The Experimental Research Of Oil Shale Decomposition At Low Temperature

From the last century since the mid-and around the world demand for energy is more and more big, the traditional oil energy is gradually cannot meet the demand for oil resources is highly dependent on the world economy. And oil shale is widely regarded as a kind of potential resources, to become the world’s conventional oil resources are the most ideal alternative energy sources. And in today’s world, countries already will be the main direction of energy development in the oil shale, because shale development extremely practical significance, the oil shale resource development can address the current world for a long time is gradually facing the shortage of oil resources, at the same time, for the moment can also reduce dependence on imported oil.This experiment using Beijing bo abyss precise science and technology development co., LTD production of DTU-2-b thermogravimetric analyzer on microgravity experiment of daqing mining area of oil shale samples, in the final temperature350℃, due to the low final temperature temperature, internal structure of oil shale interlayer water and water as the main composition of precipitation, in addition, before the parent rock cracking oil also will produce a series of physical change, accompanied by a parent rock part cracking, oil and gas, produced by decomposition of sodium bicarbonate in the stage of the oil shale of weightlessness rate at about5%. In400℃～550℃stage were the main pyrolysis stage, the inside of the oil shale gradually decompose hydrocarbons, oil gas and steam to escape. Kerogen begins to soften, molecules begin to restructure, and is accompanied by some gas production, oil source rocks before cracking of tar physical change gradually. Are mainly concentrated in the precipitation of volatile phase and temperature above450℃. In this range, shale has a focus on pyrolysis characteristics, due to the large amounts of organic matter in the oil shale pyrolysis, the weight loss is very big, at this stage, the oil shale of the weightlessness rate of about20.62%on average. In temperature at and above600℃and the constant temperature stage, in this temperature range, is generally regarded as contained in the oil shale gradually with different carbonate in cracking. For example containing such as calcite, dolomite, etc., in addition, the shale contains fixed carbon also by high temperature carbonization, produce certain gases and volatile, leading to the final heat. Are more likely at this stage the weightlessness rate of oil shale, oil shale of the weightlessness rate at about5.17%. Reason for liquid fuel, for the purpose, the oil shale of low-temperature carbonization eventually heating temperature is450℃550℃advisable choice.Used in daqing in situ during mining of mining area is suitable for use by the pyrolysis temperature and heat preservation time should adopt the following two conditions:(1) terminate the temperature controlled at500℃, holding constant temperature time control in60minutes advisable.(2) terminate the temperature controlled at450℃, holding constant temperature time control in120minutes advisable.As the experimental temperature rising, daqing oil shale bulk density decreases, and its bulk density at temperature over400℃after falling rapidly as the temperature continues to rise. Can get from this, in the daqing oil shale pyrolysis products mainly in the400-500℃temperature range of output. Daqing mining area of the density experiment reflected the nature of the oil shale mining area, in the mining area of oil shale distillation using, according to the appropriate temperature pyrolysis temperature range, so as to achieve efficient and economic exploitation. And the moisture content of different are of no effect on the main pyrolysis stage.Through the simulation study of in situ oil shale mining heating process, the following major conclusions:(1) with the extension of heating time, the in situ oil shale exploitation of energy consumption effectively reduce gradually, reflect the of energy effective utilization rate decrease with the increase of heating time.(2) the in situ oil shale mining process of high efficiency, the one-sided raise the temperature of steam injection, did not significantly improve shale energy effective utilization. Injecting steam pressure is higher than that of injected steam temperature.(3) analysis:steam pressure3.0MPa, steam temperature and solution:680steam pressure3.5MPa, steam temperature of580℃shorter running time, low energy loss, should be preferred as the actual runtime package. Specific operation time was2.8years and3years respectively, energy loss were1.50e+12e+12KJ and1.58KJ.