CN105727731A - Desulfurization system and desulfurization method for improving boiler efficiency - Google Patents

Desulfurization system and desulfurization method for improving boiler efficiency Download PDF

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Publication number
CN105727731A
CN105727731A CN201510842227.5A CN201510842227A CN105727731A CN 105727731 A CN105727731 A CN 105727731A CN 201510842227 A CN201510842227 A CN 201510842227A CN 105727731 A CN105727731 A CN 105727731A
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China
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burner hearth
desulfurization
limestone
limestone flour
calcium
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CN201510842227.5A
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李志伟
何秀锦
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Fengyang Haitaike Energy Environmental Management Services Co ltd
Jimei University
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Fengyang Haitaike Energy Environmental Management Services Co ltd
Jimei University
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Priority to CN201510842227.5A priority Critical patent/CN105727731A/en
Publication of CN105727731A publication Critical patent/CN105727731A/en
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Abstract

The invention provides a desulfurization system and a desulfurization method for improving boiler efficiency. Two kinds of limestone powders, of which the average particle sizes are respectively approximate to 500 [mu]m and 100 [mu]m, are fed into a furnace hearth through a coal conveyor and a powder transporting pipe, wherein the total flow rate of the two limestone powders to the calcium-sulfur molar ratio of the coal burning quantity is higher than 0.5. The two limestone powders absorb heat in the furnace hearth and are calcined and decomposed into calcium oxide for desulfurization. Recycled ash captured by a cyclone separator and a part of fly ash collected in a dust remover are fed back into the furnace hearth, wherein the calcium oxide participates in the desulfurization reaction and in-furnace desulfurization efficiency is higher than 20%. During the in-furnace desulfurization, the total heat absorption quantity of calcination and decomposition of the two limestone powders is less than the heat release quantity of converting SO2 into calcium sulfate, so that the in-furnace desulfurization process increases the efficiency of the boiler. A desulfurization column is arranged outside the furnace to complete flue gas desulfurization and further achieve qualified emission of SO2. The system and the method solve the problems of reduced boiler efficiency due to high calcium-sulfur molar ratio and limestone calcination heat absorption capacity in a conventional in-furnace desulfurization process, and have significant energy-saving and emission-reducing effect.

Description

Improve desulphurization system and the method for boiler efficiency
Technical field
The present invention relates to desulfuration field, particularly to a kind of desulphurization system improving boiler efficiency and method.
Background technology
The SO2 of coal-burning boiler discharges present situation: containing certain sulphur content in fire coal, these sulphur content are largely converted into SO2 in fired coal combustion process, if not being controlled by, by being one of main atmosphere pollution with fume emission to air causes acid rain, SO2, ecology being worked the mischief.The country that China is is main energy sources with fire coal, coal-fired proportion in the energy resource structure of China is up to more than 60%, China is caused serious atmosphere polluting problem by coal fire discharged SO2, especially the southeastern coastal areas and southwest, and the acid rain problem that SO2 discharge causes is serious.In order to solve China's atmospheric pollution serious problems, national environmental protection portion has formulated " thermal power plant's Air Pollutant Emission controls standard ", and standard No. GB13223-2011, the SO2 concentration of emission of coal fired boiler of power plant is greatly improved requirement by this standard.According to sulfur content situation coal-fired at present, originally the coal-fired power plant being fitted without desulfurization equipment needs to install desulfurization equipment, and major part is mounted with that the coal-fired power plant of desulfurization equipment needs original desulfurization equipment is carried out upgrading, it is necessary to reach higher desulfuration efficiency and could meet the emission request of SO2.
The circulating fluid bed boiler desulfurization state of the art: the boiler user of surging stimulation boiler user, the particularly thermal power plant of burned coal price uses the low price coal that calorific value is low, sulfur content is high, CFBB is as a kind of cleaning combustion devices, it is particularly suitable for using above-mentioned fuel, popularization and application on a large scale are obtained, according to incompletely statistics in China.The CFBB of various capacity being on active service in China is more than 3000.
Traditional circulating fluid bed boiler desulfurization technique is that agstone is delivered to burner hearth, and agstone calcining generates calcium oxide, reacts generation calcium sulfate with the SO2 of fired coal combustion release, it is achieved the purpose of desulfurization.If the emission request of SO2 is not high, the consumption of agstone is not as big, is typically in when calcium to sulphur mole ratio is not more than 2.5 can reaching the desulfuration efficiency of 80%, and the concentration of emission of SO2 disclosure satisfy that the requirement of qualified discharge.But, day by day harsh along with SO2 emission request, the SO2 concentration of emission of current common demands station boiler reaches below 200mg/Nm3, it is desirable to desulfuration efficiency reaches more than 95%, if burning high sulfur coal, desulfuration efficiency is even as high as more than 98%.So high desulfuration efficiency, if or adopt interpolation agstone desulfurization in stove, the consumption of agstone must be increased considerably, calcium to sulphur mole ratio is even as high as 4-5, not only cause large quantities of lime stone powder not to be utilized effectively and cause waste, large quantities of lime stone powder is calcined in stove to be needed to absorb substantial amounts of heat, causes that boiler efficiency reduces.Fire coal for the Hibisci Mutabilis colliery in Sichuan Province, coal-fired As-received sulfur content is 4.05%, low heat valve is 4739Kcal/kg, when not taking desulfurization measure, SO2 concentration of emission is 11240mg/Nm3, meeting the environment protection emission requirement of SO2 concentration of emission 200mg/Nm3, desulfuration efficiency needs up to more than 98.3%.If only with spraying agstone desulfurization in stove, calcium to sulphur mole ratio calculates with 4, for the coal-burning boiler boiler that 300,000 kilowatts of generating sets are supporting, coal-fired consumption hourly is 149 tons, agstone consumption hourly is 75.6 tons, when desulfuration efficiency is 98.3%, the calcining caloric receptivity of agstone is much larger than the thermal discharge of desulphurization reaction, agstone calcining caloric receptivity and the difference of desulphurization reaction thermal discharge account for the 1.6% of coal-fired input heat, namely add substantial amounts of agstone in boiler and cause that boiler efficiency reduces by 1.6%.The limestone throwing in up to 75.6 tons in boiler per hour causes serious consequence: boiler heating surface serious wear, the operating load of agstone induction system, ash discharge facility and cleaner unit increases considerably, and fault rate and the operation and maintenance cost of these facilities increase considerably.
If in order to avoid occurring the problems referred to above not adopt interpolation agstone desulfurization in stove, only with external desulfurzation tower desulfurization, will result in heated surface at the end of boiler generation cold end corrosion.Containing a large amount of steam in coal-fired flue-gas, flue gas containing high concentration SO 2 is flowing through the low temperature heating surface of boiler back end ductwork, when the surface temperature of heating surface is lower than acid dew point, SO2 is combined with steam and forms the sour surface revealed and condense in low temperature heating surface, make low temperature heating surface quickly occur cold end corrosion to reveal, work the mischief to the safe and stable operation of boiler.
Summary of the invention
The technical problem to be solved is to provide a kind of desulphurization system improving boiler efficiency and method, overcome the calcium to sulphur mole ratio that in traditional burner, sulfur removal technology exists big, the limestone calcination excessive problem causing boiler efficiency to reduce of caloric receptivity, rubble limestone flour and microlith limestone flour are calcined heat absorption in burner hearth and resolve into calcium oxide for desulfurization, the part flying dust that the circulating ash of cyclone separator trapping and cleaner unit are collected returns burner hearth, desulfuration in furnace process generates the thermal discharge caloric receptivity more than rubble limestone flour and the calcining and decomposing of microlith limestone flour of calcium sulfate, desulfuration in furnace process is made to improve boiler efficiency, flue gas desulfurization is completed further by the desulfurizing tower arranged outside stove, SO2 discharge is made to meet requirement.
The technical solution used in the present invention is as follows:
A kind of desulphurization system improving boiler efficiency, including burner hearth, cyclone separator, desulfurizing tower, it is characterized in that: the charging aperture of described burner hearth is connected with coal bunker and thick limestone powder bin by coal conveyor, the charging aperture of burner hearth is connected with thin limestone powder bin by duff pipe, the charging aperture of burner hearth is connected with cleaner unit by feed back pipe, the charging aperture of burner hearth is connected with cyclone separator by material returning device, the outlet of burner hearth is connected with the import of cyclone separator, the outlet of cyclone separator is connected with the import of back-end ductwork, the outlet of back-end ductwork is connected with the import of cleaner unit, the outlet of cleaner unit is connected with the import of desulfurizing tower, the outlet of desulfurizing tower is connected with chimney.
Preferably, the desulphurization system of described raising boiler efficiency, it is characterised in that: the ash discharging hole of described cleaner unit is connected with allotter, and allotter is connected with burner hearth and Hui Ku respectively.
Preferably, the desulphurization system of described raising boiler efficiency, it is characterised in that: the import of described desulfurizing tower is also connected with desulfurizing agent tank.
Preferably, the desulphurization system of described raising boiler efficiency, it is characterised in that: described thin limestone powder bin bottom arranges batcher, and batcher import is connected with pressure fan.
A kind of sulfur method based on claim 1 system, it is characterised in that comprise the following steps: the fire coal containing certain sulphur content enters hearth combustion by coal conveyor and produces flue gas, and major part element sulphur is oxidized to SO2 and enters in flue gas;Rubble limestone flour in thick limestone powder bin enters burner hearth by coal conveyor, the microlith limestone flour that compression air from pressure fan carries thin limestone powder bin and provides enters burner hearth by duff pipe, calcination reaction is there is in rubble limestone flour and microlith limestone flour in burner hearth, resolve into CaO and CO2, and absorb heat;Flue gas in burner hearth carries coal ash, uncompleted burned carbon and calcium oxide particle and together leaves burner hearth entrance cyclone separator, and cyclone separator is recycled to burner hearth by being used as circulating ash under the granule capturing of more than 99.5% in flue gas by material returning device;The flue gas leaving cyclone separator and the remainder flying dust carried thereof enter back-end ductwork, and reduce to heat exchanger heat release, temperature, enter cleaner unit afterwards, flying dust more than 99.5% is collected by cleaner unit, it is collected the flying dust containing certain calcia concentration got off, a part of flying dust returns to burner hearth through feed back pipe, and another part delivers to ash storehouse, and the two allocation proportion is by allotter control;The flue gas leaving cleaner unit enters the further desulfurization of desulfurizing tower, desulfurizing agent tank provide desulfurizing agent to desulfurizing tower, and the flue gas meeting environment protection emission requirement after desulfurization leaves desulfurizing tower, through smoke stack emission;Rubble limestone flour and microlith limestone flour decompose generation calcium oxide in burner hearth, trapping through cyclone separator is sent in the circulating ash of burner hearth containing calcium oxide, cleaner unit is collected the allocated device and is recycled in the flying dust of burner hearth containing calcium oxide, these calcium oxide participate in desulphurization reaction in burner hearth, generate calcium sulfate, and discharge certain heat.
nullPreferably,Described sulfur method,It is characterized in that: the mean diameter of described rubble limestone flour is close to 500 μm,The mean diameter of microlith limestone flour is close to 100 μm,Rubble limestone flour and catabolite thereof the time of staying in burner hearth than microlith limestone flour and catabolite thereof the time of staying in burner hearth more than more than 10 times,Rubble limestone flour flow and coal-fired flow-control at calcium to sulphur mole ratio more than 0.3,Based on desulphurization control mode,Microlith limestone flour flow and coal-fired flow-control at calcium to sulphur mole ratio below 0.2,As fine desulphurization control mode,The circulating ash that cyclone separator traps returns to burner hearth,Containing calcium oxide in circulating ash,It it is the necessary means of desulphurization control,But actively control cannot be realized in boiler operatiopn,What cleaner unit was collected is recycled in the flying dust of burner hearth containing calcium oxide,The calcium oxide fleeing from cyclone separator is recycled to burner hearth again,And this part cinder reinjection ratio to burner hearth can be controlled,Make up the deficiency that cyclone separator can not actively control;After the flying dust entrance burner hearth that circulating ash and the removing dust device of cyclone separator trapping are collected, the calcium oxide in these circulating ash and flying dust can directly participate in desulphurization reaction, it is not necessary to limestone calcination institute calorific requirement.
Preferably, described sulfur method, it is characterized in that: the calcium to sulphur mole ratio of the total flow of described rubble limestone flour and microlith limestone flour and coal-fired flow is more than 0.5, rubble limestone flour, microlith limestone flour, the calcium oxide of circulating ash and cinder reinjection realize desulfurization in burner hearth jointly to the calcium oxide of burner hearth, wherein rubble limestone flour and microlith limestone flour need heat absorption in calcining and decomposing process, the calcining caloric receptivity of every mole of calcium carbonate is 184kJ, in sweetening process, the release heat being generated calcium sulfate by every mole of SO2 is 486kJ, desulfuration efficiency in burner hearth is more than 20%, guarantee that desulphurization reaction the discharged heat caloric receptivity more than rubble limestone flour and microlith limestone flour calcining and decomposing occurs these desulfurizing agents in burner hearth, guarantee that sweetening process makes boiler efficiency increase.
Preferably, described sulfur method, it is characterised in that: described in leave the flue gas of cleaner unit and enter into desulfurizing tower, carry out desulfurization again, SO2 in elimination flue gas, makes the SO2 concentration leaving in the flue gas of desulfurizing tower lower than a certain certain concentration, meets the emission request of SO2.
Compared with the prior art, beneficial effects of the present invention is as follows:
1) compared with traditional desulfuration in furnace technique, the invention have the benefit that the calcium to sulphur mole ratio that desulfuration in furnace is greatly lowered, make the thermal discharge caloric receptivity more than agstone calcination reaction of calcium oxide desulphurization reaction in desulfuration in furnace process, sweetening process not only achieves desulfurization purpose, is also effectively increased boiler efficiency.
(2) compared with traditional simple employing microlith limestone flour sulfur removal technology, desulfuration in furnace technique of the present invention adopts the desulfuration in furnace technique that rubble limestone flour combines with microlith limestone flour, rubble limestone flour sends into burner hearth by coal conveyor, microlith limestone flour is used for accurate desulphurization control, reduce the microlith limestone flour consumption adopting pneumatic conveying mode, save the power consumption of compression air consumption and air compressor machine;Rubble limestone flour utilizes coal conveyor conveying more reliable, and failure rate is low reduces the fault rate of agstone induction system, improves the reliability of desulphurization system, reduces SO2 discharge beyond standards risk.
(3) compared with traditional simple employing microlith limestone flour sulfur removal technology, desulfuration in furnace technique of the present invention adopts the desulfuration in furnace technique that rubble limestone flour combines with microlith limestone flour, rubble limestone flour participates in the time of desulphurization reaction much larger than microlith limestone flour in stove, when identical desulfuration efficiency, calcium to sulphur mole ratio needed for desulfuration in furnace of the present invention is greatly lowered, reduce the consumption of agstone, effectively reduce agstone calcining caloric receptivity, be conducive to improving boiler efficiency.
(4) further, current desulfuration in furnace technique calcium oxide for fleeing from cyclone separator mostly utilizes cleaner unit to collect and outer row, the present invention utilizes the flying dust containing finite concentration calcium oxide that a part of cleaner unit is collected, and it is recycled to burner hearth, utilize the calcium oxide desulfurization in this part flying dust, improve limestone utilization and desulfuration efficiency, utilize this partial oxidation calcium desulfurizing, save the calcining caloric receptivity of limestone, improve boiler efficiency further.
(5) further, the present invention utilizes the sulfur removal technology that desulfuration in furnace and external desulfurzation combine, while improve boiler efficiency, also effectively reduce the SO2 concentration flowing through in the flue gas of the low temperature heating surface in back-end ductwork, it is prevented effectively from low temperature heating surface generation cold end corrosion, reduce the fault rate of boiler, improve the safe operation cycle of boiler.
(6) further, while the present invention realizes desulfurization, improve boiler efficiency, there is significant effects of energy saving and emission reduction.
Accompanying drawing explanation
Fig. 1 is the workflow schematic diagram of the present invention.
1-pressure fan, 2-batcher, 3-duff pipe, 4-burner hearth, 5-material returning device, 6-feed back pipe, 7-allotter, 8-ash storehouse, 9-desulfurizing agent tank, 10-chimney, 11-desulfurizing tower, 12-cleaner unit, 13-back-end ductwork, 14-heat exchanger, 15-cyclone separator, 16-coal bunker, the thick limestone powder bin of 17-, 18-batcher, 19-coal conveyor, the thin limestone powder bin of 20-.
Detailed description of the invention
Present pre-ferred embodiments is provided, to describe technical scheme in detail below in conjunction with accompanying drawing.
nullAs shown in drawings,Improve desulphurization system and the method for boiler efficiency,The charging aperture of burner hearth (4) is connected with coal bunker (16) and thick limestone powder bin (17) by coal conveyor (19),The charging aperture of burner hearth (4) is connected with thin limestone powder bin (20) by duff pipe (3),The charging aperture of burner hearth (4) is connected with cleaner unit (12) by feed back pipe (6),The charging aperture of burner hearth (4) is connected with cyclone separator (15) by material returning device (5),The outlet of burner hearth (4) is connected with the import of cyclone separator (15),The outlet of cyclone separator (15) is connected with the import of back-end ductwork (13),The outlet of back-end ductwork (13) is connected with the import of cleaner unit (12),The outlet of cleaner unit (12) is connected with the import of desulfurizing tower (11),The outlet of desulfurizing tower (11) is connected with chimney (10).The ash discharging hole of cleaner unit (12) is connected with allotter (7), and allotter (7) is connected with burner hearth (4) and ash storehouse (8) respectively.The import of desulfurizing tower (11) is also connected with desulfurizing agent tank (9).Thin limestone powder bin (20) bottom arranges batcher (2), and batcher (2) import is connected with pressure fan (1).
The job step of the present invention is: the fire coal containing certain sulphur content enters burner hearth (4) burning by coal conveyor (19) and produces flue gas, and major part element sulphur is oxidized to SO2 and enters in flue gas;Rubble limestone flour in thick limestone powder bin (17) enters burner hearth (4) by coal conveyor (19), the microlith limestone flour that compression air from pressure fan (1) carries thin limestone powder bin (20) and provides enters burner hearth by duff pipe (3), calcination reaction is there is in rubble limestone flour and microlith limestone flour in burner hearth (4), resolve into CaO and CO2, and absorb heat;Flue gas in burner hearth (4) carries coal ash, uncompleted burned carbon and calcium oxide particle and together leaves burner hearth (4) entrance cyclone separator (15), and cyclone separator (15) is recycled to burner hearth (4) by being used as circulating ash under the granule capturing of more than 99.5% in flue gas by material returning device (5);The flue gas leaving cyclone separator (15) and the remainder flying dust carried thereof enter back-end ductwork (13), and reduce to heat exchanger (14) heat release, temperature, enter cleaner unit (12) afterwards, flying dust more than 99.5% is collected by cleaner unit (12), it is collected the flying dust containing certain calcia concentration got off, a part of flying dust returns to burner hearth (4) through feed back pipe (6), and another part delivers to ash storehouse (8), and the two allocation proportion is controlled by allotter (7);The flue gas leaving cleaner unit (12) enters desulfurizing tower (11) desulfurization further, desulfurizing agent tank (9) provide desulfurizing agent to desulfurizing tower (11), and the flue gas meeting environment protection emission requirement after desulfurization leaves desulfurizing tower (11), discharges through chimney (10);Rubble limestone flour and microlith limestone flour decompose generation calcium oxide in burner hearth (4), trap in the circulating ash being sent to burner hearth (4) containing calcium oxide through cyclone separator (15), cleaner unit (12) is collected during the allocated device (7) is recycled in the flying dust of burner hearth (4) containing calcium oxide, these calcium oxide participate in desulphurization reaction in burner hearth, generate calcium sulfate, and discharge certain heat.
nullFurther,The mean diameter of rubble limestone flour is close to 500 μm,The mean diameter of microlith limestone flour is close to 100 μm,Rubble limestone flour and the catabolite time of staying in burner hearth (4) thereof than microlith limestone flour and catabolite thereof the time of staying in burner hearth (4) more than more than 10 times,Rubble limestone flour flow and coal-fired flow-control at calcium to sulphur mole ratio more than 0.3,Based on desulphurization control mode,Microlith limestone flour flow and coal-fired flow-control at calcium to sulphur mole ratio below 0.2,As fine desulphurization control mode,The circulating ash that cyclone separator (15) traps returns to burner hearth (4),Containing calcium oxide in circulating ash,It it is the necessary means of desulphurization control,But actively control cannot be realized in boiler operatiopn,Containing calcium oxide in the flying dust being recycled to burner hearth (4) that cleaner unit (12) is collected,The calcium oxide fleeing from cyclone separator (15) is recycled to burner hearth (4) again,And this part cinder reinjection ratio to burner hearth can be realized,Make up the deficiency that cyclone separator (15) can not actively control;After the flying dust that the circulating ash trapped through cyclone separator (15) and removing dust device (12) are collected enters burner hearth (4), the calcium oxide in these circulating ash and flying dust can directly participate in desulphurization reaction, it is not necessary to limestone calcination institute calorific requirement.
Further, the flue gas leaving cleaner unit (12) enters into desulfurizing tower (11), carries out desulfurization, the SO2 in elimination flue gas again, makes the SO2 concentration leaving in the flue gas of desulfurizing tower (11) lower than a certain certain concentration, meet the emission request of SO2.

Claims (8)

1. the desulphurization system improving boiler efficiency, including burner hearth, cyclone separator, desulfurizing tower, it is characterized in that: the charging aperture of described burner hearth is connected with coal bunker and thick limestone powder bin by coal conveyor, the charging aperture of burner hearth is connected with thin limestone powder bin by duff pipe, the charging aperture of burner hearth is connected with cleaner unit by feed back pipe, the charging aperture of burner hearth is connected with cyclone separator by material returning device, the outlet of burner hearth is connected with the import of cyclone separator, the outlet of cyclone separator is connected with the import of back-end ductwork, the outlet of back-end ductwork is connected with the import of cleaner unit, the outlet of cleaner unit is connected with the import of desulfurizing tower, the outlet of desulfurizing tower is connected with chimney.
2. the desulphurization system of raising boiler efficiency according to claim 1, it is characterised in that: the ash discharging hole of described cleaner unit is connected with allotter, and allotter is connected with burner hearth and Hui Ku respectively.
3. the desulphurization system of raising boiler efficiency according to claim 1, it is characterised in that: the import of described desulfurizing tower is also connected with desulfurizing agent tank.
4. the desulphurization system of raising boiler efficiency according to claim 1, it is characterised in that: described thin limestone powder bin bottom arranges batcher, and batcher import is connected with pressure fan.
5. the sulfur method based on claim 1 system, it is characterised in that comprise the following steps: the fire coal containing certain sulphur content enters hearth combustion by coal conveyor and produces flue gas, and major part element sulphur is oxidized to SO2 and enters in flue gas;Rubble limestone flour in thick limestone powder bin enters burner hearth by coal conveyor, the microlith limestone flour that compression air from pressure fan carries thin limestone powder bin and provides enters burner hearth by duff pipe, calcination reaction is there is in rubble limestone flour and microlith limestone flour in burner hearth, resolve into CaO and CO2, and absorb heat;Flue gas in burner hearth carries coal ash, uncompleted burned carbon and calcium oxide particle and together leaves burner hearth entrance cyclone separator, and cyclone separator is recycled to burner hearth by being used as circulating ash under the granule capturing of more than 99.5% in flue gas by material returning device;The flue gas leaving cyclone separator and the remainder flying dust carried thereof enter back-end ductwork, and reduce to heat exchanger heat release, temperature, enter cleaner unit afterwards, the flying dust more than 99.5% that flue gas carries is collected by cleaner unit, it is collected the flying dust containing certain calcia concentration got off, a part returns to burner hearth through feed back pipe, and another part delivers to ash storehouse, and the two allocation proportion is by allotter control;The flue gas leaving cleaner unit enters the further desulfurization of desulfurizing tower, desulfurizing agent tank provide desulfurizing agent to desulfurizing tower, and the flue gas meeting environment protection emission requirement after desulfurization leaves desulfurizing tower, through smoke stack emission;Rubble limestone flour and microlith limestone flour decompose generation calcium oxide in burner hearth and participate in desulphurization reaction, part has neither part nor lot in the calcium oxide of desulphurization reaction and is trapped by cyclone separator and cleaner unit respectively, and along with circulating ash and flying dust return to burner hearth, this partial oxidation calcium again participates in desulphurization reaction in burner hearth and generates calcium sulfate, and discharges certain heat.
null6. sulfur method according to claim 5,It is characterized in that: the mean diameter of described rubble limestone flour is close to 500 μm,The mean diameter of microlith limestone flour is close to 100 μm,Rubble limestone flour and catabolite thereof the time of staying in burner hearth than microlith limestone flour and catabolite thereof the time of staying in burner hearth more than more than 10 times,Rubble limestone flour flow and coal-fired flow-control at calcium to sulphur mole ratio more than 0.3,Based on desulphurization control mode,Microlith limestone flour flow and coal-fired flow-control at calcium to sulphur mole ratio below 0.2,As fine desulphurization control mode,The circulating ash that cyclone collection gets off returns to burner hearth,Containing calcium oxide in circulating ash,It it is the necessary means of desulphurization control,But actively control cannot be realized in boiler operatiopn,What cleaner unit was collected is recycled in the flying dust of burner hearth containing calcium oxide,The calcium oxide fleeing from cyclone separator is recycled to burner hearth again,And the ratio controlling this part cinder reinjection to burner hearth can be realized,Make up the deficiency that cyclone separator can not actively control;After the flying dust entrance burner hearth that circulating ash and the removing dust device of cyclone separator trapping are collected, the calcium oxide in these circulating ash and flying dust can directly participate in desulphurization reaction, it is not necessary to limestone calcination institute calorific requirement.
7. sulfur method according to claim 5, it is characterized in that: the calcium to sulphur mole ratio of the total flow of described rubble limestone flour and microlith limestone flour and coal-fired flow is more than 0.5, rubble limestone flour, microlith limestone flour, the calcium oxide of circulating ash and cinder reinjection realize desulfurization in burner hearth jointly to the calcium oxide of burner hearth, wherein rubble limestone flour and microlith limestone flour need heat absorption in calcining and decomposing process, the calcining caloric receptivity of every mole of calcium carbonate is 184kJ, in sweetening process, the release heat being generated calcium sulfate by every mole of SO2 is 486kJ, desulfuration efficiency in burner hearth is more than 20%, guarantee that desulphurization reaction the discharged heat caloric receptivity more than rubble limestone flour and microlith limestone flour calcining and decomposing occurs these desulfurizing agents in sweetening process, guarantee that sweetening process makes boiler efficiency increase.
8. sulfur method according to claim 5, it is characterized in that: described in leave the flue gas of cleaner unit and enter into desulfurizing tower, carry out desulfurization, the SO2 in elimination flue gas again, make the SO2 concentration leaving in the flue gas of desulfurizing tower lower than a certain certain concentration, meet the emission request of SO2.
CN201510842227.5A 2015-11-29 2015-11-29 Desulfurization system and desulfurization method for improving boiler efficiency Pending CN105727731A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109058983A (en) * 2018-06-01 2018-12-21 西安交通大学 Recirculating fluidized bed combustion with meagre oxygen catalysis oxidation fractional combustion boiler system and method
CN110624376A (en) * 2019-09-29 2019-12-31 山西大学 Furnace desulfurization system with micro-oxidation, high mass transfer and quick response of circulating fluidized bed

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109058983A (en) * 2018-06-01 2018-12-21 西安交通大学 Recirculating fluidized bed combustion with meagre oxygen catalysis oxidation fractional combustion boiler system and method
CN110624376A (en) * 2019-09-29 2019-12-31 山西大学 Furnace desulfurization system with micro-oxidation, high mass transfer and quick response of circulating fluidized bed

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