Black Liquor Gasifier/Gas Turbine Cogeneration

Author:

Consonni S.1,Larson E. D.2,Kreutz T. G.2,Berglin N.3

Affiliation:

1. Dipartimento di Energetica, Politecnico di Milano, 20133 Milano, Italy

2. Center for Energy and Environmental Studies, School of Engineering and Applied Science, Princeton University, Princeton, NJ 08544

3. Department of Heat and Power Technology, Chalmers University of Technology, 412 96 Go¨teborg, Sweden

Abstract

The kraft process dominates pulp and paper production worldwide. Black liquor, a mixture of lignin and inorganic chemicals, is generated in this process as fiber is extracted from wood. At most kraft mills today, black liquor is burned in Tomlinson boilers to produce steam for on-site heat and power and to recover the inorganic chemicals for reuse in the process. Globally, the black liquor generation rate is about 85,000 MWfuel (or 0.5 million tonnes of dry solids per day), with nearly 50 percent of this in North America. The majority of presently installed Tomlinson boilers will reach the end of their useful lives during the next 5 to 20 years. As a replacement for Tomlinson-based cogeneration, black liquor-gasifier/gas turbine cogeneration promises higher electrical efficiency, with prospective environmental, safety, and capital cost benefits for kraft mills. Several companies are pursuing commercialization of black liquor gasification for gas turbine applications. This paper presents results of detailed performance modeling of gasifier/gas turbine cogeneration systems using different black liquor gasifiers modeled on proposed commercial designs.

Publisher

ASME International

Subject

Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering

Reference34 articles.

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3. AFPA, 1996, “Fact Sheet on 1994 Energy Use in the U.S. Pulp and Paper Industry,” American Forest & Paper Association, Wash., DC, Mar. 27.

4. Aghamohammadi, B., Mansour, M. N., Durai-Swamy, K., Steedman, W., Rockvam, L.N., Brown, C., and Smith, P., 1995, “Large Scale Pilot Testing of the MTCI/Thermochem Black Liquor Steam Reformer,” Proc. 1995 International Chemical Recovery Conference, TAPPI Press, Atlanta, GA. pp. B297–B301.

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