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111.
A mathematical model is presented to describe the fluiddynamics processes for the combustion system of 410t/h Pyroflow CFB boiler.A core annulus structure with solid dispersion from core to annulus is considered,and the influence of coal particles fragmentation,attrition and broad size distribution of feeding coal and bed inventory on hydrodynamics is specially taken into account.The simulation results show that the CFB boiler has good hydrodnamic characteristics and high hot cyclone efficiency. 相似文献
112.
多孔高分子载体固定化微生物厌氧流化床处理低浓度废水的研究 总被引:14,自引:0,他引:14
本文报道用厌氧流化床反应器处理低浓度有机废水的可行性研究结果。采用多孔高分子载体固定厌氧微生物和流态化技术强化传质过程,可克服低浓度有机废水甲烷化能力低的障碍。实验表明,在35±1℃条件下,处理COD浓度为1600mg/L的人工葡萄糖废水,床层最优膨胀率为50%,容积有机负荷率为19.2gCOD/(L·d),COD去除率达70%;处理COD浓度为220~250mg/L的城市污水,容积有机负荷率为2.4~2.6gCOD/(L·d),COD去除率为54%~56%。 相似文献
113.
刘忠翰 《农业环境科学学报》1999,18(1):14
通过直接建造在鱼塘内的芦苇碎石床处理城市污水后,再抽鱼塘底层水回流到芦苇碎石床上进行再处理的试验研究表明,这种处理可使鱼塘水质达到卫生养鱼的水质标准。这一回用技术是安全可行的,有较好的经济效益。 相似文献
114.
The nitrifying activity of the filter bed of aquaria was monitored in hypersaline conditions. Salinity was raised in 5 ppt steps from normal sea water to 126 ppt in a course of 35 and 41 days. Twenty grey mullet fry (Chelon labrosus and Mugil cephalus) were used in two 53 l aquaria. Daily monitoring of total ammonia–nitrogen (TAN), nitrite, nitrate ions, and pH was performed. After an initial peak of TAN (0.65 mg/l), total ammonia stabilized at safe low levels (0–0.2 mg/l). Nitrite exhibited more peaks at levels of about 10 mg/l, lasted for 3–8 days but they also subsided to almost zero afterwards. Nitrate finally stabilized at levels around 100 mg/l. The water was alkaline, with pH fluctuating in the region of 8.2–8.8. These findings indicate that the filter bed may be effectively conditioned for hypersalinity and that fish may be safely maintained in the aquaria. 相似文献
115.
Three different commercially available structural plastic media were evaluated in triplicate in moving bed biofilters under low salinity (11–12 ppt) warm water culture conditions and two different feed loading rates. The culture system consisted of nine separate modules that include a double drain fish culture tank paired to a moving bed biofilter. The biofilters were filled with 0.11 m3 of one of three different types of floating plastic structured media. The three types of media evaluated were K1 kaldnes media, MB3 media, and AMB media. Volumetric total ammonia nitrogen (TAN) removal rates (g TAN removed/m3 media-day), TAN removal efficiency, and biofilm kinetic constants, Ki (h−1) were determined for the three media types at two different daily feed load rates of 3.5 and 8.2 kg feed/m3 media. The feed provided was a 4.8 mm slow sinking marine grower diet pellet (45% protein, 17% fat). Average (±standard deviation, SD) volumetric TAN removal rates (VTR) at the lower feed load for the three media types were 92.2 ± 26.3, 86.1 ± 27.5, and 82.5 ± 25.9 for the MB3, AMB, and K1 kaldnes media, respectively. At the higher feed load the average VTR for the three media types was 186.4 ± 53.7, 172.9 ± 47.8, and 139.9 ± 38.9 for the MB3, AMB, and K1 kaldnes media, respectively. Influent TAN concentrations varied by the feed load rate and ranged from 0.55 to 0.93 mg/L and 0.83 to 1.87 mg/L for the low and higher feed loads, respectively. The percent TAN removal rates for the MB3 media was the highest of the three media types at both the low and high feed load rates averaging 12.3% and 14.4%, respectively. The MB3 media was selected for use in the moving bed biofilters because of the greater VTR and removal efficiency results for use in the 0.11 m3 moving bed biofilters of the hatchery recirculating aquaculture system. 相似文献
116.
117.
9R-60型揉碎机目前应用非常普遍,但因其功耗大、效率低等实际问题急需对其结构参数进行优化设计。为此,在现有机型的基础上,设计并搭建了一个长、宽、高分别为718、712、687 mm的9R-60型揉碎机试验台。经过强度校核,设计了连接主轴等关键零件,在传动主轴和皮带轮之间通过联轴器、连接主轴和支架等接入JN 3 3 8-AN系列直连式扭矩转速传感器,为后续开展功率、揉碎质量等目标参数优化设计的单因素(如转子转速、秸秆喂入速度和喂入量等因素)正交试验和振动测试试验提供了平台。对揉碎机进行单因素试验表明:揉碎机揉碎质量随主轴转速的增大呈现增大的趋势,随喂入速度的增大呈现减小的趋势,随喂入量(不超过机器本身最大喂入量)的增大秸秆丝化率变化趋势几乎都在95%左右;揉碎机功耗随主轴转速、喂入量、喂入速度的增加呈现增大的趋势。 相似文献
118.
旋转导向管新型喷动床空气动力学特性研究 总被引:2,自引:2,他引:0
为放大常规喷动床,提出了“旋转导向管喷动床”新概念,设计并安装了两种旋转导向管喷动床。以小麦为原料,测定了旋转导向管新型喷动床的空气动力学特性,包括不同导向管在相同导喷距下风速与床层压降关系、导喷距对风速与床层压降关系的影响和旋转导向管喷动床的循环量等性能。研究结果表明:采用旋转导向管后物料可洒布在整个床层截面上,因此可放大喷动床的直径;在喷动发生后,旋转导向管新型喷动床的床层压降与普通导向管喷动床的床层压降差异较小;导喷距影响最大床层压降,采用调节导向管安装高度的方法,可不考虑最大喷动压强,而根据正常喷动时的压降选用风机。 相似文献
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120.