Coal sample gas desorption volume determination device and method

The invention discloses a coal sample gas desorption volume determination device and method. The determination device comprises a reaction mechanism and a determination mechanism which communicate with each other, wherein the determination mechanism comprises a first pressure guide pipe, a flow measuring pipe and a second pressure guide pipe which communicate sequentially, a gas flow sensing module is arranged in the flow measuring pipe, and a gas outlet end of the second pressure guide pipe is provided with an exhaust port used for discharging gas out. During determination, equipment installation and verification are performed firstly, then a coal sample reaction is performed, then a valve is opened for a coal sample test to acquire the gas desorption volume, and finally the valve is closed. Through the determination device and method, a traditional drainage method can be replaced for determination while gas desorption volume determination is performed rapidly and efficiently, the accuracy of a desorption vo