little steam turbine, thus control the rotating speed of blower fan, and industrial frequency generator can be utilized to generate electricity, thus 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 (open range is 70%-100%) for a long time, and greatly reduce the loss that throttling causes, and make full use of exerting oneself of little steam turbine, what make the operational efficiency of little steam turbine improves 8%-20%.Complete the present invention on this basis.
As used herein, the electricity sent when " industrial frequency generator " refers to normal operation 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, " being coaxially 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 Copacity high-parameter steam turbine power station, generator set configure for after the pressure of the working medium such as air, flue gas or combustion gas is improved, 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 admission pipeline, for regulating the logical vapour amount of high pressure steam;
Blower fan is coaxially connected with the little steam turbine of back pressure type, and namely blower fan is connected on the same rotation axis system of the little steam turbine of back pressure type.The compressor that blower fan of the present invention comprises blower fan that medium is air, medium is air, working medium are other blower fan of flue gas, medium is combustion gas compressor or gas turbine etc.
Timing gear roller box is used for change rotating speed being 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 to rotate with the input end of industrial frequency generator.
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 and blower fan can the axle head of steam turbine both sides little of back pressure type respectively be connected, and also can be connected to the same axle head of the little steam turbine of back pressure type.
When industrial frequency generator and blower fan lay respectively at the axle head of the little steam turbine both sides of back pressure type, timing gear roller box between the little steam turbine of back pressure type and industrial frequency generator, and is coaxially connected with industrial frequency generator 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 the side of the little steam turbine of back pressure type, 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 are positioned at the same axle head of the little steam turbine of back pressure type, timing gear roller box is arranged between blower fan and industrial frequency generator, and is coaxially connected with industrial frequency generator with blower fan.And the input end of timing gear roller box is connected with the output terminal of blower fan, the input end of blower fan is connected with the axle head of the little steam turbine of back pressure type.
In the system of the present invention, can be regulated by timing gear roller box according to the rotating speed of blower fan change, be converted into the power frequency rotating speed of 50Hz or 60Hz, thus drive industrial frequency generator to rotate, the Partial Power of little for back pressure type steam turbine is exported as power frequency electric.
In system of the present invention, the little steam turbine of back pressure type also can comprise outlet of drawing gas, and 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 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 back pressure type of present system, blower fan, industrial frequency generator with timing gear roller box for be coaxially connected.When the rotating speed ratio of blower fan and the little steam turbine of back pressure type is larger, the rotatingshaft between the little steam turbine of back pressure type and blower fan can arranges constant-speed ratio gear-box, 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 regulates 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 the whole year most working time, the aperture of the modulating valve of the little steam turbine of back pressure type can keep high aperture (open range is at 70%-100%) for a long time, even if when unit load step-down, by the change of rotation speed of fan, make full use of exerting oneself of the little steam turbine of back pressure type, generated electricity by industrial frequency generator, not only significantly reduce restriction loss, and improve 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 being configured with industrial frequency generator speed governing.
System of the present invention both by the adjustment of rotation speed of fan to meet the needs of generator set load variations, also generate electricity by industrial frequency generator with the sale of electricity income improving power plant, the variable-frequency electric that industrial frequency generator sends can supply in factory or factory's external power grid, if the electricity that industrial frequency generator sends is different from voltage between electrical network, then can by arranging transformer, by electricity transformation to the voltage mated 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 time, particularly during unit low-load, small turbine is exerted oneself and is all underused.Such as in order to meet the needs that unit is completely sent out all the year round summer, the small turbine 1 1000MW steam electric power unit being configured usually to 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 platform unit small turbine exerts oneself allowance for (10000-6000) x2=8000kW.Therefore the small turbine of every platform unit does not on average utilize power to be more than 8000kW, and this allowance configuration exists very large problem.
In addition, because little steam turbine needs throttling, reduction is exerted oneself, and mate with blower fan (as blower fan) power demand, 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) the common aperture of the little steam turbine regulating valve of back pressure type in current system is increased to 70%-100% from less than 50%, and high aperture level can being kept for a long time, significantly reducing the loss that throttling causes because matching with driving arrangement power demand of little steam turbine.
(2) operational efficiency of the little steam turbine of back pressure type of the present invention can improve 8%-20%, saves mark more than 4000 tons, coal every platform 1000MW unit year, significantly reduces operating cost, and reach the comprehensive benefit of decreasing pollution thing discharge.
(3) system of the present invention makes full use of the acting ability of little steam turbine, is generated electricity by industrial frequency generator, and every platform 1000MW unit can externally be powered 6,000 ten thousand kilowatts every year, direct economy income more than 1,200 ten thousand 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 disclosed in specification, anyly can be provided alternative characteristics that is identical, impartial or similar object and replace.Therefore apart from special instruction, the feature disclosed is only general example that is impartial or similar features.
Below in conjunction with specific embodiment, set forth the present invention further.Should be understood that these embodiments are only not used in for illustration of the present invention to limit the scope of the invention.The experimental technique of unreceipted actual conditions in the following example, the usually conveniently conditioned disjunction condition of advising according to manufacturer.
Unless otherwise defined, all specialties used in literary composition and scientific words and one skilled in the art the meaning be familiar with identical.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.
Embodiment 1
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, for regulating the logical vapour amount of high pressure steam, in the present embodiment, the aperture of modulating valve 13 keeps high aperture (open range is 70%-100%) for a long time.Extraction line 14 is connected with high temperature heat source (high-pressure steam source) heater or heat exchanger (not marking in figure).
Blower fan 2 is positioned at the axle head of back pressure type little steam turbine 1 side, according to the rotating speed ratio between blower fan 2 and the little steam turbine 1 of back pressure type, between blower fan 2 and the little steam turbine 1 of back pressure type, constant-speed ratio gear-box 5 is optionally set, constant-speed ratio gear-box 5 is coaxially connected with the little steam turbine 1 of back pressure type, the input end of constant-speed ratio gear-box 5 is connected with the axle head of back pressure type little steam turbine 1 side, and the output terminal of constant-speed ratio gear-box 5 is connected with the input end of blower fan 2.
Industrial frequency generator 3 is positioned at the axle head of back pressure type little steam turbine 1 opposite side, and the input end of timing gear roller box 4 is connected with the axle head of back pressure type little steam turbine 1 opposite side, and the output terminal of timing gear roller box 4 is connected to drive industrial frequency generator 3 to rotate with the input end of industrial frequency generator 3.
The little steam turbine of back pressure type also comprises outlet (not shown) of drawing gas, and 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 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 runs, little steam turbine regulating valve keeps high aperture (open range is 70%-100%).High pressure steam enters little steam turbine by admission pipeline, and the low pressure steam after acting is discharged to low-temperature heat source (low-pressure steam source) heat user such as heater or heat exchanger by blow-off line.Steam Actuation small turbine rotates, thus drags coaxial blower fan rotation.
Another axle head of the little steam turbine of back pressure type drags industrial frequency generator and rotates, become large by regulating the output of industrial frequency generator or diminish, the load controlling the little steam turbine of back pressure type correspondingly becomes large or diminishes, thus the rotating speed of the little steam turbine of back pressure type is correspondingly diminished or becomes large, and then the rotating speed controlling blower fan diminishes or becomes large, 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 modulating valve throttle style, controlling the rotating speed of small turbine, thus while efficiently meeting rotation speed of fan control overflow, improve the operational efficiency of the little steam turbine of back pressure type.
Embodiment 2
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 the system difference of embodiment 1 are:
Blower fan 2 and industrial frequency generator 3 are positioned at the same axle head of the little steam turbine of back pressure type 1, between blower fan 2 and the little steam turbine 1 of back pressure type, optionally arrange constant-speed ratio gear-box 5, and constant-speed ratio gear-box 5 is coaxially connected with the little steam turbine 1 of back pressure type.The input end of constant-speed ratio gear-box 5 is connected with the axle head of the little steam turbine 1 of back pressure type, the output terminal of constant-speed ratio gear-box 5 is connected with the input end of blower fan 2, the output terminal of blower fan 2 is connected with the input end of timing gear roller box 4, and the output terminal of timing gear roller box 4 is connected with the input end of industrial frequency generator 3.
The System Working Principle of the present embodiment is as follows:
When the little steam turbine of Steam Actuation rotates, drag the coaxial blower fan connected simultaneously and rotate, because industrial frequency generator and blower fan are positioned at the same axle head of little steam turbine, and industrial frequency generator is positioned at the outside of blower fan.Therefore by the adjustment of timing gear roller box, little steam turbine and then driving industrial frequency generator rotate generating.By regulating the output of industrial frequency generator become large or diminish, thus the rotating speed of control blower fan is to meet different working condition requirements.
The all documents mentioned in the present invention are quoted as a reference all in this application, are just quoted separately as a reference as each section of document.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after having read above-mentioned instruction content of the present invention.
Claims (5)
1. a back pressure type small turbine drive blower fan system for 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 are coaxially connected with timing gear roller box;
The output terminal of described timing gear roller box is connected with the input end of described industrial frequency generator to drive described industrial frequency generator to rotate, and timing gear roller box is used for change rotating speed to be converted to fixed rotating speed; And
By controlling the output of described industrial frequency generator, thus control the rotating speed of the little steam turbine of described back pressure type, thus control the rotating speed of described blower fan,
Wherein, the little steam turbine of described back pressure type is provided with admission pipeline, and described admission pipeline is provided with modulating valve;
And between the little steam turbine of described back pressure type and blower fan, be provided with constant-speed ratio gear-box;
And described blower fan medium is air, flue gas or combustion gas; And
Described blower fan and industrial frequency generator are connected to 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.
2. the system as claimed in claim 1, is characterized in that, described timing gear roller box is the pattern with clutch function.
3. the system as claimed in claim 1, is characterized in that, described timing gear roller box is used for the power frequency rotating speed rotating speed that blower fan changes being converted into 50Hz or 60Hz, thus drives industrial frequency generator to rotate.
4. a steam electric power unit, is characterized in that, described generator set is configured with the back pressure type small turbine drive blower fan system of industrial frequency generator speed governing according to claim 1.
5. one kind regulates the method for 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 the system, form the back pressure type small turbine drive blower fan system of industrial frequency generator speed governing according to claim 1, and by regulating the output of described industrial frequency generator, thus control the rotating speed of the little steam turbine of described back pressure type, thus 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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| CN104638670A (en) * | 2015-01-14 | 2015-05-20 | 华电莱州发电有限公司 | Thermal power plant power generator unit with variable-frequency power generator set and steam turbine power generator unit in coaxial arrangement |
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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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