Xây dựng hệ số phát thải cho quá trình dập cốc phục vụ công tác kiểm kê khí thải = Development of emission factors for quenching process to emissions inventory

Nguyin Thi Thu ThiJy vd Dtg Tgp chi KHOA HOC & CONG NGHE 126(12); 107-111

DEVELOPMENT OF EMISSION FACTORS FOR QUENCHING PROCESS

TO EMISSIONS INVENTORY

Nguyen Thi Thu Thuy*, Nguyen Thi Hanh, Nguyen Thi Thu Phuong

College of Technology - TNU

SUMMARY

At the coking plant, there are many manufacturing processes which generate air pollutants and

impact on the environment, including coke quenching. Inventory of emission of coke production

process make significant contribution to air pollution control and environmental management. In

this studying, concentrations of pollutants being CO, SO2, NO, in coke quenching process were

determined. Samples of gaseous pollutants in the flue were collected using a stack sampler of

APEC XC572-V and following USEPA methods 6, 7, 10. Based on monitoring and the process

information, total emissions and emission factors of these pollutants for this process were

determined. Based on burning fiiel, the emission factors of CO, SO2, and NO2 in the experiment

were 0.029 mg/kg; 0.012 mg/kg; and 0.004 mg/kg, respectively. Alternatively, based on coke

product, the emission factors of CO, SO2, and NO2 in the experiment were 0.035 mg/kg; 0.015

mg/kg; and 0.005 mg/kg, correspondingly. The results obtained from the research can be used for

industrial emission inventories and air quality management in Viet Nam.

KeywordsiAlr polluani, coke quenching, emission, emission fiiclor, inventory

INTRODUCTION

An emission factor is a representative value

that attempts to relate the quantity of a

pollutant released to the atmosphere with an

activity associated with the release of that

pollutant. Emission inventories are

fundamental tools for air quality management.

They are used for identifying major

contributors of atmospheric pollutants,

developing emission control strategies,

determining applicability of permitting

programs, and other related applications [4].

Metallurgical coke is produced by the

destructive distillation of coal in coke ovens

Prepared coal is heated in an oxygen-fi-ee

ahnosphere (-cooked-) at 950-I050°C until

most volatile components in the coal are

removed. The material remaining is a carbon

mass called coke [5]. At the coke plant, there

are many manufacturing processes which

generate air pollutants to impact on the

environment, including coke quenching.

However, data on emission factors for coke

production is scarce includmg Viet Nam. This

' Email: Tkuynguyenktml@tnuudu v.

Study; therefore, aims to develop the

emission factors of coke production in

Vietnamese conditions. This paper presents

preliminary results on the emission factors

of coke quenching process for Thai Nguyen

Iron and Steel Joint Stock Company.

MATERIALS AND METHODS

Process description

This study was conducted at Coking Factory

of Thai Nguyen Iron and Steel Joint Stock

Company. There are three main houses in this

company including coking house, chemistry

house, and steel rolling house,

From raw coal storage, coal is put into bunker

and is pushed to mixing bins and, at which,

the coal is usually a blend of two or more

kinds of coal. Then, it is heated in sealed

chamber without air with the temperature

inside oven reaching from 950''C to 1050°C in

20 minutes. At the end of process, the coke is

pushed through a coke guide into a special

railroad car called a quench car. The quench

car carries the coke to a quench tower where

it is deluged with water to prevent the coke

from burning after exposure to air. When

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