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Mercury removal from cement kiln flue gas by sorbent injection

Mercury removal from cement kiln flue gas by sorbent injection. Project 6 of New Cement Production Technology Platform Yuanjing Zheng Industrial PhD student, FLSmidth Airtech Supervisors Anker Degn Jensen CHEC, DTU Christian Windelin Flemming Jensen FLSmidth Airtech. Introduction.

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Mercury removal from cement kiln flue gas by sorbent injection

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  1. Mercury removal from cement kiln flue gas by sorbent injection Project 6 of New Cement Production Technology Platform Yuanjing Zheng Industrial PhD student, FLSmidth Airtech Supervisors Anker Degn Jensen CHEC, DTU Christian Windelin Flemming Jensen FLSmidth Airtech

  2. Introduction • News about mercury rule: On 8th August 2010, US. EPA set the nation’s first limits on mercury air emissions from existing cement kilns and strengthened the limits for new kilns. • When fully implemented in 2013, 92% reduction of mercury emission is required • Mercury emission limits: 4 µg/Nm3 (new kiln), 10 µg/Nm3 (existing kiln) Sketch of the mercury removal process by sorbent injection upstream of a fabric filter.

  3. Fixed-bed reactor for sorbent study Sorbent loading Mercury vapor generator Glass converter with red brass Red brass chips (left) Sulfite compounds (right)

  4. Sulfite converter for oxidized mercury reduction Total and elemental mercury profile of 30 mg Darco Hg tested at 150C in simulated kiln gas. Dynamic test of 20 g sulfite compounds at 500ºC with 10 ppmv HCl in flue gas. Optimum temp. is 500℃ and should be kept dry when not used; HCl is a key factor, ≤ 10 ppmv; Good heating after converter; Avoid leakage

  5. Sorbents screening Screening tests of 2 g raw meal at 75C using simulated kiln gas No mercury adsorption on 30 mg sorbents, 75 and 150C for Minsorb 1,3, DM, ME, clay, cement, Saklei fly ash, hydrated lime, kiln dust, kaolin. Screening tests of 30 mg sorbents in 2 g inert sand at 150C using simulated kiln gas

  6. Isothermal study of Darco Hg carbon 150C 120C

  7. Parametric study of Darco Hg carbon Effects of sorbent load at 150C Effects of HOK carbon particle size, 30 mg sorbent at 150C

  8. Simulation of fixed-bed adsorption Fixed-bed adsorption model t=0, C=0, Cbin,i=Cb,i=Cb0, t>0 first tank Cbin,1= Cb0, other tanks Cbin,i= Cb,i-1 Simulation mercury adsorption by 30 mg Darco Hg in simulated kiln flue gas at 150C using derived Henry’s constant from experiments.

  9. Tak for opmærksomheden/ Thanks for the Attention ! Contact: yjz@kt.dtu.dk

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