CN109900143A - A kind of heat exchanger and heat-exchange method for flue gas heat exchange - Google Patents
A kind of heat exchanger and heat-exchange method for flue gas heat exchange Download PDFInfo
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- CN109900143A CN109900143A CN201910249076.0A CN201910249076A CN109900143A CN 109900143 A CN109900143 A CN 109900143A CN 201910249076 A CN201910249076 A CN 201910249076A CN 109900143 A CN109900143 A CN 109900143A
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Abstract
The present invention provides a kind of heat exchangers and heat-exchange method for flue gas heat exchange, the heat exchanger includes cylindrical heat exchanger main body (6), gas inlet (1) and exhanst gas outlet (4) is axially respectively set in (6) two lateral edge of heat exchanger main body, it is internal that flue gas flow channel (5) passes through heat exchanger main body (6), heat exchanger tube (3) are generally axially set in flue gas flow channel (5), and in the heat exchanger main body (6), the space of flue (5) outside forms and pour gas flow (2)；Flue gas is passed through through gas inlet (1), flue gas flow channel (5) are flowed through through flue gas flow channel entrance (51), by heat exchanger tube (3) and/or after pouring the heat transferring medium cooling being passed through in gas flow (2), it is discharged through flue gas flow channel outlet (52) by exhanst gas outlet (4).In the present invention, which, which enables to that working fluid stroke in heat exchanger is uniformly distributed, speed is uniform, heat exchange efficiency is high and resistance is lower, is efficiently modified to existing heat exchanger.
Description
Technical field
The present invention relates to the fields such as refrigeration, industrial refrigeration, air-conditioning, heating, and in particular to a kind of changing for flue gas heat exchange
Hot device and heat-exchange method.
Background technique
Existing heat exchanger is generally traditional Pipe bundle structure, as shown in Figure 1, a large amount of convection banks are arranged, flue gas is wherein
When stroke is by gap between pipe transverse direction and longitudinal direction, rotation can be generated, shunting converges etc. " sinuous flow " and leads to flue gas resistance
It is higher；And due to smoke entrance height, size, structure limitation etc., there are local sweep of gases less than it is so-called " dead empty
Between " cause the coefficient of heat transfer uneven and keep total average heat transfer coefficient relatively low；Sometimes due to convection bank length is longer or flue gas is fast
Spend it is higher, it is interbank away from the vibration for arranging that the reasons such as unreasonable lead to convection bank, endanger operational safety；In convection bank,
Since flue gas is gradually cooled, flowing velocity is gradually reduced, and leads to the reduction of the end heat exchanger tube coefficient of heat transfer.
Summary of the invention
It is an object of the invention to solve, the above-mentioned flue gas resistance being related to is higher, heat exchanger has " dead space " causes to exchange heat
The coefficient of heat transfer caused by coefficient is uneven, latter end flow of flue gas speed reduces is lower and heat exchanger tube hazard of vibration operational safety is asked
At least one of topic.
In order to solve the problems in the existing technology, present inventor has performed sharp studies, provide a kind of for flue gas
The heat exchanger of heat exchange, is uniformly distributed several flue gas flow channels in the heat exchanger, and flue gas is by the flue gas flow channel that is evenly arranged by wherein
The heat exchanger tube of arrangement and/or the heat transferring medium poured in gas flow outside it are discharged after cooling down, and exchange heat pipe and provide limit
With rigidity reinforced measure, its vibration is avoided.The heat exchanger structure is novel, enables to working fluid stroke in heat exchanger uniform
Distribution, speed is uniform, heat exchange efficiency is high and resistance is lower, and operational safety, thereby completing the present invention.
The purpose of the present invention is to provide following technical schemes:
(1) a kind of heat exchanger for flue gas heat exchange, which includes cylindrical heat exchanger main body 6, in heat exchanger main body 6
Gas inlet 1 and exhanst gas outlet 4 is axially respectively set in two lateral edges, opens up flue gas on 6 side wall of gas inlet side heat exchanger main body
Flow channel entry point 51, flue gas flow channel 5 pass through heat exchanger body interior, open up flue gas on 6 side wall of exhanst gas outlet side heat exchanger main body
Heat exchanger tube 3 is generally axially arranged in runner exit 52 in flue gas flow channel 5, the sky in heat exchanger main body 6, outside flue 5
Between formed pour gas flow 2；
Flue gas is passed through through gas inlet 1, is flowed through flue gas flow channel 5 through flue gas flow channel entrance 51, by heat exchanger tube 3 and/or is poured
After the heat transferring medium being passed through in gas flow 2 is cooling, it is discharged through flue gas flow channel outlet 52 by exhanst gas outlet 4.
(2) a kind of heat-exchange method, this method includes by flue gas by equally distributed flue gas flow channel in heat exchanger, after cooling
Heat exchanger is discharged；
Preferably, which is the heat exchanger that flue gas heat exchange is used in above-mentioned (1).
A kind of heat exchanger and heat-exchange method for flue gas heat exchange provided according to the present invention, has the advantages that
(1) in the present invention, several flue gas flow channels are uniformly distributed in the heat exchanger main body of heat exchanger, flue gas is by being evenly arranged
Flue gas flow channel, air current composition is uniform, and stroke is smooth intuitive, and the stroke length of every flue gas flow channel is substantially suitable, compared to passing
Uniting, its flue gas resistance of convection bank structure is lower and the coefficient of heat transfer is higher.
(2) in the present invention, pour in gas flow, the ring cross-section diameter of heat exchanger tube border with flow of flue gas direction by
It is decrescence small, and/or pour gas flow and reduce along Cheng Kuandu, enable to end flue gas stream still to keep certain speed to keep
Heat transfer effect.
(3) it in the present invention, pours and is disposed with several bulge-structures in gas flow, and/or be disposed in heat exchange pipe outer wall
Several bulge-structures avoid convection bank due to tube bank length, tube bank arrangement, flue gas to support heat exchanger tube to reinforce its rigidity
The vibration problem that speed height etc. is likely to occur.
Detailed description of the invention
Fig. 1 shows the structural schematic diagram of heat exchanger in background technique；
Fig. 2 shows a kind of longitudinal sectional drawings and transverse cross-sectional view of the heat exchanger of preferred embodiment according to the present invention；
Fig. 3 shows a kind of transverse cross-sectional view of the heat exchanger of preferred embodiment according to the present invention, wherein heat exchanger tube border
Ring cross-section diameter be gradually reduced with flow of flue gas direction；
Fig. 4 shows a kind of transverse cross-sectional view of the heat exchanger of preferred embodiment according to the present invention, wherein pours gas stream
Several bulge-structures are disposed in road；
Fig. 5 shows a kind of transverse cross-sectional view of the heat exchanger of preferred embodiment according to the present invention, wherein heat exchange pipe outer wall
On be disposed with several bulge-structures.
Drawing reference numeral explanation:
1- gas inlet；
2- pours gas flow；
3- heat exchanger tube；
4- exhanst gas outlet；
5- flue gas flow channel；
51- flue gas flow channel entrance；
The outlet of 52- flue gas flow channel；
6- heat exchanger main body.
7- bulge-structure I；
8- bulge-structure II.
Specific embodiment
Below by drawings and examples, the present invention is described in more detail.Illustrated by these, the features of the present invention
It will be become more apparent from advantage clear.
Dedicated word " exemplary " means " being used as example, embodiment or illustrative " herein.Here as " exemplary "
Illustrated any embodiment should not necessarily be construed as preferred or advantageous over other embodiments.
As shown in Fig. 2, the present invention provides a kind of heat exchanger for flue gas heat exchange, which includes cylindrical heat exchanger
Gas inlet 1 and exhanst gas outlet 4 is axially respectively set in 6 liang of lateral edges of heat exchanger main body, in gas inlet side heat exchanger in main body 6
Flue gas flow channel entrance 51 is opened up on 6 side wall of main body, flue gas flow channel 5 passes through heat exchanger body interior, in exhanst gas outlet side heat exchanger
Flue gas flow channel outlet 52 is opened up on 6 side wall of main body, and heat exchanger tube 3 is generally axially set in flue gas flow channel 5, in heat exchanger main body
Space in 6, outside flue 5, which is formed, pours gas flow 2；Flue gas is passed through through gas inlet 1, is flowed through flue gas flow channel entrance 51
It is exported by heat exchanger tube 3 and/or after pouring the heat transferring medium cooling being passed through in gas flow 2 through flue gas flow channel through flue gas flow channel 5
52 are discharged by exhanst gas outlet 4.
In the present invention, heat exchanger main body 6 has constructed the main body and external structure of heat exchanger, and heat exchanger main body 6 is tubular knot
Structure, preferably axially symmetrical structure, if cylinder, positive rib cylinder (such as positive trigone cylinder, just tetragonous cylinder), cross section are ellipse
Cylinder, cross section be fan-shaped cylinder etc., more preferably cylinder.
In the present invention, pouring gas flow 2 can be entity structure, that is, it is real for pouring 2 structural body of gas flow itself
The structure of the heart, at this point, pouring gas flow 2 primarily serves supporting role to other structures, such as to flue gas flow channel 5 and heat exchange
Pipe 3 forms limit and protection etc..
Pouring gas flow 2 can also be shell structure, that is, pouring 2 structural body of gas flow itself is hollow structure,
At this point, flue gas flow channel 5 is the structure (runner that such as plate surrounds) being individually formed, pours also be passed through in gas flow 2 and change
Thermal medium, heat transferring medium is along axial circulation, with the flue gas heat exchange to circulate in flue gas flow channel 5.
Pouring the heat transferring medium in gas flow 2 can be liquid heat transfer medium or gas heat exchange medium, and liquid heat exchange is situated between
Matter such as cold water, gas heat exchange medium such as low-temperature flue gas.
In a kind of preferred embodiment of the present invention, the flue gas flow channel entrance 51 of flue gas flow channel 5 falls into gas inlet 1
In, flue gas flow channel outlet 52 is fallen into exhanst gas outlet 4.Preferably, all flue gas flow channel entrances 51 are each fallen in gas inlet 1,
All flue gas flow channel outlets 52 are each fallen in exhanst gas outlet 4.
Flue gas flow channel 5 is uniformly distributed in heat exchanger main body 6, to reduce since coefficient of heat transfer unevenness causes " dead space " to deposit
Risk.
Preferably, the runner stroke of every flue gas flow channel 5 is close；Number of heat exchange tubes in every flue gas flow channel 5 is close, excellent
Select the number of heat exchange tubes in every flue gas flow channel 5 identical.
It is highly preferred that not being connected between each flue gas flow channel 5, it is independent gas flow.
Flue gas flow channel 5 is evenly arranged, and the stroke length of every flue gas flow channel 5 is substantially suitable, so that flue gas passes through flue gas
Runner 5, air current composition is uniform, and stroke is smooth intuitive, compares conventional convection Pipe bundle structure, and flue gas flows on the path of setting
It is logical, it solves flue gas generation at the gap that stroke in heat exchanger passes through between heat exchanger tube transverse direction and longitudinal direction and rotates, shunts, converges
Lead to the higher problem of flue gas resistance Deng " sinuous flow ", while flue gas heat exchange coefficient is higher.
In the present invention, heat exchanger tube 3 is preferably generally axially arranged in flue gas flow channel 5.In addition to this, heat exchanger tube 3 is gone back
It can be arranged with vertical axial direction, and heat exchanger tube path can be straight line or curve, pass through heat transfer or heat radiation, heat exchanger tube
In heat transferring medium exchange heat with the flue gas in flue gas flow channel 5.
For example, heat exchanger tube 3 can be sheathed on the internal or external of flue gas flow channel 5, heat transferring medium is in heat exchanger tube 3 and cigarette
It circulates in the channel formed between flow channel 5, with the flue gas heat exchange in flue gas flow channel 5.
In the present invention, heat exchanger tube 3 is uniformly distributed in heat exchanger main body 6, improves the uniformity of heat exchange, preferred heat exchanger
When main body 6 is axially symmetric structure, heat exchanger tube 3 is in heat exchanger main body 6 along its symmetry axis symmetry arrangement.
In a kind of preferred embodiment of the present invention, pouring gas flow 2 is cylindrical body, and heat exchanger tube 3 includes axial sets
Set be located at heat exchanger main body 6 hit exactly 1 center heat exchanger tube, around center heat exchanger tube 6 I grade heat exchanger tubes and surround I
13 II grades of heat exchanger tubes of grade heat exchanger tube, the distance between each I grades of heat exchanger tube is close, the distance between each II grades of heat exchanger tube phase
Closely, I grades of heat exchanger tubes and II grades of heat exchanger tubes are distributed with axial symmetry.Four independent flue gas flow channels 5 of formation in gas flow 2 are poured,
It include 5 heat exchanger tubes 3 in every flue gas flow channel 5, the principle that flue gas flow channel 5 is connected to heat exchanger tube 3 is nearby principle and each flue gas
The process phase approximately principle of runner 5.
In the present invention, heat exchanger tube 3 may be designed as light pipe, screwed pipe, flat tube, finned tube or other shape tubes.
In a kind of preferred embodiment of the present invention, on flue gas circulating direction, the flue gas flow channel of nearly 3 two sides of heat exchanger tube
5 width is not more than the maximum radial width of heat exchanger tube 3, expands to form encirclement heat exchange by 5 part of flue gas flow channel of heat exchanger tube 3
The annular runner of pipe 3, flue gas shunt when passing through heat exchanger tube 3, contact with 3 entirety of heat exchanger tube, high efficient heat exchanging.Annular runner it is transversal
Area can be circular ring shape, oval ring, side's annular, polygonal annular etc., it is not limited here, but preferably circular ring shape, reduction
Flue gas circulating resistance.
For example, expanding to form encirclement heat exchange by 5 part of flue gas flow channel of heat exchanger tube 3 when heat exchanger tube 3 is round tube
The circular runner of pipe 3 can contact when flue gas passes through heat exchanger tube 3 with 3 entirety of heat exchanger tube.
In the present invention, the heat transferring medium in heat exchanger tube 3 can be liquid heat transfer medium or gas heat exchange medium, and liquid changes
Thermal medium such as cold water, gas heat exchange medium such as low-temperature flue gas.According to the use environment of heat exchanger tube, heat transferring medium can be selected freely
It selects.
The present inventor by heat exchanger in the prior art the study found that in convection bank, due to flue gas gradually by
Cooling, flowing velocity is gradually reduced, and the end coefficient of heat transfer is greatly reduced, and overall heat exchange coefficient is low, and heat exchanger heat exchange is uneven.For
Solve the problems, such as this, current inventor provides following implementation.
As shown in figure 3, flue gas flow channel 5 is constant along Cheng Kuandu, heat exchanger tube 3 in a kind of preferred embodiment of the present invention
The section of the flue gas flow channel part (preferably the runner section be annular channel) of periphery is gradually reduced with flow of flue gas direction, with
Keep flue gas flow rate basicly stable, and end flue gas stream still keeps certain speed to keep heat transfer effect.
In yet another preferred embodiment of the present invention, flue gas flow channel part (preferably flow path portion of 3 periphery of heat exchanger tube
Be divided into annular channel) section it is identical, flue gas flow channel 5 along Cheng Kuandu as flow of flue gas direction is gradually reduced, cross section of fluid channel product
It is gradually reduced with the stroke of flue gas, so that end flue gas stream still keeps certain speed.
In yet another preferred embodiment of the present invention, flue gas flow channel part (preferably flow path portion of 3 periphery of heat exchanger tube
Be divided into annular channel) section and flue gas flow channel 5 along Cheng Kuandu as flow of flue gas direction is gradually reduced, to keep enough
Eroding velocity and heat transfer effect.
The present inventor is the study found that in the prior art, the length of heat exchanger tube is longer, velocity of flue gas is higher or heat exchanger tube
When spacing arrangement is unreasonable, it is easy to cause the vibration of convection tube, endangers operational safety.The present invention is by controlling flue gas
In flue gas flow channel and heat exchanger tube is evenly arranged the vibration that heat exchanger tube can be effectively suppressed.Meanwhile present inventor has performed into
The research of one step, exchange heat pipe is implemented to reinforce limit or enhances its rigidity, to reduce under emergency situations (such as flue gas flow rate mutation)
The extent of vibration of convection tube further increases heat exchanger tube safety.
As shown in figure 4, the flue gas flow channel part of 3 periphery of heat exchanger tube is (preferably in a kind of preferred embodiment of the present invention
The runner section be annular channel) on be disposed with several bulge-structure I 7 towards heat exchanger tube 3 to support heat exchanger tube 3.
As shown in figure 5, being disposed with several directions on 3 outer wall of heat exchanger tube in another preferred embodiment of the present invention
The bulge-structure II 8 of flue gas flow channel 5, bulge-structure II 8 shorten (or even cancellation) between heat exchanger tube 3 and flue gas flow channel 5
Distance, exchange heat pipe 3 play position-limiting action.
When bulge-structure II 8 is strip projected parts, bulge-structure II 8 can also be further used as stiffener enhancing and change
The intensity of heat pipe 3.
Bulge-structure I 7 or bulge-structure II 8 can discontinuity connection heat exchanger tube 3 and flue gas flow channel 5, play absolute limit
The effect of position；Alternatively, bulge-structure I 7 or bulge-structure II 8 are not connected to heat exchanger tube 3 and flue gas flow channel 5, relative limit is played
Effect.It should be understood that when bulge-structure I 7 or 8 discontinuity of bulge-structure II connection heat exchanger tube 3 and flue gas stream
When road 5, the setting of bulge-structure I 7 or bulge-structure II 8 will not the circulation to flue gas in any side generate absolutely obstruction.
Preferably, bulge-structure I 7 or bulge-structure II 8 are not connected to heat exchanger tube 3 and flue gas flow channel 5, to reduce manufacture
Technology difficulty.
In further preferred embodiment, bulge-structure I 7 or bulge-structure II 8 can for dot bulge structure,
Axial strip bulge-structure, radial strip projected parts structure, it is random/without specific direction strip projected parts structure etc..
It is worth noting that, the setting of bulge-structure can generate disturbance to the flue gas in flue gas flow channel 5, reduce flue gas stream
Boundary layer thermal resistance in road 5, augmentation of heat transfer improve heat exchange efficiency, while again unlikely making excessively high (the especially bulge-structure of flue gas resistance
When playing relative limit), it influences flue gas and normally circulates, the intensity of flow-disturbing can be adjusted by changing the size of bulge-structure
It is whole.
In the present invention, the heat exchanger main body 6, pour the material of gas flow 2 and flue gas flow channel 5 according to the cigarette being passed through
Temperature degree difference may be designed as plastics (20-80 DEG C of temperature range), glass (30-150 DEG C of temperature range), cast iron (temperature model
Enclose 100-400 DEG C), cast aluminium (30-400 DEG C of temperature range), cast steel (50-450 DEG C of temperature range) and steel alloy (temperature model
Enclose 450-1250 DEG C) etc..
It hereinbefore mentions, pouring gas flow 2 can also be shell structure, that is, pour 2 structural body of gas flow itself
It is hollow structure, at this moment flue gas flow channel 5 is the structure (runner that such as plate surrounds) being individually formed, and pours gas flow 2 not
Fixation/supporting role is risen to flue gas flow channel 5.At this point, flue gas flow channel 5 is positioned and is fixed by external frame.
In the present invention, heat exchanger tube 3 is fixed in flue gas flow channel 5 by external frame.
In the present invention, heat exchanger tube 3 is in the equipment such as air preheater, flue gas/water- to-water heat exchanger.
In the present invention, which is used not only for the heat exchange of flue gas, additionally it is possible to implement other gaseous fluids or liquid
The heat exchange of body fluid.High-temperature gas can be not only passed through in flue gas flow channel, cryogenic gas, high-temp liquid, cryogenic liquid are also the same
It is applicable in.
Another aspect of the present invention is, provides a kind of method for enhancing flue gas heat exchange, this method includes passing through flue gas
Heat exchanger is discharged after cooling in equally distributed several flue gas flow channels in heat exchanger.
Preferably, which is the above-mentioned heat exchanger for flue gas heat exchange.
In the present invention, which is suitable for 1~30m/s of flow velocity, 20~1250 DEG C of flue gas.
Embodiment
Embodiment 1-1
As shown in Fig. 2, a kind of heat exchanger of gas flow and the heat-exchange method using the heat exchanger, the heat exchanger is as cigarette
Gas water heat exchanger is in boiler waste heat recovery system, the flue gas being passed through in heat exchanger can to heat the water in heat exchanger tube.
The heat exchanger includes cylinder needle recuperator main body 6, and gas inlet is axially respectively set in 6 liang of lateral edges of heat exchanger main body
1 and exhanst gas outlet 4, flue gas flow channel entrance 51, four mutual disconnected cigarettes are opened up on 6 side wall of gas inlet side heat exchanger main body
Flow channel 5 passes through inside heat exchanger main body 6, and flue gas flow channel outlet 52 is opened up on 6 side wall of exhanst gas outlet side heat exchanger main body,
Heat exchanger tube 3 is generally axially set in flue gas flow channel 5, and the space in heat exchanger main body 6, outside flue 5 forms and pours gas
All flue gas flow channel entrances 51 of body runner 2 are each fallen in gas inlet 1, and all flue gas flow channel outlets 52 each fall within exhanst gas outlet 4
In；Heat exchanger main body 6 is glass material, and heat exchanger tube 3 is carbon steel material.
Pouring gas flow 2 is solid construction, pours glass and is formed；Heat exchanger tube 3 includes axially being arranged positioned at heat exchanger
Main body 6 hit exactly a center heat exchanger tube, around six I grades of heat exchanger tubes of center heat exchanger tube and around the ten of I grades of heat exchanger tubes
Three II grades of heat exchanger tubes, the distance between each I grades of heat exchanger tube is close, and the distance between each II grades of heat exchanger tube is close, I grades of heat exchanger tubes
It is distributed with II grades of heat exchanger tubes with axial symmetry.Pouring every flue gas flow channel 5 in gas flow 2 includes five heat exchanger tubes 3, heat exchanger tube 3
For light pipe.The circular runner to be formed and surround heat exchanger tube 3 is expanded by 5 part of flue gas flow channel of heat exchanger tube 3.
When work, flue gas passes through four groups of flue gas flow channels 5 being evenly arranged, and is arranged the heat transferring medium of heat exchanger tube 3 therein
It is discharged after cooling through exhanst gas outlet 4.When flue gas passes through flue gas flow channel 5, air current composition is uniform, and flue gas access does not have the abrupt change of cross-section,
Local resistance is small, and stroke is smooth clear, and the stroke length of no dead area, every airflow channel is substantially suitable, whole flue gas resistance
Power is lower and average heat transfer coefficient is higher.
The section radius for the cylindrical body that cylinder needle recuperator main body 6 is surrounded is 0.30m, length 0.5m；
The internal diameter of heat exchanger tube 3 is 0.050m, outer diameter 0.056m, length 0.5m；
The width of flue gas flow channel entrance is 0.02m, and flue gas flow channel 5 is constant along Cheng Kuandu, surrounds the circular stream of heat exchanger tube 3
The radial width in road is 0.01m.
Flue gas flow channel entrance is passed through 120 DEG C of high-temperature flue gas, flue gas flow rate 10m/s, flue gas flow channel exit gas temperature
It is 70 DEG C, flue gas mean flow rate is 8.7m/s；40 DEG C of cold water, chilled water flow velocity 1.5m/s are passed through in heat exchanger tube.
Embodiment 1-2
The structure of heat exchanger is consistent with embodiment 1-1, and difference is only that, heat exchanger tube is screwed pipe, and the minimum diameter of pipe is
0.050m, length 0.5m, screw pitch 0.08m, screw thread groove depth 3mm.The technical parameter of other each components of heat exchanger and implementation
Example 1-1 is consistent.
Embodiment 1-3
The structure of heat exchanger is consistent with embodiment 1-1, and difference is only that, flue gas flow channel 5 is gradually reduced along Cheng Kuandu, cigarette
The width of flow channel entrance is 0.03m, and the width of flue gas flow channel outlet is 0.015m.Surround the circular runner of heat exchanger tube 3
Radial width is identical, and the radial width of circular runner is 0.01m.The technical parameter and embodiment of other each components of heat exchanger
1-1 is consistent.
Embodiment 1-4
As shown in figure 3, the structure of heat exchanger is consistent with embodiment 1-1, difference is only that, flue gas flow channel 5 along Cheng Kuandu
It is identical, width 0.02m；The radial width of circular runner for surrounding heat exchanger tube 3 is gradually reduced, circular runner it is radially-wide
Degree is followed successively by 0.01m, 0.008m, 0.008m, 0.006m, 0.005m.The technical parameter of other each components of heat exchanger and implementation
Example 1-1 is consistent.
Embodiment 1-5
The structure of heat exchanger is consistent with embodiment 1-1, and difference is only that, flue gas flow channel 5 is gradually reduced along Cheng Kuandu, cigarette
The width of flow channel entrance is 0.03m, and the width of flue gas flow channel outlet is 0.015m；Surround the circular runner of heat exchanger tube 3
Radial width is gradually reduced, and the radial width of circular runner is followed successively by 0.01m, 0.008m, 0.008m, 0.006m, 0.005m.
The technical parameter of other each components of heat exchanger is consistent with embodiment 1-1.
Embodiment 1-6
As shown in figure 4, the structure of heat exchanger is consistent with embodiment 1-1, difference is only that, the annular flow of 3 border of heat exchanger tube
Several bulge-structure I 7 towards heat exchanger tube 3 are disposed on road.Bulge-structure I 7 is for positioning and fixing heat exchange therein
Pipe.The height of protrusion is 3~5mm.
Embodiment 2-1
The structure of heat exchanger is consistent with embodiment 1-1, and difference is only that, pouring gas flow 2 is hollow structure.
Embodiment 2-2
The structure of heat exchanger is consistent with embodiment 1-2, and difference is only that, pouring gas flow 2 is hollow structure.
Embodiment 2-3
The structure of heat exchanger is consistent with embodiment 1-3, and difference is only that, pouring gas flow 2 is hollow structure.
Embodiment 2-4
The structure of heat exchanger is consistent with embodiment 1-4, and difference is only that, pouring gas flow 2 is hollow structure.
Embodiment 2-5
The structure of heat exchanger is consistent with embodiment 1-5, and difference is only that, pouring gas flow 2 is hollow structure.
Embodiment 2-6
The structure of heat exchanger is consistent with embodiment 1-6, and difference is only that, pouring gas flow 2 is hollow structure.
Comparative example
Comparative example 1
Shell-and-tube heat exchanger as shown in Figure 1, flue gas are walked and multiple baffling in heat exchanger tube.Flue gas is by tube bank
When, the continuous acute variation of flow area, flue gas flow rate mutation is obvious, and forms heat exchanger tube middle and back flue gas low velocity eddy, this
The variation of kind flue gas flow rate and low velocity eddy can not make the coefficient of heat transfer correspondingly be significantly increased, and unnecessarily consume instead
The power of flue gas, increases resistance.In addition, the outside and inside of some flue gas corners are deposited because flow of flue gas is there are inertia
In flue gas stagnant wake, these stagnant wake Heat exchangers reduce total heat exchange efficiency.
Comparative example 2
The structure of heat exchanger is consistent with embodiment 1-1, and difference is only that, flue gas flow channel is widened along Cheng Kuandu, annular channel
Width increases, such as annular channel width reaches 15mm, then the coefficient of heat transfer reduces, and heat transfer effect is deteriorated.
Combining preferred embodiment above, the present invention is described, but these embodiments are only exemplary
, only play the role of illustrative.On this basis, a variety of replacements and improvement can be carried out to the present invention, these each fall within this
In the protection scope of invention.
Claims (10)
1. a kind of heat exchanger for flue gas heat exchange, which is characterized in that the heat exchanger includes cylindrical heat exchanger main body (6), is being changed
Gas inlet (1) and exhanst gas outlet (4) is axially respectively set in hot (6) two lateral edge of device main body, in gas inlet side heat exchanger main body
(6) it is opened up on side wall flue gas flow channel entrance (51), flue gas flow channel (5) passes through heat exchanger main body (6) inside, changes in exhanst gas outlet side
Flue gas flow channel outlet (52) is opened up on hot device main body (6) side wall, and heat exchanger tube (3) are generally axially set in flue gas flow channel (5),
In the heat exchanger main body (6), the space of flue (5) outside forms and pours gas flow (2)；
Flue gas is passed through through gas inlet (1), flows through flue gas flow channel (5) through flue gas flow channel entrance (51), by heat exchanger tube (3) and/or
After pouring the heat transferring medium cooling being passed through in gas flow (2), it is discharged through flue gas flow channel outlet (52) by exhanst gas outlet (4).
2. heat exchanger according to claim 1, which is characterized in that heat exchanger main body (6) is axially symmetric structure.
3. heat exchanger according to claim 1, which is characterized in that pouring gas flow (2) can be entity structure, or
Shell structure；
When pouring gas flow (2) is shell structure, heat transferring medium, heat transferring medium can be passed through by pouring in gas flow (2)
Along axial circulation, with the flue gas heat exchange to circulate in flue gas flow channel (5).
4. heat exchanger according to claim 1, which is characterized in that all flue gas flow channel entrances (51) of flue gas flow channel (5)
It imports in gas inlet (1), all flue gas flow channel outlets (52) import in exhanst gas outlet (4)；
It is not connected between each flue gas flow channel (5), is independent gas flow.
5. heat exchanger according to claim 1, which is characterized in that the runner stroke of every flue gas flow channel (5) is close；Every
Number of heat exchange tubes in flue gas flow channel (5) is close.
6. heat exchanger according to claim 1, which is characterized in that heat exchanger tube (3) uniformly divides in heat exchanger main body (6)
Cloth；
When heat exchanger main body (6) are axially symmetric structure, heat exchanger tube (3) is in heat exchanger main body (6) along its symmetrical axial symmetry
Arrangement.
7. heat exchanger according to claim 1, which is characterized in that the width of the flue gas flow channel (5) of nearly heat exchanger tube (3) two sides
No more than the maximum radial width of heat exchanger tube (3), expands to be formed by flue gas flow channel (5) part of heat exchanger tube (3) and surround heat exchange
The annular runner of (3) is managed, flue gas shunts when passing through heat exchanger tube (3), integrally contacts with heat exchanger tube (3).
8. heat exchanger according to claim 1, which is characterized in that
Flue gas flow channel (5) is constant along Cheng Kuandu, and the section of the flue gas flow channel part of heat exchanger tube (3) periphery is with flow of flue gas direction
It is gradually reduced；Or
The section of the flue gas flow channel part of heat exchanger tube (3) periphery is identical, and flue gas flow channel (5) is along Cheng Kuandu with flow of flue gas direction
It is gradually reduced；Or
The section of the flue gas flow channel part of heat exchanger tube (3) periphery and flue gas flow channel (5) are along Cheng Kuandu as flow of flue gas direction is equal
It is gradually reduced.
9. heat exchanger according to claim 1, which is characterized in that heat exchanger tube (3) can also arrange with vertical axial direction,
And heat exchanger tube (3) path can be straight line or curve, the heat transferring medium and cigarette by heat transfer or heat radiation, in heat exchanger tube (3)
Flue gas in flow channel (5) exchanges heat.
10. a kind of heat-exchange method, which is characterized in that this method includes that flue gas is passed through equally distributed flue gas stream in heat exchanger
Heat exchanger is discharged after cooling in road；
Preferably, which is the heat exchanger for flue gas heat exchange described in one of the claims 1 to 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111964489A (en) * | 2020-08-17 | 2020-11-20 | 肖美占 | High-efficiency heat exchanger capable of improving differentiation of cross sectional areas among different heat exchange tubes |
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| CN106017154A (en) * | 2016-06-25 | 2016-10-12 | 湖州鼎诚环保科技有限公司 | Heat exchange equipment used for flue gas desulfurization |
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