CN1248771C - Reaction process for desulfurizing fume with integrated dual-circulation fluidized bed - Google Patents
Reaction process for desulfurizing fume with integrated dual-circulation fluidized bed Download PDFInfo
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- CN1248771C CN1248771C CN 01114125 CN01114125A CN1248771C CN 1248771 C CN1248771 C CN 1248771C CN 01114125 CN01114125 CN 01114125 CN 01114125 A CN01114125 A CN 01114125A CN 1248771 C CN1248771 C CN 1248771C
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Abstract
The present invention relates to a flue gas desulfurization method for a reaction integrated double-circulation fluidized bed. Flue gas enters a reactor through a Venturi tube from the bottom; water is sprayed in the reactor along a flue gas direction by an atomization nozzle on the throat of the Venturi tube; desulfurizing agents and circulated powdery materials are added to the reactor on the outlet of the Venturi tube; after being fully and rapidly mixed at the bottom of the reactor, materials of a gas phase, a liquid phase and a solid phase upwards flow for desulfurizing reaction; after the reaction, the flue gas is initially separated by the internal separation structure of the outlet of the reactor; the flue gas initially separated is separated by an external separation device; dry materials return to the outlet of the Venturi tube at the bottom of the reactor by a circulation device and continuously react; and then, clean flue gas without acidic materials enters the original flue gas dust removal system.
Description
Technical field:
The present invention relates to a kind of flue gas desulfurization technique, this technology is one of the technology that is widely used in the emission control process of coal-fired station and refuse-burning plant exhaust pollutant sulfur dioxide, is particularly suitable for the desulfur technology improvement project of existing medium and small unit.
Background technology:
Sulfur dioxide is one of major pollutants that cause problem of environmental pollutions such as greenhouse effects, acid rain.Because in the energy resource structure of China, fire coal accounts for more than 70% always for a long time, in foreseeable future, China is that the energy resource structure of main energy sources can not obtain radical change with the coal, using in a large number of coal produces a large amount of pollutants such as sulfur dioxide, and at present, China's sulfur dioxide annual emissions has occupied first place, the world, have a strong impact on the sustainable development of Chinese national economy, and make the Chinese government face very big international pressure.For realizing the sustainable development of Chinese national economy, improve environmental aspect of China and the people's living environment, China has begun to carry out large-scale environmental improvement work, aspect flue gas desulfurization worldwide successful technology has been carried out comprehensive exploitation, introduction and demonstration project construction.
Flue gas desulfurization is divided into wet method, semidry method and dry desulfurization, the technology that the present invention relates to is a kind of of semi-dry process flue gas desulphurization technology, the basic principle of this technology is the principle of circulating fluidized bed technique, worldwide the desulfur technology of application cycle fluid bed principle has 3～4 kinds at present, the common advantage of circulating fluid bed flue-gas desulfurizing technology is that investment is less, floor space is little, system is simple to operate, desulfuration efficiency is more high, but various circulating fluidized bed desulfur technology all have different usable conditions and restrictive condition.
As: the gas suspension absorption techniques of (1) Denmark Smith Miu Le company (FLS.miljo) (GasSuspension Absorber), this technology are desulfurizing agent with the lime white, and this just brings following problem:
1. need comparatively complicated pulping system, take bigger area;
2. desulfurizing agent sprays into the slurries form, need with the wear-resisting nozzle of special shape, and the whitewashing system stops up easily, influences the normal operation of system;
3. Pen Jiang concentration of slurry has certain limitation, and when coal sulfur content height, when need adding more desulfurizing agent, this system can't use.
(2) the circulating fluid bed flue-gas desulfurizing technology of German Lu Qibixiaofu company (Lurgi) (The Lurgdrygas desul-furization Crculating Fluid Bed (CFB) process), the desulfurizing agent that this technology is used can have two kinds of sources, a kind of is to spray into lime stone at boiler tail, after high-temperature calcination, generate lime, enter the reactor of native system with flue gas; Another kind is that outsourcing lime directly adds in the circulatory system, and there is following problem in this technology:
1. if adopt the lime stone method of spraying into to add desulfurizing agent, influential, thereby influence the efficient of boiler to the heat transfer of boiler, and be easy to locate to produce wearing and tearing at boiler heating surface and pipeline etc., problems such as the ash of gathering;
2. because the dust of high concentration directly enters final deduster and can influence discharge index, therefore need locate to carry out the retrofit work of big workload, increase considerably investment for trnasforming urban land the inlet of deduster, outlet, ash bucket etc.
(3) Sweden Alsthom Power B.V (Alstom Power) circulating fluid bed flue-gas desulfurizing technology (NID:The Novel Integrated desulfurization), this technology has adopted special digester and damping machine, make and move two aspect all require very high, because directly entering final deduster, the dust of high concentration can influence discharge index simultaneously, therefore need locate to carry out the retrofit work of big workload to the inlet of deduster, outlet, ash bucket etc., increase considerably investment for trnasforming urban land.
Summary of the invention:
It is stronger that purpose of the present invention proposes a kind of applicability with regard to being the restrictive condition that exists in actual applications at various prior aries, the circulating fluid bed flue-gas desulfurizing technology that range of application is wider.
The invention provides a kind of reaction process for desulfurizing fume with integrated dual-circulation fluidized bed, is desulfurizing agent with the calcium salt, adopts circulating fluidized bed technique, it is characterized in that basic process is as follows:
1) the next flue gas of station boiler afterbody enters reactor through Venturi tube from the bottom, 120～180 ℃ of the temperature of flue gas, sulfur content 200～10000mg/m
3
2) desuperheat humidification water sprays into reactor with atomizer along the flue gas direction in Venturi tube throat, the addition of water be controlled at make reactor temperature at 65～80 ℃;
3) desulfurizing agent and circulation granular material join reactor in the Venturi tube exit, and the addition of desulfurizing agent is controlled at calcium to sulphur mole ratio 1.0～1.5;
4) after the rapid fully mixing of material of reactor bottom gas, liquid, solid three-phase, and the flow direction is upward mobile, carries out desulphurization reaction simultaneously, and reactor beds material concentration is controlled at 500～3000g/m
3
5) reaction back flue gas is through the interior isolating construction initial gross separation of reactor exit, the material particle Returning reactor inside of the larger particles that produces in the course of reaction, flue gas after the initial gross separation leaves reactor and enters outer separator, and the separative efficiency of separating cycle material requires to reach 50～60% in the reactor;
6) flue gas after the initial gross separation separates through outer separator, dried shape material continues reaction through the Venturi tube outlet of EGR Returning reactor bottom, the clean flue gas that does not contain acidic materials then enters original flue gas dust collecting system, the separative efficiency of outer piece-rate system recycle stock requires to reach 96～98%, the temperature of flue gas is 65～80 ℃ at this moment, sulfur content 20～2000mg/m
3
In the reaction process for desulfurizing fume with integrated dual-circulation fluidized bed of the present invention, desulfurizer therefor is preferably calcium oxide or calcium hydroxide.
The present invention also provides a kind of reaction desulfurizing fume with integrated dual-circulation fluidized bed system that is specifically designed to said method, it is characterized in that this system is made of desulfurizing agent adding apparatus (1), spray cooling device (2), the reactor (3) that has interior isolating construction (9), the outer separator (4) of granular material, granular material EGR (5); Reactor (3), outer separator (4), the circulation of EGR (5) head and the tail are joined, spray cooling device (2) meets reactor (3) front end Venturi tube throat, and desulfurizing agent adding apparatus (1) and EGR (5) connect reactor (3) front end Venturi tube exit.
The present invention reacts in the desulfurizing fume with integrated dual-circulation fluidized bed system, and the interior isolating construction of described reactor (3) can be, according to the inertia separator structure of technological requirement in the reactor exit conventional design.
The present invention reacts in the desulfurizing fume with integrated dual-circulation fluidized bed system, and described outer piece-rate system (4) preferably adopts cheap cyclone separator.
Reaction process for desulfurizing fume with integrated dual-circulation fluidized bed of the present invention can be widely used in the flue gas that sulfur content is not more than 4% coal-fired power station boiler and handle.
The present invention has following advantage:
(1) desulfurizing agent adds with dry powder form, need not slurrying, has simplified flow process, fouling and the blockage problem of avoiding system to be in operation and to occur;
(2) adopt the spray cooling mode to adjust reaction temperature,, be particularly suitable for using flue gas processing than the boiler of high sulfur content coal to enlarge present technique to the adaptability that different coal sulfur content change.
(3) in the reactor inner circulation structure is set, make the material particle of the larger particles that produces in the course of reaction obtain initial gross separation, Returning reactor inside, heat transfer and mass transport process in the reactor have been strengthened, prolonged desulfurizing agent time of staying in reactor, make desulfurizing agent further finish desulphurization reaction, and alleviate the segregational load of follow-up granular material separation equipment.
(4) adopt independent comparatively cheap granular material separation equipment,, reduce the workload of the system reform, reduce investment for trnasforming urban land so that native system outlet dust concentration reaches the concentration of original device.
(5) concentrate on reactor bottom with the humidification of desulfurizing agent, digestion and with sour gas reaction such as sulfur in smoke, simplify flow process, reduce and take up an area of.
In a word, system of the present invention is simple, operational stability good, desulfurizing agent adaptability is strong, desulfuration efficiency is high, can reach more than 80%, and can remove sour gas such as hydrogen fluoride in the flue gas, hydrogen chloride simultaneously.
Below by embodiment in detail the present invention is described in detail.
Description of drawings:
Accompanying drawing 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, and idiographic flow is described below: the flue gas that station boiler afterbody (7) comes enters reactor (3) bottom, through Venturi tube air-flow is evenly distributed; Desuperheat humidification water sprays in Venturi tube throat by spray cooling device (2); Desulfurizing agent and circulation granular material add in the Venturi tube outlet by desulfurizing agent adding apparatus (1) and EGR (5); After the material of above-mentioned gas, liquid, solid three-phase fully mixes rapidly, and flow to upward mobile, carry out desulphurization reaction simultaneously, through arriving reactor (3) outlet after the reaction of several seconds, in reactor (3) exit isolating construction in the baffle-like (9) is set, so that the material particle of the larger particles that produces in the course of reaction obtains initial gross separation, Returning reactor (3) inside; Flue gas after the initial gross separation enters tailored flour shape material separation device (4)---cyclone separator after leaving reactor (3), dried shape material after the separation continues reaction to improve the utilization rate and the desulfuration efficiency of desulfurizing agent through the quantitative Returning reactor (3) of EGR (5), the partial reaction product effluxes through outer arranging device (6), and the flue gas after the separation then enters original flue gas dust collecting system (8).
Embodiment 1
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 3.8m, groove separator is adopted in interior separation, adopt the structure of the two outer separators of single tower, outer separator adopts common cyclone separator, and diameter is 3.3m, adopt common hydrated lime in powder as desulfurizing agent, fineness 150～300 orders, the calcium to sulphur mole ratio of employing are 1.2.Idiographic flow is:
The flue gas that comes from the station boiler afterbody enters reactor (3) bottom, through Venturi tube air-flow is evenly distributed; Desuperheat humidification water sprays in Venturi tube throat by spray cooling device (2); Desulfurizing agent and circulation granular material add in the Venturi tube outlet by desulfurizing agent adding apparatus and EGR; After the material of above-mentioned gas, liquid, solid three-phase fully mixes rapidly, and flow to upward mobile, carry out desulphurization reaction simultaneously, arrive reactor outlet through after the reaction of several seconds, isolating construction in reactor exit is provided with baffle-like, so that the material particle of the larger particles that produces in the course of reaction obtains initial gross separation, Returning reactor inside; Flue gas after the initial gross separation enters two special-purpose powdery material separation device-cyclone separators respectively after leaving reactor, dried shape material after the separation continues reaction to improve the utilization rate and the desulfuration efficiency of desulfurizing agent through the quantitative Returning reactor of EGR, the partial reaction product effluxes through outer arranging device, and the flue gas after the separation then enters original flue gas dust collecting system.The design desulfuration efficiency of this system is 85%.
Embodiment 2
Certain station boiler discharging flue gas 48.5 ten thousand stere/hour, sulfur-bearing 6000mg/Nm in the flue gas
3The reactor intended diameter is 5m, and groove separator is adopted in interior separation, adopts the structure of the two outer separators of single tower, outer separator adopts common cyclone separator, diameter is 4.8m, establishes two covers reaction system in parallel, and final capital equipment is two reactors, four outer separators, adopt common hydrated lime in powder as desulfurizing agent, fineness 150～300 orders, the calcium to sulphur mole ratio of employing are 1.4.Idiographic flow is:
The flue gas that comes from the station boiler afterbody enters reactor (3) bottom, through Venturi tube air-flow is evenly distributed; Desuperheat humidification water sprays in Venturi tube throat by spray cooling device (2); Desulfurizing agent and circulation granular material add in the Venturi tube outlet by desulfurizing agent adding apparatus and EGR; After the material of above-mentioned gas, liquid, solid three-phase fully mixes rapidly, and flow to upward mobile, carry out desulphurization reaction simultaneously, arrive reactor outlet through after the reaction of several seconds, isolating construction in reactor exit is provided with baffle-like, so that the material particle of the larger particles that produces in the course of reaction obtains initial gross separation, Returning reactor inside; Flue gas after the initial gross separation enters two special-purpose powdery material separation device-cyclone separators respectively after leaving reactor, dried shape material after the separation continues reaction to improve the utilization rate and the desulfuration efficiency of desulfurizing agent through the quantitative Returning reactor of EGR, the partial reaction product effluxes through outer arranging device, and the flue gas after the separation then enters original flue gas dust collecting system.The design desulfuration efficiency of this system is 90%.
Claims (6)
1, a kind of reaction process for desulfurizing fume with integrated dual-circulation fluidized bed is a desulfurizing agent with the calcium salt, adopts circulating fluidized bed technique, it is characterized in that basic process is as follows:
1) the next flue gas of station boiler afterbody enters reactor through Venturi tube from the bottom, 120～180 ℃ of the temperature of flue gas, sulfur content 100～10000mg/m
3
2) desuperheat humidification water sprays into reactor with atomizer along the flue gas direction in Venturi tube throat, the addition of water be controlled at make reactor temperature at 65～80 ℃;
3) desulfurizing agent and circulation granular material join reactor in the Venturi tube exit, and the addition of desulfurizing agent is controlled at calcium to sulphur mole ratio 1.0～1.5;
4) after the rapid fully mixing of material of reactor bottom gas, liquid, solid three-phase, and the flow direction is upward mobile, carries out desulphurization reaction simultaneously, and reactor beds material concentration is controlled at 500～3000g/Nm
3
5) reaction back flue gas is through the interior isolating construction initial gross separation of reactor exit, the material particle Returning reactor inside of the larger particles that produces in the course of reaction, flue gas after the initial gross separation leaves reactor and enters outer separator, and the separative efficiency of separating cycle material requires to reach 50～60% in the reactor;
6) flue gas after the initial gross separation separates through outer separator, dried shape material continues reaction through the Venturi tube outlet of EGR Returning reactor bottom, the clean flue gas that does not contain acidic materials then enters original flue gas dust collecting system, the separative efficiency of outer piece-rate system recycle stock requires to reach 96～98%, the temperature of flue gas is 65～80 ℃ at this moment, sulfur content 200～2000mg/Nm
3
2, by the described reaction process for desulfurizing fume with integrated dual-circulation fluidized bed of claim 1, it is characterized in that: described desulfurizing agent is calcium oxide or calcium hydroxide.
3, a kind of reaction desulfurizing fume with integrated dual-circulation fluidized bed system that is specifically designed to the described method of claim 1 is characterized in that this system is made of desulfurizing agent adding apparatus (1), spray cooling device (2), the reactor (3) that has interior isolating construction (31), the outer separator (4) of granular material, granular material EGR (5); Reactor (3), outer separator (4), the circulation of EGR (5) head and the tail are joined, spray cooling device (2) meets reactor (3) front end Venturi tube throat, and desulfurizing agent adding apparatus (1) and EGR (5) connect reactor (3) front end Venturi tube exit.
4, by the described reaction desulfurizing fume with integrated dual-circulation fluidized bed of claim 3 system, it is characterized in that: the inertia separator structure that the interior isolating construction of described reactor (3) designs for reactor exit.
5, by the described reaction desulfurizing fume with integrated dual-circulation fluidized bed of claim 3 system, it is characterized in that: described outer piece-rate system (4) adopts cyclone separator.
6, the described reaction process for desulfurizing fume with integrated dual-circulation fluidized bed of claim 1 is used for the flue gas that sulfur content is not more than 4% coal-fired power station boiler and handles.
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| CN 01114125 CN1248771C (en) | 2001-06-22 | 2001-06-22 | Reaction process for desulfurizing fume with integrated dual-circulation fluidized bed |
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| CN 01114125 CN1248771C (en) | 2001-06-22 | 2001-06-22 | Reaction process for desulfurizing fume with integrated dual-circulation fluidized bed |
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| CN1248771C true CN1248771C (en) | 2006-04-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102213414A (en) * | 2010-04-07 | 2011-10-12 | 华盛***有限公司 | Desulfuration electrostatic dust collection device of circulating fluidized bed (CFB) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100425329C (en) * | 2005-11-25 | 2008-10-15 | 山东大学 | Tech. for desulphuni zation of flue-gas by using integrated internal circulation and two-speed fluidized bed |
| CN1916490B (en) * | 2006-08-15 | 2012-07-04 | 周开根 | Smokeless burning technique and equipment with fire fontanel being setup inside furnace |
| CN101288825B (en) * | 2008-06-16 | 2012-02-22 | 万若（北京）环境工程技术有限公司 | Semi-dry type fume cleaning method and device |
| CN101559323B (en) * | 2009-06-03 | 2011-09-14 | 周建安 | Digestive circulating fluid bed flue gas desulfurization method and device |
| CN101768887B (en) | 2010-03-17 | 2012-12-26 | 山东和润浆纸有限公司 | Circular utilization method of straw in pulping and papermaking processes |
| CN102071071B (en) * | 2010-11-25 | 2013-06-12 | 山西天和煤气化科技有限公司 | Method for cooling and dedusting fluidized bed gasified raw coal gas |
| CN102564070A (en) * | 2012-02-27 | 2012-07-11 | 无锡超科食品有限公司 | Material drying system |
| CN108273375A (en) * | 2017-12-29 | 2018-07-13 | 铜陵铜冠神虹化工有限责任公司 | The hot carbonizer flue gas desulfurization device and technique in vulcanized sodium production |
| CN109647148B (en) * | 2019-02-28 | 2021-11-12 | 兖矿集团有限公司 | Circulating fluidized bed boiler flue gas desulfurization system and treatment method thereof |
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2001
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102213414A (en) * | 2010-04-07 | 2011-10-12 | 华盛***有限公司 | Desulfuration electrostatic dust collection device of circulating fluidized bed (CFB) |
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