CN213574252U - High-pressure side shaft seal adjusting system of high-intermediate pressure cylinder of high-back-pressure unit - Google Patents
High-pressure side shaft seal adjusting system of high-intermediate pressure cylinder of high-back-pressure unit Download PDFInfo
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- CN213574252U CN213574252U CN202022738945.7U CN202022738945U CN213574252U CN 213574252 U CN213574252 U CN 213574252U CN 202022738945 U CN202022738945 U CN 202022738945U CN 213574252 U CN213574252 U CN 213574252U
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- 230000001105 regulatory effect Effects 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a high and medium pressure cylinder high pressure side shaft seal adjusting system of a high back pressure unit, the high back pressure unit comprises a high and medium pressure cylinder, a low pressure heater and a shaft seal steam supply system; the high-medium pressure cylinder is connected with the low-pressure cylinder through a communicating pipe, the low-pressure cylinder is connected with the low-pressure heater through a steam extraction pipeline, a first shaft seal gear and a second shaft seal gear are arranged on the high-pressure cylinder side of the high-medium pressure cylinder, and the shaft seal adjusting system comprises a condenser, a first valve group, a second valve group and a deaerator; the shaft seal second gear is communicated with the condenser through a first valve group; the shaft seal second gear is also communicated with the steam extraction pipeline through a second valve group; the first shaft seal gear is communicated with the deaerator. The utility model discloses can avoid the low pressure jar to take out vapour pressure to rise and keep off the regulation and bring the influence for the bearing seal of high intermediate pressure jar, can also avoid high-pressure side shaft seal pressure to surpass normal range, guarantee unit safety normal operating.
Description
Technical Field
The utility model relates to a bearing seal adjusting device of high back pressure unit steam turbine.
Background
At present, the heat supply unit is generally subjected to heat supply transformation of a high-backpressure double rotor, so that the heat supply capacity of the unit is increased, and energy conservation and consumption reduction are realized. The pure condensing long blade operates in the non-heating period, and the low-pressure cylinder rotor of the short last-stage blade is replaced in the heating period to supply heat with high back pressure.
For the high back pressure steam turbine set, as the exhaust pressure of the low pressure cylinder rises, the exhaust pressure connected with the low pressure cylinder also rises correspondingly, so that the original shaft seal second gear adjusting system is blocked, the difficulties are brought to the adjustment of the shaft seal system, the control of the differential expansion of the set and the operation of a #2 low pressure heater, the output of the high back pressure steam turbine set is limited to a certain extent, and certain potential safety hazards exist in the operation of the set.
SUMMERY OF THE UTILITY MODEL
The utility model provides a high intermediate pressure jar high pressure side shaft seal governing system of high back pressure unit, its purpose: the problem that the stable operation of the unit is difficult due to the fact that the shaft seal secondary adjustment of the high and medium pressure cylinder is affected by the increase of the steam extraction pressure of the low pressure cylinder is avoided.
The utility model discloses technical scheme as follows:
a high-pressure side shaft seal adjusting system of a high-intermediate pressure cylinder of a high back pressure unit comprises the high-intermediate pressure cylinder, a low pressure heater and a shaft seal steam supply system; the high-medium pressure cylinder is connected with the low-pressure cylinder through a communicating pipe, the low-pressure cylinder is connected with the low-pressure heater through a steam extraction pipeline, a first shaft seal gear and a second shaft seal gear are arranged on the high-pressure cylinder side of the high-medium pressure cylinder, and the shaft seal adjusting system comprises a condenser, a first valve group, a second valve group and a deaerator;
the shaft seal second gear is communicated with the condenser through a first valve group;
the shaft seal second gear is also communicated with the steam extraction pipeline through a second valve group;
the first shaft seal gear is communicated with the deaerator.
As a further improvement of the system: the high-pressure cylinder and the medium-pressure cylinder are communicated with the shaft seal first gear and the shaft seal second gear of the high-pressure cylinder and the shaft seal of the low-pressure cylinder.
As a further improvement of the system: the first valve group and the second valve group comprise electric regulating valves which can be remotely controlled;
the electric regulating valve comprises a valve body, a valve core, a motor, a driving circuit, a single chip microcomputer, an encoder and a wireless communication module; the valve core is arranged on the valve body in a rotating connection mode and is used for controlling the on-off and the opening of the pipeline; the motor is used for driving the valve core to rotate, and the output end of the single chip microcomputer is connected with the motor through a driving circuit; the encoder is connected with the single chip microcomputer and used for detecting the rotation angle of the valve core; the single chip microcomputer is also connected with the wireless communication module.
Compared with the prior art, the utility model discloses following beneficial effect has: (1) according to the system, the second valve group is added between the steam extraction pipeline and the second gear of the high-pressure side shaft seal, the influence of the steam extraction pressure of the low-pressure cylinder on the adjustment of the second gear of the shaft seal of the high-intermediate-pressure cylinder can be avoided by adjusting the second valve group, the problem that the steam extraction pipeline cannot effectively enter the low-pressure heater for heat exchange can be solved, the water temperature difference of an inlet and an outlet of the pressure heater tends to be normal, and the heat regeneration efficiency of the steam turbine set is improved; (2) according to the system, the first valve group is additionally arranged between the second gear of the high-pressure side shaft seal and the condenser, when heating operation and unit load are increased, the second gear of the high-pressure side shaft seal can be leaked and pumped to the condenser, the situation that the high-pressure side shaft seal pressure exceeds a normal range and leaks to the environment is avoided, meanwhile, differential expansion of a high-medium pressure cylinder is increased due to higher shaft seal pressure, and the unit is ensured to safely operate during high-back-pressure heating; (3) the shaft seal is communicated with the deaerator at the first gear, so that the corrosion to other equipment such as pipelines and the like can be reduced; (4) the first valve group and the second valve group preferably use electric adjusting valves which can be remotely controlled, and the operation is convenient in the field.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The technical scheme of the utility model is explained in detail below with the attached drawings:
referring to fig. 1, a high-pressure side shaft seal adjusting system for a high-intermediate pressure cylinder of a high back pressure unit, the high back pressure unit includes the high-intermediate pressure cylinder 1, a low pressure cylinder 2, a low pressure heater 5 and a shaft seal steam supply system 10; the high-medium pressure cylinder 1 is connected with the low-pressure cylinder 2 through a communicating pipe, the low-pressure cylinder 2 is connected with the low-pressure heater 5 through a steam extraction pipeline 4, and a first shaft seal gear 6 and a second shaft seal gear 8 are arranged on the high-pressure cylinder side of the high-medium pressure cylinder 1.
The shaft seal adjusting system comprises a condenser 3, a first valve group 9, a second valve group 12 and a deaerator 7. The second shaft seal gear 8 is communicated with the condenser 3 through a first valve group 9, and the second shaft seal gear 8 is also communicated with the steam extraction pipeline 4 through a second valve group 12. The first shaft seal gear 6 is communicated with the deaerator 7.
The shaft seal adjusting system further comprises a cooler 11, and the shaft seal first gear 6 and the shaft seal second gear 8 of the high and medium pressure cylinder 1 and the shaft seal of the low pressure cylinder 2 are also communicated with the cooler 11. The shaft seal return steam finally reaches the cooler 11 for cooling.
Further, the first valve group 9 and the second valve group 12 each comprise electrically adjustable valves which can be remotely controlled. The electric adjusting valve comprises a valve body, a valve core, a motor, a driving circuit, a single chip microcomputer, an encoder and a wireless communication module. The valve core is arranged on the valve body in a rotating connection mode and used for controlling the on-off and the opening of the pipeline. The motor is a stepping motor, and the output shaft is connected with the valve core through a coupler and used for driving the valve core to rotate. The single chip microcomputer adopts an STM32 series control chip as a control center, and the output end of the single chip microcomputer is connected with the motor through a driving circuit. In order to avoid control errors caused by lost steps of the stepping motor, the encoder is arranged between the valve core and the valve seat and connected with the single chip microcomputer for detecting the rotation angle of the valve core to form closed-loop control. The single chip microcomputer is also connected with the wireless communication module (Wifi module) through a ModBus serial bus, and the single chip microcomputer can also be in wired connection with a PLC or other control systems through the serial bus.
In the non-heating period, the first valve group 9 is fully closed. The second valve group 12 can be adjusted according to the change of the load of the machine set, so that the steam supply pressure of the shaft seal system is in a normal range.
In the heating period and during the high back pressure operation of the unit, the first valve group 9 is opened to enable the steam leakage of the second gear 8 of the shaft seal to reach the condenser 3, and the opening degree is adjusted to ensure that the steam supply pressure of the shaft seal system and the vacuum of the condenser 3 of the unit are in a normal range. During this time, the second valve group 12 is fully closed.
Claims (3)
1. A high-pressure side shaft seal adjusting system of a high-intermediate pressure cylinder of a high back pressure unit comprises the high-intermediate pressure cylinder (1), a low pressure cylinder (2), a low pressure heater (5) and a shaft seal steam supply system (10); high intermediate pressure jar (1) is through connecting low pressure jar (2) communicating pipe, low pressure jar (2) are connected low pressure heater (5) through steam extraction pipeline (4), the high-pressure jar side of high intermediate pressure jar (1) is equipped with first gear of bearing seal (6) and second gear of bearing seal (8), its characterized in that: the shaft seal adjusting system comprises a condenser (3), a first valve group (9), a second valve group (12) and a deaerator (7);
the shaft seal second gear (8) is communicated with the condenser (3) through a first valve group (9);
the shaft seal second gear (8) is also communicated with the steam extraction pipeline (4) through a second valve group (12);
the first shaft seal gear (6) is communicated with the deaerator (7).
2. The high-pressure side shaft seal adjusting system for the high-intermediate pressure cylinder of the high back pressure unit as claimed in claim 1, wherein: the high-medium pressure cylinder (1) and the low-medium pressure cylinder (2) are communicated with the cooler (11).
3. The high and intermediate pressure cylinder high pressure side shaft seal adjusting system of the high back pressure machine set according to claim 1 or 2, wherein: the first valve group (9) and the second valve group (12) comprise electric regulating valves which can be remotely controlled;
the electric regulating valve comprises a valve body, a valve core, a motor, a driving circuit, a single chip microcomputer, an encoder and a wireless communication module; the valve core is arranged on the valve body in a rotating connection mode and is used for controlling the on-off and the opening of the pipeline; the motor is used for driving the valve core to rotate, and the output end of the single chip microcomputer is connected with the motor through a driving circuit; the encoder is connected with the single chip microcomputer and used for detecting the rotation angle of the valve core; the single chip microcomputer is also connected with the wireless communication module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022738945.7U CN213574252U (en) | 2020-11-24 | 2020-11-24 | High-pressure side shaft seal adjusting system of high-intermediate pressure cylinder of high-back-pressure unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022738945.7U CN213574252U (en) | 2020-11-24 | 2020-11-24 | High-pressure side shaft seal adjusting system of high-intermediate pressure cylinder of high-back-pressure unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213574252U true CN213574252U (en) | 2021-06-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022738945.7U Withdrawn - After Issue CN213574252U (en) | 2020-11-24 | 2020-11-24 | High-pressure side shaft seal adjusting system of high-intermediate pressure cylinder of high-back-pressure unit |
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| Country | Link |
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| CN (1) | CN213574252U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114508395A (en) * | 2021-09-23 | 2022-05-17 | 华能山东发电有限公司烟台发电厂 | Water injection tank overflow water and cable pit water storage recovery system |
-
2020
- 2020-11-24 CN CN202022738945.7U patent/CN213574252U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114508395A (en) * | 2021-09-23 | 2022-05-17 | 华能山东发电有限公司烟台发电厂 | Water injection tank overflow water and cable pit water storage recovery system |
| CN114508395B (en) * | 2021-09-23 | 2024-01-26 | 华能山东发电有限公司烟台发电厂 | Water tank overflow water and cable pit water storage recovery system |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20210629 Effective date of abandoning: 20231210 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20210629 Effective date of abandoning: 20231210 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |