KR940002585A - Cooling device using propane refrigerant in natural gas liquefaction process - Google Patents

Abstract

In the propane refrigerant process which is widely used as a natural gas liquefaction process, it provides the improved cooling apparatus for precooling natural gas or cooling the mixed refrigerant for natural gas liquefaction. As a heat exchanger for pre-cooling natural gas or cooling a mixed refrigerant for natural gas liquefaction, propane-based refrigerants are preferably distributed in a vertical direction, preferably for plate fin heat exchangers installed in parallel, and for horizontal propane-based refrigerants generally installed horizontally. It has a thermosiphon drum, so that passages of natural gas or mixed refrigerant do not rotate each other over the entire length, so that high heat transfer effect can be achieved even if any of propane-based refrigerant, natural gas or mixed refrigerant is gas-liquid mixed, and the heat exchanger is downsized. can do. In particular, it is desirable from the viewpoint of economics that the thermosiphon drum also serves as a flash tank.

Description

Cooling device using propane refrigerant in natural gas liquefaction process

Since this is an open matter, no full text was included.

1 is a schematic diagram showing a natural gas precooling apparatus in a natural gas liquefaction process to which a cooling apparatus using propane according to the present invention is applied,

2 is a schematic diagram showing a liquefaction apparatus of natural gas in a natural gas liquefaction process to which a cooling apparatus using propane according to the present invention is applied,

3 is a schematic view showing the main parts of the first embodiment of the cooling apparatus according to the present invention.

Claims (4)

In an apparatus for precooling natural gas or cooling a mixed refrigerant for natural gas liquefaction by using a propane-based refrigerant in a natural gas liquefaction process, a plurality of passages of the natural gas or the mixed refrigerant are generally in the overall length. It is composed of a plate fin heat exchanger installed in such a manner as to be separated from each other over each other, and provided so that the propane refrigerant flows in a vertical direction, and a horizontally installed horizontal tank, and the heat for the propane refrigerant connected to the plate fin heat exchanger. And a phone drum. The apparatus according to claim 1, wherein the thermosiphon drum is connected to serve as a header commonly provided for the plate fin heat exchanger provided with a plurality of thermosiphon drums. The apparatus of claim 1 or 2, wherein the thermosiphon drum also serves as a flash tank. In the natural gas liquefaction process, in the apparatus for precooling natural gas using a propane type refrigerant | coolant, or cooling the mixed refrigerant for black natural gas liquefaction, the source of a propane type refrigerant | coolant and the said propane sent from the said source. A natural gas by means of an expansion device for depressurizing the system refrigerant, a separation drum for gas-liquid separation of the propane-based refrigerant consisting of a mixture of vapor and liquid obtained from the expansion device, and the propane-based refrigerant as an amorphous liquid obtained from the separation drum. Or a heat exchanger for cooling the mixed refrigerant for natural gas liquefaction and returning the propane-based refrigerant composed of a mixture of steam and liquid after heat exchange to the separation drum, and a part of the propane-based refrigerant as a liquid obtained from the separation drum. The expansion device of the next stage to extract and depressurize, and Natural gas or gas by means of a separation drum of the next stage for gas-liquid separation of the propane-based refrigerant consisting of a mixture of vapor and liquid obtained from an expansion device of the next stage, and the propane-based refrigerant as a boiling point obtained from the separation drum of the next stage. The next stage heat exchanger which cools the mixed refrigerant for natural gas liquefaction, and returns the said propane type refrigerant | coolant which consists of a mixture of the steam and liquid after heat exchange to the next stage separation drum, and the steam obtained from the said separation drum of each stage. And a steam conduit for returning the propane-based refrigerant to the supply source, wherein the heat exchanger extends in a state in which a plurality of passages of the natural gas or the mixed refrigerant are usually separated from each other over the entire length of the propane-based refrigerant; Plate-type thermal bridge installed to allow water to flow in a vertical direction Group becomes achieved, and wherein said separation drums consisting of oblong tank usually is installed horizontally as said propane based refrigerant yeolsayi phone drum for connection to said plate fin type heat exchanger. ※ Note: The disclosure is based on the initial application.