Control of Volatile Organic Compounds Emissions from Manufacturing

2. Sampling and Analytical Techniques. Integrated waste gas
samples were collected in bags. The analysis was done on a Carle
analytical gas chromatograph having the fol lowing col umns :
1. 6-ft OPN/PORASILR (80/100).
2. 40-ft 20 percent SEBACONITRILER on gas chrom. RA 42/60.
3. 4-ft PORAPAKR N 8o/ioo.
4. 6-ft molecular sieve bx 80/100.
Stack gas samples were collected in 30 to 50 cc syringes via a
tee on a long stainless steel probe, which can be inserted into the
stack, at nine different locations, They were then transferred to a
smaller 1 cm3 syringe via a small glass coup1 ing device sealed at both
ends with a rubber grommet. The 1-cm3 samples were injected into a
Varian 1700 chromatograph for hydrocarbon analysis. The chromatograph
has a 1/8-in. x 6-ft column packed with 5A molecular sieves and a
1/4-in. x 4-ft column packed with glass beads connected in series with
a bypass before and after the molecular sieve column, control 1 ed by a
need1.e valve to split the sample. The data are reported as ppm total
HC, ppm methane, and ppm non-methane hydrocarbons (NMHC). The CO
content in the stack was determined by using a Ki tagawa sampl ing
probe.
The o2 content in the stack was determined via a Teledyne
02/combustible analyzer.
3. Test Results. Petro-Tex has been involved in a modification
plan for its '0x0' incinerator unit after startup. The facility was
tested by the company after each major modification to determine the
impact of these changes on the VOC destruction efficiency. The incinerator
showed improved performance after each modification and the destruction
efficiency increased from about 70 percent to above 99 percent, Table
D-4 provides a summary of these test results. The modifications made
in the incinerator are described below.
November 1977
Test data prior to these changes showed the incinerator was not
destroying hydrocarbons as we1 1 as it should (VOC destruction efficiency
as low as 70 percent), so the following changes were made:
front;
1. Moved the duct burner baffles from back of the burner to the