The disadvantage of using compressed natural gas in gas powered vehicles is large volume of storage tanks and their great weight. Therefore, search one for new technical solutions that would eliminate these deficiencies. One of them is the use of appropriate adsorption materials filling in storage tanks for compressed natural gas, which under certain conditions lead to increase storage capacity. In the article is described the testing of three different commercially manufactured adsorbents based on activated carbon to increase the storage capacity of natural gas cylinders. There were obtained the results of the increasing storage capacity of pressure tanks for natural gas by their filling with the activated carbon AP4-60 (Calgon Carbon Corporation), activated carbon C46 (Silcarbon Aktivkohle) and BAC (KUREHA Corporation). Also decreasing of the storage capacity used adsorbents was monitored caused as the influence of irreversible sorption of higher hydrocarbons, odorants and other substances contained in natural gas in the pores of used adsorbents.
It was found that in the pressure range of up to 5 MPa usage all three adsorbents leads to increased storage capacity cylinders filled with adsorbent in comparison with a nonfilled pressure cylinder of the same volume. By the gas pressure of 5 MPa is the storage capacity of the tank in case of adsorbed natural gas increased by about 25 – 50 % of the storage capacity in case of compressed natural gas. At a pressure of 1 MPa makes this increase approx. 130 – 170 %.
Research presented in this article proves that woodchips addition significantly negatively influences limestone-based flue gas desulfurization process. This work focuses on the reduction of the adsorption reactivity of two types of calcined limestone that were used for capturing sulfur dioxide from flue gases originating from woodchips and brown coal cocombustion in a fluidized-bed combustor.
The mathematical formulation of time dependency of pulverized coal burnout is one of many CFD model parameters. The drop tube furnace is device used to obtain the time dependency of pulverized coal burnout. In order to solve the CFD model of pulverized coal combustion, it´s necessary to get knowledge of initial and boundary conditions of experimental measurement. These conditions can vary and one must know which variation can be neglected. This paper focus on the variation of conditions and it´s trying to calculate them. The sample of solid fuel is lignite of mine Libouš in north-western Bohemia.
There were demonstrated how to obtain the suite of lignite particles approaching to monodisperse. It´s obtained by air washing and separation of much finer particles.
There were presented simple experiment on particle dimensional analysis and calculation of particle sphericity (phi=0.8). Results of experiment were compared with Appalachian hard coal particles (phi=0.78).
In the end there is little discussion around combustion influence to changes of concentration O2 during thermokinetic measurements. The greatest decrement of O2 during thermokinetic measurement by 1200°C and at-mospheric pressure is 0,09% vol.
Method of thermokinetic measurements organized in Ostrava is comparable with methods of other laboratories. However there are differences in details, so before comparison the burnout characteristics must be calcu-lated influence of these differences. For example in Ostrava is used mixture of air and CO2 actually, but in another laboratory is used mixture of air and N2.
In paper [3] was found statement: increment of relative motion causes increment of fuel oxidation rate. There were also discussed similarity of conditions real boiler furnace and conditions of experimental apparat (drop tube furnace). During last two years there were done many experiments with synthetic jet which were focused on:
- Identification of flow character changes,
- Visual inspection of coal particle motion,
- Thermo-acoustic measurement,
- Thermo-kinetic measurement.
There weren`t identified difference: of flow character, visual inspection of coal particle motion, thermo-kinetic measurement during measurement with or without noise. Nevertheless thermo-acoustic measurement verify noise intensity inside reactor of drop tube furnace.
Explanation of these results were found in simple mathematical model of relative motion between elementary volume of reacting gas and small coal particle and shape of O2 concentration contours.
Experiments with synthetic jet on drop tube furnace reactor were absolved in order to approach the experiment conditions to conditions inside furnace of real steam boiler. Next potential step in approaching experiment conditions with conditions inside real furnace of modern steam boiler could lead to the application of air supplying in 2 levels (in 2 other levels of height).