Regeneration method of CaO/Al2O3 desulfurizing agent

Abstract

The regeneration method of CuO / Al2O3 desulfurizer is that the CuO / gamma-Al2O3 desulfurizer for absorbing sulfur can be reduced and regenerated in the atmosphere containing ammonia gas, its regeneration temp. is 350-500 deg.C, space velocity is 500-3000 hr (-1) and regeneration time is 30-90 min. Its regeneration process is simple, its secondary desulfurizing activity is stable, the SO2 produced in the course of regeneration can be combined with unreacted NH3 under the condition of low temp. to form solid ammonium sulfate salt.

Description

Technical field: [0001] The invention belongs to a regeneration method of a desulfurizing agent, in particular to a CuO / Al 2 O 3 Regeneration method of desulfurizer Background technique: [0002] At present, environmental protection has become the most concerned issue of human beings. Air pollution, especially SO due to the use of fossil fuels x And the resulting acid rain seriously endangers human health, destroys the ecosystem, and restricts the sustainable development of society and economy. Therefore, how to control coal-fired SO cost-effectively x The emission of energy is a key problem that needs to be solved urgently in the fields of energy and environmental protection in our country and even in the world. Currently, flue gas desulfurization (FGD) is considered to control SO 2 One of the most efficient ways to discharge emissions. Existing flue gas desulfurization technologies can be roughly divided into two categories: wet and dry. Wet desulfurization technol...

AI Technical Summary

Problems solved by technology

At present, the widely used H at home and abroad 2 、CH 4 Although regenerants such as sulfided CuO / Al can be achieved 2 o 3 Reductive regeneration, but there are still deficiencies: (1) According to Chem.Eng.Prog.67 (1971) 86 and Appl.Catal.B: Environ.1 (1992) 13 reports, H 2 It has very strong reducibility, although CuSO can be desulfurized in the temperature window (300°C-400°C) 4 Reduction to elemental copper and sulfur dioxide gas, but also CuS and (or) Cu 2 Sulfides such as S (about 33%) remain on the surface of the catalyst and occupy the active sites of copper, thereby reducing the subsequent desulfurization efficiency; (2) Relatively speaking, CH 4 Reducibility is better than that of H 2 Much weaker, according to Ind.Eng.Chem.Res., 37 (1998) 2611 report, its effective reduction temperature must be higher than 450 ° C, and the reduction rate is slow, it is difficult to match the desulfurization temperature to achieve the same temperature regeneration; (3) regeneration The gaseous product SO produced in the process 2 Difficult to store and needs to be concentrated or further processed to H 2 SO 4 Or S, the process is complex, especially for decentralized boilers, it is difficult to apply