CN201072138Y - Novel boiler air preheater - Google Patents
Novel boiler air preheater Download PDFInfo
- Publication number
- CN201072138Y CN201072138Y CNU2007201286444U CN200720128644U CN201072138Y CN 201072138 Y CN201072138 Y CN 201072138Y CN U2007201286444 U CNU2007201286444 U CN U2007201286444U CN 200720128644 U CN200720128644 U CN 200720128644U CN 201072138 Y CN201072138 Y CN 201072138Y
- Authority
- CN
- China
- Prior art keywords
- air
- valve
- heat exchanger
- pipelines
- heat exchangers
- 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.)
- Expired - Fee Related
Links
Classifications
-
- 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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- Air Supply (AREA)
Abstract
The utility model discloses a novel boiler air preheater, which comprises two heat exchangers. A smoke exhaust pipeline and an air inlet pipeline are respectively arranged on each heat exchanger, the smoke exhaust pipelines of the two heat exchangers are crosswise communicated through two connecting pipelines, the air inlet pipelines of the two heat exchangers are also crosswise communicated through two connecting pipelines, the smoke exhaust pipelines and the air inlet pipelines are respectively provided with valves at the part between the two connecting pipelines, and valves are respectively arranged on the connecting pipelines. The preheater not only can effectively solve the problem of air leakage, but also has the advantages that the heating speed is quick, the performance is stable, and the maintenance is easy.
Description
Technical field
The utility model relates to the auxiliary device of boiler, exactly is the air preheater of boiler.
Background technology
Present boiler air preheater mainly contains two kinds of tubular air preheater and rotary regenerative air preheaters, for improving boiler efficiency important function is arranged, wherein the subject matter that faces of tubular air preheater is cold end corrosion, and leaking out of rotary regenerative air preheater is comparatively serious, can accomplish that 6% air leak rate of air curtain has been quite difficult.
The utility model content
At the problem of existing rotary air preheater air leak, the boiler air preheater that provides a kind of air leak rate of air curtain low is provided the purpose of this utility model.
For achieving the above object, the technical solution adopted in the utility model is:
A kind of boiler air preheater, comprise two heat exchangers, be equipped with smoke discharging pipe and admission line on each heat exchanger, the smoke discharging pipe of two heat exchangers intersects by two connecting pipes and is communicated with, the admission line of two heat exchangers also intersects by two connecting pipes and is communicated with, smoke discharging pipe and the admission line part between its two connecting pipes respectively are provided with valve, also are respectively equipped with valve on the connecting pipe.
The line design of the utility model uniqueness can make air and flue gas alternating current through two heat exchangers, by opening or concerning that valve can switch.When air is flowed through first heat exchanger, by first heat exchanger it is heated, this moment, flue gas heated second heat exchanger, when air is flowed through second heat exchanger, by second heat exchanger it is heated, this moment, flue gas heated first heat exchanger.This preheater can not only effectively solve the problem of leaking out, and has also that firing rate is fast, stable performance, is easy to beneficial effect such as maintenance.
Description of drawings
Fig. 1 is an overall structure schematic diagram of the present utility model.
The specific embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail.
Description of reference numerals is as follows:
11,22---heat exchanger
13,23---smoke discharging pipe
14,24---admission line
15,25,15 ', 25 '---connecting pipe
16,17,26,27,18,28,18 ', 28 '---valve
As shown in Figure 1, this air preheater mainly is made up of heat exchanger 11 and heat exchanger 22, heat exchanger 11 is provided with smoke discharging pipe 13 and admission line 14, heat exchanger 22 is provided with smoke discharging pipe 23 and admission line 24, smoke discharging pipe 13 intersects by connecting pipe 15 and connecting pipe 25 with smoke discharging pipe 23 and is communicated with, admission line 14 and admission line 24 is by connecting pipe 15 ' and connecting pipe 25 ' intersections connection, smoke discharging pipe 13 and admission line 14 part between its two connecting pipes respectively are provided with valve 16 and valve 17, smoke discharging pipe 23 and admission line 24 part between its two connecting pipes respectively are provided with valve 26 and valve 27, be respectively equipped with valve 18 and valve 28 on connecting pipe 15 and the connecting pipe 25, connecting pipe 15 ' and connecting pipe 25 ' on be respectively equipped with valve 18 ' and valve 28 '.During use, at first hot flue gas is by valve 16, valve 17 heat exchanger 11 of flowing through, heating heat exchanger 11, meanwhile air is by valve 26, valve 27 heat exchanger 22 of flowing through, heat exchanger 22 heating air flowing, in this process, valve 18, valve 28, valve 18 ', valve 28 ' all close, to prevent that flue gas from mixing with air, absorb heat at heat exchanger, after the heat release comparatively fully, valve 18, valve 28, valve 18 ', valve 28 ' open and valve 16, valve 17, valve 26, valve 27 is closed, this moment hot flue gas heating heat exchanger 22 and heat exchanger 11 adds hot-air.
Below the air leak rate of air curtain of this improved air preheater is calculated: the principal length of supposition heat exchanger is L, and total cross-sectional area is S, and wherein flow area is S
1, non-flow area is S
2, obviously: S=S
1+ S
2
If valve can instantaneously be closed tight, this preheater that blows is leaked out mainly is because air or flue gas are after passing through heat exchanger, residual to some extent in the space of heat exchanger itself, the air leak rate of air curtain ε of heat exchanger counts the ratio of air/exhaust gas volumn through-flow in residual air/exhaust gas volumn and the one-period so, that is:
Wherein v is an air velocity, and t is the through-flow time of air-flow in the work period.
Because the air-flow heat release is all absorbed by heat exchanger, according to energy balance:
c
p·S
1·v·t·ρ
g(T
1-T
2)＝c·S
2·L·ρ(T
1-T
2)
Put in order: c
pS
1Vt ρ
g=cS
2L ρ
Can get in conjunction with following formula:
C wherein
pBe pressurization by compressed air specific heat capacity, ρ
gBe atmospheric density, c is the heat exchanger materials specific heat capacity, and ρ is a heat exchanger materials density.
Can be easy to estimate this to blowing the air leak rate of air curtain of air preheater according to this formula: the air ratio thermal capacitance is 1.0045, density is got 1.25 (the following 500 ℃ of hot smoke densities about 0.5 of normal pressure), the material specific heat capacity is got 1 (generally greater than 1), and density gets 1000 (actual density should greater than 1000), equate with non-flow area as flow area, i.e. S
1=S
2, ε ≈ 0.125% so, this shows, and the air leak rate of air curtain of this preheater is very little.
More than the embodiment with two heat exchangers is illustrated, and in actual use, can adopt at least two heat exchangers or many groups mode in parallel to use, and just repeats no more here.
The utility model is not limited to above-mentioned preferred forms, and anyone can draw other various forms of products under enlightenment of the present invention.Though but on its shape or structure, do any variation, every identical with the utility model or akin technical scheme is all within its protection domain.
Claims (1)
1. New-type boiler air preheater, it is characterized in that, comprise two heat exchangers, be equipped with smoke discharging pipe and admission line on each heat exchanger, the smoke discharging pipe of two heat exchangers intersects by two connecting pipes and is communicated with, the admission line of two heat exchangers also intersects by two connecting pipes and is communicated with, and smoke discharging pipe and the admission line part between its two connecting pipes respectively are provided with valve, also are respectively equipped with valve on the connecting pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201286444U CN201072138Y (en) | 2007-09-10 | 2007-09-10 | Novel boiler air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201286444U CN201072138Y (en) | 2007-09-10 | 2007-09-10 | Novel boiler air preheater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201072138Y true CN201072138Y (en) | 2008-06-11 |
Family
ID=39550696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201286444U Expired - Fee Related CN201072138Y (en) | 2007-09-10 | 2007-09-10 | Novel boiler air preheater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201072138Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110062868A (en) * | 2016-12-21 | 2019-07-26 | 乔治洛德方法研究和开发液化空气有限公司 | Heat exchanger and the heat change method for using the heat exchanger |
-
2007
- 2007-09-10 CN CNU2007201286444U patent/CN201072138Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110062868A (en) * | 2016-12-21 | 2019-07-26 | 乔治洛德方法研究和开发液化空气有限公司 | Heat exchanger and the heat change method for using the heat exchanger |
| CN110062868B (en) * | 2016-12-21 | 2021-03-26 | 乔治洛德方法研究和开发液化空气有限公司 | Heat exchanger and heat exchange method using the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080611 |