The Distribution of Terrestrial Heat Flow and its Structural Control in the Huainan‐Huaibei Coalfield

Abstract

On the basis of the results of the thermal conductivity of 127 rock samples in the tested coal measure strata and combining 59 reliable system temperature measurement data in mine field, we calculated out the heat flow values in Huainan-Huaibei coalfield and drew the distribution map of terrestrial heat flow. The results show that the heat flow values in Huainan-Huaibei coalfield range from 29.7 to 83.9 mW·m −2 and the average is 58.3 mW·m −2 . There is a certain difference compared to other energy basins and the heat flow value in Huainan coalfield which is 63.7 mW·m −2 is much higher than that in Huaibei coalfield which is 55.2 mW·m −2 . Through comprehensive analysis, we come to the conclusion that the difference between the terrestrial heat flow in study area and the one in other basins, and the phenomenon that the heat flow value in Huainan coalfield is higher than the one in Huaibei coalfield are controlled by tectonic evolution and regional geological background. And the reasons of heat flow maldistribution in study area is mainly influence of the geological structure on the geothermal field. Especially, the influence of nappe tectonic on the difference of current heat flow values on upper and lower side is very obvious.

Terrestrial heat flow and geothermal field characteristics in the Bide-Santang basin, western Guizhou, South China

“…Thermal conductivity is a key thermophysical property of rocks and a necessary parameter for calculating terrestrial heat flow (Luo et al, 2011;Peng et al, 2015aPeng et al, , 2015bSun et al, 2006). To fully understand the thermal conductivity of the Upper Permian coal-bearing strata in the Bide-Santang basin, 43 coal and rock samples were acquired and tested for their thermal conductivity, with sampling depths ranging from 120 to 500 m. The rock samples were taken from borehole SJ101, and the coal samples were obtained from surface coal from different coal mines in the Bide-Santang basin (Figure 1(d)).…”

Fuel Common Rail Injection System of RT-Flex Marine Intelligent Diesel Engine and its Simulation Dynamic Model

“…With the coming of "low-carbon economy" era and International Maritime Organization (IMO) being increasingly strict with the standard of exhaust emission, intelligent diesel engine with common rail is the future developing direction [1], it will gradually replace the traditional marine diesel engine. Owning to the special structures in fuel oil and exhaust system [2], which have been used in RT-flex marine diesel engine, for example, electronic control fuel injection system, electronic control variable exhaust timing and adjustable fuel pressure in common rail, these structures and technologies have been changing the original calculating and analysis methods of fuel injection system, applied in fuel pump-pipe-fuel injector for the traditional diesel engine. Therefore, with the help of computer and in order to obtain a more accurate simulation data, it is necessary to find appropriate way to build up the simulation model of fuel common rail injection system, to study this system working pressure's impact factors, which is caused by the changes in different operating conditions (revolving speed, load, etc.)…”