77results about How to "Increase liquefaction rate" patented technology

The invention discloses a natural gas liquefying system by virtue of double-stage mixed-refrigerant circulation. The liquefying system comprises a precooling cold box, a deep-cooling cold box, a precooling mixed-refrigerant refrigeration circulating mechanism and a deep-cooling mixed-refrigerant refrigeration circulating mechanism. The natural gas liquefying system has the advantages that deep-cooling circulation adopts two-stage refrigeration, so that the refrigerating efficiency is increased; the double-stage mixed-refrigerant circulation is adopted, so that the adjusting range of components of a precooling refrigerant and a deep-cooling refrigerant is wide, and the refrigerant proportioning is convenient; the refrigerating temperature of the precooling refrigerant circulation can be correspondingly adjusted according to the natural gas components and the ambient temperature, the adaptability is strong; in double-stage mixed-refrigerant circulation, the refrigerating loads in two circulations can be reasonably distributed, and the manufacturing of a precooling heat exchanger and a deep-cooling plate-fin heat exchanger is convenient.

The invention discloses a liquefied natural gas (LNG) cold energy air separation system and air separation method. The air separation system comprises an air separation unit, an LNG cold energy utilization unit and an ethylene glycol solution circulating and cooling unit. Through the new process organization form that a circulating liquid nitrogen pump is used for replacing a low-temperature circulating nitrogen compressor, production energy consumption of the LNG cold energy air separation system is substantially reduced, the extraction rate of oxygen and argon is high, the liquefaction ratioof a nitrogen product reaches up to 100%, and the additional value is high; moreover, a liquid nitrogen reverse current cold supplement mode is matched with LNG cold energy changes, and the LNG coldenergy air separation system has fewer requirements for an LNG receiving station and is high in universality. Compared with an existing LNG cold energy air separation technology, the LNG cold energy air separation system and air separation method have the beneficial effects that the comprehensive energy consumption is reduced by 40% or more, and the unit energy consumption is reduced by 60% or more; moreover, the unit energy consumption is still lower than that in the prior art under extreme production reduction conditions, and the cost advantages are quite obvious.

The invention relates to a method for liquefying bamboo wood, which comprises the following steps: a mixed liquefying agent, polymerization inhibitor and acidic catalyst are mixed uniformly, heated to 100 DEG C by heating a reactor, added with bamboo powders, and heated while being stirred to 120-170 DEG C to perform liquefying reaction of bamboo wood. The mixed liquefying agent comprises phenol and a mixture of polyethylene glycol and glycerol. In the liquefying system, the mass ratio of phenol to the mixture of polyethylene glycol and glycerol to the polymerization inhibitor to the acidic catalyst to the bamboo powders is 5-95:95-5:1-4:1-6:20-50. The method for liquefying the bamboo wood has the beneficial effects that the method can be used for liquefying the bamboo wood; the liquefying ratio of the bamboo wood is relatively high; the liquefied product can be widely used, for example for substituting phenol to prepare biobased phenolic resin, for substituting partial polyether or polyester polyol to prepare polyurethane foam, and for preparing a plurality of novel polymer materials such as fiber and carbon fiber, so that the utilization ratio of the bamboo wood is up to 100%.

The invention provides a preparation method for starch-based polyether polyol, belonging to the technical fields of chemical novel materials and high-quality utilization of biomass. According to the invention, starch and a mixed solution of polyethylene glycol 200 and glycerin are used as raw materials, and a reaction is carried out under a hydro-thermal condition so as to prepare polyether polyol; and the prepared polyether polyol has a hydroxyl value of 274.89 to 426.36 mg KOH/g, and the liquefaction ratio of starch is as high as 90.4% (wherein when the hydroxyl value is 331.0 mg KOH/g, viscosity is 430.5 mPa.s). The preparation method provided by the invention uses biomass as a reaction raw material, and biomass is safe, environment-friendly and good in biodegradability and avoids usage of catalysts used in traditional preparation methods; equipment used in the method and operation carried out in the method are simple; and the prepared starch-based polyether polyol can be used for preparation of hard polyurethane heat-insulation materials.

The invention relates to a low-temperature distillation and liquefying separation recovery system and method for coal bed gas high in nitrogen content, oxygen content and hydrogen content. The low-temperature distillation and liquefying separation recovery system is provided with a cold box, a heavy hydrocarbon separation tank, a rectifying tower, an LCPM storage tank, a refrigerant compressor, a cooler, a final-stage gas-liquid separator, a flash gas compressor and a flash gas cooler. The low-temperature distillation and liquefying separation recovery method of the coal bed gas high in nitrogen content, oxygen content and hydrogen content comprises the steps that heavy hydrocarbon separation and liquefaction are conducted on feedstock gas after the feedstock gas is pre-cooled through a pre-cooling section of the cold box; the liquefied feedstock gas enters the rectifying tower for nitrogen removal, oxygen removal and hydrogen removal, and then the liquefied feedstock gas returns into the cold box to be further cooled and then enters the LCPM storage tank; after the gas mixed with refrigerants is compressed and cooled by two stages, the liquid-phase refrigerant separated by the final-stage gas-liquid separator is used for providing cold energy for the pre-cooling section of the cold box; the gaseous-phase refrigerant obtained after separation is used for providing cold energy for the liquefying section and the supercooling section of the cold box; purge gas is heated and then completely exhausted; and flash gas is pressurized and returns to the liquefying section of the cold box to be liquefied again after heat exchange is conducted between the flash gas and the liquid-phase refrigerant. By the adoption of the low-temperature distillation and liquefying separation recovery system and method, the recovery rate of methane can be increased, so that the processing capacity of a device is improved, the energy consumption of the system is reduced, and the production cost is reduced.

The invention discloses a technology for achieving catalytic liquefaction of biomass by means of M(salen) catalytic paper in an ionic liquid, and belongs to the technical field of biomass liquefaction. According to the method, on the condition that the ionic liquid and the M(salen) catalytic paper exist, catalytic liquefaction treatment is conducted on the biomass, wherein M in the M(salen) catalytic paper is Cu or Co or Fe or Mn or Zn. According to the technology for achieving catalytic liquefaction of the biomass by means of the M(salen) catalytic paper in the ionic liquid, the dosage of the catalyst is low, no strict requirement needs to be met, various liquefaction properties can be obviously improved, and the liquefaction efficiency can be obviously improved.

The invention belongs to the technical field of biomass utilization and in particular relates to a method for catalyzing biomass to prepare levulinate by a red mud-based catalyst. A catalyst taking red mud as a carrier is adopted in the invention. With the adoption of the catalyst and a corresponding method in the invention, compared with an ordinary liquefaction method, the method in the invention is nontoxic and low in corrosivity. The operation is simple, the raw material liquefaction ratio is high, and the product is high in yield and purity.

The invention discloses a coal liquefaction system with a forced circulation hot wall reactor and a bubbling bed cold wall reactor. In a coal hydrogenation direct liquefaction reaction process, the forced circulation hot wall reactor is adopted in a shallow coal liquefaction reaction process with a low operation temperature, so that advantages of the existing hot wall reactor manufacturing technology is adopted to realize equipment enlargement and improve the space liquid phase fraction of the reaction; and the bubbling bed cold wall reactor is adopted in a deep coal liquefaction reaction process with a relatively high operation temperature, so that the reaction temperature of a deep thermal cracking process is reasonably improved, and the liquefaction rate of coal can be improved. When the product of the rear bubbling bed cold wall reactor returns to the adjacent upstream forced circulation hot wall reactor and a coupled parallel reaction system is formed, an ideal bubbling bed cold wall reactor with liquid material cyclic high-temperature operation is formed, so that the temperature increase amplitude, of the subsequent flow, caused by overtemperature of the product of the bubbling bed cold wall reactor can be favorably inhibited; a circulating pump can be shared, and two or more of the parallel bubbling bed cold wall reactors can form a non-stop on-line switching operation mode, so that the operation period can be prolonged.