Patent ID: 6948929

Claim:
A combustion-type waste gas treatment system comprising: a burner; a combustion chamber downstream of said burner, said burner and said combustion chamber being shaped and arranged so that combustion flames formed in said burner extend toward said combustion chamber; a waste gas supply line for introducing a waste gas into the combustion flames so as to oxidatively decompose the waste gas; an oxygen gas supply line for supplying oxygen gas; a fuel gas supply line for supplying fuel gas; a mixer outside said burner, said mixer being connected to said oxygen gas supply line to receive oxygen gas therethrough, being connected to said fuel gas supply line to receive fuel gas therethrough, and being shaped and arranged to mix together the oxygen gas and the fuel gas to thereby form a mixed gas; a mixed gas supply line connecting said mixer to said burner so as to supply the mixed gas formed in said mixer to said burner; a first stop valve in a downstream section of each of said oxygen gas supply line and said fuel gas supply line; a first check valve in a downstream section of each of said oxygen gas supply line and said fuel gas supply line, and located upstream of said first stop valve in each of said oxygen gas supply line and said fuel gas supply line; a second check valve in an upstream section of each of said oxygen gas supply line and said fuel gas supply line; a second stop valve in an upstream section of each of said oxygen gas supply line and said fuel gas supply line, and located upstream of said second check valve in each of said oxygen gas supply line and said fuel gas supply line; and a branch valve for injecting a gas for leak checking each of said oxygen gas supply line and said fuel gas supply line, located between said first stop valve and said second stop valve in each of said oxygen gas supply line and said fuel gas supply line.