Increasing Natural Gas Boiler Efficiency by Capturing ...
2020-2-5 · Stack Gas Heat Recovery System utilizing a condensing heat exchanger was designed, fabricated, and installed to recover the waste flue gas energy from a natural gas fired boiler. The recovered energy is used to preheat boiler makeup water and combustion air. Preheating makeup water, using the energy in the stack flue gas, increases boiler efficiency 6 percent to 8 percent annually. The Heat Recovery System is a dual-stage condensing economizer designed to conserve energy by preheating both boiler makeup water and a glycol solution. The first stage preheats boiler makeup water. The second stage heats a glycol solution used to heat combustion air. Combustion air, previously heated using direct-fired natural gas, uses 'excess' heat available from the flue gas to eliminate the use of natural gas in the heater of the building air handler. The Olin Niagara Falls Plant is part of the Olin Corporation Chlor-Alkali Division. The Niagara Plant produces chlorine, hydrochloric acid, bleach and caustic soda for industrial users. The objective of the Stack Gas Heat Recovery system …
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