369 results about "Dry heating" patented technology

The invention relates to a dry heating protection implementation method for cooking equipment. The dry heating protection implementation method is characterized in that according to cooking types, the working mode of the cooking equipment is divided into at least two different cooking modes, different first dry heating critical temperature points and second dry heating critical temperature points are set for all the cooking modes, under the different cooking modes, the temperature of the bottom of a pot put on the cooking equipment is detected in real time, and when the temperature of the pot reaches the first dry heating critical temperature point under the cooking mode, the cooking equipment reminds a user that dry heating may exist according to current cooking conditions; when the temperature of the bottom of the pot reaches the second dry heating critical temperature point under the cooking mode, the cooking equipment stops heating, meanwhile gives an alarm and reminds the user of dry heating. Compared with the prior art, the mode that according to different cooking modes, dry heating protection can be carried out on different reasonable dry heating protection points improves the cooking experience and cooking safety for the user.

The invention provides a novel electric cooker temperature control assembly which is high in PTC heater heat transfer efficiency and stable in performance.The temperature control assembly comprises a kick type temperature controller, a PTC heater, a support and a heat conduction cover, wherein the upper heat dissipation surface of the PTC heater is tightly attached to the inner top surface of the heat conduction cover, and the kick type temperature controller and the PTC heater are pressed and fixed into the heat conduction cover through the support.The invention further provides an electric cooker using the temperature control assembly.The electric cooker further comprises a heating disc and a liner.A skirt extends outwards from the open portion of the heat conduction cover, an elastic component is arranged on the lower portion of the heat conduction cover, the heating disc is provided with a heat conduction cover installation hole, the heat conduction cover upwards penetrates through the heat conduction cover installation hole, the skirt of the heat conduction cover is sustained by the elastic component so as to be in close contact with the heating disc, and the PTC heater and the kick type temperature controller are connected in parallel and then connected with the heating disc in a power circuit of the electric cooker in series.The electric cooker adopting the temperature control assembly can achieve automatic temperature limitation, heat insulation and dry heating prevention.

A portable warming device for dry heating a towel. The portable warming device includes a heating arrangement that heats one or more surface of the portable warming device so as to heat a towel that is in contact with the one or more heated surfaces. The heating arrangement includes a controller to at least partially control the heating of the towel.

The invention provides an electric water heater water boiling and anti-dry-heating control method, and relates to an electric water heater water boiling and dry-heating judgment and control method. The method includes the following steps that (A) a control circuit board with a micro processor chip as a core is arranged in an electric water heater; (B) two temperature sensors for detecting water temperature are placed in the electric water heater, one is far away from a heating tube, and the other one is near the heating tube, but is not contact with the heating tube; (C) temperatures of two measurement points are detected in real time; (D) the temperature difference of the two measurement points is calculated through a micro processor; (E) the temperature difference is compared with a previous temperature difference to obtain a temperature difference development trend; (F) the temperature difference development trend is judged, if the temperature difference development trend is rising, lowering and mild changing, it is indicated that water is boiling, and accordingly a heating power supply is turned off or a start of needed boiling time is formed, and if the temperature difference development trend is lowering, mild changing and rising, it is indicated that dry heating is to occur, and accordingly the heating supply can be turned off or water is supplemented. In the heating process of water, the dry-heating phenomenon can be truly eliminated.

The invention relates to the field of liquid heating, in particular to a dry heating prevention method of a liquid heating device and a heating device using the dry heating prevention method. The dry heating prevention method comprises the following steps that a temperature sensing part is used for detecting the temperature of the surface of a heating element and then transfers a temperature signal to a control unit, and the control unit calculates a temperature change rate of the surface of the heating element by two or more temperature spots so as to judge the working state of the heating element. Compared with the traditional method for judging the working state of the heating element by a single-spot temperature, the dry heating power-off time is not affected by the response delay of a temperature controller or a temperature sensor, so that the dry heating prevention method of a liquid heating device is more accurate in temperature control and can effectively prevent the heating element from being in a dry heating state for a long time. In addition, the temperature sensing part such as a thermistor or a thermocouple is used for directly detecting the temperature of the surface of the heating element so that the temperature sensing is fast and sensitive; and compared with the traditional metal temperature-sensing piece, the response delay time is greatly reduced so as to prevent the temperature of the heating element from being over-high and prolong the service life of the heating element.

The invention belongs to the field of daily-use ceramic products and particularly relates to a daily-use dry heating resistant ceramic and a manufacturing process. The daily-use dry heating resistant ceramic comprises a dry heating resistant body and a dry heating resistant glaze, the dry heating resistant body and a glaze layer of the dry heating resistant glaze are combined closely, the glaze layer of the dry heating resistant glaze is 0.5-0.8mm in thickness, and the ceramic is capable of withstanding high-temperature open-flame dry heating, resistant to a high temperature above 900 DEG C, extremely low in thermal expansion coefficient, excellent in thermal shock resistance, resistant to more than 30 times of 900-20 DEG C heat exchange without cracking and smaller than 0.003% in water absorption. By regulation of raw material components according to the manufacturing process of the daily-use dry heating resistant ceramic, compactness of the body can be improved, the body is kept intact and closely combined in a glazing process, green body firing is avoided, one-time firing molding is realized, and consequently energy consumption can be reduced by 40% or more, and fuel consumption and fuel cost are reduced while energy saving and emission reduction are significantly benefited.

The present invention discloses an electronic control system of an electric kettle and a control method. The system comprises a signal-processing unit, a signal-collecting unit and a heating unit; wherein, the signal-collecting unit comprises a water temperature detection circuit used to measure the temperature of water and a steam detection circuit used to measure the temperature of steam on thewater surface; the signal-processing unit receives the voltage information representing temperature acquired by the water temperature detection circuit and the steam detection circuit; by judging if the difference between the temperature of the water and the temperature of the steam on the water surface is less than a set temperature difference value or by judging if the temperature of the water detected in a set time interval is constant, the signal-processing unit transmits a control signal to the heating unit in order to control the electric on-off of the heating unit, thus realizing the automatic regulation of the temperature of boiled water under different environmental pressures in order to meet the requirement on boiled water judgment in different areas; the arrangement of a dry heating protector ensures that when heating elements heat until the temperature of the dry heating protector reaches 105 DEG C to 111 DEG C, the heating elements can be automatically cut off in order toprotect the electric kettle.

The invention discloses an energy-saving compressed air drying method and an energy-saving compressed air drying device special for compression heat regenerative pipelines. The method comprises the following two stages: a drying-heating regeneration stage, wherein high temperature gas is delivered to a regenerator, enters an air cooler for temperature reduction, flows into a gas-water separator and then enters a drying tower; and a drying-cold blowing regeneration stage, wherein the high temperature gas is controlled by a valve to change the direction, flows into the air cooler and the gas-water separator and then directly enters the drying tower for drying, wherein partial dried air taken from an outlet of the drying tower enters the regenerator for cold blowing regeneration. The device comprises a pair of adsorption towers which are formed by connecting a plurality of control valves and pipelines and is a drying tower and a regenerator mutually; the control valves are connected with a PLC program controller; a pipeline for delivering high temperature air is connected in parallel with a dry air supply pipeline formed by connecting the air cooler and the gas-water separator in series; and the front end of the dry air supply pipeline is connected with an outlet of a regenerative gas pipeline of the regenerator through a control valve. The energy-saving compressed air drying method and the energy-saving compressed air drying device avoid the defects of short switching time, high frequency and high gas consumption for generation of a heatless regenerative adsorption type drier, also overcome the defect that a heat regenerative adsorption type drier needs a heater to consume much electric energy, and ensure continuous production of high-quality gas and energy conservation.

The invention discloses a method for preparing a freeze-dried human blood coagulation factor VIII. The method comprises the following process of: dissolving by taking water for injection, comprising 3-10 IU (International Unit) / ml of heparin, as a heparin sodium solution and cryoprecipitating; performing PEG (Polyethylene Glycol) precipitation and taking supernatant; performing centrifugal filtration; performing S / D (Solvent / Detergent) inactivation at the temperature of 24-26 DEG C; performing DEAE (Diethylaminoethyl) Sepharose Fast Flow chromatographic column balance, adsorption, washing andelution; performing molecular membrane ultrafiltration; preparing, removing bacteria, sub-packaging, freeze-drying and capping; and dry-heating at the temperature of 99.5-100.5 DEG C and inactivating. In the invention, the process method of combining the PEG precipitation and an ion exchange chromatography technology is adopted; the method is easy and convenient to operate; the F VIII active recovery rate is increased; miscellaneous proteins can be removed on a large scale; the product yield reaches over 60 percent; and the specific activity of the product reaches 5 IU / mg and is obviously greater than a value which is not less than 1 IU / mg stipulated in the pharmacopeia. Meanwhile, the PEG residue is 0.08g / L which is obviously less than the value which is less than or equal to 0.5 IU / mg stipulated in the pharmacopeia, so that Al<3+> residues in the final preparation of an Al(OH)3 gel method are avoided; the product has high purity and high safety; and the quality of the final product is obviously improved.

The invention discloses a method for preparing functional extracellular polysaccharide of lactic acid bacteria, which is characterized by comprising the following steps of: inoculating a Lactococcus lactis subsp. lactis strain fermentation agent for culture, performing ultrafiltration concentration, precipitation and ethanol extraction on fermentation liquor, centrifuging a precipitate, and performing freeze drying to obtain powdery crude extracellular polysaccharide; performing separation and purification by using a diethylaminoethanol (DEAE) cellulose ion exchange column and SepharoseCL-6B gel column chromatography in turn, desalting, performing ultrafiltration concentration, precipitating by using an ethanol solution, and performing freeze drying on a precipitate to obtain pure extracellular polysaccharide; and performing phosphorylation and selenide formation on the pure extracellular polysaccharide. The method has the advantages that: the extracellular polysaccharide produced by the Lactococcus lactis subsp. lactis strain is subjected to selenide formation and phosphorylation modification by a dry heating method, and the functional extracellular polysaccharide of lactic acid bacteria with obvious antioxidant and immunity enhancing effects is obtained.

The invention relates to a preparation method of a high-gelling-property soybean protein / beta-glucan compound, belonging to the technical field of soybean protein processing. The method comprises the following steps: (1) mixing oat beta-glucan with water to form a beta-glucan solution, and adding soybean protein isolate into the solution to obtain a soybean protein / beta-glucan mixed solution; (2) carrying out high-pressure microjet homogenization treatment on the mixed solution, adding transglutaminase into the homogenized mixed solution, and carrying out ultrasonic assisted enzyme crosslinking treatment; and (3) dialyzing the mixed solution subjected to enzyme crosslinking treatment, concentrating, drying to obtain dry powder, and carrying out dry heating treatment on the dry powder to obtain the soybean protein / beta-glucan compound. The method combining the high-pressure microjet homogenization technique and the ultrasonic assisted enzyme crosslinking technique is applicable to preparation of the soybean protein / beta-glucan compound, and the dry heating processing technique is used as a synergic means, thereby improving the gelling property and gelling stability of the soybean protein / beta-glucan compound and widening the application range in food.

The invention discloses a method for preparing low-sensitivity soybean protein powder by combination of glycosylation and enzymatic modification. The method comprises the following steps: firstly uniformly mixing soybean protein with a glycosyl donor in a certain mass ratio and then dissolving in distilled water, freezing and drying in vacuum, and putting the mixture at certain humidity and certain temperature to prepare a soybean protein glycosylation product; subsequently performing proper hydrolysis by use of a compound enzyme consisting of alkaline protease and flavorzyme, and then centrifuging and drying to obtain the low-sensitivity soybean protein powder. The method disclosed by the invention has the advantages that firstly, a soybean protein product prepared by the method disclosed by the invention is relatively low in antigenicity, so that soybean anaphylaxis can be reduced or eliminated; secondly, by adopting a conventional dry heating method, the preparation method is relatively simple in process, free of pollution and safe; thirdly, the method is combined with an enzymolysis method, so the reaction time is shortened and the product is free of bitter taste and other smelly flavors; finally, active substances which are easy to digest and absorb and have the functions of enhancing the immunity and reducing blood pressure can be generated during the preparation process.

The invention provides a method of preventing dry heating of an electric kettle and an electric kettle, wherein the method comprises: detecting temperature of a heating tube of the electric kettle in preset time intervals, and calculating temperature rise value according to the temperature of the heating tube; judging whether dry heating occurs to the electric kettle according to an average of the preset number of temperature rise values continuously calculated; if yes, controlling the electric kettle to stop heating. Dry heating prevention is achieved in electronic manner by the method and the electric kettle according to the technical scheme response speed is high, and errors in dry heating prevention judgment can be decreased.

Provided is a method of protecting archives with red-ink handwriting from spreading and sinking in during process of papering and repairing. The method comprises the steps of uniformly mixing, by mass, 1 part of phospho-tungstic acid, 2.3 to 3.9 parts of phosphoric acid, 48.8 to 52.0 parts of acetone and 2.8 to 9.2 parts of tetraeththyl orthosiliate to prepare a first reinforcing agent and coating the agent on red-ink handwritings; preparing a second reinforcing agent with 1 part by mass of ethyl cellulose, 6.25 parts by mass of barium hydroxide and 40 parts by mass of methanol and coating the agent on the red-ink handwritings coated with the first reinforcing agent; and preparing a third reinforcing agent with, by mass, 1 part of ethyl cellulose banana oil solution and 0.03 to 0.17 part of polymethylmethacrylate banana oil solution, wherein mass percentage of the ethyl cellulose banana oil solution is 4% and mass percentage of the polymethylmethacrylate banana oil solution is 4%, and coating the third reinforcing agent on the red-ink handwritings coated with the second reinforcing agent. The method of protecting the red-ink handwritings enables improvement in tensile strength, folding strength and tearability of testing paper after dry heating aging, hydrothermal aging and ultraviolet aging tests. After the aging process, the handwritings which are reinforced by the reinforcing agents exhibit minor chromatic aberration. Pigments of the handwritings are not easy to fade and the handwritings can be durably kept.

The invention discloses a solar heat pump water heater, which is provided with a solar vacuum heat collector tube explosion preventing module, a water tank antifreezing protection module, a water tank anti-dry heating protection module, a water tank anti-overflowing protection module, a connecting tube antifreezing protection module, a heat pump automatic operation module, a heat pump economic operation module and a lightning protection module. In the water heater, multiple functions are integrated, the requirements of users are taken into consideration fully, various accidents are prevented, the normal operation of the water heater is ensured, the solar is fully utilized, the electric energy is saved and the environment is protected.

The invention relates to zero-loss internal recycle type gas purifying method and device, which use regeneration adsorbing drying towers for high temperature gas discharged by a compressor or obtained by heating the low temperature gas. In a period, one tower is taken as a drying tower while the other one is used as a regeneration tower. The method comprises the following two stages: the first stage is drying-heating regeneration stage: the high temperature gas enters the regeneration tower, then enters a post-positioned water cooler to lower the temperature, then flows to a post-positioned oil-water separator and enters the drying tower to be dried; and the second stage is drying-cold blowing regeneration stage: after the first stage is finished, a PLC controller sends a command; the direction of the high temperature gas is changed under control of a valve, and the high temperature gas firstly flows to a pre-positioned water cooler and a pre-positioned oil-water separator; partial cooled gas still enters the regeneration tower for cold blowing while the rest is mixed with the gas entering the regeneration tower for cold blowing through the valve, and the mixture enters the post-positioned water cooler and the post-positioned oil-water separator for deep cooling, then enters the drying tower to be absorbed to produce dried gas. The invention has the advantages of simple and reliable method, convenient use, energy saving and the like.

The invention discloses a fast disinfecting and drying device for stuffed toys. The fast disinfecting and drying device for the stuffed toys comprises a spray disinfecting box, a dry disinfecting box, a conveying guide rail, travel guide rails, conveying slide blocks, rotating motors, mechanical claws, travel motors, bristle brush rollers, a disinfectant box, atomizing water sprayers, a recovery filtering box, a delivery pump, a delivery pipe, reshaping disinfecting bristle brush rollers, a dry heating wall, an air intake fan, a suction fan and an air filter. By adoption of the fast disinfecting and drying device for the stuffed toys, the stuffed toys can be directly disinfected, disinfection is thorough and complete, operation is convenient, the disinfecting efficiency is high, and application and popularization of the stuffed toys under production are facilitated.

The invention provides an air conditioning system which comprises an outdoor heat exchanger (5), an indoor first heat exchanger (14) and indoor second heat exchangers (13), wherein the indoor second heat exchangers (13) are arranged at the two ends of the outdoor heat exchanger (5) through first parallel branches in parallel, and meanwhile the indoor second heat exchangers (13) are also arranged at the two ends of the indoor first heat exchanger (14) through second parallel branches in parallel. The air conditioning system further comprises a first control valve system for controlling the first parallel branches, and a second control valve system for controlling the second parallel branches is arranged on the second parallel branches. According to the air conditioning system, the heat exchangers are reasonably arranged, and heat of condensation is utilized to replace electrical heating, so that the waste of thermal resources and the possible thermal pollution are reduced, the cost of electrical heating is reduced, and the potential safety hazard of possible dry heating caused by electrical heating operation is avoided; meanwhile, the heat exchange area is increased, and the sensible heat ratio of the air conditioning system during operation is increased. The invention further relates to a control method for the air conditioning system.

The invention provides a high-frequency vacuum wood drying method and high-frequency vacuum wood drying equipment. The drying method comprises the following steps that wood is clamped between a positive electrode plate and a negative electrode plate, heating parameters in the wood drying heating stage are set, an electron tube lamp filament is preheated, positive voltage is exerted onto an electron tube anode, the process starts to enter the heating stage, anode current and grid electrode current are automatically turned step by step until the anode current reaches the set range, whether the anode current is changed or not is judged, if the anode current is changed, the anode vacuum variable capacitor is automatically regulated so that the anode current is maintained in the set range, if the anode current is not changed, the wood is continuously dried until the set drying time is reached, and the wood drying is completed. The anode to grid electrode ratio is maintained in the set range, the anode current and the grid electrode current are automatically regulated step by step, the regulation is precise, and the real unattended operation is realized.

The invention discloses a gas stove control method and a gas stove. The gas stove control method comprises the steps of acquiring a detection temperature of the bottom part of a pan body; calculatinga temperature change rate of the bottom part of the pan body according to the detection temperature, wherein the temperature change rate reflects rangeability of the detection temperature in a time period; comparing the temperature change rate with a first preset temperature change rate; when the temperature change rate is smaller than or equal to the first preset temperature change rate, acquiring a water-cooking drying-heating temperature corresponding to the current detection temperature; and when the detection temperature of the bottom part of the pan body is larger than or equal to the water-cooking dry-heating temperature, turning off the gas stove. According to the technical scheme provided by the invention, the setting accuracy of the dry-heating temperature is improved, and dry-heating is effectively prevented.

The invention relates to a burning system, in particular to a double-ring burning system used for protecting against dry heating. The double-ring burning system comprises a burner provided with a fuel gas channel, a fire shield seat arranged on the burner, an outer ring fire shield arranged on the annular fire shield seat, a temperature sensor arranged at the center of the burner, and an inner ring fire shield that is arranged on the burner and used for protecting the temperature sensor; a round through hole is arranged at the center of the inner ring fire shield, an annular fuel gas chamber that is separated with the through hole is arranged outside the through hole, a gas inlet that is communicated with the fuel gas channel is arranged at one end of the fuel gas chamber, and at least one circle of inner burning orifices are arranged on the outer wall of the fuel gas chamber and communicated with the fuel gas chamber. The invention provides the double-ring burning system used for protection against dry heating, can eliminate the influence of inner ring fire on the temperature sensor arranged at the center of the burner, can improve the heating capability of the burner, and can simultaneously avoid the problems of overproof carbon monoxide and inner ring yellow flame caused by the air insufficiency of the inner ring fire.

The invention provides a sitting type constant-temperature and constant-pressure washing device for urinary surgery. The sitting type constant-temperature and constant-pressure washing device for the urinary surgery comprises a bottom board, a seat body, a constant-temperature device, a constant-pressure device, a washing device, a drying device and a recovery device. The seat body is arranged on the upper surface of the bottom board, the constant-temperature device, the constant-pressure device, the washing device, the drying device and the recovery device are arranged in the seat body, the constant-temperature device comprises a temperature sensor and a heating pipe which are located in the liquid storage box, the washing device comprises a negative pressure pump and a washing head, the drying device comprises drying heating wires, and the recovery device comprises a waste liquid box. The sitting type constant-temperature and constant-pressure washing device is simple in structure and convenient to use, and the constant-temperature device is arranged, so that comfort of a patient is guaranteed; the constant-pressure device is arranged, so that the enough washing intensity is guaranteed; the height of the seat body and the position of the washing head can be adjusted, so that the device is suitable for different patients; the drying device is arranged, waiting time is shortened, comfort of the patient is guaranteed, and the work difficulty of medical staff is reduced.

The invention discloses a shellfish flavor peptide and a preparation method thereof. The method comprises the following steps: using pinctada martensii and Corbicula fluminea as raw materials, and beating; rinsing by using a NaCl solution and filtering to obtain protein; conducting glycosylation: dispersing the protein into the NaCl solution to let the protein uniformly mix with glucan in a proper weight ratio, then conducting freeze drying and dry heating to obtain glucan shellfish protein; conducting enzymatic hydrolysis: adding water in the glucan shellfish protein, adjusting the pH value and the temperature, adding papain and composite protease to conduct enzymatic hydrolysis, after completing the enzymatic hydrolysis, killing enzyme to obtain an enzymoiysis product; carrying out centrifugal filtration on the enzymoiysis product to obtain an enzymatic hydrolysis solution; fermenting to remove fishy smell: carrying out autoclaved sterilization on the enzymatic hydrolysis solution, cooling, inoculating lactic acid bacteria, fermenting to obtain a broth; carrying out ultrafiltration on the broth by using a 5000Da ultrafilter membrane and drying to obtain the flavor peptide. The shellfish flavor peptide prepared by the invention has rich nutrients on the basis of keeping the original taste and guarantees the food safety.

The present invention relates to a liquid-solid rolling bonding method for heterogeneous metals and an apparatus therefor. The method comprises: pouring a liquid metal onto the surface of a heterogeneous solid base metal coated with a soldering flux; rolling the liquid metal and the solid metal under pressure; solidifying the liquid metal and making it bond to the surface of the solid base metal under rapid cooling to realize metallurgical bonding of the two or more metals. The apparatus comprises an unrolling machine, a soldering flux tank, a drying-heating apparatus, a pouring nozzle, an interior water-cooling rollers and a roll-collecting machine arranged in order, a pouring basket is disposed above the pouring nozzle and a base frame is disposed below the pouring nozzle. The present invention has the advantages of high bonding strength, lower production cost, high production efficiency, good product quality, fewer investment for the apparatus and lower consumption of energy. The method of the present invention can replace the convention rolling bonding method in solid-solid phase and is suitable for the production of various clad metal sheets and strip.

The invention relates to a coke drawing and drying method for industrial production of needle coke. The coke drawing and drying method is characterized by comprising the following steps: carrying outdelayed coking on coal tar fractions or petroleum fractions as a coking raw material from a pretreatment section by main equipment of two furnaces and three towers; respectively and continuously feeding the coking raw material into the three coking towers by a coking heating furnace; carrying out alternate circulated operation on the three coking towers. When raw materials heated by the coking heating furnace are switched from a first coking tower to a second coking tower, drawn coke and drying oil which are heated by a coke drawing and drying heating furnace are introduced into the first coking tower for drawing coke and drying, and the three coking towers carry out alternate circulated operations. According to the coke drawing and drying method disclosed by the invention, a two-furnace and three-tower industrial production flow is adopted, i.e., one coking heating furnace always heats the raw materials for the three coking towers, and the other coke drawing and drying heating furnaceheats the drawn coke and the drying oil for the three coking towers; the properties of the materials heated by the two heating furnaces are always consistent; the coke drawing and drying method has the advantages that the operation is simple and stable, coke drawing and drying are sufficient, and the quality and the yield of a product are improved.

The invention discloses a secondary ettringite type expanding agent and a preparation method and application thereof. The preparation method comprises the following steps of: stirring a pozzolanic material, a calcium material, plaster and water, forming into a blank or spheres, naturally curing, performing dry heating curing in a curing cell for 0.5 to 10 hours, raising the temperature to 100-170DEG C, and keeping the temperature for 0.5 to 10 hours for dehydration and ettringite decomposition reaction, or standing the formed blank or spheres for 2 to 10 hours, curing under steam pressure, and dehydrating for 0.5 to 10 hours, or dehydrating the thermally synthesized aluminosilicate material and wastes thereof at the temperature of higher than 100DEG C for 0.5 to 10 hours; and mixing and grinding 60 to 95 weight parts of material and 5 to 40 weight parts of anhydrous gypsum, or respectively grinding 60 to 95 weight parts of material and 5 to 40 weight parts of anhydrous gypsum and uniformly mixing to obtain powder of which the specific surface area is more than 200m<2> / kg, namely the secondary ettringite type expanding agent. The secondary ettringite type expanding agent can endow mortar and concrete with micro-expansion property, and improve the volume stability of the mortar and concrete.

The invention relates to a water-temperature-adjustable three-water-outlet water purifier extension set and a control method thereof. The extension set comprises a water inlet electromagnetic valve, awater purifying tank, a heating water tank, three two-in-one draining electromagnetic valves and an electric control device, wherein the water inlet electromagnetic valve is connected with an external purified water source; a high liquid level probe and a low liquid level probe are mounted in the water purifying tank; and a heating pipe, an anti-dry-heating controller and a temperature sensor aremounted in the heating water tank, the water purifying tank and the heating water tank are correspondingly connected with the three two-in-one draining electromagnetic valves through pipelines, and the top of the heating water tank is communicated with the bottom of the water purifying tank through a water inlet pipeline. According to the water-temperature-adjustable three-water-outlet water purifier extension set, hot water or warm water is selected by opening cold or hot electromagnetic valves in the two-in-one draining electromagnetic valves, the water temperature of hot water in the heating water tank is within a set range, and the temperature fluctuation is very small, so that the bacteria breeding can be inhibited; and water at multiple temperatures can be obtained, and can be simultaneously discharged by virtue of three water outlet nozzles.