Fixed type high heating efficiency direct current steam injection boiler

Abstract

The invention discloses a fixed type high heating efficiency direct current steam injection boiler, and belongs to the technical field of steam injection boilers of oil fields. The fixed type high heating efficiency direct current steam injection boiler comprises a smoke system and a water path system. The smoke system comprises a transition section, an evaporation section, a lower convection section, an upper convection section and a chimney which communicate with one another sequentially in the smoke flowing direction. The evaporation section is located on the upper portion of the transitionsection. The lower convection section is located on the upper portion of the evaporation section. The upper convection section is located on the upper portion of the lower convection section. The chimney is located on the upper portion of the upper convection section. The transition section communicates with a flue of a radiation hearth. The lower portion of the lower convection section is connected with a heating pipe inside the radiation hearth through a water outlet pipe. A water outlet end of the heating pipe inside the radiation hearth is connected with an evaporation pipe bundle insidethe evaporation section. A water inlet pipe is arranged on the upper portion of the upper convection section. The temperature of water inside the water inlet pipe is 60-80 DEG C when the water entersthe upper convection section. Convection pipe bundles formed by connecting studded pipes are arranged in the lower convection section and the upper convection section separately. The temperature of smoke exhausted by the chimney is 100-120 DEG C. The problem of low heating efficiency of a steam injection boiler taking high-temperature recycled water as boiler feed water is solved.

Description

technical field [0001] The invention relates to a steam injection boiler for thermal exploitation of underground heavy oil in the petroleum industry, in particular to a fixed high thermal efficiency direct-flow steam injection boiler suitable for high-temperature recycled water as boiler feed water. Background technique [0002] At present, the thermal efficiency of oilfield steam injection boilers in use in China is generally lower than 88%, while the newly designed steam injection boilers require fuel thermal efficiency ≥ 90%, and gas thermal efficiency ≥ 92%. Although they can meet the national standards, there is still room for improvement. The current development trend of steam injection boilers is to reduce flue gas emissions and maximize thermal efficiency. Under the impact of low oil prices, oil fields at home and abroad are trying to reduce costs and increase efficiency, and the thermal efficiency of steam injection boilers directly determines the fuel consumption. ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a fixed high thermal efficiency once-through steam injection boiler with high temperature recycled water as boiler feed water to solve the problem of low thermal efficiency of steam injection boilers with high temperature recycled water used as boiler feed water

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