CN206036987U - Double reheat pot furnace type formula that three flues of afterbody were arranged - Google Patents
Double reheat pot furnace type formula that three flues of afterbody were arranged Download PDFInfo
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- CN206036987U CN206036987U CN201621021121.5U CN201621021121U CN206036987U CN 206036987 U CN206036987 U CN 206036987U CN 201621021121 U CN201621021121 U CN 201621021121U CN 206036987 U CN206036987 U CN 206036987U
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Abstract
The utility model discloses a double reheat pot furnace type formula that three flues of afterbody were arranged belongs to the power plant boiler field, including the afterbody flue, the afterbody flue is separated for preceding flue, well flue, rear flue, its characterized in that: preceding flue and well flue are equipped with low -temperature reheater vertical section, low -temperature reheater horizontal segment, economizer and flue gas adjusting the bezel along the flue gas direction in proper order, and rear flue is equipped with hot overgrate air heater, economizer and flue gas adjusting the bezel, air heater's the hot overgrate air export and the hot overgrate air entry intercommunication of hot overgrate air heater, the export of hot overgrate air and the furnace intercommunication of hot overgrate air heater along the flue gas direction in proper order. The utility model discloses satisfying balanced one, the low heat absorption again of secondary, adjusting reheat steam temperature and mate between three flue in the smoke resistance, reduce the economizer heat absorption and prevent the economizer vaporization, reduce exhaust gas temperature, improve boiler efficiency, the coal consumption of reduction unit.
Description
Technical field
This utility model belongs to station boiler field.
Background technology
The double reheat boiler of three flue of existing afterbody arrangement, in three flues of its afterbody generally arrangement once it is low again,
It is secondary it is low again with three kinds of heating surfaces of low temperature superheater.However, with the raising of Boiler Steam parameter, low heat absorption excessively accounts for superheater system
System heat absorption ratio very little (by taking 630 DEG C of double reheat Items as an example, it is low cross heat absorption only account for superheater system heat absorption 5%.
Low mistake can be cancelled by suitably increasing the heating surface area shielded and exceeded.But three damper of afterbody adjusts the pot of reheat steam temperature
Type of furnace formula, need to retain rear pass).The largely presence of low mistake is only played balance first and second and low absorb heat again, adjusts reheat steam temperature
With the effect for matching flue gas resistance between three flues.
Low mistake is absorbed heat and little brings problem as follows：
1. it is low cross outlet/economizer entrance flue gas temperature it is higher (by taking 630 DEG C of double reheat Items as an example, high load capacity
It is low to cross 520 DEG C of outlet cigarette temperature), easily cause the low economizer vaporization for crossing lower disposed, affect unit safety operation.
2., in order to reduce turbine heat rate, the more conventional project of boiler feed temperature has lifting by a relatively large margin (with 630 DEG C two
As a example by secondary reheating Items, feed temperature is up to 330 DEG C).In order to vaporize economizer exit working medium, the heat absorption of economizer is received
Limit, economizer exit cigarette temperature is improved, air preheater exhaust gas temperature is improved, and causes boiler efficiency to reduce.
Utility model content
The purpose of this utility model is：A kind of double reheat boiler shape of three flue of afterbody arrangement is proposed, is being met
Balance first and second low while absorb heat, adjust reheat steam temperature and match flue gas resistance between three flues again, reduce economizer heat absorption
Prevent economizer from vaporizing, reduce exhaust gas temperature, improve boiler efficiency, reduce unit coal consumption.
This utility model purpose is realized by following technical proposals：
A kind of double reheat boiler shape of three flue of afterbody arrangement, including back-end ductwork, back-end ductwork is separated by bag wall
Into three flues arranged side by side, respectively front flue, middle flue, rear pass, front flue and middle flue are sequentially provided with along flue gas direction
Low-temperature reheater vertical section, low-temperature reheater horizontal segment, economizer and gas proportioning damper, rear pass are set successively along flue gas direction
There are hot secondary wind heater, economizer and gas proportioning damper.
Low mistake in three flue double reheat boiler rear pass of existing afterbody is changed to hot secondary wind heating by this utility model
Device, which can equally play the first and second low work for absorbing heat, adjust reheat steam temperature and matching flue gas resistance between three flues again of balance
With.Additionally, the absorbable heat of hot secondary wind heater it is more (by taking 630 DEG C of double reheat Items as an example, its outlet cigarette temperature
Can be down to first and second it is low export 450 DEG C or so of identical cigarette temperature again, it is even lower), advantageously reducing economizer and absorbing heat prevents
Economizer is vaporized, meanwhile, secondary wind heat-recoverable is heated, exhaust gas temperature is reduced, boiler efficiency is improved, unit coal consumption is reduced.
Alternatively, the hot secondary wind outlet of air preheater is connected with the hot secondary wind entrance of hot secondary wind heater.
Alternatively, the hot secondary wind outlet of hot secondary wind heater is connected with burner hearth.
Alternatively, the low-temperature reheater of front flue is a low-temperature reheater, and the low-temperature reheater of middle flue is secondary
Low-temperature reheater.
Alternatively, the low-temperature reheater of front flue is secondary low-temperature reheater, and the low-temperature reheater of middle flue is for once
Low-temperature reheater.
Alternatively, the hot secondary wind entrance of hot secondary wind heater is located at the flue gas downstream of back-end ductwork, hot secondary wind
The hot secondary wind outlet of heater is located at the flue gas upstream of back-end ductwork.
Aforementioned this utility model main formula case and its each further selection scheme can be with independent assortments to form multiple schemes,
Can adopt for this utility model and claimed scheme；And this utility model, (each non conflicting selection) select between and and
Other can also independent assortment between selecting.Those skilled in the art after this utility model scheme is understood according to prior art and
Common knowledge can understand there is multiple combination, be the claimed technical scheme of this utility model, and here does not do exhaustion.
The course of work is：Fuel and air burn in burner hearth the flue gas of generation, Jing after upper furnace, horizontal flue, enter
Enter back-end ductwork.Back-end ductwork is separated into three flues arranged side by side by bag wall from front to back, respectively front flue, middle flue, after
Flue.In each flue, the corresponding low-temperature reheater horizontal segment of arrangement, hot secondary wind heater, arrange economizer afterwards.Often
The horizontal segment of individual low heating surface again is distinguished perpendicular heating surface (vertical section) and is connected.Three flue outlets of afterbody are respectively provided with cigarette
Gas controllable register, adjusts single reheat, the steam temperature of double reheat.Flue gas is respectively through the heated vertical being arranged in 3 flues
Face, it is low again, after hot secondary wind heater and economizer, transfer heat to heating surfaces at different levels, flue gas is cooled, air inlet
Preheater.After steam is heated in heating surfaces at different levels, respectively enter in next stage heating surface.It is hot secondary that air preheater is exported
Wind is admitted to after hot secondary wind heater is further heated and sends into burner hearth.
The beneficial effects of the utility model：
1. by hot secondary wind heater reduce by three flue double reheat boiler of afterbody after cigarette well economizer entrance cigarette temperature,
Economizer is desirably prevented to vaporize；
2. the more afterbody heats of three flue double reheat boiler of afterbody are absorbed by hot secondary wind heater, be conducive to drop
Low air preheater exhaust gas temperature, improves boiler efficiency.
Description of the drawings
Fig. 1 is device schematic flow sheet of the present utility model；
Flue before wherein 1 afterbody, flue in 2 afterbodys, 3 afterbody rear pass, 4 gas proportioning dampers (front), 5
Gas proportioning damper (in), 6 gas proportioning dampers (afterwards), 7 economizers (front), 8 economizers (in), 9 economizers
(afterwards), 10 once/secondary low-temperature reheater horizontal segment, 11 2 times/mono- time low-temperature reheater horizontal segment, 12 hot secondary wind
Heater, 13 once/secondary low-temperature reheater vertical section, 14 2 times/mono- time low-temperature reheater vertical section, 15 bag walls,
16- burner hearths, 17- horizontal flues, the hot secondary wind entrances of 121-, the hot secondary wind outlets of 122-.
Specific embodiment
Following non-limiting examples are used for illustrating this utility model.
Embodiment 1：
With reference to shown in Fig. 1, in figure, hollow Herba Alismatis Canaliculati head is flue gas flow direction, and solid small arrow is that hot secondary wind is flowed to.A kind of tail
The double reheat boiler shape of portion three flue arrangement, including back-end ductwork, back-end ductwork by bag wall 15 be separated into three it is arranged side by side
Flue 2, afterbody rear pass 3 in flue 1, afterbody before flue, respectively afterbody, before afterbody, flue 1 is sequentially provided with along flue gas direction
13, low-temperature reheater horizontal segment 10, economizer (front) 7 of low-temperature reheater vertical section and gas proportioning damper (front) 4,
In afterbody, flue 2 is sequentially provided with secondary low-temperature reheater vertical section 14, secondary low-temperature reheater horizontal segment 11, saves along flue gas direction
Coal device (in) 8 and gas proportioning damper (in) 5, afterbody rear pass 3 along flue gas direction be sequentially provided with hot secondary wind heater 12, save
Coal device (afterwards) 9 and gas proportioning damper (afterwards) 6, the hot secondary wind outlet of air preheater and the heat two of hot secondary wind heater 12
Secondary wind entrance 121 is connected, and the hot secondary wind outlet 122 of hot secondary wind heater 12 is connected with burner hearth.Hot secondary wind heater 12
Hot secondary wind entrance 121 located at the flue gas downstream of back-end ductwork, the hot secondary wind outlet 122 of hot secondary wind heater 12 is located at
The flue gas upstream of back-end ductwork.
Embodiment 2：
With reference to shown in Fig. 1, the present embodiment is substantially the same manner as Example 1, and its difference is：Before afterbody, the low temperature of flue 1 is again
Hot device (is followed successively by secondary low-temperature reheater vertical section 13, secondary low-temperature reheater water along flue gas direction for secondary low-temperature reheater
10), in afterbody, the low-temperature reheater of flue 2 (is followed successively by a cold reheat along flue gas direction for a low-temperature reheater to flat section
14, low-temperature reheater horizontal segment of device vertical section is 11).
Embodiment 3：
By taking 630 DEG C of double reheat Items as an example, BMCR operating modes have 30% exhaust gas volumn through afterbody rear pass (3),
The hot secondary wind heating that air preheater is exported by this partial fume.This partial fume temperature is down to 420 DEG C from 735 DEG C, hot secondary wind
478 DEG C are heated to from 360 DEG C.
As can be seen from the above table, compared with three flue double reheat boiler of existing afterbody, this utility model economizer exit
Deficient enthalpy is improved, boiler efficiency is improved, and is conducive to boiler safety, Effec-tive Function.
Preferred embodiment of the present utility model is the foregoing is only, it is not to limit this utility model, all at this
Any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in this utility model
Protection domain within.
Claims (6)
1. the double reheat boiler shape that a kind of three flue of afterbody is arranged, including back-end ductwork, back-end ductwork is separated into by bag wall
Three flues arranged side by side, respectively front flue, middle flue, rear pass, it is characterised in that：Front flue and middle flue are along flue gas direction
Low-temperature reheater vertical section, low-temperature reheater horizontal segment, economizer and gas proportioning damper is sequentially provided with, rear pass is along flue gas side
To being sequentially provided with hot secondary wind heater, economizer and gas proportioning damper.
2. the double reheat boiler shape that three flue of afterbody as claimed in claim 1 is arranged, it is characterised in that：Air preheater
The outlet of hot secondary wind connect with the hot secondary wind entrance of hot secondary wind heater.
3. the double reheat boiler shape that three flue of afterbody as claimed in claim 1 is arranged, it is characterised in that：Hot secondary wind adds
The hot secondary wind outlet of hot device is connected with burner hearth.
4. the double reheat boiler shape that three flue of afterbody as claimed in claim 1 is arranged, it is characterised in that：Front flue it is low
Warm reheater is a low-temperature reheater, and the low-temperature reheater of middle flue is secondary low-temperature reheater.
5. the double reheat boiler shape that three flue of afterbody as claimed in claim 1 is arranged, it is characterised in that：Front flue it is low
Warm reheater is secondary low-temperature reheater, and the low-temperature reheater of middle flue is a low-temperature reheater.
6. the double reheat boiler shape that three flue of afterbody as claimed in claim 1 is arranged, it is characterised in that：Hot secondary wind adds
, located at the flue gas downstream of back-end ductwork, the hot secondary wind outlet of hot secondary wind heater is located at afterbody for the hot secondary wind entrance of hot device
The flue gas upstream of flue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621021121.5U CN206036987U (en) | 2016-08-31 | 2016-08-31 | Double reheat pot furnace type formula that three flues of afterbody were arranged |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621021121.5U CN206036987U (en) | 2016-08-31 | 2016-08-31 | Double reheat pot furnace type formula that three flues of afterbody were arranged |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206036987U true CN206036987U (en) | 2017-03-22 |
Family
ID=58301809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621021121.5U Active CN206036987U (en) | 2016-08-31 | 2016-08-31 | Double reheat pot furnace type formula that three flues of afterbody were arranged |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206036987U (en) |
-
2016
- 2016-08-31 CN CN201621021121.5U patent/CN206036987U/en active Active
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