CN109915845A - A kind of flue gas waste heat recovery and purification system - Google Patents
A kind of flue gas waste heat recovery and purification system Download PDFInfo
- Publication number
- CN109915845A CN109915845A CN201711314870.6A CN201711314870A CN109915845A CN 109915845 A CN109915845 A CN 109915845A CN 201711314870 A CN201711314870 A CN 201711314870A CN 109915845 A CN109915845 A CN 109915845A
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- China
- Prior art keywords
- flue gas
- heat exchanger
- heat
- water
- bubbling board
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- 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.)
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Links
- 239000003546 flue gas Substances 0.000 title claims abstract description 66
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 239000002918 waste heat Substances 0.000 title claims abstract description 21
- 238000000746 purification Methods 0.000 title claims abstract description 14
- 238000011084 recovery Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000007789 gas Substances 0.000 claims abstract description 21
- 230000005587 bubbling Effects 0.000 claims description 56
- 239000007788 liquid Substances 0.000 claims description 29
- 230000002093 peripheral effect Effects 0.000 claims description 16
- 238000010521 absorption reaction Methods 0.000 claims description 8
- 238000004064 recycling Methods 0.000 claims description 8
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 238000005192 partition Methods 0.000 claims description 3
- 235000019504 cigarettes Nutrition 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims 1
- 239000003517 fume Substances 0.000 abstract description 6
- 239000003344 environmental pollutant Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- 231100000719 pollutant Toxicity 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
The present invention provides a kind of flue gas waste heat recovery and purification systems, comprising: a first-class heat exchanger realizes the efficient heat exchange of boiler blow-down water and flue gas.One secondary heat exchanger absorbs the waste heat of flue gas further using air inlet Cryogenic air needed for boiler to realize low exhaust gas temperature.Air inlet Cryogenic air is heated, is humidified, and realizes heat recovery especially by humidification.Pollutant is simultaneously removed in heat transfer process in flue gas.By the system, it can be achieved that fume afterheat deep exploitation, and multiple pollutant is handled simultaneously.
Description
Technical field
The present invention relates to the recycling of fume afterheat depth, gaseous contamination improvement, gas cleaning, burning and exhausting waste gas purification.
Background technique
Human industry and life generate a large amount of flue gases, wherein containing the largely waste heat for utilizing.At present for waste heat
Recycling is general using in the way of boiler blow-down water and flue gas heat exchange, and exhaust gas temperature is generally all at 50 degrees Celsius or more.It is discharged fume
Still contain amount of heat in gas.Contain a large amount of vapor in the flue gas that especially such as combustion of natural gas generates, if can incite somebody to action
Exhaust gas temperature further decreases, and the vapor condensation in flue gas can discharge a large amount of latent heat.In the prior art, mostly by using heat
Pump technology further decreases return water temperature to reduce exhaust gas temperature, but costly.
Summary of the invention
The present invention provides a kind of gas cleaning and residual neat recovering system, it can be greatly lowered exhaust gas temperature, more than realization
The depth recycling of heat and the deep purifying of flue gas.
A kind of flue gas waste heat recovery and purification system, comprising: first-class heat exchanger (1) and secondary heat exchanger (2)；Level-one heat exchange
Device (1) is in flue gas upstream, and secondary heat exchanger (2) is in flue gas downstream；The secondary heat exchanger (2) includes absorb heat seperated (17)
Be humidified seperated (18)；Flue gas transfers heat to the water-bath (12) absorbed heat in seperated (17) in seperated (17) the interior bubbling that absorbs heat,
Then the heat of seperated (17) the interior water-bath (12) of heat absorption is transported to the water-bath (15) being humidified in seperated (18) by water circulation (16)；
The water-bath (15) being humidified in seperated (18) humidifies air inlet air by being bubbled.
Preferably, first-class heat exchanger (1) is initially entered from the high-temperature flue gas that boiler comes out, high-temperature flue gas is in first-class heat exchanger
(1) heat exchange is carried out in the return water of boiler, high-temperature flue gas transfers heat to return water and realizes waste heat recycling；Medium temperature after cooling
Flue gas enters back into secondary heat exchanger (2), in secondary heat exchanger (2), is used as intermediary with water-bath (12,15) and water circulation (16),
Low-humidity air needed for transferring heat to boiler combustion, while increasing the humidity of the low-humidity air.
Preferably, the first-class heat exchanger (1) is contact-partition composite heat-exchanger, and flue gas is by being bubbled heat transfer
To the water-bath (7) of first-class heat exchanger (1), the water-bath (7) of first-class heat exchanger (1) and bubble further transfer heat to return water and change
Heat pipe (8) is to increase return water temperature.
Preferably, the first-class heat exchanger (1) includes bubbling board (3), and bubbling board (3) is installed on the peripheral cavity
Inside, separates gas-liquid two-phase namely gas is located at below bubbling board (3), and liquid is located above bubbling board (3)；High-temperature flue gas from
Arrival end (5) enters the peripheral cavity, below bubbling board (3) by the blistering mouth (4) on bubbling board (3) generate bubble into
Enter liquid, is escaped later from outlet end (6).
Preferably, the heat absorption in the secondary heat exchanger (2) seperated (17) includes bubbling board (3), bubbling board (3) installation
In the inside of the peripheral cavity, separates gas-liquid two-phase namely gas is located at below bubbling board (3), liquid is located at bubbling board (3)
Top；Flue gas enters the peripheral cavity from arrival end (10), passes through the blistering mouth on bubbling board (3) below bubbling board (3)
(4) it generates bubble and enters liquid, escaped later from outlet end (11).
Preferably, the humidification in the secondary heat exchanger (2) seperated (18) includes bubbling board (3), bubbling board (3) installation
In the inside of the peripheral cavity, separates gas-liquid two-phase namely gas is located at below bubbling board (3), liquid is located at bubbling board (3)
Top；Flue gas enters the peripheral cavity from arrival end (13), passes through the blistering mouth on bubbling board (3) below bubbling board (3)
(4) it generates bubble and enters liquid, escaped later from outlet end (14).
Preferably, there is the fin (9) of multiple vertical directions on the return water heat exchanger tube (8) in first-class heat exchanger (1).
First-class heat exchanger is in flue gas upstream, and secondary heat exchanger is in flue gas downstream.The high-temperature flue gas come out from boiler is first
It is introduced into first-class heat exchanger, wherein heat exchange is being carried out with the return water of boiler, is transferring heat to boiler blow-down water.Cigarette after cooling
Gas travels further into secondary heat exchanger, wherein, using water-bath and water circulation as intermediary, transfers heat to needed for boiler combustion
Low-humidity air.Cryogenic air significantly absorbs waste heat energy by increasing water vapour content, then brings boiler into and realizes heat
Recycling.
Compared with prior art, the present invention includes the following advantages；
The present invention is combined by the split type secondary heat exchanger of bubbling-bubbling of novel and high-efficiency and enters the wind air low humidity needed for burning
The method of air realizes the discharged at lower temperature of flue gas.Flue gas in the heat absorption of secondary heat exchanger is seperated by being bubbled heat efficiently
Water-bath is passed to, then the heat of water-bath is delivered directly to the seperated water-bath of humidification by water circulation.Low temperature and low humidity air into
It first passes through before entering boiler combustion and is bubbled in the seperated water-bath of humidification, increase humidity and temperature, take away a large amount of latent heats of vaporization.From
And air inlet air needed for boiler combustion is utilized in one aspect of the present invention has the characteristics that low humidity, takes away greatly to be humidified to it
Measure waste heat.On the other hand, since the heat exchange driving temperature difference is very small, the exchange thermal efficiency proposes high requirement, drum of the invention
The split type secondary heat exchanger of bubble-bubbling reaches this requirement by gas-liquid direct contact heat transfer twice, and this point is existing
What wall type heat exchanger was difficult to reach.
In first-class heat exchanger, heat exchanger tube, which is directly embedded in, to be bubbled in water-bath, this heat exchange not having before being also design.
The direct contact heat transfer that flue gas and water-bath are carried out by being bubbled, is efficiently transmitted to water-bath for heat, then a large amount of bubbles wash away return water
Heat exchanger tube, violent flow field disturbance, the outer wall heat exchange efficiency of return water heat exchanger tube as caused by bubble are very high.On return water heat exchanger tube
There is the fin of multiple vertical directions, one side can cut bubble, reach better gas-liquid contact, on the other hand enhancing heat exchange
The outside wall surface of pipe exchanges heat.
Finally, flue gas is by after first-class heat exchanger, when being formed saturation wet flue gas, then passing through secondary heat exchanger,
Due to further cooling down, rapid condensation process will occur, be conducive to the pollutant in flue gas and condense removing of growing up.Effective gas-
Water contact can also effectively remove pollutant.
Detailed description of the invention
Fig. 1 is general structure schematic diagram of the present invention.
Fig. 2 is the structural schematic diagram of first-class heat exchanger of the invention (1).
Fig. 3 is the structural schematic diagram of secondary heat exchanger of the present invention (2).
Wherein, 1- first-class heat exchanger, 2- secondary heat exchanger, 3- bubbling board, 4- blistering mouth, 5- high-temperature flue gas entry end, 6-
Medium temperature smoke outlet, the water-bath of 7- first-class heat exchanger, 8- return water heat exchanger tube, 9- heat exchanger tube fin, 10- medium temperature smoke inlet end,
11- low-temperature flue gas outlet end, the seperated water-bath of 12- secondary heat exchanger heat absorption, 13- low-humidity air arrival end, the outlet of 14- humidifying air
End, 15- secondary heat exchanger are humidified, and water between seperated water-bath, 16- water-bath recycles, the heat absorption of 17- secondary heat exchanger is seperated, 18- second level is changed
Hot device humidification is seperated.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
The flue gas of natural gas boiler discharge contains a large amount of sensible heats and latent heat.In the present embodiment, burning is produced using the present invention
Raw flue gas carries out waste heat recycling.
As shown in Figure 1, 2, 3, the present invention provides a kind of utilization of fume afterheat and purification systems, to solve existing device
It has a single function, the problem that low efficiency, UTILIZATION OF VESIDUAL HEAT IN are insufficient.
Device includes that first-class heat exchanger (1) is in flue gas upstream, and secondary heat exchanger (2) is in flue gas downstream.Level-one heat exchange
Device (1) is contact-partition composite heat-exchanger, and flue gas transfers heat to the water-bath (7) of first-class heat exchanger (1) by being bubbled, one
The water-bath (7) of grade heat exchanger (1) and bubble transfer heat to return water heat exchanger tube (8) further to increase return water temperature.
Preferably, the first-class heat exchanger (1) includes bubbling board (3), and bubbling board (3) is installed on the peripheral cavity
Inside, separates gas-liquid two-phase namely gas is located at below bubbling board (3), and liquid is located above bubbling board (3)；High-temperature flue gas from
Arrival end (5) enters the peripheral cavity, below bubbling board (3) by the blistering mouth (4) on bubbling board (3) generate bubble into
Enter liquid, is escaped later from outlet end (6).
Secondary heat exchanger (2) includes absorbing heat seperated (17) and being humidified seperated (18)；Flue gas is in seperated (17) the interior bubbling that absorbs heat
The water-bath (12) absorbed heat in seperated (17) is transferred heat to, the heat for seperated (17) interior water-bath (12) of then absorbing heat is followed by water
Ring (16) is transported to the water-bath (15) being humidified in seperated (18)；The water-bath (15) being humidified in seperated (18) is empty to air inlet by being bubbled
Gas is humidified.
Preferably, the heat absorption in the secondary heat exchanger (2) seperated (17) includes bubbling board (3), bubbling board (3) installation
In the inside of the peripheral cavity, separates gas-liquid two-phase namely gas is located at below bubbling board (3), liquid is located at bubbling board (3)
Top；Flue gas enters the peripheral cavity from arrival end (10), passes through the blistering mouth on bubbling board (3) below bubbling board (3)
(4) it generates bubble and enters liquid, escaped later from outlet end (11).
Preferably, the humidification in the secondary heat exchanger (2) seperated (18) includes bubbling board (3), bubbling board (3) installation
In the inside of the peripheral cavity, separates gas-liquid two-phase namely gas is located at below bubbling board (3), liquid is located at bubbling board (3)
Top；Flue gas enters the peripheral cavity from arrival end (13), passes through the blistering mouth on bubbling board (3) below bubbling board (3)
(4) it generates bubble and enters liquid, escaped later from outlet end (14).
The high-temperature flue gas come out from boiler initially enters first-class heat exchanger (1), is wherein carrying out hot friendship with the return water of boiler
It changes, transfers heat to return water and realize waste heat recycling.Flue gas after cooling travels further into secondary heat exchanger (2), wherein, with
Water-bath and water circulation are used as intermediary, low-humidity air needed for transferring heat to boiler combustion.Low humidity is empty under the effect of this heat
Gas not only heats, but also increases water vapour content, brings boiler into and realizes heat recovery.
Due to efficiently exchanging heat, the flue gas that about 130 DEG C of entrance can finally become about 35 DEG C of low-temperature flue gas discharge.Sufficiently
Recycled fume afterheat, and low-humidity air is heated, is humidified, while also removing the pollutant in flue gas.
Above to a kind of flue gas waste heat recovery provided by the present invention and purification system fume treatment field application into
Introduction is gone.The above description of the embodiment is only used to help understand the method for the present invention and its core ideas；Its content is not answered
It is interpreted as limitation of the present invention.The term of positional relationship, such as "upper" "lower" " preceding " " rear " are indicated in the present invention, only indicate phase
To position, orientation is not limited specifically.
Claims (7)
1. a kind of flue gas waste heat recovery and purification system characterized by comprising first-class heat exchanger (1) and secondary heat exchanger
(2)；First-class heat exchanger (1) is in flue gas upstream, and secondary heat exchanger (2) is in flue gas downstream；The secondary heat exchanger (2) includes
It absorbs heat seperated (17) and is humidified seperated (18)；Flue gas transfers heat in heat absorption seperated (17) in seperated (17) interior be bubbled of absorbing heat
Water-bath (12), it is interior that the heat for seperated (17) interior water-bath (12) of then absorbing heat by water circulation (16) is transported to humidification seperated (18)
Water-bath (15)；The water-bath (15) being humidified in seperated (18) humidifies air inlet air by being bubbled.
2. flue gas waste heat recovery according to claim 1 and purification system, which is characterized in that the high temperature cigarette come out from boiler
Gas initially enters first-class heat exchanger (1), and high-temperature flue gas carries out heat exchange, high temperature with the return water of boiler in first-class heat exchanger (1)
Flue gas transfers heat to return water and realizes waste heat recycling；Medium temperature flue gas after cooling enters back into secondary heat exchanger (2), changes in second level
In hot device (2), intermediary is used as with water-bath (12,15) and water circulation (16), low humidity needed for transferring heat to boiler combustion is empty
Gas increases the humidity of the low-humidity air.
3. flue gas waste heat recovery according to claim 1 or 2 and purification system, which is characterized in that the first-class heat exchanger
It (1) is contact-partition composite heat-exchanger, flue gas transfers heat to the water-bath (7) of first-class heat exchanger (1), level-one by being bubbled
The water-bath (7) of heat exchanger (1) and bubble transfer heat to return water heat exchanger tube (8) further to increase return water temperature.
4. flue gas waste heat recovery according to claim 3 and purification system, which is characterized in that the first-class heat exchanger
It (1) include bubbling board (3), bubbling board (3) is installed on the inside of the peripheral cavity, separates gas-liquid two-phase namely gas is located at
Below bubbling board (3), liquid is located above bubbling board (3)；High-temperature flue gas enters the peripheral cavity from arrival end (5), is rising
Bubble is generated by the blistering mouth (4) on bubbling board (3) below bubble plate (3) and enters liquid, is escaped later from outlet end (6).
5. flue gas waste heat recovery according to claim 1 and purification system, which is characterized in that the secondary heat exchanger
(2) heat absorption seperated (17) in includes bubbling board (3), and bubbling board (3) is installed on the inside of the peripheral cavity, separates gas-liquid two
Phase namely gas are located at below bubbling board (3), and liquid is located above bubbling board (3)；Flue gas enters described outer from arrival end (10)
Enclosure cavity body generates bubble by the blistering mouth (4) on bubbling board (3) below bubbling board (3) and enters liquid, later from outlet end
(11) it escapes.
6. flue gas waste heat recovery according to claim 1 and purification system, which is characterized in that the secondary heat exchanger
(2) humidification seperated (18) in includes bubbling board (3), and bubbling board (3) is installed on the inside of the peripheral cavity, separates gas-liquid two
Phase namely gas are located at below bubbling board (3), and liquid is located above bubbling board (3)；Flue gas enters described outer from arrival end (13)
Enclosure cavity body generates bubble by the blistering mouth (4) on bubbling board (3) below bubbling board (3) and enters liquid, later from outlet end
(14) it escapes.
7. flue gas waste heat recovery according to claim 3 and purification system, which is characterized in that in first-class heat exchanger (1)
There is the fin (9) of multiple vertical directions on return water heat exchanger tube (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711314870.6A CN109915845A (en) | 2017-12-12 | 2017-12-12 | A kind of flue gas waste heat recovery and purification system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711314870.6A CN109915845A (en) | 2017-12-12 | 2017-12-12 | A kind of flue gas waste heat recovery and purification system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109915845A true CN109915845A (en) | 2019-06-21 |
Family
ID=66957465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711314870.6A Pending CN109915845A (en) | 2017-12-12 | 2017-12-12 | A kind of flue gas waste heat recovery and purification system |
Country Status (1)
| Country | Link |
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| CN (1) | CN109915845A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110762512A (en) * | 2019-10-28 | 2020-02-07 | 上海浩用工业炉有限公司 | Deep energy-saving waste heat recovery system and method for tubular heating furnace |
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Effective date of registration: 20230307 Address after: No. 308, Floor 7, Building 1, No. 158, West Fourth Ring Road North, Haidian District, Beijing, 100142 Applicant after: Fute Carbon (Beijing) Technology Co.,Ltd. Address before: 301, Founder Building, 298 Chengfu Road, Haidian District, Beijing, 100871 Applicant before: AER TECHNOLODY(BEIJING) Co.,Ltd. |