CN100562703C

CN100562703C - Heat exchanger and the boiler that comprises this heat exchanger

Info

Publication number: CN100562703C
Application number: CNB2005800114798A
Authority: CN
Inventors: 托马斯帕拉普·波泽森; 奥拉夫·克努森
Original assignee: Aalborg Industries AS
Current assignee: Alfa Laval Aalborg AS
Priority date: 2004-04-01
Filing date: 2005-03-30
Publication date: 2009-11-25
Anticipated expiration: 2025-03-30
Also published as: DK1735577T3; WO2005095879A1; KR20080036129A; EP1735577A1; EP1735577B1; KR100918551B1; KR100918552B1; CN1989387A; KR20070000968A

Abstract

The present invention relates to a kind of heat exchanger that is used for heat-shift between first medium and second medium, it comprises: a housing, this housing has a compartment that surrounds a plurality of substantially parallel pipelines (24), this compartment comprises import and outlet, is arranged so that so first medium is forced to flow with the flow direction (R) that is arranged essentially parallel to pipeline to outlet from import; A plurality of elongate surface enlargement part (28), be used to improve heat exchange, each has first end that is fixed on one of them pipeline, and with respect to flowing to and substantially laterally extend to second free end, second free end is positioned at the upstream of described first end with respect to the flow direction, this heat exchanger comprises that further at least one sound that is installed in the perforation between the pipeline suppresses plate (52), thereby makes compartment be subdivided into two or more sub-compartment.

Description

Heat exchanger and the boiler that comprises this heat exchanger

Technical field

The present invention relates to heat exchanger, especially relate to the heat exchanger of use in boiler and exhaust boiler.

Background technology

Have realized that at the run duration of the duct type boiler of band pin, can produce undesirable and unacceptable high noise levels in some cases.Have use and in boiler, be described in the pipeline patent disclosure formerly such as the surperficial enlarged elements of pin, US5 for example, 626,187, WO03/005467A1, WO03/033969A1, WO90/02916A1, all these openly are incorporated in this specification as a reference at this.

The present invention relates to have the boiler of convection cell, this convection cell comprises a plurality of pipelines that are used for heat exchange, specifically, relates to the boiler that comprises pipeline, and this pipeline is equipped with the surperficial enlarged elements that is used to improve heat exchange, such as a plurality of pins.

Such some boiler has been proved to be and can have produced unacceptable high noise levels, and needs to suppress or eliminate the existence of this noise.These noises have been determined by the single-frequency tone of scope within 300-700Hz to be formed.The noise that causes this tone to produce is produced making a thorough investigation of mechanism analyze, and have realized that this tone originates from the convection cell of boiler.

Resolution policy is divided into four kinds.First and the simplest method be after noise source, to reduce noise, for example by the duct attenuation device is installed in the exhaust of boiler.

Another strategy is to hinder or interrupt backflow mechanism.Cold test results shows, if backflow mechanism is hindered or prevents, can realize reducing up to 60 decibels.

Second strategy is to introduce damping in convection cell, reach certain level to prevent acoustic response, and acoustic response begins to influence significantly the unsteady flow structure as sources of noise under this level, and therefore can stop backflow.

The 3rd strategy is to introduce separating plate, with the frequency shifts that will tend to backflow model outside the scope of stimulating frequency.

The 4th strategy is to improve pin, and with exciting that abundant minimizing is not coupled, making refluxes never occurs, and perhaps interrupts interactive mechanism, and this interactive mechanism can cause that energy is from the average flow to the TRANSFER BY PULSATING FLOW and the conversion of sound field.

These conventional strategies are not mutually exclusive, and final settling mode may comprise all four strategies.

Sound or Noise Suppression Device are described in the patent disclosure such as EP0876539, are attached in this specification as a reference in this disclosure.

Summary of the invention

Above-mentioned requirements and many purposes, advantage and feature will be according to instructions of the present invention, heat exchanger by exchanged heat between first medium and second medium is obtained, these many purposes wherein, advantage and feature will become obviously from detailed description below the current and preferred embodiment of the heat exchanger that is used for exchanged heat between first and second media of the present invention, and this heat exchanger comprises:

A housing, this housing have a compartment that surrounds a plurality of substantially parallel pipelines, and this compartment comprises import and outlet, and they are arranged so that so first medium is forced to flow with the flow direction that is arranged essentially parallel to pipeline to outlet from import;

A plurality of elongated surperficial enlargement part are used to improve heat exchange, and each has first end that is fixed on one of them pipeline, and with respect to flowing to and substantially laterally extend to second free end.

These pipelines to be being arranged in the heat exchanger such as the many geometries that are arranged side by side, thereby have formed total geometry of similar square or rectangle, and preferably these pipe configuration are honey comb structure.

This surface enlargement part is formed by a thin slice, and this thin slice comprises that a base portion and one comprise a plurality of parts with free-ended parts.Selectable, this surface enlargement part can form respectively, and for example, this surface enlargement part can be shaped in independent process and be fixed to subsequently on this pipeline.Perhaps, this surface enlargement part can form with pipeline is whole.

In currently preferred embodiment of the present invention, second free end is positioned at the upstream of first end with respect to the flow direction.Surperficial enlargement part known in the prior art is directed, thereby make the free end of surperficial enlargement part be positioned at the downstream of first end, and condensed water gather that go up on the surface and the problem of the junction point of surperficial enlargement part and pipeline is noted subsequently with respect to the flow direction.Before, this surface enlargement part is because the such orientation of supposition will produce minimum pressure drop by such orientation, obtain maximum or approaching maximum heat transfer simultaneously, enlargement part such orientation in surface has strengthened noise level when still having been found that unexpectedly, and pressure drop is still the same.

In current preferred embodiment of the present invention, heat exchanger comprises that further at least one sound that is installed in the bending between at least two pipelines suppresses plate, thereby make compartment be subdivided into two or more sub-compartments, the cross section pattern of this a little compartment has the bigger frequency of the highest stimulating frequency than observed Peak Flow Rate in boiler, when 300 ℃ of the temperature at boiler top, the maximum length of sub-compartment is no more than about 30cm.The unexpected noise of finding that this plate can be decayed and be produced in boiler, and can not cause the pressure drop that adds.Setting has the pipeline of surperficial enlargement part, and described pipeline is set to cellular structure, thereby makes it possible to realize that the pipeline number of unit are is the highest, thereby makes the spacing between the surperficial enlargement part reach minimum.This plate can comprise the material that polylith is assembled into single structure.Selectively, this plate is single piece of material and can be bent or formalizes, thereby makes this plate be installed in closely in the space between the pipeline, for example between surperficial enlargement part.

In current preferred embodiment of the present invention, surperficial enlargement part is essentially pipeline shape.The surface enlargement part is preferably pipeline shape, promptly sells shape.The cross section of this surface enlargement part can adopt other shape, and is for example trapezoidal, rectangle, oval or any combination of these shapes and/or their variation.

The surface enlargement part can define a distance between first and second ends be 10 to the length of 60mm, for example 20 to 55mm, for example 40 to 50mm, for example 41 to 50mm, and preferred 43mm.The length of this surface enlargement part can be the same with all surperficial enlargement part, and perhaps length can be different, and for example these surperficial enlargement part can have two different length.Selectively, the length of these surperficial enlargement part can increase or reduce along pipeline.Further selectively, the length of these surperficial enlargement part can be at random or quasi-random select.Also further selectively, the function that the length of these surperficial enlargement part can be used as the distance of point specific on pipeline changes, for example from first surperficial enlargement part.

Preferably surperficial enlargement part is formed from steel, and for example stainless steel is made, and perhaps selectively is made of either aluminum or copper.These surperficial enlargement part are preferably made by the material with high temperature fusing point and high-termal conductivity.

Selectively, surperficial enlargement part can be defined as curve.The surface enlargement part may be defined as differentiable curve, and is perhaps selectable, comprises the curve of bending or interruption, and these surperficial enlargement part further selectively comprise a plurality of bendings or interruption.

Sound suppresses plate and comprises the hole of a plurality of sizes in 0.01mm arrives the 2mm scope, for example 0.5 arrives 1.5mm, for example 0.75 arrives 1.25mm, preferably is substantially equal to 1mm.The hole that this sound suppresses plate can be of different sizes, and perhaps all holes have substantially the same size.This plate is crossed in the layout in hole or distribution basically uniformly, and perhaps the hole can be arranged on a plurality of specific zones.

The hole can be oval basically, circular, rectangle or their any combination.Preferred these holes all are essentially oval.Selectively, first group of hole can have a geometry, and second group of hole can have another geometry, and further selectively, every group that organizes in the hole can have a particular geometric shapes more, thereby can be in conjunction with above-mentioned all geometries.

Preferably sound suppress plate can be by steel, aluminium is made, and is perhaps selectablely made by ceramic material.Preferably sound inhibition plate also can be made by stainless steel or galvanized steel.

Sound suppress plate thickness can for 0.5 08mm to 5.08mm, for example 1.016mm, for example 2.032mm, for example 3.048mm, preferably 1mm.

In current preferred embodiment of the present invention, first medium is flue gas or air, and second medium mainly is water and/or steam.First medium is preferably placed between the pipeline, and carries heat in heat exchanger from equipment such as stove.But, utilize the additional embodiments of other fluid to be conceived to.Heat is absorbed into second medium from first medium by surperficial enlargement part, and second medium relies on ducted pressure when being water, and water finally can arrive the point that a water can be evaporated to steam.

According to instruction of the present invention, boiler in particular for being installed in the boiler in the seagoing vessel, can comprise the heat exchanger with above-mentioned any aspect.According to instruction of the present invention, boiler can be installed in the seagoing vessel, cargo ship (freighter) for example, freighter, cargo ship, general ship, oil carrier or the like.

Description of drawings

Hereinafter, the present invention will be described in detail referring to accompanying drawing, wherein:

Fig. 1 is the viewgraph of cross-section that comprises the signal of the boiler of heat exchanger according to the present invention;

Fig. 2 is the vertical sectional view of the signal of Fig. 1 boiler;

Fig. 3 is the part view from top to bottom of cross section of signal of the convection cell of Fig. 1 boiler; With

Fig. 4 is the lifting view of the signal of Fig. 3 segment.

The specific embodiment

Fig. 1 is the horizontal cross sectional side view that comprises the boiler of heat exchanger according to the present invention, and the integral body of boiler is marked as Reference numeral 10.Boiler 10 comprises the burner outlet 12 that is installed in boiler 10 tops.Burner outlet 12 is communicated with furnace chamber 14 fluids that are positioned at boiler 10 inside.Combustor exit 12 discharges flame 16 among furnace chamber 14.Hot gas is by means of the opening in the sidewall 20 18 furnace chamber 14 of escaping out.Hot flue gases passes through from the bottom of convection cell 22 along a plurality of pipelines 24.Pipeline 24 is equipped with a plurality of pins with at least two different lengths.In currently preferred embodiment of the present invention, the bottom of pipeline 24 is equipped with the pin that 15 rows have 34mm length.These short pins are assembled to and are used for receiving the flue gas that directly comes from furnace chamber 14 on the pipeline, and it is cooled to about 150 ℃.Have strong market potential to pipeline assembling in this section and can cause these fusings of having strong market potential.In the upper section of this part that comprises short pin 26, can comprise that at least one comprises the part of having strong market potential.In currently preferred embodiment, having strong market potential has the length of about 43mm.

These all pins can be welded on the pipeline by resistance welding method, for example upset butt welding, resistance flash welding, resistance percussion welding, electric-resistance seam-welding, resistance spot welding, selectable other solder technology arbitrarily, the further selectable combination that comprises them.These pins can form with pipeline 24 integral body during the formation of pipeline or pipe section.In currently preferred embodiment of the present invention, pin on pipeline 24 is drawn or is pushed away by a matrix, this matrix has the little cross section of cross section than the pipeline 24 that is equipped with a plurality of pins, thereby the surface of the relative duct size 24 that causes having strong market potential is bent to an angle.Preferably, weak point pin 26 is not crooked, but the less also flexible embodiment of pin is predictable.Because the physical phenomenon of tension force and other, have strong market potential by from the about 5mm of the surface curvature of pipeline 24.If pin is from pipeline 24 crooked different distances, these pins can be weakened at ad-hoc location.

In current preferred embodiment of the present invention, these pins are in position location basically, but it is contemplated that first pin can be with respect to being arranged on the structure that first second pin of selling top or below is changed.As a selectable mode with these pins on the circumference of pipeline placed around in level, these pins are set to make their and form as the stair of building, as seen this structure is common has in the heat exchanger of surperficial amplifier unit of continuous surface in employing.Can US3,752,228, US4 be disclosed referenced patent, 258,782, US4,227,572, US4,648,441, US5,240,070, US5,046,556, US3,621,178 and US5,617,916, all these open full contents with them are combined in the current specification as a reference to be used for all purposes.

Known that the boiler and the heat exchanger that comprise the pin pipeline can produce the high levels of noise that is difficult to accept.This noise has been confirmed as mainly being made up of the single-frequency tone in the 300-700Hz scope.The making a thorough investigation of noise mechanism of production of causing this tone to produce analyzed, and had realized that this tone originates from the convection cell of boiler.

Cyclic fluctuation meeting on pipeline 24 in the air-flow of pin back causes unsettled pressure oscillation on these sell self, this can be in inside as sound source.Suppose and do not have backflow, these sound sources can reasonably be approximately the point dipole with frequency distribution, the maximum of this frequency distribution is round the frequency from nondimensional Si Telao Hull number, and the crest frequency that is defined as pressure oscillation at this Si Telao Hull number multiply by the diameter of pin and divided by the free stream mean flow rate.

If do not reflux, the frequency response of forcing the sound in convection cell 22 depends on the structure of this chamber, and supposition seldom or do not have a damping, the frequency of the generation of forced peak response set is equaled the intrinsic frequency of convection cell 22.But, when having remarkable damping, the real part of the intrinsic frequency of this pattern complexity of frequency departure of generation peak response.The ingenious prediction to observed frequency of this mathematics has material impact.

Can determine to make crooked pin to carry out bending towards air-flow by experience constructs pipeline 24 and can reduce by the cyclic fluctuation in the air-flow of pin back noise generated and do not have an additional pressure drop.In the previous embodiment of all boilers, wherein boiler comprises the pipeline with surperficial enlargement part, for example sells or inserted trick, and this surface enlargement part is carried out bending, i.e. downstream direction in the direction along with air-flow.

Noise can further be reduced by introduce sound-absorbing material on the sidewall of convection cell 22, Rockwoll material for example, selectively this sound-absorbing material can be arranged on

wall

36,44, between 40 and 42 the outside, the outside of boiler can be used or be fixed to further selectable sound-absorbing material, for example on the discharge duct of deriving from boiler, perhaps selectable among discharge duct.

By after comprising the part of lacking pin 26 and comprising the part of having strong market potential, flue gas is discharged from boiler 10 by exhaust outlet 30 in flue gas.

Boiler 10 further is equipped with the hopper 32 that is communicated with pipeline 24 joint fluids.Surface and the surperficial enlargement part of this hot flue gas by pipeline 24, the pin on pipeline for example, therefore transfer of heat sends heat to water or the steam of collecting in pipeline 24 inside to pipeline 24 from hopper 32.Water is heated in pipeline 24 inside and evaporates, and steam rises and to enter in the vaporium 34, and steam can be condensed into water once more in this chamber, and turns back in the hopper 32 by means of the pipeline in the sidewall of furnace chamber 14.In current preferred embodiment of the present invention, steam is discharged into not to be had in the illustrated system, and steam is used to other purpose in this system, and for example, the oil in the burner for heating 12 and be used for the driving pump system is than also not illustrating.Water in boiler 10 inside can carry out supply from external water source.

Fig. 2 is the cutaway view along the boiler of Fig. 1 of line A-A.Fig. 2 shows the layout by the pipeline 24 in four

discharge pipe walls

36,38,40 and 42 convection cells 22 that constitute.These pipelines and the bonding jumper that is welded between the adjacent channel interconnect, thereby set up a wall.Furnace chamber 14 is made of wooden partition 44.At the top of the pipeline that constitutes wall 42, some pipelines are outwardly-bent setting up exhaust outlet 30, and do not have bonding jumper to be soldered on the pipeline in this zone.

If Fig. 2 further shows the layout that has burner outlet 12 in furnace chamber 14.Many struts 46 are used to support the top and the bottom of vaporium 34.

In convection cell 22, two sound-absorbing

members

50,52 that are provided with between pipeline 24 are illustrated.Sound-absorbing

member

50,52 partly is used for separating convection cell 22, and therefore changes the acoustic characteristic of convection cell 22.Sound-absorbing

member

50,52 is preferably the type with the characteristic that does not cause pressure drop.In currently preferred embodiment of the present invention, sound-absorbing member 50,52nd, the plate of the material described in EP0876539B1.The sound-absorbing member of Cai Yonging is the Sontech Noisecontrol of company of Sweden of buying on market in a preferred embodiment of the invention, and name of product is the product of AcustiMet.

Fig. 3 shows the zoomed-in view of box B of a plurality of pipelines 24 of the boiler of sound-absorbing member 52 and Fig. 1 and 2.Pipeline 24 is placed to cellular structure, is used to realize to sell the maximal density with pipeline, but other structure also it is contemplated that, square for example, circular or any other geometric configuration or their combination.Sound-absorbing member 52 is flexible, makes it can be placed at least two close clearances between the adjacent pin 28.In current preferred embodiment of the present invention, the gap between the pin changes between 3 to 5mm.Theoretic gap between the pin is 6mm.

Fig. 4 is the sketch along the line C-C of Fig. 3, shows the spatial distribution with respect to the pin 28 of the shown thermal current direction of arrow R, and the layout of sound-absorbing member 52.

In case produce noise in boiler, it will mainly propagate on the ship by discharge duct.Any noise that is sent to the cabin by boiler component is with respect to being likely inappreciable from the higher inside levels of background noise of coming such as ventilating system.

Normal pipe muffler can make sound attenuating by the quieter material that employing is arranged on the perforated metal back in the baffle plate.The installation of the muffler source that can not abate the noise in the discharge duct of boiler absorbs it but be used in noise after producing.The muffler of a 1m can reduce about 15-30dB (A) according to its pressure drop that can adapt to.

It is simple that muffler is installed, effectively and flexibly settling mode.For the sound attenuating that needs under acceptable pressure drop, and can not cause that additional noise increases owing to flowing through muffler itself, the selection of suitable muffler is direct relatively technological procedure.

Also should be noted that if except also having noise propagation paths other, on the source, do not solve noise problem and still can produce the possibility that noise can be discovered by discharge duct.

The purpose that sound absorber among the convection cell is introduced is that the initial voice response that prevents this chamber reaches the level of enough facilitating reflux course.Cold test results shows that this is that very successful mode is eliminated interaction mechanism, and therefore reduces sound levels significantly.

Sound absorber in convection cell can be plate, for example solid slab or porous plate.

This porous plate allows to flow work by the aperture in the plate by keeping the pressure reduction that passes this plate simultaneously.Pressure drop be since inertia and viscous force in conjunction with caused, and cause the loss of acoustic energy, it is equivalent to because the active difference of pressure on the both sides of plate.In fact, this energy is converted to heat by the viscous effect in flowing through this plate.By quite there being strategy ground that these plates are placed in the chamber, can realize very high absorption for some pattern.

Cold test results shows and adopts porous plate can realize significant decay.In a test, all tones are removed completely, cause the decay of about 50dB.

If porous plate is installed as the sound settling mode, needing first problem of explanation is the layout that concern these plates, and the layout of these plates can produce maximum decay and to the necessary attenuation of obstruction backflow effect.Unfortunately, cold test results can not be applied directly on the boiler, because the modal structure of boiler room is different fully with the structure of cold-test chamber.This is a part of owing to different geometries, and part is because the big vertical temperature gradient in boiler.

First step is the uniformity that is identified between the frequency of natural mode of observed frequency and undressed boiler.This need obtain pitch frequency from undressed boiler measured value needs the Calculation of Natural Frequencies value of the convection cell of this boiler equally.In case these patterns that are easy to reflux are identified, by in each pattern, calculating the optimal placement that attenuation just can be determined these plates for the difference layout.Whether by suitably measuring cold test results, it is possible that the appropriate value of decay is made valid estimation, and can estimate selected layout thus and can provide enough decay to hinder the backflow effect.

For each boiler size, the process of determining the optimal placement of plate in the convection cell is similar.

The acoustic characteristic of plate can be described by its resistivity, and it has been described in the pressure drop of passing this plate with by the relation between its flow velocity.Resistivity has the unit identical with acoustic impedance, and the optimal resistivity of plate equals the impedance of its air of placing.This is the problem of the key of a mandatory declaration, when in its boiler in heat as resolution policy during near porous plate, in of the axle center marked change of this temperature along this chamber.Resistivity problem suitable in calculating must be illustrated to determine optimum plate layout.Also must illustrate to the problem that transmits the aperture size of optimal resistivity under the fixed temperature.

To the selectable mode of porous plate is the sound-absorbing material that is positioned on the wall of this chamber.Single most important practical problem is to determine a kind ofly can to bear high temperature and can provide enough acoustic absorption to hinder the material of backflow effect simultaneously in boiler.

Be positioned at insulating materials on the wall along with certain degeneration can take place its acoustic characteristic of time, unless carry out regular and suitable cleaning.

Suppose to find suitable material, its process and the installation process of the plate of perforation of suitable installation is roughly similar.But in this case, for hindering the essential decay of backflow effect how many these problems is crucial, and main problem relates to number and the quantity that realizes the necessary material of required decay, particularly its thickness of the wall that sound-absorbing material need be placed on it.

The measurement of cold state experimental results can allow valid estimation how to constitute sufficient decay together with the calculating of the decay under each pattern, no matter whether given layout can provide enough decay to hinder the backflow effect.

The introducing sound-absorbing is with solid slab the chamber to be separated to the selectable settling mode of this chamber, attempts to create a plurality of less chambers, and the cross section pattern of the chamber that these are less has the bigger frequency of the highest stimulating frequency than observed Peak Flow Rate in boiler.

Temperature at the top, chamber can be determined low-limit frequency, and cross section pattern given under this frequency can exist.About 300 ℃ of the temperature at boiler top.For the frequency of the natural mode in minimum cross section 300 ℃ the time greater than 700Hz, the extreme length of seed cell should be no more than about 30cm.This is equivalent to this chamber is divided into leg-of-mutton seed cell, and each seed cell surrounds three pin pipelines.

Final resolution policy be to guide non-stationary flow with attempt to cause can not cause can with the exciting of interactional voice response significantly of flowing.Realize that this purpose has dual mode.The first,, if Si Telao Hull number can be reduced so that the highest stimulating frequency remains under the low-limit frequency of cross section pattern, reflux so and can be avoided or be delayed to higher flow velocity.The second, it may utilize 3-D effect in flowing, to produce exciting the less unanimity of the influence of acoustic response, less association and less sensitivity.

Test has shown when the 43mm pin carries out bending with standard mode, can produce the most significant improvement, but except the rightabout, thereby make them be oriented to favour with the pin of stiff end upstream free-ended mobile.This structure causes the higher speed that is deferred in the improvement of noise level and tone begin.

Compare the beginning of the tone about 250Hz from 8.7ms with the configuration of the 43mm of standard pin ^-1Be deferred to 9.3ms ^-1(7%), but the noise level of following high 7dB when beginning, and at the high 3dB in maximum place.Tone about 420Hz is from 13.9ms ^-1Be deferred to 15.8ms ^-1(14%), noise level reduces 7dB when beginning, and reduces 5dB at the maximum place.At last, the tone about 690Hz is from 21.1ms ^-1Be deferred to 23.6ms ^-1(12%), noise level reduces 16dB when beginning.

It seems that these results show that beginning the place at tone postpones about 10%.Be applied on the boiler, this will mean that the tone that occurs will be deferred to about 75% under 70% load.After adjusting, the tone that occurs under 93% load will be deferred to 96%.

Claims

1. heat exchanger that is used for heat-shift between first medium and second medium comprises:

A housing, this housing have a compartment that surrounds a plurality of parallel pipelines, and described compartment comprises import and outlet, and they are arranged so that so described first medium is forced to flow with the flow direction that is parallel to described pipeline to described outlet from described import;

A plurality of elongated surperficial enlargement part are used to improve heat exchange, and each has first end that is fixed on one of them described pipeline, and tilt and substantially laterally extend to second free end with respect to the described flow direction.Described second free end is positioned at the upstream of described first end with respect to the described flow direction.

Described pipeline is set to cellular structure, described heat exchanger comprises that also at least one sound that is installed at least two bendings between the described pipeline suppresses plate, thereby make described compartment be subdivided into two or more sub-compartments, the cross section pattern of this a little compartment has the bigger frequency of the highest stimulating frequency than observed Peak Flow Rate in boiler.

2. heat exchanger as claimed in claim 1, when 300 ℃ of the temperature at boiler top, the maximum length of sub-compartment is no more than 30cm.

3. heat exchanger as claimed in claim 1 is characterized in that, described surperficial enlargement part is a pipe shape.

4. heat exchanger as claimed in claim 1 or 2 is characterized in that, described surperficial enlargement part defines one 10 length range to 60mm between described first end and described second free end.

5. heat exchanger as claimed in claim 1 or 2 is characterized in that, the length range that described surperficial enlargement part defines between described first end and described second free end is 20 to 50mm.

6. heat exchanger as claimed in claim 1 or 2 is characterized in that, the length range that described surperficial enlargement part defines between described first end and described second free end is 40 to 50mm.

7. heat exchanger as claimed in claim 1 or 2 is characterized in that, the length range that described surperficial enlargement part defines between described first end and described second free end is 41 to 49mm.

8. heat exchanger as claimed in claim 1 or 2 is characterized in that, the length range that described surperficial enlargement part defines between described first end and described second free end is 43mm.

9. heat exchanger as claimed in claim 1 or 2 is characterized in that, described surperficial enlargement part is become by steel, aluminium or copper.

10. heat exchanger as claimed in claim 1 or 2 is characterized in that, described surperficial enlargement part is defined as curve.

11. heat exchanger as claimed in claim 1 or 2 is characterized in that, described sound suppresses plate and comprises the hole of a plurality of sizes in 0.01mm arrives the 2mm scope.

12. heat exchanger as claimed in claim 1 or 2 is characterized in that, described sound suppresses plate and comprises the hole of a plurality of sizes in 0.5mm arrives the 1.5mm scope.

13. heat exchanger as claimed in claim 1 or 2 is characterized in that, described sound suppresses plate and comprises the hole of a plurality of sizes in 0.75mm arrives the 1.25mm scope.

14. heat exchanger as claimed in claim 1 or 2 is characterized in that, described sound suppresses plate and comprises the hole of a plurality of sizes at 1mm.

15. heat exchanger as claimed in claim 11 is characterized in that, described hole is oval, circle, rectangle or their any combination.

16. heat exchanger as claimed in claim 1 or 2 is characterized in that, described sound suppresses plate by steel, and aluminium or ceramic material are made.

17. heat exchanger as claimed in claim 1 or 2 is characterized in that, described sound suppresses plate and has the thickness of 0.508mm to 5.08mm.

18. heat exchanger as claimed in claim 1 or 2 is characterized in that, described sound suppresses the thickness that plate has 1.016mm or 2.032mm or 3.048mm or 1mm.

19. heat exchanger as claimed in claim 1 or 2 is characterized in that, described first medium is a flue gas, and described second medium is mainly water and/or steam.

20. a boiler particularly is installed in the boiler in the seagoing vessel, it comprises according to the described heat exchanger of arbitrary claim in the claim 1 to 19.

21. heat exchanger as claimed in claim 1 or 2 is characterized in that, described surperficial enlargement part is made by stainless steel.

22. heat exchanger as claimed in claim 1 or 2 is characterized in that, described sound suppresses plate and is made by galvanized steel.