共查询到20条相似文献,搜索用时 93 毫秒
1.
2.
3.
4.
为提高钻井液振动筛的气、固、液分离能力,一种以振动筛形成的脉动真空与压缩空气注入相结合的固液分离钻井方法被提出,在此基础上出现了一种采用脉动进料边界的旋流器。为分析旋流器的气液分离性能,需要探究其脉动进料条件下的最佳气液分离效率及其影响参数。为此,采用Fluent对稳定、脉动进料状态下不同结构参数的旋流分离器进行流动模拟,通过UDF函数设置脉动进料边界,并分析效率曲线得到脉动进料状态下分离器的最优参数。结果表明,脉动进料状态下的流场可以较好地实现稳定;采用频率为0.4 Hz的正弦脉冲进料气液分离效率最高,可达85.5%;在脉动进料状态下,其脉动不连续性会导致流场湍动能变大,径向压力降梯度降低,切向速度峰值降低。 相似文献
5.
脉动燃烧器的稳定性是其应用的前提,其稳定性包括点火稳定性和运行稳定性。本文过对自行研制的Helmholtz型膜片阀式脉动燃烧器的稳定性进行研究。分析了影响脉动燃烧器点火稳定性的因素,提出提高点火稳定性的措施。对所设计脉动燃烧器最小熄火燃气流量即燃烧范围进行了研究。针对脉动燃烧器在空气中长时间燃烧容易熄火的现象做出了分析,认为高温时影响脉动燃烧不稳定的主要因素,并通过对实验结果的分析得出了熄火原因和解决方案。 相似文献
6.
7.
8.
9.
10.
文章介绍了高温蒸汽灭菌的工作原理和高温蒸汽灭菌器的结构组成,简述了高温灭菌的工艺流程。按照工艺要求和设计规范,对高温蒸汽灭菌器进行了设计和校核计算,并根据实际使用情况,对高温蒸汽灭菌器进行了结构优化。 相似文献
11.
Manuel Feurhuber Marino Magno Marco Miranda Ren Prieler Christoph Hochenauer 《化学,工程师,技术》2019,91(4):502-513
Steam sterilization processes rely on high heat transfer rates from the steam to the medical devices. To guarantee this, all non‐condensable gases (NCGs) must be removed from the steam sterilizer before sterilization. The ratios and distribution of the NCGs in the pre‐sterilization phases of both a vacuum and a non‐vacuum steam sterilizer are investigated. Two CFD models for simulation of the NCGs in the sterilizers were developed and validated by the measurements of a pressure sensor and eight thermocouples inside the steam sterilizer. Furthermore, a novel method was developed to calculate the real ratio of NCGs based on the standard measurement (EN 13060). The results show that the NCGs ratio defined in the EN 13060 did not accurately represent the real ratios of the NCGs. 相似文献
12.
低温等离子体的生物学效应包括对微生物的致死作用和对动物细胞的刺激作用,分别造就了一批灭菌技术和临床医药技术。本文介绍了等离子体灭菌技术在医疗器械、水和空气净化、食品和包装材料处理等方面的应用。其中已商业化的医疗器械灭菌器主要分低气压和常压两种,低气压等离子体灭菌器的灭菌体积较大,常压等离子体灭菌器的优点则是结构简单和便于操作。等离子体灭菌技术用于水、空气、食品等领域由于能耗、效率、化学残留等问题尚未商业化。在医药技术方面,近十年来开发的等离子体技术和装备成功运用于龋齿、皮肤、伤口、癌症等的处理,部分已进入临床应用。将来的研究重点在于明确等离子体与细胞之间的相互作用机理,并开发出更高效、实用的用于各相关行业的等离子体技术和装备。 相似文献
13.
14.
The performance of the Taylor‐Couette flow apparatus as a heat sterilizer is numerically investigated. The destruction of Clostridium botulinum and thiamine (vitamin B1) was selected as model reaction. When Taylor vortices were formed in the annular space, the heat transfer significantly enhanced as compared to the case without vortex flow. As a result, the equivalent lethality calculated from the temperature field increased, which is regarded as a quantum leap. Conversely, the improvement of heat transfer induced destruction of thiamine. These results suggest that there is a trade‐off relationship between the enhancement of heat transfer and the avoidance of thermal destruction of nutritional components. In conclusion, the Taylor‐Couette flow sterilizer has the potential for process intensification in heat sterilization processes. 相似文献
15.
16.
目的验证葡萄糖注射液的灭菌工艺。方法通过对灭菌柜空载热分布实验、满载热分布实验和生物指示剂试验进行验证同时考察产品无菌状态以及主成分的变化。结果灭菌柜能够提供预定的灭菌条件,葡萄糖注射液经过灭菌操作后无菌检查合格,且其主成分改变很少。结论葡萄糖注射液通过灭菌验证。 相似文献
17.
应用HACH-01型多功能加热器及随该仪器的HACH试样消解反应管,在125℃下加热30 min完成消解。此方法使用的消解反应管具螺旋口盖,密封简单、快速、可靠,并且该加热器加热到要求温度所花费的时间比医用灭菌器短,因而整个分析过程时间大大缩短,操作过程简单安全,准确度和精密度均达到或超过国家标准方法。 相似文献
18.
19.
S.H. Lin 《Chemical engineering science》1976,31(1):77-82
The continuous high-temperature/short-time sterilization of liquid foods is investigated. A steam-injection, which is frequently used in industrial sterilization processes, is considered. The non-Newtonian power-law model is employed to characterize the liquid food flow and an energy balance to calculate the temperature distribution in the cooling section. Well-established kinetics is adopted to model the microorganism (Cl. botulinum) destruction and nutrient (vitamin B12) denaturation. The total length of sterilizer is determined for different sterility requirements, process temperatures and pseudoplastic indices. 相似文献
20.
针对以氯气为主要杀菌剂的系统,存在正磷升高、局部介质温度较高的换热器形成磷酸钙垢等问题进行了研究,在循环水处理配方中引入了耐氯分解能力强、分散能力好的缓蚀阻垢成分,筛选出代号为Fu-93A(P)的缓蚀阻垢剂,经生产应用,腐蚀速率达到0.0222mm/a,粘附速率达到2.64mcm,水中正磷长期维持在1.0mg/L以下。 相似文献