摘要:
A catalyst return apparatus is disclosed as well as a riser reactor system comprising the conduit apparatus and a riser reactor, the conduit apparatus comprising a catalyst return conduit and at least two flow control devices in series, each flow control device arranged to control the flow of fluid through the conduit, wherein the length of the catalyst return conduit is more than 20 m. A process for reacting a feedstock in a riser reactor system comprising a riser reactor, the catalyst return apparatus and, and a stage vessel, the process comprising: holding a fluid comprising the catalyst in the at least one stage vessel for a residence time of at least 10 seconds.
摘要:
A power supply system includes a rechargeable battery to deliver a supply current to a load and a circuit to limit a discharge current when the rechargeable battery is supplying power to the load. The power supply system may further include an integrator for integrating a discharge voltage representing the discharge current that exceeds a predetermined limit, a pulse-width-modulation (PWM) circuit for producing a control signal having a PWM duty cycle representing the discharge voltage, and a driver circuit for delivering the supply current to said load according to said control signal. In one embodiment, a digital register is used to set the battery discharging current limit, in another embodiment an analog circuit is used to set the battery discharging current limit, and in yet another embodiment or a combination of the digital register and analog circuit is used to set the battery discharging current limit.
摘要:
The present invention provides a process for methanol coupled catalytic cracking reaction of naphtha using a modified ZSM-5 molecular sieve catalyst, comprising performing a co-feeding reaction of methanol and naphtha on the modified ZSM-5 molecular sieve catalyst to produce low carbon olefins and/or aromatic hydrocarbons. In the process, the modified ZSM-5 molecular sieve catalyst comprises, in term of weight percent, 25-80 wt % of a ZSM-5 molecular sieve, 15-70 wt % of a binder, and 2.2-6.0 wt % of lanthanum and 1.0-2.8 wt % of phosphorus loaded on the ZSM-5 molecular sieve. The naphtha comprises 63.8-89.5 wt % of saturated chain alkanes and 5.6-29.8 wt % of cyclic alkanes. The naphtha and methanol concurrently pass through the catalyst bed, which are reacted during contacting with the catalyst under a reaction condition of a reaction temperature of 550-670° C., a mass ratio of methanol to naphtha of 0.05-0.8, and a total mass space velocity of naphtha and methanol of 1.0-5 h−1.
摘要:
The disclosed embodiments provide an apparatus that controls a current drawn from an adapter by a computer system. During operation, the apparatus senses the current drawn from the adapter using a first current sensor and a second current sensor, wherein a response time of the first current sensor is faster than a response time of the second current sensor. Then, when the current sensed using the first current sensor exceeds a predetermined high-current threshold, the apparatus limits the current drawn from the adapter to a first predetermined current limit. Additionally, when the current sensed using the second current sensor exceeds a predetermined thermal-limit current, the apparatus limits the current drawn from the adapter to the predetermined thermal-limit current.
摘要:
The present invention provides a process for methanol coupled catalytic cracking reaction of naphtha using a modified ZSM-5 molecular sieve catalyst, comprising performing a co-feeding reaction of methanol and naphtha on the modified ZSM-5 molecular sieve catalyst to produce low carbon olefins and/or aromatic hydrocarbons. In the process, the modified ZSM-5 molecular sieve catalyst comprises, in term of weight percent, 25-80 wt % of a ZSM-5 molecular sieve, 15-70 wt % of a binder, and 2.2-6.0 wt % of lanthanum and 1.0-2.8 wt % of phosphorus loaded on the ZSM-5 molecular sieve. The naphtha comprises 63.8-89.5 wt % of saturated chain alkanes and 5.6-29.8 wt % of cyclic alkanes. The naphtha and methanol concurrently pass through the catalyst bed, which are reacted during contacting with the catalyst under a reaction condition of a reaction temperature of 550-670° C., a mass ratio of methanol to naphtha of 0.05-0.8, and a total mass space velocity of naphtha and methanol of 1.0-5 h−1.
摘要:
The disclosed embodiments provide an apparatus that controls a current drawn from an adapter by a computer system. During operation, the apparatus senses the current drawn from the adapter using a first current sensor and a second current sensor, wherein a response time of the first current sensor is faster than a response time of the second current sensor. Then, when the current sensed using the first current sensor exceeds a predetermined high-current threshold, the apparatus limits the current drawn from the adapter to a first predetermined current limit. Additionally, when the current sensed using the second current sensor exceeds a predetermined thermal-limit current, the apparatus limits the current drawn from the adapter to the predetermined thermal-limit current.
摘要:
A power supply system and method for operating same. The power supply system is connectable to receive power from an adapter and supply power to a load. The power supply system includes a rechargeable battery, a buck mode circuit, and a boost mode circuit. A switching circuit switches between the buck mode circuit and boost mode circuit for supplying power to the load. If the power required by the load reaches a first predetermined level related to an adapter overload condition for a first predetermined time, the switching circuit disconnects said buck mode circuit from the load and connects the rechargeable battery and the boost mode circuit to said load. The first predetermined level may be established by a first predetermined percent of the current of a dynamic power management level established by the load, which is related to a power level below that which can be provided by the adapter.
摘要:
The present invention designs a digital token system for the digitalization of physical medium carrying information and the optimization of a physical store, and utilizes the system to digitize the physical medium carrying information such as an identity (including a card) and a financial card (including a bank card), with the employment of electronic medium throughout the manufacturing, issuing and usage process, thus reducing or avoiding the manufacturing of physical media, improving issuing and usage efficiency, and greatly enhancing privacy and security. The present invention is particularly suitable to digitalize any physical medium carrying information carried by a user. The digitalized financial card and other forms of the digital token system are applied to the optimization of a physical store, such that the physical store utilizes the information technology of the mobile Internet to optimize checkout and shopping methods, thus creating novel retail commerce methods of “offline to online (O2O)” and “offline to online+online to offline (double O2O, or 2O2O)” combining offline with online, the retail commerce methods comprising: (1) distributive checkouts; (2) cartless shopping.