Gas desorption measurement device and desorption speed calculation method

The invention discloses a gas desorption measuring device and a gas desorption speed calculation method.The device comprises a buffer tank capable of adjusting the volume in the tank, a straight cylinder piston and a pressure balance mechanism, a piston component is arranged at one end of an inner cavity of the buffer tank, and the straight cylinder piston connected with the piston component adjusts the volume of the buffer tank under driving of the pressure balance mechanism; and a temperature thermocouple and a high-temperature-resistant pressure transmitter are also arranged in the tank. The data collector is electrically connected with the PLC, the temperature thermocouple, the high-temperature-resistant pressure transmitter and the electric pressure balance mechanism, and the PLC is electrically connected with the computer, the electric stop valve and the electric pressure balance mechanism. The volume in the tank can be automatically adjusted by matching the variable-volume buffer tank with the electric