Efficient and energy-saving gas thermal desorption equipment

Abstract

The invention provides efficient and energy-saving gas thermal desorption equipment. A heating well is provided with an outer radiation pipe and an inner pipe which are mutually sleeved and form a backflow gap, and a heat exchanger is arranged above the inner pipe; a burner is arranged above the heating well, sprayed high-temperature flue gas can reach the bottom of the heating well through the inner pipe, the burner has a gas inlet, a combustion-supporting air inlet and a smoke exhaust port, wherein the gas inlet is connected with a gas station, the outer side of the combustion-supporting airinlet is communicated with a combustion-supporting fan, the inner side of the combustion-supporting air inlet is communicated with a combustion chamber of the burner through the heat exchanger, the smoke exhaust port is connected with a smoke exhaust fan and is used for discharging flue gas at the top of the heating well. A gap is left between the heat exchanger and the top of the inner pipe to form a flue gas return channel. According to the invention, the flue gas backflow channel is adopted, so that the combustion can be more complete, the nitrogen oxide content in the flue gas can be reduced, and the overall temperature of the heating well can be more uniform.

Description

technical field [0001] The invention relates to an in-situ thermal desorption device for repairing pollutants (such as polluted soil), in particular to a gas thermal desorption device. Background technique [0002] Gas thermal desorption technology is an important part of in-situ thermal desorption. Its advantages include wide range of remediation pollutants, short remediation time, and thorough remediation effect. [0003] However, due to the particularity of this technology, compared with other in-situ thermal desorption technologies, there are problems such as uneven heating well temperature, large exhaust heat loss, insufficient gas combustion, and substandard flue gas emissions, which in turn lead to overuse of the site. Heating, heat energy utilization effect is poor, and additional exhaust equipment is required to deal with non-standard exhaust gas, which increases operating costs. [0004] In addition, since the gas thermal desorption technology uses gas as the medi...

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Problems solved by technology

[0003] However, due to the particularity of this technology, compared with other in-situ thermal desorption technologies, there are problems such as uneven heating well temperature, large exhaust heat loss, insufficient gas combustion, and substandard flue gas emissions, which in turn lead to overuse of the site. Heating, heat energy utilization effect is poor, and additional exhaust equipment needs to be installed to deal with non-standard exhaust gas, which increases operating costs

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