CN103453538A - Ultra-low emission circulating fluidized bed boiler with three stages of desulfurization systems - Google Patents
Ultra-low emission circulating fluidized bed boiler with three stages of desulfurization systems Download PDFInfo
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Abstract
The invention discloses an ultra-low emission circulating fluidized bed boiler with three stages of desulfurization systems. The three stages of desulfurization systems include a front desulfurizing agent adding system, an inner desulfurizing agent conveying system and a deep flue gas desulfurization system, the front desulfurizing agent adding system is positioned in a coal yard area in front of the boiler, the inner desulfurizing agent conveying system is positioned in a plant area of the boiler, and the deep flue gas desulfurization system is positioned in a tail area of the boiler; the front desulfurizing agent adding system comprises a front desulfurizing agent bin and a front desulfurizing agent gravimetric adding machine below the front desulfurizing agent bin, the inner desulfurizing agent conveying system comprises an inner desulfurizing agent bin and an inner desulfurizing agent conveying feeder below the inner desulfurizing agent bin, and an efficient desulfurizing agent circulating system and a flue gas supplementary dust removing device are further arranged on the deep flue gas desulfurization system. The ultra-low emission circulating fluidized bed boiler has the advantages that the systems are simple, are low in running energy consumption, can be regulated and controlled easily and conveniently, are high in desulfurizing agent utilization rate and desulfurization efficiency and free of water resource consumption and are widely suitable to be used with new circulating fluidized bed boilers in an environment-friendly manner and to modify existing circulating fluidized bed boilers in an environment-friendly manner, and space and equipment investment can be effectively saved.
Description
Technical field
The present invention relates to Sector of Cfb Boilers, be specifically related to a kind of CFBB of the minimum discharge with three grades of desulphurization systems.
Background technology
China is main in the world coal production and country of consumption, is also to take the country that coal is main primary energy.Contain the pollutants such as a large amount of sulfur dioxide, nitrogen oxide and heavy metal in the flue gas that coal burning produces, caused serious environmental pollution.According to " 2012 China Environmental State Bulletin ", national SO 2 in waste gas discharge capacity in 2012 is up to 2117.6 ten thousand tons, and thermal power generation is one of main body of sulfur dioxide (SO2) emissions always.
For strengthen environmental protection, realize target for energy-saving and emission-reduction, " fossil-fuel power plant atmospheric pollutant emission standard " (GB13223-2011) stipulated: the existing thermal power generation boiler that is positioned at Guangxi Zhuang Autonomous Region, Chongqing City, Sichuan Province and Guizhou Province is carried out 400mg/m
3sulfur dioxide (SO2) emissions limit value, newly-built thermal power generation boiler carry out 200mg/m
3the sulfur dioxide (SO2) emissions limit value, the existing thermal power generation boiler of other non-key areas is carried out 200mg/m
3sulfur dioxide (SO2) emissions limit value, newly-built thermal power generation boiler carry out 100mg/m
3the sulfur dioxide (SO2) emissions limit value, for the thermal power generation boiler of key area, the emission limit of sulfur dioxide is only 50mg/m
3.
Well-known China is CFBB installed capacity and the country that number of units is maximum, unit parameter is the highest that installs, and traditional CFBB mainly relies on desulfuration in furnace, and after up-to-date environmental protection standard appearance, these boilers need to undergo technological transformation mostly.Domestic desulfur technology be take Gypsum Wet as main at present, Limestone-gypsum Wet Flue Gas Desulfurization Process technique need to consume a large amount of water resources, the gypsum discarded object produced is difficult for comprehensive utilization, in the area of northwest water resources shortage, ecological environment frailty, be difficult to adopt, operating cost is high in addition, if CFBB application Gypsum Wet very expensive, the thermal power plant of vast use CFBB is in the urgent need to the desulfur technology that a kind of application conditions limits less, the water consumption is low and efficiency is high, for the transformation of new-built unit and original unit.
Chinese invention patent application 200810138603.2 discloses a kind of circulating fluid bed boiler flue calcium injection and desulfurization process, the CaO powder is sent to the cyclone separator of temperature≤950 ℃ or the horizontal flue after the first steam superheater or/and desulphurization reaction occurs in back-end ductwork, owing to only having the first grade desulfurizing system, this mode obviously can't meet the requirement of up-to-date environmental protection standard, the expense of CaO is far above lime stone, because the CaO granularity is thin, the time of staying is short, utilization rate is low in addition, and system operation cost is high.
Chinese patent application 02135540.1 discloses a kind of compound desulfurizing process of circulating fluidized bed boiler.This technique adds limestone particle in CFBB, first carries out carrying out humidification desulfurization outside stove after desulfuration in furnace in conditioning Tower again, finally forms the compound desulfurizing process of the desulfurization of stove internal combustion and afterbody humidification desulfurization.This technique has improved the desulfuration efficiency of CFBB to a certain extent, but has brought many new problems because needs arrange conditioning Tower.The first, because needs utilize the lime stone of unreacted, so before the position of conditioning Tower must be arranged on deduster, difficult arrangement for existing CFBB; The second, the water of humidification process consumption own is larger, can affect deduster after flue gas with water and move, and brings the new problems such as dust exceeding, service life of equipment be short; The 3rd, the desulfuration efficiency of afterbody humidification desulfurization itself is not high, even if compound desulfurizing process still can't meet up-to-date environmental protection standard; The 4th, the flying dust quality added after water descends, and can't fully utilize.
Chinese utility model patent 2009200003396.X discloses the Novel coal-fired boiler desulfurizer that a kind of three sections sweetening processes form.This device is composed in series by CFBB, shrend activator and charged knockouts, carries out respectively the desulfurization of circulating fluid bed boiler internal combustion and external desulfurzation agent shrend activation desulfurization and the outer charged activation desulfurization of stove.Large, the charged knockouts power consumption of shrend activator water consumption that this technique is used is high, less economical.In addition, shrend activation and charged coacervation process itself can exert an influence to the flying dust activity, and the flying dust added after water can't carry out the comprehensive utilization that added value is higher, and use value is had a greatly reduced quality, the current open report that also has no this technology of use.
Chinese invention patent application 200910112434.X discloses flue gas desulfurization enhancing device and desulfurization synergistic method after a kind of circulating fluid bed boiler.The method device is provided with reactor, deduster, auxiliary system, Desulphurization recirculating system and the fresh water (FW) system of adding of absorbent.Boiler smoke is introduced into reactor and the premixed of circulation desulfurization ash, lime stone generates the quick lime powder after calcining in stove, the flying dust that is mingled with the quick lime powder enters downstream reactor with flue gas, directly reaction generation slaked lime desulfurizing reaction in reactor of quick lime after spray cooling.The method needs equally a large amount of water sprays to reduce flue-gas temperatures, strict to process control parameter, otherwise desulfuration efficiency can't guarantee, the water consumption is high, desulfuration efficiency is low, and flying dust can't fully utilize, restricted application.If use merely in addition this system, still can't meet the requirement of up-to-date environmental protection standard.
Chinese invention patent application 201110330529.6 discloses three sections desulfurizers of a kind of CFBB.This device is in boiler, in cyclone separator and in the semi-dry desulphurization device, flue gas is carried out to desulfurization, this device flue outlet pipe adopts fork formula structure, wherein a road tangentially is connected to the higher part position of semi-dry desulphurization device, the lower position that another road tangentially is connected to the semi-dry desulphurization device, use calcium hydroxide as desulfurizing agent and still need water spray due to main, the water consumption is high, desulfuration efficiency is low, flying dust can't fully utilize, and restricted application can't meet the requirement of up-to-date environmental protection standard.
Obviously, the prior art desulfuration efficiency is low, operating cost is high, the flying dust poor quality can't fully utilize, the retrofit work amount is large in addition, the water consumption is high, and the scope of application is little, for burning high sulfur coal, reaches the area higher for the sulfur dioxide (SO2) emissions level of control, water-deficient area inapplicable.Existing CFBB is high in the urgent need to developing a kind of desulfuration efficiency, and operating cost is low, anhydrous consumption, and the flue gas pollutant removing process that the improvement project amount is little, meet the requirement of national up-to-date environmental protection standard.
Summary of the invention
The shortcoming existed in order to overcome above-mentioned prior art, the object of the present invention is to provide a kind of CFBB of the minimum discharge with three grades of desulphurization systems, system of the present invention is simple, operation energy consumption is low, adjusting control is easy, sorbent utilization is high, without water resources consumption, desulfuration efficiency is high, can effectively save space and equipment investment, be widely used in the environmental transformation of the supporting and existing CFBB of new-built circulatory conveyor boiler environmental protection.
In order to achieve the above object, the present invention is by the following technical solutions:
A kind of CFBB of the minimum discharge with three grades of desulphurization systems, comprise three grades of desulphurization systems, described three grades of desulphurization systems are respectively stokehole desulfuration agent add-on system A, the degree of depth flue gas desulphurization system C that is positioned at the desulfuration in furnace agent induction system B in boiler factory building zone and is positioned at the boiler tail zone that is positioned at the front coal yard of Boiler Furnace zone; Described stokehole desulfuration agent add-on system A comprises the stokehole desulfuration agent Weighing type adding machine A2 of stokehole desulfuration agent storehouse A1 and its below, and the graininess desulfurizing agent is added on the raw coal belt conveyor 2 of 3 of coal yard raw coal 1 and raw coal crushing and screening systems by stokehole desulfuration agent storehouse A1 by stokehole desulfuration agent Weighing type adding machine A2; Described desulfuration in furnace agent induction system B comprises the desulfuration in furnace agent conveying batcher B2 of desulfuration in furnace agent storehouse B1 and its below, and desulfurizer powder is sent into burner hearth emulsion zone 7 by desulfuration in furnace agent conveying batcher B2 from feed back pipe 15 by desulfuration in furnace agent storehouse B1 and carried out desulfurization; Also be provided with efficient desulfurizing agent circulatory system C1 and flue gas on described degree of depth flue gas desulphurization system C and supplement dust arrester C2, flue gas after dedusting is cooled to after approaching saturation temperature and sends into the deep removal that degree of depth flue gas desulphurization system C carries out sulfur dioxide in flue gas by exhaust gas temperature attemperator 24, send into chimney 26 discharges by air-introduced machine 25 with supplement dust arrester C2 processing by flue gas after, described efficient desulfurizing agent is recycled by efficient desulfurizing agent circulatory system C1.
Described stokehole desulfuration agent add-on system A, desulfuration in furnace agent induction system B and degree of depth flue gas desulphurization system C desulfurizing agent use amount are separately independently regulated according to the difference of coal and SO 2 from fume concentration, stokehole desulfuration agent add-on system A and desulfuration in furnace agent induction system B altogether can remove burning and produce 50%～90% of sulfur dioxide, and remainder is removed by degree of depth flue gas desulphurization system C.
The graininess desulfurizing agent that described stokehole desulfuration agent add-on system A is used for lime stone, carbide slag, calcium hydroxide or other calcareous materials (, its particle diameter is 1～20mm, meso-position radius is 1～5mm; The desulfurizer powder that described desulfuration in furnace agent induction system B is used is lime stone, carbide slag, calcium hydroxide or other calcareous materials, and its particle diameter is 0.1～1.5mm, and meso-position radius is 0.2～0.8mm; The efficient desulfurizing agent that described degree of depth flue gas desulphurization system C is used is lime stone, carbide slag, calcium hydroxide or other calcareous materials, utilizes chemical reaction to carry out desulfurization; Or efficient desulfurizing agent is the medium that active carbon, activated coke, active carbocoal class have internal void structure and adsorption capacity, utilize adsorption reaction to carry out desulfurization.
Be added with sodium chloride or potassium chloride salt material desulfurization hardening agent in the desulfurizer powder that the graininess desulfurizing agent that described stokehole desulfuration agent add-on system A is used and desulfuration in furnace agent induction system B are used, addition is 1%～15% of desulfurizing agent interpolation total amount.
Described desulfuration in furnace agent induction system B adopts strength to carry, and it is compressed air or hp fluid air that the conveying source of the gas of batcher B2 is carried in the desulfuration in furnace agent.
Described CFBB comprises the raw coal belt conveyor 2 be connected successively with coal yard raw coal 1, raw coal crushing and screening system 3, enter stove coal belt conveyor 4, stove coal bunker 5, coal supply belt 6 and burner hearth emulsion zone 7, burner hearth emulsion zone 7 belows are communicated with by slag dropping tube 8 and slag cooler 9, slag cooler 9 and desulfuration in furnace cinder tank 27 are communicated with, burner hearth emulsion zone 7 tops are burner hearth dilute-phase zone 10, burner hearth dilute-phase zone 10 tops are communicated with by separator inlet flue 11 and separator 12, separator inlet flue 11 is provided with reducing agent spout 20, separator 12 belows are by standpipe 13, material returning valve 14 and feed back pipe 15 and burner hearth emulsion zone 7 are communicated with, separator 12 tops are communicated with by back-end ductwork 21 and deduster 23, be provided with back-end ductwork heating surface 22 in back-end ductwork 21, material returning valve 14 bottoms are provided with circulating ash delivery pipe 16, circulating ash delivery pipe 16 communicates with circulating ash cooler 17, be provided with circulating ash cooler heating surface 18 in circulating ash cooler 17, circulating ash cooler 17 and circulation ash silo 19 are communicated with successively with desulfuration in furnace cinder tank 27, deduster 23 tops are connected with exhaust gas temperature attemperator 24, exhaust gas temperature attemperator 24 is connected with degree of depth flue gas desulphurization system C, degree of depth flue gas desulphurization system C below and external desulfurzation cinder tank 28 are communicated with, deduster 23 belows and desulfuration in furnace cinder tank 27 are communicated with.
The denitrification reducing agent that described reducing agent spout 20 sprays into is aqueous solution of urea, liquefied ammonia or ammoniacal liquor.
Cooling medium in described exhaust gas temperature attemperator 24 is demineralized water.
The ignition temperature of described CFBB is 850～950 ℃.
Compared with prior art, the present invention has the following advantages:
1. system is simple, and the retrofit work amount is little, and space hold is few and equipment investment is low, goes for the alteration of circulating fluidized bed boiler of different capacitance grade and newly-built;
2. three grades of desulfurization actings in conjunction, desulfuration efficiency is high, can stablize and realize that the sulfur dioxide in flue gas concentration of emission is lower than 50mg/m
3;
3. anhydrous consumption, operation energy consumption are low, particularly are applicable to water-deficient area and near coal-mine area;
4. sweetening process does not affect the comprehensive utilization of lime-ash;
5. operation is controlled conveniently, and sorbent utilization is high, and adjusting function is good.
The most significant feature of the present invention is that three grades of desulphurization systems act on simultaneously, guarantees final denitration efficiency.For example, up-to-date standard often requires desulfuration efficiency to reach more than 98%.But utilize merely in stove, outside stove, or in stove+stove is not easy outward to realize.If, but, outside adopt in stokehold+stove+stove, the triplicity effect, reduced the needs to every one-level, system also can be simplified.
The accompanying drawing explanation
Accompanying drawing 1 is applicating flow chart of the present invention.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be described in more detail.
As shown in Figure 1, a kind of CFBB of the minimum discharge with three grades of desulphurization systems of the present invention, comprise the raw coal belt conveyor 2 be connected successively with coal yard raw coal 1, raw coal crushing and screening system 3, enter stove coal belt conveyor 4, stove coal bunker 5, coal supply belt 6 and burner hearth emulsion zone 7, burner hearth emulsion zone 7 belows are communicated with by slag dropping tube 8 and slag cooler 9, slag cooler 9 and desulfuration in furnace cinder tank 27 are communicated with, burner hearth emulsion zone 7 tops are burner hearth dilute-phase zone 10, burner hearth dilute-phase zone 10 tops are communicated with by separator inlet flue 11 and separator 12, separator inlet flue 11 is provided with reducing agent spout 20, further reduce the concentration of emission of nitrogen oxide on the basis of CFBB low nitrogen burning.Separator 12 belows are by standpipe 13, material returning valve 14 and feed back pipe 15 and burner hearth emulsion zone 7 are communicated with, separator 12 tops are communicated with by back-end ductwork 21 and deduster 23, be provided with back-end ductwork heating surface 22 in back-end ductwork 21, material returning valve 14 bottoms are provided with circulating ash delivery pipe 16, circulating ash delivery pipe 16 communicates with circulating ash cooler 17, be provided with circulating ash cooler heating surface 18 in circulating ash cooler 17, circulating ash cooler 17 and circulation ash silo 19 are communicated with successively with desulfuration in furnace cinder tank 27, when interpolation desulfurization dosage is more, use circulating ash cooler 17 can reduce the ash concentration in stove, regulate the boiler operatiopn operating mode, slow down wearing and tearing.Deduster 23 tops are connected with exhaust gas temperature attemperator 24, and exhaust gas temperature attemperator 24 is connected with degree of depth flue gas desulphurization system C, and degree of depth flue gas desulphurization system C below and external desulfurzation cinder tank 28 are communicated with, and deduster 23 belows and desulfuration in furnace cinder tank 27 are communicated with.Described three grades of desulphurization systems are respectively stokehole desulfuration agent add-on system A, the degree of depth flue gas desulphurization system C that is positioned at the desulfuration in furnace agent induction system B in boiler factory building zone and is positioned at the boiler tail zone that is positioned at the front coal yard of Boiler Furnace zone; Described stokehole desulfuration agent add-on system A comprises the stokehole desulfuration agent Weighing type adding machine A2 of stokehole desulfuration agent storehouse A1 and its below, and the graininess desulfurizing agent is added on the raw coal belt conveyor 2 of 3 of coal yard raw coal 1 and raw coal crushing and screening systems by stokehole desulfuration agent storehouse A1 by stokehole desulfuration agent Weighing type adding machine A2; Described desulfuration in furnace agent induction system B comprises the desulfuration in furnace agent conveying batcher B2 of desulfuration in furnace agent storehouse B1 and its below, and desulfurizer powder is sent into burner hearth emulsion zone 7 by desulfuration in furnace agent conveying batcher B2 from feed back pipe 15 by desulfuration in furnace agent storehouse B1 and carried out desulfurization; Also be provided with efficient desulfurizing agent circulatory system C1 and flue gas on described degree of depth flue gas desulphurization system C and supplement dust arrester C2, flue gas after dedusting is cooled to after approaching saturation temperature and sends into the deep removal that degree of depth flue gas desulphurization system C carries out sulfur dioxide in flue gas by exhaust gas temperature attemperator 24, send into chimney 26 discharges by air-introduced machine 25 with supplement dust arrester C2 processing by flue gas after, described efficient desulfurizing agent is recycled by efficient desulfurizing agent circulatory system C1.
Stokehole desulfuration agent add-on system A of the present invention, desulfuration in furnace agent induction system B and degree of depth flue gas desulphurization system C desulfurizing agent use amount are separately independently regulated according to the difference of coal and SO 2 from fume concentration, stokehole desulfuration agent add-on system A and desulfuration in furnace agent induction system B altogether can remove burning and produce 50%～90% of sulfur dioxide, and remainder is removed by degree of depth flue gas desulphurization system C.Final sulfur dioxide emissioning concentration can be low to moderate 50mg/m
3below.
As the preferred embodiment of the present invention, in order to improve desulfuration efficiency, the graininess desulfurizing agent that described stokehole desulfuration agent add-on system A is used is lime stone, carbide slag, calcium hydroxide or other calcareous materials, and its particle diameter is 1～20mm, and meso-position radius is 1～5mm; The desulfurizer powder that described desulfuration in furnace agent induction system B is used is lime stone, carbide slag, calcium hydroxide or other calcareous materials, and its particle diameter is 0.1～1.5mm, and meso-position radius is 0.2～0.8mm; The efficient desulfurizing agent that described degree of depth flue gas desulphurization system C is used is lime stone, carbide slag, calcium hydroxide or other calcareous materials, utilizes chemical reaction to carry out desulfurization; Or efficient desulfurizing agent is the medium that active carbon, activated coke, active carbocoal class have internal void structure and adsorption capacity, utilize adsorption reaction to carry out desulfurization.
Special in the high characteristics of domestic some burning in circulating fluid bed boiler temperature, be added with sodium chloride or potassium chloride salt material desulfurization hardening agent in the desulfurizer powder that the graininess desulfurizing agent that described stokehole desulfuration agent add-on system A is used and desulfuration in furnace agent induction system B are used, addition is 1%～15% of desulfurizing agent interpolation total amount.The resolution ratio of calcium sulfate while reducing burning, improve desulfuration efficiency, so the ignition temperature of CFBB is 850～950 ℃.
As the preferred embodiment of the present invention, described desulfuration in furnace agent induction system B adopts strength to carry, and it is compressed air or hp fluid air that the conveying source of the gas of batcher B2 is carried in the desulfuration in furnace agent.
As the preferred embodiment of the present invention, the denitrification reducing agent that described reducing agent spout 20 sprays into is aqueous solution of urea, liquefied ammonia or ammoniacal liquor.
As the preferred embodiment of the present invention, the cooling medium in described exhaust gas temperature attemperator 24 is demineralized water.
Because desulfuration in furnace cinder tank 27 is delivered in the desulfuration in furnace desulfurization ash unification of stokehole desulfuration agent add-on system A and desulfuration in furnace agent induction system B generation, this part grey activity is higher, can be for the production of cement, brick and tile etc., and value is higher.The external desulfurzation lime-ash that degree of depth flue gas desulphurization system C generates is sent into external desulfurzation cinder tank 28, and owing to containing calcium sulfite isoreactivity unstable material, this part ash can be for the landfill in roadbed, mining area.
Operation principle of the present invention is: coal yard raw coal 1 enters raw coal crushing and screening system 3 by raw coal belt conveyor 2, stokehole desulfuration agent add-on system A is as first order desulphurization system, the graininess desulfurizing agent that stokehole desulfuration agent add-on system A is used is stored in stokehole desulfuration agent storehouse A1, by stokehole desulfuration agent Weighing type adding machine, A2 adds on raw coal belt conveyor 2, under the crushing and screening effect of raw coal crushing and screening system 3 the graininess desulfurizing agent with raw coal, mix become contain the graininess desulfurizing agent enter the stove coal, finally by entering stove coal belt conveyor 4, deliver to into stove coal bunker 5 standby.Enter the stove coal and enter burner hearth emulsion zone 7 by coal supply belt 6 and fully burn and complete desulfurization in burning, the desulfurizer powder that desulfuration in furnace agent induction system B is used is carried batcher B2 to send into burner hearth emulsion zone 7 from feed back pipe 15 by desulfuration in furnace agent storehouse B1 by the desulfuration in furnace agent to carry out desulfurization.Lime-ash enters slag cooler 9 by slag dropping tube 8 and sends into desulfuration in furnace cinder tank 27 after cooling.The ash-laden gas that burning produces enters separator 12 via burner hearth dilute-phase zone 10 and separator inlet flue 11 respectively, it is most of that dust is separated gets off by by standpipe 13, material returning valve 14, feed back pipe 15, sending burner hearth emulsion zone 7 back to, flue gas is by back-end ductwork 21, enters deduster 23 after cooling by back-end ductwork heating surface 22.The reducing agent spout 20 of separator inlet flue 11, for spraying denitrification reducing agent.Circulating ash enters circulating ash cooler 17 through the circulating ash delivery pipe 16 of material returning valve 14 bottoms, and circulating ash is sent into desulfuration in furnace cinder tank 27 after circulating ash cooler heating surface 18 is cooling.Flue gas in deduster 23 after dedusting is cooled to after approaching saturation temperature and sends into the deep removal that degree of depth flue gas desulphurization system C realizes sulfur dioxide in flue gas by exhaust gas temperature attemperator 24, efficient desulfurizing agent can be realized recycling by efficient desulfurizing agent circulatory system C1, and the lime-ash after deep desulfuration is sent into external desulfurzation cinder tank 28.Degree of depth flue gas desulphurization system C self also is provided with flue gas and supplements dust arrester C2, and the flue gas after it is processed is finally sent into chimney 26 by air-introduced machine 25 and discharged.
Embodiment mono-
Be illustrated in figure 1 a newly-built 300MW grade recycle fluidized-bed combustion boiler, this boiler is with three grades of desulphurization systems.The ignition temperature of boiler is 900 ℃, and stokehole desulfuration agent add-on system A is used the limestone particle of meso-position radius 3mm, and the graininess desulfurizing agent that coal yard raw coal 1 and stokehole desulfuration agent add-on system A are used is sent into burner hearth emulsion zone 7 after evenly mixing.The agstone of desulfuration in furnace agent induction system B 7 conveying meso-position radius 0.5mm from from feed back pipe 15 to the burner hearth emulsion zone.Flue gas after desulfuration in furnace is sent into degree of depth flue gas desulphurization system C and is carried out deep desulfuration after exhaust gas temperature attemperator 24 is cooled to 100 ℃, and the desulfurizing agent that degree of depth flue gas desulphurization system C is used is calcium hydroxide.Reducing agent spout 20 sprays aqueous solution of urea to separator inlet flue 11, further reduces the concentration of emission of nitrogen oxide on the basis of CFBB low nitrogen burning.
Stokehole desulfuration agent add-on system A, desulfuration in furnace agent induction system B, degree of depth flue gas desulphurization system C remove respectively burning and generate 40%, 30% and 25% of sulfur dioxide, and run duration is mainly controlled final sulfur dioxide emissioning concentration lower than 50mg/m by desulfurizing agent induction system B in regulating stove and degree of depth flue gas desulphurization system C
3
Embodiment bis-
A newly-built 135MW grade recycle fluidized-bed combustion boiler, this boiler is with three grades of desulphurization systems.The ignition temperature of boiler is 935 ℃, stokehole desulfuration agent add-on system A is used the limestone particle of meso-position radius 2mm, desulfuration in furnace agent induction system B is used the agstone of meso-position radius 0.3mm, also be added with the sodium chloride desulfurization hardening agent of desulfurizing agent total amount 3% for improving desulfuration efficiency, the resolution ratio of calcium sulfate while reducing burning, improve desulfuration efficiency.
Embodiment tri-
The 200MW grade recycle fluidized-bed combustion boiler of a transformation, this boiler originally was provided with desulfuration in furnace agent induction system B, for this boiler has increased stokehole desulfuration agent add-on system A and degree of depth flue gas desulphurization system C newly, the sulfur dioxide emissioning concentration final by three grades of these boilers of desulfurization is lower than 100mg/m
3.
Embodiment tetra-
A newly-built 600MW grade recycle fluidized-bed combustion boiler, this boiler is with three grades of desulphurization systems.The ignition temperature of boiler is 880 ℃, and stokehole desulfuration agent add-on system A is used the limestone particle of meso-position radius 3mm, and desulfuration in furnace agent induction system B is used the agstone of meso-position radius 0.4mm.Degree of depth flue gas desulphurization system C is used active coke absorption method to carry out deep desulfuration, adsorbs saturated activated coke and can discharge regeneration, and the activated coke after regeneration and new activated coke are supplemented and utilized by efficient desulfurizing agent circulatory system C1.
Claims (9)
1. the CFBB of the minimum discharge with three grades of desulphurization systems, it is characterized in that: comprise three grades of desulphurization systems, described three grades of desulphurization systems are respectively the stokehole desulfuration agent add-on system (A) that is positioned at the front coal yard of Boiler Furnace zone, the degree of depth flue gas desulphurization system (C) that is positioned at the desulfuration in furnace agent induction system (B) in boiler factory building zone and is positioned at the boiler tail zone; Described stokehole desulfuration agent add-on system (A) comprises the stokehole desulfuration agent Weighing type adding machine (A2) of stokehole desulfuration agent storehouse (A1) and its below, and the graininess desulfurizing agent is added on the raw coal belt conveyor (2) between coal yard raw coal (1) and raw coal crushing and screening system (3) by stokehole desulfuration agent Weighing type adding machine (A2) by stokehole desulfuration agent storehouse (A1); Described desulfuration in furnace agent induction system (B) comprises the desulfuration in furnace agent conveying batcher (B2) of desulfuration in furnace agent storehouse (B1) and its below, and desulfurizer powder is sent into burner hearth emulsion zone (7) by desulfuration in furnace agent conveying batcher (B2) from feed back pipe (15) by desulfuration in furnace agent storehouse (B1) and carried out desulfurization; Also be provided with the efficient desulfurizing agent circulatory system (C1) and flue gas on described degree of depth flue gas desulphurization system (C) and supplement dust arrester (C2), flue gas after dedusting is cooled to after approaching saturation temperature and sends into the deep removal that degree of depth flue gas desulphurization system (C) carries out sulfur dioxide in flue gas by exhaust gas temperature attemperator (24), send into chimney (26) discharge by air-introduced machine (25) with supplement dust arrester (C2) processing by flue gas after, described efficient desulfurizing agent is recycled by the efficient desulfurizing agent circulatory system (C1).
2. a kind of CFBB of the minimum discharge with three grades of desulphurization systems according to claim 1, it is characterized in that: described stokehole desulfuration agent add-on system (A), desulfuration in furnace agent induction system (B) and degree of depth flue gas desulphurization system (C) desulfurizing agent use amount are separately independently regulated according to the difference of coal and SO 2 from fume concentration, stokehole desulfuration agent add-on system (A) and desulfuration in furnace agent induction system (B) altogether can remove burning and produce 50%～90% of sulfur dioxide, and remainder is removed by degree of depth flue gas desulphurization system (C).
3. a kind of CFBB of the minimum discharge with three grades of desulphurization systems according to claim 1, it is characterized in that: the graininess desulfurizing agent that described stokehole desulfuration agent add-on system (A) is used is lime stone, carbide slag, calcium hydroxide or other calcareous materials, its particle diameter is 1～20mm, and meso-position radius is 1～5mm; The desulfurizer powder that described desulfuration in furnace agent induction system (B) is used is lime stone, carbide slag, calcium hydroxide or other calcareous materials, and its particle diameter is 0.1～1.5mm, and meso-position radius is 0.2～0.8mm; The efficient desulfurizing agent that described degree of depth flue gas desulphurization system (C) is used is lime stone, carbide slag, calcium hydroxide or other calcareous materials, utilizes chemical reaction to carry out desulfurization; Or efficient desulfurizing agent is the medium that active carbon, activated coke, active carbocoal class have internal void structure and adsorption capacity, utilize adsorption reaction to carry out desulfurization.
4. a kind of CFBB of the minimum discharge with three grades of desulphurization systems according to claim 3, it is characterized in that: be added with sodium chloride or potassium chloride salt material desulfurization hardening agent in the desulfurizer powder that the graininess desulfurizing agent that described stokehole desulfuration agent add-on system (A) is used and desulfuration in furnace agent induction system (B) are used, addition is 1%～15% of desulfurizing agent interpolation total amount.
5. a kind of CFBB of the minimum discharge with three grades of desulphurization systems according to claim 1, it is characterized in that: described desulfuration in furnace agent induction system (B) adopts strength to carry, and it is compressed air or hp fluid air that the conveying source of the gas of batcher (B2) is carried in the desulfuration in furnace agent.
6. a kind of CFBB of the minimum discharge with three grades of desulphurization systems according to claim 1, it is characterized in that: described CFBB comprises the raw coal belt conveyor (2) be connected successively with coal yard raw coal (1), raw coal crushing and screening system (3), enter stove coal belt conveyor (4), stove coal bunker (5), coal supply belt (6) and burner hearth emulsion zone (7), burner hearth emulsion zone (7) below is communicated with by slag dropping tube (8) and slag cooler (9), slag cooler (9) and desulfuration in furnace cinder tank (27) are communicated with, burner hearth emulsion zone (7) top is burner hearth dilute-phase zone (10), burner hearth dilute-phase zone (10) top is communicated with by separator inlet flue (11) and separator (12), separator inlet flue (11) is provided with reducing agent spout (20), separator (12) below is by standpipe (13), material returning valve (14) and feed back pipe (15) and burner hearth emulsion zone (7) are communicated with, separator (12) top is communicated with by back-end ductwork (21) and deduster (23), be provided with back-end ductwork heating surface (22) in back-end ductwork (21), material returning valve (14) bottom is provided with circulating ash delivery pipe (16), circulating ash delivery pipe (16) communicates with circulating ash cooler (17), be provided with circulating ash cooler heating surface (18) in circulating ash cooler (17), circulating ash cooler (17) and circulation ash silo (19) are communicated with successively with desulfuration in furnace cinder tank (27), deduster (23) top is connected with exhaust gas temperature attemperator (24), exhaust gas temperature attemperator (24) is connected with degree of depth flue gas desulphurization system (C), degree of depth flue gas desulphurization system (C) below and external desulfurzation cinder tank (28) are communicated with, deduster (23) below and desulfuration in furnace cinder tank (27) are communicated with.
7. a kind of CFBB of the minimum discharge with three grades of desulphurization systems according to claim 6, it is characterized in that: the denitrification reducing agent that described reducing agent spout (20) sprays into is aqueous solution of urea, liquefied ammonia or ammoniacal liquor.
8. a kind of CFBB of the minimum discharge with three grades of desulphurization systems according to claim 6 is characterized in that: the cooling medium in described exhaust gas temperature attemperator (24) is demineralized water.
9. a kind of CFBB of the minimum discharge with three grades of desulphurization systems according to claim 6, it is characterized in that: the ignition temperature of described CFBB is 850～950 ℃.
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