An underground combustion heater for in-situ heating of underground mineral resources

Abstract

The invention discloses an underground combustion heater used for in-situ heating of underground mineral resources, belonging to the technical field of in-situ heating and exploitation, comprising a gas injection system, a combustion system and a tail gas return preheating system, and the gas injection system is used to ensure that the gas and the The combustion air is fully mixed to form a mixture and then injected into the combustion heater. The combustion system includes the combustion chamber tube, the baffle, the ignition needle support, the ignition needle, the porous aluminum foam and the lower end cover of the combustion chamber. The exhaust gas return preheating system is one. On the one hand, the backflow of the high-temperature exhaust gas can exchange heat with the porous aluminum foam through the combustion chamber tube to ensure the temperature of the porous aluminum foam; Heat exchange, preheating the mixture to improve the combustion efficiency of the gas. The invention can continuously heat the porous aluminum foam supporting the catalyst, and preheat the gas injected into the burner to improve the efficiency of the catalytic combustion of the gas.

Description

technical field [0001] The invention belongs to the technical field of in-situ heating and mining, and in particular relates to an underground combustion heater for in-situ heating of underground mineral resources. Background technique [0002] Unconventional oil and gas resources such as oil shale, heavy oil, tight oil, and natural gas hydrate are important strategic resources. Unconventional oil and gas resources such as oil shale, heavy oil, tight oil, and natural gas hydrate can be realized through downhole in-situ heating. Mining is considered the most efficient method. [0003] It is an effective downhole in-situ heating method to inject the high-temperature tail gas generated by hydrocarbon gas combustion into underground to heat the target formation. In this method, the combustion gas and the supporting gas are respectively fed to the heater at the bottom of the well through a supercharger on the surface, and the two gases are combusted in the combustion chamber of ...

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Problems solved by technology

However, this method must ensure that the temperature of the aluminum foam that supports the catalyst is always maintained at about 500°C to ensure that the hydrocarbon gas can react; Insufficient heat exchange of aluminum causes part of the gas to fail to reach the reaction temperature, thereby reducing the utilization efficiency of the gas

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