CN104197321A - 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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- CN104197321A CN104197321A CN201410355011.1A CN201410355011A CN104197321A CN 104197321 A CN104197321 A CN 104197321A CN 201410355011 A CN201410355011 A CN 201410355011A CN 104197321 A CN104197321 A CN 104197321A
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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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- 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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- Y02P20/00—Technologies relating to chemical industry
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- 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, be specifically related to a kind of water-coal-slurry low concentration oxygen enrichment fluidization-suspension combustion mode and boiler plant thereof.
Background technology
Water coal slurry combusting technology is called as the clean combustion technology of coal, and China carries out coal water slurry boiler experimental study since the seventies in last century, over 40 years, has obtained significant progress.At present, coal water slurry boiler is divided into two kinds of fluidization-suspension combustion and atomization suspension combustions.Water coal pulp fluidized suspension combustion system is compared and is had many advantages with atomization suspension combustion mode, as realize low-temperature burning, solve a global difficult problem for the easy coking of coal water slurry boiler, generation and the discharge etc. of NOx have been suppressed simultaneously, therefore CWS Fluid-suspension Combustion Technology is in field of boilers, especially obtain a wide range of applications in medium and small boiler field, be called as a revolution in water coal slurry combusting technology field.But water coal pulp fluidized suspension combustion system remains wide in range not to the adaptability of coal water slurry fuel, especially, to mixing the bad adaptability of coal water slurry fuel of colm, there is the shortcomings such as combustion instability, incomplete combustion of catching fire.
Traditional coal-water-slurry boiler is the same with other Industrial Boiler or stove, fuel combustion adopts air to carry out combustion-supporting, since the eighties in last century, oxygen-enriched combusting is as a kind of power-saving technology, on coal-burned industrial boiler or station boiler, adopt oxygen-enriched local combustion supporting technology, have the bibliographical information of opinion, to reduce fuel ignition temperature, improve ignition temperature, improve combustion stability, reduce fuel consumption and have good effect, but brought increasing considerably of NOx.And to so far, on industrial furnace, have and adopt the test higher than 50% oxygenized air combustion supporting of volume percent oxygen concentration, the oxygen-enriched air preparation method adopting is also to generally acknowledge at present the film oxygen enrichment mode and the pressure-variable adsorption mode that on Industrial Boiler and industrial furnace, have application future most.So, someone attempts to adopt the mode of oxygen-enriched combustion-supporting on coal water slurry boiler, as publication number be 200410096627.8 the patent of invention of " water-coal-slurry large space burning mode and special equipment thereof ", this patent of invention proposes to adopt oxygen concentration expressed in percentage by volume to carry out combustion-supporting higher than 50% oxygen-enriched air for water-coal-slurry atomization suspension combustion mode, and adopt change absorption type device to produce oxygen-enriched air, thereby there are following shortcomings and limitations: 1) excessive concentrations oxygen-enriched combustion-supporting has increased generation and the discharge thereof of heating power NOx; 2) only limit to water-coal-slurry atomization suspension combustion mode; 3) become absorption type oxygen-enriching device equipment complexity, energy consumption is too high, reaches 0.4～0.55kWh/m
3[O
2], for example use 1 ton of water-coal-slurry and approximately need to consume 500～600kWh electric energy, even if adopt film oxygen enrichment mode power consumption also suitable therewith, obviously lose more than gain.
Summary 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 wide in range not, burning stable not, high concentration oxygen-enriched combustion-supporting exists again NOx to generate discharge increase, oxygen enrichment Preparation equipment complexity, energy consumption is too high and cost is higher shortcoming, and the present invention proposes a kind of water-coal-slurry low concentration oxygen enrichment fluidization-suspension combustion method and boiler plant thereof.
The problem existing for solving prior art; the present invention adopts following technical scheme: by traditional fluidization-suspension combustion coal water slurry boiler device; change low concentration oxygen enrichment granulation suspension combustion coal water slurry boiler device into, take water coal pulp fluidized suspension burning, oxygen-enriched combustion-supporting, it comprises the steps:
Step 1: utilize zeolite molecular sieve to prepare low concentration oxygen-enriched air;
Step 2: heat low concentration oxygen-enriched air by air preheater;
Step 3: the low concentration oxygen-enriched air after air preheater heating; enter combustion chamber by fluid bed, overfiren air port and water-coal-slurry pelletizer respectively with wind of oxygen enrichment, oxygen enrichment Secondary Air and oxygen enrichment granulation wind, with the coal water slurry fuel mixed combustion that enters combustion chamber.
The oxysome volume concentrations of the low concentration oxygen-enriched air of preparing by step 1 is 24～30%; the low concentration oxygen-enriched air total amount of preparing by step 1 is coal water slurry fuel 60～80% of the required theoretical air requirement that burns; low concentration oxygen-enriched air is heated to 200～350 DEG C by described step 2; then access combustion chamber by air feed system, the low concentration oxygen-enriched air that wherein enters combustion chamber by primary air nozzle, overfiren air port and water-coal-slurry pelletizer accounts for respectively 35～45%, 45～60% and 5～10% of total amount.
The zeolite molecular sieve oxygen-enriching device that step 1 utilizes zeolite molecular sieve to prepare low concentration oxygen-enriched air is provided with two groups or many groups, wherein one group for the preparation of low concentration oxygen-enriched air, adsorb when saturated at this group zeolite molecular sieve, close this group zeolite molecular sieve oxygen-enriching device, pass into 200-350 DEG C of hot blast, simultaneously by vent valve emission gases, in the time that vent valve temperature of exhaust gas is 100～150 DEG C, pass into pressure-air cooling to room temperature, zeolite molecular sieve is evacuated to-50～-80kPa by vavuum pump and resolves regeneration; Open him organizes zeolite molecular sieve oxygen-enriching device and prepares low concentration oxygen-enriched air simultaneously.
A kind of boiler plant of applying the method described in above-mentioned any one claim, comprise fluidization-suspension combustion system, be attached to the air feed system of fluidization-suspension combustion system combustion chamber, the water-coal-slurry pulp feeding system communicating with the combustion chamber of fluidization-suspension combustion system, described air feed system arranges zeolite molecular sieve oxygen-enriching device at air intake vent, the air preheater heating of the described low concentration oxygen-enriched air of preparing through zeolite molecular sieve oxygen-enriching device through connecting, passing through after air preheater, respectively by with hot-flow flue of oxygen enrichment of air preheater, oxygen enrichment second heat air channel and water-coal-slurry pelletizer are admitted to combustion chamber.
Described low concentration oxygen-enriched air is respectively by hot-flow flue access fluid bed of oxygen enrichment, by access combustion chamber, oxygen enrichment second heat air channel emulsion zone, by water-coal-slurry pelletizer access combustion chamber.
Described zeolite molecular sieve oxygen-enriching device comprises the shell of zeolite molecular sieve, the tube bank of filling zeolite molecular sieve, overcoat tube bank, and described shell one end communicates with the port of export of air blast, and the other end communicates with air preheater; Described tube bank arranges the many parallel pipes that axially communicate, in the parallel pipe of overcoat tube bank, fill zeolite molecular sieve, described tube bank series connection arranges two layers or multilayer, described tube bank two ends radially arrange fixing orifice plate, described fixing orifice plate coordinates parallel pipe in tube bank to be provided with through hole, the periphery of described fixing orifice plate and shell internal diameter match, the outer affixed wire netting of described fixing orifice plate.
Described shell air inlet end and gas outlet end 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, the shell of described zeolite molecular sieve oxygen-enriching device passes into hot blast by hot-blast valve, and described shell is also provided with the vavuum pump that arranges vacuum valve, and 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 described blower export air channel diameter or equivalent diameter 1.0～1.5 times.
Described air feed system arranges zeolite molecular sieve oxygen-enriching device at its blower export, the low concentration oxygen-enriched air that described zeolite molecular sieve oxygen-enriching device produces is after air preheater heating, by the hot-flow flue of oxygen enrichment arranging, oxygen enrichment second heat air channel and water-coal-slurry granulation hot-flow flue enter the combustion chamber of granulation suspension combustion system, described low concentration oxygen-enriched air is respectively with wind of oxygen enrichment, oxygen enrichment Secondary Air, oxygen enrichment granulation wind enters Chuan Liao district, combustion chamber through hot-flow flue of oxygen enrichment, enter combustion chamber emulsion zone through oxygen enrichment second heat air channel, granulation airduct and water-coal-slurry through the water-coal-slurry pelletizer of described water-coal-slurry pulp feeding system enter combustion chamber dilute-phase zone simultaneously.The high-temperature flue gas of discharging from combustion chamber, through economizer, air preheater heat release, enters smoke discharging dust removing system, through deduster dedusting, enters atmosphere by air-introduced machine.Boiler feedwater through deoxygenation heating enters boiler feedwater vapour system, boiler feedwater enters economizer by feed pump, feedwater piping, after economizer preheating, enter drum through economizer exit water pipe, then enter the evaporating heating surface that is configured in combustion chamber and be heated to form steam, draw by drum, complete boiler work.
Method and apparatus of the present invention has the following advantages: one, adopt low concentration oxygen-enriched combusting, improve that coal water slurry boiler catches fire and burning condition, reduce fuel fire temperature, improved ignition temperature, burn rate and burn-off rate, improved the stability of fuel fire and burning; Two, widened the accommodation of coal water slurry boiler to coal water slurry fuel, can adapt to the coal water slurry fuel that the coal of lower poor quality is made, also can adapt to mud ﹣ coal mixing water coal slurry, mud ﹣ coal slime mixing water coal slurry fuel, not only there is great economic worth to reducing fuel and production cost, and there is great social effect to improving environment; Three, water-coal-slurry granulation changes oxygen-enriched hot air with wind into by traditional cold wind, has improved combustion chambers burn temperature, has reduced heat loss due to exhaust gas; Four, significantly reduced the air total amount and the exhaust gas volumn that enter combustion chamber, entered boiler total blast volume and reduce 20～40%, boiler exhaust gas amount reduces 20～25%, has not only reduced heat loss due to exhaust gas, and has reduced boiler blower and the total power consumption of air-introduced machine two machines; Five, improved boiler combustion efficiency and the thermal efficiency, reduced boiler oil and consume 3～5%; Six, further reduced flue dust, NOx, the SO in smoke evacuation
2content; Seven, molecular sieve oxygen-enriching device, safe and reliable, easy to use, and production cost is low, and oxygen enrichment preparation and regenerating molecular sieve power consumption are only 0.10kWh/m
3[O
2], only have 20% of Oxygen-Rich Gas by PSA, and far below the reduction of boiler blower and the total power consumption of air-introduced machine two machine.
accompanying drawing
Fig. 1 is water-coal-slurry low concentration oxygen enrichment fluidisation suspension fired boiler apparatus structure schematic diagram of the present invention;
Fig. 2 is zeolite molecular sieve oxygen-enriching device structural representation of the present invention.
Zeolite molecular sieve oxygen-enriching device 1; Control valve 2; Air blast 3; Oxygen enrichment cool air hose 4; Air preheater 5; Oxygen-enriched hot air header 6; Warm-air pipe 7 of oxygen enrichment; Hot-blast valve 8 of oxygen enrichment; Oxygen-enriched hot air case 9; Porous plate 10; Blast cap 11; Chuan Liao district 12; Furnace wall 13; Combustion chamber 14; Combustion chamber emulsion zone 15; Combustion chamber dilute-phase zone 16; Oxygen enrichment second heat airduct 17; Oxygen enrichment second heat air-valve 18; Oxygen enrichment second heat air port 19; Oxygen enrichment granulation warm-air pipe 20; Oxygen enrichment granulation hot-blast valve 21; Pelletizer 22; Granulation airduct 23; Slurry supply 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 orifice 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
Below in conjunction with drawings and Examples, method and apparatus of the present invention is described in further detail.
As shown in Figure 1 and Figure 2, on 10 t/h fluidization-suspension combustion coal water slurry boilers, implement, traditional air-breathing fluidization-suspension combustion coal water slurry boiler is changed into the fluidization-suspension combustion coal water slurry boiler of low concentration oxygen-enriched combustion-supporting.
A kind of water-coal-slurry low concentration oxygen enrichment fluidisation suspension fired boiler device, is provided with fluidization-suspension combustion system, and this system comprises combustion chamber 14, is attached to the low concentration oxygen enrichment air feed system of combustion chamber 14, and the water-coal-slurry pulp feeding system communicating with combustion chamber 14, control valve 2 is disposed in air blast 3 imports of low concentration oxygen enrichment air feed system, air blast 3 ports of export dispose two groups of zeolite molecular sieve oxygen-enriching devices 1 arranged side by side, zeolite molecular sieve oxygen-enriching device 1 arrival end is communicated with the port of export of air blast 3, air is by control 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 communicated with air preheater 5, air generates low concentration oxygen enrichment cold air through zeolite molecular sieve oxygen-enriching device 1, low concentration oxygen enrichment cold air becomes low concentration oxygen enrichment hot-air after air preheater 5 is heated, enter oxygen-enriched hot air header 6, pick out three arms and be called as hot blast of oxygen enrichment by three arms from oxygen-enriched hot air header, oxygen enrichment secondary hot-air, oxygen enrichment granulation hot blast enters combustion chamber 14, wherein wind of oxygen enrichment is by warm-air pipe of oxygen enrichment 7 be configured in the hot-blast valve 8 of oxygen enrichment on oxygen-enriched hot air pipe 7, enter and be configured in oxygen-enriched hot air case 9 14 bottoms, combustion chamber and that be communicated with warm-air pipe 7 of oxygen enrichment, then by being configured in the porous plate 10 on oxygen-enriched hot air case 9 tops, blast cap 11, enter the fluid bed Chuan Liao district 12 of bottom, combustion chamber, oxygen enrichment secondary hot-air is by oxygen enrichment second heat airduct 17 and be configured in the oxygen enrichment second heat air-valve 18 on oxygen-enriched hot air pipe 17, then, by the oxygen enrichment second heat air port 19 being communicated with oxygen enrichment second heat airduct 17, enters combustion chamber emulsion zone 15, oxygen enrichment granulation hot blast is by granulation warm-air pipe 20, and then the granulation airduct 23 of the pelletizer 22 by the pulp feeding system that is communicated with granulation warm-air pipe, enters combustion chamber dilute-phase zone 16.
The above-mentioned water-coal-slurry pulp feeding system communicating with combustion chamber 14, water-coal-slurry is by slurry supply pump 24, through flow inlet 25, by the granulating pipe 26 of the pelletizer 22 that is configured in 14 tops, combustion chamber that is communicated with flow inlet, enter combustion chamber dilute-phase zone 16, the oxygen enrichment granulation hot blast that enters combustion chamber 14 with the above-mentioned granulation airduct 23 by pelletizer 22 meets, mix and be torn into slurry grain 14Chuan Liao district, unrestrained combustion chamber 12, the hot blast of oxygen enrichment that is entered Chuan Liao district blows afloat together with bed material, meet with the oxygen enrichment secondary hot-air that enters combustion chamber 14, low concentration oxygen-enriched hot air comprises hot blast of oxygen enrichment, oxygen enrichment secondary hot-air, oxygen enrichment granulation hot blast is mixed to form low concentration oxygen enrichment suspension combustion with water-coal-slurry together, the reaction of Salmon-Saxl generation calcium sulfate that meanwhile lime stone in bed material is heated and decomposed in calcium oxide and coal water slurry fuel completes desulfurization, the flue gas that burning generates is configured in the smokestack 27 of combustion chamber 14 top outlets and enters roto-clone separator 28, the limestone particle that the fuel particle not burning that flue gas carries and unreacted complete separates through roto-clone separator, enter the emulsion zone 15 of the 14 times tripes in combustion chamber by feeding back passage for 29 times, form low concentration oxygen enrichment fluidization-suspension combustion, the flue gas separating through roto-clone separator 28, the flue gas of the air preheater 5 by exporting the flue of the economizer 31 being communicated with combustion chamber 14, be communicated with the flue of economizer 31 successively, more than flue-gas temperature is down to flue gas dew point, then the deduster 36, air-introduced machine 37, the chimney 41 that enter successively the smoke discharging dust removing system being connected with the flue of economizer 31 and the flue of air preheater 5, enter atmosphere, boiler feedwater after deoxygenation heating, pressurize via feed pump 30, enter economizer 31 by the feed pipe 31 being connected with economizer 31, be passed after the flue gas of economizer 31 flues, by the economizer exit water pipe 32 being communicated with economizer 31, enter the drum 33 of boiler evaporating system, then by the evaporating heating surface tube bank 34 in combustion chamber 14 that is configured in being connected with drum, high-temperature flue gas in burned chamber 14 is heated as steam, is drawn by drum 33, completes boiler work.
Air blast 3 entrances at air feed system dispose control valve 2, two groups of zeolite molecular sieve oxygen-enriching devices 1 arranged side by side are disposed in air blast 3 outlets, zeolite molecular sieve oxygen-enriching device 1 comprises the cylindrical shell 38 of zeolite molecular sieve 43, the tube bank 42 of filling zeolite molecules 43, overcoat tube bank 42, described shell 38 diameters and described air blast 3 export air channel diameter or equivalent diameter 1.0～1.5 times, shell 38 one end communicate with the air outlet of air blast 3, and the other end communicates with air preheater 5, described tube bank 42 is made up of many parallel pipes, the total actual internal area of parallel pipe of tube bank 42 exports airduct equivalent diameter with air blast 3 and equates, parallel pipe diameter is 0.1 times of shell 38 diameters, the length of parallel pipe is 2.0 times of diameter of shell 38, restrain 42 two ends and be provided with the fixing orifice plate 39 of radial position, fixing orifice plate 39 faces the cooperation of parallel pipe place and is evenly equipped with multiple through holes, through-hole aperture is identical with each parallel pipe external diameter, the pore of the fixing orifice plate 39 that the pipe of tube bank 42 designs by two ends is fixed, the total actual internal area of parallel pipe of tube bank 42 is not less than 50% of shell actual internal area, the Zhou Jing of fixing orifice plate 39 equates with shell 38 internal diameters, the tube bank 42 fixing orifice plates 39 by two ends match with shell 38 inwalls, at two ends, fixing orifice plate 39 two ends dispose wire netting 40 in tube bank 42, the aperture of wire netting 40 adopts 0.5～1.0mm, do not leak with the zeolite molecular sieve 43 of guaranteeing to restrain in 42 pipe, between wire netting 40 and tube bank 42, clamp fixing orifice plate 39, in a shell 38, be provided with the two-layer or multilayer tube bank 42 of series connection, adjacent two layers tube bank spacing distance is 0.1～1.0 times of shell diameter, zeolite molecular sieve adopts LIX type or the LiAgx type zeolite molecular sieve that granularity is 3.0～5.0mm.Shell 38 disposes respectively entrance block valve 44 and outlet block valve 45 at air inlet end and gas outlet end, wherein, two entrance block valve 44 entrances arrange adpting flange 51 and are communicated with air blast 3 outlets, the outlet of two outlet block valves 45 arranges adpting flange 51 and is communicated with oxygen enrichment cool air hose 4, and oxygen enrichment cool air hose is communicated with air preheater 5 entrances.
Outside the shell 38 of zeolite molecular sieve oxygen-enriching device 1, arrange hot-blast valve, vent valve 46, compressed air valve 48, vavuum pump 49 and vacuum valve 50, wherein vacuum valve 50 is communicated with vavuum pump 50, and hot-blast valve 48 and compressed air valve 49 are communicated with.
Air is controlled through control valve 2, pressurize by air blast 3, enter zeolite molecular sieve oxygen-enriching device 1, the wire netting of restraining 42 entrances by ground floor in advance enters in pipe, the zeolite molecular sieve 43 that in air, part moisture and part nitrogen molecule are justified casing pack adsorbs, leave the wire netting of ground floor tube bank 42 outlets, the wire netting of then restraining 42 entrances by the second layer enters in pipe, the zeolite molecular sieve 43 that in air, part nitrogen molecule is justified casing pack adsorbs, leave the wire netting of second layer tube bank 42 outlets, finally form oxysome volume concentrations and be 24～30% low concentration oxygen-enriched air.
Zeolite molecular sieve oxygen-enriching device 1 has two groups to form side by side, and one group is moved another group and regenerates for subsequent use.When one group of zeolite molecular sieve oxygen-enriching device 1 moves, the entrance block valve 44 of another group zeolite molecular sieve oxygen-enriching device 1 and outlet block valve 45 are closed.In the time that needs are regenerated to zeolite molecular sieve, open vent valve 46 and hot-blast valve 47, pass into the Hot-blast Heating of 200～350 DEG C by hot-blast valve 47, when exporting, vent valve 46 when air temperature reaches 100～150 DEG C, closes hot-blast valve 47, after 3～4 hours, open compressed air valve 48, pass into pressure-air cooling, in the time that vent valve 46 exports wind-warm syndrome and is down to room temperature, closes compression air valve 48 and vent valve 46, open vacuum valve 49, start vavuum pump 50, in the time that the interior vacuum pressure of zeolite molecular sieve oxygen-enriching device 1 shell 38 reaches-50～-80kPa, stop vavuum pump 50, close vacuum valve 48.
The present invention transformed on fluidization-suspension combustion coal water slurry boiler, changes low concentration oxygen enrichment fluidization-suspension combustion coal water slurry boiler into, and carried out the contrast test of low concentration oxygen enrichment fluidization-suspension combustion mode and the combustion-supporting mode of conventional air traditional 10 tons/time.Test water coal slurry fuel characteristic index is: water coal slurry concentration 63.1%; Additive 1.0%; Moisture content W
y35.9%; Fugitive constituent V
y26.64%; Phosphorus content C
y39.94%; Content
y0.64%; Sulfur content S
y0.62%; Ash A
y14.79; Lower heat value W
y15.36MJ/kg.Test oxygen-enriched air oxysome volume concentrations is 28 ﹪.Result of the test is as listed in table 2.Type approval test data are all by the statistical value of 72 hours continuous operation results.Result of the test shows, the combustion-supporting mode comparison of low concentration oxygen enrichment fluidization-suspension combustion mode and conventional air: 1), because ignition temperature improves, quantity of steam, pressure, temperature all increase: 2) efficiency of combustion has improved 1.54 %; 3) exhaust gas temperature has declined 57.3 DEG C; 4) boiler thermal output has improved 6.16 %; 5) Fuel Consumption has reduced by 5.6%; 6) blower air quantity has reduced 33.3%, and because air blast need overcome the resistance of zeolite oxygen-enriching device, therefore blower power is without increase and decrease; 7) air-introduced machine exhaust smoke level has reduced 20.0%, and air-introduced machine power has declined 25.5%; 8) smoke evacuation flue dust, NOx, SO
2concentration all declines to some extent.Test data is as shown in table 1.
table 1 10t/h low concentration oxygen enrichment fluidization-suspension combustion coal water slurry boiler result of the test
Those of ordinary skill in the art will be appreciated that, above embodiment is only for the present invention being described but not limitation of the invention, as long as within the scope of the invention, variation, distortion to above embodiment all will fall into protection scope of the present invention.
Claims (10)
1. a water-coal-slurry low concentration oxygen enrichment fluidization-suspension combustion method, takes water coal pulp fluidized suspension burning, oxygen-enriched combustion-supporting, and it comprises the steps:
Step 1: utilize zeolite molecular sieve to prepare low concentration oxygen-enriched air;
Step 2: heat low concentration oxygen-enriched air by air preheater;
Step 3: the low concentration oxygen-enriched air after air preheater heating; enter combustion chamber by fluid bed, overfiren air port and water-coal-slurry pelletizer respectively with wind of oxygen enrichment, oxygen enrichment Secondary Air and oxygen enrichment granulation wind, with the coal water slurry fuel mixed combustion that enters combustion chamber.
2. water-coal-slurry low concentration oxygen enrichment fluidization-suspension combustion method as claimed in claim 1, it is characterized in that: the oxysome volume concentrations of the low concentration oxygen-enriched air of preparing by step 1 is 24～30%, the low concentration oxygen-enriched air total amount of preparing by step 1 is coal water slurry fuel 60～80% of the required theoretical air requirement that burns, low concentration oxygen-enriched air is heated to 200～350 DEG C by described step 2, then access combustion chamber by air feed system, wherein pass through primary air nozzle, the low concentration oxygen-enriched air that overfiren air port and water-coal-slurry pelletizer enter combustion chamber accounts for respectively 35～45% of total amount, 45～60% and 5～10%.
3. the water-coal-slurry low concentration oxygen enrichment fluidization-suspension combustion method as described in claims 1 or 2, it is characterized in that: the zeolite molecular sieve oxygen-enriching device that step 1 utilizes zeolite molecular sieve to prepare low concentration oxygen-enriched air is provided with two groups or many groups, wherein one group for the preparation of low concentration oxygen-enriched air, adsorb when saturated at this group zeolite molecular sieve, close this group zeolite molecular sieve oxygen-enriching device, pass into 200-350 DEG C of hot blast, simultaneously by vent valve emission gases, in the time that vent valve temperature of exhaust gas is 100～150 DEG C, pass into pressure-air cooling to room temperature, zeolite molecular sieve is evacuated to-50～-80kPa by vavuum pump and resolves regeneration, open him organizes zeolite molecular sieve oxygen-enriching device and prepares low concentration oxygen-enriched air simultaneously.
4. the boiler plant of the method described in the above-mentioned any one claim of application, comprise fluidization-suspension combustion system, be attached to the air feed system of fluidization-suspension combustion system combustion chamber, the water-coal-slurry pulp feeding system communicating with the combustion chamber of fluidization-suspension combustion system, it is characterized in that: described air feed system arranges zeolite molecular sieve oxygen-enriching device at air intake vent, the air preheater heating of the described low concentration oxygen-enriched air of preparing through zeolite molecular sieve oxygen-enriching device through connecting, passing through after air preheater, respectively by with hot-flow flue of oxygen enrichment of air preheater, oxygen enrichment second heat air channel and water-coal-slurry pelletizer are admitted to combustion chamber.
5. boiler plant as claimed in claim 4, is characterized in that: described low concentration oxygen-enriched air is respectively by hot-flow flue access fluid bed of oxygen enrichment, by access combustion chamber, oxygen enrichment second heat air channel emulsion zone, by water-coal-slurry pelletizer access combustion chamber.
6. boiler plant as claimed in claim 4, it is characterized in that: described zeolite molecular sieve oxygen-enriching device comprises the shell of zeolite molecular sieve, the tube bank of filling zeolite molecular sieve, overcoat tube bank, described shell one end communicates with the port of export of air blast, and the other end communicates with air preheater; Described tube bank arranges the many parallel pipes that axially communicate, in the parallel pipe of overcoat tube bank, fill zeolite molecular sieve, described tube bank series connection arranges two layers or multilayer, described tube bank two ends radially arrange fixing orifice plate, described fixing orifice plate coordinates parallel pipe in tube bank to be provided with through hole, the periphery of described fixing orifice plate and shell internal diameter match, the outer affixed wire netting of described fixing orifice plate.
7. boiler plant as claimed in claim 6, is characterized in that: described shell air inlet end and gas outlet end are provided with block valve, and described block valve is furnished with adpting flange.
8. boiler plant as claimed in claim 6, it is characterized in that: described zeolite molecular sieve oxygen-enriching device is provided with two or more sets, in parallel between described zeolite molecular sieve oxygen-enriching device, the shell of described zeolite molecular sieve oxygen-enriching device passes into hot blast by hot-blast valve, described shell is also provided with the vavuum pump that arranges vacuum valve, and is provided with vent valve and compressed air valve.
9. boiler plant as claimed in claim 6, is characterized in that: described zeolite molecular sieve adopts LIX type or LiAgx type zeolite molecular sieve.
10. boiler plant as claimed in claim 6, is characterized in that: described shell internal diameter is described blower export air channel diameter or equivalent diameter 1.0～1.5 times.
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| CN201410355011.1A CN104197321B (en) | 2014-07-24 | 2014-07-24 | Coal water slurry low-concentration oxygen enrichment fluidization suspension combustion method and boiler device thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105757651A (en) * | 2016-04-11 | 2016-07-13 | 华中科技大学 | Coal water slurry flame-free 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 |
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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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| 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 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105757651A (en) * | 2016-04-11 | 2016-07-13 | 华中科技大学 | Coal water slurry flame-free 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 |
| 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 |
| 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 |
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| CN104197321B (en) | 2017-01-25 |
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