CN207247265U - A kind of wind powder mixing temperature and flow velocity secondary regulation system - Google Patents
A kind of wind powder mixing temperature and flow velocity secondary regulation system Download PDFInfo
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- CN207247265U CN207247265U CN201720901504.XU CN201720901504U CN207247265U CN 207247265 U CN207247265 U CN 207247265U CN 201720901504 U CN201720901504 U CN 201720901504U CN 207247265 U CN207247265 U CN 207247265U
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Abstract
The utility model discloses a kind of wind powder mixing temperature and flow velocity secondary regulation system,The air outlet of primary air fan is divided into two-way,Wherein it is connected all the way through air preheater with the hot-wind inlet of regulating system and the entrance of the first valve,The outlet of first valve is connected with the air intake vent of coal pulverizer,Another way is connected with the cold air inlet of regulating system and the entrance of the second valve,The outlet of second valve is connected with the air intake vent of coal pulverizer,The outlet of feeder is connected with the coal-in port of coal pulverizer,The outlet of coal pulverizer is connected with wind powder gas-particle two-phase temperature with the outlet of flow velocity regulating system with the entrance of burner on boiler,The system can realize the Secondary Control of wind coal mixing temperature and flow velocity,The pulverized coal channel caused by primary air velocity is relatively low is effectively solved to be tempered,Coking and water-cooling wall tube wall temperature overtemperatute around spout scaling loss and burner,To ensure system safe and stable operation,Improve coal dust burnout rate at the same time,Boiler at low load combustion stability and unit operation flexibility.
Description
Technical field
The utility model belongs to steam power plant field, is related to a kind of wind powder mixing temperature and flow velocity Secondary Control system
System.
Background technology
The pulverized coal preparation system subsidiary engine equipment important as generating plant pulverized coal boiler, its whether safe and stable operation to station boiler extremely
Close important.In pipeline product coal detonation be threaten pulverized coal preparation system (coal pulverizer) and its unicom equipment, pulverized coal channel security it is important
Factor, based on this, by strictly controlling coal pulverizer import mixing air temperature, going out one's intention as revealed in what one says powder mixing temperature in each station boiler operation
Spend to ensure system safety.《Power station coal pulverizer and pulverized coal preparation system type selecting directive/guide》Different mills are given in (DL/T 466-2004)
The maximum temperature that outlet allows when coal machine type grinds different types of coal, the country uses lignite station boiler substantially by mixture temperature
Control is below 63 DEG C, and control is below 83 DEG C when using bituminous coal.
CO separates out Judging index and influence factor of the concentration as pulverized coal preparation system explosion-proof security in volatile ingredient, it is separated out
Temperature is about more than 260 DEG C, and coal pulverizer goes out one's intention as revealed in what one says powder mixing temperature far below Volatile temperature in raw coal in actual motion,
Only because coal pulverizer internal structure is complicated and coal dust is easy to gather, while coal pulverizer inlet wind-warm syndrome is limited to, can only kept
Cold operation.In addition, when actually using the full water content of coal and being more than design coal, in current device and its subsidiary conduit situation
Under, it is often lower that coal pulverizer goes out one's intention as revealed in what one says powder mixing temperature, reduces unit and uses coal adaptability.To prevent coal dust from entering combustion
Catch fire before burner and set off an explosion or scaling loss burner,《Thermal power plant pulverized coal preparation system design computing technique regulation》(DL/T
Regulation bituminous coal gas-solid mixture temperature t in 5145-2002)max≤ 160 DEG C, lignite tmax≤100℃.As it can be seen that run base in custom
On plinth, rationally improve coal pulverizer and export wind powder mixture temperature considers it is feasible from angle safe for operation.
Although coal can largely be reduced by strictly controlling coal pulverizer import mixing air temperature and going out one's intention as revealed in what one says powder mixing temperature
Powder deflagration event probability, but its adverse effect has at following 3 points：
First, cold wind intake increases, and exhaust gas temperature can be caused to raise, and according to site test results, coal pulverizer goes out one's intention as revealed in what one says
Powder mixing temperature is improved to after 90 DEG C from 76 DEG C, and exhaust gas temperature can decline 9.8 DEG C, can reduce net coal consumption rate about 1.5g/ (kW
h)。
Second, wind powder mixing temperature is relatively low in pulverized coal channel can reduce combustion rate, increase ignition distance, reduce coal
Powder burnout rate, in high altitude localities, the above problem can seem more prominent.
3rd, implement the flexibility transformation of 2.2 hundred million kilowatts of coal units during China's plan " 13 ", how to improve pot
Stove low-load combustion-stabilizing ability becomes its main goal in research, and relatively low coal dust mixing temperature is obviously unfavorable for stablizing burning.With
High load capacity is compared, and the appointment of quality of pc concentration reduces 80g/m in pulverized coal channel in the case of underload3, specific coal dust most produces shockingly
Fried index, maximum explosion pressure and maximum explosion pressure climbing speed decrease, and are mixed compared to middle and high unit load leeward powder
Closing temperature can have been lifted.
In addition, when coal-fired off-design coal, caused burner scaling loss relatively low to primary air velocity, burner region water cooling
The problems such as wall overtemperature of tube wall and spout coking, existing firing optimization means restrictive condition is more and influences limited, it is therefore desirable to designs
Go out a kind of system, which can adjust the temperature and flow velocity of specific pulverized coal channel wind coal mixing, to solve the above problems.
Utility model content
The purpose of the utility model is to overcome the shortcomings that the above-mentioned prior art, there is provided a kind of wind powder mixing temperature and stream
Fast secondary regulation system, the system can realize the adjusting of wind coal mixing temperature and flow velocity, to ensure system safe and stable operation,
Improve coal dust burnout rate, boiler at low load combustion stability and unit operation flexibility at the same time.
To reach above-mentioned purpose, wind powder mixing temperature described in the utility model and flow velocity secondary regulation system are included once
Wind turbine, air preheater, wind powder gas-particle two-phase temperature and flow velocity regulating system, the first valve, the second valve, feeder, coal-grinding
Machine and boiler；
The air outlet of primary air fan is divided into two-way, wherein all the way through air preheater and wind powder gas-particle two-phase temperature and flow velocity
The entrance of the hot-wind inlet of regulating system and the first valve is connected, and the outlet of the first valve is connected with the air intake vent of coal pulverizer
Logical, another way is connected with wind powder gas-particle two-phase temperature with the cold air inlet of flow velocity regulating system and the entrance of the second valve, the
The outlet of two valves is connected with the air intake vent of coal pulverizer, and the outlet of feeder is connected with the coal-in port of coal pulverizer, coal pulverizer
Outlet and the outlet of wind powder gas-particle two-phase temperature and flow velocity regulating system entered by burner on pipeline and Guan Houyu boilers
Mouth is connected.
The wind powder gas-particle two-phase temperature includes the 3rd valve, the 4th valve and the 5th valve with flow velocity regulating system, its
In, the outlet of the heat primary air of air preheater is connected with the entrance of the 3rd valve, a cold ducting outlet for primary air fan and
The entrance of 4th valve is connected, and the outlet of the 3rd valve and the outlet of the 4th valve are connected with the entrance of the 5th valve, the
The outlet of five valves is connected with the outlet of coal pulverizer by the entrance of burner on pipeline and Guan Houyu boilers.
Further include and adjust wind main pipe, adjust wind branch pipe and pulverized coal channel, the outlet of the 3rd valve and the outlet of the 4th valve
It is connected with the entrance for adjusting wind main pipe, the outlet for adjusting wind main pipe is connected with adjusting the entrance of wind branch pipe, the 5th valve position
In adjusting on wind branch pipe, the outlet of coal pulverizer is connected with the entrance of pulverized coal channel, adjusts outlet and the pulverized coal channel of wind branch pipe
By pipeline, simultaneously the entrance of burner is connected on Guan Houyu boilers for outlet.
It is provided with adjusting wind main pipe and adjusts the pressure gauge of wind pressure in wind main pipe, for detecting adjusting wind mother for detecting
The thermometer of air temperature and the flowmeter for detecting wind flow in adjusting wind main pipe in pipe.
One burner corresponds to one and adjusts wind branch pipe and a pulverized coal channel, and the number of burner is 4-8.
One adjusts wind main pipe and corresponds to 4-8 roots adjusting wind branch pipe.
The utility model has the advantages that：
Wind powder mixing temperature described in the utility model and flow velocity secondary regulation system in concrete operations, primary air fan
Outlet is divided into two-way, wherein all the way through air preheater and wind powder gas-particle two-phase temperature and flow velocity regulating system and the first valve phase
Connection, another way are connected with wind powder gas-particle two-phase temperature with flow velocity regulating system and the second valve, the first valve and the second valve
Door is connected with the air intake vent of coal pulverizer, the outlet of wind powder gas-particle two-phase temperature and flow velocity regulating system and the outlet of coal pulverizer and
The entrance of burner is connected, and the temperature and stream of First air in coal pulverizer are entered by the first valve and the second valve regulated
Speed, the temperature and flow velocity for entering burner apoplexy are adjusted by wind powder gas-particle two-phase temperature and flow velocity regulating system, so that
The mixing temperature and flow velocity of wind powder regulate and control to safety economy section, then inject in boiler and burn through burner again, and then ensure
System safe and stable operation, improves coal dust burnout rate, boiler at low load combustion stability and unit operation flexibility.In addition, need
It is noted that the utility model on the basis of pulverized coal preparation system safe operation is ensured, can not only improve combustion rate and
Boiler low load stable combustion ability, reduces exhaust gas temperature and unburned combustible in fly ash, improves unit operation flexibility, economy and coal
Kind of adaptability, solves due to water near coal dust plugging, tempering, spout scaling loss and burner nozzle caused by air hose wind speed is relatively low
Cold wall wall temperature is higher or even the problems such as inclined burning.
Brief description of the drawings
Fig. 1 is the structure diagram of the utility model；
Fig. 2 is the structure diagram of the utility model apoplexy powder gas-particle two-phase temperature and flow velocity regulating system 6.
Wherein, 1 it is boiler, 2 be primary air fan, 3 be air preheater, 4 be coal pulverizer, 5 be feeder, 6 is wind powder gas
Gu two-phase temperature and flow velocity regulating system, 7 be burner, 8 be adjust wind main pipe, 9 be pulverized coal channel, 10 be adjusting wind branch pipe.
Embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings：
With reference to figure 1, wind powder mixing temperature described in the utility model and flow velocity secondary regulation system include primary air fan 2,
Air preheater 3, wind powder gas-particle two-phase temperature and flow velocity regulating system 6, the first valve, the second valve, feeder 5, coal pulverizer 4
And boiler 1；The air outlet of primary air fan 2 is divided into two-way, wherein all the way through air preheater 3 and wind powder gas-particle two-phase temperature and stream
The hot-wind inlet of fast regulating system 6 and the entrance of the first valve are connected, the outlet of the first valve and the air intake vent phase of coal pulverizer 4
Connection, another way are connected with wind powder gas-particle two-phase temperature with the cold air inlet of flow velocity regulating system 6 and the entrance of the second valve,
The outlet of second valve is connected with the air intake vent of coal pulverizer 4, and the outlet of feeder 5 is connected with the coal-in port of coal pulverizer 4, mill
Simultaneously burnt with wind powder gas-particle two-phase temperature and the outlet of flow velocity regulating system 6 by pipeline on Guan Houyu boilers 1 outlet of coal machine 4
The entrance of device 7 is connected.
The wind powder gas-particle two-phase temperature includes the 3rd valve, the 4th valve and the 5th valve with flow velocity regulating system 6, its
In, the heat primary air road outlet of air preheater 3 is connected with the entrance of the 3rd valve, and the cold First air of primary air fan 2 is said
Mouth is connected with the entrance of the 4th valve, and the outlet of the 3rd valve and the outlet of the 4th valve are connected with the entrance of the 5th valve
Logical, the outlet of the 5th valve is connected with the outlet of coal pulverizer 4 by the entrance of burner 7 on pipeline and Guan Houyu boilers 1.
The utility model further includes and adjusts wind main pipe 8, adjusts wind branch pipe 10 and pulverized coal channel 9, the outlet of the 3rd valve and
The outlet of 4th valve is connected with adjusting the entrance of wind main pipe 8, adjusts entrance of the outlet of wind main pipe 8 with adjusting wind branch pipe 10
It is connected, positioned at adjusting on wind branch pipe 10, the outlet of coal pulverizer 4 is connected the 5th valve with the entrance of pulverized coal channel 9, adjusts wind
The outlet of branch pipe 10 is connected with the outlet of pulverized coal channel 9 by the entrance of burner 7 on pipeline and Guan Houyu boilers 1.
Adjust to be provided with wind main pipe 8 and adjust the pressure gauge of wind pressure in wind main pipe 8, for detecting adjusting wind for detecting
The thermometer of air temperature and the flowmeter for detecting wind flow in adjusting wind main pipe 8 in main pipe 8；One burner 7 corresponds to
One adjusts wind branch pipe 10 and a pulverized coal channel 9, and the number of burner 7 is 4-8；One adjusts wind main pipe 8 and corresponds to 4-8 root tune
Save wind branch pipe 10.
2 exit flow of primary air fan is divided into two-way, enters coal pulverizer 4 after the heating of air preheater 3 all the way and adjusts wind
In main pipe 8, another way enters directly into coal pulverizer 4 and adjusts in wind main pipe 8, the two-way air-flow in wind main pipe 8 is adjusted into
Capable mixing, raw coal enters in coal pulverizer 4 through feeder 5 and coal spout to be ground and dries, and is then carried along into coal by air-flow
In powder pipeline 9, and wind powder mixing temperature and flow velocity are regulated and controled to safety by wind powder gas-particle two-phase temperature and flow velocity regulating system 6
Economic section, then injects burning in boiler 1 through burner 7.
Based on this, the utility model does not change the 4 original method of operation of coal pulverizer, 4 entrance mixing air temperature of coal pulverizer substantially
And coal pulverizer 4 go out one's intention as revealed in what one says powder mixing temperature still according to《Power station coal pulverizer 4 and pulverized coal preparation system type selecting directive/guide》(DL/T 466-
2004) associated recommendation value is controlled, the cold First air that primary air fan 2 is exported with through air preheater 3 heat heat once
Wind, which introduces, adjusts wind main pipe 8, and it is 3.0kPa or so to make pressure in adjusting wind main pipe 8, and temperature is 200 DEG C~270 DEG C, passes through adjusting
Wind branch pipe 10 will adjust wind and be introduced into pulverized coal channel 9, and the 5th Valve controlling adjusted by being installed on wind branch pipe 10 is adjusted
Wind flow, wind powder gas-particle two-phase temperature is improved to 100 DEG C~160 DEG C by 63 DEG C~83 DEG C, and flexibly adjustable within this range.
In the case of burner 7 exports and is equipped with wall temperature measurement point to fiery side, wind powder gas-particle two-phase mixing temperature can be also stepped up by experiment
Degree.
Claims (6)
1. a kind of wind powder mixing temperature and flow velocity secondary regulation system, it is characterised in that including primary air fan (2), air preheat
Device (3), wind powder gas-particle two-phase temperature and flow velocity regulating system (6), the first valve, the second valve, feeder (5), coal pulverizer (4)
And boiler (1)；
The air outlet of primary air fan (2) is divided into two-way, wherein all the way through air preheater (3) and wind powder gas-particle two-phase temperature and stream
The hot-wind inlet of fast regulating system (6) and the entrance of the first valve are connected, the outlet of the first valve and the inlet air of coal pulverizer (4)
Mouth is connected, another way and wind powder gas-particle two-phase temperature and the cold air inlet of flow velocity regulating system (6) and the entrance of the second valve
It is connected, the outlet of the second valve is connected with the air intake vent of coal pulverizer (4), the outlet of feeder (5) and entering for coal pulverizer (4)
Coal mouth is connected, the outlet of the outlet of coal pulverizer (4) and wind powder gas-particle two-phase temperature and flow velocity regulating system (6) by pipeline simultaneously
The entrance of burner (7) is connected on Guan Houyu boilers (1).
2. wind powder mixing temperature according to claim 1 and flow velocity secondary regulation system, it is characterised in that the wind powder gas
Gu two-phase temperature includes the 3rd valve, the 4th valve and the 5th valve with flow velocity regulating system (6), wherein, air preheater (3)
Heat primary air road outlet be connected with the entrance of the 3rd valve, the cold ducting outlet and the 4th valve of primary air fan (2)
Entrance be connected, the outlet of the 3rd valve and the outlet of the 4th valve are connected with the entrance of the 5th valve, the 5th valve
The outlet with coal pulverizer (4) is exported by the entrance of burner (7) on pipeline and Guan Houyu boilers (1) to be connected.
3. wind powder mixing temperature according to claim 2 and flow velocity secondary regulation system, it is characterised in that further include adjusting
Wind main pipe (8), adjust wind branch pipe (10) and pulverized coal channel (9), and the outlet of the 3rd valve and the outlet of the 4th valve are with adjusting wind
The entrance of main pipe (8) is connected, and the outlet for adjusting wind main pipe (8) is connected with adjusting the entrance of wind branch pipe (10), the 5th valve
Positioned at adjusting on wind branch pipe (10), the outlet of coal pulverizer (4) is connected with the entrance of pulverized coal channel (9), adjusts wind branch pipe (10)
The outlet of outlet and pulverized coal channel (9) be connected by the entrance of burner (7) on pipeline and Guan Houyu boilers (1).
4. wind powder mixing temperature according to claim 3 and flow velocity secondary regulation system, it is characterised in that adjust wind main pipe
(8) it is provided with and the pressure gauge of wind main pipe (8) interior wind pressure is adjusted for detecting, adjusts wind main pipe (8) interior wind-warm syndrome for detecting
The thermometer of degree and the flowmeter that wind main pipe (8) interior wind flow is adjusted for detecting.
5. wind powder mixing temperature according to claim 3 and flow velocity secondary regulation system, it is characterised in that a burner
(7) corresponding one adjusts wind branch pipe (10) and a pulverized coal channel (9), and the number of burner (7) is 4-8.
6. wind powder mixing temperature according to claim 3 and flow velocity secondary regulation system, it is characterised in that an adjusting wind
The corresponding 4-8 roots of main pipe (8) adjust wind branch pipe (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720901504.XU CN207247265U (en) | 2017-07-24 | 2017-07-24 | A kind of wind powder mixing temperature and flow velocity secondary regulation system |
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| CN201720901504.XU CN207247265U (en) | 2017-07-24 | 2017-07-24 | A kind of wind powder mixing temperature and flow velocity secondary regulation system |
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| CN207247265U true CN207247265U (en) | 2018-04-17 |
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ID=61877761
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107238101A (en) * | 2017-07-24 | 2017-10-10 | 西安热工研究院有限公司 | A kind of wind powder mixing temperature and flow velocity secondary regulation system |
| CN109539300A (en) * | 2018-09-28 | 2019-03-29 | 国网新疆电力有限公司电力科学研究院 | A kind of the primary air velocity adjusting method and dedicated coal pulverizer of boiler peak regulation |
-
2017
- 2017-07-24 CN CN201720901504.XU patent/CN207247265U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107238101A (en) * | 2017-07-24 | 2017-10-10 | 西安热工研究院有限公司 | A kind of wind powder mixing temperature and flow velocity secondary regulation system |
| CN109539300A (en) * | 2018-09-28 | 2019-03-29 | 国网新疆电力有限公司电力科学研究院 | A kind of the primary air velocity adjusting method and dedicated coal pulverizer of boiler peak regulation |
| CN109539300B (en) * | 2018-09-28 | 2023-09-01 | 国网新疆电力有限公司电力科学研究院 | Primary air speed adjusting method for boiler peak regulation and special coal mill |
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