CN206973531U - A kind of automatic stable burning system for opposed firing boiler - Google Patents
A kind of automatic stable burning system for opposed firing boiler Download PDFInfo
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- CN206973531U CN206973531U CN201720814260.1U CN201720814260U CN206973531U CN 206973531 U CN206973531 U CN 206973531U CN 201720814260 U CN201720814260 U CN 201720814260U CN 206973531 U CN206973531 U CN 206973531U
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- oxygen
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Abstract
The utility model belongs to large-sized station boiler low-load combustion-stabilizing field,More particularly to a kind of automatic stable burning system for opposed firing boiler,Mainly solve the problems, such as big with oil mass during opposed firing boiler low-load combustion-stabilizing,The utility model includes high temperature superheater,Oxygen heating arrangement,Low-temperature reheater,Turbulent burner,High temperature oxygen rifle component and coal dust pipe bend etc.,Oxygen temperature is heated to 800 DEG C using the high-temperature flue gas of boiler tail,Then high-temperature oxygen component is passed through,It is transported to the nozzle and breeze airflow turbulent closure scheme of turbulent burner,Utilize its hot properties and the stable coal dust firing of strong oxidizing property,By changing the diffusion angle of high-temperature oxygen and the circulating flow strength of high-temperature flue gas,It disclosure satisfy that the needs of different operating conditions,Enough so that the minimum oil-free of boiler, which surely fires load, can be reduced to the 20% of rated load,Realize the target that oil-free is surely fired.
Description
Technical field
The utility model belongs to large-sized station boiler low-load combustion-stabilizing field, and in particular to it is a kind of for opposed firing boiler from
Dynamic steady combustion system.
Background technology
In depth peak regulation, frequent long-time underrun causes, it is necessary to put into oil gun combustion-supporting station boiler to user
Heavy financial burden.According to statistics, the annual stable combustion oil amount of 600MW large-sized station boiler averagely about 400 tons of left sides
It is right.
For such case, China have developed various fuel-economizing stable combustion technologies to solve this problem：
Using plasma ignition and high temperature air firing technique as the oil-free stable combustion technology of representative, the technical patent is numerous, such as
For directly lighting plasma ignition device (CN1230659), the plasma ignition combustion device of generating plant pulverized coal boiler
(CN201106846), a kind of alternating-current plasma ignition device for coal-fired boiler in power plant (CN202048592U), pulverized-coal fired boiler high temperature are empty
Gas igniter (CN2591434) etc., such technology transform boiler lower floor coal burner as start-up burner, meanwhile,
Improved burner is allowd to realize that oil-free is surely fired, but the burner of the type is mainly oily to save boiler cold-state
Design, the poor-performing of its low nitrogen burning, so the technology can be only applied to one layer of boiler bottom (or bottom two layers)
The transformation of burner, and remaining burner is in underload or in emergency circumstances, it is still desirable to throw the steady combustion of oil.
It transform the stable combustion technology of representative as with burner structure, this aspect patent is numerous, such as efficient, low Nox, Qiang Wen
The double-primary-air duct coal dust main burner (CN1059022A) of combustion, combined coal powder burner (CN1239763), one kind
Wedge passive burner 9CN1046795) etc., the different degrees of low-load performance for improving boiler of such technology, but together
When have some limitations, mainly there is the requirement that minimum steady fires load in such technology, when less than it is respective most
During low steady combustion load, the stable burning of coal dust just cannot ensure, it is still necessary to big oil gun is put into, so such technology is not already really
Ultra-low load oil-free stable combustion technology, it is impossible to meet the needs of boiler for deeply peak regulation.
Utility model content
The purpose of this utility model is that solution opposed firing boiler turbulent burner is big with oil mass during low-load combustion-stabilizing
The boiler of problem, especially burning inferior coal, fuel consumption are very huge.A kind of principle of the utility model offer is advanced, structure is simple
The high-temperature oxygen smooth combustion apparatus of single turbulent burner that is used to liquidate, replaces fuel oil with high-temperature oxygen, realizes that oil-free is surely fired, reduce
The operating cost of boiler at low load operating mode.
In order to solve the above technical problems, the technical solution adopted in the utility model is：
A kind of automatic stable burning system for opposed firing boiler, including high temperature superheater, oxygen heating arrangement, cold reheat
Device, turbulent burner, high temperature oxygen rifle component and coal dust pipe bend, the high temperature superheater, oxygen heating arrangement and cold reheat
Device is arranged in the flue of opposed firing boiler afterbody along flow of flue gas direction successively, and turbulent burner is located at opposed firing boiler lower furnace portion
Front-back wall on, the connection of the entrance of coal dust pipe bend and turbulent burner, high temperature oxygen rifle component level is through coal dust pipe bend
Tube wall simultaneously stretches into the center for being arranged on turbulent burner, and the nozzle of high temperature oxygen rifle component is located at going out for turbulent burner
Kou Chu positions, the gas outlet of oxygen heating arrangement are connected with the air inlet of high temperature oxygen rifle component.
The oxygen heating arrangement is by electric control valve a, b, c, pressure transmitter, safety valve, oxygen heater, thermocouple
A, b, jet mixer, pneumatic shut-off valve and control system composition, entrance and the compressed air main pipe of the electric control valve a connect
Logical, electric control valve b entrance connects with oxygen main pipe, electric control valve a outlet and electric control valve b outlet,
Electric control valve a outlet leads to high temperature oxygen rifle component by electric control valve c, and electric control valve b and oxygen heater enter
Mouth connection, the outlet of oxygen heater are divided into two pipelines, and a pipeline leads to high temperature oxygen rifle component, and another pipeline is by penetrating
Stream blender and pneumatic shut-off valve lead to spacious place, and pressure transmitter, safety valve are located at electric control valve b and oxygen heater
In connecting pipeline, thermocouple a, b are respectively provided on the tube wall of oxygen heater and the outlet line of oxygen heating arrangement, control system
System is connected with electric control valve a, b, c, pressure transmitter, thermocouple a, b and pneumatic shut-off valve and controls its work.
The high temperature oxygen rifle component is led by expansion flow cone, flow deflector, cyclone cylinder, plate with oxygen, pull bar, locating piece, annular oxygen
Pipe and handwheel composition, the plate with oxygen are located at the left port of annular oxygen catheter, the inner ring surface connection of cyclone cylinder and plate with oxygen, led
Flow is located in the barrel chamber of cyclone cylinder, and pull bar is coaxially located at by locating piece level in the tube chamber of annular oxygen catheter, and makes drawing
The left end of bar stretches out the left port of annular oxygen catheter through plate with oxygen and cyclone cylinder, and the right-hand member of pull bar is stretched out annular oxygen
The right-hand member connection of the right output port of conduit, handwheel and pull bar, the left end for expanding flow cone and pull bar connects, in the right-hand member of annular oxygen catheter
Side wall is provided with oxygen intake and connected with the annular chamber of annular oxygen catheter.
The scope of the angle of flare α for expanding flow cone is between 30 ° -90 °.
The utility model uses above technical scheme, compared with background technology, has the advantages that：
(1) the utility model is creatively substituted in the center of opposed firing boiler turbulent burner with high temperature oxygen rifle component
Original oil gun component, by high-temperature oxygen in a manner of rotating jet with breeze airflow turbulent closure scheme, have in itself using oxygen
Some strong oxidizing properties carry out combustion-supporting coal dust, instead of it is original with fuel oil come the mode of combustion-supporting coal dust, realize opposed firing boiler eddy flow
Burner low-load combustion-stabilizing " zero oil consumption "；
(2) installation site of the oxygen heating system of the utility model selection is relatively new.The material of oxygen heater is
Stainless steel 2520, the Long-term service temperature that this kind of material allows is 1250 DEG C, it is contemplated that the working media of the system is high temperature oxygen
Gas is, it is necessary to leave certain surplus, and therefore, the threshold limit value of the surface temperature of oxygen heater is set to 900 DEG C.And boiler tail
In portion's flue flue-gas temperature positioned at 900 DEG C of region between high temperature superheater and low-temperature reheater, flue gas in the region
Temperature is arranged between high temperature superheater and low-temperature reheater in the range of 800 DEG C -900 DEG C, therefore by oxygen heating system；
(3) the utility model performs to the combustion-supporting performance of oxygen ultimate attainment.Oxygen is first before high temperature oxygen rifle component is entered
First pass through oxygen heating system to be heated, oxygen can be substantially increased by oxygen heating to 800 DEG C or so of the condition of high temperature
Combustion-supporting ability, this is also under current technical conditions, the maximum temperature that can be arrived oxygen heating using boiler existing equipment.For cigarette
Coal breeze airflow (ignition temperature is 650 DEG C -750 DEG C) and lignite breeze airflow (ignition temperature is 550 DEG C), 800 DEG C or so
High-temperature oxygen directly can ignite breeze airflow, do not influenceed by boiler load change, (caught fire for meager coal breeze airflow completely
Temperature is 900 DEG C) and anthracite breeze airflow (ignition temperature is 1000 DEG C), although 800 DEG C of high-temperature oxygen can not directly by
Breeze airflow is ignited, but coal dust can be heated to fugitive constituent Precipitation Temperature, and promotes fugitive constituent ignition, discharges heat,
And then breeze airflow is preheated to certain higher temperature in advance, reduce the ignition heat absorbed from burner hearth, shorten when catching fire
Between so that coal dust by ignition, can be equally reached the purpose of stable burning；
(4) temperature of high-temperature oxygen can automatically adjust in the scope below 800 DEG C, in the actual steady combustion process of boiler
In, according to the change of ature of coal and boiler load, required oxygen temperature value is set in control system, when the oxygen that thermocouple b is measured
When temperature value is less than setting value, electric control valve c is turned down automatically, reduces the flow of normal temperature oxygen, in total oxygen flow not
In the case of change, equivalent to the oxygen flow that enters oxygen heater is added, so that oxygen temperature rises after mixing；
Similarly, if the oxygen temperature value that thermocouple b is measured is more than setting value, big electric control valve c is opened automatically so that oxygen temperature
Decline；
(5) pressure in oxygen heater can automatically adjust, so as to be maintained within allowed band.Work as oxygen heater
When interior pressure exceedes setting value, safety valve will automatically turn on pressure release, meanwhile, pressure transmitter is by pressure signal teletransmission to unit
Control system, send instruction and open big electric control valve c automatically, reduce the oxygen flow for entering oxygen heater so that
Pressure in oxygen heater declines, and signal an alert reminds operations staff's oxygen heater pressure anomaly (if oxygen
Temperature automatic adjustment and oxygen heater pressure automatically adjust the electric control valve c sent opening degree instruction it is opposite when, preferentially hold
Row pressure automatically adjusts instruction)；
(6) wall temperature in oxygen heater can automatically adjust, so as to be maintained within allowed band.Thermocouple a is by oxygen
The wall temperature signal teletransmission of hot-air heater is to control system, (the note when wall temperature value exceedes setting value：Oxygen heater wall temperature is higher
Situation generally occur in boiler heavy-duty service because boiler load is higher, the temperature of flue gas is also higher, now boiler
Flameholding, and need not surely fire, so under the operating mode, regulating valve b is closed, and regulating valve a is in open mode),
Automatically big regulating valve a aperture is opened.When regulating valve a reaches 100%, the wall surface temperature of heater continues to rise, then beats automatically
Drive pneumatic shut-off valve, the cooling medium stream incident flow blender in heater, principle is inhaled using volume, by the cold sky in external environment condition
Gas is mixed into cooling medium so that the air themperature of mixing reduces, and is then exhausted directly to spacious place through pneumatic shut-off valve, accelerates
The flowing of cooling medium in heater so that heater wall temperature declines rapidly, it is ensured that under heater is in a safe condition；
(7) plate with oxygen and flow deflector, cyclone cylinder collective effect under, strong tangential turning effort occurs for oxygen, has
Coal dust is inhaled beneficial to volume, accelerates the mixing with coal dust；
(8) using the bluff body shape for expanding flow cone and the strong swirl velocity field of oxygen, backflow is formd in the outlet for expanding flow cone
Area, can be by the exit of furnace high-temperature smoke backflow to turbulent burner, using the heat of high-temperature flue gas come firing coal-dust；
(9) pull bar can move in the presence of handwheel along the axial location of high temperature oxygen rifle component, so change expand flow cone with
The distance between cyclone cylinder L, the purpose of adjustment oxygen eddy flow diffusion angle and smoke backflow intensity can be reached, realized online
Adjust coal powder ignition situation.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model；
Fig. 2 is the system diagram of the utility model oxygen heating arrangement；
Fig. 3 is the structure chart of the utility model high temperature oxygen rifle component；
Fig. 4 is the installation diagram of the utility model flow deflector and cyclone cylinder.
Embodiment
Principle of the present utility model and feature are described below in conjunction with accompanying drawing, example is served only for explaining this practicality
It is new, it is not intended to limit the scope of the utility model.
As shown in figure 1, a kind of automatic stable burning system for opposed firing boiler in the present embodiment, including high temperature superheater 2,
Oxygen heating arrangement 3, low-temperature reheater 5, turbulent burner 6, high temperature oxygen rifle component 7 and coal dust pipe bend 8, the hyperthermia and superheating
Device 2, oxygen heating arrangement 3 and low-temperature reheater 5 are arranged in the flue 4 of opposed firing boiler afterbody along flow of flue gas direction successively,
Turbulent burner 6 is located on the front-back wall of the bottom of opposed firing boiler burner hearth 1, and the entrance of coal dust pipe bend 8 and turbulent burner 6 connects
Connecing, high temperature oxygen rifle component 7 is arranged on the center of turbulent burner 6 horizontal through the tube wall and stretching into of coal dust pipe bend 8, and
The nozzle of high temperature oxygen rifle component 7 is set to be located at the exit position of turbulent burner 6, the gas outlet of oxygen heating arrangement 3 and high temperature
The air inlet connection of oxygen rifle component 7.
As shown in Fig. 2 the oxygen heating arrangement 3 by electric control valve 301a, 301b, 301c, pressure transmitter 302,
Safety valve 303, oxygen heater 304, thermocouple 305a, 305b, jet mixer 306, pneumatic shut-off valve 307 and control system
308 compositions, the entrance of the electric control valve 301a connect with compressed air main pipe, electric control valve 301b entrance and oxygen
Main pipe connects, electric control valve 301a outlet and electric control valve 301b outlet, electric control valve 301a outlet
High temperature oxygen rifle component 7 is led to by electric control valve 301c, electric control valve 301b is connected with the import of oxygen heater 304,
The outlet of oxygen heater 304 is divided into two pipelines, and a pipeline leads to high temperature oxygen rifle component 7, and another pipeline passes through jet
Blender 306 and pneumatic shut-off valve 307 lead to spacious place, and pressure transmitter 302, safety valve 303 are located at electric control valve 301b
With in the connecting pipeline of oxygen heater 304, thermocouple 305a, 305b are respectively provided at the tube wall and oxygen of oxygen heater 304
On the outlet line of heater 3, control system 308 and electric control valve 301a, 301b, 301c, pressure transmitter 302, heat
Galvanic couple 305a, 305b and pneumatic shut-off valve 307 connect and control its work.
As shown in Figure 3 and Figure 4, the high temperature oxygen rifle component 7 by expansion flow cone 701, flow deflector 702, cyclone cylinder 703, with oxygen
Disk 704, pull bar 705, locating piece 706, annular oxygen catheter 707 and handwheel 708 form, and the plate with oxygen 704 is located at annular oxygen
The left port of airway 707, cyclone cylinder 703 are connected with the inner ring surface of plate with oxygen 704, and flow deflector 702 is located at the cylinder of cyclone cylinder 703
In chamber, pull bar 705 is coaxially located in the tube chamber of annular oxygen catheter 707 by the way that locating piece 706 is horizontal, and makes a left side for pull bar 705
The left port of annular oxygen catheter 707 is stretched out at end through plate with oxygen 704 and cyclone cylinder 703, and the right-hand member of pull bar 705 is stretched out ring
The right output port of shape oxygen catheter 707, handwheel 708 are connected with the right-hand member of pull bar 705, and the left end for expanding flow cone 701 and pull bar 705 connects
Connect, the scope of the angle of flare α for expanding flow cone 701 is between 60 °.Oxygen is provided with the right end sidewalls of annular oxygen catheter 707
Entrance 709 and connected with the annular chamber of annular oxygen catheter 707.
The scope of the angle of flare α for expanding flow cone 701 can also be between 30 ° -90 °.
Preferred embodiment of the present utility model is the foregoing is only, it is all in this practicality not to limit the utility model
Within new spirit and principle, any modification, equivalent substitution and improvements made etc., guarantor of the present utility model should be included in
Within the scope of shield.
Claims (4)
- A kind of 1. automatic stable burning system for opposed firing boiler, it is characterised in that：Filled including high temperature superheater (2), oxygen heating Put (3), low-temperature reheater (5), turbulent burner (6), high temperature oxygen rifle component (7) and coal dust pipe bend (8), the hyperthermia and superheating Device (2), oxygen heating arrangement (3) and low-temperature reheater (5) are arranged on the cigarette of opposed firing boiler afterbody along flow of flue gas direction successively In road (4), turbulent burner (6) is located on the front-back wall of opposed firing boiler burner hearth (1) bottom, and coal dust pipe bend (8) fires with eddy flow The entrance connection of burner (6), high temperature oxygen rifle component (7) horizontal through coal dust pipe bend (8) tube wall and stretch into and be arranged on eddy flow The center of burner (6), and the nozzle of high temperature oxygen rifle component (7) is located at the exit position of turbulent burner (6), oxygen The gas outlet of gas heater (3) is connected with the air inlet of high temperature oxygen rifle component (7).
- A kind of 2. automatic stable burning system for opposed firing boiler according to claim 1, it is characterised in that：The oxygen adds Thermal (3) is by electric control valve (301a, 301b, 301c), pressure transmitter (302), safety valve (303), oxygen heater (304), thermocouple (305a, 305b), jet mixer (306), pneumatic shut-off valve (307) and control system (308) composition, institute The entrance for stating electric control valve (301a) connects with compressed air main pipe, and entrance and the oxygen main pipe of electric control valve (301b) connect It is logical, the outlet of electric control valve (301a) and the outlet of electric control valve (301b), the outlet of electric control valve (301a) High temperature oxygen rifle component (7) is led to by electric control valve (301c), electric control valve (301b) enters with oxygen heater (304) Mouth connection, the outlet of oxygen heater (304) are divided into two pipelines, and a pipeline leads to high temperature oxygen rifle component (7), another pipe Line leads to spacious place, pressure transmitter (302), safety valve (303) by jet mixer (306) and pneumatic shut-off valve (307) It is located at electric control valve (301b) and in the connecting pipeline of oxygen heater (304), thermocouple (305a, 305b) is respectively provided at oxygen On the tube wall of hot-air heater (304) and the outlet line of oxygen heating arrangement (3), control system (308) and electric control valve (301a, 301b, 301c), pressure transmitter (302), thermocouple (305a, 305b) and pneumatic shut-off valve (307) are connected and controlled Its work.
- A kind of 3. automatic stable burning system for opposed firing boiler according to claim 1 or 2, it is characterised in that：The height Warm oxygen rifle component (7) is by expansion flow cone (701), flow deflector (702), cyclone cylinder (703), plate with oxygen (704), pull bar (705), positioning Block (706), annular oxygen catheter (707) and handwheel (708) composition, the plate with oxygen (704) are located at annular oxygen catheter (707) Left port, cyclone cylinder (703) is connected with the inner ring surface of plate with oxygen (704), and flow deflector (702) is located at the cylinder of cyclone cylinder (703) In chamber, pull bar (705) is coaxially located in the tube chamber of annular oxygen catheter (707) by the way that locating piece (706) is horizontal, and makes pull bar (705) left end stretches out the left port of annular oxygen catheter (707) through plate with oxygen (704) and cyclone cylinder (703), and makes pull bar (705) right-hand member stretches out the right output port of annular oxygen catheter (707), and handwheel (708) is connected with the right-hand member of pull bar (705), expands stream Cone (701) is connected with the left end of pull bar (705), annular oxygen catheter (707) right end sidewalls provided with oxygen intake (709) and Connected with the annular chamber of annular oxygen catheter (707).
- A kind of 4. automatic stable burning system for opposed firing boiler according to claim 3, it is characterised in that：The expansion flow cone (701) angle of flare α scope is between 30 ° -90 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720814260.1U CN206973531U (en) | 2017-07-06 | 2017-07-06 | A kind of automatic stable burning system for opposed firing boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720814260.1U CN206973531U (en) | 2017-07-06 | 2017-07-06 | A kind of automatic stable burning system for opposed firing boiler |
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| Publication Number | Publication Date |
|---|---|
| CN206973531U true CN206973531U (en) | 2018-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720814260.1U Expired - Fee Related CN206973531U (en) | 2017-07-06 | 2017-07-06 | A kind of automatic stable burning system for opposed firing boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107228356A (en) * | 2017-07-06 | 2017-10-03 | 山西大学 | A kind of automatic stable burning system for opposed firing boiler |
-
2017
- 2017-07-06 CN CN201720814260.1U patent/CN206973531U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107228356A (en) * | 2017-07-06 | 2017-10-03 | 山西大学 | A kind of automatic stable burning system for opposed firing boiler |
| CN107228356B (en) * | 2017-07-06 | 2023-05-30 | 山西大学 | Automatic stable combustion system for opposite-flushing boiler |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180206 Termination date: 20200706 |