The contents of major work in this program include: the modification of best available control technology of stationary pollution sources for power plants and glass industries, the enhancement of air pollutant emission standard of ”Air pollution control and emission standards for stationary pollution sources”, the review of “Air Pollution Control and Emission Standard of Volatile Organic Pollutants”, the emission inspection of volatile organic matter for petrochemical industry as well as the fulfillment of petroleum recycling at gas stations.
For the modification of best available control technology of stationary pollution sources, it is suggested that NOx and SOx emission standard for coal-fired power plants can be strictly limited to 30ppm. NOx for glass kiln with auxiliary-air is suggested emission concentration less than or equal to 250ppm or the emission reduction rate be greater than or equal to 30%; combustion supported with pure oxygen needs to meet emission less than or equal to 1.85 kg/Gcal.
For the ”Air pollution control and emission standards for stationary pollution sources”, TSP is suggested the emission standards of solid fuel are 50 and 150mg/Nm3 according to the scale, and those for non-solid fuel are 50, 100 and 150 mg/Nm3 respectively. For SOx, it is suggested that the limit value of sulfur is 0.3% of liquid fuel, calculating with mass balance to respond to an emission standard of 150ppm; for NOx, it was suggested that the modification of current pollution source standard be consistent with new pollution source. The pollution source modified to take effective is strictly established at 20% of reduction rate with current pollution source standard. For glass industry, the emission standard is 300ppm when modifying the NOx standard as air combustion supporting; when combustion is supported with pure oxygen, the emission standard is 2.22 kg/Gcal. In addition, arsenic is a hazardous air pollutant with carcinogenic. Arsenide must not be contained in raw materials according to the regulations.
In the review of “Air Pollution Control and Emission Standard of Volatile Organic Pollutants” for flares, the main modification is to specify the operating time. The operating conditions conform to the design conditions. The operating time must not be over 30 days annually. For those over 30 days, air pollution fees must be double calculated; moreover, in order to control the emission situation, wastes for special burning event must be specified to analyze. For equipment and component, the modified items include: the defined value of leakage is modified from 2,000ppm to 1,000ppm; equipment and component fitted into a pressure tank are under control; pressure relief devices shall be connected to the closed collection system; the leakage regulations are modified the number of leakage source must not be greater than 3 when the audit number is less than or equal to 200 and the number of leakage source must not be greater than the audit number of 1.5%, when the audit number is greater than 200. For the volatile organic liquid tank, the modifications include: the tank targets consider vapor pressure and hazardous chemicals; new fixing roof tank must be installed with a pressure relief valve; a guide on external floating roof tank shall be installed with a slit cover. An external floating roof tank is installed with a roof cover; the concentration at an opening of internal floating roof tank must not be greater than the lower limit of explosion 30% (newly installed) or 50% (existing).
This program completes over 150-point inspections of equipment component for petrochemical industry. It is found out there is a trend to decrease the emission coefficient of gas valve and light liquid pump, showing a decreasing trend of the leakage rate in Taiwan. The main reason is that novel processing and components have been gradually replaced, so that can improve the leakage rate. However, the leakage rate of flange and light liquid valve roughly increases.
In order to soundly fulfill petroleum recycling policy, the functions of database system have completed a preparation for combining a database architecture of ”Gas Station Information System” with the Soil Foundation. When performing an inspection and maintenance of petroleum recycling equipment at a gas station, we can find out the main reason why a leakage inspection fails is due to a leakage of vacuum pressure valve (PV valve), following pipe looseness or leakage. The main reason why the gas-oil ratio fails is due to abnormal motor pumping power, following oil accumulated in a tube. We suggest they can be found or avoided in advance via daily inspection or maintenance.