CN105202618B - A kind of boiler afterheat heating method of anti-low-temperature corrosion - Google Patents
A kind of boiler afterheat heating method of anti-low-temperature corrosion Download PDFInfo
- Publication number
- CN105202618B CN105202618B CN201510684547.2A CN201510684547A CN105202618B CN 105202618 B CN105202618 B CN 105202618B CN 201510684547 A CN201510684547 A CN 201510684547A CN 105202618 B CN105202618 B CN 105202618B
- Authority
- CN
- China
- Prior art keywords
- temperature
- flue
- fin
- radiator
- blower fan
- 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.)
- Active
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
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Landscapes
- Steam Or Hot-Water Central Heating Systems (AREA)
Abstract
The invention provides a kind of boiler afterheat heating method of anti-low-temperature corrosion, methods described comprises the following steps：The first step, the exhaust gas temperature of flue gas is measured first, according to the aperture of exhaust gas temperature adjust automatically valve or the frequency of blower fan of flue gas；Second step, the inlet temperature of radiator is then measured again, determine whether to start ancillary heating equipment according to the temperature of measurement.The present invention passes through convector temperature sensor automatic measurement radiator inlet temperature, to meet radiating requirements, the exhaust gas temperature of flue gas is automatically controlled by controlling the flow for the flue gas for participating in UTILIZATION OF VESIDUAL HEAT IN heat exchange simultaneously, avoids low-temperature corrosion, realizes the intelligent regulation of system.
Description
Technical field
The invention belongs to steam boiler field, more particularly to steam boiler waste heat to utilize field.
Background technology
With China's rapid economic development, energy resource consumption increasingly increases, and also gets over the problem of urban air quality worsening
The problem of hair protrusion, the saving energy and reduction environment harmful discharge, is extremely urgent.In common steam generating process, energy consumption
High, with serious pollution one of the main reasons is that the exhaust gas temperature of boiler smoke is too high, wastes mass energy, therefore to boiler tail
Gas waste heat carries out recycling, realizes the purpose of energy-saving and emission-reduction, while can be with environmental protection.But in the prior art full
While sufficient fume afterheat, it may occur that low-temperature corrosion, therefore the problem of how to avoid low-temperature corrosion from being one important, simultaneously
If in order to which just to avoid low-temperature corrosion, waste heat wastes too much in flue gas in some cases, cause waste heat profit occurs
With effect it is bad the problem of, therefore above-mentioned relevant issues are urgently to be resolved hurrily.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of boiler afterheat heating method of anti-low-temperature corrosion.
The technical solution adopted by the present invention is as follows：A kind of boiler afterheat heating method of anti-low-temperature corrosion, methods described bag
Boiler, flue collector, bypass flue and heat exchanger are included, flue gas caused by the boiler enters heat exchanger by bypass flue entrance,
Flue gas after heat exchange is discharged after flowing into flue collector by the outlet of bypass flue；
Flue collector blower fan is set in flue collector, bypass flue blower fan is set on bypass flue；
Methods described further comprises flue temperature sensor, the temperature of the flue temperature sensor measurement discharge flue gas
Degree, methods described include central controller, and central controller enters with temperature sensor, flue collector blower fan valve and bypass flue blower fan
Row data connect, and central controller is according to the exhaust gas temperature of temperature sensor measurement come adjust automatically flue collector blower fan and bypass cigarette
The frequency of road blower fan；
The heat exchanger connects radiator, and the radiator is convector, and the flue gas in the heat exchanger is by heat
The water of radiator is passed to, heat supply is carried out using waste heat so as to realize；
Ancillary heating equipment is set on the entrance pipe of described radiator, for heating the water entered in radiator；Institute
The ancillary heating equipment stated is electric heating equipment,
Methods described includes temperature sensor, and temperature sensor is arranged on the entrance of radiator, surveyed by temperature sensor
The temperature for the water that amount enters in radiator, central controller are connected with temperature sensor and electric heating equipment data；
Methods described comprises the following steps：
The first step, measure the exhaust gas temperature of flue gas first, according to the aperture of the exhaust gas temperature adjust automatically valve of flue gas or
The frequency of person's blower fan；
Second step, the inlet temperature of radiator is then measured again, added according to the temperature of measurement to determine whether to start auxiliary
Hot equipment.
Preferably, in the first step, if the temperature of measurement is too low, central controller is by turning bypass flue wind down
The frequency of machine, while increase the frequency of flue collector blower fan；In second step, if the temperature of measurement is too high, central controller
By increasing the frequency of bypass flue blower fan, if while reduce flue collector blower fan frequency measurement temperature it is too low, center
Controller automatic start ancillary heating equipment.
Preferably, the radiator includes upper header and lower collector pipe and its circular arc between upper header and lower collector pipe
The finned tube of tee section, the finned tube include base tube and the fin positioned at matrix periphery, and the cross section of the base tube is round
Arc, the fin include the first fin and the second fin, and first fin is stretched out from the midpoint of circular arc, and described
Two fins are including the multiple fins extended outwardly where the circular arc from circular arc and stretch out from the first fin more
Individual fin, the second fin extended to same direction is parallel to each other, and the base of the circular arc, the first fin, the second fin prolong
The end stretched forms isosceles triangle；The substrate tube sets first fluid passage, and second is set inside first fin
Fluid passage, the first fluid passage connect with second fluid passage.
Preferably, second fin, relative to the face specular where the first fin center line, adjacent is described
The distance of second fin is L1, and the base length of the circular arc is W, and the length of the waist of the isosceles triangle is S, is met such as
Lower formula：
L1/S*100=A*Ln (L1/W*100)+B* (L1/W)+C, wherein Ln is logarithmic function, and A, B, C are coefficients, 0.66
<A<0.70,21<B<24,3.3<C<5.2；
0.06<L1/S<0.07,0.08<L1/W<0.10；
3mm<L1<5mm；
40mm <S<75mm；
30mm <W<50mm；
The drift angle that the line of the midpoint of circular arc and the two-end-point of circular arc is formed is a, 100 °<a<160°.
Compared with prior art, the present invention has the advantage that：
1）By convector temperature sensor automatic measurement radiator inlet temperature, to meet radiating requirements, simultaneously
The exhaust gas temperature of flue gas is automatically controlled by controlling the flow for the flue gas for participating in UTILIZATION OF VESIDUAL HEAT IN heat exchange, avoids low-temperature corrosion.
2）In the case where ensureing to avoid low-temperature corrosion, when fume afterheat utilizing status is bad, auxiliary is set to add
Hot equipment ensures to meet UTILIZATION OF VESIDUAL HEAT IN.
3）Automatic firing equipment ensures to save the energy according to UTILIZATION OF VESIDUAL HEAT IN situation adjust automatically heating power.
4) the new radiator in UTILIZATION OF VESIDUAL HEAT IN is have developed, and optimizes the dimensional structure of radiator, strengthens waste heat profit
Effect.
Brief description of the drawings
Fig. 1 is one embodiment schematic diagram of boiler waste heat utilization system of the present invention；
Fig. 2 is another embodiment schematic diagram of boiler waste heat utilization system of the present invention；
Fig. 3 is the improved schematic diagram of one embodiment of boiler waste heat utilization system of the present invention；
Fig. 4 is the improved schematic diagram of another embodiment of boiler waste heat utilization system of the present invention；
Fig. 5 is the schematic diagram of user's heat radiator fin pipe of the present invention；
Fig. 6 is the cross-sectional view of finned tube；
Fig. 7 is Fig. 6 from the schematic diagram in terms of left side；
Fig. 8 is the section schematic diagram of the fin of Fig. 6 providing holes.
Reference is as follows：
1 boiler, 2 flue collector regulating valves, 3 bypass flue regulating valves, 4 total air exhausters, 5 flue temperature sensors, 6 heat exchange
Device, 7 central controllers, 8 inlet temperature sensors, 9 radiators, 10 bypass flue blower fans, 11 main road flue blower fans, 12 main cigarettes
Road, 13 bypass flue entrances, the outlet of 14 bypass flues, 15 ancillary heating equipments, 16 bypass flues, 17 first fluid passages, 18
First fin, 19 second fins, 20 second fins, 21 first sides, 22 second sides, 23 bases, 24 holes, 25 second fluid passages,
26 base tubes.
Embodiment
The embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.
Fig. 1 illustrates a kind of station boiler afterheat utilizing system, and the system includes boiler 1, flue collector 12, bypass flue
16 and heat exchanger 6, a flue gas part caused by the boiler 1 directly excluded by flue collector, a part entered by bypass flue
Mouth 13 enters heat exchanger 6, and the flue gas after heat exchange is discharged after flowing into flue collector 12 by the outlet 14 of bypass flue.
As one preferably, the boiler waste heat utilization system adjust automatically exhaust gas temperature avoids low-temperature corrosion.Mainly
The embodiment taken is as follows：
Flue collector regulating valve 2 is set between bypass flue entrance 13 and the bypass flue outlet 14 of flue collector 12, is used for
The exhaust gas volumn of flue collector 12 is adjusted, while bypass flue regulating valve 3 is set on bypass flue 16, adjusts the cigarette of bypass flue 16
Tolerance.
The system further comprises flue temperature sensor 5, and the flue temperature sensor 5 is arranged on flue collector 12
The downstream of the outlet 14 of bypass flue, for measuring the temperature of discharge flue gas.The system includes central controller 7, center control
Device 7 processed carries out data with temperature sensor 5, flue collector regulating valve 2 and bypass flue regulating valve 3 and is connected, the basis of central controller 7
The exhaust gas temperature of temperature sensor measurement carrys out the aperture of adjust automatically flue collector regulating valve and bypass flue regulating valve, low to avoid
Temperature corrosion.
If the exhaust gas temperature of measurement is too low, central controller 7 is by tuning up the aperture of flue collector regulating valve 2, simultaneously
Reduce the aperture of bypass flue regulating valve 4.By so reducing the flue gas flow into by-pass flue, the cigarette because excessive is avoided
Gas is exchanged heat and causes exhaust gas temperature too low, so as to avoid low-temperature corrosion.If the exhaust gas temperature of measurement is too high, center control
Device 7 processed increases the aperture of bypass flue regulating valve 4 by reducing the aperture of flue collector regulating valve 2.By so increase into
Enter the flue gas flow of by-pass flue, avoid, because excessive flue gas flows into flue collector, causing the loss of UTILIZATION OF VESIDUAL HEAT IN.
Certainly, as a preferred embodiment, flue collector regulating valve and bypass flue regulating valve can be not provided with, is such as schemed
Shown in 2, the bypass flue blower fan 10 being connected with the data of central controller 7 is set on bypass flue, sets and leads in flue collector 12
Flue blower fan 11, blower fan 10 and 11 are connected with the data of central controller 7 respectively, and central controller 7 is by adjusting bypass flue wind
The frequency of machine 10 and flue collector blower fan 12 adjusts the exhaust gas volumn into flue collector 12 and bypass flue 16.If the temperature of measurement
Too low, then central controller 7 is by turning the frequency of bypass flue blower fan 10 down, while increases the frequency of flue collector blower fan 12, from
And increase the exhaust gas volumn into flue collector, the flue gas flow into by-pass flue is reduced, is avoided because excessive flue gas is changed
Heat and cause exhaust gas temperature too low, so as to avoid low-temperature corrosion., whereas if the temperature of measurement is too high, then central controller 7 is logical
The frequency of increase bypass flue blower fan 10 is crossed, while reduces the frequency of flue collector blower fan, so as to reduce the flue gas into flue collector
Amount, increase avoid, because excessive flue gas flows into flue collector, causing the damage of UTILIZATION OF VESIDUAL HEAT IN into the flue gas flow of by-pass flue
Lose.
Preferably, the heat exchanger 6 connects radiator 9, the radiator 9 is convector.In the heat exchanger 6
Flue gas transfer heat to the water of radiator 9, utilize waste heat to carry out heat supply so as to realize.
Preferably, in the entrance inlet porting temperature sensor 8 of radiator 9, entered by the measurement of temperature sensor 8 and dissipated
The temperature of water in hot device 9.
The inventive point of the present invention is by controlling the flow into bypass flue flue gas, so as to control into radiating
The temperature of the reclaimed water of device 9, avoids water temperature over-high or too low.
For the improvement of Fig. 1 embodiment, as one preferably, if temperature sensor 8 measure into radiator 9
The temperature of water is too low, then central controller 7 is by reducing the aperture of flue collector regulating valve 2, while increases bypass flue regulating valve 4
Aperture.By so increasing the flue gas flow into by-pass flue, so as to increase heat exchange amount to improve into radiator
The temperature of water.
If the temperature of the water into radiator of measurement is too high, central controller 7 is by increasing flue collector regulating valve 2
Aperture, while reduce the aperture of bypass flue regulating valve 4.By so reducing the flue gas flow into by-pass flue, so as to
The temperature for the water for reducing heat exchange amount to be lowered into radiator.
For the improvement of Fig. 2 embodiment, as one preferably, if temperature sensor 8 measure into radiator 9
The temperature of water is too low, then central controller 7 is by reducing the frequency of flue collector blower fan 11, while increases bypass flue blower fan 10
Frequency.By so increasing the flue gas flow into by-pass flue, the exhaust gas volumn of flue collector is lowered into, so as to increase heat exchange amount
To improve the temperature into the water in radiator.
If the temperature of the water into radiator of measurement is too high, central controller 7 is by increasing flue collector blower fan 11
Frequency, while reduce the frequency of bypass flue blower fan 10.By so reducing the flue gas flow into by-pass flue, so as to subtract
The temperature for the water for lacking heat exchange amount to be lowered into radiator.
Certainly, as a preferred embodiment, flue collector regulating valve and bypass flue regulating valve can be not provided with, is such as schemed
Shown in 2, the bypass flue blower fan 10 being connected with the data of central controller 7 is only set on bypass flue, is not provided with flue collector wind
Machine 11.The exhaust gas volumn into bypass flue 16 is adjusted by changing the frequency of bypass flue blower fan 10.If the entrance of measurement
The temperature of radiator is too low, then central controller 7 is increased into by-pass flue by increasing the frequency of bypass flue blower fan 10
Flue gas flow, so as to increase heat exchange amount to improve the temperature into the water in radiator.
If the temperature into radiator of measurement is too high, central controller 7 is by reducing bypass flue blower fan 10
Frequency, which is reduced, adds flue gas flow into by-pass flue, so as to reduce heat exchange amount the temperature of water that is lowered into radiator.
Certainly, as a preferred embodiment, as shown in Figure 3,4, set on the entrance pipe of described radiator 9 auxiliary
Firing equipment 15 is helped, for heating the water entered in radiator.By increasing ancillary heating equipment, a purpose is to ensure
The temperature of radiator reclaimed water reaches heating temperature.
Preferably, described ancillary heating equipment is electric heating equipment 15, pass through the change of the power of electric heating equipment 15
Change and to provide different heats to the water entered in radiator 9.
If the temperature of the water into radiator 9 of temperature sensor measurement is too low, the automatic start of central controller 7 electricity
Firing equipment.
Preferably, central controller 7 adjusts heating power according to the inlet temperature into radiator of measurement.Work as survey
When the inflow temperature of amount is less than temperature a, electric heating equipment starts heating, and is heated with power A；Enter water temperature when thermal measurement
When degree is less than the temperature b lower than temperature a, electric heating equipment is heated with the power B higher than power A；Enter water temperature when measurement
When degree is less than the temperature c lower than temperature b, electric heating equipment is heated with the power C higher than power B；Enter water temperature when measurement
When degree is less than the temperature d lower than temperature c, electric heating equipment is heated with the power D higher than power C；Enter water temperature when measurement
When degree is less than the temperature e lower than temperature d, electric heating equipment is heated with the power E higher than power D.
Of course, it is possible to selection, in order to increase the accuracy of measurement temperature, can set in the water outlet of radiator 9
Another temperature sensor is put, opening for electric heating equipment is calculated by the average value of the temperature of the measurement of two temperature sensors
Dynamic power.
Another purpose by increasing ancillary heating equipment is to prevent from occurring low-temperature corrosion during heating.It is main
Reason is wanted to be if the temperature into the water of radiator 9 is too low, by increasing the aperture of bypath valve or the frequency of blower fan,
It is excessive to may result in the flue gas quantity for participating in exchanging heat, causes generation exhaust gas temperature too low, so as to which low-temperature corrosion occur.And pass through
Increase ancillary heating equipment, low-temperature corrosion can be avoided well, while needs of warming oneself can also be met.
As preferred embodiment, if the temperature of the water into radiator of measurement is too low, central controller 7 passes through
Reduce the aperture of flue collector regulating valve 2, while increase the aperture of bypass flue regulating valve 4, the exhaust gas volumn participated in increase.This
When, if the temperature of the smoke evacuation measurement of measurement reaches the critical-temperature of low-temperature corrosion, now the aperture of bypass flue regulating valve 4 is not
It is further added by；If the temperature of the water into radiator 9 now measured is still too low, central controller controls electric heating equipment
Automatic start.
As a preferred embodiment, meets the needs of heating by improving the embodiment in Fig. 2.It is other by changing
The frequency of road flue blower fan 10 adjusts the exhaust gas volumn into bypass flue 16.If the temperature mistake into radiator of measurement
Low, then central controller 7 is by increasing the frequency of bypass flue blower fan 10, increase into by-pass flue flue gas flow, so as to
Increase heat exchange amount to improve the temperature into the water in radiator.Now, if the temperature of the smoke evacuation measurement of measurement reaches low temperature
The critical-temperature of corrosion, now the frequency of bypass flue blower fan be not further added by；If the water into radiator now measured
Temperature is still too low, then central controller controls electric heating equipment automatic start.
It can avoid unilaterally meeting heat demand by such equipment to cause exhaust gas temperature low-temperature corrosion occur.
Preferably, ancillary heating equipment 15 is arranged on the upstream of temperature sensor 8.
Certainly, for system above, present invention also offers a kind of method, this method can avoid low-temperature corrosion, together
When can also meet heat needs.
This method comprises the following steps：
The first step, measure the exhaust gas temperature of flue gas first, according to the aperture of the exhaust gas temperature adjust automatically valve of flue gas or
The frequency of person's blower fan.
If the temperature of measurement is too low, for Fig. 1 embodiment, then central controller 7 is by tuning up flue collector regulation
The aperture of valve 2, while reduce the aperture of bypass flue regulating valve 4.For Fig. 2 embodiment, then central controller 7 is by turning down
The frequency of bypass flue blower fan 10, while increase the frequency of flue collector blower fan.Reduced by above-mentioned measure into by-pass flue
Flue gas flow, avoid because excessive flue gas is exchanged heat and causes exhaust gas temperature too low.
If the temperature of measurement is too high, for Fig. 1 embodiment, then central controller 7 is by reducing big flue collector tune
The aperture of valve 2 is saved, while increases the aperture of bypass flue regulating valve 4.For Fig. 2 embodiment, then central controller 7 passes through increasing
Add the frequency of bypass flue blower fan 10, while reduce the frequency of flue collector blower fan.
Low-temperature corrosion is mainly prevented by first step.
Second step, the inlet temperature of radiator is then measured again, added according to the temperature of measurement to determine whether to start auxiliary
Hot equipment.
If the temperature of measurement is too low, central controller automatic start ancillary heating equipment.
The needs of heating are met mainly while low-temperature corrosion is prevented by second step.
The radiator includes upper header and lower collector pipe and its finned tube between upper lower collector pipe, the finned tube bag
Base tube 26 and the fin 18-20 positioned at base tube periphery are included, as shown in Figure 5,6, the cross section of the base tube is circular arc, described
It is from the midpoint of the circular arc of circular arc to extension that fin, which includes the first fin 18 and the second fin 19,20, first fin 18,
Stretch, second fin 19,20 include from the multiple fins 19 extended outwardly where two sides of circular arc and from
Multiple fins 20 that first fin stretches out, the second fin 19,20 extended to same direction is parallel to each other, for example, such as Fig. 2
It is shown, from the second side of circular arc 22（The side on the left side）The second fin 19,20 to stretch out is parallel to each other, from isosceles triangle
On one side 21（That is the side on the right）The second fin 19,20 to stretch out is parallel to each other, first fin 18, the second fin 19,
The end of 20 extensions forms isosceles triangle, as shown in Fig. 2 the length of the waist of isosceles triangle is S；Set inside the base tube 26
Put first fluid passage 17, the inside of the first fin 18 sets second fluid passage 25, the first fluid passage 18 and the
Two fluid passages connection 25.For example, as described in Figure 5, connected in the position at the midpoint of circular arc.
By structure setting so, it can cause the outside of base tube 26 that multiple fins are set, increase is radiated, while first
Fluid passage is set inside fin so that fluid enters in the first fin, and the second fin being directly connected with the first fin enters
Row heat exchange, adds heat-sinking capability.
The fluid of the first fluid passage and second fluid passage is preferably water.
General finned tube is all that surrounding or both sides set fin, but is found in engineering, the side contacted with wall
Fin generally heat convection effect is bad because air flowed in wall side it is relatively poor, therefore the present invention will
Circular arc base 23 is arranged to plane, therefore when install fin, directly can be in close contact plane and wall, and other
Radiator is compared, and can greatly save installing space, avoids the waste in space, while takes special fin configuration, is ensured
Meet optimal radiating effect.
Preferably, second fin 19,20 is relative to the face specular where the center line of the first fin 18, i.e., it is relative
In the face specular where the line at the midpoint where the midpoint of circular arc and base, the midpoint relative to circular arc and circle in other words
Face specular where the line in the center of circle where arc.
Preferably, the second fin extends perpendicular to two waists of isosceles triangle.
In the case that the angle a of the line of the midpoint of circular arc and the end points of arc formation and the length of arc are certain, the
One fin 18 and the second fin 19,20 are longer, then heat transfer effect is better in theory, is found during experiment, when the first fin
When reaching certain length with the second fin, then heat transfer effect just increases very unobvious, is primarily due to the first fin
It is also more and more lower in the temperature of flight tip with the increase of the second finned length, as temperature reduces to a certain extent, then can cause
Heat transfer effect unobvious, it conversely also add the cost of material and considerably increase the space occupied of radiator, meanwhile, change
In thermal process, if the spacing between the second fin is too small, the deterioration of heat transfer effect is also easily caused, because with fin pipe range
The increase of degree, boundary layer is thickening in air uphill process, and boundary layer mutually coincides between causing adjacent fins, deteriorates heat transfer, wing
Piece length of tube is too low or the second fin between spacing cause heat exchange area to reduce greatly very much, have impact on the transmission of heat, therefore
Grown in the length and heat sink of the distance of the second adjacent fin, the length of side of circular arc, the first fin and the second fin
Meet the size relationship of an optimization between degree.
Therefore, the present invention optimal is dissipated by what thousands of secondary test datas of multiple various sizes of radiators summed up
The dimensionally-optimised relation of hot device.
The distance of adjacent the second described fin is L1, and the base length of the circular arc is W, the isosceles triangle
The length of waist be S, meet equation below：
L1/S*100=A*Ln (L1/W*100)+B* (L1/W)+C, wherein Ln is logarithmic function, and A, B, C are coefficients, 0.66
<A<0.70,21<B<24,3.3<C<5.2；
0.06<L1/S<0.07,0.08<L1/W<0.10；
3mm<L1<5mm；
40mm <S<75mm；
30mm <W<50mm；
The drift angle that the line of the midpoint of circular arc and the two-end-point of circular arc is formed is a, 100 °<a<160°.
Preferably, base tube length is L, 0.02<W/L<0.04,800mm<L<2500mm.
Preferably, A=0.68, B=22.6, C=4.3.
It should be noted that the distance L1 of adjacent second fin is the distance counted since the center of the second fin, such as
As shown in Fig. 5.
By being tested again after result of calculation, by calculating the numerical value on border and median, the result of gained is basic
Upper to be matched with formula, for error substantially within 3.44%, maximum relative error is no more than 3.78%, and mean error is
2.32%。
Preferably, the distance of described the second adjacent fin is identical.
Preferably, the width of the first fin is greater than the width of the second fin.
Preferably, the width of the first fin is b1, and the width of the second fin is b2, wherein 2.2*b2<b1<3.1*b2;
Preferably, 0.9mm<b2<1mm,2.0mm<b1<3.2mm.
Preferably, the width of second fluid passage is 0.85-0.95 times of the width of the second fin, preferably 0.90-
0.92 times.
Width b1, b2 herein refers to the mean breadth of fin.
The fin width for taking above-mentioned optimization, channel width and other effects is found through experiments that, can reach optimal and change
Thermal effect.
Preferably, for the distance between second fin it is changed according to certain rule, specific rule is from circle
The end points of arc is less and less to the distance between the midpoint of circular arc, the second fin 19 extended from two sides 21,22 of circular arc, from
The midpoint of circular arc to the end of the first fin 18, it is increasing from the distance between the second fin 20 of the first fin 18 extension.
Main cause is the second fin set on circular arc, and heat dissipation capacity gradually increases from circular arc end points to arcuate midway point, it is therefore desirable to
Increase the quantity of fin, therefore increase the quantity of fin by reducing the spacing of fin.Similarly, along the first fin 18, from
End is arrived in the middle part of circular arc, the quantity of radiating is fewer and fewer, therefore the corresponding quantity for reducing fin., can be with by being arranged such
Radiating efficiency is greatly improved, while greatly saves material.
Preferably, from the end points of circular arc to the midpoint of circular arc, between the second fin 19 extended from two sides of circular arc
Distance reduction amplitude it is less and less, from the midpoint of circular arc to the end of the first fin 18, from the of the extension of the first fin 18
The distance between two fins 20 increased amplitude is increasing.It is found through experiments that, by above-mentioned setting, with increasing or reducing
Amplitude is identical to be compared, it is possible to increase about 15% radiating effect.Therefore there is good radiating effect.
Preferably, although the width or distance of the second fin change, it is preferred that still conforming to above-mentioned
The regulation of optimum formula.
Preferably, as shown in figure 8, on the first and/or second fin providing holes 24, for destroying laminar sublayer.Mainly
Reason is that the second fin is mainly exchanged heat by the convection current of air, bottom up carry out free convection of the air from the second fin
Flowing, during air flows upwards, the thickness in boundary layer constantly becomes big, or even finally results in adjacent second fin
Between boundary layer overlapped, such a situation can cause heat exchange deterioration.Therefore border can be destroyed by providing holes 24
Layer, so as to augmentation of heat transfer.
Preferably, the shape in hole 24 is semicircle or circular.
Preferably, hole 24 penetrates the thickness of whole fin, as shown in Figure 8.
As one preferably, along the direction of the flowing of air, i.e., from the bottom of fin to the top of radiator, hole 9
Density（That is quantity）Constantly increase.Main cause is constantly increased along the direction of the flowing of air, the thickness in boundary layer,
Therefore by setting the density in ever-increasing hole 9, can constantly to increase the destructiveness in boundary layer, so as to strengthen
Heat transfer.
Preferably, the most close local density in hole 9 is 1.26-1.34 times of most thin local density, preferably 1.28
Times.
Although the present invention is disclosed as above with preferred embodiment, the present invention is not limited to this.Any art technology
Personnel, without departing from the spirit and scope of the present invention, it can make various changes or modifications, therefore protection scope of the present invention should
It is defined when by claim limited range.
Claims (2)
1. a kind of boiler afterheat heating method of anti-low-temperature corrosion, methods described includes boiler, flue collector, bypass flue and heat exchange
Device, flue gas caused by the boiler enter heat exchanger by bypass flue entrance, flue gas the going out by bypass flue after heat exchange
Discharged after mouth inflow flue collector；
Flue collector blower fan is set in flue collector, bypass flue blower fan is set on bypass flue；
Methods described further comprises flue temperature sensor, the temperature of the flue temperature sensor measurement discharge flue gas, institute
Stating method includes central controller, and central controller enters line number with temperature sensor, flue collector blower fan valve and bypass flue blower fan
According to connection, central controller is according to the exhaust gas temperature of temperature sensor measurement come adjust automatically flue collector blower fan and bypass flue wind
The frequency of machine；
The heat exchanger connects radiator, and the radiator is convector, and the flue gas in the heat exchanger is by heat transfer
To the water of radiator, heat supply is carried out using waste heat so as to realize；
The radiator includes upper header and the fin of lower collector pipe and its circular section between upper header and lower collector pipe
Pipe, the finned tube include base tube and the fin positioned at base tube periphery, and the cross section of the base tube is circular arc, the fin
Including the first fin and the second fin, first fin is stretched out from the midpoint of circular arc, second fin include from
The multiple fins extended outwardly and the multiple fins to stretch out from the first fin where the circular arc of base tube cross section, to
Second fin of same direction extension is parallel to each other, the base straight line relative with circular arc in base tube shape of cross section, the first fin,
The end of second fin extension forms isosceles triangle；The substrate tube sets first fluid passage, in first fin
Portion sets second fluid passage, and the first fluid passage connects with second fluid passage；From the end points of circular arc into circular arc
The distance between point, the second fin extended from two sides of circular arc is less and less, from the midpoint of circular arc to the end of the first fin
Portion, it is increasing from the distance between the second fin of the first fin extension；
Ancillary heating equipment is set on the entrance pipe of described radiator, for heating the water entered in radiator；Described
Ancillary heating equipment is electric heating equipment,
Methods described includes temperature sensor, and temperature sensor is arranged on the entrance of radiator, entered by temperature sensor measurement
Enter the temperature of the water in radiator, central controller is connected with temperature sensor and electric heating equipment data；
Methods described comprises the following steps：
The first step, the exhaust gas temperature of flue gas is measured first, according to the aperture or wind of the exhaust gas temperature adjust automatically valve of flue gas
The frequency of machine；
Second step, the inlet temperature of radiator is then measured again, set according to the temperature of measurement to determine whether to start auxiliary heating
It is standby.
2. boiler afterheat heating method as claimed in claim 1, in the first step, if the temperature of measurement is too low, center
Controller increases the frequency of flue collector blower fan by turning the frequency of bypass flue blower fan down；In second step, if measurement
Temperature it is too high, then central controller is by increasing the frequency of bypass flue blower fan, while reduces the frequency of flue collector blower fan such as
The temperature of fruit measurement is too low, then central controller automatic start ancillary heating equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510684547.2A CN105202618B (en) | 2015-10-22 | 2015-10-22 | A kind of boiler afterheat heating method of anti-low-temperature corrosion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510684547.2A CN105202618B (en) | 2015-10-22 | 2015-10-22 | A kind of boiler afterheat heating method of anti-low-temperature corrosion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105202618A CN105202618A (en) | 2015-12-30 |
| CN105202618B true CN105202618B (en) | 2018-04-10 |
Family
ID=54950440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510684547.2A Active CN105202618B (en) | 2015-10-22 | 2015-10-22 | A kind of boiler afterheat heating method of anti-low-temperature corrosion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105202618B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112432536A (en) * | 2020-11-30 | 2021-03-02 | 奇瑞汽车股份有限公司 | Comprehensive utilization system for waste gas and waste heat of drying furnace in automobile coating workshop and working method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103900389A (en) * | 2014-04-14 | 2014-07-02 | 山东理工大学 | Intelligent-control efficient kiln waste heat utilization system |
| CN104713388A (en) * | 2014-04-14 | 2015-06-17 | 中北大学 | Combined heat and power generation system with regulating valves adapting to changes |
| CN104791875A (en) * | 2014-04-14 | 2015-07-22 | 中北大学 | Combined heat and power generation system calculating heat losses |
-
2015
- 2015-10-22 CN CN201510684547.2A patent/CN105202618B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103900389A (en) * | 2014-04-14 | 2014-07-02 | 山东理工大学 | Intelligent-control efficient kiln waste heat utilization system |
| CN104713388A (en) * | 2014-04-14 | 2015-06-17 | 中北大学 | Combined heat and power generation system with regulating valves adapting to changes |
| CN104791875A (en) * | 2014-04-14 | 2015-07-22 | 中北大学 | Combined heat and power generation system calculating heat losses |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105202618A (en) | 2015-12-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105202517B (en) | A kind of station boiler afterheat utilizing system of blower fan frequency intelligent control | |
| CN105202775B (en) | Accumulated-heat-insisted heating solar system capable of being monitored remotely and intelligently | |
| CN105157256B (en) | Solar energy system for remotely and intelligently controlling flow distribution | |
| CN110657411B (en) | Heat pipe type solar heat collector with variable pipe diameter in flow direction | |
| CN107270272A (en) | According to blowdown flow rate and the steam generator system of carrying capacity automatic pollution discharge | |
| CN206207745U (en) | Plate-fin stainless steel heat exchanger | |
| CN107367078A (en) | A kind of solar heat-preservation system using bypass conduit intelligent control | |
| CN104713388B (en) | Combined heat and power generation system with regulating valves adapting to changes | |
| CN105202618B (en) | A kind of boiler afterheat heating method of anti-low-temperature corrosion | |
| CN205262239U (en) | Water -cooled flue gas condenser in two return circuits | |
| CN203869339U (en) | Solar air collector | |
| CN109915906B (en) | Intelligent control solar heat collector system according to temperature of bypass pipe | |
| CN105387505B (en) | A kind of boiler heating system | |
| CN105202518B (en) | A kind of station boiler bootstrap system | |
| CN105202617B (en) | A kind of station boiler bootstrap system of setting ancillary heating equipment | |
| CN105444440B (en) | A kind of method that multi parameter intallingent controls solar energy system water temperature | |
| CN210951503U (en) | Low-temperature heating radiator | |
| CN104713149B (en) | The co-generation unit that a kind of heat calculates automatically | |
| CN109506375B (en) | Slot type solar heat collector | |
| CN102679550A (en) | Bypass flow horizontally-arranged gap-type condensation heat exchanger | |
| CN105258534B (en) | Cooler | |
| Bury et al. | Numerical and experimental analysis of a tube-and-fin cross-flow heat exchanger with a controlled non-uniform inflow of gas | |
| CN105066724B (en) | A kind of square equipment manufacture of cement waste heat recovery system of grate cooler | |
| CN105509347B (en) | A kind of intelligent control method of solar energy system | |
| CN109915907A (en) | A kind of intelligent control solar thermal collector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200806 Address after: 030008, No. 10, C zone, 73 Stainless Steel Industrial Park, North Steel Road, Taiyuan, Shanxi Co-patentee after: NORTH University OF CHINA Patentee after: TAIYUAN BOILER GROUP Co.,Ltd. Address before: 030051 No. 3, Xueyuan Road, Shanxi, Taiyuan Patentee before: NORTH University OF CHINA |