39results about How to "Reduced chance of deposition" patented technology

The invention discloses a pressure stabilizing type non-negative pressure water supply system which comprises a water inlet pipe, a water inlet pipe pressure stabilizing device, a water supply power combination device and a water supply pipe. The water inlet pipe pressure stabilizing device is integrally arranged on the water inlet pipe communicated with a municipal tap water pipe, and the water inlet pipe is supplied to all users after being treated and pressurized by the water supply power combination device; the water inlet pipe pressure stabilizing equipment comprises a high-level water tank, a hydraulic cylinder and a pressurizing barrel, the high-level water tank is communicated with the water inlet pipe through an L-shaped pipe, a water replenishing valve is arranged on the L-shapedpipe, the bottom of the high-level water tank is communicated with the pressurizing barrel through a folding pipe, a first electromagnetic control valve and a third check valve are arranged on the folding pipe, and a liquid level sensor is arranged in the high-level water tank; and an output shaft of the hydraulic cylinder is fixedly connected with a piston in the pressurizing barrel, the bottomend of the pressurizing barrel is communicated with the water inlet pipe through a pressurizing pipe, and a second electromagnetic control valve and a fourth check valve are arranged on the pressurizing pipe.

The invention discloses a finned tube and a heat exchanger. The finned tube comprises a base tube body and fins arranged on the outer surface of the base tube body. The finned tube is characterized in that a flow disturbing hole enabling flue gas to be disturbed on an incident flow face is formed in the incident flow face of each fin; the flow disturbing holes extend from the inner ends of the fins to the outer ends of the fins, and the outward extending height is 1 / 2 to 2 / 3 of the height of the fins; the fins are parallel fins or spiral fins arranged at intervals. On the premise of guaranteeing the surface expansion rate of the finned tube, the flow characteristic of flue gas outside a pipeline of the heat exchanger can be improved, the flow speed of flue gas in a trailing vortex area of the pipeline is reduced, and therefore ash deposition of the finned tube is relieved.

The invention discloses anti-corrosion secondary water supply non-negative pressure equipment. One end of a water conveying pipe is connected with a treatment tank; a granular activated carbon filterscreen is fixedly mounted at the top of a treatment tank; an annular fixing frame is fixedly connected to a position, which is located below the granular activated carbon filter screen, in the treatment tank; an annular fixing groove is formed in the bottom end of the annular fixing frame; an ion exchange resin filter element is mounted in the middle of the treatment tank; and the top end of the ion exchange resin filter element is fixedly connected with an upper mounting block. The structure is scientific and reasonable, the equipment is safe and convenient to use, by using the ion exchange resin filter element, free anions and cations in the water are removed, the pH value of water is reduced, corrosion of water to the equipment is reduced, water in the equipment will not be polluted bythe rusts, chlorides in the water can be absorbed by using the granular activated carbon filter screen, and the probability that the equipment is corroded is further reduced.

The invention provides a charge mode of a lithium ion battery. The charge mode is particularly applicable to multiple times of circulated charge of lithium ion batteries at a low temperature of 0-15 DEG C. According to the mode, under the condition of a certain core capacity, an initial value of charge current and an initial value of charge time, equal ratio or arithmetic progressions are set, charge circulation times are calculated according to a processor with a simulation circuit, within the circulation times, a lithium ion battery is charged with power with a positive pulse current which is increased gradually matched with a small negative pulse current in a static charge mode, then the portability of polarization of the lithium ion battery is reduced, and the service life of the lithium ion battery is prolonged. After the lithium ion battery is subjected to multiple times of circulated charge by using the method, the capacity retention rate is relatively high, that is, up to 93% or greater.

The invention discloses a bidirectional water flow channel, which comprises a base plate, wherein a water inlet is arranged at the front section of the base plate; a water outlet is arranged at the rear section of the base plate; a water baffle outer side wall is symmetrically arranged at the left side and the right side of the base plate in parallel; a first water dividing plate, a second water dividing plate and a water baffle piece are arranged on the base plate and between the two water baffle outer side walls; the first water dividing plate and the second water dividing plate are symmetrically arranged left and right at intervals to form a splayed water dividing piece; the water baffle piece is V-shaped and is arranged at the rear part of the water dividing piece at intervals; the openings of the water dividing piece and the water baffle piece both face the direction of the water inlet; water flowing channels are formed between the outer wing of the first water dividing plate and the outer side wall of the water baffle plate, between the outer wing of the second water dividing plate and the outer side wall of the water baffle plate, and between the outer ring of the water baffle piece and the outer side wall of the water baffle plate; and the symmetric lines of the water dividing piece and the water baffle piece are both coaxial with the center line of the base plate. The bidirectional water flow channel is simple in structure, stable in flow, strong in anti-blocking performance, small in manufacturing deviation, low in production cost and long in service life.

The invention relates to a particulate matter concentration detection device. The device comprises an upper shell, a lower shell, an airflow channel, a laser emission device and a photoelectric conversion device. The device has the advantages that filtered clean air enters a sealed sheath flow channel through the two sides of a measuring channel, and the clean air is isolated from the measured airflow, so that the clean air is prevented from diffusing in a free space; a flow guide plate and a laminar flow sheet are arranged on a clearance area of the photoelectric conversion device of the lower shell, the clean air flows under the laminar flow sheet through the flow guide groove, the measured airflow flows above the laminar flow sheet through the flow guide plate, and the clean air forms alaminar flow (cleaning barrier) to wrap and blow the photoelectric conversion device, so that a probability that the particulate matters are deposited on the photoelectric conversion device is reduced, the technical problem that the particulate matter detection is misjudged due to the fact that the background noise caused by deposition of particulate matters in the measured airflow on the photoelectric conversion device is large is overcome, and the technical effects of improving the accuracy and stability of particulate matter concentration detection and prolonging the service life of the device are achieved.

The invention provides a pipe type supercritical water oxidization reactor and a supercritical water oxidization system and method. The pipe type supercritical water oxidization reactor comprises an inner barrel and an outer barrel; the outer barrel sleeves the outer part of the inner barrel; a material inlet is arranged between the inner barrel and the outer barrel; a material outlet is formed inthe top of the inner barrel and a working medium flows in from the gap between the inner barrel and the outer barrel and flows out from the top of the inner barrel; and a fin or an expansion joint isadditionally arranged in the gap between the inner barrel and the outer barrel, so that the turbulent flow is increased, a flow path is lengthened and the heat exchange is reinforced.

The invention discloses a cigarette smoke aerosol testing device. The device comprises a smoke sampling device, a diluting device and an aerosol testing device which are connected by a pipeline in sequence. The device has the following technical effects: 1, real-time testing of the grain size distribution of fresh cigarette smoke aerosols is realized; 2, the smoking forces generated by the cigarettes come from the smoking machines with bell-shaped suction curves and the smoking scheme is standard; 3, the effects of dilution on the testing results of the aerosols are reduced; and 4, partial flow sampling is adopted, thus reducing the particulate matters entering into the diluting system, reducing the probability of particle deposition and reducing the problem of easy blocking of the diluting system and the valves.

The invention provides a process for preparing ammonium salt by recycling waste liquid generated by purifying flue gas. The process is characterized by comprising the following steps of flocculating waste liquid generated by the wet purification of the flue gas to obtain a clear liquid, feeding the clear liquid to a reactor to react with ammonium bicarbonate, after the reaction is completed, carrying out solid-liquid separation on a material liquid, cooling and crystallizing the liquid to obtain a clear liquid as a raw material liquid, pumping the raw material liquid into a pre-heater, feeding the preheated raw material liquid into a heat exchanger, heating the preheated raw material by virtue of shell pass steam in a tube pass of the heat exchanger to raise the temperature, feeding the raw material liquid into a crystallization separator under the pushing action of a forced circulation pump, flashing in the crystallization separator, crystallizing the raw material liquid due to supersaturation to obtain ammonium salt crystals for recycling; and compressing secondary steam generated by flashing by virtue of a compressor as a heat source and feeding the compressed secondary steam into the shell pass of the heat exchanger.

The invention discloses a spiral winding tube type heat exchanger and a variable flow cooling device. The spiral winding tube type heat exchanger comprises a shell (1) and a spiral tube bundle located at the two ends in the shell and installed on a tube plate (6), a tube pass inlet (1-1), a tube pass outlet (1-2), a shell pass inlet (1-3) and a shell pass outlet (1-4) are formed in the shell (1), the spiral tube bundle is composed of a plurality of layers of spiral tubes (2) which are wound into the spiral shape concentrically, and a plurality of spiral tubes (2) are wound in the same direction to form each layer of spiral tubes (2); a plurality of baffle plates (4) are installed between the layers of spiral tubes (2), and the two ends of each baffle plate (4) are fixed to the corresponding spiral tube (2). Not only can the heat exchange strength of fluid in the tubes be guaranteed, but also convection heat exchange of fluid outside the tubes can be strengthened; the exterior of the winding tube type heat exchanger is connected with a temperature sensor, a control system, a variable frequency motor, a pump and other system parts, the flowing amount of cooling mediums can be adjusted in real time, the winding tube type heat exchanger adapts to changes of cooling loads, and the energy-saving requirement is met; meanwhile, the winding tube type heat exchanger has the advantages of preventing scaling and being resistant to corrosion.

The embodiment of the invention provides a cosmetic semi-finished product powder screening machine, and relates to the technical field of cosmetic production. The cosmetic semi-finished product powder screening machine comprises a machine base and a screening mechanism. A screening barrel is installed on the surface of the machine base. The screening mechanism comprises a driving motor, a rotating shaft and an annular screening plate, the driving motor is arranged at the top end of the screening barrel, the rotating shaft is rotationally arranged in the screening barrel and is in transmission connection with an output shaft of the driving motor, and the annular screening plate is fixedly connected to the surface of the rotating shaft in a sleeving mode. According to the semi-finished product powder screening device, semi-finished product powder is screened through the annular screening plate, the semi-finished product powder on the surface of the annular screening plate can be moved through cooperation of the driving motor, the rotating shaft and the annular screening plate, the possibility of deposition of the semi-finished product powder is reduced, and screening of semi-finished product separation is facilitated; the annular blades can cut and crush semi-finished powder bonded into blocks.

The invention provides a heat pump evaporation process for recycling flue gas cleaning byproducts. The process is characterized by comprising the following steps: feeding waste liquor subjected to wet cleaning into a reactor to have reaction with ammonium bicarbonate; after the reaction is finished, carrying out solid-liquid separation on feed liquid, cooling and crystallizing liquid to obtain clear liquid serving as raw material liquid, pumping the raw material liquid into a preheater, feeding the preheated raw material liquid into a heat exchanger, heating the raw material liquid by using shell pass steam in a tube pass of the heat exchanger so that the temperature of the raw material liquid is increased; pushing the raw material liquid into a crystal separator by using a forced circulation pump, performing flash evaporation in the crystal separator so that the raw material liquid is supersaturated and crystallized to obtain ammonium salt crystals which can be recycled; compressing secondary steam (generated by flash evaporation) by a compressor and feeding the compressed secondary steam serving as a heat source into the shell pass of the heat exchanger. The process is particularly suitable for processing sodion waste liquid generated after flue gas desulfurization and denitration and the aims of changing waste material into things of value is achieved and steam consumption is reduced.

The invention discloses a pressure-stabilizing non-negative pressure water supply system, which comprises a water inlet pipe, a water inlet pipe voltage stabilizing device, a water supply power combination device and a water supply pipe. , after the water inlet pipe is processed and pressurized by the water supply power combination equipment, it is supplied to each user; the water inlet pipe pressure stabilization equipment includes a high-level water tank, a hydraulic cylinder and a pressurized cylinder. The high-level water tank is connected with the water inlet pipe through an L-shaped pipe. A replenishment valve is provided, and the bottom of the high-level water tank communicates with the pressurized cylinder through a folded pipe. The folded pipe is provided with a first electromagnetic control valve and a third check valve, and a liquid level sensor is built in the high-level water tank; the output shaft of the hydraulic cylinder It is fixedly connected with the piston in the pressurized cylinder, and the bottom end of the pressurized cylinder communicates with the water inlet pipe through the pressurized tube, and the second electromagnetic control valve and the fourth check valve are arranged on the pressurized tube.

The present invention relates to a photoelectric smoke detector having a double-bulkhead darkroom structure and, more particularly, to a photoelectric smoke detector having a double-bulkhead darkroom structure, comprising: a base having, on one side thereof, a light emitting element receiving part in which a light emitting element for irradiating light to the inside thereof is mounted and, on the other side thereof, a light receiving element part in which a light element for receiving scattered light generated by smoke particles from the light irradiated by the light emitting element is mounted; an outer bulkhead which protrudes toward a lower side of the base to form an outer wall of the smoke detector and in which a smoke inlet having a specific height is formed in a circumferential direction; a lower end surface coupled to a lower end of the outer bulkhead; and an inner bulkhead which protrudes from the lower end surface to an upper side, is disposed to be spaced apart from the outer bulkhead at a specific interval, and is formed to have a height smaller than the height of the outer bulkhead so as to form a gas flow area in an upper portion thereof, wherein smoke flows in through the smoke inlet and passes through a space between the outer bulkhead and the inner bulkhead, and the gas flow area.

The invention provides a combined tube heat exchange device for an alumina decomposition tank and a cooling method, and relates to the field of metallurgical alumina production. The combined tube heatexchange device comprises a plurality of shell-and-tube heat exchangers, each shell-and-tube heat exchanger is provided with a shell, the two ends of each shell are provided with sealing heads, tubeplates arranged at the connection positions of the sealing heads and the shells, each sealing head and the corresponding tube plate define a tube box, and a plurality of heat exchange tubes are arranged side by side between every two corresponding tube plates; and the heat exchange tubes are seamless steel tubes, the two ends of each heat exchange tube are in expansion connection to the corresponding tube plates, and the side walls of the two ends of each shell are respectively provided with a cooling water inlet and a cooling water outlet. Every two corresponding sealing heads are provided with a slurry inlet and a slurry outlet correspondingly, and the multiple shell-and-tube heat exchangers are connected in series and / or in parallel. By means of the combined tube heat exchange device for the alumina decomposition tank and the cooling method, the local abrasion problem in the heat exchange device can be effectively eliminated, and the service life of the heat exchange device can be prolonged.

The invention discloses a healthy slimming method and meal replacement powder for assisting healthy slimming. The meal replacement powder is brewed with plain boiled water at 90 DEG C or above at a ratio of 1:10, and the meal replacement powder can be eaten after being soaked for 15 min. According to the healthy slimming method, a scientific weight loss method is adopted to provide nutrients required for the human body, and the fat consumption is increased by accelerating metabolism of the human body, and if a user sticks to the healthy slimming method for a long term, the effect of slimming and weight control can be achieved.

The invention discloses a latex conveying system in the production process of special polyvinyl chloride resin. The system comprises a discharging filter, a discharging pump, a discharging tank, a latex filter, a first latex conveying pump, a latex storage tank, a second latex conveying pump, a drying filter, an atomizer and a drying tower which are sequentially connected through a pipeline, wherein the latex filter comprises a first cylinder, a first filter cylinder is arranged in the first cylinder, the bottom end of the first filter cylinder makes sealing contact with the bottom surface ofthe first cylinder through a bidirectional sealing rubber ring, and the top end of the first filter cylinder makes sealing contact with the top surface of the first cylinder through the cooperation ofthe bidirectional sealing rubber ring and a polytetrafluoroethylene gasket; the discharging pump is a double-end-face under-pressure centrifugal pump; and the first latex conveying pump and the second latex conveying pump are variable-frequency screw pumps. The invention further discloses a conveying method of the latex conveying system in the production process of the special polyvinyl chlorideresin. According to the latex conveying system and the conveying method thereof provided by the invention, the problems of filter blockage, mechanical seal damage and latex discharge can be effectively solved.

The invention provides a water channel assembly, a base and an air conditioner. The water channel assembly comprises an upper water channel and a lower water channel arranged on the lower side of theupper water channel, wherein the upper water channel and the lower water channel are of elongated slot structures and are in penetrating states along the length direction. The upper water channel shields the lower water channel in the vertical direction. According to the water channel assembly, by combining the upper water channel and the lower water channel up and down, the water channel assemblynot only can collect condensate water generated by a heat exchanger, but also can collect condensate water on the inner and outer side walls of the base of the air conditioner effectively to preventthe condensate water from dropping and the like, so that the using comfort of the air conditioner is improved. Moreover, as the upper water channel shields the lower water channel in the vertical direction, the probability about ash layer deposition in the lower water channel can be further reduced effectively, so that the conditions that the lower water channel is blocked by the ash layer and thelike can be prevented effectively to further prevent the condensate water from being accumulated and dropping to a using space, and therefore, the using comfort of an air conditioner user is improved.

The invention relates to a system and method for realizing desulfurization and denitrification of coke oven flue gas by using waste heat of a rising pipe. A flue gas inlet of a low and medium-temperature flue gas desulfurization and denitrification device is connected with a main flue of a coke oven; a flue gas outlet of the low and medium-temperature flue gas desulfurization and denitrification device is connected with a flue gas inlet of a waste heat recycling device and also connected with a flue gas inlet in a raw gas-flue gas heat exchange device; a flue gas inlet in the raw gas-flue gasheat exchange device is connected with a pyrolysis gas inlet of a denitrification reactor in the low and medium-temperature flue gas desulfurization and denitrification device; a pyrolysis gas outletis connected with a flue gas outlet in the low and medium-temperature flue gas desulfurization and denitrification device; the raw gas-flue gas heat exchange device is arranged on the rising pipe of the coke oven; a flue gas outlet of the waste heat recycling device is connected with a chimney of the coke oven. The system can effectively solve the problem of high operation cost required by analysis and regeneration of a coke oven flue gas denitrification unit, and also realizes full use of the waste heat of a production process of the coke oven.

The invention provides a rotary sewage source heat pump heat exchange device. The rotary sewage source heat pump heat exchange device is characterized by comprising a shell (4), a spiral chute (1) anda rotation driving mechanism, wherein the shell (4) is a cylindrical shell; the spiral chute (1) is spirally formed in the shell (4), a chute body of the spiral chute is provided with a circular-arcinner chute surface (11) serving as a sewage flow channel, and a working medium flow channel (12) is formed below the inner chute surface; and the rotation driving mechanism is used for driving the shell and the spiral chute (1) to rotate synchronously. According to the technical scheme, heat transfer efficiency reduction caused by sedimentation of pollutants in sewage on the surfaces of the flowchannels is avoided or alleviated; and besides, the rotation mode can reduce the downward flowing speed of the sewage, increase the heat exchange area and enhance perturbance in the radial direction of the flow channels, so that the heat exchange efficiency is improved, and the probability of sedimentation in the flow channels is further reduced.

The invention discloses a spiral winding tube type heat exchanger and a variable flow cooling device. The spiral winding tube type heat exchanger comprises a shell (1) and a spiral tube bundle located at the two ends in the shell and installed on a tube plate (6), a tube pass inlet (1-1), a tube pass outlet (1-2), a shell pass inlet (1-3) and a shell pass outlet (1-4) are formed in the shell (1), the spiral tube bundle is composed of a plurality of layers of spiral tubes (2) which are wound into the spiral shape concentrically, and a plurality of spiral tubes (2) are wound in the same direction to form each layer of spiral tubes (2); a plurality of baffle plates (4) are installed between the layers of spiral tubes (2), and the two ends of each baffle plate (4) are fixed to the corresponding spiral tube (2). Not only can the heat exchange strength of fluid in the tubes be guaranteed, but also convection heat exchange of fluid outside the tubes can be strengthened; the exterior of the winding tube type heat exchanger is connected with a temperature sensor, a control system, a variable frequency motor, a pump and other system parts, the flowing amount of cooling mediums can be adjusted in real time, the winding tube type heat exchanger adapts to changes of cooling loads, and the energy-saving requirement is met; meanwhile, the winding tube type heat exchanger has the advantages of preventing scaling and being resistant to corrosion.

The invention provides a stirring mill with a power-assisted starting component and relates to the field of grinding equipment. The stirring mill comprises the power-assisted starting component, a stirring component and a cylinder body. The stirring component is located in the cylinder body. Multiple gas holes are formed in the bottom of the cylinder body. The power-assisted starting component isused for supplying gas into the cylinder body through the gas holes to loosen materials in the cylinder body. The power-assisted starting component is started before the stirring component is started,so that gas is introduced into the cylinder body from the bottom of the cylinder body, the materials at the bottom are gradually loosened due to the introduction of gas, the probability of material deposition at the bottom is reduced, and meanwhile the materials above the bottom can be loosened, so that the stirring component can be started more smoothly. In this way, the probability of the materials depositing on the bottom of the cylinder body is greatly reduced, and the materials and a grinding medium are more fully stirred, so that the materials are more fully ground, the uniformity of the particle size of the materials obtained after grinding is higher, the market value of the materials can be increased, and the service performance of the materials can be improved.

The invention discloses an energy-saving copper dissolving tank and a copper dissolving method, the energy-saving copper dissolving tank comprises a copper dissolving tank (1) with a built-in spray head, the bottom of the copper dissolving tank is respectively communicated with a buffer tank (2) and a settling tank (3), the buffer tank is communicated with the spray head through a circulating pump (4), the top of the copper dissolving tank is provided with an acid mist suction opening (5), and the settling tank is communicated with the acid mist suction opening. The device has the beneficial effects that acid mist containing oxygen is input into the buffer tank, then input into the copper dissolving tank through the buffer tank and finally pumped away through the acid mist suction opening, small circulation is formed, copper is converted into copper sulfate through an exothermic reaction, the temperature can continuously rise along with continuous dissolution of copper, and therefore steam does not need to be input.

Mixing device (1) for mixing an additive (2) with an exhaust gas flow (3), wherein the mixing device comprises at least one overflow plane which is arranged in a mixing section of an exhaust gas line. The exhaust gas duct (6) has a cross section (7) and a main flow direction (8) of the exhaust gas flow (3). The mixing device is characterized in particular in that the at least one overflow plane (4) is arranged centrally in the mixing section (5) and is oriented in the main flow direction (8) of the exhaust gas flow (3), wherein in A plurality of closed recesses (9) are formed in the overflow plane (4). The proposed mixing device achieves efficient mixing of the exhaust gas flow with additives without high flow resistance.

The present invention relates to a photoelectric smoke detector having a double-bulkhead darkroom structure and, more particularly, to a photoelectric smoke detector having a double-bulkhead darkroom structure, comprising: a base having, on one side thereof, a light emitting element receiving part in which a light emitting element for irradiating light to the inside thereof is mounted and, on the other side thereof, a light receiving element part in which a light element for receiving scattered light generated by smoke particles from the light irradiated by the light emitting element is mounted; an outer bulkhead which protrudes toward a lower side of the base to form an outer wall of the smoke detector and in which a smoke inlet having a specific height is formed in a circumferential direction; a lower end surface coupled to a lower end of the outer bulkhead; and an inner bulkhead which protrudes from the lower end surface to an upper side, is disposed to be spaced apart from the outer bulkhead at a specific interval, and is formed to have a height smaller than the height of the outer bulkhead so as to form a gas flow area in an upper portion thereof, wherein smoke flows in through the smoke inlet and passes through a space between the outer bulkhead and the inner bulkhead, and the gas flow area.

The embodiment of the invention discloses a rotating device and a blood pump, and the rotating device comprises a rotating assembly which comprises a body and blades; a through groove is formed in the middle of the body; the blade is fixed on the inner wall of the through groove; under the condition that the rotating assembly rotates, the blades are used for pushing blood to flow in the through grooves. According to the blood pump, due to the fact that the blades are directly fixed to the inner walls of the through grooves, no gap exists between the blades and the inner walls of the through grooves, shear stress is prevented from being generated between the blades and the inner walls of the through grooves, and the situation that the gaps between the blades and the inner walls of the through grooves cause damage to blood cells and hemolytic reaction can be prevented; meanwhile, the blades are suspended in the middle of the through groove and are not connected with the hub, so that a low-speed area at the joint of the blades and the hub is eliminated, the possibility of blood deposition is reduced, and blood coagulation is prevented.

The invention relates to glass strengthening liquid as well as a preparation method and application thereof. The glass strengthening liquid comprises the following components in percentage by mass: 0.8%-15% of an alkaline reagent, 0.05%-0.5% of a surfactant, 0.1%-1% of a chelating agent, 0.5%-5% of an auxiliary agent and 78.5%-98.55% of water, the auxiliary agent is selected from a borate compound and / or a polyol compound. The alkaline reagent can react with silicon dioxide in the glass to achieve the purpose of eliminating or passivating microcracks; the borate and / or polyhydric alcohol auxiliaries can reduce the damage rate of hydroxyl ions to a new surface layer, reduce the scratch ratio of the glass and improve the impact strength of the glass; the surfactant can increase the permeability and dispersity of the chemical polishing solution, so that the possibility of deposition of chemical polishing products on the glass surface is reduced; the chelating agent can avoid the influence of water quality on the strengthening result. In addition, hydrofluoric acid and concentrated sulfuric acid do not need to be used, harm to the human body and the environment is avoided, and operation is safe.

The invention discloses a cigarette smoke aerosol testing device. The device comprises a smoke sampling device, a diluting device and an aerosol testing device which are connected by a pipeline in sequence. The device has the following technical effects: 1, real-time testing of the grain size distribution of fresh cigarette smoke aerosols is realized; 2, the smoking forces generated by the cigarettes come from the smoking machines with bell-shaped suction curves and the smoking scheme is standard; 3, the effects of dilution on the testing results of the aerosols are reduced; and 4, partial flow sampling is adopted, thus reducing the particulate matters entering into the diluting system, reducing the probability of particle deposition and reducing the problem of easy blocking of the diluting system and the valves.

The invention relates to the field of polysilicon, and particularly relates to a system for preparing polysilicon granules in a fluidized bed and a process for preparing polysilicon by using the same. The system comprises a fluidized bed reactor, a cyclone separator, a fine silicon granule seed crystal tank and a silicon granule feeding tank, wherein the fluidized bed reactor comprises a fluidized bed reactor barrel and a fluidized bed expanding section; the bottom of the fluidized bed reactor barrel is provided with a product discharge outlet, the lower part of the fluidized bed reactor barrel is provided with a silicon source gas inlet and a diluting gas inlet, and the fluidized bed reactor barrel is externally wrapped with a reactor heating device; the top of the fluidized bed expanding section is provided with a reaction tail gas outlet; the top of the fine silicon granule seed crystal tank is provided with a silicon seed crystal feed inlet and a tail gas outlet; the bottom of the fluidized bed expanding section is fixedly connected with the top of the fluidized bed reactor barrel, and the diameter of the fluidized bed expanding section is greater than that of the fluidized bed reactor barrel. The system prolongs the service life of the fluidized bed reactor, saves energy, and prevents polysilicon from being contaminated by the outside; and an effect of continuous production is achieved, thereby improving the production efficiency.