gas supply system

Abstract

The present invention discloses a gas supply system. It includes: a storage tank for storing liquefied gas and steam, a compression part for pressurizing the steam, and after the pressurized steam passes through the compression part, it is sent to the first gas supply pipe of the first engine; a branch is formed from the end of the compression part , part of the steam compressed by the compression part is sent to the second gas supply pipeline of the second engine; part of the evaporated gas after receiving the pressurization is supplied, and it is sent to the reliquefaction pipeline; the calorific value of the gas supplied by the second engine is measured and adjusted The calorific value adjustment part. The reliquefaction pipeline includes: a cooling part for cooling the pressurized vapor; after the pressurized vapor passes through the cooling part, it is sent to the first expansion valve for the first round of decompression; after passing through the first expansion valve, the gas and liquid are mixed The steam in the state is divided into the first gas-liquid separator of gas and liquid; the gas separated by the first gas-liquid separator is supplied to the vapor circulation pipeline of the second engine; and the liquefaction of the liquid separated by the first gas-liquid separator is received Air circulation pipeline.

Description

technical field [0001] The invention relates to gas supply systems. Background technique [0002] With the strengthening of the International Maritime Organization (IMO) regulation on the emission of greenhouse gases and various air pollutants, in the shipbuilding and shipping industries, the use of clean energy natural gas to replace conventional fuels such as heavy oil and diesel for ship gas has increased. [0003] In order to facilitate storage and transportation, natural gas (Natural Gas) is usually cooled to -162 degrees Celsius, its volume is compressed to 1 / 600, and it is managed and applied in the form of colorless and transparent ultra-low temperature liquefied natural gas (Liquefied Natural Gas). [0004] This liquefied natural gas is stored and transported in insulated storage tanks on the ship's hull. However, in actual operation, it is impossible to completely insulate LNG for transportation, and the external heat will continue to be conducted to the inside of...

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Problems solved by technology

[0007] Therefore, the boil-off gas produced by the natural vaporization inside the storage tank contains more components of nitrogen with a relatively low boiling point, which leads to a decrease in the reliquefaction efficiency of the boil-off gas, and has an impact on the application and treatment of the boil-off gas

[0008] In addition, when the boil-off gas is supplied to the ship engine as fuel gas, the nitrogen contained in the boil-off gas will affect the calorific value of the gas

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