Electron beam technology for multi-pollutant emissions control at a coal-fired boiler, current issues

• Autorzy: Licki J. , Chmielewski A.G. , Pawelec A. , Zimek Z. , Bigos A.
• Języki publikacji: EN

Abstrakty

EN

This review describes current issues concerning electron beam technology for the purification of flue gas from a coal-fired boiler. Fundamental studies of this technology were performed in a pilot plant at Kaweczyn Thermal Power Station. It is a dry scrubbing process ensuring the simultaneous removal of SO2 and NOx with high removal effciency in one step and the generation of a usable byproduct. NOx removal is performed by a radiation-induced process and its effciency depends mainly on absorbed dose and inlet NOx concentration. Higher gas temperature and multistage flue gas irradiation enhance NOx removal. The synergistic effect of high SO2 concentration on NOx removal was observed. The SO2 removal is based on two pathways: a thermal process (reaction of SO2 with ammonia in a moist environment) and a radiation-induced process. Its effciency depends mainly on ammonia stoichiometry and irradiated gas temperature and humidity. SO2 removal increases sharply as the irradiation dose increases to 8 kGy and then saturation is reached. The byproduct obtained can be used as an agricultural fertilizer or as a component for producing commercial NPK fertilizer. This technology has been already implemented on a full industrial scale at ”Pomorzany” EPS. This installation purifies up to 270,000 Nm3/h of flue gas from two coal-fired Benson boilers. The highest SO2 removal effciency obtained reaches 95% while for NOx it reaches 75%. Two-stage, longitudinal irradiation of flue gas enhances NOx removal effciency and reduces energy consumption in the process. During pilot plant operation it was proved that electron beam technology can remove SO2 and NOx simultaneously in a wide concentration range of SO2 (250...3,000 ppmv) and NOx (140...280 ppmv) with high effciency. New industrial implementations of this technology have been introduced in China and Bulgaria. This technology is designed for existing plants as a retrofit application as well as for new facilities.

Słowa kluczowe

EN

coal-fired boiler; flue gas; electron beam; SO2 removal; NOx removal

PL

kocioł węglowy; spaliny; wiązka elektronów; usuwanie SO2; usuwanie NOx

• Wydawca: Institute of Heat Engineering, Warsaw University of Technology
• Czasopismo: Journal of Power Technologies
• Rocznik: 2013
• Tom: Vol. 93, nr 5
• Strony: 330--339
• Opis fizyczny: Bibliogr. 7 poz., tab, rys., wykr.

Twórcy

autor

Licki J.

• National Centre for Nuclear Research, Otwock-Świerk, Poland

autor

Chmielewski A.G.

• Institute of Nuclear Chemistry and Technology, Warsaw, Poland ; Warsaw University of Technology, Warsaw, Poland

autor

Pawelec A.

• Institute of Nuclear Chemistry and Technology, Warsaw, Poland

autor

Zimek Z.

• Institute of Nuclear Chemistry and Technology, Warsaw, Poland

autor

Bigos A.

• National Centre for Nuclear Research, Otwock-Świerk, Poland

Bibliografia

• [1] A. Błaszczuk, W. Nowak, S. Jagodzik, Effects of operating conditions on denox system effciency in supercritical circulating fluidized bed boiler, Journal of Power Technologies 93 (1) (2013) 1–8.
• [2] J. Cwiek, J. Labanowski, M. Sozanska, S. Topolska, Resistance of selected protection coatings to hot corrosion in low-emission coal-fired boilers, Rynek Energii 105 (2) (2013) 61–64.
• [3] N. Frank, Introduction and historical review of electron beam processing for environmental pollution control, Radiat. Phys. Chem. 45 (6) (1995) 989–1002.
• [4] J. Licki, Analytical methods and monitoring system for e-beam flue gas treatment process, Radiat. Phys. Chem. 52 (1-6) (1998) 351–354.
• [5] H. Namba, Pilot-scale test for electron beam purification of flue gas from coal-combustion boiler, Radiat. Phys. Chem. 46 (4-6) (1995) 1103–1106.
• [6] A. Chmielewski, Operational experience of the industrial plant for electron beam flue gas treatment, Radiat. Phys. Chem. 71 (1-2) (2004) 439–442.
• [7] A. Chmielewski, Optimization of energy consumption for nox removal in multistage gas irradiation process, Radiat. Phys. Chem. 45 (6) (1995) 1077–1079