Poly-generation utilization system of oil shale with highly-volatile coal and process of system

Abstract

The invention discloses a poly-generation utilization system of oil shale with highly-volatile coal. The poly-generation utilization system comprises a stock bin, a dry distillation furnace, an oil tank, an oil-gas separation device, a gas purification device, a high-temperature gas heating furnace, a gas storage tank, a gas burner, a low-temperature gas heating furnace, a gas turbine, a heat exchanger, a smoke pipe, a steam turbine, a circulating fluidized bed boiler and a feeding machine; a mixture of oil shale and highly-volatile coal is utilized for conducting dry distillation. The invention further discloses a process, the process includes the steps that the gas storage tank divides combustible gas into three parts; the first part serves as a gas heat carrier; the second part serves as fuel for being burned in the gas burner, and the generated high-temperature smoke is used for heating the gas heat carrier in the high-temperature gas heating furnace; the third part is sent to the steam turbine for being burnt, and the generated high-temperature smoke does work and then enters the low-temperature gas heating furnace for heating the gas heat carrier. According to the poly-generation utilization system and the process, the oil shale and the highly-volatile coal are mixed and subjected to dry distillation, the yield of the combustible gas is raised, and the purposes of burning and heat supply, mass transfer and heat carrying of the combustible gas are achieved.

Description

technical field [0001] The invention belongs to the technical field of oil shale resource utilization, and in particular relates to a polygeneration utilization system of oil shale with high volatile coal and a process thereof. Background technique [0002] Oil shale is an important unconventional oil and gas resource with huge reserves. After pyrolysis in a retort device at 400-600 °C, shale oil with properties similar to natural oil can be obtained. In the era of tight crude oil supply in the world, it has been As a very important petroleum supplementary energy. At present, the world's proven shale oil reserves are more than 400 billion tons (calculated based on in-situ reserves of oil shale), far higher than the world's proven recoverable reserves of crude oil. my country is a country with large reserves of oil shale resources. The proven reserves of oil shale resources are 719.937 billion tons, and the reserves converted into shale oil are 47.644 billion tons. [0003]...

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Problems solved by technology

[0004] Invention patent CN200810013088.5 discloses a gas full cycle oil shale graded retort process and device, which uses semi-coke mixed gas combustion to provide heat for the oil shale retort furnace, but the semi-coke in this process needs to be water-cooled before combustion, so that It causes water pollution and waste of sensible heat of semi-coke. At the same time, the calorific value of semi-coke soaked in water is relatively low, and it is difficult to burn.

The published patent CN201210189395.5 and the invention patent CN201110443734.3 respectively proposed a gas-solid combined heat-carrying oil shale fluidized bed retort system and an oil shale rotary kiln retort and circulating fluidized bed combustion process. Rock ash is used as a solid heat carrier for oil shale retort, but the transmission of high-temperature shale ash is relatively difficult. At the same time, too much shale ash will cause strong adsorption to the retort products of oil shale, thus making the shale oil yield reduce

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