CN104018923A

CN104018923A - Marine compact type SCR catalysis silencer

Info

Publication number: CN104018923A
Application number: CN201410210855.7A
Authority: CN
Inventors: 吕若菁; 喻洋
Original assignee: Blue Science And Technology Ltd Co Is Added In Wuhan
Current assignee: Suzhou Tianlan Power Technology Co ltd
Priority date: 2014-05-19
Filing date: 2014-05-19
Publication date: 2014-09-03
Anticipated expiration: 2034-05-19
Also published as: CN104018923B

Abstract

The invention discloses a marine compact SCR catalytic muffler, which integrates the SCR and the muffler, solves the problem of high exhaust back pressure of marine engines, and can realize selective catalytic reduction reaction and exhaust muffler at the same time, saving installation Space and initial installation costs have obvious economic value. The catalyst is packaged in a drawer method, which solves the problem of wear and blockage of the catalyst during operation, thereby prolonging the operation life. At the same time, the inner tube and built-in plate also act as a rectifier, which can not only improve the uniformity of the airflow distribution at the front end of the catalyst, but also effectively prevent the crystallization of urea and the deposition of solid particles in the engine exhaust, so as to achieve the purpose of improving the conversion efficiency ; The exhaust undergoes two sudden expansions and contractions, which can cut most of the low-frequency noise.

Description

Compact type SCR catalytic muffler peculiar to vessel

Technical field

The present invention relates to exhaust gas aftertreatment techniques, concrete is a kind of exhaust gas aftertreatment techniques peculiar to vessel, more precisely a kind of compact type SCR catalytic muffler peculiar to vessel.

Background technique

NO _xbe one of main noxious emission of marine diesel engine, environment and human health are caused to serious harm.IMO (International Maritime Organization) has passed through the protocols in 1997 of " MARPOL73/78 pact " in September, 1997, and has increased supplemental provisions VI " preventing that boats and ships from causing pollution of atmosphere rule " newly, and this rule came into force to China on August 23rd, 2006.In October, 2008, IMO formally passed through the amendment " NO of MARPOL73/78 supplemental provisions VI _xtechnical regulation ", to NO _xdischarge has proposed the limit value requirement of three phases.Control the NO of ship machine _xdischarge to have become and prevent that boats and ships from causing important topic of air-polluting.

Conventionally, marine diesel engine can be realized first stage and second stage emission request by emission controls by improving combustion technology, but the phase III requires to realize the NO of 75% left and right on the basis of second stage _xreduce, depend merely on emission controls by improving combustion and be difficult to meet the demands, the application of the outer control technique of machine has been inevitable.SCR (selective catalytic reduction) technology relies on NO _xthe advantages such as transformation efficiency is high, fuel economy good and applied widely become external control ship machine NO _xthe major programme of discharge.

In vessel motion, exhaust silencer is installed conventionally on diesel exhaust gas pipeline and is reduced and control diesel exhaust noise.Therefore, install SCR catalysis system on existing ship additional, the difficulty that not only can bring space cloth to be set up can cause gas exhaust piping back pressure excessive simultaneously, affects the performance of motor.

In addition, have the problem of wearing and tearing between existing catalyst block and housing, especially more serious in catalyst field wearing and tearing peculiar to vessel, tightness can not ensure preferably like this; Meanwhile, when catalyzer exceedes the whole replacing catalytic muffler of needs service life, so not only cost is too high, has also brought inconvenience to maintenance simultaneously.

Summary of the invention

The problem existing for background technique, the object of the invention is to propose a kind of compact type SCR catalytic muffler peculiar to vessel, and SCR and silencing apparatus are integrated, and solves marine diesel engine noise simultaneously and reduces NO _xthe problem of discharge, and avoided the wearing and tearing between catalyst block and housing, ensure the sealing of gas, and improved the convenience of catalyzer installation and maintenance.

In order to achieve the above object, the compact type SCR catalytic muffler peculiar to vessel of the present invention's design, comprises suction tude, housing, outlet pipe, and described housing two ends are communicated with respectively described suction tude and described outlet pipe; In described housing, be provided with catalyzer; It is characterized in that: between described suction tude and described housing, be connected by diffuser pipe, described diffuser pipe is conical pipe, one end that described diffuser pipe caliber is larger is connected with described housing, and less one end is connected with described suction tude; Between described outlet pipe and described housing, be connected by collapsible tube, described collapsible tube is also conical pipe, and one end that described collapsible tube caliber is larger is connected with described housing, and less one end is connected with described outlet pipe; In described diffuser pipe, be provided with silencer; Described catalyzer is arranged in described housing by package structure; Described package structure comprises the grills that catalyst block is installed, and described catalyst block is placed in the grid of described grills; One of them sidewall of described housing is provided with service port, is provided with the limiting bracket of the described grills of carrying in described housing, and described limiting bracket is positioned at described housing, and all the other are not provided with on the inwall of service port sidewall; Described grills packs in described housing from described service port, is slidably connected with described limiting bracket.

Preferably, the outside of described grills be provided with at least one along the circumferential direction arrange sealing strip; Described service port is passed through cover plate for sealing; Described cover plate one side is provided with protruding terminus, and described protruding terminus surface is provided with the Stamping Steel Ribbon coordinating with described sealing strip, and the sidewall of described protruding terminus is provided with the sealing cord of the described service port of sealing.

Preferably, described grills comprises grills body, in grills body, be provided with catalyst block, described catalyst block is arranged in the grid of described grills body, described grills body two ends are useful on top board and the base plate of the described catalyst block of encapsulation, and described top board and described grills body removably connect.

Preferably, described silencer comprises the interpolation pipe and the built-in plate that are positioned at described diffuser pipe; Described interpolation pipe tube wall is provided with multiple through holes, and described interpolation pipe import is connected with described suction tude outlet; Described built-in plate is provided with multiple through holes, and described built-in plate outer side wall and described diffuser pipe madial wall are tightly connected; Described built-in plate is positioned at described interpolation pipe outlet downstream, and the axis of the vertical described interpolation pipe of described built-in plate.

Further preferred, described interpolation pipe outlet port is provided with the sealing plate that interpolation pipe outlet port can be blocked.Like this, exhaust can only be discharged in the through hole from interpolation pipe, makes all exhausts all through twice contraction and expansion.

As preferred version: be provided with gap between described interpolation pipe outlet and described built-in plate.

So, form a bulging chamber by built-in plate at catalyzer front end, in the time that exhaust enters this bulging chamber, due to the unexpected enlargement and contraction of pipeline section, cause along the noise of pipe transmmision and reflect back to sound source in sudden change place, subdued most low-frequency noise.

Preferably, the length of described interpolation pipe is 1/4～1/2 of described diffuser pipe length.

Preferably, the diameter of the through hole on described interpolation pipe is 1/20～1/10 of outlet pipe internal diameter.

Preferably, the diameter of the through hole on described built-in plate is 1.5～2 times of diameter of the through hole on described interpolation pipe.

Preferably, described built-in plate surface uniform is provided with multiple through holes, and built-in plate surface percent opening is 30%～60%.

Preferably, the material of described sealing strip, Stamping Steel Ribbon and described sealing cord can be teflon or graphite or aramid fibre.

The invention has the beneficial effects as follows: SCR and silencing apparatus are integrated, solve the high problem of marine engine exhaust back pressure, and can realize selective catalytic reduction reaction and exhausting silencer simultaneously, save installing space and just dressed up this, there is obvious economic value.The method encapsulated catalysts that adopts drawer type, has solved wearing and tearing, the blockage problem of catalyzer in running, thereby has extended service life.Simultaneously, interpolation pipe and built-in plate have also played the effect of rectifier, not only can improve the uniformity that catalyzer front end air-flow distributes, can effectively prevent the solid particle deposition in urea crystals and engine exhaust simultaneously, thereby reach the object that improves transformation efficiency; The unexpected enlargement and contraction that exhaust experience is twice, can subdue most low-frequency noise.

Brief description of the drawings

Fig. 1 is perspective view of the present invention, and its middle shell place is sectional view;

Fig. 2 is exploded perspective view of the present invention, and wherein silencer is not shown, and wherein a cover plate has done 90 rotations of spending to clearly express the structure of cover plate;

Fig. 3 is the embodiment's 1 of silencer of the present invention stereochemical structure cross-sectional schematic;

Fig. 4 is silencer embodiment 2 stereochemical structure cross-sectional schematic of the present invention;

Fig. 5 is the embodiment's 3 of silencer of the present invention perspective view;

Fig. 6 is the embodiment's 4 of silencer of the present invention perspective view;

Fig. 7 is the embodiment's 5 of silencer of the present invention perspective view;

In figure: suction tude 1, housing 2, outlet pipe 3, diffuser pipe 4, collapsible tube 5, silencer 6, package structure 7, catalyst block 8, grills 9, sealing strip 10, limiting bracket 11, service port 12, cover plate 13, Stamping Steel Ribbon 14, sealing cord 15, sealing plate 16, interpolation pipe 17, built-in plate 18;

Wherein: grills body 9.1, top board 9.2, base plate 9.3, protruding terminus 13.1.

Embodiment

As depicted in figs. 1 and 2, the compact type SCR catalytic muffler peculiar to vessel of the present invention's design, comprises suction tude 1, housing 2, outlet pipe 3, and described housing 2 two ends are communicated with respectively described suction tude 1 and described outlet pipe 3; In described housing 2, be provided with catalyzer; Between described suction tude 1 and described housing 2, be connected by being provided with diffuser pipe 4, described diffuser pipe 4 is conical pipe, and one end that described diffuser pipe 4 calibers are larger is connected with described housing 2, and less one end is connected with described suction tude 1; Between described outlet pipe 3 and described housing 2, be connected by collapsible tube 5, described collapsible tube 5 is also conical pipe, and one end that described collapsible tube 5 calibers are larger is connected with described housing 2, and less one end is connected with described outlet pipe 3; In described diffuser pipe 4, be provided with silencer 6; Described catalyzer is arranged in described housing 2 by package structure 7; Described package structure 7 comprises the grills 9 that catalyst block 8 is installed, and described catalyst block 8 is placed in the grid of described grills 9, and the outside of described grills 9 is provided with at least one sealing strip 10 along the circumferential direction; In described housing 2, be provided with the limiting bracket 11 of the described grills 9 of carrying.Described housing 2 one of them sidewall are provided with service port 12, and described limiting bracket 11 is positioned on the inwall of described housing 2 all the other sidewalls; Described grills 9 packs in described housing 2 from described service port 12, is slidably connected with described limiting bracket 11; Described service port 12 seals by cover plate 13; Described cover plate 13 1 sides are provided with protruding terminus 13.1, and described protruding terminus 13.1 surfaces are provided with the Stamping Steel Ribbon 14 coordinating with described sealing strip 10, and the sidewall of described protruding terminus 13.1 is provided with the sealing cord 15 of the described service port 12 of sealing.

Again as shown in Figure 2, described grills 9 comprises grills body 9.1, in grills body 9.1, be provided with catalyst block 8, described catalyst block 8 is arranged in the grid of described grills body 9.1, described grills body 9.1 two ends are useful on top board 9.2 and the base plate 9.3 of the described catalyst block 8 of encapsulation, and described top board 9.2 removably connects with described grills body 9.1.

Like this, offer a service port 12 at housing 2 sidewalls, the internal surface of housing 2 its excess-three sidewall arranges limiting bracket 11, thereby has realized the drawer type installation and removal of grills 9, and it is more rapidly convenient to make to safeguard; In order to solve the sealing problem of service port 12, on cover plate 13, design a protruding terminus 13.1, the surface of protruding terminus 13.1 contacts with the sealing strip 10 on grills body 9.1, in order to make the sealability at service port place better, the Stamping Steel Ribbon 14 coordinating with described sealing strip 10 can be set on the surface of protruding terminus 13.1; Sealing cord 15 is set on the sidewall of protruding terminus 13.1, service port 13 is sealed simultaneously.

Preferably, the material of described sealing strip 10,14 and described sealing cord 15 can be teflon or graphite or aramid fibre.

Silencer embodiment 1: as shown in Figure 3, described silencer 6 comprises the interpolation pipe 17 and the built-in plate 18 that are positioned at described diffuser pipe 4; Described interpolation pipe 17 imports are connected with described suction tude 1 outlet, and described interpolation pipe 17 exports with described built-in plate 18 and is connected; On described interpolation pipe 17 tube walls and described built-in plate, be equipped with multiple through holes.Like this, interpolation pipe 17 and built-in plate 18 have played the effect of rectifier, not only can improve the uniformity that catalyzer front end air-flow distributes, can effectively prevent the solid particle deposition in urea crystals and the engine exhaust in catalyst block simultaneously, thereby reach the object that improves transformation efficiency; And, exhaust from the through hole of interpolation pipe 17 enter interpolation pipe 17, built-in plate 18 diffuser pipes 4 form chamber, can form one-level expansion chamber; Enter the chamber of built-in plate 18 and catalyzer formation from the through hole of built-in plate 18 again, form compound expansion chamber; So, experience the unexpected enlargement and contraction of twice, can subdue most low-frequency noise.

Silencer embodiment 2: as shown in Figure 4, be with embodiment 1 difference, set up plate 16 sealing together in the outlet port of interpolation pipe 17.Like this, directly enter the problem the chamber that built-in plate 18 and catalyzer form from the through hole of built-in plate 18 in order to solve part exhaust meeting, thereby improved noise reduction.

Silencer embodiment 3: as shown in Figure 5, described silencer 6 comprises the interpolation pipe 17 and built-in 18 plates that are positioned at described diffuser pipe 4; Described interpolation pipe 17 imports are connected with described suction tude 1 outlet, between described interpolation pipe 17 outlets and described built-in plate 18, are provided with gap, and the axis of the vertical described interpolation pipe 17 of described built-in plate 18; Described built-in plate 18 is provided with multiple through holes, and described built-in plate 18 outer side walls and described diffuser pipe 4 madial walls are tightly connected.Like this, make the sound wave propagated forward and differ from the phase place of 180 ° at the sound wave of the different boundary reflections such as diffuser pipe 4 inwalls, built-in plate 18 surfaces, thereby making that the two amplitude equates, single spin-echo, interfering with each other, reaching desirable soundproof effect; Simultaneously, built-in plate 18 has played the effect of rectifier, not only can improve the uniformity that catalyzer front end air-flow distributes, simultaneously effectively prevent the solid particle deposition in urea crystals and engine exhaust in catalyst block, thereby reach the object of raising transformation efficiency.

Embodiment 4, and as shown in Figure 6, described silencer 6 comprises the interpolation pipe 17 and built-in 18 plates that are positioned at described diffuser pipe 4; Described interpolation pipe 17 imports are connected with described suction tude 1 outlet, between described interpolation pipe 17 outlets and described built-in plate 18, are provided with gap, and the axis of the vertical described interpolation pipe 17 of described built-in plate 18; On described interpolation pipe 17 tube walls and described built-in plate 18, be equipped with multiple through holes; Described interpolation pipe 17 outlet ports are provided with the sealing plate 16 that the above-mentioned interpolation pipe 17 of sealing exports; Described built-in plate 18 outer side walls and described diffuser pipe 4 madial walls are tightly connected.Like this, although reduced sound wave reflection, exhaust must be experienced the unexpected enlargement and contraction of twice, makes like this effect of low-frequency noise be better than the effect in embodiment 3.

Embodiment 5, and as shown in Figure 7, the present embodiment and embodiment's 6 difference is to be evenly equipped with on sealing plate 16 multiple through holes.Like this, increase the total sectional area of exhaust, improved exhaust efficiency.Preferably, the diameter of the upper through hole of described sealing plate 16 equals the diameter of through hole on described interpolation pipe 17 tube walls.

In five mode of executions of above-mentioned silencer, preferred, the cross section of described diffuser pipe 4 and described collapsible tube 5 is rectangle.

In five mode of executions of above-mentioned silencer, preferred, the length of described interpolation pipe 6 is 1/4～1/2 of described diffuser pipe 4 length.

In five mode of executions of above-mentioned silencer, preferred, the diameter of the through hole on described interpolation pipe 6 is 1/20～1/10 of outlet pipe internal diameter.

In five mode of executions of above-mentioned silencer, preferred, the diameter of the through hole on built-in plate 7 is 1.5～2 times of diameter of the through hole on interpolation pipe 6.

In five mode of executions of above-mentioned silencer, preferred, the percent opening of described built-in plate 7 is 30%～60%.

Claims

1. A marine compact SCR catalytic muffler, comprising an intake pipe, a housing, and an exhaust pipe, the two ends of the housing are respectively connected to the intake pipe and the exhaust pipe; the housing is provided with a catalyst; it is characterized in that : The inlet pipe is connected to the housing through a diffuser pipe, the diffuser pipe is a tapered pipe, the larger end of the diffuser pipe diameter is connected to the housing, and the smaller end It is connected with the intake pipe; the exhaust pipe is connected with the housing through a shrink tube, and the shrink tube is also a tapered tube, and the end of the shrink tube with a larger diameter is connected with the housing , the smaller end is connected to the exhaust pipe; the diffuser is provided with a muffler; the catalyst is installed in the housing through a packaging structure; the packaging structure includes a grid frame for installing catalyst blocks, The catalyst block is placed in the grid of the grid frame; one of the side walls of the housing is provided with a maintenance port, and the housing is provided with a limit bracket for carrying the grid frame. The bracket is located on the other inner wall of the housing that is not provided with the side wall of the maintenance opening; the grid frame is loaded into the housing from the maintenance opening, and is slidably connected with the limiting bracket.

2. The marine compact SCR catalytic muffler according to claim 1, characterized in that: the outer side of the grid frame is provided with at least one sealing strip arranged along the circumferential direction; the maintenance port is sealed by a cover plate; the One side of the cover plate is provided with a protruding end, the surface of the protruding end is provided with a sealing strip matched with the sealing belt, and the side wall of the protruding end is provided with a sealing rope for sealing the maintenance opening.

3. The marine compact SCR catalytic muffler according to claim 1, characterized in that: the muffler device includes an inner tube and a built-in plate located in the diffuser tube; the wall of the inner tube is provided with a plurality of Through holes, the inlet of the inner insertion tube is connected with the outlet of the air intake pipe; the built-in plate is provided with a plurality of through holes, and the outer side wall of the built-in plate is sealed and connected with the inner side wall of the diffuser tube; the built-in plate It is located downstream of the outlet of the inner cannula, and the built-in plate is perpendicular to the axis of the inner cannula.

4. The marine compact SCR catalytic muffler according to claim 3, characterized in that: the outlet of the inner insertion pipe is provided with a sealing plate capable of blocking the outlet of the inner insertion pipe.

5. The marine compact SCR catalytic muffler according to claim 3, characterized in that: a gap is provided between the outlet of the inner insertion pipe and the inner plate.

6. The marine compact SCR catalytic muffler according to any one of claims 3-5, wherein the length of the inner insertion pipe is 1/4-1/2 of the length of the diffuser pipe.

7. The marine compact SCR catalytic muffler according to any one of claims 3-5, characterized in that: the diameter of the through hole on the inner insertion pipe is 1/20-1/10 of the inner diameter of the exhaust pipe.

8. The marine compact SCR catalytic muffler according to any one of claims 3-5, characterized in that: the diameter of the through hole on the built-in plate is 1.5 to 2 mm of the diameter of the through hole on the inner insertion tube. times.

9. The marine compact SCR catalytic muffler according to any one of claims 3-5, characterized in that: the surface of the built-in plate is evenly provided with a plurality of through holes, and the surface opening rate of the built-in plate is 30% to 60%.