5results about How to "Control oxygen content" patented technology

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 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 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.