Natural gas dechlorination device and process

Abstract

The invention relates to the technical field of natural gas purification, and discloses a natural gas dechlorination device and process. The device comprises a flushing water buffer injection facility, a natural gas dechlorination tower and an acidic water flash tank; the flushing water buffer injection facility comprises a flushing water buffer tank and a flushing water pump; the flushing water buffer tank is connected with a flushing water inlet in the upper part of the natural gas dechlorination tower through the flushing water pump; the lower part of the natural gas dechlorination tower is provided with a natural gas inlet; the top of the natural gas dechlorination tower is provided with a dechlorination natural gas outlet; the bottom of the natural gas dechlorination tower is provided with a chlorine-containing acidic water outlet; the dechlorination natural gas outlet is connected with a purification device; and the chlorine-containing acidic water outlet is connected with the acidic water flash tank; a flash steam outlet is formed in the top of the acidic water flash tank; a chlorine-containing wastewater outlet is formed in the bottom of the acidic water flash tank; the flash steam outlet is connected with a sulfur recovery device; the chlorine-containing wastewater outlet is connected with a wastewater treatment device. Chloride ions in the natural gas can be effectively removed, the concentration of the chloride ions in the dechlorinated natural gas is smaller than 50 mg / L, and operation safety of the downstream purification device is guaranteed.

Description

technical field [0001] The invention relates to the technical field of natural gas purification, in particular to a natural gas dechlorination device and process. Background technique [0002] Natural gas purification is an intermediate link in the natural gas production process. The purpose of this link is to remove H from the sulfur-containing natural gas extracted from the gas field. 2 S and H 2 O is almost completely removed, and CO is partially removed 2 , so that the purified natural gas quality meets the requirements of the national standard "Natural Gas" product gas. [0003] At present, the equipment and pipeline materials of domestic natural gas purification plants do not consider the chlorine ions carried in the raw natural gas. Pipelines and instruments are also largely made of stainless steel. [0004] During the actual operation of a natural gas purification plant, the raw natural gas often carries a large amount of chlorine-containing droplets. According t...

AI Technical Summary

Problems solved by technology

The medium pressure of the raw material gas pipeline is high, and usually contains toxic components such as hydrogen sulfide and organic sulfur. Once hydrogen sulfide stress corrosion cracking induced by chloride ions occurs, the leakage of the raw material gas is large and fast, and it affects a wide range, causing personnel poisoning and fire hazards. Explosion, environmental pollution and other risks

If the overall material is improved, the investment in the purification plant will increase significantly

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