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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Temperature and electrical conductivity stratification in the underground coal gasification zone and surrounding aquifers at the Majuba pilot plant
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Temperature and electrical conductivity stratification in the underground coal gasification zone and surrounding aquifers at the Majuba pilot plant

机译：Majuba Pilot植物的地下煤气化区和周围含水层中的温度和导电性分层

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摘要

Underground coal gasification (UCG) is a chemical process that converts coal in situ into a gaseous product at elevated pressures and temperatures. UGC creates an underground cavity that may be partially filled with gas, ash, unburned coal, and other hydrocarbons. A water stratification assessment can help assess the diffusion effects within the underground cavity. In this study we assessed the stratification by comparing the electrical conductivity (EC) profiles of background boreholes to the verification borehole that was drilled after gasification was complete. Stratification was seen in all boreholes, including the cavity borehole. The EC levels were lower in the cavity, which may be due to the dilution induced by injecting surface water during quenching of the gasifier. The thermal gradients showed a steady increase in temperature with depth, with higher temperatures measured in the verification borehole. This temperature increase suggests that heat is still being retained in the cavity, which would be expected. This study serves as the preliminary investigation of the stratification of temperature and EC, and will be followed by in-depth surveys that cover all the groundwater monitoring wells in the different aquifers at the site.
机译：地下煤气化（UCG）是一种化学过程，将原位的煤转化为气态产品，在升高的压力和温度下。 UGC创造了一个地下腔，可以部分地填充气体，灰，未燃烧的煤和其他烃。水分分层评估可以帮助评估地下腔内的扩散效果。在该研究中，我们通过将背景钻孔的电导率（EC）曲线与钻井完成后钻井的验证钻孔进行比较来评估分层。在所有钻孔中看到分层，包括腔钻孔。腔体中的EC水平较低，这可能是由于在气化器淬火期间注入地表水引起的稀释度。热梯度显示温度稳定增加，深度，在验证钻孔中测量较高的温度。该温度升高表明，热量仍然保留在腔中，这将是预期的。本研究用作温度和欧共体分层的初步调查，随后将深入调查，涵盖本地不同含水层中的所有地下水监测孔。

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