Decomposing furnace based on multi-fuel injection technology

A calciner and multi-fuel technology, applied in clinker production, cement production, etc., can solve the problems that affect the overall burnout rate of coal powder, high volatile content, and hinder the full combustion of coal powder, so as to improve the burnout rate, The effect of high burnout rate and high decomposition rate of raw meal

Active Publication Date: 2015-06-10
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when pulverized coal of different quality is co-combusted, the mutual influence is difficult to predict. Once the match is improper, it will affect the combustion status of the two pulverized coal, and finally directly affect the overall burnout rate of pulverized

Method used

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  • Decomposing furnace based on multi-fuel injection technology
  • Decomposing furnace based on multi-fuel injection technology
  • Decomposing furnace based on multi-fuel injection technology

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1: A cement clinker decomposition furnace with a daily output of 2000 tons

[0029] (1) Set the main fuel as high-quality coal and the secondary fuel as low-quality coal.

[0030] (2) The height position of the main fuel pulverized coal injection point A=h / 2;

[0031] (3) Only one main fuel nozzle 7 is provided, and its plane position is at point M in section AB, where the MOB angle is 20°;

[0032] (4) Set the secondary fuel nozzle 8 on the top surface of the swirl pre-combustion chamber 3;

[0033] (5) At this time, the model predicts that the overall fuel burn rate is 88%, and the calcium carbonate decomposition rate is 91%.

[0034] (6) When only the main fuel is injected, the comparison of the indicators in the two pulverized coal entry modes from the top of the swirl pre-combustion chamber 3 and side coal injection is shown in Table 1.

[0035] Table 1 Index comparison of 2000 tons of cement clinker calciner per day under two injection methods

[0036]

Example Embodiment

[0037] Example 2: A cement clinker decomposition furnace with a daily output of 5000 tons

[0038] (1) Set the main fuel as pulverized coal and the secondary fuel as RDF;

[0039] (2) The height position of the injection point of the main fuel high-quality pulverized coal A=2h / 3;

[0040] (3) Two main fuel nozzles 7 are provided. One of the main fuel nozzles 7 is located at point M in section AB, and the MOB angle is 75°; the other main fuel nozzle 7 is located at section BC. At point N in the middle, the angle of NOB is 15°;

[0041] (4) Install the secondary fuel nozzle 8 in the cone part 2 of the spray furnace 1;

[0042] (5) The model predicts that the burning rate of pulverized coal is 93%, and the decomposition rate of calcium carbonate is 95%.

[0043] (6) When only the main fuel is injected, the main fuel coal is injected from the top of the swirl pre-combustion chamber 3 and the main fuel coal is injected from the side. The comparison of each index is shown in Table 2.

[0044] ...

Example Embodiment

[0046] Example 3: Cement clinker decomposition furnace with a daily output of 10,000 tons

[0047] (1) Set the main fuel as pulverized coal and the secondary fuel as petroleum coke.

[0048] (2) The height position of the pulverized coal injection point A=2H / 3;

[0049] (3) Two main fuel nozzles 7 are provided, of which the plane position of one main fuel nozzle 7 is located at point A in section AB; the plane position of the other main fuel nozzle 7 is located at point C in section BC;

[0050] (4) Set the secondary fuel in the column part of the spray furnace 1;

[0051] (5) The model predicts that the burning rate of pulverized coal is 100%, and the decomposition rate of calcium carbonate is 100%.

[0052] (6) When only the main fuel is injected, the comparison of the indicators is shown in Table 3 in the two pulverized coal entry modes from the top of the swirl pre-combustion chamber 3, coal injection and side coal injection.

[0053] Table 3 Comparison of indicators of 10,000 tons of...

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Abstract

The invention discloses a decomposing furnace based on the multi-fuel injection technology. The decomposing furnace comprises a spouting furnace, a pre-swirl combustion chamber which is positioned below the spouting furnace and communicated with the spouting furnace, and a lower cone body which is positioned between the pre-swirl combustion chamber and communicated with the pre-swirl combustion chamber; a third air inlet and a main fuel injection pipe communicated with a cavity are arranged on the pre-swirl combustion chamber; an inlet of the main fuel injection pipe is formed in the sidewall of the pre-swirl combustion chamber; a secondary fuel injection pipe is positioned on the top part of the pre-swirl combustion chamber or positioned at the cone part of the spouting furnace or positioned on a column body of the spouting furnace; the distance from the main fuel injection pipe to the top end surface of the pre-swirl combustion chamber is A; the length of the short vertical side of the third air inlet is h; the length of the long vertical side of the third air inlet is H; A, h and H meet the relationship below: A is not less than h/4 and not greater than 3H/4. The decomposing furnace is high in fuel adaptability; a plurality of fuel of different types can be injected to gain high combustion burnout rate and meal calcining rate.

Description

technical field [0001] The invention relates to the technical field of calciners in the cement industry, in particular to a calciner based on multi-fuel injection technology. Background technique [0002] The calciner is the core equipment in the new dry process cement production technology. It mainly undertakes the important tasks of combustion and heat release of fuel (mainly pulverized coal) and endothermic decomposition of raw meal. Therefore, the calciner is an energy-consuming equipment. With the continuous increase of cement production and the depletion of coal resources, how to use advanced technology to save energy and reduce consumption as much as possible while ensuring product quality has become an important issue that cannot be ignored. [0003] With the introduction of different quality pulverized coal co-combustion technology and refuse-derived fuel (RDF) combustion technology, injecting multiple fuels into the calciner has become a new way to solve the proble...

Claims

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Application Information

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IPC IPC(8): C04B7/43
CPCY02P40/121
Inventor 梅书霞谢峻林何峰金明芳陈晓琳
Owner WUHAN UNIV OF TECH
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