CN104075339A - Power station pulverized coal boiler heat insulation band and method for determining area and laying position of heat insulation band - Google Patents
Power station pulverized coal boiler heat insulation band and method for determining area and laying position of heat insulation band Download PDFInfo
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- CN104075339A CN104075339A CN201410326674.0A CN201410326674A CN104075339A CN 104075339 A CN104075339 A CN 104075339A CN 201410326674 A CN201410326674 A CN 201410326674A CN 104075339 A CN104075339 A CN 104075339A
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- insulating belt
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Abstract
The invention discloses a power station pulverized coal boiler heat insulation band and a method for determining the area and the laying position of the heat insulation band. The heat insulation band is arranged on a membrane wall of a non-combustion area of the upper portion of a boiler furnace and is made of pins and fireproof and thermal insulation materials, the pins are welded to the outer wall of a membrane wall pipe, the fireproof and thermal insulation materials are laid to the outer sides of fins of the membrane wall pipe, and the thickness of the fireproof and thermal insulation materials covers the pins. Heat absorption quantity of the membrane wall of the upper portion of the furnace is reduced through the heat insulation band which is arranged in a laying mode, the temperature of smoke of the upper portion of the furnace is improved, and heat absorption quantity of a superheater arranged on the upper portion of the furnace is improved, so that the temperature of superheated steam is improved, and safety risks caused by furnace coking are avoided. Meanwhile, a mathematic model of the area of the heat insulation band of the furnace with the membrane wall, the steam temperature, needing to be improved, of the superheater and other related parameters is set up, the concept of the improvement degree of the smoke temperature of the furnace is put forward, and a mathematic model of the improvement degree of the smoke temperature of the furnace and the area of the heat insulation band is set up. The area and position where the heat insulation band is needed to be arranged in the laying mode are determined according to two models.
Description
Technical field
The present invention relates to a kind of generating plant pulverized coal boiler, be specifically related to a kind of method that is laid in heat insulating belt on generating plant pulverized coal boiler upper furnace fin panel casing and definite heat insulating belt area and lays position.
Background technology
Superheat steam temperature is the key parameter of station boiler, and it is the problem that generating plant pulverized coal boiler often occurs that vapor (steam) temperature does not reach design load, and it has directly affected the economy of unit, even threatens the security of operation of steam turbine when serious.Often there is superheat steam temperature phenomenon on the low side in the boiler that new boiler of going into operation and ature of coal change, the method conventionally addressing this problem is to carry out boiler plant transformation, as burner reconstruction, boiler heating surface adjustment etc.Scrap build drops on the one hand very large, transforms long in time limitly, easily causes boiler combustion thermic load not mate with heat transfer area and the negative effect that produces simultaneously.Also have attempt by boiler furnace, the burner of bottom arranges wall with refractory lining, refracto around and near the spout of burner, the ignition energy, strengthening coal dust firing and the raising combustion stability that improve breeze airflow improve the temperature of superheated steam.But the high-temperature region that the setting position of wall with refractory lining, refracto is burner hearth, can gather on wall with refractory lining, refracto, the coal ash that bonds, as easy as rolling off a logly under high temperature and reducing atmosphere cause burner hearth coking, safe operation of the boiler is produced a very large impact.
Summary of the invention
The object of the present invention is to provide one can improve superheat steam temperature, can avoid again the heat insulating belt of boiler furnace coking and how determine the area of heat insulating belt and the method for laying position.
The invention discloses a kind of generating plant pulverized coal boiler heat insulating belt, this heat insulating belt is arranged on the fin panel casing of non-combustion zone, boiler furnace top, formed by pin and fire-resistant heat insulating material, pin is welded on the outer wall of monowall tube, fire-resistant heat insulating material is laid in the fin outside of monowall tube, and its thickness covers pin.
Described heat insulating belt lays around described fin panel casing complete cycle or interruption.
A kind of method that the invention also discloses area of definite generating plant pulverized coal boiler heat insulating belt and specifically lay position, the method is by setting up
with
two mathematics model realizations:
ΔT＝f(S,D,A,h
0)……………………………………
Δ T-superheat steam temperature hoisting depth in formula (DEG C);
S-heat insulating belt area (m
2)
D-superheat steam flow (t/h);
A-pendant superheater area (m
2);
H
0the relative furnace height of-heat insulating belt;
H＝k×L×λ
－1×S/[2(a+b)]…………………………
H-burner hearth cigarette temperature hoisting depth (m);
L-heat insulating belt relative thickness, L=L
sj/ L
jb, L
sj-heat insulating belt actual (real) thickness, L
jb-basic thickness
The thermal conductivity factor of λ-heat insulating belt material;
S-heat insulating belt area (m
2);
A-furnace width (m);
B-furnace depth (m);
K-heat insulating belt pickup coefficient.
Model
in, superheat steam temperature hoisting depth Δ T represents the poor of actual superheat steam temperature value that superheat steam temperature design load and boiler produce.
H
0represent the ratio of heat insulating belt centre-to-centre spacing furnace hopper slope centre-height and furnace height.
Model
in, H is illustrated in upper furnace and lays after heat insulating belt, in the flue-gas temperature of upper furnace, moves, the height that identical flue-gas temperature point promotes, and that determines heat insulating belt according to these data specifically lays position.K represents that in boiler running process, heat insulating belt surface attaches the coefficient that the materials such as cinder cause heat-insulating capability to improve, and determines by heat transfer experiment.
First according to model
, the superheat steam temperature improving as required draws the heat insulating belt area that must arrange.Then according to definite heat insulating belt structure, on the boiler model in laboratory or pulverized-coal fired boiler product, lay the heat insulating belt of corresponding construction, draw Mathematical Modeling by heat transfer experiment
the numerical value of middle heat insulating belt pickup coefficient k, the data of the definite heat insulating belt area S of integrating step (1) are according to Mathematical Modeling
determine burner hearth cigarette temperature hoisting depth H, that determines described heat insulating belt according to burner hearth cigarette temperature hoisting depth H specifically lays position.
Principle of the present invention is: lay the poor heat-barrier material of thermal conduction characteristic in the non-combustion zone of the relatively low upper furnace of flue-gas temperature level, reduce the caloric receptivity of fin panel casing, improve upper furnace temperature, increase the caloric receptivity that is arranged in upper furnace superheater, thereby raising superheat steam temperature has been avoided burner hearth coking and the security risk brought simultaneously.
The present invention reduces burner hearth heat absorption by heat insulation bringing is set on the fin panel casing in non-combustion zone, boiler furnace top, promotes upper furnace flue-gas temperature and then improves superheat steam temperature.Because the non-combustion zone temperature levels of upper furnace is low, avoided grey melting point temperature, and the concentration of this position carbon monoxide is low, thus on heat insulating belt, be difficult to coking, even if surface has floating ash to be also easy to be blown off by soot blower.Solve because the burner hearth coking problem that wall with refractory lining, refracto causes the temperature that improves superheated steam are set, improve the economic benefit of unit, ensure the security of operation of steam turbine.
New boiler need not arrange wall with refractory lining, refracto only need arrange heat insulating belt on the fin panel casing of the non-combustion zone of burner hearth, old boiler, without carrying out burner reconstruction and boiler heating surface adjustment, arranges heat insulating belt after only wall with refractory lining, refracto need being dismantled on the fin panel casing of the non-combustion zone of burner hearth.
In sum, the present invention has set up two Mathematical Modelings, the concept of burner hearth cigarette temperature hoisting depth has been proposed, on the fin panel casing of non-combustion zone, boiler furnace top, heat insulating belt is set, with raising superheat steam temperature time, solve the coking problem of burner hearth, there is following advantage: improve superheat steam temperature, reduce unit coal consumption; Avoid, because vapor (steam) temperature is too low, steam turbine is caused to safety hazard; Improve the adaptive capacity of boiler to coal type change.
Figure of description
Fig. 1 is the position schematic diagram of heat insulating belt of the present invention.
Fig. 2 is the structural representation of heat insulating belt.
Detailed description of the invention
The invention discloses a kind of generating plant pulverized coal boiler heat insulating belt, this heat insulating belt is arranged on the fin panel casing of non-combustion zone, boiler furnace top, formed by pin 1 and fire-resistant heat insulating material 2, pin 1 is welded on the outer wall of monowall tube 3, fire-resistant heat insulating material 2 is laid in fin 31 outsides of monowall tube 3, and its thickness covers pin 1.
A kind of method that the invention also discloses area of definite generating plant pulverized coal boiler heat insulating belt and specifically lay position, the method is by setting up
with
two mathematics model realizations:
ΔT＝f(S,D,A,h
0)……………………………………
Δ T-superheat steam temperature hoisting depth in formula (DEG C);
S-heat insulating belt area (m
2)
D-superheat steam flow (t/h);
A-pendant superheater area (m
2);
H
0the relative furnace height of-heat insulating belt, refers to the ratio of heat insulating belt centre-to-centre spacing furnace hopper slope centre-height and furnace height)
H＝k×L×λ
－1×S/[2(a+b)]…………………………
H-burner hearth cigarette temperature hoisting depth (m);
L-heat insulating belt relative thickness, L=L
sj/ (L
jb+ 20), L
sj-heat insulating belt actual (real) thickness (mm), L
jb-basic thickness, for water screen tube fin surface is to pipe upper surface vertical height (mm);
The thermal conductivity factor of λ-heat insulating belt material;
S-heat insulating belt area (m
2);
A-furnace width (m);
B-furnace depth (m);
K-heat insulating belt pickup coefficient.
Model
in, superheat steam temperature hoisting depth Δ T represents the poor of actual superheat steam temperature value that superheat steam temperature design load and boiler produce.
Model
in, H is illustrated in upper furnace and lays after heat insulating belt, in the flue-gas temperature of upper furnace, moves, the height that identical flue-gas temperature point promotes.K represents that in boiler running process, heat insulating belt surface attaches the coefficient that the materials such as cinder cause heat-insulating capability to improve, and chamber heat transfer experiment is determined by experiment.
Embodiment mono-, applies the present invention to 2 300MW Sub-critical Parameter tangentially-fired boiler transformations of Datang crossdrift electricity generating corporation, Ltd.These two boilers are manufactured and designed by Harbin Boiler Plant.At full capacity, design superheat steam temperature and reheat steam temperature are 540 DEG C, since going into operation, and the problem that long-term existence reheat steam temperature is on the low side.At full capacity, general reheat steam temperature, lower than 530 DEG C, has a strong impact on the economy of unit operation.Datang crossdrift electricity generating corporation, Ltd adopts method of the present invention to transform, according to model
with
, the upper furnace space at the tertiary air of this boiler to after-flame wind, has put 12 at four wall papers of fin panel casing and has added up to the heat insulating belt of 60 square metres.After transformation, measure, under same 300MW load, furnace outlet gas temperature is promoted to 1040 DEG C by transforming first 1010 DEG C, and reheat steam temperature is promoted to 534.8 DEG C by 529.0 DEG C before transforming, superheat steam temperature is promoted to 541 DEG C by transforming first 539 DEG C, and correctional effect is obvious.
Embodiment bis-, applies the present invention to face-fired boiler, and the laying area of heat insulating belt is that on the fin panel casing more than burnt wind, below superheater, the area S of heat insulating belt and burner hearth cigarette temperature hoisting depth H are according to model
with
determine.
Embodiment tri-, applies the present invention to W flame boiler, and the laying area of heat insulating belt is upper furnace, on fin panel casing below superheater, and the area S of heat insulating belt and burner hearth cigarette temperature hoisting depth H are according to model
with
determine.
Claims (4)
1. a generating plant pulverized coal boiler heat insulating belt, it is characterized in that: this heat insulating belt is arranged on the fin panel casing of non-combustion zone, boiler furnace top, formed by pin and fire-resistant heat insulating material, pin is welded on the outer wall of monowall tube, fire-resistant heat insulating material is laid in the fin outside of monowall tube, and its thickness covers pin.
2. fin panel casing generating plant pulverized coal boiler heat insulating belt as claimed in claim 1, is characterized in that: described heat insulating belt lays around described fin panel casing complete cycle or interruption.
3. determine the area of generating plant pulverized coal boiler heat insulating belt as claimed in claim 1 and a method of specifically laying position, comprise the following steps:
(1) set up described heat insulating belt area and the superheater vapor (steam) temperature that needs to improve and the Mathematical Modeling of other relevant parameters
, the superheat steam temperature improving is as required determined the heat insulating belt area that must arrange;
ΔT＝f(S,D,A,h
0)………………………………
Δ T-superheat steam temperature hoisting depth in formula (DEG C),
S-heat insulating belt area (m
2),
D-superheat steam flow (t/h),
A-pendant superheater area (m2),
The relative furnace height of h0-heat insulating belt,
(2) set up the Mathematical Modeling of burner hearth cigarette temperature hoisting depth H and heat insulating belt area S and other relevant parameters
,
The heat insulating belt structure definite according to claim 1 laid the heat insulating belt of corresponding construction on the boiler model in laboratory or pulverized-coal fired boiler product, draws Mathematical Modeling by heat transfer experiment
the numerical value of middle heat insulating belt pickup coefficient k, the data of the definite heat insulating belt area S of integrating step (1) are according to Mathematical Modeling
determine burner hearth cigarette temperature hoisting depth H, that determines described heat insulating belt according to burner hearth cigarette temperature hoisting depth H specifically lays position.
4.H＝k×L×λ
－1×S/[2(a+b)]…………………………
h-burner hearth cigarette temperature hoisting depth (m) in formula,
S-heat insulating belt area (m
2),
L-heat insulating belt relative thickness, L=L
sj/ L
jb, L
sj-heat insulating belt actual (real) thickness, L
jb-basic thickness;
The thermal conductivity factor of λ-heat insulating belt material,
A-furnace width (m),
B-furnace depth (m),
K-heat insulating belt pickup coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410326674.0A CN104075339A (en) | 2014-07-10 | 2014-07-10 | Power station pulverized coal boiler heat insulation band and method for determining area and laying position of heat insulation band |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410326674.0A CN104075339A (en) | 2014-07-10 | 2014-07-10 | Power station pulverized coal boiler heat insulation band and method for determining area and laying position of heat insulation band |
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| Publication Number | Publication Date |
|---|---|
| CN104075339A true CN104075339A (en) | 2014-10-01 |
Family
ID=51596791
Family Applications (1)
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|---|---|---|---|
| CN201410326674.0A Pending CN104075339A (en) | 2014-07-10 | 2014-07-10 | Power station pulverized coal boiler heat insulation band and method for determining area and laying position of heat insulation band |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104791759A (en) * | 2015-03-31 | 2015-07-22 | 中国神华能源股份有限公司 | Connection fins for being connected among water-cooled tubes on water-cooled boiler wall, method and boiler |
| CN109458613A (en) * | 2018-11-29 | 2019-03-12 | 上海九荣环境能源科技有限公司 | A kind of biomass direct-fired hot-water boiler |
| CN110260300A (en) * | 2019-05-29 | 2019-09-20 | 华中科技大学 | Increase the boiler furnace structure and supercritical carbon dioxide coal-burning boiler of thermal resistance outside interior augmentation of heat transfer |
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| CN201748415U (en) * | 2010-04-28 | 2011-02-16 | 四川川锅锅炉有限责任公司 | Full water cooling membrane wall eccentric separator |
| CN202692117U (en) * | 2012-08-07 | 2013-01-23 | 大唐贵州野马寨发电有限公司 | Refractory belt capable of reducing local temperature of boiler |
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2014
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201748415U (en) * | 2010-04-28 | 2011-02-16 | 四川川锅锅炉有限责任公司 | Full water cooling membrane wall eccentric separator |
| CN202692117U (en) * | 2012-08-07 | 2013-01-23 | 大唐贵州野马寨发电有限公司 | Refractory belt capable of reducing local temperature of boiler |
Non-Patent Citations (2)
| Title |
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| 强君刚，等: "300MW锅炉再热汽温低及卫燃带改造研究", 《锅炉制造》 * |
| 陈冬林，等: "炉内卫燃带敷设位置和面积的试验研究", 《长沙电力学院学报（自然科学报）》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104791759A (en) * | 2015-03-31 | 2015-07-22 | 中国神华能源股份有限公司 | Connection fins for being connected among water-cooled tubes on water-cooled boiler wall, method and boiler |
| CN104791759B (en) * | 2015-03-31 | 2017-09-26 | 中国神华能源股份有限公司 | For connection fin, method and the boiler being connected between the water cooling tube of boiler water wall |
| CN109458613A (en) * | 2018-11-29 | 2019-03-12 | 上海九荣环境能源科技有限公司 | A kind of biomass direct-fired hot-water boiler |
| CN110260300A (en) * | 2019-05-29 | 2019-09-20 | 华中科技大学 | Increase the boiler furnace structure and supercritical carbon dioxide coal-burning boiler of thermal resistance outside interior augmentation of heat transfer |
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Application publication date: 20141001 |