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Address: Address: N0.1, Dongli Road, Donglai, Zhangjiagang City, Jiangsu Province, China
Contact name:Sandy Chen
Zhangjiagang HuaDong Boiler Co., Ltd. |
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Biomass Boiler Super Heater Automatic Bending Line Carbon Steel ASME Material Grade
Carbon steel ASME material grade biomass boiler super-heater automatic bending line
Brief intruction
| Types of Superheater Boiler – Superheater is a subcritical boiler component that serves to heat the saturated steam, at constant working pressure, so it becomes superheated steam. |
| In its development since the beginning of the 20th century, along with various boiler design races, some engineering experts patented the design of different superheater. |
| Here are the types of superheater boiler, according to the patents |
Different types
| 1 | Radiant Superheater |
| 2 | Convective Superheater |
| 3 | Separately Fired Superheater |
Function
| uniform distribution of steam and gas across all the sections to minimize unbalance of flows, optimally high steam velocity in all the tubes to keep the metal temperatures as low as possible, and minimum steam pressure losses. Superheater pressure drop is normally limited to ∼8% of outlet pressure to reduce the pumping load. |
Format
| 1 | The superheater is usually drainable along a single loop of an inverted U |
| 2 | As the required superheat increases or a larger control range is desired, a double inverted U-type superheater may have to be adopted, making the heater nondrainable.As the required superheat increases or a larger control range is desired, a double inverted U-type superheater may have to be adopted, making the heater nondrainable. |
| 3 | The superheater in a package steam boiler is largely convective. |
| 4 | The degree of control range is also not as large as in field-erected steam boilers. |
| 5 | Occasionally, a loop is pushed into the furnace space to achieve higher temperature. |
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.
