With regard to the problem of the functional failure ocurred in the heat-stora ge roaster for a steel ladle caused by such factors as frequent damaging of the heat accumulator and too much maintenance for the commutator system, the new type of roaster for steel ladle in pure oxygen was designed, whose pure oxygen combustion-supporting roasting burner could achieve the slow rising in temperature starting from low temperature domain and fast roasting in high temperature. So the new-developed roaster was in operation reliably and smoothly, which could improve the roasting efficiency, and thus the energy saving rate for the equipment was more than 40%, while NO x emissions and carbon emissions also reduced greatly.

A three-dimensional steady-state CFD model of an industrial Kalugin hot stove was established and used to predict flow, temperature and concentration fields in dome combustion chamber of the hot stove during combustion period. According to the model predicted variation in temperature of the flue gas entering the regenerator with the operation parameters, appropriate operation conditions were obtained in terms of air consumption coefficient in the range of 1.0–1.3 for a constant combustion air flowrate of 65,000 Nm3/h, which can maintain the temperature of the flue gas entering the regenerator at 1297–1327℃. According to the statistics on measured data from ten consecutive combustion cycles of the industrial Kalugin hot stove, when the air consumption coefficient was increased from 0.79 to 1.27, on average the hot air temperature was increased by 32℃ while the cumulative fuel gas consumption was decreased by 14%.

To enhance the temperature uniformity and NOx reduction performance of the gas-fired radiant tubes, we proposed a new multi-stage dispersed burner based on fuel-staging combustion technology in this study. The effect of fuel nozzle structural parameters, including secondary fuel nozzle distance, D, (30 mm, 50 mm, 70 mm), secondary fuel nozzle diameter, ds, (2-6 mm), and tertiary fuel nozzle diameter, dt, (2.5 mm, 5 mm, 7.5 mm, 10 mm) on the flow field, temperature distribution, NOx generation and thermal efficiency were analyzed by numerical simulations. The results show that the multi-stage dispersed fuel nozzle could slow down the combustion rate and form a low oxygen dilution zone in the reaction process, reducing the maximum combustion temperature and NOx emission. With the increase of the secondary fuel nozzle distance, the NOx concentration at the outlet decreased from 69.0 ppm to 54.6 ppm, and a decrease of 20.9%. When the secondary fuel nozzle diameter increased from 2-6 mm, the maximum wall temperature difference gradually increased 72.8-76.3 K. The NOx emission at the outlet first decreased, then increased, and was as low as 45.6 ppm at a 5 mm diameter. Furthermore, increasing the tertiary fuel nozzle diameter could reduce the maximum wall temperature difference and NOx emission, and improve thermal efficiency. When dt = 7.5 mm, the overall performance of the radiant tube was the best, and the outlet NOx concentration, wall temperature difference and thermal efficiency were 46.1 ppm, 73.0 K, 63.7%, respectively.

In this paper, based on the structural characteristics of the double-P radiation tube, a novel type of flat double-P radiant tube was designed to improve the heating uniformity of the radiator tube and the heating efficiency of the workpiece. A new three-dimensional computational fluid dynamics modeling of the flat double-P radiant tube was conducted to discuss the heat transfer and combustion phenomenon. The influences of air and gas flow rate, air oxygen content, air consumption coefficient and air preheating temperature on flue gas circulation, surface temperature distribution and radiation power of the flat double-P radiant tube were analyzed and discussed, respectively. The amount of circulating flue gas, ratio of circulating flue gas, surface temperature non-uniformity coefficient, surface temperature distribution and radiation power of the flat double-P radiant tube with different sizes and positions of the burner nozzle characteristics were also studied in depth. The results showed that the fuel speed should be control between 40 m/s and 60 m/s. When the distance between the air nozzle and the fuel nozzle was 50 mm, or the position of the nozzles was 0 mm, the temperature non-uniformity coefficient was the lowest, which were both 0.058.

In this study, based on the structural characteristics of the traditional W-type radiation tube, a novel W-type radiant tube (N-WRT) with a flue gas circulation structure was developed to improve the heating uniformity of the radiator tube and the heating efficiency of the workpiece. New three-dimensional computational fluid dynamics modeling of the N-WRT was conducted to assess the heat transfer and combustion phenomena. In addition, the effects of nozzle diameter, nozzle location, and circulating tube diameter (all of which affect the main performance of the N-WRT) on the gas flow, temperature distribution, and nitrogen oxide (NOx) emission were analyzed and discussed in detail. Moreover, the amount of heat transfer, ratio of circulating flue gas, surface temperature distribution, thermal efficiency, and NOx concentration of the N-WRT based on different nozzle characteristics were compared. The results showed that the circulation ratio of flue gas increased from 0.47 at D60 mm to 2.2 at D28 mm. The NOx emission decreased most significantly from 100 ppm at D60 mm to 40 ppm at D50 mm. When the circulating tube diameter changed from 180 to 120 mm, the gas velocity at the junction decreased by 12%.

对CCPP和纯烧高炉煤气锅炉发电机组的技术工艺特征及优缺点进行了详细地对比分析,建立了两种电力的产品能值和成本的计算模型.以某钢铁企业为例,对两种发电机组的产品经济性进行计算,提出了钢铁企业富余煤气发电技术的指导原则,为钢铁企业消纳富余煤气在选择发电方式等方面提供了有益的参考.

The temperature uniformity on radiant tube wall was effected by its combustion process.It is studied by the thermal simulation method.The result indicated that fullness degree of smoke in radiant tube was higher,the concentrated of high temperature region was diluted,NOx formation descended,convection heat transfer strengthened,and the tube wall temperature changes from 114~141℃.

The effects of the bottom blowing modes and gas quantity on mixing time and deslagging area of molten steel are studied through using water model experiments. The results show that the mixing time is shorted and the deslagging area is reduced by using the double-hole bottom blowing mode in ladle,provide the support for using the bottom blowing mode properly and controlling gas-flow rate of ladle as well as efficently reducing the hot metallic inclusions and slag entrapment in production process.

The process of combustion and fluid flow and heat transfer in regenerative ladle baking was simulated using ANSYS CFX 10.0 software.The distribution of temperature and the gas flow field was provided.The effect on the temperature of ladle baking and the radiation intensity of flame by the different preheated temperature of air was analyzed.The calculated results indicate that the high-temperature air combustion technology is propitious to increase the temperature and the temperature uniformity of ladle baking.

ANSYS serial softwares are applied to numerically simulate and calculate the flow field on different casting speeds and enhanced cubage according to the slab continuous casting tundish in Angang.The water model and the particle image velocimeter system(PIV) are used to measure the flow field in the tundish and the results are consistent with the numerical simulation ones.

Based on energy saving and combined with continuous prodcreative practice of metallurgical mill,the advantages and disadvantages about regenerative combustion technology are analyzed.The method of preserving preheat section and flue gases heat exchanger,using only preheated air and increasing the amount of required regenerator unit air is offered.The security and reliability of regenerative equipment is assured.

Aim at the question that the changes of the strip size influnced transitional product mechanical properties,thermal course in rapid cooling section of annealing furnace and the changes of parameters about furnace were analyzed,reasonable cortrol parameters were offered.

Based on the technical demand during strip steel is annealed for hot galvanizing,this paper analyzes the mechanism producing the non-oxidized atmosphere and influence on furnace atmosphere because of changing gas ingredient in production course in a furnace.The reasonale control way of technical parameter of the direct flame burner is put forward in preheating zone.

According to the experiments,the effects of coating paint on regenerator are analyzed,and the effects of temperature on infrared coating paint.It was found optimum range of temperature.

通过对现场生产调试情况的跟踪及有关参数的测定,对蓄热式燃烧技术在推钢式加热炉生产调试中所出现的蓄热体寿命短、烧嘴冒火等问题进行了分析.

根据蓄热烧嘴热工特性,对轧钢加热炉采用蜂窝蓄热烧嘴中出现的一些问题进行了分析,总结出合理的蓄热烧嘴的结构、蓄热体尺寸、预热气体流量、烧嘴换向时间等热工参数,提出蜂窝蓄热烧嘴在实际设计中应注意的几个方面,使其发挥更好的换热效果.

介绍了热镀锌退火炉的组成及退火工艺过程,从退火炉各段的温度、气氛对镀锌层粘附性的影响方面对退火炉热工工艺进行了分析.

在实验室采用电炉对高碳钢加热过程进行模拟试验,分析加热温度、加热时间、炉内气氛等因素对其脱碳特性的影响,为加热炉加热工艺提供依据.

The experiment is conducted with hot stat e simulation to study the heat exchange of honeycomb regenerative burner.After analysis of experimental data,a result has been obtained that the heat ex change characteristics is related with the flow of air and the time of switch ing as well as configuration of temperature in heat exchange chamber,etc.At last,some main parameters are determined that the optimum time of switchin g,proper flow of regenerator per volume and suitable length of regenerati ve chamber.