CN1188204C - Method and system of calcining-circulating fluidized bed desulfur in reaction integration furnace - Google Patents
Method and system of calcining-circulating fluidized bed desulfur in reaction integration furnace Download PDFInfo
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- CN1188204C CN1188204C CN 02109248 CN02109248A CN1188204C CN 1188204 C CN1188204 C CN 1188204C CN 02109248 CN02109248 CN 02109248 CN 02109248 A CN02109248 A CN 02109248A CN 1188204 C CN1188204 C CN 1188204C
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Abstract
The present invention relates to a desulfurization method of a calcining-circulating fluidized bed in a reaction integrated boiler, which has the main technical scheme that a calcination technology in the boiler and a desulfurization technology of a smoke gas circulating fluidized bed are combined together; limestone is used as desulfurizing agents; partial sulfur dioxide and sulfur trioxide in smoke gas generated by coal combustion are eliminated by that the limestone as the desulfurizing agents is sprayed in the boiler and calcined at a high temperature; simultaneously, the method reduces the flue gas outlet dew point of the boiler, increases the heated face of the tail of the boiler, reduces the temperature of smoke exhaust, improves the efficiency of the boiler; then, the desulfurization efficiency is further increased by the smoke gas desulfurization technology of a circulating fluidized bed. The present invention strengthens the adaptability of the desulfurizing agents by using the limestone as raw materials of the desulfurizing agents, increases the activity of the desulfurizing agents and strengthens the desulfurization effect of the desulfurizing agents by that the desulfurizing agents are sprayed in a boiler hearth and calcined. The present invention has the very outstanding advantages of simple system, small occupation area, high desulfurization efficiency, low investment cost and running cost, reliable running, etc.
Description
Technical field:
The invention belongs to the flue gas desulfurization technique field, be particularly related to the technology and the system thereof of calcining-circulating fluidized bed flue gas desulfurization in a kind of reaction integration furnace, this technology has begun to use, and will be widely used in the emission control process of coal-fired station's sulfur dioxide in flue gas, be applicable to the desulfur technology improvement project of existing various units.
Background technology:
The discharging of sulfur dioxide has caused serious acid rain to pollute and ecological damage.Coal resources in China is very abundant, is maximum in the world coal production state and country of consumption; The principal mode of coal utilization is direct burning, takies more than 80% of coal total amount, a large amount of coal-fired a large amount of pollutants such as sulfur dioxide that produce, and the discharge capacity of its sulfur dioxide ranks first in the world, and brings about great losses for national economy and people's property.Therefore reduce and the control pollution, the discharging of sulphur was the needs of global sustainable development when control was coal-fired, and is particularly important and urgent to China, and most critical is to press for the development technique advanced person, economically feasible, the Prevention Technique that environment is suitable.Flue gas desulfurization technique is the measure that China the most effectively curbs environmental pollution at present.
In recent years, along with the continuous enhancing and the environmental standard of China's economic strength are gradually strict, continuing to increase of sulfur dioxide pollution control emission dynamics, many thermal power plants' bases actual conditions have separately successively been introduced external various flue gas desulfurization technique, and have been built up the limestone-gypsum wet method, the rotating spraying semidry method, in-furnace calcium spraying adds afterbody humidification activation dry method, sea water desulfuration, the demonstration unit of electron beam desulfurization and flue gas circulating fluidized bed desulfurization technology etc.These flue gas desulfurization techniques exist investment big to some extent, and operating cost is high and need administer secondary pollution problems, and is wide according to China region, unit is numerous and diverse, medium and coal distribution situation complexity, national conditions such as shortage of water resources must the more advanced desulfur technology of development.
The in-furnace calcium spraying technology is in Finland, and the application of the U.S. etc. has certain scale.Typical in-furnace calcium spraying afterbody humidification desulfurization technology mainly contains LIFAC, LIMB, three kinds of LIDS.
The LIFAC technology of Finland IVO company exploitation divided for three steps implemented: lime stone furnace injection → flue gas humidification and dry ash recycle → add wet mortar recirculation; Its process characteristic and the scope of application are as follows:
(1) is applicable to boiler desulfurization between the coal-fired sulfur content 0.6%～2.5%.Dry ash recirculation or mortar recirculation are adopted in Ca/S=1.5～2 o'clock, and total desulfuration efficiency can reach 75%～80%.
(2) adopting the best boiler capacity of LIFAC technology is 50～300MW.
(3) technology is simple, and investment and operating cost are low.The equipment investment expense of LIFAC system only is 32% of wet desulfurization system investment, and running cost is 78% of wet desulphurization.
(4) floor space is few, is applicable to the transformation of existing power plant.
(5) no mud or sewage discharge, final solid waste can be used as building and road-making material.
The essence of LIMB method aspect desulfurization of the U.S. is identical with the LIFAC method, different is, it has increased the discharging that multistage burner is controlled nitrogen oxide.Owing to adopted air stage feeding, make the interior local temperature of stove reduce " burning to death " that the generation that has not only reduced nitrogen oxide has also reduced the desulfurizing agent surface, increased the reaction table area, improved desulfuration efficiency.
U.S. B﹠amp; The LIDS method of W company exploitation is very similar to the mortar recirculating system of LIFAC method, equals 2 at calcium sulfur ratio, and when Δ T was 15 ℃, total desulfuration efficiency of system can reach 90%.The LIDS system is suitable for the middle-size and small-size power plant desulfurization of capacity between 50～100MW of coal-burning boiler.
CFB-FGD is a kind of new flue gas desulfurization technique of early 1980s exploitation.The Lurgi type circulating fluidized bed desulfur technology of Germany, Wulff reverse-flow type flue gas circulating fluidized bed desulfurization technology, the GSA flue gas desulfurization technique of Denmark, the NID flue gas desulfurization technique of Sweden, the flue gas circulating fluidized bed desulfurization technology of National Research Center of Power-Station Combustion Engineering Technology have begun to use in the generating plant flue gas desulfurization of various scales.
The present inventor had once proposed a kind of reaction process for desulfurizing fume with integrated dual-circulation fluidized bed in June 22 calendar year 2001, number of patent application 01114125.5, it is a desulfurizing agent with calcium oxide or calcium hydroxide, adopts ciculation fluidized bed process, and system is simple, desulfuration efficiency can reach more than 80%.But for certain areas, the calcium hydroxide source is difficulty relatively, will improve the cost of desulfurization.
Summary of the invention:
The objective of the invention is to: at existing various flue gas desulfurization techniques in actual applications restrictive condition and propose a kind of stronger in China's applicability, the desulfurizer of using dry flue gas desulphurization technology widely and adapting with it.
Another object of the present invention is: reduce the consumption of water as far as possible, reduce the area occupied of desulfurizer, and use more cheap desulfurizing agent-lime stone.
The invention provides calcining-circulating fluidized bed desulfur method in a kind of reaction integration furnace, it is characterized in that: adopt lime masonry desulfurizing agent, use the technology that calcining combines with recirculating fluidized bed in the stove, remove SO effectively
2
Basic process is as follows:
1) with CaCO
3Content is greater than 90% desulfurizing agent lime stone, and calcine in the zone that joins temperature in the coal-fired power station boiler and be 850～1150 ℃, and the addition of lime stone is controlled at calcium to sulphur mole ratio 1.2～1.7, the CaO of generation and the SO in the flue gas
3, SO
2Reaction, SO
3Substantially remove 25%～35% SO
2Be removed;
2) CaO of flue gas and the generation of calcining back continues to enter the desulfurizing tower reactor lower part from the bottom through Venturi tube, work of water sprinkling for better material moisture, and gas-liquid is affixed to be touched, and circulates, and continues to remove the SO in the flue gas
2, it is 60～80 ℃ that the addition of water is controlled at the temperature that makes reactor, reactor beds material concentration is controlled at 500～3000mg/Nm
3
3) be removed SO
2Flue gas flue gas dust pelletizing system granular material separator outside the inner separator in desulfurizing tower reactor head exit enters, meet dust emission standard, SO through the dust contained flue gas concentration of dedusting
2Content is between 20～880mg/Nm
3, exhaust gas temperature is 65～80 ℃;
4) powder that is separated by outer flue gas dust pelletizing system granular material separator enters the granular material EGR, enters the desulfurizing tower reactor again, the humidification cycle desulfurization.
In the calcining-circulating fluidized bed desulfur method, the best granularity more than 80% of described desulfurizing agent lime stone is less than 70 μ m in the reaction integration furnace of the present invention.
In the calcining-circulating fluidized bed desulfur method, the coal-fired sulfur content of described station boiler is 0.1～4.0% in the reaction integration furnace of the present invention.
In the calcining-circulating fluidized bed desulfur method, described work of water sprinkling for better material moisture is in reactor and venturi junction throat, sprays into desuperheat humidification water with atomizer along the flow of flue gas direction in the reaction integration furnace of the present invention.
In the calcining-circulating fluidized bed desulfur method, the separative efficiency of separating cycle material requires to reach 50～60% in the described reactor in the reaction integration furnace of the present invention; The separative efficiency of described outer piece-rate system recycle stock requires to reach more than 98%.
The present invention also provides the system of the interior calcining-circulating fluidized bed flue gas desulfurization of stove of said method, it is characterized in that this system is by calciner plant in the stove (1), desulfurizing agent adding apparatus (3), work of water sprinkling for better material moisture heat sink (4), Venturi tube, the reactor (2) of isolating construction in having, granular material separator (5), granular material EGR (6) constitutes; Desulfurizing agent adding apparatus (3) connects calciner plant (1) in the stove; Calciner plant (1) connects desulfurizing tower reactor (2) in the stove; Work of water sprinkling for better material moisture heat sink (4) connects Venturi tube and desulfurizing tower reactor (2); Desulfurizing tower reactor (2), granular material separator (5) joins end to end with granular material EGR (6); Granular material separator (5) is connected with the smoke evacuation chimney.
The present invention follows the flue gas processing that the interior calcining-circulating fluidized bed fume desulphurization method of stove is applicable to various sulfur content coal-fired power station boilers.Compare with various flue gas desulfurization techniques, the present invention has the advantage of following uniqueness:
(1) to desulfurizing agent require low, wide material sources, cheap, make desulfurizing agent that very strong adaptability be arranged, operating cost is low;
(2) adopt the high speed reaction tower, reduce and take up an area of and cost, be easy to maximize;
(3) do not need big water gaging, desulfurization product is a solid, non-secondary pollution;
(4) calcining can remove SO in the stove in stove
3, reduce flue gas dew point, reduce the boiler heating surface cold end corrosion; In reactor, can suitably reduce reaction temperature;
(5) calcining is little to the boiler efficiency influence in the stove;
(6) the in-furnace calcium spraying calcining is less to radiation and convection heat transfer' heat-transfer by convection influence; Little to the slagging scorification performance impact in the burner hearth;
(7) have the various advantages of circulating fluid bed flue-gas desulfurizing technology.
Description of drawings;
Fig. 1 connects signal for present device.
The specific embodiment:
The embodiment of the invention all adopts the equipment shown in the accompanying drawing 1 to connect.
Certain station boiler discharging flue gas 17 ten thousand stere/hour, sulfur-bearing 2000mg/Nm in the flue gas
3, the reactor intended diameter is 2.0 meters, and height is 15 meters, and the separative efficiency of separating cycle material requires to reach 55% in the reactor, and the separative efficiency of outer piece-rate system recycle stock requires to reach more than 98%.
Idiographic flow is:
The desulfurizing agent lime stone is pressed calcium to sulphur mole ratio 1.2, and joining coal-burning boiler top temperature with desulfurizing agent adding apparatus (3) is 850～1150 ℃ zone calcining, with SO in the flue gas
3, SO
2Reaction realizes high temperature desulfurizing; Flue gas enters desulfurizing tower reactor (1) with the CaO of complete reaction not through Venturi tube then, the work of water sprinkling for better material moisture cooling, and desulfurization once more, it is 60～80 ℃ that the addition of water is controlled at the temperature that makes reactor, reactor beds material concentration is controlled at 500～3000mg/Nm
3Unreacted CaO and other solid are through separating repeatedly circulation desulfurization, and desulfurization product and dust are regularly quantitatively discharged from granular material EGR (6).The design desulfuration efficiency of this system is more than 90%.
Certain station boiler discharging flue gas 48.5 ten thousand stere/hour, sulfur-bearing 6000mg/Nm in the flue gas
3, the reactor intended diameter is 3.5 meters, and height is 20 meters, and the separative efficiency of separating cycle material requires to reach 55% in the reactor, and the separative efficiency of outer piece-rate system recycle stock requires to reach more than 98%.Idiographic flow is:
It is 850～1150 ℃ zone calcining that the desulfurizing agent lime stone joins coal-burning boiler top temperature with desulfurizing agent adding apparatus (3), with SO in the flue gas
3, SO
2Reaction realizes high temperature desulfurizing; Flue gas enters desulfurizing tower reactor (1) with the CaO of complete reaction not through Venturi tube then, the work of water sprinkling for better material moisture cooling, and desulfurization once more, it is 60～80 ℃ that the addition of water is controlled at the temperature that makes reactor, reactor beds material concentration is controlled at 500～3000mg/Nm
3Unreacted CaO and other solid are through separating repeatedly circulation desulfurization, and desulfurization product and dust are regularly quantitatively discharged from granular material EGR (6).The design desulfuration efficiency of this system is more than 90%.
Claims (7)
1, calcining-circulating fluidized bed desulfur method in a kind of reaction integration furnace is characterized in that: adopt lime masonry desulfurizing agent, use the technology that calcining combines with recirculating fluidized bed in the stove, remove SO effectively
2Basic process is as follows:
1) with CaCO
3Content is greater than 90% desulfurizing agent lime stone, and calcine in the zone that joins temperature in the coal-fired power station boiler and be 850～1150 ℃, and the addition of lime stone is controlled at calcium to sulphur mole ratio 1.2～1.7, the CaO of generation and the SO in the flue gas
3, SO
2Reaction, SO
3Substantially remove 25%～35% SO
2Be removed;
2) CaO of flue gas and the generation of calcining back continues to enter the desulfurizing tower reactor lower part from the bottom through Venturi tube, work of water sprinkling for better material moisture, and gas-liquid is affixed to be touched, and circulates, and continues to remove the SO in the flue gas
2, it is 60～80 ℃ that the addition of water is controlled at the temperature that makes reactor, reactor beds material concentration is controlled at 500～3000mg/Nm
3
3) be removed SO
2Flue gas flue gas dust pelletizing system granular material separator outside the inner separator in desulfurizing tower reactor head exit enters, meet dust emission standard, SO through the dust contained flue gas concentration of dedusting
2Content is between 20～880mg/Nm
3, exhaust gas temperature is 65～80 ℃;
4) powder that is separated by outer flue gas dust pelletizing system granular material separator enters the granular material EGR, enters the desulfurizing tower reactor again, the humidification cycle desulfurization.
2, according to calcining-circulating fluidized bed desulfur method in the described reaction integration furnace of claim 1, it is characterized in that: the granularity of described desulfurizing agent lime stone more than 80% is less than 70 μ m.
3, according to calcining-circulating fluidized bed desulfur method in the described reaction integration furnace of claim 1, it is characterized in that: the coal-fired sulfur content of described station boiler is 0.1～4.0%.
4, according to calcining-circulating fluidized bed desulfur method in the described reaction integration furnace of claim 1, it is characterized in that: described work of water sprinkling for better material moisture is in reactor and venturi junction throat, sprays into desuperheat humidification water with atomizer along the flow of flue gas direction.
5, according to calcining-circulating fluidized bed desulfur method in the described reaction integration furnace of claim 1, it is characterized in that: the separative efficiency of separating cycle material requires to reach 50～60% in the described reactor.
6, according to calcining-circulating fluidized bed desulfur method in the described reaction integration furnace of claim 1, it is characterized in that: the separative efficiency of described outer piece-rate system recycle stock requires to reach more than 98%.
7, a kind of system that is specifically designed to the interior calcining-circulating fluidized bed flue gas desulfurization of stove of the described method of claim 1, it is characterized in that this system is by calciner plant in the stove (1), desulfurizing agent adding apparatus (3), work of water sprinkling for better material moisture heat sink (4), Venturi tube, the reactor (2) of isolating construction in having, granular material separator (5), granular material EGR (6) constitutes; Desulfurizing agent adding apparatus (3) connects calciner plant (1) in the stove; Calciner plant (1) connects desulfurizing tower reactor (2) in the stove; Work of water sprinkling for better material moisture heat sink (4) connects Venturi tube and desulfurizing tower reactor (2); Desulfurizing tower reactor (2), granular material separator (5) joins end to end with granular material EGR (6); Granular material separator (5) is connected with the smoke evacuation chimney.
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|---|---|---|---|
| CN 02109248 CN1188204C (en) | 2002-03-06 | 2002-03-06 | Method and system of calcining-circulating fluidized bed desulfur in reaction integration furnace |
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| CN 02109248 CN1188204C (en) | 2002-03-06 | 2002-03-06 | Method and system of calcining-circulating fluidized bed desulfur in reaction integration furnace |
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| CN1188204C true CN1188204C (en) | 2005-02-09 |
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| CN101732958B (en) * | 2009-12-11 | 2012-10-03 | 云南大唐国际红河发电有限责任公司 | Method for improving desulfuration efficiency of fluidized bed boiler |
| CN102120128A (en) * | 2011-02-23 | 2011-07-13 | 山西格瑞环保设备有限公司 | Flue gas desulfurization process for small-sized heating or short-running-cycle boiler |
| CN103239984B (en) * | 2013-05-15 | 2015-05-06 | 山西平朔煤矸石发电有限责任公司 | Dry-process fine continuous desulfurization device and method for CFB (Circulating Fluidized Bed) boiler |
| CN104896494B (en) * | 2015-06-19 | 2017-07-28 | 山西大学 | A kind of waste-heat recovery device applied to dry desulfurizing process |
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