Experimental Research on Improving Overall Desulfurization Efficiency of CFB Boiler

CFB boiler operating unit part of the furnace desulfurization method, the general is the limestone desulfurization agent into the furnace calcination decomposition to remove fuel combustion process generated SO2? As the furnace desulfurization by the boiler bed temperature? Boiler load? Calcium sulfur ratio? Limestone desulfurizer particle size and limestone desulfurizer reactivity and other factors, the desulfurization efficiency is difficult to guarantee, reducing the desulfurization agent utilization and desulfurization efficiency? At the same time, the use of finer limestone limestone desulfurization agent with the flue gas to the Tail flue, not only a waste of desulfurization agent, increase investment, but also increase the rear dust collector and other equipment burden?

In order to improve the overall desulfurization efficiency of CFB boiler unit and improve the utilization of desulfurizer? Optimize the boiler operating parameters under the premise of ensuring the boiler efficiency, through the particle size of limestone desulfurization agent sorting optimization in order to improve its utilization rate and Furnace desulfurization efficiency, and then by the end of the boiler activation activation of deep desulfurization device, the final flue gas emissions from the furnace to 200mg / Nm3 below the level of the overall desulfurization efficiency of the boiler to meet the new CFB boiler emissions standards for environmental pollutants Provide a guarantee?

1 unit overview

Boiler model SG-1060 / 17.5-M802, is a subcritical parameter? An intermediate reheat? Single drum natural circulation? Balanced ventilation? Circulating fluidized bed boiler, from a single hearth? 4 high temperature adiabatic cyclone? 4 Taiwan U-shaped back feeder? 4 sets of external heat exchanger? Tail convection flue and other components; steam turbine model NZK300-16.7 / 538/538, is a subcritical parameter? ? Direct air-cooled condensing steam turbine; generator model QFSN-300-2, the cooling mode is water - hydrogen - hydrogen type?

The boiler desulfurization system uses the combination of desulfurization furnace and the tail activation of deep desulfurization combined desulfurization method to reduce the content of SO2 in the flue gas?

2 main technical measures

2.1 optimize the quality of limestone into the furnace

Optimize the quality of limestone desulfurization agent is mainly in the limestone finished product warehouse step by step to increase the limestone powder extraction equipment and a secondary extraction device? One of the extraction device is mainly the particle size greater than 0.5mm limestone powder extracted, Machine grinding; secondary extraction device mainly limestone particle size less than 0.2mm separation, and its use in slime ball system to improve the utilization of limestone powder?

After a two-stage extraction device limestone desulfurizer particle size after sorting will be mainly concentrated in the 0.2 ~ 0.5mm, on the one hand so that the desulfurization agent into the furnace more fully burned, on the other hand with flue gas to take the smaller limestone Desulfurizer content decreased, can improve the utilization of desulfurizer in the furnace?

2.2 additional activation activation depth Desulfurization device

The new activation activation depth desulfurization device is the addition of desulfurization lance at the horizontal flue between the air preheater and the bag filter to inject the activation activator to further reduce the SO2 content in the flue gas. Desulfurization tower and other equipment, and easy operation and maintenance?

Activation Depthof desulfurization equipment mainly uses ammonia as a stimulant activator, the use of water and ammonia to reduce the dual role of SO2 in flue gas? On the one hand, water and tail flue gas CaO reaction of raw Ca (OH) 2, Ca (OH ) 2 reacts with SO2 in the flue gas to increase the utilization of CaO in the fly ash and reduce the emission of SO2. On the other hand, ammonia reacts directly with SO2 in the flue gas in the presence of water and oxygen to absorb the SO2 in the flue gas SO2, to further reduce its content?

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