Methods and systems for controlling proppant concentration in a hydraulic fracturing slurry include measuring volumetric flow rates of fracturing fluid input to a blender and hydraulic fracturing slurry output from the blender, using these measured values to calculate a volumetric flow rate of proppant input, a slurry density and/or a slurry volume fraction, adjusting first and second valves to control rates of fluid and proppant delivery to the blender and re-measuring the volumetric flow rates and recalculating until target values of volumetric flow rate of proppant input, slurry density and/or slurry volume fraction are achieved.

A droplet preparation and size control device based on electrowetting step emulsification is provided, including a syringe pump, a metal pipeline, a micro-channel, two electrode plates, a continuous phase container and a direct-current power supply, wherein: the syringe pump, the metal pipeline and the micro-channel are successively connected; an outlet of the micro-channel is clamped and sealed between the two electrode plates; each electrode plate consists of four layers, respectively a base layer, a conducting layer, an insulating layer and a hydrophobic layer; a cathode of the direct-current power supply is connected with the metal pipeline, and an anode of the direct-current power supply is connected with the conducting layer of each electrode plate; the syringe pump is filled with dispersed phase fluid; continuous phase fluid is injected into the continuous phase container and immerses the electrode plates. The present invention can adjust a supply voltage under a constant flow, so as to change sizes of droplets through changing a contact angle, and can also adjust the voltage under a flow fluctuation situation, so as to stabilize generation of the micro-droplets, thereby preparing the ultra-uniform micro-droplets. The ultra-uniform micro-droplets have important application prospects in fields of chemical engineering, pharmaceuticals, biomedicine and biochemistry.

An apparatus for preserving beverages is provided with a measuring device which is suitable and intended to determine a flow rate of a liquid flowing through a beverage line and with a pump device which delivers a preservative and in particular dialkyl dicarbonates into the beverage line, wherein a delivery line is provided which opens into the beverage line and the pump device delivers the dialkyl dicarbonates through this delivery line and wherein the pump device can be controlled as a function of a flow rate determined by the measuring device, wherein the pump device is constructed as a reciprocating piston pump.

Provided is an apparatus and a method for producing a mix of a first type of food products and a second type of food products that fulfills at least two target criteria including a desired weight ratio between the first and second type of food products and a lean/fat ratio of the mix. At least three controllable in-feed channels at an in-feed end of a conveyor supply separate streams of the first and second food products. One of the in-feed channels supplies the first type of food products and two of the in-feed channels supply a second type of food products being distinguished via a different lean/fat ratio estimate. The determined weight of food products and the measured lean/fat ratio of the food products are used as operation parameters so that the mix fulfills the at least two target criteria.

The density of slurries produced by mobile blender for injection into oil and gas wells is controlled using a microwave flow meter. Liquid having a known density is provided to the blender. The liquid is flowed through a conduit and discharged into a blending tub on the mobile blender. The amount of liquid introduced into the tub is measured with a liquid flow meter. Solid particulates having a known density are provided to the blender. The particulates are discharged into the tub by allowing them to fall into the tub from a conveyor on the mobile blender. The amount of the particulates falling into the tub are measured with a microwave flow meter. The flow of the liquid and the particulates are controlled in response to the measurements to blend a slurry having a predetermined density. The slurry is provided for injection into the well.

This application discloses a slurry processing apparatus and a battery processing device. The slurry processing apparatus may include a slurry mixing assembly, a viscosity monitoring assembly, a controller, and a suction pump. The slurry mixing assembly may be configured to mix a slurry. The viscosity monitoring assembly may be configured to monitor a viscosity parameter of the slurry in the slurry mixing assembly. The controller may be separately connected to the slurry mixing assembly and the viscosity monitoring assembly, and the controller may be configured to receive the viscosity parameter and control operation of the slurry mixing assembly based on the viscosity parameter. The suction pump may have an inlet, and the inlet of the suction pump may be connected to the slurry mixing assembly through a first pipe for sucking the slurry in the slurry mixing assembly.

Embodiments provide mixing methods, systems, apparatuses, devices and assemblies that enable high-accuracy mixing of two or more substances in a manner that controls the concentrations of one or more substances in the resulting mixture. A mixing apparatus (100) may enable mixing of two or more substances at a mixing zone or conduit (112). The mixing apparatus may include one or more sensors (120) for detecting one or more characteristics of the mixture during the mixing process. The sensors may detect the mixture characteristics continuously, at intervals or as prompted by a user. The mixture characteristics may be used, in the sensors or in control circuitry, to generate an indication of the concentration of a first constituent substance in the mixture. Based on the detected concentration, the mixing apparatus may automatically adjust a supply of the first substance to the mixing zone or conduit (112).

A sauce spreading apparatus according to the present invention includes: a stirring part including a stirring module provided to, by rotating, stir a semi-finished product together with an input seasoning so as to produce a product; an input part provided to move the semi-finished product forward so as to deliver same to the stirring module; and a discharge part provided to move forward the product discharged from the stirring part, so as to provide same to a workbench.

The present disclosure discloses a process for the continuous manufacture of a liquid pharmaceutical composition, the process comprising providing a mixing unit, feeding a therapeutic agent and a liquid vehicle to the mixing unit, operating the latter thereby mixing the agent and the vehicle into a liquid pharmaceutical composition, discharging the composition into a holding unit.

A method for preparing a biomass slurry for subterranean injection can include obtaining a quantity of a biomass slurry feedstock from a source, wherein the biomass slurry feedstock comprises a plurality of pieces, where the biomass slurry feedstock comprises a composite of cellulose in a lignin matrix, hemicellulose fibers in a lignin matrix, or any combination thereof, and where each of the plurality of pieces has a size not to exceed approximately 60,000 m. The method can also include obtaining a volume of a fluid, where the fluid comprises a salt content of at least approximately 0.05%. The method can further include mixing the plurality of pieces and the volume of fluid to form the biomass slurry, where the plurality of pieces are substantially evenly distributed within the fluid, and where the biomass slurry is configured to be used in the subterranean injection.