CN213495179U - Steam turbine rotor scale deposit clearance system - Google Patents
Steam turbine rotor scale deposit clearance system Download PDFInfo
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- CN213495179U CN213495179U CN202021239163.2U CN202021239163U CN213495179U CN 213495179 U CN213495179 U CN 213495179U CN 202021239163 U CN202021239163 U CN 202021239163U CN 213495179 U CN213495179 U CN 213495179U
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Abstract
The utility model discloses a scale cleaning system for a steam turbine rotor, which comprises a steam conveying mechanism and a medicament adding mechanism which are communicated with a main steam pipeline of a steam turbine, wherein the steam conveying mechanism comprises a second control valve which is arranged on an air supply pipeline connected with a descaling steam source, and the air supply pipeline is communicated with the main steam pipeline through a first control valve; the medicament adding mechanism comprises a desalted water adding mechanism, the desalted water adding mechanism comprises a desalted water tank, a first pressure pump and a fourth control valve, the desalted water tank is communicated with a first infusion tube, the first infusion tube is communicated with the first control valve through the third control valve, and the first pressure pump and the fourth control valve are sequentially arranged on the first infusion tube along the infusion direction; each control valve and the first pressure pump are connected with the controller. The utility model aims at providing a scale deposit cleaning performance is good, easy operation is high-efficient, have good economic benefits's steam turbine rotor scale deposit clearance system.
Description
Technical Field
The utility model belongs to the steam turbine washs the field, concretely relates to steam turbine rotor scale deposit clearance system.
Background
At present, when the steam turbine is used, the steam entering the steam turbine carries impurities such as SiO more or less always2、Na+And other metal ions, wherein the impurities are adhered and deposited on the surface of the blade to form scale deposit along with steam flow, the scale deposit makes the surface of the blade rough and the profile change, a steam flow passage is narrowed, the output of the steam turbine is reduced due to flow reduction and efficiency reduction, and the axial thrust is increased due to the scale deposit of the blade. The scale deposit not only increases the bending stress and centrifugal stress of the blade, but also easily causes corrosion to shorten the service life of the blade; meanwhile, the scale deposit can also cause the jamming faults of the quick-closing valve and the regulating valve rod. Most of the scale comprises salt deposit and silica scale, wherein the salt deposit is mainly water-soluble NaCl and Na2SO4Silicates, etc., SiO with different crystals in the silica scale2，SiO2Has strong scaling capability, is very hard and is insoluble in water.
The traditional cleaning method comprises physical mechanical cleaning and chemical cleaning, wherein the physical mechanical cleaning method comprises the steps of opening a cylinder, lifting out a rotor, checking the scaling condition of a blade and a through-flow part, and cleaning by adopting methods such as manual cleaning, hydraulic honing, sanding, shot blasting and the like; the physical cleaning method consumes about ten days, is suitable for incompatible salt scaling, and is suitable for cleaning incompatible salt scaling, and the physical mechanical cleaning is thorough, but the steam turbine needs to be uncovered, and the rotor is lifted out for cleaning, so that the time consumption is long, and the cost is high. For the chemical cleaning method, chemicals are added into cleaning solution or steam for cleaning, such as NaOH solution, the time consumption of the cleaning method is generally about 5 days, the control is strict, if the control is not good, the turbine blade is easy to corrode, and a professional cleaning company is required to process, so that higher maintenance cost is generated.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects of the prior art, the utility model aims to provide a steam turbine rotor scale deposit clearance system that scale deposit cleaning performance is good, easy operation is high-efficient, good economic benefits has.
In order to realize the purpose, the utility model discloses a technical scheme be:
a scale cleaning system for a steam turbine rotor comprises a steam conveying mechanism and a medicament adding mechanism which are communicated with a main steam pipeline of a steam turbine, wherein the steam conveying mechanism comprises a second control valve which is arranged on a gas supply pipeline connected with a descaling steam source, and the gas supply pipeline is communicated with the main steam pipeline through a first control valve;
the medicament adding mechanism comprises a desalted water adding mechanism, the desalted water adding mechanism comprises a desalted water tank, a first pressure pump and a fourth control valve, the desalted water tank is communicated with a first infusion tube, the first infusion tube is communicated with the first control valve through the third control valve, and the first pressure pump and the fourth control valve are sequentially arranged on the first infusion tube along the infusion direction; each control valve and the first pressure pump are connected with the controller.
Preferably, the medicament adding device further comprises a cleaning agent adding mechanism, the cleaning agent adding mechanism comprises a cleaning agent tank, a second pressure pump and a fifth control valve, the cleaning agent tank is communicated with a second infusion tube, the second infusion tube is communicated with a third control valve, and the second pressure pump and the fifth control valve are arranged on the second infusion tube along the infusion direction; the second pressure pump and the fifth control valve are connected with the controller.
Preferably, the cleaning agent conveyed in the cleaning agent tank is phosphoric acid cleaning solution.
Preferably, the third control valve is also communicated with a back-pouring discharge pipe, and the back-pouring discharge pipe is provided with a sixth control valve.
Preferably, the system also comprises a condensate treatment mechanism, the condensate treatment mechanism comprises a tank body and a condensate detection device, and a liquid inlet of the tank body is communicated with a condensate discharge port of the steam turbine through a seventh control valve; a filtering mechanism is arranged inside the tank body; the condensate detection device is arranged at the bottom of the tank body; an eighth control valve is arranged at the liquid discharge port of the tank body.
Preferably, the filtering mechanism comprises a first filtering layer and a second filtering layer which are distributed from top to bottom, the first filtering layer is made of a stainless steel coarse filter screen, and the second filtering layer is made of a dense filter screen material with good water permeability.
Preferably, the condensate detection device comprises a conductivity detection device, a sodium ion concentration detection device and a silicon dioxide detection device.
Preferably, a stop valve, a quick closing valve and an adjusting valve are sequentially arranged on the main steam pipeline along the steam feeding direction to the steam turbine, and the first control valve is communicated between the quick closing valve and the stop valve of the main steam pipeline.
The utility model discloses the beneficial effect who has does:
1. compared with the prior art, the cleaning time of the physical mechanical method is time-consuming and laborious, and the technical difficulty of the chemical cleaning method is large and the price is high, the utility model discloses a descaling steam is sent into by the air supply pipeline, and the desalting water is mixed into in the descaling steam by the desalting water adding mechanism, the salt scale and the silicon scale in the steam turbine and on the rotor are dissolved and cleaned, and after the sampling analysis of sodium ion, silicon dioxide, conductivity and the like in the condensate detected by the condensate detecting device, the controller controls the cleaning agent adding mechanism to add the phosphoric acid cleaning agent into the descaling steam, thereby accelerating the scaling cleaning; the cleaning system of the utility model has high cleaning efficiency, the cleaning operation can be completed within 48 hours generally, and the cleaning efficiency of the system is high; the steam turbine can be cleaned by controlling the coordinated action of each control valve and the pressure pump through the controller, and the operation is simple and convenient.
2. Through the filter layer of two-layer setting of filtering mechanism, can filter the caking dirt in the exhaust condensate after the steam turbine washs, effectively prevent the jam of caking dirt in drainage pipe, effectively improve the stability of cleaning system operation.
3. The utility model discloses jar body bottom sets up by condensate detection device, detection device such as conductivity detection device, sodium ion detection device and silica detection device that link to each other with the controller can carry out real-time supervision to sodium ion concentration, silica concentration, conductivity isoparametric index in the steam turbine discharge condensate to give the controller with the data feedback that detects, in order to realize washing back condensate real-time supervision to the steam turbine, make the scale deposit cleaning degree of staff's real-time observation steam turbine.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The system for cleaning scale on the rotor of the steam turbine shown in fig. 1 comprises a steam conveying mechanism and a chemical adding mechanism which are communicated with a main steam pipeline 20 of the steam turbine 1, wherein the steam conveying mechanism comprises a second control valve 41, the second control valve 41 is arranged on a gas supply pipeline 40 connected with a descaling steam source, and the gas supply pipeline 40 is communicated with the main steam pipeline 20 through a first control valve 31. When the steam turbine 1 with the model number of NK40/56 is subjected to scale cleaning, the steam input into the air supply pipeline 40 from the scale removing steam source can adopt 0.5MPa steam to perform rotor scale cleaning operation. A cut-off valve 21, a quick-closing valve 22 and an adjusting valve 23 are sequentially arranged on the main steam pipeline 20 along the steam feeding direction to the steam turbine 1, the first control valve 31 is communicated between the quick-closing valve 22 of the main steam pipeline 20 and the cut-off valve 21, when the steam turbine 1 is cleaned, the main steam pipeline 20 is closed through the cut-off valve 21 to cut off a main steam source, and then the cleaning steam entering the rotor of the steam turbine 1 can be effectively regulated and controlled by the quick-closing valve 22 and the adjusting valve 23.
The medicament adding mechanism comprises a desalted water adding mechanism and a cleaning agent adding mechanism, wherein the desalted water adding mechanism comprises a desalted water tank 613, a first pressure pump 612 and a fourth control valve 611, the desalted water tank 613 is communicated with a first infusion tube 610, the first infusion tube 610 is communicated with the first control valve 31 through a third control valve 51, and the first pressure pump 612 and the fourth control valve 611 are sequentially arranged on the first infusion tube 610 along the infusion direction; the desalted water entering the first liquid conveying pipe 610 from the desalted water tank 613 is pressurized and conveyed by the first pressure pump 612, sequentially passes through the fourth control valve 611 and the third control valve 51, is mixed with the descaling steam, and is conveyed into the steam turbine 1 from the first control valve 31, so that the scale on the rotor of the steam turbine 1 is cleaned. The cleaning agent adding mechanism comprises a cleaning agent tank 623, a second pressure pump 622 and a fifth control valve 621, the cleaning agent tank 623 is communicated with a second infusion tube 620, the second infusion tube 620 is communicated with a third control valve 51, and the second pressure pump 622 and the fifth control valve 621 are arranged on the second infusion tube 620 along the infusion direction; the cleaning agent in the cleaning agent tank 623 can be phosphoric acid cleaning solution, and can effectively neutralize and dissolve salt deposition and silica scale in the scale. When the device is used, after sodium ions, silicon dioxide, conductivity and the like in the condensate detected by the condensate detection device 83 are sampled and analyzed, according to the actual cleaning condition, when the cleaning is incomplete, the cleaning agent tank 623 conveys the cleaning agent into the descaling steam through the pressurization of the second pressure pump 622 sequentially through the fifth control valve 621 and the third control valve 51, and then the phosphoric acid cleaning agent is mixed into the descaling steam, so that the turbine 1 is effectively and thoroughly cleaned.
The third control valve 51 is also communicated with a back-pouring discharge pipe 70, the back-pouring discharge pipe 70 is provided with a sixth control valve 71, and the back-pouring discharge pipe 70 is controlled to be opened and closed through the sixth control valve 71, so that the back-pouring discharge operation of the whole system is realized.
When steam scaling cleaning is carried out, the accumulated salt is dissolved and taken away by the condensed water of saturated steam, and the scale layer is salt and SiO2The mixture is scaled, after the water-soluble compound is washed away, by the water-insoluble SiO2The scale layer can be broken down, at the moment, the caked scale can fall off, and if the caked scale is directly discharged from the sewage pipe, the blockage of the sewage pipe and the discharge of condensate liquid are easily causedCausing an impact. In order to solve the problems, the utility model provides a steam turbine rotor scale deposit clearance system still includes condensate treatment mechanism, and condensate treatment mechanism includes jar body 8 and condensate detection device 83, and the inlet of jar body 8 is linked together through seventh control valve 11 and steam turbine 1's condensate discharge port; a filtering mechanism is arranged inside the tank body 8; an eighth control valve 84 for controlling the discharge of the condensate is arranged at the liquid discharge port of the tank 8. Wherein the filtering mechanism comprises a first filtering layer 81 and a second filtering layer 82 which are distributed up and down, wherein the first filtering layer 81 adopts a coarse filter screen made of stainless steel materials, and the second filtering layer 82 adopts a dense filter screen material with good water permeability. Through the filter layer of two-layer setting of filter mechanism, can filter the caking dirt in the exhaust condensate after steam turbine 1 washs, effectively prevent the jam of caking dirt in drainage pipe, effectively improve the stability of cleaning system operation.
When the utility model is used for cleaning the turbine 1 with NK40/56 model, the coupling of the turbine 1 and the compressor is firstly separated, so that the turbine 1 is in a single machine operation state; controlling the action of a cut-off valve 21 on a main steam pipeline 20 through a controller, cutting off a main steam source, opening a quick-closing valve 22 and a regulating valve 23 of the steam turbine 1, and turning the steam turbine 1; conveying descaling steam of 0.5MP to the steam turbine 1 through the second control valve 41 and the first control valve 31, and turning the steam turbine 1, and simultaneously conveying the desalted water in the desalted water tank 613 into the descaling steam through the third control valve 51 by controlling the fourth control valve 611 and the first pressure pump 612 of the desalted water adding mechanism, so as to effectively and completely clean the scale on the rotor of the steam turbine 1; after the steam turbine 1 is cleaned, the condensate is discharged into the tank 8 through the opened seventh control valve 11 and then is discharged and treated through a water outlet provided with an eighth control valve 84, wherein the condensate is filtered by a filtering mechanism to filter caking and dirt, so that the water discharge pipeline is prevented from being blocked.
Wherein, in the initial stage of cleaning, in order to prevent the steam turbine 1 from accidents such as liquid impact, abnormal vibration value and the like, the rotating speed of the steam turbine 1 is controlled at 150 rpm; checking the operation condition of the unit, gradually increasing the rotating speed to 300 rpm if the unit is operated well, continuously operating for 12 hours at the rotating speed, carrying out real-time analysis on the parameters such as the conductivity, the sodium ion concentration and the silicon dioxide concentration of the condensate of the steam turbine 1 through the condensate detection device 83 during the operation, and introducing the phosphoric acid cleaning agent in the cleaning agent tank 623 into the descaling steam through the fifth control valve 621 and the second pressure pump 622 according to the analysis index of the condensate; after 12h, the rotating speed of the turbine 1 is increased to about 1000rpm, the turbine 1 is cleaned for about 48h, and then the turbine 1 is stopped to finish the cleaning operation if various analysis indexes in the condensate are close to the indexes of fresh desalted water.
Claims (8)
1. The utility model provides a steam turbine rotor scale deposit clearance system, includes that the steam conveying mechanism and the medicament that are linked together with the main steam pipeline of steam turbine add the mechanism, its characterized in that: the steam conveying mechanism comprises a second control valve, the second control valve is arranged on a gas supply pipeline connected with the descaling steam source, and the gas supply pipeline is communicated with the main steam pipeline through a first control valve;
the medicament adding mechanism comprises a desalted water adding mechanism, the desalted water adding mechanism comprises a desalted water tank, a first pressure pump and a fourth control valve, the desalted water tank is communicated with a first infusion tube, the first infusion tube is communicated with the first control valve through the third control valve, and the first pressure pump and the fourth control valve are sequentially arranged on the first infusion tube along the infusion direction; each control valve and the first pressure pump are connected with the controller.
2. The steam turbine rotor fouling cleaning system of claim 1, wherein: the cleaning agent adding mechanism comprises a cleaning agent tank, a second pressure pump and a fifth control valve, the cleaning agent tank is communicated with a second infusion tube, the second infusion tube is communicated with a third control valve, and the second pressure pump and the fifth control valve are arranged on the second infusion tube along the infusion direction; the second pressure pump and the fifth control valve are connected with the controller.
3. The steam turbine rotor fouling cleaning system of claim 2, wherein: the cleaning agent conveyed in the cleaning agent tank is phosphoric acid cleaning solution.
4. The steam turbine rotor fouling cleaning system of claim 3, wherein: and the third control valve is also communicated with a back-pouring discharge pipe, and the back-pouring discharge pipe is provided with a sixth control valve.
5. The steam turbine rotor fouling cleaning system of claim 4, wherein: the device comprises a steam turbine, a condensate treatment mechanism and a control system, wherein the steam turbine also comprises a condensate treatment mechanism, the condensate treatment mechanism comprises a tank body and a condensate detection device, and a liquid inlet of the tank body is communicated with a condensate discharge port of the steam turbine through a seventh control valve; a filtering mechanism is arranged inside the tank body; the condensate detection device is arranged at the bottom of the tank body; an eighth control valve is arranged at the liquid discharge port of the tank body.
6. The steam turbine rotor fouling cleaning system of claim 5, wherein: the filtering mechanism comprises a first filtering layer and a second filtering layer which are distributed up and down; the first filter layer adopts a stainless steel coarse filter screen, and the second filter layer adopts a dense filter screen material.
7. The steam turbine rotor fouling cleaning system of claim 5, wherein: the condensate detection device comprises a conductivity detection device, a sodium ion concentration detection device and a silicon dioxide detection device.
8. The steam turbine rotor fouling cleaning system of claim 1, wherein: the main steam pipeline is sequentially provided with a stop valve, a quick-closing valve and an adjusting valve along the steam feeding direction to the steam turbine, and the first control valve is communicated between the quick-closing valve and the stop valve of the main steam pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021239163.2U CN213495179U (en) | 2020-06-30 | 2020-06-30 | Steam turbine rotor scale deposit clearance system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021239163.2U CN213495179U (en) | 2020-06-30 | 2020-06-30 | Steam turbine rotor scale deposit clearance system |
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| Publication Number | Publication Date |
|---|---|
| CN213495179U true CN213495179U (en) | 2021-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021239163.2U Active CN213495179U (en) | 2020-06-30 | 2020-06-30 | Steam turbine rotor scale deposit clearance system |
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| CN (1) | CN213495179U (en) |
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- 2020-06-30 CN CN202021239163.2U patent/CN213495179U/en active Active
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