Exhausting oil and gas VOCs - a modular combined high-efficiency oil and gas recovery technology based on oil and gas emission traceability

Oil products are volatile in the process of production, storage and transportation and produce oil and gas leakage, which not only causes resource and economic losses, but also seriously pollutes the atmospheric environment
.
Professor Huang Weiqiu, Director of the Oil and Gas Recovery Engineering Technology Research Center of Changzhou University, was the first to complete the "Modular Combined Efficient Oil and Gas Recovery Technology Based on Oil and Gas Emission Traceability" to successfully solve the above problems, and recently won the first prize of scientific and technological progress of the Chinese Chemical Industry Society
.

Oil and gas contain a variety of volatile organic compounds (VOCs), which are important factors causing photochemical smog, increased ozone concentration and organic aerosols, which contribute to the formation of haze weather
.
In recent years, China has taken the reduction of VOCs including oil and gas emissions as the key work
of ozone pollution prevention and control and winning the blue sky defense war.

Huang Weiqiu said that the oil and gas recovery system includes the oil and gas collection and recovery process
.
China's research and development of oil and gas recovery technology and equipment started early, but the research on oil and gas emission laws, the effectiveness of oil and gas collection and the automatic control chain level did not pay enough attention, which affected the overall benefits
of oil and gas recovery.
In recent years, China has successively set up oil and gas recovery devices in refineries, tank farms, gas stations, docks, etc.
, but there is room for optimization and improvement in terms of technological advancement, policy adaptability, benefit prominence, and equipment durability
.

Based on this, Huang Weiqiu led the project team to use simulation software and visual programming tools to collaborate on the research and development
of basic theories, key technologies and complete sets of equipment for the whole process control, separation and purification of oil and gas pollution, separation and purification and resource utilization from the aspects of emission source tracking, research and preparation of separation mechanism of key functional materials, integration and optimization of recovery process, and establishment of expert management system.

In terms of theoretical support and design basis of oil and gas recovery technology, the project team established an advanced wind tunnel platform and gas diffusion coefficient, invented vapor pressure devices and methods, proposed mass transfer factors for oil and gas molecular diffusion and convective diffusion, established calculation methods for key parameters such as oil and gas molecular diffusion coefficient and centralized normalized convective diffusion coefficient, vapor pressure, molar mass, etc.
, and solved the technical bottleneck
that is difficult to quantitatively measure convective diffusion and its contribution to oil and gas mass transfer 。 The project team also proposed a variety of numerical simulation methods for oil and gas mass transfer to reveal the law and internal mechanism of oil and gas evaporation emission under complex oil operating conditions.
Develop a number of evaluation software, publish academic works, and build a complete basic theoretical system
of oil evaporation loss.

For different oil and gas emission sources, the project team developed a variety of composite functional material preparation methods, which solved the problems
of conventional activated carbon and silica gel adsorption capacity, difficult hydrophobicity and regeneration, and high thermal effect.
They overcame the problems of difficult in-situ loading and poor stability of bitumen and graphene oxide, and the thermal conductivity, n-hexane vapor and oil and gas adsorption capacity of the prepared adsorption materials were 134%, 114% and 100%
higher than those of activated carbon, respectively.
The project team also invented a multi-functional adsorber, adsorption tower packing sampling device, controllable adsorption tower discharge port, etc.
, which solved the problems of poor adsorption effect, slow adsorption and desorption, and difficult discharge of adsorption tower, and improved the operation and recovery efficiency
of the recovery system.

The project team also invented a series of integrated recovery process of oil and gas modules, which realized a high degree of technical and economic unification and optimization of recovery rate, emission concentration, equipment investment, and operating energy consumption.
An intelligent platform for the assessment, design and management of organic waste gas resources has been developed, which shortens the design cycle of oil and gas recovery devices and reduces R&D costs
.
The core materials, key structures, integrated processes and intelligent platforms developed by them have formed a complete set of technologies for combined customized recovery of oil and gas modules, with a recovery rate of more than 99%.

In April 2022, the project results passed the appraisal
of scientific and technological achievements organized by the China Petroleum and Chemical Industry Federation.
According to the appraisal opinion, the project optimizes the oil and gas recovery process of absorption, adsorption and condensation, builds a modular combined and efficient integrated oil and gas recovery system, and the oil and gas recovery rate reaches more than 99%, the social, environmental and economic benefits of the project results are remarkable, and the technology has reached the international advanced level
.

In the next step, the project team will broaden different application scenarios, customize and develop core functional materials and key structures, realize refined and efficient recovery of oil and gas VOCs, and further improve industrial scale to achieve scale competitiveness and efficiency.
Starting from the top-level design, the design threshold and comprehensive benefits of carbon emission reduction of oil and gas recovery are considered from the whole process and all factors; Actively participate in the improvement and optimization of government and industry oil and gas VOCs emission standards, technical specification systems, and testing method systems, assist the government and industry to effectively supervise VOCs governance projects, and help achieve the "dual carbon" goal
.