The impact of the properties of coking equipment accessories

【1】The impact of coking equipment accessories on the properties of coking raw material oil

The coking of the delayed coking heating furnace tube is the problem of coke generation,coking equipment accessories,and deposition in the furnace tube.The coking rate is the rate at which coke is adsorbed on the furnace tube wall.The influencing factors of coking speed mainly include the following aspects.

(1)Characteristic factor of raw material oil

The coking of the heating furnace tube is also closely related to the properties of the oil.At lower temperatures,the paraffin based components first decompose and coking,and the paraffin based components in the oil have a higher K value(characteristic factor).Due to the fact that paraffin based components are not a good solvent for asphaltene and resin,asphaltene will separate from the liquid phase and coke with increasing temperature.Oil containing a large amount of aromatic hydrocarbons with low K value will enter the critical decomposition stage of coking accessories at higher temperatures,and a large amount of vaporization will cause a sharp increase in the linear velocity inside the tube,resulting in impact and friction on the furnace tube,making it difficult for coke particles to deposit and adhere on the tube wall,thereby avoiding coking inside the heating furnace tube.Therefore,first determine the critical decomposition temperature range of a specific K-value raw material,so that when the medium passes through the critical decomposition temperature range at high temperatures,it is in a turbulent state and avoids being in a larger part of the heat intensity of the heating furnace tube,thereby slowing down the occurrence of coking in the heating afurnace tube.

(2)Raw oil contains salts and solid impurities

The salt content of coking raw materials has a significant impact on the coking of heating furnace tubes.On the one hand,salts are prone to crystallization and precipitation at high temperatures.Due to the enhanced adsorption between salts and metal surfaces at high temperatures,it is easy to cause scaling on the inner wall of heating furnace tubes;In addition,due to the local overheating and resistance caused by salts,it is conducive to the implantation and rapid growth of coke particles,which further exacerbates the coking of hydrocarbons.The raw materials contain insoluble solid impurities such as catalyst powder,which will also accelerate and induce the coking of high-temperature medium in the furnace tube of the heating furnace.When refining the catalytic oil slurry,in order to ensure the quality of Petroleum coke and produce Petroleum coke,it is necessary to control and measure the solid content in the catalytic oil slurry,otherwise not only the coking of the furnace tube will be accelerated,but also the ash content of Petroleum coke will increase.

(3)Conrad's residual carbon

The Conrad residue of residual oil is a commonly used indicator for predicting relative coking tendency,and its residue value is closely related to its chemical composition and structure.Although it cannot directly measure the coking amount of raw oil during the coking process,there is a very good correlation between the Conrad residue of residual oil and the coking coking amount.

【2】The significance of coke oven accessory management

Due to the different investment and management strategies of each enterprise's equipment,the selected equipment Computerized maintenance management system methods are also different.The enterprise should consider both its own actual situation and cost.It should not unilaterally emphasize the advantages and disadvantages of this approach.The key is to consider whether it is suitable for its own situation,in line with its own characteristics,and play to its own advantages.According to the current situation of coke oven accessories management,this paper briefly discusses the Computerized maintenance management system of coke oven accessories based on the author's experience in the industry,and analyzes the problems and Computerized maintenance management system solutions of the four major locomotive equipment of coke oven in the production and operation process.

Pursue the economic efficiency of equipment comprehensive efficiency and life cycle cost,apply and manage theories and methods,and scientifically manage coking accessories through technical and organizational measures.And the equipment management business starts with spot checks,which are the foundation of equipment preventive maintenance,the core of equipment stable operation management,and the extension and implementation of equipment management awareness.By conducting spot checks on equipment,accurately grasping the operating status of the equipment,taking early measures to prevent equipment deterioration,implementing planned maintenance,maintaining and changing equipment performance,reducing downtime,extending equipment service life,improving equipment efficiency,and reducing maintenance costs.

Equipment inspection is the starting point and foothold of equipment management,which runs through the entire process of equipment management.