Publicação
CASE STUDY: DEDUSTING SYSTEM FROM LIME KILN EXHAUSTING GASES IN A PULP AND PAPER INDUSTRY USING A FLOODED DISK VENTURI SCRUBBER

 Authors: Marcos Coloniezi Oliveira1 , Philippe Lemes Bittencourt1 , Guilherme Reis Fressato1 , Kjell Olof Eriksson2 1 Tequaly, Brazil 2 Tequaly, Sweden

O PAPEL vol. 83, N.o 3, pp. 67 - 71 - MAR 2022

ABSTRACT This article presents a technical solution to reduce dust emissions from lime kiln exhausting gases in a pulp and paper industry, aiming to decrease environmental impacts. These emissions are regulated at the federal level by Brazil’s National Environmental Council (CONAMA), through Resolution 436 of 2011, and by state environmental entities, for which said emissions must not exceed 180mg/scm. In the cases studied, the amount of flue gas particulate material emitted from the lime kiln after primary treatment was 700mg/scm, well above the value permitted by law. Several technologies relate equipment and systems to the solid-gas separation processes in the gaseous emission sources. Each one of them has its own advantages and applications. In analyzing different dedusting mechanisms, the main and most common unit operations are the electrostatic precipitator and the Venturi scrubber. In this context, the flooded disk Venturi scrubber was the option chosen for the solid-gas separation process, given its implementation costs, dedusting efficiency and operability of the system. This solution Corresponding author: Marcos Coloniezi Oliveira. Tequaly. Rua Francisco Sobania, 1300. Curitiba – PR – Brazil - 81460-130 Phone: +55 41 99917 5810. E-mail: marcos.coloniezi@tequaly.com.br was assembled in 2 lime kilns at the same pulp mill (1040 ADTPD, air-dried ton per day), where the maximum dry basis concentration obtained was 59.49 (lime kiln A) and 31.04 (lime kiln B) mg/scm at 8% O2 . These results show that the system chosen is an effective solution, staying at least 66% below the limit of CONAMA Resolution 436/11. Keywords: Gaseous emissions, lime kiln, pulp and paper, venturi scrubber, environmental legislation.

Corresponding author: Marcos Coloniezi Oliveira. Tequaly. Rua Francisco Sobania, 1300. Curitiba – PR – Brazil - 81460-130 Phone: +55 41 99917 5810. E-mail: marcos.coloniezi@tequaly.com.br 
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