40results about How to "Realize targeted regulation" patented technology

The invention provides a gasification device and a gasification method for preparing hydrogen-rich synthetic gas from biomass. The device comprises a biomass feeder, a mixer, a pyrolysis chamber, a gasification chamber, a gasified gas separator, a combustion chamber, a flue gas separator, a bin and a butterfly valve. In the method, the biomass gasifying process is divided into three parts, namelybiomass pyrolysis, semicoke gasification and heat carrier circulation. Through the method and the device, the synthetic gas with the tar content less than 200mg / Nm<3> and the H2 / CO ratio more than 1.1 can be obtained, and the energy utilization rate and the process economy are obviously improved.

The invention discloses a method for extracting high-activity lignin from biomass and lignin extracted by the same. The method comprises the following steps: (a) obtaining high-purity and high-activity lignin from a biomass raw material ground to 20-60 meshes by using an alcohol organic solvent through an acid liquid precipitation way; and (b) hydrolyzing the residue obtained in the step (a) with cellulase at 50 DEG C for 72h to obtain high-yield fermentable glucose for bioethanol preparation. In the invention, pretreatment using isopropyl alcohol is creatively proposed under specific conditions to break a lignin-carbohydrate bond and a beta-O-4-aryl ether bond so as to efficiently separate and extract low-molecular weight high-activity lignin, and theoretical basis and technical support are provided for further high-value utilization. Moreover, the pretreatment method remarkably improves the enzymolysis efficiency of the fiber raw material and provides an effective way for next bioethanol production.

The invention discloses a method for promoting microbes to synthesize docosahexaenoic acid (DHA) by an exogenous additive factor. The method comprises the following steps of: inoculating the microbes into a fermentation culture medium for fermentation to synthesize the DHA, adding the exogenous additive factor into the fermentation culture medium before the fermentation synthesis, and / or adding a precursor matter for synthesizing fatty acid during the fermentation synthesis, wherein the microbes may be any one of thraustochytrium, schizochytrium and crypthecodium cohnii; the exogenous additive factor is any one or the combination of several of acetic acid, citric acid and simvastatin; and the precursor matter for synthesizing the fatty acid is the acetic acid. In the invention, under simple and effective fermentation control, substrate conversion efficiency is improved, operation is simple, no extra labor and equipment are added, and the synthesizing concentration and production strength of a target product can be improved by just relatively low additive investment, so that production cost is reduced. And the method is pollution-free, increases no manpower and material resources, reduces the cost, is simple and convenient and creates economical benefit.

The invention relates to a catalyst for rapid pyrolysis and liquefaction of biomass as well as a preparation method and application of the catalyst and belongs to the technical field of biomass energy. The catalyst consists of a carrier and an active component, wherein the active component is loaded onto the carrier through an immersion method. The carrier is a side product rapid pyrolysis carbon produced from the rapid pyrolysis and liquefaction of biomass; the rapid pyrolysis carbon is deoiled, delimed, activated and oxidized to form a middle-large hole structure with holes of 20-80 nanometers; the active component is a transition metal which is immersed onto the carrier through the steps of loading and reducing; then the catalyst for the rapid pyrolysis and liquefaction of biomass is prepared. By adopting the catalyst provided by the invention, the problem of high additional value utilization of the side product rapid pyrolysis carbon is solved, the adaptability to a pyrolysis reaction environment is strong, and the directional adjustment and control for the rapid pyrolysis and liquefaction of biomass can be realized.

The invention discloses a method and a device for pulse composite magnetic field assisted GMAW high-speed welding. The device comprises a direct-current pulse adjustable excitation power supply and apulse composite magnetic field generation device, and the direct-current pulse adjustable excitation power supply is connected with the pulse composite magnetic field generation device; the pulse composite magnetic field generation device comprises a GMAW welding gun and magnetizing iron cores arranged on the outer edge of the GMAW welding gun; and the magnetizing iron cores comprise a plurality of magnetic poles, magnetic pole heads are arranged along the circumference of the GMAW welding gun, an included angle is formed between the upper portion of each magnetizing iron core and the center line of the GMAW welding gun, and excitation coils are wound around the upper portions of the magnetizing iron cores. By controlling the inclination angle in the welding direction, the amplitude and frequency of left and right swing and residence time on two sides of a weld joint of droplet metal and a welding arc, transverse spreading and backward flowing of liquid metal in a molten pool can be improved, and under certain welding parameters and magnetic field parameters, the purposes of eliminating the defeats namely, undercut and the humping defect can be achieved.

The invention belongs to the field of composite materials, and relates to a preparation method of a polyvinylidene fluoride (PVDF) porous coordination composite ultrafiltration membrane material. The preparation method is characterized in that transition metal ions are immobilized on a PVDF membrane by using molecules with double amino groups, and the in-situ growth of porous coordination polymers (PCPs) in an organic ligand solution is realized. The preparation method provided by the invention has the advantages that a new method for preparing the PVDF / PCPs composite ultrafiltration membrane material by a one-pot method is developed; PVDF and the PCPs are connected through chemical bonds, and the high-stable ultrafiltration membrane material is formed; by adjusting the types and content of organic ligands and metal source ions in a precursor solution, reaction conditions, and the like, the pore structure, growth amount, and the like of the PCPs can be effectively controlled, thereby achieving the directional regulation and control of membrane properties; the PVDF / PCPs ultrafiltration membrane material prepared by the method integrates porosity and hydrophilicity, the anti-fouling ability of an ultrafiltration membrane is improved, and the service life is prolonged.

The invention provides a coal-based active coke hole structure grouping regulation method based on coal internal ash catalytic activation and relates to the field of porous carbon materials. The method aims to solve the problems that in traditional coal-based porous carbon material preparation methods, microporous carbon materials obtained through physical activation methods have poor adsorption academic properties and universality and chemical activation methods require a large number of activators and a high cost. Coal is used as a raw material, an inorganic component in inherent ash of thecoal is directionally removed through different kinds of de-ashing pretreatment, namely acid washing or alkaline washing, the catalytic pore forming effect of the natural ash is utilized, and after acatalytic physical activation process and a subsequent cleaning process, a microporous carbon material or a graded porous carbon material with excellent gas adsorption / storage characteristics can be obtained. The method is applied to the field of porous carbon materials.

The invention discloses colloidal gold partly modified by polyethylene glycol and a preparation method thereof. The preparation method comprises the following steps of (1) preparing the colloidal gold; (2) fixing nanogold on a glass solid phase carrier; (3) modifying the colloidal gold by using the polyethylene glycol; and (4) preparing a solution of the colloidal gold partly modified by the polyethylene glycol. 80-95% of the surface region of the colloidal gold prepared by the method is covered by the polyethylene glycol, and the other 5-20% of the surface region is still a bare gold surface. The stability of the colloidal gold partly modified by the polyethylene glycol prepared by the preparation method in complex mediums and the selective recognition of the colloidal gold to target proteins are obviously enhanced. Through asymmetrically modifying the colloidal gold, directional adjustment and control of reactions can be realized, and the uncontrollable agglomeration and sedimentation problems caused by isotropic colloidal gold in traditional method are also solved; and the colloidal gold partly modified by the polyethylene glycol is expected to be widely used in nano-assembling and biosensing fields.

The invention discloses a method for restoring heavy metals by regulating microorganisms through iron-containing minerals, and belongs to the field of biological treatment of pollutants. The method comprises the steps of enriching and domesticating original florae in heavy metal contaminated soil and water, and then adding the enriched original florae and different iron-containing minerals into the heavy metal wastewater together. The iron-containing minerals have certain conductivity as a (semi)conductor material, and can be used as an electron shuttle carrier to mediate an electron transferprocess. Interspecific electron transfer among anaerobic microorganisms can be enhanced, directional regulation of communities are realized, and reduction of high-valence heavy metals can be cooperated. The required iron-containing minerals widely exist in the nature, the raw materials are easy to obtain, the operation is simple, the reduction activity of anaerobic microorganisms can be remarkablyregulated and controlled, and the remediation effect of heavy metal pollutants is enhanced.

The invention discloses a directional regulating method for a systematic structure of a high-strength high-toughness ultra-fine hard alloy material. The method comprises the steps of establishing a researching platform for designing a hard alloy cutter substrate and a wearing-resistant coating microsturcture; performing directional regulating on distribution and dispersion of a crystal grain inhibitor and segregation thickness in a WC / Co interface according to a performance requirement; establishing thermodynamics information of a temperature interval, a solubility interval and phase stability in generating each deposit of a diamond coating, and researching influence of technical conditions such as precursor kind and component and deposition temperature and pressure to properties such as phase kind and component of the diamond coating; and based on a metastable phase graph of a pseudobinary CrN-AlN system and a phase change driving force of each phase, predicting the phase structure and the phase composition of sosoloid at different temperatures, thereby realizing phase field simulation of a CrAlN base coating spinodal decomposition process. According to the method of the invention, a cooperative function and a strengthening and toughening mechanism of the crystal grain growth inhibitor are disclosed in an atom scale, and furthermore directional regulating of the high-strength high-toughness ultra-fine hard alloy microstructure is realized through a thermal-dynamic analysis facility.

The invention relates to a quantitative optimization method for a pyrogenic-process copper smelting slag form and belongs to the field of pyrogenic-process copper smelting technology. According to the method, first, a basic smelting slag system is determined according to composition characteristics of a technological form of copper smelting slag, percentage content of all components in slag phases and corresponding physical and chemical properties in a silicate system; CaO, SiO2 and Al2O3 in the slag system are used as variables, the percentage content of the remaining components is used as a fixed amount, the relation between relevant process variables is calculated according to the multi-element multi-phase equilibrium calculation principle of the Gibbs free energy minimization method, the mass percentage content of all phases in the copper smelting slag is calculated, and a topological method is utilized to draw a corresponding multi-element system phase diagram under normal pressure and designated temperature; positioning calibration is performed in the multi-element system phase diagram, phase composition and viscosity characteristics of a phase area nearby a composition point and other phase areas are analyzed, CaO / SiO2 is determined through calculation, and therefore the adding amount of CaO is determined; and experimental exploration is performed based on a theoretical analysis result, and comparative analysis is performed to determine the smelting slag form. Through the method, directional adjustment and control of the copper smelting slag form are effectively realized.

The invention discloses a method for extracting high-activity lignin from biomass and lignin extracted by the same. The method comprises the following steps: (a) obtaining high-purity and high-activity lignin from a biomass raw material ground to 20-60 meshes by using an alcohol organic solvent through an acid liquid precipitation way; and (b) hydrolyzing the residue obtained in the step (a) with cellulase at 50 DEG C for 72h to obtain high-yield fermentable glucose for bioethanol preparation. In the invention, pretreatment using isopropyl alcohol is creatively proposed under specific conditions to break a lignin-carbohydrate bond and a beta-O-4-aryl ether bond so as to efficiently separate and extract low-molecular weight high-activity lignin, and theoretical basis and technical support are provided for further high-value utilization. Moreover, the pretreatment method remarkably improves the enzymolysis efficiency of the fiber raw material and provides an effective way for next bioethanol production.

The invention relates to the technical field of environment monitoring and particularly relates to an intelligent building indoor environment monitoring system. The system comprises an inspection robot, a sensor group arranged in a building, a controller, a remote server and RFID tags which are arranged in different areas and have unique numbers, and environment control standards of the current area are loaded in each RFID tag; the inspection robot is used for realizing inspection of the working condition of the sensor group and inspection of an environment abnormal area fed back by the current sensor group; the sensor group is composed of a plurality of sensor nodes and is arranged on the basis of pressure-sensitive adhesive pasting, and a fault repair module is loaded in each sensor and is used for realizing repair of sensor faults in a short message early warning mode. According to the method, comprehensive monitoring of the indoor environment of the building can be realized, environment control targets of different areas are fully considered, and the environment quality and the personnel satisfaction degree are effectively improved.

The invention relates to a sludge anaerobic digestion additive and a method for promoting methane production through the additive. The method includes the steps of putting 0.1-1.0% of dry papermaking white mud in sludge to be stirred with water to obtain a mixture material with the pH value of 7.5-8.0 and the solid content of 5-15%, putting the mixture material in an anaerobic reactor, and conducting sludge anaerobic digestion over stirring at a constant temperature of 35-38 DEG C or 53-55 DEG C. Papermaking white mud produced in sulfate method pulping, papermaking and causticizing procedures serves as the sludge anaerobic digestion additive, and the dynamic balance of sludge hydrolytic acidification and methanation is regulated and controlled in an oriented mode; the digestion time is shortened by 15-25%, and the methane yield is increased by 40-80%. Operation is easy, running expenses are low, and the pollution of papermaking white mud and sludge to the environment is reduced; after residues produced after sludge anaerobic digestion are subjected to solid-liquid separation, biogas residues serve as a soil conditioner and are directly applied to soil, and biogas slurry is directly used as water-soluble fertilizer.

The invention belongs to the technical field of graded utilization of low-rank coals and biomasses and specifically relates to a graded utilization device and method for low-rank coals and biomasses based on chemical chains. A reduced oxygen carrier and low-rank coal particles or biomass particles are mixed to be subjected to a rapid pyrolysis reaction, and the reduced oxygen carrier generates anoxidized oxygen carrier; pyrolysis cokes, the oxidized oxygen carrier and a pyrolysis gas-liquid phase product are separated at the dense phase stage of a two-stage pyrolysis reactor; the pyrolysis cokes and the oxidized oxygen carrier obtained by separation and an oxidized oxygen carrier from an air reactor simultaneously enter a gasification reactor for a gasification reaction, and the oxidizedoxygen carrier is reduced into the reduced oxygen carrier; and the reduced oxygen carrier respectively enters a two-stage air reactor and the two-stage pyrolysis reactor through a distributor. In thewhole process, the graded and efficient recycle of solid carbon-containing raw materials with relatively high volatile components such as the low-rank coals and the biomasses is realized, and meanwhile, pyrolysis reaction control, gradient utilization of energy and internal separation of a reaction product are realized.

The invention discloses a density gradient microstructure, a preparation method of the density gradient microstructure and a magnetically controlled switch, and relates to the technical field of microfluidics, the density gradient microstructure comprises a substrate, the substrate is provided with a plurality of array areas, each array area comprises a plurality of uniformly distributed micro columns, the distance between the micro-columns in different array areas is sequentially increased from one end of the base body to the other end of the base body, and the micro-columns are magnetic. The micro-columns of the density gradient microstructure form a density array area according to a certain rule, and the micro-columns can directionally deflect under the condition of an external magnetic field. The deflection angle of the microcolumn can be controlled by controlling the intensity of the magnetic field, and then the spreading direction of the liquid film is controlled, so that directional regulation and control of the liquid can be realized. The liquid spreading direction can be regulated and controlled in real time in the field of microfluidics, and a new thought is provided for microfluidics, directional screening of drugs and design of microfluidic chips.

The invention belongs to the technical field of sewage treatment. At present, most constructed wetlands have the problem of low denitrification efficiency. Aiming at the problems in the prior art, the present invention discloses a preparation method of wet plant fiber filler that strengthens the denitrification of constructed wetlands. The discarded wetland plants are used as The raw material is pulverized and then microsphered to obtain porous wet plant fiber filler, and then the microorganisms are loaded on the wet plant fiber filler by hanging film culture. The preparation method is simple, and the wet plant fiber filler prepared by the preparation method can continuously and slowly release carbon sources, greatly enhance the denitrification ability of the constructed wetland, improve the denitrification efficiency of the constructed wetland, and there will be no effluent SS exceeding the standard or The problem of COD exceeding the standard.

The invention relates to an enteral slow-release sugar alcohol additive. The enteral slow-release sugar alcohol additive comprises two layers of structures, wherein the inner-layer structure comprisescomponents of xylitol and agar, and the outer-layer structure comprises components of carrageenan or gellan gum or xanthan gum or guar gum, vitamin B12, L-arabinose and fermented bifidobacterium or fermented propionibacterium or fermented lactobacillus. The invention further discloses a method for preparing the enteral slow-release sugar alcohol additive and application of the enteral slow-release sugar alcohol additive. The xylitol, the L-arabinose and the vitamin B12 which are compounded are used, so that directional regulation and control of intestinal microorganisms are realized, and high-concentration synthesis of the propionic acid in intestines is realized.

The invention relates to a method for preparing polycarbonate through catalysis of an ionic liquid. The method comprises the following step: carrying out a melt polymerization reaction on diester carbonate and a dihydroxy compound under the action of an amide ionic liquid catalyst to generate polycarbonate. According to the method disclosed by the invention, the amide ionic liquid catalyst with high catalytic activity, good selectivity and excellent thermal stability is obtained by taking an amide-containing compound as an anion and tetraalkylphosphorus as a cation, and polycarbonate with a large molecular weight and a high glass-transition temperature is obtained through catalysis. The method disclosed by the invention is mild in reaction condition, designable in catalyst structure and relatively high in reaction rate; a solvent is not needed in the reaction process, virulent phosgene is not used, and environmental pollution is avoided; and a product obtained by the reaction is free of catalyst residue and toxic substances, and the method is a green and environment-friendly low-cost polycarbonate preparation process.

The invention belongs to the technical field of functional food, and provides a weight-losing composition and application thereof in preparation of weight-losing products. The weight-losing composition comprises plant polyphenol and prebiotics, and the mass ratio of the plant polyphenol to the prebiotics is 1: 9 to 9: 1. The plant polyphenol is one or two of a polygonum cuspidatum extract, an elderberry extract, a vaccinium myrtillus extract, chinaroot greenbrier polyphenol and an acai berry extract. The prebiotics are a combination of any two or three prebiotics selected from the group consisting of mannose oligomer, xylooligosaccharide, galactooligosaccharide and stachyose. In order to solve the technical problem that the skinny bacteria (Akkermansia muciniphila) in the intestinal tract cannot be directionally regulated, several plant polyphenols and prebiotics are combined, so that the growth of fat bacteria is inhibited while the skinny bacteria in the intestinal tract are proliferated, and the directional regulation and control of micro-ecology in the intestinal tract are realized. The intestinal flora is regulated and controlled through the natural prebiotics and plant polyphenols, so that the body achieves a good weight reduction effect.

The invention relates to the technical field of environmental monitoring, in particular to an intelligent building indoor environment monitoring system, comprising an inspection robot, a sensor group arranged in the building, a controller, a remote server, and uniquely numbered RFID tags arranged in different areas, Each RFID tag contains the environmental control standard of the current area; the inspection robot is used to realize the inspection of the working conditions of the sensor group and the inspection of the abnormal environment area fed back by the current sensor group; the sensor group is composed of several sensor nodes , based on the pressure-sensitive adhesive paste arrangement, and each sensor has a built-in fault reporting module, which is used to report sensor faults in the form of short message warning. The present invention can realize the comprehensive monitoring of the indoor environment of the building, fully consider the environmental control objectives of different areas, and effectively improve the environmental quality and personnel satisfaction.

The invention provides a hazardous waste vitrification regulation and control system. The system comprises a liquid nitrogen cooling subsystem, a flue gas dust removal subsystem and an energy recovery subsystem, wherein the liquid nitrogen cooling subsystem is used for cooling hazardous waste molten materials; the flue gas dust removal subsystem is used for performing innocent treatment on tail gas generated in the liquid nitrogen cooling subsystem; and the energy recovery subsystem is used for recovering and reusing heat in a ceramic membrane filtration subsystem. The invention further provides a regulation and control method based on the hazardous waste vitrification regulation and control system. By means of the method and the system, directional regulation and control over a hazardous waste molten glass body are achieved, and the yield of the hazardous waste molten glass body is increased and can reach 100%; tail gas generated after the hazardous waste is molten is filtered, and harmless treatment of the tail gas is achieved; and energy recycling is achieved, and energy consumption of the system is reduced.

The invention provides a method for adjusting the color of light-colored pterocarpus macrocarpus by saturated steam heat treatment. Saturated steam is used as a hot medium, the conjugated structure ofthe chromophoric system and structure of wood is increased, so that the color of the light-colored pterocarpus macrocarpus is deepened and tends to be the wood color of deep-colored pterocarpus macrocarpus. The light-colored pterocarpus macrocarpus treated by the method has a uniform color, and is changed in a redder and deeper direction in color and similar to the color of the deep-colored pterocarpus macrocarpus. The processed light-colored test material red-green chromaticity index change value [delta]a* is greater than or equal to 4, yellow-blue chromaticity index change value [delta]b* is greater than or equal to 4, and lightness value [delta]L* is decreased to less than or equal to -6. The method is superior in that the color of the light-colored pterocarpus macrocarpus is adjustedby the saturated steam heat treatment, no chemical reagent is introduced, environmental protection is achieved, the cost is lower, and the method is suitable for large-scale industrial processing andproduction.

The invention discloses a biomedical coating on the basis of graphene and titanium dioxide and a method for preparing the biomedical coating. The biomedical coating is a single-layer graphene and titanium dioxide composite coating. The method for preparing the biomedical coating includes transferring the single-layer graphene on the surfaces of substrates; coating titanium dioxide nano-dots on thesurfaces of the graphene by the aid of dip-coating processes. The biomedical coating and the method have the advantages that the biocompatibility of the substrates can be improved by the biomedical coating formed by the titanium dioxide nano-dots and the graphene, and adhesion of proteins and cells on the surfaces of the substrates can be improved; more importantly, the biomedical coating with the single-layer graphene and the titanium dioxide nano-dots is excellent in ultraviolet light and visible light response, surface charge of the biomedical coating can be regulated, and accordingly thecells adhered on the substrates can be hopefully directionally regulated and controlled; the method for preparing the biomedical coating on the basis of the graphene and the titanium dioxide is simpleand is easy to implement.

The invention discloses a density gradient microstructure, a method for preparing a density gradient microstructure, and a magnetically controlled switch, and relates to the field of microfluidic technology, including a substrate, the substrate is provided with a plurality of array regions, and each of the array regions It includes a number of evenly distributed microcolumns, the spacing of the microcolumns in different array regions increases sequentially from one end of the base body to the other end of the matrix body, and the microcolumns are all magnetic. The micropillars of the density gradient microstructure of the present invention form dense and dense array regions according to certain rules, and the micropillars can be directional deflected under the condition of an external magnetic field. By controlling the strength of the magnetic field, the deflection angle of the microcolumn can be controlled, and then the spreading direction of the liquid film can be controlled, so that the directional control of the liquid can be realized. The invention can realize real-time control of the liquid spreading direction in the field of microfluidics, and provides new ideas for microfluidics, directional screening of drugs, and design of microfluidics chips.

The invention belongs to the technical field of graded utilization of low-rank coals and biomasses and specifically relates to a graded utilization device and method for low-rank coals and biomasses based on chemical chains. A reduced oxygen carrier and low-rank coal particles or biomass particles are mixed to be subjected to a rapid pyrolysis reaction, and the reduced oxygen carrier generates anoxidized oxygen carrier; pyrolysis cokes, the oxidized oxygen carrier and a pyrolysis gas-liquid phase product are separated at the dense phase stage of a two-stage pyrolysis reactor; the pyrolysis cokes and the oxidized oxygen carrier obtained by separation and an oxidized oxygen carrier from an air reactor simultaneously enter a gasification reactor for a gasification reaction, and the oxidizedoxygen carrier is reduced into the reduced oxygen carrier; and the reduced oxygen carrier respectively enters a two-stage air reactor and the two-stage pyrolysis reactor through a distributor. In thewhole process, the graded and efficient recycle of solid carbon-containing raw materials with relatively high volatile components such as the low-rank coals and the biomasses is realized, and meanwhile, pyrolysis reaction control, gradient utilization of energy and internal separation of a reaction product are realized.

The invention relates to a method for separating cow milk beta-casein and whey protein at the low temperature through microfiltration to simulate composition of human lactoprotein. Skim milk, whole milk, dried skim milk, concentrated milk protein powder and the like are taken as raw materials, decalcification pretreatment is performed with the adoption of citrate, glucono-delta-lactone and other chelating agents or an acidifier, microfiltration and filter wash are performed with the adoption of a ceramic membrane or a polyethersulfone membrane and the like under the low-temperature (0-15 DEG C) condition, beta-casein and whey protein are selectively enriched into a permeating liquid, the permeating liquid is subjected to spray drying and dewatering after lactose and mineral substances are removed through ultrafiltration and concentration, and high-protein powder containing rich beta-casein and whey protein is prepared. An adopted technical process has the characteristics of being environment-friendly, efficient, high in operability, good in safety and the like and is suitable for large-scale industrial production. The obtained compound protein powder can serve a novel functional lactoprotein ingredient to replace whey protein and is used for research and development of infant food such as formula milk powder and the like, so that the protein molecule composition of the compound protein powder is closer to that of human lactoprotein.

The invention provides a thermoelectric conversion device, a preparation method thereof and a thermoelectric conversion system. The thermoelectric conversion device comprises a first electrode; the P-type element and the N-type element are located on the surface of one side of the first electrode and electrically connected with the first electrode; the second electrodes are located on the sides, away from the first electrode, of the P-type element and the N-type element respectively; the first heat conducting plate is positioned on the first electrode and deviates from the P-type element and the N-type element; the second heat conducting plate is positioned on the second electrode and deviates from the P-type element and the N-type element; the microstructure is located on the surface of the first heat-conducting plate and / or the second heat-conducting plate, the direction from the first surface of the microstructure to the second surface of the microstructure is the same as the direction from the first heat-conducting plate to the second heat-conducting plate, and the area of the first surface is smaller than that of the second surface. The microstructure realizes directional regulation and control of heat flow in the thermoelectric conversion device, so that the temperature difference between the two ends of the thermoelectric conversion device is increased, and the thermoelectric conversion efficiency or refrigeration power of the thermoelectric conversion device is improved.