CN100368286C

CN100368286C - Method and device of rotary calcining petrol coke

Info

Publication number: CN100368286C
Application number: CNB2005100316109A
Authority: CN
Inventors: 周乃君; 周萍; 刘朝东
Original assignee: Central South University
Current assignee: Central South University
Priority date: 2005-05-26
Filing date: 2005-05-26
Publication date: 2008-02-13
Anticipated expiration: 2025-05-26
Also published as: CN1868866A

Abstract

The present invention relates to a method and a device for the revolving calcination of petroleum coke, which is composed of a kiln head, a kiln body, a material feeding pipe, a coal gas spraying opening, a feeding opening, an outlet end, an ash depositing chamber, etc. The side wall of the ash depositing chamber on the kiln end is provided with a hole, and a flue or a smoke pipe with good heat preservation is used for communicating the high-temperature smoke gas of the kiln end with a primary air pipe of the kiln head. A smoke gas filtering net, an adjusting valve board, a bypassing cold-air adjusting pipe and a high-temperature blower are arranged in the flue or the smoke pipe. The blowing directions of a secondary tuyere and a thrice tuyere direct the kiln end. The amount of the returning smoke passing thorough the flue or the smoke pipe is from 30% to 50% of the total amount of the kiln end smoke. The negative pressure of the kiln head is from-20 to 5Pa, and the negative pressure of the kiln end is from-30 to 20Pa. The device and the method can greatly reduce the carbon burning loss in the kiln, increase the actual extracting yield and the productivity of the calcining kiln, and reduce the product energy consumption and production cost.

Description

A kind of method and apparatus of rotary calcining petrol coke

Technical field the present invention relates to a kind of petroleum coke calcination method and device, particularly a kind of back-smoke type low-oxygen dynamic combustion refinery coke calcined by rotary kiln technology and device.

The background technology refinery coke is the main raw material that used for aluminium electrolysis anode and negative electrode are produced, and the calcining of refinery coke is one of master operation of carbon material production.The calcining of refinery coke at present mainly contains pot furnace, rotary kiln and horizontally rotates three kinds of technologies of bed calcinator, rotary kiln technology is produced continuously because of having, production capacity is big, production cost is relatively low, the operation regulation and control are more or less freely, and plain manufacturing enterprise has obtained widespread use at the bigger charcoal of industrial scale.Compare with pot furnace, its main drawback is that the refinery coke scaling loss is serious, and at present more than 12%, the 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 the bed calcinator floor space, burning quality is even, the carbonaceous loss is lower than rotary kiln, but the device structure more complicated, investment is big, thereby adopts the factory of this calciner less.

The low-oxygen dynamic combustion technology is a kind of novel combustion technology, its main thought is the combustion air that adopts the high-temperature flue gas preheated burning after burning to use, it is reached more than 800 ℃, like this can be at lower excess air coefficient, be under the low oxygen concentration, the interior flame that forms of the bigger spatial dimension in stove inherence fully burnt, and keep higher medial temperature level, therefore be called low-oxygen dynamic combustion, thereby can improve efficiency of combustion, minimizing disposal of pollutants, reduction equipment energy consumption.The high major cause of scaling loss is that the air quantity that infeeds is many in the calcining petroleum coke kiln, makes oxygen concentration height in the kiln, thereby has quickened the oxidization burning loss of refinery coke.Under present processing condition, reduce infeeding air quantity, self-heating in the kiln (mainly by the volatile matter of refinery coke with by the burning of scaling loss thing) is not enough, calcining temperature does not increase, and can have influence on the production capacity of burning quality and kiln, supplies fuel more, from and cause the increase of fuel consumption, also lose more than gain.

Summary of the invention does not increase the consumption of fuel again in order to guarantee overall work temperature in the kiln, the invention provides a kind of back-smoke type rotary calcining petrol coke method and apparatus.

The device that the present invention adopts will have rotary calcining petrol coke high-temperature flue gas that kiln is discharged now and partly return in the kiln, realize low-oxygen dynamic combustion, so both help keeping high temperature in the kiln, help reducing oxygen concentration in the kiln again, thereby reduce the burn out rate of refinery coke.The present invention provides and is fit to the required processing parameter condition of refinery coke calcined by rotary kiln novel method, can improve the rotary kiln unit output, reduces energy consumption of unit product.

The refinery coke calcined by rotary kiln novel method that the present invention proposes comprises following technical essential:

Employing perforate on the side wall of the heavy grey chamber of original rotary calcining petrol coke kiln kiln tail, by connecting good flue or the smoke pipe and the high-temperature blower of insulation of suitable dimension, and be provided with the smoke filtration net and regulate valve plate and bypass cold wind adjustable pipe, part in the high-temperature flue gas of about 1000 ℃ of existing rotary calcining petrol coke kiln kiln tail discharges is transported to kiln hood, utilize the original airduct of kiln hood to return in the kiln then, realize low-oxygen dynamic combustion.

Original burner on the rotary calcining petrol coke kiln and secondary air, tertiary air plenum system, waste heat boiler and fume exhaust system all keep, but the blowing direction of secondary air, tertiary air all changes sensing kiln tail into.

Return the cigarette amount and account for 30～50% of kiln exit gas total amount, can adjust according to the production capacity of temperature in the stove and kiln, the wind rate of secondary air, tertiary air designs according to the production capacity of refinery coke Material Characteristics and kiln.Kiln hood, kiln tail negative pressure are carried out strict control, the kiln hood negative pressure is controlled at-20～-5Pa, kiln tail negative pressure is controlled at-30～-20Pa near.

The rotary calcining petrol coke method that the present invention proposes, transformation amount to existing rotary calcining petrol coke kiln system is less, return the cigarette device by increase, the total oxygen demand of supplying with in the kiln is reduced, utilized the waste heat of kiln tail high-temperature flue gas simultaneously, make the interior most of zone of kiln be in low-oxygen dynamic combustion, improve the medial temperature of calcination area, thereby can reduce the carbonaceous scaling loss in the kiln significantly, improved casting yield, also help the production capacity that improves calcining kiln simultaneously, reduce product energy consumption and production cost.

Description of drawings

Fig. 1 is a system architecture synoptic diagram of the present invention.

Following structure accompanying drawing is done detailed explanation to the specific embodiment of the present invention.

Embodiment is that example is illustrated with the rotary calcining petrol coke kiln of Φ 2.2 * 45m specification commonly used at present.The present unit-hour output of this type of calcining kiln is 5.5t/h, and the carbonaceous burn out rate is about 12～15% during calcining, and casting yield is about about 72%; Primary air ratio (containing the kiln hood inleakage) is about 9000Nm ³/ h, two, the tertiary air rate is about 1600Nm respectively ³/ h and 2000Nm ³/ h, the kiln exit gas temperature is about 1020 ℃, and exhaust smoke level is about 15000Nm ³/ h, combustible content is roughly between 3%～4% in the flue gas, and kiln tail negative pressure is near-30Pa.

When adopting the present invention that existing rotary calcining petrol coke system implementation is transformed, kiln body 4, tremie pipe 5, gas port 6, feed opening 7 and a wind, secondary air, the tertiary air plenum system, waste heat boiler and fume exhaust system etc. all remain unchanged, only need perforate on 12 side walls of the heavy grey chamber of original rotary calcining petrol coke kiln kiln tail, the position in hole is on the top of kiln tail exit end 13, by diameter phi is good flue or smoke pipe 8 and the high-temperature blower 14 of insulation of 7001000mm, the part that existing rotary calcining petrol coke kiln kiln tail is discharged 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, utilize the original airduct 2 of kiln hood to return in the kiln again, and to overfire air fan 3, the wind rate of tertiary air machine 9 is adjusted, all change its blowing direction into sensing kiln tail, the total oxygen demand of supplying with in the kiln is reduced, also utilized simultaneously the waste heat (chemical heat that comprises physics heat and the volatile matter that does not burn) of kiln tail high-temperature flue gas, to make the interior most of zone of kiln be in low-oxygen dynamic combustion, calcination area medial temperature level is improved, kiln flow field and temperature field tissue will be optimized, thereby can reduce the carbonaceous scaling loss in the kiln significantly, improve casting yield, simultaneously because the calcining segment length prolongs to some extent, this all helps improving the production capacity of calcining kiln, reduces product energy consumption and production cost.

Transform back main technologic parameters scope: to return the cigarette amount and account for 30～50% of kiln exit gas total amount, can adjust according to the production capacity of temperature in the stove and kiln, the kiln hood negative pressure is controlled at-20～-5Pa; The carbonaceous burn out rate can be controlled in below 5%, and casting yield can reach more than 80%, and this binomial index and pot furnace technology remain basically stable, but production capacity is more much bigger than pot furnace during platform.

Claims

1. rotary calcining petrol coke method, it is characterized in that: a part of calcining kiln being discharged high-temperature flue gas is returned in the kiln, with insulation good flue or smoke pipe, the high-temperature flue gas of kiln tail and an airduct of kiln hood are communicated with, and the blowing direction of overfiren air port, tertiary air orifice pointed to the kiln tail, and the cigarette amount of returning by flue or smoke pipe is 30～50% of a kiln exit gas total amount, the negative pressure of kiln hood is-20～-5Pa, kiln tail negative pressure-30～-20Pa, realize low-oxygen dynamic combustion.

2. rotary calcining petrol coke device of implementing the described method of claim 1, comprise kiln hood, primary air nozzle, overfiren air port, tertiary air orifice, kiln body, tremie pipe, gas port, feed opening, exit end and heavy grey chamber, it is characterized in that: perforate on the side wall of the heavy grey chamber of kiln tail, with flue or smoke pipe the high-temperature flue gas of kiln tail and the primary air nozzle of kiln hood are communicated with, are provided with the smoke filtration net in flue or the smoke pipe, regulate valve plate, bypass cold wind adjustable pipe and high-temperature blower.

3. rotary calcining petrol coke device according to claim 2 is characterized in that: the perforate on the side wall of the heavy grey chamber of kiln tail is positioned at the top of exit end, and the size in aperture is φ 700～1000mm.