浸没燃烧式气化器运行效率及能耗成本核算

浸没燃烧式气化器(SCV)作为LNG接收站运行成本最高的装置,其运行效率计算和能耗成本核算备受关注。为此,首先以BWRS方程为基础求得SCV入口LNG和出口NG的焓值。然后,在焓值计算基础上,根据正割迭代法确定外输高压天然气经绝热降压后作为燃料气的温度,以获得燃料气加热器所提供的能耗。之后,计算出燃料气发热量,并根据能量守恒定律求得SCV效率和能耗成本。最后,为了方便LNG接收站使用,将此计算方法设计成一款计算软件以满足其需求;同时,通过实际运行数据对其可靠性进行了验证,并给出了能耗成本核算实例。结果证明,软件能较为准确地计算SCV运行效率和能耗,可为SCV的运行计算提供相应帮助和指导。

Operation efficiency and cost check of energy consumption of submerged combustion vaporizer

Submerged Combustion Vaporizer (SCV), as an equipment with the highest operating costs of LNG terminal, its calculation of operation efficiency and cost check of energy consumption are of much concern. Therefore, firstly, the enthalpy of inlet LNG and outlet NG of SCV was obtained based on BWRS function. Then, based on enthalpy calculation, according to Secant Iteration Method to confirm the temperature of fuel gas achieved from transportation high-pressure natural gas through adiabatic buck, the energy consumption supplied by fuel gas heater is obtained. Afterwards, the calorific value of fuel gas is calculated and according to the law of energy conservation, efficiency and energy costs of SCV are acquired. Finally, in order to facilitate the use of LNG terminal, this calculation method is designed to a calculation software to meet the needs; simultaneously, its reliability with the actual operating data and examples of costing accounting of energy consumption are verified. The results proved that the software can calculate SCV operation efficiency and energy consumption accurately, and provide help and guidance for SCV operation and calculation.