CN204941618U - The back pressure type small turbine drive blower fan system of double-fed generator speed governing - Google Patents
The back pressure type small turbine drive blower fan system of double-fed generator speed governing Download PDFInfo
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- CN204941618U CN204941618U CN201520657191.9U CN201520657191U CN204941618U CN 204941618 U CN204941618 U CN 204941618U CN 201520657191 U CN201520657191 U CN 201520657191U CN 204941618 U CN204941618 U CN 204941618U
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Abstract
The utility model discloses a kind of back pressure type small turbine drive blower fan system of double-fed generator speed governing, this system comprises the little steam turbine of back pressure type, blower fan, double-fed generator and constant-speed ratio gear-box.Wherein, the little steam turbine of back pressure type, blower fan, double-fed generator are coaxially connected with constant-speed ratio gear-box.By controlling the output of double-fed generator, then control the rotating speed of the little steam turbine of back pressure type, thus control the rotating speed of blower fan.System of the present utility model considerably reduces the loss of little steam turbine admission throttling, improves operational efficiency, and has given full play to the acting ability of little steam turbine, increases and runs income.
Description
Technical field
The utility model relates to the field of energy-saving technology of power generation system, particularly, relates to a kind of back pressure type small turbine drive blower fan system of double-fed generator speed governing.
Background technique
In Large Copacity high-parameter steam turbine power station, usually can configure steam-operating blower fan, use small turbine drive blower fan, the working medium such as air, flue gas or combustion gas are improved pressure, to supply subsequent technique system.This small turbine can adopt back pressure type.And blower fan exert oneself according to unit load change make respective change, usual rotation speed of fan is determined by the rotating speed of the little steam turbine coaxially connected.
Completely send out to meet summer long-term unit, the nominal output of little steam turbine is usually large than the nominal output of blower fan, and the nominal output of blower fan is larger than exerting oneself required for unit rated load, therefore the nominal output of little steam turbine has larger allowance, is generally more than 50%.In prior art, little steam turbine configuration admission modulating valve, by the aperture of modulating valve, can control the rotating speed of little steam turbine.This configuration causes little steam turbine admission modulating valve aperture most of working time less, causes restriction loss.In addition, due to generator set load with electrical network demand every day in lifting, when low-load, the tune valve opening of little steam turbine can be less, and restriction loss is larger, and can not give full play to due to the ability of the acting of little steam turbine, therefore also there is relatively large economic loss.
Therefore, how for the throttle grverning problem of existing back pressure type small turbine drive blower fan system, develop a kind of loss that effectively can reduce little steam turbine admission throttling, can make full use of again the driving blower fan system that little steam turbine exerts oneself is that current steam turbine power generation factory is in energy-saving field problem demanding prompt solution.
Model utility content
The purpose of this utility model is to provide a kind of back pressure type small turbine drive blower fan system reducing the double-fed generator speed governing of restriction loss.
First aspect of the present utility model provides a kind of back pressure type small turbine drive blower fan system of double-fed generator speed governing, described system comprises the little steam turbine of back pressure type, blower fan, double-fed generator and constant-speed ratio gear-box, wherein, the little steam turbine of described back pressure type, blower fan, double-fed generator are coaxially connected with constant-speed ratio gear-box.
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 output terminal of the little steam turbine of back pressure type is connected with the input end of the equipment such as heater, heat supply network.
In another preference, described double-fed generator is connected with electrical network.
In another preference, between double-fed generator and electrical network, be furnished with transformer, make electricity transformation to the voltage mated with electrical network.
In another preference, the axle head of described blower fan and double-fed generator steam turbine both sides little of described back pressure type is respectively connected.
In another preference, described system is provided with two constant-speed ratio gear-boxes, and it lays respectively between the little steam turbine of described back pressure type and double-fed generator, and between the little steam turbine of described back pressure type and blower fan.
In another preference, described blower fan and double-fed generator are connected to the same axle head of the little steam turbine of described back pressure type.
In another preference, described constant-speed ratio gear-box between described little steam turbine and double-fed generator, or
Described constant-speed ratio gear-box is between described blower fan and double-fed generator.
In another preference, the axle head of described blower fan and double-fed generator steam turbine both sides little of described back pressure type is respectively connected, described constant-speed ratio gear-box between the little steam turbine of described back pressure type and blower fan, and is provided with clutch between the little steam turbine of described back pressure type and double-fed generator.
In another preference, described blower fan comprises: compressor, gas turbine that the blower fan that medium is air or flue gas, medium are air or combustion gas.
Accompanying drawing explanation
Fig. 1 is existing back pressure type small turbine drive blower fan system schematic diagram.
Fig. 2 is the system schematic of the utility model embodiment 1.
Fig. 3 is the system schematic of the utility model embodiment 2.
Fig. 4 is the system schematic of the utility model embodiment 3.
Fig. 5 is the system schematic of the utility model embodiment 4.
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, tiredly no longer one by one to state at this.
Embodiment
The utility model people through research extensive and deep for a long time, by a large amount of screening and test, a kind of back pressure type small turbine drive blower fan system of double-fed generator speed governing of Late Cambrian.This system comprises the little steam turbine of back pressure type, blower fan, double-fed generator and constant-speed ratio gear-box.By controlling the output of described double-fed generator, then control the rotating speed of the little steam turbine of back pressure type, thus control the rotating speed of blower fan.System of the present utility model considerably reduces the loss of little steam turbine admission throttling, improves operational efficiency, and has given full play to the acting ability of little steam turbine, increases and runs income.Complete the utility model on this basis.
As used herein, " double-fed generator " refers to ac excited generator, and rotor side adopts Ac excitation.The driving arrangement of speed change drives double-fed generator, can send the power frequency electric of constant frequency.
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.
Major advantage of the present utility model comprises:
(1) the common aperture of the little steam turbine regulating valve of back pressure type in current system can be made to be increased to 100% from less than 50%, and high aperture level can being kept for a long time, significantly reducing the loss that throttling causes because matching with driving arrangement power demand of little steam turbine.
(2) operational efficiency of the little steam turbine of back pressure type of the present utility model can improve more than 8%, saves mark more than 4000 tons, coal every platform 1000MW unit year, significantly reduces operating cost, and reach the comprehensive benefit of decreasing pollution thing discharge.
(3) system of the present utility model makes full use of the acting ability of little steam turbine, is generated electricity by double-fed generator, and every platform 1000MW unit can externally be powered 6,000 ten thousand kilowatts every year, direct economy income more than 1,200 ten thousand yuan.
Below in conjunction with specific embodiment, set forth the utility model further.Should be understood that these embodiments are only not used in restriction scope of the present utility model for illustration of the utility model.The experimental technique of unreceipted actual conditions in the following example, usually conveniently condition, or according to the condition that manufacturer advises.Unless otherwise indicated, otherwise percentage and number are weight percentage and parts by weight.
Embodiment 1
As shown in Figure 2.During normal operation, the little steam turbine of back pressure type adjusts valve to keep comparatively large (or standard-sized sheet) aperture, and high pressure steam enters little steam turbine, and the low pressure steam discharge after acting is to the heat user such as heater, heat supply network, Steam Actuation small turbine rotates, thus drags coaxial blower fan rotation.Constant-speed ratio gear-box is furnished with between little steam turbine and blower fan.The little steam turbine of back pressure type as required, can be joined more than 0,1,2 or 2 grade and draws gas, for the heat user such as heater, heat supply network.
Another axle head of the little steam turbine of back pressure type drags double-fed generator, is furnished with constant-speed ratio gear-box between little steam turbine and double-fed generator.The power frequency electric that double-fed generator sends supplies in factory or factory's external power grid.If voltage is different between double-fed generator from electrical network, can transformer be set, by electricity transformation to the voltage mated with electrical network.
By controlling exerting oneself of double-fed generator, modulating valve throttle style can be replaced, controlling the rotating speed of small turbine, thus efficiently meeting rotation speed of fan control overflow.
Embodiment 2
As shown in Figure 3.The technological scheme of the present embodiment is identical with the basic principle of accompanying drawing 2 scheme.Difference is, double-fed generator and blower fan are positioned at the same axle head of little steam turbine, and double-fed generator is between little steam turbine and blower fan.And between little steam turbine and double-fed generator, be furnished with constant-speed ratio gear-box.
Embodiment 3
As shown in Figure 4.The technological scheme of the present embodiment is identical with the basic principle of accompanying drawing 3 scheme.Difference is, double-fed generator and blower fan are positioned at the same axle head of little steam turbine, and double-fed generator is between little steam turbine and blower fan.Constant-speed ratio gear-box is furnished with between double-fed generator and blower fan.
Embodiment 4
As shown in Figure 5.The technological scheme of the present embodiment is identical with the basic principle of accompanying drawing 2 scheme.Difference is, between little steam turbine and double-fed generator, be furnished with clutch.
The all documents mentioned at the utility model 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 utility model, 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 utility model.
Reference character:
A1. little steam turbine
A2. constant-speed ratio gear-box
A3. blower fan (or air compressor)
A5. modulating valve
A6. transformer
A7. clutch
G. double-fed generator
Claims (9)
1. the back pressure type small turbine drive blower fan system of a double-fed generator speed governing, it is characterized in that, described system comprises the little steam turbine of back pressure type, blower fan, double-fed generator and constant-speed ratio gear-box, and wherein, the little steam turbine of described back pressure type, blower fan, double-fed generator are coaxially connected with constant-speed ratio gear-box.
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 double-fed generator is connected with electrical network.
4. the system as claimed in claim 1, is characterized in that, the axle head of described blower fan and double-fed generator steam turbine both sides little of described back pressure type is respectively connected.
5. system as claimed in claim 4, it is characterized in that, described system is provided with two constant-speed ratio gear-boxes, and it lays respectively between the little steam turbine of described back pressure type and double-fed generator, and between the little steam turbine of described back pressure type and blower fan.
6. the system as claimed in claim 1, is characterized in that, described blower fan and double-fed generator are connected to 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 constant-speed ratio gear-box between described little steam turbine and double-fed generator, or
Described constant-speed ratio gear-box is between described blower fan and double-fed generator.
8. the system as claimed in claim 1, it is characterized in that, the axle head of described blower fan and double-fed generator steam turbine both sides little of described back pressure type is respectively connected, described constant-speed ratio gear-box between the little steam turbine of described back pressure type and blower fan, and is provided with clutch between the little steam turbine of described back pressure type and double-fed generator.
9. the system as claimed in claim 1, is characterized in that, described blower fan comprises: compressor, gas turbine that the blower fan that medium is air or flue gas, medium are air or combustion gas.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520657191.9U CN204941618U (en) | 2015-08-27 | 2015-08-27 | The back pressure type small turbine drive blower fan system of double-fed generator speed governing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520657191.9U CN204941618U (en) | 2015-08-27 | 2015-08-27 | The back pressure type small turbine drive blower fan system of double-fed generator speed governing |
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| CN204941618U true CN204941618U (en) | 2016-01-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113090540A (en) * | 2021-04-08 | 2021-07-09 | 西安热工研究院有限公司 | Direct air cooling unit feedwater and condensate water cooperative system based on double-fed system |
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2015
- 2015-08-27 CN CN201520657191.9U patent/CN204941618U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113090540A (en) * | 2021-04-08 | 2021-07-09 | 西安热工研究院有限公司 | Direct air cooling unit feedwater and condensate water cooperative system based on double-fed system |
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