CN211692590U - Take power balance generator's little steam turbine control governing system of back pressure type of drawing steam - Google Patents
Take power balance generator's little steam turbine control governing system of back pressure type of drawing steam Download PDFInfo
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- CN211692590U CN211692590U CN201921906318.0U CN201921906318U CN211692590U CN 211692590 U CN211692590 U CN 211692590U CN 201921906318 U CN201921906318 U CN 201921906318U CN 211692590 U CN211692590 U CN 211692590U
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Abstract
The utility model relates to a steam extraction back pressure type small steam turbine control and regulation system with a power balance generator, one end of a small steam turbine of a water supply pump of the system is connected with the power balance small generator and is coaxially driven; the other end of the small steam turbine of the feed pump is connected with the input end of a speed regulating device of the feed pump, and the output end of the speed regulating device of the feed pump is connected with the input end of the feed pump; the driving steam of the small turbine of the water feeding pump enters the adjusting end of the small turbine of the water feeding pump through the steam inlet adjusting valve of the small turbine; the middle steam extraction of the small steam turbine of the water supply pump is supplied to the regenerative heater through the regenerative steam extraction regulating valve; the exhaust steam of the small turbine of the water feeding pump is controlled by an exhaust steam regulating valve; the rotating speed control module is connected with a steam inlet regulating valve of the small steam turbine and a water feeding pump speed regulating device. The utility model discloses the entry admission governing valve is opened the operation entirely when can realizing little steam turbine normal operating, and then reduces admission throttle loss to improve about the efficiency 4-5% of little steam turbine, realize energy saving and consumption reduction's purpose.
Description
Technical Field
The utility model belongs to the technical field of thermal power, especially, relate to a take out little steam turbine control governing system of vapour back pressure type of power balance generator.
Background
With higher requirements on the coal-electric unit on energy conservation and emission reduction, innovative research is carried out in the industry aiming at a thermodynamic system of a high-parameter ultra-supercritical unit, particularly a secondary reheating unit.
Because of the improvement of parameters and the use of secondary reheating circulation, the degree of superheat of the regenerative steam extraction of the unit is greatly increased, and a double-unit regenerative system of the steam extraction back pressure type water feeding pump steam turbine unit is provided. Namely, a small turbine driving a water feeding pump is connected with a partial regenerative heater at the same time, and is synchronously pumped back for regenerative heating with a host.
The system has the advantage of fully utilizing the superheat degree of the regenerative extraction steam. But at the same time, the difficulty of operation is increased, and particularly, a new requirement is put on how to ensure energy-saving operation.
Meanwhile, the system is more complicated to regulate and operate compared with a traditional small steam turbine of a feed pump. How to ensure the energy-saving effect of the double-machine regenerative system, the operation control and adjustment method is especially important.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a take little steam turbine control governing system of steam extraction back pressure formula of power balance generator can realize the stable control of little steam turbine drive feed pump flow, ensures the throttle of reducing the steam turbine simultaneously and adjusts the loss.
The utility model provides a steam extraction back pressure type small steam turbine control and regulation system with a power balance generator, which comprises a small water feeding pump steam turbine, a power balance small generator, a water feeding pump speed regulating device, a small steam turbine steam inlet regulating valve, a steam exhaust regulating valve, a backheating steam extraction regulating valve and a rotating speed control module;
one end of the small water feeding pump turbine is connected with the small power balance generator and is coaxially driven, and the residual power for driving the small water feeding pump turbine is used for generating power by the small power balance generator;
the other end of the small steam turbine of the water feed pump is connected with the input end of the speed regulating device of the water feed pump, and the output end of the speed regulating device of the water feed pump is connected with the input end of the water feed pump and is used for coaxially driving the water feed pump by taking the small steam turbine of the water feed pump as a power source through the speed regulating device of the water feed pump;
the driving steam of the small turbine of the water feeding pump enters the adjusting end of the small turbine of the water feeding pump through the steam inlet adjusting valve of the small turbine; the middle steam extraction of the small steam turbine of the water supply pump is supplied to the regenerative heater through the regenerative steam extraction regulating valve; the exhaust steam of the small turbine of the water feeding pump is controlled by an exhaust steam regulating valve;
the rotating speed control module is connected with the small steam turbine steam inlet regulating valve and the water feeding pump speed regulating device and is used for controlling the rotating speed and/or flow of the water feeding pump based on the difference value between the water feeding flow demand and the actual water feeding flow.
By means of the scheme, the steam extraction back pressure type small steam turbine control and regulation system with the power balance generator can achieve full-open operation of the inlet steam inlet regulating valve when the small steam turbine normally operates, further reduce steam inlet throttling loss, improve the efficiency of the small steam turbine by about 4-5%, and achieve the purposes of energy conservation and consumption reduction.
The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of a steam extraction back pressure type small steam turbine control and regulation system with a power balance generator of the utility model.
Reference numbers in the figures:
1-a small steam turbine of a water supply pump; 2-power balance small generator; 3-a water supply pump; 4-a feed pump speed regulating device; 5-steam turbine admission regulating valve; 6-exhaust steam regulating valve; 7-backheating steam extraction regulating valve; 8-rotating speed control module.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
Referring to fig. 1, the present embodiment provides a steam extraction back-pressure type small steam turbine control and regulation system with a power balance generator, which includes a water feed pump small steam turbine 1, a power balance small generator 2, a water feed pump 3, a water feed pump speed regulation device 4, a small steam turbine steam inlet regulation valve 5, a steam exhaust regulation valve 6, a regenerative steam extraction regulation valve 7, and a rotation speed control module 8;
one end of a small water feeding pump turbine 1 is connected with the small power balance generator 2 and is coaxially driven, and the residual power for driving the small water feeding pump turbine is used for generating power by the small power balance generator 2;
the other end of the small water feeding pump turbine 1 is connected with the input end of a water feeding pump speed regulating device 4, the output end of the water feeding pump speed regulating device 4 is connected with the input end of a water feeding pump 3, and the small water feeding pump turbine 1 is used as a power source to coaxially drive the water feeding pump 3 through the water feeding pump speed regulating device 4;
the driving steam of the small turbine 1 of the feed pump enters the adjusting end of the small turbine 1 of the feed pump through the small turbine steam inlet adjusting valve 5; the middle steam extraction of the small steam turbine 1 of the water supply pump is supplied to the regenerative heater through the regenerative steam extraction regulating valve 7; the exhaust steam of the small turbine 1 of the water feeding pump is controlled by an exhaust steam regulating valve 6;
the rotating speed control module 8 is connected with the small turbine steam inlet regulating valve 5 and is used for controlling the steam inlet quantity by controlling the opening of the small turbine steam inlet regulating valve 5 based on the difference value between the water supply flow demand and the actual water supply flow so as to adjust the rotating speed or the output power of the small turbine 1 of the water supply pump and control the rotating speed or the flow of the water supply pump 3;
the rotating speed control module 8 is connected with the water feeding pump speed regulating device 4 and used for controlling the rotating speed and the flow of the water feeding pump 3 through the water feeding pump speed regulating device 4 based on the difference value of the water feeding flow demand and the actual water feeding flow.
The method for controlling and adjusting the steam extraction back pressure type small steam turbine of the system with the power balance generator comprises the following steps:
firstly, when the water feeding pump speed regulating device 4 is in a constant speed state, namely, the speed is not variable, and the water feeding pump small turbine 1 is variable, the difference value between the water feeding flow demand and the actual water feeding flow is judged in the rotating speed control module 8 and is converted into a rotating speed instruction of the water feeding pump small turbine 1 through a function relation, and the instruction can be used for controlling the opening degree of the small turbine steam inlet regulating valve 5, namely, the steam inlet quantity, so that the rotating speed or the output power of the water feeding pump small turbine 1 is regulated, and the rotating speed or the flow of the water feeding pump 3 is driven; under the normal operation condition, the steam inlet regulating valve 5 of the small steam turbine can be kept to operate fully, the residual power of the unit can balance external power generation through the small power balance generator 2, and the back pressure abnormality of the small steam turbine can be regulated and controlled through the steam exhaust regulating valve 6. And secondly, when the small turbine 1 of the feed pump is at a constant speed and the speed of the feed pump speed regulating device 4 can be regulated, the difference between the feed water flow demand and the actual feed water flow is judged in the rotating speed control module 8 and is converted into a rotating speed instruction of the feed pump speed regulating device 4 through a functional relation, so that the rotating speed and the flow of the coaxially driven feed pump 3 are regulated. At the moment, a small turbine steam inlet regulating valve 5 of the small turbine 1 of the water feeding pump can be kept in full-open operation, meanwhile, the residual power of the unit can be balanced to external power generation through the small power balance generator 2, and the back pressure of the small turbine can be regulated and controlled through the steam exhaust regulating valve 6 in an abnormal mode.
In the starting and stopping stage of the whole set of unit, when the small turbine 1 of the water feeding pump does not feed steam, namely the steam inlet regulating valve 5 of the small turbine is closed, in order to ensure a certain water feeding flow, namely the water feeding pump 3 can still work, the small generator 2 with power balance can be connected to the grid to be in a motor mode, and the water feeding pump 3 is coaxially driven to provide necessary water feeding flow.
By the control and regulation system and the control and regulation method, the inlet steam inlet regulating valve 5 can be operated fully when the small steam turbine operates normally, so that the steam inlet throttling loss is reduced, the efficiency of the small steam turbine is improved by about 4-5%, and the purposes of energy conservation and consumption reduction are achieved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (1)
1. The small steam turbine control and regulation system with the power balance generator is characterized by comprising a small water feeding pump steam turbine, a small power balance generator, a water feeding pump speed regulation device, a small steam turbine steam inlet regulation valve, a steam exhaust regulation valve, a backheating steam extraction regulation valve and a rotating speed control module;
one end of the small water feeding pump turbine is connected with the small power balance generator and is coaxially driven, and the residual power for driving the small water feeding pump turbine is used for generating power by the small power balance generator;
the other end of the small steam turbine of the water feed pump is connected with the input end of the speed regulating device of the water feed pump, and the output end of the speed regulating device of the water feed pump is connected with the input end of the water feed pump and used for coaxially driving the water feed pump by using the small steam turbine of the water feed pump as a power source through the speed regulating device of the water feed pump;
the driving steam of the small turbine of the water feeding pump enters the adjusting end of the small turbine of the water feeding pump through the steam inlet adjusting valve of the small turbine; the middle steam extraction of the small turbine of the water supply pump is supplied to the regenerative heater through the regenerative steam extraction regulating valve; the exhaust steam of the small turbine of the water feeding pump is controlled by the exhaust steam regulating valve;
and the rotating speed control module is connected with the small steam turbine steam inlet regulating valve and the water feeding pump speed regulating device and is used for controlling the rotating speed and/or the flow of the water feeding pump based on the difference value between the water feeding flow demand and the actual water feeding flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921906318.0U CN211692590U (en) | 2019-11-06 | 2019-11-06 | Take power balance generator's little steam turbine control governing system of back pressure type of drawing steam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921906318.0U CN211692590U (en) | 2019-11-06 | 2019-11-06 | Take power balance generator's little steam turbine control governing system of back pressure type of drawing steam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211692590U true CN211692590U (en) | 2020-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921906318.0U Expired - Fee Related CN211692590U (en) | 2019-11-06 | 2019-11-06 | Take power balance generator's little steam turbine control governing system of back pressure type of drawing steam |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211692590U (en) |
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2019
- 2019-11-06 CN CN201921906318.0U patent/CN211692590U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201016 Termination date: 20211106 |