Supercritical pressure coal-fired steam-injection boiler

Abstract

The invention relates to a steam-injection boiler for thermal recovery of heavy oil, in particular to a supercritical pressure coal-fired steam-injection boiler. A flexible fin membrane water-cooled wall is adopted by a hearth of the device; both a radiation section tube bundle and an overheating section tube bundle are threaded tubes; a water treatment device is connected with a plunger pump; the plunger pump is connected with a water supply heat exchanger outer tube; the water supply heat exchanger outer tube is connected with a header A; the header A, a first-stage convection section, a header C, a second-stage convection section and a header B are connected in sequence; the header B is connected with a water supply heat exchanger inner tube; the water supply heat exchanger inner tube is connected with a header D; and the header D, a middle arch tube and a front arch tube are connected in sequence. According to the supercritical pressure coal-fired steam-injection boiler, migration of a high-temperature steam region from a radiation section to an overheating section is realized, the phenomenon of heat transfer degradation is avoided, and further the steam exit temperature is improved, so that the steam exit pressure reaches the range of the supercritical pressure, effective exploitation of deep heavy oil and even extra and super heavy oil reservoir is realized, and the steam-injection exploitation effect is improved.

Description

Technical field: [0001] The invention relates to a steam injection boiler for thermal development of heavy oil, in particular to a supercritical pressure coal-fired steam injection boiler. Background technique: [0002] Steam injection boilers are distinguished from fuel, mainly including oil-fired (gas) steam injection boilers and coal-fired steam injection boilers. With the introduction of relevant policies such as "oil to coal" and "energy saving and consumption reduction", the development prospects of coal-fired steam injection boilers are even better. For the vast. At present, widely used coal-fired steam injection boilers operate under subcritical pressure conditions and are mainly composed of burners, furnaces, convection sections and water heat exchangers. The flow of soda water is as follows: the desalted water from the water treatment device enters the plunger pump to boost the pressure, and then enters the outer pipe of the feed water heat exchanger, so that the ...

AI Technical Summary

Problems solved by technology

It overcomes the heat transfer deterioration that is easy to occur in existing coal-fired steam injection boilers, and the generated steam pressure can only reach 21MPa of the subcritical pressure, and cannot reach the supercritical pressure, resulting in poor gas injection effect, making it difficult to exploit high-pressure deep well blocks, supercritical Insufficiency of heavy oil blocks

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