CN114278398A - Dustproof and anticorrosive online maintenance system and method for steam turbine - Google Patents
Dustproof and anticorrosive online maintenance system and method for steam turbine Download PDFInfo
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Abstract
The application discloses a dustproof and anticorrosive online maintenance and protection system for a steam turbine, which comprises the steam turbine (7) and a steam turbine power steam pipeline (6), wherein the steam turbine power steam pipeline (6) is communicated with the inside of the steam turbine (7) and is used for introducing power steam into the steam turbine (7), the power steam drives a moving part in the steam turbine (7) to operate, and a power steam valve (2) is arranged on the steam turbine power steam pipeline (6); the online maintenance system for the dustproof and anticorrosive of the steam turbine further comprises a steam pipeline (8) for maintenance, the steam pipeline (8) for maintenance is communicated with the inside of the steam turbine (7), and a maintenance steam valve (1) is arranged on the steam pipeline (8) for maintenance. In the technical scheme of the invention, maintenance steam is used for maintaining and purging the interior of the steam turbine according to a specified time period and mode in the operation process of the steam turbine, and a dispersion corrosion inhibitor is added to power steam entering the steam turbine, so that the long-term safe operation of the steam turbine device is ensured.
Description
Technical Field
The invention relates to a dustproof and anticorrosive online maintenance system and a maintenance method for a steam turbine, and belongs to the field of coal chemical equipment.
Background
In the process flow of the high-pressure coal gasification device adopted by the current large-scale coal chemical industry enterprises, the gasification device can generate a large amount of high-temperature grey water in the production process, the temperature of the grey water is generally 200-245 ℃, the water amount of a single set of device is 170-450T/H, and the grey water contains a large amount of dust and corrosive media.
According to the control of environmental pollution in China at present, a large amount of high-temperature grey water of coal chemical enterprises is not allowed to be emptied, so that only dispersing agents can be added for treatment (the dispersing agents can be used only at low temperature). In order to reduce the temperature, the high-pressure coal gasification device generally adopts a multi-stage flash evaporation method to reduce the temperature of the high-temperature grey water step by step until the temperature is reduced to the temperature which can be used by the dispersing agent; part of steam generated in the high-temperature grey water stage-by-stage flash evaporation process can be recycled, and the rest of steam is discharged due to incapability of recycling, so that a large amount of energy is lost, and environmental pollution is caused. To solve this problem, a turbine unit with a dust-proof and corrosion-proof function can be used to recover this energy and eliminate pollution. However, the flash steam contains a large amount of dust and corrosive media, so that the steam turbine device cannot ensure long-term safe and normal operation.
Disclosure of Invention
The invention provides a dustproof and anticorrosive online maintenance system and a maintenance method for a steam turbine.
The invention adopts the technical scheme that the online maintenance system for the dust prevention and corrosion prevention of the steam turbine comprises the steam turbine and a steam turbine power steam pipeline, wherein the steam turbine power steam pipeline is communicated with the inside of the steam turbine and introduces power steam into the steam turbine, the power steam drives a moving part in the steam turbine to operate, and a power steam valve is arranged on the steam turbine power steam pipeline.
The online maintenance system for the dustproof and corrosion-resistant steam turbine also comprises a maintenance steam pipeline, the maintenance steam pipeline is communicated with the interior of the steam turbine, and a maintenance steam valve is arranged on the maintenance steam pipeline;
when the steam turbine is in a shutdown process but the moving parts in the steam turbine still keep a moving state, introducing maintenance steam into the steam turbine by a maintenance steam pipeline and blowing the inner wall of the steam turbine and the surfaces of the moving parts of the steam turbine by the maintenance steam;
or when the steam turbine is started again after being stopped, introducing maintenance steam into the steam turbine through a maintenance steam pipeline to blow and sweep the inner wall of the steam turbine and the surface of a moving part of the steam turbine;
the pressure of the maintenance steam in the maintenance steam pipeline is greater than that of the power steam in the power steam pipeline of the turbine
In the optimized dustproof and anticorrosive online maintenance system for the steam turbine, steam introduced into the steam turbine by the steam turbine power steam pipeline is high-temperature grey water flash steam generated by the coal gasification device; the maintenance steam pipeline introduces clean saturated steam or superheated steam into the steam turbine; the moving parts in the steam turbine comprise a steam turbine main shaft, an impeller, steam turbine moving blades and the like, and all the moving blades of the steam turbine are non-top blades.
Optimally, the dustproof and anticorrosive online maintenance system for the steam turbine further comprises a dispersing corrosion inhibitor pipeline;
the dispersed corrosion inhibitor pipeline is communicated with the interior of the steam turbine through a steam turbine power steam pipeline; the dispersed corrosion inhibitor pipeline leads the dispersed corrosion inhibitor into a power steam pipeline of the steam turbine, and the dispersed corrosion inhibitor is mixed with the power steam and then led into the steam turbine;
or the dispersed corrosion inhibitor pipeline is directly communicated with the interior of the steam turbine and the dispersed corrosion inhibitor is introduced into the steam turbine;
the dispersing corrosion inhibitor is a mixture of a dispersing agent and a corrosion inhibitor; the pressure of the dispersing corrosion inhibitor is greater than the pressure of steam of the power of the turbine; the dispersing corrosion inhibitor can be continuously introduced in the normal working process of the steam turbine, or the dispersing corrosion inhibitor can be introduced at certain time intervals in the normal working process of the steam turbine.
Preferably, after a power steam valve on a power steam pipeline of the steam turbine is closed, when the steam turbine is in a shutdown process but a moving part in the steam turbine still keeps a moving state, the maintenance steam pipeline of the online maintenance system for the dust prevention and corrosion prevention of the steam turbine introduces maintenance steam into the steam turbine; the time for introducing maintenance steam into the steam turbine is more than or equal to two hours; the time for introducing maintenance steam into the steam turbine is allowed to continue until the next startup of the steam turbine;
or when the steam turbine is restarted after being stopped, the power steam valve is in a closed state, the maintenance steam valve is opened firstly, maintenance steam is introduced into the steam turbine through the maintenance steam pipeline, and the time for introducing the maintenance steam into the steam turbine is more than or equal to two hours.
Preferably, in the online maintenance system for the dust prevention and corrosion prevention of the steam turbine, when the steam turbine operates normally and the power steam valve is opened, the maintenance steam valve can be partially opened, and the steam pressure in the maintenance steam pipeline is greater than the steam pressure of the power steam pipeline of the steam turbine.
A dustproof and anticorrosive online maintenance method for a steam turbine, the dustproof and anticorrosive online maintenance system for the steam turbine, comprises the following steps:
when the steam turbine works normally, introducing power steam into the steam turbine through a steam turbine power steam pipeline;
opening a maintenance steam valve of a maintenance steam pipeline when the steam turbine is in a shutdown process but the moving parts in the steam turbine still keep a moving state, introducing maintenance steam into the steam turbine through the maintenance steam pipeline, and purging the inner wall of the steam turbine and the surfaces of the moving parts of the steam turbine through the maintenance steam;
or when the steam turbine is started, opening a maintenance steam valve of a maintenance steam pipeline, introducing maintenance steam into the steam turbine through the maintenance steam pipeline, and blowing the inner wall of the steam turbine and the surface of a moving part of the steam turbine;
the moving parts in the steam turbine comprise a steam turbine main shaft, an impeller, a steam turbine moving blade and the like.
Optimally, in the online maintenance method for the dust prevention and corrosion prevention of the steam turbine, steam introduced into the steam turbine by the steam turbine power steam pipeline is high-temperature grey water flash steam generated by the coal gasification device; the maintenance steam pipeline introduces clean saturated steam or superheated steam into the steam turbine; the moving parts in the steam turbine comprise a steam turbine main shaft, an impeller, steam turbine moving blades and the like, and all the moving blades of the steam turbine are non-top blades.
Optimally, in the online maintenance method for the dust prevention and corrosion prevention of the steam turbine, in the process of driving moving parts in the steam turbine to operate by power steam, the dispersed corrosion inhibitor pipeline leads the dispersed corrosion inhibitor into the steam turbine through the power steam pipeline of the steam turbine or directly leads the dispersed corrosion inhibitor into the steam turbine;
the dispersing corrosion inhibitor is a mixture of a dispersing agent and a corrosion inhibitor; the pressure of the dispersing corrosion inhibitor is greater than the pressure of steam of the power of the turbine; the dispersing corrosion inhibitor can be continuously introduced in the normal working process of the steam turbine, or the dispersing corrosion inhibitor can be introduced at certain time intervals in the normal working process of the steam turbine.
Preferably, after a power steam valve on a power steam pipeline of the steam turbine is closed, when the steam turbine is in a shutdown process but moving parts in the steam turbine still keep a moving state, the maintenance steam pipeline is used for introducing maintenance steam into the steam turbine; the time for introducing maintenance steam into the steam turbine is more than or equal to two hours; the time for introducing maintenance steam into the steam turbine is allowed to continue until the next startup of the steam turbine;
or when the steam turbine is restarted after being stopped, the power steam valve is in a closed state, the maintenance steam valve is opened firstly, maintenance steam is introduced into the steam turbine through the maintenance steam pipeline, and the time for introducing the maintenance steam into the steam turbine is more than or equal to two hours.
Preferably, in the online maintenance method for the dustproof and anticorrosion of the steam turbine, when the steam turbine operates normally and the power steam valve is opened, the maintenance steam valve can be kept partially opened, and the steam pressure in the maintenance steam pipeline is greater than the steam pressure of the power steam pipeline of the steam turbine.
The application has the advantages that:
(1) clean saturated steam or superheated steam is used for purifying the interior of the dustproof and anticorrosive steam turbine in the starting and stopping processes of the steam turbine, so that dust and corrosive substances of dirty steam can be fully prevented from being adhered to a rotating part of the steam turbine, and the rotating part cannot work due to unbalance; meanwhile, the other path of the dispersing corrosion inhibitor entering the steam turbine along with the dirty steam can effectively protect the internal parts of the steam turbine from being corroded.
(2) The steam and the dispersing corrosion inhibitor for maintenance are used for maintaining the interior of the steam turbine regularly, the operating environment in the steam turbine can meet the requirement of normal operation, the steam turbine can operate stably for a long time, the method has very important significance for energy conservation and emission reduction of a coal chemical gasification plant, and huge energy-saving benefits can be brought.
Drawings
FIG. 1 is a schematic structural diagram of the present application;
FIG. 2 is a schematic diagram of a conventional high-temperature water flash system;
FIG. 3 is a schematic structural diagram of a high-temperature water flash system after conventional steam turbine energy recovery and transformation;
FIG. 4 is a schematic structural diagram of a high-temperature water flash evaporation system obtained by modifying a conventional steam turbine energy recovery system according to the technical scheme of the patent;
FIG. 5 is a view showing the structure of a moving blade of a conventional steam turbine;
FIG. 6 is a view showing the structure of a lift-off blade without a page.
Detailed Description
The technical features of the present invention will be further explained with reference to the accompanying drawings and specific embodiments.
As shown in fig. 2, a chemical plant adopts a two-stage flash evaporation system, after high-temperature black water enters a high-pressure flash evaporation tank 31, saturated water vapor with the pressure of about 0.7MPa and containing a large amount of dust, corrosive media and combustible gas is generated at about 25T/H, and the saturated water vapor is partially or completely discharged, so that a large amount of energy waste and air pollution are caused; the drained water cooled by the high-pressure flash tank 31 enters a vacuum flash tank 32, vacuum flash evaporation is carried out in the vacuum flash tank 32, saturated steam with the pressure of about-35 KPa is produced, the steam enters a steam-water heat exchanger 33 and is cooled by circulating water, and heat is discharged; the drainage from the vacuum flash tank 32 is drained to the settling tank 34, and a3 and B3 in fig. 2 are a cooling water outlet and a cooling water inlet, respectively.
As shown in fig. 3, the system in fig. 3 is a high-temperature water flash system after conventional steam turbine energy recovery transformation. In the system shown in fig. 3, after entering a high-pressure flash tank 41, high-temperature black water generates saturated water vapor with the pressure of about 0.7MPa and containing a large amount of dust, corrosive media and combustible gas of about 25T/H, and the saturated water vapor enters a turbine 46 through a valve 43 and a turbine steam inlet safety device 45 to do work, so that a generator 47 is driven to generate electricity, and about 3600KW of effective electric energy is recovered; the drained water cooled by the high-pressure flash tank 41 enters a vacuum flash tank 42, vacuum flash evaporation is carried out after the drained water is placed in the vacuum flash tank 42, saturated steam with the pressure of about-35 KPa is produced, the steam is cooled by circulating water after all the steam enters a steam-water heat exchanger 44, and heat is discharged; the drainage of the vacuum flash tank 42 is discharged to a settling tank 48;
steam after work is done by the steam turbine 46 enters the high vacuum condenser 411 and is condensed into water, and the water is discharged to the sedimentation tank 48 through the condensate pump 49; the vacuum inside the high vacuum condenser 411 is established by the vacuum pump 410.
After the energy-saving transformation, the high-flash steam can save about 3600KW for enterprises, 2880 ten thousand degrees all the year around and save about 1400 thousand yuan of electric charge.
However, the above systems are not expected to operate effectively for long periods due to lack of countermeasures against dust and corrosive media in the steam. The operation period of the steam turbine is extremely short, and the longest time can not exceed half a year.
As shown in fig. 4, the system in fig. 4 is a high-temperature water flash evaporation system obtained by modifying a steam turbine purification system by using the present patent to a conventional steam turbine energy recovery system. In the technical scheme of the steam turbine waste heat recovery power generation energy saving shown in fig. 3, after the device and the operation method shown in the patent are added, the dispersed corrosion inhibitor stored in the dispersed corrosion inhibitor solution tank 12 can be pressurized by the dispersed corrosion inhibitor dosing pump 13, and is injected into the high flash steam pipeline through the dispersed corrosion inhibitor nozzle 5 to be mixed with the high flash steam, so as to purify the components inside the steam turbine 7; in addition, the maintenance steam valve 1 is opened in the starting and stopping process of the steam turbine 7, clean saturated steam or superheated steam is adopted to regularly purify the steam turbine 7, dust and corrosive substances in dirty steam can be fully prevented from being adhered to a rotating part of the steam turbine, and the long-term reliable operation of the steam turbine waste heat recovery power generation device shown in the figure 3 is ensured.
The operation of the solution of the present application is described below with reference to example 1.
Example 1
The embodiment is a dustproof and anticorrosive online maintenance system for a steam turbine, which comprises a steam turbine 7, a steam turbine power steam pipeline 6, a steam pipeline 8 for maintenance and a dispersing corrosion inhibitor pipeline 9, wherein the steam turbine power steam pipeline 6 is communicated with the inside of the steam turbine 7, power steam is introduced into the steam turbine 7 and drives moving parts in the steam turbine 7 to operate, and a power steam valve 2 is arranged on the steam turbine power steam pipeline 6. The maintenance steam pipeline 8 is communicated with the interior of the steam turbine 7, and a maintenance steam valve 1 is arranged on the maintenance steam pipeline 8. The dispersing corrosion inhibitor pipeline 9 is communicated with the interior of the steam turbine 7 through a steam turbine power steam pipeline 6; the dispersed corrosion inhibitor pipeline 9 feeds the dispersed corrosion inhibitor into the power steam pipeline 6 of the steam turbine, and the dispersed corrosion inhibitor is mixed with the power steam and then fed into the steam turbine 7.
In the technical scheme of this embodiment, two air inlet pipelines need to be added outside the original turbine power steam pipeline 6 of the turbine, wherein the maintenance steam pipeline 8 and the dispersed corrosion inhibitor pipeline 9 are added and can enter the turbine 7 through the turbine power steam pipeline 6, and only one valve needs to be added on the turbine power steam pipeline 6, the maintenance steam pipeline 8 and the dispersed corrosion inhibitor pipeline 9 respectively to control the on-off of the three pipelines respectively. The way can be used without reforming the body of the steam turbine 7, only the peripheral pipeline of the steam turbine is reformed, and the reforming construction difficulty is extremely low.
The maintenance steam pipeline 8 is used for introducing maintenance steam into the steam turbine 7, and the maintenance steam is used for purging the inner wall of the steam turbine 7, the turbine impeller, the main shaft and the turbine moving blades inside the steam turbine 7, so that dust and corrosive media in the power steam are prevented from being adhered to the inside of the steam turbine 7. The maintenance steam can be introduced into the steam turbine 7 at any time, but in order to achieve a good maintenance cleaning effect and reduce energy consumption, the maintenance steam is introduced for purging in the embodiment when the steam turbine 7 is in a shutdown process and moving parts inside the steam turbine 7 are still in a moving state.
The pressure of the power steam with dust and corrosive media is higher, so that the impeller and the blades can be driven, but the impact force of the power steam is also higher due to the high pressure, and the dust and the corrosive media are adhered to the inner wall of the steam turbine 7, the impeller and the movable blades by the impact force. In order to ensure that the maintenance steam can smoothly enter the steam turbine 7 and prevent dust and corrosive media from adhering inside the steam turbine 7, the maintenance steam needs to have a pressure higher than that of the motive steam, so in the present embodiment,
the pressure of the service steam in the service steam line 8 is set to be higher than the pressure of the power steam in the turbine power steam line 6 to ensure effective cleaning of the inside of the turbine 7.
The power steam introduced into the steam turbine 7 by the steam turbine power steam pipeline 6 is high-temperature grey water flash steam generated by the coal gasification device, so that the heat energy of the high-temperature grey water flash steam can be effectively recycled. The steam introduced into the steam turbine 7 by the corresponding maintenance steam pipeline 8 is clean saturated steam or superheated steam. In the practical application process, clean saturated steam or superheated steam is used as maintenance steam in the maintenance embodiment, and the purpose is to ensure better purification effect within limited maintenance time.
In this embodiment, all the moving blades in the steam turbine 7 are non-blade-top blades. The steam turbine moving blade structure in the prior art is composed of a blade root, a blade profile and a blade top, the blade top is connected together in groups according to needs, and the steam turbine moving blade structure has the following effects: the natural vibration frequency of the moving blade is changed to avoid resonance, so that the vibration safety of the moving blade is improved; however, in the present application, because the maintenance steam is used to purify the inside of the steam turbine, when the maintenance and purification are performed on the moving blade, the maintenance steam can bring the dust of the moving blade to the blade top, and the dust is accumulated at the blade top to hinder the removal of the dust, in the embodiment, the non-blade-top moving blade is adopted, and the anti-resonance design is performed on the non-blade-top moving blade to ensure that the dust accumulation is not generated in the maintenance process of the moving blade, and the self-oscillation is not generated at the same time, so that the long-term stable operation of the steam turbine is ensured.
The dispersing corrosion inhibitor pipeline 9 is used for introducing the dispersing corrosion inhibitor into the steam turbine 7, and the dispersing corrosion inhibitor is a mixture of a dispersing agent and a corrosion inhibitor. The pressure of the dispersed corrosion inhibitor is greater than the pressure of power steam of the steam turbine, and the dispersed corrosion inhibitor is continuously introduced in the normal working process of the steam turbine 7.
The corrosion inhibitor has the effects of preventing ions in the power steam from being adhered to the inner wall and the internal parts of the steam turbine, and the dispersing agent has the effects of enabling dust in the power steam to be more easily precipitated, so that the inner wall and the internal parts of the steam turbine can be prevented from being adhered with dust and dirt to a certain extent, the steam turbine can be kept in a stable working state in the long-term working process, and subsequent maintenance can be conveniently carried out. Therefore, the dispersing corrosion inhibitor needs to be introduced in the working process of the steam turbine 7 to achieve a better effect. Under the condition that the ventilation volume and the ventilation pressure of the power steam of the steam turbine 7 are large, the dispersion corrosion inhibitor needs to be continuously introduced in the working process of the steam turbine 7, so that a good dispersion corrosion inhibition effect can be achieved.
In this embodiment, one end of the dispersed corrosion inhibitor pipeline 9 is connected with the dispersed corrosion inhibitor solution tank 3, the dispersed corrosion inhibitor dosing pump 4 is arranged in the middle section of the dispersed corrosion inhibitor pipeline 9, and the dispersed corrosion inhibitor pipeline 9 pumps the dispersed corrosion inhibitor in the dispersed corrosion inhibitor solution tank 3 and conveys the dispersed corrosion inhibitor under pressure through the dispersed corrosion inhibitor dosing pump 4.
After a power steam valve 2 on a power steam pipeline 6 of the steam turbine is closed, when the steam turbine 7 is in a shutdown process but moving parts in the steam turbine 7 still keep a moving state, a maintenance steam pipeline 8 is used for introducing maintenance steam into the steam turbine 7; the time for introducing the maintenance steam into the turbine 7 was two hours.
The steam turbine maintenance state can be entered only when the power steam valve 2 is closed, and the maintenance steam valve 1 is completely opened at the moment, so that a large amount of maintenance steam enters the steam turbine 7 under the pressure higher than that of the power steam, and the inside of the steam turbine 7 is maintained. The maintenance time of the steam turbine can be kept for a longer time, and the longer the maintenance time is, the better the maintenance effect is. However, steam turbines are typically shut down for relatively short periods of time and have very long periods of continuous operation, so that there may not be as long a period of time for maintenance during actual operation. Therefore, in the present embodiment, the maintenance cleaning time is set to two hours. Below this time, the maintenance effect is not ideal. However, if the time is longer, the turbine may not have as long a down time, and since the longer the time is, the more the amount of steam is introduced, the higher the cost is, two hours is a solution that can ensure the maintenance effect and has a lower cost.
When the steam turbine 7 is in normal operation and the power steam valve 2 is opened, the maintenance steam valve 1 can be kept partially opened and the steam pressure in the maintenance steam pipeline 8 is larger than that of the steam turbine power steam pipeline 6.
In this embodiment, during the operation of the steam turbine 7 by delivering the power steam through the power steam pipeline 6, the maintenance steam valve 1 of the maintenance steam pipeline 8 may be partially opened, and at the same time, the maintenance steam is introduced at a small flow rate for maintenance during the operation of the steam turbine 7, so as to prevent the adhesion of dust and corrosive media inside the steam turbine. In the process that the steam turbine 7 is conveyed with power steam through the power steam pipeline 6 and operates, the time period for partially opening the maintenance steam valve 1 can be the whole operation process of the steam turbine 7, and can also be opened in different time periods. In the process that the steam turbine 7 is conveyed with power steam through the power steam pipeline 6 and operates, the time for partially opening the maintenance steam valve 1 is determined according to the condition that the interior of the steam turbine 7 is affected by dust and corrosive media.
The online maintenance method for the dust prevention and corrosion prevention of the steam turbine uses the online maintenance system for the dust prevention and corrosion prevention of the steam turbine, and comprises the following steps:
when the steam turbine 7 works normally, power steam is introduced into the steam turbine 7 through the steam turbine power steam pipeline 6; when the steam turbine 7 is in a shutdown process but moving parts in the steam turbine 7 still keep a moving state, opening a maintenance steam valve 1 of a maintenance steam pipeline 8, introducing maintenance steam into the steam turbine 7 through the maintenance steam pipeline 8, and purging the inner wall of the steam turbine 7 and the surfaces of the moving parts of the steam turbine 7 through the maintenance steam; the moving parts in the steam turbine 7 comprise a steam turbine main shaft, an impeller, a steam turbine moving blade and the like; steam which is introduced into the steam turbine 7 by the steam turbine power steam pipeline 6 is high-low temperature grey water flash steam generated by the coal gasification device. The maintenance steam pipeline 8 is used for introducing clean saturated steam or superheated steam into the steam turbine 7. The moving parts inside the steam turbine 7 include a steam turbine main shaft, an impeller and moving blades, and the moving blades of the steam turbine are non-top blades.
In the maintenance method of the present embodiment, the inside of the steam turbine 7 is maintained using the maintenance steam. In the maintenance process, the pressure of the maintenance steam is higher than that of the power steam, so that a better maintenance effect is achieved. In the actual use process, a plurality of and multistage steam nozzles are arranged in the steam turbine 7, maintenance steam is blown to the turbine moving blades through the steam nozzles to drive the impellers and the moving blades to move, the maintenance steam flows out from the back of each stage of moving blades and finally flows out from the last stage, and the impellers and the moving blades in the steam turbine can effectively purify the impellers and the moving blades of the steam turbine under the action of the maintenance steam and remove dust and corrosive media accumulated on the turbine impellers and the moving blades by the power steam. A part of the maintenance steam is directed to the part of the inner wall of the steam turbine 7 that needs to be cleaned, so that the inside of the steam turbine 7 can be cleaned more completely.
In the running process of moving parts in the power steam driven turbine 7, the dispersed corrosion inhibitor pipeline 9 leads the dispersed corrosion inhibitor into the turbine through the turbine power steam pipeline 6. The dispersion corrosion inhibitor is a mixture of a dispersant and a corrosion inhibitor. The pressure of the dispersed corrosion inhibitor is greater than the pressure of power steam of the steam turbine, and the dispersed corrosion inhibitor is continuously introduced in the normal working process of the steam turbine 7.
The introduction of the dispersing corrosion inhibitor can reduce the adhesion of dust and corrosive media in the steam turbine 7 and maintain the steam turbine 7 in a better working state in the operation process. Because of the continuous long-term working condition of the steam turbine 7, in this embodiment, the continuous introduction of the dispersion corrosion inhibitor has a higher cost, but the effect is better than that of the manner of introducing at different time intervals.
After a power steam valve 2 on a power steam pipeline 6 of the steam turbine is closed, when the steam turbine 7 is in a shutdown process but moving parts in the steam turbine 7 still keep a moving state, a maintenance steam pipeline 8 is used for introducing maintenance steam into the steam turbine 7; the time for introducing maintenance steam into the steam turbine 7 is more than or equal to two hours; the period of time for which maintenance steam is supplied to the interior of the turbine 7 is allowed to continue until the next start-up of the turbine 7.
When the steam turbine 7 is in normal operation and the power steam valve 2 is opened, the maintenance steam valve 1 can be kept partially opened and the steam pressure in the maintenance steam pipeline 8 is larger than that of the steam turbine power steam pipeline 6.
Example 2
This example differs from example 1 in that: when the turbine 7 is restarted after being stopped, the maintenance steam line 8 supplies maintenance steam to the inside of the turbine 7 and purges the inner wall of the turbine 7 and the surfaces of the moving parts of the turbine 7.
In this embodiment, the maintenance time inside the steam turbine 7 is set in the process of restarting the steam turbine 7 after stopping the steam turbine 7, and when restarting the steam turbine 7 after stopping the steam turbine 7 and maintaining the inside of the steam turbine 7, it is necessary to close the power steam valve 2 and open the maintenance steam valve 1 to introduce maintenance steam into the inside of the steam turbine 7. The maintenance time at this time, that is, the time for introducing the maintenance steam into the steam turbine 7 is at least two hours, so that a good purification effect can be ensured.
In this embodiment, the dispersing corrosion inhibitor may be introduced into the turbine 7 at regular intervals and in different periods, which is less costly than the method of embodiment 1, but the effect is also reduced, and in the actual use process, it may be selected according to the actual working conditions of the turbine 7.
The dispersing corrosion inhibitor is introduced at certain time intervals in the normal working process of the steam turbine 7 in different time periods.
After the power steam valve 2 on the power steam pipeline 6 of the steam turbine is closed, when the steam turbine 7 is in the shutdown process but the moving parts in the steam turbine 7 still keep moving states, the maintenance steam pipeline 8 introduces maintenance steam into the steam turbine 7, and the time for introducing the maintenance steam into the steam turbine 7 is continued until the next startup of the steam turbine 7.
In this embodiment, after the steam turbine 7 is stopped and before the steam turbine 7 is started next time, maintenance steam is introduced into the steam turbine 7, the maintenance steam is introduced for a long time, and the corresponding maintenance effect is better. It should be noted here that in this embodiment the period of time for which maintenance steam is passed should be at least two hours, i.e. the turbine 7 needs to be shut down for at least two hours.
Example 3
This embodiment differs from the above embodiment in that:
the dispersed corrosion inhibitor pipeline 9 is directly communicated with the interior of the steam turbine 7 and is used for introducing the dispersed corrosion inhibitor into the steam turbine 7. In this example, the dispersed corrosion inhibitor pipe 9 directly feeds the dispersed corrosion inhibitor into the turbine, but the mixing effect of the dispersed corrosion inhibitor and the motive steam is inferior to that in the embodiment 1. In order to improve the distribution uniformity of the dispersed corrosion inhibitor in the turbine, different pipelines can be used to spray the dispersed corrosion inhibitor to different parts in the turbine.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art should understand that they can make various changes, modifications, additions and substitutions within the spirit and scope of the present invention.
Claims (10)
1. A dustproof and anticorrosive online maintenance and protection system for a steam turbine comprises the steam turbine (7) and a steam turbine power steam pipeline (6), wherein the steam turbine power steam pipeline (6) is communicated with the inside of the steam turbine (7) and introduces power steam into the steam turbine (7), the power steam drives a moving part in the steam turbine (7) to operate, and a power steam valve (2) is arranged on the steam turbine power steam pipeline (6); the method is characterized in that: the steam pipeline (8) for maintenance is communicated with the interior of the steam turbine (7), and a steam valve (1) for maintenance is arranged on the steam pipeline (8) for maintenance;
when the steam turbine (7) is in a shutdown process but the moving parts in the steam turbine (7) still keep a moving state, introducing maintenance steam into the steam turbine (7) through a maintenance steam pipeline (8) and purging the inner wall of the steam turbine (7) and the surfaces of the moving parts of the steam turbine (7) through the maintenance steam;
or when the steam turbine (7) is restarted after being stopped, the maintenance steam pipeline (8) introduces maintenance steam into the steam turbine (7) and sweeps the inner wall of the steam turbine (7) and the surface of the moving part of the steam turbine (7);
the pressure of the maintenance steam in the maintenance steam pipeline (8) is greater than the pressure of the power steam in the power steam pipeline (6) of the steam turbine.
2. The online maintenance system for dust prevention and corrosion prevention of the steam turbine according to claim 1, characterized in that: the power steam introduced into the steam turbine (7) by the steam turbine power steam pipeline (6) is high-temperature grey water flash steam generated by the coal gasification device; the maintenance steam pipeline (8) introduces clean saturated steam or superheated steam into the steam turbine (7); the moving parts in the steam turbine (7) comprise a steam turbine impeller, a main shaft, steam turbine moving blades and the like, and all the moving blades of the steam turbine are non-top-blade blades.
3. The online maintenance system for dust prevention and corrosion prevention of the steam turbine according to claim 1, characterized in that: also comprises a dispersed corrosion inhibitor pipeline (9);
the dispersing corrosion inhibitor pipeline (9) is communicated with the interior of the steam turbine (7) through a steam turbine power steam pipeline (6); the dispersed corrosion inhibitor pipeline (9) introduces the dispersed corrosion inhibitor into the steam turbine power steam pipeline (6), and the dispersed corrosion inhibitor is mixed with the power steam and then introduced into the steam turbine (7);
or the dispersed corrosion inhibitor pipeline (9) is directly communicated with the interior of the steam turbine (7) and the dispersed corrosion inhibitor is introduced into the steam turbine (7);
the dispersing corrosion inhibitor is a mixture of a dispersing agent and a corrosion inhibitor; the pressure of the dispersing corrosion inhibitor is greater than the pressure of power steam of the turbine; the dispersing corrosion inhibitor can be continuously introduced in the normal working process of the steam turbine (7), or the dispersing corrosion inhibitor can be introduced at certain time intervals in the normal working process of the steam turbine (7).
4. The online maintenance system for dust prevention and corrosion prevention of the steam turbine according to claim 1, characterized in that:
after a power steam valve (2) on a power steam pipeline (6) of the steam turbine is closed, when the steam turbine (7) is in a shutdown process but a moving part in the steam turbine (7) still keeps a moving state, a maintenance steam pipeline (8) introduces maintenance steam into the steam turbine (7); the time for introducing maintenance steam into the steam turbine (7) is more than or equal to two hours; the time for introducing maintenance steam into the steam turbine (7) is allowed to continue until the next startup of the steam turbine (7);
or when the steam turbine (7) is restarted after being stopped, the power steam valve (2) is closed, the maintenance steam valve (1) is opened, maintenance steam is introduced into the steam turbine (7) through the maintenance steam pipeline (8), and the time for introducing the maintenance steam into the steam turbine (7) is more than or equal to two hours.
5. The online maintenance system for dust prevention and corrosion prevention of the steam turbine according to claim 1, characterized in that: when the steam turbine (7) operates normally and the power steam valve (2) is opened, the maintenance steam valve (1) can be kept partially opened, and the steam pressure in the maintenance steam pipeline (8) is larger than that of the steam pressure in the steam turbine power steam pipeline (6).
6. A dustproof and anticorrosion online maintenance method for a steam turbine is characterized by comprising the following steps: the online maintenance system for the dust prevention and corrosion prevention of the steam turbine according to claims 1 to 4 is adopted, and comprises the following steps:
when the steam turbine (7) works normally, power steam is introduced into the steam turbine (7) through the steam turbine power steam pipeline (6);
when the steam turbine (7) is in a shutdown process but moving parts in the steam turbine (7) still keep a moving state, opening a maintenance steam valve (1) of a maintenance steam pipeline (8), introducing maintenance steam into the steam turbine (7) through the maintenance steam pipeline (8), and purging the inner wall of the steam turbine (7) and the surfaces of the moving parts of the steam turbine (7) through the maintenance steam;
or when the steam turbine (7) is started, opening a maintenance steam valve (1) of a maintenance steam pipeline (8), introducing maintenance steam into the steam turbine (7) through the maintenance steam pipeline (8), and purging the inner wall of the steam turbine (7) and the surface of a moving part of the steam turbine (7);
the moving parts in the steam turbine (7) comprise a turbine impeller, a main shaft, a turbine moving blade and the like.
7. The online maintenance method for the dust prevention and corrosion prevention of the steam turbine according to claim 6, characterized in that: steam introduced into the steam turbine (7) by the steam turbine power steam pipeline (6) is high-temperature grey water flash steam generated by the coal gasification device; the maintenance steam pipeline (8) introduces clean saturated steam or superheated steam into the steam turbine (7); the moving parts in the steam turbine (7) comprise a steam turbine main shaft, an impeller, steam turbine moving blades and the like, and all the moving blades of the steam turbine are non-top-blade blades.
8. The online maintenance method for the dust prevention and corrosion prevention of the steam turbine according to claim 6, characterized in that: in the running process of moving parts in a power steam driven steam turbine (7), a dispersed corrosion inhibitor pipeline (9) leads dispersed corrosion inhibitor into the steam turbine through a steam turbine power steam pipeline (6) or directly leads the dispersed corrosion inhibitor into the steam turbine;
the dispersing corrosion inhibitor is a mixture of a dispersing agent and a corrosion inhibitor; the pressure of the dispersing corrosion inhibitor is greater than the pressure of steam of the power of the turbine; the dispersing corrosion inhibitor can be continuously introduced in the normal working process of the steam turbine (7), or the dispersing corrosion inhibitor can be introduced at certain time intervals in the normal working process of the steam turbine (7).
9. The online maintenance system for dust prevention and corrosion prevention of the steam turbine according to claim 6, characterized in that:
after a power steam valve (2) on a power steam pipeline (6) of the steam turbine is closed, when the steam turbine (7) is in a shutdown process but a moving part in the steam turbine (7) keeps a moving state, a maintenance steam pipeline (8) introduces maintenance steam into the steam turbine (7); the time for introducing maintenance steam into the steam turbine (7) is more than or equal to two hours; the time for introducing maintenance steam into the steam turbine (7) is allowed to continue until the next startup of the steam turbine (7);
or when the steam turbine (7) is restarted after being stopped, the power steam valve (2) is in a closed state, the maintenance steam valve (1) is opened, maintenance steam is introduced into the steam turbine (7) through the maintenance steam pipeline (8), and the time for introducing the maintenance steam into the steam turbine (7) is more than or equal to two hours.
10. The online maintenance system for dust prevention and corrosion prevention of the steam turbine according to claim 1, characterized in that: when the steam turbine (7) operates normally and the power steam valve (2) is opened, the maintenance steam valve (1) can be kept partially opened, and the steam pressure in the maintenance steam pipeline (8) is larger than that of the steam pressure in the steam turbine power steam pipeline (6).
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102562301A (en) * | 2011-01-03 | 2012-07-11 | 通用电气公司 | Combustion turbine purge system and method of assembling same |
| US20130291945A1 (en) * | 2012-05-03 | 2013-11-07 | General Electric Company | Continuous purge system for a steam turbine |
| CN105201567A (en) * | 2015-09-06 | 2015-12-30 | 苏州市江远热电有限责任公司 | Steam turbine circulation part cleaning system and cleaning method |
| CN205172648U (en) * | 2015-10-14 | 2016-04-20 | 安徽华尔泰化工股份有限公司 | Steam turbine cleaning device |
| WO2017055002A1 (en) * | 2015-09-30 | 2017-04-06 | Siemens Aktiengesellschaft | Active wet-steam cleaning method for steam turbines |
| CN109763867A (en) * | 2019-03-15 | 2019-05-17 | 山东康格能源科技有限公司 | A kind of method and system of Turbine Flow Path scale removal |
| CN111810257A (en) * | 2020-08-10 | 2020-10-23 | 西安热工研究院有限公司 | Flushing system and flushing method for salt deposit of power station steam turbine |
| CN212296511U (en) * | 2020-08-10 | 2021-01-05 | 西安热工研究院有限公司 | Flushing system for salt deposit of power station steam turbine |
| CN213793058U (en) * | 2020-09-29 | 2021-07-27 | 中天合创能源有限责任公司 | Online descaling system based on steam turbine superheated steam admission |
| CN113187574A (en) * | 2021-05-08 | 2021-07-30 | 青岛华捷汽轮机有限公司 | Waste heat power generation system of ash water true-flashing negative-pressure wet steam turbine of coal gasification device |
-
2021
- 2021-12-09 CN CN202111499477.5A patent/CN114278398B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102562301A (en) * | 2011-01-03 | 2012-07-11 | 通用电气公司 | Combustion turbine purge system and method of assembling same |
| US20130291945A1 (en) * | 2012-05-03 | 2013-11-07 | General Electric Company | Continuous purge system for a steam turbine |
| CN105201567A (en) * | 2015-09-06 | 2015-12-30 | 苏州市江远热电有限责任公司 | Steam turbine circulation part cleaning system and cleaning method |
| WO2017055002A1 (en) * | 2015-09-30 | 2017-04-06 | Siemens Aktiengesellschaft | Active wet-steam cleaning method for steam turbines |
| CN205172648U (en) * | 2015-10-14 | 2016-04-20 | 安徽华尔泰化工股份有限公司 | Steam turbine cleaning device |
| CN109763867A (en) * | 2019-03-15 | 2019-05-17 | 山东康格能源科技有限公司 | A kind of method and system of Turbine Flow Path scale removal |
| CN111810257A (en) * | 2020-08-10 | 2020-10-23 | 西安热工研究院有限公司 | Flushing system and flushing method for salt deposit of power station steam turbine |
| CN212296511U (en) * | 2020-08-10 | 2021-01-05 | 西安热工研究院有限公司 | Flushing system for salt deposit of power station steam turbine |
| CN213793058U (en) * | 2020-09-29 | 2021-07-27 | 中天合创能源有限责任公司 | Online descaling system based on steam turbine superheated steam admission |
| CN113187574A (en) * | 2021-05-08 | 2021-07-30 | 青岛华捷汽轮机有限公司 | Waste heat power generation system of ash water true-flashing negative-pressure wet steam turbine of coal gasification device |
Non-Patent Citations (1)
| Title |
|---|
| 发电厂热力设备化学清洗单位资质评定委员会: "《火电厂热力设备化学清洗培训教材》", 30 June 2007 * |
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