38results about How to "Reduce shaft power" patented technology

The invention relates to a slurry pump, in particular to a charging pump used for a press filter in coal washing industry. The slurry pump comprises a bracket for supporting a pump body, wherein the pump body comprises an impeller, a main shaft and a pump shell. The slurry pump is characterized in that: the pump shell comprises a suction chamber, a primary pump shell and a secondary pump shell connected in turn end to end, wherein a primary impeller is arranged in the primary pump shell; a secondary impeller is arranged in the secondary pump shell; the primary impeller and the secondary impeller are arranged relatively; the side wall of the suction chamber is provided with a feed port; the tail end face of the suction chamber is provided with a suction chamber outlet; the suction chamber outlet is communicated with a primary pump shell inlet formed on the front end face of the primary pump shell; the side wall of the primary pump shell is provided with a primary pump shell outlet of which the direction is arranged along the tangential direction of the wall of the primary pump shell; the primary pump shell outlet is communicated with a secondary pump shell inlet formed on the outer end face of the secondary pump shell; the side wall of the secondary pump shell is provided with a discharge port; and the direction of the primary pump shell outlet is arranged along the tangential direction of the wall of the pump shell. Thus, the slurry pump accords with water conservation characteristics of fluid, reduces the resistance of the fluid in a pump body cavity, and is favorable for reducing the shaft power.

There is provided a centrifugal compressor apparatus including a centrifugal compressor that centrifugally compresses a gas, an electric motor that rotatably drives the centrifugal compressor, a current detector that detects a drive current I of the electric motor, and an exhaust valve that discharges a compressed gas to a lower pressure section. The centrifugal compressor apparatus (A) detects the drive current I at a sampling cycle ts, (B) updates, as a current threshold, in real time, a value “(moving average)−n×(standard deviation)” for which a plurality of drive currents measured in a sampling period tp serves as a population, where n is a positive number in the range of 3 to 4 and, (C) determines that surging has occurred when the exhaust valve is closed and the drive current I is below the current threshold X, and (D) further opens the exhaust valve to discharge the compressed gas when determining that surging has occurred.

The invention discloses a water outlet body structure which comprises a water outlet main body. The water outlet main body comprises a water outlet body cover and a water outlet body liner. The water outlet body liner is sleeved with the water outlet body cover which is connected with the outer wall of the water outlet body liner in a clamped mode. The water outlet body liner comprises a water inlet end and a water outlet end. The water outlet end protrudes out of the water outlet body cover. A fluid cavity of a smooth step structure is formed in the water outlet body liner. Internal threads are formed in the portion, at one end of the water outlet end, of the cavity wall of the fluid cavity. At least two notches are evenly distributed in the side face of the water outlet body cover circumferentially. Through holes are formed in the portions, corresponding to the notches, of the end face of the water outlet body cover. By means of the water outlet body structure, it can be ensured that smooth transition is adopted for the streamline of the fluid cavity, a good diversion effect is achieved, the effect of reducing hydraulic loss is achieved through the regular area change of collected water, the high-flow lift and efficiency are remarkably improved, the shaft power is reduced, the work efficiency of a pump is improved, and cost is reduced.

The method relates to a method for recycling extractant in high-viscosity coal-based oil dreg extraction residues. The method comprises the following steps: (1) carrying out solid-liquid separation ofan extraction residue phase and residues to respectively obtain an extraction phase and a viscous solid phase and introducing the extraction phase into a next process; (2) adding the viscous solid phase into a film dryer and indirectly heating to respectively obtain washing oil steam and oil dreg particles; (3) cooling and separating the oil dreg particles to respectively obtain cooled oil dreg particles and a gas phase, introducing the gas phase into a torch system and introducing the cooled oil dreg particles into a residue discharging pipeline; (4) enabling the washing oil steam to flow through a Venturi washing tower to respectively obtain tower bottom circulating liquid, condensed washing oil and uncondensed light oil steam, cooling the tower bottom circulating liquid and then returning the tower bottom circulating liquid to a Venturi in the tower, returning the condensed washing oil to an extraction stage for reusing; (5) condensing the uncondensed light oil steam to respectively obtain uncondensed gas and condensed excess oil in a tower tray at the top of the tower; and (6) exhausting the uncondensed gas. The method is low in investment, easy to implement and high in benefit.

The invention relates to a large ammonification high pressure spherical stirring reaction kettle. A kettle body is welded by two spherical shaped kettles, the upper portion of the kettle body is provided with a feeding port, a discharging port, a safety relief device and an instrument control device, and the lower portion of the kettle body is provide with a skirt support. A stirring device is arranged at the upper end of the kettle body and matched with the kettle body in sealed mode, a motor, a reducer and the stirring device and sequentially connected, the lower portion of a stirring shaft penetrates into the kettle body, and a stirring device is fixed on the stirring shaft. A discharge pipe extends the a center position of the lower portion of the kettle body along the inner wall of the kettle body, a heat exchange device is arranged in the kettle body, the kettle body is made of an explosion double-layer composite plate material, an inner layer is made of stainless steel, an outer layer is made of carbon steel, the stirring shaft and the stirring device which are arranged in the kettle are made of stainless steel, and the heat exchange device is made of titaniumtim. The large ammonification high pressure spherical stirring reaction kettle has the advantages of guaranteeing energy conservation and consumption reduction, heat-transfer capability, homogeneity capability, antiseptic property and product quality of ammonification high pressure spherical stirring reaction kettle along with the enlargement of volume of the reaction kettle.

The invention discloses a concave structure of an outlet edge of a double-suction centrifugal closed impeller. An impeller inlet and blades are designed according to the structure of a common centrifugal pump impeller. All the outlet edges of the impeller are respectively provided with a concave structure. The outer diameter of an outlet of the impeller of the structure D2 is equal to 9.82*(ns / 100)-1 / 2(Q / n)1 / 3. The smallest diameter of a V-shaped groove in the middle D' is equal to (2-K')D2. The concave structures are arranged on all the outlet edges of the impeller, so that the length difference between an inner wall streamline of a runner and an outer wall streamline of the runner can be reduced, flowing of media in the runner can be directly improved, and vortexes are reduced orderly. Consequently, the energy consumption and noise of a centrifugal pump are reduced, and the shutout point lift and the shaft power of the double-suction centrifugal pump are reduced.

The invention discloses an ultralow-temperature coal economizer for a single-reheat unit, particularly for a single-reheat coal-fired power generation unit. The ultralow-temperature coal economizer can replace low-pressure heaters to heat condensed water and is provided with condensation type heating surfaces which can recover vaporization latent heat of water vapor contained in part of discharged smoke. Low-temperature condensed water is used for absorbing nearly half of evaporation heat in the water vapor contained in the smoke; the temperature of the smoke is reduced to 50 DEG C; and electric energy generated additionally by a sixth-stage vapor extractor, a seventh-stage vapor extractor and an eighth-stage vapor extractor which are replaced can reduce the heat consumption of a generator set by 2.3%. Compared with the prior art, the ultralow-temperature coal economizer does not exclude partial vapor extraction or vapor extraction at a certain stage but completely replaces the low-pressure heater; water-side resistance of the ultralow-temperature coal economizer is far less than the sum of water-side resistance of four low-pressure heaters, and the shaft power of a condensate pump is reduced remarkably; the temperature of smoke which enters a desulfurizing tower is reduced remarkably, dosage of process water is reduced substantially, and the power consumption of an induced draft fan is reduced remarkably; and in a condensing and heat-releasing process, water vapor can also absorb PM2.5, SO3 and NOx in the smoke, and the micro-discharge of the coal-fired power generation unit is facilitated.