Zhangjiagang HuaDong Boiler Co., Ltd.
Zhangjiagang HuaDong Boiler Co., Ltd.
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Carbon Steel Heat Exchanger Superheater And Reheater For CFB Boiler Efficiency
What is the highest efficiency of a boiler?
Electric combi-boilers are technically around 98-100% efficient,whereas gas combi-boilers are typically between 90% and 95% efficient. Nonetheless, gas iunits cost less to use. That's because electricity costs more than gas, and electric units have much higher energy demands.
Description
The Steam Superheater is a coil type heat exchanger which is used to produce superheated steam or to convert the wet steam to dry steam, generated by a boiler. It is different from a boiler in a way that, boiler utilizes both sensible heat as well as latent heat to convert water into steam while superheater utilizes only sensible heat to superheat the steam in order to increase its enthalpy.
Details
Superheating raises overall efficiency as well as avoids too much condensation in last stages of turbine which avoids blade erosion.
The heat of combustion gases from furnace is utilised for removal of moisture from steam and to superheat the steam.
Super-heaters ususlly have several tube circuits in parallel with one or more return bends,connected between headers.
Heat from the hot gases to the vapour in the surperheater is transferred at high temperatures.
Therefore promary section of superheater is arranged in counterflow and secondary section in parallel flow to reduce the temp.stressing of the tube wall.
Principle
Principle of superheater is similar to steam generating tubes of boiler.
The hot gases at high temperature sweep over superheater tubes and raise the temperature of steam which magnitude depends upon exit gas temperature leaving the superheater and gas velocity.
use for heating saturated steam, steam temperature could be up to 900 degree C.
Superheater Capacity Upgrades to Increase Power Generation
Send us required technical data, such as steam capacity, presure, required temperature etc. We will design accordingly.
Function
Superheater is to increase the temperature of the steam above its saturation point.
Reheater is basically a superheater that superheats steam exiting the high-pressure stage of a turbine. The reheated steam is then sent to the low-pressure stage of the turbine. By reheating steam between high-pressure and low-pressure turbine it is possible to increase the electrical efficiency of the power plant cycle beyond 40%.The reheat cycle is used in large power boilers since it is feasible economically only in larger power plants.
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 |
| Inverted-type 1.Proper drainage of the condensed steam 1. Lack the structural rigidity, especially in high speed gas flow Supported from below |
| 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.
Advance technology
| 1 | HDB has extensive experience using their remaining useful life analysis system to predict the lifespan of tubes. |
| 2 | The system measures the oxide and wall thickness of the tube during an on-site non-destructive test and this is used to calculate the remaining useful life. |
| 3 | HDB developed the oxide measuring technology in 1991 and it is now used as the standard throughout the world. |
Details
| 1 | Material composition | Carbon steel, alloy steel or heat-resistant steel, collection boxes and other supporting material. Tubes are customized types of specifications. |
| 2 | Design pattern | Vertical or horizontal layout. |
| 3 | Advantages | Beautiful appearance, size, accuracy, first-class bending and welding technology, first-class detection equipment. |
Product Function
1.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.
2.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.
3.The heat of combustion gases from furnace is utilized for the removal of moisture from steam and to superheat the steam.
4.Super-heaters usually have several tube circuits in parallel with one or more return bends, connected between headers.
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