CN105314616A

CN105314616A - Petroleum coke rotating calcination method

Info

Publication number: CN105314616A
Application number: CN201410361969.1A
Authority: CN
Inventors: 陈彬; 曲维龙
Original assignee: Shaanxi Shenghuiyuan Information Technology Co Ltd
Current assignee: Shaanxi Shenghuiyuan Information Technology Co Ltd
Priority date: 2014-07-28
Filing date: 2014-07-28
Publication date: 2016-02-10

Abstract

The present invention discloses a petroleum coke rotating calcination method, which is characterized in that one part of high temperature flue gas discharged from a calcination kiln returns to the kiln to achieve low-oxygen diffusion combustion, the high temperature flue gas of the kiln tail and the primary wind pipe of the kiln head are communicated by using a flue channel or flue pipe having good thermal insulation, the blowing directions of the secondary wind port and the tertiary wind port are directed to the kiln tail, the amount of the returning flue passing through the flue channel or flue pipe is 30-50% of the total amount of the kiln tail flue gas, the kiln head negative pressure is -20 to -5 Pa, and the kiln tail negative pressure is -30 to -20 Pa. According to the present invention, the petroleum coke rotating calcination method is provided, and the existing petroleum coke rotating calcination kiln system transformation amount is less; the flue returning device is increased, such that the total amount of the oxygen supplied by the kiln is reduced the kiln tail high temperature flue gas waste heat is utilized, such that the most region inside the kiln is in the low-oxygen diffusion combustion state, and the average temperature of the calcination region is increased so as to substantially reduce the carbon combustion loss in the kiln, improve the yield, improve the calcination kiln productivity, and reduce the product energy consumption and the production cost.

Description

A kind of rotary calcining petrol coke method

Technical field

The present invention relates to a kind of rotary calcining petrol coke method.

Background technology

Refinery coke is the main raw material that anodes used in aluminum electrolysis and negative electrode are produced, and the calcining of refinery coke is one of master operation of carbon material production.The calcining of current refinery coke mainly contains pot furnace, rotary kiln and horizontally rotates bed calcinator three kinds of techniques, rotary kiln technology is produced continuously because having, production capacity is large, production cost is relatively low, operation regulation and control are comparatively easy, and the Tan Su manufacturing enterprise larger in industrial scale is widely applied.Compared with pot furnace, its main drawback is that refinery coke scaling loss is serious, and at present more than 12%, calcining casting yield is low, about about 72%, be unfavorable for the reduction of male or female production cost, and it is less to horizontally rotate bed calcinator floor space, burning quality is even, carbonaceous loss is lower than rotary kiln, but device structure more complicated, investment is large, and thus Bian is less with the factory of this calciner.

Low-oxygen dynamic combustion technology is a kind of New combustion technique, its main thought is the combustion air of the high-temperature flue gas preheated burning after adopting burning, it is made to reach more than 800 DEG C, like this can at lower excess air coefficient, namely, under low oxygen concentration, make the spatial dimension interior formation flame Thorough combustion that stove is inherent larger, and maintain higher average temperature level, therefore be called low-oxygen dynamic combustion, thus efficiency of combustion, decreasing pollution discharge, reduction equipment energy consumption can be improved.The major cause that in calcining petroleum coke kiln, scaling loss is high is that the air quantity fed is many, makes oxygen concentration in kiln high, thus accelerates the oxidization burning loss of refinery coke.Under current technique Pie, reduce and feed air quantity, in kiln, self-heating (the main volatile matter by refinery coke and the burning being burnt thing) not, calcining temperature does not increase, and can have influence on the production capacity of burning quality and kiln, supply fuel more, from and cause the increase of fuel consumption, also lose more than gain.

Summary of the invention

For solving above-mentioned existing shortcoming, main purpose of the present invention is a kind of rotary calcining petrol coke method providing practicality, namely ensure that overall work temperature in kiln, does not increase again the consumption of fuel.

For reaching above-mentioned purpose, a kind of rotary calcining petrol coke method of the present invention takes following technical scheme:

A kind of rotary calcining petrol coke method, it is characterized in that, a part of calcining kiln being discharged high-temperature flue gas returns in kiln, realize low-oxygen dynamic combustion, with the good flue of insulation or smoke pipe, the high-temperature flue gas of kiln tail is communicated with the primary air piping of kiln hood, and the blowing direction of overfiren air port, tertiary air orifice is pointed to kiln tail, by flue or smoke pipe to return smoke which be the negative pressure of 30 50% kiln hoods of kiln exit gas total amount is-20-5Pa, kiln tail negative pressure is at-30-20Pa.

Adopt the present invention of as above technical scheme, there is following beneficial effect:

The rotary calcining petrol coke method that the present invention proposes, less to the transformation amount of existing refinery coke revolution calcination kiln system, returning cigarette device by increasing, the total oxygen demand of supply in kiln being reduced, make use of the waste heat of kiln tail high-temperature flue gas simultaneously, most of region in kiln is made to be in low-oxygen dynamic combustion, improve the medial temperature of calcination area, thus significantly can reduce the carbonaceous scaling loss in kiln, improve casting yield, also help the production capacity improving calcining kiln simultaneously, reduce product energy consumption and production cost.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention.

Embodiment

In order to further illustrate the present invention, be described further below in conjunction with accompanying drawing:

A kind of rotary calcining petrol coke method of the present invention, a part of calcining kiln being discharged high-temperature flue gas returns in kiln, realize low-oxygen dynamic combustion, with the good flue of insulation or smoke pipe, the high-temperature flue gas of kiln tail is communicated with the primary air piping of kiln hood, and the blowing direction of overfiren air port, tertiary air orifice is pointed to kiln tail, by flue or smoke pipe to return smoke which be the negative pressure of 30 50% kiln hoods of kiln exit gas total amount is-20-5Pa, kiln tail negative pressure is at-30-20Pa.The rotary calcining petrol coke kiln of conventional Φ 2.2 × 45m specification is that example is explained.The current unit-hour output of this type of calcining kiln is 5.5t/h, and during calcining, carbonaceous burn out rate is about 12 15%, and casting yield is about about 72%; Primary air ratio (containing kiln hood inleakage) is about 9000Nm ³/ h, two, tertiary air rate is about 1600Nm respectively ³/ h and 2000Nm ³/ h, kiln exit gas temperature is at about 1020 DEG C, and exhaust smoke level is about 15000Nm ³/ h, in flue gas between combustible content roughly 3% 4%, kiln tail negative pressure is near-30Pa.

As shown in Figure 1, when adopting the present invention to existing rotary calcining petrol coke system implementation transformation, kiln body 4, tremie pipe 5, gas port 6, feed opening 7 and First air, secondary air, tertiary air plenum system, waste heat boiler and fume exhaust system etc. all remain unchanged, only need Jian hole on original rotary calcining petrol coke kiln kiln tail sinks grey room 12 side wall, the position in hole is on the top of kiln tail exit end 13, be the good flue of the insulation of 700 1000 ㎜ or smoke pipe 8 and high-temperature blower 14 by diameter of phi, the part that existing rotary calcining petrol coke kiln kiln tail discharges high-temperature flue gas is transported to kiln hood 1, flue or smoke pipe 8 are provided with smoke filtration net 11 and regulate valve plate 10 and bypass cold wind adjustable pipe 15, the original primary air piping 2 of recycling kiln hood returns in kiln, and to overfire air fan 3, the wind rate of tertiary air machine 9 adjusts, its blowing direction is all changed into and points to kiln tail, the total oxygen demand of supply in kiln can be made like this to reduce, also utilize the waste heat (comprise physical thermal and do not fire the chemical heat of volatile matter of torch) of kiln tail high-temperature flue gas simultaneously, most of region in kiln will be made to be in low-oxygen dynamic combustion, calcination area average temperature level be improved, kiln flow field and-field tissue will be optimized, thus the carbonaceous scaling loss that can significantly reduce in kiln, improve casting yield, simultaneously because calcining segment length extends to some extent, this is all conducive to the production capacity improving calcining kiln, reduce product and production cost.

Main technologic parameters scope after transformation: return that smoke which accounts for kiln exit gas total amount 30 50%, can adjust according to the production capacity of in-furnace temperature and kiln, kiln hood vacuum cavitations is at-20-5Pa, carbonaceous burn out rate can be controlled in less than 5%, casting yield can reach more than 80%, this binomial index and pot furnace technique remain basically stable, but during platform, production capacity is more much bigger than pot furnace.

Claims

1. a rotary calcining petrol coke method, it is characterized in that, a part of calcining kiln being discharged high-temperature flue gas returns in kiln, realize low-oxygen dynamic combustion, with the good flue of insulation or smoke pipe, the high-temperature flue gas of kiln tail is communicated with the primary air piping of kiln hood, and the blowing direction of overfiren air port, tertiary air orifice is pointed to kiln tail, by flue or smoke pipe to return smoke which be the negative pressure of 30 50% kiln hoods of kiln exit gas total amount is-20-5Pa, kiln tail negative pressure is at-30-20Pa.