충북지역 중·소규모 사업장의 국소배기장치 설치 실태와 문제점 및 개선방안

Abstract

The purposes of this study were to evaluate exhaust ventilation systems at small and medium-sized enterprises, and to suggest problems and improvements. For 50 small and medium-sized enterprises located in ChungCheongBuk-Do, we carried out evaluation of exhaust ventilation systems(100 systems, 594 hoods in 50 factories) from March, 2006 to March, 2007. We evaluated hoods with smoke tester and measurement of capture velocity. In addition, we used several indicators for performance evaluation designed in this study. The rating and level of evaluation were based on the criteria of occupational health and safety act in Korea. The results were as follows; 1. Based on the smoke flow pattern and the criteria of occupational health and safety act, 67.8% of hoods were rated , good' level at smoke test whereas 26.3% were rated 'good' level at measurement of capture velocity. 2. 29.3% of hoods, of which ratio of measured actual air flow at hood(Qah) to required ideal exhaust air flow at hood(Qih) was 1 or more, were rated 'good' level. 3. The percentage of exhaust ventilation system, of which ratio of measured actual air flow at stack(Qast) to total required ideal exhaust air flow at hood(Qit) was 1 or more, was 29.0%. 4. For the ratio of measured actual air flow at stack(Qast) to existing air flow at fan(Qfan), only 5% of exhaust ventilation systems were 1 or more and 26.0% were 0.8 or more but less than 1.0. 6. For the ratio of measured actual air flow at stack(Qast) to total measured actual exhaust air flow at hood(Qath), 74.0% were 0.8 or more but less than 1.0. 7. The percentage of exhaust ventilation system, of which ratio of total measured actual exhaust air flow at hood (Qath) to existing air flow at fan(Qfan) was 0.8 or more, was 19.0%. 8. The percentage of exhaust ventilation system, of which ratio of total measured actual exhaust air flow at hood(Qath) to total required ideal exhaust air flow at hood(Qit) was 1 or more, was 26.0%. 9. For the comprehensive evaluation indicators designed in this study, 29.0% were 0.8 or more. We did not carry out this study with visual inspection. Moreover, we could not evaluate the static pressure in exhaust local ventilation system. However, we found that few exhaust local ventilations at small and medium-sized enterprises were rated 'good' level and that most exhaust local ventilations had 'poor' design and installation. Therefore, relevant professional manpower and enterprises have to construct exhaust local ventilation where it is needed, and technical guidance and economic support are needed to improve 'poor' exhaust local ventilation after self-evaluation.