CALCULATION OF DURATION OF EMPTYING THE PROCESSING EQUIPMENT THROUGH RELEASE STACKS

The proposed mathematical description of the key parameters and conditions of the processes of emptying the processing equipment by releasing dangerous gases from it with the account of nonstationarity of the processes allowed to obtain equations for determination of duration of the gas efflux from the equipment before its full emptying in cases of subcritical and critical efflux velocities. The proposed two methods of determining the time of emptying the equipment, through reducing mass of the gas (m) and through pressure dumping (P), give divergences in the results about 1–2 %. The obtained analytical dependences allow determining flow parameters at the stack tip (pressure, mass flow rate, temperature, density, speed) depending on time. The use of these dependences as boundary conditions for calculation of gas releases in such software packages as Fluent [1, 6], allows for adequate calculating the process of propagation of the air-gas mixture in the atmospheric surface layer at releasing dangerous gases from the industrial tanks and vessels in cases of shutdowns of technological systems for repairs or at emergencies.