10results about How to "Control oxygen content" patented technology

The invention discloses a method for preparing titanium-aluminum alloy powder based on a plasma rotating electrode atomization method, and relates to a preparation method of titanium-aluminum alloy powder. The method aims at solving the technical problems that titanium-aluminum alloy powder prepared through an existing method is uneven in particle size, poor in sphericity degree and high in oxygen content, and comprises the steps that firstly, metal raw materials are weighed according to the target titanium-aluminum alloy chemical component proportion, and a uniform cast ingot is obtained through smelting of a vacuum arc smelting furnace; processing the cast ingot into an electrode bar with a smooth surface, mounting the electrode bar on plasma rotating electrode atomization equipment, enabling the electrode bar to rotate at a high speed, melting alloy at the end part of the electrode bar by utilizing a plasma beam generated by a plasma generator, atomizing the alloy into liquid drops under the action of centrifugal force, and cooling and solidifying the liquid drops in a high-purity argon protection atmosphere to form powder; and finally, the powder is collected and screened, finished powder is obtained, the sphericity degree of the powder reaches 95% or above, the oxygen content is lower than 500 ppm, particle size distribution is uniform, and the powder can be used in the fields of aerospace, the automobile industry, energy and the like.

This application provides a liquid air supply system for breathing air, comprising: a liquid air storage tank, a high-pressure vaporization pump, a high-pressure vaporizer, a nitrogen input module, a buffer mixing module, an oxygen content detection module, and a control terminal; the high-pressure vaporization pump has a liquid inlet and a liquid outlet; the buffer mixing module has an air inlet and an air outlet; the liquid inlet of the high-pressure vaporization pump is connected to the liquid air storage tank, and the liquid outlet is connected to the high-pressure vaporizer; both the high-pressure vaporizer and the nitrogen input module are connected to the air inlet of the buffer mixing module, and the air outlet of the buffer mixing module is used to connect to the main gas supply pipe; the gas detection module detects the input gas data and output gas data of the buffer mixing module, and the control terminal controls the amount of nitrogen input from the nitrogen input module to the buffer mixing module based on the input gas data and the output gas data, enabling the safe and long-term output of air with the required oxygen content.

The application provides a low-sulfur and low-phosphorus high-manganese submerged arc welding wire steel and a preparation method thereof, and the chemical components of the steel are as follows in terms of percentage by weight: C 0.07%-0.11%, Si≤0.10%, Mn 1.30%-1.50%, P≤0.012%, S≤0.008%, Mo 0.50%-0.65%, Ni 0.15%-0.25%, Cu≤0.10%, Al≤0.008%, O≤0.0040%, N≤0.0050%, and the rest is iron and inevitable impurities. The application adopts a production mode of '120t converter+LF furnace refining+small billet continuous casting+heating furnace heating+controlled rolling and controlled cooling rolling+heat preservation channel', and solves the problem of difficult oxygen control in the process of the low-silicon variety of the low-sulfur and low-phosphorus high-manganese submerged arc welding wire steel. The application not only guarantees the mechanical property requirements of the low-sulfur and low-phosphorus high-manganese submerged arc welding wire steel rod, but also has good drawing performance and welding performance.

The present invention belongs to the technical field of back contact batteries, and specifically relates to a back contact battery with improved contact characteristics, a preparation method and an application thereof, wherein at least a portion of the surface layer of a transparent conductive film layer is doped with a metal material to form a doped region, and the average doping concentration of the metal material in the doped region is 1e18cm ‑3 ‑5e22cm ‑3 , the proportion of oxygen vacancies in the transparent conductive film layer to the total oxygen atoms contained is 5%-60%, and doping regions are respectively set on the transparent conductive film layers that the N-type region metal electrode and the P-type region metal electrode contact respectively. The present invention can well match semiconductors with different polarities on the back side, improve the contact characteristics between the metal electrode and the transparent conductive film layer, the transparent conductive film layer and the semiconductor layer, enhance the conductivity of the transparent conductive film layer, reduce the resistivity of the transparent conductive film layer, and reflect the effect of reducing the overall resistance from the macroscopic measurement, thereby improving the battery efficiency.

The corrugated plate type SCR denitration catalyst calcining system comprises a furnace chamber, and the furnace chamber is divided into an upper flow guide cavity on the upper side, a lower flow guide cavity on the lower side and a middle calcining cavity; the device further comprises a circulating fan and a circulating pipeline, the circulating fan is installed in the upper flow guide cavity, a first end and a second end are formed at the two ends of the circulating pipeline respectively, the first end communicates with the circulating fan, the second end communicates with the lower flow guide cavity, and the circulating fan is used for supplying air from the first end to the second end. A heating module is mounted at the middle section of the circulating pipeline; the energy-saving and environment-friendly stove further comprises a fresh air fan, the fresh air fan is connected with a fresh air pipeline, and the fresh air pipeline can introduce fresh air into the stove cavity through the fresh air fan. The furnace further comprises an exhaust fan, and the exhaust fan is communicated with the furnace cavity through an exhaust pipeline and used for exhausting air in the furnace cavity. In the calcining process, catalytic active components are fully thermally decomposed and activated, and the denitration performance of the product is improved.

This invention discloses a method for preparing oxygen-free copper, relating to the field of metallurgical technology, comprising the following steps: Step S1, raw material pretreatment; Step S2, gradient melting and deoxidation; Step S3, gradient refining; Step S4, directional solidification casting; Step S5, heat treatment. The oxygen-free copper prepared by this method exhibits good mechanical properties, excellent electrical conductivity and heat resistance, and low oxygen content.

The invention provides a high-strength, high-conductivity and high-temperature-resistant graphene aluminum conductor and a preparation method thereof, and belongs to the technical field of metal conductors. Aluminum powder, graphene and rare earth particles are evenly mixed to obtain composite powder, the composite powder is prepared into a graphene-aluminum composite wire blank through continuous extrusion, large-deformation multi-pass cold drawing is conducted on the wire blank, graphene can be evenly dispersed in the grain boundary of an aluminum matrix, grains are refined, and the graphene-aluminum composite wire blank is obtained. The tensile strength and the conductivity of the graphene aluminum conductor are improved; by adding the rare earth particles, the oxygen content in the aluminum matrix can be controlled, so that the conductivity of the graphene aluminum conductor is improved. The result of the embodiment shows that the method provided by the invention is low in energy consumption, continuous large-scale production can be realized, and the obtained graphene aluminum conductor has the characteristics of high strength, high conductivity and high temperature resistance.

The present invention discloses a device and method for pyrolyzing urban organic waste to produce high-grade hydrogen-rich synthesis gas, and specifically relates to the technical field of urban waste treatment. The device comprises a reaction tower with two upper and lower moving beds. The upper moving bed adopts an oxygen-deficient environment, which can ensure that the heteroatoms contained in the product of the pre-oxidation section are effectively escaped; the temperature and oxygen content are increased in the carbonization section of the lower moving bed, and the appropriate ratio of carbon / oxygen / steam is controlled at the same time, so that the hydrogen content of the hydrogen-rich high-grade synthesis gas can reach more than 99%. After the domestic organic waste is treated by the device and method of the present invention, on the one hand, it can be ensured that N, O, S, and Cl after dissociation all escape from the reactor as their hydrogen-containing compounds NH3, CO2 (H2CO3), H2S, and HCl gases, and can be completely removed when entering the deacidification tower, and no longer appear in the form of their oxides; on the other hand, after being treated by the two-step method, the obtained hydrogen-rich high-grade synthesis gas contains almost no non-flammable nitrogen, which greatly improves the utilization value of cracked combustible gas.

The embodiment of the application provides a kind of oven and its control method, it is related to oven technical field, for the preservation of food material in cooking process, to improve the taste of dish.The oven includes: oven body, with the inner cavity of opening;Oxygen sensor, for detecting the oxygen content of air in the inner cavity;Gas separation system, for extracting air in the inner cavity;The oxygen filtration treatment of air extracted;The filtered oxygen after air is recharged into the inner cavity;Controller is configured to: receive the starting instruction of low-oxygen cooking mode;In response to the starting instruction of low-oxygen cooking mode, the oxygen content of air in the inner cavity is obtained by oxygen sensor;When the oxygen content of air in the inner cavity is greater than the first oxygen content threshold, control gas separation system to work, so that the oxygen content of air in the inner cavity is reduced to the first oxygen content threshold.

The utility model belongs to the field of edible mushroom cultivation, and provides an edible mushroom fruiting controller which comprises a lantern ring, the lantern ring is hollow, a limiting ring is arranged on the outer wall of the lantern ring and fixedly connected with the lantern ring, threads are symmetrically arranged at the top end and the bottom end of the outer wall of the lantern ring, and the top of the lantern ring is in threaded connection with a top cover; the edible mushroom packaging bag is simple in structure, convenient to operate and use and good in sealing effect, the oxygen content in the packaging bag can be effectively controlled by controlling the top cover 3, and mushroom farmers can adjust the fruiting time of edible mushrooms according to temperature changes so as to adjust the marketing time of mushrooms.