Medium internal circulation enhanced thermal desorption soil remediation reactor and method thereof

A medium internal circulation enhanced thermal desorption soil remediation reactor, comprising a feeding device with a raw soil inlet, a feeding end fixing cover, a rotary drum and a discharging end fixing cover with a treated soil outlet, wherein a thermal medium is provided in the rotary drum, a discharging end of the rotary drum is provided with a material blocking sieve plate configured to separate soil from the thermal medium, a collecting groove in inclined arrangement is provided on the discharging end fixing cover, and a groove body of the collecting groove passes through the material blocking sieve plate to go deep into the rotary drum so that the thermal medium lifted up by shovelling plates is able to fall into the groove and roll onto a track formed by internal pipe bundles;

• an outer cover with 2 smoke gas inlets and 1 smoke gas outlet is provided at the outer side of the rotary drum, the internal pipe bundles are disposed in an inner cavity of the rotary drum, a smoke gas inlet of the internal pipe bundles communicates with the smoke gas inlet of the outer cover, and the smoke gas outlet of the internal pipe bundles communicates with the smoke gas outlet in the outer cover;
• an area between the outer side of the rotary drum and the inner side of the outer cover is a smoke gas jacket, the other smoke gas inlet of the rotary drum communicates with the smoke gas jacket, and the smoke gas outlet of the rotary drum is disposed above the feeding end fixing cover;
• a feeding end of the reactor is higher than a discharging end in height, and an angle θ between an axis of the rotary drum and a horizontal line is 1° to 3°;
• and
• the shovelling plates located at tail portions of the internal pipe bundles and being of L-shaped sieve screen structures are provided in the rotary drum, the shovelling plates are uniformly distributed in the circumferential direction along the tail portion of the rotary drum and are located in front of the material blocking sieve plate, and the sieve screen structures of the shovelling plates are configured to separate the soil from the thermal medium.