Flame Arresters

For Mechanical Protection and Safety For many years, A.H. Lundberg, Inc. has been designing Noncondensible Gas Collection Systems. Such systems contain combustible or potentially combustible mixtures of gases being transferred to points of incineration. Experience has shown a need for safety measures to protect the process equipment. Traditionally, Flame Arresters were provided for part of this protection. A.H. Lundberg, Inc. designs and supplies Flame Arresters to meet the rigorous standards for these Systems.

A Typical NCG System At each emission source in the system, several safety devices are employed. A pair of interlocked valves block and vent the source if an upset is detected. To back-up these valves in case of valve failure, a rupture disc is installed and set for about 10 psig. A flame arrester is also installed at each source. Most noncondensible gas sources are hot and saturated with moisture. Adequate condensing of moisture is essential for efficient gas combustion. To reduce combustion problems, the gases should be cooled to the 1200F range. This can be accomplished in an indirect cooler or a direct contact cooler with indirect heat removal. Frequently, the mill will elect to install a Lundberg high efficiency RSH scrubber ahead of the gas cooler. In this unit, the collected NOG are passed through a packed column for removal of hydrogen sulfide and methyl mercaptan by absorption in white liquor. The total TRS in the NCG stream is reduced. Condensate from the cooler can be added to the white liquor. Following the gas cooler, the gases are piped to the combustion chamber of the incinerator boiler or lime kiln where they are burned at a temperature exceeding 1,600 F.

Features

The Flame Arrester can be easily removed for cleaning without pipeline disturbance. Connections are provided for measuring the pressure drop through the pack. A pressure differential gauge is available.

The Flame Arrester is shipped completely assembled with flanged connections to 150 pound drilling standards on both ends.

The eccentric configuration permits either vertical or horizontal installation without condensate accumulation.

The standard Flame Arrester is manufactured in T-316 stainless steel, with carbon steel backing flanges, unless otherwise specified.

The units are sized and selected in accordance with the volume of gases passing through the piping system.

A.H. Lundberg, Inc., 2803 Hewitt Ave., PO. Box 1506, Everett, WA 98206. Tel: 425-258-4617; Fax: 425-259-1037.