Internal circulation automatic switching equipment of coal gasification system

The utility model discloses internal circulation automatic switching equipment of a coal gasification system. The internal circulation automatic switching equipment comprises an inert pressurizing device, a high-pressure flash tower and a high-temperature hot water tank, the inert pressurizing device is connected with the high-pressure flash tower; and the high-pressure flash tower is connected with the high-temperature hot water tank. Wherein a first pressure detection device is arranged on the high-pressure flash tower, the high-pressure flash tower is further connected with a water supplementing device, the high-temperature hot water tank is connected with the high-temperature hot water pump, the high-temperature hot water pump is connected with the washing tower, and a second pressure detection device is arranged on the washing tower. And the first pressure detection device and the second pressure detection device are connected with the DCS control device. The device can be automatically controlled to rea