In oil refining enterprises, different oil refining process would produce a certain amount and quality of wastewater. Based on the tracking model of material flow analysis method, all the water process was integrated into the water balance system, and the optimization model and evaluation index system of the water supply network were established. Taking the oil refinery in China as an example, the water network model of the oil refining production process was constructed, and the minimum water consumption problem of the current water system was determined. The method was optimized and evaluated. The results showed that the fresh water consumption could be reduced by 26.90% and the sewage discharge could be reduced by 84.42% after taking the water system optimization measures. Waterenvironmental efficiency increased by 15.34%.

Reducing energy-related carbon emissions while maintaining the industrial economic development was an inevitable choice for achieving sustainable development. Based on the extend Kaya identity and the logarithmic mean Divisia index method（LMDI）, a decoupling efforts decomposition model was constructed, which were adopted to analyze energy structure, energy intensity, industrial structure and industrial output for industrial carbon emissions impact and their relative decoupling efforts. The results showed that industrial output factor played a promoting role in industrial carbon emissions, energy intensity factor and industrial structure factor had some inhibitory effect, and energy structure factor's role was very limited. 2002—2012, Liaoning province was in a weak decoupling effort period, and the efforts was not ideal. 2012—2014, Liaoning province was in a strong decoupling effort period, the effects was significant for reducing carbon emissions.

In order to operate the town polyethylene gas pipeline safely and reduce the operational risk, the possible accidents were analyzed that the town gas polyethylene pipe could occur and its reasons. Using fault tree analysis method, both the fault tree model and its sub fault tree model of the town polyethylene gas pipeline were established. Through the calculation of the minimum cut sets, the minimum path sets and the structure importance of it, the possible malfunctions of the town polyethylene gas pipeline and the reasons were analyzed. The research results show that the failure of town polyethylene gas pipeline had a larger threat, and the threat of pipeline auxiliary facilities failure was less. Among the reasons of pipeline failure, the influence of the outside interference was the largest|the scratches and defects of the pipeline had a minor influence|and the aging pipes and stress effect on the pipeline had the least influence on the pipeline accidents.

The steam quality on the top of oil well is one of the important parameters during the thermal oil, and calculation software for the steam quality was developed by VB6.0,and the accuracy of the software was validated by experimental measurement data calculation. The impact the structural parameters (pipe diameter、the thickness of thermal insulation layer)and operating parameters(steam temperature、steam pressure and pipe inlet steam flow) of the steam quality and its change rule were analyzed systematically. Research results show that the steam quality on the top of oil well increased with the increment of the thickness of thermal insulation layer and pipe inlet steam flow and decreased with the increased of the pipe diameter、steam temperature and steam pressure. The thickness of thermal insulation layer was of the greatest impact among such factors, when the thickness of thermal insulation layer was greater than 60 mm and less than 80 mm, and each time the thickness of thermal insulation layer increased 20 mm, the steam quality increased 0120%.

For high temperature steam vapor transport in the buried pipeline causes heat loss and leads to energy waste problems，several factors affecting heat loss were analyzed. Steam pipeline of physical model and mathematical model was established to simulate the different steam temperatures，different buried depth and temperature distribution under different insulation thickness. And temperature distribution pipeline and the surrounding soil were calculated and analyzed under different conditions. The results show that the heat loss of buried steam lines with the steam temperature, buried depth, changed the thickness of the insulating thickness changes，and the biggest affect of the heat loss was the insulation thickness. When the insulation thickness was from 40 mm to 80 mm，the heat loss per unit length declined 110.591 W/m，and the thermal effect was smaller and smaller .

According to different damage process of natural gas pipeline leakage diffusion problems, using FLUENT software, CFD simulation model was established, and studied the different leak diameter of the effects on gas leakage diffusion area and simulated the natural gas leak and diffusion process between mountain and city terrain. The situation of wind speed changing along with the height and mass discharge rates variable with the time were taken into account and UDFs were programmed into the FLUENT to amend them. It concluded that the bigger hold can achieve the higher range, the max lower explosive limit of the high from the ground and downwind horizontal distances of diameter of 6.35 , 25.40 mm and 101.60 mm were 92 m and 322 m,122 m and 770 m, 408 m and 1291 m. When diffuses on the surface and in the soil, the 101.60 mm leak diameter had the maximum diffusion range. The biggest downwind horizontal distances were up to 80 m and 105 m respectively. This was because the gas lost a lot of turbulent energy influenced by the soil above the pipeline.