2.2 Technical specification of the flare
1） The body of flare is a close-type tube of double-layer structure, of which the inner layer is made of high aluminum fiber heat insulation material while outer layer is made of Q235. Such structure will ensure the temperature at outer surface of tower body below 60℃ while the flare works with full load. To facilitate monitoring of the flare operation condition, peepholes, temperature monitors, air louver, inspection and repair platform are provided in the flare tower.
2） Auto-ignition of the flare system will be realized by means of PLC. The electromagnetic valve of ignition pipeline will be opened automatically by means of PLC, then spark plug will ignite the lighter. UV flame detector will confirm the ignition of lighter. The the main supply pipeline will be opened, and the main flame will be ignited by means of lighter and confirmed by UV flame detector. If it is not ignited, the main supply pipeline and ignition line will be closed immediately, and blower fan will be switched on till it is ignited successfully by repeating the above-mentioned operations. By means of autocontrol and multistage ignition mode, the ignition success rate is more than 99%.
3） Clean burning function: on the flare tower body, a temperature probe which is verified by a third party will be installed to detect the fuse gas temperature and feedback the same to PLC, which, based on the feedback signal, will regulate the fanner at the bottom of the flare tower body. By means of frequency conversion adjustment, the air flow entering the burning tower will be regulated the proper ratio of gas discharge to air flow. So that, when the heat load is more than 30%, at 80% height of flare body, the fuse gas temperature shall not be less than 600℃, methane burn-off rate greater than 90%￡?NOx exhaust less than 500mg/m3, which are compliance with the CDM project requirements
4） Safety protection function: the ignition technology of fare system is PLC controlled multilevel auto-ignition technology, equipped with UV probe monitoring and control. The ignition process is detailed in above clause 2. The flare burner itself have the anti-flash back function. Furthermore, flame arrester is mounted on the gasses supply pipeline nearby the inlet of flare. Upon each ignition or stoppage, it will be subject to blowing process to ensure safety.
5） Flare system is equipped with dehumidity filter and booster fan to provide simple dehumidity filtration and initiative boost to gasses. The gasses flowing from main supply pipeline will be branched into 3 lines (refer to flare flow chart), then enter into the burning tower after flow through control valve and flame arrester.
6） Filter , booster fan, control valve set and monitor of flare system are installed in 4 containers for each unit. Inside the container are also installed safety alarm devices as gas leakage detector and ventilation fan. If any function (such as extinguish) is found to be abnormal, the system will stop automatically for self protection. Furthermore, emergency buttons are mounted in the system.
3 Scope of supply
The gasses pretreatment system consists of 10 pretreatment units. Each unit includes the following components:
Inlet bivalve group
Primary filter
Heat exchanger
Boost Roots blower (including motor and frequency converter)
Fine filter
CDM metering device
Flame arrester
Outlet bivalve group
Base frame for handling
Besides the above-mentioned components, it also includes the following components as required by pretreatment function:
Intlet gasses quality monitor
Outlet gasses quality monitor
Refrigeration system
Electric and control system
Valve fluid power system
Auxiliary equipments includes the following components:
Fuel gas leakage monitoring system inside pretreatment workshop
Blast protection ventilation system inside pretreatment workshop
Accessory of gasses filter
Electric monorail crane
The steel platform and ladder as required by equipment inspection and repair
Relevant spare parts
2.2火炬的技术规范
1） 火炬本体采用封闭式火炬筒，双层结构，内层为高铝纤维保温材料，外层为Q235材料，此种结构可以确保火炬满负荷工作时，塔体外壁温度低于60℃。火炬塔上安设窥视孔、温度监测、通风百叶窗、检修平台及爬梯，方便监测火炬运行状况。
2） 火炬系统通过PLC实现自动点火功能。先通过PLC自动开启点火管路电磁阀，再自动启动高压包和火花塞将点火器点着，通过UV火焰探测器确认点火器已经点着。再开启主供气管路，通过点火器将主火焰点着，并通过UV火焰探测器确认。若未点着则立即关闭主供气管路、点火管路，开启吹扫风机，待吹扫完成重复上述动作，直至点火成功。系统通过此自动控制和多级点火模式确保点火成功率大于99%。
3） 洁净燃烧功能：火炬塔体上按高度方向上设置一个通过第三方校验的温度探测器，用于检测烟气温度，并将其反馈给PLC，PLC依据此反馈信号调节火炬塔体底部的通风机，通过变频调节进入燃烧塔内的空气量，确保燃气流量和空气燃料比合理，保证在30%以上热负荷时，火炬体80%的高度的烟气温度不低于600℃，甲烷燃尽率大于90%，NOx排放小于500mg/m3，满足CDM项目的要求。
4）安保功能：火炬系统点火技术为PLC控制多级自动点火技术，并配置UV探头监测协同控制，具体点火流程描述见上述第2条。火炬燃烧器自身有防止回火功能，同时在火炬入口处供气管路上设置阻火器作为防回火保护。每次点火或者停机，均由安全吹扫过程，确保安全。
5）火炬系统安装除湿过滤器和加压风机，用于瓦斯的简单除湿过滤和主动升压抽气。从进气主管出来分三路（见火炬流程图）经控制阀门和阻火器之后进入燃烧塔内。
6）火炬系统过滤器、加压风机、控制阀组和监测仪表分单元安装在四个集装箱内，集装箱内安装瓦斯检漏、通风风机等安全报警装置。当监测到灭火等系统异常,系统将自动停机保护，同时系统还设置有急停按钮。
3供货范围
瓦斯预处理系统采用10个预处理单元。每个单元包括以下设备：
进气双阀组
初过滤器
换热器
升压罗茨风机（包括电机和变频器）
精过滤器
CDM计量仪表
阻火器
出气双阀组
撬装用的设备底座
除了上述设备之外，还有实现预处理功能所需的下列配套设备：
进气气体品质监测仪表
出气气体品质监测仪表
制冷系统
电气和控制系统
阀门的液压驱动系统
辅机包括以下设备：
预处理车间的可燃气体泄漏监测系统
预处理车间防爆通风系统
瓦斯过滤器的附件
电动单轨起重机
设备检修操作所需的钢平台及梯子
相关备品备件
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