Temperature and Thermal Stress Analysis of Refractory Products

Firstly current status of temperature and thermal stress research of refractory product at home and aboard are analyzed. Finite element model of two classical refractory products is building by using APDL language. Distribution law of temperature and thermal stress of two typical refractory products-ladles and tundish are analyzed and their structures are optimized. Stress of optimal structure is dropped obviously, and operation life is increased effectively

Influence Factors on Temperature Distribution of Electric Furnace Roof

Electric furnace roof is an important device for electric steel making, whose heat preservation performance and life-span have a direct impact on the economic benefits of iron and steel enterprise. This paper investigates the effect between the temperature level of electric furnace roof and the material parameters. Research indicates that they have a trend to change in the same direction

Coke Oven Intelligent Integrated Control System

In order to improve the level of management and control of coke oven, the research on intelligent integrated control system is carried out. In modern advanced control system of coke oven, the control scheme of feedback combined with feed-forward, and control merged with management are widely utilized. The integrated management and control system of coke oven is introduced systematically, including the system model, production plan and management, heating control system, the model and method of evaluating temperature, intelligent combustion control and the pressure control gas collector of coke oven. It is pointed out that the integration of management and control develops towards the orientation of coke oven control system. Considering the complexity and importance of flue temperature control in coke oven heating process, the control method of combining the stopping heating time control with the heating gas flow adjustment is proposed, hybrid intelligent control models of flue temperature are buil

Intelligent Control of Air Compressor Production Process

The air compressor provides not only the required pressure air for the cooling equipment and refrigeration plant, but also the raw material required for the air separation plant. Utilizing the air compressor is extremely extensive in many significant departments such as the metallurgy, oil and chemical industry. The air compressor production process is a time-varying, delay and nonlinear complex system and gas consumption in the industrial field is irregular. Defects in the traditional control method lead to the pressure instability of the compressed air outputted from the air compressor in volatile gas-consumption situations, sometimes a wide range of fluctuation arising. Therefore, the working state of the air compressor becomes unstable. It results in both a waste of resources and greater energy consumption. Therefore, guaranteeing the output pressure of the air compressor system steady is extraordinarily significant for improving efficiency and saving energy for the overall air separation system. DCS control technology applied to the system, the ECS-700 system of SUPCON was utilized into configuring the air compressor system and monitoring real-time values of important parameters in the various components. According to the working characteristics of the air compressor system, a fuzzy pressure controller and an intelligent control method based on the fuzzy PID were proposed. The simulation results showed that the control effect was extraordinarily satisfactory and effective. It can offer a certain meaning of guidance and reference for the control of other equipment in air separation system

Simulation of Expansion Joint of Bottom Lining in Ladle and Its Influence on Thermal Stress

Ladle is an important equipment of the metallurgical industry. Distribution of thermal stress in bottom linings has an essential influence on its life, and the size of its life-span affects the economic benefits of the iron and steel enterprise directly. In the process of design and calibration of the large-size ladle, it is of great significance to determine the stress distribution of each part of the ladle for safely and reliably running the device. Expansion joint has an important effect on the thermal stress of ladle composite construction body. The thermal expansion stress is one of important reasons that lead to damage, so it is of great practical value to calculate the thermal expansion stress. Expansion joint question between the inside linings could be summed up as a kind of contact question, whose physical model was set up, and the finite element model of expansion joint of bottom lining in ladle was built. The contact stress of expansion joint in each layer was researched. The results illustrate that setting 2 millimeters expansion joint can reduce the contact stress which is equate to 1/6 ~ 1/5 of crushing strength of the lining

Stress Distribution Model of Prefabricate Block Electric Furnace Roof

The furnace cover is an important equipment of electric arc furnace steelmaking, the thermal insulation performance and service life directly affects the economic benefits of iron and steel enterprises. Considering the contact between the precast block, this paper establish the CAD/CAE model of high aluminum brick furnace cover and a precast furnace cover (casting three block, eight block, twelve block) , based on heat transfer theory apply the finite element software ANSYS analyzes the stress field of steady state about high aluminum brick furnace cover and a precast block furnace cover in the last stage of melting, which facilitates the analysis of the stress level and distribution of furnace cover, provides the theory support for the production and promotion of precast block furnace cover

Research on Temperature Distribution Model of Electric Furnace Roof

Electric furnace roof is an important device for electric steel making, whose heat preservation performance and life-span have a direct impact on the economic benefits of iron and steel enterprise. Considered contact behavior between prefabricate block, this paper establishes the complete CAD/CAE model of the electric furnace roof with finite element software based on the theory of transferring heating subject, and respectively calculates the stable temperature and stress field of the firebrick roof and the prefabricate block roof in last melting stage, as is advantageous to analyze the level and the distribution of temperature and stress of electric furnace roof

Univariate and multivariate Cox proportional hazards models showing variables that affect overall survival in patients with GEJ adenocarcinoma.

<p>HR hazard ratio, CI confidence interval.</p