CN103397917A - Back-pressure car driving water-feeding pump system and method adopting variable-frequency power generator for speed regulation - Google Patents
Back-pressure car driving water-feeding pump system and method adopting variable-frequency power generator for speed regulation Download PDFInfo
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- CN103397917A CN103397917A CN2013103522460A CN201310352246A CN103397917A CN 103397917 A CN103397917 A CN 103397917A CN 2013103522460 A CN2013103522460 A CN 2013103522460A CN 201310352246 A CN201310352246 A CN 201310352246A CN 103397917 A CN103397917 A CN 103397917A
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Abstract
The invention provides a back-pressure car driving water-feeding pump system and method adopting a variable-frequency power generator for speed regulation. The system comprises a back-pressure car, a water-feeding pump and the variable-frequency power generator, wherein the back-pressure car, the water-feeding pump and the variable-frequency power generator are coaxially connected with one another; the rotational speed of the back-pressure car is controlled by controlling the output of the variable-frequency power generator, so as to further control the rotational speed of the water-feeding pump. The system provided by the invention has the advantages that the admission throttling loss of the car is greatly reduced; the operation efficiency is improved; the acting capability of the car is given full play; the operation benefit is improved.
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 feed-water pump and method of frequency conversion generator speed governing.
Background technique
In large capacity high parameter steam turbine power generation factory, usually configure steam feed pump system group.These feed-water pump groups drive by steam turbine as little in back pressure type, will feed water and improve pressure, supply with the subsequent technique system.
Change according to unit load, need the respective change of exerting oneself of feed-water pump, the respective change by the feed-water pump rotating speed meets usually, and the feed-water pump rotating speed is by the rotating speed decision of the little steam turbine of back pressure type of coaxial connection.
Completely send out in order to meet long-term summer unit, the nominal output of the little steam turbine of back pressure type is usually large than the nominal output of feed-water pump, the nominal output of feed-water pump is exerted oneself greatly than unit rated load is needed,, therefore the nominal output of the little steam turbine of back pressure type has larger allowance, is generally more than 20%.In prior art, the little steam turbine configuration of back pressure type admission modulating valve,, by the aperture of modulating valve, can control the rotating speed of the little steam turbine of back pressure type.Yet this configuration causes the little steam turbine admission of back pressure type modulating valve most working time of aperture less, causes 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 the little steam turbine of back pressure type can be less, thereby the restriction loss that causes is larger.And, because the ability of the acting of the little steam turbine of back pressure type can not be given full play to, therefore also there is relatively large economic loss.
Fig. 1～3 illustrate the system flow chart of 3 kinds of exemplary configurations of existing back pressure type small turbine drive feed-water pump.As shown in Figure 1, the little steam turbine 1 of back pressure type is connected with feed-water pump 4 is coaxial, on the admission pipeline 101 of the little steam turbine of back pressure type, modulating valve 1 is housed.During normal operation, high pressure steam enters the little steam turbine 1 of back pressure type, and the little steam turbine 1 of Steam Actuation back pressure type rotates, and rotates the low pressure steam discharge after acting or draw gas blow-off line 102 or extraction line 3 thereby drag coaxial feed-water pump 4.Feed-water pump 4 improves the pressure of feedwater, supplies with the subsequent technique system.The progression of blow-off line or extraction line is optional, and the progression that draws gas is n, n=1,2,3,4,5 or 6.The aperture of regulating the modulating valve 2 on the little steam turbine admission of back pressure type pipeline 101 changes throttle flow, thereby changes the output power of the little steam turbine 1 of back pressure type, and then changes the rotating speed of feed-water pump 4, to meet different generator set burden requirements.
As shown in Figure 2, feed water pump group 200 is comprised of front-mounted pump system 5 and feed-water pump 4, coaxial two axle heads that are connected in the little steam turbine 1 of back pressure type of feed-water pump 4 and front-mounted pump system 5 are arranged respectively,, according to the rotating speed coupling, need between the output terminal of front-mounted pump system 5 and the little steam turbine 1 of back pressure type, constant-speed ratio gear-box 6 be housed.High pressure steam enters the little steam turbine 1 of back pressure type, and the little steam turbine 1 of Steam Actuation back pressure type rotates, thereby drags coaxial feed- water pump 4 and 5 rotations of front-mounted pump system, and front-mounted pump system 5 and feed-water pump 4 successively make the pressure of feedwater improve, and supply with the subsequent technique system.The aperture of regulating the modulating valve 2 on the little steam turbine 1 admission pipeline 101 of back pressure type is controlled the rotating speed of front-mounted pump system 5 and feed-water pump 4 in feed water pump group 200, to meet different unit load requirements.
System shown in Figure 3 composition and working principle and Fig. 2 are similar, different is, feed-water pump 4 and front-mounted pump system 5 are positioned at the homonymy output terminal of little steam turbine 1,, according to the rotating speed coupling, need between the output terminal of feed-water pump 4 and front-mounted pump system 5, constant-speed ratio gear-box 6 be housed.
Completely send out in order to meet long-term summer unit, the nominal output of the little steam turbine of back pressure type is usually large than the nominal output of feed water pump, the nominal output of feed water pump is exerted oneself greatly than unit rated load is needed,, therefore the nominal output of the little steam turbine of back pressure type has larger allowance, is generally more than 20%.In prior art, the little steam turbine configuration of back pressure type admission modulating valve,, by the aperture of modulating valve, can control the rotating speed of the little steam turbine of back pressure type.
For example, to 1 1000MW steam electric power unit, usually configure the steam feed pump group of 2 50% capacity.The declared working condition power demand of feed water pump is about 17000kW, and the little steam turbine maximum output of supporting back pressure type is about 22000kW, and every little steam turbine of unit back pressure type allowance of exerting oneself is (22000-17000) x2=10000kW.This is completely send out summer all the year round and configure in order to meet unit.
There is following existing issue in this allowance configuration:
1, the little steam turbine of back pressure type needs throttling, and reduction is exerted oneself, and, with feed water pump group power demand coupling, has obvious restriction loss.The control valve opening of the little steam turbine of back pressure type is less, and common aperture, below 60%, affects the little steam turbine operational efficiency of back pressure type more than 5%;
2, annual most of working time, particularly during the unit low-load, the little steam turbine of back pressure type is exerted oneself and is all underused.The little steam turbine of the back pressure type of every unit does not on average utilize power for more than 10000kW.
Therefore, how for the throttle grverning problem of existing back pressure type small turbine drive feed-water pump, develop a kind of loss that can effectively reduce the little steam turbine admission of back pressure type throttling, can take full advantage of again driving feed-water pump that the little steam turbine of back pressure type back pressure type 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 feed-water pump of the high frequency conversion generator speed governing of utilization ratio of little steam turbine.
First aspect present invention provides a kind of back pressure type small turbine drive feed-water pump of frequency conversion generator speed governing, and described system comprises the little steam turbine of back pressure type, feed water pump and frequency conversion generator, wherein,
The little steam turbine of described back pressure type, feed water pump and frequency conversion generator is coaxial is connected;
By regulating the output of described frequency conversion generator, thereby control the rotating speed of the little steam turbine of described back pressure type, and then control the rotating speed of described feed water pump.
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 frequency conversion generator is connected with current 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 scope of aperture is 70%-100%.
In another preference, described feed water pump is connected with the axle head of the little steam turbine of described back pressure type both sides respectively with frequency conversion generator.
In another preference, described system also comprises the constant-speed ratio gear-box, and described constant-speed ratio gear-box is coaxial to be connected between the little steam turbine of described back pressure type and frequency conversion generator.
In another preference, described constant-speed ratio gear-box has the clutch function.
In another preference, described constant-speed ratio gear-box is clutch.
In another preference, the input end of described constant-speed ratio gear-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 feed-water pump is connected with the axle head of the opposite side of the little steam turbine of described back pressure type.
In another preference, described system also comprises front-mounted pump, and described front-mounted pump and described feed water pump are connected in the same axle head of the little steam turbine of described back pressure type, and the input end of described front-mounted pump is connected with described feedwater delivery side of pump.
In another preference, be provided with the constant-speed ratio gear-box between described front-mounted pump and described feed water pump, described constant-speed ratio gear-box is connected with described front-mounted pump and feed water pump are coaxial.
In another preference, the input end of described constant-speed ratio gear-box is connected with described feedwater delivery side of pump, and the output terminal of described constant-speed ratio gear-box is connected with the input end of described front-mounted pump system.
In another preference, described feed water pump and frequency conversion generator are connected in the same axle head of the little steam turbine of described back pressure type.
In another preference, the input end of described feed water pump 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 frequency conversion generator is connected with the output terminal of described feed-water pump.
In another preference, described system also comprises the constant-speed ratio gear-box, and described constant-speed ratio gear-box is coaxial to be connected between described feed water pump and frequency conversion generator.
In another preference, the input end of described constant-speed ratio gear-box is connected with described feedwater delivery side of pump, and the output terminal of described constant-speed ratio gear-box is connected with the input end of described frequency conversion generator.
In another preference, described system also comprises front-mounted pump, and described front-mounted pump is coaxial to be connected between described constant-speed ratio gear-box and frequency conversion generator.
In another preference, the input end of described front-mounted pump is connected with the output terminal of described constant-speed ratio gear-box, and described preposition delivery side of pump is connected with the input end of described frequency conversion generator.
In another preference, described system also comprises front-mounted pump, and described front-mounted pump is positioned at the outside of described frequency conversion generator, and the input end of front-mounted pump is connected with the output terminal of described frequency conversion generator.
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 speed of feedwater in back pressure type small turbine drive feed-water pump, described system comprises the little steam turbine of back pressure type and feed water pump, set up frequency conversion generator in described system, by regulating the output of described frequency conversion generator, thereby control the rotating speed of the little steam turbine of described back pressure type, and then control the rotating speed of described feed water pump.
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. 1～3 are back pressure type small turbine drive feed-water pump schematic diagram in prior art.
Fig. 4 is the system flow schematic diagram according to the back pressure type small turbine drive feed-water pump of the frequency conversion generator speed governing of first embodiment of the invention.
Fig. 5 is the system flow schematic diagram according to the back pressure type small turbine drive feed-water pump of the frequency conversion generator speed governing of second embodiment of the invention.
Fig. 6 is the system flow schematic diagram according to the back pressure type small turbine drive feed-water pump of the frequency conversion generator speed governing of third embodiment of the invention.
Fig. 7 is the system flow schematic diagram according to the back pressure type small turbine drive feed-water pump of the frequency conversion generator speed governing of fourth embodiment of the invention.
Fig. 8 is the system flow schematic diagram according to the back pressure type small turbine drive feed-water pump of the frequency conversion generator speed governing of fifth embodiment of the invention.
Fig. 9 is the system flow schematic diagram according to the back pressure type small turbine drive feed-water pump of the frequency conversion generator speed governing of sixth embodiment of the invention.
Embodiment
The inventor is through deeply research widely, discovery by with the coaxial frequency conversion 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 frequency conversion generator, partly or entirely replace the modulating valve mode, to control the rotating speed of little steam turbine, thereby control the rotating speed of feed water pump, and can utilize frequency conversion 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, " frequency conversion generator " refers to for the generator that is fixed frequency with respect to conventional power generation usage, and the frequency of generating is at any time at the generator that changes in a big way.
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.
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 60%, 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 5%-20%, saves the mark coal 1000MW unit year more than 5000 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 frequency conversion generator, generates electricity, and every 1000MW unit can externally be powered 7,500 ten thousand kilowatts every year more, and the direct economy income is more than 15,000,000 yuan.
Below with reference to accompanying drawing, preferred embodiment of the present invention is elaborated, so that clearer understanding objects, features and advantages of the present invention.It should be understood that embodiment shown in the drawings is not limitation of the scope of the invention, and just for the connotation of technical solution of the present invention is described.
Fig. 4～9 are respectively 6 embodiments' of back pressure type small turbine drive feed-water pump of frequency conversion generator speed governing of the present invention system flow schematic diagram.The back pressure type small turbine drive feed-water pump of frequency conversion generator speed governing is comprised of the little steam turbine 100 of back pressure type, feed water pump 4 or several major parts such as feed water pump group 200, variable-frequency power generation system 300 and constant-speed ratio gear-box 6.Wherein, the little steam turbine 100 of back pressure type comprises little steam turbine 1, admission pipeline 101, modulating valve 2 and blow-off line 102; Feed water pump group 200 comprises feed water pump 4 and front-mounted pump 5; Variable-frequency power generation system 300 comprises frequency conversion generator 7, current transformer 8 and optional transformer 9.The little steam turbine 100 of back pressure type, feed water pump 4 or feed water pump group 200, frequency conversion generator 7 and the coaxial connection of constant-speed ratio gear-box 6.In part embodiment, in the back pressure type small turbine drive feed-water pump of frequency conversion generator speed governing, another constant-speed ratio gear-box 6 or clutch 11 can be installed as required.Present technique also can be applicable to other high powered water pumps.
Fig. 4 illustrates the first embodiment's the system flow chart of the back pressure type small turbine drive feed-water pump of frequency conversion generator speed governing of the present invention.During normal operation, the modulating valve 2 of the little steam turbine 100 of back pressure type keeps large (even standard-sized sheet) aperture, high pressure steam enters little steam turbine 1, the little steam turbine 1 of Steam Actuation rotates, thereby an output terminal at the little steam turbine of back pressure type drags 4 rotations of coaxial feed water pump, and the low pressure after acting is discharged to low-temperature heat source (low-pressure steam source) heater or heat exchanger by blow-off line 102.Feed water pump 4 improves the pressure of feedwater, supplies with the subsequent technique system.
In system of the present invention, the little steam turbine of back pressure type also can comprise the outlet of drawing gas, and the little steam turbine of back pressure type can be as required, configuration extraction line 3.The outlet of drawing gas is connected with high temperature heat source (high-pressure steam source) heater or heat exchanger by extraction line 3.The progression of exhaust duct and extraction line is optional, and the progression that draws gas is n, n=1,2,3,4,5.
Another output terminal of the little steam turbine of back pressure type drags frequency conversion generator 7, can match as required constant-speed ratio gear-box 6 between little steam turbine 1 and frequency conversion generator 7.The variable-frequency electric that frequency conversion generator 7 sends can direct all or part of supply variable-frequency electric user, also can be all or part of by current transformer 8, become the power frequency electricity (frequency is generally 50Hz or 60Hz) with the electrical network coupling, and supply with in factory or factory's external power grid.If between frequency conversion generator and electrical network, voltage is different, transformer 9 can be set, with the electricity transformation to the voltage with the electrical network coupling.
Change its load by the excitation system of regulating frequency conversion generator 7, thereby the total load that makes little steam turbine 1 bear changes, because the throttle flow of little steam turbine 1 is constant, the variation of total load will cause the rotation speed change of little steam turbine 1, and then meet the rotating speed requirement of the feed water pump 4 of little steam turbine 1 opposite side, to adapt to the different working condition requirements of generator set.
In other words, namely, by controlling the output (exerting oneself) of frequency conversion generator 7, can partly or entirely replace modulating valve 2 throttle styles, control the rotating speed of little steam turbine 1, thereby when meeting feed water pump 4 rotating speeds control requirements, improved the operational efficiency of the little steam turbine of back pressure type.
The second embodiment shown in Figure 5 is identical with first embodiment's basic functional principle shown in Figure 4, and different is, variable-frequency power generation system 300 and the coaxial same output terminal that is arranged in little steam turbine 1 that is connected of feed water pump 4, and wherein, feed water pump 4 is near the output terminal of little steam turbines 1.Can match as required constant-speed ratio gear-box 6 between feed water pump 4 and frequency conversion generator 7.
During normal operation, the modulating valve 2 of the little steam turbine 100 of back pressure type keeps large (even standard-sized sheet) aperture, and high pressure steam enters little steam turbine 1, and the little steam turbine 1 of Steam Actuation rotates, thereby drags feed water pump 4 and frequency conversion generator 7 rotates simultaneously.Feed water pump 4 improves the pressure of feedwater, supplies with the subsequent technique system.The variable-frequency electric that frequency conversion generator 7 sends can direct all or part of supply variable-frequency electric user, also can be all or part of by current transformer 8, become the power frequency electricity (frequency is generally 50Hz or 60Hz) with the electrical network coupling, and supply with in factory or factory's external power grid.If between frequency conversion generator and electrical network, voltage is different, transformer 9 can be set, with the electricity transformation to the voltage with the electrical network coupling.
Generator set load becomes large or while diminishing, the excitation system of regulating frequency conversion generator 7 changes its load and diminishes or become large, thereby make little steam turbine 1 output terminal total load diminish or become large, because the throttle flow of little steam turbine 1 is constant, the variation of total load will cause the rotating speed of little steam turbine 1 become large or diminish, the rotating speed of feed water pump 4 correspondingly becomes large or diminishes, thereby meets the requirement of generator set working conditions change.
The present invention shown in Fig. 6-8 third and fourth, five embodiments and Fig. 4, first and second embodiment's shown in Figure 5 basic functional principle is identical, feed water pump group 200 comprises feed water pump 4 and front-mounted pump 5.
As shown in Figure 6, in the third embodiment of the present invention, feed water pump group 200 is distinguished coaxial arrangement in the different output terminals of little steam turbine 1 from variable-frequency power generation system 300.In the feed water pump group 200 of little steam turbine 1 one sides, feed water pump 4, near the output terminal of little steam turbine 1, configures suitable constant-speed ratio gear-box 6 according to the needs of rotating speed coupling between feed water pump 4 and front-mounted pump 5.And, at the opposite side of little steam turbine 1, can match as required constant-speed ratio gear-box 6 between little steam turbine 1 and frequency conversion generator 7.
During normal operation, the modulating valve 2 of the little steam turbine 100 of back pressure type keeps large (even standard-sized sheet) aperture, and high pressure steam enters little steam turbine 1, and the little steam turbine 1 of Steam Actuation rotates, thereby drags feed water pump group 200 and frequency conversion generator 7 rotates simultaneously.After entering feed water pump 4 and carry out two-stage pressurizing through the water of front-mounted pump 5 one-levels pressurizations, supply with the subsequent technique system.The variable-frequency electric that frequency conversion generator 7 sends can direct all or part of supply variable-frequency electric user, also can be all or part of by current transformer 8, become the power frequency electricity (frequency is generally 50Hz or 60Hz) with the electrical network coupling, and supply with in factory or factory's external power grid.If between frequency conversion generator and electrical network, voltage is different, transformer 9 can be set, with the electricity transformation to the voltage with the electrical network coupling.
Generator set load becomes large or while diminishing, the excitation system of regulating frequency conversion generator 7 diminishes its load or becomes large, thereby make little steam turbine 1 output terminal total load diminish or become large, and then the rotating speed that makes little steam turbine 1 becomes large or diminishes, the rotating speed of the feed water pump 4 that directly is connected with little steam turbine 1 output terminal correspondingly becomes large or diminishes, the rotating speed of front-mounted pump 5 also becomes large or diminishes according to the corresponding demagnification of the reduction speed ratio ground of constant-speed ratio gear-box, thereby meets the requirement of generator set working conditions change.
As shown in Figure 7, in the fourth embodiment of the present invention, feed water pump group 200 is with variable-frequency power generation system 300 coaxial arrangement in the same output terminal of little steam turbine 1, and feed water pump 4 directly is connected with little steam turbine 1 output terminal, and frequency conversion generator 7 coaxial arrangement are between feed water pump 4 and front-mounted pump 5.According to the rotating speed coupling, need to constant-speed ratio gear-box 6 be installed between feed water pump 4 and front-mounted pump 5, in the present embodiment shown in Figure 7, constant-speed ratio gear-box 6 coaxial arrangement are between feed water pump 4 and frequency conversion generator 7.Change requirement according to actual conditions, but also coaxial arrangement is between frequency conversion generator 7 and front-mounted pump 5 for constant-speed ratio gear-box 6, figure does not show.
With above embodiment similarly, little steam turbine 1 rotation drags feed water pump group 200 and frequency conversion generator 7 rotates simultaneously, when the generator set operating mode changes, by regulating the output (exerting oneself) of frequency conversion generator 7, partly or entirely replace modulating valve 2 throttle styles, control the rotating speed of little steam turbine 1, thereby the rotating speed of adjusting front-mounted pump 5 and feed water pump 4 makes it to meet the working conditions change requirement.
As shown in Figure 8, in the fifth embodiment of the present invention, feed water pump group 200 is with variable-frequency power generation system 300 coaxial arrangement in the same output terminal of little steam turbine 1, and feed water pump 4 directly is connected with little steam turbine 1 output terminal, and front-mounted pump 5 coaxial arrangement are between feed water pump 4 and frequency conversion generator 7., according to the rotating speed coupling, between feed water pump 4 and front-mounted pump 5, constant-speed ratio gear-box 6 is installed.
With above embodiment similarly, little steam turbine 1 rotation drags feed water pump group 200 and frequency conversion generator 7 rotates simultaneously, when the generator set operating mode changes, by regulating the output (exerting oneself) of frequency conversion generator 7, partly or entirely replace modulating valve 2 throttle styles, control the rotating speed of little steam turbine 1, thereby the rotating speed of adjusting front-mounted pump 5 and feed water pump 4 makes it to meet the working conditions change requirement.
The 6th embodiment shown in Figure 9 is identical with first embodiment's basic functional principle shown in Figure 4, and different is can match as required clutch 11 between frequency conversion generator 7 and little steam turbine 1.Clutch 11 plays the function of constant-speed ratio gear-box while connecting, when clutch 11 disconnected, variable-frequency power generation system 300 was separated with the little steam turbine 100 of back pressure type, and system is got back to prior art as shown in Figure 1.
The present invention is directed to the technical problem of the throttle grverning of existing back pressure type small turbine drive feed water pump technology, increase and the coaxial frequency conversion generator that is connected of back pressure type small turbine drive feed water pump group, exert oneself to regulate speed of feedwater by what control frequency conversion generator, not only can reduce the loss of little steam turbine admission throttling, and can take full advantage of exerting oneself of little steam turbine,, by the multiple electricity of frequency conversion generator, improve the sale of electricity income of power plant.
To 1 1000MW ultra supercritical power generation unit, adopt the present invention, the control valve opening of little steam turbine can remain on even 100% full gate of large aperture for a long time, significantly reduce restriction loss, little steam turbine operational efficiency improves more than 5%, save the mark coal year more than 5000 tons, can significantly reduce operating cost, and reach the comprehensive benefit that reduces pollutant emission; In addition, can take full advantage of the acting ability of small turbine, by frequency conversion generator, generate electricity, every year is power 7,500 ten thousand kilowatts externally more, and the direct economy income is more than 1,500 ten thousand yuan.
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 feed-water pump of a frequency conversion generator speed governing, is characterized in that, described system comprises the little steam turbine of back pressure type, feed water pump and frequency conversion generator, wherein,
The little steam turbine of described back pressure type, feed water pump and frequency conversion generator is coaxial is connected;
By regulating the output of described frequency conversion generator, thereby control the rotating speed of the little steam turbine of described back pressure type, and then control the rotating speed of described feed water pump.
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 feed water pump is connected with the axle head of the little steam turbine of described back pressure type both sides respectively with frequency conversion generator.
4. system as claimed in claim 3, is characterized in that, described system also comprises the constant-speed ratio gear-box, and described constant-speed ratio gear-box is coaxial to be connected between the little steam turbine of described back pressure type and frequency conversion generator.
5. system as claimed in claim 3, is characterized in that, described system also comprises front-mounted pump, and described front-mounted pump and described feed water pump are connected in the same axle head of the little steam turbine of described back pressure type, and the input end of described front-mounted pump is connected with described feedwater delivery side of pump.
6. the system as claimed in claim 1, is characterized in that, described feed water pump and frequency conversion generator are connected in the same axle head of the little steam turbine of described back pressure type.
7. system as claimed in claim 6, is characterized in that, described system also comprises the constant-speed ratio gear-box, and described constant-speed ratio gear-box is coaxial to be connected between described feed water pump and frequency conversion generator.
8. system as claimed in claim 7, is characterized in that, described system also comprises front-mounted pump, and described front-mounted pump is coaxial to be connected between described constant-speed ratio gear-box and frequency conversion generator.
9. system as claimed in claim 7, is characterized in that, described system also comprises front-mounted pump, and described front-mounted pump is positioned at the outside of described frequency conversion generator, and the input end of front-mounted pump is connected with the output terminal of described frequency conversion generator.
10. method of regulating speed of feedwater in back pressure type small turbine drive feed-water pump, described system comprises the little steam turbine of back pressure type and feed water pump, it is characterized in that, set up frequency conversion generator in described system, by regulating the output of described frequency conversion generator, thereby control the rotating speed of the little steam turbine of described back pressure type, and then control the rotating speed of described feed water pump.
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| CN113107616A (en) * | 2021-04-14 | 2021-07-13 | 湖南省湘电试验研究院有限公司 | BEST small steam turbine system and application method thereof |
| CN113431639A (en) * | 2021-07-28 | 2021-09-24 | 华能秦煤瑞金发电有限责任公司 | Novel water feed pump speed regulating device and method |
| CN113431639B (en) * | 2021-07-28 | 2023-09-29 | 华能秦煤瑞金发电有限责任公司 | Water supply pump speed regulating device and method |
| CN113638776A (en) * | 2021-08-09 | 2021-11-12 | 华能国际电力股份有限公司上海石洞口第一电厂 | Steam extraction back pressure type steam turbine thermodynamic system and control method thereof |
| CN113638776B (en) * | 2021-08-09 | 2023-09-15 | 华能国际电力股份有限公司上海石洞口第一电厂 | Steam extraction back pressure type steam turbine thermodynamic system and control method thereof |
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