苏州市生活垃圾焚烧发电厂炉渣热灼减率监测与分析

对2011年苏州市生活垃圾焚烧发电厂炉渣热灼减率监测数据进行统计分析,结合日常监管信息,评价了苏州市垃圾焚烧厂焚烧线的总体运行能力。通过数据分析反映5台炉的焚烧效率和运行情况,并对苏州市的生活垃圾焚烧运营、监管提出了建议。

千吨级超大型多物料炉的排渣研究分析

生活垃圾焚烧厂焚烧炉渣是指生活垃圾焚烧后从炉床直接排出的残渣,以及过热器和省煤器排出的灰渣[1]。炉渣率是指统计期内炉渣产生量占垃圾焚烧量的百分比(%),是判断垃圾减量化程度的重要依据,能直观入炉垃圾品质和炉排炉燃烧运行情况。影响炉渣率大小的主要因素有垃圾的热值、物理组份、垃圾焚烧量、热灼减率以及锅炉燃烧工况等。千吨级超大型多物料炉排炉由于进行多物料掺烧,相较于普通生活垃圾焚烧项目炉渣率高,炉渣率与多物料掺烧比例亦表现正相关;与吨垃圾入炉发电量表现出负相关。

气力喷吹平渣技术在金堂电厂渣仓的应用

针对金堂电厂渣仓内炉渣呈尖状堆积、渣仓容积利用率很低的问题,采用气力喷吹平渣技术对渣仓进行了改造,取得了良好效果。对于类似电厂,具有借鉴作用。

Hydrogen permeability of slags containing calcium fluoride

To investigate the hydrogen permeability of calcium fluoride used for electroslag remelting （ESR） process, ＂Gas-slag- metal＂ osmosis process under argon atmosphere saturated with water vapor at 318 K was used to study the hydrogen permeability of slag containing calcium fluoride. The results indicate that the conventional slag, consisting of 70% CaF2 and 30% A1203, has the lowest hydrogen permeability. A parameter EH was proposed for evaluation of the hydrogen permeability of slags containing calcium fluoride. The hydrogen permeability decreases with increasing EH to a certain extent. An appropriate choice of slag for the ESR process can be obtained. These results also suggest that the hydrogen pick-up in steel after remelting might be reduced when a slag with low hydrogen permeability is used.

Recovery of iron from lead-zinc metallurgical slags by bath smelting

The recovery of iron from iron sinking slag and lead smelter slag was investigated by desulfurization-reduction bath smelting. The effects of lead smelter slag(LSS) to iron sinking slag(ISS) mass ratio and temperature were investigated in desulfurization experiments. The X-ray diffraction(XRD) and X-ray fluorescence(XRF) analyses show that the optimum conditions are LSS:ISS of 3:7 and temperature of 1350°C. The composition of desulfurization products is mainly Zn Fe2O4, and the desulfurization rate of 99.66% is obtained under optimum conditions. The thermogravimetric(TG) and differential scanning calorimeter(DSC) analyses demonstrate that reductant is necessary for decomposition and reduction of zinc ferrite in desulfurization product. The effects of reductant, temperature and feeding modes on iron enrichment were investigated in reduction experiments. The scanning electron microscope(SEM) and energy dispersive spectrometer(EDS) determination show that the iron content of reduction product is up to 99.36% under optimum conditions of coke as reductant, reduction temperature of 1450°C and the feeding mode of premixing.

Smelting chlorination method applied to removal of copper from copper slags

In order to reasonably utilize the iron resources of copper slags, the smelting chlorination process was used to remove copper from copper slags. Higher holding temperature and O2 flow rate are beneficial to increasing copper removal rate. However,the Cu2O mode is formed by the reaction of surplus O2 and CuCl with O2 flow rate increasing over 0.4 L/min, causing CuCl volatilization rate and copper removal rate to decrease. The resulting copper removal rate of 84.34% is obtained under the optimum conditions of holding temperature of 1573 K, residence time of 10 min, Ca Cl2 addition amount of 0.1(mass ratio of CaCl2 and the copper slag) and oxygen flow rate of 0.4 L/min. The efficient removal of copper from copper slags through chlorination is feasible.

垃圾焚烧发电厂性能试验方法研究

结合近年来垃圾焚烧发电厂性能试验的经验,介绍了垃圾焚烧发电厂性能验收试验的试验项目、测试技术及方法,并重点对烟气流量、炉渣热灼减率、焚烧炉-余热锅炉效率及垃圾低位热值的计算测量方法进行了论述。