| dc.description.abstract | Rotogravure printing and plastic coating processes, regulated under stationary source pollution control, often treat volatile organic waste gases (VOCs) using optimal available control technologies, including thermal incineration techniques such as RCO (Regenerative Catalytic Oxidizer) and RTO (Regenerative Thermal Oxidizer). During the construction phase of waste gas incinerators, it is crucial to assess the sources of process waste gases. High-concentration waste gases can cause overheating and system shutdowns, resulting in forced exhaust emissions and air pollution issues, while low-concentration waste gases may lead to excessive natural gas consumption and increased operational costs.
This study employs a systemic mechanism analysis approach to comprehensively investigate the operation mechanisms of the process pollution sources and waste gas incineration systems at the printing plant. Analysis is conducted at the system, subsystem, and component levels to identify root causes of issues. By collecting and analyzing data on material composition characteristics of process pollution sources, design-stage parameters of the incinerator, and actual operational data, this study identifies discrepancies between waste gas concentrations, heat values, and incinerator design conditions. Data collected includes operational hours and material compositions of each process pollution source, as well as pre-construction operational conditions and actual operation data of the incinerator.
Using operational data, material usage, and composition analysis at the process pollution source, the mass flow rate, total hydrocarbon concentration (THC), and heat value of waste gases are calculated to evaluate the compatibility of exhaust gas conditions from RCO process pollution sources #A and #B with the two incinerators. Process changes are implemented by connecting ductwork and installing proportional dampers to direct high-concentration waste gases to the RTO system, improving RCO treatment efficiency and compliance with environmental regulations. This change also reduces natural gas consumption in the RTO system, lowering environmental treatment costs.
The RCO system′s design THC value is 2000 ppm. Before improvements, there were 73 exceedances, whereas none occurred post-improvement. The combustion temperature exceeded the design value of 520°C in 34 instances prior to improvement, with none afterward. The removal efficiency fell below 93% in 148 cases before improvements, reduced to 13 after improvements. The total heat value of RTO process waste gases increased from 525,277.61 Kcal/hr to 739,166.41 Kcal/hr after the improvements. Monthly natural gas expenses were reduced by NT$136,994.46. | en_US |