Gas or Liquid - High Levels of NOx

Wastes are supplied to a disposal process in the form of either gas, liquid or solid, or a combination thereof. A two-stage combustion process is used to dispose of either a gas or liquid that, if oxidized in a single-stage combustion process, would produce a flue gas containing excessive amounts of NOx. Recycled flue gas cooling in lieu of steam or water is an integral part of this process.

Figure 3 - a reduction furnace, quench section, ReOx furnace, heat recovery boiler and vent stack

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In the reduction furnace, a high-temperature reducing (less than stoichiometric air) environment converts the fuel into H2, H2O, CO and CO2, and the NOx present into N2. The quench section cools the fuel gas to approximately 1400° F by directly contracting it with a cool recycled gas. The purpose of this step is to lower the fine thermal oxidation temperature. The ReOx furnace converts the H2 to H2O and CO to CO2; the heat recovery boiler produces steam in cooling the flue gas to 350° F.

John Zink Company, LLC
11920 East Apache
Tulsa, OK 74116
United States of America
+1-918-234-1800

email: info@johnzink.com