CN203420741U - Draught fan system capable of regulating speed of power-frequency electric generator and driven by back pressure type small steam turbine and generator set - Google Patents
Draught fan system capable of regulating speed of power-frequency electric generator and driven by back pressure type small steam turbine and generator set Download PDFInfo
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- CN203420741U CN203420741U CN201320494695.4U CN201320494695U CN203420741U CN 203420741 U CN203420741 U CN 203420741U CN 201320494695 U CN201320494695 U CN 201320494695U CN 203420741 U CN203420741 U CN 203420741U
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Abstract
The utility model discloses a draught fan system capable of regulating the speed of a power-frequency electric generator and driven by a back pressure type small steam turbine, and a generator set. The system comprises the back pressure type small steam turbine, a draught fan, the power-frequency electric generator and a speed regulation gear box, wherein the back pressure type small steam turbine, the draught fan, the power-frequency electric generator and the speed regulation gear box are coaxially connected with one another, the output end of the speed regulation gear box is connected with the input end of the power-frequency electric generator so that the power-frequency electric generator can be driven to rotate, the rotating speed of the back pressure type small steam turbine can be controlled by controlling the output of the power-frequency electric generator, and therefore the rotating speed of the draught fan can be controlled. According to the system, losses of steam admission throttling of the small steam turbine are greatly reduced, running efficiency is improved, the performance of the small steam turbine is brought into full play, and running earnings are increased. The utility model further discloses the steam generator set.
Description
Technical field
The utility model relates to the field of energy-saving technology of power generation system, relates to particularly a kind of back pressure type small turbine drive blower fan system and steam electric power unit of industrial frequency generator speed governing.
Background technique
In large capacity high parameter steam turbine power generation factory, conventionally 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 to supply subsequent technique system.
Due to the needs of generator set load variations, usually there is respective change in exerting oneself of blower fan, the needs that therefore conventionally change by the variation of the rotating speed of blower fan being met to unit load, and the rotating speed of blower fan to be rotating speed by the little steam turbine coaxially connecting 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 conventionally 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 conventionally, 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 disposes 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 causing 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 make full use of again driving blower fan system that little steam turbine exerts oneself and be current steam turbine power generation factory in energy-saving field problem demanding prompt solution.
Model utility content
The purpose of this utility model is to provide a kind of restriction loss little, little steam turbine exert oneself back pressure type small turbine drive blower fan system and the steam electric power unit of the high industrial frequency generator speed governing of utilization ratio.
The utility model first aspect 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 timing gear roller box are coaxially connected;
The output terminal of described timing gear roller box is connected to drive described industrial frequency generator to rotate with the input end of described industrial frequency generator; 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, described in draw gas outlet by extraction line, be connected with high temperature heat source heater or heat exchanger.
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 high aperture of the long-term maintenance of the aperture of described modulating valve, 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, 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: medium is the blower fan of air or flue gas, compressor, the gas turbine that medium is air or combustion gas.
The utility model second aspect provides a kind of steam electric power unit, and described generator set disposes the system described in first aspect.
In should be understood that within the scope of the utility model, above-mentioned each technical characteristics of the present utility model 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, at this, tire out and state no longer one by one.
Accompanying drawing explanation
Fig. 1 is existing back pressure type small turbine drive blower fan system schematic diagram.
Fig. 2 is the utility model embodiment 1 system schematic.
Fig. 3 is the utility model embodiment 2 system schematic.
Embodiment
Inventor is through deeply research widely, discovery is by being coaxially connected industrial frequency generator with 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 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 utility model can keep high aperture (aperture scope is 70%-100%) for a long time, has greatly reduced the loss that throttling causes, and has made full use of exerting oneself of little steam turbine, make little steam turbine operational efficiency raising 8%-20%.Completed on this basis the utility model.
Generator as used herein, the electricity that " industrial frequency generator " sends while referring to normal operation is fixed frequency, 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 and steam electric power unit
The back pressure type small turbine drive blower fan system of industrial frequency generator speed governing of the present utility model is in large capacity high parameter steam turbine power generation factory, generator set configure for after the pressure of the working medium such as air, flue gas or combustion gas is improved, supply with one of indispensable system of subsequent technique system institute.
System of the present utility model 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 blower fan is connected on the same rotation axis system of the little steam turbine of back pressure type.Blower fan of the present utility model comprises that medium is that the blower fan of air, compressor, working medium that medium is air are other blower fan of flue gas, the medium compressor that is combustion gas or gas turbine etc.
Timing gear roller box is for being converted to fixed rotating speed by variation 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 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 lay respectively at the axle head of the little steam turbine of back pressure type both sides, 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 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 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 system of the present utility model, the rotating speed that can change according to blower fan regulates by timing gear roller box, is converted into the power frequency rotating speed of 50Hz or 60Hz, thereby drives industrial frequency generator to rotate, and the Partial Power of the little steam turbine of back pressure type is output as to power frequency electricity.
In system of the present utility model, 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 back pressure type, blower fan, industrial frequency generator and the timing gear roller box of the utility model system are for to be coaxially 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, 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 utility model 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 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 (aperture scope is at 70%-100%) for a long time, even when unit load step-down, can be by the variation of rotation speed of fan, make full use of exerting oneself of the little steam turbine of back pressure type, by industrial frequency generator, generate electricity, 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 utility model also comprises the steam electric power unit of the back pressure type small turbine drive blower fan system that disposes industrial frequency generator speed governing.
System of the present utility model 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 Chang Neihuo factory external power grid, if voltage is different between the electricity that industrial frequency generator sends and electrical network, can, by transformer is set, electricity transformation be arrived to the voltage mating with electrical network.
In the back pressure type small turbine drive blower fan system configuring at existing steam electric power unit, annual most of working times, particularly during unit low-load, small turbine is exerted oneself and is all underused.The needs of for example completely sending out summer all the year round in order to meet unit, the small turbine that 1 1000MW steam electric power unit is configured conventionally 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 unit small turbine is exerted oneself allowance for (10000-6000) x2=8000kW.Therefore the small turbine of every unit does not on average utilize power for more than 8000kW, and this allowance configuration exists very large problem.
In addition, because little steam turbine needs throttling, reduction is exerted oneself, and mates with blower fan (as blower fan) power demand, and 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 utlity model has following major advantage:
(1) by the common aperture of the little steam turbine regulating valve of back pressure type in current 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 matches of driving arrangement power demand.
(2) operational efficiency of the little steam turbine of back pressure type of the present utility model can improve 8%-20%, saves 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 utility model makes full use 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, and direct economy income is more than 12,000,000 yuan.
The above-mentioned feature that the utility model is mentioned, or the feature that embodiment mentions can combination in any.All features that this case specification discloses can with any composition forms use, each feature disclosing in specification, the alternative characteristics that can anyly be provided identical, impartial or similar object replaces.Therefore except there being special instruction, the feature disclosing is only the general example of equalization or similar features.
Below in conjunction with specific embodiment, further set forth the utility model.Should be understood that these embodiments are only not used in restriction scope of the present utility model for the utility model is described.The experimental technique of unreceipted actual conditions in the following example, conventionally according to normal condition or the condition of advising according to manufacturer.
Unless otherwise defined, the familiar meaning of all specialties of using in literary composition and scientific words and one skilled in the art is identical.In addition, any method similar or impartial to described content and material all can be applicable in the utility model 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, for regulating the logical vapour amount of high pressure steam, in the present embodiment, the long-term high aperture (aperture scope is 70%-100%) that keeps of 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 moves, little steam turbine regulating valve keeps high aperture (aperture scope is 70%-100%).High pressure steam enters little steam turbine by 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.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, by regulating the output of industrial frequency generator become large or diminish, 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,, by controlling the output (exerting oneself) of industrial frequency generator, can partly or entirely replace 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 1 system difference are:
The System Working Principle of the present embodiment is as follows:
When the little steam turbine of Steam Actuation rotates, the blower fan that simultaneously drags coaxial connection rotates, and 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 adjusting 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, thereby the rotating speed of controlling blower fan is to meet different working condition requirements.
All documents of mentioning at the utility model are all quoted as a reference in this application, just as each piece of document, are quoted as a reference separately.In addition should be understood that those skilled in the art can make various changes or modifications the utility model after having read above-mentioned instruction content of the present utility model, these equivalent form of values fall within the application's appended claims limited range equally.
Claims (10)
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 and timing gear roller box are coaxially connected;
The output terminal of described timing gear roller box is connected to drive described industrial frequency generator to rotate with the input end of described industrial frequency generator; 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 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. the system as described in claim 3 or 5, is characterized in that, between the little steam turbine of described back pressure type and blower fan, is provided with constant-speed ratio gear-box.
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. the system as claimed in claim 1, is characterized in that, the little steam turbine of described back pressure type also comprises the outlet of drawing gas, described in draw gas outlet by extraction line, be connected with high temperature heat source heater or heat exchanger.
10. a steam electric power unit, is characterized in that, described generator set disposes system claimed in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320494695.4U CN203420741U (en) | 2013-08-13 | 2013-08-13 | Draught fan system capable of regulating speed of power-frequency electric generator and driven by back pressure type small steam turbine and generator set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320494695.4U CN203420741U (en) | 2013-08-13 | 2013-08-13 | Draught fan system capable of regulating speed of power-frequency electric generator and driven by back pressure type small steam turbine and generator set |
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| Publication Number | Publication Date |
|---|---|
| CN203420741U true CN203420741U (en) | 2014-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320494695.4U Expired - Fee Related CN203420741U (en) | 2013-08-13 | 2013-08-13 | Draught fan system capable of regulating speed of power-frequency electric generator and driven by back pressure type small steam turbine and generator set |
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| CN (1) | CN203420741U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108868908A (en) * | 2018-06-26 | 2018-11-23 | 中国电力工程顾问集团华东电力设计院有限公司 | Control method, device and the backheat small turbine system of backheat small turbine |
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2013
- 2013-08-13 CN CN201320494695.4U patent/CN203420741U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108868908A (en) * | 2018-06-26 | 2018-11-23 | 中国电力工程顾问集团华东电力设计院有限公司 | Control method, device and the backheat small turbine system of backheat small turbine |
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