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 u 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 a water.for the horde
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 parating oxygen from compresd 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 vesls 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 bad 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）
msbcFuel (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.
applications
总计
Diel generator fuel consumption incread : 23.5kg/hr. (220g*107*10‐3)
心灵鸡汤 英文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.
english speechCooling water pump 冷却水泵 : 25kw.hr.
Total(合计) : 1282kw.hr.
Diel generator fuel consumption incread : 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:
Compressors 压缩机 : 800kw.hr.
Air dryer 冷干机 : 25kw.hr.
Control circuit 控制电路 : 1kw.hr.
Cooling water pump 冷却水泵 : 20kw.hr.
Total 合计 : 846kw.hr.
Diel generator fuel consumption incread : 186kg/hr. (220g*846*10‐3)
柴油机燃油消耗增加量
复古风英文(Converted the total power consumption into fuel (IF180 or IF380) consumption)
将耗电量转换成燃油消耗量
PSA type of NGG fuel consumption : 186kg/hr. (IF180 or IF380)
变压吸附式氮气发生器燃油消耗量: (4.67ton per 24hrs. IF180 or IF380)
IGG OR NGG RUNNING HOURS PER YEAR
惰气发生器或氮气发生器每年运行时间
Unloading hours per voyage : 24 hr.
卸货时间/航次
Topping‐up operation per voyage : 6 hr.
补气操作时间/航次
Voyages per year : 24 voy.
longshe
航次/年
Total running hours : 720 hr. [(24+6)*24]
总运行时间
IGG FUEL CONSUMPTION PER YEAR :319ton/y.
惰气发生器每年燃油消耗量 (300ton IF380 + 19ton of MDO)
MEMBRANE TYPE NGG FUEL CONSUMPTION PER YEAR :203ton/y. (IF180 or IF380)
膜式氮气发生器每年燃油消耗量
PSA TYPE OF NGG FUEL CONSUMPTION PER YEAR :134ton/y. (IF180 or IF380) PSA式氮气发生器每年燃油消耗量
1.FUEL COST CALCULATION PER YEAR
每年燃油成本计算
Fuel Price Last Five year IF180 : USD370.‐/ton.
最近5年来燃油价格 IF380 : USD350.‐/ton.
MDO : USD750.‐/ton.
IGG FUEL COST PER YEAR : USD231,840.‐ (750*300 + 360*19)
惰气发生器每年燃油成本
NGG(MEMBRANE) FUEL COST PER YEAR :USD73,080.‐ (360*203)
膜式氮气发生器每年燃油成本
write的过去分词
NGG(PSA) FUEL COST PER YEAR :USD48,240.‐ (360*134)
变压吸附式氮气发生器燃油成本
NGG (MEMBRANE) SAVED FUEL COST PER YEAR : USD158,760.‐
(COMPARED WITH IGG)
相比惰气发生器，膜式氮气发生器每年可节约成本：
NGG(PSA) SAVED FUEL COST PER YEAR : USD183,600.‐
(COMPARED WITH IGG)
相比惰气发生器，变压吸附式氮气发生器每年可节约成本：
2.NEW BUILDING COST
建造成本
(the new building cost consists of equipments purchasing cost and shipyard installation cost) 新建成本包括设备采购成本和船厂安装成本。
NGG new building cost
氮气发生器建造成本
NGG equipment purchasing cost(5,000Nm3/hr. 95% of purity) : USD1,200,000.‐
氮气发生器采购成本
Yard installation cost : USD3,000.‐
Including discharge pipe and cooling water installation.
船厂安装成本包括散热管道和冷却水管系安装。
__________________
Total : USD1,203,000.‐
IGG new building cost
惰气发生器建造成本
IGG equipment purchasing cost : USD350,000.‐
惰气发生器采购成本
(5,000Nm3/hr. 95% of purity after scrubbing and deck al)
(经过洗涤塔和甲板水封塔后得到流量为5,000Nm3/hr. 纯度95% 惰气)
戴西
Yard installation cost : USD100,000.‐
Including scrubber drain line, deck al drain line,
Much larger discharge line of IG, and special
Fuel tanks
船厂安装成本（包括洗涤塔排污管线，甲板水封排污管线，较粗惰气管线和专用燃油管）
____________________
Total : USD450,000.‐the crowded room
Remark:
备注：
IGG scrubber and deck al drain lines should be specially corrosion treated to protect sulphur acid corrosion.
惰气发生器水封塔和甲板主管线需要经过酸化处理防止受到硫酸腐蚀。
IGG discharge line is much bigger diameter than NGG, due to lower pressure.
由于惰气发生器系统压力较低，它的管道直径比氮气发生器管道直径要粗很多，
IGG needs a special fuel oil tank and a special rvice tank for IGG.
惰气发生器需要一个专用燃油罐和日用罐。
THe new building cost recovered in about three or four years.by adopting NGG in a new building project
通过采用氮气发生器用于新造船项目，其成本大约在3到4年时间能够收回。
THE NGG ADVANTAGES COMPARED WITH IGG
和惰气发生器相比氮气发生器优点
z NGG can satisfy all of cargoes handled by product/chemical/LPG/LNG tankers without any pollution or quality reduction to the cargoes, even food oil or liquid
sugar.
通过成品油船，LPG船、LNG船，氮气发生器能够满足所有货物装载（即使装
载食用油和液态糖浆），对货物没有任何污染且不会降低货物质量。
z Although NGG new building cost is much higher than IGG, but saves much fuel cost.
(See above.) That means the new building cost difference can be recovered by fuel
cost caving within three years, and the ship owners has about ven (7) million of
US Dollar of benefits in the ship’s whole life (30years).
虽然氮气发生器建造成本比惰气发生器高很多，但它能够节约更多燃油成本。
见以上计算。也就是说新造成本差额能够在3年时间内通过燃油成本抵消。
z NGG does not corrode IG deck main line and inside of cargo tanks.
氮气发生器不会对甲板主管线和货罐内部造成腐蚀。
z The ships do not always unload cargoes with Max. unloading rate. Sometimes the ship’s unloading rate is limited by terminals’ receiving ability. NGG capacity is
adjusted automatically according to cargo unloading rate, e.g. the less cargo pumps
running, the less compressors’ power consumption. But IGG always consumes
same amount of fuel when its running, and the surplus IG generated shall be
by‐pasd to funnel.
货物并非总是在最大卸载速率卸货，有时轮船的卸载速率受到接收端能力限制。
氮气发生器流量能够根据货物的卸载速率自动调节，例如当货物泵以最小速率
运行时，空压机功耗最低，但是惰气发生器一旦运行后总是消耗同样数量的燃
油，且惰气发生器产生多余惰气通过烟囱排出。
z NGG does not cau any pollution, and IGG drain out into a with dirty water containing sulphur acid.
氮气发生器不会造成任何污染，而惰气发生器排向大海中污水中含有硫酸。
z NGG does not need deck al and deck al pumps.
氮气发生器不需要甲板水封塔和甲板水封泵。
