Lignite upgrading treatment device

Abstract

The invention discloses a quality-improving treatment device for brown coal. The device comprises two hot wind channels which are arranged in opposite directions and more than two first heat conducting units which are arranged between the two hot wind channels, wherein each of the first heat conducting units comprises two rows of heat conducting groups which are arranged at intervals to form a dry distillation gas exhaust channel, and two adjacent first heat conducting units are arranged at an interval to form a material channel; each of the heat conducting groups comprises a plurality of first heat conducting tubes which are substantially arranged along the horizontal direction and first fins which are connected between two adjacent first heat conducting tubes, part of or all the first fins are provided with dry distillation gas exhaust openings, second fins are further arranged outside the dry distillation gas exhaust openings, and the second fins shield the dry distillation gas exhaust openings; a plurality of second heat conducting tubes are arranged in the material channel, each of the second heat conducting tubes is substantially arranged along the horizontal direction and the plurality of second heat conducting tubes are distributed longitudinally in the material channel in a staggered manner; and two ends of the first and second heat conducting tubes are respectively connected with the two hot wind channels.

Description

technical field [0001] The invention relates to the technical field of coal upgrading treatment, in particular to a lignite upgrading treatment device. Background technique [0002] At present, coal, as a major resource, has been widely concerned about its development and utilization. In China, coal is divided into the following types according to the degree of coalification from low to high: lignite, low-metamorphic bituminous coal, medium-metamorphic bituminous coal, lean coal, and anthracite. Among them, lignite is the coal with the lowest degree of coalification, accounting for about 40% of the global coal reserves. %, accounting for 13% of China's coal reserves, the reserves are extremely huge. [0003] Nowadays, coal with a higher degree of coalification in coal resources has been exploited in large quantities, while some coal with a lower degree of coalification, such as lignite, has high moisture content (about 20% to 60%), low calorific value, easy weathering and s...

AI Technical Summary

Problems solved by technology

[0003] Nowadays, coal with a higher degree of coalification in coal resources has been exploited in large quantities, while some coal with a lower degree of coalification, such as lignite, has high moisture content (about 20% to 60%), low calorific value, easy weathering and spontaneous combustion. , the transportation cost per unit of energy is high, which is not conducive to long-distance transportation and storage

At the same time, due to the low thermal efficiency of direct combustion of lignite and the large amount of greenhouse gas emissions, it is difficult to develop and utilize large-scale, so it is largely idled.

[0004] In the prior art, there are three types of upgrading treatment systems for lignite. The first is to use hot air to directly contact lignite and dry it. This method uses air and water vapor as carriers, and the drying temperature is low, the thermal efficiency is low, and the degree of drying is low. Low, easy to ignite and burn, and will also take away the high calorific value volatiles in the lignite. This system uses hot air to directly dry the lignite, so the lignite processed at one time cannot be piled up too much, otherwise the lignite inside cannot be heated at a suitable temperature. Therefore, the processing capacity is small, and lignite cannot be upgraded on a large scale; the second method is to use coke oven to process lignite, but coke oven treatment is intermittent operation on the one hand, which causes great environmental pollution, and on the other hand Gases, dust and other substances produced during the treatment process that affect the reforming temperature and thus affect the reforming effect cannot be discharged in time, so that the coal everywhere can not be reformed at an appropriate temperature. In other words, due to the process The gas in the gas cannot be discharged in time, so these processing mechanisms in the prior art cannot control the temperature in the processing process to obtain the required coal products

The third is to use vertically arranged heat transfer tubes. By passing hot air through the heat transfer tubes, lignite is in contact with or close to the heat transfer tubes to achieve drying and upgrading. This structure can make coal everywhere be improved at a suitable temperature. High-quality coal products can be obtained through quality treatment, but due to the problem of the heat pipe setting, the hot air path is small and the thermal efficiency is not high

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