167results about How to "Improve liquefaction efficiency" patented technology

The invention belongs to the field of natural gas low temperature liquefied technology, and relates to a liquefied natural gas (LNG) three-level low temperature liquefied process device and a mixed refrigerant refrigeration technology, which cools 6.0MPa, -120DEG C natural gas into -164DEG C to be liquefied in two-steam spiral wound tube type heat exchanger by applying a certain proportion of non-azeotropic N2-CH4 mixed refrigerant, thereby being convenient for LNG to be stored in a surpercooling mode and being convenient to transport. The non-azeotropic N2-CH4 mixed refrigerant is firstly precooled and liquefied by a three-level refrigerant spiral wound tube type heat exchanger, and is throttled to a shell pass after being liquefied to cool a LNG tube bundle and a N2-CH4 mixed refrigerant precooling tube bundle from a secondary outlet in -120DEG C, thereby leading natural gas and precoolded refrigerant in the tube pass to be liquefied, and achieving the purpose of precooling mixed refrigerant before throttling and liquefying nature gas at low temperature. The LNG three-level low temperature liquefied process device is compact in structure and high in heat exchange efficiency, can be used to exchange heat for mixed gas with low-temperature phase transition, solves the difficult problem of LNG three-level low temperature technology, and increases low temperature heat exchange efficiency of a LNG system.

The invention relates to a liquefaction system and a liquefaction method for NG (Natural Gas). The system comprises a cold box, a supply pipe for supplying the NG to the cold box, a No.1 refrigerant liquefaction subsystem, a No.2 refrigerant liquefaction subsystem, a No.1 refrigerant cooling subsystem, a No.2 refrigerant cooling subsystem, a heavy hydrocarbon separation tank which is used for conducting gas-liquid separation to liquid heavy hydrocarbon and gas light hydrocarbon, and an LNG (Liquefied Natural Gas) storage tank which is used for storing LNG obtained through liquefaction, wherein the cold box comprises an NG precooling passage which is connected with the heavy hydrocarbon separation tank and is used for supplying the NG; an NG deep cooling passage which is connected with the LNG storage tank and is used for supplying the gas light hydrocarbon; a No.1 refrigerant precooling passage and a No.2 refrigerant precooling passage which are used for respectively supplying and cooling high-pressure No.1 refrigerant and high-pressure No.2 refrigerant which are respectively supplied by the No.1 refrigerant liquefaction subsystem the No.2 refrigerant liquefaction subsystem, and are used for respectively supplying the cooled high-pressure No.1 refrigerant and the cooled high-pressure No.2 refrigerant to the No.1 refrigerant cooling subsystem and the No.2 refrigerant cooling subsystem; and a No.1 refrigerant cooling passage and a No.2 refrigerant cooling passage which are used for respectively supplying low-temperature No.1 refrigerant and low-temperature No.2 refrigerant which are respectively supplied by the No.1 refrigerant cooling subsystem and the No.2 refrigerant cooling subsystem to cool the NG, high-temperature No.1 refrigerant and high-temperature No.2 refrigerant. By adopting the technical scheme, the complexity and the energy consumption of the system can be reduced.

The invention discloses methods for a straw liquefied coating liquid and a coated controlled-release fertilizer. The preparation method of the coating liquid comprises the steps: mixing straw, a liquefying agent, an acidic catalyst and a surfactant, carrying out a reaction, and removing a residue in the reaction system, to obtain a filtrate which is a straw liquefied product; and then carrying out a mixing reaction of the straw liquefied product with polyether polyol, an alkaline catalyst and an auxiliary agent, and thus obtaining the straw liquefied coating liquid. The preparation method of the coated controlled-release fertilizer comprises the steps: preheating fertilizer granules, then simultaneously atomizing the straw liquefied coating liquid and a curing agent onto the surface of the fertilizer granules, to obtain the straw liquefied coated controlled-release fertilizer. The coated controlled-release fertilizer provided by the invention utilizes compounding of heteropolyacid and inorganic acid to catalyze liquefaction of a straw powder; while the alkaline catalyst in the straw liquefied coating liquid is used for acid-alkali adjustment of the straw liquefied product, the in-situ reaction speed is accelerated, and thus the controlled-release characteristic of the coated controlled-release fertilizer is improved.

The invention discloses an internal combustion heating movable-bed biomass-pyrolysis liquefaction device which includes a reactor (7); the inside of the reactor is provided with an internal combustion pipeline (5); both the inlet and the outlet of the internal combustion pipeline (5) are arranged outside the reactor (7); a hopper (1) is arranged above the reactor (7); a blanking control valve (2) is arranged on the hopper (1); a rotary shaft (6) is arranged in the center of the reactor (7); conical hoppers (4) are arranged on the rotary shaft (6); conical material dividing umbrellas are arranged between the conical hoppers (4); the material inlet of the hopper (1) is arranged above the conical hoppers (4); a pyrolysis gas outlet (20) is arranged on the reactor (7); the bottom part of the reactor (7) is provided with a slag discharge opening (14); a cyclone separator (23) is connected on the gas pipeline of the pyrolysis gas outlet (20); the flue gas outlet of the cyclone separator (23) is connected into a condenser (26); an oil outlet and an outlet for non-condensable gas are arranged on the condenser (26); the outlet for non-condensable gas is connected to a gas buffer tank (28) through a draught fan. The biomass-pyrolysis liquefaction device reduces the liquefaction cost of bio-oil, has a simple structure and a low processing and manufacture cost as well as is simply and conveniently operated, managed and maintained.

The present invention provides an iron-based catalyst and a preparation method thereof. The catalyst comprises an active ingredient, a structure additive and a catalyst carrier, the active ingredient comprises FeOOH, the structure additive includes MnO (OH) 2, the MnO (OH) 2 is added to separate and disperse the FeOOH for ultimate formation of the FeOOH with very small size. The FeOOH with smaller particle size is combined easily with S for conversion into an active phase Fe1-xS. The iron-based catalyst can be nearestly and rapidly reacted with coal, catalytic pyrolysis and hydrogenation of coal macromolecules can be promoted, and the efficiency of coal liquefaction is improved. The iron-based catalyst has better dispersion and stability, as well as higher activity of direct coal liquefaction.

The invention belongs to the technical field of low-temperature natural gas liquefaction, and relates to LNG (liquefied natural gas) secondary low-temperature liquefaction equipment and the technique of refrigeration by mixed refrigerant. C2H4 refrigerant and N2-CH4 mixed refrigerant steam of 0.3MPa and -130 DEG C from an LNG three-level outlet are used for cooling and liquefying natural gas of 5.8MPa and -53 DEG C in a three-stream spiral wound type heat exchanger, so that LNG can conveniently enter a three-level undercooling stage. The three-stream spiral wound type heat exchanger for secondary liquefaction is used for undercooling the C2H4 refrigerant first, the undercooled C2H4 refrigerant is throttled to a shell side to be mixed with the N2-CH4 to cool a -53-DEG C LNG pipeline, a N2-CH4 precooling tube bundle and a C2H4 undercooling tube bundle, so that undercooling of the C2H4 and precooling of the N2-CH4 and liquefaction of natural gas are realized. The equipment is compact in structure and high in heat exchange efficiency, and can be used for the field of phase-variable low-temperature heat exchange of gas at temperature ranging from -53 DEG C to -120 DEG C, the problem of LNG secondary low-temperature liquefaction is solved, and low-temperature heat exchanging efficiency of an LNG system can be improved.

The timber liquefying method is to mixing timber with solvent in the presence of acid catalyst and under timber liquefying condition, with the timber accounting for not less than 30 wt% of the 1 wt% concentration water solution of NaOH as the extractant. The present invention has mild timber liquefying condition, reduced solvent consumption, greatly reduced liquefied residue rate, environment friendship and other advantages. The timber liquefying product is used for preparing adhesive, foamed polyurethane plastic, molded phenolic plastic and other polymer material.

The invention belongs to the technical field of low-temperature liquefaction of natural gas, and relates to multi-flow spiral winding tube type main heat exchange equipment with mixed refrigerant for low-temperature liquefaction of LNG (liquefied natural gas) and refrigerating technology of mixed refrigerant. Natural gas at the temperature of 36 DEG C and pressure of 6.1MPa is gradually cooled to the temperature of minus 164 DEG C and is overcooled by the aid of mixed refrigerant consisting of N2, CH4, C2H4, C3H8, C4H10 and isomerized C4H10 via a three-stage refrigerating process, the N2, the CH4, the C2H4, the C3H8, the C4H10 and the isomerized C4H10 are gradually overcooled by a multi-flow spiral winding type heat exchanger and are respectively throttled, a natural gas tube bundle and a mixed refrigerant tube bundle are pre-cooled, and purposes of primary precooling of the natural gas, secondary liquefaction of the natural gas and tertiary overcooling of the natural gas are achieved. The multi-flow spiral winding tube type main heat exchange equipment is compact in structure and high in heat exchange efficiency, and can be used for the field of phase-change low-temperature heat exchange of gas at the temperature ranging from 36 DEG C to minus 164 DEG C, technical difficult problems in terms of low-temperature liquefaction of the LNG are solved, and low-temperature heat exchange efficiency of an LNG system is improved.

Provided is a method for producing liquefied natural gas by multi-component refrigerant two-stage compression. The method includes two multi-component refrigerant compression cycles, the refrigerant in a first cycle is called a pre-cooling refrigerant, the refrigerant in a second cycle is called a cryogenic refrigerant; the pre-cooling refrigerant returns to an ice chest after passing through a pre-cooling compressor, a cooler, a buffer tank, the ice chest, a throttle valve and a gas-liquid separation tank, and then returns to the pre-cooling compressor; the cryogenic refrigerant returns to the ice chest after passing through a cryogenic compressor, the cooler, the ice chest, the throttle valve and the gas-liquid separation tank, and then returns to the cryogenic compressor; and natural gas is cooled after heat transfer of the ice chest and the refrigerants and finally becomes the liquefied natural gas. The natural gas is liquefied by two independent multi-component refrigerant compression cycles, and composition and content of the two multi-component refrigerants are different, so that the method is wide in application range to raw material natural gas, high in operation flexibility and high in liquefying efficiency. Besides, the method is simple in liquefying process, low in investment cost, and is applicable to liquefied natural gas factories in various scales.

The invention relates to a dual-refrigerant liquefaction system and a dual-refrigerant liquefaction method for NG (Natural Gas). The system comprises a cold box for liquefying the NG, an NG supply pipe, a No.1 refrigerant external treatment subsystem, a No.2 refrigerant external treatment subsystem, a No.1 refrigerant cooling subsystem, a No.2 refrigerant cooling subsystem, a heavy hydrocarbon separation tank which is used for realizing gas-liquid separation of heavy hydrocarbon and light hydrocarbon, and a denitrification tank, wherein the cold box comprises an NG precooling passage which is used for cooling liquid heavy hydrocarbon components and gas light hydrocarbon components obtained through cooling; an NG deep cooling passage which is used for liquefying the gas light hydrocarbon components; a No.1 refrigerant precooling passage which is used for cooling high-pressure normal-temperature No.1 refrigerant; a No.2 refrigerant first section precooling passage and a No.2 refrigerant second section precooling passage which are used for cooling No.2 refrigerant; a No.1 refrigerant cooling passage which is used for cooling the NG, the high-pressure normal-temperature No.1 refrigerant and high-pressure normal-temperature No.2 refrigerant by using low-pressure low-temperature No.1 refrigerant; and a No.2 refrigerant cooling passage which is used for cooling the light hydrocarbon components and the No.2 refrigerant by using low-pressure low-temperature No.2 refrigerant. By adopting the technical scheme, the complexity and the energy consumption of the system can be reduced.

The invention relates to the technical field of overall station recovery for BOG generated by liquefied natural gas in LNG filling stations due to heat-loss gasification, specifically relates to a system and a method for compression, liquefaction and recovery of BOG in an LNG filling station, and particularly relates to an optimization design in a re-liquefaction system. According to the invention, a first-stage compressor and a vacuum heat-insulation three-in-one heat exchanger are driven by a heat-insulation expander; and the system and the method have the characteristics of being investment-saving, low in running expense, short in process flow, convenient for equipment skidding, and the like, and is quite suitable for being popularized in the LNG filling station.

The invention relates to a natural gas liquefaction system with combination of an auto-cascade refrigeration system and a pulse tube refrigerator. A gas source output end is sequentially connected with a first-stage heat exchanger, a second-stage heat exchanger and a third-stage heat exchanger in an auto-cascade refrigeration cycle through a pressure stabilizing valve and a flow adjusting valve, so that heat exchange is carried out between a gas source and a mixed refrigerant in the first-stage, second-stage and third-stage heat exchangers for first-time cooling, second-time cooling and second-time cooling; the gaseous state natural gas output end of the third-stage heat exchanger is connected with an evaporator, so that heat exchange is carried out between the gaseous state natural gas and the refrigerant in the evaporator for fourth-time cooling. The gaseous state natural gas output end of the evaporator is wound around a cold head of the pulse tube refrigerator in a natural gas condensation box, so that heat exchange is carried out between the gaseous state natural gas and the working medium helium in the cold head in the pulse tube refrigerator in the natural gas condensation box, and the gaseous state natural gas is condensed into liquefied natural gas. The pipe output end wound around the cold head of the pulse tube refrigerator is connected with a storage device through a restricting element, so that the liquefied natural gas is depressurized after flowing through the restricting element and then flows into the storage device to be stored.

The invention discloses an unconventional gas liquefaction system based on a spiral wound heat exchanger. The liquefaction system comprises the spiral wound heat exchanger, a fuel gas heat exchanger, a heavy hydrocarbon heat exchanger and a mixed refrigerant circulation mechanism. The mixed refrigerant circulation mechanism comprises a primary mixed refrigerant compressor and a primary mixed refrigerant compressor cooler, wherein the primary mixed refrigerant compressor and the primary mixed refrigerant compressor cooler are sequentially connected. The fuel gas heat exchanger, the heavy hydrocarbon heat exchanger and a pre-cooling section of the spiral wound heat exchanger are sequentially communicated with one another, and an outlet of the pre-cooling section of the spiral wound heat exchanger is communicated with the heavy hydrocarbon heat exchanger. A qualified component outlet of the heavy hydrocarbon heat exchanger is communicated with a liquefaction section of the spiral wound heat exchanger, an outlet of the liquefaction section of the spiral wound heat exchanger is communicated with a low-temperature rectifying tower and a super-cooling section of the spiral wound heat exchanger, an outlet of the super-cooling section of the spiral wound heat exchanger is communicated with the low-temperature rectifying tower, and the bottom portion of the low-temperature rectifying tower is communicated with an LNG storage tank. The spiral wound heat exchanger is adopted as a main heat exchanger and has the advantages of being firm in structure, allowing a runner not to be easily blocked, being less in leakage point and allowing large-temperature-difference heat transmission in comparison with a louvered fin heat exchanger.

The invention relates to a polyfoam using plant fiber as material wherein its preparation method comprises reacting liquefied plant fiber with methyl aldehyde, creating bakelite an and foaming, the process for preparing liquefied plant fiber includes pre-treating through ultraviolet radiation and gamma-ray irradiation, then liquefied plant fiber is obtained by oxybenzene dissolving method.

The invention relates to an efficient liquefaction system of a regenerative refrigerator adopting direct currents. The efficient liquefaction system comprises a regenerative refrigerating module and aliquefaction module. The regenerative refrigerating module comprises a regenerative refrigerator unit and a direct-current external circulation unit. The regenerative refrigerator unit comprises a compression device, a heat regenerator hot end heat exchanger, a heat regenerator, a heat regenerator cold end heat exchanger, an expansion mechanism cold end heat exchanger, an expansion mechanism andan expansion mechanism hot end heat exchanger which are connected in sequence. Compared with the prior art, the heat exchange heat resistance is smaller, the efficient liquefaction system is particularly suitable for a compact GM refrigerator with excellent refrigerating performance, due to the fact that the heat regenerator is arranged in an air cylinder and an air gap inevitably exists between the heat regenerator and the air cylinder, only a liquefied working medium flow channel can be wound around the outer side of the air cylinder, and large air gap heat resistance exists with heat exchange of the heat regenerator; and the direct currents led out from the interior are in close contact with regenerative filler and alternating currents, so that almost no heat exchange temperature difference exists, and the heat resistance can be effectively reduced.

The invention relates to the technical field of clean energy, and specifically provides a multi-grade liquefying technology of coal and biomass. The technology is characterized in that the coal and the biomass raw materials are processed by crushing, compressing and crushing again, then the sizing is prepared, so that biomass diesel oil which is high in solid content and can be stably conveyed through a pump can be obtained; high-viscosity waste oil which cannot be used as a coal and biomass liquefying solvent in the prior art can be utilized. According to the technology, coal and biomass canbe liquefied under high pressure and high temperature in the existence of proper volume of water; the liquefying product is sequentially subjected to primary cracking, hydrogenation reaction and deepcracking and hydrogenation reaction under the effects of resisting hydrogen and a first catalyst and a second catalyst, so that the coal and the biomass can be converted into biomass oil, and the biomass oil can be refined; the conversion rate of the biomass and the coal is up to 95-99%; the yield of the biomass oil is up to 70-80%; and moreover, the residue content is less than 2.5%.

The invention relates to a novel down pipe pyrolysis liquefying system in a ceramic heat storage ball cyclic heating mode, and belongs to the technical field of renewable energy source utilization. The novel down pipe pyrolysis liquefying system is characterized by comprising a double-barreled heat carrier elevator, a first heat carrier storage bin, a cyclic fluid bed type heat carrier heater, a gas and solid separator, a second heat carrier storage bin, a V-shaped casing pipe reactor and a heat carrier separator which are in sequential cyclic connection. The upper portion of the double-barreled heat carrier elevator is connected with the first heater carrier storage bin through a pipeline, the upper portion of the cyclic fluid bed type heat carrier heater is connected with the gas and solid separator through a pipeline, a first biomass feeding device is connected to the lower portion of the cyclic fluid bed type heat carrier heater, a second biomass feeding device is connected to the upper portion of the V-shaped casing pipe reactor, and the bottom of the heat carrier heater is connected with a gas mixing controller through a pipeline. An angle-adjustable baffle is arranged in the heat carrier heater. The combustion heat of the cyclic fluid bed type heat carrier heater and the waste heat of high-temperature flue gas can be fully utilized, and the novel down pipe pyrolysis liquefying system is high in biomass pyrolysis liquefying efficiency, low in cost and stable in operation.