Method and device for generating superheated steam from high-salt boiler feed water by stage evaporation

Abstract

The invention discloses a method and a device, which are used for generating superheated steam from high-salt boiler feed water through stage evaporation, and belongs to the technical field of boiler equipment. According to the method, a boiler drum is divided into a net section and a salt section; the lower part of a salt-section cyclone is connected with the salt section to achieve discharging; the bottom end of the salt-section cyclone is connected with a salt-section down pipe, the salt-section down pipe is connected with a salt-section distribution header, the other end of a salt-section riser pipe is connected with the middle of the salt-section cyclone, a cavity body in the upper part of the salt-section cyclone is connected with a corrugated plate, the top of the salt-section cyclone is connected with a salt-section steam outlet, and the salt-section steam outlet is connected with a pipeline at one end of a super heater; the net-section distribution header is connected with a net-section riser pipe; a salt-section communication pipe is used for communicating a net-section steam drum with the salt-section cyclone. The method has the benefits that the requirement on the salt content of boiler water in a heavy oil thermal recovery boiler is greatly lowered on the premise of guaranteeing the steam quality, moderately treated heavy oil recovery water can be reused, heavy oil development water can be recycled, the clear water consumption and the sewage discharge are reduced, the environment is protected, and the heavy oil thermal recovery cost is reduced.

Description

technical field [0001] The invention relates to a method and a device for generating superheated steam of high-salt boiler feed water by segmental evaporation, and belongs to the technical field of boiler equipment. Background technique [0002] In recent years, with the increasing shortage of oil resources and rising prices, the oil industry has paid more and more attention to the exploitation of heavy oil. In order to increase the temperature of heavy oil, reduce its viscosity, and make it easy to extract heavy oil from the oil layer, the method of injecting high-temperature and high-pressure steam into the oil layer is the main measure for heavy oil production. Heavy oil production will be associated with a large amount of heavy oil produced water, which has a large salt content, complex components, and high temperature. After moderate treatment of heavy oil sewage, it can be reused in steam injection boilers for recycling, which can greatly save Clean water resources, r...

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Problems solved by technology

When heavy oil thermal recovery boilers use high-salt water as boiler feed water, the boiler water has a high salt content, resulting in higher steam salt content than the steam quality requirements of ordinary boilers. It is not suitable to further heat the steam to overheat it, thereby Unable to generate steam with higher parameters, which limits the efficiency of heavy oil recovery

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