CN103397917B - The back pressure type small turbine drive feed-water pump of frequency conversion generator speed governing and method - Google Patents
The back pressure type small turbine drive feed-water pump of frequency conversion generator speed governing and method Download PDFInfo
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Abstract
The invention provides a kind of back pressure type small turbine drive feed-water pump and method of frequency conversion generator speed governing.This system comprises the little steam turbine of back pressure type, feed water pump and frequency conversion generator, and wherein, the little steam turbine of back pressure type, feed water pump are coaxially connected with frequency conversion generator.By regulating the output of frequency conversion generator, thus control the rotating speed of the little steam turbine of back pressure type, and then control the rotating speed of feed water pump.Back pressure type small turbine drive feed-water pump of the present invention can reduce the loss of little steam turbine admission throttling, improves operational efficiency, gives full play to the acting ability of little steam turbine simultaneously, increases and runs income.
Description
Technical field
The present invention relates to the field of energy-saving technology of power generation system, relate to a kind of back pressure type small turbine drive feed-water pump and method of frequency conversion generator speed governing particularly.
Background technique
In Large Copacity high-parameter steam turbine power station, configuration steam feed pump system group usually.These feed-water pump groups are driven by the such as little steam turbine of back pressure type, and feedwater is improved pressure, supply subsequent technique system.
According to unit load change, need the respective change of exerting oneself of feed-water pump, usually met by the respective change of feed-water pump rotating speed, and feed-water pump rotating speed is determined by the rotating speed of the little steam turbine of the back pressure type coaxially connected.
Completely send out 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 larger than exerting oneself required for unit rated load, therefore the nominal output of the little steam turbine of back pressure type has larger allowance, is generally more than 20%.In prior art, back pressure type little steam turbine configuration admission modulating valve, by the aperture of modulating valve, can control the rotating speed of the little steam turbine of back pressure type.But this configuration causes back pressure type little steam turbine admission modulating valve aperture most working time less, causes restriction loss.
In addition, due to the load of generator set with electrical network demand every day all in continuous change, it is low that load has height to have, and therefore when low-load, the aperture of the admission modulating valve of the little steam turbine of back pressure type can be less, thus the restriction loss caused is larger.And because the ability of the acting of the little steam turbine of back pressure type can not give 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, and the admission pipeline 101 of the little steam turbine of back pressure type is equipped with modulating valve 1.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, thus drags coaxial feed-water pump 4 and rotate, the low pressure steam discharge after acting or draw gas blow-off line 102 or extraction line 3.Feed-water pump 4 makes the pressure of feedwater improve, supply 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 back pressure type little steam turbine admission pipeline 101 to change throttle flow, thus 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 made up of front-mounted pump system 5 and feed-water pump 4, feed-water pump 4 and front-mounted pump system 5 is had coaxially to be connected to two axle heads of the little steam turbine 1 of back pressure type respectively, 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 is 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, thus drags coaxial feed-water pump 4 and front-mounted pump system 5 is rotated, and front-mounted pump system 5 and feed-water pump 4 successively make the pressure of feedwater improve, supply subsequent technique system.The aperture of the modulating valve 2 on back pressure type little steam turbine 1 admission pipeline 101 is regulated 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 with working principle and Fig. 2 similar, unlike, 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 is housed.
Completely send out 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 larger than exerting oneself required for unit rated load, therefore the nominal output of the little steam turbine of back pressure type has larger allowance, is generally more than 20%.In prior art, back pressure type little steam turbine configuration admission modulating valve, by the aperture of modulating valve, can control the rotating speed of the little steam turbine of back pressure type.
Such as to 1 1000MW steam electric power unit, the automobile assembly welding Iine of configuration 2 50% capacity usually.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 the little steam turbine of every platform unit back pressuce formula exerts oneself allowance for (22000-17000) x2=10000kW.This completely sends out summer all the year round to meet unit and configure.
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, there is obvious restriction loss with feed water pump group power demand.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 more than 5% of back pressure type;
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 platform unit does not on average utilize power to be 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 effectively can reduce back pressure type little steam turbine admission throttling, can make full use of again the driving feed-water pump that the little steam turbine of back pressure type back pressure type exerts oneself is that current steam turbine power generation factory is in energy-saving field problem demanding prompt solution.
Summary of the invention
The object of the present invention is to provide a kind of restriction loss little, little steam turbine is exerted oneself the back pressure type small turbine drive feed-water pump of the high frequency conversion generator speed governing of utilization ratio.
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 are coaxially connected with frequency conversion generator;
By regulating the output of described frequency conversion generator, thus 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 outlet of drawing gas;
In another preference, described in draw gas outlet be connected with high temperature heat source heater or heat exchanger by extraction line;
In another preference, described extraction line comprises n level extraction line, described n=1,2,3,4,5 or 6.
In another preference, the output terminal of described 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 aperture of described modulating valve keeps high aperture for a long time, and the scope of aperture is 70%-100%.
In another preference, the axle head of described feed water pump and frequency conversion generator steam turbine both sides little of described back pressure type is respectively connected.
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 the 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 to 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 constant-speed ratio gear-box between described front-mounted pump and described feed water pump, 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 to 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 the 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.
Second aspect present invention provides a kind of steam electric power unit, and described generator set is configured with the system described in first aspect.
Third aspect present invention provides a kind of method regulating 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 the system, by regulating the output of described frequency conversion generator, thus 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.
Should be understood that within the scope of the present invention, above-mentioned each technical characteristics of the present invention and can combining mutually between specifically described each technical characteristics in below (eg embodiment), thus form new or preferred technological scheme.As space is limited, tiredly no longer one by one to state at this.
Accompanying drawing explanation
Fig. 1 ~ 3 are back pressure type small turbine drive feed-water pump schematic diagram in prior art.
Fig. 4 is the system flow schematic diagram of the back pressure type small turbine drive feed-water pump of frequency conversion generator speed governing according to a first embodiment of the present invention.
Fig. 5 is the system flow schematic diagram of the back pressure type small turbine drive feed-water pump of frequency conversion generator speed governing according to a second embodiment of the present invention.
Fig. 6 is the system flow schematic diagram of the back pressure type small turbine drive feed-water pump of frequency conversion generator speed governing according to a third embodiment of the present invention.
Fig. 7 is the system flow schematic diagram of the back pressure type small turbine drive feed-water pump of frequency conversion generator speed governing according to a fourth embodiment of the present invention.
Fig. 8 is the system flow schematic diagram of the back pressure type small turbine drive feed-water pump of frequency conversion generator speed governing according to a fifth embodiment of the present invention.
Fig. 9 is the system flow schematic diagram of the back pressure type small turbine drive feed-water pump of frequency conversion generator speed governing according to a sixth embodiment of the present invention.
Embodiment
Inventor is through deeply studying widely, find by being coaxially connected frequency conversion generator with the little steam turbine of back pressure type, not only by controlling the mode of exerting oneself of frequency conversion generator, part or all of replacement modulating valve mode, to control the rotating speed of little steam turbine, thus control the rotating speed of feed water pump, and frequency conversion generator can be utilized to generate electricity, thus take full advantage of exerting oneself of little steam turbine.The aperture of the modulating valve of the little steam turbine of the present invention can keep high aperture (open range is 70%-100%) for a long time, and greatly reduce the loss that throttling causes, and make full use of exerting oneself of little steam turbine, what make the operational efficiency of little steam turbine improves 8%-20%.Complete the present invention on this basis.
As used herein, " frequency conversion generator " refer to be fixed frequency relative to conventional power generation usage generator for, the generator that the frequency of generating is changing at any time 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 present invention has following major advantage:
(1) the common aperture of the little steam turbine regulating valve of back pressure type in current system is increased to 70%-100% from less than 60%, and high aperture level can being kept for a long time, significantly reducing the loss that throttling causes because matching with driving arrangement power demand of little steam turbine.
(2) operational efficiency of the little steam turbine of back pressure type of the present invention can improve 5%-20%, saves mark more than 5000 tons, coal every platform 1000MW unit year, significantly reduces operating cost, and reach the comprehensive benefit of decreasing pollution thing discharge.
(3) system of the present invention makes full use of the acting ability of little steam turbine, is generated electricity by frequency conversion generator, and every platform 1000MW unit can externally be powered 7,500 ten thousand kilowatts every year, direct economy income more than 1,500 ten thousand yuan.
Below with reference to accompanying drawing, preferred embodiment of the present invention is described in detail, 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 the connotation just in order to technical solution of the present invention is described.
Fig. 4 ~ 9 are respectively the system flow schematic diagram of back pressure type small turbine drive feed-water pump 6 embodiments of frequency conversion generator speed governing of the present invention.The back pressure type small turbine drive feed-water pump of frequency conversion generator speed governing is made up of a few 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 of back pressure type 100 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 some embodiments, 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.This technology also can be applicable to other high powered water pumps.
Fig. 4 illustrates the system flow chart of the first embodiment 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 comparatively large (even standard-sized sheet) aperture, high pressure steam enters little steam turbine 1, the little steam turbine 1 of Steam Actuation rotates, thus drag coaxial feed water pump 4 at an output terminal of the little steam turbine of back pressure type and rotate, 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 makes the pressure of feedwater improve, supply subsequent technique system.
In system of the present invention, the little steam turbine of back pressure type also can comprise outlet of drawing gas, and the little steam turbine of back pressure type can as required, configuration extraction line 3.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 constant-speed ratio gear-box 6 as required 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 fully or partially through current transformer 8, can become the power frequency electric (frequency is generally 50Hz or 60Hz) of mating with electrical network, in supply factory or factory's external power grid.If voltage is different between frequency conversion generator from electrical network, transformer 9 can be set, by electricity transformation to the voltage mated with electrical network.
Its load is changed by regulating the excitation system of frequency conversion generator 7, thus the total load making little steam turbine 1 bear changes, because the throttle flow of little steam turbine 1 is constant, the change of total load will cause the rotation speed change of little steam turbine 1, and then meet the rotation speed requirements of 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, partly or entirely can replace modulating valve 2 throttle style, controlling the rotating speed of little steam turbine 1, thus while meeting feed water pump 4 rotating speed control overflow, improve the operational efficiency of the little steam turbine of back pressure type.
The second embodiment shown in Fig. 5 is identical with first embodiment's basic functional principle shown in Fig. 4, unlike, variable-frequency power generation system 300 is connected with feed water pump 4 is coaxial the same output terminal being arranged in little steam turbine 1, and wherein, feed water pump 4 is near the output terminal of little steam turbine 1.Constant-speed ratio gear-box 6 can be matched as required 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 comparatively 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, thus dragging feed water pump 4 and frequency conversion generator 7 rotate simultaneously.Feed water pump 4 makes the pressure of feedwater improve, supply 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 fully or partially through current transformer 8, can become the power frequency electric (frequency is generally 50Hz or 60Hz) of mating with electrical network, in supply factory or factory's external power grid.If voltage is different between frequency conversion generator from electrical network, transformer 9 can be set, by electricity transformation to the voltage mated with electrical network.
Generator set load becomes large or when diminishing, regulate the excitation system of frequency conversion generator 7 to change its load diminish or become large, thus 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 change of total load becomes large by causing the rotating speed of little steam turbine 1 or diminishes, the rotating speed of feed water pump 4 correspondingly becomes large or diminishes, thus meets the requirement of generator set working conditions change.
The present invention 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 third embodiment of the present invention, feed water pump group 200 and variable-frequency power generation system 300 are coaxially arranged in the different output terminals of little steam turbine 1 respectively.In the feed water pump group 200 of little steam turbine 1 side, feed water pump 4, near the output terminal of little steam turbine 1, configures suitable constant-speed ratio gear-box 6 according to needing of mating of rotating speed between feed water pump 4 with front-mounted pump 5.And at the opposite side of little steam turbine 1, between little steam turbine 1 and frequency conversion generator 7, constant-speed ratio gear-box 6 can be matched as required.
During normal operation, the modulating valve 2 of the little steam turbine 100 of back pressure type keeps comparatively 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, thus dragging feed water pump group 200 and frequency conversion generator 7 rotate simultaneously.Enter after feed water pump 4 carries out two-stage pressurizing through the water of front-mounted pump 5 one-level pressurization, supply 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 fully or partially through current transformer 8, can become the power frequency electric (frequency is generally 50Hz or 60Hz) of mating with electrical network, in supply factory or factory's external power grid.If voltage is different between frequency conversion generator from electrical network, transformer 9 can be set, by electricity transformation to the voltage mated with electrical network.
Generator set load becomes large or when diminishing, the excitation system of frequency conversion generator 7 is regulated its load to be diminished or becomes large, thus make little steam turbine 1 output terminal total load diminish or become large, and then make the rotating speed of little steam turbine 1 become large or diminish, the rotating speed of the feed water pump 4 be 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 constant-speed ratio gear-box the corresponding demagnification of reduction speed ratio become large or diminish, thus meet 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 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 to install in the present embodiment shown in constant-speed ratio gear-box 6, Fig. 7 between feed water pump 4 and front-mounted pump 5, 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 rotates dragging 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, part or all of replacement modulating valve 2 throttle style, control the rotating speed of little steam turbine 1, thus 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 fifth embodiment of the present invention, 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, constant-speed ratio gear-box 6 is installed between feed water pump 4 and front-mounted pump 5.
With above embodiment similarly, little steam turbine 1 rotates dragging 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, part or all of replacement modulating valve 2 throttle style, control the rotating speed of little steam turbine 1, thus regulate the rotating speed of front-mounted pump 5 and feed water pump 4 to make it to meet working conditions change requirement.
First embodiment's basic functional principle shown in the 6th embodiment with Fig. 4 shown in Fig. 9 is identical, unlike, clutch 11 can be matched as required between frequency conversion generator 7 and little steam turbine 1.Clutch 11 plays the function of constant-speed ratio gear-box when 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 gets 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 the frequency conversion generator be coaxially connected with back pressure type small turbine drive feed water pump group, speed of feedwater is regulated by controlling exerting oneself of frequency conversion generator, not only can reduce the loss of little steam turbine admission throttling, and exerting oneself of little steam turbine can be made full use of, by the multiple electricity of frequency conversion generator, improve the sale of electricity income of power plant.
To 1 1000MW ultra supercritical unit, adopt the present invention, the control valve opening of little steam turbine can remain on large aperture even 100% full gate for a long time, remarkable minimizing restriction loss, little steam turbine operational efficiency improves more than 5%, save mark more than 5000 tons, coal year, significantly can reduce operating cost, and reach the comprehensive benefit of decreasing pollution thing discharge; In addition, the acting ability of small turbine can be made full use of, generated electricity by frequency conversion generator, can externally power 7,500 ten thousand kilowatts morely every year, direct economy income more than 1,500 ten thousand yuan.
The all documents mentioned in the present invention are quoted as a reference all in this application, are just quoted separately as a reference as each section of document.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after having read above-mentioned instruction content of the present invention.
Claims (6)
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; Described feed water pump and frequency conversion generator are connected to the same axle head of the little steam turbine of described back pressure type; And
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; Wherein
The little steam turbine of described back pressure type is provided with admission pipeline, and described admission pipeline is provided with modulating valve, and during system cloud gray model, the open range of described modulating valve is 70%-100%;
By regulating the output of described frequency conversion generator, thus 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 blow-off line, and described blow-off line is connected with heat exchanger.
3. the system as claimed in claim 1, is characterized in that, the little steam turbine of described back pressure type also comprises outlet of drawing gas, described in draw gas outlet be connected with heat exchanger by extraction line.
4. the system as claimed in claim 1, 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.
5. the system as claimed in claim 1, 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.
6. one kind regulates the method for 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, the little steam turbine of described back pressure type is provided with admission pipeline, described admission pipeline is provided with modulating valve, during system cloud gray model, the open range of described modulating valve is 70%-100%;
It is characterized in that, set up frequency conversion generator in the system, described feed water pump and frequency conversion generator are connected to the same axle head of the little steam turbine of described back pressure type; And
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; Wherein
By regulating the output of described frequency conversion generator, thus 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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| CN203394697U (en) * | 2013-08-13 | 2014-01-15 | 中国电力工程顾问集团华东电力设计院 | Feed pump system driven by back pressure-type small steam turbine for speed regulation of variable frequency generator |
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