38results about How to "Increase heat and mass transfer rate" patented technology

The invention relates to the industrial field of petroleum natural gases and in particular to a device and a method for continuously separating methane in a coalbed methane-air mixture by using a hydrate. The device comprises one twisted strip hydrate preparation device and two laval hydrate preparation devices, wherein the twisted strip hydrate preparation device is used for improving heat and mass transfer through a twisted strip; the laval hydrate preparation devices are used for increasing supercooling degrees by using laval ejection tubes; two three-phase separation devices are arranged behind the twisted strip hydrate preparation device; one three-phase separation device is at a storage state; another one three-phase separation device is at an hydrate decomposition state; and the twostates can be transformed into each other. Through spiral flows generated by the twisted strip, the hydrate can be fed into the three-phase separation devices in a pulp manner without being blocked in the twisted strip hydrate preparation device; a coalbed gas which is not completely reacted is fed into the laval hydrate preparation devices, then methane hydrate generation conditions are met, andmethane in the coalbed gas can be further extracted; the two laval hydrate preparation devices at a preparation state and a decomposition state are available, and through transforming of the two states, an industrial requirement of continuous hydrate preparation is met.

The present invention relates to a vacuum vapor compression distillation sea water desalination device comprising: a sea water pump, a seal chamber, a vacuum evaporation chamber and a vacuum pump and other components. In operation, a drive shaft drives the vacuum evaporation chamber filled with fresh water to rotate, after the formation of a vacuum area without water, sea water is fed in, and at the same time working vapor is fed in a vapor pipe coil, heat transfer between the vapor in the vapor pipe coil and the outside sea water enable the condensation of the vapor to obtain fresh water, while the sea water volatilizes to form primary vapor; and after temperature and pressure rise via a impeller, the primary vapor is fed in the vapor pipe coil as the working vapor for continuous vapor compression distillation to achieve sea water desalination. According to the device of the invention, centrifugal force is employed to replace the gravity to obtain a vacuum environment, operations are all in room temperature, no external heat source is required, and circular energy supply is achieved by the utilization of latent heat of the vapor; the water production rate and the energy utilization rate of the system are high; and the device has advantages of a simple process, a compact structure, little corrosion and scaling, etc.

The present invention belongs to a humidification-dehumidification desalination method and apparatus for sea water or brackish water, and the apparatus includes pretreatment system and a humidification-dehumidification system. The pretreated seawater or brackish water is introduced into a storage tank, preheated by a heater, pumped into a humidification tower; and then the seawater or brackish water passes through an overhead liquid distributor and directly contacts with the bottom-up carrier gas flowing through a packed column, so as to humidify the carrier gas; and the carrier gas with high humidity is introduced to dehumidification tower bottom via a pipeline, and direct contacts with the top-down cooling water, and the water vapor is condensed and discharged with cooling water, so as to obtain fresh water. The method uses the characteristics of large specific surface area and small resistance of the filler, realizes gas-liquid interphase faster heat and mass transfer, and is applicable to sea island, desert and thermal power plants. Compared with the prior desalination technology, the apparatus has the characteristics of simple equipment, easy operation, easy treatment and cleaning, small investment, and easy operation and maintenance.

An injection flow mixer which includes a central ejector, an outer ring ejector, and a total ejector; the central ejector is coaxially arranged in the outer ring ejector, and the front parts of the two are concentrically fixed, and the middle of the two The rear part is concentrically nested; the output port of the outer ring ejector is surrounded by the output nozzle of the central ejector, and they are directly connected to the total mixing chamber of the total ejector and its total mixing tube. Compared with the prior art, the invention has the advantages of small weight and axial dimension, high ejection rate and good performance at high flow rate.

The invention discloses a nano-fluid micro-channel photovoltaic photothermal integrated evaporator / heat collector, which is mainly composed of a glass cover plate, a nano-fluid and its flow channel, a micro channel, a photovoltaic cell, a thermal insulation material layer and a frame. The invention combines a microchannel with a nanofluid-PV / T heat collector based on spectral frequency division; the microchannel is immersed in the nanofluid and placed in the middle of two photovoltaic cells, which can simplify the heat transfer thermal resistance of the heat collector. structure and guarantee low occlusion. The size of the microchannel and the nanofluid flow channel are matched, the heat transfer rate is high and the specific surface area is large, which can ensure the heat transfer effect in the flow channel regardless of natural circulation or forced circulation. At the same time, it can be used as a heat collector (single-phase working medium in the microchannel) and evaporator (two-phase working medium in the microchannel) at the same time according to application requirements.