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

The invention relates to spherical silver powder with controllable granularity. The spherical silver powder has more than 99.9 percent of purity and more than 4.2g/cm<3> of tap density, and the granularity D90 of the spherical silver powder keeps being adjustable within an interval ranged from 0.2 mu m to 0.65 mu m based on a reaction system formula and reaction condition changes during a preparation method thereof. The preparation method of the spherical silver powder comprises the following steps of adopting soluble silver salt as raw materials, and preparing to obtain the nanoscale spherical silver powder through a hydrothermal method; adopting the nanoscale spherical silver powder as silver seed crystal, utilizing sediment reaction to induce the silver seed crystal to grow up uniformly, adjusting the growth degree of the silver seed crystal through controlling a reaction system formula and reaction conditions of the sediment reaction, and further obtaining the spherical silver powder with controllable granularity. The spherical silver powder is regular in shape, uniform in granularity, and can realize controllable granularity through process operation.

The invention discloses a method and a device for preparing a nickel iron roasted ore by utilizing a lateritic nickel ore. The method comprises the following steps: firstly, grinding the lateritic nickel ore into an ore powder, then carrying out high-temperature roasting of the obtained ore powder, during the high-temperature roasting process, allowing the ore powder to be in a pre-reduction system and carry out a high-temperature preheating reduction reaction, followed by allowing the high-temperature roasted ore to go into a rotary kiln for high-temperature calcination, thus obtaining a roasted ore containing nickel pig iron after completing high-temperature calcination, and then after dipping the roasted ore into water for cooling, separating to obtain the nickel iron roasted ore. The device comprises a hopper-type elevator, an air chute, a chute draught fan, a rotary feeder, a sluice valve, a rotary kiln, a water-cooling stirring tank, a burner, a hot wind mixing chamber, a high-temperature draught fan, a cyclone dust remover, a bag-type dust remover, a chain-type conveyor, a burner and a pre-reduction system. The preparation method and the device allow the heat transfer area of the ore powder to be large, enable each particle to be uniformly and fully subjected to a chemical reaction, have short reaction time, and have high utilization rate of the lateritic nickel ore.

A micro-channel typed chemical heat pump reactor contains a casing. A heat exchange fluid outlet is arranged on the upper part of the external wall of the casing. The reactor contains an inner cylinder, an outer cylinder, and an interlayer, which is used for accommodating heat exchange fluid, is formed between the inner and outer cylinders. A filter screen and a flange are arranged on the bottom of the casing. Hydride powder is filled in the casing. A totally enclose typed ring micro-channel is arranged inside the reaction bed. High efficiency heat exchange fluid is poured into the micro-channel. The gas enters into the reactor through the filter screen, and reacts with the hydride powder. The reaction heat is brought to the inner cylinder wall of the reactor by fluid circulation of reaction inside the micro-channel, and is taken away by exchange heat fluid. The target of quick speed and high efficiency of heat exchanging is achieved. The invention is characterized by compact device structure, large reagents filling capacity, high heat transfer efficiency, high operation elasticity, and convenient regulation and control and so on.

The invention discloses a method for preparing barium hydroxide by using barium carbonate. The method comprises the following steps of firstly grinding ores containing barium carbonate into ore powder, carrying out high-temperature roasting on the ore powder in a suspension fluidized state to obtain roasted ore containing barium hydroxide, soaking the roasted ore in water to react and generate a barium hydroxide solution, carrying out solid-liquid separation on the barium hydroxide solution, cooling and crystallizing to obtain barium hydroxide products. The method for preparing the barium hydroxide by using the barium carbonate, disclosed by the invention, has the advantages that the heat transfer area of the ore powder is large, each ore particle can uniformly and totally finish a chemical reaction, the reaction time is short, and the utilization rate of barium carbonate is high.

The invention discloses anti-coking alkylbenzene synthesis heat conduction oil. The anti-coking alkylbenzene synthesis heat conduction oil mainly comprises the following ingredients: alkylbenzene base oil, amine antioxidants, phenolic antioxidants, clearing agents and dispersing agents, wherein the content of the alkylbenzene base oil is not lower than 95 in percentage by weight; the initial boiling point of the alkylbenzene base oil is greater than 320 DEG C; the density of the alkylbenzene base oil is greater than 0.83g/cm(3); the flashing point of the alkylbenzene base oil is greater than 180 DEG C; the carbon residue of the alkylbenzene base oil is smaller than 0.02%; the acid value of the alkylbenzene base oil is smaller than 0.02mg KOH/g; the pour point of the alkylbenzene base oil is smaller than minus 55 DEG C; and copper corrosion is smaller than 1 level. The anti-coking alkylbenzene synthesis heat conduction oil has the advantages of high clearing performance, high dispersing performance, low high-temperature degradation, high oxidation resistance, high coking resistance, high sedimentation resistance and long service life. The self-cleaning property is high, and the high cleanliness of the anti-coking alkylbenzene synthesis heat conduction oil can be kept for a long time.

The invention discloses a phosphogypsum circulating fluidized bed reduction roasting comprehensive utilization process and a device thereof. The device comprises a circulating fluidized bed reactor body provided with a slag discharging opening. An air inlet is formed in the bottom of the circulating fluidized bed reactor. A coal feeding hole, a phosphogypsum/mineral mixture inlet, a circulating material inlet and a secondary air inlet are respectively formed in the lower part of a dense-phase zone; a flue gas outlet is formed in the top of the circulating fluidized bed reactor; a primary cyclone separator is connected with a circulating material inlet and a first-stage fluidized bed cooling device; a flue gas outlet of the primary cyclone separator is connected with a secondary cyclone separator; the lower portion of a second-stage separator is connected with the first-stage fluidized bed cooling device; a flue gas outlet of the secondary cyclone separator is connected with a third-stage cyclone separator; the lower portion of the third-stage cyclone separator is connected with a second-stage fluidized bed cooling device; and meanwhile the first-stage fluidized bed cooling device is connected with the second-stage fluidized bed cooling device. The invention aims to realize activation of a phosphogypsum/tailing mixture under a reduction roasting condition at a temperature of about 850 DEG C by blending phosphogypsum/tailing mixed raw material components. Therefore, the efficient roasting technology and the device are the key to efficient and clean utilization of the phosphogypsum/tailings mixed raw materials. On the other hand, semi-hydrated gypsum is a good building material and has a good application market at present. Therefore, the application value of the phosphogypsum can also be improved by making the existing water-containing gypsum into the semi-hydrated gypsum through processes such as drying and the like.

The invention belongs to the technical field of metallurgy and chemical industry and particularly relates to a fluidization-chlorination method for carbonized slag. According to the fluidization-chlorination method, the technical problems that the chlorination rate of an existing carbonized slag chlorination process is low, and the cementation and defluidization of a chlorination furnace are easily caused are solved. The fluidization-chlorination method comprises the following steps: (a) putting carbonized slag particles into a fluidized bed, and introducing chlorine gas for chlorination, wherein the chlorination temperature is 400-650 DEG C, and the chlorination time is 1-10 minutes; and (b) carrying out drip-washing on a mixture obtained in the step (a) by virtue of a titanium tetrachloride drip-washing system, cooling, and separating, so as to obtain the chlorination gas and liquid-state titanium tetrachloride. By chlorinating the carbonized slag by virtue of a rapid fluidized bed,the heat and mass transfer speeds are high, the chlorination speed is high, the problems of cementation and defluidization of the fluidized bed can be effectively avoided, meanwhile, the chlorine gasand the carbonized slag can be recycled, and the production cost is saved.

The invention provides a quick pyrolysis technology for coal. Feed coal with the particle size of 0-50 mm is firstly fed into a straight tube pyrolysis section with the length-diameter ratio being 40:1, mixed with a high-temperature carrier with the temperature of 850-950 DEG C and subjected to dry distillation under fluidization of raw gas, wherein the rising speed of the raw gas ranges from 2 m/s to 8 m/s. Thus, when the pyrolysis technology is used for conducting coal pyrolysis treatment, heat and mass transfer of cold materials and hot materials can be achieved, pyrolysis is quick, the whole pyrolysis process is controlled to be within 10-30 s, the utilization rate of raw materials is up to 100%, and the tar yield is high.

The invention discloses a device and method for microwave-enhanced fluidized ardealite dehydration. The method comprises the following steps: ardealite is added into a system through a screw feeder; hot air provided by a hot blast stove is subjected to venturi drying, attached water in phosphogypsum is removed by a cyclone preheater, and then the hot air enters a wave-transparent heating section of the fluidized bed together with a wave-absorbing powder substance for mixing fluidization; and microwaves penetrate through the wave-transparent heating section in the resonant cavity and are absorbed by the wave-absorbing powder substance and the ardealite, and the removal of ardealite crystal water is simultaneously realized in solid-solid, gas-solid and microwave heating modes by utilizing heat generated by high-speed movement of molecules. Due to the change of the fluidization height of the ardealite without crystal water, the ardealite is separated from the wave-absorbing powder substance. The method and the device are wide in applicability, can realize continuous production of two products by one set of device, and are high in heat efficiency, high in heating speed, uniform in material heating, high in product stability, enhanced in polar component on the surface of hemihydrate gypsum molecules, reduced in contact angle, low in tail gas temperature and small in heat loss.

The invention aims at providing a method for preparing chloropropyl alkyl alkoxy silicon hydride by a passage reaction device for industrial chloropropyl alkyl alkoxy silicon hydride production, so that chloropropyl chloride-containing silicon hydride and excessive alcohol take esterification reaction in the passage reaction device for preparing the chloropropyl alkyl alkoxy silicon hydride, wherein (1) the structure general formula (a) of the chloropropyl chloride-containing silicon hydride is ClC3H6SiCl<n>R<3-n>, in the formula, R is methyl or ethyl, and n=1, 2 or 3; (2) alcohol is methanol or ethanol, and enters the passage reaction device in a gas phase form; (3) the passage reaction device is at least connected with a posttreatment device and a hydrogen chloride absorption device. The problems of difficulty in regulation of yield and amplification effect and the like of large-sized reaction equipment are solved; the defects caused by the large-sized equipment are weakened or even eliminated.

The invention discloses a novel low-pollution bubbling bed gasification combustion reaction device and method. The device comprises a feeding device, a bubbling gasification section, a second-stage combustion section, a last-stage combustion section and a cyclone separation device. Organic solid particles are fed into the bubbling gasification section through the feeding device, meanwhile, air is introduced to make contact with the organic solid particles for a gasification reaction, gasified gas and ash are generated, the gasified gas is sequentially fed into the second-stage combustion section and the last-stage combustion section and fully mixed with the air for a low-oxygen combustion reaction, flue gas is formed, solid particles which are not completely reacted and mixed in the flue gas are isolated by a dust isolation plate and fall to the bottom of the last-stage combustion section, the solid particles are conveyed to the bubbling gasification section through a high-temperature mechanical material returning device to be subjected to gasification reaction again, and the remaining flue gas is conveyed into the cyclone separator to be subjected to dust removal again and then conveyed into a subsequent energy recovery and flue gas treatment system. On the premise of meeting the combustion heat efficiency of the organic solid particles, the generation amount of NOx, SOx and fly ash can be greatly reduced, the height of the furnace body is reduced, and then the follow-up investment and operation cost are reduced.

The invention discloses spray drying equipment for a circulating fluidized bed. According to the spray drying equipment for the circulating fluidized bed, a circulating channel is formed by a fan (1), a circulating pipeline I (2), a dust collector (4), a regulating valve (5), a three-way air inlet joint (6) and a circulating pipeline II (7). An atomizer is arranged in the circulating pipeline II (7). Under the action of the fan (1), air flow enters the circulating channel through an air inlet valve (9) and circularly flows at high speed, a liquid-state material is atomized through the atomizer, enters the circulating channel, goes into a fluidization state under the action of the high-speed air flow, and flows at high speed in the circulating channel, heat exchange and water exchange are quickly performed between the material and the air flow, and wet air is discharged along with air flow separated from the dust collector, so that the liquid-state material can be dried.