Fire- and Explosion-Safe Low-Temperature Filling of an Adsorption Natural Gas Storage System

Thermodynamic Behaviors of Adsorbed Methane Storage Systems Based on Nanoporous Carbon Adsorbents Prepared from Coconut Shells

“…Since only the changes in the enthalpy are relevant, its reference value can be chosen arbitrarily and separately for each element of the ANG system. Thus, the enthalpy of the adsorbent–adsorbate system H a for isothermal equilibrium adsorption is calculated as follows [ 38 , 39 ]: where c c and c b are the specific heat capacities of regenerated carbon adsorbent without methane and a polymer binder, respectively; x is the mass content of a binder in the monolithic adsorbent; T is the temperature of the adsorption system; T 0 is the arbitrary reference temperature, for example, 273.15 K; a is the adsorption value reduced to a “pure” adsorbent without the binder, i.e., it corresponds to the plot in Figure 7 ; ρ p is the packing density of adsorbent on the volume of the system; V tank is the internal volume of the ANG tank.…”

“…Recently, the authors developed a mathematical model of the circuit charging process of a flow-type ANG storage system [ 33 ]. Therefore, a practical engineering solution for the ANG facilities must consider the thermal effects of adsorption/desorption [ 34 , 35 , 36 , 37 , 38 , 39 ]. In this context, thermodynamic functions of adsorption systems, operating under conditions of high pore filling with adsorbate at high pressures, i.e., the HEAS conditions are of particular interest [ 40 , 41 ].…”

Heat and Mass Transfer in an Adsorbed Natural Gas Storage System Filled with Monolithic Carbon Adsorbent during Circulating Gas Charging

“…Charging with the removal of adsorption heat to the environment takes longer but, due to a decrease in the temperature of the adsorbent, the amount of accumulated gas increases. Low-temperature charging [30] makes it possible to additionally cool the adsorbent after removing the heat of adsorption into the environment. Cooling during charging can significantly increase the amount of accumulated gas or significantly reduce The experimental setup is designed to determine the macroscopic performance indicators for charging of various types, the optimal charging modes, and the time dependencies of various parameters.…”

“…The efficiency of the heat transfer in the adsorber can be estimated by analogy with heat exchangers using the heat exchange efficiency coefficient K he , which is determined by the ratio between the actual heat flux and the maximum heat flux corresponding to an infinitely high heat transfer coefficient or an infinitely large heat exchange surface. The actual heat flux was determined from the theoretical dependences presented in [24,30] according to the rate of decrease in the measured temperatures of the adsorbent layer. Coefficient K he characterizes the balance between the charging mode and the surface area (structure) of the adsorbent monoliths.…”

“…The AU-1 adsorbent has the following structural-energy characteristics: a specific micropore volume W 0 = 0.62 cm 3 /g, a characteristic adsorption energy of benzene emphE 0 = 19.7 kJ/mol, and an average effective half-width of micropores x 0 = 0.61 nm. The manufacturing technology of shaped cylindrical monoliths from AU-1 activated carbon is described in [30]. Compared to the original granulated adsorbent, the packing density of the shaped material was increased from 380 to 705 kg/m 3 .…”