4results about How to "Improve economic competitiveness" patented technology

The application relates to the technical field of tunnel construction, and discloses a combined segment structure, which comprises a UHPC segment and concrete test blocks, a plurality of concrete test blocks are arranged on the outer side surface of the UHPC segment in sequence along the curvature direction of the UHPC segment, the UHPC segment is provided with main reinforcement and stirrups, the main reinforcement is provided with a plurality of strips along the curvature direction of the UHPC segment, a plurality of stirrups are sequentially sleeved on the plurality of main reinforcement and are connected with the main reinforcement through binding, the concrete test blocks are provided with transverse steel bars and longitudinal steel bars, the transverse steel bars extend to the outside of the concrete test blocks and are overlapped with the stirrups, and the longitudinal steel bars extend to the outside of the concrete test blocks and are overlapped with the main reinforcement. Compared with the prior art, the structure design realizes optimal control of material cost by filling the concrete test blocks in the non-key stress area under the premise of hardly sacrificing the core performance of UHPC materials such as strength, durability and stress condition, and effectively eliminates the core economic obstacle in the popularization process of the UHPC shield segment.

The application relates to the hydrogen energy preparation technical field, in particular to a methanol cracking hydrogen production carbon process and system, the methanol cracking hydrogen production carbon process comprises the following steps: a, preparing methanol gas; b, methanol cracking is carried out through a catalyst system: under an argon atmosphere, the catalyst system is heated to a predetermined temperature, the methanol gas is introduced, and methanol cracking hydrogen production carbon is carried out; the catalyst system comprises an alloy catalyst and a modified metal oxide catalyst; c, product collection: collecting hydrogen and carbon material obtained by cracking. The application provides a methanol cracking hydrogen production carbon process and system, so as to solve the problems of insufficient catalyst activity and selectivity, large reactor energy consumption and high investment.

This invention relates to a manganese-cerium composite oxide catalyst, its preparation method, and its application in the catalytic oxidation of tetrahydrofuran to γ-butyrolactone, belonging to the field of hydrogen energy utilization and chemical hydrogen storage technology. Using a manganese-cerium composite oxide catalyst (manganese-based oxide) as the catalyst, tetrahydrofuran is selectively oxidized to γ-butyrolactone in the presence of an oxidant. It can be used for the resource-based conversion of byproduct tetrahydrofuran in a γ-butyrolactone / 1,4-butanediol liquid organic hydrogen storage cycle system, achieving closed-loop recycling of materials. Compared with existing technologies, the manganese-based catalytic system of this invention has advantages such as wide availability of raw materials, low cost, mild reaction conditions, and high product selectivity. It can effectively reduce the adverse effects of tetrahydrofuran accumulation on the system's economy during multiple hydrogen storage cycles, and has good prospects for industrial application.

The invention relates to the technical field of functional rubber, in particular to a high-weather-resistance rubber balance block and a preparation method thereof. The high-weather-resistance rubber balance block is prepared from the following components in parts by weight: 65 to 75 parts of ethylene propylene diene monomer (EPDM), 25 to 35 parts of natural rubber (NR), 5.0 to 6.5 parts of zinc stearate, 1.5 to 2.5 parts of anti-aging agent, 0.8 to 1.0 part of sulfur, 0.3 to 0.9 part of accelerant, 1.0 to 1.5 parts of alkylphenol disulfide, 5 to 10 parts of plasticizer, 40 to 60 parts of filler and 2 to 4 parts of composite siloxane coupling agent. The composite siloxane coupling agent is prepared from 3-butene triethoxy silane, bicyclo [2.2. 1]-5-heptylene-2-yl triethoxy silane, and bis-[3-(triethoxy silicon) propyl]-tetrasulfide. The rubber balance block prepared by the invention has excellent ozone aging cracking resistance, and does not crack in an aging test for 48 hours under the ozone concentration of 200PPHM.