Sewage and boiler flue gas treatment device and method for zero-emission auxiliary steam thermal recovery

Abstract

The invention belongs to the field of oil-gad field development, and in particular relates to an auxiliary steam thermal recovery device and an auxiliary steam thermal recovery method for sewage and boiler smoke treatment zero emission. The method comprises the following steps: dissolving sulfur dioxide in smoke by combination of sewage discharged by an injection-production sewage discharge system and smoke discharged by a steam boiler and by use of sewage so as to remove smoke after sulfur dioxide removal, thus obtaining dry carbon dioxide and nitrogen mixed gas, and the taking the dry carbon dioxide and nitrogen mixed gas as the gas source for the auxiliary steam thermal recovery; and meanwhile, performing thermal exchange on the smoke and the sewage while combining the smoke and the sewage so as to obtain high-temperature sewage, treating the high-temperature sewage to obtain the clear water meeting the boiler water standard and solid precipitates, taking the clear water as the clear water for the steam injection of the steam boiler and the steam obtained by the steam boiler as the steam source of the steam thermal recovery, thereby realizing the auxiliary steam thermal recovery while achieving the sewage and boiler smoke treatment zero emission.

Description

technical field [0001] The invention mainly belongs to the field of oil and gas field development, and in particular relates to a device and method for zero-emission auxiliary steam thermal recovery for sewage and boiler flue gas treatment. Background technique [0002] Domestic heavy oil exploitation is mainly based on thermal recovery, and the steam generator used will produce unusable flue gas while producing high-dryness steam. On the one hand, the flue gas contains carbon dioxide, nitrogen, sulfide and other harmful gases that cause great pollution to the environment; The heat source, after recycling, can save a lot of energy. [0003] The flue gas produced by the steam boiler contains 10%-15% carbon dioxide and 80%-85% nitrogen, which are two key components required for steam injection and oil recovery. Flue gas-assisted thermal oil recovery is an effective way to improve the development effect of heavy oil fields and enhance the recovery factor. Carbon dioxide is a...

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Problems solved by technology

If such a large amount of produced water is directly discharged outside, it will cause very serious environmental pollution problems, and at the same time waste precious water resources

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