Integral purified integration system and process of lignite in cement production through catalytic mild pyrolysis

Abstract

The invention discloses an integral purified integration system and process of lignite in cement production through catalytic mild pyrolysis. The system comprises a cement firing system, a crusher, a pre-drying machine, a roll squeezer, a catalyst storage bin, a drying crusher, a vertical drying cylinder and a cyclone separator. The process sequentially comprises the following steps of: (1) initially crushing raw coal of the lignite into coal briquettes; (2) pre-drying the coal briquettes and rolling to crush the coal briquettes to form coal particles; (3) crushing the coal particles to be coal powder through the drying crusher; (4) carrying out heat exchanging, drying and purification on the fine coal powder through the vertical drying cylinder; and (5) separating the purified lignite from the gas through the cyclone separator to obtain a purified lignite finished product. The invention has the advantages that the afterheat in the cement production is fully utilized so as to save energy, reduce consumption and decrease the emission of carbon dioxide; and by utilizing the original process equipment, in the cement production, an additional device is not needed, therefore, the investment is less and the profit is great, and 10,000,000 Yuan on 2500T / d cement production line can be saved every year.

Description

technical field [0001] The invention relates to an integrated system and process for catalytic mild pyrolysis and upgrading of lignite, in particular to an integrated integrated system and process for classifying and upgrading lignite by using waste gas generated by a cement burning system. Background technique [0002] According to statistics, the world's lignite reserves are about 2622.9 billion tons, accounting for about 24.4% of the world's total coal reserves. China has discovered lignite resources of 210 billion tons, accounting for about 13% of China's coal reserves. Because lignite is formed very shallow from the surface, it is suitable for open-pit mining, so it is cheap. But lignite also has the following outstanding problems: [0003] 1. High moisture and low calorific value. Lignite generally has a water content between 30% and 65%, and its general calorific value is about 3000kcal / kg; 2. Low density, easy to weather, spontaneous combustion when exposed to wate...

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Problems solved by technology

[0005] In short, the existing lignite upgrading technology has the following disadvantages: 1. The existing lignite upgrading technology needs to provide a separate heat source, high energy consumption, increased production costs, and increased carbon dioxide emissions; 2. In the existing lignite upgrading technology During the production process, more coal tar will be produced, which will not only block the upgrading process pipeline, but also make the upgraded lignite calorific value low; , lignite upgrading is prone to explosion; 4. Some technologies require high pressure, which increases equipment investment and technical requirements. The large investment scale and high equipment requirements are difficult for enterprises to bear, and it is difficult to realize industrialization;

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