CN204962733U - Oxygen -enriched combustion system - Google Patents
Oxygen -enriched combustion system Download PDFInfo
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- CN204962733U CN204962733U CN201520753680.4U CN201520753680U CN204962733U CN 204962733 U CN204962733 U CN 204962733U CN 201520753680 U CN201520753680 U CN 201520753680U CN 204962733 U CN204962733 U CN 204962733U
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- oxygen
- coal pulverizer
- combustion system
- enriched combustion
- pipeline
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- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 159
- 239000001301 oxygen Substances 0.000 title claims abstract description 159
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 145
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 80
- 239000003245 coal Substances 0.000 claims abstract description 146
- 239000007789 gas Substances 0.000 claims abstract description 103
- 239000003595 mist Substances 0.000 claims abstract description 42
- 150000002926 oxygen Chemical class 0.000 claims abstract description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 89
- 239000003546 flue gas Substances 0.000 claims description 84
- 238000011049 filling Methods 0.000 claims description 28
- 239000003517 fume Substances 0.000 claims description 26
- 238000012545 processing Methods 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 20
- 230000002378 acidificating effect Effects 0.000 claims description 17
- 239000002817 coal dust Substances 0.000 claims description 16
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 238000000746 purification Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 20
- 230000002269 spontaneous effect Effects 0.000 abstract description 15
- 238000007664 blowing Methods 0.000 abstract description 2
- 239000002253 acid Substances 0.000 abstract 2
- 238000005474 detonation Methods 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 16
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 15
- 238000005260 corrosion Methods 0.000 description 13
- 230000007797 corrosion Effects 0.000 description 12
- 229910002092 carbon dioxide Inorganic materials 0.000 description 8
- 239000001569 carbon dioxide Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000003077 lignite Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- -1 now Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000010792 warming Methods 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
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Abstract
The utility model relates to an oxygen boosting burning field discloses an oxygen -enriched combustion system, and this oxygen -enriched combustion system includes boiler (101) and coal pulverizer (104), the entry of boiler (101) with the export intercommunication of coal pulverizer (104), oxygen -enriched combustion system sets up and does: make and get into the temperature of the mist in coal pulverizer (104) is higher than coal pulverizer (104) interior acid gas's dewfall temperature, make and get into oxygen concentration in the mist in coal pulverizer (104) is less than and arouses in mist oxygen concentration's critical value when buggy and/or combustible gas detonation in coal pulverizer (104). The utility model provides an oxygen -enriched combustion system not only can prevent that acid gas dewfall is corroded in coal pulverizer (104), can prevent that coal pulverizer (104) spontaneous combustion of [pulver ized] coal's problem appears at the blowing out in -process simultaneously effectively, has improved the security of equipment operation, has prolonged the life of equipment.
Description
Technical field
The utility model relates to oxygen-enriched combustion technology, particularly, relates to a kind of oxygen-enriched combustion system.
Background technology
Along with the development of human industry, climate change problem has caused the concern in the whole world, although also there is different arguements to the reason of climate warming at present, theory thinks that it raises relevant with the GHG carbon dioxide that mankind's activity produces (CO2) concentration mostly.Just because of this, (oxygen-enriched combustion technology is on existing coal-fired power generator set basis to oxygen-enriched combustion technology, with oxygen and the carbon dioxide mixture replacement air of proper proportion, adopt flue gas recirculation to regulate burning and the heat-transfer character of boiler simultaneously, to obtain the carbon dioxide flue gas of high concentration, compressing purifying by condensation, realizing carbon dioxide enriched a kind of combustion technology with storing on a large scale) as a kind of important carbon dioxide capture technology, obtain increasing concern.
Under normal circumstances, in air burning, according to power industry standard, the operating temperature that the coal pulverizer of brown coal and bitumionus coal allows is lower; But if this temperature standard is still adopted in oxygen-enriched combusting, then may occur that serious sour gas condensation is (when the temperature of the sour gas in coal pulverizer is equal to or less than close dew temperature, sour gas will condense in coal pulverizer) problem of corroding, this is because the close dew temperature of sour gas under oxygen-enriched combusting operating mode in coal pulverizer is lower than the close dew temperature of the sour gas in coal pulverizer under air burning operating mode.If the situation of above-mentioned sour gas dewing corrosion occurs in flue, then can be curbed by suitable anti-corrosion material substrate-based instinct, but, if the situation of above-mentioned sour gas dewing corrosion occurs in coal pulverizer, just need the running temperature improving coal pulverizer.
But, because coal pulverizer runs usually under high oxygen content condition, improve running temperature then security decline, such as, improve coal pulverizer running temperature and can increase the possibility that brown coal and bitumionus coal discharges imflammable gas in coal-grinding process, and, when accident blowing out, in coal pulverizer, the generation spontaneous combustion of coal and the possibility of blast also increase, and especially can become more serious at oxygen-enriched combusting closed system space problem.Traditional, under air burning condition, in order to prevent the coal dust in coal pulverizer from furnace shutting down process, spontaneous combustion occurring, spontaneous combustion or explosion issues usually by keeping ventilation or logical steam inerting to eliminate residual coal in coal pulverizer; But under oxygen-enriched combusting condition, if also prevent the coal dust in coal pulverizer from furnace shutting down process, spontaneous combustion occurring by said method, this greatly can increase complexity and the investment operating cost of system, and likely cause air burning and oxygen-enriched combusting frequently to switch, cause system unstable, and do not fire pyrolysis gas and particle can cause serious environmental pollution.In addition, in order to solve the problem of sour gas dewing corrosion in coal pulverizer in oxygen-enriched combusting, some factory also prevents sour gas corrosion by the material behavior changing coal pulverizer, but this may bring for factory the Cost Problems being difficult to accept, and therefore can not get applying widely.
Utility model content
The purpose of this utility model is to provide a kind of more perfect oxygen-enriched combustion system, to solve the problem of sour gas dewing corrosion in coal pulverizer in prior art, there is the problem of spontaneous combustion in the coal dust that can overcome in prior art in coal pulverizer simultaneously in furnace shutting down process.
To achieve these goals, the utility model provides a kind of oxygen-enriched combustion system, this oxygen-enriched combustion system comprises boiler and coal pulverizer, the entrance of described boiler and the outlet of described coal pulverizer, described oxygen-enriched combustion system is set to: make the temperature of the mist entered in described coal pulverizer higher than the close dew temperature of described coal pulverizer inner acidic gas; Make to enter oxygen concentration in the mist in the described coal pulverizer critical value lower than oxygen concentration in mist when causing coal dust and/or combustible gas deflagrating in described coal pulverizer.
Preferably, described oxygen-enriched combustion system is set to: during described coal pulverizer is stopped transport, and can regulate the temperature of the mist entering described coal pulverizer with realization to the cooling of coal dust remaining in described coal pulverizer and inerting.
Preferably, this oxygen-enriched combustion system comprises; Gas preheater, this gas preheater comprises gas preheater fume side passage and is positioned at the heating pipe line of described gas preheater fume side passage, described heating pipe line comprises First air preheating pipeline, the described entrance of gas preheater fume side passage and the outlet of described boiler; Flue gas processing device, the entrance of this flue gas processing device and the outlet of described gas preheater fume side passage; Flue gas recirculation pipeline, this flue gas recirculation pipeline comprise with the total pipeline of the outlet of described flue gas processing device and the gas preheater that branches out from described total pipeline before primary air piping, before described gas preheater, primary air piping is communicated with the entrance of described First air preheating pipeline, and the outlet of described First air preheating pipeline is communicated with the entrance of described coal pulverizer; Temperature-adjusting device, this temperature-adjusting device for regulating the temperature of the mist entered in described coal pulverizer, thus makes the temperature of the mist entered in described coal pulverizer higher than the close dew temperature of described coal pulverizer inner acidic gas.
Preferably, primary air piping and the first control valve after being arranged on described gas preheater primary air piping after described temperature-adjusting device comprises the gas preheater branched out from described total pipeline, after described gas preheater, primary air piping is communicated with the entrance of described coal pulverizer, and described first control valve is by controlling to enter in described coal pulverizer without the amount of the flue gas of described First air preheating pipeline heating thus regulating the temperature of the mist entered in described coal pulverizer.
Preferably, this oxygen-enriched combustion system comprises the flue gas heat-exchange unit with the outlet of described gas preheater fume side passage, to make reduce from the temperature of described gas preheater fume side passage flue gas out and make this temperature higher than the close dew temperature of described coal pulverizer inner acidic gas, described flue gas heat-exchange unit is communicated with the entrance of described flue gas processing device.
Preferably, this oxygen-enriched combustion system comprises carboloy dioxide storage plant, and the flue gas part after described flue gas processing device purification enters in described carboloy dioxide storage plant and stores, and another part is by entering described total pipeline after described flue gas heat-exchange unit heating.
Preferably, this oxygen-enriched combustion system comprises the First air oxygen filling container with the outlet of described coal pulverizer.
Preferably, described heating pipe line comprises Secondary Air preheating pipeline, described oxygen-enriched combustion system comprises Secondary Air oxygen filling container, the first end of this Secondary Air oxygen filling container is communicated with described total pipeline, second end of described Secondary Air oxygen filling container is communicated with the entrance of described Secondary Air preheating pipeline, and the outlet of described Secondary Air preheating pipeline is communicated with described boiler.
Preferably, described heating pipe line comprises oxygen preheat pipeline, the outlet of described oxygen preheat pipeline is communicated with described First air oxygen filling container, boiler respectively, described oxygen-enriched combustion system comprises source of oxygen, and this source of oxygen comprises the first pipeline be communicated with described Secondary Air oxygen filling container and the second pipe be communicated with the entrance of described oxygen preheat pipeline.
Preferably, this oxygen-enriched combustion system comprises wet circulating line and is arranged on the second control valve on described wet circulating line, one end of described wet circulating line and the outlet of described gas preheater fume side passage, the other end of described wet circulating line is communicated with described total pipeline.
Preferably, this oxygen-enriched combustion system comprises seal fan, and the entrance of described seal fan is communicated with described total pipeline, and the outlet of described seal fan is communicated with described coal pulverizer.
The oxygen-enriched combustion system that the utility model provides, the problem of sour gas dewing corrosion in coal pulverizer can not only be prevented, effectively can prevent the problem of coal pulverizer spontaneous combustion of pulverized coal in furnace shutting down process simultaneously, improve the security that equipment runs, extend the service life of equipment.
Other features and advantages of the utility model are described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide further understanding of the present utility model, and forms a part for description, is used from explanation the utility model, but does not form restriction of the present utility model with detailed description of the invention one below.In the accompanying drawings:
Fig. 1 is the structural representation of the oxygen-enriched combustion system that detailed description of the invention of the present utility model provides.
Description of reference numerals
101: boiler; 102: gas preheater;
102a: gas preheater fume side passage; 102b-1: First air preheating pipeline;
102b-2: Secondary Air preheating pipeline; 102b-3: oxygen preheat pipeline;
103: total pipeline; 103a: primary air piping before gas preheater;
103b: primary air piping after gas preheater; 104: coal pulverizer;
105a: First air oxygen filling container; 105b: Secondary Air oxygen filling container;
106: the first control valves; 107: flue gas heat-exchange unit;
108: flue gas processing device; 109: wet circulating line;
110: the second control valves; 111: source of oxygen;
111a: the first pipeline; 112: seal fan;
113: deduster.
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described in detail.Should be understood that, detailed description of the invention described herein, only for instruction and explanation of the utility model, is not limited to the utility model.
In the utility model, when not doing contrary explanation, the noun of locality such as " upper and lower, left and right " of use typically refers to reference to upper and lower, left and right shown in the drawings; " inside and outside " refers to profile inside and outside relative to each parts itself.
The utility model is that the problem of sour gas dewing corrosion problem and the coal dust generation spontaneous combustion in furnace shutting down process in coal pulverizer in coal pulverizer existed based on oxygen-enriched combustion system of the prior art proposes, and is described in detail the utility model hereinafter with reference to accompanying drawing.
According to an aspect of the present utility model, the utility model provides a kind of oxygen-enriched combustion system, with reference to figure 1, this oxygen-enriched combustion system comprises boiler 101 and coal pulverizer 104, wherein, the entrance of boiler 101 and the outlet of coal pulverizer 104, simultaneously, oxygen-enriched combustion system is set to: make the temperature of the mist entered in coal pulverizer 104 higher than the close dew temperature of coal pulverizer 104 inner acidic gas, and, make to enter oxygen concentration in the mist in coal pulverizer 104 critical value lower than oxygen concentration in mist when causing coal dust and/or combustible gas deflagrating in coal pulverizer 104, the minimum of a value of oxygen concentration in mist when this critical value is spontaneous combustion of pulverized coal.
In prior art, in order to solve the problem of coal pulverizer inner acidic gas dewing corrosion, have employed the method improving coal pulverizer running temperature, but because coal pulverizer runs usually under high oxygen content condition, therefore the raising of running temperature can bring potential safety hazard.To this, the running temperature not only increasing coal pulverizer 104 in the utility model also controls this temperature simultaneously, particularly, make the temperature of the mist entered in coal pulverizer 104 higher than the close dew temperature of coal pulverizer 104 inner acidic gas, doing so avoids the problem of coal pulverizer 104 inner acidic gas dewing corrosion, but so still can there is safety issue as prior art, therefore, the utility model also controls the concentration of the oxygen in the mist entered in coal pulverizer 104 simultaneously, particularly, make to enter oxygen concentration in the mist in coal pulverizer 104 lower than the safe concentration causing spontaneous combustion of pulverized coal in coal pulverizer 104, even if the running temperature that improve coal pulverizer so also can not cause the problem of the coal dust generation spontaneous combustion in furnace shutting down process in coal pulverizer.The oxygen-enriched combustion system that the utility model provides, sour gas dewing corrosion in coal pulverizer 104 can not only be prevented, effectively can prevent the generation of coal pulverizer 104 problem of spontaneous combustion of pulverized coal in furnace shutting down process simultaneously, improve the security that equipment runs, extend the service life of equipment.
Wherein, described oxygen-enriched combustion system is set to: during coal pulverizer 104 is stopped transport, and the temperature of the mist entering coal pulverizer 104 can be regulated to realize the cooling of coal dust remaining in coal pulverizer 104 and inerting, thus the spontaneous combustion of coal dust during preventing from stopping transport.
Particularly, above-mentioned oxygen-enriched combustion system comprises gas preheater 102, flue gas processing device 108, flue gas recirculation pipeline and temperature-adjusting device, wherein, described gas preheater 102 comprises gas preheater fume side path 10 2a and is positioned at the heating pipe line of gas preheater fume side path 10 2a, this heating pipe line comprises First air preheating pipeline 102b-1, the entrance of gas preheater fume side path 10 2a and the outlet of boiler 101 are (that is, heating pipe line (such as, First air preheating pipeline) in gas heated by the high-temperature flue gas flow through outside this heating pipe line), the entrance of flue gas processing device 108 and the outlet of gas preheater fume side path 10 2a.Described flue gas recirculation pipeline comprise with the total pipeline 103 of the outlet of flue gas processing device 108 and the gas preheater that branches out from total pipeline 103 before primary air piping 103a, before gas preheater, primary air piping 103a is communicated with the entrance of First air preheating pipeline 102b-1, the outlet of First air preheating pipeline 102b-1 is communicated with the entrance of coal pulverizer 104, particularly, the outlet of First air preheating pipeline 102b-1 can be communicated with by the entrance of pipeline with coal pulverizer 104.Described temperature-adjusting device for regulating the temperature of the mist entered in coal pulverizer 104, thus makes the temperature of the mist entered in coal pulverizer 104 higher than the close dew temperature of coal pulverizer 104 inner acidic gas.That is, being introduced into gas preheater fume side path 10 2a cooling from boiler 101 flue gas out (can be first by cooling after deduster 113 dedusting again, can certainly first cool dedusting again, these needs are determined according to actual conditions), then enter flue gas processing device 108 to purify, flue gas after purification is respectively by total pipeline 103, before gas preheater, primary air piping 103a enters First air preheating pipeline 102b-1 and heats, flue gas after First air preheating pipeline 102b-1 heats enters coal pulverizer 104, the temperature entering the mist in coal pulverizer 104 can be regulated by temperature-adjusting device, thus make the temperature of the mist entered in coal pulverizer 104 higher than the close dew temperature of coal pulverizer 104 inner acidic gas.
Wherein, primary air piping 103b and the first control valve 106 after being arranged on gas preheater primary air piping 103b after said temperature adjusting device can comprise the gas preheater branched out from total pipeline 103, after gas preheater, primary air piping 103b is communicated with the entrance of coal pulverizer 104, first control valve 106 is by controlling to enter the amount of the flue gas heated without First air preheating pipeline 102b-1 in coal pulverizer 104 thus regulating the temperature of the mist entered in described coal pulverizer 104, in the course of the work, above-mentioned flue gas after flue gas processing device 108 purifies, total pipeline 103 can be introduced into, then primary air piping 103b after primary air piping 103a and gas preheater is entered before gas preheater respectively, before entering gas preheater, the flue gas of primary air piping 103a is heated by First air preheating pipeline 102b-1, and mix with the flue gas without First air preheating pipeline 102b-1 in primary air piping 103b after gas preheater, the temperature of mist can be regulated by the openings of sizes of adjustment first control valve 106, finally make the temperature of the mist entered in coal pulverizer 104 higher than the close dew temperature of coal pulverizer 104 inner acidic gas.
The operating temperature required due to flue gas processing device 108 is relatively low, therefore purify again after the cooled flue gas of gas preheater fume side path 10 2a first can carry out cooling twice, particularly, above-mentioned oxygen-enriched combustion system comprises the flue gas heat-exchange unit (GGH) 107 with the outlet of gas preheater fume side path 10 2a, to make reduce from the temperature of the gas preheater fume side path 10 2a flue gas out of gas preheater 102 and make this temperature higher than the close dew temperature of coal pulverizer 104 inner acidic gas, flue gas heat-exchange unit 107 is communicated with the entrance of flue gas processing device 108.
Because in oxygen-enriched combustion system, flue gas contains a large amount of carbon dioxide, therefore environmental problem is considered, simultaneously also in order to realize the maximum using of resource, above-mentioned oxygen-enriched combustion system also comprises carboloy dioxide storage plant, a flue gas part after flue gas processing device 108 purifies enters in carboloy dioxide storage plant and stores, another part enters total pipeline 103 after being heated by flue gas heat-exchange unit 107, certainly, the flue gas part after flue gas processing device 108 purifies also can directly enter range site and be used.
In addition, particularly, in order to prevent the coal dust in coal pulverizer 104 from furnace shutting down process, spontaneous combustion occurring in the utility model, above-mentioned oxygen-enriched combustion system also comprises the First air oxygen filling container 105a with the outlet of coal pulverizer 104, that is, the utility model can flue gas from coal pulverizer 104 out after to reinject oxygen, thus the excessive concentration of oxygen in mist in coal pulverizer 104 can be prevented, certainly, also can inject a small amount of oxygen before flue gas enters coal pulverizer 104, just now strictly will control the concentration of oxygen in flue gas.
Wherein, the heating pipe line of described gas preheater 102 also comprises Secondary Air preheating pipeline 102b-2, described oxygen-enriched combustion system comprises Secondary Air oxygen filling container 105b, the first end of this Secondary Air oxygen filling container 105b is communicated with total pipeline 103, second end of Secondary Air oxygen filling container 105b is communicated with the entrance of Secondary Air preheating pipeline 102b-2, and the outlet of Secondary Air preheating pipeline 102b-2 is communicated with boiler 10.
Further, described heating pipe line also comprises oxygen preheat pipeline 102b-3, oxygen is provided in order to give First air oxygen filling container 105a and Secondary Air oxygen filling container 105b, described oxygen-enriched combustion system comprises source of oxygen 111, this source of oxygen 111 comprises the first pipeline 111a be communicated with Secondary Air oxygen filling container 105b and the second pipe 111b be communicated with the entrance of oxygen preheat pipeline 102b-3, the outlet of described oxygen preheat pipeline 102b-3 respectively with First air oxygen filling container 105a, boiler 101 is communicated with, that is, from source of oxygen 111 out oxygen a part enter Secondary Air oxygen filling container 105b by the first pipeline 111a, enter Secondary Air preheating pipeline 102b-2 from Secondary Air oxygen filling container 105b gas out (i.e. the mist of circulating flue gas and oxygen) and heat, then boiler 101 is entered, to be entered oxygen preheat pipeline 102b-3 by second pipe 111b from another part of source of oxygen 111 oxygen out and heat (ordinary circumstance, heating-up temperature is not higher than 160 DEG C), First air oxygen filling container 105a is entered from an oxygen preheat pipeline 102b-3 oxygen part out, a part directly enters boiler 101, certainly the amount of oxygen in First air oxygen filling container 105a can be entered by Valve controlling, it should be noted that, oxygen purity after the oxygen amount injected by First air oxygen filling container 105a will ensure flue gas and oxygen mix reaches 12-23%, and, under accident conditions, should stop noting oxygen.This is because if containing fuel gas in flue gas, and when oxygen content in flue gas is higher, may blast in boiler, time serious, flame may enter each system (such as coal pulverizer), thus causes major accident.
In addition, in order to when flue gas processing device 108 breaks down, system can also normally work, the second control valve 110 that above-mentioned oxygen-enriched combustion system comprises wet circulating line 109 and is arranged on wet circulating line 109, wet one end of circulating line 109 and the outlet of gas preheater fume side path 10 2a, the other end of wet circulating line 109 is communicated with total pipeline 103, that is, if break down can by opening the second control valve 110 and make flue gas directly carry out circulating and without purification for flue gas processing device 108.
Further, oxygen-enriched combustion system comprises seal fan 112, the entrance of described seal fan 112 is communicated with described total pipeline 103, the outlet of seal fan 112 is communicated with coal pulverizer 104, due to coal pulverizer 104 will be entered from seal fan 112 gas out, therefore in order to the problem of sour gas dewing corrosion in coal pulverizer 104 better can be prevented, need to make the temperature entering gas in seal fan 112 also higher than the close dew temperature of coal pulverizer 104 inner acidic gas, now, flue gas heat-exchange unit (GGH) 107 can be passed through realize, that is, make the close dew temperature of temperature higher than coal pulverizer 104 inner acidic gas of the gas heated through flue gas heat-exchange unit (GGH) 107.
According to another aspect of the present utility model, the oxygen-enriched combustion system in the utility model goes for following oxygen-enriched combusting method, but is not limited to following method, and the method comprises:
Through boiler 101 discharge flue gas recirculation to coal pulverizer 104;
Control the close dew temperature of temperature higher than described coal pulverizer 104 inner acidic gas of the mist entered in described coal pulverizer 104;
Control oxygen concentration in the mist entering in described coal pulverizer 104 critical value lower than oxygen concentration in mist when causing coal dust and/or combustible gas deflagrating in described coal pulverizer 104;
Enter described boiler 101 from described coal pulverizer 104 gas out together with coal dust to burn.
Wherein, said method comprises: the flue gas of discharging from boiler 101 is after cooling and purifying, and a part carries out heating enter coal pulverizer 104 after the heating, and another part is used for storage;
Further, said method also comprises: between the outlet and described boiler 101 of described coal pulverizer 104, inject oxygen (amount of the oxygen of injection is determined according to the security of fuel gas in managing after catch fire requirement and the gas injection of burner), thus makes to enter oxygen concentration in the mist in coal pulverizer 104 critical value lower than oxygen concentration in mist when causing coal dust and/or combustible gas deflagrating in coal pulverizer 104.
Further, said method comprises: first again cool through cooled flue gas, then purify, a part for flue gas after purification first once heats, and then carry out post bake, finally enter coal pulverizer 104, another part of the flue gas after purification is used for storing or utilizing.
Below with reference to Fig. 1, the oxygen-enriched combusting method that the utility model provides is described in more details:
From the flue gas that boiler 101 is discharged, first once cool (generally through the gas preheater fume side path 10 2a of gas preheater (by air-introduced machine, flue gas can be caused gas preheater), approximately can be cooled to 140-180 DEG C), enter again flue gas heat-exchange unit 107 from gas preheater fume side path 10 2a gas out and again cool, purify through flue gas processing device 108 through cooled flue gas again, enter carboloy dioxide storage plant from the flue gas part after flue gas processing device 108 purification out and store (can by storing after compressor compresses), a part enters in flue gas heat-exchange unit 107 to heat again and (namely mentioned abovely once to heat, generally approximately be heated to 80-100 DEG C), discharged by chimney under special operation condition from flue gas heat-exchange unit 107 flue gas out, continue under nominal situation to participate in circulation, namely total pipeline 103 is entered, multiple branch is divided from total pipeline 103 flue gas out, wherein, a part enters First air preheating pipeline 102b-1 by primary air piping 103a before gas preheater and heats (i.e. post bake mentioned above, such as 110-200 DEG C can be heated to, concrete temperature parameter can be determined with calculating by experiment according to the pyrolysis characteristics of coal and dry requirement), after a part enters gas preheater, primary air piping 103b (now can pass through the first control valve 103b, control the amount of the gas entering primary air piping 103b after gas preheater), after gas preheater primary air piping 103b gas out with together with First air preheating pipeline 102b-1 gas out, enter coal pulverizer 104 (by booster fan, mist can be sent into coal pulverizer), and finally enter boiler through First air oxygen filling container 105a.
The oxygen-enriched combustion system that the utility model provides, utilize the flue gas that afterbody loops back, high concentration carbon dioxide flue gas (oxygen content is lower than 6%) in fact, after gas preheater 102 further heating, mixed with the flue gas heated without gas preheater 102 before entering coal pulverizer 104, and control the temperature of mist, thus prevent sour gas dewing corrosion in coal pulverizer 104, simultaneously, flue gas from coal pulverizer 104 out after to reinject oxygen, thus avoid the excessive concentration of oxygen in mist in coal pulverizer 104, and then prevent the problem of coal pulverizer 104 spontaneous combustion of pulverized coal in furnace shutting down process.
Below preferred embodiment of the present utility model is described by reference to the accompanying drawings in detail; but; the utility model is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection domain of the present utility model.
It should be noted that in addition, each the concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, can be combined by any suitable mode.
In addition, also can be combined between various different embodiment of the present utility model, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (11)
1. an oxygen-enriched combustion system, it is characterized in that, this oxygen-enriched combustion system comprises boiler (101) and coal pulverizer (104), the entrance of described boiler (101) and the outlet of described coal pulverizer (104), and described oxygen-enriched combustion system is set to:
Make the temperature of the mist entered in described coal pulverizer (104) higher than the close dew temperature of described coal pulverizer (104) inner acidic gas;
Make to enter oxygen concentration in the mist in described coal pulverizer (104) critical value lower than oxygen concentration in mist when causing coal dust and/or combustible gas deflagrating in described coal pulverizer (104).
2. oxygen-enriched combustion system according to claim 1, is characterized in that, described oxygen-enriched combustion system is set to:
During described coal pulverizer (104) is stopped transport, the temperature of the mist entering described coal pulverizer (104) can be regulated with realization to the cooling of remaining coal dust in described coal pulverizer (104) and inerting.
3. oxygen-enriched combustion system according to claim 1, is characterized in that, this oxygen-enriched combustion system comprises;
Gas preheater (102), this gas preheater (102) comprises gas preheater fume side passage (102a) and is positioned at the heating pipe line of described gas preheater fume side passage (102a), described heating pipe line comprises First air preheating pipeline (102b-1), the entrance of described gas preheater fume side passage (102a) and the outlet of described boiler (101);
Flue gas processing device (108), the entrance of this flue gas processing device (108) and the outlet of described gas preheater fume side passage (102a);
Flue gas recirculation pipeline, this flue gas recirculation pipeline comprise with the total pipeline (103) of the outlet of described flue gas processing device (108) and the gas preheater that branches out from described total pipeline (103) before primary air piping (103a), before described gas preheater, primary air piping (103a) is communicated with the entrance of described First air preheating pipeline (102b-1), and the outlet of described First air preheating pipeline (102b-1) is communicated with the entrance of described coal pulverizer (104);
Temperature-adjusting device, this temperature-adjusting device is used for the temperature that adjustment enters the mist in described coal pulverizer (104), thus makes the temperature of the mist entered in described coal pulverizer (104) higher than the close dew temperature of described coal pulverizer (104) inner acidic gas.
4. oxygen-enriched combustion system according to claim 3, it is characterized in that, primary air piping (103b) and the first control valve (106) after being arranged on described gas preheater primary air piping (103b) after described temperature-adjusting device comprises the gas preheater branched out from described total pipeline (103), after described gas preheater, primary air piping (103b) is communicated with the entrance of described coal pulverizer (104), described first control valve (106) is entered the amount of the flue gas heated without described First air preheating pipeline (102b-1) in described coal pulverizer (104) thus regulates the temperature of the mist entered in described coal pulverizer (104) by control.
5. oxygen-enriched combustion system according to claim 3, it is characterized in that, this oxygen-enriched combustion system comprises the flue gas heat-exchange unit (107) with the outlet of described gas preheater fume side passage (102a), to make reduce from the temperature of described gas preheater fume side passage (102a) flue gas out and make this temperature higher than the close dew temperature of described coal pulverizer (104) inner acidic gas, described flue gas heat-exchange unit (107) is communicated with the entrance of described flue gas processing device (108).
6. oxygen-enriched combustion system according to claim 5, it is characterized in that, this oxygen-enriched combustion system comprises carboloy dioxide storage plant, a flue gas part after described flue gas processing device (108) purification enters in described carboloy dioxide storage plant and stores, and another part is by entering described total pipeline (103) after described flue gas heat-exchange unit (107) heating.
7. oxygen-enriched combustion system according to claim 3, is characterized in that, this oxygen-enriched combustion system comprises the First air oxygen filling container (105a) with the outlet of described coal pulverizer (104).
8. oxygen-enriched combustion system according to claim 7, it is characterized in that, described heating pipe line comprises Secondary Air preheating pipeline (102b-2), described oxygen-enriched combustion system comprises Secondary Air oxygen filling container (105b), the first end of this Secondary Air oxygen filling container (105b) is communicated with described total pipeline (103), second end of described Secondary Air oxygen filling container (105b) is communicated with the entrance of described Secondary Air preheating pipeline (102b-2), and the outlet of described Secondary Air preheating pipeline (102b-2) is communicated with described boiler (101).
9. oxygen-enriched combustion system according to claim 8, it is characterized in that, described heating pipe line comprises oxygen preheat pipeline (102b-3), the outlet of described oxygen preheat pipeline (102b-3) respectively with described First air oxygen filling container (105a), boiler (101) is communicated with, described oxygen-enriched combustion system comprises source of oxygen (111), this source of oxygen (111) comprises the first pipeline (111a) be communicated with described Secondary Air oxygen filling container (105b) and the second pipe (111b) be communicated with the entrance of described oxygen preheat pipeline (102b-3).
10. according to the oxygen-enriched combustion system in claim 3-9 described in any one, it is characterized in that, this oxygen-enriched combustion system comprises wet circulating line (109) and is arranged on the second control valve (110) on described wet circulating line (109), one end of described wet circulating line (109) and the outlet of described gas preheater fume side passage (102a), the other end of described wet circulating line (109) is communicated with described total pipeline (103).
11. oxygen-enriched combustion systems according to claim 9, it is characterized in that, this oxygen-enriched combustion system comprises seal fan (112), the entrance of described seal fan (112) is communicated with described total pipeline (103), and the outlet of described seal fan (112) is communicated with described coal pulverizer (104).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520753680.4U CN204962733U (en) | 2015-09-25 | 2015-09-25 | Oxygen -enriched combustion system |
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| CN201520753680.4U CN204962733U (en) | 2015-09-25 | 2015-09-25 | Oxygen -enriched combustion system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105157020A (en) * | 2015-09-25 | 2015-12-16 | 中国神华能源股份有限公司 | Oxygen-enriched combustion system and method |
| CN111473325A (en) * | 2020-04-17 | 2020-07-31 | 西安交通大学 | O-shaped catalyst2/H2Low NO for brown coal and gasified carbon residue of O combustion boilerxSystem and method for co-firing |
-
2015
- 2015-09-25 CN CN201520753680.4U patent/CN204962733U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105157020A (en) * | 2015-09-25 | 2015-12-16 | 中国神华能源股份有限公司 | Oxygen-enriched combustion system and method |
| CN105157020B (en) * | 2015-09-25 | 2018-04-10 | 中国神华能源股份有限公司 | oxygen-enriched combustion system and method |
| CN111473325A (en) * | 2020-04-17 | 2020-07-31 | 西安交通大学 | O-shaped catalyst2/H2Low NO for brown coal and gasified carbon residue of O combustion boilerxSystem and method for co-firing |
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