A kind of oxygen-enriched burning device of burning inferior coal
Technical field
The present invention relates to a kind of oxygen-enriched burning device of burning inferior coal, be inferior fuel combustion apparatus field.
Background technology
Mostly the fuel that each big stove of current China, kiln enterprise use is bituminous coal, the brown coal of high-quality.But because of factors such as its skewness, cost of transportation height and rise in price, more producers have turned one's attention in the use of colm.Utilizing the oxygen enrichment principle to solve the coal combustion problem, is present comparatively advanced and mature method.
Propose in high-temp oxygen-enriched air fire lighting method for coal powder boiler that publication number CN1752524A patent documentation proposes and the device, coal dust is divided into three strands: the shallow bid coal dust enters in the igniting chamber, meets to mix with oxygen enrichment in the high-temperature oxygen-enriched chamber and is lighted; And then the more coal dust in the coal dust sleeve pipe lighted, light the most of coal dust that still in the coal airduct, flows at last.Accomplish the classification ignition procedures of little fire point big fire.This device can be saved great amount of fuel oil, and is simple to operate, safe and reliable.But need to increase heater, investment improves; In pipeline, the fraction coal dust is lighted, produced big calorimetric, pipeline material is had relatively high expectations and cannot say for sure to demonstrate,prove in the big calorimetric safety of small space accumulated.
Propose in the coal gas that publication number CN101407381A patent documentation proposes, coal dust, oxygen-enriched mixed combustion method and the device, coal gas, coal dust and oxygen enrichment are sent to respectively to mix in stove, the kiln combustion chamber burn.Device therefor is the rifle shape jet pipe of a multilayer chamber structure.The jet pipe center is axial flow oxygen enrichment air channel, and second circle is a gas passage, and the 3rd circle is the coal dust passage, and the 4th circle is an inner cone eddy flow oxygen enrichment wind passage.Because of gas firing point is low, inflammable, it is mixed can promote the kiln temperature rapidly with coal dust, fast firing coal-dust.But fix between each air channel, flame is regulated underaction.
The oxygen enrichment method and the device of the raising burning clinker of cement temperature that publication number CN101407381A patent documentation proposes are partly to change oil gun into the oxygen enrichment passage; Feed the pure oxygen of concentration more than 90% and enter into wind of combustion chamber neutralization, coal dust mixed combustion, solve the problem that the cement kiln combustion system requires ature of coal with this.This device can be good at burning inferior coal, but the oxygen enrichment passage is too single, can not guarantee to mix fully, evenly with wind, coal dust, and not strong to the adaptability of coal.
Therefore it is very ripe to utilize oxygen enrichment to solve pulverized coal ignition, steady idea of firing at present, but device is still waiting further improvement, and also less to the research that utilizes the oxygen enrichment burning inferior coal.
Summary of the invention
The purpose of this invention is to provide a kind of simple to operation, regulate flexibly the colm oxygen-enriched burning device that the completion time of project is short, strong to coal adaptability.
Technical scheme of the present invention is following:
A kind of oxygen-enriched burning device of burning inferior coal, said oxygen-enriched burning device contain oxygen enrichment nozzle, outer tube, carriage, oxygen enrichment passage, inner sleeve and burner; Said burner, inner sleeve and outer tube are arranged concentric, and burner is arranged on inner sleeve inside; Described oxygen enrichment passage is made up of the heat-resistant tube earthenware inner with being arranged on this heat-resistant tube; And be provided with the oxygen enrichment nozzle at the port of export of oxygen enrichment passage; This oxygen enrichment passage is nested and be fixed in the said carriage, and between inner sleeve and outer tube, slides along central axial direction; Said carriage is by being fixed on slide block on the heat-resistant tube, being fixed on the external chute on the outer tube and the internal chute that is fixed on the inner sleeve constitutes.
In the technique scheme, described burner is a tubular structure; Said oxygen enrichment passage adopts more than two, is the center of circle with the burner center, is evenly arranged between inner sleeve and the outer tube.The injection direction of described oxygen enrichment nozzle is towards burner, and and the central axis of burner between form 15~75 ° angle.The radius R of inner sleeve is 1~1.5 times of combustion component outer tube diameter.
The present invention compares with prior art, has the following advantages and the high-lighting effect: need not change existing combustion component structure, the saving funds shorten the completion time of project; It is between the inside and outside sleeve pipe at center that the oxygen enrichment passage is evenly arranged in the combustion component axis; And the oxygen enrichment nozzle is logical and the combustion component axis between angle be 15-75 °; The oxygen of concentration more than 90% is injected at a relatively high speed in the combustion chamber and carries out sufficient disturbance mixing with wind powder mixture, is beneficial to the fuel after-flame; The oxygen enrichment passage moves through the chute upper edge combustion component axis of the slide block on the steel pipe between inside and outside sleeve pipe, regulates the position that oxygen sprays into, and changes the position, high-temperature region; The oxygen enrichment nozzle is connected with the oxygen enrichment passage through screw thread, is convenient for changing equipment.
Description of drawings
Among the figure: 1-oxygen enrichment nozzle; The 2-outer tube; The 3-external chute; The 4-slide block; The 5-heat-resistant tube; The 6-earthenware; The 7-internal chute; The 8-inner sleeve; The 9-combustion component
Fig. 1 is the sketch map of oxygen-enriched burning device involved in the present invention.
Fig. 2 is the A-A sketch map of oxygen-enriched burning device involved in the present invention.
Fig. 3 looks sketch map for the oxygen enrichment nozzle master of oxygen-enriched burning device involved in the present invention.
Fig. 4 looks sketch map for the chute slide block left side of oxygen-enriched burning device involved in the present invention.
The specific embodiment
Describe concrete structure of the present invention, operation principle and embodiment in detail below in conjunction with accompanying drawing 1:
Fig. 1 is the sketch map of oxygen-enriched burning device involved in the present invention, and said oxygen-enriched burning device contains oxygen enrichment nozzle 1, outer tube 2, carriage, oxygen enrichment passage, inner sleeve 8 and combustion component 9; Described combustion component 9, inner sleeve 8 and outer tube 2 are arranged concentric, and combustion component 9 is arranged on inner sleeve 2 inside, is followed successively by combustion component, inner sleeve and outer tube from the inside to surface.Combustion component 9 can adopt conventional burner, and air and coal dust spray into from this burner.The oxygen enrichment passage is made up of heat-resistant tube 5 earthenware 6 inner with being arranged on this heat-resistant tube; The oxygen enrichment passage is nested and be fixed in the said carriage; And can be between inner sleeve 8 and outer tube 2 slide along central axial direction, be provided with oxygen enrichment nozzle 1 at the port of export of oxygen enrichment passage.Carriage is by being fixed on slide block 4 on the heat-resistant tube, being fixed on the external chute 3 on the outer tube and the internal chute 7 that is fixed on the inner sleeve constitutes.
The present invention is arranged under the hot environment, and for guaranteeing in hot environment the present invention not by the oxygen rich gas oxidation in the oxygen enrichment passage, the material require of oxygen enrichment channel part is high temperature resistant and do not react with oxygen.Therefore, oxygen enrichment passage of the present invention designs for Double layer pipeline, and inner and oxygen contact portion adopts earthenware 6, and is oxidized to prevent that it from contacting with oxygen under hot conditions; The passage skin is a heat-resistant tube 5, is out of shape and carbonization under hot conditions to prevent it.Earthenware 6 is arranged in the heat-resistant tube 5, with heat-resistant tube 6 with the socket of concentric circles sleeve pipe mode, formed the oxygen enrichment passage.
Oxygen enrichment nozzle 1 is arranged on the oxygen enrichment channel outlet, forms 15-75 ° angle between the central axis of oxygen enrichment nozzle and combustion component 9 central axis.Oxygen rich gas sprays with 15~75 ° of angles from the oxygen enrichment nozzle through the oxygen enrichment passage and enters into stove, kiln inner combustion chamber.Oxygen rich gas meets with wind powder (air and the coal dust) mixture that gets into from combustion component 9 spouts; Oxygen rich gas and wind powder mixture are fully mixed in this process; Reached the purpose that increases oxygen-adding amount, formed and to be easy to that colm is lighted, surely the oxygen-enriched environment of combustion, after-flame makes the abundant disturbance of wind powder mixture.Oxygen enrichment nozzle and oxygen enrichment passage are through being threaded, and convenient damage part is changed, and is simple to operation.Slide block 4 is fixed on the heat-resistant tube, constitutes carriage with the external chute 3 that is fixed on the outer tube with the internal chute 7 that is fixed on the inner sleeve.The oxygen enrichment passage is nested and be fixed in this carriage, between inner sleeve 8 and outer tube 2, radially slides and adjusts distance, changes the flame high-temperature region, adapts to the requirement of different coals to burning position.
For reaching the condition of abundant oxygen enrichment, the oxygen enrichment passage can be provided with more than two, is the center of circle with the combustion component central axis, is evenly arranged between inner sleeve 8 and the outer tube 2.The radius R of inner sleeve is 1~1.5 times of combustion component outer tube diameter.
One group of oxygen enrichment nozzle is set on each oxygen enrichment passage, and the oxygen enrichment nozzle adopts with the oxygen enrichment passage and is threaded.Being threaded between oxygen enrichment nozzle and the oxygen enrichment passage can be so that the oxygen enrichment nozzle exchange be simple to operation.