4results about How to "Low additional cost" patented technology

The invention relates to the technical field of oil and gas fracturing flow-back fluid treatment, and particularly discloses a boron-doped diamond electrode electrooxidation system and method for treating fracturing flow-back fluid. According to the method for treating the fracturing flow-back fluid, before the fracturing flow-back fluid enters an electrooxidation unit, sulfide is efficiently removed, poison and competitive oxidation of the fracturing flow-back fluid to an electrode are eliminated, a BDD electrode is protected, a foaming agent is synchronously removed through aeration enrichment, the problem of foam interference in the flow-back fluid treatment process is fundamentally solved, and continuous and stable operation of a system is guaranteed; after the electro-oxidation unit, active chlorine (pypocholoride / chlorine) is effectively removed and recycled, so that waste is treated by waste, the oxidation efficiency is improved, and the dosage of chemicals is reduced. Through the collaborative design, the interference and foam problems of sulfide with high chloride ion content and strong reducibility are collaboratively optimized, and the treatment efficiency, economical efficiency and stability of the system are integrally improved.

This invention provides a gradient magnetic biochar, its preparation method, and its applications, belonging to the field of solid waste resource utilization and anaerobic fermentation technology. Through a synergistic modification strategy of gradient alkaline thermal activation and atmosphere-controlled co-precipitation, this invention significantly improves the electron transport efficiency and catalytic activity against chain-elongating microorganisms, thereby efficiently promoting the directed synthesis of medium-chain carboxylic acids at low doses. This not only improves fermentation performance but also significantly reduces the cost of addition, providing an innovative solution for low-carbon and efficient treatment of livestock and poultry manure and a substantial increase in the yield of high-value-added medium-chain carboxylic acids. It has significant practical application value and broad industrialization prospects.

The application provides a nanoparticle reinforced low-cost aluminum alloy melt-resistant die steel and a preparation method thereof. The preparation method comprises the following steps: mixing titanium aluminum powder, B4C powder and C powder to obtain a mixture 1, and coating the mixture 1 into a wire A by using pure aluminum strip; mixing the wire A with pure aluminum liquid after heating, and casting and rolling to obtain an intermediate alloy wire B coated with aluminum-coated TiC+TiB2 ceramic nanoparticles after mechanical stirring and ultrasonic treatment; batching, heating raw materials to complete melting to obtain a molten die steel liquid; adding the wire B into the molten steel liquid, and obtaining the nanoparticle reinforced low-cost aluminum alloy melt-resistant die steel after vacuum degassing, casting, electroslag remelting, high-temperature diffusion, forging, annealing, quenching and tempering. The nanoparticle reinforced low-cost aluminum alloy melt-resistant die steel prepared by the application can be immersed in molten aluminum alloy at 740-760 DEG C, and the erosion weight loss rate of the die steel obtained by the application is 32-48 mg / cm 2 , and the average thickness of the intermetallic compound layer is less than or equal to 159 µm.

The utility model provides an octagonal tube main shaft purline fixing structure for a photovoltaic support, which comprises an octagonal tube main shaft, an adapter which is positioned on the upper side of the octagonal tube main shaft and is used for mounting a purline, and a connecting assembly which is used for tightly holding and mounting the adapter on the octagonal tube main shaft, the plane section is parallel to the upper plane of the octagonal tube spindle, the transition section extends downwards from the two ends of the plane section and is used for preventing the plane section from being attached to the upper plane of the octagonal tube spindle so as to avoid over-constraint of the octagonal tube spindle, and the inclined plane section extends downwards from the transition section in an inclined mode and is completely attached to the inclined plane of the octagonal tube spindle. Only the inclined surfaces of the adapter seat and the U-shaped bolt and the inclined surfaces of the adapter seat and the lower hoop are attached to the inclined surface of the octagonal tube main shaft, so that the over-constraint phenomenon caused by mutual competition when the inclined surfaces and the planes are attached is effectively avoided.