Superheated steam and subcritical pressure steam generator

Abstract

The invention relates to a superheated steam and subcritical pressure steam generator which comprises a burner, a hearth, a connecting flue, a superheater, a convection steel pipe economizer, and a chimney. The components are sequentially communicated in a motion direction of hot smoke. The superheater is arranged above the connecting flue. The connecting flue is connected to the rear end of the hearth. The convection steel pipe economizer is arranged above the superheater. Each water-water heat exchanger is in a sleeve spiral reciprocating pipe structure which is disposed on the side of the outside of the hearth for heat exchange. Fed water enters a water feeding pump from a water inlet, is pressured by the water feeding pump, sequentially passes a water pipeline, the water-water heat exchanger, the convection steel pipe economizer, another water-water heat exchanger, a hearth tube bundle, a steam-water separator, the superheater and a steam outlet, and is heated gradually before superheated steam or saturated wet steam is discharged. The superheated steam and subcritical pressure steam generator special for oilfields is capable of generating both superheated steam and saturated wet steam under subcritical pressure operation conditions.

Description

technical field [0001] The invention relates to a special equipment for thermally exploiting underground heavy oil in the petroleum industry, in particular to a steam generator specially used for oilfields, which can generate superheated steam compatible with subcritical pressure operating conditions and generate saturated wet steam. Background technique [0002] At present, the ordinary steam generators used at home and abroad usually produce wet steam, and the dryness of the steam is controlled within 80%. The reason is that the water treatment process that only softens and removes hardness but not desalination is adopted, and at least 20% of the salt must be retained. , to avoid fouling on the inner wall of the boiler tube, affecting safe operation. [0003] With the development of heavy oil in the oil field, the method of injecting wet steam can no longer meet the needs of the development of new technologies and processes for heavy oil production. The high-efficiency de...

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Problems solved by technology

[0003] With the development of heavy oil in the oil field, the method of wet steam injection can no longer meet the needs of the development of new technologies and processes for heavy oil production.

The high-efficiency development of heavy oil and the subsequent high-cycle production mainly rely on the latent heat of steam vaporization to heat crude oil, so the water in the steam not only does not help the production, but will increase the pore volume of the formation and increase the water content of the produced fluid. Reduced heavy oil production

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