CN103599691A - Technology and system for removing dust and sulfur by using coal ash - Google Patents

Technology and system for removing dust and sulfur by using coal ash Download PDF

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Publication number
CN103599691A
CN103599691A CN201310606385.1A CN201310606385A CN103599691A CN 103599691 A CN103599691 A CN 103599691A CN 201310606385 A CN201310606385 A CN 201310606385A CN 103599691 A CN103599691 A CN 103599691A
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China
Prior art keywords
flue gas
flyash
cyclone dust
desulfurizing tower
dust collectors
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CN201310606385.1A
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Chinese (zh)
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赵长兴
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Jinjiang Meichuang Environmantal Protection Equipment Co., Ltd.
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赵长兴
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Priority to CN201310606385.1A priority Critical patent/CN103599691A/en
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Abstract

The invention discloses a technology for removing dust and sulfur by using coal ash. The technology mainly comprises the following steps: (1) leading flue gas with the coal ash, which is generated after burning, into a cyclone dust collector, wherein the coal ash mainly comprises glass bead bodies, spongy porous particles and calcium oxide powder; (2) separating the glass bead bodies and the spongy porous particles adsorbing SO2, which are contained in the flue gas, from the flue gas by using the cyclone dust collector; and (3) feeding the flue gas sent out from the cyclone dust collector into a desulfurizing tower, so that the flue gas and a water circulating liquid containing a surface active agent are subjected to physical and chemical reactions so as to realize the removal of sulfur in the flue gas. The system for removing dust and sulfur by using coal ash comprises the cyclone dust collector, the desulfurizing tower and a circulating pool. The removal of sulfur in the flue gas is realized by using activating oxides contained in the flue gas through the related physical and chemical reactions, so that the up-to-standard release of the treated clean flue gas is realized. The whole technological process is concise, extremely reasonable and optimal; and the desulfurized coal ash 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.

Description

A kind of flyash dust-removing and desulfurization process and system thereof utilized
Technical field
The present invention relates to coal dust firing flue gas desulfurization technique field, specifically refer to a kind of flyash dust-removing and desulfurization process and system thereof utilized, be applicable to the desulfurization application of small and medium-sized industrial coal powder boilers SO 2 from fume.
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 effective 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, MgO etc., wherein SiO 2, Al 2o 3potter's clay class material composition is greater than 56%, and in residue alkaline matter composition, CaO composition accounts for 10%-20%, and MgO accounts for 0.5%-2%.CaO, MgO are activating oxide, can be made full use of by certain technique, and the present invention furthers investigate thus, from the contained activating oxide of existing flyash, by utilizing the characteristic of coal dust ash, invent a kind of flyash dust-removing and desulfurization process and system thereof utilized, this case produces thus.
Summary of the invention
The object of the present invention is to provide the rationally succinct flyash dust-removing and desulfurization process that utilizes of a kind of processing step, make full use of activating oxide in flyash and realize flue gas desulfurization and process, for coal dust ash comprehensive cyclic utilization provides a kind of new way.
Another object of the present invention is to provide a kind of and above-mentioned technique corresponding utilize flyash dusting and desulfuring system.
In order to reach above-mentioned purpose, solution of the present invention is:
Utilize a flyash dust-removing and desulfurization process, mainly comprise the following steps:
1) burning is introduced to cyclone dust collectors with the flue gas of flyash later, described flyash is mainly comprised of glass microballoon body, spongy porous particle and calcium oxide powder;
2) by cyclone dust collectors by glass microballoon crystal contained in flue gas and absorption SO 2sponge shape porous particle from flue gas, depart from, send the spongy particle that flyash contained in the flue gas of cyclone dust collectors is mainly calcium oxide powder and part lightweight;
3) flue gas of sending from cyclone dust collectors is sent into desulfurizing tower, in desulfurizing tower, the spongy particle of described calcium oxide powder and part lightweight and the water circulation liquid generation physics chemical action that contains surfactant, realize flue gas desulfurization.
Described 2), in step, the flyash under cyclone dust collectors depart from is delivered to powder ash truck via conveying worm and stores and transport outward.
Described 3), in step, surfactant is triethanolamine.
Described 3) in step, in desulfurizing tower desulfurization, water circulation liquid becomes desulfurization slurry, and this desulfurization slurry oxygenation is generated to the lime-ash with dihydrate gypsum, by the press filtration of anhydrating of this lime-ash, transports outward afterwards and do secondary utilization.
Described lime-ash anhydrates in press filtration, by the neutral return of waste water of gained to reuse.
A kind of flyash dusting and desulfuring system that utilizes, comprise cyclone dust collectors, desulfurizing tower and circulatory pool, these cyclone dust collectors are provided with smoke inlet, the exhanst gas outlet of described cyclone dust collectors passes to the smoke inlet of described desulfurizing tower via flue, described circulatory pool is drawn a circulating line to described desulfurizing tower, and a desulfuration pipeline is drawn to described circulatory pool in this desulfurizing tower bottom.
The ash hole of described cyclone dust collectors is provided with the conveying worm for delivery of ash material.
The outlet end of described circulating line divides upper and lower two-way to cause respectively on described desulfurizing tower.
Described circulatory pool is drawn on slip pipeline to filter press.
Described desulphurization circulating pond and described filter press are interval with an intermediate pool.
Adopt after such scheme, the present invention is with respect to the beneficial effect of prior art: make full use of calcium oxide powder (activating oxide) contained in flue gas as desulphurization reaction agent, directly in desulfurizing tower with water circulation liquid and surfactant acting in conjunction, by related physical chemical action, realize flue gas desulfurization, treated clean flue gas is realized qualified discharge, except after aqueous vapor, can directly enter atmosphere.Whole technical process is succinct, and extremely reasonably optimizing, realizes flue gas qualified discharge and low cost movement.Coal dust ash 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.
Accompanying drawing explanation
Fig. 1 is the structural representation of desulphurization system of the present invention.
Label declaration
Cyclone dust collectors 1 smoke inlet 11
Flue 12 air-introduced machines 13
Conveying worm 14 desulfurizing towers 2
Desulfuration pipeline 21 circulatory pools 3
Circulating line 31 circulating pumps 32
Slip pipeline 33 filter presses 4
Pipe blow-through 5 force (forcing) pumps 51
The first powder ash truck 6 second powder ash trucks 7
Lift truck 8
The specific embodiment
Below in conjunction with the drawings and specific embodiments, this case is described in further detail.
Utilize a flyash dust-removing and desulfurization process, mainly comprise the following steps:
1) burning is introduced to cyclone dust collectors with the flue gas of flyash later, described flyash is mainly comprised of glass microballoon body, spongy porous particle and calcium oxide powder;
2) by cyclone dust collectors to glass microballoon crystal contained in flue gas and absorption SO 2sponge shape porous particle from flue gas, depart from, send the spongy particle that flyash contained in the flue gas of cyclone dust collectors is mainly calcium oxide powder and part lightweight;
3) flue gas of sending from cyclone dust collectors is sent into desulfurizing tower, in desulfurizing tower, the spongy particle of described calcium oxide powder and part lightweight and the water circulation liquid generation physics chemical action that contains surfactant, realize flue gas desulfurization.
In coal dust firing, major part burnouts, and remaining powdered coal cinder forms glass microballoon body, spongy particle and calcium oxide ashes.Wherein, in coal dust, contain CaCO 3with other material that produces escaping gas, in high-temp combustion, generate CaO, CO 2deng other gas, due to volatilization and the chemical reaction effect of gas, form the burnt particle of porous shape, like Sponge, specific area is about 0.8～2.4m 2/ g has good saturated adsorption power to sulfur dioxide as activated carbon.Approximately 1200 ℃ of coal dust fusing points, 1280 ℃ of boiling points.Potter's clay class material forms glass microballoon crystal 1200 ℃ of left and right at molten o'clock in high-temp combustion, and glass microballoon, in the middle collision and fusion of advancing, forms the high-density large-particle that volume and quality increase, easily separated by cyclone dust collectors.The melting temperature of calcium oxide (CaO) is 2580 ℃, in stove internal combustion, cannot reach and dissolve, save as dry powder (calcium oxide powder), cyclone dust collectors cannot depart from it, in technique, with flue gas, enter desulfurizing tower and participate in desulfurization main reaction, play important acid-base neutralization balanced action.
Described 1), in step, the flue gas with flyash after burning generally first passes into air preheater, passes into afterwards cyclone dust collectors again.
Described 2), in step, the spongy particle that high-temp combustion forms can absorb water vapour and SO in flue gas is advanced 2gas, after absorption, this part forms the spongy particle of relative heavy.The glass microballoon crystal that collision and fusion increases weight thus and absorption SO 2sponge shape porous particle by cyclone dust collectors, separated, the flyash separating accounts for 75% left and right of ash amount.Further, by the flyash part under cyclone dust collectors disengaging, via conveying worm, being delivered to powder ash trolley stores and transports outward.
Described 3) in step, the water circulation liquid that circulatory pool is contained to surfactant by circulating pump divides upper and lower two-way to spray into desulfurizing tower, the double-deck turbine wet desulfuration tower of the better employing of desulfurizing tower.The spongy particle of described calcium oxide powder and part lightweight and the water circulation liquid generation physics chemical action that contains surfactant, wherein calcium oxide powder is mainly brought into play chemical desulfurization effect, first reacts generation alkaline matter with water chemistry, then with sour gas SO 2chemical reaction is realized desulfurization; The spongy particle of lightweight is mainly brought into play physical desulfurization effect, by strong absorption SO 2to realize desulfidation.The micro-surfactant adding in water circulation liquid is preferably triethanolamine.It has asymmetric parents matchmaker's property effect structure, can increase medium and in smoke pipe and desulfurizing tower, catch and grab oiliness dust and SO 2ability.
Described 3) in step, in desulfurizing tower desulfurization, water circulation liquid becomes desulfurization slurry gradually, contains calcium sulfite precipitation in this desulfurization slurry.Further, this desulfurization slurry transfers out, and via quick-fried oxygen blower fan, to desulfurization slurry oxygenation, reacts the lime-ash generating with dihydrate gypsum with calcium sulfite, by the press filtration of anhydrating of this lime-ash, then transports outward and carries out secondary utilization.Further, described lime-ash anhydrates and produces and have middle wastewater in press filtration, wastewater in this can be reclaimed to reuse.Certainly, can be to the desulfurization slurry press filtration of directly anhydrating, the wastewater recycling that can reflux equally in gained.
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, and has directly utilized this characteristic of flyash activity composition, it is passed into desulfurizing tower together with flue gas and realize flue gas desulfurization effect.Have turn waste into wealth, non-secondary pollution, the advantage such as processing step is succinct, operating cost is low, emission compliance.
The corresponding above-mentioned flyash dust-removing and desulfurization process that utilizes, the present invention also proposes a kind of flyash dusting and desulfuring system that utilizes, shown in Figure 1, mainly comprises cyclone dust collectors 1, desulfurizing tower 2 and circulatory pool 3.
Cyclone dust collectors 1 are provided with smoke inlet 11, and the exhanst gas outlet of cyclone dust collectors 1 passes to the smoke inlet of desulfurizing tower 2 via flue 12 and air-introduced machine 13.The ash hole of cyclone dust collectors 1 bottom is provided with a conveying worm 14, carries powder ash to the first powder ash truck 6 of collecting by this conveying worm 14.Adopt conveying worm 14 to carry and can goodly avoid dust to be distributed to surrounding air, powder ash be carried respond well.
Desulfuration pipeline 21 is drawn to circulatory pool 3 in desulfurizing tower 2 bottoms.For the ease of drainage, circulatory pool 3 is directly located to desulfurizing tower 2 lower positions.Circulatory pool 3 is drawn a circulating line 31 to desulfurizing tower 2, and the circulating pump 32 for driving circulation fluid to circulate is installed on circulating line 31.Preferably, circulating line 31 divides upper and lower two-way to introduce desulfurizing tower 2 particularly.The double-deck turbine wet desulfuration tower of the corresponding better employing of desulfurizing tower 2.
The operation principle step reference of described desulphurization system is sulfur removal technology above, is not described in detail here.Further, circulatory pool 3 is also drawn on slip pipeline 33 to one filter presses 4, solid waste thing (the being above-mentioned desulfurization slurry) press filtration of anhydrating to the interior band precipitation of circulatory pool 3.The recycle-water of press filtration gained preferably causes in circulatory pool 3 by a recovery channel, to carry out secondary utilization to reclaiming waste water, energy-conservation, reduce discharging and environmental protection.Press filtration gained powder ash is accepted by the second powder ash truck 7, and is transported outward by lift truck 8.Certainly circulatory pool 3 is interior can also first cause an intermediate pool (not shown) before solid waste thing is caused to filter press 4, by oxygenation, realizes the CaSO in solid waste thing 3produce as dihydrate gypsum.
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 dust-removing and desulfurization process, it is characterized in that, mainly comprise the following steps:
1) burning is introduced to cyclone dust collectors with the flue gas of flyash later, described flyash is mainly comprised of glass microballoon body, spongy porous particle and calcium oxide powder;
2) by cyclone dust collectors by glass microballoon crystal contained in flue gas and absorption SO 2sponge shape porous particle from flue gas, depart from, send the spongy particle that flyash contained in the flue gas of cyclone dust collectors is mainly calcium oxide powder and part lightweight;
3) flue gas of sending from cyclone dust collectors is sent into desulfurizing tower, in desulfurizing tower, the spongy particle of described calcium oxide powder and part lightweight and the water circulation liquid generation physics chemical action that contains surfactant, realize flue gas desulfurization.
2. a kind of flyash dust-removing and desulfurization process that utilizes as claimed in claim 1, is characterized in that described 2) in step, cyclone dust collectors depart from lower flyash and via conveying worm, are delivered to the grey truck of powder and store and transport outward.
3. a kind of flyash dust-removing and desulfurization process that utilizes as claimed in claim 1, is characterized in that described 3) in step, surfactant is triethanolamine.
4. a kind of flyash dust-removing and desulfurization process that utilizes as claimed in claim 1, it is characterized in that, described 3) in step, in desulfurizing tower desulfurization, water circulation liquid becomes desulfurization slurry, this desulfurization slurry oxygenation is generated to the lime-ash with dihydrate gypsum, by the press filtration of anhydrating of this lime-ash, transport outward afterwards and do secondary utilization.
5. a kind of flyash dust-removing and desulfurization process that utilizes as claimed in claim 1, is characterized in that, described lime-ash anhydrates in press filtration, by the neutral return of waste water of gained to reuse.
6. one kind is utilized flyash dusting and desulfuring system, it is characterized in that: comprise cyclone dust collectors, desulfurizing tower and circulatory pool, these cyclone dust collectors are provided with smoke inlet, the exhanst gas outlet of described cyclone dust collectors passes to the smoke inlet of described desulfurizing tower via flue, described circulatory pool is drawn a circulating line to described desulfurizing tower, and a desulfuration pipeline is drawn to described circulatory pool in this desulfurizing tower bottom.
7. a kind of flyash dusting and desulfuring system that utilizes as claimed in claim 6, is characterized in that: the ash hole of described cyclone dust collectors is provided with the conveying worm for delivery of ash material.
8. a kind of flyash dusting and desulfuring system that utilizes as claimed in claim 6, is characterized in that: the outlet end of described circulating line divides upper and lower two-way to cause respectively on described desulfurizing tower.
9. a kind of flyash dusting and desulfuring system that utilizes as claimed in claim 6, is characterized in that: described circulatory pool is drawn on slip pipeline to filter press.
10. a kind of flyash dusting and desulfuring system that utilizes as claimed in claim 9, is characterized in that: described desulphurization circulating pond and described filter press are interval with an intermediate pool.
CN201310606385.1A 2013-11-22 2013-11-22 Technology and system for removing dust and sulfur by using coal ash Pending CN103599691A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105056636A (en) * 2015-07-18 2015-11-18 常州市鼎日环保科技有限公司 Method for removing inhalable particles in atmosphere
CN107158942A (en) * 2017-06-30 2017-09-15 合肥天翔环境工程有限公司 A kind of sintering furnace flue-gas dust-removing and desulfurization system
CN111135656A (en) * 2020-01-17 2020-05-12 马啸天 Workshop dust explosion-proof equipment for fire control

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5768121A (en) * 1980-10-13 1982-04-26 Mitsui Miike Mach Co Ltd Stack gas desulfurization method by sea water
CN1443594A (en) * 2003-03-14 2003-09-24 姜政华 Combined high-effective wet desulfurization dust-removing equipment
CN103028323A (en) * 2012-12-10 2013-04-10 安阳化学工业集团有限责任公司 Method for desulfurization of flue gas in coal-fired boiler by using coal mortar
CN103084057A (en) * 2013-01-25 2013-05-08 福建永恒能源管理有限公司 Process for extracting coal ash to produce desulfurizer in pulverized coal combustion
CN203620504U (en) * 2013-11-22 2014-06-04 晋江美创环保设备有限公司 System for dedusting and desulfurizing by utilizing fly ash

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5768121A (en) * 1980-10-13 1982-04-26 Mitsui Miike Mach Co Ltd Stack gas desulfurization method by sea water
CN1443594A (en) * 2003-03-14 2003-09-24 姜政华 Combined high-effective wet desulfurization dust-removing equipment
CN103028323A (en) * 2012-12-10 2013-04-10 安阳化学工业集团有限责任公司 Method for desulfurization of flue gas in coal-fired boiler by using coal mortar
CN103084057A (en) * 2013-01-25 2013-05-08 福建永恒能源管理有限公司 Process for extracting coal ash to produce desulfurizer in pulverized coal combustion
CN203620504U (en) * 2013-11-22 2014-06-04 晋江美创环保设备有限公司 System for dedusting and desulfurizing by utilizing fly ash

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105056636A (en) * 2015-07-18 2015-11-18 常州市鼎日环保科技有限公司 Method for removing inhalable particles in atmosphere
CN107158942A (en) * 2017-06-30 2017-09-15 合肥天翔环境工程有限公司 A kind of sintering furnace flue-gas dust-removing and desulfurization system
CN111135656A (en) * 2020-01-17 2020-05-12 马啸天 Workshop dust explosion-proof equipment for fire control
CN111135656B (en) * 2020-01-17 2021-10-08 山东铭亿电气科技有限公司 Workshop dust explosion-proof equipment for fire control

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