CN110425520A - A kind of flameless combustion systems for the fire retardant fuel of semicoke class - Google Patents

A kind of flameless combustion systems for the fire retardant fuel of semicoke class Download PDF

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Publication number
CN110425520A
CN110425520A CN201910667707.0A CN201910667707A CN110425520A CN 110425520 A CN110425520 A CN 110425520A CN 201910667707 A CN201910667707 A CN 201910667707A CN 110425520 A CN110425520 A CN 110425520A
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CN
China
Prior art keywords
jet pipe
combustion chamber
air jet
fuel
flue gas
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CN201910667707.0A
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CN110425520B (en
Inventor
王飞飞
李鹏飞
胡帆
杨晨
米建春
柳朝晖
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Peking University
Huazhong University of Science and Technology
ENN Science and Technology Development Co Ltd
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Peking University
Huazhong University of Science and Technology
ENN Science and Technology Development Co Ltd
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F23C9/06—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for completing combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel 
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/30—Technologies for a more efficient combustion or heat usage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

The invention belongs to coal-char combustion fields, and specifically disclose a kind of flameless combustion systems for the fire retardant fuel of semicoke class, the system includes combustion chamber, burner, to powder device and flue gas processing device, wherein combustion chamber is partitioned into inner combustion chamber and outer ring combustion chamber, the lower end of inner combustion chamber is provided with burner, the upper end of partition is provided with tangential flow guiding outlet, and the outer wall of outer ring combustion chamber is provided with water cooling tube and exhanst gas outlet, and bottom end is provided with returning charge bucket；Burner includes the First air jet pipe of coaxial arrangement, has flame Secondary Air jet pipe, nonflame Secondary Air jet pipe and returning charge jet pipe, while further including the ignition module for protruding into inner combustion chamber；It is connect to powder device with First air jet pipe, for providing fuel for it；Flue gas processing device includes sequentially connected afterheat heat exchanger and deduster.The present invention separates combustion process and flue gas utilization process, hot environment needed for can either guaranteeing inner combustion chamber's progress flameless combustion, and can be realized the effective use of flue gas heat.

Description

A kind of flameless combustion systems for the fire retardant fuel of semicoke class
Technical field
The invention belongs to coal-char combustion fields, more particularly, to a kind of flameless combustion for the fire retardant fuel of semicoke class System.
Background technique
Semicoke is the byproduct that coal hydrogenation gasification obtains, it is a kind of volatile matter content extremely low (generally < 5%), fixed carbon The higher fuel of content.Semicoke has the characteristics that ignition temperature is high, reaction rate is slow, the tail-off time is long, existing burning process compared with Hardly possible realizes that the high efficiency of this class A fuel A utilizes.Therefore, the special technology and the device that are suitable for this class A fuel A need to be researched and developed to realize half Burnt large-scale application.
For ultralow volatile fuel, CN103982894B proposes a kind of combustion of fire retardant fine grained fuel of gasification char class Device and the method using device burning are burnt, it is expected that solving the problems, such as that semicoke efficiency of combustion in recirculating fluidized bed is low, this is specially Benefit proposes that semicoke granular fuel enters the burning of burner hearth emulsion zone by devices such as raw material cabin, air injection device, returning charge inclined tubes, still In combustion, semicoke particle is not preheated is sent directly into burner hearth, and it is still lower and easily flame-out to will cause its burn-off rate. CN106556007A proposes a kind of using the separation of deep or light thickness depth and Controllable-vortex stable combustion technology burning coal gasification semicoke particle Method, the First air that patent proposition will carry gasification char powder carry out air-coal separating, obtain concentrated phase and dilute phase semi-coke powder, respectively It is sent into internal layer, middle layer, the outer layer spout of combustion chamber, but because of the method using physical separation, the abrasion of combustion chamber jet pipe may be compared with Seriously, economy is not strong.Meanwhile though above-mentioned burner or method can promote the utilization efficiency of fuel to a certain extent, But the constraint of traditional combustion is not got rid of yet, there are high temperature combustion zone in furnace, discharged nitrous oxides will be higher.
Flameless combustion is a kind of occurs in moderate or the oxidant atmosphere positive displacement combustion state of extreme dilution.It is fired with tradition Burning mode is compared, and the conversion zone of the technology increases, temperature is uniform, visible flame sharp side is not present；In industrial application, heat Efficiency can improve about 30%, and NOx discharge then can be reduced nearly 70%.The ignitability of half coke fuel can be improved using flameless combustion Can, increase its residence time in furnace, to improve its utilization efficiency, but how to improve the combustion of semicoke class in flameless combustion The utilization efficiency of material is still research hotspot.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of for the fire retardant fuel of semicoke class Flameless combustion systems wherein combustion chamber is divided into inner combustion chamber and outer ring combustion chamber using partition, and are set in the upper end of partition Tangential flow guiding outlet is set, combustion process and heat transfer process can be separated, realize flameless combustion, while by outer ring combustion chamber Returning charge bucket is arranged in lower end, can be improved the utilization efficiency of fuel, is therefore particularly suitable for the utilization occasion of the fire retardant fuel of semicoke class.
To achieve the above object, the invention proposes a kind of flameless combustion systems for the fire retardant fuel of semicoke class, including Powder device and flue gas processing device, are given at burner in combustion chamber, in which:
The combustion chamber is divided into inner combustion chamber and outer ring combustion chamber by the partition of annular spread, under the inner combustion chamber End is provided with burner, the inner combustion chamber is sprayed into for mixing fuel and oxidant, to realize flaming combustion or nonflame Burning, the upper end of the partition are provided with tangential flow guiding outlet, and the flue gas for the generation that will burn is in a manner of eddy flow from described Inner combustion chamber is sent into the outer ring combustion chamber, and the outer wall of the outer ring combustion chamber is provided with water cooling tube and exhanst gas outlet, uses respectively In the heat for absorbing the flue gas and the flue gas is discharged, furthermore the bottom end of the outer ring combustion chamber is provided with returning charge bucket, is used for Collect the unburned particulate matter in the flue gas；
The burner includes the First air jet pipe of coaxial arrangement, has flame Secondary Air jet pipe, nonflame Secondary Air jet pipe and return Expect jet pipe, while further including the ignition module for protruding into the inner combustion chamber, the First air jet pipe is located in the burner The heart, it is described to there is flame Secondary Air jet pipe to be set in described one for spraying the oxidant for carrying fuel to the inner combustion chamber The outside of secondary wind jet pipe, for spraying the oxidant in flaming phase, the nonflame Secondary Air jet pipe is arranged described There is the outside of flame Secondary Air jet pipe, for spraying the oxidant in the flameless combustion stage, the returning charge jet pipe is arranged described The outside of nonflame Secondary Air jet pipe, and its entrance is connect with the returning charge bucket, described in the unburned particulate matter is sprayed into It is burnt again inner combustion chamber；
It is described to be connect to powder device with the First air jet pipe, for providing fuel for it；
The flue gas processing device includes sequentially connected afterheat heat exchanger and deduster, the entrance of the afterheat heat exchanger It is connect with the exhanst gas outlet, when work, the flue gas preheated the oxidant in the afterheat heat exchanger, then It is discharged after deduster processing.
As it is further preferred that the ratio between the height and the height of the inner combustion chamber of tangential flow guiding outlet are preferably 1:8~1:5.
As it is further preferred that the ratio between the First air jet pipe and the air output for having flame Secondary Air jet pipe preferably 1:6 The ratio between air output of~1:3, the First air jet pipe and nonflame Secondary Air jet pipe preferably 1:6~1:3.
As it is further preferred that the distance between the First air jet pipe and nonflame Secondary Air jet pipe are the interior burning 0.1 times of room hydraulic diameter~0.7 times.
As it is further preferred that the air outlet velocity of the nonflame Secondary Air jet pipe is 40m/s~100m/s.
As it is further preferred that the nonflame Secondary Air jet pipe is the vertical DC jet tube or an annulus of preset quantity Shape jet pipe.
As it is further preferred that the returning charge jet pipe is that the vertical DC jet tube of preset quantity or a circular ring shape spray Pipe.
As it is further preferred that the outlet for having flame Secondary Air jet pipe is provided with stabilizer.
As it is further preferred that the stabilizer is using spiral-flow type stabilizer, slotted blunt stabilizer or does not crack blunt Body stabilizer.
As it is further preferred that the fuel is half coke fuel or low volatile pulverized coal, the oxidant is air, oxygen The mixture or air of gas and inert gas and the mixture of inert gas.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, mainly have below Technological merit:
1. combustion chamber is divided into inner combustion chamber and outer ring combustion chamber using the lower partition of thermal coefficient by the present invention, and Water-cooling wall is arranged in the outer wall of outer ring combustion chamber, is separated combustion process and flue gas utilization process with this, can either guarantee interior Hot environment needed for combustion chamber carries out flameless combustion, and can be realized the effective use of flue gas heat, thus reducing NOx row The heating efficiency of system, the especially present invention are improved while putting to export by the way that tangential flow guiding is arranged in partition upper end, are made It obtains flue gas and enters outer ring combustion chamber in a manner of eddy flow, and then can sufficiently carry out contact heat-exchanging with water-cooling wall, while generating Centrifugal force and gravity make the unburned particulate matter in flue gas fall to returning charge bucket, and are again introduced into internal combustion by returning charge jet pipe Burn room and carry out circulating combustion and to increase residence time of the fuel in furnace improve the utilization rate of fuel, be suitable for semicoke class or The flameless combustion of the fire retardant fuel such as low volatile pulverized coal；
2. simultaneously, the present invention can guarantee flue gas in outer ring by optimizing to each parameter in flameless combustion systems Effective reflux space is formed in combustion chamber and flow resistance is moderate, while guaranteeing fuel full combustion in inner combustion chamber, The safety and stability of raising system.
Detailed description of the invention
Fig. 1 is the structure according to the flameless combustion systems for the fire retardant fuel of semicoke class of preferred embodiment of the present invention building Schematic diagram；
Fig. 2 is the cross-sectional view in the face A-A in Fig. 1；
Fig. 3 is the cross-sectional view in the face B-B in Fig. 1；
Fig. 4 is the cross-sectional view in the face C-C in Fig. 2；
Fig. 5 is the structural schematic diagram according to the tangential flow guiding outlet of preferred embodiment of the present invention building；
Fig. 6 is the structural schematic diagram according to the burner of preferred embodiment of the present invention building；
Fig. 7 is the cross-sectional view in the face D-D in Fig. 6, wherein the quantity that (a) is nonflame Secondary Air jet pipe and returning charge jet pipe is 1 Distribution schematic diagram, (b) be nonflame Secondary Air jet pipe and returning charge jet pipe quantity be 2 distribution schematic diagram, (c) be nonflame two The distribution schematic diagram that the quantity of secondary wind jet pipe and returning charge jet pipe is 4, (d) be nonflame Secondary Air jet pipe and returning charge jet pipe is annulus The schematic diagram of shape jet pipe.
Fig. 8 is shown provided by the present invention for the internal gas flow glide path of the flameless combustion systems of the fire retardant fuel of semicoke class It is intended to.
In all the appended drawings, identical appended drawing reference is used to denote the same element or structure, in which:
1- oxidant inlet, 2- afterheat heat exchanger, 3- returning charge bucket, 4- give powder device, 5- burner, the inner combustion chamber 6-, 7- Tangential flow guiding outlet, 8- partition, 9- outer ring combustion chamber, 10- exhanst gas outlet, 11- water-cooling wall, 12- deduster, 13- flue gas up to standard, 14- temperature sensor, the unburned particulate matter of 15-, 51- burner head, 52- returning charge jet pipe, 53- nonflame Secondary Air jet pipe, 531- Nonflame Secondary Air jet pipe valve, 54- ignition module, 55- First air jet pipe, 56- have flame Secondary Air jet pipe, and 561- has flame Secondary Air Jet pipe valve, 562- stabilizer.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below Not constituting a conflict with each other can be combined with each other.
As shown in figs. 1 to 6, the embodiment of the present invention proposes a kind of flameless combustion systems for the fire retardant fuel of semicoke class, Including combustion chamber, burner 5, give powder device 4 and flue gas processing device, in which:
Combustion chamber is divided into inner combustion chamber 6 and outer ring combustion chamber 9 by the partition 8 of annular spread, and the lower end of inner combustion chamber 6 is set It is equipped with burner 5, sprays into inner combustion chamber 6 for mixing fuel and oxidant, thus realize flaming combustion or flameless combustion, every The upper end of plate is provided with tangential flow guiding outlet 7, and the flue gas for generating burning is sent into a manner of eddy flow from inner combustion chamber 6 outer Ring combustion chamber 9, the outer wall of outer ring combustion chamber 9 are provided with water cooling tube 11 and exhanst gas outlet 10, are respectively used to absorb the heat of flue gas With discharge flue gas, furthermore the bottom end of outer ring combustion chamber 9 is provided with returning charge bucket 3, for collecting the unburned particulate matter 15 in flue gas；
Burner 5 includes the First air jet pipe 55 for being coaxially fixed on burner head 51, has flame Secondary Air jet pipe 56, nonflame Secondary Air jet pipe 53 and returning charge jet pipe 52, while further including the ignition module 54 for protruding into inner combustion chamber 6, which is electricity Son sparking ignition electrode or open fire ignition module, First air jet pipe 55 are located at the center of burner 5, for spraying to inner combustion chamber 6 The oxidant for carrying fuel, has flame Secondary Air jet pipe 56 to be set in the outside of First air jet pipe 55, in flaming phase Oxidant is sprayed, the outside for having flame Secondary Air jet pipe 56 is arranged in nonflame Secondary Air jet pipe 53, for spraying in the flameless combustion stage Oxidant is penetrated, the outside of nonflame Secondary Air jet pipe 53 is arranged in returning charge jet pipe 52, and its entrance is connect with returning charge bucket 3, is used for Unburned particulate matter 15 penetrating inner combustion chamber 6 is burnt again；
It is connect to powder device 4 with First air jet pipe 55, for providing fuel for it；
Flue gas processing device includes sequentially connected afterheat heat exchanger 2 and deduster 12, the entrance and cigarette of afterheat heat exchanger 2 10 connection of gas outlet, flue gas preheats oxidant in afterheat heat exchanger 2 when work, then after the processing of deduster 12 Flue gas 13 up to standard is discharged into atmosphere.
Further, the ratio between the height of tangential flow guiding outlet and the height of inner combustion chamber 6 preferably 1:8~1:5, the ratio model Enclosing can guarantee that flue gas forms effective reflux space in outer ring combustion chamber 9, while can also avoid the flowing of flue gas Resistance is excessive.
First air jet pipe 55 and have the ratio between air output of flame Secondary Air jet pipe 56 be preferably 1:6~1:3, First air jet pipe 55 With the ratio between the air output of nonflame Secondary Air jet pipe 53 preferably 1:6~1:3, thus guarantee fuel in 6 full combustion of inner combustion chamber, The problem that fuel conveying capacity is insufficient or fuel is flame-out is avoided the occurrence of, is switched in the operating condition for carrying out flaming combustion and flameless combustion When, this ratio can be adjusted according to the actual situation, not need to keep identical.
For guarantee fuel stable flameless combustion is formed in inner combustion chamber 6, avoid because fuel sufficiently reacts too early can not Flameless combustion is formed, while combustion zone also being avoided to cause its damage, First air jet pipe 55 and nonflame Secondary Air jet pipe close to partition 8 The distance between 53 be 0.1 times~0.7 times of 6 hydraulic diameter of inner combustion chamber.
The outlet gross area of nonflame Secondary Air jet pipe 53 should be adjusted according to the actual situation, and guarantee that its air outlet velocity reaches To 40m/s~100m/s, inhaled to form effective large scale flue gas volume in inner combustion chamber 6, and then realize flameless combustion, simultaneously Air delivery pipe resistance can also be avoided excessive.
Further, nonflame Secondary Air jet pipe 53 and returning charge jet pipe 52 be respectively preset quantity vertical DC jet tube or one Circular ring shape jet pipe, as shown in fig. 7, (a) is nonflame Secondary Air jet pipe 53 and point when returning charge jet pipe 52 is 1 vertical DC jet tube Cloth schematic diagram, distribution schematic diagram when (b) be nonflame Secondary Air jet pipe 53 and returning charge jet pipe 52 is 2 vertical DC jet tubes, (c) Distribution schematic diagram when for nonflame Secondary Air jet pipe 53 and returning charge jet pipe 52 being 4 vertical DC jet tubes (d) is nonflame Secondary Air Jet pipe 53 and returning charge jet pipe 52 are the schematic diagram of a circular ring shape jet pipe.
Further, the outlet of flame Secondary Air jet pipe 56 is provided with stabilizer 562, for stablizing fire in flaming phase Flame, the stabilizer 562 is using spiral-flow type stabilizer, slotted blunt stabilizer or not slotted blunt stabilizer.
Further, fuel is half coke fuel or low volatile pulverized coal, and flameless combustion systems provided by the invention pass through increase Residence time of the fuel in burner hearth can guarantee that the fuel combustion of fire retardant class is more abundant, improve the utilization rate of fuel, oxidation Agent is the mixture of air, the mixture of oxygen and inert gas or air and inert gas.
The course of work work of the flameless combustion systems provided by the present invention for the fire retardant fuel of semicoke class is specifically retouched below It states.
(a) warm-up phase, closes the water circulation in water-cooling wall 11, and opening has flame Secondary Air jet pipe valve 561 and closes nothing Flame Secondary Air jet pipe valve 531 makes Secondary Air enter inner combustion chamber 6 by stabilizer 562, with the First air for carrying half coke fuel It meets in inner combustion chamber 6, and forms stable flame under the igniting of ignition module 54, fired to be preheated by flaming combustion Room is burnt, power of inner combustion chamber 6 gradually increases during this, and the flue gas in outer ring combustion chamber 9 passes sequentially through 2 He of afterheat heat exchanger It is discharged after deduster 12, oxidant enters from oxidant inlet 1, and enters burner 5 after preheating in afterheat heat exchanger 2, not Combustion particulate matter 15 then returns to inner combustion chamber 6 after returning charge bucket 3 and returning charge jet pipe 52 and burns away；
(b) flaming combustion monitors the temperature of inner combustion chamber 6 by temperature sensor 14 to flameless combustion switch step, when After inner combustion chamber 6 is heated to 600 DEG C~800 DEG C, gradually closing has flame Secondary Air jet pipe valve 561, while gradually opening nothing Flame Secondary Air jet pipe valve 531 makes inner combustion chamber 6 generate large scale volume and inhales, gradually form flameless combustion by high-speed jet, real The switching of existing combustion mode, the internal system air-flow glide path are as shown in Figure 8；
(c) the flameless combustion stage, after stable flameless combustion is realized after inner combustion chamber 6, the water opened in water-cooling wall 11 is followed Ring realizes the separation of combustion process and heat transfer process, and unburned particulate matter 15 can also return to inner combustion chamber 6 through returning charge bucket 3, thus Reach efficient, low pollution emission half coke fuel smouldering state.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include Within protection scope of the present invention.

Claims (10)

1. a kind of flameless combustion systems for the fire retardant fuel of semicoke class, which is characterized in that including combustion chamber, burner (5), give Powder device (4) and flue gas processing device, in which:
The combustion chamber is divided into inner combustion chamber (6) and outer ring combustion chamber (9), the interior burning by the partition (8) of annular spread The lower end of room (6) is provided with burner (5), the inner combustion chamber (6) is sprayed into for mixing fuel and oxidant, to realize Flaming combustion or flameless combustion, the upper end of the partition be provided with tangential flow guiding outlet (7), for will burn generation flue gas with The mode of eddy flow is sent into the outer ring combustion chamber (9), the outer wall setting of the outer ring combustion chamber (9) from the inner combustion chamber (6) There are water cooling tube (11) and exhanst gas outlet (10), be respectively used to absorb the heat of the flue gas and the flue gas is discharged, it is furthermore described The bottom end of outer ring combustion chamber (9) is provided with returning charge bucket (3), for collecting the unburned particulate matter in the flue gas；
The burner (5) includes the First air jet pipe (55) of coaxial arrangement, has flame Secondary Air jet pipe (56), the spray of nonflame Secondary Air (53) and returning charge jet pipe (52) are managed, while further including the ignition module (54) for protruding into the inner combustion chamber (6), the First air spray Pipe (55) is located at the center of the burner (5), for spraying the oxidant for carrying fuel to the inner combustion chamber (6), The outside for thering is flame Secondary Air jet pipe (56) to be set in the First air jet pipe (55), for spraying institute in flaming phase Oxidant is stated, nonflame Secondary Air jet pipe (53) setting is in the outside for having flame Secondary Air jet pipe (56), in nonflame Combustion phases sprays the oxidant, and the returning charge jet pipe (52) is arranged in the outside of the nonflame Secondary Air jet pipe (53), and And its entrance is connect with the returning charge bucket (3), is fired again for the unburned particulate matter to be sprayed into the inner combustion chamber (6) It burns；
It is described to be connect to powder device (4) with the First air jet pipe (55), for providing fuel for it；
The flue gas processing device includes sequentially connected afterheat heat exchanger (2) and deduster (12), the afterheat heat exchanger (2) Entrance connect with the exhanst gas outlet (10), when work, the flue gas was in the afterheat heat exchanger (2) to the oxidant It is preheated, is then discharged after the deduster (12) processing.
2. being used for the flameless combustion systems of the fire retardant fuel of semicoke class as described in claim 1, which is characterized in that described tangentially to lead The ratio between the height of outflux and the height of the inner combustion chamber (6) preferably 1:8~1:5.
3. being used for the flameless combustion systems of the fire retardant fuel of semicoke class as claimed in claim 1 or 2, which is characterized in that described one Secondary wind jet pipe (55) and have the ratio between air output of flame Secondary Air jet pipe (56) be preferably 1:6~1:3, the First air jet pipe (55) With the ratio between the air output of nonflame Secondary Air jet pipe (53) preferably 1:6~1:3.
4. the flameless combustion systems as claimed in any one of claims 1 to 3 for the fire retardant fuel of semicoke class, which is characterized in that The distance between the First air jet pipe (55) and nonflame Secondary Air jet pipe (53) are the inner combustion chamber (6) hydraulic diameter 0.1 times~0.7 times.
5. being used for the flameless combustion systems of the fire retardant fuel of semicoke class as described in claim 1, which is characterized in that the nonflame two The air outlet velocity of secondary wind jet pipe (53) is 40m/s~100m/s.
6. being used for the flameless combustion systems of the fire retardant fuel of semicoke class as described in claim 1, which is characterized in that the nonflame two Secondary wind jet pipe (53) is the vertical DC jet tube or a circular ring shape jet pipe of preset quantity.
7. being used for the flameless combustion systems of the fire retardant fuel of semicoke class as described in claim 1, which is characterized in that the returning charge spray Manage the vertical DC jet tube or a circular ring shape jet pipe that (52) are preset quantity.
8. being used for the flameless combustion systems of the fire retardant fuel of semicoke class as described in claim 1, which is characterized in that described to have flame two The outlet of secondary wind jet pipe (56) is provided with stabilizer (562).
9. being used for the flameless combustion systems of the fire retardant fuel of semicoke class as claimed in claim 8, which is characterized in that the stabilizer (562) using spiral-flow type stabilizer, slotted blunt stabilizer or not slotted blunt stabilizer.
10. the flameless combustion systems as described in any one of claims 1 to 9 for the fire retardant fuel of semicoke class, which is characterized in that The fuel is half coke fuel or low volatile pulverized coal, and the oxidant is the mixture or sky of air, oxygen and inert gas The mixture of gas and inert gas.
CN201910667707.0A 2019-07-23 2019-07-23 Flameless combustion system for semi-coke type flame-retardant fuel Active CN110425520B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112013543A (en) * 2020-08-11 2020-12-01 华中科技大学 Flameless combustion and heat recovery device and application
CN113092659A (en) * 2021-03-30 2021-07-09 中国人民解放军国防科技大学 High-temperature and high-pressure environment metal powder ignition combustion test device capable of working stably
CN113862039A (en) * 2020-06-30 2021-12-31 中国科学院工程热物理研究所 Gasification nozzle

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