共查询到20条相似文献,搜索用时 109 毫秒
1.
2.
针对油田注汽锅炉工况不能自动调节的问题,开发了油田注汽锅炉烟气含氧量自动控制系统,排烟中含氧量和鼓风压力,转换成电信号送到控制器,自动控制鼓风机转速,使排烟含氧量控制在2.5%左右,锅炉始终运行在最佳工况,效益显著。 相似文献
3.
顾永强 《中国锅炉压力容器安全》2009,(4):41-42
孤东油田九区注汽站G101、G102湿蒸汽发生器(也称注汽锅炉)近2年发生8根炉管鼓包、爆管等安全事故,影响注汽开发的正常进行。实践经验表明,火焰偏烧是造成炉管局部过热导致鼓包、爆管的根本原因。锅炉爆管已成为制约注汽安全生产的瓶颈问题。锅炉炉管鼓包、爆管在油田注汽锅炉中非常普遍,据初步统计,全国油田热采行业因锅炉爆管每年造成的经济损失上千万元。因此,解决油田注汽锅炉爆管的问题成为注汽热采行业亟待解决的问题。 相似文献
4.
本文对稠油油田注汽锅炉余热利用潜能进行了分析,探讨了回收烟气余热的必要性。对注汽锅炉烟气余热回收方式进行了研究,提出了注汽锅炉烟气余热回收的方案。经现场实施和测试,分析证实了注汽锅炉烟气余热回收的效果。 相似文献
5.
6.
提高蒸汽注汽品质和优化保温层厚度是改善地面蒸汽管线热力输运、实现稠油高效开采的关键。建立了油田地面蒸汽管线热力参数计算模型和保温层厚度经济性分析模型,基于分段微元方法求解沿程蒸汽干度、热损等特性参数,分析了锅炉出口蒸汽参数和注汽流量的影响规律,并结合经济厚度法的计算原理优化了保温层厚度。结果表明:提高锅炉出口蒸汽温度和压力,沿程蒸汽干度降低速度变快,沿程热损增加变快,与锅炉出口蒸汽温度313 oC,压力10.2 MPa相比,其热损最大增加11.15%;增加注汽流量,蒸汽干度提升且随管线沿程降幅缩小,等梯度注汽流量差下,高注汽流量时蒸汽干度降幅较小,其降幅为3.58%;经济厚度为0.33m时,其热损费用同比原有厚度可降低68.22%。 相似文献
8.
9.
根据油田注汽锅炉热平衡测算数据及结果分析,找出了其运行热效率低的原因。影响注汽锅炉运行热效率的主要因素是排烟温度和空气系数,测算分析表明,大部分注汽锅炉二者均超标。根据注汽锅炉特点提出了提高运行热效率的技术措施,即空气系数调节技术、化学清烟垢技术和烟气余热回收技术。工程应用表明,节能及经济效益显著。 相似文献
10.
11.
12.
针对核电站蒸汽发生器水位控制的非线性分布特点,在自抗扰控制技术的基础上结合多模型控制提出了蒸汽发生器水位系统新的控制方案.在该控制方案中,对蒸汽发生器设计了多模型控制系统,并针对各个模型分别设计了不同负荷下的自抗扰控制器,可以对扩张状态进行在线实时估计,因此设计的扰动补偿不依赖于模型便能够达到快速消去扰动的效果.将该方法用于蒸汽发生器水位控制系统进行仿真研究,结果表明:该控制方案实现了对蒸汽发生器水位良好的动态控制,具有较强的鲁棒性和抗干扰能力,且算法简单,便于调试. 相似文献
13.
This study shows that the main features of a steam generator can be determined based on the method of constructal design. The generator is endowed with freedom to morph, and then is optimized by putting the right components in the right places. The number of steam tubes is sufficiently large, so that the steam generator may be modeled as continuous. The total volume of the assembly and the volume of the steam tubes are fixed. The geometry is free to vary in the search for maximum heat transfer density. The steam flow in the tubes is modeled in two ways: single‐phase and two‐phase fully developed turbulent flow. Results of the analysis are: the location of the flow reversal (i.e. the demarcation between the tubes of the downcomer and those of the riser), the optimal spacing between adjacent tubes, and the number of tubes for the downcomer and the riser. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
14.
A thermal-hydraulic model of a once-through subcritical steam generator has been developed for predicting dynamic characteristics of solar thermal power plants as well as for control system design. The purpose of the model is to evaluate the overall system performance and component interaction with sufficient accuracy for controller design, rather than to describe the microscopic details occurring within the steam generator.The three-section (compressed water, two-phase mixture, and superheated steam) model with time-varying phase boundaries is described by a set of nonlinear differential equations derived from conservation of mass, momentum and energy. Local stability of the model has been examined at different levels of insolation. Transient response of six plant variables due to independent step disturbances in three input variables are presented as typical results. 相似文献
15.
16.
文章分析了蒸汽安全阀校验装置的结构以及校验方法的优劣,证明蒸汽用安全阀采用蒸汽介质校验比采用常温氮气等校验更接近实际工况,校验结果准确可靠。通过研究高效非电内加热式小型蒸汽发生器,构建中小型高温安全阎校验装置,并利用饱和蒸汽进行安全阀的模拟高温工况来对上述方法进行验证。 相似文献
17.
Bin Zheng Yingkai Shen Peng Sun Ruixiang Liu Jian Meng Runze Chang Tengfei Gao Yongqi Liu 《International Journal of Hydrogen Energy》2021,46(34):18064-18072
Hydrogen production by bio-oil steam reforming is an advanced production technology. It is a good method of coupling waste heat utilization with bio-oil steam reforming to produce hydrogen, which increases the cleaning ability of the bio-oil steam reforming system. A multi-zone steam generator using waste heat has been proposed, which can produce the heat source and steam source of the hydrogen system. The DEM model of the multi-zone steam generator was set up. The model has been used to investigate the effects of particle sizes (40 mm–80 mm). With increasing particle size, the flow index and the flow uniformity gradually decrease, the vertical velocity gradient increases in the area on both side with the zone steam generator, and the vertical velocity fluctuation amplitude gradually increases. So, the hydrogen production decreases from the particle size increasing. 相似文献
18.
19.
20.
《International Journal of Hydrogen Energy》2023,48(30):11162-11170
With the massive consumption of fossil fuels and it resulted in significant carbon emissions, it is urgent to find an alternative clean energy source. Hydrogen has been regarded as one of the most promising energy candidates for the next generation. It is a great approach that methane steam reforming for hydrogen production by rational utilization of industrial waste heat, which significantly minimizes carbon emissions and develops methanol steam reforming technology. A solid particle steam generator based on the primary heat exchange method has been proposed, which can provide the heat and steam in the methanol steam reforming hydrogen production system. The quasi-two-dimensional packing heat transfer model of solid particles steam generator was set up.The effect of distance change between the vacancy and the cold wall and distance change between vacancies on heat transfer performance of the steam generator and hydrogen production capacity were studied. As the distance between the vacancy and the wall increases, the heat transfer performance of the steam generator gradually deteriorates, so the steam production of the steam generator decreases, and the system's hydrogen production capacity is reduced, the maximum of the heat flux and the minimum of the apparent thermal resistance are 34.67 kW/m2 and 12.02 K/W, respectively. As the distance between vacancies increases, the heat transfer performance of the steam generator is gradually optimized slightly. To maintain the hydrogen production capacity, vacancies should be avoided to appear 2 layers of particles away from the heat exchange wall in the particles steam generator. From the results of the study, the farther the distance between vacancies, the better the steam production and hydrogen production capacity. 相似文献