CN210069816U - Power plant boiler high temperature steam pipeline cinder sweeps structure - Google Patents
Power plant boiler high temperature steam pipeline cinder sweeps structure Download PDFInfo
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- CN210069816U CN210069816U CN201920890146.6U CN201920890146U CN210069816U CN 210069816 U CN210069816 U CN 210069816U CN 201920890146 U CN201920890146 U CN 201920890146U CN 210069816 U CN210069816 U CN 210069816U
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Abstract
The utility model discloses a power station boiler high-temperature steam pipeline oxide skin purging structure, the outlet of a steam-water separator is divided into two paths after passing through a heater, one path is communicated with one end of the high-pressure bypass through a high-pressure bypass adjusting valve, the other path is communicated with an inlet of a high-pressure cylinder through a high-pressure main steam valve, a steam exhaust port of the high-pressure cylinder and the other end of the high-pressure bypass are communicated with an inlet of a reheater through a pipeline and a pipe, an outlet of the reheater is divided into two paths, one path of the high-temperature steam pipeline is communicated with an inlet of a medium-pressure cylinder through a medium-pressure main throttle valve, the other path of the high-temperature steam pipeline is communicated with one end of a low-pressure bypass through a low-pressure bypass regulating valve, the other end of the low-pressure bypass is communicated with a condenser, an outlet of the medium-pressure cylinder is communicated with an inlet of a low-pressure cylinder, an outlet of the low-pressure cylinder is communicated with an inlet of the condenser, a filter screen is arranged at a liquid outlet at the bottom of the condenser, and the structure can realize.
Description
Technical Field
The utility model belongs to thermal power generation engineering capital construction debugging field relates to a power plant boiler high temperature steam pipeline cinder sweeps structure.
Background
The metal pipe and the water vapor are subjected to oxidation reaction under the conditions of high temperature and high pressure to form oxide skin, and the process is a normal and inevitable natural process. Generally, the metal temperature and the oxidation speed are in an exponential curve relationship, the steam oxidation speed is greatly increased due to small temperature increase, and frequent overtemperature or the metal temperature of the pipe wall in operation is in a higher level for a long time are the root causes of the fact that the oxide skin on the inner wall of the pipe on the heating surface of the boiler grows thickly in a short time.
The scale peeling can be caused by the large fluctuation of the steam temperature and the steam pressure in the operation. The thermal stress generated after expansion with heat and contraction with cold due to the large difference of the thermal expansion coefficient between the oxide skin on the steam side and the metal of the matrix and between the oxide skin layers is the root cause of the cracking and peeling of the oxide skin on the inner wall of the high-temperature steam pipeline.
The scale peeling can cause the foreign matter blockage of the heating surface of the boiler and cause overtemperature tube explosion. When the pipe is blocked to reach 1/2 pipe diameter, the pipeline is overheated, and the danger of pipe explosion is caused; when the blockage is larger than 1/2 pipe diameter, the pipe will be overheated and burst for a short time.
Under high load, the steam temperature of the supercritical (super) critical unit is higher (more than 600 ℃), and new oxide skin is inevitably generated in the pipeline. Because the system is perfect and a temporary emptying pipeline is not arranged, the newly generated oxide skin is difficult to discharge, and the risks of foreign body blockage and overheating tube explosion of the heating surface tube are greatly increased.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a power plant boiler high temperature steam pipe way cinder sweeps structure, this structure can realize sweeping of cinder in the high temperature steam pipe way.
In order to achieve the purpose, the utility model discloses a power plant boiler high temperature steam pipeline cinder sweeps structure includes catch water, over heater, high pressure bypass valve, high pressure main throttle, high pressure jar, high pressure bypass, re-heater, medium pressure main throttle, medium pressure jar, low pressure bypass valve, low pressure bypass and condenser;
the outlet of the steam-water separator is divided into two paths after passing through the heat device, wherein one path is communicated with one end of the high-pressure bypass through a high-pressure bypass throttle valve, the other path is communicated with the inlet of a high-pressure cylinder through a high-pressure main throttle valve, the steam exhaust port of the high-pressure cylinder and the other end of the high-pressure bypass are communicated with the inlet of a reheater through a pipeline and a pipe, the outlet of the reheater is divided into two paths, one path is communicated with the inlet of a medium-pressure cylinder through a medium-pressure main throttle valve, the other path is communicated with one end of a low-pressure bypass through a low-pressure bypass throttle valve, the other end of the low-pressure bypass is communicated with the condenser, the outlet of the medium-pressure cylinder is communicated with the inlet of a.
And a high-exhaust check valve is arranged at the steam exhaust port of the high-pressure cylinder.
The high-pressure main valve is communicated with the inlet of the high-pressure cylinder through a high-pressure regulating valve.
The middle pressure main valve is communicated with the inlet of the middle pressure cylinder through a middle pressure adjusting valve.
The liquid outlet at the bottom of the condenser is communicated with a condensed water treatment device.
And a liquid outlet at the bottom of the condenser is communicated with a condensed water treatment device through a condensed water pump.
The utility model discloses following beneficial effect has:
the utility model discloses a power plant boiler high temperature steam pipeline cinder sweeps structure when concrete work, on the basis of normal shut down procedure, through shutting down the steam turbine, utilize high pressure bypass, low pressure bypass, high pressure bypass accent door and low pressure bypass accent door control boiler's cooling rate, make the cinder be a small amount, many times, tiny particle and initiatively peel off, reuse steam sweeps most peeled off the cinder in batches and carries out the boiler; when the unit starts, through high-pressure bypass, low pressure bypass, high pressure bypass accent door and low pressure bypass accent door, will shut down a small amount of cinder that drops after the cooling completely and sweep and take out the boiler to realize sweeping of cinder in the high temperature steam pipeline, simple structure, convenient operation, the practicality is stronger, sweeps low cost, and it is better to sweep the effect.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a steam-water separator, 2 is a superheater, 3 is a high-pressure bypass valve, 4 is a high-pressure main throttle, 5 is a high-pressure throttle, 6 is a high-discharge check valve, 7 is a reheater, 8 is a medium-pressure main throttle, 9 is a medium-pressure throttle, 10 is a low-pressure bypass valve, 11 is a condenser, 12 is a filter screen, and 13 is a condensate pump.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the utility model discloses a power plant boiler high temperature steam pipeline scale sweeps structure includes catch water 1, over heater 2, high pressure bypass valve 3, high pressure main throttle 4, high pressure cylinder, high pressure bypass, re-heater 7, middling pressure main throttle 8, intermediate pressure cylinder, low pressure bypass valve 10, low pressure bypass and condenser 11; the outlet of the steam-water separator 1 is divided into two paths after passing through a heat exchanger 2, wherein one path is communicated with one end of a high-pressure bypass through a high-pressure bypass throttle 3, the other path is communicated with the inlet of a high-pressure cylinder through a high-pressure main throttle 4, the steam exhaust port of the high-pressure cylinder and the other end of the high-pressure bypass are communicated with the inlet of a reheater 7 through a pipeline and a pipe, the outlet of the reheater 7 is divided into two paths, one path is communicated with the inlet of a medium-pressure cylinder through a medium-pressure main throttle 8, the other path is communicated with one end of a low-pressure bypass through a low-pressure bypass throttle 10, the other end of the low-pressure bypass is communicated with a condenser 11, the outlet of the medium-pressure cylinder is communicated with the inlet of a low-pressure cylinder, the outlet.
A high-exhaust check valve 6 is arranged at an exhaust steam port of the high-pressure cylinder; the high-pressure main valve 4 is communicated with the inlet of the high-pressure cylinder through a high-pressure regulating valve 5; the middle pressure main valve 8 is communicated with the inlet of the middle pressure cylinder through a middle pressure adjusting valve 9; a liquid outlet at the bottom of the condenser 11 is communicated with a condensed water treatment device; the liquid outlet at the bottom of the condenser 11 is communicated with a condensed water treatment device through a condensed water pump 13.
The device has two working modes: namely purging before the unit is started and purging after the unit is stopped.
The specific process of purging after the unit is shut down comprises the following steps:
the unit gradually reduces the load to 35% BMCR, the boiler keeps 1-2 coal mills running, and puts in tiny oil or plasma ignition device for stable combustion, the side of the steam turbine slightly opens the high pressure bypass damper 3 and the low pressure bypass damper 10, when the load reduces to 30% BMCR, the opening degree of the high pressure bypass damper 3 is ensured to be more than 10%, the opening degree of the low pressure bypass damper 10 is ensured to be more than 15%, and the high pressure bypass temperature-reducing water is put into the automatic control mode;
the water-feeding pump is switched into an electric water-feeding pump from a steam-driven water-feeding pump, and an auxiliary steam source is switched into steam supply of a boiler or starting the boiler from a reheating steam cold section, so that the stability of boiler water supply is ensured;
the steam turbine is manually opened and stopped, the boiler maintains stable combustion, and at the moment, the high-pressure bypass regulating valve 3 and the low-pressure bypass regulating valve 10 are opened and finally completely developed;
fuel is added at the boiler side, the steam amount corresponding to the maximum fuel amount should not exceed 90% of the bypass capacity of the steam turbine, combustion is enhanced, the steam parameter at the outlet of the steam-water separator 1 is improved, and the steam pressure is maintained at 7.0-8.0MPa and the temperature is kept at 300-;
according to the fluctuation condition of the steam temperature and the steam pressure, the amount of coal entering the furnace is adjusted, and the stability of steam parameters in the purging process is ensured;
keeping the state, purging under a stable pressure for 45min, wherein the steam temperatures of outlets of the high-pressure bypass and the low-pressure bypass need to be closely monitored in the process, so that the steam is not over-heated, and the condenser 11 is not over-pressurized;
after the steam purging is finished, the boiler gradually reduces the coal amount, and finally, the boiler is manually stopped.
Secondly, the specific process of blowing before starting the machine is as follows:
before the steam turbine rushes to rotate, fuel is added on the boiler side, the rushing steam parameter is kept to be 8.5 MPa/temperature to be 400 ℃ stable, the high-pressure bypass throttle 3 is gradually opened to be more than 85%, and the low-pressure bypass throttle 10 reaches a full-open state;
under the working condition, performing large-flow steam purging on the superheater 2, the reheater 7 and the auxiliary pipelines thereof for 45 minutes, and in the process, paying attention to control that the steam at the outlets of the high-pressure bypass regulating valve 3 and the low-pressure bypass regulating valve 10 is not over-temperature and the condenser 11 is not over-pressure;
the oxide skin carried by the steam into the condenser 11 will be blocked at the filter screen 12 finally, so the filter screen differential pressure at the inlet of the condensate pump 13 needs to be closely monitored in the purging process, and the cleaning work of the filter screen 12 is arranged according to the blockage condition of the filter screen 12 after the purging is finished.
The purging does not need additional equipment or pipeline modification, and the cost for purging the oxide skin is low; the purging process is simple and convenient to operate, does not damage the inherent pipeline of the unit, and can be used as a normalized preventive scheme.
Claims (6)
1. A power station boiler high-temperature steam pipeline oxide skin purging structure is characterized by comprising a steam-water separator (1), a superheater (2), a high-pressure bypass throttle (3), a high-pressure main throttle (4), a high-pressure cylinder, a high-pressure bypass, a reheater (7), a medium-pressure main throttle (8), a medium-pressure cylinder, a low-pressure bypass throttle (10), a low-pressure bypass and a condenser (11);
the outlet of the steam-water separator (1) is divided into two paths after passing through a heat exchanger (2), wherein one path is communicated with one end of a high-pressure bypass through a high-pressure bypass throttle valve (3), the other path is communicated with the inlet of a high-pressure cylinder through a high-pressure main throttle valve (4), the steam exhaust port of the high-pressure cylinder and the other end of the high-pressure bypass are communicated with the inlet of a reheater (7) through a pipeline and a pipe, the outlet of the reheater (7) is divided into two paths, one path is communicated with the inlet of an intermediate-pressure cylinder through an intermediate-pressure main throttle valve (8), the other path is communicated with one end of a low-pressure bypass through a low-pressure bypass throttle valve (10), the other end of the low-pressure bypass is communicated with a condenser (11), the outlet of the intermediate-pressure cylinder is communicated with the inlet of a low-pressure cylinder, the outlet of the low-pressure cylinder is.
2. The utility boiler high-temperature steam pipeline oxide skin purging structure as defined in claim 1, wherein a high-exhaust check valve (6) is arranged at an exhaust port of the high-pressure cylinder.
3. The power station boiler high-temperature steam pipeline oxide skin purging structure as claimed in claim 1, wherein the high-pressure main throttle valve (4) is communicated with an inlet of the high-pressure cylinder through a high-pressure regulating valve (5).
4. The utility boiler high-temperature steam pipeline scale purging structure as defined in claim 1, wherein the intermediate pressure main valve (8) is communicated with the inlet of the intermediate pressure cylinder through an intermediate pressure regulating valve (9).
5. The power station boiler high-temperature steam pipeline oxide skin purging structure as defined in claim 1, wherein a liquid outlet at the bottom of the condenser (11) is communicated with a condensed water treatment device.
6. The power station boiler high-temperature steam pipeline oxide skin purging structure as defined in claim 5, wherein a liquid outlet at the bottom of the condenser (11) is communicated with the condensed water treatment device through a condensed water pump (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920890146.6U CN210069816U (en) | 2019-06-13 | 2019-06-13 | Power plant boiler high temperature steam pipeline cinder sweeps structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920890146.6U CN210069816U (en) | 2019-06-13 | 2019-06-13 | Power plant boiler high temperature steam pipeline cinder sweeps structure |
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| CN210069816U true CN210069816U (en) | 2020-02-14 |
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| CN201920890146.6U Active CN210069816U (en) | 2019-06-13 | 2019-06-13 | Power plant boiler high temperature steam pipeline cinder sweeps structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110160033A (en) * | 2019-06-13 | 2019-08-23 | 西安热工研究院有限公司 | A kind of station boiler high temperature steam pipeline oxide skin purging structure |
| CN114453353A (en) * | 2022-02-17 | 2022-05-10 | 北京海泰科环科技有限公司 | Swirl generator, cleaning device and cleaning system |
-
2019
- 2019-06-13 CN CN201920890146.6U patent/CN210069816U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110160033A (en) * | 2019-06-13 | 2019-08-23 | 西安热工研究院有限公司 | A kind of station boiler high temperature steam pipeline oxide skin purging structure |
| CN114453353A (en) * | 2022-02-17 | 2022-05-10 | 北京海泰科环科技有限公司 | Swirl generator, cleaning device and cleaning system |
| CN114453353B (en) * | 2022-02-17 | 2022-08-02 | 北京海泰科环科技有限公司 | Swirl generator, cleaning device and cleaning system |
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