CN208595537U

CN208595537U - A kind of boiler

Info

Publication number: CN208595537U
Application number: CN201721930124.5U
Authority: CN
Inventors: 马成果
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-12-29
Filing date: 2017-12-29
Publication date: 2019-03-12
Anticipated expiration: 2027-12-29

Abstract

The utility model provides a kind of boiler, it is with combustion chamber, burner hearth and the long cavum laryngis for connecting combustion chamber and burner hearth, long cavum laryngis narrows relative to combustion chamber and section of burner hearth and with 1 meter to 4 meters of height, and boiler its also there is the urea spout positioned close to long cavum laryngis and burner hearth intersection.In addition, the front screen portion for limiting burner hearth forms inner fovea part of the concave surface towards front wall, thus extend the travel path of flue gas.Furthermore, boiler includes the horizontal flue with roof of the furnace connection, and boiler has the groove profile segregator being located in horizontal flue, and groove profile segregator arranged beneath has flue-dust retainer, flue-dust retainer can be selectively connected with the hearth, and be rekindled so that the cigarette ash of collection is sent into burner hearth.Boiler according to the present utility model high temperature denitration and can realize fly-ash reburning and dedusting in stove.

Description

A kind of boiler

Technical field

The utility model relates to a kind of boiler, especially a kind of high temperature denitration, fly-ash reburning, boiler having dust removed inside.

Background technique

Nitrogen oxides (NOx) is one of the nuisance that boiler is discharged with cigarette, and the control to NOx emission is current protection atmosphere One of most important measure of environment.Following manner is generallyd use for the control of NOx, first is that with fuel-rich, weary oxygen in burning Method reduce ignition temperature come reduce heating power type nitrogen generate NOx amount；Second is that carrying out non-catalytic go back to the flue gas containing NOx Original place reason, generates the nitrogen and water of nonhazardous；Third is that carrying out catalytic treatment to low-temperature flue gas (at 350 DEG C).

From economic, convenient, practical angle is applied, in burning, control NOx generation amount is optimal selection, can be mitigated in this way The burden such as difficulty, complexity and economic cost to fume treatment.Layer burner has fuel stratification, sky simultaneously on combustion system The innate advantage of gas layering, weary oxygen Combustion Energy controls NOx in 250-350mg/m under the premise of can guarantee not cutoff³Hereinafter, Spraying into aqueous solution of urea in flue gas again and carrying out non-catalytic reduction is that can reach state key area NOx emission standard or more high standard It is quasi-.

Currently, the method for the spray urea reduction NOx generallyd use is in roof of the furnace or in back-end surfaces i.e. economizer Urea liquid is sprayed into the flue in proparea and carries out denitration, and there are low (the separate optimum temperatures of the temperature of reduction reaction for this mode 800-950 DEG C), the NOx and urea concentration that the time of reaction, space, path are limited and escape are high and cannot reach ideal denitration Effect, and soot dust granule humidifying can be will cause economizer tail by the water in the water and urea liquid generated during the reaction The serious bonded deposit of portion's heating surface, less serious case block heat exchange, and severe one blocks economizer.In addition, in the method drop with fuel-rich, weary oxygen In the case that low combustion temperature generates the amount of NOx to reduce heating power type nitrogen, the uncompleted burned carbon in flue gas increases, to cause to fire Efficiency decline is burnt, energy consumption increases.

Therefore, it is welcome for being able to solve technical solution any in above-mentioned technical problem.

Utility model content

The utility model is directed to solve the deficiency of background technique.

One, in denitration, urea spout is moved forward into burner hearth inlet to greatest extent, thus extends the reaction of denitration reaction Time simultaneously to be more fully mixed.In addition, long cavum laryngis is arranged by urea spout by being arranged between combustion chamber and burner hearth The flue-gas temperature at place is controlled in 800-950 DEG C of range of best reduction reaction temperature, in this way optimizes the temperature of denitration reaction, In addition, so that further extending flue gas travel path, increasing the reaction time, and make flue gas by the profile of construction burner hearth It is more fully mixed with urea.In addition, being remixed by the way that groove profile segregator is mandatory to remaining urea and NOx, significantly drop The concentration of low escape makes denitration more sufficiently effectively.

Two, it is not burnt on carbon in reducing flying dust, by groove profile segregator, flue flue-dust retainer, flying dust is returned into burner hearth again Combustion, then do not burn carbon caused by avoiding due to low-temperature burning and lose with plume, be improved efficiency of combustion.

Three, on reducing the viscous grey dust stratification in economizer tail portion caused by humidifying flue gas, by being arranged in specific shape Shielding afterwards makes soot dust granule be separated slag input slot side by side under inertia force, centrifugal force effect the water conservancy diversion of flue gas, both subtracts in this way Lack viscous ash, dust stratification retardance heat exchange, and considerably reduces the original dust exhausting concentration of boiler.

Four, it is guarantee urea spout not by high temperature scaling loss, spout is mounted in the header of front wall, is allowed to be in working-medium water Among cold, avoid being interrupted denitration because of scaling loss.

First aspect according to the present utility model provides a kind of boiler, has combustion chamber, burner hearth, which is characterized in that The boiler further includes the long cavum laryngis for connecting the combustion chamber and the burner hearth, and the long cavum laryngis is relative to the combustion chamber and institute Section of burner hearth is stated to narrow and with 1 meter to 4 meters of height, and the boiler its also have close to long cavum laryngis and burner hearth intersection The urea spout of positioning.

In a feasible embodiment, the section of the long cavum laryngis is rectangle.

In a feasible embodiment, the section of the long cavum laryngis is in a zigzag.

In a feasible embodiment, the urea notch setting is in the header of boiler front wall, to utilize connection Working-medium water realizes cooling in case.

In a feasible embodiment, the urea spout slightly raises up or the pipe of the header horizontally across front wall Wall, and its front end extends in burner hearth.

In a feasible embodiment, the boiler have with boiler Zuo Qiang, right wall is substantially vertical and prolongs from Zuo Qiang The preceding screen of the specific shape of right wall is extended to, the upper end shielded before described is connected to the drum in boiler crown wall, and lower end is connected to preceding screen In header；The combustion chamber, the burner hearth and the long cavum laryngis by the front wall of the boiler, Zuo Qiang, right wall and it is described before Screen limits.

In a feasible embodiment, before this part of the restriction burner hearth shielded before described forms concave surface towards boiler Thus the inner fovea part of wall extends the travel path of flue gas.

In a feasible embodiment, the cross section of the inner fovea part is arc or fold-line-shaped.

In a feasible embodiment, the inner fovea part includes vertical section, the first tilting section and the second tilting section, and The lower end of one tilting section and the upper end of vertical section are continuous, and the upper end of the second tilting section and the lower end of vertical section are continuous.

In a feasible embodiment, the boiler has the horizontal flue with roof of the furnace connection, so that Flue gas horizontal after travelling upwardly along the inner fovea part of the preceding screen can advance, so that the flue gas travel path of S-shaped is formed, by This further extends the travel path of flue gas.

In a feasible embodiment, the boiler also has with boiler Zuo Qiang, right wall is substantially vertical and from Zuo Qiang The rear screen of the specific shape of right wall is extended to, the upper end shielded after described is connected to the drum in boiler crown wall, and lower end is connected to pot The lower collecting box of wall after furnace.

In a feasible embodiment, the boiler has groove profile segregator, and groove profile segregator is connected to the pot Cylinder and be arranged in as the preceding screen upper end and it is described after defined by the upper end shielded in space, it is described before screen and it is described after shield Upper end all has respective first light pipe grid section.

In a feasible embodiment, it is described before screen have be located at below its first light pipe grid section and with first light The non-light pipe grid section of pipe grid section continuous first, it is described after screen also have be located at below its first light pipe grid section and with first light pipe The non-light pipe grid section of grid section continuous first, the preceding first non-light pipe grid section shielded and the first non-light pipe grid section shielded afterwards define Flue-dust retainer.

In a feasible embodiment, it is described before screen and it is described after screen also define it is below flue-dust retainer, and The gray back room of flue-dust retainer connection.

In a feasible embodiment, gravity flap valve, the bottom of gray back room are provided at the top of the gray back room It is limited by gray back guide plate shield after being extended to from the preceding screen, inclined, and the preceding screen is adjacent with the gray back guide plate The position of top has the second light pipe grid section to provide gray back mouth, thus when the flue dust collected in the flue-dust retainer reaches gravity When flap valve threshold value, flap valve overturning, flue dust falls to gray back guide plate and then enters via gray back mouth by the preceding screen and boiler The burner hearth that front wall limits.

In a feasible embodiment, screen is also defined below the gray back room after shielding before described and is described , economizer accommodation space for arranging economizer, the economizer accommodation space and the gray back room are by the gray back Guide plate is spatially isolated from one another, shields after described and is formed with smoke inlet on the part for limiting the economizer accommodation space.

In a feasible embodiment, the bottom of the groove profile segregator is connected with multiple flue gas damping sheets, flue gas Damping sheet with boiler Zuo Qiang, right wall is substantially vertical and extends to You Qiang, the first non-light pipe grid section on bottom edge and preceding screen from Zuo Qiang Relatively and with it with predetermined gap, the gap provides flue gas damping, to force flue gas in the first light for passing through the preceding screen The groove profile segregator is passed through after pipe grid section to advance towards the rear first light pipe grid section shielded, rather than is separated around groove profile Device.

In a feasible embodiment, the rear screen has and the described first non-continuous second light pipe of light pipe grid section Grid section, the second light pipe grid section limit the smoke inlet, the smoke inlet than the first light pipe grid section for shielding after described with The engaging portion of first non-light pipe grid section wall after boiler, so that flue gas is impacted by the horizontal flue The smoke inlet is oliquely downward traveled into after wall afterwards.

In a feasible embodiment, the side of wall after the close boiler of the smoke inlet is shielded after described and is provided with Dust board.

In a feasible embodiment, the dust board and boiler Zuo Qiang, right wall is substantially vertical and extends from left wall To right wall.

In a feasible embodiment, the space after shielding after described and is described between wall forms flue dust separation chamber, The flue dust separation chamber is for collecting the soot dust granule separated with flue gas.

In a feasible embodiment, the third light pipe grid section having positioned at its lower end is shielded after described, it is described Third light pipe grid section provides the dust collecting opening of the flue dust separation chamber.

In a feasible embodiment, the lid that the bottom connection one of the dust collecting opening can be opened and closed, Huo Zhelian A comb shape dedusting smoking box, generally comb shape are connect, a row of combs dentation dust flue with top dust hopper and lower part, institute It states dust hopper and limits dust storage chamber, the dust flue limits dust discharge access, and the dust storage chamber and the dust discharge access are communicating together, institute It states comb teeth-shaped dust flue to be separated from each other to limit smoke outlet, the boiler, which has, to be set to below the comb shape dedusting smoking box Sink, dust flue immerse sink in realize water seal, thus when in use, soot dust granule via dust collecting opening, comb shape dedusting arrange Dust hopper, the dust flue of smoke box fall to sink.

In a feasible embodiment, the dedusting smoking box is the tank body as made of welded steel plate, and outside Siding is equipped with inspection door to be opened/closed.

In a feasible embodiment, the comb shape dedusting smoking box is also used as boiler exterior wall.

The second aspect according to the present utility model provides a kind of boiler, with urea spout, the urea spout It is arranged in the header of boiler front wall, to realize cooling using working-medium water in header.

In terms of third according to the present utility model, a kind of boiler is provided, with burner hearth, wherein the burner hearth by The front wall of the boiler, Zuo Qiang, right wall and specific shape preceding screen limit, it is described before screen and Zuo Qiang, right wall it is substantially vertical and You Qiang is extended to from Zuo Qiang, and upper end is connected to the drum in boiler crown wall, lower collecting box is shielded before being connected in lower end；In front wall It limits and is provided with urea spout in the part of burner hearth, this part of the restriction burner hearth shielded before described forms concave surface towards the front wall Inner fovea part, thus extend flue gas travel path.

4th aspect according to the present utility model, provides a kind of boiler, including burner hearth and with roof of the furnace connection Horizontal flue, the boiler have be located at the horizontal flue in groove profile segregator, the groove profile segregator arranged beneath Have a flue-dust retainer, the flue-dust retainer can selectively with the burner hearth connection, so that the cigarette ash of collection is sent into burner hearth again Burning.

In a feasible embodiment, the boiler have with boiler Zuo Qiang, right wall is substantially vertical and prolongs from Zuo Qiang The preceding screen of the specific shape of right wall is extended to, the upper end shielded before described is connected to the drum in boiler crown wall, and lower end is connected to preceding screen Lower collecting box；And the boiler also has and boiler Zuo Qiang, right wall is substantially vertical and extends to the specific shape of right wall from Zuo Qiang Rear screen, it is described after shield upper end be connected to the drum in boiler crown wall, lower end is connected to the lower collecting box of wall after boiler；The slot Type separator is connected to the drum and is arranged in the space as defined by the upper end and the rear upper end shielded of the preceding screen, And the preceding screen and the rear upper end shielded all have respective first light pipe grid section；Screen, which has, before described is located at its first light pipe Below grid sections and with the non-light pipe grid section of the first light pipe grid section continuous first, it is described after screen also have and be located at its first light pipe grid Section lower section and with the non-light pipe grid section of the first light pipe grid section continuous first, the first non-light pipe grid section shielded before described and shields afterwards First non-light pipe grid section defines the flue-dust retainer.

In a feasible embodiment, screen is also defined below the gray back room after shielding before described and is described , economizer accommodation space for arranging economizer, the economizer accommodation space and the gray back room are by the gray back Guide plate is spatially isolated from one another.

5th aspect according to the present utility model, provides a kind of boiler, with horizontal flue, the horizontal flue Wall after face boiler, and and then the downstream smoke inlet of horizontal flue is located so that the flue gas is passing through the horizontal flue It oliquely downward advances after wall far from rear wall after impact, to be divided soot dust granule and flue gas using inertia force and centrifugal force From.

In a feasible embodiment, the boiler have with boiler Zuo Qiang, right wall is substantially vertical and prolongs from Zuo Qiang The rear screen of the specific shape of right wall is extended to, the upper end shielded after described is connected to the drum in boiler crown wall, and lower end is connected to boiler The lower collecting box of wall afterwards；After described screen there is the first light pipe grid section positioned at upper end, be located at below the first light pipe grid section and with this One the continuous first non-light pipe grid section of light pipe grid section and with the described first non-continuous second light pipe grid section of light pipe grid section；Institute Horizontal flue is stated across the first light pipe grid section；The second light pipe grid section limits the smoke inlet, after the smoke inlet ratio The first light pipe grid section of screen and the engaging portion of the described first non-light pipe grid section wall after boiler, so that described Flue gas wall far from after after the wall after horizontal flue impact is oliquely downward advanced.

In a feasible embodiment, the third light pipe grid section having positioned at its lower end is shielded after described, it is described Third light pipe grid section provides dust collecting opening.

In aforementioned all aspect and embodiment, front wall, Hou Qiang, Zuo Qiang, You Qiang, roof wall, preceding screen, rear screen are all membrane types Wall construction, and the boiler is grate firing boiler.

To sum up, this high temperature denitration fly-ash reburning boiler having dust removed inside has original synthesis superior in denitration, energy conservation, emission reduction Performance, and also there is some superiority in economical operation and feasibility.

Detailed description of the invention

Fig. 1 is the schematic isometric cross-sectional view of the boiler of an embodiment of the present invention.

Fig. 2 is the side schematic sectional view of Fig. 1 embodiment.

Fig. 3 is the schematic cross sectional views of the embodiment of urea spout.

Fig. 4 is the partial cross-sectional view of comb shape dedusting smoking box.

Specific embodiment

Figures 1 and 2 show that according to the schematic sectional perspective view and correspondence of the boiler of an embodiment of the present invention Schematic sectional view.The embodiment contains several aspects of the utility model, but those skilled in the art are by hereinafter Description it would be appreciated that, these aspect can both be applied in combination, also can be used alone.The following detailed description of.

Referring first to Fig. 1 and Fig. 2, the boiler of the embodiment according to the present utility model has front wall 100, rear wall 200, a left side Wall 300, right wall 400 and boiler roof wall 500.These walls define the inner space of boiler.In the inner space, setting Screen 10 and rear screen 20 before having.Before described screen 10 with boiler Zuo Qiang, right wall is substantially vertical and extends to You Qiang from Zuo Qiang, and have special Fixed shape, the upper end that 10 are shielded before described are connected to the drum 50 in boiler crown wall, and lower end is connected to lower collecting box 106.Similarly, It is described after screen 20 also with boiler Zuo Qiang, right wall is substantially vertical and also extends to You Qiang from Zuo Qiang, also there is specific shape, and Upper end is also connected to the drum 50 in boiler crown wall, and lower end is connected to the lower collecting box 23 of rear wall 200.

Preferably, above-mentioned front wall, Hou Qiang, Zuo Qiang, You Qiang, roof wall, preceding screen, rear screen are all membrane wall structures.This field Technical staff will be appreciated that, membrane wall be usually to be welded with more fin tube side-by-sides of roll forming or be light pipe it Between Welding flat steel (flat steel sheets) and formed wall-like structure.Membrane wall can have light pipe grid section, i.e., the section only have light pipe and Not Welding flat steel (or the pipe of this section is without fin), to for example conveniently pass through flue gas.Therefore, membrane wall may include light pipe Grid section and non-light pipe grid section.The preceding screen in the utility model and rear screen include light pipe grid section and non-light pipe grid section, It is described in detail hereinafter.

As for " header ", those skilled in the art can know, also referred to as " header ", refer in the boiler many effects one It causes, the elongate cylindrical pressure vessel that pipe arranged in parallel connects together.Header mainly rises in systems to be collected, mixes, dividing again Effect with working medium (usually water).The heating surfaces such as water cooled membrane wall, economizer, superheater, the reheater of boiler will be used A large amount of header.The much numbers of header are made of seamless steel pipe larger-diameter, as heating surface material.Existed according to header The location of restrain in length, header can be divided into upper header (be located at tube bank upper end), middle header (it is intermediate to be located at tube bank), Lower collecting box (is located at tube bank lower end, such as the lower collecting box 23 of rear wall 200).Above-mentioned " drum 50 " is actually also a kind of header.

Fig. 1 and Fig. 2 shows embodiment in, the front wall 100 and preceding screen 10 (are being illustrated along the direction that flue gas is advanced In embodiment from bottom to top) sequentially define combustion chamber 101, combustion chamber throat 2, long cavum laryngis 4 and burner hearth 8.

The upper end of preceding screen 10 and rear screen 20 has light pipe grid section, and light pipe grid section defines horizontal flue 14, from burner hearth 8 Flue gas can downstream advance through horizontal flue 14.Flue dust separation chamber 21 can also be formed between screen 20 and rear wall 200 afterwards.

According to a preferred embodiment, the top of 20 the two of the preceding screen 10 and rear screen can limit funnelform collection ash Bucket 15, the lower part of the two can limit the economizer accommodation space 61 for accommodating economizer 60, and the middle part of the two can limit Gray back room 11.The bottom of gray back room 11 is limited by inclined gray back guide plate 9, and gray back guide plate 9 accommodates flue-dust retainer 15 and economizer The isolation of both spaces 61 is opened.

What needs to be explained here is that the orientation such as " up, down, left, right, before and after " herein description is for easy reason The purpose of solution and orientation combining Figure 1 and Figure 2 does not constitute limitations of the present invention come what is described.

Next several aspects of the utility model are described one by one.

One, denitration

The first aspect of the utility model is related to denitration.Main technical concept includes: firstly, most by urea spout 5 Limits move forward to the inlet of burner hearth 8, thus extend the reaction time of denitration reaction and to be more fully mixed；Secondly, The flue-gas temperature control of urea nozzle is most preferably being restored and long cavum laryngis 4 being arranged between combustion chamber 101 and burner hearth 8 800-950 DEG C of range of reaction temperature；Third provides the contoured of burner hearth, so that further by the shape of screen 10 before designing Extend flue gas travel path, increases the reaction time, and flue gas and urea are more fully mixed；Finally, passing through groove profile point It is mandatory to remaining urea and NOx from device 12 to remix, it realizes further denitration, the concentration of escape is greatly lowered.Below Above-mentioned several aspects are described in detail.

As depicted in figs. 1 and 2, according to the boiler of the utility model first aspect include: combustion chamber 101, burner hearth 8 and The long cavum laryngis 4 of the combustion chamber and the burner hearth is connected, the long cavum laryngis is cut relative to the combustion chamber 101 and the burner hearth 8 Face narrows.The height of long cavum laryngis 4, generally can be between 1 meter to 4 meters depending on fuel and ignition temperature.

In the illustrated embodiment, the combustion chamber 101, the burner hearth 8 and the long cavum laryngis 4 by the boiler front wall 100, left wall 300, right wall 400 and preceding screen 10 limit, but it can also be by other structure qualifications, this is practical without departing from this Novel range.

The face arch 1 and rear arch 3 that limit combustion chamber 101 are separately positioned on the lower part of the front wall 100 and preceding screen 10.Fuel Burning generates flue gas in combustion chamber 101, and flue gas is upwardly into long cavum laryngis 4 through combustion chamber throat 2 from combustion chamber 101, then into Enter burner hearth 8.Working medium hydrothermal exchange of flue gas when through long cavum laryngis 4 and in front wall and preceding screen, to be at the top of long cavum laryngis Optimal no catalytic denitration reduction reaction temperature is down to burner hearth intersection temperature, about 800-950 DEG C.Urea spout 5 is arranged In the intersection with long cavum laryngis 4 of burner hearth 8, so that the flue gas with optimum temperature is mixed with the urea gas-liquid sprayed by urea spout Close the raw reduction reaction of object hybrid concurrency.Since flue gas has optimal reaction temperature, reduce the production quantity of NOx, improves Denitration effect.

Unlike the utility model for being provided with long cavum laryngis, in the prior art, boiler is at most provided only with aditus laryngis 2 Without long cavum laryngis 4.Compared with the long cavum laryngis 4, the height of aditus laryngis 2 almost can be ignored (usually only ten or twenty centimetre Magnitude).In the prior art, urea spout or the top that burner hearth 8 is arranged in or setting are at aditus laryngis 2.It is arranged on burner hearth top Portion's problems faced is that smoke reaction temperature is too low, and mixes shorter with the reaction time；Problems faced is set at aditus laryngis It is that flue-gas temperature is excessively high, so that reduction reaction can not almost be effectively performed.And in the present invention, by the way that long cavum laryngis is arranged 4 and by urea notch setting in the intersection with long cavum laryngis of burner hearth, flue gas carries out after heat exchange at temperature with long cavum laryngis 4 Be down to optimal reaction temperature, and can be mixed and be reacted since the entrance of burner hearth, thus be more fully mixed and Reaction time is longer, so as to maximumlly reduce the generation of NOx.

In Fig. 1 and embodiment illustrated in fig. 2, the section of the long cavum laryngis is rectangle.However, in other feasible realities It applies in example, the section of the long cavum laryngis may be other shapes, for example, the meander-shapeds such as zigzag, so as to not increase The passage path for increasing flue gas in the case where lengthening cavum laryngis height, extends heat-exchange time.The cross sectional shape of long cavum laryngis can pass through The shape of the setting of front wall and preceding screen is realized.

In addition to the control to reaction temperature, the utility model is contemplated that the shape to preceding screen is designed, to extend flue gas Travel path increases the reaction time, further improves denitration effect with this.For this purpose, shielding this of 10 restriction burner hearth 8 before described A part forms inner fovea part of the concave surface towards boiler front wall 100, thus extends the travel path of flue gas, as depicted in figs. 1 and 2. The lower end of inner fovea part is flushed with urea spout substantially.In this way, the flue gas for being upwardly into burner hearth 8 through long cavum laryngis 4 is sprayed by urea spout 5 Urea gas-liquid mixture out presses to 8 right side of burner hearth, that is, the inner fovea part of screen 10 before being pressed towards, then along the concave shape of preceding screen It advances, 8 top of burner hearth is finally reached, in this way, extending the reaction time of flue gas Yu urea gas-liquid mixture.

In Fig. 1 and non-limiting embodiment illustrated in fig. 2, the cross section of the inner fovea part is fold-line-shaped, particularly It is three-stage fold-line-shaped, including vertical section A, the first tilting section B and the second tilting section C, the lower end of the first tilting section B and vertical section The upper end of A is continuous, and the upper end of the second tilting section C and the lower end of vertical section A are continuous.It will be appreciated that the inner fovea part can also To be other fold-line-shapeds, or other concave shape such as arcs, as long as flue gas travel path can be extended.

In order to further improve denitration effect, the utility model, which is contemplated that, is arranged groove profile in the horizontal flue 14 of flue gas Separator 12.When passing through groove profile segregator 12, flue gas mixes again with urea, to have neither part nor lot in the remaining urea of reduction reaction And nitrogen oxide NOx row sufficiently reduction again, further improve denitration effect.

Two, urea spout

The second aspect of the utility model is related to the setting of urea spout.One aspect according to the present utility model, ginseng See that Fig. 1 to Fig. 3, urea spout 5 are arranged in the header 102 of front wall 100, thus it is cooling by working-medium water in header, and then avoid High temperature scaling loss caused by the urea spout of burner hearth, it is ensured that the safe handling of the urea spout.

In a preferred embodiment, urea spout 5 is made of metal material identical with front wall header 102, with example Such as convenient for the welded connecting of the two.Urea spout 5 can slightly raise up or horizontally across front wall header 102 tube wall and with it is described The weldering connection sealing of header 102.The angle that raises up is usually no more than 30 °.The advantages of urea spout slightly raises up is: flue gas from compared with Speed slows down, density becomes smaller when narrow long cavum laryngis enters the expansion space of wider burner hearth, and slightly raise up can for urea spout at this time So that more urea mix in the region that velocity of flue gas slows down, density becomes smaller with flue gas, to be more fully mixed.Urea spray The rear end of mouth 5 can be socketed the hose 53 for conveying liquid gaseous state urea, and the front end 52 of urea spout 5 can exceed header 102 It extends in burner hearth 8, the length exceeded is in 10-20 millimeters of ranges.

Three, fly-ash reburning

It is related to fly-ash reburning in terms of the third of the utility model.That is, the soot particulates by collection are (mainly uncombusted Carbon) it is re-fed into burner hearth and burns again, to improve efficiency of combustion, reduce energy consumption.For this purpose, the utility model is provided with groove profile point From device and thereunder provided with flue-dust retainer, the flue-dust retainer property of can choose it is connected with the hearth, so that the cigarette ash in flue-dust retainer can To be sent back to burner hearth again, re-ignition is realized.As the scheme further improved, the utility model is also designed rear screen, Further to collect the cigarette ash from the flue gas that groove profile segregator comes out using its light pipe grid section with horizontal extension component Grain.It is explained in detail below.

Firstly, referring to Fig. 1 and Fig. 2, the preceding screen and the upper end shielded afterwards are connected to the drum 50 in boiler crown wall.By In space defined by the upper end and the rear upper end shielded shielded before described, it is disposed with groove profile segregator 12, groove profile segregator It is connected to the drum 50.The upper end of screen 10 has the first light pipe grid section D before described, and 20 upper end is shielded after described has the first light Pipe grid section E to allow flue gas into groove profile segregator 12 between the two, and leaves from groove profile segregator 12.

Screen 10 has below its first light pipe grid section D and non-with the first light pipe grid section D continuous first before described Light pipe grid section B, it is described after screen 20 also have be located at below its first light pipe grid section E and with the first light pipe grid section E continuous the One non-light pipe grid section F, the preceding first non-light pipe grid section B shielded and the first non-light pipe grid section F shielded afterwards define flue-dust retainer 15.

Screen 10 and the rear screen 20 also define gray back room positioned at 15 lower section of flue-dust retainer, with flue-dust retainer connection before described 11.In the illustrated embodiment, the gray back room is limited by the vertical section of front and back screen, but can also be by other shapes and direction Section limit.

As depicted in figs. 1 and 2, it is provided with gravity flap valve 16 at the top of the gray back room, the bottom of gray back room is by from institute After screen 10 extends to before stating screen 20, inclined gray back guide plate 9 limit, and it is described before screen 10 with the gray back guide plate 9 close to The position of top have the second light pipe grid section A1 to providing gray back mouth 17, thus when the flue dust collected in the flue-dust retainer 15 When reaching the threshold value of gravity flap valve 16, flap valve 16 is overturn, and flue dust falls to gray back guide plate 9 and then via 17 weight of gray back mouth Newly enter in burner hearth 8 and rekindled in the high-temperature flue gas stream of rising, realizes re-ignition.

In order to ensure flue gas pass through it is described before shield the first light pipe grid section D after pass through the groove profile segregator 12 without It is to bypass groove profile segregator 12, the bottom of the groove profile segregator 12 is connected with (such as welding) multiple flue gas damping sheets 13, cigarette Gas damping sheet 13 with boiler Zuo Qiang, right wall is substantially vertical and extends to You Qiang, the first non-light on bottom edge and preceding screen 10 from Zuo Qiang For pipe grid section B relatively and with it with predetermined gap d, the gap provides flue gas damping.The preferably vertical arrangement of flue gas damping sheet 13. By the way that flue gas damping sheet is arranged, actually flue gas is prevented to bypass, so that flue gas can only pass through groove profile segregator, because flue gas is logical Resistance (particularly in view of having the cigarette ash fallen from groove profile segregator in the gap location) when crossing aforementioned gap d is obviously big In the resistance of the entrance side from groove profile segregator to outlet side.In other words, by be arranged flue gas damping sheet, flue gas will substantially from Pass through inside groove profile segregator, advances from entrance side to outlet side, and downstream.Flue gas pass through groove profile segregator when, wherein Contained soot dust granule separates and with the shock of the extended surface tube of groove profile segregator and falls to flue-dust retainer 15.Groove profile segregator is this Known to the technical staff of field, structure is repeated no more.

An improved plan according to the present utility model, flue-dust retainer 15 are also further collected across groove profile segregator 12 Soot particulates in flue gas, this makes it have horizontal extension component by the shape for the upper end shielded after design to realize.

With shown in Fig. 1 and non-limiting embodiment shown in Fig. 2, the first light pipe grid section E shielded after described includes substantially perpendicular Straight section E1 and approximate horizontal section of E2.Approximate horizontal section of E2 provides the horizontal extension component of the first light pipe grid section E.In boiler operatiopn When, flue gas carries out the soot dust granule separation of first time when passing through groove profile segregator 12, then pass through roughly vertical section of E1, and Approximate horizontal section of E2 upper horizontal is advanced towards rear wall.Flue dust during advancing along approximate horizontal section of E2, in flue gas Particle can be fallen in flue-dust retainer 15 through horizontal segment E2 under the effect of gravity, to carry out second of soot dust granule separation.

Therefore, in the improved plan, on the one hand flue-dust retainer 15 collects the soot dust granule from groove profile segregator (it comes Gap d between flue gas damping sheet and preceding screen), on the other hand collect the flue dust from the flue gas that groove profile segregator comes out Grain.

In the illustrated embodiment, the first light pipe grid section D of the preceding screen 10 is the straight portions of roughly vertical arrangement, still , it is to be appreciated that light pipe grid section D also can have other shapes, such as arc or polygon.As described above, this field Technical staff will be understood that can also by the first light pipe grid section E of roughly vertical section of E1 and approximate horizontal section of the E2 rear screen 20 constituted To be replaced by the light pipe grid section of other forms, such as generally arcuate light pipe grid section or the linear type light pipe grid section of inclination arrangement, As long as it is with horizontal extension component.

To sum up, although screen 10 and rear screen 20 are by multistage vertical section and multistage tilting section structure before showing in diagram At " multi-segment structure ", but the utility model is not limited thereto.For example, adjacent two sections or more multistage can be by smoothed The segmental arc crossed replaces, as long as forward and backward screen can limit flue-dust retainer and gray back room.

Four, dedusting in stove

4th aspect of the utility model is related to dedusting in stove, specifically includes that offer horizontal flue, and make horizontal cigarette Wall after road face boiler, so that flue gas flings wall after boiler, and the shape by shielding after design, guides in horizontal flue Flue gas turned back with acute angle, so that the soot dust granule in flue gas wall and will be fallen due to inertia force and after hitting along rear wall, and And it is further removed under the action of the centrifugal force in acute angle steering procedure.

In the illustrated embodiment, horizontal flue is by the first light pipe grid section D on preceding screen top and first light on rear screen top Pipe grid section E is limited.Projection on the two light pipe grid Duan Cong front walls to the horizontal direction of rear wall is substantially aligned with, to limit water Flat flue, and wall after horizontal flue face boiler.

Screen 20 defines the smoke inlet 18 in horizontal flue downstream after described.Flue gas is will be under after horizontal flue The smoke inlet 18 of trip is advanced.In order to enable flue gas is turned back with acute angle, the smoke inlet 18 is than rear first light pipe shielded Wall 200 after boiler the engaging portion EF of grid section E and the described first non-light pipe grid section F, so that flue gas is passing through institute Wall 200 is oliquely downward advanced later after stating horizontal flue, and the soot dust granule in flue gas will be hit due to inertia force in the process It hits rear wall and is fallen along rear wall, and will also further be removed under the action of the centrifugal force in acute angle steering procedure.

In exemplary embodiment illustrated, the restriction economizer accommodation space 61 of rear screen 20 is arranged in the smoke inlet 18 Part on, such as provided by the second horizontal light pipe grid section H.

In a further preferred embodiment, after described screen 20 after the close boiler of the smoke inlet 18 wall 200 one Side is provided with dust board 19.The dust board 19 and boiler Zuo Qiang, right wall is substantially vertical and extends to You Qiang from Zuo Qiang, and preferably Ground is arranged vertically.

Space after described between screen 20 and the rear wall 200 forms flue dust separation chamber 21, the flue dust separation chamber 21 For collecting the soot dust granule separated above by inertia force and centrifugal force with flue gas.

The lower end of screen 20 is connected to the header 23 of rear wall 200 afterwards.Screen 20 has the third positioned at its lower end after described Light pipe grid section J, the third light pipe grid section J provide dust collecting opening 22.For the ease of collecting soot dust granule, the lower part of rear screen 20 can be with Inclination or arc extend, in order to which soot dust granule slides along it and gathers dust collecting opening 22.

The bottom of dust collecting opening 22 can connect a lid to be opened/closed, with timing deashing；Or it can connect one according to this reality With novel comb shape dedusting smoking box 24.Comb shape dedusting smoking box generally comb shape has top dust hopper 242 and lower part A row of combs dentation dust flue 244, the dust hopper limits dust storage chamber, and the dust flue limits dust discharge access, the dust storage chamber Communicating together with the dust discharge access, the comb teeth-shaped dust flue 244 is separated from each other to limit smoke outlet 246, the boiler With the sink 28 being set to below the comb shape dedusting smoking box, dust flue 244 immerses in sink 28 to realize water seal, thus When in use, soot dust granule falls to sink via dust collecting opening 22, the dust hopper 242 of comb shape dedusting smoking box, dust flue 244 28。

In a feasible embodiment, dedusting smoking box 24 is the tank body as made of welded steel plate, with dust collecting opening 22 Pass through flanged joint.Preferably, the outside siding of dedusting smoking box 24 is equipped with inspection door 245 to be opened/closed.

The comb shape dedusting smoking box 24 can be also used as boiler exterior wall, the i.e. extension as rear wall 200.

The economizer accommodation space 61 is spatially isolated from one another by gray back guide plate 9 with the gray back room 11.Scheming In the embodiment shown, the economizer accommodation space 61 is by the lower part of preceding screen 10, the lower part of rear screen 20, comb shape dedusting smoking box 24 Common to limit, economizer 60 will be arranged in the economizer accommodation space 61.Upstream flue gas enters via smoke inlet 18 saves coal Then device accommodation space 61 passes through economizer 60, finally from the smoke outlet between the dust flue 244 of comb shape dedusting smoking box 24 246 discharges.

In this way, according to the utility model, the soot dust granule of the water-wet generated by urea liquid and reduction reaction into Enter since inertia force and centrifugal force are separated and are discharged before economizer, it is big hence into the flue dust in the flue gas of economizer To reduce, to reduce economizer surface bonded deposit, heat exchange efficiency is improved, pot is on the other hand also considerably reduced The original dust exhausting concentration of furnace.

Seven, other aspects

Those skilled in the art will be understood that this specification aforementioned aspects can be used alone, can also be any group It closes and uses.In addition, those skilled in the art will be understood that the flue gas in entire boiler traveling can by air blower and/or Exhaust fan is realized.

Claims

1. a kind of boiler, there is combustion chamber, burner hearth, which is characterized in that the boiler further includes connecting the combustion chamber and described The long cavum laryngis of burner hearth, the long cavum laryngis narrow relative to the combustion chamber and the section of burner hearth and with 1 meter to 4 meters of height Degree, and the boiler also has the urea spout positioned close to long cavum laryngis and burner hearth intersection.

2. boiler as described in claim 1, wherein the section of the long cavum laryngis is rectangle.

3. boiler as described in claim 1, wherein the section of the long cavum laryngis is in a zigzag.

4. boiler as described in claim 1, wherein the urea notch setting is in the header of boiler front wall, to utilize Working-medium water realizes cooling in header.

5. boiler as described in claim 1, wherein the urea spout runs through the tube wall of the header of front wall with slightly raising up, And its front end extends in burner hearth.

6. boiler as described in claim 1, wherein the urea spout substantially horizontally runs through the tube wall of the header of front wall, And its front end extends in burner hearth.

7. boiler as described in claim 1, wherein the boiler has with boiler Zuo Qiang, right wall is substantially vertical and from Zuo Qiang The preceding screen of the specific shape of right wall is extended to, the upper end shielded before described is connected to the drum in boiler crown wall, before lower end is connected to Shield lower collecting box；The combustion chamber, the burner hearth and the long cavum laryngis by the front wall of the boiler, Zuo Qiang, right wall and it is described before Screen limits.

8. boiler as claimed in claim 7, wherein this part of the restriction burner hearth shielded before described forms concave surface towards boiler Thus the inner fovea part of front wall extends the travel path of flue gas.

9. boiler as claimed in claim 8, wherein the cross section of the inner fovea part is arc or fold-line-shaped.

10. boiler as claimed in claim 9, wherein the inner fovea part includes vertical section, the first tilting section and the second inclination Section, the lower end of the first tilting section and the upper end of vertical section are continuous, and the upper end of the second tilting section and the lower end of vertical section are continuous.

11. boiler as claimed in claim 8, wherein the boiler has the horizontal flue being connected with the hearth, so that cigarette Gas horizontal after travelling upwardly along the inner fovea part of the preceding screen can advance, to form the flue gas travel path of S-shaped, thus Further extend the travel path of flue gas.

12. boiler as claimed in claim 11, wherein the boiler also has with boiler Zuo Qiang, right wall is substantially vertical and from Left wall extends to the rear screen of the specific shape of right wall, and the upper end shielded after described is connected to the drum in boiler crown wall, lower end connection The lower collecting box of wall after to boiler.

13. boiler as claimed in claim 12, wherein the boiler has groove profile segregator, and groove profile segregator is connected to institute It states drum and is arranged in the space as defined by the upper end and the rear upper end shielded of the preceding screen, after shielding before described and is described The upper end of screen all has respective first light pipe grid section.

14. boiler as claimed in claim 13, wherein before described screen have be located at below its first light pipe grid section and with this One the continuous first non-light pipe grid section of light pipe grid section, it is described after screen also have be located at below its first light pipe grid section and with this first The non-light pipe grid section of light pipe grid section continuous first, the preceding first non-light pipe grid section shielded and the first non-light pipe grid section limit shielded afterwards Flue-dust retainer is determined.

15. boiler as claimed in claim 14, wherein screen and the rear screen also define below flue-dust retainer before described , with the gray back room of flue-dust retainer connection.

16. boiler as claimed in claim 15, wherein gravity flap valve is provided at the top of the gray back room, gray back room Bottom is limited by gray back guide plate shield after extending to from the preceding screen, inclined, and the preceding screen is tight with the gray back guide plate The position of adjacent top has the second light pipe grid section to provide gray back mouth, thus when the flue dust collected in the flue-dust retainer reaches When gravity flap valve threshold value, flap valve overturning, flue dust fall to gray back guide plate so that via gray back mouth enter by the preceding screen with The burner hearth that boiler front wall limits.

17. boiler as claimed in claim 16, wherein screen and the rear screen also define under the gray back room before described Economizer accommodation space square, for arranging economizer, the economizer accommodation space are returned with the gray back room by described Grey guide plate is spatially isolated from one another, shields after described and is formed with smoke inlet on the part for limiting the economizer accommodation space.

18. boiler as claimed in claim 14, wherein the bottom of the groove profile segregator is connected with multiple flue gas damping sheets, Flue gas damping sheet with boiler Zuo Qiang, right wall is substantially vertical and extends to You Qiang, the first non-light pipe on bottom edge and preceding screen from Zuo Qiang Grid section it is opposite and with it with predetermined gap, the gap provides flue gas damping, with force flue gas pass through it is described before shield the The groove profile segregator is passed through after one light pipe grid section to advance towards the rear first light pipe grid section shielded, rather than bypasses groove profile Separator.

19. boiler as claimed in claim 18, wherein screen has and the described first non-light pipe grid section continuous second after described Light pipe grid section, the second light pipe grid section limit smoke inlet, the smoke inlet than the first light pipe grid section for shielding after described with The engaging portion of first non-light pipe grid section wall after boiler, so that flue gas is impacted by the horizontal flue The smoke inlet is oliquely downward traveled into after wall afterwards.

20. boiler as claimed in claim 19, wherein screen side of wall after the close boiler of the smoke inlet is set after described It is equipped with dust board.

21. boiler as claimed in claim 20, wherein the dust board and boiler Zuo Qiang, right wall are substantially vertical and from Zuo Qiang Extend to You Qiang.

22. boiler as claimed in claim 21, wherein the space after described between screen and the rear wall forms flue dust separation Room, the flue dust separation chamber is for collecting the soot dust granule separated with flue gas.

23. boiler as claimed in claim 22, wherein screen has another light pipe grid section positioned at its lower end after described, Another light pipe grid section provides the dust collecting opening of the flue dust separation chamber.

24. boiler as claimed in claim 23, wherein the lid that the bottom connection one of the dust collecting opening can be opened and closed, or Person connects a comb shape dedusting smoking box, generally comb shape, a row of combs dentation dust discharge with top dust hopper and lower part Pipe, the dust hopper limit dust storage chamber, and the dust flue limits dust discharge access, and the dust storage chamber and the dust discharge access join each other Logical, the comb teeth-shaped dust flue is separated from each other to limit smoke outlet, and the boiler, which has, is set to the comb shape dedusting smoke evacuation Sink below case, dust flue immerse in sink to realize water seal, to work as in use, soot dust granule is via dust collecting opening, comb shape Dust hopper, the dust flue of dedusting smoking box fall to sink.

25. boiler as claimed in claim 24, wherein the dedusting smoking box is the tank body as made of welded steel plate, and Outside siding is equipped with inspection door to be opened/closed.

26. boiler as claimed in claim 24, wherein the comb shape dedusting smoking box is also used as boiler exterior wall.

27. the boiler as described in any one of preceding claims 1-26, wherein the front wall of boiler, Hou Qiang, Zuo Qiang, You Qiang, top Wall wall, preceding screen, rear screen is all membrane wall structure and/or the boiler is grate firing boiler.