Ethylene Energy Optimization Management System Design And Implementation

Ethylene is one of the main products of petrochemical industry, production of ethylene leukotriene (ethylene, propylene, butadiene) and BTX (benzene, toluene, xylene) is the basic material for the petrochemical industry, petrochemical ethylene as the leading device, the energy consumption level is a measure of a country's level of development of petrochemical industry an important symbol.With the national energy saving policy of gradually advancing and deepening, the domestic petrochemical enterprises are facing more and more severe competition and challenge. As China western the biggest oil refining chemical enterprise, in recent years, Lanzhou Petrochemical relying on technological innovation, strengthen energy conservation management, the energy conservation work has made considerable progress, but compared with the international advanced level, a large gap still exists. In the petroleum chemical industry, energy consumption of ethylene plant is one of the main device. According to the 2007 Lanzhou Petrochemical Company power production data statistics, energy consumption of ethylene plant of the entire company 22.49% of the total energy consumption, the energy saving in ethylene plant of the company total energy consumption decline has important significance。The energy conservation work includes not only technical improvement, energy management is a very important content. Through technology improvement can achieve the purpose of energy saving, in a certain period of time so that the energy consumption decreased significantly. However, with the extension of time and the changes in technology, energy-saving results are often difficult to maintain. Based on years of experience in energy saving, 6-12 months later, energy consumption will increase. In order to maintain energy saving results, need to develop and Practice on energy management system ( EMS ), in order to solve daily operation efficiency and energy saving effect of preserving problems。EMS is a structured management process combined with a system monitoring tool, real-time data with device connected to the system, through the operation of the error corrected, continue to reduce plant energy costs. EMS is the core of KPI (Key Performance Indication) evaluation system, KPI that key performance indicators, through the production unit within the production process of energy-using equipment, input, output, the key parameters set, sampling, calculation, analysis, used to measure the efficiency of a target type, to quantify the energy management indicators. Comprehensive historical operational data, database data and the evaluation of the theoretical calculation of energy consumption data, at different levels to control the KPI targets set as the target value of each level. Comparison between target and actual values of the gap, to quantify the energy loss, the formation of the report or alarm reminder of managers, engineers and operators for processing. Each KPI has a key associated factors, through the different levels of KPI tracking can identify key areas of energy loss caused by key factors can be analyzed to track the formation of the reason. At present, research on energy management system, the main focus of the power industry, refining industry has not yet formed proprietary software products.Main research contents: to rely on the system for the latest energy-saving policies, energy-saving technology, energy saving and energy-saving targets of basic information, the expert system for the latest energy-saving strategies; of key production equipment used to heat furnace, furnace, large units and pipelines Real-time monitoring and alarming, for operation, maintenance, and provide the basis for assessment; system based on utility data, process variables, and economic constraints, the establishment of public works-line model, including the establishment of steam, hydrogen, electricity, fuel, water and nitrogen balance model of the working fluid ; to evaluate energy consumption from the previous month ex-post evaluation analysis into during and after evaluation of the combination of energy analysis to enable enterprises to adjust the control from the original into a pre-and post things to control, to promote the effectiveness of control effect; for public engineering system optimization, optimization by hand, into a system optimization, including the plan optimization and real-time optimization; system by year, month chart shows the statistical analysis of energy consumption, to analyze, evaluate and track energy consumption data; on the implementation of the optimization program optimization results for quantitative evaluation; on the transformation of energy efficiency measures tracked; system to provide an objective evaluation system for energy consumption.Lanzhou Petrochemical 460000 tons / year ethylene device based on EMS system research and development and practice, start in the round 460000 tons / year ethylene plant energy system optimization, analysis device can present situation, potential and optimization measures of energy use, use of internal and external aspects of technical personnel, expert experience, combining mathematical model and energy optimization tool technology platform, through the operation of improvement and technological innovation, improve energy system operation management level and the level of safety management, improve the energy production and use of evaluation system, to reduce energy consumption, improve the market competitiveness of the company has important significance.