与惰气发生器相比氮气发生器优点
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与惰气发生器相比氮气发生器优点
ADVANTAGES OF NGG COMPARED WITH IGG
More and more product tankers and chemical tankers equipped with electric or hydraulic driven cargo pumps recently due to the market requirements, which can not take use of aux.
boiler exhaust for cargo tanks inerting, and have to be equipped with Inert Gas Generator (IGG) or Nitrogen Gas Generator (NGG).
根据当今市场需求，越来越多的成品油船、化学品船开始装设依靠电力驱动的货物泵或液压驱动的货物泵。这些船无法利用辅锅炉产生烟气对货舱进行惰化，因此必须装设惰气发生器或者氮气发生器来对货仓进行惰化。
IGG generates inert gas by burning fuel oil (MDO or MGO) to “consume” oxygen in air, and then supply to cargo tanks after scrubbing by sea water.
惰气发生器通过燃烧耗氧方式从空气中获得惰性气体，惰气在进入货舱前需要经过海水洗涤。
NGG generates inert gas (nitrogen gas) by separating oxygen from compressed air by membrane or adsorption material.
氮气发生器利用膜材料或者吸附材料从压缩空气中将氧气分离出来获得氮气。
Below calculations shows the benefit to the ship owners for them to install NGG in their new building projects or modify their existing vessels by install NGG.
通过以下计算，阐述在新建船项目或对现有船舶进行改造时安装氮气发生器对于船东益处。
The calculation is based on abt 50,000 DWT product/chemical tankers (HANDYMAX) with abt 4,000m3/hr. of max. cargo unloading rate, and required capacity of 5,000Nm3/hr. of inert gas or nitrogen gas, as an example.
本计算以50,000吨成品油/化学品船为例，以最大卸货速率4,000m3/hr计，则对惰气的或者氮气需求量为5000 Nm3/hr。
z IGG FUEL AND POWER CONSUMPTION PER HOUR
惰气系统每小时燃油量及功耗
Performance Data:
（技术参数）
Fuel (MDO or MGO) consumption : 420kg/hr.
油耗（MDO或者MGO）
Electric power consumption
(耗电量)
Draft fan and fuel pump power consumption : 70kw.hr.
通风风扇和燃油泵耗电量
Sea water pump : 37kw.hr.
海水泵
Total :107kw.hr.
总计
Diesel generator fuel consumption increased : 23.5kg/hr. (220g*107*10‐3)
柴油发电机燃油消耗增加量
(Converted the total power consumption into fuel (IF180 or IF380) consumption)
将耗电量转换成燃油（IF180 or IF380）消耗量
Total IGG fuel consumption per hour :443kg/hr. (420+23.5)
惰气发生器每小时燃油消耗总量 (10.6ton per 24hrs)
Remark: IGG consumes 10ton MDO or MGO + 0.6ton IF180 or IF380 per 24hrs.
备注：惰气发生器平均每天消耗约10吨（MDO或MGO）+0.6吨（IF180 或IF380）
z NGG ELECTRIC POWER /FUEL CONSUMPTION PER HOUR
氮气发生器每小时耗电量/燃油消耗量
a)Membrane type NGG power consumption
膜式氮气发生器耗电量:
Compressors (total) 压缩机 : 1200kw.hr.
Air dryer 冷干机 : 40 kw.hr.
Pre‐heater 加热气 :16 kw.hr.
Control circuit 控制电路 : 1kw.hr.
Cooling water pump 冷却水泵 : 25kw.hr.
Total(合计) : 1282kw.hr.
Diesel generator fuel consumption increased : 282kg/hr. (220g*1282*10‐3)
柴油机燃油消耗增加量:
(Converted the total power consumption into fuel (IF180 or IF380) consumption)
将耗电量转换成燃油（IF180 或者 IF38）消耗量:
Membrane type of NGG fuel consumption : 282kg/hr. (IF180 or IF380)
膜式氮气发生器燃油消耗量: (6.77ton per 24hrs. IF180 or IF380)
b)PSA type NGG power consumption
变压吸附式氮气发生器耗电量: