A single-stage mixed refrigerant natural gas liquefaction process operation adjustment system and method
A technology for mixing refrigerants and regulating systems, applied in refrigeration and liquefaction, liquefaction, refrigerators, etc., can solve problems such as excess cooling capacity, increased difficulty and instability, dew point temperature of refrigerant cycle components, etc., to improve external The ability to change, the effect of achieving safe and stable operation
Inactive Publication Date: 2017-10-20
SOUTH CHINA UNIV OF TECH +1
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Problems solved by technology
When the raw material gas load decreases, if the refrigerant flow rate of the system does not decrease, the cooling capacity will be excessive, and the refrigerant temperature at the outlet of the recuperator heat exchanger will drop, which will easily reach the dew point temperature of the refrigerant cycle components, resulting in compressor humidity. Compression; when the raw gas load increases, if the refrigerant flow rate of the liquefaction system does not increase, the cooling capacity will be insufficient, so that the natural gas cannot be lowered to the required temperature
When the feed gas load changes, usually, the operator who runs the process tries to adjust the opening of the low-temperature throttle valve to change the flow of the system, but when this measure changes the flow of the system, the circulating ratio of the refrigerant components will change, since the condensing temperature has not changed at this time, we do not want the ratio of refrigerant to change
Therefore, this adjustment method that changes the circulating ratio of refrigerant components increases the difficulty and instability of system operation
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[0025] Such as figure 1 shown. The present invention is a single-stage mixed refrigerant natural gas liquefaction process operation adjustment system, including three-stage compressors C1-C3, condensation coolers A1-A3, multi-stream heat exchanger 4, throttling mechanism V3, intermediate throttling Valve V4, gas-liquid separation tank B3, buffer tank, controllable passage gas phase composition adjustment unit 1, liquid phase composition adjustment unit 2 and control unit 3; wherein, controllable passage gas phase composition adjustment unit 1 is composed of controllable gas phase group It is composed of inlet valve V1, controllable gas phase component outlet valve V2 and refrigerant collection tank B1; liquid phase component adjustment unit 2 is composed of gas-liquid separation tank B2 and refrigerant pump P1;
[0026] The outlet of the C1 section of the three-section compressor is connected to the inlet of the A1 condensing cooler, and the outlet of the A1 condensing cooler...
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The invention discloses a system and method for adjusting the operation of a single-stage mixed refrigerant natural gas liquefaction process. , liquid phase component adjustment unit and control unit, etc. This system does not need to use a frequency-variable compressor, and greatly improves the system's ability to respond to external changes. When the ambient temperature changes, the rotation speed of the refrigerant pump is not changed, and the opening of the intermediate throttle valve is controlled to change the distribution ratio of the system's working fluid circulation group to adapt to the environmental change. Especially when the ambient temperature decreases, it can be fully utilized by adjusting The cold energy of the environment realizes the energy-saving and stable operation of the system; when the system faces changes in the load of raw material gas, the purpose of adjusting the high and low pressure of the system and the flow rate of the working medium can be realized through the controllable passage gas phase composition adjustment unit, which enables the system to respond quickly In order to cope with the change of raw material gas load, realize the safe and stable operation of the system.
Description
technical field [0001] The invention relates to the subject field of engineering thermophysics and energy utilization, in particular to a single-stage mixed refrigerant natural gas liquefaction process operation regulation system and method. Background technique [0002] The single-stage mixed refrigerant natural gas liquefaction process is widely used in small and medium-sized natural gas liquefaction stations because of its advantages such as high efficiency, simple structure, low investment cost, and convenient refrigerant replenishment. The process generally adopts multi-stage compression, and the five-component mixed working medium N2 / CH4 / C2H4 / C3H8 / iC5H12 is used for refrigeration. Like all refrigeration systems using mixed refrigerants, the performance of this process is deeply affected by the ratio of the mixed refrigerant cycle, and the actual operation is very complicated. [0003] But in fact, the single-stage mixed refrigerant natural gas liquefaction process is ...
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IPC IPC(8): F25J3/00F25B41/06F25B41/30
Inventor 刘金平许雄文李日新杨光达邢志辉赵德泉
Owner SOUTH CHINA UNIV OF TECH