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  Wet limestone gypsum FGD Technology
 
  Flowchart of limestone gypsum flue gas desulphurization technology
 
  Process characteristics:
 
  The process is simple,the technology is advanced and reliable.It is the most widely used desulphurization technology at home and abroad.
 
  The absorber is sprinkled by empty tower,with multi-layer spray layer,advanced and reliable nozzles and oxidizing air pipes.
 
  The range of flue gas treated by process is wide,and the smoke from 200MW to 600MW units can be effectively treated.
 
  The fuel containing sulfur has a strong adaptability and can meet the stable operation of the unit within the 30%-110%load range,and it is especially suitable for high sulfur coal and low SO2 emission in key areas.
 
  The efficiency of desulphurization is generally greater than 90%,and the maximum is up to 99%.
 
  The unique airflow homogenizing device makes the distribution of smoke in the absorption tower uniform,and strengthens the turbulence level of the flue gas and washing liquid,and improves the desulfurization efficiency.
 
  This process is advanced in economic and technical indicators.When limestone is used as desulfurizer,the liquid gas ratio is 10~12L/m3,the energy consumption of desulfurization system is low,and the utilization ratio of absorbent is high:calcium sulfur ratio 1.02~1.03.
 
  The tower bottom tank desulphurization liquid feeding device has multiple outlets uniformly distributed suspension nozzle,and the bottom tank of large diameter absorber does not produce precipitation phenomenon.
 
  The internal anticorrosive material of the absorber is corrosion resistant,wear-resistant and durable.
 
  The flue gas desulfurization system is fully automated.
 
  The process system consists of:
 
  SO2 absorption system of smoke system,absorbent system,gypsum dehydration and storage and transportation system,wastewater treatment system,process water system,compressed air and steam system,electric control system,slurry discharge system
 
  Scope of application:
 
  Medium and large new or revamping projects
 
  The sulfur content of coal is 0.5%-5%,up to 8%
 
  Desulfurization efficiency is more than 95%
 
  Rich limestone resources and extensive utilization of gypsum.
 
  Two alkali method for flue gas desulfurization
 
  Technical flowchart of sodium calcium double alkali method for flue gas desulfurization
 
  Process characteristics:
 
  1.The technology is mature and the operation is stable and reliable.The main equipment and installation failure rate is low,so it will not affect the safe operation of the boiler due to the desulphurization equipment failure.
 
  2.The process is advanced and the operating cost is low.Because of the very high activity of natrium,the high efficiency of desulfurization can be achieved by using only a low ratio of liquid to gas,and the cost of operation is greatly reduced because of the reuse of cheap calcium and alkali and sodium alkali.
 
  3.The investment of the project is few and the economic benefit is high.The project investment of sodium calcium double alkali method is only 2/3~3/4 of other wet technology,and the desulfurization efficiency also reaches 90%~95%.The SO2 and dust emission after desulphurization fully meet the environmental protection requirements.
 
  4,it has strong adaptability to the change of coal.The sodium alkali solution is used as a desulfurizer.The absorption effect of the process is good and the utilization rate of the absorbent is high.According to the change of the coal type of the boiler,the pH value,the liquid gas ratio and other factors are properly adjusted to ensure the realization of the design desulphurization rate.
 
  5.The integration of desulfurization and dust removal.Through spray,absorption,adsorption,regeneration and other physical and chemical processes,as well as dehydration and mist removal,the purpose of desulfurization,dedusting,dehumidification and purification of flue gas can be achieved.
 
  6,energy saving,water saving and saving desulfurizer are effective.The double alkali method has the characteristics of high desulphurization efficiency,high availability,high reliability,low investment cost,low operating cost and small land occupation.
 
  7,with NaOH(Na2CO3)desulphurization,the main desulfurization solution is NaOH(Na2CO3)water solution.The water pump,pipe and equipment are not corroded,washed and blocked in the process of circulation,so it is easy to operate and maintain the equipment.
 
  8,the sodium based absorption solution has a fast reaction rate to SO2,so there is a small ratio of liquid to gas to higher desulfurization efficiency.The unique design of the tower has increased the contact area and contact time of the desulfuration liquid with the flue gas,thus increasing the desulfurization efficiency,which is generally more than 95%.
 
  9,the regeneration and desulphurization and sedimentation of desulfurizer all occur outside the tower,avoiding clogging and abrasion in the tower,improving the reliability of operation and reducing the running cost.
 
  10.The air tower spray is used as the desulfurization tower structure.The tower has small resistance,high operational reliability and low accident rate.
 
  11,calcium based replacement,sodium based regeneration cycle,can improve the utilization rate of lime.Sodium hydroxide was used as a reaction agent.The actual consumption was calcium alkali,sodium alkali recycling,and sodium alkali consumption less than 1%.
 
  The process system consists of:
 
  Flue gas system to SO2 absorption system,absorbent preparation and supply system,gypsum dewatering system,process water system,and electric control system.
 
  Scope of application:
 
  Wide range of application,suitable for low,medium and high sulfur coal smoke.
 
  It is especially suitable for flue gas desulfurization technology of small and medium-sized boilers and has wide market prospects.
 
  Ammonia flue gas desulfurization technology
 
  Ammonia desulphurization is the use of liquid ammonia or ammonia to remove SO2 from flue gas and produce by-product ammonium sulfate.
 
  Technological process diagram of ammonia flue gas desulfurization
 
  Process characteristics:
 
  There are no two wastes,waste water and exhaust gas pollution.
 
  The desulfurization efficiency is more than 95%,and the water mist is less than 75mg/Nm3
 
  The absorbents have high utilization rate,and the desulphurization tower is not easy to scale.
 
  Ammonia method has strong adaptability to sulfur content in coal,and is especially suitable for flue gas desulfurization with high sulfur coal.
 
  Turning waste into treasure,desulphurization by-product is ammonium sulphate fertilizer,maximizing the value of SO2 recovery,and the market potential of ammonium sulfate fertilizer is huge.
 
  The system has low running cost,short process,convenient and reliable operation and low energy consumption.It is only 50%of limestone gypsum method.
 
  The process system consists of:
 
  Desulphurization washing system,flue gas system,ammonia storage and transportation system,ammonium sulfate production system,process water system,compressed air system,electric control system.
 
  Scope of application:
 
  Ammonia desulphurization has strong adaptability to sulfur content in coal,and low,medium and high sulfur content of coal can be adapted to desulfurization.
 
  It is especially suitable for desulfurization of medium high sulfur coal.The higher sulfur content in coal,the greater the yield of ammonium sulphate and the higher the economy.
 
  Suitable for large and medium-sized newly-built or retrofitted units
 
  The desulfurization efficiency is more than 95%
 
  Suitable for coal chemical and petrochemical enterprises
 
  Magnesium method for flue gas desulfurization
 
  Process characteristics:
 
  1.Technology maturity
 
  2.Sufficient source of raw materials
 
  3,desulfurization efficiency is high,desulfurization efficiency can reach more than 95%.
 
  4,less investment cost,compared with calcium desulphurization,the investment cost of the same desulfurization system can be reduced by more than 50%.
 
  5.The operation cost is low.The removal of the same SO2 Magnesium Oxide is 40%of the calcium carbonate and the liquid gas ratio is less than 5L/m3.
 
  6,reliable operation,no scaling and clogging of equipment will ensure the safe and effective operation of the whole desulfurization system and no two pollution.
 
  7,comprehensive efficiency is high,the by-product utilization prospect is broad.
 
  System composition:
 
  Flue gas system,SO2 absorption system,desulfurizer slurry preparation system,by-product treatment system,accident slurry system,process water system
 
  Scope of application:
 
  It is suitable for large and medium-sized construction or renovation projects,and can handle large volume of flue gas.
 
  Widely used in the power industry,metallurgical sintering machine flue gas,industrial boilers,paper mills and other desulfurization projects.
 
  Selective Catalytic Reduction
 
  1.Selective catalytic reduction and Denitrification Technology(SCR)
 
  The selective catalytic reduction(SCR)denitrification technology means that under the action of the catalyst,the reductant(liquid ammonia)reacts with the nitrogen oxide in the flue gas to produce harmless nitrogen and water,thus removing the NOx in the flue gas.Selectivity refers to reduction reaction of NH3 and NOx in flue gas instead of oxygen in flue gas.
 
  Process flow chart of selective catalytic reduction and denitrification(SCR)process
 
  Process characteristics:
 
  The efficiency of denitrification is high,up to 85%-90%
 
  The denitration device runs stably and reliably,and the utilization rate of the equipment is high.
 
  The catalyst has long service life and can be used for 24000 hours.
 
  The escape rate of NH3 is less than 5ppm
 
  The SCR reaction device is arranged after the boiler economizer does not affect the structure and performance of the boiler.
 
  System composition:
 
  SCR reactor/catalyst system>flue gas system ammonia storage preparation supply system>ammonia injection system>ammonia/air mixture system>soot blowing system>SCR control system
 
  Two,selective non catalytic reduction denitration technology(SNCR)
 
  SNCR is injected into the furnace with NH3,urea and other reducing agents to selectively react with NOx without catalyst.The reductant is injected into the area of the furnace temperature of 850~1050 C.The reducing agent(ammonia or urea)is rapidly decomposed into NH3 and reacts with the NOx in the flue gas to produce N2,which is a reactor with the furnace chamber.
 
  Flow chart of selective non catalytic reduction denitration(SNCR)process
 
  Process characteristics:
 
  The utility model has the advantages of small space occupation,no need for additional reactors,and the use of a boiler furnace as a reactor,with a reaction temperature of 850~1050 degrees.
 
  The denitrification efficiency can reach 40~70%.
 
  Without catalyst,no oxidation of SO2/SO3 will be produced,which will not cause blockage or corrosion of air preheater.
 
  NH3 escape from 5 to 10ppm;
 
  There is no new pressure loss in the smoke system.
 
  The fuel can be changed at will and will not affect the denitration efficiency.
 
  The operation cost is low,and the technology of SNCR denitration is economical when the current boiler's denitrification efficiency is low.
 
  SNCR is suitable for the transformation of old power plants.It is an economical and practical denitration technology.It is suitable for China's national conditions.
 
  System composition:
 
  The storage system,the reducing agent dilution metering system,the reducing agent distribution system,the reducing agent injection system,the compressed air system,the process water system,the electrical control system,and the control system of the ammonia solution preparation and storage system,the reducing agent dilution metering system,the reducing agent system,the compressed air system,the process water system and the electrical control system

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