How to ensure the steam quality of steam boilers
Steam boilersare much more widely used than hot water boilers. Hot water boilers are mainly used for heating and providing hot water supply, while steam boilers cover all industries such as industrial and power generation. What are the requirements for boiler boilers for boiler boilers? Undoubtedly safe, stable, efficient, long service life, cost saving, etc., however, these requirements are indirectly or directly related to steam quality. The quality of steam is critical because it affects the stability, reliability and economy of the system, as well as product quality, production power and energy consumption. If the steam boiler user does not pay attention to this, it will definitely lead to a series of follow-up problems for the boiler.
1) Cleanliness
There are rust and carbonate deposits in the steam pipeline, and there may be slag and sealing material fragments remaining in the equipment. These impurities may cause jamming and damage to the valves and equipment, and also increase the wear of the pipeline.
The way to improve cleanliness is to install a pipe filter, and the filter should be horizontal.
2) Dryness
Incorrect water treatment of boiler hydration, unreasonable boiler level control, and short-term high peak load and other factors will cause the boiler to co-exit the boiler, so that the boiler outlet carries boiler water. When steam is moving in the pipeline, heat dissipation from the pipeline condenses a portion of the steam, adding condensate from the pipeline.
The chemical substances and other impurities carried in the condensed water will accumulate on the surface of the heat exchange equipment, affecting the power of the heat exchange equipment, and the accumulated impurities will be scarred in the metal appearance of the equipment, resulting in uneven heating of the metal surface and shortened life. In addition, the presence of moisture in the vapor reduces the transpiration of the steam, adding steam consumption; the moisture in the steam increases the thickness of the water film measured by the heat of the heat transfer, and the rated heat transfer resistance occurs.
The addition of a steam separator is a useful way to improve steam dryness, and a highly efficient steam separator can increase steam dryness to 98%.
3) Purity
There is air in the steam system because the steam that is generated by the boiler still inevitably contains a small amount of air, and there are also air when the pipes and equipment are started. When the system and equipment are shut down, the air is taken in due to the internal vacuum.
The air has a very low thermal conductivity and is a poor conductor for heating. The inclusion of air in the steam system will reduce the production capacity of the steam equipment and will also increase the corrosion of pipes, valves and equipment.
The most useful way to eliminate non-condensable gases such as air in a steam system and thereby improve the purity of the steam is to install an automatic air discharge device in the system.
4) Pressure/temperature stability
In order to ensure process heating requirements, the steam pressure at the steam point should reach the demand value. Together, the steam pressure should not be too high, otherwise steam consumption will be added.
When the steam contains non-condensable gas such as air, although the pressure gauge shows satisfactory pressure, the corresponding temperature will be lower than the corresponding full temperature.
High-pressure steam supply, low-pressure steam. Supply the lowest and safe pressure to the steam equipment. This will not only satisfy the production demand, but also achieve the effect of energy saving.
Selecting the appropriate steam delivery pressure and pipe diameter, useful pipe and valve insulation, plus reasonable pipe drainage and emptying, coupled with the use of point decompression and voltage regulation, can achieve the pressure / temperature stability of the steam point.
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