Research On Waste Heat Recovery Method Of Heavy Forgings And Thermal Efifciency

Waste heat resources exist everywhere in industry, especially in the iron and steelindustry production process, there are plenty of waste heat resources, so it is one of the maintasks for company’s energy-saving to make full use of waste heat resources. China’s industrialwaste heat recovery rate is only33.5%,2/3of the waste heat have not been used. In the fieldof industry a large amount of energy are consumed, finally they are discharged with the formof low temperature hot water、waste gas. In order to improve energy utilization efficiency,measures should be taken for waste heat recovery and utilization.The average of forging annual production is more than2000tons in Guangzhou ShipyardInternational Company from2006to2008three years, the production capacity of forgingamounts to4000tons. according to the company’s survey, the next three years, SouthernChina marine forgings will be in a stage of rapid development, by2012, the existing marketdemand will increas e one times. If we consider the Guangzhou diesel engine project amountof forgings, demand for forging will reach9600tons in2013. A lot of energy are consumedduring production of forging, if use the heat from forging waste heat recovery for forging heattreatment or preheating reuse, we will greatly save energy, save considerable cost.Forging waste heat recovery has many kinds of method, the existing studies show that,using a variety of forms to preheat the air preheater can save fuel consumption10%-50%targets, but also far not reached the limit. Different forms of air preheater preheating effectdifference is very big, waste heat recovery and utilization rate is also different. Waste heatrecovery and utilization involve complex interfacial heat transfer problems, based on thepreheater and produced around the heat exchange medium and interface of the heat transfermodel is established, the preheater structure design, will achieve the best heat recoveryefficiency.Aiming at Guangzhou Shipyard International Company in large forgings, in order torecover waste heat、increase the waste heat recovery heat efficiency, regenerative heatrecovery device was designed. Based on actual production environment, using the Flunetsoftware as the platform, with heat balance test data, using the numerical simulation method,the waste heat recovery device for experiment and computer simulation, optimization design,design a rational structure, excellent heat recovery effect and strong operability of the wasteheat recovery device model.In the waste heat recovery device on the basis of the study, exploring the effects ofthermal efficiency of basic factors, and studies the theoretical calculation method of thermalefficiency of waste heat recovery, direct to improve the thermal efficiency of the theory andpractice of guidance.