Method for preheating and dehydrating coal as fired by hot exhaust gas

Abstract

The invention discloses a method for preheating and dehydrating coal as fired by hot exhaust gas. The method comprises the following steps that 1, hot exhaust gas obtained by combustion enters into an exhaust gas chamber from a hot exhaust gas feeding passage of a preheating device, then enters into an exhaust gas gathering annular passage by an exhaust gas preheating passage, and then is discharged from a main exhaust gas outlet of the exhaust gas gathering annular passage, wherein the hot exhaust gas obtained by combustion can heat air in a preheating chamber so that coal as fired falling into the preheating device is preheated; 2, the hot exhaust gas is fed into an exhaust gas feeding passage in an exhaust gas cooling fin by a main hot exhaust gas inlet pipe of an exhaust gas dehydrater, then enters into a main dehydration exhaust gas outlet pipe by a dehydration exhaust outlet passage in the exhaust gas cooling fin and then is discharged from the main dehydration exhaust gas outlet pipe; and 3, simultaneously, blended coal as fired is fed into a receiving hopper located at an upper part of a dehydrater shell by a bucket elevator, and falls into a coal bunker through the exhaust gas cooling fin, wherein the coal as fired is subjected to heating dehydration drying when falling into the coal bunker through the exhaust gas cooling fin. The method provided by the invention can realize preheating and dehydration of coal as fired by hot exhaust gas obtained by combustion.

Description

technical field [0001] The invention relates to a method for preheating and dehydrating coal fed into a furnace, in particular to a method for preheating and dehydrating coal fed into a furnace with hot waste gas. Background technique [0002] At present, most coal pyrolysis furnaces (coke ovens) on the market adopt batch-type coking, and the process steps such as the proportion of coal into the furnace, dehydration, coal feeding, preheating, carbonization, coke reforming, and CDQ are relatively independent and cannot be carried out. Continuous production, low production efficiency; In addition, the raw coal gas produced in the coal pyrolysis process contains many useful components, such as H 2 S, HCH and other acid gases, NH 3 Alkaline gas, tar, benzene, naphthalene, washing oil and other organic substances do not have a complete process for exporting, recovering and purifying raw gas. [0003] This impels the inventors to explore and innovate a complete set of continuous...

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Problems solved by technology

[0002] Most coal pyrolysis furnaces (coke ovens) currently on the market adopt batch-type coking. Coke upgrading, dry quenching and other process steps are relatively independent, continuous production cannot be carried out, and production efficiency is low; in addition, the raw coal gas generated during coal pyrolysis contains many useful components, such as H2S , HCH and other acid gases, NH3 basic gas, tar, benzene, naphthalene, washing oil and other organic substances, there is no complete process for exporting, recycling and purifying raw gas

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