CN204554801U - Circulating fluid bed boiler secondary air hierarchical arrangement system - Google Patents
Circulating fluid bed boiler secondary air hierarchical arrangement system Download PDFInfo
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- CN204554801U CN204554801U CN201520215241.8U CN201520215241U CN204554801U CN 204554801 U CN204554801 U CN 204554801U CN 201520215241 U CN201520215241 U CN 201520215241U CN 204554801 U CN204554801 U CN 204554801U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model discloses circulating fluid bed boiler secondary air hierarchical arrangement system, comprise circulating fluid bed boiler body, primary air system is connected with bottom circulating fluid bed boiler body, primary air system comprises the first blower fan, first blower fan is connected with circulating fluid bed boiler body by airduct, circulating fluid bed boiler body lower sides is connected with secondary air system, secondary air system comprises high efficient secondary wind system and lower secondary air system, the spout of described high efficient secondary wind system is positioned at above the spout of lower secondary air system, high efficient secondary wind system comprises the second blower fan, second blower fan is connected with circulating fluid bed boiler body by airduct, lower secondary air system comprises the 3rd blower fan, 3rd blower fan is connected with circulating fluid bed boiler body by airduct, first blower fan, second blower fan and the 3rd blower fan export wind and all heat through air preheater.By reasonable Arrangement secondary air system, make stove internal classification combustion efficiency obvious, reduce pollutant emission, economize energy.
Description
Technical field
The utility model relates to Sector of Cfb Boilers, particularly the secondary air system of CFBB, specifically refers to circulating fluid bed boiler secondary air hierarchical arrangement system.
Background technology
Combustion technology of circulating fluidized, with its energy-conserving and environment-protective advantage, is developed for nearly 30 years greatly.In September, 2014, National Development and Reform Committee, Chinese Ministry of Environmental Protection and ministries and commissions of National Energy Board three combine and issue " coal electricity energy-saving and emission-reduction upgrading and transformation action plan (2014-the year two thousand twenty) ", require that newly-built coal unit is close or substantially reach discharge of gas turbine limit value, this makes to realize stove combustion process direct desulfurization and low-temperature burning can effectively suppress the CFBB of NO_x formation also to have much pressure.
For reducing boiler pollutant discharge value further, needing the combustion characteristics regulating boiler, thus on source, forcing down the growing amount of contaminant gases as possible.Secondary Air is one of important means regulating burning in circulating fluid bed boiler characteristic.Research shows, Secondary Air hierarchical arrangement, can build reducing atmosphere in stove, effectively can suppress NO_x formation.Though existing circulating fluid bed boiler secondary air is divided into two stage arrangement usually, due to close together between upper and lower Secondary Air, grading effect is also not obvious.In order to increase this grading effect, can realize by reasonably improving upper Secondary Air position, but actual Secondary Air pipe network system is set time, if only simply raise the nozzle exit area of Secondary Air, then most Secondary Air can be caused all to enter burner hearth from the upper Secondary Air that resistance is less because of upper and lower Secondary Air resistance difference, same Secondary Air air quantity at present significantly reduces, thus emulsion zone disturbance is weakened and is unfavorable for that the after-flame of fuel, dilute-phase zone granule density reduce and be unfavorable for that heating surface conducts heat, and cannot reach re-set target.
Be disclose a kind of circulating fluid bed boiler secondary air pipe in the utility model patent of 201120472448.5 in the patent No., avoid dust larger for particle to be brought to the wearing and tearing that heat-transfer surface causes by reducing primary air flow, and reduce secondary air channel quantity, what increase Secondary Air enters stove wind speed, thus increases its rigidity.Owing to arranging 3 ~ 5 airducts, be therefore difficult to the demand for development adapting to large-scale power station CFBB.
Be in 200920033464.7 utility model patents, disclose a kind of boiler hearth of circulating fluidized bed center air supply device in the patent No., special center air supply device in burner hearth is goed deep into the direct air feed in oxygen-depleted zone, burner hearth center by arranging, burner hearth center air feed situation can be improved, improve boiler combustion efficiency, but center air supply device is arranged in burner hearth and likely causes the problem that near the air supply device of center, sulfuration is insufficient, and center air supply device is set in burner hearth also there is very large difficulty, it is concrete that to implement difficulty very large.
Be in the patent of invention of 200810017240.7 in the patent No., disclose a kind of supplying secondary air to indent type circulating fluidized bed method and device thereof, wall near lower furnace portion overfire air port is recessed to burner hearth, make Secondary Air for wind snout have from burner hearth center more close to position to air feed in burner hearth, for improving the oxygen concentration field distribution of hearth combustion central area, eliminate the phenomenon of burner hearth central area anoxic, because this structure causes burner hearth inner structure complicated, in burner hearth, material mobility is deteriorated, and occurs the situation that sulfuration is insufficient.
Be in the patent of invention of 200910157103.8 in the patent No., disclose the cross heating screen of CFBB band secondary air jet, the cross heating screen of band secondary air jet is set in boiler hearth of circulating fluidized bed, to there is provided in stove while extended surface by being with the cross heating screen of secondary air jet, for in stove, material provides blending space, and provide oxygen by overfire air port to burner hearth center, realize recirculating fluidized bed fractional combustion, reduce the discharge of nitrogen oxide NOx, because the reasons such as pipe net arrangement in implementation process cause bottom solid substance concentration in burner hearth higher, cause serious wear in burner hearth, and, cross heating screen mounting process is complicated, be difficult to implement.
To sum up, existing scheme does not all provide the simple and secondary air system scheme of effective applicable large circulating fluidized bed boiler of structure, thus limits CFBB towards more high parameter, more low energy consumption and more clean future development.
Utility model content
The purpose of this utility model is to provide a kind of circulating fluid bed boiler secondary air hierarchical arrangement system, the deficiency that existing equipment exists can be improved, overcoming existing equipment upper and lower Secondary Air resistance difference causes most Secondary Air all to enter burner hearth from the upper Secondary Air that resistance is less, significantly reducing with Secondary Air air quantity at present makes emulsion zone disturbance weaken and be unfavorable for the after-flame of fuel, dilute-phase zone granule density reduces and is unfavorable for that heating surface conducts heat, the defects such as re-set target cannot be reached, by reasonable Arrangement secondary air system, make stove internal classification combustion efficiency more obvious, reduce pollutant emission, economize energy.
The utility model is achieved through the following technical solutions:
A kind of circulating fluid bed boiler secondary air hierarchical arrangement system, comprise circulating fluid bed boiler body, primary air system is connected with bottom described circulating fluid bed boiler body, described primary air system comprises the first blower fan, described first blower fan is connected with circulating fluid bed boiler body by airduct, described circulating fluid bed boiler body lower sides is connected with secondary air system, described secondary air system comprises high efficient secondary wind system and lower secondary air system, the spout of described high efficient secondary wind system is positioned at above the spout of lower secondary air system, described high efficient secondary wind system comprises the second blower fan, described second blower fan is connected with circulating fluid bed boiler body by airduct, described lower secondary air system comprises the 3rd blower fan, described 3rd blower fan is connected with circulating fluid bed boiler body by airduct, described first blower fan, second blower fan and the 3rd blower fan export wind and all heat through air preheater.
Compare the existing mode being adjusted First air and Secondary Air by a Fans adjustment valve opening and the mode of pipe diameter, the utility model is by being provided with the primary air system of the first blower fan for carrying the First air carrying coal dust, material in stove is made to be in good fluidized state, simultaneously for fuel combustion provides partial oxidation, and the carry heat that fuel combustion produces is reached upper furnace from the bed of material and carries out heat exchange, realize boiler combustion heat balance.Secondary air system is set to high efficient secondary wind system and lower secondary air system by the utility model, and adopt the second blower fan to be that high efficient secondary wind system is to wind, the 3rd blower fan is adopted to be that lower secondary air system is to wind, realize respectively to wind, can realize, to the adjustment of air quantity, realizing convenient adjustment high efficient secondary wind system and lower secondary air system spout back pressure, reducing overfire air fan pressure head by the mode of independent adjustment the second blower fan or the 3rd blower fan simultaneously, reduce power consumption, economize energy.
Due to high efficient secondary wind system is arranged on above lower Secondary Air, the burning of stove internal classification can be realized, the formation of further suppression nitrogen oxide, thus reduction pollutant emission, by adjusting separately blower fan to air quantity, that improves high efficient secondary wind in stove penetrates effect, can take a tonic or nourishing food to build up one's health oxygen-depleted zone, burner hearth center, be beneficial to the desulfurized effect improved further in efficiency of combustion and stove, make total environmental protection more.
Further, when described air preheater is rotary preheater, described air preheater divides quantity >=4, storehouse.By adopting the rotary preheater in many points of storehouses, be beneficial to the air leak rate of air curtain reducing rotary regenerative air preheater.
Further, when described air preheater is tubular preheater, stream air in the heating surface tube of described air preheater, air duct quantity >=3.By adopting multichannel tubular preheater, the normal use of guarantee high efficient secondary wind system.
Further, the airduct of high efficient secondary wind system is connected by adjustable baffle plate with the airduct of lower secondary air system.When being in the special operation conditions such as underload when boiler, open described baffle plate, high efficient secondary wind system is connected with lower secondary air system, now only open high efficient secondary wind system and can meet boiler secondary wind system wind, economize energy.
The utility model compared with prior art, has following beneficial effect:
(1) the utility model is by being arranged on circulating fluid bed boiler body lower sides by secondary air system, and be placed on above primary air system, by arranging high efficient secondary wind system and lower secondary air system, improve stove internal classification combustion efficiency, NO_x formation can be suppressed further, reduce pollutant emission from source;
(2) the utility model is by reasonable Arrangement secondary air system, and what can ensure the high efficient secondary wind of boiler penetrates effect, to the effective oxygenating in oxygen-depleted zone, burner hearth center, can be beneficial to and improve efficiency of combustion and desulfuration in furnace effect further;
(3) the utility model is by being placed in above primary air system and lower secondary air system by high efficient secondary wind system, high efficient secondary wind snout back pressure can be reduced, simultaneously to high efficient secondary wind system and the independent blower fan air feed of lower secondary air system, contribute to reducing overfire air fan pressure head, reduce power consumption, economize energy.
Accompanying drawing explanation
Fig. 1 is pot furnace pressure cloud atlas;
Fig. 2 is the utility model overall structure schematic diagram.
Wherein: 101-circulating fluid bed boiler body; 102-air preheater; 103-the second blower fan; 104-the three blower fan; 105-the first blower fan.
Detailed description of the invention
Below in conjunction with specific embodiment, the utility model is described in further detail, but embodiment of the present utility model is not limited thereto.
In CFBB running, after burner hearth sent into by coal and desulfurizing agent, surrounded by inertia high temperature (830 DEG C-930 DEG C) material be in a large number under fluidized state immediately, fully mix, rapid ignition, carry out desulphurization reaction simultaneously; Under the effect of rising flue gas stream, hot inertia high-temperature material moves to upper furnace together with the coal grain be burning, and to other heating surface heat releases of arranging in water-cooling wall and stove, tiny pulverized coal particle completes burning and leaves burner hearth.In ascending air, after oversize grain enters suspension region, under gravity and External Force Acting, depart from primary air, thus adherent dirty, strengthen the transmission of furnace heat to working medium in heating surface.
The First air and the Secondary Air that are blown into burner hearth are all by entering burner hearth after heating, First air enters burner hearth bottom for burning for carrying coal dust through coal pulverizer, Secondary Air enters burner hearth for adjusting burning after air preheater 102 preheating, plays combustion-supporting effect.The design proportion of general First air and Secondary Air is 60-55% and 40-45%, and First air is the fluidisation ensureing material, and Secondary Air is in order to ensure the abundant mixing of oxygen amount needed for fuel combustion and material, overheavy firing.
CFBB is divided into anterior and afterbody two vertical shafts generally, anterior vertical shaft is for always to hang structure, surrounding is made up of fin panel casing, be followed successively by air compartment, emulsion zone, a dilute-phase zone from bottom to top, back-end ductwork is followed successively by high temperature superheater, low temperature superheater and economizer from top to bottom, tail vertical well adopts supporting construction, is connected between two vertical shafts by vertical cyclone separator, and separator bottom connects loop back device and ash cooler.
The utility model is using actual boiler as research object, large whirlpool model is adopted to describe fluid field in furnace, the classical Gidaspow drag force model in conjunction with Ergun and Wen-yu model is selected to describe Momentum Transfer between gas-solid, high efficient secondary wind and lower Secondary Air are simulated, pressure cloud atlas as shown in Figure 1 can be obtained.As can be seen from Figure 1, the back pressure between high efficient secondary wind and lower Secondary Air can at more than 3KPa.The economy amplitude corresponding in circulating fluid bed boiler secondary air spout position is larger, therefore, although conventional secondary air system upper and lower overfire air port spacing of arranging is nearer, but burner hearth back pressure still has the difference of 1.5 ~ 3KPa, Secondary Air is easily caused to be more prone to enter burner hearth from upper strata Secondary Air, thus making upper and lower Secondary Air proportioning off-design value, Secondary Air grading effect reduces.
For this reason, the high efficient secondary wind that the utility model adopts special blower fan to provide burner hearth back pressure lower, thus avoid uneven problem of blowing, simultaneously, because high efficient secondary wind system nozzle back pressure is lower than lower overfire air port place back pressure, therefore blower fan power consumption can be reduced, be conducive to saving power consumption, reduce unit station service, and be furnished with independently blower fan due to high efficient secondary wind system, therefore regulate when underload more autonomous, the backpressure requirements of lower secondary air system can not be considered, namely blast can be even lower, and contributes to realizing lower station service power consumption rate.Particularly CFB boiler is when partly meeting (underload) and running, due to the change of burner hearth concentrated phase area height, the back pressure difference of upper and lower Secondary Air is large, if can improve on Secondary Air pipe network and ventilator selection, then obviously can reduce blower fan power consumption when sub-load (underload) is run, thus reduction station service, reach energy-conservation object.
Embodiment 1:
This engineering is used for the unit being in higher load for a long time.In order to make Secondary Air keep certain speed and rigidity, existing equipment all adopts the method increasing secondary air channel diameter to realize adjustment, but in practical operation, adjustment secondary air channel diameter coordinates the operation of recirculating fluidized bed to be unpractical in real time.In order to ensure the penetration capacity of Secondary Air in existing equipment, Secondary Air is set to enter from the short direction of burner hearth, formed inject fire box rush by force air stream, speed is generally more than 50m/s.The Main Function of Secondary Air is air capacity needed for postcombustion burning and the back-mixing of strength imparting material, and suitably the field distribution of adjustment in-furnace temperature, makes inner flue gas of the stove Temperature Distribution more even.
As shown in Figure 2, a kind of circulating fluid bed boiler secondary air hierarchical arrangement system is disclosed in the present embodiment, comprise circulating fluid bed boiler body 101, primary air system is connected with bottom described circulating fluid bed boiler body 101, described primary air system comprises the first blower fan 105, described first blower fan 105 is connected with circulating fluid bed boiler body 101 by airduct, described circulating fluid bed boiler body 101 lower sides is connected with secondary air system, described secondary air system comprises high efficient secondary wind system and lower secondary air system, the spout of described high efficient secondary wind system is positioned at above the spout of lower secondary air system, described high efficient secondary wind system comprises the second blower fan 103, described second blower fan 103 is connected with circulating fluid bed boiler body 101 by airduct, described lower secondary air system comprises the 3rd blower fan 104, described 3rd blower fan 104 is connected with circulating fluid bed boiler body 101 by airduct, described first blower fan 105, second blower fan 103 and the 3rd blower fan 104 export wind and all heat through air preheater 102.
The First air carrying coal dust is input to bottom circulating fluid bed boiler body 101 by primary air system, for making material sulfuration, high efficient secondary wind system is arranged at above lower secondary air system, the height making high efficient secondary wind enter burner hearth improves, control into stove wind speed by the second blower fan 103 be arranged on high efficient secondary wind system respectively with the 3rd blower fan 104 be arranged on lower secondary air system, effectively can realize the proportioning of Secondary Air.Adopt and high efficient secondary wind system is arranged on above lower secondary air system, control the wind speed of the second blower fan 103 and the 3rd blower fan 104, regulate high efficient secondary wind and lower Secondary Air.Supply respectively by adopting two Fans (the second blower fan 103, the 3rd blower fan 104) respectively, Secondary Air is delivered to lower furnace portion emulsion zone, high efficient secondary wind system and lower secondary air system is made to enter in stove from differing heights respectively, play the effect that postcombustion burning required air and overheavy firing disturbance, conveying bed material move to upper furnace, and realize staged air distribution burning, reduce NOx emission, increase fuel after-flame degree.
In running, secondary air flow can be confirmed according to flue gas oxygen content, aftercombustion required air, play perturbation action, strengthen gas-particle two-phase mixing, in running, lower secondary air system blast is approximately higher than high efficient secondary wind system more than blast 2KPa, and keeping boiler oxygen amount between 3%-5%, primary air system air quantity accounts for about 55%, and secondary air system air quantity accounts for about 45%.
In the present embodiment, arrange by the way, by the second special blower fan 103 for high efficient secondary wind system provides high efficient secondary wind, thus uneven problem of blowing can be avoided.Simultaneously, the 3rd special blower fan 104 is adopted to be lower secondary air system air feed, the second blower fan 103 can be controlled and the 3rd blower fan 104 makes the back pressure of high efficient secondary wind system nozzle more much lower than the back pressure of lower secondary air system nozzle, therefore the power consumption of blower fan can be made less, be conducive to saving power consumption, reduce unit station service, and be furnished with independently the second blower fan 103 due to high efficient secondary wind system, make the adjustment when underload more autonomous, the backpressure requirements of lower secondary air system can not be considered, what namely blast can fall is lower, contribute to realizing lower station service power consumption rate.Particularly CFB boiler is when sub-load (underload) is run, due to the change of burner hearth concentrated phase area height, back pressure difference between high efficient secondary wind system and lower secondary air system strengthens, if can improve on high efficient secondary wind system and lower secondary air system pipe network and ventilator selection, then obviously can reduce blower fan power consumption when sub-load (underload) is run, thus reduction station service, reach energy-conservation object.
By reasonable Arrangement secondary air system in the present embodiment, make boiler internal high efficient secondary wind penetrate effect can to ensureing, can realize the effective oxygenating in oxygen-depleted zone, burner hearth center, be conducive to improving the desulfurized effect in efficiency of combustion and burner hearth.
Embodiment 2:
The present embodiment is used for the unit of frequent peak regulation.Circulating fluid bed boiler body 101 is input to because the first blower fan 105, second blower fan 103 and the 3rd blower fan 104 export after wind is all heated by air preheater 102, and easily there is higher air leakage phenomena under normal circumstances in existing air preheater 102, in the present embodiment, in order to improve the problems referred to above, described air preheater 102 is rotary preheater, quantity >=4, described air preheater 102 points of storehouses, are beneficial to and reduce total air leak rate of air curtain.
Rotary preheater is used for relatively large unit, advantages such as there is compact conformation, volume is little, heat-transfer surface density is high, overall mass is light, metal consumption is few, be beneficial to mounting arrangements, cold end corrosion is lighter, the utility model adopts at least 4 points of storehouses, point storehouse that pressure can be provided placed in the middle for high efficient secondary wind system, reduces the air leak rate of air curtain of rotary preheater.
When boiler is at special operation conditions such as underloads, open the baffle plate of high efficient secondary wind system and lower secondary air system, high efficient secondary wind system is connected with lower secondary air system, now only opens high efficient secondary wind system and can meet boiler secondary wind system wind, thus economize energy.
Claims (4)
1. circulating fluid bed boiler secondary air hierarchical arrangement system, comprise circulating fluid bed boiler body (101), it is characterized in that: be connected with primary air system in described circulating fluid bed boiler body (101) bottom, described primary air system comprises the first blower fan (105), described first blower fan (105) is connected with circulating fluid bed boiler body (101) by airduct, described circulating fluid bed boiler body (101) lower sides is connected with secondary air system, described secondary air system comprises high efficient secondary wind system and lower secondary air system, the spout of described high efficient secondary wind system is positioned at above the spout of lower secondary air system, described high efficient secondary wind system comprises the second blower fan (103), described second blower fan (103) is connected with circulating fluid bed boiler body (101) by airduct, described lower secondary air system comprises the 3rd blower fan (104), described 3rd blower fan (104) is connected with circulating fluid bed boiler body (101) by airduct, described first blower fan (105), second blower fan (103) and the 3rd blower fan (104) export wind and all heat through air preheater (102).
2. circulating fluid bed boiler secondary air hierarchical arrangement system according to claim 1, is characterized in that: described air preheater (102) is rotary preheater, described air preheater (102) point quantity >=4, storehouse.
3. circulating fluid bed boiler secondary air hierarchical arrangement system according to claim 1, is characterized in that: described air preheater (102) is tubular preheater, stream air in the heating surface tube of described air preheater (102), air duct quantity >=3.
4. circulating fluid bed boiler secondary air hierarchical arrangement system according to claim 1, is characterized in that: the airduct of high efficient secondary wind system is connected by adjustable baffle plate with the airduct of lower secondary air system.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106402845A (en) * | 2016-10-28 | 2017-02-15 | 杭州红山热电有限公司 | Boiler burning system |
| CN108240621A (en) * | 2017-09-05 | 2018-07-03 | 李建锋 | Circulating fluid bed boiler secondary air system |
| CN108442986A (en) * | 2018-04-26 | 2018-08-24 | 东方电气集团东方锅炉股份有限公司 | A kind of combustion gas and the double coupled electricity-generation method and system of Thermal generation unit |
| CN111396865A (en) * | 2020-04-16 | 2020-07-10 | 东方电气集团东方锅炉股份有限公司 | High-efficient air feed system and circulating fluidized bed boiler thereof |
| CN112443833A (en) * | 2019-09-05 | 2021-03-05 | 中国科学院工程热物理研究所 | Pulverized coal fired boiler with bottom burner and control method thereof |
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2015
- 2015-04-10 CN CN201520215241.8U patent/CN204554801U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106402845A (en) * | 2016-10-28 | 2017-02-15 | 杭州红山热电有限公司 | Boiler burning system |
| CN108240621A (en) * | 2017-09-05 | 2018-07-03 | 李建锋 | Circulating fluid bed boiler secondary air system |
| CN108442986A (en) * | 2018-04-26 | 2018-08-24 | 东方电气集团东方锅炉股份有限公司 | A kind of combustion gas and the double coupled electricity-generation method and system of Thermal generation unit |
| CN112443833A (en) * | 2019-09-05 | 2021-03-05 | 中国科学院工程热物理研究所 | Pulverized coal fired boiler with bottom burner and control method thereof |
| CN112443833B (en) * | 2019-09-05 | 2023-01-06 | 中国科学院工程热物理研究所 | Pulverized coal fired boiler with bottom-mounted burner and control method thereof |
| CN111396865A (en) * | 2020-04-16 | 2020-07-10 | 东方电气集团东方锅炉股份有限公司 | High-efficient air feed system and circulating fluidized bed boiler thereof |
| CN111396865B (en) * | 2020-04-16 | 2024-04-30 | 东方电气集团东方锅炉股份有限公司 | High-efficient air supply system and circulating fluidized bed boiler thereof |
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