CN1113682C - Two-segment desulfurizing method for high-temp combustion - Google Patents
Two-segment desulfurizing method for high-temp combustion Download PDFInfo
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- CN1113682C CN1113682C CN00101316A CN00101316A CN1113682C CN 1113682 C CN1113682 C CN 1113682C CN 00101316 A CN00101316 A CN 00101316A CN 00101316 A CN00101316 A CN 00101316A CN 1113682 C CN1113682 C CN 1113682C
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Abstract
The present invention discloses a two-segment desulfurizing method for high temperature combustion. In the two-segment desulfurizing method for high temperature combustion, air force is used for blowing partial additive powder in furnace chamber space; combustion desulphurization reaction in a coal bed of a grate furnace is partially transferred to combustion space and the whole smoke gas flow path, and SO2 released to smoke gas from the coal bed is effectively caught in time to realize two-segment desulphurization of the bed and the space; the reducing atmosphere of a high temperature combustion segment and the oxidizing atmosphere of a later stage combustion dust segment are enhanced via air distribution; the effects of desulphurization and denitration can be simultaneously realized under the precondition of ensuring combustion efficiency. The present invention enables the combustion desulphurization efficiency of the grate furnace to increase to 70% to 80%.
Description
The present invention relates to the removing of combustion products, relate in particular to a kind of method of high-temp combustion two-stage desulfurization.
Stove internal combustion desulfur technology, with low cost, technology is simple, is comparatively one of the valid approach that solves the serious disposal of pollutants problem of Industrial Boiler that China has a large capacity and a wide range.But the desulphurization during combustion efficient of calcium-based desulfurizing agent in grate furnace is low to be a global problem, when Ca/S=2, adopts the mode of directly spraying calcium in the chain furnace, and the desulphurization during combustion rate is generally 30～50%; And adopt and the mode of going into the diffusing coal premix of stove, the desulphurization during combustion rate never has important breakthrough for a long time generally 20～40%.Studies show that: causing the low main cause of calcium base calcium based additives high-temp combustion desulfurization degree in the grate furnace is to make the hot environment (about 1200 ℃) of bed in the grate furnace combustion process and sulphur-fixing agent very long time of staying (about 1 hour) in bed desulfurization reaction product C aSO
4Due to being difficult to generate in a large number or decomposing again.Therefore, we not only should consider the factor of chemical thermodynamics and kinetics, pay attention to the research of desulfurizing agent prescription and microcosmic physicochemical characteristic thereof, the more important thing is and on this basic reason of chain furnace thermal technology environment, to seek the break-through point, to improve calcium-based desulfurizing agent significantly in the low situation of grate furnace internal combustion desulfurization degree.
The purpose of this invention is to provide a kind of method that makes the grate furnace desulfuration efficiency bring up to 70～80% high-temp combustion two-stage desulfurization.
The present invention takes following measures in order to achieve the above object:
Two-segment desulfurizing method for high-temp combustion is to utilize wind-force that part calcium based additives powder is blown into furnace cavity, desulphurization during combustion reactive moieties in the grate furnace coal seam is transferred to combustion space and whole flue gas flow, to catch the SO that is discharged into from the coal seam the flue gas timely and effectively
2, realize bed and space two-stage desulfurization; And, under the prerequisite that guarantees efficiency of combustion, realize the effect of desulphurization denitration simultaneously by the reducing atmosphere of air distribution enhancing high temperature burning zone and the oxidizing atmosphere of later stage burning segment.
Advantage of the present invention: adopt that half premix partly dusts, premix air blast layering and cover three kinds of desulfurizing agent adding methods of air blast layering, realize grate furnace bed and space two-stage desulfurization, overcome simply and gone into the essential defect of direct calcium injection and desulfurization mode in diffusing coal premix of stove or the stove from time and space two aspects, made grate furnace desulphurization during combustion efficient bring up to 70-80%; And, under the prerequisite that guarantees efficiency of combustion, realize the effect of desulphurization denitration simultaneously by moving on to the afterbody burning segment behind the part air quantity of reasonable wind distribution with high temperature burning zone.
Below in conjunction with embodiment the present invention is elaborated:
Said two-segment desulfurizing method is that half premix partly dusts, premix air blast layering and cover three kinds of desulfurizing agent adding methods of air blast layering; And by moving on to the afterbody burning segment behind the part air quantity of air distribution with high temperature burning zone.
The adding method of said desulfurization calcium based additives is: 1) half premix, half spraying powder method is that the partial desulfurization calcium based additives is gone into the stokehold and the raw coal blending is even at fuel, and another part desulfurization calcium based additives is directly sprayed into stove internal combustion space, to realize grate furnace bed and space two-stage desulfurization; 2) premix air blast layered approach is that the desulfurization calcium based additives is gone into the stokehold and the raw coal blending is even at fuel, and utilize wind-force that the part calcium based additives in the coal seam is dispelled smoke space in grate furnace preheating and burning zone, to realize grate furnace bed and space two-stage desulfurization.3) covering the air blast layered approach is with desulfurization calcium based additives and raw coal layering feed, very thin one deck calcium based additives powder is evenly covered the surface, coal seam to be sent in the stove, and utilize wind-force that the part calcium based additives in the coal seam is dispelled smoke space in grate furnace preheating and burning zone, the calcium based additives that is tiled in the surface, coal seam is dispelled smoke space, to realize grate furnace bed and space two-stage desulfurization.
Said air distribution method is: guaranteeing by air distribution grate furnace suitably to be reduced in high temperature burning zone air distribution amount under the constant substantially situation of total blast volume, and the corresponding increase of afterbody burning segment air distribution amount.
Principle of the present invention: the calcium base calcium based additives main cause that the high-temp combustion desulfurization degree is low in grate furnace is: 1. organic sulfur promptly begins to decompose generation SO in the coal about 400 ℃
2, desulfurizing agent will just begin a large amount of decomposition about 800 ℃ and lime stone is as having most industrial value and using also the most widely, so the precipitation rate of organic sulfur is far longer than CaCO in grate furnace preheating section coal
3Decomposition rate, a large amount of SO
2From the coal seam, overflow and permeate into the combustion space; 2. at the grate furnace high temperature burning zone, though existing a large amount of CaCO
3Resolve into CaO, but since the influence of primary air velocity, SO
2The time of staying in the coal seam only is about 1 second, and SO
2There is serious loose contact problem with the calcium based additives that is mixed in the coal seam, so a large amount of SO
2Have little time promptly to spill in the combustion space, in combustion product gases, stop after 3～4 seconds and leave furnace outlet with the CaO reaction; 3. hot environment of bed (about 1200 ℃) and the sulphur-fixing agent very long time of staying (about 1 hour) in bed makes desulfurization reaction product C aSO in the grate furnace combustion process
4Be difficult to decompose again after a large amount of generations or the generation.Iff the method that adopts direct calcium injection and desulfurization in calcium based additives and diffusing coal premix or the stove, desulfurization degree only can reach 20～50%.And employing high-temp combustion two-stage desulfurization technology, with the desulfurization calcium based additives with half premix partly dust, premix air blast layering or cover method such as air blast layering and add in the stove, utilize wind-force that part calcium based additives powder is blown into furnace cavity, desulphurization during combustion reactive moieties in the grate furnace coal seam is transferred to combustion space and whole flue gas flow, to catch the SO that is discharged into from the coal seam the flue gas timely and effectively
2, realize bed and space two-stage desulfurization, overcome calcium base calcium based additives in the low difficulty of grate furnace internal combustion desulfurization degree from time and space two aspects, make desulfurization degree increase substantially 70～80%; And pass through air distribution, grate furnace is suitably reduced in high temperature burning zone air distribution amount, and the corresponding increase of afterbody burning segment air distribution amount, with the reducing atmosphere of enhancing high temperature burning zone and the oxidizing atmosphere of afterbody burning segment, make the sulphur content of separating out in the coal generate the CaS of more Heat stability is goods in burning zone high temperature reduction district, change into more CaSO in burning segment low-temperature oxidation section then
4, overcome CaSO
4In the difficulty of high-temperature oxydation district poor heat stability, thereby improve the desulphurization during combustion rate greatly; Moreover, make the high temperature distribution curve of grate furnace burning zone be tending towards evenly mild by moving on to the afterbody burning segment behind the part air quantity of air distribution with high temperature burning zone, and strengthened the reducing atmosphere of burning zone simultaneously, make heating power type NO
xWith fuel type NO
xGrowing amount greatly reduce, guaranteeing to have realized the effect of desulphurization denitration simultaneously under the prerequisite of efficiency of combustion preferably.
Embodiment: hotel, coal garden, Hangzhou 4T/H chain furnace, thermal testing and desulfurized effect test have been carried out in January, 1999 by Zhejiang Province's power-saving technology inspection center and Zhejiang Province's environment measuring central station, before water dust scrubber, with SO in the sampling of SYC series flue gas sampling instrument, absorption process capture, the iodimetric analysis flue gas
2Concentration; Behind water dust scrubber, use SO in the Tianhong Intelligent Meter Factory, Wuhan HT-900 type intelligent flue gas analysis-e/or determining flue gas
2Concentration, the effect of two stage combustion desulfur technology on the 4T/H chain furnace is as shown in table 1.
The effect of table 1 two stage combustion desulfur technology on the 4T/H chain furnace
Annotate: operating mode 2,3,4 is with the SO in operating mode 1 combustion product gases
2Concentration is benchmark, calculates the preceding desulphurization during combustion rate of deduster.Self sulfur-fixing rate of blank operating mode 1 before deduster is about about 10%.
| Operating condition of test | 1 | 2 | 3 | 4 |
| The test coal | Raw coal (Q b，ad＝28637kJ/kg，S t，ad＝0.81％) | |||
| Calcium based additives | / | The ZD-P type | The ZD-H type | ZD-P type+ZD-H type |
| Ca/S | / | 1.4 | 1.4 | 2 |
| Addition manner | Blank | Singly dust | Single premix | Two-stage desulfurization (half premix partly dusts) |
| Boiler load (t/h) | 2.74 | 2.30 | 2.50 | 2.21 |
| Steam pressure (Mpa) | 0.71 | 0.80 | 0.77 | 0.77 |
| O in the flue gas 2Concentration (%) | 14.8 | 15.7 | 14.3 | 15.7 |
| SO in the flue gas 2Concentration (mg/m 3.N) | 1050 | 524 | 633 | 194 |
| SO in the flue gas 2Discharge capacity (kg/h) | 6.31 | 4.25 | 3.81 | 1.57 |
| Desulphurization during combustion rate (%) before the deduster | / | 32.6 | 39.6 | 75.1 |
| Total desulfuration efficiency (%) behind the water dust scrubber | 13.0 | 63.6 | - | 83.4 |
Claims (5)
1. two-segment desulfurizing method for high-temp combustion, it is characterized in that the partial desulfurization calcium based additives is gone into the stokehold and the raw coal blending is even at fuel, in combustion process, realize the bed desulfurization, utilize wind-force that another part calcium based additives powder is blown into furnace cavity simultaneously, desulphurization during combustion reactive moieties in the grate furnace coal seam is transferred to combustion space and whole flue gas flow, to catch the SO that is discharged into from the coal seam the flue gas timely and effectively
2, realize bed and space two-stage desulfurization; And, under the prerequisite that guarantees efficiency of combustion, realize the effect of desulphurization denitration simultaneously by the reducing atmosphere of air distribution enhancing high temperature burning zone and the oxidizing atmosphere of afterbody burning segment.
2. a kind of two-segment desulfurizing method for high-temp combustion according to claim 1 is characterized in that said two-segment desulfurizing method is that half premix partly dusts, premix air blast layering and cover three kinds of desulfurizing agent adding methods of air blast layering; And by moving on to the afterbody burning segment behind the part air quantity of air distribution with high temperature burning zone.
3. a kind of two-segment desulfurizing method for high-temp combustion according to claim 1 and 2, the adding method that it is characterized in that described desulfurization calcium based additives is half premix, half spraying powder method, it is that the partial desulfurization calcium based additives is gone into the stokehold and the raw coal blending is even at fuel, and another part desulfurization calcium based additives is directly sprayed into stove internal combustion space, to realize grate furnace bed and space two-stage desulfurization.
4. a kind of two-segment desulfurizing method for high-temp combustion according to claim 1 and 2, the adding method that it is characterized in that described desulfurization calcium based additives is a premix air blast layered approach, it is that the desulfurization calcium based additives is gone into the stokehold and the raw coal blending is even at fuel, and utilize wind-force that the part calcium based additives in the coal seam is dispelled smoke space in grate furnace preheating and burning zone, to realize grate furnace bed and space two-stage desulfurization.
5. a kind of two-segment desulfurizing method for high-temp combustion according to claim 1 and 2, the adding method that it is characterized in that described desulfurization calcium based additives is for covering the air blast layered approach, it is with desulfurization calcium based additives and raw coal layering feed, very thin one deck calcium based additives powder is evenly covered the surface, coal seam to be sent in the stove, and utilize wind-force that the part calcium based additives in the coal seam is dispelled smoke space in grate furnace preheating and burning zone, the calcium based additives that is tiled in the surface, coal seam is dispelled smoke space, to realize grate furnace bed and space two-stage desulfurization.
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|---|---|---|---|
| CN00101316A CN1113682C (en) | 2000-01-05 | 2000-01-05 | Two-segment desulfurizing method for high-temp combustion |
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|---|---|---|---|
| CN00101316A CN1113682C (en) | 2000-01-05 | 2000-01-05 | Two-segment desulfurizing method for high-temp combustion |
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| CN1302683A CN1302683A (en) | 2001-07-11 |
| CN1113682C true CN1113682C (en) | 2003-07-09 |
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| CN00101316A Expired - Fee Related CN1113682C (en) | 2000-01-05 | 2000-01-05 | Two-segment desulfurizing method for high-temp combustion |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1924029A (en) * | 2002-09-19 | 2007-03-07 | 李耀中 | Heat static state desulfurizer in molten metal and desulfurization method |
| CN104266179A (en) * | 2014-10-11 | 2015-01-07 | 中国电力工程顾问集团西南电力设计院 | Limestone two-stage adding system for CFB (Circulating Fluid Bed) boiler |
| CN106402912A (en) * | 2016-08-30 | 2017-02-15 | 上海交通大学 | Method for alleviating stains on flue heating surface of boiler and reducing acid dew point of flue gas |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5160708A (en) * | 1989-03-02 | 1992-11-03 | Kawasaki Jukogyo Kabushiki Kaisha | Dry type simultaneous desulfurization and dedusting apparatus and method of operation therefor |
| US5304234A (en) * | 1991-08-30 | 1994-04-19 | Chiyoda Corporation | Gas separation process and unit therefor |
| CN1112660A (en) * | 1995-02-15 | 1995-11-29 | 李耀中 | Energy-saving uniflow heat resistance type combined boiler |
| US5500195A (en) * | 1992-11-13 | 1996-03-19 | Foster Wheeler Energy Corporation | Method for reducing gaseous emission of halogen compounds in a fluidized bed reactor |
| CN1154263A (en) * | 1996-01-11 | 1997-07-16 | 彭斯干 | Method and equipment for desulfurizing flue gas by circulation and fluidization |
-
2000
- 2000-01-05 CN CN00101316A patent/CN1113682C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5160708A (en) * | 1989-03-02 | 1992-11-03 | Kawasaki Jukogyo Kabushiki Kaisha | Dry type simultaneous desulfurization and dedusting apparatus and method of operation therefor |
| US5304234A (en) * | 1991-08-30 | 1994-04-19 | Chiyoda Corporation | Gas separation process and unit therefor |
| US5500195A (en) * | 1992-11-13 | 1996-03-19 | Foster Wheeler Energy Corporation | Method for reducing gaseous emission of halogen compounds in a fluidized bed reactor |
| CN1112660A (en) * | 1995-02-15 | 1995-11-29 | 李耀中 | Energy-saving uniflow heat resistance type combined boiler |
| CN1154263A (en) * | 1996-01-11 | 1997-07-16 | 彭斯干 | Method and equipment for desulfurizing flue gas by circulation and fluidization |
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| CN1302683A (en) | 2001-07-11 |
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