The Best Desulfurization Technology For Power Plant In Coastal Area
Beijing
Longyuan has supplied capacity covering design, manufacturing, erection,
configuring and technical service, meanwhile we also have FGD Technology with completely
independent intellectual property right. Based on 15 years’ seawater FGD
experience, we are able to provide high standard, high environmental-friendly,
high efficiency complete solution of seawater FGD to overseas and domestic
customers in different area with different sulfur concentration. Now we have
taken near 90% domestic seawater FGD market share and near 30% of international
share. As one international advanced environmental protection company who can
provide global service, so far our main customers are located in Chinese
mainland, Southeast Asia and Central Asia.
Process Principle
The
seawater FGD process utilizes seawater’ s inherent properties to absorb and
neutralize the sulphur dioxide in the flue gas.
The most important feature of this technology is that it need no other absorbent
without seawater, and will not produce by-product and second pollution, therefore it is totally harmless to ocean and atmospheric environment。At the same time, it has
advantages in many aspects, including simple system, low operation cost, high
removal efficiency (over 95%, even over 99%). Since its standard of discharge
water can meet national seawater quality standard and other related national
water quality standard. It will not make bad effect on surrounding waters, that
makes seawater FGD become the best FGD solution for power plant in coastal
area.
Process Flow Diagram
Using
circulation cooling water of power unit for FGD
The chemical reaction of SO2 in flue gas with seawater:
SO2＋H2O→H2 SO3
H2SO3→H＋＋HSO3－
HSO3－→H＋＋SO32－
SO23－＋1/2O2→SO42－
The chemical reaction between
hydrogen ion produced above and carbonate in seawater:
CO32－＋H＋→HCO3－
HCO3－＋H＋→H2CO3→CO2＋H2O
The
seawater that washed flue gas show acid，and has a lot of SO32-（Sulphite ion）, so cannot be discharged into
sea directly. The waster discharged from absorber tower will be sent to seawater
treatment plant, after mixed with cooling water from cooling circulation system，will be blow into large quantity of air in order to make SO32- into SO42-and expel CO2 in the seawater. The pH
value and COD index of the treated seawater need to reach the emission standard,
then the threated seawater can be discharged into sea. And the treated flue gas
will be discharged into air through the stack.
Major Features and Strengths
Technology
Mature
technology， simple
process, high removal efficiency, low equipment cost.
Economy
Only use circulation
cooling water as absorbent, no need other additives，which help to save a lot of
cost and no need to prepare limestone’s mining，processing,
transporting and storing.
Environmental
Protection
The process
water treated by FGD system and reach the local coastal area emission standard,
can be discharged into sea. There is no by-product and waste in the process. Thus,
dispose of waste and secondary pollution would be avoided.
Reliability
No scale
and blockage，and
high system utility rate
O&M
lower
operation and maintenance cost compared with limestone-gypsum FGD technology.
Main Performance:
SO2 Removal Efficiency：＞95% ；
Plant Power Consumption: 0.5%-1%
System Reliability：≥98%
Aeration Basin
CN
EN
