46results about How to "Achieve liquefaction" patented technology

The invention discloses a hydrogen liquefaction process comprising a nitrogen refrigeration cycle, a helium refrigeration cycle and a hydrogen refrigeration cycle. In the technical scheme, liquid helium generated by a liquid helium and air separating device is used as a refrigeration working medium, refrigerating capacity required by hydrogen condensation and liquefaction is provided by the liquid helium, rewarmed helium gas and nitrogen gas are respectively recycled and can be turned into the liquid helium and liquid nitrogen after being processed correspondingly when the refrigerating capacity is provided for the hydrogen liquefaction by the liquid helium and the liquid nitrogen, thus the continuous refrigerating capacity is provided for the hydrogen refrigeration cycle by the helium refrigeration cycle and the nitrogen refrigeration cycle, waste caused by directly discharging the helium gas or the nitrogen gas is avoided, and energy sources are saved. In the intention, operation that any one of the three refrigeration cycles is independent of the other two refrigeration cycles is realized, and heat quantity exchange is carried out among the three refrigeration cycles, thus liquid hydrogen generation is finally completed, and the liquefaction of hydrogen gas is realized by sequentially utilizing the refrigerating capacity of the liquid helium and the liquid nitrogen in the hydrogen refrigeration cycle.

The invention discloses a method for fast producing methane by utilizing excess sludge, specifically comprising the steps of: (1) pretreating excess sludge; (2) alkaline hydrolysis: releasing organic matters in the excess sludge into a water phase through adopting a single-stage alkaline hydrolysis or a two-stage alkaline hydrolysis, wherein the SCOD (Soluble Chemical Oxygen Demand) of the water phase achieves 2000-10000mg/L. (3) production of methane through anaerobic digestion: inoculating 10%-60% by volume of anaerobic granular sludge in an anaerobic reactor, controlling the volume load at 0.30-0.75kg COD/(m<3>.d), performing methane production reaction within 72h, wherein the methane production capacity achieves 200-400mLCH4/gCOD. The method has the advantages that the processes of firstly performing alkaline hydrolysis on the excess sludge so as to enable the organic matters to be liquidified and then performing liquid-state digestion to produce methane are fast to start, short in reaction period, stable in methane productivity, not only can energy be recovered, but also the stabilized treatment of the sludge can be realized, and remarkable and environment benefits can be both achieved.

The invention discloses an oilfield associated gas complete liquefaction recovery system and a method thereof. The system comprises, sequentially connected, an associated gas pretreatment apparatus, a heat regenerator, a first condenser, a gas-liquid separation device, a throttle valve, a second condenser, an LNG storage tank and a regulating valve, the associated gas pretreatment apparatus comprises, sequentially connected, an oil removal device, a dedusting purification device, an acidic gas removal device, a hydration device and a nitrogen adsorption and separation device, the light hydrocarbon outlet of the heat regenerator is connected with the regulating valve, and the lower portion of the gas-liquid separation device is connected with the light hydrocarbon inlet of the heat regenerator. Separating recovery of light hydrocarbons in the oilfield associated gas and liquefaction of natural gas are simultaneously realized by using cold energy provided with above two stage condensing heat exchange devices. The system and the method have the advantages of solving of the recovery problem of remote region oil and gas wellhead associated gas, convenient operation, low cost, high resource recovery rate, no pollution, realization of zero discharge in the oilfield oil extraction process, and obvious resource saving and environment protection effects.

The invention discloses a visual CO2 anhydrous fracturing fluid rheological property test system and test method. The system comprises a CO2 gas cylinder, a piston container and a measuring cup; an outlet of the CO2 gas cylinder is connected with an upper inlet of the piston container, and an upper outlet of the piston container is connected with an inlet of the measuring cup; and a pressure device is further arranged at the bottom of the piston container. The visual CO2 anhydrous fracturing fluid rheological property test system disclosed by the invention has a compact overall structure and simple operation, can complete the measurement work of the rheological properties of CO2 anhydrous fracturing fluid, and can directly measure rheological parameters of carbon dioxide anhydrous fracturing fluid by an experiment; and by setting different temperature and pressure conditions, and adding different types of thickeners with different concentrations, the visual CO2 anhydrous fracturing fluid rheological property test system disclosed by the invention measures the rheological properties of carbon dioxide anhydrous fracturing fluid within a relatively large range of temperature and pressure conditions. At the same time, the visual CO2 anhydrous fracturing fluid rheological property test system disclosed by the invention can accurately control the dosages of the thickener and carbon dioxide, and can observe the mixing situation of the two ingredients in a rotary rheometer in real time, and evaluate the solubility of the thickener in CO2 and the rheological properties of the CO2 anhydrous fracturing fluid by experiments.

The invention relates to the technical field of rapid high-efficiency treatment and utilization and organic fertilizer production of enteromorpha, and discloses a method for rapidly extracting a nutritional ingredient by grinding and liquefying the enteromorpha, and a method for preparing an enteromorpha organic compound fertilizer by performing acid-alkali hydrolysis and concentration on the nutritional ingredient. The method for rapidly extracting the nutritional ingredient comprises the steps of soaking salvaged fresh enteromorpha with fresh water, performing salt and sand removal, performing crushing, performing mechanical grinding, liquefying the enteromorpha, extracting the nutritional ingredient of the enteromorpha, preparing enteromorpha slurry, and performing distillation and concentration in the presence of acid or alkali to obtain the concentrated and hydrolyzed enteromorpha slurry. The method for preparing the enteromorpha organic compound fertilizer comprises the steps of phosphorylating the obtained enteromorpha slurry by a phosphorylating agent, and compounding an inorganic fertilizer to prepare the organic compound fertilizer. A treatment method of the enteromorpha avoids a difficult drying technology, is low in investment, low in cost, high in efficiency and high in capacity, well meets disastrous eruptive enteromorpha environment protection treatment, and eliminates great pollution of large-scale eruptive enteromorpha to an environment.

The invention discloses a marine liquefied ethane vaporized gas re-liquefaction device. The marine liquefied ethane vaporized gas re-liquefaction device comprises an ethane vaporized gas loop and a three-stage compressed mixed refrigerant refrigeration loop. The ethane vaporized gas loop and the three-stage compressed mixed refrigerant refrigeration loop exchange heat through a heat exchanger so that ethane vaporized gas can be liquefied. The ethane vaporized gas loop comprises a BOG compressor. The three-stage compressed mixed refrigerant refrigeration loop comprises a low-pressure refrigeration compressor, a medium-pressure refrigeration compressor, a high-pressure refrigeration compressor, a low-pressure circulation throttle valve, a medium-pressure circulation throttle valve, a high-pressure circulation throttle valve, a medium-pressure gas-liquid separator and a high-pressure gas-liquid separator. A condenser is mounted between the high-pressure circulation throttle valve and the high-pressure refrigeration compressor. A BOG throttle valve and a BOG gas-liquid separator are successively arranged behind the heat exchanger. By the adoption of the marine liquefied ethane vaporized gas re-liquefaction device, the ethane vaporized gas can be recovered and used, and the waste of ethane is avoided.

The invention relates to the technical field of die-casting dies, and discloses a die-casting die with a cooling mechanism and a using method of the die-casting die. The die-casting die comprises a fixed die insert and a movable die insert, the fixed die insert and the movable die insert are connected through a guide rod, and fixing pieces are arranged on the opposite circumferential sides of the fixed die insert and the movable die insert. According to the die-casting die with the cooling mechanism, after high-temperature liquid metal is injected into a die groove, a movable die is rapidly heated, cold water in a water storage cavity is rapidly heated and boiled to generate a large amount of steam, the steam is collected in a gas collection chamber, a separation pipe is used for separating water vapor from water, the water vapor is led into the gas collection chamber, the water flows back into the water storage cavity through through holes in a separator and is discharged through a water outlet, cold water is introduced through a water inlet formed above the bottom of the separation pipe all the time, so that part of water vapor in the separation pipe is liquefied into water when being cooled, and the damage to water cooling equipment caused by the fact that the water vapor and the water are discharged through the water outlet after being rapidly formed is avoided.

The invention relates to the fields of petroleum, chemical engineering and cracking, and particularly relates to a process and a system for preventing excessive cracking. The process has the main characteristics that a plurality of temperature sections are divided according to different temperatures of cracking oil gas, the oil gas generated by cracking is led out of a cracker in time to carry outcooling dust removal, so that the excessive cracking of the oil gas is reduced, the loss of the oil gas is avoided, and the oil yield is increased; the led-out oil gas is subjected to reverse spray by adopting corresponding cooling and refluxing components; the temperature of the oil gas is reduced and dust in the cracking oil gas is removed in a shortest time by control process parameters, so that the maximum liquefaction of high-boiling-point components in the cracking oil gas is realized, the polymerization of unsaturated hydrocarbons in the cracking oil gas is avoided, and the oil yield and the oil-product quality are improved.

The invention provides a post-treatment method of hydrogen sulfide. The method comprises chilling of hydrogen sulfide synthesis gas and backflow of hydrogen sulfide. According to the invention, by selecting a chilling tower, the generation of polysulfide is avoided, the post-treatment step of the polysulfide is simplified, and the liquefaction of sulfur entrained in the hydrogen sulfide synthesis gas can be realized in one step, wherein the purity of the prepared pure hydrogen sulfide reaches 99.95%, and the polysulfide is trace; liquid-state hydrogen sulfide is selected as a low-temperature medium, and other cooling mediums are not introduced, so that secondary treatment is avoided; and in the hydrogen sulfide liquefaction process, released heat can be recycled, and heating and heat preservation of solid sulfur or a hydrogen sulfide reactor, a reaction pipeline and the like are carried out.

The invention belongs to the technical field of enteromorpha rapid high efficiency treatment and utilization, and organic fertilizer production, and discloses a method used for extracting nutrients via pulp refining and enzymatic hydrolysis of enteromorpha, and preparing an enteromorpha organic composite fertilizer from the nutrients. The method comprises follow steps: harvested fresh enteromorpha is immersed in fresh water to remove salt and sand, and is smashed using a large-size waterweed pulverizer; physical pulp refining is carried out using a large-size pulping machine; enteromorpha nutrients are extracted; and enteromorpha is subjected to rapid liquefaction so as to obtain enteromorpha slurry; the obtained enteromorpha slurry is subjected to enzymatic hydrolysis and distillation condensation, phosphorylation is carried out with a phosphorylation agent, and combination of inorganic fertilizers is carried out so as to obtain the enteromorpha organic composite fertilizer. According to the method, fresh enteromorpha is subjected to pulp refining and enzymatic hydrolysis so as to extract the nutrients, so that a difficult drying step is avoided; investment cost is low; cost is low; efficiency is high; capacity is large; enteromorpha environment-friendly treatment is realized preferably; and large environment pollution caused by large scale enteromorpha is eliminated.

The invention discloses a lost foam casting method in the technical field of lost foam casting. The method comprises the following steps: lost foam drawing, mold manufacturing, molding sand molding, jolt ramming, sealing and vacuumizing treatment, formwork elimination, casting mold pouring, waste gas purification treatment, casting post-treatment and molding sand recovery. After a formwork is manufactured, the formwork in a sand mold is heated, the heating lasts for a period of time, the formwork is heated and converted from solid into liquid, formwork liquefying is realized, and the liquefied formwork is discharged from the sand mold, so that the replacement of the formwork is effectively realized, a workpiece cavity is conveniently and quickly formed, and a casting workpiece is conveniently formed by subsequently pouring liquid metal. The heating temperature of the sand mold is increased for a period of time, so that residual liquid formwork raw materials are converted into gas, clean and rapid removal of the formwork materials is achieved, the casting quality of castings can be guaranteed, waste gas can be collected, the mold sand can be recycled and reused, the production cost is reduced, energy consumption is reduced, and the environment friendliness is high.

The invention discloses a method for preparing sugar alcohol ethylation biology liquid fuel, and belongs to the field of fuels. The method includes the following steps: mixing sucrose, mannitol and glycerin; adding sodium hydroxide and monochloroethane for reaction; enabling the mixture after reaction to be subjected to standing; adjusting the pH value of the supernatant, and then adding trichloromethane in the supernatant to obtain ethylation mixed liquor; taking fruits of cornus wilsoniana, and obtaining the bio-oil of fruits of cornus wilsoniana after processes of soaking with n-butyl alcohol, grinding, filtration, and the like; mixing a catalyst prepared from calcium oxide with the bio-oil, so as to obtain hydrocarbon-enriched bio-oil; mixing the ethylation mixed liquor with the hydrocarbon-enriched bio-oil to obtain the sugar alcohol ethylation biology liquid fuel. According to the invention, sucrose, mannitol and monochloroethane (an etherifying agent) is successfully subjected to one-step reaction to realize liquidation of oligosaccharide and sugar alcohol without generating gaseous by-product, besides, the ethylation of glycerin changes fluidity and combustion performance of glycerin, and the bio-oil generated by cornus wilsoniana is added, so that the condensation point of the fuel is reduced.

The invention belongs to the technical field of wastewater treatment and in particular discloses an LED (light emitting diode) chip production wastewater treatment device. Aiming at the problem that the production efficiency is low as operation water discharge is instable and the medicine consumption is large in conventional wastewater treatment, the invention discloses a scheme that the method comprises the following steps: S1, firstly, centrally conveying produced wastewater into a wastewater tank, allowing the wastewater to stand in the wastewater tank to precipitate insoluble substances inthe wastewater, and discharging the wastewater into a reaction tank through a water discharge tube after standing is completed; and S2, putting sodium hydroxide of solid powder into the wastewater tank, and dissolving the sodium hydroxide into the water. Through steps of precipitation, evaporation, condensation, filtration and the like of wastewater, the wastewater can be treated, and the purposeof up-to-standard emission of the wastewater can be achieved; and as each treatment process of the technical scheme is independently operated, dosages can be accurately controlled, a stable water outlet quantity can be ensured, and the production efficiency can be effectively improved.

The invention belongs to the technical field of equipment for the production of alcohol from starchiness raw materials, and particularly relates to an energy-saving liquefaction system for the production of the alcohol from the starchiness raw materials. The energy-saving liquefaction system comprises a mixing spiral conveyer, a primary preheating device, a liquefying preheating system, a steam heating device, a liquefying conveyor pump, a liquefying system, a liquefying mash cooling system, a saccharifying tank, a saccharifying liquid cooling system, a saccharifying liquid cache tank, a saccharifying liquid high-temperature pump, a saccharifying liquid low-temperature pump, a heat exchanger and a tail gas condensation washing discharge device. According to the energy-saving liquefaction system, secondary steam generated in the flash evaporation and cooling process of liquified mash the evaporation and cooling process of saccharified liquid after liquefying the starch raw materials isrecovered, the starch raw materials are preheated by using the recovered secondary steam, temperature rising and pre-liquefying are conducted on the starch raw materials step by step, thus the recovery and reuse of the secondary steam are achieved, the purposes of reducing energy consumption, cooling water consumption, energy conservation and emission reduction are achieved, thus the production cost of alcohol is lowered, and the competitiveness of enterprises is improved.

The invention belongs to a production device and a production process for producing ultra-pure oxygen and liquid nitrogen by adopting a pre-cooling system. The production device comprises an ultra-pure oxygen production system and a liquid nitrogen preparation system, the ultra-pure oxygen production system comprises an oxygen raw material storage tank, and the oxygen raw material storage tank is connected with an ultra-pure oxygen storage tank through a raw material heat exchange unit and a thermal coupling rectifying tower; the liquid nitrogen preparation system and a cooling capacity supply system provide cooling capacity for the raw material heat exchange unit; and the liquid nitrogen preparation system provides cold energy for the thermal coupling rectifying tower and a top condenser at the top of the thermal coupling rectifying tower. The production device has the advantages that the structure is simple, the flow design is reasonable, the upper and lower towers and the circulating refrigeration process are adopted, the occupied area of the device is small, the investment is low, the product is stable, and the liquid nitrogen byproduct can be obtained while the ultra-pure oxygen product is obtained.

The invention discloses an evaporation and concentration system. The system comprises: a first evaporation tank provided with a first steam outlet and a first concentrated solution outlet; a second evaporation tank provided with a second steam outlet and a second concentrated solution outlet; a decompression device; a first heat exchanger connected with the first evaporation tank and located outside the first evaporation tank; a heat source device comprising a compressor unit and an air inlet port, wherein the compressor unit comprises a plurality of compressors arranged in parallel, each compressor is connected with the air inlet port and the first heat exchanger, and the air inlet port is used for distributing a gaseous refrigerant into each compressor to form a heat exchange medium provided for the first heat exchanger; a second heat exchanger connected with the first steam outlet and the second evaporation tank and positioned outside the second evaporation tank; a distilled water tank connected with the second heat exchanger and the second steam outlet; a preheating device connected with the second evaporation tank; and a cooling device. The evaporation and concentration systemis good in use effect.