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