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KR-20260063221-A - SYSTEM FOR PURGING COMPANDER AND METHOD FOR PURGING COMPANDER

KR20260063221AKR 20260063221 AKR20260063221 AKR 20260063221AKR-20260063221-A

Abstract

A purging system for a compander according to the present invention is a purging system for a compander used to re-liquefy BOG in a ship, comprising: a compander having an inlet and an outlet; an input line having one end connected to the inlet of the compander; an output line having one end connected to the outlet of the compander; a buffer tank for storing N2; and a supply line extending from the buffer tank to the input line and the output line to supply N2 toward one end of the respective line.

Inventors

  • 신철수

Assignees

  • 에이치디한국조선해양 주식회사

Dates

Publication Date
20260507
Application Date
20241030

Claims (9)

  1. As a purging system for a compander to be used for re-liquefying BOG on a ship, Compander having an entrance and an exit; An input line having one end for connecting to the inlet of the above compander; An output line having one end for connecting to the outlet of the above compander; Buffer tank for storing N2; A supply line extending from the buffer tank to the input line and the output line to supply N2 to one end of the line, Compander's fuzzing system.
  2. In paragraph 1, The above buffer tank is installed in the engine room of the ship, Compander's fuzzing system.
  3. In paragraph 1, The above compander is, A first compressor having an inlet and an outlet; A second compressor positioned downstream of the first compressor and having an inlet and an outlet; A third compressor positioned downstream of the second compressor and having an inlet and an outlet; and It includes an expander positioned downstream of the third compressor and having an inlet and an outlet, The above input line is, A first input line having one end for connecting to the inlet of the first compressor; A second input line having one end for connecting to the inlet of the second compressor; A third input line having one end for connecting to the inlet of the third compressor; and It includes a fourth input line having one end for connecting to the inlet of the above-mentioned expander, and The above output line is, A first output line having one end for connecting to the outlet of the first compressor; A second output line having one end for connecting to the outlet of the second compressor; A third output line having one end for connecting to the outlet of the third compressor; and It includes a fourth output line having one end for connecting to the outlet of the above-mentioned expander, and The above supply line is connected from the buffer tank to the first input line, the first output line, the second input line, the second output line, the third input line, the third output line, the fourth input line, and the fourth output line, and is capable of supplying N2 to one end of the corresponding line. Compander's fuzzing system.
  4. In paragraph 1, A first blank is installed between the inlet of the compander and one end of the input line to block the connection between them, and is configured so that after removing the first blank, one end of the input line can be connected to the inlet of the compander. A second blank is installed between the outlet of the compander and one end of the output line to block the connection between them, and is configured so that after removing the second blank, one end of the output line can be connected to the outlet of the compander. Compander's fuzzing system.
  5. In paragraph 4, At least between the operation of removing the first blank and the operation of connecting one end of the input line to the inlet of the compander, N2 can be supplied from the buffer tank through the supply line toward one end of the input line, and N2 can be supplied from the buffer tank through the supply line toward one end of the output line between the operation of removing the second blank and the operation of connecting one end of the output line to the outlet of the compander, Compander's fuzzing system.
  6. As a purging method for a compander to be used for re-liquefying BOG on a ship, The above compander comprises a compander having an inlet and an outlet, an input line having one end connected to the inlet of the compander, an output line having one end connected to the outlet of the compander, a first blank for blocking between the inlet of the compander and one end of the input line, a second blank for blocking between the outlet of the compander and one end of the output line, a buffer tank for storing N2, and a supply line extending from the buffer tank to the input line and the output line to supply N2 toward one end of the corresponding line. A blank removal step for removing the first blank and the second blank; N2 supply step of supplying N2 from the buffer tank through the supply line toward one end of the input line and the output line; and A line connection step comprising connecting one end of the input line to the inlet of the compander and connecting one end of the output line to the outlet of the compander, Companda's fuzzing method.
  7. In paragraph 6, The above buffer tank is installed in the engine room of the ship, Companda's fuzzing method.
  8. In paragraph 6, The above N2 supply step is initiated after the blank removal step is initiated or simultaneously with the blank removal step. Companda's fuzzing method.
  9. In paragraph 6, The above N2 supply step is completed after the above line connection step is completed or is completed simultaneously with the above line connection step. Companda's fuzzing method.

Description

Compander's Fuzzing System and Compander's Fuzzing Method {SYSTEM FOR PURGING COMPANDER AND METHOD FOR PURGING COMPANDER} The present invention relates to a purging system for a compander and a purging method for a compander, and more specifically, to a purging system and method for a compander to be used, for example, to reliquefy Boil-Off Gas (BOG) in an LNG vessel. For example, in LNG vessels, a technology is used to cool N2 to cryogenic temperatures using a compander to reliquefy the BOG generated in the LNG storage tanks. For the initial operation of such a compander, drying or purging operations within the N2 loop are required, and moisture must be removed to lower the dew point and prevent cold spots. Meanwhile, there is a problem in that moisture from the outside may enter during the process of removing the blanks installed at the inlet and outlet of the compander for drying, potentially contaminating the dew point within the N2 loop. To solve the above problem, a method has been proposed to supply N2 to the gas seal of the compander using N2 that is pre-stored in the N2 tank included in the existing BOG reliquefaction facility. However, if there is a shortage of N2 gas in the N2 tank, the N2 boosting compressor must be operated to refill the N2 tank, which not only consumes cost and time but also has the disadvantage of not being able to properly maintain the desired dew point. FIG. 1 is a schematic diagram of a purge system of a compander according to an embodiment of the present invention. Figure 2 shows the N2 flow circulating through the compander for BOG re-liquefaction in Figure 1, indicated by a thick line. Figure 3 shows the N2 flow supplied from the buffer tank for compander purging in Figure 1, indicated by a thick line. FIG. 4 is a flowchart of a purging method of a compander according to an embodiment of the present invention. A purging system (100) and purging method of a compander according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram of a purging system (100) of a compander according to an embodiment of the present invention. Referring to FIG. 1, the purge system (100) of the compander includes a compander (110: 111; 112; 113; 114), an input line (120: 121; 122; 123; 124), an output line (130: 131; 132; 133; 134), a buffer tank (140), and a supply line (150: 151; 152; 153; 154; 155; 156; 157; 158). The compander (110) is intended to be used, for example, to reliquefy BOG in an LNG vessel, and serves to cool N2 to a cryogenic temperature by compressing and expanding it. The N2 cooled by the compander (110) moves to the BOG condenser (COND) and reliquefies the BOG through heat exchange with the BOG. The compander (110) may include a plurality of compressors (111, 112, 113) and an expander (114). More specifically, the compander (110) may include a first compressor (111) having an inlet and an outlet, a second compressor (112) positioned downstream of the first compressor (111) and having an inlet and an outlet, a third compressor (113) positioned downstream of the second compressor (112) and having an inlet and an outlet, and an expander (114) positioned downstream of the third compressor (113) and having an inlet and an outlet. A first intercooler (IC1) may be placed between the first compressor (111) and the second compressor (112). Additionally, a second intercooler (IC2) may be placed between the second compressor (112) and the third compressor (113). An aftercooler (AC) and an N2 heat exchanger (HE) may be placed between the third compressor (113) and the expander (114), respectively. In the N2 heat exchanger (HE), heat exchange may occur between the N2 moving from the third compressor (113) through the aftercooler (AC) to the expander (114) and the N2 moving from the BOG condenser (COND) to the first compressor (111). The N2 flow for BOG re-liquefaction using the compander (110) is shown as a thick line in FIG. 2. The input line (120) has one end to be connected to the inlet of each compressor (111, 112, 113) and expander (114) of the compander (110). More specifically, the input line (120) may include a first input line (121) having one end connected to the inlet of a first compressor (111), a second input line (122) having one end connected to the inlet of a second compressor (112), a third input line (123) having one end connected to the inlet of a third compressor (113), and a fourth input line (124) having one end connected to the inlet of an expander (114). The other end of the first input line (121) may be connected to the N2 heat exchanger (HE) side, the other end of the second input line (122) may be connected to the first intercooler (IC1) side, the other end of the third input line (123) may be connected to the second intercooler (IC2) side, and the other end of the fourth input line (124) may be connected to the N2 heat exchanger (HE) side. The output line (130) has one end to be co