气田集气站放空系统存在的问题及解决方案

Problem and Solution on Combustible Gas Discharge System of Gas Gathering Station in Gas Field

气田集气站放空工艺是工艺装置、压力储罐等设施发生事故时可燃性气体安全排放的保障。随着站场处理工艺由简至繁,放空需求也越来越复杂。在放空过程中,高、低压放空管道间易发生窜气窜液的情况,冬季工艺低处易冻堵憋压,导致阀门泄漏;放空火焰易灼烤周边农作物,同时经常出现火雨现象,损坏周边地面设施及植被。为了消除安全环保隐患、保障站场平稳生产,通过调整高、中、低压放空工艺连接方式解决放空管道间窜气窜液问题,并根据火炬辐射强度计算调整火炬高度以缓解灼烤问题,由最初的单一放空管道系统+火炬,逐步调整为多级压力放空管道系统+分液罐+火炬的模式,缓解了火雨的问题。

Combustible gas discharge system of the gas gathering station in gas field are the security measures of gas venting,when the process equipments, the pressure tanks and other facilities have accidents. With the treatment processes on gas gathering stations becoming more and more, the combustible gas discharge systems get more complicated.Some stations are still using the early gas discharge systems which have some problems. The first is easily happened that gas- liquid mixture flowed from high pressure vent pipes to low pressure vent pipes, the low part of the pipes would freeze in winter, and the valves would leak out because of rising pressure. The second is often happened that the fire of the flares burned out the crops around, and made the fire rain phenomenon which would destroy the facilities and the vegetation on the ground.In order to solve the security and environmental problems and ensure the safe and stable production, we adjust the connection form of high, middle and low pressure vent pipes, calculate the intensity of radiation of the burning flares, and adjust the height of flares. By the ＂a single discharge system ＋ a flare＂ a gradual adjustment to＂multistage pressure discharge system＋a liquid separate pot＋a flare＂,the problems of fire rain phenomenon will be lightened.