CN217584450U - Micro-oil ignition device for pulverized coal combustion of difficult-to-burn coal - Google Patents
Micro-oil ignition device for pulverized coal combustion of difficult-to-burn coal Download PDFInfo
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- CN217584450U CN217584450U CN202220944907.3U CN202220944907U CN217584450U CN 217584450 U CN217584450 U CN 217584450U CN 202220944907 U CN202220944907 U CN 202220944907U CN 217584450 U CN217584450 U CN 217584450U
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- 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 utility model provides a tiny-oil ignition device for the burning of coal powder of difficult-to-burn coal types. The micro-oil ignition device for coal powder combustion of difficult-to-combust coal comprises: the coal powder concentration combustion chamber is internally provided with a fire-resistant wear-resistant composite sintering layer; the wear-resistant guide elbow is arranged on one side of the pulverized coal concentration combustion chamber and communicated with the pulverized coal concentration combustion chamber; the concentrated blunt body is arranged in the wear-resistant guide elbow; and the micro-oil burner is arranged on the wear-resistant guide elbow. The utility model provides a tiny-oil ignition device for difficult-to-burn coal kind buggy burning has the low-load and surely fires, and the effect of economizing on fuel is showing, and the additional resistance is not big, and then can reform transform that the work load is little and safe and reliable, can be applied to difficult-to-burn coal kind if: the utility boiler of anthracite and lean coal realizes the advantages of starting, stable combustion and saving fuel.
Description
Technical Field
The utility model belongs to the technical field of the tiny-oil ignition of coal type pulverized coal burning, especially, relate to a tiny-oil ignition device for difficult-to-burn coal type pulverized coal burning.
Background
Before the pulverized coal is put into the pulverized coal boiler for normal combustion, the pulverized coal must be preheated to a certain temperature through a hearth of the pulverized coal boiler, otherwise the pulverized coal cannot be ignited in the hearth; in addition, a large amount of unburned coal powder is accumulated in the hearth, coal powder explosion or explosion accidents are easy to happen, and the conventional ignition firing mostly adopts a diesel oil gun, so that on one hand, the diesel oil consumption in the ignition process is large, and huge economic burden is brought to enterprises; on the other hand receives the influence of combustion space and atomization effect, in the correlation technique, a gas ignition device applied to a pulverized coal burner is disclosed, including a gas core tube positioned in an outer sleeve, a spray head, an ignition gun and a combustion chamber, an air channel is formed between the outer sleeve and the gas core tube, the spray head comprises an annular guide plate and a guide cup fixed with the center of the annular guide plate in a sealing manner, the annular guide plate is positioned in the outer sleeve, the guide cup is positioned in the combustion chamber, the opening of the guide cup is connected with the outlet of the gas core tube, the annular guide plate is positioned at one end of the air channel, the extension of the annular guide plate is fixed with the outer sleeve, a plurality of air swirl grooves uniformly distributed circumferentially are formed on the annular guide plate, a mounting hole is formed on the annular guide plate, the ignition gun is fixed on the mounting hole, a plurality of primary gas holes are formed at the bottom of the guide cup, and a plurality of secondary gas holes are formed in the cup body of the guide cup. The technical problem that an existing fuel oil ignition device is high in economic cost is solved, semi-premixed combustion of fuel gas is achieved, flame stability is improved, and flame forms are optimized.
However, the above structure has disadvantages that the ignition of the utility boiler consumes a large amount of fuel each year, and the utility boiler for combustible coal types has been widely used for saving fuel by plasma and the like, but for the use of difficult-to-combust coal types such as: the boiler of the power station of anthracite and lean coal still needs to adopt a large amount of fuel oil to start and stabilize the combustion.
Therefore, there is a need to provide a new tiny-oil ignition device for coal dust combustion of difficult-to-burn coal, which solves the above technical problems.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem provide a have the low-load surely fire, the effect of economizing on fuel is showing, and the additional resistance is not big, and then can reform transform that the work load is little and safe and reliable, can be applied to difficult coal kind if: the micro-oil ignition device for burning the pulverized coal of the difficult-to-burn coal can realize the starting, stable burning and fuel saving of the power station boiler of the anthracite and the lean coal.
In order to solve the technical problem, the utility model provides a tiny-oil ignition device for difficult-to-combust coal kind pulverized coal includes: the coal dust concentrating combustion chamber is internally provided with a fire-resistant wear-resistant composite sintering layer;
the wear-resistant guide elbow is arranged on one side of the pulverized coal concentration combustion chamber and communicated with the pulverized coal concentration combustion chamber;
the concentrating bluff body is arranged in the wear-resistant guide elbow;
the micro-oil burner is arranged on the wear-resistant guide elbow;
the combustion chamber of the oxygen-assisted air is arranged on the pulverized coal concentration combustion chamber, and the combustion chamber of the oxygen-assisted air is communicated with the pulverized coal concentration combustion chamber;
the tapered reducing opening is arranged on the combustion chamber of the oxygen-assisted air and communicated with the pulverized coal concentration combustion chamber;
and the secondary air box is arranged on the pulverized coal concentration combustion chamber.
As a further proposal of the utility model, a fire-resistant and wear-resistant composite layer is arranged in the micro oil burner, a connecting pipe is arranged on the micro oil burner, and the connecting pipe is communicated with the micro oil burner.
As a further proposal of the utility model, be equipped with compressed air pipe on the connecting pipe, be equipped with the diesel oil inlet pipe on the connecting pipe, be equipped with the high pressure tuber pipe of going into on the connecting pipe.
As a further proposal of the utility model, a pulverized coal concentration ring is arranged on the fire-resistant and wear-resistant composite layer, and an image monitoring device is arranged on the micro oil burner.
As a further proposal of the utility model, the pulverized coal fire detector is arranged on the micro-oil burner.
Compared with the prior art, the utility model provides a tiny-oil ignition device for difficult coal pulverized coal burning has following beneficial effect:
1. the utility model discloses after using the device, the tiny-oil ignition can be applied to difficult coal kind if: the utility boiler of anthracite and lean coal can realize starting and stable combustion, and save fuel oil.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural diagram of the micro oil burner of the present invention.
In the figure: 1. a pulverized coal concentrating combustion chamber; 111. a refractory and wear-resistant composite layer; 112. a connecting pipe; 113. a compressed air pipe; 114. a diesel feed pipe; 115. a high-pressure air inlet pipe; 116. a pulverized coal concentrating ring; 117. an image monitoring device; 118. fire detection of coal dust; 2. a refractory wear-resistant composite sintered layer; 3. wear-resistant guide elbows; 4. concentrating the bluff body; 5. a micro-oil burner; 6. an oxygen-assisted air combustion chamber; 7. a tapered necking; 8. and (5) a secondary air box.
Detailed Description
Please refer to fig. 1 and fig. 2 in combination, wherein fig. 1 is a schematic structural diagram of the present invention; fig. 2 is a schematic structural diagram of the micro oil burner of the present invention. The tiny-oil ignition device for the pulverized coal combustion of the difficult-to-combust coal comprises: the coal powder concentrating combustion chamber 1 is internally provided with a fire-resistant and wear-resistant composite sintering layer 2;
the wear-resistant guide elbow 3 is arranged on one side of the pulverized coal concentrating combustion chamber 1, and the wear-resistant guide elbow 3 is communicated with the pulverized coal concentrating combustion chamber 1;
the concentrating blunt body 4 is arranged in the wear-resistant guide elbow 3;
the micro-oil burner 5 is arranged on the wear-resistant guide elbow 3;
the combustion chamber 6 of the oxygen-assisted air, the combustion chamber 6 of the said oxygen-assisted air is set up on the concentrated combustion chamber 1 of the pulverized coal, the combustion chamber 6 of the said oxygen-assisted air communicates with concentrated combustion chamber 1 of the pulverized coal;
the tapered necking 7 is arranged on the combustion chamber 6 of the oxygen-assisted air, and the tapered necking 7 is communicated with the pulverized coal concentration combustion chamber 1;
and the secondary air box 8 is arranged on the pulverized coal concentration combustion chamber 1.
A fireproof and wear-resistant composite layer 111 is arranged in the micro-oil burner 5, a connecting pipe 112 is arranged on the micro-oil burner 5, and the connecting pipe 112 is communicated with the micro-oil burner 5.
Be equipped with compressed air pipe 113 on the connecting pipe 112, be equipped with diesel oil inlet pipe 114 on the connecting pipe 112, be equipped with high-pressure inlet pipe 115 on the connecting pipe 112.
The fire-resistant and wear-resistant composite layer 111 is provided with a pulverized coal concentration ring 116, and the micro-oil burner 5 is provided with an image monitoring device 117.
The micro-oil burner 5 is provided with a pulverized coal fire detector 118.
The micro-oil burner 5 adopts a micro-oil gasification combustion technology, fuel oil is directly crushed by high-speed jet flow of compressed air, is atomized into nano-scale superfine oil drops for combustion, and simultaneously, heat generated by combustion is used for carrying out initial heating, capacity expansion and later heating on the fuel, and evaporation and gasification of the oil drops are completed in a very short time, so that an oil gun directly combusts gas fuel in a normal combustion process, thereby greatly improving the combustion efficiency and the flame temperature, the flame after gasification combustion has extremely strong rigidity, the propagation speed of the flame exceeds the sonic speed, the flame is completely transparent (the root is blue, the middle and the tail are transparent and white), and the central temperature of the flame is as high as 1500-2000 ℃;
if the coal dust airflow reaches the ignition temperature, a certain amount of heat must be provided to ignite the coal dust, and the ignition heat is calculated as follows:
in the above formula: b is r -is the amount of ignited coal dust, kg/h;
V 0 theoretical amount of air, m, required for the pulverized coal to be ignited 3 /h；
a r -an excess air factor;
C k -is the specific heat capacity of the secondary air, kJ (kg ℃);
r 1 -primary air rate;
q 4 incomplete combustion loss,%;
t zh -ignition temperature, ° c;
t 0 -initial temperature, deg.c, of the pulverized coal stream;
W y -applying a base water;
W mf -coal dust moisture,%;
because the flame rigidity of the small gasification oil gun is extremely strong, when the coal dust airflow enters the primary chamber and contacts with the gasification flame of the small oil gun, the gasification flame of the small oil gun cannot be blown away immediately, so that the coal dust entering the primary chamber and intersecting with the gasification combustion flame of the small oil gun is ignited and combusted in the flame of the small gasification oil gun firstly under the inertia effect, the energy is amplified for the first time in the primary chamber, and other coal dust in the secondary chamber is ignited, so that the energy is amplified for the second time, the low-load stable combustion can be realized, the oil-saving effect is obvious, the additional resistance is not large, and the advantages of small workload, safety, reliability and the like can be improved;
further proves that the 150-170 kg/h gasification combustion oil gun can ignite 500kg/h coal powder with the concentration of 0.4-0.6 kg/h, so that the coal powder flame from the primary chamber reaches the ignition energy of 2856kW/h, the coal powder can be ignited by 3-10 t/h in stages, and further the heat of the oil gun with the output of about 1.5t/h can be achieved.
The utility model provides a tiny-oil ignition device for difficult-to-burn coal type pulverized coal burning's theory of operation as follows:
the first step is as follows: because the volatile matter of the hard-burning coal, especially anthracite, is very low, a relatively large combustion space is needed to obtain more decomposition and the same coal dust burning degree, and the ideal length of flame and a proper gas flow field are mainly maintained when the anthracite is combusted. The length of the flame is very important for a micro-oil burner, if the flame is too short, the latent heat of the coal can be released only in a small volume, the temperature of the flame becomes very high locally, and conversely, if the flame length is lengthened, the temperature is reduced, and the length of the flame is mainly controlled by the driving force of the burner and the fuel quantity, so that the following results are obtained:
thrust of burner = primary air (kg/s) × burner tip wind speed (m/s)
Fuel quantity = fuel pressure (kg) × combustion-supporting air speed (m/s)
The difficult-to-burn coal type pulverized coal burner adopts a first-stage pulverized coal grid combustion chamber, a second-stage pulverized coal concentration combustion chamber and a third-stage oxygen-assisted air combustion chamber, the combustion chambers are cylindrical and are arranged on the axis in a burner spray pipe, the air resistance of the burner is reduced by axial arrangement, the second-stage pulverized coal combustion concentration combustion chamber with a concentration device is arranged at the middle and rear sections of the first-stage pulverized coal grid combustion chamber, the second-stage pulverized coal concentration combustion chamber is a key position for oil-coal co-combustion, a fire-resistant, wear-resistant and heat-insulating sintering layer is arranged to improve the fire-resistant, high-temperature and wear-resistant performance of the burner, pulverized coal enters the burner through a guide wear-resistant elbow 12 and then is partially sucked by micro-oil flame in the grid to participate in combustion, and oil flame is enhanced. The concentrated coal powder is deflected to the center of the flame by the inertia effect when passing through the concentrating ring, the light-phase coal powder is arranged around the secondary coal powder combustion chamber, the volatile matter of the concentrated coal powder is separated out under the action of high-temperature flame and is violently combusted, so that the temperature of the secondary coal powder combustion chamber is further raised, and the secondary coal powder combustion chamber is provided with a fire-resistant, wear-resistant and heat-insulating sintering layer, so that the temperature reaches and exceeds the ignition point of anthracite and lean coal, and the high temperature in the combustion chamber is sustained because the heat conductivity coefficient of the sintering layer is far lower than that of heat-resistant cast steel, so that the anthracite and lean coal are violently combusted and the light-phase coal powder is sucked to form stable and fully combusted flame. Oil-powder co-combustion primary combustion flame continues to move forward and enters into tertiary oxygen-assisted air combustion chamber, because pulverized coal flame consumes most oxygen when the concentrated combustion chamber of second grade buggy burns, be difficult to the steady combustion owing to the influence that the furnace temperature is low in earlier stage receives the lower overgrate air of temperature again after getting into furnace, so specific position before pulverized coal flame gets into furnace increases the right amount overgrate air and gets into combustion chamber supplementary oxygen volume and strengthen burning, the flame of steady combustion gets into furnace, replace the heat energy of traditional big oil gun burning, realize that power station difficult-to-burn coal boiler starts and the steady combustion, after using the device, the tiny-oil ignition can be applied to difficult-to-burn coal kind if: the utility boiler of anthracite and lean coal can realize starting and stable combustion, and save fuel oil.
It should be noted that the device structure and the accompanying drawings of the present invention mainly describe the principle of the present invention, and in the design principle, the settings of the power mechanism, the power supply system, the control system, etc. of the device are not completely described, and on the premise that the skilled person understands the principle of the present invention, the details of the power mechanism, the power supply system, and the control system can be clearly known, the control mode of the application file is automatically controlled by the controller, and the control circuit of the controller can be realized by simple programming of the skilled person in the art;
the standard parts used in the method can be purchased from the market, and can be customized according to the description of the specification and the description of the attached drawings, the specific connection mode of each part adopts conventional means such as mature bolts, rivets, welding and the like in the prior art, the machinery, parts and equipment adopt conventional models in the prior art, and the structure and the principle of the parts are known by technical manuals or conventional experimental methods for technicians in the field.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and it is intended that the scope of the invention be defined by the appended claims and their equivalents and that all such modifications are intended to be encompassed by the scope of the invention as defined in the claims.
Claims (5)
1. A tiny-oil ignition device for coal dust combustion of difficult-to-combust coal, which is characterized by comprising:
the coal dust concentrating combustion chamber is internally provided with a fire-resistant wear-resistant composite sintering layer;
the wear-resistant guide elbow is arranged on one side of the pulverized coal concentration combustion chamber and communicated with the pulverized coal concentration combustion chamber;
the concentrated blunt body is arranged in the wear-resistant guide elbow;
the micro-oil burner is arranged on the wear-resistant guide elbow;
the combustion chamber of the oxygen-assisted air is arranged on the pulverized coal concentration combustion chamber, and the combustion chamber of the oxygen-assisted air is communicated with the pulverized coal concentration combustion chamber;
the tapered necking is arranged on the combustion chamber of the oxygen-assisted air and communicated with the pulverized coal concentration combustion chamber;
and the secondary air box is arranged on the pulverized coal concentration combustion chamber.
2. The micro-oil ignition device for the pulverized coal combustion of the difficult-to-combust coal kind according to claim 1, characterized in that: and a fireproof and wear-resistant composite layer is arranged in the micro-oil burner, and a connecting pipe is arranged on the micro-oil burner and is communicated with the micro-oil burner.
3. The micro-oil ignition device for the pulverized coal combustion of the difficult-to-combust coal kind according to claim 2, characterized in that: the connecting pipe is provided with a compressed air pipe, a diesel oil inlet pipe and a high-pressure air inlet pipe.
4. The micro-oil ignition device for the pulverized coal combustion of the difficult-to-combust coal kind according to claim 2, characterized in that: the fire-resistant and wear-resistant composite layer is provided with a pulverized coal concentration ring, and the micro-oil burner is provided with an image monitoring device.
5. The micro-oil ignition device for the pulverized coal combustion of the difficult-to-combust coal kind according to claim 1, characterized in that: and the micro-oil burner is provided with a pulverized coal fire detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220944907.3U CN217584450U (en) | 2022-04-22 | 2022-04-22 | Micro-oil ignition device for pulverized coal combustion of difficult-to-burn coal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220944907.3U CN217584450U (en) | 2022-04-22 | 2022-04-22 | Micro-oil ignition device for pulverized coal combustion of difficult-to-burn coal |
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| Publication Number | Publication Date |
|---|---|
| CN217584450U true CN217584450U (en) | 2022-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220944907.3U Active CN217584450U (en) | 2022-04-22 | 2022-04-22 | Micro-oil ignition device for pulverized coal combustion of difficult-to-burn coal |
Country Status (1)
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| CN (1) | CN217584450U (en) |
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2022
- 2022-04-22 CN CN202220944907.3U patent/CN217584450U/en active Active
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