428results about How to "Shorten start time" patented technology

The present invention relates to a sulfide type catalyst and a preparation method thereof, pertaining to the technical field of hydrogenation catalyst preparation. The method provided by the invention uses a dipping method to induce the required categories and quantity of active metals with a sulfide agent induced before, after or simultaneously and then obtains the final sulfide type catalyst by thermal treatment. The method provided by the present invention solves the defects of high preparation cost, long sulfide time and high operation cost of a normal oxidized catalyst. The catalyst prepared by the method of the present invention is suitable for an oil fraction hydrogenation process; therefore, the hydrogenation activity of the prepared catalyst can reach or surpass the effect of the normal catalyst.

The invention discloses an operating method for a vulcanized hydrogenation catalyst. The method comprises the following steps: impregnating the vulcanized hydrogenation catalyst with an organic complex solution of a group-VIII metal; carrying out heat treatment so as to allow a layer of a protective film to form on the surface of the vulcanized hydrogenation catalyst; carrying out treatment in the presence of inert gas so as to allow the group-VIII metal to be inlaid in the defect of molybdenum disulfide or tungsten disulfide, thereby forming a high-activity hydrogenation active phase; and then carrying out switching into hydrogen, adjusting pressure and temperature to reaction pressure and reaction temperature after air current is steady, feeding raw oil and beginning a hydrogenation reaction. The method provided by the invention can passivate the vulcanized catalyst, facilitates transportation, storage and filling of the catalyst and can improve hydrogenation performance of the catalyst.

The invention discloses a start-up method for an ex-situ prevulcanization secondary activity center hydrogenation catalyst. After resistance to air loss of a device is qualified, circulating hydrogen compressor working load is adjusted to 0-20% of a maximum load, the catalyst reacts at a low temperature to release heat; when the bed layer temperature rise to 60-150 DEG C, start-up activation oil is introduced, the circulating hydrogen compressor working load is adjusted to 60-100% of the maximum load for wetting of the catalyst; the start-up activation oil is cycled in a reaction system closed path, the catalyst bed temperature is risen to 180 to 230 DEG C by heat exchange; a proper amount of olefin-enriched naphtha is added into the start-up activation oil, the catalyst bed temperature is risen to 300-380 DEG C to complete start-up activation. The start-up method, in the premise of no influence on the use properties of the secondary activity center hydrogenation catalyst, can better use the catalyst characteristics, reduce the device energy consumption, and reduce the device investment cost, and the start-up process can be simplified.

The invention relates to a method for preparing a sulfide type catalyst, which adopts dipping solution to dip a needed catalyst carrier to obtain the sulfide type catalyst through drying and heat treatment. The method for preparing the sulfide type catalyst is characterized in that: the dipping solution contains the sulfide precursor of metal Mo or W and the complex of Ni or Co inorganic salt at the same time. The method overcomes the defects of high preparation cost, long vulcanizing time and high operation cost of the conventional oxidation state catalyst. The catalyst prepared by the method of the invention is applied to the preparation of petroleum distillate hydrogenation catalyst, and the hydrogenation activity of the catalyst prepared by the method exceeds the effect of the conventional catalyst.

The invention discloses a start-up activation method for a hydrogenation cracking process, which comprises the following steps that: (1) a hydrogenation cracking pre-refining reactor and a hydrogenation cracking reactor are adopted in the hydrogenation cracking process, and catalysts are ex-situ presulfurizing catalysts; (2) the hydrogenation cracking pre-refining reactor and the hydrogenation cracking reactor are used for carrying out operation including gas displacement, device airtightness and the like; and (3) activation oil and hydrogen gas enter a gas-liquid separator after entering the hydrogenation cracking pre-refining reactor under the ex-situ presulfurizing catalyst activation condition, a liquid phase separated out from the gas-liquid separator is circulated back to the hydrogenation cracking pre-refining reactor, the closed loop circulation is carried out in the hydrogenation cracking pre-refining reactor, a gas phase separated out from the gas-liquid separator enters the hydrogenation cracking reactor, and the gas phase discharged from the hydrogenation cracking reactor is circulated back to the hydrogenation cracking pre-refining reactor. Compared with the prior art, the method has the advantages that the catalyst sulfurization effect is good, and the excellent reaction effect is realized.

The invention discloses a hybrid excitation type variable frequency AC starting generating system and a control method thereof. The hybrid excitation type variable frequency AC starting generating system comprises a hybrid excitation type variable frequency AC starting generator, a first current sensor for detecting excitation current, a second, current sensor, a third current sensor, three voltage sensors, a position sensor, a changeover switch, a starting switch and a starting generating controller, wherein the second current sensor and the third current sensor are used for detecting armature current. The control method comprises the steps of performing the vector control method based on inverter voltage compensating during starting, and adjusting the excitation current according to the motor armature current and the real-time rotating speed; performing the sectional PI control method based on the output voltage frequency change during generating the power, and adding a load current compensating ring; controlling the changeover switch to switch according to the motor rotating speed and the output voltage during switching from starting to power generation. The method has important application value in the field of aviation independent power starting generating systems.

The invention discloses a method for preparing a platinum-rhenium reforming catalyst. The catalyst comprises an aluminum oxide carrier and the following active components using the carrier as calculation reference: 0.01 to 2.0 mass percent of platinum group metal, 0.01 to 3.0 mass percent of VIIB group metal, 0.1 to 3.0 mass percent of halogen and 0.1 to 0.3 mass percent of SO4<2->. The preparation method comprises the following steps of: (1) selecting aluminum sulfate as an aluminum source, regulating the pH value of the reaction system to be between 7.5 and 8.5, performing full reaction, regulating the pH value of the system to be between 9.5 and 10.5, ageing for 0.1 to 3.0 hours, and washing, drying and roasting solids to obtain the aluminum oxide carrier containing the SO4<2->; and (2) soaking the aluminum oxide carrier containing the SO4<2-> into impregnation solution containing the platinum group metal element, the VIIB group metal element and the halogen, and drying and roasting again; or soaking the aluminum oxide carrier containing the SO4<2-> into impregnation solution containing the VIIB group metal element, drying and roasting, then soaking the carrier into impregnation solution containing the platinum group metal element and the halogen, and drying and roasting again. The catalyst prepared by the method does not need pre-vulcanization before operation, so operation time and steps are reduced.

An electronic control unit of an internal combustion engine performs preheat energization control before activation energization control. In the activation energization control, a gas sensor is energized with electric power capable of heating the gas sensor to activation temperature. In the preheat energization control, the gas sensor is energized with low electric power, which is not enough to heat the gas sensor to the activation temperature. Thus, while there is a possibility that water adheres to a sensor main body of the gas sensor, the sensor main body is prevented from being heated to high temperature. Meanwhile, even if water droplets exist in the sensor main body of the gas sensor, the water is vaporized gradually, while preventing the bumping of the water.

The invention belongs to an operating method for an olefin conversion device and relates to a device for preparing olefin such as methanol to olefin (MTO) and methanol to propylene (MTP) by using organic oxides such as methanol, dimethyl ether and the like. The method is characterized by comprising the following steps that: when the device is operated, catalysts of a reactor 2 and a regenerator 3are respectively introduced from respective catalyst tank and are added in two paths; and the catalysts respectively added into the reactor and the regenerator are heated depending on an external heat source and a heating medium which are independently arranged, namely, the reactor 2 is provided with an operating steam superheater 1 to heat the catalyst by using high-temperature steam and the regenerator 3 is provided with an auxiliary combustor to heat the catalyst by using high-temperature air. When added, the catalysts are not transferred from the regenerator 3 to the reactor 2, namely thecatalysts are not transferred between the reactor and the regenerator.

A position sensorless drive method capable of driving a permanent magnet motor by an ideal sine-wave current and enabling the driving from an extremely low-speed range in the vicinity of zero-speed is provided. A neutral-point potential of the permanent magnet motor is detected in synchronization with a PWM waveform of an inverter. The position of a rotor of the permanent magnet motor is estimated from the variation of the neutral-point potential. Since the neutral-point potential is varied in accordance with the magnetic circuit characteristics of an individual permanent magnet motor, the position can be detected regardless of the presence of saliency of the permanent magnet motor.

The invention relates to an operation-starting method of a sulfurized hydrogenation catalyst. The method comprises the following steps: putting the sulfurized hydrogenation catalyst into a reactor; then pumping inert gases to replace the air in the reactor and pipes in front of and at the back of the reactor and gradually raising the temperature to the activation temperature; and pumping hydrogen to replace the inert gases, adjusting the pressure and temperature to the reaction pressure and temperature after the airflow is stable and putting raw oil to begin hydrogenation. The method overcomes the defects of high preparation cost, long presulfurization time and high operation cost of the conventional oxidized catalysts. The method has the following advantages: the catalyst prepared by the method dispenses with presulfurization and has simple preparation process and operation-starting method; concentrated heat release during operation starting can be suppressed by adopting the inert gases to activate the catalyst; the method is suitable for preparing catalysts for hydrogenation of petroleum fractions; and the hydrogenation activity of the catalyst prepared by the method is superior to that of the conventional catalysts.

The invention discloses a method for quickly starting short-cut nitrification and denitrification of ammonia-containing wastewater. The method includes the steps: (1) putting denitrified activated sludge into a bioreactor; and (2) starting by a way of batch water feeding and gradual increase of the fed water ammonia-nitrogen concentration, and adding an ammonia oxidizing bacteria growth promoter, wherein the ammonia oxidizing bacteria growth accelerator includes 40 to 100 parts by weight of metal salts, 5 to 30 parts by weight of a polyamine substance, 0.05 to 1.5 parts by weight of inorganic acid hydroxylamine and 10 to 40 parts by weight of Na2SO3, the metal salts comprise a calcium salt, a ferrous salt and a copper salt, and the molar ratio of Ca<2+> to Fe<2+> to Cu<2+> is (5-15) to (1-8) to (0.5-5); and (3) when the fed water ammonia-nitrogen concentration reaches 400 to 700 mg / L, changing the mode into a mode of continuous water feeding, continuing to add the growth promoter, and when the ammonia-nitrogen removal rate is more than 90% and the nitrosation rate reaches 80%, starting to add a denitrification inoculum. The method can quickly start short-cut nitrification and denitrification process in a short time, and has the advantages of short starting time and high total nitrogen removal rate.

The invention relates to an operation method of a vulcanized catalyst, which comprises steps of loading the vulcanized catalyst into a reactor, introducing inert gas to replace air in the reactor and air in pipes in front of and behind the reactor, gradually raising the temperature to the activation temperature, switching hydrogen, adjusting pressure and temperature to reaction pressure and reaction temperature after airflow is stable, and introducing raw oil to carry out hydrogenation reaction, wherein a sulfide precursor containing metal Mo or W, Ni or Co, and a catalyst carrier required by the dipping of the dipping solution of an organic assistant are adopted by the vulcanized catalyst, and can be dried to obtain the vulcanized catalyst. The operation method solves the disadvantages of high preparation cost, long prevulcanization time and high operating cost of the traditional oxidation state catalyst. The catalyst prepared by the method does not need to be pre-vulcanized, and the preparation process and the operation method are simple, and are suitable for preparing the petroleum distillate hydrogenation catalyst. The hydrogenation activity of the catalyst prepared by the operation method is better than that of the traditional catalyst.

The invention relates to a method for processing a vulcanized hydrogenation catalyst, which comprises the following steps of: filling the vulcanized hydrogenation catalyst into a reactor, introducing hydrogen to directly raise the temperature and perform thermal treatment of the catalyst, and then adjusting the pressure and the temperature to the reaction pressure and the reaction temperature for hydrogenation reaction, wherein the vulcanized hydrogenation catalyst is introduced with active metals of required categories and number by adopting a dipping method, a vulcanizing agent is introduced before, after or when the active metals are introduced, and the final vulcanized hydrogenation catalyst is obtained by drying. The catalyst prepared by the method does not need pre-vulcanizing; the preparation process is simplified by organically combining a thermal treatment process and an activation process of the catalyst; the processing method is simple and suitable for preparation of petroleum fraction hydrogenation catalysts; and the hydrogenation activity of the prepared catalyst exceeds that of the conventional catalyst.

A start control device of an internal combustion engine capable of realizing a more efficient start control of the engine by recognizing the absolute angle of an engine crank shaft, wherein the absolute angle of the crankshaft (13) is calculated based on the ignition reference signal of the engine and the commutation position pulse signal of a starter motor (10) and the starter motor (10) is controlled based on the absolute angle. The starter motor (10) is rotated reversely based on the calculated absolute angle, and rotated forwardly to start the engine after the crankshaft (13) is temporarily rotated reversely to an expansion stroke, whereby, because the timing of the crankshaft (13) from reverse to forward rotation is controlled accurately by the absolute angle to enable an efficient engine start control, an efficient inertia start control can be realized, and the absolute angle of the crankshaft (13) of the engine can be recognized accurately by a crank angle detector without increasing the number of reluctors (40).

The invention discloses a method for preparing a vulcanized dehydrogenation catalyst. The method comprises the following steps of: preparing an La and Sn-containing aluminum oxide carrier; dipping dehydrogenation active ingredients; performing vapor dechlorination process; and injecting a sulfur-containing compound and drying the carrier to obtain the dehydrogenation catalyst. The dehydrogenation catalyst prepared by the method has the advantages of high activity stability, long service life, high regeneration and the like when used for propane dehydrogenation and is particularly applicable to a technological process for preparing the propane by the propane dehydrogenation.

A hybrid vehicle is provided that includes a control system that controls the time required for engine shut down. An electric machine or integrated starter-generator may be used to apply a load to the combustion engine after an engine shut down signal is received. By reducing the time required to shut down the engine in a controlled manner, the catalytic converter can be conditioned by providing a desired volume of air and fuel to the catalyst to reduce emissions and increase fuel economy. If an indication is received that it is no longer desirable to shut down the engine, the engine may be restarted conventionally or started in a quick start mode by refueling the engine is the engine operating at a sufficient speed for a quick restart.

The invention discloses a treating method for a vulcanized hydrogenation catalyst. The method comprises the following steps: impregnating the vulcanized hydrogenation catalyst with an organic complex solution of a group-VIII metal; and carrying out heat treatment so as to allow a layer of a protective film to form on the surface of the vulcanized hydrogenation catalyst. The method provided by the invention can passivate the vulcanized catalyst, facilitates transportation, storage and filling of the catalyst, enables the catalyst to be directly used without activation during operation and can improve hydrogenation performance of the catalyst.

The invention relates to a chuck (1) for a machine tool for machining a tubular workpiece (26) which rotates about a rotational axis that coincides with the centre of the chuck, comprising at least two chucking slides (7a, b, c) that are designed to be positionable radially with respect to the rotational axis in order to release and chuck the workpiece, are arranged on the end side of and in a manner distributed uniformly around the circumference of a chuck head plate, and bear chucking jaws (8a, b, c). Such a chuck is intended to be created with improved operating characteristics and extension to all chucking functions. To this end, for the external central chucking of a tube (26), there are provided centring slides (27a, b, c) which can be disengaged from the chuck head plate with a forward inclination towards the end of the tube to be machined and centre the tube by means of chucking claws (29) which are arranged at the front, free end of centring slide rods (28), said centring slides (27a, b, c) engaging via a toothed rod section (34) into a toothing (35) of a drive means assigned to each centring slide, and meshing for their part, on a toothing side (37) parallel to the side with the toothing, with a central toothed wheel (33) arranged concentrically with the rotational axis, wherein the central toothed wheel (33) synchronizes the movements of all the centring slides (27a, b, c).

The invention discloses an automatic automobile start and stop control system based on automobile and road coordination. The system consists of a road side unit and a vehicle-mounted unit, wherein the road side unit is used for transmitting geographical position information of a road intersection, a phase state of a traffic signal light and period time information to a vehicle with the vehicle-mounted unit; the vehicle-mounted unit is used for acquiring the current speed of the vehicle, distance information between one vehicle and another vehicle, distance information between the vehicle and the road intersection and the phase state of the traffic signal light as well as the period time information; a main control module carries out calculation processing and judgment according to a vehicle start and stop control logic; and an instruction of decelerating, stopping or starting the vehicle can be sent according to facts whether the distance between one vehicle and another vehicle is greater than a safe vehicle distance and whether the vehicle can directly pass through the road intersection without stopping, so that automatic start and stop control over the vehicle can be realized. The automatic automobile start and stop control system has the advantages that the stay time of the vehicle at the road intersection can be shortened; and if the automatic automobile start and stop control system is used in a large scale, the emission and energy consumption of a traffic system are obviously reduced.

This invention discloses a hydrogenation catalyst pre-curing method. The method used the by-products of the oil and gas industry processing acidic gas as medium sulfide, pretreatment the hydrogenation catalyst, the main component of acid gas is hydrogen sulfide and carbon dioxide, the invention can be used inside or outside of pre-vulcanization mode, put the oxidation states catalyst into vulcanization reactor, heated to200-500degree centigrade in an inert atmosphere, and then conducted hydrogen and acid gas to sulphate under 0.1-10MPa pressure, the reaction time is 0.5 to 30 hours, of which an acid gas occupy 1-40%. The invention method not only overcome the presence of sulfide wet curing agent losses, metal tube surface corrosion defects, also have fast curing process, even curing, can greatly improve the activity and stability of catalysts, extended catalyst life and other advantages, and wide sulfide-media sources, easy to get, significantly lower sulfide cost.

A shift register including a plurality of unit circuits sequentially transfers a start signal supplied to a first one of the unit circuits. Each unit circuit includes a clock terminal, an inverted clock terminal, a control terminal to which an output signal output from the output terminal of a subsequent unit circuit is supplied, a power supply terminal, a first transistor disposed between the clock terminal and the output terminal, a second transistor disposed between the output terminal and the power supply terminal, a capacitor, and a controller that supplies the start signal or the output signal of a previous unit circuit to the gate of the first transistor, and that controls the first transistor to be turned OFF later than a time at which the output signal of the subsequent unit circuit is supplied to the control terminal.

The present invention discloses a method for preparing olefins by using dehydrogenation of light alkanes with sulfur-containing substances added in raw materials, comprising: the dehydrogenation catalyst, which is a platinum group metal-supported catalyst, is not subjected to a reduction and sulfurization before use; and a small amount of sulfur-containing materials are added in the dehydrogenation raw materials for a dehydrogenation reaction directly, wherein the concentration of the sulfur-containing materials in the dehydrogenation raw materials is 5-100 [mu]mol / mol. Compared with the prior art, the method of the present invention improves the stability of the dehydrogenation catalyst, and can effectively prolong the service life of the dehydrogenation catalyst and reduce the carbon deposition rate of the catalyst, thereby improving the economic benefits of preparing corresponding olefins by using light hydrocarbon dehydrogenation.

Provided is a power control device for high-frequency dielectric heating not affected by the magnetron type, characteristic irregularities, or power voltage fluctuation. The device includes input current detection units (71, 72) for detecting input current of an inverter circuit (10) for rectifying (31) AC source voltage (20), performing high-frequency switching, and converting it into a high-frequency power. A mixing circuit (81) mixes input current waveform information (90) on the input current detection units and power control information (91) for controlling the output of the input current detection units to be a predetermined value, thereby outputting ON voltage information (92). A PWM comparator (82) compares the ON voltage information to a saw-tooth wave from a saw-tooth wave generation circuit (83). Pulse width modulation is performed and a drive signal is outputted to perform ON / OFF control of a switching transistor (39) of the inverter circuit.