Recovery and Purification of Gas Emissions from Pulp Production. C. 182-194

Complete text of the article:

Download article (pdf, 0.7MB )

UDС

66.021.3.001.57:532.529

DOI:

10.37482/0536-1036-2024-1-182-194

Abstract

For pulp production, large-scale enterprises have been built which, while in operation, are subject to new requirements, different from the design ones, for economic efficiency, labour safety, as well as impact on the local population and the environment. Significant success in this work has been achieved by changing the liquor recovery technology, switching to burning black liquor of increased concentration, which makes it possible to almost completely eliminate the largest source of hydrogen sulfide and methyl mercaptan emissions with flue gases, reduce sulfur losses and improve energy efficiency of soda recovery boilers. Another significant source of soda recovery boiler emissions is a smelt dissolving tank vent. An important technological operation of dissolving molten sodium salts with weak white liquor supplied from the causticization shop takes place in the tank. The modern development of smelt leaching technology is related to the improvement of equipment compatible with the technology of regeneration of chemical reagents for pulp production. Heat exchangers and gas purifiers of “gas-liquid” systems, easier to adapt to technological requirements compared to other systems, are installed on the dissolving tank vent. The installation of such equipment provides the change in the smelt leaching technology, and affects the technology of causticization and lime recovery. This article covers the research of the relationship between the technical solutions ensuring the safety of personnel in the boiler shop, heat and chemicals recovery, as well as purification of gas emissions and the changes in the technology of smelt leaching in the soda recovery boiler of the pulp mill. On the basis of experimental data and a mathematical model of the movement of the vapour-gas mixture in the smelt dissolving tank vent, the technological feasibility of installing heat exchangers at different heights of the vent and the possibility of effective purification of gas emissions using a direct-flow sprayer have been considered. The applicability of the irrigation of the steam-gas flow with weak white liquor, which is formed during the cycle of chemical regeneration in pulp production, as well as the conditions for ensuring reliable operation of gas purification equipment, have been investigated. The quantitative characteristics of the necessary change in consumption and composition of weak white liquor and the methods of its supply to the dissolving tank have been obtained.

Authors

Sergey V. Aniskin*, Doctor of Engineering, Prof.;
ORCID: https://orcid.org/0000-0001-8819-381X
Victor S. Kurov, Doctor of Engineering, Prof.; ResearcherID: V-7289-2017,
ORCID: https://orcid.org/0000-0002-7168-9613

Affiliation

Saint-Petersburg State University of Industrial Technologies and Design, ul. Ivana Chernykh, 4, Saint Petersburg, 198095, Russian Federation; asv-47@mail.ru*, vskurov18@mail.ru

Keywords

melt, solution, weak white liquor, dust, hydrogen sulfide, regeneration, recuperation, condensate, purification, air, vapour

For citation

Aniskin S.V., Kurov V.S. Recovery and Purification of Gas Emissions from Pulp Production. Lesnoy Zhurnal = Russian Forestry Journal, 2024, no. 1, pp. 182–194. (In Russ.). https://doi.org/10.37482/0536-1036-2024-1-182-194

References

1. Aniskin S.V., Kurov V.S. Development of High–Reliability Direct-Flow Spray Devices Compatible with Pulp and Paper Production Technology. Vestnik of St. Petersburg State University of Technology and Design. Series 4: Industrial Technologies, 2022, no. 1, pp. 90–94. (In Russ.). https://doi.org/10.46418/2619-0729_2022_1_13
2. Barkalov B.V., Pavlov N.N., Amirdzhanov S.S., Grimitlin M.I., Moor L.F., Pozin G.M., Kreymer B.N., Rubchinskiy V.M., Sadovskaya T.I., Berezina N.I., Bychkova L.A., Ushomirskaya A.I., Finkel’ntein S.M., Pirumov A.I. Internal Sanitary Equipment: in 3 Parts. Part 3.Ventilation and Air Conditioning. Book 2. Edited by N.N. Pavlov and Yu.I. Shiller. 4th ed., revised and enlarged. Moscow, Stroyizdat Publ., 1992. 416 p. (In Russ.).
3. Ivanov A.N., Belousov V.N., Smorodin S.N. Heat Exchange Equipment for Industrial Enterprises. St. Petersburg, 2016. 184 p. (In Russ.).
4. Kochev A.G., Sergienko A.S. Aerodynamic Calculation of Mechanical and Gravitational Ventilation Systems. Nizhny Novgorod, Nizhny Novgorod State University of Architecture and Civil Engineering, Delovaya Poligraphiya Publ., 2015. 25 p. (In Russ.).
5. Nepenin Yu.N. Cellulose Technology: in 3 vol. Vol. II: Production of Sulphate Cellulose. Moscow, Lesnaya promyshlennost’ Publ., 1990. 600 p. (In Russ.).
6. Pasechnik S.P., Torf A.I. Gas Cleaning Units for Smelt Dissolving Tanks in Soda Recovery Boilers. Moscow, VNIPIEIlesprom Publ., 1977. 30 p. (In Russ.).
7. Romanova L.V., Stasyuk E.A., Rodionov V.G., Gogonin I.I. A Device for the Regeneration of Heat and Chemicals from Steam-Gas Emissions of a Smelt Dissolving Tank in a Soda Recovery Boiler. Patent RF, no. RU 2043444 BI, 1995. (In Russ.).
8. Sivakov V.P., Vurasko A.V., Muzykantova V.I. Regeneration of Chemicals and Heat in Soda Recovery Boilers. Device and Diagnostics. Yekaterinburg, Ural State Forestry University, 2015. 141 p. (In Russ.).
9. Smorodin S.N., Ivanov A.N., Belousov V.N. Soda Recovery Boilers. St. Petersburg, 2010. 164 p. (In Russ.).
10. Technology of Pulp and Paper Production. In 3 volumes. Volume 1. Production of Semi-Finished Products. Part 2. Production of Semi-Finished Products. St. Petersburg, Politekhnika Publ., 2003. 663 p. (In Russ.).
11. Ahtila P., Ruohola T., Tamminen A. Method and Apparatus for Preparing Green Liquor. Patent no. Europäisches patentament EP 1 193 341 B1. 2005.
12. Das S.K., Biswas M.N. Studies on Ejector-Venturi Fume Scrubber. Chemical Engineering Journal, 2006, vol. 119, iss. 2–3, pp. 153–160. https://doi.org/10.1016/j.cej.2006.03.019
13. Directive 2008/50/EC of the European Parliament and of the Council of 21 May 2008 on Ambient Air Quality and Cleaner Air for Europe. Official Journal of the European Union, L 152, 11.06.2008, pp.1–44.
14. Gamisans X., Sarra M., Lafuente F.J., Azzopardi B.J. The Hydrodynamics of Ejector-Venturi Scrubbers and Their Modelling by an Annular Flow/Boundary Layer Model. Chemical Engineering Science, 2002, vol. 57, iss. 14, pp. 2707–2718. https://doi.org/10.1016/S0009-2509(02)00171-9
15. Harry-Ngei N., Ubong I., Ede P.N. A Review of the Scrubber as a Tool for the Control of Flue Gas Emissions in a Combustion System. European Journal of Engineering and Technology Research, 2019, vol. 4, iss. 11, рр. 1–4. https://doi.org/10.24018/ejeng.2019.4.11.1561
16. Poling B.E., Prausnitz J.M., O’Connell J.P. The Properties of Gases and Liquids. New York, McGRAW-HILL, 2001. 803 p.
17. Sittig M. Pulp and Paper Manufacture: Energy Conservation and Pollution Prevention (Pollution Technology Preview). Park Ridge, NJ, Noyes Data Corp. / Noyes Publ., 1977. 430 p.
18. Smook G.A. Handbook for Pulp and Paper Technologists. TAPPI Press, 2016. 438 p.