CN109798516A - The warehouse style pulverized coal carried by hot air method of efficient low-discharging and its system - Google Patents
The warehouse style pulverized coal carried by hot air method of efficient low-discharging and its system Download PDFInfo
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- CN109798516A CN109798516A CN201910015854.XA CN201910015854A CN109798516A CN 109798516 A CN109798516 A CN 109798516A CN 201910015854 A CN201910015854 A CN 201910015854A CN 109798516 A CN109798516 A CN 109798516A
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- 239000003245 coal Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000007599 discharging Methods 0.000 title claims abstract description 12
- 239000007789 gas Substances 0.000 claims abstract description 45
- 239000000843 powder Substances 0.000 claims abstract description 32
- 239000000919 ceramic Substances 0.000 claims abstract description 22
- 238000004064 recycling Methods 0.000 claims abstract description 12
- 210000004894 snout Anatomy 0.000 claims abstract description 9
- 239000002274 desiccant Substances 0.000 claims description 12
- 239000002817 coal dust Substances 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000003546 flue gas Substances 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 238000000498 ball milling Methods 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 7
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000003517 fume Substances 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 208000011580 syndromic disease Diseases 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 210000000038 chest Anatomy 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
Classifications
-
- 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 present invention relates to a kind of warehouse style pulverized coal carried by hot air method of efficient low-discharging and its systems, solves high fume temperature existing for existing system, nitrogen oxides is high, the problems such as burn-off rate is low, technical solution includes the burner hearth connecting with air preheater, the hot-blast outlet of the air preheater is successively through hot air disperser, total air door and ball mill, tailing separator is connect with efficient ceramic filter, the discharge of the ceramic filter is sequentially connected pulverized coal bin, pulverizer coal feeder and air and powder mixer, the clean lack of gas outlet of the efficient ceramic filter is separately connected recycling air door, temperature-regulating air door and lack of gas adjust door, wherein, the recycling air door connects ball mill, the temperature-regulating air door is successively through main air intake, air and powder mixer is connected with a wind snout of burner hearth.The method of the present invention uses above system, has the advantages that simple system, simple process, energy conservation and environmental protection, reduces exhaust gas temperature, improves burn-off rate, effectively control discharged nitrous oxides.
Description
Technical field
The present invention relates to Power Plant Fuel apparatus fields, and saying specifically is a kind of warehouse style pulverized coal carried by hot air side of efficient low-discharging
Method and its system.
Background technique
Existing medium and small boiler largely uses bin system, mainly for the preparation of low volatile coal.Storehouse
Storage formula pulverized coal preparation system is divided into pulverized coal carried by hot air and two kinds of transporting pulverized coal with exhaust gas, and low volatile coal is selected pulverized coal carried by hot air, separated by fine powder
Lack of gas after device are sent into burner hearth as tertiary air, this partial moisture is high, temperature is low and microfine coal containing 10-15% it is weary
Gas, into burner hearth after influence to boiler heating surface it is very big, especially in pulverized coal preparation system shutdown process, boiler operatiopn is extremely unstable
Fixed, various indexs (steam parameter, pollutant emission index, burner hearth oxygen amount, furnace pressure) etc. are with generation big ups and downs.With
Country to discharged nitrous oxides require it is increasingly tighter after, coal unit has carried out corresponding low NO transformation.?
In low nitrogen transformation process, warehouse style powder pulverized coal carried by hot air system processed be equipped with tertiary air, and tertiary air itself belong to oxygen-enriched state without
Method meets the condition for reducing nitrogen oxides, therefore the low nitrogen of this kind of system is transformed none and succeeds, and causes boiler tail denitration also
Using excessive, tail portion clogging phenomenon is serious, is often forced to shutdown maintenance for former agent.
Currently, warehouse style pulverized coal carried by hot air system is primarily present following four problem: 1) coal adaptability is poor, volatilizees when using
When dividing higher coal, a wind-warm syndrome is excessively high to lead to tube cell and spout scaling loss；2) since the characteristics of ball mill causes lack of gas much big
In actual design value, secondary wind pressure modulability is poor, causes furnace internally-powered field unstable, causes boiler coke；3) pulverized coal preparation system leaks
Wind is serious, causes to reduce by air preheater cold wind, exhaust gas temperature increases；4) due to lack of gas accounting about 25%, First air accounting is about
25%, burnout degree accounting 25% is only left 25% as the Secondary Air of furnace internally-powered field leading factor, and tissue of having no idea is normal
Cut garden burning, therefore burnout degree often can not normally come into operation in actual operation, and discharged nitrous oxides are higher, same fuel
Twice close to unit pulverized-coal system of warehouse style pulverized coal carried by hot air system discharge index.
Summary of the invention
The purpose of the present invention is to solve above-mentioned technical problem, a kind of simple process is provided, energy conservation and environmental protection, reduces smoke evacuation
Temperature, the warehouse style pulverized coal carried by hot air method of efficient low-discharging for improving burn-off rate, effectively control discharged nitrous oxides.
The present invention also provides a kind of system for the above method, have that system is simple, is easily modified, produces and run into
This low, high safety and reliability warehouse style pulverized coal carried by hot air system of efficient low-discharging.
The method of the present invention includes that cold air is sent into the flue gas indirect heat exchange that air preheater and burner hearth are discharged to heat up to obtain hot wind,
The hot wind of air preheater is divided into two strands out, and a blast of hot air is dried the raw coal being sent into ball mill as desiccant, then takes
It is once filtered with the coal dust feeding tailing separator after levigate；Another a blast of hot air is after main air intake adjusts an air temperature
Coal dust is sent into a wind snout of burner hearth through air and powder mixer again, the fine powder and desiccant isolated through tailing separator are together
Secondary filter is carried out into ceramic filter, the qualified coal dust isolated is sent into air and powder mixer, separation through pulverized coal bin, pulverizer coal feeder
Clean lack of gas out are divided into three strands, and first strand of clean recycled air door of lack of gas mixes with a blast of hot air and adjust desiccant temperature
After be sent into ball mill, second burst of clean lack of gas is sent into main air intake after temperature-regulating air door is mixed with another a blast of hot air, and third stock is clean
Net lack of gas outlet；Cold air is filled into air preheater in order to maintain oxygen amount balance inside burner hearth, the amount of filling into is third stock cleaning lack of gas
Outer discharge capacity.
The First air that control enters in burner hearth accounts for the 20--30% of total blast volume, remaining is Secondary Air.
The coarse powder loopback ball mill isolated by tailing separator.
The clean lack of gas isolated are divided into three strands after mill exhauster arranges powder.
Present system, including the burner hearth connecting with air preheater, the hot-blast outlet of the air preheater is successively through hot air disperser, total
Air door is connect with ball mill, tailing separator and ceramic filter, and the discharge of the ceramic filter is sequentially connected coal dust
The clean lack of gas outlet of storehouse, pulverizer coal feeder and air and powder mixer, the ceramic filter is separately connected recycling air door, temperature-regulating air door
Door is adjusted with lack of gas, wherein the recycling air door connects ball mill, and the temperature-regulating air door is successively mixed through main air intake, wind powder
Clutch is connected with a wind snout of burner hearth.
The coarse powder outlet connection ball mill of the tailing separator.
The utility model has the advantages that
(1) using two-stage separation is arranged behind ball mill, tailing separator isolates coarse powder and fine powder, coarse powder loopback steel
Ball milling is levigate again, fine powder be sent into ceramic filter carry out gas solid separation, one side ceramic filter have lower resistance, accumulation of heat,
Anticorrosion, advantage resistant to high temperature.It is big for lack of gas water capacity, it is easy the characteristics of becoming damp, utilizes the accumulation of heat advantage of ceramic tube itself
Ensure that there is a phenomenon where coal dusts to be bonded on screen pipe always in system shutdown process；On the other hand, ceramic filter point
From high-efficient, the cleaning isolated is out of strength both to meet outlet, also meets reuse requirement.
(2) the clean lack of gas of ceramic filter out are divided into three strands, first strand is used to be the hot wind temperature adjustment as desiccant,
To meet the requirement of grinding machine outlet wind-warm syndrome；Second strand is First air temperature adjustment, tube cell caused by avoiding a wind-warm syndrome excessively high and spout
Scaling loss；Third stock outlet reduces amount of oxygen required for hearth combustion as the presence of outer discharge capacity, needs additionally to supplement corresponding
Air enters air preheater, and the cold wind and furnace exhaust that can fill into equivalent into air preheater at this time carry out indirect heat exchange, delivery of supplemental oxygen
While gas, the flue-gas temperature after also making heat exchange is further decreased, and the range of decrease is killed two birds with one stone up to 13-20 DEG C；
(3) tertiary air outlet increases into air preheater cold wind, and the hot blast temperature come out from air preheater can accordingly decline, because
Desiccant temperature is adjusted without in addition mixing cold wind again, simultaneously because tertiary air outlet is no longer limited by the shadow of hearth combustion
(design requirement tertiary-air velocity is greater than 50m/s to sound, otherwise can not effectively mix with high-temperature flue gas in burner hearth, cause furnace outlet knot
Burnt, a series of problems, such as unburned carbon in flue dust is high, spray water flux is big), recycling gas is clean lack of gas, because without abrasion to pipe
Gas flow rate adapts to wider in road, can satisfy the needs for adjusting desiccant temperature by recycling completely.
(4) due to third stock cleaning lack of gas outlet, it is not re-used as tertiary air and is sent into burner hearth, therefore can cancel three times in burner hearth
The associated components of wind allow Secondary Air to organize normally to cut garden burning, improve furnace to greatly improve the accounting of Secondary Air
50-60% discharged nitrous oxides are effectively reduced in burn-off rate in thorax,.
Detailed description of the invention
Fig. 1 is process flow chart of the invention and system diagram.
Wherein, 1- ball mill, 2- tailing separator, 3- ceramic filter, 4- mill exhauster, 5- temperature-regulating air door, 6- recycling
Air door, 7- main air intake, 8- hot air disperser, wind snout of 9-, the total air door of 10-, 11- pulverizer coal feeder, 12- air and powder mixer, 13- give
Coal machine, 14- run coal bin, 15- pulverized coal bin, 16- air preheater, 17- pressure fan, 18- lack of gas adjust door, 19- burner hearth.
Specific embodiment
Explanation is further explained to the present invention with reference to the accompanying drawing:
System embodiment: referring to Fig. 1, the smoke exhaust pipe of burner hearth 19 connects air preheater 16, and the air preheater 16 is indirect heat exchange
Device, the cold wind import of empty pre- gas 16 are equipped with pressure fan 17, the hot-blast outlet of air preheater 16 successively through hot air disperser 8, total air door 10 with
Ball mill 1, tailing separator 2 are connect with ceramic filter 3；The discharge of the ceramic filter 3 is sequentially connected pulverized coal bin
15, pulverizer coal feeder 11 and air and powder mixer 11, the clean lack of gas outlet of the ceramic filter 3 are separately connected recycling air door 6, adjust
Warm air door 5 and lack of gas adjust door 18, wherein the recycling air door 6 is connect through total air door 10 with ball mill 1, the tuning wind
A successively wind snout 20 connection through main air intake 7, air and powder mixer 12 and burner hearth 19 of door 5；The tailing separator 2 it is thick
Powder outlet connection ball mill 1.
Process example:
Burner hearth flue gas is discharged into the cold air that air preheater 16 is introduced with pressure fan 17 and exchanges heat, the heat after preheating
It is two strands that wind is divided to by air preheater 16, and a blast of hot air is adjusted after hot air disperser 8 with first burst of clean lack of gas of recycled air door 6
After temperature through total air door 10 as desiccant to be sent into ball mill 1 in raw coal be dried, then carry it is levigate after coal dust
It is sent into tailing separator 2 once to be filtered, the coarse powder loopback ball mill 1 isolated, the fine powder and desiccant isolated are together
Secondary filter is carried out into ceramic filter 3, the qualified coal dust isolated is sent into air and powder mixer through pulverized coal bin 15, pulverizer coal feeder 11
12；It is divided into three strands through the clean lack of gas that ceramic filter 3 is isolated, the recycled air door 6 of first burst of clean lack of gas and first strand
Hot wind mixing is sent into ball mill 1 after adjusting desiccant temperature, and second burst of clean lack of gas is mixed through temperature-regulating air door 5 with another two strands of hot winds
It is sent into a wind snout 9 of burner hearth afterwards, third stock cleaning lack of gas adjust 18 outlet of door through lack of gas；It is filled into simultaneously into air preheater 16
Cold air, the amount of filling into are the outer discharge capacity of third stock cleaning lack of gas.
Coal dust is sent into burner hearth 19 through air and powder mixer 12 again after main air intake 7 adjusts an air temperature by another a blast of hot air
A wind snout 9, wherein the primary air flow (percent by volume) that control enters in burner hearth 19 accounts for the 20-30% of total blast volume,
Remaining is Secondary Air.
It is compared with the traditional method, after being handled using the method for the present invention, is declined by the chamber flue gas temperature that air preheater 16 is discharged
13-20 DEG C, effectively recycling thermal energy, uncombusted rate reduces 40% or more in equivalent fuel burner hearth, and amount of nitrogen oxides reduces
50%；Dustiness is less than 5mg/Nm in the clean lack of gas of outlet3, all meet outlet requirement.
Claims (6)
1. a kind of warehouse style pulverized coal carried by hot air method of efficient low-discharging, the flue gas including cold air to be sent into air preheater and burner hearth discharge
Indirect heat exchange heats up to obtain hot wind, and the hot wind of air preheater is divided into two strands out, and a blast of hot air is as desiccant in feeding ball mill
Raw coal be dried, then carry it is levigate after coal dust be sent into tailing separator once filtered；Another a blast of hot air is through one
Coal dust is sent into a wind snout of burner hearth through air and powder mixer again, which is characterized in that warp after air temperature of secondary air door adjusting
The fine powder and desiccant that tailing separator is isolated enter ceramic filter together and carry out secondary filter, the qualified coal dust isolated
It is sent into air and powder mixer through pulverized coal bin, pulverizer coal feeder, the clean lack of gas isolated are divided into three strands, and first burst of clean lack of gas is recycled
Air door is mixed with a blast of hot air adjust desiccant temperature after be sent into ball mill, second burst of clean lack of gas through temperature-regulating air door with it is another
Main air intake, third stock cleaning lack of gas outlet are sent into after stock hot wind mixing；Cold air is filled into air preheater to maintain in burner hearth
Portion's oxygen amount balance, the amount of filling into are the outer discharge capacity of third stock cleaning lack of gas.
2. the warehouse style pulverized coal carried by hot air method of efficient low-discharging as described in claim 1, which is characterized in that control enters in burner hearth
First air account for the 20-30% of total blast volume, remaining is Secondary Air.
3. the warehouse style pulverized coal carried by hot air method of efficient low-discharging as described in claim 1, which is characterized in that by tailing separator point
The coarse powder loopback ball mill separated out.
4. the warehouse style pulverized coal carried by hot air method of efficient low-discharging as described in any one of claims 1-3, which is characterized in that described point
The clean lack of gas separated out are divided into three strands after mill exhauster arranges powder.
5. a kind of warehouse style pulverized coal carried by hot air system of efficient low-discharging, including the burner hearth being connect with air preheater, which is characterized in that described
The hot-blast outlet of air preheater is successively connect through hot air disperser, total air door with ball mill, tailing separator and efficient ceramic filter, institute
The discharge for stating ceramic filter is sequentially connected pulverized coal bin, pulverizer coal feeder and air and powder mixer, the efficient ceramic filter
Clean lack of gas outlet is separately connected recycling air door, temperature-regulating air door and lack of gas and adjusts door, wherein the recycling air door connects steel
Ball milling, a wind snout of the temperature-regulating air door successively through main air intake, air and powder mixer and burner hearth connect.
6. the warehouse style pulverized coal carried by hot air system of efficient low-discharging as claimed in claim 5, which is characterized in that the tailing separator
Coarse powder outlet connection ball mill.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910015854.XA CN109798516A (en) | 2019-01-08 | 2019-01-08 | The warehouse style pulverized coal carried by hot air method of efficient low-discharging and its system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910015854.XA CN109798516A (en) | 2019-01-08 | 2019-01-08 | The warehouse style pulverized coal carried by hot air method of efficient low-discharging and its system |
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| CN109798516A true CN109798516A (en) | 2019-05-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05312305A (en) * | 1992-05-14 | 1993-11-22 | Babcock Hitachi Kk | Fine powder coal combustion device and its operating method |
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| CN102889609A (en) * | 2011-07-20 | 2013-01-23 | 上海机易电站设备有限公司 | Pulverizing system of smoke drying lignite coal steel ball mill |
| CN104197362A (en) * | 2014-09-16 | 2014-12-10 | 上海理工大学 | Fume-dried closed pulverization coal-fired boiler unit with function of exhaust water recovery |
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-
2019
- 2019-01-08 CN CN201910015854.XA patent/CN109798516A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05312305A (en) * | 1992-05-14 | 1993-11-22 | Babcock Hitachi Kk | Fine powder coal combustion device and its operating method |
| CN101761933A (en) * | 2010-01-15 | 2010-06-30 | 西安热工研究院有限公司 | Low-temperature furnace smoke sucking exhaust gas and hot air drying composite powder feeding bituminous coal and meagre coal universal type powder preparing system |
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| CN104197362A (en) * | 2014-09-16 | 2014-12-10 | 上海理工大学 | Fume-dried closed pulverization coal-fired boiler unit with function of exhaust water recovery |
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| CN107327832A (en) * | 2017-02-27 | 2017-11-07 | 上海发电设备成套设计研究院 | The ultra-low load steady for improving boiler combustion characteristic for fired power generating unit fires system |
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