Dry desulfurization process

Introduction to YNSDS:

The system relies on the principle of dry desulfurization method, integrates the advantages of various flue gas desulfurization processes, integrates the professional technology independently developed by our company, and owns the independent core technology property rights of flue gas desulfurization treatment.

working principle:

Dry desulfurization is to fully mix and contact the superfine powder of desulfurizer (NaHCO3 can be selected as an example) with flue gas, and react with SO2 in flue gas rapidly under the action of catalyst and accelerator. In addition, in the reactor, flue and bag filter, the superfine desulfurizer powder always reacts with SO2 in the flue gas. The reaction is rapid and sufficient, and can produce by-product Na2SO4. The by-products are recycled through cloth bags and used as chemical products. 3. Desulfurization mechanism: main reaction: 2NaHCO3 (s)=Na2CO3 (s)+H2O (g)+CO2 (g) (1) SO2 (g)+Na2CO3 (s)+1/2O2=Na2SO4 (s)+CO2 (g) (2) side reaction: SO3 (g)+Na2CO3 (s)=Na2SO4 (s)+CO2 (g) (3)

Technical advantages:

1) YNSDS process system is simple, easy to operate and maintain, flexible in adjustment, good in controllability, high in automation, and unattended. Low one-time investment, low operation cost, small floor area, avoiding white smoke, reliable and durable equipment, low failure rate, and long service life. 2) YNSDS has high technical efficiency, which can easily meet the current special emission limit requirements, and can also achieve more stringent ultra-low emission requirements in the future (SO2 ≤ 35mg/Nm3).

2) The YNSDS system operates in a dry state, with no wastewater treatment and discharge problems, no wet tailing and dust wet flue gas discharge problems, and no secondary pollution.

3) The YNSDS system basically does not produce temperature drop and can be directly discharged from the original chimney (no anti-corrosion).

4) The amount of desulfurizer used in YNSDS system is small, and the amount of by-products is small, which can be recycled.

5) YNSDS system adopts the process of desulfurization before denitration to reduce the impact of SO2 concentration in flue gas on the life of medium and low temperature SCR denitration catalyst. After desulfurization, flue gas directly enters the bag filter to remove tar in flue gas while dedusting, which effectively prevents tar from blocking the catalyst and ensures stable operation of the system.

6) YNSDS system sets an additional baking soda superfine powder injection point in the flue in front of the air preheater at the outlet of the economizer. When the boiler is in high load operation, the exhaust gas temperature is high, which can meet the desulfurization reaction temperature requirements, and the injection point at the reactor is started; In case of low load operation, start the injection point in front of the air preheater at the outlet of the economizer to ensure that SO2 can be discharged up to standard under low load operation.