2. The height of the adsorption bed is 0.8m and the cross-sectional area is 1.4m2, The operating condition is 313k, 1.2x10^5Pa. The inlet air flow is 4kg / min and the pollutant concentration is 0.0030kg/m3.The adsorption isotherm conforms to the ferodrich equation, in which the constants K and N are 0.0876 and 1.8 respectively. The calculated density of adsorbent is 400kg/m3 and the mass transfer coefficient is 25s^-1. Calculate:

(1) Adsorption rate;

(2) Protective action time.

(3) regenerate the adsorption bed in the question with saturated steam. The operating temperature is 453k, the steam flow is 10kg / min, and the mass transfer coefficient of the process is 25s-1. The values of constants K and N in the ferodrich equation are 0.0398 and 2.2 respectively. Try to estimate the time required for the regeneration process.