Steam-injection boiler

Abstract

The invention discloses a steam-injection boiler. The steam-injection boiler comprises a water processing unit, a smoke-water heat exchanger, a water-water heat exchanger, a combustor, a secondary heat storage chamber, an air blower, a first reversing valve, a second reversing valve, a third reversing valve and a steam-water separator. The steam-injection boiler can meet the requirement of thickened oil recovery, the smoke exhausting temperature can be reduced to 120 DEG C or below, the nitrogen oxide emission meets the emission standard, meanwhile, recovering of the heat of saturated water and water can be achieved, and only the high-quality steam is fed into a well.

Description

technical field [0001] The invention relates to a boiler, in particular to a steam injection boiler for heavy oil exploitation in an oil field. Background technique [0002] Steam injection boiler is the most widely used special steam injection equipment for mining heavy oil in oil fields. It uses the produced high-temperature and high-pressure wet steam to inject into oil wells to heat the crude oil in the oil layer to reduce the viscosity of heavy oil, thereby increasing the flow of heavy oil. It can greatly enhance the recovery of heavy oil. At present, the exhaust gas temperature of steam injection boilers burning natural gas is between 180 and 220 °C. If the exhaust gas temperature is too high, the thermal efficiency of the boiler will decrease. For every 10-15 °C increase in the exhaust gas temperature, the thermal efficiency will decrease by about 1%. In the high-temperature area, more nitrogen oxides are produced, which pollutes the atmosphere and does not meet envi...

AI Technical Summary

Problems solved by technology

At present, the exhaust gas temperature of steam injection boilers burning natural gas is between 180 and 220 °C. If the exhaust gas temperature is too high, the thermal efficiency of the boiler will decrease. For every 10-15 °C increase in the exhaust gas temperature, the thermal efficiency will decrease by about 1%. In the high-temperature area, more nitrogen oxides are produced, which pollutes the atmosphere and does not meet environmental protection requirements; the existing steam injection boiler injects saturated steam and saturated water into the well, the saturated water level is low, the heat released is insufficient, and waste valuable high-quality water

[0003] CN101463993A simply applies the regenerative combustion method to the steam injection boiler, removes the original convective heat transfer part, and only retains the radiation heat transfer part, without considering the step-by-step heating of the working medium, and the low-temperature water directly contacts the high-temperature flame through the furnace tube , the heat transfer process is not reasonable enough, and the available energy loss is relatively large

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