688 results about "Partial pressure" patented technology

The invention relates to the technical field of sewage treatment, in particular to an aerobic aeration treatment system for plateau domestic sewage treatment, which comprises a pretreatment unit, a biological treatment unit, an advanced treatment unit and a recycling unit which are connected in sequence, the system further comprises a data acquisition module, an aerobic aeration intelligent regulation and control module, a biochemical environment constant-temperature maintenance module, a carbon-nitrogen proportion and backflow dynamic regulation and control module, a digital twinning and sludge characteristic simulation module and an energy collaborative scheduling module. Compared with the prior art which adopts a standard aeration strategy and cannot adapt to the special environment of low air pressure and low oxygen partial pressure of the plateau, the system can accurately adapt to the plateau environment by integrating real-time atmospheric pressure and water temperature monitoring, dynamically calculating the oxygen saturation solubility and correcting the aeration control target according to the oxygen saturation solubility, so that the aeration control target is optimized. Stable supply of dissolved oxygen required by biochemical reaction is ensured, and the technical bottleneck of low efficiency of traditional sewage treatment in plateau regions is fundamentally overcome.

The invention provides a vehicle-mounted oxygen production control method and device, a vehicle-mounted oxygen production system and electronic equipment, and relates to the technical field of vehicle control. The method comprises the steps that the oxygen partial pressure in a cockpit, the altitude of the environment where the cockpit is located and the oxyhemoglobin saturation of passengers in the cockpit are obtained; determining an oxygen supply demand value based on the oxygen partial pressure, the altitude and the oxyhemoglobin saturation; and based on the oxygen supply demand value, an oxygen generation module is controlled to start oxygen generation or stop oxygen generation. The starting and stopping of the oxygen generation module are controlled based on the oxygen supply demand value, waste caused by starting of the oxygen generation module when oxygen supply is not needed can be avoided, and therefore the energy consumption of vehicle-mounted oxygen generation can be greatly reduced.

The invention provides a method for selecting a high-concentration VOCs adsorbent at different temperatures and application, and belongs to the technical field of waste gas governing. According to the method, through testing pore structure parameters of a model adsorption material with concentrated pore size distribution, a static adsorption isotherm and a dynamic penetration curve for VOCs at different temperatures, a high-concentration VOCs adsorbent is obtained; a linear relation equation of the critical aperture and the critical pressure is established through linear fitting, then a correlation equation of the critical aperture, the temperature and the partial pressure is established, and the appropriate aperture distribution range and the model selection standard of the high-concentration VOCs adsorbent at different temperatures are determined by combining dynamic adsorption results. According to the method, the ternary matching relation equation of the VOCs partial pressure, the temperature and the critical aperture is constructed, accurate type selection of the high-concentration VOCs adsorbent at different temperatures is achieved, the pore volume utilization rate and the adsorption capacity can be improved, meanwhile, desorption energy consumption and the VOCs pyrolysis risk are reduced, and a theoretical basis is provided for adsorbent type selection and technical optimization.

The invention belongs to the technical field of preparation of hydrogen sulfide stress corrosion resistant oil well pipes, and relates to a 125ksi steel grade hydrogen sulfide stress corrosion resistant oil well pipe material suitable for a normal temperature environment containing 1MPa H2S and a preparation method of the 125ksi steel grade hydrogen sulfide stress corrosion resistant oil well pipe material. B, Ti, V and Nb elements are added, and the contents of Si, Mn and Ni elements, the Cr / Mo ratio and the sum of Nb, V and Ti in steel are controlled; the refined 100% sorbite structure, various compounds and microalloying are obtained through the processes of pure steel smelting, forging, controlled rolling and secondary heat treatment, so that high strength and high toughness in the 125 ksi range are obtained, and meanwhile the hydrogen sulfide corrosion resistance is high. The pipe product obtained by the process method disclosed by the invention has no corrosion cracking phenomenon after being subjected to a corrosion resistance test under the partial pressure of hydrogen sulfide of 1MPa.

The invention belongs to the technical field of oil-gas field development, and particularly relates to a method for testing the content of adsorbed gas in a coal bed gas diffusion process. The problem that the desorption degree of coal bed gas cannot be clearly known at present is solved. According to the technical scheme, high-temperature and high-pressure isothermal adsorption experiments under the condition of different gas proportions are carried out, methane adsorption-desorption capacity of mixed gas of different proportions under different partial pressures is determined, gas diffusion experiments are carried out to evaluate gas migration capacity in the diffusion process and methane gas partial pressure distribution in a sample, and different experiment results are synthesized to determine the methane gas content of the sample. The desorbed gas content in the coal bed gas diffusion process can be calculated; according to the new method, the proportion of the methane desorption gas amount in the coal bed gas development process can be calculated, and the desorption degree of the adsorbed gas of the coal bed reservoir is evaluated.

The present invention discloses a pyrolysis oil and gas cutting device and method, comprising a waste rubber pellet pyrolysis module, a pyrolysis oil and gas high-efficiency cutting module, a pyrolysis oil and gas condensation module, a Roots blower, a non-condensable gas pressure-stabilizing and conveying module, and a control module. By spraying cooling water and circulating non-condensable gas onto the high-temperature pyrolysis oil and gas, the present invention utilizes the vaporization of the cooling water to absorb a large amount of latent heat of phase change, fully condensing the high-temperature pyrolysis oil and gas. Furthermore, the generated water vapor and non-condensable gas reduce the partial pressure of low-flash-point components in the oil and gas, causing them to continuously migrate from the liquid phase to the gas phase. While ensuring that the oil product flash point meets standards, the minimum flash point cutting temperature required for condensation of high-flash-point oil is lowered, thereby increasing the yield of high-flash-point oil.

Flue gas is compressed to high pressures, which raises the partial pressure of carbon dioxide thus facilitating its absorption into physical solvents (e.g., water, salt solutions, methanol). When added onto an existing CO2-producing process, the compression is performed using multiple stages with intercooling. After the high-pressure carbon dioxide dissolves into the physical solvent, it flows through a series of pressure letdowns using turbines that allow the dissolved carbon dioxide to evolve from the solvent. Through a series of multiple compression stages, the evolved gas is compressed for transport, utilization, or storage. The flue gas that has been scrubbed of carbon dioxide flows through a series of expanders with interheating supplied from waste heat, or the heat of compression. The process is enhanced by employing alkalis that chemically react with acid gases, such as carbon dioxide. These same CO2-capture processes can be integrated into processes that produce shaft and / or electrical power.

The invention provides a cross-adsorption-temperature industrial organic waste gas adsorbent type selection method and application, two or more model adsorption materials with concentrated pore size distribution are used, and filling type adsorption with high pore volume utilization rate can be formed in pores with a specific size or below due to adsorption of volatile organic compounds (VOCs) on a porous material; and a matching relation equation between the filling type adsorption critical aperture and the adsorption partial pressure and a rule of changing along with the adsorption temperature are explored. According to the method, the partial pressure is normalized relative to the saturated vapor pressure at the respective adsorption temperature, and the parameter saturated vapor pressure related to the adsorption temperature is introduced into an equation as a variable, so that an equation of critical pore diameters suitable for adsorption of VOCs at different temperatures and concentrations is established; and a cross-adsorption-temperature industrial organic waste gas adsorbent type selection method is formed. The method provided by the invention can provide a quantitative reference basis for development of VOCs efficient adsorption materials and technologies suitable for different adsorption temperatures.

The utility model discloses a high-vacuum-degree micro-pressure-difference control device for desulfurization slurry grading flash evaporation heat recovery, and belongs to the technical field of coal-fired boiler waste heat heat supply. The system aims at solving the problems that when desulfurization slurry flash evaporation is adopted for boiler flue gas waste heat recovery, much non-condensable gas such as SO2 can escape due to heat release and condensation, the volume of a vacuum system is relatively large, and consequently the high vacuum degree is difficult to maintain by adopting a conventional vacuumizing device, a special micro-differential pressure vacuum pump is added, and the vacuum degree is reduced; extracting non-condensable gas on the liquid level of the condensed water of the last-stage heater, and sending the non-condensable gas to a front-mounted heater matched with the last-stage flash tank; when necessary, alkaline water can be sprayed to the space, where non-condensable gas is enriched, of the final-stage heater so as to comprehensively absorb SO2 and other components to reduce the partial pressure, so that the micro-differential pressure vacuum pump can stably maintain the high-vacuum state of the final-stage heater, the temperature of a concentrated slurry outlet of the final-stage flash tank is greatly reduced, and the concentration rate of the final-stage flash tank is increased. And optimal operation conditions are created for greatly reducing the exhaust gas temperature and greatly improving the waste heat recovery amount.

A method for manufacturing an active material, the method comprising the following steps:(1) mixing an activation agent containing one kind or two or more kinds of alkali metal compounds into an electrode mixture containing an active material and a binder;(2) heating a mixture thus obtained to a temperature higher than or equal to a melting start temperature of the activation agent in an atmosphere having an oxygen partial pressure of 0.3 atm or higher; and(3) collecting an active material from the mixture after heating.

The invention discloses a high-carbon ferro-chrome smelting control method based on a submerged arc furnace, and relates to the field of high-carbon ferro-chrome smelting control, and the high-carbon ferro-chrome smelting control method comprises the following steps: constructing a three-dimensional temperature measurement network, generating temperature field distribution in the furnace based on three-dimensional space coordinates of all temperature measurement points, and further extracting boundary position coordinates and volume change trend of a molten pool; the method comprises the following steps: performing matching degree calculation on an electrode position impedance gradient curve and a molten pool boundary change trend to diagnose the structural stability of a crucible area, calculating the partial pressure ratio of key components based on hearth pressure, and comprehensively diagnosing the overall health state grade of the furnace condition in the furnace in combination with the structural stability state of the crucible area in the furnace; according to the diagnosed overall health state grade of the furnace condition, the proportion of the chromium ore, the coke and the flux is dynamically adjusted, accurate sensing of the multi-dimensional state in the furnace and grading diagnosis of the furnace condition are achieved, the problems of insufficient reduction of raw materials, waste of the chromium ore and the like can be avoided in time, and the product purity and the smelting stability are guaranteed.

A process of forming a titania-silica glass body, the process including exposing a titania-doped silica soot body to a constant steam pressure step during which the partial steam pressure is at a first partial pressure of steam P1 that is from about 0 Torr to about 760 Torr and exposing the soot body to a ramp-up steam pressure step during which the partial steam pressure increases from the first partial pressure of steam P1 to a second partial pressure of steam P2, the second partial pressure of steam P2 being from about 50 Torr to about 760 Torr. The second partial pressure of steam P2 being greater than the first partial pressure of steam P1. The process further including heating the soot body during the constant steam pressure step and during the ramp-up steam pressure step and increasing the temperature during at least one of the constant steam pressure step and the ramp-up steam pressure step.

The invention provides a high-concentration volatile organic compound shallow cooling adsorption and desorption method based on filling type adsorption, and belongs to the technical field of waste gas treatment. According to the method, the pore structure parameters of a model adsorption material with concentrated pore size distribution and the static adsorption isotherm and dynamic penetration curve of VOCs at different temperatures are tested; a linear relation equation of critical aperture and critical pressure is established through fitting, a correlation equation of the critical aperture, temperature and partial pressure is constructed, dynamic adsorption capacity is calculated, and the low-temperature strengthening method suitable for dynamic adsorption is determined by combining a shallow cold adsorption and desorption strategy. According to the method, a ternary matching relation equation among VOCs partial pressure, adsorbent aperture and adsorption temperature is constructed, the critical aperture under a specific adsorption condition is calculated, a low-temperature enhanced VOCs shallow cold adsorption and desorption technology is developed, the desorption difficulty is reduced while the pore volume utilization rate and the adsorption capacity are improved, and a support is provided for adsorbent type selection and adsorption technology optimization.

The system comprises an absorption tower, a grading flash tank, a desorption tower, a buffer tank and an MVR (mechanical vapor recompression) compressor, a liquid outlet of the absorption tower is connected with the grading flash tank, a gas outlet of a first-stage flash cavity of the grading flash tank is connected with a carbon dioxide recovery unit, gas outlets of other flash cavities are connected with a gas inlet of the absorption tower, and a gas inlet of the absorption tower is connected with a gas outlet of the desorption tower. A liquid outlet of the grading flash tank is connected with a desorption tower, and a regenerated gas outlet of the desorption tower is connected with a buffer tank through an MVR compressor, so that regenerated gas is pressurized and then conveyed into the buffer tank; a gas outlet of the buffer tank is connected with the carbon dioxide recovery unit, and a steam outlet of the buffer tank is respectively connected with the grading flash tank and a reboiler of the desorption tower. The regeneration energy consumption can be reduced, and the equipment size can be reduced.

The present invention discloses a closed-loop EGR flow control system and control method for a natural gas engine. The control system includes: a controller for determining an EGR demand flow rate based on actual engine operating conditions; a controller for obtaining the pressure of an air and gas mixture detected by an intake pressure sensor; or, alternatively, for determining the pressure of an air and gas mixture based on the EGR demand flow rate, a threshold flow rate, the maximum opening of an EGR valve, the actual opening of the EGR valve, the gas flow rate, and the fresh air flow rate; a controller for determining an actual EGR flow rate based on the obtained pressure of the air and gas mixture, the partial pressure of gases in the cylinder, the pressure-to-flow conversion slope, the gas flow rate, and the fresh air flow rate; a controller for determining an EGR flow rate correction value based on the obtained actual EGR flow rate and the EGR demand flow rate; and a controller for adjusting the EGR valve opening based on the EGR flow rate correction value so that the actual EGR flow rate matches the EGR demand flow rate, thereby achieving closed-loop control of the EGR flow rate. The present invention can achieve precise control of the EGR flow rate in two ways.

A hydrogen gas sensor with a substrate and a zinc oxide nanostructured thin film deposited on the substrate, wherein the zinc oxide nanostructured thin film has a lattice structure with a weight ratio of low binding energy O2− ions to medium binding energy oxygen vacancies in a range of 0.1 to 1.0, and a method of fabricating a gas sensor by thermally oxidizing a metal thin film under low oxygen partial pressure. Various combinations of embodiments of the hydrogen gas sensor and the method of fabricating the gas sensor are provided.

The utility model discloses a gas-solid transmission reactor capable of being used for various in-situ spectrum characterization in a high-pressure environment, which comprises a reaction tank main body, and the rear end of the reaction tank main body is fixedly connected with a light window with a cooling channel; the rear end of the light window is fixedly connected with the front end of the reaction tank main body through fixing bolts, and the fixing bolts are positioned at four corners of the light window and the reaction tank main body. Through the design of the thickness and the diameter of the rubber gasket and the light window sheet and the use of the polytetrafluoroethylene compression ring on the outer side, higher pressure in the reaction tank can be ensured, the application range of the reactor is expanded, and the reactor can be used for in-situ research on the influence of partial pressure of the reactor on related catalysts and spectral characteristics; a gas inlet and a gas outlet on the reaction tank main body are controlled by a three-way valve and are externally connected with a gas control system capable of controlling flow, so that the pressure can be stably controlled, and the reaction control under dynamic or static conditions is realized.

The invention relates to a vehicle-mounted screw air compressor oil emulsification prevention method and system, a medium and a program product, and in the method, the running state parameters of a screw air compressor are monitored in real time, and a water vapor saturation pressure formula and a temperature and pressure coupling mathematical model are used for calculating saturation water vapor pressure and actual water vapor partial pressure respectively. When the actual water vapor partial pressure is larger than the saturated water vapor pressure force corrected by the safety coefficient, the system adjusts the oil way temperature control valve to reduce the lubricating oil flow of the oil cooler so as to increase the exhaust temperature. If the condensation risk still exists and the exhaust temperature does not reach the shutdown protection threshold value, the oil way temperature control valve continues to be adjusted; if the exhaust temperature reaches the shutdown protection threshold value, the actual water vapor partial pressure is reduced by reducing the rotating speed of the frequency converter. And after the condensation risk is eliminated, the current operation parameters are maintained. The method is used for reducing the possibility that water vapor reaches saturation in the compression system and liquid water is separated out, and the accuracy and stability of lubricating oil emulsification risk control of the air compressor under the variable load working condition are improved.

The invention discloses a method for improving stability of steel slag by regulating and controlling treatment atmosphere, which comprises the following steps: S1, crushing the steel slag until the particle size is less than or equal to 10mm, and wetting until the water content is 5-20%, S2, putting the steel slag treated in the step S1 into a closed container, injecting CO2 gas into the closed container until the CO2 gas reaches a preset partial pressure value, s3, injecting saturated water vapor into the closed container until the total pressure reaches a preset total pressure value, and forming wet and hot acidic wet and hot mixed gas by using the water vapor and CO2, and S4, after the total pressure of the closed container reaches the preset total pressure value, keeping for 2-12 hours under a constant pressure condition, and carrying out hydration and carbonization reaction on free calcium oxide and free magnesium oxide in the steel slag and the mixed gas to generate calcium carbonate and magnesium carbonate. According to the method, the dual effects of improving the stability of the steel slag and effectively fixing carbon can be achieved, comprehensive utilization of the steel slag in civil engineering is achieved, meanwhile, CO2 tail gas captured by a steel mill is utilized, carbon is effectively fixed, and carbon emission is reduced.

The invention discloses a numerical simulation method for oil product evaporation and oil gas concentration distribution prediction in a confined space, and belongs to the technical field of oil product evaporation simulation in the confined space, and the method specifically comprises the following steps: constructing an oil product evaporation multiphase flow model of the confined space; the Lee phase change model is improved through a user-defined function UDF, and the difference value between the vapor partial pressure and the saturated vapor pressure is dynamically calculated to trigger the evaporation process; performing CFD simulation on an oil and gas distribution rule in the confined space; performing comparison verification on the CFD simulation result and experimental data; and predicting the time-varying concentration gradient distribution rule of oil and gas in the limited space based on the Lee phase change model. According to the numerical simulation method for oil product evaporation and oil gas concentration distribution prediction in the limited space, the concentration gradient distribution rule of oil gas in the limited space can be accurately predicted, an important reference basis is provided for an oil product leakage emergency disposal strategy, and the prevention and control capacity and the emergency disposal efficiency of oil product leakage accidents can be improved.

The invention discloses a high-pressure amine absorption method carbon capture system and method coupled with liquefied air energy storage, and relates to the technical field of energy storage and carbon capture, the system comprises: an air compression unit used for compressing mixed gas of flue gas and air to generate high-pressure mixed gas, and detecting flow parameters of the mixed gas to generate high-pressure gas; the flue gas inlet amount and the high-pressure mixed gas flow are intelligently regulated and controlled; the heat conveying unit is used for conveying part of the high-pressure mixed gas and heat-conducting oil which are respectively used for carbon dioxide desorption and expansion power generation; and the absorption unit is used for introducing the high-pressure mixed gas from the top of the absorption tower, and absorbing carbon dioxide in the mixed gas by using an ethanolamine solution in the absorption tower to generate a rich solution. According to the invention, the air compression unit in the liquefied air energy storage system is utilized to pre-pressurize the flue gas to be subjected to carbon capture, increase the partial pressure of carbon dioxide, increase the solubility of carbon dioxide, increase the reaction rate of ethanol amine for absorbing carbon dioxide, increase the capture rate and reduce the dosage of ethanol amine solution.

The application discloses a method for constructing oxygen defect regulation of hafnium dioxide 5d track electron, comprising the following steps: S1, using a hydrothermal method, by regulating the oxygen partial pressure in the preparation process, preparing hafnium oxide nanocrystals with different oxygen defects and calculating the oxygen defect concentration; S2, according to the first principle, calculating and constructing a hafnium dioxide crystal model under a microstructure, and modifying the corresponding model according to the experimental results of step S1; S3, according to the hafnium dioxide with oxygen defects obtained in step S2, calculating the total state density and the partial state density of the near-oxygen vacancy end hafnium atom and the far-oxygen vacancy end hafnium atom, respectively, calculating the proportion of the d atom track, and establishing a method for regulating the hafnium dioxide 5d track electron.

The invention provides a sterile filling process control method and system for midazolam oral liquid nitrogen charging protection, and relates to the technical field of medicine filling process control. After midazolam oral liquid is subjected to nitrogen charging, a headspace gas multispectral image sequence in a bottle before sealing is collected through a transmission imaging system integrated with a filling line; extracting oxygen characteristic absorption wave band light intensity attenuation data through spectrum separation, and generating a bottleneck plane oxygen two-dimensional concentration diagram; calculating the local oxygen partial pressure of the pixel, and constructing a three-dimensional oxygen concentration field and marking an oxygen-enriched area by combining pre-stored geometric parameters of the bottle body; and then the model reference adaptive controller is used for comparing the model with an ideal nitrogen model to generate supplementary parameters containing purging angle, intensity and time, an execution mechanism is driven to perform fixed-point pulse purging, and after verification reaches the standard, a screw cap is used for sealing, so that accurate detection, directional processing and standard verification of the headspace oxygen-enriched area in the midazolam oral liquid bottle can be realized, and the safety of the midazolam oral liquid bottle is ensured. And the oxygen concentration before sealing meets the standard.

The invention discloses a zero-carbon method for strengthening coal seam gas recovery and CO2 storage by using flue gas residual heat in the technical field of residual heat utilization, gas extraction and carbon emission reduction. The zero-carbon method comprises the following steps: step 1, collecting high-temperature flue gas in a power plant; step 2, performing high-temperature CO2 concentration-compression; step 3, reservoir evaluation and area selection; 4, designing and constructing a horizontal well; 5, high-temperature CO2 injection and joint control energy increasing are conducted, specifically, high-temperature CO2 is injected into a preset section through a pump, the injection pressure and the injection speed are adjusted through the joint control energy increasing technology, and the diffusion range and the diffusion speed of CO2 are controlled; 4, gas recovery and CO2 storage: high-temperature CO2 is used for providing energy to promote gas desorption on one hand, and the high-temperature CO2 and CH4 in the adsorption state are subjected to competitive adsorption on the other hand. The method is simple and easy to operate, the coal seam gas partial pressure is reduced through CO2 injection, the recovery efficiency is improved, CO2 can be adsorbed by a coal seam and stored in a reservoir, and geological storage of CO2 is achieved.

The invention relates to core-shell structure ceramic powder as well as a preparation method and a preparation system thereof. According to the preparation method, a SiO2 core-containing suspension system is formed under stirring and heating conditions. And dropwise adding a pH regulator into the reaction cavity, guiding a reaction product of the ytterbium source solution and the silicon source solution to deposit and grow on the surface of the SiO2 core to form a core-shell structure precursor, and treating the core-shell structure precursor to obtain the core-shell structure ceramic powder comprising SiO2 (at) Yb2Si2O7. The material of the core of the core-shell structure ceramic powder is SiO2, the material of the shell is Yb2Si2O7, and the SiO2 core is used as a built-in silicon source library, so that the in-situ self-compensation function of the material in a high-temperature environment is realized, the stability of Yb2Si2O7 is ensured, and the problem of irreversible deoxidization decomposition of a Yb2Si2O7 phase can be avoided when the ceramic powder serves in an extreme environment with high temperature, high pressure and high water oxygen partial pressure for a long time.

The invention discloses a high-stability hydrated covalent organic framework membrane which comprises an ionic covalent organic framework and a self-supporting flexible substrate and is prepared by a vacuum-assisted self-assembly method, the thickness of the membrane is less than 100nm, and the pore size of the membrane is 2 + / -0.2 nm; the covalent organic framework is a nanosheet formed by polymerizing an aldehyde monomer 1, 3, 5-triformyl phloroglucinol and an amino monomer 4, 4 '-diamino-3. 3'-biphenyl disulfonic acid through a phase transfer method. According to the application of the membrane in natural gas decarburization, the membrane is applied to a wet natural gas purification system, has high flux and high selectivity in a CO2 / CH4 separation process, can tolerate multi-component conditions such as H2S, heavy hydrocarbons (C2H6, C3H8, n-C4H10, n-C6H14 and the like) and pressure as high as 33 bar, also has excellent separation performance on H2S / CH4, and has excellent separation performance in saturated steam of C6H14, C7H8 and C8H10 (hexane partial pressure is greater than or equal to 20 kPa). And the membrane separation performance is not obviously changed.

A stopping method for a separation device is a stopping method for a separation device, which is to be performed after a dehydration step using a separation membrane, the separation device including the separation membrane, the stopping method including: placing the separation membrane under an environment A in which a water vapor partial pressure P(H2O) and a saturation water vapor pressure Psat(H2O) satisfy a relationship of [P(H2O) / Psat(H2O)≥0.001] and a temperature is 100° C. or higher; and decreasing a temperature of the environment A.

A hydrogen gas sensor with a substrate and a zinc oxide nanostructured thin film deposited on the substrate, wherein the zinc oxide nanostructured thin film has a lattice structure with a weight ratio of low binding energy O2− ions to medium binding energy oxygen vacancies in a range of 0.1 to 1.0, and a method of fabricating a gas sensor by thermally oxidizing a metal thin film under low oxygen partial pressure. Various combinations of embodiments of the hydrogen gas sensor and the method of fabricating the gas sensor are provided.

The invention provides a production method for improving the yield of an ADC foaming agent, which comprises the following steps: fully mixing urea and hydrazine hydrate in a premixing tank according to the mass ratio of (2.4-3.5): 1 to obtain a premixed solution; continuously adding the premixed solution into the condensation reaction kettle, dropwise adding concentrated hydrochloric acid with the concentration of more than 31% until the pH value of the materials in the condensation reaction kettle is 2.0-3.0, heating the materials in the condensation reaction kettle to 90-110 DEG C, and carrying out condensation reaction; adjusting the gas phase ammonia partial pressure in the condensation reaction kettle according to the progress of the condensation reaction; when the concentration of hydrazine hydrate in the condensation reaction kettle is lower than 1g / L, stopping the condensation reaction, carrying out solid-liquid separation and washing on materials in the condensation reaction kettle to obtain a biurea solid, and carrying out an oxidation process on the biurea solid to obtain the ADC foaming agent. According to the production method for improving the yield of the ADC foaming agent, the self-condensation reaction of urea can be effectively inhibited, and the yield of the ADC foaming agent is improved.

The invention discloses a method for stepwise dissolution of copper, selenium and tellurium in copper anode slime and enrichment of precious metals, the method comprises the steps of ball milling and drying, pressure leaching, oxygen pressure conversion and alkaline leaching, in the pressure leaching process, the oxygen partial pressure in a sulfuric acid solution with the concentration of 10-30 g / L is controlled to be 0.05-0.2 MPa at the temperature of 100-120 DEG C, NaCl and HCl are added in the oxygen pressure conversion to improve the Se recovery rate, and the alkaline leaching is carried out at the temperature of 100-120 DEG C; na2S is added in alkaline leaching, so that the tellurium recovery rate is remarkably improved, and the copper-selenium-tellurium leaching efficiency is high.