7results about How to "Stable operating conditions" patented technology

The invention discloses a four-step-in-one negative pressure oil-carrying shutdown method for a styrene dehydrogenation reaction system, and relates to the technical field of styrene dehydrogenation. A negative-pressure steam oil-carrying mode is adopted for the first time, after feeding of the dehydrogenation reaction system is cut off, operation of a tail gas compressor is still maintained, the normal negative-pressure working condition of the reaction system is maintained, and steam oil-carrying under the negative-pressure working condition is carried out; after oil carrying is finished, the tail gas compressor still keeps running, the pressure is gradually increased to micro-positive pressure, and catalyst scorching is conducted; and after scorching is finished, the tail gas compressor is still maintained to operate in the steam cooling and nitrogen cooling processes until nitrogen cooling is finished, the tail gas compressor is stopped, and meanwhile multiple times of starting and stopping of the tail gas compressor are optimized into one-time stopping operation in the stages of steam oil carrying, catalyst scorching, steam cooling and nitrogen circulating cooling. One-time shutdown operation of the tail gas compressor is achieved through negative pressure shutdown, the shutdown operation step sequence of the reaction system is greatly simplified, and the shutdown disposal difficulty of the dehydrogenation reaction system is reduced.

The invention provides an efficient and energy-saving magnetic suspension fan and an operation method, and relates to the field of magnetic suspension fans, the efficient and energy-saving magnetic suspension fan comprises a double-end impeller driving part, a first-stage air inlet pipe orifice, a positioning mounting plate, a first-stage air outlet volute, a second-stage air inlet pipe orifice, a second-stage air outlet volute and a shunt connecting pipeline; the primary air inlet pipe orifice is in bolted connection with the left side of the double-end impeller driving part; the first-stage air outlet volute is in bolted connection with the left side of the double-end impeller driving part; the secondary air inlet pipe orifice is in bolted connection with the right side of the double-end impeller driving part; the second-stage air outlet volute is in bolted connection with the right side of the double-end impeller driving part; the positioning mounting plate is fixedly connected to the inner side of the primary air inlet pipe orifice; the flow dividing connecting pipeline is fixedly connected to the front side of the second-stage air outlet volute. The occurrence probability of fan surge faults caused by filter element blockage is reduced, and the problem that fan surge is triggered after the air inlet density and the effective air inlet amount are easily affected by filter element blockage is solved.

The utility model relates to the field of petroleum chemical technology, concretely relates to a catalyst settlement system stable in operation and good in settlement effect, including clarification mechanism, sludge buffer tank, feed pipeline, sludge tank, backflow pipeline, overflow pipeline, filter press, filtrate tank and sludge discharge pipeline, the clarification mechanism includes a plurality of settlement tanks that are arranged side by side from front to back in proper order and the clarification tank that is arranged at the end of clarification mechanism, the bottom of clarification tank is provided with special ammonium sulfate solution discharge pipeline, is provided with ammonium sulfate solution pump on the ammonium sulfate solution discharge pipeline, the end of ammonium sulfate solution discharge pipeline extends to ammonium sulfate tank area, the outlet end of ammonium sulfate solution pump is equipped with a branch pipeline, this branch pipeline is connected with the feed inlet on the top of filtrate tank through regulating valve, the bottom outlet of filtrate tank is connected with the inlet of clarification mechanism through filtrate pump. The catalyst settlement system is stable in operation, and the downstream device operation cycle is prolonged.

The invention relates to an integrated recovery process of aromatic hydrocarbons in hydrogen peroxide oxidation tail gas, which specifically comprises the following steps: preheating the oxidation tail gas to 95-115 DEG C, introducing the oxidation tail gas into an adiabatic expansion machine for adiabatic expansion, reducing the pressure to 0.1-0.15 MPa, suddenly reducing the temperature to 3-7 DEG C, realizing energy recovery and power generation by using the Joule-Thomson effect, and condensing and separating out most aromatic hydrocarbons; and the condensed tail gas enters the activated carbon adsorption tower for deep adsorption, so that the aromatic hydrocarbon content in the finally discharged tail gas is less than or equal to 70mg / m. Through cooperation of process units, efficient recovery of aromatic hydrocarbons (the total recovery rate is greater than or equal to 95%), self-sufficiency of energy and even negative energy consumption operation (the unit tail gas treatment energy consumption is-5-0 kW.h / 1000 m) are realized, the stability and economical efficiency of an adsorption system are remarkably improved, and the technical problems of high energy consumption, low recovery rate and poor adsorption stability of a traditional cooling and adsorption process are solved.

The invention belongs to the technical field of fuel cells, and particularly relates to a fuel cell flow velocity field on-line test device and method, and the device comprises a separation plate and a flow velocity measurement plate which are arranged in a stacked manner. Flow velocity sensors are assembled on the upper surface of the flow velocity measuring plate in an array mode. A signal channel and a current channel are formed in the flow velocity measuring plate, and the signal channel is formed in the position of the flow velocity sensor; the lower surface of the flow velocity measuring plate is provided with a cooling water flow field. A mounting hole for penetrating through the flow velocity sensor and an air hole are formed in the partition plate; the upper surface of the partition plate is provided with a cathode gas flow field; the device is provided in place of a bipolar plate in a fuel cell. Compared with the prior art, the problems that in the prior art, a test structure is complex, and a test result highly depends on the precision of a calculation model are solved. According to the scheme, on-line measurement of flow velocity field distribution in the fuel cell is achieved, the device can replace a bipolar plate to be assembled at any cell, and testing is flexible.

The invention provides a method and system for separating and purifying bisphenol A through continuous melt crystallization, and belongs to the technical field of separation and purification. The method comprises the following steps: 1, carrying out suspension crystallization on a pre-concentrated solution containing bisphenol A and phenol to obtain bisphenol A-phenol adduct crystal mush; step 2, pre-separating the bisphenol A-phenol adduct crystal mush to obtain a suspension crystallization mother solution and a first thick solid phase, and carrying out rotary melting crystallization on the first thick solid phase to obtain a rotary melting crystallization mother solution and a second thick solid phase; and step 3, performing sweating purification on the second thick solid phase to obtain high-purity bisphenol A. Compared with a traditional separation and purification scheme, the method is simple in technological process, low in energy consumption, high in product purity and capable of continuously and stably running for a long time.

The utility model provides a disc type aluminum-to-nickel tab which comprises a fixing frame, a supporting frame is fixedly installed at the upper end of the bottom of the fixing frame, a rotating disc is rotationally connected to one side of the supporting frame, and a material passing block is fixedly installed on the front face of the supporting frame. According to the disc-type aluminum-to-nickel tab, by arranging a first screw hole, a sliding groove, a moving block, a second screw hole, a pressing block, a rotation stopping piece, a rotating shaft, a material passing plate and other structures, the first screw hole of a side plate and the second screw hole of a moving block connecting plate are connected through a plug pin or a bolt, the moving block is effectively stabilized, the stability of tab limiting is guaranteed, a motor drives a screw to be matched with the sliding groove, and the moving block moves accurately; the pressing block and the non-slip mat achieve reliable limiting of the tabs, an operator can further finely adjust the motor to accurately position the pressing block, the rotation stopping piece can control the rotating disc to be started and stopped according to needs, conveying deviation of the tabs is prevented, the rotating shaft of the material passing block reduces conveying friction of the tabs, the arc-shaped rear end of the material passing plate guides the tabs to stably enter the machining position, and bending deviation is avoided.