CN203394697U - Feed pump system driven by back pressure-type small steam turbine for speed regulation of variable frequency generator - Google Patents
Feed pump system driven by back pressure-type small steam turbine for speed regulation of variable frequency generator Download PDFInfo
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- CN203394697U CN203394697U CN201320494115.1U CN201320494115U CN203394697U CN 203394697 U CN203394697 U CN 203394697U CN 201320494115 U CN201320494115 U CN 201320494115U CN 203394697 U CN203394697 U CN 203394697U
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Abstract
The utility model provides a feed pump system driven by a back pressure-type small steam turbine for speed regulation of a variable frequency generator, and a steam generator set. The system comprises a back pressure-type small steam turbine, a feed pump and a variable frequency generator, wherein the back pressure-type small steam turbine, the feed pump group and the variable frequency generator are coaxially connected. The rotating speed of the back pressure-type small steam turbine is controlled by adjusting output of the variable frequency generator, so as to control the rotating speed of the feed pump. By adopting the feed pump system driven by the back pressure-type small steam turbine disclosed by the utility model, the loss of intake throttling of the small steam turbine can be greatly reduced; the operating efficiency is improved; meanwhile, the power capability of the small steam turbine is fully developed; the operating income is increased.
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 feed-water pump of frequency conversion generator speed governing.
Background technique
In large capacity high parameter steam turbine power generation factory, conventionally 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 subsequent technique system.
According to unit load, change, need the respective change of exerting oneself of feed-water pump, the respective change by feed-water pump rotating speed meets conventionally, and feed-water pump rotating speed is determined by the rotating speed of the little steam turbine of back pressure type coaxially connecting.
In order to meet long-term summer unit, completely send out, the nominal output of the little steam turbine of back pressure type is conventionally 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 causing 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 coaxially connected with feed-water pump 4, 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 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.Regulate the aperture of the modulating valve 2 on the little steam turbine admission of back pressure type pipeline 101 to change throttle flow, thereby change the output power of the little steam turbine 1 of back pressure type, and then change 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, there are respectively feed-water pump 4 and front-mounted pump system 5 to be coaxially connected in two axle heads of the little steam turbine 1 of back pressure type, according to rotating speed coupling, need between front-mounted pump system 5 and the output terminal of 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 subsequent technique system.Regulate the aperture of the modulating valve 2 on the little steam turbine 1 admission pipeline 101 of back pressure type to control 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 rotating speed coupling, need between feed-water pump 4 and the output terminal of front-mounted pump system 5, constant-speed ratio gear-box 6 be housed.
In order to meet long-term summer unit, completely send out, the nominal output of the little steam turbine of back pressure type is conventionally 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, conventionally 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 is exerted oneself allowance for (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 mates with feed water pump group power demand, 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 unit low-load, the little steam turbine of back pressure type is exerted oneself and is all underused.The little steam turbine of 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 make full use of again driving feed-water pump that the little steam turbine of back pressure type back pressure type 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, 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.
The utility model first aspect 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 are coaxially connected with frequency conversion generator;
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, 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 frequency conversion generator is connected with current 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, 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 constant-speed ratio gear-box, and described constant-speed ratio gear-box is coaxially 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 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 described little steam turbine of 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, between described front-mounted pump and described feed water pump, be provided with constant-speed ratio gear-box, described constant-speed ratio gear-box is coaxially connected with feed water pump with described front-mounted pump.
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 constant-speed ratio gear-box, and described constant-speed ratio gear-box is coaxially 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 coaxially 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.
The utility model second aspect provides a kind of steam electric power unit, and described generator set disposes the system described in first aspect.
Third aspect present invention provides a kind of method that regulates 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, in described system, set up frequency conversion generator, 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 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. 1～3 are back pressure type small turbine drive feed-water pump schematic diagram in prior art.
Fig. 4 is according to the system flow schematic diagram of the back pressure type small turbine drive feed-water pump of the utility model the first embodiment's frequency conversion generator speed governing.
Fig. 5 is according to the system flow schematic diagram of the back pressure type small turbine drive feed-water pump of the utility model the second embodiment's frequency conversion generator speed governing.
Fig. 6 is according to the system flow schematic diagram of the back pressure type small turbine drive feed-water pump of the utility model the 3rd embodiment's frequency conversion generator speed governing.
Fig. 7 is according to the system flow schematic diagram of the back pressure type small turbine drive feed-water pump of the utility model the 4th embodiment's frequency conversion generator speed governing.
Fig. 8 is according to the system flow schematic diagram of the back pressure type small turbine drive feed-water pump of the utility model the 5th embodiment's frequency conversion generator speed governing.
Fig. 9 is according to the system flow schematic diagram of the back pressure type small turbine drive feed-water pump of the utility model the 6th embodiment's frequency conversion generator speed governing.
Embodiment
Inventor is through deeply research widely, discovery is by being coaxially connected frequency conversion generator with 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 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 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 model utility of the present invention.
As used herein, for the generator that " frequency conversion generator " refers to respect to conventional power generation usage is fixed frequency, the frequency of generating is at any time at the generator changing 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, " being coaxially connected " refers to that each equipment connection is on same rotation axis system.
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 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 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 5%-20%, saves 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 utility model makes full use 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, and direct economy income is more than 15,000,000 yuan.
Below with reference to accompanying drawing, preferred embodiment of the present utility model is elaborated, so that clearer, understands the purpose of this utility model, feature and advantage.It should be understood that embodiment shown in the drawings is not the restriction to the utility model scope, and just for the connotation of technical solutions of the utility model is described.
Fig. 4～9 are respectively 6 embodiments' of back pressure type small turbine drive feed-water pump of the utility model frequency conversion generator speed governing system flow schematic diagram.The back pressure type small turbine drive feed-water pump of frequency conversion generator speed governing is comprised of several major parts such as the little steam turbine 100 of back pressure type, feed water pump 4 or feed water pump group 200, variable-frequency power generation system 300 and constant-speed ratio gear-boxes 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 constant-speed ratio gear-box 6 coaxially connect.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 the utility model frequency conversion generator speed governing.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 subsequent technique system.
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 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, between little steam turbine 1 and frequency conversion generator 7, can match as required constant-speed ratio gear-box 6.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) mate with electrical network, supply Chang Neihuo factory external power grid.If voltage is different between frequency conversion generator and electrical network, transformer 9 can be set, by electricity transformation to the voltage mating with electrical network.
By regulating the excitation system of frequency conversion generator 7 to change its load, thereby the total load that little steam turbine 1 is born 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, 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 Fig. 5 is identical, different with first embodiment's basic functional principle shown in Fig. 4, 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 turbine 1.Between feed water pump 4 and frequency conversion generator 7, can match as required constant-speed ratio gear-box 6.
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 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) mate with electrical network, supply Chang Neihuo factory external power grid.If voltage is different between frequency conversion generator and electrical network, transformer 9 can be set, by electricity transformation to the voltage mating with electrical network.
When generator set load becomes large or diminishes, the excitation system of adjusting 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 becomes the rotating speed that causes little steam turbine 1 large or diminishes, the rotating speed of feed water pump 4 correspondingly becomes large or diminishes, thereby meets the requirement of generator set working conditions change.
The utility model shown in Fig. 6-8 third and fourth, five embodiments are identical with the basic functional principle of first and second embodiment shown in Fig. 4, Fig. 5, feed water pump group 200 comprises feed water pump 4 and front-mounted pump 5.
As shown in Figure 6, in the 3rd embodiment of the present utility model, feed water pump group 200 is coaxially arranged in the different output terminals of little steam turbine 1 respectively 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 is near the output terminal of little steam turbine 1, and what between feed water pump 4 and front-mounted pump 5, according to rotating speed, mate need to configure suitable constant-speed ratio gear-box 6.And at the opposite side of little steam turbine 1, between little steam turbine 1 and frequency conversion generator 7, can match as required constant-speed ratio gear-box 6.
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 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) mate with electrical network, supply Chang Neihuo factory external power grid.If voltage is different between frequency conversion generator and electrical network, transformer 9 can be set, by electricity transformation to the voltage mating with electrical network.
When generator set load becomes large or diminishes, regulate the excitation system of frequency conversion generator 7 its load is diminished or become 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 being directly connected with little steam turbine 1 output terminal correspondingly becomes large or diminishes, the rotating speed of front-mounted pump 5 also according to the corresponding demagnification of reduction speed ratio of constant-speed ratio gear-box become large or diminish, thereby meet the requirement of generator set working conditions change.
As shown in Figure 7, in the 4th embodiment of the present utility model, feed water pump group 200 is coaxially arranged in the same output terminal of little steam turbine 1 with variable-frequency power generation system 300, and feed water pump 4 is directly connected with little steam turbine 1 output terminal, and frequency conversion generator 7 is coaxially arranged between feed water pump 4 and front-mounted pump 5.According to rotating speed coupling, need between feed water pump 4 and front-mounted pump 5, constant-speed ratio gear-box 6 be installed, in the present embodiment shown in Fig. 7, constant-speed ratio gear-box 6 is coaxially arranged between feed water pump 4 and frequency conversion generator 7.According to actual conditions, change requirement, constant-speed ratio gear-box 6 also can be coaxially arranged between frequency conversion generator 7 and front-mounted pump 5, and 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 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 regulate the rotating speed of front-mounted pump 5 and feed water pump 4 to make it to meet working conditions change requirement.
As shown in Figure 8, in the 5th embodiment of the present utility model, feed water pump group 200 is coaxially arranged in the same output terminal of little steam turbine 1 with variable-frequency power generation system 300, and feed water pump 4 is directly connected with little steam turbine 1 output terminal, and front-mounted pump 5 is coaxially arranged between feed water pump 4 and frequency conversion generator 7.According to 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 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 regulate the rotating speed of front-mounted pump 5 and feed water pump 4 to make it to meet working conditions change requirement.
The 6th embodiment shown in Fig. 9 is identical, different with first embodiment's basic functional principle shown in Fig. 4, between frequency conversion generator 7 and little steam turbine 1, can match as required clutch 11.Clutch 11 plays the function of constant-speed ratio gear-box while connecting, when clutch 11 disconnects, variable-frequency power generation system 300 is 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 utility model is for 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 being connected of back pressure type small turbine drive feed water pump group, by what control frequency conversion generator, exert oneself to regulate speed of feedwater, not only can reduce the loss of little steam turbine admission throttling, and can make full use 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 utility model, 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 mark coal year more than 5000 tons, can significantly reduce operating cost, and reach the comprehensive benefit that reduces pollutant emission; In addition, can make full use of the acting ability of small turbine, by frequency conversion generator, generate electricity, can externally power 7,500 ten thousand kilowatts more every year, direct economy income is more than 1,500 ten thousand yuan.
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 feed-water pump for 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 are coaxially connected with frequency conversion generator;
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 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 constant-speed ratio gear-box, and described constant-speed ratio gear-box is coaxially 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 constant-speed ratio gear-box, and described constant-speed ratio gear-box is coaxially 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 coaxially 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. 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 |
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| CN201320494115.1U CN203394697U (en) | 2013-08-13 | 2013-08-13 | Feed pump system driven by back pressure-type small steam turbine for speed regulation of variable frequency generator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320494115.1U CN203394697U (en) | 2013-08-13 | 2013-08-13 | Feed pump system driven by back pressure-type small steam turbine for speed regulation of variable frequency generator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103397917A (en) * | 2013-08-13 | 2013-11-20 | 中国电力工程顾问集团华东电力设计院 | Back-pressure car driving water-feeding pump system and method adopting variable-frequency power generator for speed regulation |
| CN106655625A (en) * | 2017-03-09 | 2017-05-10 | 上海申能电力科技有限公司 | Generalized frequency conversion system with forepump |
| CN108894965A (en) * | 2018-07-11 | 2018-11-27 | 广州智光电气技术有限公司 | Feed pump control system |
-
2013
- 2013-08-13 CN CN201320494115.1U patent/CN203394697U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103397917A (en) * | 2013-08-13 | 2013-11-20 | 中国电力工程顾问集团华东电力设计院 | Back-pressure car driving water-feeding pump system and method adopting variable-frequency power generator for speed regulation |
| CN106655625A (en) * | 2017-03-09 | 2017-05-10 | 上海申能电力科技有限公司 | Generalized frequency conversion system with forepump |
| CN108894965A (en) * | 2018-07-11 | 2018-11-27 | 广州智光电气技术有限公司 | Feed pump control system |
| CN108894965B (en) * | 2018-07-11 | 2024-08-13 | 广州智光电气技术有限公司 | Water supply pump control system |
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