CN103599688A - Wet desulphurization technology and system using coal ash - Google Patents
Wet desulphurization technology and system using coal ash Download PDFInfo
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- CN103599688A CN103599688A CN201310602868.4A CN201310602868A CN103599688A CN 103599688 A CN103599688 A CN 103599688A CN 201310602868 A CN201310602868 A CN 201310602868A CN 103599688 A CN103599688 A CN 103599688A
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- flyash
- desulphurization
- coal ash
- flue gas
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Abstract
The invention discloses a wet desulphurization technology and system using coal ash. The wet desulphurization technology using coal ash mainly comprises the following steps: (1) collecting superfine coal ash in flue gas which is generated after boiler combustion, and conveying the collected superfine coal ash to a liquid preparation tank; (2) fully reacting activating oxides in the superfine coal ash with a certain proportion of water in the liquid preparation tank so as to obtain an alkaline solution; (3) conveying the alkaline solution to a desulphurization circulating pool; and (4) enabling the alkaline solution in the desulphurization circulating pool to circularly flow between a desulphurization tower and the desulphurization circulating pool so as to realize the removal of sulfur in the flue gas. The wet desulphurization system using coal ash comprises a dust collector, the liquid preparation tank, the desulphurization circulating pool and the desulphurization tower. According to the technology and the system, the removal of sulfur in the flue gas is realized by directly using the activating oxides contained in the coal ash. The desulfurized coal ash solid liquid generated after desulphurization can be reused, so that the comprehensive cyclic utilization of the coal ash is realized, and the utility value of the coal ash is fully exerted; and the wet desulphurization technology and system using the coal ash are particularly suitable for the removal of sulfur of sulfur dioxide in flue gas of small and medium-sized industrial pulverized coal boilers with the raw coal sulfur content of below 1.0%.
Description
Technical field
The present invention relates to coal dust firing flue gas desulfurization technique field, specifically refer to a kind of flyash wet desulfurizing process and system thereof utilized, be specially adapted to the desulfurization application of the small and medium-sized industrial coal powder boilers SO 2 from fume of raw coal sulfur content below 1.0%.
Background technology
Industrial coal powder boiler is the novel furnace that China developed in recent years, and flyash is the main solid waste that industrial coal powder boiler is discharged.Along with industrial development, the technology of industrial coal powder boiler is constantly ripe, and have start fast, load regulation range is wide, automaticity is high and low power consumption and other advantages, at industry, civil area, comes into operation more and more.How the flyash producing after burning processes and how to realize comprehensive cyclic utilization to it extremely crucial in industrial production, current flyash mainly, with being as concrete admixture and producing common brick field, never has good solution in processing and comprehensive cyclic utilization.Thus for coal ash lifting becomes the task of top priority for a kind of more efficiently comprehensive cyclic utilization.
The main oxides of the flyash after coal powder boiler combustion forms to be had: SiO
2, Al
2o
3, FeO, Fe
2o
3, CaO, K
2o, Na
2o, TiO
2deng, SiO wherein
2, Al
2o
3composition is 50%-70%, CaO composition 10%-20%, Na
2o occupies 1.5%-2.5%, this CaO, Na
2the oxides such as O can be made full use of by certain technique, and the present invention furthers investigate thus, from the contained CaO of existing flyash, Na
2o isoreactivity oxide sets out, and by utilizing the characteristic of coal dust ash, invents a kind of flyash wet desulfurizing process and system thereof utilized, and this case produces thus.
Summary of the invention
An object of the present invention is to provide a kind of flyash wet desulfurizing process that utilizes, and utilizes the activating oxide in flyash to realize flue gas desulfurization processing, has solved well the comprehensive cyclic utilization problem during coal dust ash is processed.
Another object of the present invention is to provide a kind of and above-mentioned technique corresponding utilize flyash wet desulfurization system.
In order to reach above-mentioned purpose, solution of the present invention is:
Utilize a flyash wet desulfurizing process, mainly comprise the following steps:
1) collect the superfined flyash in the flue gas after boiler combustion, the superfined flyash that this is collected is delivered in liquid pool processed; In this superfined flyash, contain activating oxide;
2) activating oxide in superfined flyash fully reacts with the certain proportion water in liquid pool processed, obtains alkaline solution;
3) by 2) alkaline solution of gained is delivered to desulphurization circulating pond in step;
4) alkaline solution in desulphurization circulating pond circulates between desulfurizing tower and desulphurization circulating pond, and the alkaline solution of carrying from top to bottom in desulfurizing tower, with main containing SO in the flue gas rising
2, SO
3sour gas fully react, with this, realize flue gas desulfurization.
Described 1), in step, superfined flyash feeling the pulse with the finger-tip number is at 100-500 object flyash.
Described 1), in step, the collection of the superfined flyash in flue gas is caught and collected via cyclone dust collectors, sack cleaner successively.
Described 1) in step, collect superfined flyash quantitatively and be continuously conveyed in liquid pool processed.
At the bottom of Zhong， pond, described desulphurization circulating pond, the solid waste thing of precipitation comprises the CaSO that desulfurization produces
3, by this solid waste thing input intermediate pool, by oxygenation and CaSO
3dihydrate gypsum is produced in reaction; The press filtration of afterwards the solid waste thing that is mixed with dihydrate gypsum being anhydrated, obtains the wet coal ash that is mixed with dihydrate gypsum of semi-solid preparation.
Described 4), in step, the waste water that discharge in desulphurization circulating pond flows to liquid pool processed and reuses after reclaiming.
Utilize a flyash wet desulfurization system, mainly comprise deduster, liquid pool processed, desulphurization circulating pond and desulfurizing tower; Described deduster is provided with smoke inlet, exhanst gas outlet and ash-storing bin, and this exhanst gas outlet passes to the smoke inlet of described desulfurizing tower via flue, and the ash hole of described ash-storing bin causes in described liquid pool processed; This liquid pool processed is drawn a liquid-transport pipe-line to described desulphurization circulating pond, and a circulating line is drawn to described desulfurizing tower in this desulphurization circulating pond, and a desulfuration pipeline is drawn to described desulphurization circulating pond in this desulfurizing tower bottom.
The cyclone dust collectors and the sack cleaner that before and after described deduster comprises, set gradually, described smoke inlet is located on described cyclone dust collectors, and described exhanst gas outlet is located on described sack cleaner.
The ash hole of described ash-storing bin bottom causes in described liquid pool processed via a conveying worm.
Draw on slip pipeline to filter press bottom in described desulphurization circulating pond.
Adopt after such scheme, the present invention is with respect to the beneficial effect of prior art: directly utilize activating oxide contained in coal dust ash to react with water, generate alkaline solution circulation and pass into desulfurizing tower as the desulphurization reaction agent of boiler flue gas sulphur dioxide, realize flue gas desulfurization effect.Flyash solid waste after desulfurization can become the semisolid new performance secondary utilization of laying equal stress on through press filtration, continues on for concrete admixture and produces common brick field, realizes thus the comprehensive cyclic utilization of flyash and gives full play to value.
Sulfur removal technology of the present invention and system are directly utilized this characteristic of flyash activity composition, realizing flyash recycles, be specially adapted to the desulfurization application of the small and medium-sized industrial coal powder boilers SO 2 from fume of raw coal sulfur content below 1.0%, in sweetening process without adding in addition desulphurization reaction agent, operating cost is low, qualified discharge.Without interpolation reacted constituent, also bring and do not produce waste water and waste residue, non-secondary pollution, the real advantage that turns waste into wealth that realizes.In addition, the present invention, without adopting Wet Limestone Desulfurization, compares conventional wet calcium-based desulfurization technology, more difficult generation gypsum rain phenomenon in desulfurizing tower.
Accompanying drawing explanation
Fig. 1 is the structural representation of desulphurization system of the present invention.
Label declaration
Conveying worm 22 ash holes 221
Circulating line 41 circulating pumps 42
Desulfurizing tower 5 desulfuration pipelines 51
Powder ash truck 7 loading-unloading vehicles 8
The specific embodiment
Below in conjunction with the drawings and specific embodiments, this case is described in further detail.
The present invention relates to a kind of flyash wet desulfurizing process that utilizes, mainly comprise the following steps:
1) collect the superfined flyash in the flue gas after boiler combustion, the superfined flyash that this is collected is delivered in liquid pool processed; In this superfined flyash, contain activating oxide;
2) activating oxide in superfined flyash fully reacts with the certain proportion water in liquid pool processed, obtains alkaline solution;
3) by 2) alkaline solution of gained is delivered to desulphurization circulating pond in step;
4) alkaline solution in desulphurization circulating pond circulates between desulfurizing tower and desulphurization circulating pond, and the alkaline solution of carrying from top to bottom in desulfurizing tower, with main containing SO in the flue gas rising
2, SO
3sour gas fully react, with this, realize flue gas desulfurization.
Described 1) in step, superfined flyash feeling the pulse with the finger-tip number is at the high flyash of 100-500 object burn-off rate, it is the solid waste product that coal dust (is preferably controlled at 1300 ℃ of left and right) after boiler combustion under 1200 ℃～1400 ℃ high temperature, carbon granule is in burning, volatilization and chemical reaction due to gas, form porous surface, complex-shaped burnt shape particle, specific area is about 0.8～2.4m
2/ g.Wherein major part is glass spheres, all the other are crystalline materials and do not burn particle and become a kind of hollow bead and the special powder that full particle, porous particle mix mutually with rule particle, organic substance and inorganic substances, comprise activating oxide composition in this special powder.
Described 1200 ℃～1400 ℃ temperature are the melt temperature value of clay mineral matter in coal dust, after this clay mineral matter melting, under surface tension effects, form drop, drop stirs collision (melting particulate caking property strong) absorption hole enlargement and forms bulky grain in high-speed motion.After discharging out of the furnace, the flue gas that contains superfined flyash is conventionally introduced into economizer, air preheater, through economizer, air preheater, flue gas is cooled rapidly, make bulky grain be cooled to rapidly glass microballoon, due in boiler, have can be controlled efficient burning, make clay mineral matter in coal dust almost all meltings the final glass microballoon that forms.
Described 1), in step, preferably, the collection of the superfined flyash in flue gas is caught and collected via cyclone dust collectors, sack cleaner successively.Cyclone dust collectors are used for realizing the effectively separated of glass microballoon (bulky grain) and flue gas, and it is separated with flue gas that sack cleaner is realized flyash (main component activating oxide CaO powder ash).
Described 2), in step, the separated flyash catching is directly sent into liquid pool processed by conveying worm.In course of conveying, preferably adopt quantitatively and carry continuously, guaranteeing that the ash-storing bin of deduster has certain ash amount on the one hand, preventing from leaking out bottom ash silo, affecting combustion chamber draft.On the other hand with liquid pool processed in water and reclaim waste water (platoon, fixed row) and carry out fusion, through mechanical agitation, by physics and chemistry activation method, it is carried out to activation modification, can improve the excitation rate of CaO in flyash, end reaction synthesizes alkaline solution C a(OH)
2.
Described 3) in step, this alkaline solution is delivered to desulphurization circulating pond with infusion pump, stainless steel is usingd as material in this desulphurization circulating pond, effectively prevent sour corrosion, utilize infusion pump to prolong constantly active alkaline solution is supplemented to circulatory pool, to meet the calcium ion concentration of circulatory pool solution and alkalescence value to replace the sour gas such as SO2.
Described 4) in step, the alkaline solution by circulating pump in desulphurization circulating pond directly divides upper and lower two-way to spray into desulfurizing tower as the desulfurizing agent of flue gas, the double-deck turbine wet desulfuration tower of the better employing of desulfurizing tower.Under fast cooling and moist condition, the sour gas rising in flue gas (comprises SO
2, SO
3, HCl and HF etc.) fully react with alkaline solution (by the cyclone effect in desulfurizing tower) under cyclonic separation effect from top to bottom, generating corresponding neutralized reaction product (has CaSO
3, CaSO
4, CaCl
2and CaF
2deng), realize flue gas desulfurization effect.In sweetening process, circulation solution constantly circulates between desulfurizing tower and desulphurization circulating pond, and flue gas fully contacts hybrid reaction with circulation solution and carries out desulfurization.
At the bottom of Zhong， pond, described desulphurization circulating pond, the solid waste thing of precipitation comprises the described CaSO that desulfurization produces
3.Preferably, by solid waste thing input intermediate pool, by oxygenation and CaSO
3dihydrate gypsum is produced in reaction; The press filtration of afterwards the solid waste thing that is mixed with dihydrate gypsum being anhydrated, obtains the wet coal ash that is mixed with dihydrate gypsum of semi-solid preparation, and this wet coal ash transports out can bring into play secondary utilization again.Further, described in anhydrate waste water that press filtration produces after reclaiming, then flow to liquid pool processed and reuse.Certainly, can be without intermediate pool, the press filtration of directly the solid waste thing in desulphurization circulating pond being anhydrated, the waste water of generation can reclaim and reuse equally.
To sum up, technique of the present invention is improved on existing coal dust firing and sulfur removal technology basis, the technology that each step of technique comprises complements each other, directly utilized this characteristic of flyash activity composition, in process of coal combustion, flyash contained in flue gas is collected, the flyash of collecting is for the desulfurizing agent of desulfurization, be directly used in the flue gas that boiler combustion is produced and carry out desulfurization, with this, realize the comprehensive cyclic utilization of the flyash in flue gas, for flyash comprehensive cyclic utilization provides a new way.
The corresponding above-mentioned flyash wet desulfurizing process that utilizes, the present invention also proposes a kind of flyash wet desulfurization system that utilizes, shown in Figure 1, mainly comprises deduster, liquid pool processed 3, desulphurization circulating pond 4 and desulfurizing tower 5.
Described deduster, for collecting the flyash of flue gas, which is provided with smoke inlet, exhanst gas outlet and ash-storing bin.The flue gas producing after smoke inlet boiler of feeding coal dust firing passes into, and ash-storing bin is for the temporary flyash of collecting, and after collecting, pending flue gas is sent by exhanst gas outlet.Provide in preferred embodiment the cyclone dust collectors 1 and the sack cleaner 2 that before and after deduster comprises, set gradually.Cyclone dust collectors 1 are provided with smoke inlet 11, and sack cleaner 2 bottoms are provided with ash-storing bin 21, and sack cleaner 2 is provided with exhanst gas outlet, and this exhanst gas outlet passes to the smoke inlet of desulfurizing tower 5 via flue 23 and air-introduced machine 24.
The ash hole of the ash-storing bin of described deduster causes in liquid pool 3 processed.Particularly, the ash hole of ash-storing bin 21 bottoms of sack cleaner 2 causes in liquid pool 3 processed via a conveying worm 22, and the ash hole 221 of conveying worm 22 extends in the upper shed of liquid pool 3 processed.In embodiment, conveying worm 22 also passes into the part flyash of being collected by cyclone dust collectors 1.Certainly, deduster, except providing described way of example, can also be other forms, as long as can realize, collects flyash in flue gas.
Described liquid pool processed 3 is drawn a liquid-transport pipe-line 31 to desulphurization circulating pond 4, is provided with for driving the infusion pump 32 of defeated slurry action on liquid-transport pipe-line 31.A circulating line 41 is drawn to desulfurizing tower 5 in desulphurization circulating pond 4, and the circulating pump 42 for driving alkaline solution to circulate is installed on circulating line 41.Circulating line 41 divides upper and lower two-way to introduce desulfurizing tower 5 particularly.The desulfuration pipeline 51 of desulfurizing tower 5 bottoms causes in desulphurization circulating pond 4, with this, realizes solution circulation mobilization.
The operation principle step reference of described desulphurization system is sulfur removal technology above, is not described in detail here.Further, also draw on slip pipeline 43 to one filter presses 6 bottom in desulphurization circulating pond 4, to the press filtration of anhydrating of the solid waste thing (being pulpous state) of desulphurization circulating pond 4 bottom precipitations.The recycle-water of press filtration gained preferably causes in liquid pool 3 processed by a recovery channel 61, to reclaiming waste water, carries out secondary utilization, energy-conservation, reduce discharging and environmental protection.Press filtration gained flyash solid waste is accepted by powder ash truck 7, is delivered out afterwards by loading-unloading vehicle 8.Certainly in order to realize the CaSO in solid waste thing
3oxygenation is produced dihydrate gypsum, and 6, described desulphurization circulating pond 4 and filter press are also provided with an intermediate pool, and Oxygenation carries out in this intermediate pool.
The foregoing is only the preferred embodiments of the present invention, all equalizations of doing with the claims in the present invention scope change and modify, and all should belong to the scope of the claims in the present invention.
Claims (10)
1. utilize a flyash wet desulfurizing process, it is characterized in that, mainly comprise the following steps:
1) collect the superfined flyash in the flue gas after boiler combustion, the superfined flyash that this is collected is delivered in liquid pool processed; In this superfined flyash, contain activating oxide;
2) activating oxide in superfined flyash fully reacts with the certain proportion water in liquid pool processed, obtains alkaline solution;
3) by 2) alkaline solution of gained is delivered to desulphurization circulating pond in step;
4) alkaline solution in desulphurization circulating pond circulates between desulfurizing tower and desulphurization circulating pond, and the alkaline solution of carrying from top to bottom in desulfurizing tower, with main containing SO in the flue gas rising
2, SO
3sour gas fully react, with this, realize flue gas desulfurization.
2. a kind of flyash wet desulfurizing process that utilizes as claimed in claim 1, is characterized in that described 1) in step, superfined flyash feeling the pulse with the finger-tip number is at 100-500 object flyash.
3. a kind of flyash wet desulfurizing process that utilizes as claimed in claim 1, is characterized in that described 1) in step, the collection of the superfined flyash in flue gas is caught and collected via cyclone dust collectors, sack cleaner successively.
4. a kind of flyash wet desulfurizing process that utilizes as claimed in claim 1, is characterized in that described 1) in step, collect superfined flyash quantitatively and be continuously conveyed in liquid pool processed.
5. a kind of flyash wet desulfurizing process that utilizes as claimed in claim 1, is characterized in that, at the bottom of Zhong， pond, described desulphurization circulating pond, the solid waste thing of precipitation comprises the CaSO that desulfurization produces
3, by this solid waste thing input intermediate pool, by oxygenation and CaSO
3dihydrate gypsum is produced in reaction; The press filtration of afterwards the solid waste thing that is mixed with dihydrate gypsum being anhydrated, obtains the wet coal ash that is mixed with dihydrate gypsum of semi-solid preparation.
6. a kind of flyash wet desulfurizing process that utilizes as claimed in claim 1, is characterized in that described 4) in step, the waste water that discharge in desulphurization circulating pond flows to liquid pool processed and reuses after reclaiming.
7. utilize a flyash wet desulfurization system, it is characterized in that, mainly comprise deduster, liquid pool processed, desulphurization circulating pond and desulfurizing tower; Described deduster is provided with smoke inlet, exhanst gas outlet and ash-storing bin, and this exhanst gas outlet passes to the smoke inlet of described desulfurizing tower via flue, and the ash hole of described ash-storing bin causes in described liquid pool processed; This liquid pool processed is drawn a liquid-transport pipe-line to described desulphurization circulating pond, and a circulating line is drawn to described desulfurizing tower in this desulphurization circulating pond, and a desulfuration pipeline is drawn to described desulphurization circulating pond in this desulfurizing tower bottom.
8. a kind of flyash wet desulfurization system that utilizes as claimed in claim 7, it is characterized in that, the cyclone dust collectors and the sack cleaner that before and after described deduster comprises, set gradually, described smoke inlet is located on described cyclone dust collectors, and described exhanst gas outlet is located on described sack cleaner.
9. a kind of flyash wet desulfurization system that utilizes as claimed in claim 7, is characterized in that, the ash hole of described ash-storing bin bottom causes in described liquid pool processed via a conveying worm.
10. a kind of flyash wet desulfurization system that utilizes as claimed in claim 7, is characterized in that, draw on slip pipeline to filter press bottom in described desulphurization circulating pond.
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|---|---|---|---|
| CN201310602868.4A CN103599688A (en) | 2013-11-22 | 2013-11-22 | Wet desulphurization technology and system using coal ash |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108043204A (en) * | 2017-12-20 | 2018-05-18 | 上海电力学院 | A kind of high-calcium powder flue-gas desulphurization system and its application |
| CN110597217A (en) * | 2019-10-17 | 2019-12-20 | 江苏利港电力有限公司 | Intelligent automatic ash loading system and automatic ash loading method thereof |
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| CN101502745A (en) * | 2009-02-13 | 2009-08-12 | 史汉祥 | Method for absorbing sulfuric dioxide in flue gas using fly ash as absorbing agent |
| CN203115991U (en) * | 2013-01-25 | 2013-08-07 | 福建永恒能源管理有限公司 | High-efficiency environment-friendly coal burning system with vertical boiler with bottom burner |
| CN203620493U (en) * | 2013-11-22 | 2014-06-04 | 晋江美创环保设备有限公司 | System for carrying out wet desulphurization by utilizing fly ash |
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2013
- 2013-11-22 CN CN201310602868.4A patent/CN103599688A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101502745A (en) * | 2009-02-13 | 2009-08-12 | 史汉祥 | Method for absorbing sulfuric dioxide in flue gas using fly ash as absorbing agent |
| CN203115991U (en) * | 2013-01-25 | 2013-08-07 | 福建永恒能源管理有限公司 | High-efficiency environment-friendly coal burning system with vertical boiler with bottom burner |
| CN203620493U (en) * | 2013-11-22 | 2014-06-04 | 晋江美创环保设备有限公司 | System for carrying out wet desulphurization by utilizing fly ash |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108043204A (en) * | 2017-12-20 | 2018-05-18 | 上海电力学院 | A kind of high-calcium powder flue-gas desulphurization system and its application |
| CN108043204B (en) * | 2017-12-20 | 2024-01-26 | 上海电力学院 | High-calcium pulverized coal flue gas desulfurization system and application thereof |
| CN110597217A (en) * | 2019-10-17 | 2019-12-20 | 江苏利港电力有限公司 | Intelligent automatic ash loading system and automatic ash loading method thereof |
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