Design an alternate purge system for an LNG plant fired heater

S. Ahamad and R. Vallavanatt, Bechtel Corp., Houston, Texas LNG trade is expanding globally at a rapid pace. Natural gas is brought to market either with a traditional pipeline or through an LNG supply chain. Gas is the cleanest-burning hydrocarbon fuel, producing lower levels of greenhouse gas emissions than either oil or coal. The economics of an LNG plant are driven by the capacity of the plant, the price of LNG sold, the cost of feed gas, the installed cost and the operational costs of the facility. The total installed cost of fired heaters is also increasing quickly. The fired heater purge system proposed here can be installed for a fraction of the cost of widely available purge syste