312 results about "Softened water" patented technology

The invention discloses a high-pressure soft water medium treatment and supply system, which belongs to the technical field of seawater desalination treatment, and comprises a multi-dimensional ion detection module for detecting the concentration distribution characteristics of target inhibition ions in original seawater to generate a corresponding coating material selection instruction; the electric field dynamic coupling module captures a termination signal according to the coating material selection instruction; the shock wave generation module starts a main pump to generate fluid shock waves to execute sediment breaking action according to the termination signal; the monitoring module is used for monitoring the finally output softened water ion concentration and reversely calculating the pollution index of the coating surface; and the heat cycle feedback device is used for starting a self-cleaning mode according to the pollution index and transmitting waste heat in the cleaning process to the pump set. The electric field dynamic coupling adsorption and fluid shock wave cooperative treatment technology is adopted, high-efficiency ion capture, dynamic sediment removal and waste heat recycling can be achieved, energy consumption is remarkably reduced, and continuous and stable operation of the system is guaranteed.

The invention belongs to the technical field of heat pump units, and particularly relates to a high-efficiency middle-deep layer geothermal heat pump unit which comprises a unit body and a heat exchange pipe fixedly communicated to the unit body, and a water temperature sensor is further arranged at the position, corresponding to a water return opening, of the heat exchange pipe. The system further comprises a water softening mechanism, a bactericide supplementing mechanism, a water pressure real-time monitoring feedback mechanism, a water pressure descending speed monitoring feedback mechanism, an alarm grade dividing mechanism, an automatic water supplementing and pressure stabilizing mechanism and a working frequency self-regulating mechanism. Heat exchange water can be automatically softened, the content of ions such as calcium and magnesium is reduced, scaling is prevented, the heat exchange efficiency is maintained, the service life of equipment is prolonged, and cost is reduced; the regeneration frequency of the water softening mechanism and the bactericide adding frequency can be automatically regulated and controlled according to the water temperature, and the softening and sterilizing effects are guaranteed; and leakage of the heat exchange tube can be effectively monitored, graded warning is performed according to the size of leakage points, workers can respond and process in time conveniently, and the fault risk is reduced.

The invention discloses a hardness removal method and system for a sulfate-based mine water concentrated solution, and the method comprises the following steps: sequentially introducing the sulfate-based mine water concentrated solution into a coagulating basin and a flocculation basin for chemical treatment, and allowing the treated mine water concentrated solution to enter a sedimentation basin for standing to obtain softened effluent; wherein lime or sodium hydroxide and a coagulant are put into the coagulating basin, and the coagulating basin is used for carrying out coagulating treatment on the mine water concentrated solution; sodium carbonate, a coagulant aid and an inducer seed crystal are put into the flocculation basin and used for carrying out flocculation treatment and precipitation reaction on the mine water concentrated solution subjected to coagulation treatment, the standing time of the flocculation basin is 14-45 minutes, the precipitation reaction time is 6-30 minutes, and the excessive amount of sodium carbonate is 1.5-2.5 mmol / L. According to the invention, the hardness of calcium in softened water can be lower than 20mg / L.

A water treatment system is provided that includes an inlet in fluid communication with a source of untreated water, where the inlet is in fluid communication with a prefiltration unit. The prefiltration unit is adapted to remove one or more components from the untreated water. A membrane element is in fluid communication with the prefiltration unit and is adapted to remove the one or more components from the untreated water. A permeate stream and a retentate stream are generated by the membrane element. The water treatment system further includes a first treatment vessel that is positioned downstream of the inlet. The first treatment vessel is provided with a first treatment chemical, and the first treatment chemical is adapted to remove the one or more components from the untreated water.

The boiler softened water tank comprises a softened water tank body and a support, the bottom of the softened water tank body is fixedly connected with the support, the left side of the softened water tank body is fixedly connected with a liquid level sight glass, the surface of an emptying pipe is fixedly connected with an emptying valve, the bottom of the right side of the softened water tank body is communicated with a boiler pipe, and the bottom of the boiler pipe is communicated with a vacuum suppressor. The utility model relates to the technical field of boiler softened water tanks, a small liquid level control tank is installed outside the tank, a vacuum suppressor is installed at the top of the liquid level control tank and used for exhausting air when water enters, a floating ball valve is installed in the tank and connected with the softened water tank through a U-shaped bend, and the soft water tank is connected with the vacuum suppressor. The normal temperature is kept, the service life of the sealing piece is prolonged, the sealing piece can be maintained in time without shutdown when damaged and is not influenced by use and hot water in the tank, and the problem that the sealing piece of the floating ball valve is used at high temperature for a long time and is easy to age to cause water leakage is solved.

Systems and methods are described, which relate to internet-of-things (IoT) feedback systems, in which data received from a given IoT device may be analyzed by a controller and used as a basis for controlling another IoT device and / or sending an alert to a user. The controller may activate a dehumidifier upon detecting activation of a sump pump. The controller may monitor water level data and alert a user and / or request maintenance of the sump pump upon detecting the water level exceeds a threshold. The controller may monitor dishwasher data to detect suboptimal performance of a dishwasher, in response to which the controller may instruct valves of a manifold and water heater to close to isolate the dishwasher, and instruct a water softener to elevate salt levels of softened water during a self-cleaning cycle of the dishwasher.

A water system configured for installation in a vehicle comprises a pressure washer, a de-ionization system configured for de-ionizing water, and a water softener configured for softening water. The de-ionization system is in fluid communication with the pressure washer and configured to supply de-ionized water to the pressure washer. The water softener is in fluid communication with a water tank installed in the vehicle and configured to supply softened water to the water tank. A tee junction in fluid communication with the de-ionization system and the water softener routes an inlet feed of water to each of the de-ionization system and the water softener. The water system may include valves for selectively routing water, water filters for filtering water, and a waterproof tray configured to contain the components within a single compartment of the vehicle.

The invention belongs to the technical field of thermal power plant circulating water and sewage pretreatment, and relates to a circulating water lime softening system and method based on seed crystal circulation and intelligent control. Comprising a raw water tank, a lime softening tank, a flocculation reaction tank, a clarification tank and a softened water tank, through the synergistic effect of the seed crystal reflux circulation and the intelligent control technology, the softening efficiency is remarkably improved, the medicament consumption and the sludge output are reduced, and the resource utilization of the calcium carbonate byproduct is realized; according to the system, through organic connection of the raw water tank, the lime softening tank, the flocculation reaction tank, the clarification tank and the softening water tank, accurate adding of lime, sodium carbonate, seed crystal and a flocculating agent is combined, and whole-process water quality on-line monitoring and intelligent regulation and control are matched, so that efficient softening treatment of circulating water blow-down water is realized, stable and up-to-standard effluent quality is ensured, and the quality of discharged water is improved. Meanwhile, the operation cost and the treatment effect are optimized.

The utility model relates to a softened water preparation device, in particular to a softened water preparation device with high hardness removal rate. The utility model relates to a softened water preparation device with high hardness removal rate, which comprises a water inlet pipe, a reaction chamber I, a settling chamber I, a settling chamber II, a reaction chamber II, a settling chamber III, a settling chamber IV, an immersed UF reaction tank, an adjusting chamber, an ion exchange chamber and a water outlet pipe which are sequentially arranged, a sodium carbonate solution adding opening is formed between the settling chamber II and the reaction chamber II.

The invention relates to the technical field of autoclaved aerated concrete slabs, in particular to an autoclaved aerated concrete slab and a preparation method thereof, and the autoclaved aerated concrete slab comprises the following raw materials by mass: 110-120 parts of lime; 140 to 150 parts of cement; 50 to 55 parts of desulfurized gypsum; 9-11 parts of aluminum powder; 8-15 parts of functional particles; 0.15 to 0.25 part of a polycarboxylic acid type water reducing agent; 0.08 to 0.12 part of a citric acid retarder; 0.08 to 0.12 part of a rosin thermopolymer air entraining agent; the hardness of the softened water is lower than 50mg / L. Through innovative design of functional particles and regulation and control of a whole-flow process, collaborative improvement of light weight, high strength, excellent durability and process stability of the autoclaved aerated concrete plate is realized; the problems that strength and density of a traditional product are difficult to balance, durability is insufficient due to weak interface bonding, and process fluctuation is caused by mismatching of gas forming and condensation rhythms are solved.

The utility model relates to an energy-saving and environment-friendly screw type steam compressor testing device, which comprises an air suction filter, an exhaust separator, a heat recoverer, a lubricating oil tank, a softened water tank and a softened water treatment device, an air suction silencer and an air exhaust silencer are respectively arranged on the compressor air exhaust pipe and the compressor air inlet pipe; the compressor air inlet pipe is connected with the exhaust separator through a circulating water spraying pipeline; the heat recoverer is connected with the softened water tank through a condensate pipe and a balance pipe, the softened water treatment device is connected with the softened water tank, and the softened water tank supplements water to the screw type steam compressor to be tested through a softened water supplementing pipe. The steam generation speed of the air dynamic heat engine is increased through the circulating water spraying pipeline, the dynamic heat engine time is short, and meanwhile the power consumption of the driving motor is reduced; the noise reduction effect is good, the noise reduction cost is greatly reduced, and meanwhile, the field working environment of the test device is greatly improved; through the condensation phase change white smoke elimination technology of the heat recoverer, the heat in the steam can be completely recycled.

Method for softening produced oilfield brine for enhanced oil recovery, the method including dissolving gaseous carbon dioxide and a base in a produced oilfield brine that includes divalent ions to yield solid carbonates, filtering the solid carbonates to yield a softened water, and injecting the softened water into a subterranean formation.

The utility model discloses a plate heat exchanger facilitating descaling, and relates to the technical field of plate heat exchangers. Comprising a fixed end plate and a movable end plate, a lower guide beam and an upper guide beam are installed at the upper end and the lower end of the fixed end plate respectively, pressurizing screws are sleeved with the lower guide beam and the upper guide beam, the movable end plate is connected with the fixed end plate through the pressurizing screws, and plate sheets and gaskets are sequentially stacked between the fixed end plate and the movable end plate. A through hole is formed in the plate sheet, and a magnesium rod is installed on the movable end plate. According to the plate heat exchanger beneficial to descaling, the water filter is arranged at the front end of the heat exchanger and can remove various substances such as silt, rust and heavy metal in water, so that the heat exchanger has a certain filtering function to protect normal use of the heat exchanger, meanwhile, the magnesium rod is arranged in the heat exchanger and is mainly used for softening water, and the service life of the heat exchanger is prolonged. The corrosion of scale and acid-base substances in water can be effectively avoided, and the service life of the heat exchanger is prolonged.

The utility model provides a softened water spraying device. The softened water spraying device comprises a water supply tank, a fixed frame, a movable frame, a spraying pipe and a nozzle, according to the softened water spraying device, the water supply tank is arranged, the fixed frame is arranged on the water supply tank, the movable frame which can be adjusted in the vertical direction is arranged on the fixed frame, the spraying pipe is arranged on the movable frame, and the nozzle on the spraying pipe is communicated with the water supply tank. During use, the height of the movable frame is adjusted to enable the spraying pipe on the movable frame to be higher than the conveying belt, the water supply tank is moved to enable the spraying pipe to be located above the water conveying belt, the height of the spraying pipe can be adjusted at will according to different heights of the conveying belt, and meanwhile the position of the water supply tank can be moved according to the position of the on-site conveying belt. And the spraying device can be conveniently added or removed according to field requirements. The device is convenient to operate and can be flexibly used according to a field process, so that cost waste caused by process adjustment is reduced.

The invention discloses an anti-freezing solution suitable for a hydraulic support and a preparation method of the anti-freezing solution, and belongs to the field of mining mechanical engineering and industrial fluid. The water-based cutting fluid comprises the following raw materials in parts by weight: 25-45 parts of an anti-freezing agent, 1-3 parts of an anti-rust agent, 5-10 parts of a nano-composite lubricant, 2-5 parts of an anticorrosive agent, 1-3 parts of a stable buffer agent, 0.1-0.5 part of an acid-base regulator, 0.5-2 parts of a surfactant, 0.02-0.1 part of an anti-foaming agent and 30-65 parts of softened water. Wherein the nano composite lubricant is composed of molybdenum disulfide nanosheets, boron nitride nanosheets and carboxymethyl chitosan, and the mixing mass ratio of molybdenum disulfide to boron nitride to carboxymethyl chitosan is 1: 1: (3-10). The preparation method comprises the step of uniformly mixing the raw materials at 40-50 DEG C to obtain the anti-freezing solution finished product suitable for the hydraulic support. The anti-freezing solution integrating excellent anti-freezing, lubricating, rust-proof and environment-friendly properties is obtained, and the preparation method is simple and suitable for large-scale production.

The utility model relates to a calcined coke waste heat utilization system, and belongs to the technical field of waste heat recovery. The device comprises a first-stage cooler, a second-stage cooler, a waste heat lifting device and a deaerator, and calcined coke is cooled and output sequentially through the first-stage cooler and the second-stage cooler; the first-stage cooling pipe is communicated with the heating medium pipe to form a circulating pipeline, and external softened water is communicated with a second deoxidizing inlet of the deaerator through a first refrigerant pipe; external softened water is connected with an inlet of the second-stage cooling pipe through a second refrigerant pipe, an outlet of the second-stage cooling pipe communicates with a first inlet of the deaerator, and an outlet of the deaerator conveys high-temperature water to the outside. The system is simple in structure, waste heat of calcined coke can be recycled more sufficiently, energy waste is avoided, steam can be heated by the recycled waste heat of the calcined coke, steam cost is reduced, energy is saved, the system is stable and reliable, calcined coke materials with the temperature below 100 DEG C can be output, and energy is saved. And the discharge temperature of the calcined coke is low, so that the requirement on the cooling temperature of the calcined coke material can be met.

The application discloses a flue gas heat energy and condensate water utilization system, which comprises a boiler, a flue gas cooling device, and a deoxygenated water tank. The flue gas generated by the boiler combustion enters the flue gas cooling device through a first flue for cooling. The flue gas exchanges heat with the water in the condensate water tank, the water in the condensate water tank is heated, the flue gas is cooled, and the cooled flue gas is discharged through a second flue. The condensate water formed in the flue gas cooling process falls into the condensate water tank. The water in the condensate water tank is deoxygenated by the deoxygenated water tank and then flows back to the boiler. The flue gas heat energy generated by the boiler combustion is utilized, the slightly acidic condensate water generated by the flue gas is mixed with the slightly alkaline softened water and the boiler water, the acidic condensate water and the alkaline softened water and the boiler water are subjected to acid-base neutralization reaction, the flue gas is used to heat the condensate water, and the like, so that the flue gas condensate water does not contain acidic gas, and thus the flue gas condensate water is slightly alkaline water suitable for the utilization of the boiler.

The utility model discloses a full-automatic water softening device which comprises a salt tank and a resin tank arranged on one side of the salt tank, hoops used for fixing the positions of the salt tank and the resin tank are arranged in the middle of the salt tank and the middle of the resin tank, and a supporting assembly is arranged at the bottom of the salt tank. A positioning assembly used for fixing the position of the hoop is arranged at the end of the hoop. The positioning assembly comprises fixing bases symmetrically arranged at the two ends of the hoop, and the two ends of the hoop are symmetrical. By means of the design of the fixing base, the connecting base, the connecting groove, the limiting piece and the pressing piece, when the end of the hoop needs to be fixed, the connecting base arranged at the end of the hoop directly penetrates into the connecting groove, the position of the connecting base is fixed through the limiting piece, and when the hoop needs to be disassembled, the pressing piece can be pressed by the pressing piece. The connecting seat is directly released through the pressing piece, and disassembly is directly completed, so that installation and disassembly of the hoop are simplified, and the working time of workers is saved.

An air source heat pump and steam boiler combined heat supply system comprises a water treatment system, an air source heat pump, a deaerator, a steam boiler and an induced draft fan, the water treatment system used for desalting and softening water is connected with the water inlet end of the air source heat pump, and the water outlet end of the air source heat pump is connected with the water inlet end of the steam boiler through the deaerator. The air outlet end of the steam boiler is connected with the air inlet end of the air source heat pump. The heat supply system is simple in structure, convenient to operate, flexible and practical, the air source heat pump is embedded in an existing mature steam boiler heat supply system, the waste heat of the smoke at the tail of the steam boiler is further recycled, the overall heat efficiency of the heat supply system is improved, and the heat supply cost is reduced.

1. Name of the designed product: central water softener (2). 2. Use of the designed product: for softening water quality. 3. Design points of the designed product: in shape. 4. Picture or photo that best shows the design points: perspective view.

The application relates to the field of water treatment, in particular to a one-active-one-standby water treatment control system alternating use control method which comprises a first water treatment device for softening hard water and a second water treatment device for softening hard water and alternating with the first water treatment device. The first water treatment device and the second water treatment device of the application alternately produce water, form uninterrupted supply of softened water, one water treatment device produces water, and the other water treatment device is standby, can continuously supply softened water to a water area, and cannot appear the phenomenon that the water production is stopped during regeneration, is automatically controlled, and is convenient to use.

The utility model discloses a novel tower-free rotating film tubular deaerator which comprises a deoxidizing tank, supporting columns are symmetrically arranged at the bottom end of the deoxidizing tank, a fixing plate is arranged at the bottom ends of the supporting columns, a filter box communicated with the deoxidizing tank is arranged on one side of the top end of the deoxidizing tank, a filter assembly is arranged in the filter box, and a water outlet is formed in the other side of the deoxidizing tank. A water inlet pipe communicated with the filter box is arranged at the top end of the filter box, an exhaust port is formed in the side, away from the filter box, of the top end of the deoxidizing tank, a water outlet pipe is arranged at the bottom end of the deoxidizing tank and located between the two supporting columns, and a softened water inlet is formed in one side of the deoxidizing tank. The device has the beneficial effects that water entering the deoxidizing tank can be subjected to impurity filtering by arranging the filtering assembly, impurities are prevented from entering the deoxidizing tank to affect the deoxidizing efficiency of the deoxidizing tank, a limiting assembly in the filtering assembly can facilitate replacement and cleaning of a filter cylinder in a filtering box, and the device is more convenient to use.

The invention relates to the field of oil field steam injection boiler equipment, in particular to a high-capacity subcritical coal-fired CFB type oil field steam injection boiler, the highest pressure of the boiler can reach subcritical pressure, the boiler comprises a steel frame, and a boiler barrel, a hearth water cooling wall and a flue are arranged on the steel frame. A superheater, an upper-level economizer, SCR equipment, a lower-level economizer and an air preheater are sequentially arranged on the flue, a softened water pipeline used for conveying oilfield sewage is arranged on the steel frame, the softened water pipeline is sequentially communicated with the lower-level economizer, the upper-level economizer and a bottom coil pipe of a hearth water cooling wall, and the middle and a top coil pipe of the hearth water cooling wall are communicated with a boiler barrel. A separating assembly used for separating saline water and steam is arranged in the boiler barrel, a steam pipeline is communicated between the top of the boiler barrel and the superheater, the bottom of the boiler barrel is communicated with a salt discharging pipe, and a pressure measuring piece used for monitoring pressure changes in a coil pipe is arranged on the coil pipe of the hearth water cooling wall. The method has the effect of reducing the equipment investment cost.

A dishwasher including: a cleaning chamber; a water tank which stores water in order to supply water to the cleaning chamber; a water softener which is connected to the water tank and to which a filter is mountable; and a regenerator which is connected to the water softener in order to regenerate the filter while the filter is mounted to the water softener, wherein the water tank comprises a softened water chamber that is supplied with water that has been softened in the water softener and stores same, and a recycled water chamber which receives softened water from the softened water chamber and is connected to the regenerator in order to supply water to the regenerator.

The invention discloses an energy-saving optimization control method for an industrial refrigeration system, which adopts a cloud global optimization-edge collaborative execution control architecture, dynamically distributes operation parameters of a refrigeration host unit, a secondary refrigerant circulation unit, a cooling water circulation unit and each unit of a cooling tower by taking the minimum total energy consumption of the system as a target, realizes deep collaboration of the units, and improves the energy-saving performance of the system. According to actual verification, compared with a traditional unit independent control logic, the overall power saving rate of an actual measurement system can reach 23.5%. The anti-icing control module adopts a multi-stage control strategy, so that the system can adopt softened water with low viscosity and high specific heat capacity to completely replace secondary refrigerants such as ethylene glycol, the pumping power consumption is reduced by 12% by directly utilizing the low-viscosity characteristic of water, the COP of a host is improved by about 20% due to the combination of the excellent heat exchange characteristic of water and the efficient heat exchange of the falling film evaporator, and the system reliability is improved. The device is especially suitable for the near freezing point working condition with the secondary refrigerant outlet temperature of 0-2 DEG C.

The pulse steam type dish washing machine comprises a machine body and an adjusting mechanism, the adjusting mechanism is arranged in the machine body and comprises a connecting column, a sliding rail, a connecting shaft, a connecting pipe and a driving part, one end of the connecting column penetrates through the outer wall of the machine body and then is connected with the sliding rail, the connecting shaft is slidably connected with the sliding rail, and the connecting pipe is connected with the side wall of the connecting shaft; the driving part is arranged on the side wall of the machine body. According to the pulse steam type dish washing machine, the adjusting structure is arranged in the machine body, so that stains can be cleaned in all directions when the nozzle cleans tableware, cleaning dead angles are avoided, softened water is vaporized into supersaturated steam through the instantaneous vaporization module, and the cleaning efficiency is improved. And then the continuous steam flow is discretized into a series of pulses by an electromagnetic modulation valve, and the series of pulses are controlled by a pulse modulator to be sprayed out orderly, so that stains on the surface of the tableware are effectively impacted, and the penetrating power and the uniformity of cleaning are enhanced.

The invention discloses a cleaning method and cleaning equipment for a reverse osmosis membrane component. The cleaning method comprises the following steps: S1, checking the cleaning equipment, and preparing a medicament and softened water / pure water; s2, injecting an alkaline agent into a tank body of the cleaning equipment, and carrying out alkaline cleaning work on the reverse osmosis membrane assembly; s3, washing with low-pressure softened water / RO produced water; s4, injecting an acidic agent into the tank body of the cleaning equipment, and carrying out acid pickling work on the reverse osmosis membrane assembly; and S5, washing by using the low-pressure softened water / RO produced water again. According to the cleaning method provided by the invention, through combination of alkali washing and acid washing, organic pollutants and inorganic scaling substances on the surface of the reverse osmosis membrane assembly can be effectively removed, and the water yield and the desalination rate of the membrane are remarkably recovered; by matching with the previous and later flushing steps, the membrane is prevented from being damaged by chemical residues and chemical reactions, so that the service life of the membrane component is prolonged, the operation cost is reduced, and the stability and efficiency of system operation are improved.

1. The name of the design product: double-tank series softener (YYB). 2. The use of the design product: for water treatment, softening water quality. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The invention relates to the technical field of sewage treatment, and discloses a process method for simultaneously removing hardness and turbidity of sewage, which comprises the following steps: S1, raw water pretreatment: raw water enters a pre-sedimentation regulating tank, and large-particle suspended matters are removed through sedimentation and regulation of water quality and water quantity; s2, adding chemicals for softening reaction: adding lime, sodium carbonate or caustic soda into the raw water to enable hardness ions to generate insoluble compounds, and settling the insoluble compounds; s3, filtering by a direct-filtration softening membrane: pressurizing the softened water into a direct-filtration softening membrane system, and filtering to remove residual suspended matters and precipitates; and S4, treating and recycling the effluent, namely directly discharging the effluent according to the purpose, and carrying out advanced treatment. According to the technical scheme of combining dosing softening with a direct filtration softening membrane, hard ions in water are removed by chemical reaction, and water is further purified by physical filtration, so that the purpose of simultaneously removing hardness and turbidity is achieved, the process flow is simplified, the occupied area is small, the installation and operation cost of equipment is reduced, and meanwhile, the treatment efficiency is improved.

The application relates to the technical field of boiler make-up water deoxidation, in particular to a high-efficiency low-temperature deoxidation system. The system comprises a vacuum deoxidizer and a water ring vacuum pump unit, a low-pressure steam pocket is connected with the vacuum deoxidizer through a pipeline, the vacuum deoxidizer is used for removing oxygen in the to-be-processed make-up water, and the deoxidized make-up water enters the water ring vacuum pump unit through a communicating pipeline; a central control unit is connected with the vacuum deoxidizer through a wireless signal, the central control unit is used for setting working parameters of the vacuum deoxidizer; and a monitoring unit is arranged in the vacuum deoxidizer and used for acquiring running parameters of the vacuum deoxidizer. The vacuum deoxidization realizes deoxidization under the condition of a low-temperature water surface (at 70 DEG C or normal temperature), the self-consumption steam quantity of a boiler room is reduced, the vacuum deoxidization can utilize low-grade waste heat, the water can be heated and softened by a jet heater, the deoxidization can be realized in stages and at a low position, the deoxidization is reliable, and the operation is stable.