96results about How to "Does not affect balance" patented technology

The invention relates to a method and a system for heating and melting snow and ice on the road surface under the current surface effect. The system comprises an alternating-current power supply, an input cable, a three-phase transformer, a three-phase balancer, an electrical switch, a temperature control device, a snow and ice melting sensor, a power supply terminal box, highly-ferromagnetic iron pipes, a transitional connecting tube, a high temperature wire, an electrical switch (3), a U-shaped bent-pipe wire penetrating part, an end terminal box, a grounding protector and a cathode protector. A U-shaped surface action heating element which is formed by connecting a plurality U-shaped highly-ferromagnetic iron pipes is energized under the surface effect and the proximity effect to efficiently emit heat to rapidly melt the snow and the ice on the road surface. The U-shaped highly-ferromagnetic iron pipes are buried in the teinforced concrete or asphalt road surface. The U-shaped surface action heating element has high mechanical strength and quite long service life, can be used permanently, is not easy to be subjected to the wire disconnection, is very easy to repair when being damaged, needs only one power supply point, can not affect the three-phase power supply balance, can be heated uniformly, adjusted randomly in temperature and constructed and installed conveniently with least labor, has high degree of automation, does not need electric insulation, is safe, reliable and economical and can not pollute the environment.

The invention discloses a flying capacitor voltage control method for a three-phase five-level active neutral-point-clamped converter. A kth-phase output load current ik, kth-phase flying capacitor voltage VkCf and DC bus total voltage 2Vdc of the converter are firstly sampled; the flying capacitor charging current i'kCf needed by the kth phase is obtained through a pure proportional controller; needed zero-sequence per unit voltage V0pu is obtained according to a decoupling constraint condition for the flying capacitor voltage and neutral point level control; modulated wave upper offset deltamk2 and modulated wave lower offset deltamk3 overlapped on the kth-phase modulated wave mk1 are thus calculated; according to mk2=mk1+deltamk2 and mk3=mk1-deltamk3, modulated waves mk2 for a switch transistor S5 and a switch transistor S6 and modulated waves mk3 for a switch transistor S7 and a switch transistor S8 are obtained; the charging and discharging process of the flying capacitor is then controlled through a carrier phase shift modulation mode; and finally, the purpose of flexibly controlling the flying capacitor voltage without influencing the neutral point level balance and output current of the three-phase converter are achieved, good decoupling effects for flying capacitor voltage control and neutral point level control are realized, and the operation reliability of the converter is ensured.

The invention discloses a virtual resource configuration method and device, electronic equipment and a storage medium, and belongs to the technical field of multimedia. The method comprises the stepsof when a target game account is detected to trigger a reference event, displaying reference virtual resources at a game interface; detecting an acquisition instruction of the target game account; andif acquisition operation indicated by the acquisition instruction meets acquisition conditions corresponding to the reference virtual resources, determining a target virtual resource from the reference virtual resources, and configuring the target virtual resource in the target game account. When the target game account triggers the reference event, the target game account has an opportunity to acquire the displayed reference virtual resources, and if the target game account meets the acquisition conditions corresponding to the reference virtual resources, the target virtual resource determined from the reference virtual resources can be configured. The configuration mode is relatively flexible, the balance of the game intensity is not affected, the game enthusiasm can be excited, and thegame experience of a user is improved.

A main-frequency resonance type electric induction boiler is composed of the induction heater consisting of vertically arranged multiple induction heating tubes, a capacitor, an upper boiler cylinder or upper water collecting tank above said induction heating tubes, and a lower water collecting tank under said induction heating tubers. Said induction heating tube comprises a water tube, an internal heating steel tube and an external electromagnetic induction coil. When said induction heating tube is electrically and parallelly connected with said capacitor, a parallel resonance takes place to save electric energy by 50%.

The invention discloses an energy-saving closed heat pump sludge drying and dehumidifying system and technology, and belongs to the technical field of sludge drying. The system comprises wet sludge forming equipment, a drying room, a moist air circulating fan, a heat pump dehumidifier, a condensed water collecting tank, a dry hot air circulating fan, dry sludge conveying equipment, a conveying device, an evaporator and a condenser. By additionally arranging a surface air cooler, a cooling tower, an intelligent flow valve control system and a U-shaped heat pipe heat exchanger, part of circulating air passes through the U-shaped heat pipe heat exchanger, the surface air cooler and the evaporator during design, and the dehumidification amount of a unit is greatly reduced, so that the dehumidification performance ratio of the unit is higher; the air is circularly used in the drying chamber and the heat pump dehumidifier, tail gas emission is avoided, and pollution to the environment is avoided.

The invention discloses a method for artificially releasing, listing and marking fishes without spines or with spines and without spinal teeth. The method comprises the following steps of: narcotizing a fish; passing a hanging line through a hanging ring on a signboard; after threading the hanging line through a needle, passing the needle through the gap between a first axonost and a second axonost in dorsal fin subcutaneous muscle of the fish; after leading out the hanging line by the needle, crossing the hanging line at two sides of the dorsal fin in front of the dorsal fin to form a coil; connecting the crossed two ends of the hanging line; shearing the redundant hanging line; and then completing by putting the signboard right ahead of the dorsal fin. Before being listed, the fishes are necessary to temporarily cultivate. After being listed, the marked fishes are necessary to temporarily cultivate. According to the method disclosed by the invention, the listing and marking problem of the fishes without the spines on fins or with the spines and without the spinal teeth, in particular small-scale fishes, can be solved; furthermore, after the fishes are listed, the body balance and the movement of the fishes cannot be influenced; the damage on the fishes is low; the survival rate is high; the mark shedding rate can be obviously reduced; and the accuracy of the releasing effect evaluation by using the listing, marking and releasing return-catching method is increased.

The invention discloses an intelligent water quality detection system and detection method. The system comprises a floating frame, a box body is fixedly arranged at the upper side of the floating frame, and a supporting plate is fixed in the box body. The inner space of the box body is divided into an upper section and a lower section by the supporting plate, wherein a wireless control unit is installed in the upper section, a telescopic mechanism is installed in the lower section, and the upper end of the telescopic mechanism is connected with an output shaft of a driving motor in the upper section. The lower end of the telescopic mechanism extends out of the box body, the floating frame and is connected with a detection probe, and the detection probe is connected with the wireless control unit through a control circuit. The intelligent water quality detection system and the intelligent water quality detection method provided by the invention can automatically complete the water bodydetection in real time, and are simple and convenient.

The invention discloses a weighing apparatus intelligent calibrator which includes a base, a pit on the base for holding a weighing apparatus, and a calibration unit on the top of the base. The calibration unit includes a support column vertical to the top of the base, a lever hinged to the top of the support column, a vertically downward force-transferring column fixedly connected to the end of the lever close to the weighing apparatus, and a pressure sensor fixedly and horizontally disposed at the bottom of the other end of the lever. A hydraulic cylinder is disposed right under the other end of the lever when the lever is arranged horizontally. The distance from the hinge joint of the support column and the lever to the pressure sensor is greater than the distance from the hinge joint of the support column and the lever to the force-transferring column. The weighing apparatus intelligent calibrator applies force to the weighing apparatus from the outside, solves a problem that a traditional calibrator is directly pressed on the weighing apparatus and affects the accuracy of a calibration result, achieves a purpose of accomplishing a great task with little effort by using the unequal-arm level, reduces the bearing capacity of the pressure sensor of the calibrator, and is prolonged in the service life. Further, the bottom of the level is designed to be in a latticed shape suchthat the tension and pressure of the lever is increased.

The invention discloses a the technical field of safety regulation and control of vehicle operation and relates to an automatic dynamic tire pressure adjustment system of a vehicle. The tire pressureadjustment system comprises a gas pump mounted at the front part or the rear part of the vehicle, a light gas storage tank connected with the gas pump, and one-way gas valves, hollow sealed half shafts and hollow hubs of a gas distribution system, as well as electric control valve cores and pressure sensors, wherein the one-way gas valves, the hollow sealed half shafts and the hollow hubs are controlled independently; and the electric control valve cores and the pressure sensors are mounted in the hollow hubs. The system adopts a hollow hub design; the use external soft inflation guide tubes connected with the valve core is avoided structurally; an aging risk is effectively reduced; the unsprung mass of the vehicle is effectively reduced; and dynamic balance and appearances of wheels are not influenced. The system adjusts tire pressure of each tire separately, automatically adjusts the tire pressure, enhances performance of the tires, allows the vehicle to be more stable during running, and guarantees safe operation of the vehicle.

The invention discloses a wireless charging coupling mechanism and an unmanned aerial vehicle. The coupling mechanism comprises a transmitting end and a receiving end; the transmitting end comprises an E-shaped magnetic core and three transmitting coils, wherein the three transmitting coils are connected in series; the receiving end comprises two receiving coils which are connected in series; theE-shaped magnetic core is horizontally arranged; the three transmitting coils are annularly wound on each stand column of the E-shaped magnetic core according to a plane; the two receiving coils of the receiving end are laterally arranged according to a preset deviation angle; and when the receiving end approaches the transmitting end, the two receiving coils are embedded spaces between the two adjacent stand columns of the E-shaped magnetic core respectively. The coils of the receiving end are free of a magnetic core and light in weight; the coupling mechanism is based on the horizontal footstool of the unmanned aerial vehicle, so that the structure of the unmanned aerial vehicle is not needed to be greatly modified; the coupling mechanism is easy to install and good in symmetry; the balance performance of the unmanned aerial vehicle will not be influenced; camera devices such as a cradle head of the unmanned aerial vehicle will not be shielded; and meanwhile, the coupling mechanismhas a better transverse offset characteristic.

A projector with air cleaning functionality is equipped with a negative ion generator. The negative ion generator is positioned along a cooling airflow route of the projector and is adjacent to a lamp module. A photo-catalyst sheet, which is stimulated by ultraviolet light emitted from the lamp module, can produce the negative ions quickly. The air, which is circulated along the cooling airflow route, carries the negative ions out of the projector so as to clean air in the surroundings.

The invention discloses a vertical type silicon wafer magnetron sputtering film plating machine. The vertical type silicon wafer magnetron sputtering film plating machine comprises a vacuum chamber, atransmission device, a vacuum-pumping system and a power supply control system, wherein the transmission device is arranged in the vacuum chamber and is used for hanging and moving silicon wafers, the vacuum-pumping system is used for carrying out vacuumizing, and the power supply control system is used for supplying power and controlling a working condition; the vacuum chamber comprises a washing chamber and a sputtering chamber which are hermetically connected mutually, an ion cleaning electrode is arranged in the washing chamber, and a sputtering target is arranged in the sputtering chamber; the transmission device comprises a silicon wafer hanging plate, a hanging plate base and a rail car which are arranged in the vacuum chamber, the silicon wafer hanging plate is detachably connected with the hanging plate base, a groove is formed in the top of the rail car, a bulge portion is formed on the bottom of the hanging plate base, and the hanging plate base is in fixed inserting connection with the rail car through the matching between the bulge portion and the groove. By adopting the design, the volume of the vacuum chamber can be reduced, the vacuum effect is good, the silicon wafers are conveniently picked and placed, residues can be effectively removed from surfaces of the silicon wafers, the silicon wafers can be effectively heated, and film-plated wafers are good in effect.

An electroplating composition with nickel, cobalt and phosphor, the electroplating liquid and method are disclosed. The nickel-cobalt-phosphor alloy consists of nickel 68.5-94.5 wt%, cobalt 5-15.5 wt%, phosphor 0.5-16 wt%, phosphite ion No. 1 compound and crossing agent selected from triethenoid tetrammine, triethenoid tri-amino, ethylenediamine and hydro-nitrogen benzide.

The invention discloses a transient electromagnetic receiving device for a small multi-rotor low-altitude UAV. The transient electromagnetic receiving device comprises a magnetic signal sensor (1) fixed under a UAV landing gear, a matched resistor (2) and a signal amplifier (3) which are fixed on the magnetic signal sensor (1), a mounting box (4) fixed under a UAV pedestal, ad an analog signal acquisition device (5) and an STM32 development board (6) which are placed in the mounting box (4). The connection relationship is as follows: the magnetic signal sensor (1) is connected in parallel withthe matched resistor (2), and then connected to the analog signal acquisition device (5) by means of a lead wire after passing through the signal amplifier (3); and the analog signal acquisition device (5) is connected to the STM32 development board (6) by means of a signal transmission line. The transient electromagnetic receiving device has the advantages of light weight, high efficiency, goodbalance performance, good stability and wide application range, can complete the ground transient electromagnetic receiving operation efficiently, and can launch operations in paddy fields, houses andsteep regions where ground transient electromagnetic construction cannot be carried out.

The invention discloses a tail heat utilization and dust removal integrated coil-fired boiler. A boiler tail gas pipe is connected with a cyclone dust remover in the tangent direction. Dust is discharged through an air-lock valve at the cone bottom after dust removal is conducted through rotational flow. Tail gas is connected with a cone through a rotational flow ascending pipe and penetrates a tube nest after being uniformly scattered. The tail gas is discharged through a discharge pipe by means of an induced draught fan after being concentrated through a conical hopper on the upper portion. An impeller of the induced draught fan is of a structure that blades are in a hollow wedge shape. The appearance contour line of the induced draught fan is an involute. According to the tail heat utilization and dust removal integrated coil-fired boiler, boiler tail heat utilization and dust removal are innovatively integrated, an efficient cyclone dust removal tail heat utilization device is designed, and therefore tail heat utilization and dust removal are completed in one step, the device input is reduced, and the work efficiency is improved; the blades are in the hollow wedge shape, and therefore dust on the impeller of the induced draught fan is removed in real time, the strength of the impeller of the draught fan is increased, stability is enhanced, accidents caused by dust accumulation are effectively eradicated, and application prospects are wide.

The invention discloses an omni-directional self-balancing mobile robot based on an infrared sensor. The robot comprises an objective table, a movable mechanism and a control mechanism. The robot is driven by two wheels and is suitable for work in a narrow space, especially on occasions with severe working environments and complex tasks. The two driving wheels of the robot are independently controlled and are connected through hinging, and when the robot moves on an uneven road surface, the axes of the left and right wheels change, and the balance of the objective table cannot be influenced; by the adoption of the infrared sensor, posture detection of the self-balancing mobile robot is realized, the principle is simple, control is easy, the sensitivity is high, and the response speed is high; a fuzzy PD controller integrating the dual advantages of fuzzy control and PD control is adopted so that self-balancing control of the omni-directional mobile robot can be realized, and article carrying is more stable.

The invention discloses a lithium supplementing sustained-release capsule, an electrolyte thereof and a lithium ion battery, and belongs to the technical field of lithium ion battery electrolytes. Thelithium supplementing sustained-release capsule comprises a capsule core, a first-layer capsule wall and a second-layer capsule wall, wherein the capsule core is a novel lithium salt solution; the novel lithium salt solution is one or two of a lithium difluorophosphate solution, a lithium bis (fluorosulfonyl) imide solution, a lithium bis (oxalato) borate solution and a lithium bis (trifluoromethanesulfonyl) imide solution; the first capsule wall layer is made of a gelatin modified amino resin composite material; and the second capsule wall is an acrylate polymer. The lithium supplementing sustained-release capsule provided by the invention can gradually release internal core liquid in the use process of a battery, so partial side effects of an additive in a battery system are reduced, and the additive can act in the lithium ion battery system for a long time. Meanwhile, lithium ion loss can be supplemented, and the cycle service life of the battery is further prolonged.

This is a two sectional removable spare dam with drain slot on plates and an alarm system. In case of dam break, the alarm system on the spare dam alarms for evacuation and the plates are closed for slow drain via the slots to decrease lost.

The invention discloses a manganese processing rotary kiln system with a gas furnace supplying heat and a draught fan being free of dust accumulation. A rotary kiln is arranged in an inclined mode. A combustor is arranged in the rotary kiln and connected with an air control valve and a gas control valve. An air lock is arranged at the higher end of the rotary kiln for feeding and connected with a dust remover through a fin section and an air pipe. A cover cylinder is arranged outside the fin section, a sleeve type air heat exchanger is arranged outside the air pipe, and the cover cylinder is connected with the gas control valve and the air control valve after being joined with a lower air suction port of the air heat exchanger. The draught fan is of a structure with blades being in a reverse drop shape and a back plate being in a butterfly shape. A convex refractory plate is arranged in the rotary kiln. Through the convex refractory plate, the heat transfer area of the rotary kiln is increased, material stirring is promoted, and heat efficiency is easily improved; through the fin section and the air heat exchanger, tail heat is utilized, and combustion is facilitated; through shock chilling liquid, the environmental protection pressure of production liquid expansion is effectively relieved; because the draught fan is free of dust accumulation, safety accidents are effectively eradicated. The manganese processing rotary kiln system is especially suitable for manganese ore firing processing and has broad application prospects.

A low tire pressure monitoring device (20) that is provided within a tire valve wire stem (210) and methods of using the same. The monitoring device comprises a counter-pressure chamber (21), a flexible membrane (36), a contact member, counter-pressure chamber pin (230), a PC board (29), and a means for emitting a signal. The monitoring device is calibrated by trapping the tire's initial air pressure in the counter-pressure chamber. The monitoring device (20) monitors the pressure differential between the counter-pressure chamber (21) and the tire. When the pressure differential between the pressure in the counter-pressure chamber and the pressure within the tire exceeds a predetermined maximum pressure differential, the flexible membrane (36) is deflected so that an electrical circuit is completed and a warning signal is emitted.

The invention discloses a hot-air drying machine capable of utilizing waste heat and achieving penetrating countercurrent fluidization. The upper portion of a drying tower is connected with an induced draft fan, and the induced draft fan is connected with a cyclone dust removing waste heat efficient recoverer formed by a tube-type heat exchanger and a cyclone dust collector in an overlapped manner in the tangent direction and then is emptied; the air inlet end of the shell side of the tube-type heat exchanger is communicated with the atmosphere, and the air outlet end of the shell side of the tube-type heat exchanger is connected with the lower portion of the drying tower through an air blower and a steam finned heater; and an impeller of the induced draft fan is of a structure that blades are in a hollow and wedged shape and the backing plate is in a disc shape, and the contour line of the appearance of the induced draft fan is an evolvent. According to the hot-air drying machine capable of utilizing the waste heat and achieving the penetrating countercurrent fluidization, creative integration is conducted on waste heat utilization and dust removal, the cyclone dust removing waste heat efficient recoverer is designed out, the equipment input is reduced, and the work efficiency is improved; and due to the fact that sieve mesh cone covers, sieve mesh cone discs, discharging tubes, a stretching vibration transmission shaft and conical plugs are arranged, penetrating, countercurrent, boiling and fluidization drying of materials are exquisitely and perfectly achieved, more energy is saved, the drying quality is higher, the power consumption of the induced draft fan is lower, and the application prospect is wider.

The invention provides a modular underwater robot, which relates to the field of an underwater robot. The underwater robot comprises an underwater robot main body module, a front module, a rear module, an upper module and a lower module. Each module has an independent function, the main body module is taken as a core, and other modules are communicated with the main body module through a module interface plug and supplies powder. When the usage requirement changes, each module can select different functions for selective replacing according to different application environments and requirements, the repeatability work is greatly reduced, and the design efficiency is increased.

The invention discloses a wind sweeping material distributing box which is modification of preheater material distributing box for traditional cement industry. By guiding air flow of a subordinate preheater cyclone cylinder to the material distributing box, pressure difference in a preheater is utilized to realize material sweeping. A porous air flow distributing plate is mounted on a material scattering platform, air flow distribution is more uniform, material accumulation and bonding on the material scattering platform are improved, and material scattering effect is improved without affecting balance of environments in the preheater. By the wind sweeping material distributing box, the influence, caused by material feed amount change, on a decomposing furnace system can be lowered, material collapsing and blocking of the preheater is relieved, and decomposing effect of materials in the decomposing furnace is improved, and work efficiency of the preheater is improved.

The invention relates to the technical field of battery management, and discloses a battery pack active equalization system based on a super capacitor and a working method thereof. According to the invention, the super capacitor can be used as an electric quantity temporary storage medium, and a high-voltage secondary battery is selected to carry out the constant-current charging of the super capacitor, and thereafter a medium-low voltage secondary battery is selected to receive constant-current discharging from the super capacitor, and therefore the object of active equalization of the battery pack is realized, the electric quantity is ensured to be transferred from high to low each time, invalid charging-discharging circulation is prevented, and the then service lifetime of the battery is hardly affected, and in addition, the DC-DC constant-current charging-discharging technology can be used for ensuring the constancy of equalized current, so that the equalization capacity is not affected by the small pressure difference between the batteries. In addition, only two electric quantity transferring processes are required to complete the equalization of the voltage of the primary battery from high to low, and the equalization efficiency is not affected by the distance between the batteries, and therefore the equalization efficiency is greatly improved, namely the equalization efficiency is about 0.9 regardless of the number of the single batteries.

The invention discloses a single terminal voltage detection method of a series battery pack. The method is integrated with a balanced energy feedback device to rapidly detect the single terminal voltage of the series battery pack, so that the balanced energy feedback device has higher response speed, single batteries of the series battery pack are effectively prevented from being overcharged, the safety of the series battery pack is improved, and application prospects are good. The method comprises the following steps that (1), a controller sends open pulses to predetermined energy feedback units, and a power tube is opened; (2), after the proper time delay, a corresponding multi-way switch is opened, and the terminal voltage of a voltage detection winding is sent into the controller; (3), the controller carries out analog-to-digit conversion, and the terminal voltage of the single batteries are calculated according to a certain proportion.

The invention discloses a hot-air penetration and reversed-current drying machine for tail heat utilization. According to the invention, an air draft hood of a drying machine box body is connected with an induced draft fan, and the induced draft fan is tangentially connected with a cyclone dust removal and efficient tail heat recovery device which is formed by superposing a tubular heat exchanger and a cyclone dust remover, and then is emptied; a shell-pass intake end of the tubular heat exchanger is connected with an air blower, and an exhaust end is connected with an air intake hood via a steam finned heater; and blades of an induced draft fan impeller are arranged to be in a radial shape with impeller-shaft radial and central symmetry, and ash can be timely cleaned by virtue of a centrifugal force, thus security incidents are avoided. According to the invention, drying efficiency is improved, and energy conservation and emission reduction are realized; and more importantly, a detachment technology for the induced draft fan is greatly improved, and a pressure of components such as a nut on the end surface of a shaft shoulder of a screw during detachment for the induced draft fan can be simply eliminated, thus the problem is effectively solved that the induced draft fan is not easy to detach due to continuously automatic locking in thread assembly for the induced draft fan under the action of a load. The hot-air penetration and reversed-current drying machine for tail heat utilization is especially suitable for convenient detachment for a large fan after thread locking, and has a particularly remarkable effect.

The invention relates to a marine life composition for promoting discharge of heavy metals in vivo. The marine life composition comprises the following raw material components in parts by weight: 4 parts to 15.6 parts of seaweed extracts, 0.005 part to 0.2 part of squid ink extract, 0.9 part to 4.9 parts of pectic acid or pectic acid derivatives, 0.4 part to 6.1 parts of xylo-oligosaccharides, and0.09 part to 0.2 part of zinc salt. The marine life composition for promoting the discharge of the heavy metals in vivo disclosed by the invention can widely adsorb all heavy metal ions and promote the discharge of the all heavy metal ions, so that heavy metals accumulated in bones, blood and internal organs can be obviously reduced. Compared with an existing chelating agent medicine, the marinelife composition disclosed by the invention has no toxic and side effects; and moreover, balance of minerals in vivo cannot be affected, and the marine life composition can be securely used for preventing and treating chronic poisoning of the heavy metals for a long time.

The invention discloses a heat pump type tunnel drying device with a baffling dust removal function. A trolley is arranged on a rail of a tunnel, long-shaft fans for internal circulation are arranged in the tunnel, vanes of each long-shaft fan are long-strip-shaped, the section of each vane is in a hollow wedge shape centrosymmetric about the axial radial direction of an impeller, two ends of each vane are inserted into end plates, and each long shaft is fixedly connected with the corresponding end plates through spokes; an air suction hood and an air inlet hood are arranged at two ends of the tunnel adopting a sealed structure, the air suction hood is connected with an induced draft fan, and the induced draft fan is connected with an evaporator of a heat pump system through a dust remover and then emptied; the evaporator of the heat pump system is connected with a main unit, and the main unit is connected with a condenser; an air outlet end of an air blower is connected with the air inlet hood through the condenser; the induced draft fan and the impeller of the long-shaft fans are designed to adopt a hollow symmetric structure and are light, ingenious, solid and durable, and dust cannot be accumulated. Crossflow drying and waste heat recovery of a heat pump are especially suitable for low-temperature drying, nutritional ingredients of thermosensitive substances can be prevented from being damaged, and the system can finish drying, dust removal and heat recovery efficiently at low energy consumption.

The invention provides a spray roasting hydrochloric acid regeneration method and system for ferric oxide powder with a high specific surface area. The method comprises the steps: a waste acid solution is heated and concentrated in a pre-concentrator and then is sprayed into a roasting furnace through a feeding pipeline of the roasting furnace; the generated roasting flue gas is subjected to subsequent regeneration treatment and purification treatment, the waste acid solution is divided into a first pipeline and a second pipeline which are independent before entering the preconcentrator, the waste acid solutions in the first pipeline and the second pipeline respectively enter the roasting furnace and the preconcentrator, and the waste acid solution entering the preconcentrator is heated and concentrated and then is mixed with the waste acid solution in the first pipeline, and then the mixed solution enters the roasting furnace. On the basis of not reducing the treatment capacity of a conventional spray roasting hydrochloric acid regeneration system and not increasing the energy consumption, the waste acid solution is divided into two paths to respectively enter the roasting furnaceand the pre-concentrator, and a certain amount of waste acid is added into the feeding pipeline of the roasting furnace, so that the concentration of the concentrated acid for firing in the roastingfurnace is remarkably reduced, and the purpose of increasing the BET value of the produced ferric oxide powder is achieved.

The invention discloses a tail heat utilization screen hole plate turnover type dryer. Screen hole plate turnover type conveying from top to bottom is adopted in a box of the dryer, and the box of the dryer is divided into an upper drying area, a middle drying area and a lower drying area. The upper drying area is connected with an inducted draft fan through an air heat exchanger and then emptied. A fresh air outlet of the air heat exchanger is connected with an air inlet of an air blower, and an air outlet of the air blower is connected with a steam fin heater in the middle drying area. An impeller of the induced draft fan is of the structure that blades are in a hollow wedge shape, and the contour line of the appearance of the induced draft fan is an involute. Tail heat utilization is simple and reasonable, damp and hot tail gas obtained through heat recovery is exhausted out through the induced draft fan, dried materials are effectively cooled, tail heat utilization is further conducted, and energy saving and emission reduction are promoted. Through the structure that the blades are in the hollow wedge shape, dust is cleaned away in real time, the impeller strength of the fan is increased, stability is increased, safety accidents caused by dust accumulation are effectively eradicated, and the application prospect is wide.