47results about How to "Improve long-term operational stability" patented technology

The invention relates to an iron catalyst which contains an assistant and used for catalyzing the Fischer-Tropsch reaction, which is characterized by comprising the components with mass ratios of Fe: Cu; K: Ti: SiO2 equal to 100: (0.1-10): (0.1-10): (0.01-5): (5-30), wherein, Fe, Cu, K and Ti exist in the form of oxides. The invention also relates to a preparation method for the catalyst, which comprises the steps that: at the presence of a precipitator with a pH value of 6-9, ferric nitrate, copper nitrate and a titanium compound are deposited in water; a deposit is separated and mixed with potassium carbonate and silica sol after being washed; a mixture obtained is dried and calcined. The iron catalyst with the assistant of titanium structure has relatively large specific surface area, CO conversion activation and antiwelding and antisulphour properties.

The invention discloses an extraction method of humic acid, namely an NF+UF extraction method of humic acid in percolate MBR+NF membrane trapped fluid. The extraction method is advanced, economic, free of secondary pollution and convenient and reliable to operate and has simple flow and small occupied area, and equipment used in the extraction method is simple.

The invention relates to a titanium-containing nickel-based catalyst, as well as a preparation method and application thereof. The titanium-containing nickel-based catalyst comprises NiO (A), vector (B), TiO2 (C) and at least one rare-earth metal oxide RE2O3 (D), wherein the vector comprises Al2O3. The invention also relates to a method for preparing the titanium-containing nickel-based catalyst, which comprises the following steps: (a) nickel cation, rare-earth metal cationic aqueous solution and titanium precursor aqueous solution are provided; (b) the solution in the step (a) is precipitated by using precipitator to obtain suspension or slurry; (c) the suspension or slurry obtained in the step (b) is separated to obtain solid precipitate, and the solid precipitate is mixed with alumina sol, or mixed with Al cationic aqueous solution to form sol; and (d) the sol is granulated and calcined to obtain a high-temperature methanation catalyst. The catalyst contains TiO2 structure auxiliary, so that the carbon deposit phenomenon in the methanation reaction is wakened.

The invention provides a preparing method of an alloy high temperature oxidation resisting nanostructure conductive coating, i.e. a spinel powder reduction coating method. On one hand, coating powdermaterial with favorable sintering performance is obtained by the regulation and control of the preparing process of coating powder material and effective reductive treatment; on the other hand, a nanometer microstructure film is prepared on the alloy surface by adopting silk screen assisted improved sizing agent coating technology. The film has controllable and even thickness and superior performance, and coating is tightly combined with the alloy; the coating alloy has lower area specific resistance (ASR) and higher long-time running stability under high temperature oxidation environment. Thespinel powder reduction coating method originated by the invention has simple film manufacturing method, low cost and strong repetitiveness, can be applied to coating preparation of alloy with different shapes or sizes, has superiority especially when preparing the large-area alloy coating in practical application, can greatly lower the preparing cost of the alloy coating and has strong applicability.

The invention relates to a coating production line and particularly relates to a coating water purification system which is realized by the following technical scheme that: the coating water purification system comprises a raw water tank, a raw water pump connected with the raw water tank, a mechanical filter connected with the raw water pump through a pipeline I, an active carbon filter connected with the mechanical filter, a high-pressure pump I connected with the active carbon filter through a pipeline II, and a reverse osmosis set I connected with the high-pressure pump I. Compared with the background technology, the coating water purification system is more energy-saving and environment-friendly and has lower cost.

The invention relates to a rainfall sensor, which comprises an outer cylinder, a rain bearing opening located at the top part of the outer cylinder, a first collecting funnel, an anti-blocking device located at the bottom part of the first collecting funnel, a second collecting funnel located below the anti-blocking device, a measurement sensing switch located below the second collecting funnel, a first water collecting funnel located below the measurement induction switch, a weighing container located below the first water collecting funnel, a weighing induction unit arranged in the width direction of the weighing container, a load component located at the bottom part of the weighing container, a second water collecting funnel located below the load component, a base plate located at the bottom part of the outer cylinder, a vertical plate arranged on the base plate, and a pressing unit fixed on the vertical plate. The rainfall sensor provided by the invention reduces usage of tubular and porous structures, reduces locking circumstances, uses the load component to act as a weighing device, measures the rainfall by adopting resistance strain weighing technologies, and can improve the measurement accuracy.

The invention discloses an amphoteric substance-based polyamide nanofiltration membrane surface modification method, and belongs to the field of membrane material modification. The technical problems that an existing nanofiltration membrane is not high enough in interception performance, the rejection effect of the membrane surface on pollutants is not large, and the actual service life is short are solved. The modification method comprises the following steps: (1) dissolving substances such as dopamine and 2-bromoisobutyryl bromide in an organic solvent, and conductiing mixing with a buffer solution to form a coating solution; (2) enabling one side of the active layer of the base membrane to be in contact with the coating solution, slowly conducting oscillating for a certain time, taking out the membrane, and storing the membrane in an isopropanol solution; and (3) grafting zwitterions on the surface of the composite membrane coated with polydopamine by virtue of a surface-initiated atom transfer radical polymerization method. The desalination performance, the selective separation performance and the anti-pollution performance of the modified polyamide composite membrane are remarkably enhanced, the treatment effect of the composite membrane in brackish underground water application is improved, and the service life of the composite membrane is prolonged.

The invention provides a continuous alternating MBBR sewage treatment method and equipment. The treatment method comprises the following steps: suspended granular impurities in sewage are removed by pretreatment, quality and quantity equilibrium treatment is performed on the sewage, then anaerobic phosphorus release and synchronous denitrification and nitrification treatment are performed on the sewage by adopting anaerobic/anoxic/aerobic alternating operation, and pollutant matrix removal efficiency is improved. The treatment equipment comprises a homogenization chamber, a facultative chamber, a transition chamber, a pre-denitrification chamber, an aerobic tank, an efficient sedimentation tank and an equipment control chamber which are communicated through a water pipeline, wherein ultraviolet disinfection equipment, a pipeline booster pump, a full-automatic filtering tank, an aeration fan and a PLC control device are arranged in the equipment control chamber. The treatment equipmentis high in integration degree and functionality and simple and convenient to mount and operate, occupies small area and has high space utilization rate, long-term operation stability of the equipmentis enhanced, and treatment energy consumption and operation and maintenance cost of the whole sewage treatment equipment are reduced.

The invention provides an optical fiber sensing device based on ultrasonic frequency detection, and an implementation method thereof. The optical fiber sensing device comprises an ASE light source, an optical fiber coupler, a sensing unit, an ultrasonic generation device, a photoelectric converter and a signal processing module. According to the invention, sensing is carried out through the optical fiber, the Fabry-Perot cavity principle is utilized, light emitted by the ASE light source generates an interference spectrum in the Fabry-Perot cavity, the interference spectrum is detected, the ultrasonic frequency is measured, digital output is realized through the signal processing module, and the purpose of displaying on a computer is achieved. According to the invention, the size of the sensing unit is reduced, the sensing sensitivity is increased, and the purpose of monitoring the ultrasonic frequency is realized. Meanwhile, the ultrasonic frequency can be output on the host, and real-time monitoring of the ultrasonic frequency is achieved.

The invention relates to an outdoor terminal of a high-voltage direct current cable, comprising upper fittings, insulating sleeves, lower fittings, insulating fillers, cables, lower conductor lead-out rods, connecting conductors, upper conductor lead-out rods, stress cones, insulating sleeves, and upper fittings . The lower fittings form a sealed chamber 1, which is filled with an insulating filler. The inner bottom of the sealed chamber 1 is provided with a sealed chamber 2. The lower end surface of the connecting conductor is connected to the top of the sealed chamber 2 through the lower conductor lead-out rod, and the lower conductor lead-out rod extends to In the second sealed chamber, the upper end surface of the connecting conductor is connected to the upper conductor lead-out rod, and the upper conductor lead-out rod passes through the upper fitting and protrudes; the cable passes through the lower fitting and extends into the second sealed chamber, and is connected to the lower conductor lead-out rod, and the cable is close to the lower part Part of the conductor lead-out rod is sheathed with a stress cone. The stress cone is set in the second sealing chamber, which effectively isolates the contact between the stress cone and the insulating filler, avoids the aging of the stress cone material caused by the contact, and realizes long-term operation with high stability.

The invention relates to a system and a process for recycling second-acid tower kettle liquid waste heat. The system comprises a second-acid tower, a third-acid tower and a reboiler B, wherein the liquid discharge port of the tower kettle of the second-acid tower is connected to the shell pass liquid inlet of the third-acid tower reboiler B, and the liquid discharge port of the third-acid tower reboiler B is connected to the liquid inlet in the middle of the third-acid tower. According to the invention, by arranging the third-acid tower reboiler B, the second-acid tower kettle liquid waste heat is effectively recovered, and the water consumption and the power consumption are reduced, so that the energy consumption is reduced; and the heat required for heating the third-acid tower kettle utilizes the second-acid tower kettle liquid waste heat, so that the use amount of heating steam of the third-acid tower is reduced so as to reduce the energy consumption.