331results about How to "Reduce fouling" patented technology

A band-shaped polarization film (F), which has a protection film extended on one face and a separator extended on the other face, is let off and fed from a film feeding unit (1), and is subjected to a visual inspection. The protection film and the polarization film (F) are then half-cut by a laser device (11) while leaving the separator. After this, the films are transferred and guided to a peeling mechanism (4) so that the polarization film (F) is fed, while the separator being peeled by a knife edge, into an adhering mechanism (5). In synchronism with this feeding action of the polarization film (F), a liquid crystal panel (W) fed from a panel transfer device (18) is transferred and guided to the adhering mechanism (5), and the polarization film (F) is adhered to the liquid crystal panel (W).

A method for removing contaminants from an process stream that includes the use of reticulated material to filter the process stream. The reticulated material also facilitate process stream flow distribution in process units. The reticulated material can be packed with a void space between a substantial number of the reticulated material that can be varied to enhance filtration and flow distribution. The method of filtering also provides a method of removing contaminants leaving process equipment. The methods can be used on a variety of process streams and process equipment. The reticulated material can include ceramics, metallic materials, and chemical vapor deposition elements. The reticulated material can be of various shapes and sizes, and can also be catalytically active.

The invention discloses a technology for recovering production of electrolytic copper and zinc from smelting ash. The technology comprises a step of smelting ash leaching, a step of copper extraction and purification through copper electrodeposition, a step of iron removal through neutralization, a step of cadmium removal, and a step of zinc extraction and purification through zinc electrodeposition. The method is characterized in that chemical components in the smelting ash are analyzed, and the smelting ash is leached by a sulfuric acid solution leaching agent; the leachate obtained after the above leaching reaction undergoes a separation operation of copper extraction and purification through the copper electrodeposition; the resultant copper extraction liquor is neutralized by high-zinc dust which is a neutralizer to remove iron; cadmium is displaced and deposited by zinc powder having a mass same with cadmium after the iron removal through the neutralization; and the zinc extraction is carried out through the zinc electrodeposition by casting zinc ingot products. The technology has a wide adaptability, adopts two steps to complete the exchange reaction of zinc oxide and copper oxide in the raw material with an acid, and adopts the high-zinc dust as the neutralizer, so the massive zinc loss caused by entrainment of routine neutralizers comprising calcium oxide and sodium hydroxide is avoided. A zinc extraction liquor obtained in the above step is purified by N235, so economy and effectiveness are realized.

The invention provides a three-riser pulsating tube bundle. The three-riser pulsating tube bundle comprises a middle riser, a left risers, a right riser and a plurality of coil tubes, wherein each coil tube comprises a plurality of arc-shaped heat exchange tubes, the ends of adjacent heat exchange tubes communicate, the plurality of heat exchange tubes form a series structure, the ends of the heatexchange tubes form free ends of the heat exchange tubes, the inlet of the middle riser is connected with a pulsating flow generating device for generating pulsating flow in the heat exchange tubes,the coil tubes comprise a left coil tube and a right coil tube, one side of the middle riser is connected with the inlet of the left coil tube, the other side is connected with the inlet of the rightcoil tube, the outlet of the left coil tube is connected with the left riser, and the outlet of the right coil tube is connected with the right riser. According to the pulsating tube bundle with the novel structure, more coil tubes are arranged in a limited space to increase the vibration range of the pulsating tube bundle, so that heat transfer and descaling are enhanced.

The invention belongs to the technical field of a limestone/gypsum wet flue gas desulfurization technology, and particularly relates to an additive for strengthening a wet flue gas desulfurization technology, which comprises the following components in percentage by mass: 35-45% of mixed organic acid, 5-10% of organic acid salt, 6-9% of surfactant, 1-6% of heavy metal salt and 35-45% of dirt dispersion agent; and the mixed organic acid comprises adipic acid, wherein the percentage of mass of the adipic acid in the mixed organic acid is not less than 50%. The additive can be added and used for strengthening the wet flue gas desulfurization technology, improve the desulfurization efficiency of a system, reduce the energy consumption, strengthen oxidization, improve the limestone quality and restrain system scaling, and accordingly, the purposes of energy conservation, consumption reduction and waste recycling are realized.

Methods and devices are provided for an energy-efficient distillation system (42). An energy-efficient distillation system (42) can include a fluid inlet (24), one or more heat-yielding purification elements (7, 15, 44) downstream of the fluid inlet (24), one or more heat pipes (6), and a fluid outlet (23) downstream of the heat-yielding purification element (7, 15, 44). The heat-yielding purification element (7, 15, 44) can be, for example, a degasser (7), a demister (15), or an evaporation chamber (44). A heat pipe (6) has a first end operably connected to the heat-generating purification element(s) (7, 15, 44), a second end operably connected to the fluid inlet (24), and a body therebetween. The heat pipe (6) is configured to transfer latent heat energy from the first end to the second end, thereby heating a fluid (8) within the fluid inlet (24). The distillation system (42) can also include one or more descaling elements (21) for reducing scale formation of the fluid (8).

The invention discloses a system and a method for treating water recycled from straw pulp papermaking wastewater. The system is formed by sequentially or respectively connecting a regulating tank, a primary efficient coagulative precipitation tank, a secondary efficient coagulative precipitation tank, a middle water tank, an ultrafiltration membrane treatment device, a reverse osmosis membrane treatment device, an ozone contact oxidation tower, an active carbon adsorption tower, an acid regulating tank, a higher oxidization reaction tank, a neutralizing precipitation tank and a water-producing tank. The system organically combines the coagulative precipitation treatment, the higher oxidization treatment, the ozone catalysis oxidation treatment and the treatment of an ultrafiltration membrane and a nanofiltration membrane, treats the water recycled from the straw pulp papermaking wastewater by using a physical and chemical treatment technology and a shunting treatment and combined effluent treatment process and mode, can ensure that the large scale recycled water of the straw pulp papermaking industry reaches the requirement of reuse water after treated and does not affect a papermaking process and a paper product on the premise of ensuring the low operating cost, and the treated reverse osmosis concentrated water reaches the emission standard of the industry.

The invention provides an advanced oxidation-separate salt crystallization combination system and technique of high-salt-salt industrial wastewater, relating to the technical field of water treatment. The technique comprises the following steps: sending high-salt-salt industrial wastewater treated by a pretreatment membrane system into an ozone advanced oxidation device, and standing in the presence of an ozone catalyst at the ozone specific loss of 1.2-3.0 kg O3/kg COD (chemical oxygen demand) for 2-4 hours, wherein the COD of the treated effluent water is less than 50 mg/L; and sending into a crystallizing system to carry out crystallization treatment, wherein sodium sulfate concentrated water enters a refrigerating crystallizing system, and sodium chloride concentrated water enters a multi-effect evaporation (or MVR (mechanical vapor recompression) evaporation) device. The technique greatly lowers the wastewater COD content, increases the crystal salt purity, has the characteristics of simple operation, low cost, high water treatment quantity, high adaptability and stable water quality, and reduces the blockage problem of the crystallizing equipment.

The invention discloses an orientation membrane pre-curing equipment, comprising a workbench and a heater arranged above the workbench; the heater is an infrared generating device which comprises a plurality of quartz glass far infrared ray heating tubes; wherein, a moving device is connected below the workbench and can drive the workbench to move up and down relative to the heater. The invention arranges the heating device on the upper part of the equipment and uses the infrared generating device to generate infrared so as to achieve panel heating to a substrate which has no contact with the heating device; the substrate has an air layer in the middle and can be evenly heated; besides, the workbench can move up and down; when the heating starts, the workbench has a longer distance from the infrared generating device on the upper part of the equipment, so the substrate is heated by less heat; during the heating process, the workbench automatically rises and is more and more close to the infrared generating device on the upper part of the equipment, so the substrate is heated by more and more heat so as to achieve a gradual increase in heating temperature to reduce the rate of unqualified products caused by uneven heating and improve the product yield.

The invention relates to the technical field of electroplating pretreatment, in particular to a process for carrying out vacuum cleaning, oil removal and wax removal by a modified hydrocarbon cleaner. The process comprises degassing ultrasonic cleaning, vacuum cleaning, vacuum steam flushing, vacuum drying and the like. A plurality of flows are carried out in the vacuum environment with a certain vacuum degree and are matched with a degassing ultrasonic cleaning and vacuum cleaning technology and the modified hydrocarbon cleaner. For the cleaning process, in the whole process, harmful substances of halogen and the like, such as trichloroethylene, methylene chloride, tetrachloroethylene and the like, cannot be used and additional drying equipment is not required. Particularly, the process has excellent cleaning effect on irregular articles with blind holes, joints, gaps, cracks and the like. Meanwhile, the defects of oil removal and wax removal of the conventional process are overcome.

The invention relates to the treatment of industrial wastewater and domestic sewage containing nitrogen, in particular a membrane bioreactor (MBR) which can realize the function of synchronous nitrogen removal of nitrification and denitrification. The reactor comprises a reactor cylinder, a membrane component, spherical elastic filler, dissolved oxygen (DO) electrode, a pH electrode, a thermometer and other on-line monitoring and controlling components. A water production end on an internal membrane component of the MBR is connected with a water production pressure gauge and a vacuum pump. Except the membrane component, the inside of the MBR is also evenly provided with the spherical elastic filler which forms an integer by connecting in series from top to bottom and is fixed on the top and bottom of the reactor. The bottom of the MBR has a micropore aerator connected with an air pump for the aeration utilization of the MBR. The membrane bioreactor introduces the porous spherical elastic filler into the MBR and regulates the micro-environment inside the MBR, so as to realize the function of synchronous nitrogen removal of nitrification and denitrification. The membrane bioreactor has small land occupancy and simple operation, saves energy consumption, can remove a plurality of pollutants of organic matters, ammonia nitrogen, etc., and is applicable to the treatment of industrial organic wastewater, domestic sewage, etc.

The invention belongs to the field of seawater desalination, and particularly relates to a marine heat pipe type seawater desalination device. The marine heat pipe type seawater desalination device is composed of a pressure gage, a liquidometer, heat pipes, a liquid distributor, a baffling plate, a snuffle valve, a cylinder body, a support, a one-way valve, a fresh water pump, a jet flow vacuum pump, a seawater pump, a partition plate, a demister and connecting pipelines. The marine heat pipe type seawater desalination device provided by the invention fully utilizes the advantage that the heat conductivity coefficient of a gravity heat pipe is high, adopts the heat of the cooling water of a ship engine as a heat source, and can greatly reduce the seawater boiling point under the vacuum environment created by the jet flow vacuum pump driven by a centrifugal pump; the seawater is distilled under the lower boiling point, thus the seawater desalination device provided by the invention has the advantages that the manufacture is simple, the structure is compact, the material consumption is less, the dual purposes that the cooling water of the ship engine is recycled and fresh water of a ship body is autarkical are achieved, the maintenance is convenient, the cost is low, the service life is long, and the installation space is small.

A method and device for reducing sulfidation corrosion and depositional fouling in heat transfer components within a refining or petrochemical facility is disclosed. The heat transfer components are formed from a corrosion and fouling resistant steel composition containing a Cr-enriched layer and having a surface roughness of less than 40 micro inches (1.1 μm).

The invention discloses a method for producing an electroplated board edge of a circuit board. The circuit board comprises a board body, wherein an electrostatic discharge guard wire copper-plated layer is arranged on at least one side of the board body. The production method comprises the following steps of: 1) preprocessing; 2) routing; 3) copper depositing; 4) panel electroplating; 5) external circuit pattern transferring; 6) circuit electroplating; 7) etching; 8) intermediate detecting, solder mask and character printing; 9) periphery forming; 10) electrical test and anti-oxidation organic film coating; and 11) checking and packaging. The invention aims to overcome the disadvantages of the prior art and provides a method for producing the electroplated board edge of the circuit board, which has the advantages of high quality, simple process and high performance of plating copper on the side of the circuit board.

The invention discloses a flue gas desulfurization synergist which comprises the following components in percent by weight: 30-80 percent of adipic acid or glutaric acid, 5-30 percent of one of sodium chloride, sodium sulfate, and magnesium sulfate, and 1-50 percent of dioctyl sulfosuccinate sodium salt. A using method of the flue gas desulfurization synergist is characterized by comprising the steps of: firstly, preparing lime into limestone slurry of 50-300PPm, adding 300-1000mg/L of gas desulfurization synergist in the limestone slurry, mechanically stirring uniformly, and then pumping the limestone slurry added with the gas desulfurization synergist into a desulfuration reaction tower by using a limestone slurry pump. By using the gas desulfuration synergist, the desulfuration efficiency is improved by 5-15 percent, the consumption of limestone is reduced, the scale formation and the blockage of equipment are reduced, and the operation electric energy is saved.

The invention provides a method for modifying a Bayer process, processing low-grade diaspore bauxite and producing alumina. The method comprises steps that: (1) silicon is chemically pre-removed, wherein the low-grade bauxite is immersed into a sodium aluminate solution containing a stabilizing agent, such that a slurry containing dissolved silica is obtained; (2) obtained high-silicon sodium aluminate solution is processed through desilication, wherein desilication crystal seeds are added to the slurry processed through filtration, such that desilication is carried out; (3) the sodium aluminate solution is processed through seed precipitation, wherein aluminum hydroxide crystal seeds are added to the sodium aluminate solution processed through desilication, such that seed precipitation is carried out; (4) the obtained aluminum hydroxide product is baked, such that an alumina product is obtained; (5) a high-pressure dissolution process is carried out, wherein the obtained seed precipitation mother liquor is processed through evaporation and alkali supplementation, and is used in high-pressure dissolution of a concentrate obtained in the step (2); a stabilizing agent is added to the obtained sodium aluminate solution, the sodium aluminate solution is then used for processing the next batch of bauxite, and the steps (1) to (4) are repeated. The method provided by the invention is suitable to be used for processing low-grade diaspore bauxite. With the method, a silicon scaling problem in alumina industries can be effectively solved, energy consumption can be substantially improved, and the quality of the finished product alumina can be improved.

The invention provides a water purification system which comprises a concentrated water emission control unit, wherein the concentrated water emission control unit comprises a first branch, a second branch and a wastewater ratio assembly; a water outlet end of the first branch is connected with a water inlet pipeline; the first branch is provided with a first electromagnetic valve; a water outlet end of the second branch is connected with a water outlet section of a concentrated water pipeline or is directly evacuated; the second branch is provided with a second electromagnetic valve; and a water inlet end of the first branch and a water inlet end of the second branch are connected to a concentrated water pipeline between a concentrated water outlet of a reverse osmosis membrane treatment unit and a concentrated water emission electromagnetic valve through the wastewater ratio assembly. The first electromagnetic valve on the first branch and the second electromagnetic valve on the second branch are controlled to open and close intermittently, thereby implementing concentrated water intermittent reflux, reducing the concentrated water emission, and enhancing the recovery rate of the water purification system. The concentrated water reflux is intermittent and controllable, thereby greatly lowering the reverse osmosis membrane pressure and avoiding the shortening of the service life.

The invention discloses a garbage leachate treatment process; a garbage leachate is treated by an adjusting pool, an anaerobic biological treatment unit, a minisize anaerobic-aerobic treatment unit, a membrane bioreactor and an evaporation system (MVC) in turn, and through evaporation, distilled water formed from water and ammonia reaches standards and is discharged after passing through a cation-anion resin exchange system; non-condensable gas reaches standards and is discharged after passing through a deodorization system, and a concentrate is discharged out of the evaporation system; the garbage leachate treatment process is respectively subjected to anaerobic biological treatment, minisize anaerobic-aerobic treatment and membrane bioreactor treatment before evaporation treatment, so as to greatly alleviate the operation burden of the evaporation system (MVC), relieve the fouling problem of the evaporation system (MVC) to a largest extent and reduce the frequency of cleaning; the garbage leachate treatment process is applicable to treatment of conventional high-COD and high-NH3-N garbage leachates, at the same time, is applicable to treatment of leachates with different landfill ages or different types through adjustment of related process parameters, and effectively relieves the burden of process operation.

The invention relates to an anaerobic reactor. The anaerobic reactor comprises a cylinder body, a water inlet pipe, a water outlet pipe, a filling device on the middle part of the water outlet pipe, a water distribution device at the bottom of the filling device and a sludge discharge device at the bottom of the water distribution device; the water distribution device comprises a water distribution main pipe and more than four closed annular water distribution branch pipes; water outlet holes of the water distribution branch pipes are alternately arranged along more than three concentric circumferences; the cylinder body is positioned on the upper part of the filling device; the lower part of each water distribution branch pipe is provided with more than two water outlets; the water outlets are connected with the water outlet pipe; a reflowing pipe of the water outlet pipe is mixed with the water inlet pipe by a circulating pump and is communicated with the water distribution main pipe; a first medicating device and a second medicating device are communicated with the water inlet pipe respectively through connecting pipes; the filling device comprises a filling rack, a membrane hanging rack and a zonal biomembrane strip; the biomembrane strip is hung on the membrane hanging rack; and the sludge discharge device comprises a sludge discharge main pipe and six sludge discharge branch pipes arranged in length alternation along radial direction. The anaerobic reactor has the characteristics of reasonable water distribution, compact structure and stable operation of the reactor.

A method of optimizing system parameters in a crude unit to reduce corrosion and corrosion byproduct deposition in the crude unit is disclosed and claimed. The method includes measuring or predicting properties associated with the system parameters and using an automated controller to analyze the properties to cause adjustments in the chemical program to optimize the system parameters. Adjusting the system parameters effectively controls corrosion in the crude unit by reducing the corrosiveness of a fluid in the process stream and/or by protecting the system from a potentially corrosive substance. System parameter sensing probes are arranged at one or more locations in the process stream to allow accurate monitoring of the system parameters in the crude unit.

The invention provides a pulsed tube bundle heat exchange assembly and a fused salt heat storage tank thereof. The pulsed tube bundle heat exchange assembly comprises coiled tubes, an inlet vertical tube and an outlet vertical tube. The multiple coiled tubes are arranged. Each coiled tube comprises multiple arc heat exchange tubes. The ends of the adjacent heat exchange tubes are communicated, andthe multiple heat exchange tubes form a series-connection structure. A heat exchange tube free end is formed at the end of each heat exchange tube. The inlet vertical tube is connected with an inletof the first heat exchange tube, and the outlet vertical tube is connected with an outlet of the last heat exchange tube. The inlet vertical tube is connected with the inlet of the first heat exchangetub through a pulsed tube. An inlet of the inlet vertical tube is connected with a pulsating flow generation device. The pulsating flow generation device is used for generating pulsating flow in theheat exchange tubes. Pulsating flow is designed in the heat exchange tubes, the heat exchange efficiency can be further improved, the convection heat transfer process outside and inside the tubes canbe enhanced, the time needed for fused salt heat storage can be shortened, and meanwhile the effect of descaling in the tubes can be achieved.

The invention discloses an elliptical tube H-shaped fin heat exchanger for waste heat recovery. The elliptical tube H-shaped fin heat exchanger comprises an elliptical heat exchange tube, a plurality of groups of H-shaped fins and a heat exchanger surface, wherein the H-shaped fins are sleeved on the surface of the heat exchange tube; the heat exchanger surface consists of non-uniform triangular small wings, which are elliptically arranged, on the surfaces of the H-shaped fins around the elliptical heat exchange tube. When dusty flue gas flows through the surfaces of the H-shaped fins, the small wings disturb the fluid to enhance the heat exchange on the tube wall and the downstream side, and meanwhile, the deposition of particles on the tube wall is reduced; the pressure drop can be reduced by the elliptical tube while the particle adhesion is reduced. A plurality of longitudinal vortexes are arranged in a non-uniform manner; at the front and rear edges of the wing, the size of the small wings and the windward attack angle are larger; on the middle parts of the H-shaped fins, the size of the small wings and the attack angle are smaller; by using the device, the heat exchange surface in different flow states can be enhanced respectively, the heat exchange of the fins are effectively enhanced, the pressure drop is reduced, and the deposition of dust particles in the flue gas on the heat exchange surface is reduced, so that the heat exchanger can operate efficiently for a long time in the dusty flue gas.

The present invention addresses the problem of providing technology that is capable of improving the quality of moldings. As a solution, the lower mold (32) is provided with: a lower mold cavity piece (34) for configuring the bottom of a cavity (33); lower mold clampers (35) for configuring the sides of the cavity (33); a film loader (57) capable of holding and conveying a film (F) on which a resin (R) has been loaded; and a suction section (67) for picking up the film (F), which is disposed so as to cover the edges of the lower mold cavity piece (34) and the edges of the lower mold clampers (35). The lower mold cavity piece (34) moves relative to the lower mold clampers (35). The film loader (57) disposes the film (F) on the lower mold (32), in which the edges of the lower mold cavity piece (34) are held level with the edges of the lower mold clampers (35), so that the resin (R) is positioned above the lower mold cavity piece (34). The suction section (67) picks up and holds the film (F) so as to conform to the inner surface of the cavity (33) and supplies the resin (R) to the cavity (33).

The invention discloses an alkali sulphide evaporation concentration system and a method thereof. The system includes a preheater, a compound evaporator, a middle finished product tank, a single effect condensation water preheater, a single effect evaporator, a middle storing tank and a finished product storing tank; a pre-evaporating apparatus is set between the preheater and the compound evaporator, the pre-evaporating apparatus is composed of one preseparator and two alternative pre-evaporator, the pre-evaporator and the compound evaporator are communicated circularly, the pre-evaporator communicates with first high pressure steam. A stock solution heat exchanger and a stock solution flash drum are connected between the pre-evaporator apparatus; another part of the stock solution heat exchanger communicates with a filtering solution storing tank and the compound evaporator. Stock solution forms most scale formation after passing through the pre-separator and the pre-evaporator, then enters into the compound evaporator for evaporating after precipitating, filtering, clarifying and heat exchanging; therefore, the compound evaporator has little scale formation, and period of stopping for scale removal is delayed from 1-4 weeks to after one year.

The invention relates to an electrochemical treatment device and method for degradation-resistant organic wastewater, and designs a'zero polar distance' SPE (Solid Polymer Electrolysis) electrooxidation sewage treatment electrolytic bath like a solid polymer electrolyte fuel cell technology. According to the device, an anode chamber and a cathode chamber are separated by utilizing an ion exchange membrane, the anode with stable titanium-based size, the ion exchange membrane and the nickel cathode are pressed by utilizing an end plate, and a'zero polar distance' SPE electrooxidation sewage treatment electrolytic bath is formed. When the device is subjected to electrolytic operation, the wastewater is electrically oxidized at the anode, so that organic matters and ammonia nitrogen in the water are mineralized and degraded; and running water or the wastewater is introduced into the cathode chamber, and hydrogen separated out due to electrolysis at the cathode is recovered. The device has the advantages that extra supporting electrolyte is not needed to be added, the bath pressure and energy consumption of electrooxidation can be greatly reduced due to the'zero polar distance', and the problem that oxygen (chlorine) and hydrogen separated out in the electrolysis process is solved. In addition, a carbon material is not used, reduction of current efficiency caused by carbon corrosion is avoided, and the reliability and stability of the sewage treatment device are improved. Moreover, continuous water flow is utilized at the cathode, and the scaling and plugging possibility on the cathode side of the ion exchange membrane can be greatly reduced.

The invention provides a baffled regulable ultrasonic/ultraviolet combined disinfection reactor, belonging to the field of sewage and sludge treatment. The device utilizes ultrasonic and ultraviolet combined action, and by utilizing the crushing, cavitation and mechanical shearing action of ultrasonic wave, the particle size distribution state of particulate matters in sewage can be improved, the ultraviolet is forced to kill pathogenic bacteria, so that the ultraviolet disinfection efficiency and stability can be improved. The contact time of water flow and a disinfectant can be prolonged as water flow is baffled to pass through all reaction chambers of the reactor, multistage reaction processes can be formed, and the controllability of reaction processes can be enhanced. Through the technology, the side product risk brought by the disinfection of chemical medicaments can be greatly lowered, the baffled regulable ultrasonic/ultraviolet combined disinfection reactor is especially applicable to disinfection treatment of small and middle-sized sewage treatment plants, the technical operation is simple, auxiliary equipment facilities are not required, so that the baffled regulable ultrasonic/ultraviolet combined disinfection reactor is safe and high-efficiency.

The invention provides a process for preparing quenching oil viscosity breaking agent in cracking fractionator through preparing viscosity breaking agent from polymerization inhibitor and dispersing agent, wherein the weight proportion of the emulsifying agent and the polymerization inhibitor is 1:0.1-10, the emulsifying agent employs de-succinimide prepared from polyisobutylene whose molecular weight is 1000-3000, the polymerization inhibitor is prepared from barred phenolic antioxidant and phosphates anti-oxidant

The invention discloses a zinc oxide desulphurization system comprising an absorption tower, a settling tank, a slurrying tank, an acidifying tank and a sulfur dioxide desorption tower, wherein the absorption tower is provided with an air inlet, an air outlet, an absorption liquid inlet and an absorption liquid outlet; the settling tank is communicated with the absorption liquid outlet; the slurrying tank is communicated with the settling tank, so that absorbent and supernatant liquor are sent to the absorption tower after being stirred; the acidifying tank is connected with a solid-contained slurry outlet of the settling tank; and the sulfur dioxide desorption tower is connected with the acidifying tank. According to the zinc oxide desulphurization system, by the control on the solid content and the pH value of the absorption liquid in the absorption tower, the problems of equipment blockage and scaling are obviously reduced and the absorption efficiency of SO2 is not influenced. In addition, without the discharge of any waste gas, waste liquid and waste solid, fully-closed operation is achieved. The equipment is simple, the operation and the maintenance are convenient and the cost is low; and compared with the traditional zinc oxide desulphurization, the zinc oxide desulphurization of the invention is short in process, convenient to operate and capable of realizing continuous operation.

The invention discloses a negative plate, a preparation method thereof and a lithium ion battery. The negative plate comprises a negative current collector. The negative current collector is coated with negative slurry to form a negative film coating area. At least one side edge of the negative film coating area is coated with insulating slurry to form an insulating film coating area, and the insulating film coating area and the negative film coating area are adjacent or partially miscible. A negative electrode blank area for forming a negative electrode lug is reserved on the edge of one side, far away from the negative electrode coating area, of the insulating coating area. The insulating coating area is positioned at the root of the negative electrode lug. According to the invention, the insulating coating area is additionally arranged on the edge of the cathode coating area, the foil leakage or thick edge bulging of the edge of the negative plate can be prevented. Moreover, the rigidity of the root part of the negative tab can be enhanced, the negative electrode lug is prevented from wrinkling and collapsing, the potential lithium precipitation risk of the battery due to the fact that the negative electrode lug is folded and inversely inserted into the battery cell to be covered with a negative material is avoided, the operability of the process is improved during electrodelug forming, winding or lamination assembly, the defects are reduced, and the production yield and the production efficiency are improved.

The invention provides an evaporative water chiller and a control method, the evaporative water chiller includes: a compressor (1) and an evaporative condenser (2); an air-cooled pre-cooling heat exchanger (8), arranged in the between the compressor (1) and the evaporative condenser (2); a water-cooled precooling heat exchanger (9), arranged between the compressor (1) and the evaporative condenser (2) and connected in parallel with the air-cooled pre-cooling heat exchanger (8). Compared with the air-cooled single pre-cooling method in the prior art, the present invention can increase the water pre-cooling method. Since the power consumption of the water pre-cooling method is smaller than that of the wind pre-cooling method, it is effective in preventing scale of the unit. At the same time, it also reduces the power consumption of the unit and improves the energy efficiency of the unit; at the same time, because the air pre-cooling and water pre-cooling work at the same time to cool the refrigerant, it also effectively improves the cooling and heat release efficiency of the refrigerant and improves the heat transfer of the unit. ability.