Tube Serpentuator Gas Shielded Arc Welding Boiler Revamping And Modification Coil
Product Details
| Material: | SA213-TP3471H | Length: | 12000mm |
|---|---|---|---|
| Specification: | OD=42,Thickness=5mm | PWHT: | Solution Treatment |
| Ovality: | Less Than 15% | Thickness Reduce: | Less Than 15% |
| Highlight |
convection superheater,superheater in boiler |
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Product Description
Superheater and reheater tube serpentuator gas shielded arc welding revamping and modification
Superheater & Reheater Serpentuator
Description
| The temperature of steam in boilers depends on the pressure but whilst it is in contact with the water it never exceeds the boiling point for that pressure. |
| This is referred to as the "saturated steam" temperature. So long as the pressure and temperature remain the same the steam will not contain water and is referred to as "dry saturated steam". |
| As the steam travels from the boiler to the engine,however,despite insulation of the pipework etc,it will experience a drop in temperature and condensation will immediately result. |
| Condensation will also occur when the steam comes into contact with the cooler cylinder walls and,as energy is extracted from the steam in the cylinders by performing work on the piston, a further drop in temperature will occor resulting in further condensation. |
| Apart from the resulting loss of efficiency,the presence of incompressible liquid water in the cylinder is potentially disastrous. |
| If it were trapped between the piston and the cylinder end-cap it could result in the end being blown off. |
Advantages & Disadvantages
|
Pendant-type 1.Firm structural support 1. Flow blockage by condensed steam 2. Needs slow restart to purge the water that accumulates in the bottom. supported from above |
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Inverted-type 1.Proper drainage of the condensed steam 1. Lack the structural rigidity, especially in high speed gas flow Supported from below |
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Horizontal -type 1. Proper drainage 2. Good structural rigidity. |
They do not view the flam directly so they are mainly from the convective type Usually supported in the vertical gas ducts parallel to the main furnace.
Historical review
| ·Steam-dryers and steam-traps can remove condensed water from the pipes,and steam-jacketing can reduce cylinder condensation they do not eliminate the problem. |
| ·It was realised in the 19th century that once the steam was removed from proximity with water in the boiler it could receive additional heat and its temperature could be raise above the boiling point. |
| ·This is referred to as "superheating". |
| ·With sufficient additional heat,the rise in the temperature of the steam would more than compensate for the fall in temperature as it passed through the pipe-work and engine and condensation could be eliminated. |
| ·Tube failure is one of the leading causes of forced outages in power plants. One of the key ways of preventing failure is to predict the remaining useful life of tubes. |
| ·By gaining an accurate assessment of the predicted lifespan of the tube, power plant operators have the necessary information to make decisions on prioritising future inspections, and whether to run, repair or replace tubes. |
| ·How we analyse the remaining useful life of tubes: |
| ·The lifespan of a superheater or reheater tube is affected by time, temperature and stress. |
| ·To measure the remaining useful life of the tube, information on the steam pressure, original and present wall thicknesses and the tube’s outside diameter (OD) is used to calculate the stress history of the tube. |
| ·The steamside scale thickness is used to gauge the effective temperature history of the tube. |
| ·The stress history and the effective temperature history are compared to the creep rupture material of the specified tube material. From this information, the remaining useful life of the tube can be calculated – as well as the temperature profiles across the boiler. |
| ·Hot spots and wastage patterns can also be identified. |
Product Function
| The function of the superheater in the thermal power plant is to remove the last traces of moisture ( 1 to 2%) from the saturated steam coming out of boiler and to increase its temperature sufficiently above saturation temperature. |
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The super-heating heating raises overall overall cycle efficiency efficiency as well as avoids too much condensation in the last stages of the turbine which avoids the blade erosion. |
| The heat of combustion gases from furnace is utilized for the removal of moisture from steam and to superheat the steam. |
| Super-heaters usually have several tube circuits in parallel with one or more return bends, connected between headers. |
GMAW
Product Highlights
Superheater and reheater tube serpentuator gas shielded arc welding revamping and modification Superheater & Reheater Serpentuator Description The temperature of steam in boilers depends on the pressure but whilst it is in contact with the water it never exceeds the boiling point for that pressure. ...
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