Abstract
Experiments on the dissociation of a mixed gas hydrate in various combustion methods are performed. The simultaneous influence of two determining parameters (the powder layer thickness and the external air velocity) on the efficiency of dissociation is studied. It has been shown that for the mixed hydrate, the dissociation rate under induction heating is 10–15 times higher than during the burning of a thick layer of powder, when the combustion is realized above the layer surface. The minimum temperature required for the initiation of combustion for different combustion methods was studied. As the height of the sample layer increases, the rate of dissociation decreases. The emissions of NOx and CO for the composite hydrate are higher than for methane hydrate at the same temperature in a muffle furnace. A comparison of harmful emissions during the combustion of gas hydrates with various types of coal fuels is presented. NOx concentration as a result of the combustion of gas hydrates is tens of times lower than when burning coal fuels. Increasing the temperature in the muffle furnace reduces the concentration of combustion products of gas hydrates.
Highlights
Today, the explored reserves of methane in natural gas hydrate deposits significantly exceed the reserves of natural gas produced by traditional technologies that are not related to the gas-hydrate state [1,2,3]
This paper presents a comparison of concentrations of several types of gases during combustion of (1) mixed methane-propane hydrate, (2) methane gas hydrate, and (3) comparison with coal and water-coal mixtures
For the mixed gas hydrate, the dissociation rate has been compared for different combustion methods
Summary
The explored reserves of methane in natural gas hydrate deposits significantly exceed the reserves of natural gas produced by traditional technologies that are not related to the gas-hydrate state [1,2,3]. The phenomenon of “self-preservation” refers to abnormally low dissociation rates due to the formation of a high-strength ice crust on the surface of the granules This high-strength crust enables storing gas-hydrate raw materials for a very long time with insignificant losses of methane, as well as under conditions when the thermodynamic equilibrium is significantly disturbed [9,10,11,12]. Most studies on the combustion of the gas hydrate powder layer were made for methane hydrate and in the organization of a laminar air flow on the layer surface. This combustion is characterized by unstable behavior of the flame. Various Ways of Organizing the Dissociation and Combustion of Gas Hydrates
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