CN101408308A - Coal-burning boiler - Google Patents

Coal-burning boiler Download PDF

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Publication number
CN101408308A
CN101408308A CNA2008101223853A CN200810122385A CN101408308A CN 101408308 A CN101408308 A CN 101408308A CN A2008101223853 A CNA2008101223853 A CN A2008101223853A CN 200810122385 A CN200810122385 A CN 200810122385A CN 101408308 A CN101408308 A CN 101408308A
Authority
CN
China
Prior art keywords
flue gas
adjuster
coal
gas recirculation
isolated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CNA2008101223853A
Other languages
Chinese (zh)
Inventor
肯内斯L·马龙
谢鸣
陈金岳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NINGBO YINUO ENERGY TECHNOLOGY Co Ltd
Original Assignee
NINGBO YINUO ENERGY TECHNOLOGY Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NINGBO YINUO ENERGY TECHNOLOGY Co Ltd filed Critical NINGBO YINUO ENERGY TECHNOLOGY Co Ltd
Priority to CNA2008101223853A priority Critical patent/CN101408308A/en
Publication of CN101408308A publication Critical patent/CN101408308A/en
Pending legal-status Critical Current

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Abstract

The invention provides a coal boiler, comprising a boiler body and a grate; the lower side of the grate is provided with a lower fan which is communicated with a combustion chamber which is arranged at the bottom of the boiler; smoke in the boiler body enters a deduster through a high temperature heating surface and a low temperature heating surface; the coal boiler is characterized in that the lower side of the deduster is connected with a first smoke re-circulation pipeline which is provided with a re-circulation fan and communicated with the lower fan by a gas conveying pipe; the smoke and combustion air at the bottom of the boiler are mixed and enter the combustion chamber at the bottom of the boiler; the gas conveying pipe is provided with a flux control adjuster; the first smoke re-circulation pipeline is provided with a first isolation adjuster which is used for isolating and adjusting the smoke quantity; the first smoke re-circulation pipe is connected with a second smoke re-circulation pipeline provided with a second isolation adjuster; the second smoke re-circulation pipe is communicated with a hearth by an upper layer fan; the isolation adjuster and the re-circulation fan are respectively provided with a interlocking device; and the coal boiler can improve the boiler efficiency, reduce the smoke, the darkness of the smoke and the exhaust of NOX simultaneously, and can reconstruct the existing coal boilers of different types and capacities.

Description

A kind of coal-burning boiler
Technical field
The present invention relates to a kind of coal-burning boiler field, specifically refer to a kind ofly not only can improve described coal-burning boiler efficient but also can reduce flue dust and NO XThe coal-burning boiler of discharging; It is specially adapted to transform existing machinery formula coal-burning boiler to reduce the pollution of surrounding environment and to increase its efficient and exert oneself.
Background technology
The structure of prior mechanical coal-burning boiler includes body of heater and high-temperature surface that is connected and low temperature heating surface, and this body of heater bottom is provided with fire grate, and this fire grate top is provided with burner hearth; This fire grate downside is provided with air blast, and this air blast communicates with the furnace bottom combustion chamber.The flue gas of described burner hearth enters a deduster by described high-temperature surface and described low temperature heating surface, and this deduster discharges the dust in the described flue gas by chimney.
The soot particle that is limited by the factor of excess air during the operation of above-mentioned mechanical type coal-burning boiler and causes boiler smoke to carry is more, is difficult to control the over-emitting black exhaust phenomenon simultaneously, forms NO XExcessive emissions cause pollution to surrounding environment; Next is that the burner hearth flue gas of prior mechanical coal-burning boiler directly discharges by chimney, do not take to recycle, thereby its technical economic benefit is lower, can not adapt to the demand of modern industry again.
Summary of the invention
Technical problem to be solved by this invention is the situation at prior art, provides a kind of when not only can improve described coal-burning boiler efficient but also can reduce flue dust, reduce blackness of exhaustion and NO XThe coal-burning boiler of discharging.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of coal-burning boiler, comprise body of heater and high-temperature surface that is connected and low temperature heating surface, and this body of heater bottom is provided with fire grate, and this fire grate top is provided with burner hearth; This fire grate downside is provided with down air blast, this time air blast communicates with the furnace bottom combustion chamber, the flue gas of described burner hearth enters a deduster by described high-temperature surface and described low temperature heating surface, it is characterized in that: described deduster downside is connected with the first flue gas recirculation pipeline, this first flue gas recirculation pipeline is provided with recirculation blower and is connected with described air blast down by appendix, and described flue gas and furnace bottom combustion air are mixed into described furnace bottom combustion chamber.
The present invention is because the downside of deduster connects the flue gas recirculation pipeline, and flue gas and furnace bottom combustion air are mixed into the furnace bottom combustion chamber by recycling fan, it will take away more heat from burner hearth, the mechanical type coal-burning boiler can be moved under lower excess air, the boiler smoke flow velocity is reduced, thereby the soot particle that original boiler smoke is carried reduce.
Described appendix can be provided with the flow-control adjuster; Its effect is control and the flue gas of breaking off entering the furnace bottom combustion chamber.
Can be provided with on the described first flue gas recirculation pipeline and isolate and the first isolated and adjuster of regulating exhaust gas volumn; Should isolated effect be the exhaust gas volumn that control enters down air blast with adjuster, and when the inactive flue gas recirculation function of the present invention of selection to isolate this system.
Be connected with the second flue gas recirculation pipeline on the described first flue gas recirculation pipeline and at the described first isolated rear portion with adjuster, this second flue gas recirculation pipeline is connected with described burner hearth by a upper strata blower fan; Its effect is to reduce the soot particle that boiler smoke carries equally.
The described second flue gas recirculation pipeline can be provided with and be used to control the second isolated and adjuster that enters described burner hearth exhaust gas volumn; Its function is that control enters the exhaust gas volumn of described burner hearth or isolates the ducted flue gas of this second flue gas recirculation.
But the described second flue gas recirculation pipeline is the isolated airduct road, outside upper strata with adjuster of tape splicing the 3rd also, and this airduct road, upper strata, outside is positioned at the rear portion of described second isolated and the adjuster, to expand the input channel in overfire air source.
Described first isolated is provided with interlock with adjuster and described recycling fan.Its effect is in the time of can avoiding recycling fan to break down, and first isolated closes automatically with adjuster, realizes reliability of operation and security.
Described second isolated the completely cutting off with adjuster and described upper strata blower fan with adjuster, the described the 3rd was provided with interlock.Its effect is in the time of can avoiding the upper strata blower fan to break down, and the second and the 3rd isolated closes automatically with adjuster, realizes reliability of operation and security.
The present invention is owing to set up a cover flue gas recirculation device on the structure of prior mechanical coal-burning boiler, compared with prior art, its advantage is to improve boiler efficiency, also can reduce NO simultaneously XDischarging; Can to existing dissimilar and capacity add coal burning boiler transformation, to promote its economy and technique effect and to alleviate pollution to environment.
Description of drawings
Fig. 1 is a flue gas system schematic diagram of the present invention;
The specific embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of coal-burning boiler, the high-temperature surface 11 and low temperature heating surface 12 that comprise body of heater 1 and be connected, this body of heater bottom is provided with fire grate 2, this fire grate top is provided with burner hearth 3, and this fire grate downside is provided with down air blast 4, and it communicates with furnace bottom combustion chamber 21; The flue gas of burner hearth 3 enters a deduster 7 by high-temperature surface 11 and low temperature heating surface 12; These deduster 7 downsides are connected with the first flue gas recirculation pipeline 9, and this first flue gas recirculation pipeline is provided with recirculation blower 10 and is connected with following air blast 4 by appendix 22, and flue gas and furnace bottom combustion air are mixed into furnace bottom combustion chamber 21.
Be positioned at the body of heater outside and above fire grate 2, be provided with feeding system 5, this feeding system is delivered to coal or other waste combustible materials matter on the fire grate 2 and is carried out ignition, when coal burns in burner hearth 3, the high-temperature surface 11 that the high-temperature flue gas that produces on burner hearth 3 tops enters band steam tube and heating tube enters deduster 7 again with low temperature heating surface 12, and produces steam; Arrow illustrates the passage that flue gas is flowed through among Fig. 1.
Inventive point of the present invention is that the downside of deduster 7 is connected with the first flue gas recirculation pipeline 9, and this first flue gas recirculation pipeline 9 is connected by the air blast 4 of recycling fan 10 with fire grate 2 downsides; Flue gas and furnace bottom combustion air are mixed into furnace bottom combustion chamber 21, because the specific heat of flue gas is big than air, so it will take away more heat from burner hearth, temperature peak can be reduced, therefore, the mechanical type coal-burning boiler can move under lower excess air, and excess air descends, the boiler smoke flow velocity is reduced, and the soot particle that original boiler smoke is carried reduces.
Flue gas is connected with following air blast 4 by appendix 22, and flue gas and furnace bottom combustion air are mixed into furnace bottom combustion chamber 21.
Appendix 22 is provided with flow-control adjuster 20, the flue gas that is used to control Yu breaks off leading to furnace bottom combustion chamber 21.
The first flue gas recirculation pipeline 9 is provided with the first isolated and adjuster 13, and this completely cuts off and adjuster 13 is to be used to control the exhaust gas volumn that enters down air blast 4; And when select stopping using flue gas recirculation function of the present invention to isolate this system.
Be connected with the second flue gas recirculation pipeline 14 on the first flue gas recirculation pipeline 9 and at the first isolated rear portion with adjuster 13, this second flue gas recirculation pipeline 14 is connected with burner hearth 3 by a upper strata blower fan 15; The second flue gas recirculation pipeline 14 is provided with second isolated and the adjuster 16, and this second isolated and adjuster 16 are to be used to control the exhaust gas volumn that enters described burner hearth 3; And when select stopping using flue gas recirculation function of the present invention, can isolate this system.
Can also connecting band on the second flue gas recirculation pipeline 14 and at the rear portion of second isolated and the adjuster 16 the airduct road, outside upper strata 18 of the 3rd isolated and adjuster 17, this airduct road, upper strata, outside 18 also is connected with burner hearth 3 by described upper strata blower fan 15; Enter the upper strata air quantity of burner hearth 3 with adjusting, further promote to promote heat energy productivity ratio of the present invention.
The flue gas of burner hearth 3 of the present invention enters deduster 7 by high-temperature surface 11 and low temperature heating surface 12, this deduster 7 with the dust in the described flue gas by chimney 8 when effluxing, utilize that remaining flue gas heat energy mixes with the combustion air that following air blast 4 exports in deduster 7; Adopt the ducted isolated and controller structure of a plurality of flue gas recirculation simultaneously, thereby the flue gas recirculation system and device all can completely cut off and close in any case, original mode that can realize coal-burning boiler in very short time continues operation, and follows original air quantity and load relation.
First of the first flue gas recirculation pipeline completely cuts off and adjuster 13 is provided with interlock with recycling fan 10, and before the electrical power of recycling fan 10, first completely cuts off with adjuster 13 and can not open; When recycling fan 10 broke down, first completely cut off with adjuster 13 and will close automatically.
Similarly, second isolated is provided with interlock with adjuster 16 and upper strata blower fan 15, and before the electrical power of upper strata blower fan 15, second isolatedly can not open with adjuster 16; When upper strata blower fan 15 broke down, second completely cut off with adjuster 16 and will close automatically.
The executing agency of the regulating element of the isolated and adjuster of flue gas recirculation of the present invention is connected with the control signal in the control room of described coal-burning boiler.The isolated regulating element with adjuster of this flue gas recirculation is optional with manually-operated or automatic control mode.
Regulating element in flue gas recirculation pipeline of the present invention and pipe joint thereof, isolated and the adjuster must be with the wear-resisting steel making of high-quality, to guarantee its operating accuracy and service life.
The present invention is provided with described flue gas EGR in coal-burning boiler, thereby forms a kind of coal-burning boiler of high thermal efficiency; The flue gas recirculation system and device can completely cut off rapidly again and close simultaneously, thereby has widened the flexibility that boiler uses.
The present invention can improve boiler efficiency and reduce flying dust and slag in combustible and reduce soot particle, blackness and NO XDischarge capacity to the pollution of environment.It especially is suitable for transforming existing use outmoded coal-burning boiler for many years.

Claims (8)

1, a kind of coal-burning boiler, the high-temperature surface (11) and low temperature heating surface (12) that comprise body of heater (1) and be connected, this body of heater (1) bottom is provided with fire grate (2), and this fire grate (2) top is provided with burner hearth (3); This fire grate (2) downside is provided with down air blast (4), this time air blast (4) communicates with furnace bottom combustion chamber (21), the flue gas of described burner hearth (3) enters a deduster (7) by described high-temperature surface (11) and described low temperature heating surface (12), it is characterized in that: described deduster (7) downside is connected with the first flue gas recirculation pipeline (9), this first flue gas recirculation pipeline (9) is provided with recirculation blower (10) and also is connected with described air blast (4) down by appendix (22), and described flue gas and described furnace bottom combustion air are mixed into described furnace bottom combustion chamber (21).
2, coal-burning boiler according to claim 1 is characterized in that: described appendix (22) is provided with flow-control adjuster (20).
3, coal-burning boiler according to claim 1 is characterized in that: the described first flue gas recirculation pipeline (9) is provided with isolates and the first isolated and adjuster (13) of regulating exhaust gas volumn.
4, coal-burning boiler according to claim 3, it is characterized in that: the described first flue gas recirculation pipeline (9) is gone up and is connected with the second flue gas recirculation pipeline (14) at the described first isolated rear portion with adjuster (13), and this second flue gas recirculation pipeline (14) is connected with described burner hearth (3) by a upper strata blower fan (15).
5, coal-burning boiler according to claim 4 is characterized in that: the described second flue gas recirculation pipeline (14) is provided with and is used to control the second isolated and adjuster (16) that enters described burner hearth exhaust gas volumn.
6, coal-burning boiler according to claim 5, it is characterized in that: the described second flue gas recirculation pipeline (14) also is connected to airduct road, outside upper strata (18) with the 3rd isolated and adjuster (17), and this airduct road, upper strata, outside (18) is positioned at the rear portion of described second isolated and the adjuster (16).
7, according to claim 1 or 4 described coal-burning boilers, it is characterized in that: described first isolated is provided with interlock with adjuster (13) and described recycling fan (10).
8, according to claim 4 or 6 described coal-burning boilers, it is characterized in that: described second isolated the completely cutting off with adjuster (17) and described upper strata blower fan (15) with adjuster (16), the described the 3rd was provided with interlock.
CNA2008101223853A 2008-11-24 2008-11-24 Coal-burning boiler Pending CN101408308A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2008101223853A CN101408308A (en) 2008-11-24 2008-11-24 Coal-burning boiler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2008101223853A CN101408308A (en) 2008-11-24 2008-11-24 Coal-burning boiler

Publications (1)

Publication Number Publication Date
CN101408308A true CN101408308A (en) 2009-04-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
CNA2008101223853A Pending CN101408308A (en) 2008-11-24 2008-11-24 Coal-burning boiler

Country Status (1)

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CN (1) CN101408308A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102607168A (en) * 2012-03-09 2012-07-25 大连科林能源工程技术开发有限公司 High-temperature high-pressure air heating furnace
CN103196130A (en) * 2013-04-27 2013-07-10 东南大学 Method and device for gradient utilization of heat of oxygen-enriched combustion unit
CN103234213A (en) * 2013-04-27 2013-08-07 东南大学 Method and device for utilizing oxygen-enriched combustion heat
CN106016315A (en) * 2016-05-10 2016-10-12 湖北宜化集团有限责任公司 Boiler system capable of preventing coking

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102607168A (en) * 2012-03-09 2012-07-25 大连科林能源工程技术开发有限公司 High-temperature high-pressure air heating furnace
CN103196130A (en) * 2013-04-27 2013-07-10 东南大学 Method and device for gradient utilization of heat of oxygen-enriched combustion unit
CN103234213A (en) * 2013-04-27 2013-08-07 东南大学 Method and device for utilizing oxygen-enriched combustion heat
CN103234213B (en) * 2013-04-27 2015-10-14 东南大学 A kind of method of oxygen-enriched combusting Btu utilization and device
CN106016315A (en) * 2016-05-10 2016-10-12 湖北宜化集团有限责任公司 Boiler system capable of preventing coking

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Open date: 20090415