35results about How to "Improve gas-liquid mass transfer efficiency" patented technology

The invention relates to a microporous gas distributor, which comprises a shell (1), wherein the shell (1) is provided with a gas inlet (5), a liquid inlet (6) and a liquid outlet (7); a ceramic membrane element (2) is arranged in the shell (1), one end of the ceramic membrane element (2) is opened, the other end of the ceramic membrane element (2) is sealed with epoxy resin, and the opening ends of the gas inlet (5) and the ceramic membrane element (2) are communicated. According to the invention, by the micropore properties of membrane material, gas enters from the opening end of the ceramic membrane element and is discharged from the micropores of a side wall so as to make bubbles fine and uniform, and liquid moves from the liquid inlet to the liquid outlet so as to make the bubbles diffused in the ceramic membrane element fully contacted with the liquid in the shell. The gas and liquid mass transfer efficiency is improved, a ceramic membrane has the characteristics of high temperature resistance, high pressure resistance, acid-base resistance and the like and can be used for a long time in various solutions, the continuous operation time is long, the operation is stable, and the operation cost is reduced.

The invention discloses a long-paddle short-blade composite stirrer. The long-paddle short-blade composite stirrer comprises a fixed plate (1), a group of long paddles (2), a connection plate (3) and a group of short blades (4), wherein upper ends of the long paddles (2) are fixed on the fixed plate (1); lower ends of the long paddles are fixed on the top of the connection plate (3); the short blades (4) are fixed at the bottom of the connection plate (3). The stirrer is simple in structure, has surface self-inspiration function and is capable of greatly improving gas-liquid mass transfer efficiency, has good operation flexibility, is applicable to mixing process of liquid with different viscosities or gas-liquid and gas-liquid-solid multiphase dispersion process and also applicable to single-phase mixing process or multiphase dispersion process with continuous change of liquid level.

The invention discloses a method for preparing a polyurethane curing agent. The method comprises the following steps of: firstly, evaporating a curing agent obtained by polymerizing an isocyanate monomer through an external cold type film evaporator to remove part of free isocyanate monomer; and secondly, separating heavy components separated by the external cold type film evaporator through a high-speed rotary bed to obtain a product with lower free monomer content, wherein the content of the free isocyanate monomer is 0.05-0.6 percent by weight. The method disclosed by the invention has theadvantages of small size of equipment, high separation speed, high quality of products, high recovery rate of the monomer, capability of meeting the requirements of environmental friendliness, relatively low requirement on filed and little investment. According to the method, the content of the free isocyanate monomer in the polyurethane curing agent is reduced without remarkably increasing the relative molecular weight and molecular weight distribution of polyisocyanates and the downstream application is facilitated.

The invention discloses a twin exhaust gas purifying tower, which comprises towers I and II and tower circulating pools I and II, wherein the towers I and II are paratactic and serially connected with each other; the circulating pools of the tower I and II are corresponding to the lower parts of the towers I and II; a liquid gathering hopper, a liquid-guiding ring, a nozzle, a spiral flow plate and a top liquid baffle ring are arranged in the tower I from bottom to top; an exhaust gas inlet and an air oxidation device are arranged on the tower I circulating pool; a tower II liquid distributing pipe, a conical cup atomizing layer and a multi-ring whirlwind demister are arranged on the tower II from top to bottom; a clean gas outlet is arranged on the tower II; spacing rings are arranged onthe circulating pools on the lower parts of the towers I and II; circulating pumps are arranged in the circulating pools of the tower I and II; lifting pumps and dewatering pumps are arranged at bottoms of the towers I and II; and a medium conveying pipe is arranged on the upper part of the tower II. By using the twin exhaust gas purifying tower, a gas/liquid mass transfer area is increased, a gas/liquid contact area is updated by repeatedly cutting, the purifying efficiency is high, the consumption of circulating kinetic energy is reduced, the flow speed of idle tower is increased, the reaction of absorbing medium is more complete, the utilization ratio is higher, solid content in cleaning solution in the towers is reduced, the abrasions of the circulating pumps and the nozzle are reduced, the service life is prolonged, and the maintenance is more convenient. The twin exhaust gas purifying tower is mainly used for cleaning, absorbing and purifying the exhaust gas.

The invention discloses a method for continuously and efficiently preparing 2, 6, 6-trimethyl-2-cyclohexene-1, 4-diketone by oxidation. The method includes the steps: (1) performing reaction of raw material liquid and oxygen-containing gas in a spraying and mixing manner to obtain reaction liquid; (2) performing gas-liquid separation on the reaction liquid, adjusting temperature of a liquid phase,and performing reaction of the liquid phase and the oxygen-containing gas in a spraying and mixing manner to obtain reaction liquid; (3) repeating process of the step (2) until reaction is complete to obtain 2, 6, 6-trimethyl-2-cyclohexene-1, 4-diketone liquid. The oxygen-containing gas in the step (2) is a gas phase acquired by gas-liquid separation or newly prepared gas. The raw material liquidcomprises a catalyst, a reaction raw material and a solvent. By the aid of a gas and liquid mixing and spraying mode, the mixing effect of the reaction liquid, the gas and the catalyst is greatly superior to that of a mechanically stirred reactor, bubbles are more uniformly dispersed and sufficiently contact, ideal mass transfer effects are achieved, and reaction is accelerated.

The invention relates to the technical field of sewage treatment and discloses a corona plasma activation method capable of improving the mass transfer efficiency of ozone micro bubbles in a water body. The corona plasma activation method capable of improving the mass transfer efficiency of the ozone micro bubbles in the water body is characterized by comprising the following steps: a) filling gas into the water body to obtain a mixture of the water body and the gas; b) stirring and shearing the mixture obtained in the previous step, so that bubbles are crushed, and the diameter of each bubble is reduced; c) enabling the bubbles obtained in the previous step to generate corona so as to generate the ozone micro bubbles; d) dissolving the ozone micro bubbles into the water body, removing pollutants in the water body, crushing the bubbles in a water and gas mixture before corona to reduce the diameter of each bubble, so that the gas and liquid mass transfer efficiency and the water solubility of the ozone micro bubbles generated during ozonization are improved, further the disinfection efficiency of ozone is improved, and therefore, the water quality is better changed.

An exhaust gas recirculating device for a marine diesel engine comprises a dynamic wave washer. By means of the characteristics of efficient washing and high heat exchanging coefficients of the dynamic wave washer, particular matter and sulfur dioxide in exhaust gas are removed, the exhaust gas is cooled to a certain degree, and the washed exhaust gas is subjected to further cooling of an air cooler, dewatering of a drip separator and pressurizing of an air blower, enters a scavenging header and a combustor to take part in combustion. By means of the exhaust gas recirculating device for the marine diesel engine, efficient washing of the circular exhaust gas can be achieved; compared with existing EGR washing equipment, the structure is greatly simplified, and the initial investment and therunning cost of EGR are reduced; and great potential is provided for following upgrading and improving of the EGR device.

The invention relates to a device for indirect catalytic oxidation of diesel vehicle tail gas pollutants by air micro-nano bubbles. The device comprises: an air collecting bag (8) is connected with amicro-nano bubble generator (2); the upper portion of the micro-nano bubble generator (2) is connected with the upper portion of a reaction tower (5) through a glass tank (3), the lower portion of themicro-nano bubble generator (2) is connected with the lower portion of a reaction tower (5), the top end of the reaction tower (5) is connected with a glass tank (3), and the bottom end of the reaction tower (5) is connected with a diesel vehicle tail gas collecting bag (7). The device is simple in composition, low in energy consumption, easy to operate, capable of improving the gas treatment capacity and more suitable for diesel vehicle tail gas treatment.

The invention discloses a rotating bed with concentric corrugated rings, and relates to the field of gas-liquid mass transfer equipment. The rotating bed with the concentric corrugated rings mainly comprises a cavity, wherein a rotor is arranged in the cavity, a rotating shaft of the rotor penetrates through a baseboard of the cavity, a liquid inlet pipe penetrates through the cavity and a centralchamber of the rotor from the upper portion of the cavity, the liquid inlet pipe and the rotating shaft are installed coaxially, and a plurality of liquid outlet holes are formed in a pipe wall of the liquid inlet pipe; a gas outlet pipe is arranged on an upper panel of the cavity, and communicates with the central chamber of the rotor; and the rotor is composed of an upper disc and a lower disc,one set of concentric corrugated rings with the diameters evenly increasing are fixed between the upper disc and the lower disc, the concentric corrugated rings are composed of multiple peaks and troughs, and any two of the concentric corrugated rings are distributed in a staggered mode, so that the peaks of each concentric corrugated ring face the corresponding troughs of the corresponding adjacent concentric corrugated rings. The rotating bed with the concentric corrugated rings has the advantages that the rotor of the rotating bed is a rotor with the concentric corrugated rings, and circumferential distribution of liquid can be greatly improved, so that the gas-liquid mass transfer efficiency of the rotating bed is improved.