CN213478407U - Main unit shaft seal temperature-reducing water pipeline system - Google Patents
Main unit shaft seal temperature-reducing water pipeline system Download PDFInfo
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- CN213478407U CN213478407U CN202022506386.7U CN202022506386U CN213478407U CN 213478407 U CN213478407 U CN 213478407U CN 202022506386 U CN202022506386 U CN 202022506386U CN 213478407 U CN213478407 U CN 213478407U
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Abstract
The utility model relates to a main machine shaft seal desuperheating water pipeline system, which comprises a fine desalination device for treating condensed water from a condensate pump, wherein the fine desalination device is connected with a deaerator through a shaft seal heater and a low pressure heater in sequence along a branch, the deaerator is correspondingly connected with a feed pump A and a feed pump B through a preposed pump A and a preposed pump B respectively, the deaerator is also directly connected with a feed pump C independently, the feed pump A, the feed pump B and the feed pump C are all connected with a high pressure heater, the fine desalination device is also connected with a main machine shaft seal after passing through the condensed water to a main machine shaft seal desuperheating water isolation door, a main machine desuperheating water adjusting door and a main machine shaft seal desuperheating device from an auxiliary steam system in sequence along another branch, the prepositive pump A is also connected with the main machine temperature-reducing water adjusting door after sequentially passing through the outlet of the prepositive pump A to the main machine shaft seal temperature-reducing water first isolation door and the outlet of the prepositive pump A to the main machine shaft seal temperature-reducing water second isolation door along the other branch. Compared with the prior art, the utility model has the advantages of controllable safe operation of temperature.
Description
Technical Field
The utility model belongs to the technical field of power plant's bearing seal desuperheating water technique and specifically relates to a host computer bearing seal desuperheating water pipe-line system is related to.
Background
The steam turbine of a part of domestic power plants at present is a 660MW ultra-supercritical, single-intermediate reheating, single-shaft, four-cylinder four-steam-discharge, double-backpressure and condensing steam turbine set; the shaft seal system is provided with two shaft blowers with 2 multiplied by 100 percent of capacity and a shaft seal heater. When the main machine is started, the shaft seal steam source is connected out from the auxiliary steam main pipe, one path of the small shaft seal steam source is directly connected out from the auxiliary steam main pipe, the other path of the small shaft seal steam source is connected out from the main machine shaft seal auxiliary steam inlet valve, and the exhausted steam respectively returns to the shaft seal heater. Under normal conditions, the steam source of the shaft seal of the small machine uses the main machine shaft seal to assist steam after the steam inlet door, so that the steam inlet temperature of the main machine shaft seal auxiliary steam can be increased. The temperature of the steam is gradually changed to high-pressure shaft seal leakage and valve rod leakage along with the rise of load, and a temperature reducing device is arranged before auxiliary steam supply shaft seal steam inlet.
In order to meet the requirement of steam supply temperature of the shaft seal under low load, a water spray desuperheater is arranged from the auxiliary steam to the main shaft seal, and the water spray quantity of the water spray desuperheater is controlled through temperature, so that the desuperheating is realized (the steam inlet temperature of the main shaft seal is not more than 340 ℃, otherwise, the steam inlet throttle is automatically closed). The main shaft seal desuperheater water source is condensed water which is connected out from a front condensed water pipeline of the shaft seal heater. However, due to the fact that temperature difference is too large (the temperature of condensed water is between 26 ℃ and 42 ℃ in each season, the steam inlet temperature of shaft seal steam of a low-load main machine is above 330 ℃), the steam inlet temperature of shaft seal steam can be greatly reduced only by opening a main machine shaft seal temperature reducing water regulating valve with a very small opening degree, and in order to prevent serious accidents of rotor locking caused by the steam inlet temperature of shaft seal steam of the main machine not being lower than the low limit of 250 ℃, the temperature reducing water is not put into use actually; in the low-load condition, the temperature of the main steam is generally reduced, so that the temperature of the reheated steam (auxiliary steam source) of the cold section is reduced to reduce the steam inlet temperature of the main shaft seal, and the steam inlet throttle is prevented from being automatically closed due to overhigh temperature. Therefore, contradictions occur, namely the main shaft seal temperature-reducing water system cannot be put into use, the running economy of the unit is poor, and the high running efficiency cannot be achieved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a main unit shaft seal desuperheating water pipe-line system in order to overcome the defects of the prior art.
The purpose of the utility model can be realized through the following technical scheme:
a main machine shaft seal temperature-reducing water pipeline system comprises a pipeline system for processing fine desalting from a condensate pump, wherein the fine desalting is connected with a deaerator through a shaft seal heater and a low-pressure heater in sequence along a branch line, the deaerator is also correspondingly connected with the feed pump A and the feed pump B through the preposed pump A and the preposed pump B respectively, the deaerator is also independently and directly connected with a feed pump C, the feed pump A, the feed pump B and the feed pump C are also connected with a high-pressure heater, the fine desalination device sequentially passes through the condensed water along the other branch and then is connected with the main shaft seal after passing through the main shaft seal desuperheating water isolation door, the main shaft desuperheating water adjusting door and the main shaft seal desuperheater from the auxiliary steam system, the preposed pump A is connected with the main machine temperature-reducing water adjusting door after sequentially passing through the outlet of the preposed pump A to the main machine shaft seal temperature-reducing water first isolation door and the outlet of the preposed pump A to the main machine shaft seal temperature-reducing water second isolation door along the other branch.
Furthermore, the stop valve is adopted for the isolation door from the condensed water to the main machine shaft seal desuperheating water.
Furthermore, a stop valve is adopted from the outlet of the front pump A to the first isolation door of the main machine shaft seal desuperheating water.
Furthermore, a stop valve is adopted from the outlet of the front pump A to the second isolation door of the main machine shaft seal desuperheating water.
Furthermore, the host machine temperature-reducing water adjusting door adopts a pneumatic adjusting valve, an electric adjusting valve, a hydraulic adjusting valve or a self-operated adjusting valve.
Furthermore, the main shaft seal desuperheater adopts a Venturi type water spray desuperheater with a water containing chamber, a vortex Venturi type water spray desuperheater or a porous spray pipe type water spray desuperheater.
Compared with the prior art, the utility model has the advantages of it is following:
(1) the system comprises condensate water from a condensate pump, which is subjected to fine desalination treatment and then sequentially passes through a shaft seal heater and a low-pressure heater to be connected with a deaerator along one branch, the deaerator is respectively and correspondingly connected with a feed pump A and a feed pump B through a preposed pump A and a preposed pump B, the deaerator is also independently and directly connected with a feed pump C, the feed pump A, the feed pump B and the feed pump C are also respectively and further connected with a high-pressure heater, the condensate water subjected to fine desalination treatment sequentially passes through the condensate water along the other branch and then is connected with a main machine shaft seal desuperheating water isolation door, a main machine desuperheating water adjusting door and a main machine desuperheating water reducer from an auxiliary steam system and then is connected with a main machine shaft seal, the preposed pump A sequentially passes through a preposed pump A outlet to a main machine desuperheating water first isolation door and a preposed pump A outlet to a main machine shaft seal desuperheating water second isolation door and then is connected with the main machine desuperheating water adjusting door, the problem that the steam inlet temperature of the main shaft seal is high in the same type of condensing steam turbine unit is solved.
(2) Adopted the utility model discloses behind the system, host computer bearing seal desuperheater usability when having improved the low-load has avoided falling the operation of main vapour temperature, improves unit economic nature. Calculated according to the load rate of less than 45% per year of 340h, the standard coal can be saved by 0.6 g/kW.h when the main steam temperature is raised by 10 ℃, 60 tons of standard coal can be saved all year round, and the cost is reduced by about 3.6 ten thousand yuan.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
in the figure, 1 is a condensate water to main machine shaft seal desuperheating water isolation door, 2 is a main machine desuperheating water adjusting door, 3 is a main machine shaft seal desuperheater, 4 is a first isolation door from an outlet of a front pump A to a main machine shaft seal desuperheating water, and 5 is a second isolation door from an outlet of the front pump A to the main machine shaft seal desuperheating water.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
(1) Device structure and connection relation:
FIG. 1 shows a schematic diagram of the overall structure of a host shaft seal desuperheating water pipeline system of the present invention, which comprises a main unit for processing the fine desalination from a condensate pump, the fine desalination is connected with a deaerator through a shaft seal heater and a low pressure heater in sequence along one branch, the deaerator is correspondingly connected with a feed pump A and a feed pump B through a pre-pump A and a pre-pump B, the deaerator is directly connected with a feed pump C, the feed pump A, the feed pump B and the feed pump C are all connected with a high pressure heater, the fine desalination is connected with a host shaft seal desuperheating water isolation door 1, a host desuperheating water adjusting door 2 and a host shaft seal desuperheating device 3 from an auxiliary steam system in sequence along another branch, the prepositive pump A is also connected with the main machine temperature-reducing water adjusting door 2 after sequentially passing through the outlet of the prepositive pump A to the main machine shaft seal temperature-reducing water first isolation door 4 and the outlet of the prepositive pump A to the main machine shaft seal temperature-reducing water second isolation door 5 along the other branch.
In this embodiment, the isolating door 1 for reducing the temperature from the condensed water to the main shaft seal adopts a stop valve. The stop valve is adopted from the outlet of the front pump A to the first isolation door 4 of the main machine shaft seal desuperheating water. The stop valve is adopted from the outlet of the front pump A to the second isolation door 5 of the main machine shaft seal desuperheating water. The main machine temperature-reducing water adjusting door 2 adopts a pneumatic adjusting valve, an electric adjusting valve, a hydraulic adjusting valve or a self-operated adjusting valve. The main shaft seal desuperheater 3 adopts a Venturi type water spray desuperheater with a water containing chamber, a vortex Venturi type water spray desuperheater or a porous spray pipe type water spray desuperheater.
(2) The improvement is as follows:
a water supply source is added to the main shaft seal desuperheating water, the water is connected out from a main pipe at the outlet of a preposed pump A, and 2 manual isolation doors are additionally arranged; the water temperature of the desuperheating water is greatly increased, so that the temperature difference of steam and water is reduced, and the usability of the main shaft seal desuperheater is greatly increased;
(3) the working principle is as follows:
in the low-load operation of the unit, the temperature difference between the water temperature of the main shaft seal temperature-reducing water and the steam supply temperature of the shaft seal is too large, so that the temperature of the steam of the main shaft seal is remarkably reduced under the working condition that the main shaft seal temperature-reducing water adjusting door is slightly opened, and the main shaft seal temperature-reducing water system cannot be normally put into use. Adopt the technical scheme of the utility model, change the desuperheating water source for the feedwater, connect out from leading pump A outlet female pipe, reduced desuperheating water temperature by a wide margin and bearing seal supply vapour temperature difference, host computer bearing seal desuperheater usability greatly increased, host computer bearing seal temperature is controllable when guaranteeing the low-load, has avoided reducing the operation of main steam temperature for guaranteeing shaft seal vapour safety.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The main machine shaft seal desuperheating water pipeline system is characterized by comprising refined desalted water used for treating condensed water from a condensate pump, wherein the refined desalted water sequentially passes through a shaft seal heater and a low-pressure heater along a branch path and is connected with a deaerator, the deaerator is correspondingly connected with a feed pump A and a feed pump B through a preposed pump A and a preposed pump B respectively, the deaerator is further independently and directly connected with a feed pump C, the feed pump A, the feed pump B and the feed pump C are also connected with a high-pressure heater, the refined desalted water sequentially passes through the condensed water along another branch path and is connected with a main machine shaft seal desuperheating water isolation door (1), a main machine desuperheating water adjusting door (2) and a main machine desuperheating water reducer (3) from an auxiliary steam system, the preposed pump A sequentially passes through a preposed pump A outlet to a main machine shaft seal desuperheating water first isolation door (4) and a preposed pump A outlet to a main machine desuperheating water second isolation door (5) along another branch path and then is connected with the main machine shaft seal desu The water adjusting door (2) is connected.
2. The main machine shaft seal desuperheating water pipeline system according to claim 1, wherein the condensate water to the main machine shaft seal desuperheating water isolation door (1) adopts a stop valve.
3. The main machine shaft seal desuperheating water pipeline system of claim 1, wherein the pre-pump A outlet to the main machine shaft seal desuperheating water first isolation door (4) adopts a stop valve.
4. The main machine shaft seal desuperheating water pipeline system of claim 1, wherein the pre-pump A outlet to the main machine shaft seal desuperheating water second isolation door (5) adopts a stop valve.
5. The main machine shaft seal temperature-reducing water pipeline system according to claim 1, wherein the main machine temperature-reducing water adjusting door (2) adopts a pneumatic adjusting valve or an electric adjusting valve.
6. The main machine shaft seal desuperheater pipeline system of claim 1, wherein the main machine shaft seal desuperheater (3) is a venturi spray desuperheater with a water chamber.
7. The main machine shaft seal desuperheater water pipeline system of claim 1, wherein the main machine shaft seal desuperheater (3) is a vortex venturi type water spray desuperheater.
8. The main machine shaft seal desuperheater water pipeline system according to claim 1, wherein the main machine shaft seal desuperheater (3) is a multi-hole spray pipe type water spray desuperheater.
9. The main machine shaft seal temperature-reducing water pipeline system according to claim 1, wherein the main machine temperature-reducing water adjusting door (2) adopts a hydraulic adjusting valve.
10. The main machine shaft seal temperature-reducing water pipeline system according to claim 1, wherein the main machine temperature-reducing water adjusting door (2) adopts a self-operated adjusting valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022506386.7U CN213478407U (en) | 2020-11-03 | 2020-11-03 | Main unit shaft seal temperature-reducing water pipeline system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022506386.7U CN213478407U (en) | 2020-11-03 | 2020-11-03 | Main unit shaft seal temperature-reducing water pipeline system |
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| Publication Number | Publication Date |
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| CN213478407U true CN213478407U (en) | 2021-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022506386.7U Active CN213478407U (en) | 2020-11-03 | 2020-11-03 | Main unit shaft seal temperature-reducing water pipeline system |
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| CN (1) | CN213478407U (en) |
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2020
- 2020-11-03 CN CN202022506386.7U patent/CN213478407U/en active Active
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