Chemical plant maintenance electric accompanying heat: process and precautions

　　In chemical plants, electric heat tracing system is a kind of key equipment, which is used to maintain the temperature of pipelines and equipments to ensure the stable operation of the process. Regular overhaul of electric trace heat system is an important step to ensure its normal operation. This paper will introduce the process and precautions of overhauling electric trace heat in chemical plant in detail.

　　1. introduction in the chemical plant process, raw materials, semi-finished products and finished products transportation and storage are involved in temperature control. The electric accompanying heat system as an effective temperature control means, has been widely used in various fields of chemical plant. However, due to the long time operation and environmental influence, the electric accompanying heat system may appear the aging, the failure and so on the problem, therefore, the regular maintenance electric accompanying heat system for the stable operation of the chemical plant is vital.

　　2. Electric accompanying heat system introduction

　　Electric accompanying heat system is mainly composed of accompanying heat tape, temperature sensor, controller and power supply. As a kind of medium to transmit the energy, the accompanying heat tape converts into the heat energy through the electric energy, and carries on the heating and heat preservation to the pipeline and the equipment. Temperature sensor is used to monitor the temperature in real time, and the controller adjusts the output power of the heating tape according to the temperature change.

　　3. Preparation before overhauling

　　Before overhauling, it is necessary to submit the application for overhauling to the relevant departments, and it can be carried out only after getting approval. At the same time, to ensure that the site to meet the safety conditions, such as cutting off the power supply, hanging warning signs. For the overhaul program, need to organize the relevant personnel in advance for discussion and review, to ensure the feasibility and safety of the program.

　　4. When checking and replacing the accompanying heat of heat tape, firstly, observe whether the appearance is broken, aging and other phenomena, at the same time, check whether the connecting parts are fastened, whether the insulation layer is intact. Secondly, test the resistance value of accompanying heat tape, judge whether it is normal. If found with the tropical problems, should be replaced in time. Replacement of heat tape, should first cut off the power supply, and then remove the old heat tape, installation of new. In the process of installation, make sure the heating tape is close to the pipeline or equipment to give full play to its heating effect. At the same time, pay attention to the wiring of the heating tape to ensure its correctness. After the replacement is completed, carry on the power test, confirm that the accompanying tropical operation is normal.

　　5. Control system check and debugging control system is the core part of electric accompanying heat system, need to carry out a comprehensive check on it. Firstly, check whether the control line is intact, whether the terminal is tight. Secondly, check whether the temperature sensor works normally, test its signal output is accurate. Finally, check the controller to ensure that its logic function and parameter settings are correct. After the inspection, debug the control system. According to the process requirements, adjust the control logic and parameters of the controller, so that the electric heat tracing system can run stably under different working conditions. At the same time, in the debugging process testing system response speed, control accuracy and other performance indexes, to ensure that the electricity accompanies the heat system to meet the actual needs of chemical plants.

　　6. Safety precautions in overhauling the electric accompanying heat system, must strictly abide by the safety regulations, ensure the personnel and equipment safety. First of all, must cut off the power supply and then carry on the operation, avoids the risk of electric shock. Secondly, when dismantling and installing the accompanying heat tape, we should pay attention to prevent scalding and mechanical injury, and wear corresponding labor insurance products. In addition, if it involves high-altitude work or deep ditches and other dangerous areas, appropriate safety measures need to be taken to ensure the safety of the operation.

　　7.Conclusion chemical plant overhaul electric heat tracing system is a complex and critical process, involving a number of links and precautions. Through the electric accompanying heat system's understanding, the adequate preparation, the standardized operation, the safety protection and so on many aspects master, can guarantee the overhaul process smoothly and the chemical plant's stable operation. Especially need to pay attention to is, after overhaul completion also need to electric accompanied by heat system maintenance and maintenance, ensure its long-term operation performance. Only in the case of comprehensively mastering the process of overhauling the electric accompanying heat and precautions, can create a safe and stable operation environment for the chemical plant.