45results about How to "Reduce corrosion loss" patented technology

The invention discloses a frostless air source heat pump device and method based on membrane method dehumidification and indoor regeneration humidification. The frostless air source heat pump device comprises a refrigerant circulation loop and a solution dehumidification/humidification circulation loop. The refrigerant circulation loop comprises a compressor (1), a four-way reversing valve (2), an indoor heat exchanger (3), a regeneration condenser (4), a throttling valve (5) and an outdoor heat exchanger (6) which are sequentially connected together in series through a first communication pipeline. The solution dehumidification/humidification circulation loop comprises a heat recovery heat exchanger (10), a regeneration condenser (4), an indoor humidification membrane assembly (11), a heat recovery heat exchanger (10), an outdoor dehumidification membrane assembly (7) and a dehumidification solution storage tank (8). According to the frostless air source heat pump device and method based on membrane method dehumidification and indoor regeneration humidification, outdoor air latent heat is converted into sensible heat through the dehumidification membrane assembly, frosting is avoided, and moisture introduced through a dehumidification solution is regenerated and used for indoor humidification.

The invention provides a method for removing fluorine, chlorine and valuable metals in secondary zinc oxide, which solves the problems of low removal rate, high energy consumption, low environment friendliness and low economical efficiency in the prior art. According to the method, high-fluoride/chloride secondary zinc oxide used as a raw material is granulated, aired and subjected to rotary kiln roasting, flue gas is settled and subjected to dust collection, the roasted product is subjected to indirect water cooling, and a mixed air heating process is adopted by using natural gas as a heat source, thereby removing the fluorine, chlorine, lead and indium and implementing reenrichment of indium, lead and other valuable metals. The roasting process is utilized to remove most of fluorine, chlorine, lead and indium; the lead and indium are enriched in the roasted dust, thereby solving the problem of later processing of the high-fluoride/chloride secondary zinc oxide; and the method has the advantages of fewer required technical processes, high efficiency, smooth procedure, high degree of mechanization and the like, and greatly enhances the environmental and economic benefits.

The invention discloses a control method for cathode protection of high-voltage direct-current transmission grounding electrodes. Improvement is performed on the basis of a direct-current transmission project constant current control manner, according to forward current detection results of the grounding electrodes, first-electrode current value deviation changes to be positive and negative alternately, alternate cathode protection of the sending end and receiving end grounding electrodes is achieved, corrosion losses of the grounding electrodes are reduced, the service life of the grounding electrodes is greatly prolonged, and the problem that the grounding electrodes are seriously corroded due to unbalanced current and the like is solved. The existing high-voltage direct-current transmission project constant current control manner is used, the manner is finely adjusted, the investment cost of a control protection system is not increased, the corrosion losses of the grounding electrodes can be greatly reduced, the service life of the grounding electrodes is prolonged, and the control method can be applied to a practical high-voltage direct-current transmission project.

The invention relates to the synthesis and application technology field of compounds used for metal anticorrosion, and concretely discloses a novel rosin imidazoline corrosion inhibitor, a synthetic method and applications. The initial raw material of the provided compound is rosin acid, the raw material is single and the synthetic route operation is simple. The method for preparing a corrosion inhibitor from the synthesized compound is simple, the compound is dissolved in dimethyl formamide, then the obtained solution is dissolved in water, then 1-hydroxyethylidene-1,1-diphosphonic acid is added, and uniform stirring is carried out. The corrosion inhibitor is safe and environmentally friendly, and has excellent corrosion inhibition effects. The corrosion inhibitor can be used for oil and gas field ground gathering and storage and transportation pipes, prevents damage of corrosive gases to metal materials of steel and the like and reduces corrosion loss.

The invention discloses preparation of a wastewater treatment agent and an application method thereof. At present, extensive attention of researchers is paid to a heterogeneous Fenton technology in the field of organic wastewater treatment. Due to low cost and high catalytic activity, nanometer pyrite has excellent application potential in the heterogeneous Fenton field. However, separation and recovery of the nanometer pyrite from a liquid phase need to use ultrafiltration, nanofiltration and other high-energy-consumption means, and the cost is high; the nanometer pyrite Fenton system is lowin effluent pH value and high in iron content, and has relatively high environmental risk. By virtue of the fixation effect of sodium alginate gel on nanometer pyrite grains and the cross-linking effect of sodium alginate molecules and iron ions, the wastewater treatment agent with advantages of being easy to separate and low in cost is prepared in the invention. The agent prepared in the invention has the advantages that the defect that the nanometer pyrite is difficult to separate is effectively overcome, and the environmental risk of the nanometer pyrite is weakened. By adopting the wastewater treatment agent prepared in the invention and the application method thereof, organic wastewater can be effectively treated, and the agent has wide application prospects.

The invention relates to a canned pear and a preparation method thereof. The preparation method comprises the following pear peeling steps that (1) an alkaline solution with a concentration of 4-18% (by weight) is prepared by mixing sodium hydroxide and/or potassium hydroxide, and adding a peeling activator containing fatty acids and/or tallates to the alkaline solution to obtain an alkaline peeling liquid; wherein the adding amount of the peeling activator is 0.1-1% (by weight) of the alkaline solution; (2) the to-be-peeled pear makes contact with the alkaline peeling liquid; wherein the temperature of the alkaline peeling liquid is controlled at 55-75 DEG C. The method can quickly peel the pear at relatively low temperature without or less hurting the pear flesh, and the initial color and flavor of the peeled pear can be well preserved.

The invention discloses a device for painting make-up of the bottom of a ship during sailing of the ship. The device comprises a hull, a fixing block is arranged on the hull, a penetrating cavity penetrating in the left-right direction is formed in the upper surface of the fixing block, a first motor is fixedly arranged in the front wall of the penetrating cavity, the rear end of the first motor is in power connection with a motor shaft, a rotating block is fixedly connected to the motor shaft, a through cavity is formed in the front surface and the rear surface of the rotating block in a penetrating mode, the right end of the rotating block is fixedly connected with a connecting block, a gear cavity is formed in the upper side inside the connecting block, and a first rotating shaft with the left end stretching into the through cavity is arranged in the left wall of the gear cavity in a penetrating mode. Painting make-up operation can be conducted on the ship bottom of the ship in long-distance sailing, the situation that painting make-up cannot be completed due to the fact that the ship cannot reach a shore is avoided, the corrosion loss of the hull is reduced, meanwhile, the safety of the hull is improved, the whole operation process is simple, operation is convenient, and the device is very practical and worthy of being popularized.

The invention discloses a corrosion method of a germanium gallium arsenide (GaAs) single crystal dislocation pit and a corrosion solution formula, which relates to the technical field of chemistry process. The method comprises the following steps: polishing an observation surface comprising a to-be-detected GaAs{100} wafer with a crystal orientation deflection angle in a preset deflection angle range,and to obtaining the to-be-detected wafer; preparing a mixed solution of hydrofluoric acid, hydrogen peroxide and deionized water according to a preset ratio as a corrosion solution, and placing the corrosion solution in a corrosion trough; placing the corrosion trough in a water-bath pot with an ice-water mixture, and keeping the temperature of the corrosion solution in the corrosion trough at 3 to 8 DEG C; starting a light source, and enabling the light to shine on the bottom of the corrosion trough; and placing the to-be-detected wafer on a hollowed base, placing the hollowed base in the corrosion trough, enabling the to-be-detected wafer on the hollowed base to be in an illumination range of a cold light source in the corrosion trough, soaking the to-be-detected wafer with the corrosion solution, and reacting for 30 to 50 minutes. By adopting the corrosion method, the breaking of the wafer in the corrosion process can be avoided, and the corrosion amount can be reduced.

The invention provides an efficient heat transfer tube of a heat exchanger for recycling smoke waste heat, which consists of an inlet header, a vertical serpentine pipe, a spike tooth rib column which is provided with annular grooves and arranged obliquely, and an outlet header. The heat exchanger mainly solves three problems: 1, the vertical serpentine pipe is adopted to reduce wearing speed; 2, the spike tooth rib column is arranged obliquely to make dust in the smoke fall naturally; and 3, in order to increase the heat exchange area to a large extend and increase the disturbance of the smoke and the residence time in a flue, the spike tooth rib column is provided with two annular grooves. The invention reduces a part of wear, prevents dust accumulation, and increases the heat transfer area, and the method is simple, is easy to implement, can significantly prolong the service life of the heat exchanger of a waste heat boiler, reduces the volume of the waste heat boiler and saves materials.