低温吸收塔的制造技术

介绍了09MnNiDR制大型低温吸收塔的关键制造技术。     

Calculations of the tritium re-emission rate in the DEMO first wall

The deuterium and tritium re-emission fluxes from the first wall (FW) of the DEMO reactor have been calculated. The influence of temperature of the first wall (FW), surface conditions, and trapping in neutron-produced defects on the tritium re-emission rate has been considered.     

09CuPCrNi耐候钢CCT曲线的测定及组织研究

用膨胀法测定了09CuPCrNi耐候钢的连续冷却转变动力学曲线（CCT曲线），并用金相显微镜观察了转变产物，用维氏硬度计测试各冷却速度下试样的硬度。研究了冷却速度对该钢组织及硬度的影响。结果表明在相当大的冷却速度范围内，可获得稳定体积百分含量的细片状珠光体加铁素体组织。     

Modification of thermo-elasto-viscoplastic model for soft rock and its application to THM analysis of heating tests

In deep geological disposal for high level radioactive waste, one of the most important factors is to study the thermo-hydraulic-mechanical (THM) behavior of the natural barrier, usually a host rock, during the heat process and hydraulic environment change. In this paper, a thermo-elasto-viscoplastic model proposed by Zhang and Zhang (2009) is firstly modified by adopting the t_ij concept (Nakai and Mihara, 1984) so that the influence of intermediate stress can be properly considered. The performance of the modified model is confirmed with drained triaxial compression tests and creep tests on soft sedimentary rock and manmade soft rock under different temperatures. Based on the modified model, a program called ‘SOFT’, using the finite element method (FEM) and the finite difference method (FDM) in the soil–water–heat coupling problem, has been developed to simulate the aforementioned THM behavior of geological materials. In order to verify the applicability of the program, an isotropic element heating test for soft rock under drained condition with different initial overconsolidation ratio (OCR), is firstly simulated by the proposed THM FE-FD program. In the test, the thermal volumetric change was found to be dependent on OCR. The simulated results show that the THM phenomenon observed in the laboratory test can be explained by the proposed numerical method. Meanwhile, a real-scale field heating test reported by Gens et al. (2007) is also simulated by the same THM FE-FD program. The material parameters of the rock involved in the constitutive model are determined based on the element tests for the rock in the laboratory. It is shown that the simulated results agreed well with the test results such as the time change of the temperature, the excess pore water pressure (EPWP) and the heat-induced strain.     

四川盆地中国石化探区天然气勘探开发领域与技术攻关方向

四川盆地中国石化探区天然气勘探开发成果显著,自新场气田发现以来,勘探开发领域逐步扩大,储量和产量快速增长。地质理论认识深化与关键技术进步是推动天然气勘探开发大发展的主要动力。中国石化探区天然气资源丰富,有利目标类型多,常规天然气整体探明程度为16%,页岩气勘探尚处于初期阶段,根据HCZ模式预测,中国石化探区天然气（含页岩气）勘探开发仍将快速发展,具备年均新增探明天然气地质储量(1 600~2 000)×10⁸ m³的潜力。围绕页岩气、海相碳酸盐岩天然气、陆相致密砂岩气等领域的高效勘探开发,需要加强深层海相页岩气增产降本的钻完井、压裂技术攻关,以及陆相、海陆过渡相页岩气资源潜力评价和勘探开发适应性技术准备,加强深层超深层礁滩相碳酸盐岩储层、风化壳储层预测和超深井高效钻井、压裂测试技术攻关,加强陆相致密砂岩气地质—测井—地震一体化甜点预测和低成本直井多层压裂技术攻关。     

09MnNiDR球罐用全位置焊条W707DRQ的焊接性能

09MnNiDR在国内某MTO装置中应用于低温乙烯球罐。结合球罐的建造特点,成功研制了09MnNiDR球罐全位置焊用W707DRQ焊条,并对其焊接接头进行系列试验。在较大焊接线能量下,焊接工艺性能较佳,焊接接头力学性能优良,确保了球罐焊接质量。分析W707DRQ焊条特性,研究焊缝金属低裂纹敏感性及焊接线能量对焊接接头低温冲击吸收能的影响,为将来建造高参数的球罐提供了较好的参考。     

A Tight Lower Bound for a Special Case of Quadratic 0–1 Programming

We consider a still NP-complete partial case of the unconstrained binary quadratic optimization problem that can be described in terms of an undirected graph with red edges having negative weights and green edges having positive weights. The maximum vertex degree of the graph is three. It can be assumed w.l.o.g. that every vertex is incident to a red and a green edge. We are looking for a vertex cover with respect to the red edges which covers a subset of green edges of total weight as small as possible. We prove that for all connected such graphs except a subclass of special graphs having exactly five green edges it is possible to find a vertex cover with respect to the red edges for which the total weight of uncovered green edges is at least 1/4 fraction of the total weight of all green edges.     

Simulation of hot-rolled dual-phase weathering steel 09CuPCrNi

The continuous cooling transformation diagram of deformed austenite for steel 09CuPCrNi was constructed by means of a combined method of dilatometry and metallography. The diagram exhibits an elongated polygonal ferrite C-curve with a delayed pearlite start and a metastable austenite gap between the polygonal ferrite and pearlite regions and between the ferrite and bainite regions. For this experimental steel, it is possible to obtain a dual-phase microstructure directly by hot rolling and appropriate cooling. Based on the diagram, the technical process of a hot-rolled dual-phase treatment was established and simulated using a thermal simulation testing machine. Dual-phase microstructures were obtained that show some bainite phase and are characterized by an irregular distribution of island-shaped martensite in a matrix of equiaxed ferrite grains. The morphology of the martensite phase is essentially of the lath type, with small areas of micro-twins appearing.     

采用VOD工艺冶炼泵壳用钢Z3CN20-09M

详细介绍了用VOD工艺冶炼Z3CN20-09M钢的过程。最终产品的含碳量为0.028%,Cr的回收率达83.5%。