Application of condensation and adsorption combined vapor recovery technology in oil depots

During the unloading of light oil products, the oil depot is subject to many interference factors, such as process and equipment, and inevitably a small part of the light components will volatilize, resulting in a large amount of oil evaporation loss. In addition to reducing the amount of oil products, the evaporation loss of oil products will also bury a large safety hazard, increase the probability of fire and explosion problems, and even cause serious pollution to the atmosphere, which is not conducive to the improvement of the economic benefits of the enterprise. To solve such problems, the vapor recovery device can be installed in the oil depot to avoid pollution to the environment, effectively save energy resources, and promote the improvement of oil quality. At present, the application effect of the condensation and adsorption combined vapor recovery technology is good, and it is worth wide application and promotion.

vapor contain a large amount of hydrocarbons. It is difficult to achieve the expected recovery effect by adopting a single method to recover vapor. Therefore, in the process of vapor recovery, relevant personnel need to take the specific situation as the basis and flexibly apply the recovery technology to ensure that the vapor recovery effect can reach the expected result and promote the improvement of recovery quality. At present, in terms of vapor recovery in my country, the application of condensation and adsorption combined vapor recovery technology is relatively extensive, which can achieve the best recovery efficiency.
In the condensation process, the main method is secondary condensation refrigeration. From an overall perspective, the vapor temperature is controlled within a reasonable range, specifically -75 °C, to ensure that most of the evaporated vapor can be condensed within this period of time, so that the evaporated vapor will be presented in the form of liquid.
For a small number of low-carbon alkane vapor, in the specific treatment process, the method of centralized adsorption can be used to quickly recover the vapor. In the vapor recovery stage, relevant personnel should select appropriate recovery devices according to the actual situation, such as vapor condensation system, vapor collection system, automatic transportation system, etc. [1]. At the same time, combined with the specific status of vapor evaporation in the oil depot, the vapor recovery and treatment mechanism is scientifically constructed, and the management and control of each link are strengthened to make the vapor recovery process safer and promote the improvement of recovery efficiency. During the treatment of vapor, the explosion-proof blower can be used reasonably to push the condensation host at the fastest speed to achieve cooling and enhance the operating reliability and stability of the sensor. During the use of the explosion-proof blower, it is necessary to apply automatic frequency conversion technology to it to speed up the operation speed of the equipment and enhance its operating reliability and safety. During the refueling process of the vehicle, it is necessary not only to strengthen the use of advanced means, such as condensation technology, but also to adopt effective methods to make the vapor present in liquid form, to ensure that the pollution generated by the vapor can be minimized, and truly achieve the goal of efficient recovery and utilization of vapor.

Through the analysis of condensation and adsorption combined vapor recovery technology, it can be seen that its application in oil depots can not only ensure the safety and stability of the vapor recovery process, but also meet the requirements of energy conservation and environmental protection.

(1) High safety factor. In the vapor treatment process of the oil depot, through the flexible use of condensation and adsorption combined vapor recovery technology and the reasonable formulation of treatment measures, the temperature can be effectively controlled to keep it within different ranges, such as 25 ℃, 4 ℃, -25 ℃, and -75 ℃. In the four ranges, the temperature drop gradient is obvious, the cooling effect is good, and the vapor temperature treatment effect can also meet the established requirements. During the treatment of vapor, condensation can be used to transform most of the vapor. The specific content is about 85%, and the vapor can be transformed from the original gaseous state to liquid state. After condensation, the remaining gas will be in a low-temperature and low-concentration state, at which point it will enter the activated carbon adsorption state, and then continue to condense through desorption to allow it to be liquefied. Under the combined application of condensation and adsorption combined vapor recovery technology, the entire vapor treatment process is relatively complete and can be carried out in a normal pressure environment. The system has strong operating efficiency and stability, good treatment results, no static electricity risk, and the entire treatment process is always in a safe environment.

(2) It has a good energy-saving effect. In the specific operation stage of the equipment system, the braking system plays a greater role. It can be combined with the refrigeration requirements to quickly recover the vapor and perform corresponding transformations, so that the vapor gradually change from gas to liquid, and the disadvantages of vaporization latent heat are handled well, truly meeting the requirements of energy saving and green environmental protection. In the technical application stage, the system has a good operating effect and can reasonably control the temperature. For the treated vapor, a multi-stage heat exchange method can be adopted to completely recover the energy in a short time, avoid excessive waste and consumption of energy resources, and achieve the goal of energy saving and environmental protection 

In addition, during the vapor treatment stage, by strictly implementing the treatment mechanism, the circuit structure of the cooling oil outlet pipes at all levels can meet the design standards when they are in operation, and the analysis can be detailed and unified, so that the structural design refrigeration system can operate smoothly, and various exhaust heat parameters can meet the corresponding standards, enhancing the efficiency and feasibility of vapor recovery and treatment. When using the condensation and adsorption combined vapor recovery technology, the oil cooling recovery device that raises the oil temperature to room temperature should be the technical core to promote the improvement of vapor recovery quality. In addition, this method can pay close attention to the oil outlet pipes at all levels, avoid the occurrence of low-temperature ice blockage problems, promote the heat exchange efficiency of the refrigeration system, and help improve the timeliness of vapor recovery.

3.1 Condensation and adsorption combined vapor recovery technology
When using the condensation and adsorption combined vapor recovery technology, the temperature of the volatile vapor is continuously reduced by means of multi-stage continuous cooling. At the same time, with the assistance of refrigeration technology, the heat of the vapor is replaced at the fastest speed to ensure that the total vapor can be quickly converted from the original gaseous state to the liquid state. At the same time, based on the difference in vapor pressure of hydrocarbon substances under different temperature conditions, the temperature is reduced to make the vapor pressure of some hydrocarbons in the container saturated, and the temperature of the vapor is continuously reduced by means of secondary refrigeration, specifically to -75 ℃. At this temperature, the vapor contain more hydrocarbons, which can be quickly condensed and present in liquid state. For the uncondensed vapor, in the specific processing process, it can first be allowed to enter the activated carbon adsorption system to complete the automatic processing and analysis through adsorption, and then the vapor can enter the refrigerator, and ensure that the other set of active systems is in operation, and continue to carry out subsequent operations, so as to discharge the gas and ensure that the gas meets the specified requirements. The condensed liquid gasoline will be pumped to the customer's designated oil storage tank