CN104197321B - Coal water slurry low-concentration oxygen enrichment fluidization suspension combustion method and boiler device thereof - Google Patents
Coal water slurry low-concentration oxygen enrichment fluidization suspension combustion method and boiler device thereof Download PDFInfo
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- CN104197321B CN104197321B CN201410355011.1A CN201410355011A CN104197321B CN 104197321 B CN104197321 B CN 104197321B CN 201410355011 A CN201410355011 A CN 201410355011A CN 104197321 B CN104197321 B CN 104197321B
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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
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The invention relates to a coal water slurry low-concentration oxygen enrichment fluidization suspension combustion method and boiler device. Zeolite molecular sieve oxygen enrichment devices are adopted to manufacture 24 to 30 percent of low-concentration oxygen enrichment air, the air is heated through an air preheater, primary air, secondary air and graining air pass through a fluidized bed, a secondary air opening and a coal water slurry granulator respectively to enter a combustion chamber, fluidization suspension combustion is achieved, the ignition and combustion condition of the coal water slurry boiler is improved, the ignition temperature of fuel is reduced, the combustion temperature, the combustion rate and the combustion-off rate are improved, the ignition and combustion stability of the fuel is improved, the adaption range of the coal water slurry boiler to the coal water slurry fuel is widened, and the boiler can be suitable for combusting coal water slurry made of inferior coal and also suitable for combusting sludge-coal blending coal water slurry fuel and sludge-coal slurry mixing coal water slurry fuel. The fuel cost and the production cost are reduced, the significant economic value is achieved, and the great social significance in improving the environment is achieved.
Description
Technical field
The invention belongs to CWS Fluid-suspension Combustion Technology and coal water slurry boiler technical field are and in particular to a kind of water coal
Slurry low concentration oxygen-enriched fluidization-suspension combustion mode and its boiler plant.
Background technology
Water coal slurry combusting technology is referred to as the clean combustion technique of coal, and China proceeds by water-coal-slurry from the seventies in last century
Boiler test is studied, and achieves significant progress over 40 years.At present, coal water slurry boiler is divided into fluidization-suspension combustion and atomization to suspend
Two kinds of burning.Water coal pulp fluidized suspension combustion system is had many advantages compared with atomization suspension combustion mode, such as achieves
Low-temperature burning, solves a global difficult problem for the easy coking of coal water slurry boiler, inhibits generation and discharge of nox etc. simultaneously,
Therefore CWS Fluid-suspension Combustion Technology, in field of boilers, especially obtains a wide range of applications in medium and small boiler field, quilt
It is referred to as a revolution in water coal slurry combusting technology field.But, water coal pulp fluidized suspension combustion system remains and water-coal-slurry is being fired
The adaptability of material is not wide in range, the bad adaptability especially to the coal water slurry fuel mixing colm, there is the combustion instability that catches fire,
The shortcomings of incomplete combustion.
As other Industrial Boilers or stove, fuel combustion is carried out combustion-supporting, from upper traditional coal-water-slurry boiler using air
The eighties in century, oxygen-enriched combusting, as a kind of power-saving technology, adopts oxygen-enriched office on coal-burned industrial boiler or station boiler
Portion's combustion supporting technology, has and sees document report, to the ignition temperature of reduction fuel, improves ignition temperature, improves combustion stability, minimizing
Fuel consumption has good effect, but brings increasing considerably of nox.And to so far, industrial furnace is adopted
It is higher than the test of 50% oxygenized air combustion supporting with volume percent oxygen concentration, the oxygen-enriched air preparation method being adopted is also mesh
Front generally acknowledge on Industrial Boiler and industrial furnace the oxygen-enriched mode of film and pressure-variable adsorption mode having application future most.Then, someone
Attempt on coal water slurry boiler by the way of oxygen-enriched combustion-supporting, such as " the water-coal-slurry large space of Publication No. 200410096627.8
Combustion system and its special equipment " patent of invention, this patent of invention be directed to water-coal-slurry atomization suspension combustion mode propose adopt
Oxygen concentration expressed in percentage by volume is higher than that 50% oxygen-enriched air carries out combustion-supporting, and produces oxygen-enriched air using becoming adsorption device, thus deposits
In following shortcomings and limitations: 1) excessive concentrations oxygen-enriched combustion-supporting increased generation and its discharge of heating power nox；2) it is only limitted to water coal
Slurry atomization suspension combustion mode；3) change absorption type oxygen-enriching device equipment complexity, energy consumption are too high, reach 0.4～0.55kwh/m3[o2],
For example using 1 ton of water-coal-slurry about needs to consume 500～600kwh electric energy, even with film oxygen-enriched mode power consumption also with this phase
When it is clear that losing more than gain.
Content of the invention
In order to give full play to the advantage of water coal pulp fluidized suspension combustion system, overcome coal water slurry fuel adaptability not wide
General, burning be not sufficiently stable, high concentration oxygen-enriched combustion-supporting exist again nox generate discharge increase, oxygen-enriched Preparation equipment complexity, energy consumption too high
And relatively costly shortcoming, the present invention proposition a kind of oxygen-enriched fluidization-suspension combustion method of water-coal-slurry low concentration and its boiler plant.
For solving the problems, such as prior art, the present invention adopts the following technical scheme that traditional fluidization-suspension combustion
Coal water slurry boiler device, is changed to low concentration oxygen-enriched granulation suspension combustion coal water slurry boiler device, that is, takes water coal pulp fluidized suspension
Burning, oxygen-enriched combustion-supporting, it comprises the steps:
Step one: prepare low concentration oxygen-enriched air using zeolite molecular sieve；
Step 2: low concentration oxygen-enriched air is heated by air preheater；
Step 3: through air preheater heating after low concentration oxygen-enriched air, with oxygen-enriched First air, oxygen-enriched Secondary Air and
Oxygen-enriched granulation wind passes through fluid bed, overfiren air port and water-coal-slurry pelletizer respectively and enters combustion chamber, with the water coal entering combustion chamber
Slurry fuel mixed combustion.
The oxygen volumetric concentration of the low concentration oxygen-enriched air prepared by step one is 24～30%, is prepared by step one
Low concentration oxygen-enriched air total amount needed for coal water slurry fuel burning theoretical air requirement 60～80%, described step 2 is by low concentration
Oxygen-enriched air is heated to 200～350 DEG C, then accesses combustion chamber by air feed system, wherein passes through primary air nozzle, overfiren air port
With water-coal-slurry pelletizer enter combustion chamber low concentration oxygen-enriched air account for respectively total amount 35～45%, 45～60% and 5～
10%.
Step one using the zeolite molecular sieve oxygen-enriching device that zeolite molecular sieve prepares low concentration oxygen-enriched air be provided with two groups or
Multigroup, one group therein is used for preparing low concentration oxygen-enriched air, in this group zeolite molecular sieve adsorption saturation, closes this group zeolite
Molecular sieve oxygen-enriching device, is passed through 200-350 DEG C of hot blast, passes through vent valve discharge gas, in vent valve temperature of exhaust gas simultaneously
During for 100～150 DEG C, it is passed through pressure-air cooling to room temperature, by vavuum pump, zeolite molecular sieve is evacuated to -50～-
80kpa parsing regeneration；Open him simultaneously and organize zeolite molecular sieve oxygen-enriching device and prepare low concentration oxygen-enriched air.
A kind of application any of the above-described claim described in method boiler plant, including fluidization-suspension combustion system,
It is attached to the water-coal-slurry that the air feed system of fluidization-suspension combustion system combustion chamber is communicated with the combustion chamber of fluidization-suspension combustion system
Pulp feeding system, described air feed system air intake vent arrange zeolite molecular sieve oxygen-enriching device, described through zeolite molecular sieve oxygen-enriching device
The air preheater heating through connecting for the low concentration oxygen-enriched air of preparation, after air preheater, respectively by with air
An oxygen-enriched hot-flow flue of preheater, oxygen-enriched second heat air channel and water-coal-slurry pelletizer are admitted to combustion chamber.
Described low concentration oxygen-enriched air passes through an oxygen-enriched hot-flow flue respectively and accesses fluid bed, by oxygen-enriched second heat air channel
Access combustion chamber emulsion zone, combustion chamber is accessed by water-coal-slurry pelletizer.
Described zeolite molecular sieve oxygen-enriching device include zeolite molecular sieve, filling zeolite molecular sieve tube bank, overcoat tube bank
Shell, described shell one end is communicated with the port of export of air blast, and the other end is communicated with air preheater；Described tube bank arranges many
The parallel pipe axially communicating, filling zeolite molecular sieve in the parallel pipe of overcoat tube bank, described tube bank be arranged in series two layers or
Multilayer, described tube bank two ends are radially arranged fixing orifice plate, and in described fixing orifice plate cooperation tube bank, parallel pipe is provided with through hole, described
The periphery of fixing orifice plate is matched with shell internal diameter, the outer affixed wire netting of described fixing orifice plate.
Described shell inlet port and outlet port are provided with block valve, and described block valve is furnished with adpting flange.
Described zeolite molecular sieve oxygen-enriching device is provided with two or more sets, in parallel between described zeolite molecular sieve oxygen-enriching device, institute
The shell stating zeolite molecular sieve oxygen-enriching device is passed through hot blast by hot-blast valve, and described shell is additionally provided with the vacuum arranging vacuum valve
Pump, and it is provided with vent valve and compressed air valve.
Described zeolite molecular sieve adopts lix type or liagx type zeolite molecular sieve.
Described shell internal diameter is 1.0～1.5 times of described blower export air channel diameter or equivalent diameter.
Described air feed system arranges zeolite molecular sieve oxygen-enriching device in its blower export, the oxygen-enriched dress of described zeolite molecular sieve
Put produced low concentration oxygen-enriched air after air preheater heating, by the oxygen-enriched hot-flow flue, oxygen-enriched secondary of setting
Hot-flow flue and water-coal-slurry are granulated the combustion chamber that hot-flow flue enters granulation suspension fired system, described low concentration oxygen-enriched air respectively with
Oxygen-enriched First air, oxygen-enriched Secondary Air, oxygen-enriched granulation wind enter combustion chamber bed area through an oxygen-enriched hot-flow flue, through oxygen-enriched second heat
Air channel entrance combustion chamber emulsion zone, the granulation airduct of the water-coal-slurry pelletizer through described water-coal-slurry pulp feeding system is same with water-coal-slurry
When enter combustion chamber dilute-phase zone.The high-temperature flue gas discharged from combustion chamber, through economizer, air preheater heat release, enter smoke evacuation and remove
Dirt system, removing dust device dedusting, air is entered by air-introduced machine.Boiler feedwater through deoxygenation heating enters boiler feedwater steam system
System, feed pump is passed through in boiler feedwater, feedwater piping enters economizer, after being preheated by economizer, enters through economizer exit water pipe
Enter drum, be heated to form steam subsequently into the evaporating heating surface in combustion chamber for the configuration, drawn by drum, complete kettleman
Make.
Methods and apparatus of the present invention has the advantage that one, adopts low concentration oxygen-enriched combusting, improves coal water slurry boiler
Catch fire and burning condition, reduce fuel ignition temperature, improve ignition temperature, burn rate and burn-off rate, improve fuel
The stability caught fire and burn；2nd, widened the accommodation to coal water slurry fuel for the coal water slurry boiler, you can relatively low to adapt to
The coal water slurry fuel that coal inferior is made mixes water-coal-slurry, mud coal slime mixing water coal slurry fuel it is also possible to adapt to sludge coal,
Not only to reduction fuel and production cost, there is great economic worth, and to improving environment, there is great social effect；
3rd, water-coal-slurry granulation wind is changed to oxygen-enriched hot air by traditional cold wind, improves combustion chambers burn temperature, decreases exhaust gas heat loss
Lose；4th, considerably reduce air total amount and the exhaust gas volumn entering combustion chamber, enter boiler total blast volume and reduce 20～40%, pot
Fire grate smoke reduces 20～25%, not only reduces heat loss due to exhaust gas, and reduces boiler blower and air-introduced machine two machine is total
Power consumption；5th, improve boiler combustion efficiency and the thermal efficiency, reduce boiler oil and consume 3～5%；6th, the row of reduce further
Flue dust in cigarette, nox, so2Content；7th, molecular sieve oxygen-enriching device, safe and reliable, easy to use, low production cost, oxygen-enriched system
Standby and regenerating molecular sieve power consumption is only 0.10kwh/m3[o2], only the 20% of Oxygen-Rich Gas by PSA, and it is far below boiler
Air blast and the decrement of the total power consumption of air-introduced machine two machine.
Accompanying drawing
Fig. 1 is the water-coal-slurry low concentration oxygen-enriched fluidisation suspension fired boiler apparatus structure schematic diagram of the present invention；
Fig. 2 is the zeolite molecular sieve oxygen-enriching device structural representation of the present invention.
Zeolite molecular sieve oxygen-enriching device 1；Regulating valve 2；Air blast 3；Oxygen-enriched cool air hose 4；Air preheater 5；Oxygen-enriched hot air
Header 6；An oxygen-enriched warm-air pipe 7；An oxygen-enriched hot-blast valve 8；Oxygen-enriched hot air case 9；Porous plate 10；Blast cap 11；Bed area 12；Stove
Wall 13；Combustion chamber 14；Combustion chamber emulsion zone 15；Combustion chamber dilute-phase zone 16；Oxygen-enriched second heat airduct 17；Oxygen-enriched second heat air-valve
18；Oxygen-enriched second heat air port 19；Oxygen-enriched granulation warm-air pipe 20；Oxygen-enriched granulation hot-blast valve 21；Pelletizer 22；Granulation airduct 23；For
Stock pump 24；Flow inlet 25；Granulating pipe 26；Chimney 27；Swirl separator 28；Feed back passage 29；Feed pump 30；Feedwater piping 31；
Economizer 32；Economizer exit water pipe 33；Drum 34；Evaporating heating surface 34；Deduster 36；Air-introduced machine 37；Shell 38；Fixing hole
Plate 39；Wire netting 40；Chimney 41；Tube bank 42；Zeolite molecular sieve 43；Entrance block valve 44；Outlet block valve 45；Vent valve 46；
Hot-blast valve 47；Compressed air valve 48；Vacuum valve 49；Vavuum pump 50；Adpting flange 51.
Embodiment
With reference to the accompanying drawings and examples methods and apparatus of the present invention is described in further detail.
As shown in Figure 1 and Figure 2,10 t/h fluidization-suspension combustion coal water slurry boilers are carried out, by traditional air
Combustion-supporting fluidization-suspension combustion coal water slurry boiler is changed to the fluidization-suspension combustion coal water slurry boiler of low concentration oxygen-enriched combustion-supporting.
A kind of water-coal-slurry low concentration oxygen-enriched fluidisation suspension fired boiler device, is provided with fluidization-suspension combustion system, this system
Including combustion chamber 14, the oxygen-enriched air feed system of low concentration that is attached to combustion chamber 14, and the water-coal-slurry being communicated with combustion chamber 14 supplied
Slurry system；Air blast 3 import of the oxygen-enriched air feed system of low concentration is configured with regulating valve 2, and air blast 3 port of export is configured with two groups simultaneously
The zeolite molecular sieve oxygen-enriching device 1 of row, zeolite molecular sieve oxygen-enriching device 1 arrival end is connected with the port of export of air blast 3, and air leads to
Overregulate valve 2, enter zeolite molecular sieve oxygen-enriching device 1 through air blast 3, zeolite molecular sieve oxygen-enriching device 1 port of export is pre- with air
Hot device 5 connects, and air generates the oxygen-enriched cold air of low concentration, low concentration oxygen-enriched cold air warp through zeolite molecular sieve oxygen-enriching device 1
Crossing after air preheater 5 is heated becomes the oxygen-enriched hot-air of low concentration, enters oxygen-enriched hot air header 6, connects from oxygen-enriched hot air header
Go out three arms and be referred to as an oxygen-enriched hot blast, oxygen-enriched secondary hot-air, the entrance burning of oxygen-enriched granulation hot blast by three arms
Room 14, wherein oxygen-enriched First air passes through an oxygen-enriched warm-air pipe 7 and configuration oxygen-enriched hot-blast valve 8 on oxygen-enriched hot air pipe 7,
Enter configuration combustion chamber 14 bottom and the oxygen-enriched hot air case 9 that connect with an oxygen-enriched warm-air pipe 7, then by configuring in richness
The porous plate 10 on oxygen hot bellows 9 top, blast cap 11, enter the bed area 12 of the fluid bed of combustion chamber bottom；Oxygen-enriched secondary hot-air
By the oxygen-enriched second heat airduct 17 and configuration oxygen-enriched second heat air-valve 18 on oxygen-enriched hot air pipe 17, then by with oxygen-enriched two
The oxygen-enriched second heat air port 19 of secondary warm-air pipe 17 connection, enters combustion chamber emulsion zone 15；Oxygen-enriched granulation hot blast passes through to be granulated hot blast
Pipe 20, then by the granulation airduct 23 with the pelletizer 22 being granulated the pulp feeding system that warm-air pipe connects, enters combustion chamber dilute phase
Area 16.
The above-mentioned water-coal-slurry pulp feeding system communicating with combustion chamber 14, water-coal-slurry by slurry supply pump 24, through flow inlet 25, by with
The granulating pipe 26 of the pelletizer 22 on combustion chamber 14 top for the configuration of flow inlet connection, enters combustion chamber dilute-phase zone 16, and above-mentioned
Met by the oxygen-enriched granulation hot blast that the granulation airduct 23 of pelletizer 22 enters combustion chamber 14, mix to be torn into and starch grain unrestrained combustion
Burn the bed area 12 of room 14, the oxygen-enriched hot blast being entered bed area blows afloat together with bed, with entrance combustion chamber 14
Oxygen-enriched secondary hot-air meets, and low concentration oxygen-enriched hot air includes an oxygen-enriched hot blast, oxygen-enriched secondary hot-air, oxygen-enriched granulation hot blast together
Be mixed to form the oxygen-enriched suspension combustion of low concentration with water-coal-slurry, meanwhile the lime stone in bed be heated and decomposed into calcium oxide with
Reaction of Salmon-Saxl in coal water slurry fuel generates calcium sulfate and completes desulfurization；The flue gas that burning generates is configured in combustion chamber 14 upper outlet
Smokestack 27 enter roto-clone separator 28, the fuel particle not burnt that flue gas carries and the limestone particle warp that unreacted completes
Roto-clone separator separates, and backs into the emulsion zone 15 of the 14 times tripes in combustion chamber by feeding back passage 29, forms the oxygen-enriched fluidisation of low concentration outstanding
Floating burning；Through the detached flue gas of roto-clone separator 28, pass sequentially through flue with the economizer 31 of combustion chamber 14 outlet and
The flue gas of the air preheater 5 of flue connection of economizer 31, flue-gas temperature is down to more than flue gas dew point, then sequentially enter with
The deduster 36 of the smoke discharging dust removing system that the flue of economizer 31 is connected with the flue of air preheater 5, air-introduced machine 37, chimney
41, enter air；Through deoxygenation heating after boiler feedwater, pressurize via feed pump 30, by be connected with economizer 31 to
Water pipe 31 enters economizer 31, by after the flue gas of economizer 31 flue, by the economizer connecting with economizer 31
Outlet water pipe 32, enters the drum 33 of boiler evaporating system, is then configured in combustion chamber 14 by be connected with drum
Evaporating heating surface tube bank 34, the high-temperature flue gas in burned room 14 are heated as steam, are drawn by drum 33, complete kettleman
Make.
It is configured with regulating valve 2 in air blast 3 entrance of air feed system, air blast 3 outlet is configured with arranged side by side two group zeolite
Molecular sieve oxygen-enriching device 1, zeolite molecular sieve oxygen-enriching device 1 includes the zeolite molecular sieve 43, tube bank 42 of filling zeolite molecules 43, outer
The cylindrical shell 38 of set tube bank 42, described shell 38 diameter and described air blast 3 outlet conduits diameter or the 1.0 of equivalent diameter
～1.5 times, shell 38 one end is communicated with the air outlet of air blast 3, and the other end is communicated with air preheater 5；Described tube bank 42 by
Many parallel pipe compositions, the total actual internal area of parallel pipe of tube bank 42 is equal with air blast 3 outlet airduct equivalent diameter, puts down
0.1 times of a diameter of shell of row pipe 38 diameter, the length of parallel pipe is 2.0 times of the diameter of shell 38, restrains 42 two ends
It is provided with the fixing orifice plate 39 of radial position, fixing orifice plate 39 faces cooperation at parallel pipe and is evenly equipped with multiple through holes, through hole
Aperture is identical with each parallel pipe external diameter, and the pore of fixing orifice plate 39 that the pipe of tube bank 42 designs by two ends is fixed, and restrains
The 42 total actual internal area of parallel pipe is not less than the 50% of shell actual internal area, in the Zhou Jing and shell 38 of fixing orifice plate 39
Footpath is equal, and tube bank 42 is matched with shell 38 inwall by the fixing orifice plate 39 at two ends, and tube bank 42 fixes 39 liang of orifice plate at two ends
End is configured with wire netting 40, and the aperture of wire netting 40 adopts 0.5～1.0mm, to guarantee the zeolite molecules in the pipe restrain 42
Sieve 43 does not leak, and clamps fixing orifice plate 39, in a shell 38, be provided with the two of series connection between wire netting 40 and tube bank 42
Layer or multilayer tube bank 42, adjacent two layers restrain 0.1～1.0 times that spacing distance is shell diameter, and zeolite molecular sieve adopts granularity
Lix type for 3.0～5.0mm or liagx type zeolite molecular sieve.Shell 38 inlet port and outlet port be each configured with into
Mouth block valve 44 and outlet block valve 45, wherein, two entrance block valve 44 entrance setting adpting flange 51 is exported even with air blast 3
Logical, the outlets of two outlet block valves 45 are arranged adpting flanges 51 and are connected with oxygen-enriched cool air hose 4, oxygen-enriched cool air hose and air preheater
5 entrance connections.
The shell 38 of zeolite molecular sieve oxygen-enriching device 1 is outer to arrange hot-blast valve, vent valve 46, compressed air valve 48, vavuum pump
49 and vacuum valve 50, wherein vacuum valve 50 is connected with vavuum pump 50, and hot-blast valve 48 connects with compressed air valve 49.
The adjusted valve of air 2 controls, and is pressurizeed by air blast 3, enters zeolite molecular sieve oxygen-enriching device 1, passes through the in advance
The wire netting of one layer of tube bank 42 entrance enters in pipe, and in the air part moisture and part nitrogen molecule are justified the boiling of casing pack
Stone molecular sieve 43 adsorbs, and leaves the wire netting of ground floor tube bank 42 outlet, then restrains the wire netting of 42 entrances by the second layer
Enter in pipe, the zeolite molecular sieve 43 that in the air part nitrogen molecule is justified casing pack adsorbs, leave second layer tube bank 42
The wire netting of outlet, eventually forms the low concentration oxygen-enriched air that oxygen volumetric concentration is 24～30%.
Zeolite molecular sieve oxygen-enriching device 1 has two groups to form side by side, and another group of regeneration of one group of operation is standby.When one group of zeolite divides
Son sieve oxygen-enriching device 1 runs, and the entrance block valve 44 of another group of zeolite molecular sieve oxygen-enriching device 1 and outlet block valve 45 are closed
Close.When needing zeolite molecular sieve is regenerated, open vent valve 46 and hot-blast valve 47, it is passed through 200 by hot-blast valve 47～
350 DEG C of Hot-blast Heating, opens after closing hot-blast valve 47,3～4 hours when vent valve 46 outlet air temperature reaches 100～150 DEG C
Open compressed air valve 48, be passed through pressure-air cooling, when vent valve 46 outlet wind-warm syndrome is down to room temperature, close compressed air valve 48
With vent valve 46, open vacuum valve 49, start vavuum pump 50, when in zeolite molecular sieve oxygen-enriching device 1 shell 38, vacuum pressure reaches
During to -50～-80kpa, stop vavuum pump 50, close vacuum valve 48.
The present invention traditional 10 tons/when fluidization-suspension combustion coal water slurry boiler on transformed, be changed to low concentration rich
Oxygen fluidization-suspension combustion coal water slurry boiler, and carried out low concentration oxygen-enriched fluidization-suspension combustion mode and the combustion-supporting mode of conventional air
Contrast test.Test water coal slurry fuel characteristic index is: water coal slurry concentration 63.1%；Additive 1.0%；Moisture content
wy35.9%；Fugitive constituent vy26.64%；Phosphorus content cy39.94%；Nitrogen content ny0.64%；Sulfur content sy0.62%；Ash
ay14.79；Lower heat value wy15.36mj/kg.Test oxygen-enriched air oxygen volumetric concentration is 28.Result of the test is as listed in table 2.Work
Industry test data is all the statistical value by 72 hours continuous operation results.Result of the test shows, the oxygen-enriched fluidisation of low concentration is outstanding
Floating combustion system mode combustion-supporting with conventional air compares: 1) because ignition temperature improves, quantity of steam, pressure, temperature have all carried
High: 2) efficiency of combustion improves 1.54 %；3) exhaust gas temperature have dropped 57.3 DEG C；4) boiler thermal output improves 6.16 %；5)
Fuel Consumption reduces 5.6%；6) blower air quantity decreases 33.3%, because air blast need to overcome zeolite oxygen-enriching device
Resistance, therefore blower power no increase and decrease；7) air-introduced machine exhaust smoke level decreases 20.0%, air-introduced machine power drop 25.5%；
8) smoke evacuation flue dust, nox, so2Concentration has all declined.Test data is as shown in table 1.
Table 1 10t/h low concentration oxygen-enriched fluidization-suspension combustion coal water slurry boiler result of the test
Those of ordinary skill in the art is it should be appreciated that above example is intended merely to illustrate rather than to this
Bright restriction, as long as within the scope of the invention, to the change of above example, deforms the protection model falling within the present invention
Enclose.
Claims (8)
1. a kind of oxygen-enriched fluidization-suspension combustion method of water-coal-slurry low concentration, takes water coal pulp fluidized suspension burning, oxygen-enriched combustion-supporting, its
Comprise the steps:
Step one: prepare low concentration oxygen-enriched air using zeolite molecular sieve；
Step 2: low concentration oxygen-enriched air is heated by air preheater；
Step 3: the low concentration oxygen-enriched air after air preheater heating, with oxygen-enriched First air, oxygen-enriched Secondary Air and oxygen-enriched
Granulation wind passes through fluid bed, overfiren air port and water-coal-slurry pelletizer respectively and enters combustion chamber, with the water-coal-slurry combustion entering combustion chamber
Material mixed combustion;
Wherein, step one using the zeolite molecular sieve oxygen-enriching device that zeolite molecular sieve prepares low concentration oxygen-enriched air be provided with two groups or
Multigroup, one group therein is used for preparing low concentration oxygen-enriched air, in this group zeolite molecular sieve adsorption saturation, closes this group zeolite
Molecular sieve oxygen-enriching device, is passed through 200-350 DEG C of hot blast, passes through vent valve discharge gas, in vent valve temperature of exhaust gas simultaneously
During for 100～150 DEG C, it is passed through pressure-air cooling to room temperature, by vavuum pump, zeolite molecular sieve is evacuated to -50～-
80kpa parsing regeneration；Open him simultaneously and organize zeolite molecular sieve oxygen-enriching device and prepare low concentration oxygen-enriched air.
2. the oxygen-enriched fluidization-suspension combustion method of water-coal-slurry low concentration as claimed in claim 1 it is characterised in that: by step one
The oxygen volumetric concentration of the low concentration oxygen-enriched air of preparation is 24～30%, the low concentration oxygen-enriched air total amount prepared by step one
The 60～80% of theoretical air requirement needed for coal water slurry fuel burning, low concentration oxygen-enriched air is heated to 200 by described step 2
～350 DEG C, then combustion chamber is accessed by air feed system, wherein entered by primary air nozzle, overfiren air port and water-coal-slurry pelletizer
The low concentration oxygen-enriched air entering combustion chamber accounts for 35～45%, 45～60% and the 5～10% of total amount respectively.
3. the boiler plant of a kind of method described in application any of the above-described claim, including fluidization-suspension combustion system, attached
Supply located at the water-coal-slurry that the air feed system of fluidization-suspension combustion system combustion chamber is communicated with the combustion chamber of fluidization-suspension combustion system
Slurry system it is characterised in that: described air feed system air intake vent arrange zeolite molecular sieve oxygen-enriching device, oxygen-enriched through zeolite molecular sieve
The air preheater heating through connecting for the low concentration oxygen-enriched air of device preparation, after air preheater, respectively by with
An oxygen-enriched hot-flow flue of air preheater, oxygen-enriched second heat air channel and water-coal-slurry pelletizer are admitted to combustion chamber, described zeolite
Molecular sieve oxygen-enriching device includes zeolite molecular sieve, the tube bank of filling zeolite molecular sieve, the shell of overcoat tube bank, described shell one end
Communicate with the port of export of air blast, the other end is communicated with air preheater；Described tube bank arranges the parallel circle that many axial directions communicate
Pipe, filling zeolite molecular sieve in the parallel pipe of overcoat tube bank, described tube bank is arranged in series two layers or multilayer, described tube bank two ends
Be radially arranged fixing orifice plate, in described fixing orifice plate cooperation tube bank, parallel pipe is provided with through hole, the periphery of described fixing orifice plate with
Shell internal diameter matches, the outer affixed wire netting of described fixing orifice plate.
4. boiler plant as claimed in claim 3 it is characterised in that: described low concentration oxygen-enriched air respectively pass through oxygen-enriched once
Hot-flow flue accesses fluid bed, by oxygen-enriched second heat air channel access combustion chamber emulsion zone, accesses burning by water-coal-slurry pelletizer
Room.
5. boiler plant as claimed in claim 3 it is characterised in that: described shell inlet port and outlet port are provided with and cut
Disconnected valve, described block valve is furnished with adpting flange.
6. boiler plant as claimed in claim 3 it is characterised in that: described zeolite molecular sieve oxygen-enriching device is provided with two groups or many
Group, in parallel between described zeolite molecular sieve oxygen-enriching device, the shell of described zeolite molecular sieve oxygen-enriching device is passed through heat by hot-blast valve
Wind, described shell is additionally provided with the vavuum pump arranging vacuum valve, and is provided with vent valve and compressed air valve.
7. boiler plant as claimed in claim 3 it is characterised in that: described zeolite molecular sieve adopt lix type or liagx type boiling
Stone molecular sieve.
8. boiler plant as claimed in claim 3, described shell internal diameter is described blower export air channel diameter or equivalent is straight
1.0～1.5 times of footpath.
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| CN105757651B (en) * | 2016-04-11 | 2018-05-11 | 华中科技大学 | A kind of water-coal-slurry nonflame oxygen-enriched combustion system |
| CN105910098A (en) * | 2016-04-11 | 2016-08-31 | 华中科技大学 | Coal water slurry oxygen-rich combustion system |
| CN106509968A (en) * | 2016-11-29 | 2017-03-22 | 黄俊柳 | Tobacco curing stove achieving secondary combustion |
| CN108916867A (en) * | 2018-09-06 | 2018-11-30 | 青岛特利尔环保股份有限公司 | A kind of ciculation fluidized burning boiler low nitrogen burning technique |
Citations (4)
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|---|---|---|---|---|
| CN1459583A (en) * | 2002-05-23 | 2003-12-03 | 姜秀民 | Water coal pulp fluidized suspension high effect cleaning combustion technology |
| CN1959208A (en) * | 2006-11-09 | 2007-05-09 | 华中科技大学 | Boiler system of circulating fluid bed burning in oxygen enrichment |
| CN201429074Y (en) * | 2009-06-11 | 2010-03-24 | 青岛特利尔水煤浆锅炉有限公司 | Improved coal water slurry circulating fluidization-suspension combustion apparatus |
| CN102494334A (en) * | 2011-12-22 | 2012-06-13 | 上海锅炉厂有限公司 | Coal powder combustion system used in high-moisture type coal oxygen-enriched combustion |
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2014
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1459583A (en) * | 2002-05-23 | 2003-12-03 | 姜秀民 | Water coal pulp fluidized suspension high effect cleaning combustion technology |
| CN1959208A (en) * | 2006-11-09 | 2007-05-09 | 华中科技大学 | Boiler system of circulating fluid bed burning in oxygen enrichment |
| CN201429074Y (en) * | 2009-06-11 | 2010-03-24 | 青岛特利尔水煤浆锅炉有限公司 | Improved coal water slurry circulating fluidization-suspension combustion apparatus |
| CN102494334A (en) * | 2011-12-22 | 2012-06-13 | 上海锅炉厂有限公司 | Coal powder combustion system used in high-moisture type coal oxygen-enriched combustion |
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