CN207439235U - A kind of MGGH heat exchangers for preventing resonance - Google Patents
A kind of MGGH heat exchangers for preventing resonance Download PDFInfo
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- CN207439235U CN207439235U CN201721221819.6U CN201721221819U CN207439235U CN 207439235 U CN207439235 U CN 207439235U CN 201721221819 U CN201721221819 U CN 201721221819U CN 207439235 U CN207439235 U CN 207439235U
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Abstract
A kind of MGGH heat exchangers for preventing resonance, the MGGH heat exchangers include the MGGH modules (1) of housing (2) and several superpositions up and down in it, the MGGH modules again by it is several it is parallel be sequentially communicated heat exchanger tubes row form, flue gas flow through heat exchanger tube row between with flow through heat exchanger tube row in heat medium water carry out air water heat exchange；It is characterized in that：Between the module, rectangle weakening partition plate (3) is equipped with along the part of module parallel to airflow direction, the partition plate is fixed in its lower module or module thereon.Between the utility model by weakening partition plate by being inserted into Tube Sheet of Heat Exchanger row, change the air-column inherent frequency of heat exchanger flue, eliminate the resonance of MGGH flues；It is modularized production to take into account the MGGH heat exchangers to have put into operation simultaneously, is limited by internal structure, and weakening partition plate is positioned only at the boundary position of two modules, and transformation is implemented simply, and investment is small, reduces MGGH vibration equipments.
Description
Technical field
The utility model is related to a kind of MGGH heat exchangers for preventing resonance.
Background technology
In minimum discharge transformation is implemented, due to the swinging gas-to-gas heat exchanger of wet desulfurization system Central Plains setting
(GGH) device air leak rate of air curtain reaches 1-3%, for the SO after desulfurization2Concentration of emission has larger impact, it is difficult to meet at this stage ultralow
Emission request.It is most of using in MGGH technical substitution original desulphurization systems at present during domestic progress minimum discharge transformation project
GGH devices are transformed, the core technology as flue gas collaboration Treatment process route.
MGGH heat exchangers be it is a kind of based on hot media for carrier fume afterheat utilize gas-gas heat exchange device.MGGH exchanges heat
Device has two-stage heat exchanger, and first order heat exchanger absorption high-temperature flue gas transfers heat to the water (air water heat exchange) in pipe, water cycle
To second level heat exchanger, low-temperature flue gas (air water heat exchange) is transferred heat to.Overall process is the heat transfer by water in pipe
Realize the gas-gas heat exchange between high-temperature flue gas and low-temperature flue gas.
Heat pipe in heat exchanger is generally made of pipe and internal working fluid (being typically water).Usual cooling heat exchanger is set
It puts after boiler air preheater, temperature rise heat exchanger is arranged on desulfuration absorbing tower outlet, first with air preheater flue gas work
Make liquid, by circulating, working fluid recycles the neat stress that self-contained heat desulfurizing tower comes out, and has cigarette
The advantage that cold flue gas reheating is completed independently of each other after gas waste heat recovery and desulfurization.It both improves dust collection efficiency, and can be promoted
SO3Removal rate solves SO3The problem of corrosion there is not yet the SO that swinging GGH faces2The problems such as leakage, shows good
Energy-saving and environmental protection effect, application of succeeding at home on Large-scale machine set.
However in terms of the transformation project to have put into operation in recent years, the secondary heat exchangers of part MGGH heat exchangers since flue is big,
There are vibration problems, influence the long-term safety stable operation of unit.
Utility model content
Technical problem to be solved in the utility model is just to provide a kind of MGGH heat exchangers for preventing resonance, energy
It effectively prevents MGGH heat exchangers flue from generating strong standing acoustic waves resonance and live intense noise, and simply easily implements, investment
It is few.
Above-mentioned technical problem is solved, technical solution is as follows used by the utility model：
A kind of MGGH heat exchangers for preventing resonance, if the MGGH heat exchangers include housing 2 and in it
The MGGH modules 1 of dry superposition up and down, the MGGH modules are made of again several parallel heat exchanger tube rows being sequentially communicated, flue gas
Flow through heat exchanger tube row between with flow through heat exchanger tube row in heat medium water carry out air water heat exchange；It is characterized in that：The module it
Between, it is fixed with rectangle weakening partition plate 3 along parallel to airflow direction, the partition plate is fixed on its lower module or module thereon
On.
The partition plate 3 is that partition plate is fixed on pipe using U-shaped anchor ear.
The weakening partition plate quantity is determined according to frequency and exponent number that air column vibration occurs：When flue gas transversal flow heat-transfer surface
Tube bank, the Von Karman vortices triggered are come off with certain cycle, when frequency (the excitation frequency for the flue gas pressures ripple that Von Karman vortices are formed
Rate) when being coupled with certain single order flue gas column intrinsic frequency, strong standing acoustic waves resonance will be generated in flue and is sent strong
Noise sound.
Theoretical calculation Von Karman vortices shedding frequence is：
In formula：S-Strouhal number；U-fluid velocity, m/s；D-caliber, m.
Theoretical calculation flue air-column inherent frequency is calculated as follows：
In formula：The order of n-ripple；C-flue gas velocity of sound, m/s；The width of W-flue cavity, m.).
N=1,2,3 ... are substituted into, obtain the value of n when fn and fs coincides；
Flue is separated into N number of small flue (N=n+1) according to flue air-column inherent frequency and wavelength again, and by partition plate
It is installed at wave crest or trough, avoids displacement node, to improve flue transverse direction standing acoustic waves frequency, avoid resonance region.
The weakening baffle arrangement in pressure waveform node (physics appellation " node ", also referred to as pressure node/stationary point,
Displacement node, that is, position when the amplitude of ripple is zero) position, it is smaller than 1/2 vibration wavelength.(corresponding different n values, the position
Also different, such as n=1 (namely half-wave or 1/2 ripple) is put, then weakening baffle arrangement can change flue in any position
Air-column inherent frequency, optimal weakening partition position are located at flue center, the i.e. crest location of displacement wave mode, pressure wave mode
Node location；For n=2, the weakening partition plate in flue center does not have any weakening to act on, because flue center is exactly staying for ripple
Point, optimal weakening partition position is located at 1/4 flue namely 1/2 vibration wavelength.)
The weakening partition plate is made according to internal combination is entered after the partition of site examining and repairing manhole door size convenient for narrow space
Industry is finally combined into across being welded with across adjacent separator both ends, be reliably connected partition room.
The air-column inherent frequency of heat exchanger flue is so changed, the generation that flue standing acoustic waves is avoided to resonate, and improve
Measure is simple, scientific and reasonable.
Advantageous effect：Between the utility model by weakening partition plate by being inserted into Tube Sheet of Heat Exchanger row, change heat exchanger flue
Air-column inherent frequency eliminates the resonance of MGGH flues；It is module metaplasia to take into account the MGGH heat exchangers to have put into operation simultaneously
Production, is limited by internal structure, and weakening partition plate is positioned only at the boundary position of two modules, and transformation is implemented simply, and investment is small, reduces
MGGH vibration equipments.
Description of the drawings
Fig. 1 is the structural front view of the utility model embodiment；
Fig. 2 is that Fig. 1 eliminates bearing diagonal and riser to show the view of installation partition position；
Fig. 3 is the concrete structure schematic diagram of Fig. 1；
Fig. 4 is the left view of Fig. 3.
Reference numeral refers to as follows in figure：1-MGGH modules, 2-MGGH heat exchanger shells, 3- weakening partition plates.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.
It is as shown in Figures 1 to 4 the MGGH heat exchanger embodiments for preventing resonance of the utility model, the MGGH is changed
Hot device include housing 2 and in it is several up and down superposition MGGH modules 1, MGGH modules be again by it is several it is parallel according to
Heat exchanger tube row's composition of secondary connection, flue gas change between flowing through heat exchanger tube row with the heat medium water progress air water flowed through in heat exchanger tube row
Heat.
Between MGGH modules 1, along rectangle weakening partition plate 3 is fixed with parallel to airflow direction, partition plate is fixed on it
On lower module or module thereon.Partition plate is that partition plate is fixed on pipe using U-shaped anchor ear.
Weakening partition plate quantity is determined according to frequency and exponent number that air column vibration occurs.
Theoretical calculation Von Karman vortices shedding frequence is：
In formula：S-Strouhal number；U-fluid velocity, m/s；D-caliber, m.
Theoretical calculation flue air-column inherent frequency is calculated as follows：
In formula：The order of n-ripple；C-flue gas velocity of sound, m/s；The width of W-flue cavity, m.).
N=1,2,3 ... are substituted into, obtain the value of n when fn and fs coincides.
Flue is separated into N number of small flue (N=n+1) according to flue air-column inherent frequency and wavelength again, and by partition plate
It is installed at wave crest or trough, avoids displacement node, to improve flue transverse direction standing acoustic waves frequency, avoid resonance region.
Weakening baffle arrangement is in the node location of pressure waveform.Physics appellation is all pressure section " node ", in the past spoken language
The position when amplitude of point/stationary point, displacement node, that is, ripple is zero.
Weakening partition plate is smaller than 1/2 vibration wavelength.Corresponding different n values, the position is also different, such as n=1 is (also
It is half-wave or 1/2 ripple), then weakening baffle arrangement can change flue air-column inherent frequency in any position.Optimal weakening
Partition position is located at flue center, the i.e. crest location of displacement wave mode, the node location of pressure wave mode；For n=2, in flue
The weakening partition plate of centre does not have any weakening to act on, because flue center is exactly the stationary point of ripple, optimal weakening partition position
At 1/4 flue namely 1/2 vibration wavelength.
Weakening partition plate can enter internal combination according to site examining and repairing manhole door size, convenient for narrow space operation, last group
Synthesis with across adjacent separator both ends across being welded, be reliably connected partition room.
The heat exchanger short transverse of the present embodiment is divided into 8 modules, and each high 1.5m of module is limited by this MGGH internal structures
System, weakening partition plate can only be arranged on the boundary position of upper and lower two module.
By measuring, calculating heat exchanger Von Karman vortices excited frequency and flue air-column inherent frequency, determine that flue air column is total to
Shake exponent number.
Through survey calculation present case MGGH be 3 rank air column stationary wave vibrations, along flue height direction formed four displacement stationary points,
Three pressure nodes.
For three pressure nodes respectively at 1/6,1/2 and the 5/6 of flue width, resonance exciting source wavelength is 2/3 flue
Highly, if setting partition plates in three pressure nodes, for maximum partition room away from for 1/3 flue height, maximum partition plate is smaller than 1/2
Vibration wavelength, wavelength is equal to 2/3 flue height during 3 rank, thus maximum partition room away from=1/2 × 2/3 flue height=1/3 flue
Highly, single order air-column inherent frequency is overlapped with exciting source frequency.Therefore, it is necessary to respectively increase in 1/6-1/2 and 1/2-5/6 partition rooms
If one piece of partition plate, be exactly every 1/6 flue width at set one piece of partition plate, need altogether set 5 pieces of partition plates.
To reduce weakening partition plate quantity to the greatest extent, the number of further analysis and regulation weakening partition plate can be passed through.It is determined in adjustment
During the position of weakening partition plate, it is necessary to which frequency and exponent number according to air column vibration occurs determine partition plate number, and minimum partition plate number is root
Come according to the frequency of flue gas velocity of sound and generation air column vibration definite.
With in the flue of 8 modules of embodiment, short transverse totally sets 5 pieces of partition plates, to reduce weakening partition plate quantity, adopt
With discontinuous arrangement is segmented, Fig. 2 is seen, totally 15 pieces, maximum cavity spacing is three modules, is consolidated by calculating flue single order air column
There is frequency between not adding before partition plate between 2,3 rank air-column inherent frequencies, can so vibrate and occur to avoid air column.
The present embodiment has reached the resonance for preventing MGGH heat exchangers by the reasonable Arrangement to weakening partition plate, implement it is simple,
MGGH equipment can be protected, it is ensured that the safe and stable operation of system.
Claims (3)
1. a kind of MGGH heat exchangers for preventing resonance, the MGGH heat exchangers include housing（2）If in it
The MGGH modules of dry superposition up and down（1）, the MGGH modules are arranged again by several parallel heat exchanger tubes being sequentially communicated to be formed, cigarette
Gas flow through heat exchanger tube row between with flow through heat exchanger tube row in heat medium water carry out air water heat exchange；It is characterized in that：In the MGGH
Between module, rectangle weakening partition plate is equipped with along the part of module parallel to airflow direction（3）, the partition plate is fixed under it
In MGGH modules or MGGH modules thereon.
2. the MGGH heat exchangers according to claim 1 for preventing resonance, it is characterized in that：The partition plate（3）It is using U
Type anchor ear is fixed on pipe.
3. the MGGH heat exchangers according to claim 1 for preventing resonance, it is characterized in that：The weakening baffle arrangement is in pressure
The node location of Reeb shape is smaller than 1/2 vibration wavelength.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721221819.6U CN207439235U (en) | 2017-09-22 | 2017-09-22 | A kind of MGGH heat exchangers for preventing resonance |
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| CN201721221819.6U CN207439235U (en) | 2017-09-22 | 2017-09-22 | A kind of MGGH heat exchangers for preventing resonance |
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| CN207439235U true CN207439235U (en) | 2018-06-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060793A (en) * | 2021-11-30 | 2022-02-18 | 浦湘生物能源股份有限公司 | Vibration suppression method and suppression device for economizer of waste heat boiler of waste incineration plant |
-
2017
- 2017-09-22 CN CN201721221819.6U patent/CN207439235U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060793A (en) * | 2021-11-30 | 2022-02-18 | 浦湘生物能源股份有限公司 | Vibration suppression method and suppression device for economizer of waste heat boiler of waste incineration plant |
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