Method for upgrading coal pyrolysis

A technology of coal pyrolysis and pyrolyzer, which is applied in direct heating dry distillation, gas dedusting, petroleum industry, etc. It can solve the problems of low tar quality, low heat utilization rate, poor pyrolysis dedusting effect, etc., and achieve high dedusting efficiency, Simplify operation and solve the effect of tar dust clogging

Active Publication Date: 2009-12-23
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an improved coal pyrolysis upgrading method to overcome the defects of low heat utilization rate, poor pyrolysis dedusting effect and low tar quality in the prior art

Method used

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  • Method for upgrading coal pyrolysis
  • Method for upgrading coal pyrolysis
  • Method for upgrading coal pyrolysis

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Baorixile lignite with a particle size of ≤30mm (see Table 1 for coal quality analysis data) is continuously fed into the rotary dryer at a rate of 1.5t / h, and flows through the rotary dryer in parallel with hot flue gas at a temperature of about 460°C. During this process, the lignite and the hot flue gas exchange heat directly, and the moisture contained in the lignite is removed as much as possible. In the rotary dryer, the lignite raw material and the hot semi-coke from the pyrolyzer are subjected to indirect heat exchange at the same time, the raw coal and the hot flue gas flow through the inner sleeve, and the hot semi-coke flows through the inner sleeve and the inner sleeve of the rotary dryer. The annular space formed between the outer cylinders. Finally, the lignite is heated to about 130°C, the moisture in the lignite is reduced to about 4%, and the hot semi-coke is cooled to about 180°C.

[0051] The dried lignite at about 130°C and the hot semi-coke at abou...

Embodiment 2

[0058] Raw material coal that present embodiment adopts, test device are identical with embodiment 1, and main operation step is also substantially identical with embodiment 1, and main difference is as follows:

[0059] The lignite is continuously fed into the rotary dryer at a rate of 1.5t / h, and is exchanged with hot flue gas at a temperature of 440°C for dehydration. Finally, the lignite is heated to 110°C, its moisture is reduced to about 6%, and the semi-coke product is cooled to Around 220°C.

[0060] The dried lignite and the hot semi-coke at about 750°C from the heating rotary kiln are mixed with a screw mixer at a weight ratio of 1:6 and then sent to the moving bed pyrolyzer. The lignite raw material and the high-temperature semi-coke are directly exchanged and Pyrolysis occurs to generate hot semi-coke and gas containing tar vapor, and the final pyrolysis temperature is about 650°C.

[0061] The gas containing tar vapor generated in the moving bed pyrolyzer is sent...

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Abstract

The invention provides a method for upgrading coal pyrolysis, comprising the following steps: (a) sending raw coal with granularity being less than and equal to 30mm into a rotary drier, so that the raw coal and hot flue gas are connected with each other by the means of parallel flow and directly change heat, and the raw coal exchanges heat indirectly with hot semicoke from a pyrolyzer in the rotary drier, to dry the raw coal; (b) mixing the dried raw coal with the high-temperature semicoke from a heating rotary kiln and sending the mixture into the pyrolyzer, wherein the coal material directly changes heat with the high-temperature semicoke and pyrolyzes to generate hot semicoke, tar steam and coal gas, wherein final pyrolyzing temperature is 500 DEG C-700 DEG C; and (c) sending a part of the hot semicoke generated into the heating rotary kiln for processing by means of heating, and sending the rest part of the hot semicoke into the rotary drier for exchanging heat directly with the raw coal. The method for upgrading coal pyrolysis has flexible operation, wide granularity range of the coal material, good quality of the generated semicoke and the generated tar, high cascade utilization of energy and high system thermal efficiency, properly solving the technical problems such as dust and tar blocking, high dust content in the tar, etc.

Description

technical field [0001] The invention relates to a coal pyrolysis upgrading method, more specifically, a low coalification degree coal pyrolysis upgrading method. Background technique [0002] Coal with low degree of coalification refers to lignite and bituminous coal with a low degree of metamorphism. Among them, low-metamorphic bituminous coal includes long-flame coal, non-caking coal, weakly caking coal, gas coal, etc., and its total amount accounts for more than 50% of my country's coal reserves. The characteristics of coal quality are: high volatile content, low-temperature pyrolysis tar yield High chemical reactivity, high comprehensive development and utilization value. Pyrolysis (or dry distillation) is a commonly used coal processing and utilization technology. Since the 1970s, the development of coal pyrolysis upgrading technology has generally received attention, and researchers have successively developed a variety of processes. [0003] Canada UMATAC Industrial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B49/18C10B57/10C10B43/04C10K1/02
Inventor 郭治杜铭华杜万斗霍卫东张翠清麻林仝胜录王晓雷
Owner CHNA ENERGY INVESTMENT CORP LTD
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