107results about How to "Reduce unit consumption" patented technology

The invention discloses a magnesium-based cobalt precipitation agent and a preparation method and application thereof, and relates to the technical field of composite materials. The method comprises the following steps: performing calcination dissociation, enhanced leaching, carbonization separation, efficient pyrolysis, solid-liquid separation, drying and calcination on first magnesium ore to obtain active magnesium oxide; the second magnesium ore is subjected to calcination dissociation, hydration impurity removal, solid-liquid separation and low-temperature calcination, and then high-purity magnesium oxide is obtained; performing series-parallel modification on active magnesium oxide and high-purity magnesium oxide to obtain a magnesium-based cobalt precipitation agent; the mass ratio of the active magnesium oxide to the high-purity magnesium oxide is 1: (2-10), the modifier is quaternary ammonium salt organic powder, and the addition amount of the modifier is 0.02-1% of the total mass of the magnesium oxide. The magnesium-based cobalt precipitation agent prepared through the method is high in activity, has the advantages of being high in efficiency, low in price, low in unit consumption, environmentally friendly and the like in the aspect of nickel and cobalt precipitation through copper-cobalt ore and laterite-nickel ore wet smelting, and can greatly reduce the material cost in the nickel cobalt hydroxide production process.

The invention provides a six-tower multi-effect rectification process and rectification device for crude methanol, and the device comprises a pre-rectification tower, a negative pressure rectification tower, a pressurized rectification tower, a normal pressure rectification tower and a recovery tower which are connected in sequence, the pressurizing rectifying tower and the secondary pressurizing rectifying tower are arranged in parallel, or the secondary pressurizing rectifying tower is arranged between the negative-pressure rectifying tower and the pressurizing rectifying tower, or the secondary pressurizing rectifying tower is arranged between the pressurizing rectifying tower and the normal-pressure rectifying tower; a secondary pressurizing tower reboiler is arranged at the lower part of the secondary pressurizing rectifying tower and is connected with a heat input device; according to the invention, heat of the heat input device is integrated into the rectification system, so that greater energy-saving and carbon-reducing benefits are achieved; a six-tower thermal coupling process is adopted, a heat exchange network is optimized, and the energy-saving space is enlarged; compared with the traditional methanol process, the unit consumption of steam can be reduced; and the methanol with the concentration of more than 99.99% can be extracted.

The invention relates to a beneficiation method for recovering fine-fraction cassiterite from table tailings, and belongs to the technical field of beneficiation. The method comprises the following steps: (1) concentrating by a thickener; (2) grading operation of a cyclone; (3) desliming treatment; (4) flotation desulfurization; (5) magnetic separation iron removal operation; (6) hydrocyclone concentration operation: feeding the iron-removed tailings into a concentration hydrocyclone for concentration to obtain hydrocyclone settled sand and hydrocyclone overflow; and (7) cassiterite flotation operation. According to the method, for fine-fraction cassiterite which is uneven in cassiterite dissemination particle size, poor in monomer dissociation degree and high in iron, sulfur and mud, the technical indexes that the fine tin grade is larger than 35%, the tin-rich middling grade is larger than 2.5%, and the comprehensive tin recovery rate is larger than 65% can be obtained.

The invention relates to the technical field of sintering, and discloses an in-furnace high-permeability efficient sintering process which comprises the following steps: step 1, selecting raw ore; step 2, proportioning raw ore; 3, high-quality lime application; step 4, steam preheating; step 5, sintering process control; and 6, sintering is completed. In the first step, the proportion of small-particle-size raw ore in the proportion is increased to 20%, the compactness and uniformity of a sintered block are improved, combination is easier during sintering, and therefore the strength and stability of a final product are improved, in the second step, the average particle size is controlled to be 5 mm, the particle size smaller than 1 mm is smaller than 5%, and the particle size larger than 3 mm is larger than 65%. The method ensures good fluidity and effective reaction of the material in the sintering process, the moisture content is controlled to 6.8-8%, pulverization is reduced, the strength and stability of the sintered ore are improved, and the beneficial effects of improving the drum strength and metallurgical performance of the sintered ore and ensuring long-period stable and smooth operation of the blast furnace condition are achieved.

The utility model relates to the technical field of engineering blasting, and particularly discloses an underground mine cutting groove smooth blasting blast hole charging structure which comprises a charging cavity containing emulsion explosive and two initiating explosive packages, an orifice air gap, a filling body and a detonator leg wire. The charging cavity is filled with emulsion explosives, two same initiating explosive packages are arranged at the two ends in the charging cavity, an electronic detonator is arranged in each initiating explosive package, detonator leg wires of the electronic detonators are led out of the charging structure of the smooth blasting blast hole of the underground mine cutting groove, and an orifice air gap is formed between the charging cavity and the filling body. According to the blasting hole charging structure for smooth blasting of the underground mine cutting groove, damage to rock mass reserved on the periphery of the cutting groove is effectively reduced, the environmental safety of follow-up ore removal and charging operation of workers is improved, the unit consumption of explosives is reduced, the mining production cost is reduced, and the production efficiency is improved.

The invention provides a whole-process continuous production system for an aliphatic epoxy diluent. The invention further provides a whole-process continuous production process of the aliphatic epoxy diluent. The invention further provides an aliphatic epoxy diluent which is prepared by the production process. According to the full-process continuous production system and process for the aliphatic epoxy diluent, through continuous process design and device optimization, the problems of high labor intensity and large product quality fluctuation in traditional intermittent method epoxy diluent production are effectively solved, the production efficiency and the product quality stability are improved, and the production cost is reduced. And the method has great application value and market competitiveness.

The invention provides a methanol rectification process based on multi-effect thermal coupling and a rectification device thereof. The device comprises a pre-rectification tower, a negative pressure rectification tower, a pressurization rectification tower, a secondary pressure rectification tower and a normal pressure rectification tower which are connected in sequence, the pre-rectifying tower, the pressurized rectifying tower, the secondary-pressure rectifying tower and the normal-pressure rectifying tower are respectively provided with a pre-tower reboiler, a pressurized tower reboiler, a secondary-pressure tower reboiler and a normal-pressure tower reboiler, the lower part of the negative-pressure rectifying tower is provided with a first negative-pressure tower reboiler and a second negative-pressure tower reboiler, and a gas phase extracted from the top of the secondary-pressure rectifying tower provides heat for the pre-tower reboiler; a gas phase extracted from the top of the pressurized rectifying tower provides heat for a secondary pressure tower reboiler and an atmospheric tower reboiler respectively; a gas phase extracted from the top of the pre-rectifying tower provides heat for a negative pressure tower reboiler I; a gas phase extracted from the top of the normal-pressure rectifying tower provides heat for a negative-pressure tower reboiler II; the energy utilization efficiency in the methanol rectification process can be remarkably improved, the production cost is reduced, and the environmental pollution is reduced.

This invention discloses a method for synthesizing cefotiam, using 7-aminocephalosporanic acid (7-ACA) as the parent nucleus and introducing a 4-dimethylaminopyridine-dimethyl carbonate composite catalytic system. The reaction is carried out in a one-pot process involving 3-position nucleophilic substitution, 7-position amidation, and simultaneous deprotection in a green mixed solvent of ionic liquid [BMIM]BF₄-water with 1-(2-dimethylaminoethyl)-1H-5-mercapto-tetrazole and compound I. This method simplifies the process, improves selectivity, produces a high-purity product with stable yield, and is suitable for industrial production.

The application discloses a zinc powder automatic control method, device and system for antimony salt purification process, which comprises the following steps: constructing a copper and cobalt removal fitting model, calculating the optimal potential setting value by using a particle swarm algorithm and setting the potential setting value; updating the potential setting value by using a fuzzy algorithm and a case reasoning method; constructing a three-dimensional fuzzy rule according to the difference between the current potential measurement value and the potential setting value, generating a zinc powder adjustment amount, adding the current zinc powder addition amount to obtain a new zinc powder amount setting value, writing the new zinc powder amount setting value into a DCS system on line, and controlling the automatic feeding device to add zinc powder. The above steps are repeated to achieve stable potential control and realize the minimum zinc powder consumption. The zinc powder automatic control method for the antimony salt purification process, which automatically adjusts the zinc powder addition amount according to the potential fluctuation, realizes accurate control of the zinc powder addition amount, effectively reduces the zinc powder consumption in zinc hydrometallurgy, and reduces the production cost in the antimony salt purification process.

The invention discloses a pre-concentration and sulfur flotation process for high-sulfur magnetite ore, and belongs to the technical field of iron ore beneficiation. Comprising the following steps: 1, crushing and screening the high-sulfur magnetite ore; 2, carrying out first-stage ore grinding-grading on the undersize product; thirdly, sulfur flotation is conducted on the first-section graded overflow product, sulfur concentrate is obtained, and sulfur separation tailings are discharged to enter subsequent iron separation operation; in the step, secondary roughing, secondary concentration and primary scavenging are adopted in the flotation process, middlings are intensively returned to the closed-loop flotation process, and BK 608 and MK 306 are adopted as a collecting agent A and a collecting agent B in the flotation process respectively. According to the method, the reagent unit consumption in the flotation process can be reduced, and meanwhile the effective sulfur grade of the sulfur concentrate is improved.

The present application provides a kind of open-air blasting hole net parameter determination method, device, electronic equipment and detection system, belongs to blasting engineering technical field.The method comprises: S1, obtains the rock mass explosibility parameter of target blast area, initial hole net parameter;S2, the parameters obtained and blasting energy parameters are input into numerical simulation model, and output prediction result;S3, obtains the measured result according to the current hole net parameter execution blasting;S4, according to the measured result and prediction result, corrects the parameters of numerical simulation model;S5, optimizes hole net parameter;S6, based on the iteration control of multi-objective optimization repeatedly executes S2-S5, and the first preset number of iterations control executes S2-S5, subsequent iteration control only executes S2 and S5;Until the prediction boulder rate exceeds the first threshold value, stop iteration, and the optimal hole net parameter with the prediction boulder rate less than the first threshold value is determined as target hole net parameter.The method is used to solve the problem of high explosive specific consumption in related art.

The utility model provides a kettle for dehydration and alcohol removal of dichloroethane, which comprises a reaction kettle, the reaction kettle comprises a kettle body, a stirring mechanism is fixedly arranged at the top of the kettle body, a stirring shaft is fixedly connected with a transmission mechanism through a support rod, the bottom of the transmission mechanism is fixedly connected with a mixing mechanism, the mixing mechanism comprises a connecting seat, a stirring rod and a hydraulic cylinder, the connecting seat is fixedly connected with the bottom of the enclosure, the top end of the stirring rod is rotatably connected with the interior of the connecting seat, and a plurality of uniformly distributed rod bodies are arranged on the stirring rod. The stirring mechanism and the mixing mechanism are arranged in the kettle body and are matched to realize full mixing, and the mixing mechanism can be folded after stirring, so that the mixing efficiency can be improved, the subsequent standing layering cannot be influenced, the production period of dichloroethane can be effectively shortened, the production efficiency is improved, and the production cost is reduced. The dichloroethane recovery solvent is subjected to washing alcohol removal treatment, and the yield of acylation reaction is better stabilized and improved, so that the solvent scrap consumption and the production cost are reduced.

The invention relates to the technical field of coal mill transformation, in particular to a deep peak regulation coping transformation method for a coal mill, which is based on a medium-speed roller type coal mill for transformation and comprises the following steps: replacing an asynchronous motor with a permanent magnet synchronous motor; the gear ratio of an input-stage spiral bevel gear pair of an original planetary reducer is changed, and the output rotating speed of the planetary reducer is increased; the distance between the output shaft of the permanent magnet synchronous motor and the output shaft of the planetary reducer is adjusted, and a permanent magnet speed regulator is installed between the permanent magnet synchronous motor and the planetary reducer; a loading system of the grinding roller is replaced with a reactive force hydraulic variable loading system; and replacing the static separator with a dynamic separator. According to the application, the problem of insufficient output of the coal mill caused by poor coal quality can be solved, and the problem of poor stability and economy of the coal mill when the coal mill runs in a deep peak-shaving low-load mode can be solved.

The application discloses a CO2 blasting intelligent control system and method based on digital twinning and edge computing, which deeply integrates wireless ad hoc network, radio frequency energy activation, edge computing collaborative decision and digital twinning modeling, realizes technical leap from preset triggering to intelligent closed loop, generates personalized parameters based on digital twinning model, combines edge computing real-time sensing and collaborative decision, reduces blasting vibration, improves ore crushing uniformity, reduces secondary crushing energy consumption, and improves blasting accuracy; radio frequency energy activation and electronic safety lock mechanism are adopted to realize zero live standby before detonation, eliminate early explosion risk caused by stray current and misoperation; the operator can complete all operations in a safe area one kilometer away, which essentially improves safety; through the wireless ad hoc network, the disconnection failure of wired connection is eliminated, intelligent collaborative detonation reduces the large block rate, the feedback optimization mechanism continuously reduces the unit consumption of explosives, and the comprehensive cost is reduced.

This invention discloses a stable combustion control system based on a multi-dimensional furnace combustion measurement method, specifically relating to the field of furnace combustion measurement. This includes multi-dimensional sensor data acquisition, feature parameter quantification and extraction, combustion stability modeling, intelligent graded stable combustion control, iterative optimization of control effect, and dynamic evaluation of combustion state. Multi-dimensional sensor data acquisition involves synchronously acquiring data through an array of sensors. Feature parameter quantification and extraction involves preprocessing the acquired data to extract key feature parameters. Combustion stability modeling involves constructing a quantitative evaluation model of the combustion stability index based on the key feature parameters. Intelligent graded stable combustion control involves triggering a three-stage direct injection response mechanism for the fuel gun based on the combustion stability index, combined with an adaptive energy matching algorithm to dynamically adjust the stable combustion energy injection. This invention, through a multi-dimensional sensor array and feature extraction algorithm, achieves advanced identification of early combustion deterioration, solving the problem of lag in single flame detector monitoring.

The utility model provides a crude methanol refining device which comprises a pre-rectifying tower, the pre-rectifying tower is respectively connected with a side line tower and a pressurizing tower, the pressurizing tower is connected with an atmospheric tower, and a pre-tower reboiler, a side line tower reboiler, a pressurizing tower reboiler and an atmospheric tower reboiler are respectively arranged on the pre-rectifying tower, the side line tower, the pressurizing tower and the atmospheric tower. The gas phase extracted from the top of the atmospheric tower exchanges heat with the pre-tower reboiler and the side tower reboiler; gas extracted from the top of the pressurizing tower exchanges heat with a reboiler of the atmospheric tower; the thermal coupling technology of the pre-rectifying tower, the side tower, the pressurizing tower and the atmospheric tower is adopted, a heat exchange network is optimized, the energy-saving space is improved, methanol with the concentration larger than 99.99% can be extracted, and the content of ethanol is 10-200 ppm; according to the method, the original devices such as a pre-rectifying tower, a pressurizing tower and an atmospheric tower are improved, the improvement cost is low, and compared with the traditional methanol process, the unit consumption of steam can be reduced to 0.7-0.8 t steam / t refined alcohol, so that the energy consumption is greatly reduced.

The utility model discloses a decoloring device for calcium aspartate production, and relates to a decoloring device, the device comprises a main decoloring reactor and a secondary decoloring treatment unit, and the main decoloring reactor and the secondary decoloring treatment unit are connected in series for operation through a pipeline system. Wherein the main decolorizing reactor comprises a barrel structure, a feed port is formed in the top end of the barrel structure, a discharge port is formed in the bottom end, and the feed port and the discharge port form a closed loop through an external circulating pump; and the discharge hole is connected to the secondary decolorization treatment unit through a three-way valve in a shunting manner. A mechanical stirring assembly is coaxially arranged in the cylinder, a plurality of inclined adsorption units are uniformly distributed on the periphery of the mechanical stirring assembly in the circumferential direction, and each unit and a stirring shaft form an inclination angle and are spirally distributed in the circumferential direction. According to the decoloring device, a synergistic mechanism of an activated carbon modular carrier and a composite stirring system is constructed, so that the efficient mass transfer characteristic of mechanical stirring is reserved, solid-liquid contact is enhanced by utilizing the micro-disturbance effect of bubbles, meanwhile, direct contact abrasion of activated carbon and moving parts is avoided, and further, the service life of the decoloring device is prolonged. The device can obviously improve the adsorption utilization rate of unit activated carbon.

The invention discloses a dichloroethane refining device, which comprises a light component tower (1), a heavy component tower (2), a vacuum recovery tower (3), a first dichloroethane feeding pipeline (10), a second dichloroethane feeding pipeline (30) and a third dichloroethane feeding pipeline (50), and is characterized by further comprising a first polymerization inhibitor supply pipeline (60) for supplying aromatic nitryl polymerization inhibitors, the outlet end is connected with a second dichloroethane feeding pipeline (30); the second polymerization inhibitor supply pipeline (70) is used for supplying an aromatic nitryl polymerization inhibitor, and the outlet end of the second polymerization inhibitor supply pipeline (70) is connected with the third dichloroethane feeding pipeline (50); and the third polymerization inhibitor supply pipeline (80) is used for supplying a phenol polymerization inhibitor, and the outlet end of the third polymerization inhibitor supply pipeline (80) is connected with the vacuum recovery tower (3). The invention also discloses a dichloroethane refining process applying the dichloroethane refining device. Compared with the prior art, the method has the advantages that heavy component polymerization can be reduced, and the yield and purity of dichloroethane can be improved.

The invention discloses an IF steel RH decarburization final oxygen automatic control method, and belongs to the field of steelmaking production. The method comprises the following steps: controlling oxygen in a converter: adding carbon to control oxygen according to tapping, controlling initial free oxygen before RH treatment to ensure that RH decarburization end point oxygen is in a proper range, removing the carbon adding amount of ejection steel, and executing a carbon adding and oxygen controlling measure in the tapping process; the decarburization efficiency is improved, specifically, after the diameter of the dip pipe with the pipe diameter being 850 mm is expanded, the RH ring flow is increased, so that the decarburization time is controlled, and the decarburization efficiency under the low free oxygen RH condition is guaranteed; the content of free oxygen in the molten steel is monitored in real time, and when it is monitored that the amount of steel ladle carbon removed by the free oxygen in the molten steel is insufficient, the decarburization reaction is promoted in a top lance forced oxygen supply decarburization mode. According to the method, modeling automatic control is achieved by establishing a precise calculation model of steel ladle carbon and free oxygen and calculating the OB oxygen increasing amount and the carbon adding amount, and IF steel RH decarburization end point oxygen can be effectively controlled.

This invention relates to the field of coal washing and processing technology, and discloses a method and computer equipment for integrating a chemical dosing system and a filter press system in a coal preparation plant. The method includes the following steps: the chemical dosing system calculates the target value of the flocculant based on the raw coal quantity and process parameters, and generates the real-time flocculant flow rate by combining turbidity feedback correction. Key parameters are introduced, and the filter press system monitors the concentration pressure, controls operation, and generates an operating sequence. During the low-pressure stage, a follow-up strategy is implemented, using the real-time flocculant flow rate and critical proportionality constant to calculate the target flow rate of the filter aid and adjust the frequency. During the non-low-pressure stage, a feedback strategy is implemented, collecting the effective filter press feeding time according to the operating sequence, comparing it with the standard time, and then performing reverse feedback adjustment to correct the filter aid pump frequency. This invention overcomes the impact of process lag by constructing a segmented closed-loop control logic across systems, achieving dynamic and precise control of the chemicals, improving filter press efficiency and reducing costs while ensuring concentration effects.

The invention discloses a wet dust removal circulating water purification cooperative control method and system based on dust removal load feed-forward compensation. The method comprises the following steps: constructing a multi-source heterogeneous data and dynamic space-time alignment database; establishing a deep learning model, and predicting flux characteristics of future pollutants according to the working condition data of the dust removal system; constructing a hydrodynamic model, and calculating the dynamic time lag of pollutant transportation; and taking the predicted flux characteristics and the dynamic time lag as feed-forward signals, performing cooperative control on agent addition and equipment of the circulating water purification system, and feeding back closed-loop correction based on the effluent quality. Through prospective prediction of the dust removal load and accurate calculation of pollutant conveying time lag, predictive control of the purification system is realized, the problem of response lag of traditional feedback control is solved, the load impact resistance and control precision of the system are improved, the medicament ratio can be optimized, and medicament consumption can be reduced.

This invention relates to the technical field of functional finishing of nonwoven fabrics, specifically to a microcapsule preparation process and a functional finishing process for nonwoven fabrics. The microcapsule preparation process includes the following steps: dissolving bisphenol A in an aqueous sodium hydroxide solution to prepare a mixed solution; dissolving polytetrafluoroethylene emulsion and a water- and oil-repellent agent in a mixed solution of hexamethylene diisocyanate and trichloroethane; slowly and completely adding the mixed trichloroethane emulsion to the sodium hydroxide and bisphenol A mixed solution, stirring thoroughly to ensure uniform dispersion; heating the uniformly dispersed mixed solution to 45-55°C, causing hexamethylene diisocyanate and bisphenol A to undergo a condensation reaction at the particle interface, forming microcapsules with polyurethane as the wall material and a water- and oil-repellent agent as the core material. The microcapsules of this invention, used in the finishing process of nonwoven fabrics, can improve the stability of the treatment agent dispersion, while simultaneously improving the compatibility between components, the water- and oil-repellent properties of the woven fabric, and production efficiency.

The application provides a continuous production device and method for preparing squalane from squalene. The continuous production device comprises a feeding unit, a reaction unit and a separation unit connected in sequence; the reaction unit comprises a liquid-phase hydrogenation reactor provided with a catalyst fixed bed inside, which is used for catalyzing the continuous hydrogenation reaction of squalene raw materials and hydrogen; the liquid-phase hydrogenation reactor adopts gas-liquid countercurrent contact and is provided with a gas-liquid double circulation temperature control system, which is used for circulating and cooling the gas-phase materials and liquid-phase materials participating in the reaction respectively, so as to strictly control the bed temperature distribution; and the device further comprises a three-stage flash evaporation system, which is used for separating and purifying the liquid-phase materials after hydrogenation and recovering the solvent. The application can realize continuous hydrogenation and excellent bed temperature distribution control, and the hydrogen and solvent consumption of the application is low, which can significantly reduce the production operation cost. The application can replace the existing batch kettle reaction process and solve the continuous production problem of squalene for preparing squalane.

The utility model discloses a low-energy-consumption high-quality rice bran steaming system. An outlet of a rice bran articulated chute is connected with an inlet of a rice bran steaming machine through an iron remover, a rice bran cleaning sieve, a scraper conveyor and an elevator; the upper three layers of the rice bran steaming machine are steam steaming layers, the lower parts are a hot air drying layer and an air cooling layer, and the tops of a steam interlayer, a hot air interlayer and a cold air interlayer below each layer are respectively provided with a punching sieve plate; a drainage port of the steam interlayer is connected with a medium-temperature condensate water tank through a water seal, an outlet of the medium-temperature condensate water tank is connected with a hot side inlet of an air-water heat exchanger through a medium-temperature condensate water pump, and a hot side outlet of the air-water heat exchanger is connected with a low-temperature condensate water tank. An outlet of the low-temperature condensate water tank is connected with a top water spraying opening of the rice bran steaming machine through a low-temperature condensate water pump; a cold side inlet of the air-water heat exchanger is communicated with atmosphere, and a cold side outlet of the air-water heat exchanger is connected with an air inlet of the hot air interlayer; an inlet of the cold air interlayer communicates with the atmosphere. The system is low in steam consumption, capable of achieving continuous production and environmentally friendly.

The invention discloses a preparation method of 2, 4-bis (4-alkoxy-2-hydroxyl)-phenyl-6-(4-alkoxyphenyl)-1, 3, 5-triazine, and relates to the technical field of chemical synthesis, the preparation method comprises the following steps: S10, Grignard coupling reaction to obtain a first intermediate of formula (I); s20, carrying out Friedel-Crafts alkylation reaction to obtain a second intermediate as shown in a formula (II); s30, carrying out an etherification reaction, so as to obtain 2, 4-bis (4-alkoxy-2-hydroxyl)-phenyl-6-(4-alkoxyphenyl)-1, 3, 5-triazine of a formula (III) shown in the description; wherein the solvent in the step S10, the solvent in the step S20 and the solvent in the step S30 are the same, and the solvent comprises a urea reagent; r1 comprises hydrogen or a C1-C18 alkyl group; and R2 is a C1-C18 alkyl group. The product obtained by the preparation method provided by the invention has the advantages of fewer solvent residues, fewer impurities and higher product quality.

The utility model relates to a distributed liquid nitrogen cold energy recovery device which mainly comprises an air compression purification system, a heat exchange cold box, a liquid air storage tank, a liquid nitrogen pump and a liquid nitrogen storage tank. The air compression and purification system comprises an air compressor, a freezing dryer and an adsorption dryer; the heat exchange cold box is composed of a main heat exchanger, a flash evaporator and a subcooler, and recovery and utilization of liquid nitrogen cooling capacity are achieved through the components. According to the utility model, the PLC system is used for automatically controlling operation parameters, and the cooling capacity during liquid nitrogen vaporization is used for liquid air production, so that steam required by liquid nitrogen vaporization is saved, and the liquid air production cost is reduced. The device adopts a skid-mounted design, and is small in size, convenient to install and suitable for cold energy recovery of liquid nitrogen dispersion small users.

The invention provides a large prebaked anode production method based on a 26h roasting movement period, which comprises the following steps of: A, preheating a large prebaked anode in a sealed furnace chamber, feeding the large prebaked anode into a 1p furnace chamber, heating the large prebaked anode in the 1p furnace chamber for 26 hours or 52 hours, and then feeding the large prebaked anode into a 2p furnace chamber; b, the large prebaked anode continues to be heated for 26 hours in the 2p furnace chamber and is sequentially fed into furnace chambers in the subsequent heating stage to be heated for 26 hours; c, the large prebaked anode is heated in the X + 1 furnace chamber and then fed into the X + 2 furnace chamber; d, heating the large prebaked anode in the X + 2 furnace chamber, keeping the temperature and staying for 26 hours, and sequentially feeding the large prebaked anode into the subsequent furnace chamber for 26 hours of high-temperature sintering treatment; and E, sequentially feeding into each cooling furnace chamber, cooling for 26 hours, and discharging from the furnace. On the premise of ensuring the product quality and not increasing the energy consumption, the yield is further improved, and the production cost is reduced.

The present invention provides a triple-effect evaporation system and process for evaporating and extracting salt from coking wastewater, wherein the system comprises: a first-effect evaporation device, a second-effect evaporation device, a third-effect evaporation device, a first cyclone, a slurry centrifugal separation device, a gas-liquid separator, a main cooler, and an evaporation concentration condensation device; the evaporation concentration condensation device comprises a preheater and an evaporation condenser; the first-effect evaporation device comprises a first-effect separator, a first-effect heater, and a first-effect circulation pump forming a circulation path; the second-effect evaporation device comprises a second-effect separator, a second-effect heater, and a second-effect circulation pump forming a circulation path; the third-effect evaporation device comprises a third-effect separator, a third-effect heater, and a third-effect circulation pump forming a circulation path. The present invention can realize the evaporation and extraction of salt from coking wastewater, and can prevent calcium sulfate scaling and achieve excellent energy saving in the process of evaporating and extracting salt from coking wastewater.

The utility model discloses a tail gas recovery hydrogen compressor device capable of reducing cost, which comprises a hydrogen compressor (2), a hydrogen pipeline (5) and a nitrogen pipeline (4), the hydrogen pipeline (5) and the nitrogen pipeline (4) are connected with a main filler (24) and a piston rod (26) of the hydrogen compressor (2), and a bridging valve (1) is arranged between the hydrogen pipeline (5) and the nitrogen pipeline (4). The crossover valve (1) can be adjusted to be nitrogen as shielding gas, and the main filler (24) and the piston rod (26) are purged through the hydrogen pipeline (5) and the nitrogen pipeline (4).

This invention relates to the field of catalyst preparation technology, and more specifically, to the preparation and application of a metal catalyst for the production of the rubber antioxidant 6PPD. Copper nitrate and zinc nitrate compounds are dissolved in deionized water, and silicate esters are added and mixed in a water bath. The pH is adjusted, the mixture is aged, filtered, and washed with water to obtain the catalyst precursor. Copper halide is added and stirred until homogeneous, then dried in an oven, ground, and calcined to obtain the metal catalyst for the production of the rubber antioxidant 6PPD. This invention's metal catalyst maintains high activity and selectivity while also being low in cost, exhibiting excellent stability and environmental friendliness. The preparation process is simple, reproducible, and suitable for large-scale production, providing a novel catalytic solution with high industrial application value for the efficient and green synthesis of p-phenylenediamine antioxidants.