摘要:
A method for producing pressurized liquefied natural gas and a production system therefor are provided. The method for producing pressurized liquefied natural gas includes: performing a dehydration process (S11) to remove water from natural gas supplied from a natural gas field, without a process of removing acid gas from the natural gas; and performing a liquefaction process (S12) to produce pressurized liquefied natural gas by liquefying the natural gas, which has undergone the dehydration process, at a pressure of 13 to 25 bar and a temperature of -120 to - 95°C, without a process of fractionating natural gas liquid (NGL). Accordingly, it is possible to reduce plant construction costs and maintenance expenses and reduce LNG production costs. In addition, it is possible to guarantee high economic profit and reduce payback period in small and medium-sized gas fields, from which economic feasibility could not be ensured by the use of a conventional method.
摘要:
The invention is directed to miniaturizing a housing (2) by combining a plate-fin heat exchanger (1, 1) having a great heat exchange rate relative to a volume with a gas-liquid separator (10) having a lateral H-shape. Provided in the housing (2) are the plate-fin heat exchanger (1, 1) for performing heat exchange between a refrigerant and a fluid to be cooled and the gas-liquid separator (10) such that the refrigerant and the fluid to be cooled are transported through a piping in the housing (2) and heat exchange is performed between the refrigerant and the fluid to be cooled so as to cool the fluid to be cooled while performing separation and mixing of a gas and a liquid in the refrigerant. In order to be laterally H-shaped, the gas-liquid separator (10) comprises an upper storage section (10a) having a hollow cylindrical member gas-tightly sealed at both ends thereof, a lower storage section (10c) and an intermediate section (10b) allowing the both storage sections (10a, 10c) to communicate with each other.
摘要:
Systems and methods are provided for the production of liquefied natural gas. At least one of the systems may include a plurality of compression assemblies in fluid communication with a precooler assembly. One compression assembly may be a part of a precooling loop and may include at least one compressor driven by a variable or fixed speed motor. Another compression assembly may be part of a liquefaction loop and may include at least one pair of compressors, each compressor driven by a respective turbine. The liquefaction loop may be fluidly coupled to a main heat exchanger utilized to liquefy at least a portion of a feed gas stream containing natural gas flowing through the main heat exchanger, thereby producing liquefied natural gas.
摘要:
In an embodiment, a system for cooling or liquefying a process gas in a motion environment, includes: (a) a separation vessel, wherein the separation vessel includes motion suppressing baffles, wherein the separation vessel separates a high pressure refrigerant stream thereby producing a vapor refrigerant stream and a liquid refrigerant stream; (b) a vapor liquid refrigerant pipe for delivering the liquid refrigerant stream from the separation vessel to an external heat exchanger core; (c) at least one external heat exchanger core, wherein the external heat exchanger core is external to a kettle, wherein the liquid refrigerant stream and a warmer process stream undergo indirect heat exchange in the external heat exchanger core thereby producing a cooled process stream and a vaporized refrigerant stream.
摘要:
Controlling the production of a liquefied natural gas (31) comprises measuring the temperature (50) and the flow rate (55) of the liquefied natural gas (31); maintaining the flow rate of the heavy mixed refrigerant (60a) at an operator manipulated set point (80), and determining the flow rate of the light mixed refrigerant (86) from (i) the flow rate of the heavy mixed refrigerant (80) and (ii) an operator manipulated set point for the ratio of the flow rate of the heavy mixed refrigerant to the flow rate of the light mixed refrigerant (81); determining a dependent set point (91) for the ratio of the flow rate of the liquefied natural gas to the flow rate of the heavy mixed refrigerant such that the temperature (50) of the liquefied natural gas is maintained at an operator manipulated set point (90); determining a dependent set point (95) for the flow rate of the liquefied natural gas (95) from (i) the dependent set point (91) for the ratio of the flow rate of the liquefied natural gas product stream to the flow rate of the heavy mixed refrigerant and (ii) the flow rate of the heavy mixed refrigerant (60c); and maintaining the flow rate of the liquefied natural gas (55a) at its dependent set point (95).
摘要:
Controlling the production of a liquefied natural gas (31) comprises measuring the temperature (50) and the flow rate (55) of the liquefied natural gas (31); maintaining the flow rate of the heavy mixed refrigerant (60a) at an operator manipulated set point (80), and determining the flow rate of the light mixed refrigerant (86) from (i) the flow rate of the heavy mixed refrigerant (80) and (ii) an operator manipulated set point for the ratio of the flow rate of the heavy mixed refrigerant to the flow rate of the light mixed refrigerant (81); determining a dependent set point (91) for the ratio of the flow rate of the liquefied natural gas to the flow rate of the heavy mixed refrigerant such that the temperature (50) of the liquefied natural gas is maintained at an operator manipulated set point (90); determining a dependent set point (95) for the flow rate of the liquefied natural gas (95) from (i) the dependent set point (91) for the ratio of the flow rate of the liquefied natural gas product stream to the flow rate of the heavy mixed refrigerant and (ii) the flow rate of the heavy mixed refrigerant (60c); and maintaining the flow rate of the liquefied natural gas (55a) at its dependent set point (95).
摘要:
The invention is directed to miniaturizing a housing (2) by combining a plate-fin heat exchanger (1, 1) having a great heat exchange rate relative to a volume with a gas-liquid separator (10) having a lateral H-shape. Provided in the housing (2) are the plate-fin heat exchanger (1, 1) for performing heat exchange between a refrigerant and a fluid to be cooled and the gas-liquid separator (10) such that the refrigerant and the fluid to be cooled are transported through a piping in the housing (2) and heat exchange is performed between the refrigerant and the fluid to be cooled so as to cool the fluid to be cooled while performing separation and mixing of a gas and a liquid in the refrigerant. In order to be laterally H-shaped, the gas-liquid separator (10) comprises an upper storage section (10a) having a hollow cylindrical member gas-tightly sealed at both ends thereof, a lower storage section (10c) and an intermediate section (10b) allowing the both storage sections (10a, 10c) to communicate with each other.
摘要:
Provided is an improved refrigeration system for pre-cooling natural gas or cooling a mixed refrigerant for natural gas liquefaction in a propane refrigeration process widely used for the liquefaction of natural gas. The system comprises a plurality of plate-fin heat exchangers (31) preferably arranged in a parallel relationship for passing a propane refrigerant as a vertical flow and pre-cooling natural gas or cooling a mixed refrigerant for liquefying natural gas, and a thermo siphon drum (33,35,37,39) for the propane refrigerant consisting of a horizontally disposed, laterally elongated tank. Because the passages of the heat exchanger for the natural gas or the mixed refrigerant extend over their entire length in mutually separate relationship, even when the propane refrigerant, the natural gas or the mixed refrigerant is in both gas and liquid phases, a high efficiency of heat transfer can be attained, and the size of the heat exchanger can be reduced. In particular, from an economic view point, it is preferable if the thermo siphon drum serves also as a flash tank.
摘要:
The current invention is related to hydrocarbon fluid processing plants, methods of designing hydrocarbon fluid processing plants, methods of operating hydrocarbon fluid processing plants, and methods of producing hydrocarbon fluids using hydrocarbon fluid processing plants. More particularly, some embodiments of the invention are related to natural gas liquefaction plants, methods of designing natural gas liquefaction plants, methods of operating natural gas liquefaction plants and methods of producing LNG using natural gas liquefaction plants. One embodiment of the invention includes a hydrocarbon fluid processing plant including a plurality of process unit module types, the plurality of process unit module types including at least a first process unit module type including one or more first process unit modules and a second process unit module type including two or more integrated second process unit modules wherein at least one of the first process unit modules and at least one of the second process unit modules are sized at their respective substantially maximum processing efficiency.