CN-121997554-A - Calculation method for electromagnetic heater energy efficiency evaluation

Abstract

The method adds the influence of heat absorbed by a medium, stray magnetic fields in a system, environmental heat dissipation, a control system outside the system and a machine room cooling power consumption factor on the efficiency of the electromagnetic heater, and constructs the following energy efficiency evaluation calculation method: According to the invention, the simulation calculation result of ANSYS is compared with the external surface temperature and the heat dissipation loss rate of the electromagnetic heater model obtained through experiments, the surface temperature of the heat preservation layer and the external surface temperature of the exposed steel pipe at the top are basically completely matched with the temperature measured through the experiments, the result provides a basis for calculating the accuracy of the heat flux density of the external surface, the reliability of the electromagnetic heater energy efficiency evaluation model is also verified, and the energy efficiency evaluation result is more accurate.

Inventors

• WANG QIUPING
• LI BINGQIANG
• ZHAO WEIGANG
• ZHANG YUFU
• SU HOUDE
• ZHAO ZHELONG
• LI ZHIXIA
• SU SIYAN
• NI JIXU
• LEI SHASHA

Assignees

• 机械工业兰州石油化工设备检测所有限公司
• 甘肃蓝科石化高新装备股份有限公司

Dates

Publication Date

20260508

Application Date

20251225

Claims (1)

1. 1. The calculation method for evaluating the energy efficiency of the electromagnetic heater is characterized by adding the influence of heat absorbed by a medium, stray magnetic fields in a system, environmental heat dissipation, a control system outside the system and cooling consumption energy factors of a machine room on the efficiency of the electromagnetic heater, and constructing the following calculation method for evaluating the energy efficiency: in the formula, The correction coefficient of the electric energy is used for considering the control system, the pressure drop consumption and the cooling consumption of the machine room in actual application; The heat obtained by the electromagnetic heater, namely the heat absorbed by the medium, is kJ/h; kJ/h for the electric energy consumed by the electromagnetic heater, G is mass flow, kg/h, C is the average mass specific heat capacity of the heating medium between t 1 and t 2 , k/(kg DEG C), t 1 is the heating medium inlet temperature DEG C, t 2 is the heating medium outlet temperature DEG C; is the consumed electric energy, kw.h.

Description

Calculation method for electromagnetic heater energy efficiency evaluation Technical Field The invention relates to the technical field of energy efficiency calculation, in particular to a calculation method for evaluating the energy efficiency of an electromagnetic heater. Background Under the energy crisis and environmental constraints, efficient utilization of energy has become a hot spot in recent years under discussion in academia and industry. The oil and gas field enterprises are large energy production households and large energy consumption households. The conventional energy-saving monitoring and technical improvement measures mainly aim at energy conversion equipment such as boilers, heating furnaces, compressors, pumps and the like, along with the deep development of work, the energy-saving potential of the equipment is completely excavated, and the improvement technical resources are continuously put into the equipment according to the principle of decreasing marginal benefits, so that the energy-saving monitoring and technical improvement measures have little benefit. For a process system, thermodynamic system engineering reveals that the main energy dissipation of the system is not caused by conventional energy supply and conversion equipment, but is determined by the performance of process equipment such as mass transfer, heat transfer and the like, so that the development of energy-saving monitoring and evaluation for a shell-and-tube heat exchanger of unconventional energy-consuming equipment is the basis of system optimization, is one of the development trends of energy saving and consumption reduction, and is also the main target of research under the recent 'double-carbon' policy. The energy efficiency is short for energy utilization efficiency. The energy efficiency Index (ENERGY EFFICIENCY Index, EEI for short) is used for monitoring and calculating the energy utilization efficiency of the energy consumption equipment or the energy consumption of the energy consumption equipment in a certain time. Electromagnetic heaters are becoming increasingly popular as an efficient, energy-efficient and emerging heating technology for industrial and domestic applications. However, due to the lack of accurate energy efficiency monitoring and assessment methods, it is difficult for oil and gas field operators to accurately grasp the actual operating efficiency of these devices, and thus, targeted energy saving measures cannot be effectively taken, which undoubtedly aggravates the waste of energy. Disclosure of Invention The invention relates to a calculation method for evaluating the energy efficiency of an electromagnetic heater, which provides important theoretical basis and practical guidance for optimizing the energy efficiency and managing the energy consumption of the electromagnetic heater. The technical scheme adopted by the invention is as follows: the method adds the influence of heat absorbed by a medium, stray magnetic fields in a system, environmental heat dissipation, a control system outside the system and a machine room cooling power consumption factor on the efficiency of the electromagnetic heater, and constructs the following energy efficiency evaluation calculation method: in the formula, The correction coefficient of the electric energy is used for considering the control system, the pressure drop consumption and the cooling consumption of the machine room in actual application; The heat obtained by the electromagnetic heater, namely the heat absorbed by the medium, is kJ/h; kJ/h for the electric energy consumed by the electromagnetic heater, G is mass flow, kg/h, C is the average mass specific heat capacity of the heating medium between t 1 and t 2, k/(kg DEG C), t 1 is the heating medium inlet temperature DEG C, t 2 is the heating medium outlet temperature DEG C; is the consumed electric energy, kw.h. Aiming at the condition that the existing electromagnetic heater energy efficiency evaluation technology is still in a blank state at home and abroad, the invention has the following beneficial effects: Firstly, most electromagnetic heaters use the utilization rate of electric energy as an energy efficiency evaluation index, and the energy efficiency monitoring mode is simple and easy to realize, but the energy efficiency evaluation mode is not fully considered. The related technology of energy efficiency monitoring and evaluation of electromagnetic heaters used in oil and gas fields is still blank, and when the energy loss of the electromagnetic heaters is studied, the influence of factors such as stray magnetic fields in a system, environmental heat dissipation, a control system outside the system, cooling of a machine room, consumption of electric energy and the like on the efficiency of the electromagnetic heaters is studied under the condition of electric energy utilization rate. Secondly, the invention comprehensively analyzes the quality and quantity of energy from the