The VOCs control and oil vapor recovery projects in the coal chemical industry achieve continuous and stable emissions at the mg level, meeting the required standards

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Coal chemical engineering refers to the process of using coal as a raw material and undergoing chemical processing to convert it into gaseous, liquid, and solid fuels as well as chemicals. It mainly includes coal gasification, liquefaction, carbonization, and tar processing. The current development direction of the coal chemical industry is the deep processing and comprehensive utilization of coal tar, such as the hydrogenation of coal tar to produce light oils, in order to manufacture chemical products with high added value. During the operation of units in coal chemical industry such as coking, chemical product production, anthracene oil hydrogenation, and crude benzene hydrogenation, VOCs are emitted during the production, storage, transportation, and filling stages. The main sources of these VOCs are high-molecular-weight anthracene oil, washed oil, residue oil, and triphenyls ； Light components are processed into light aromatics (naphtha) and heavy aromatics (diesel), etc. Before environmental protection measures were implemented, many coal chemical enterprises released these oils and gases directly into the atmosphere. This not only wastes resources but also pollutes the environment. With the growing emphasis on environmental protection and energy conservation, determining an economically viable way to recycle these oil and gas streams, which feature large fluctuations in concentration and flow rate as well as complex compositions, has become a challenge for the industry. The main challenges in oil and gas recovery within the coal chemical industry are as follows: 1) The volatility of different oil products varies significantly, resulting in varying concentrations of oil and gas; therefore, the recovery processes must be capable of adapting to various recovery conditions. The concentration of light components is high, while the concentration of heavy components is low ； The oil and gas concentration is high during loading, while it is low in the storage tanks… How to economically separate and recover all the oil and gas within a single system while ensuring compliance with emission standards is a key concern for the industry ； 2) Oil and gas treatment facilities are subject to strict requirements regarding exhaust emissions; they must continuously meet the relevant national and local standards, and in some cases, operational data may even need to be transmitted online ； 3) Intermittent discharge, with unstable flow rates and concentrations, poses a significant challenge to the stable operation of oil and vapor recovery systems ； 4) Heavy components tend to adsorb easily but are difficult to desorb, posing higher requirements for adsorption separation ； 5) Oil and gas contain a certain amount of moisture, which may cause solidification at low temperatures; the adsorption step may have an impact on the adsorbent ； 6) Heavy components may solidify or become viscous at low temperatures ； 7) Oil and gas may contain sulfides and nitrogen oxides, making incineration an unsuitable treatment method; this imposes higher requirements on the separation efficiency of recovery processes ； Beijing Xinnuo Haibo Petrochemical Technology Development Co., Ltd. is a **high-tech enterprise** whose main objectives are the research and development, design, manufacturing, and provision of services related to gas recovery and treatment technologies. It possesses extensive technical research and development experience as well as industrial practice experience in gas recovery and treatment for industries such as petrochemicals, coal chemicals, oil depots, and ports. The company has conducted targeted research on the challenges faced in the recovery of oil and gas in coal chemical industries, and has achieved several successful engineering implementations. In the field of oil and gas recovery projects for coal chemical industries, the company has provided comprehensive environmental protection solutions to various coal chemical enterprises such as Hengxin Technology, Rongxin Coal Chemical, and Weijiao Group. It includes personalized oil and gas recovery devices as well as a collection and transportation system for oil and gas pipelines in storage tanks, systematically addressing the challenges related to the transportation of oil and gas within storage areas, loading operations, and the recovery of oil and gas from such areas. VOCs in exhaust gases can be removed