Comprehensive utilization system and process for sulfur-containing natural gas development

Abstract

The invention belongs to the technical field of natural gas processing and application, and particularly relates to a comprehensive utilization system and process for sulfur-containing natural gas development. The comprehensive utilization system for the sulfur-containing natural gas development includes an amine method desulfurization and decarbonization system, a wet acid production system, a waste heat power generation system and an LNG liquefaction system. The comprehensive utilization system and process solve the problems such as waste water, waste slag and waste gas generated during theextraction purification and deep processing of sulfur-containing natural gas, and utilize the waste heat of a waste heat boiler for power generation, thereby greatly reducing the system operation cost, reducing the safety risks, and eliminating environmental pollution and the like; and the process is short, the acid gas concentration subject range is wide, the exhaust gas emission after final treatment fully meets and is suitable for the increasingly strict national environmental protection standards, the strategic goal of the enterprise circular economy is truly realized, and the comprehensive utilization system and process can be widely applied to the field of low, medium, high and extra-high natural gas extraction and purification and deep processing.

Description

technical field [0001] The invention belongs to the technical field of natural gas processing and application, and in particular relates to a comprehensive utilization system and process for the development and utilization of sulfur-containing natural gas. Background technique [0002] Natural gas is naturally generated in the underground void layer, and is a mixed gas composed of hydrocarbon gases such as methane, ethane, propane and other low-molecular saturated hydrocarbons and a small amount of non-hydrocarbon gases such as hydrogen sulfide, carbon dioxide and nitrogen. As a clean, efficient and high-quality gas energy and chemical raw material, it is widely used in many fields such as city gas, natural gas liquefaction, natural gas power generation and natural gas chemical industry. With the "Sichuan-East Gas Transmission" pipeline and the "Second West-East Gas Transmission Line" fully put into operation, my country has basically formed a national natural gas backbone p...

AI Technical Summary

Problems solved by technology

Under the requirements of national policies, under the condition of increasingly strong market demand, China is ushering in a wave of "natural gas wave". Natural gas from underground usually contains H 2 S, CO 2 Equal components, H 2 S and CO 2 The presence of such acidic gases will cause corrosion of pipelines, equipment, etc., and the corrosion will be accelerated in the presence of water, so it is necessary to treat CO 2 for separation, the H 2 S is recycled, usually the content of CO2 is less, the recovery value is not high, so only for H 2 S is used for recovery. The hydrogen sulfide recovery processes mainly include sulfur recovery and acid recovery. The sulfur recovery process is mainly based on the Claus process. The complex iron wet desulfurization process has also been applied in succession, but there are still many problems. Claus The process investment is large, the floor area is large, the construction period is long, and there is still SO in the tail gas 2 The problem of exceeding the standard is more serious in the complex iron wet desulfurization process. The desulfurization agent has a large amount of circulation, and the sulfur purity is low (only 70%). The sulfur refining section of the wet sulfur process produces a large amount of saline wastewater, which is difficult to treat.

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