CN111577431A - Marine SCR system mixer - Google Patents
Marine SCR system mixer Download PDFInfo
- Publication number
- CN111577431A CN111577431A CN202010389945.2A CN202010389945A CN111577431A CN 111577431 A CN111577431 A CN 111577431A CN 202010389945 A CN202010389945 A CN 202010389945A CN 111577431 A CN111577431 A CN 111577431A
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- China
- Prior art keywords
- spoiler
- scr system
- baffle
- layer
- pipeline
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a marine SCR system mixer, which comprises a cylinder arranged at an inlet of a mixing pipeline, wherein a plurality of layers of partition plates are fixed in the cylinder, the partition plates sequentially comprise an upper layer partition plate, a middle layer partition plate and a lower layer partition plate from top to bottom, the internal space of the cylinder is divided into a multilayer structure by the three layers of partition plates, a plurality of spoilers are arranged on each layer of partition plate at intervals, the spoilers on each layer are arranged in a staggered mode, and hole sites are reserved on the partition plates corresponding to the spoilers. The invention ensures that the waste gas flowing out through the mixer and the reducing agent flowing out from the spray gun in the pipeline are mixed more fully and uniformly in a shorter time, the pyrolysis of the reducing agent is completed in a shorter mixing pipeline, the waste gas flow and the reducing agent achieve better mixing effect, the denitration efficiency of the SCR system is finally improved, and simultaneously the NH is reduced3The escape rate of the mixing pipeline is reduced, the length of the mixing pipeline is shortened, the space of a cabin occupied by the pipeline is reduced, and the cost is reduced.
Description
Technical Field
The invention relates to a gas mixer, in particular to a marine SCR system mixer.
Background
Selective Catalytic Reduction (SCR) is the mainstream technology for treating NOx emission of marine diesel engines, and two important indexes for measuring the performance of an SCR denitration system are denitration efficiency and NH3The escape rate of (2). These two criteria are influenced by a combination of factors, one of which is the degree of uniformity of mixing of NOx and reductant entering the catalyst layer of the SCR reactor. At present, because of the limitation of the mixing effect of the mixer, the gas mixing is realized mainly by lengthening the length of the mixing pipeline, the occupied volume is large, and the cost is high. If the exhaust gas enters the reactor and is not uniformly mixed, NOx in the exhaust gas cannot be fully reduced in an area with low concentration of the reducing agent, so that the desulfurization efficiency is low, and the reducing agent is not fully reacted in an area with high concentration of the reducing agent, so that NH is caused3Thereby degrading the performance of the reactor. Therefore, the thorough mixing of the reducing agent with the exhaust gas before the exhaust gas enters the catalyst layer of the reactor is critical to the performance of the reactor, and the denitration efficiency and NH of the SCR system are directly influenced3The escape rate of (2).
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a marine SCR system mixer which is uniform in gas mixing and low in pressure loss.
The technical scheme is as follows: the invention comprises a cylinder arranged at an inlet of a mixing pipeline, wherein a plurality of layers of partition plates are fixed in the cylinder, the partition plates sequentially comprise an upper layer of partition plate, a middle layer of partition plate and a lower layer of partition plate from top to bottom, the internal space of the cylinder is divided into a multilayer structure by the three layers of partition plates, a plurality of spoilers are arranged on each layer of partition plate at intervals, the spoilers on each layer are arranged in a staggered mode, and hole sites are reserved on the partition plates corresponding to the spoilers.
The spoiler comprises a spoiler windward side and a spoiler leeward side, wherein the spoiler windward side and the spoiler leeward side on each layer of partition plate are respectively distributed at intervals in a staggered manner, so that the layered exhaust gas flow entering the cylinder changes the direction, a high-turbulence intensive mixing area is formed, and then the layered exhaust gas flow is mixed with the reducing agent, and a better mixing effect is achieved.
The included angle between the windward side and the leeward side of the spoiler and the corresponding partition plate is 25-35 degrees.
The clapboard and the cylinder are fixed by welding.
The cylinder is connected with the mixing pipeline through a flange.
The working principle is as follows: the exhaust gas of the diesel engine enters a mixer at the inlet of a mixing pipeline, the exhaust gas flow is divided by the windward side of a spoiler and enters an interlayer formed by each clapboard, part of the gas flow flows out along the reserved hole sites of each clapboard, part of the gas flow flows out along the leeward side of the spoiler, the moving directions of the gas flow are different, a high-turbulence intensive mixing area is formed at the outlet of the mixer, and then the high-turbulence intensive mixing area and the reducing agent flowing out from a spray gun in a pipeline achieve the effect of dispersive mixing.
Has the advantages that: the invention ensures that the waste gas flowing out through the mixer and the reducing agent flowing out from the spray gun in the pipeline are mixed more fully and uniformly in a shorter time, the pyrolysis of the reducing agent is completed in a shorter mixing pipeline, the waste gas flow and the reducing agent achieve better mixing effect, the denitration efficiency of the SCR system is finally improved, and simultaneously the NH is reduced3The escape rate of the mixing pipeline is reduced, the length of the mixing pipeline is shortened, the space of a cabin occupied by the pipeline is reduced, and the cost is reduced.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in figure 1, the invention comprises a cylinder 6, wherein three layers of clapboards are horizontally welded in the cylinder 6 from top to bottom at intervals, and the clapboard comprises an upper layer of clapboard 1, a middle layer of clapboard 2 and a lower layer of clapboard 3. The upper partition plate 1, the middle partition plate 2, the lower partition plate 3 and the cylinder 6 divide the inner space of the mixer into a multilayer structure, so that the exhaust gas flow entering the mixing pipeline is divided into four parallel streams. A plurality of spoilers are uniformly fixed on each layer of partition board at intervals, and hole sites are reserved on the partition boards corresponding to the spoilers. The spoiler comprises a spoiler windward side 4 and a spoiler leeward side 5, wherein the spoiler windward side 4 and the spoiler leeward side 5 are distributed in a V shape in a crossed manner, and the angle between the spoiler windward side 4 and the spoiler leeward side 5 is 25-35 degrees with the corresponding partition plate. The spoilers on each layer of the partition board are distributed in a staggered mode, each layer of the partition board is arranged in a direction different from the windward side 4 of the spoilers and the leeward side 5 of the spoilers to form a structure for changing the direction of air flow, the layered waste gas air flow entering the cylinder 6 changes the direction, a high-turbulence full mixing area is formed, and then the layered waste gas air flow is mixed with the reducing agent, so that a better mixing effect is achieved.
During the use, pass through the flange with drum 6 and mixing line entry and be connected, guarantee that the blender can make waste gas and reductant misce bene before getting into the catalyst layer to the SCR system of different specifications. And then, different waste gas streams in the mixer are guided to flow in different directions according to the arrangement directions of the windward side 4 and the leeward side 5 of the spoiler by arranging the windward side 4 and the leeward side 5 of the spoiler on each layer of partition plates according to different set angles and intervals to form staggered arrangement. Whole blender is cut apart the waste gas of diesel engine emission and is broken up, utilizes the upstream side and leeward side spoiler angle and the not equidirectional exhaust gas motion state that gets into the mixing tube that changes of direction, makes waste gas form the intensive mixing district of high turbulence behind the blender, mixes with the reductant of spray gun again, reaches better mixed effect.
The invention divides the waste gas stream by the mixer, and changes the flow direction of the waste gas stream entering the mixer by the different directional arrangement of the upstream side 4 of the spoiler, the downstream side 5 of the spoiler and the reserved hole positions of the partition plate. Each partition plate structure guides the divided airflow to flow in different directions, and the airflow of different flows is dispersed and mixed with each other between the partition plates to form a high-turbulence fully-mixed area at the outlet of the mixer.
The main propelling power of a certain ship adopts a low-speed diesel engine with the rated power of 13200kW and the rated rotating speed of 111r/min, wherein a cylinder 6 of a mixer is connected with a mixed pipeline with the diameter of 700 phi, the cylinder is arranged at a certain distance from the inlet of the mixed pipeline, and the distance between the cylinder 6 and the inlet of the mixed pipeline is not more than 0.5 time of the pipe diameter of the mixed pipeline. Wherein the distance between the upper, middle and lower layers of the partition boards is 175mm, each layer of the partition board is provided with three spoilers which are arranged from the center to two sides, the distance between the spoilers in the upper and lower layers of the partition boards is 145mm, and the spoilers and the partition board are arranged in an angle of 25 degrees; the interval between the baffle plates of the middle layer baffle plate is 175mm, the baffle plates of the middle layer baffle plate and the baffle plates of the middle layer baffle plate are arranged at an angle of 30 degrees, and the size of each baffle plate is 75mmX125 mm. After the mixer is added to the mixing pipeline entrance, under the effect of the spoiler, the air flow mixing is obviously aggravated, the mixing effect is good, the length of the mixing pipeline is greatly shortened while the requirement of gas-liquid mixing is met, the requirement on the arrangement space of the pipeline is reduced, and the mixing pipeline is convenient and effective.
Claims (5)
1. The utility model provides a marine SCR system blender, its characterized in that, is including installing drum (6) at the mixed pipeline entrance, drum (6) internal fixation have the multilayer baffle, the baffle from last to including upper baffle (1), middle level baffle (2) and lower floor's baffle (3) down in proper order, the multilayer structure is cut apart into with drum (6) inner space to the three-layer baffle, the interval is provided with a plurality of spoilers on every layer of baffle, each layer spoiler staggered arrangement, all reserve the hole site on the baffle that the spoiler corresponds.
2. The marine SCR system mixer of claim 1, wherein the spoilers comprise a spoiler windward side (4) and a spoiler leeward side (5), and the spoiler windward side (4) and the spoiler leeward side (5) of each partition are alternately spaced apart from each other.
3. -SCR system mixer according to claim 2, characterized in that the included angle between the spoiler windward side (4) and spoiler leeward side (5) and the respective partition plate is between 25 ° and 35 °.
4. -marine SCR system mixer according to claim 1, characterised in that said partition is fixed to the cylinder (6) by welding.
5. -marine SCR system mixer according to claim 1, characterised in that the cylinder (6) is flanged to the mixing line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010389945.2A CN111577431A (en) | 2020-05-11 | 2020-05-11 | Marine SCR system mixer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010389945.2A CN111577431A (en) | 2020-05-11 | 2020-05-11 | Marine SCR system mixer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111577431A true CN111577431A (en) | 2020-08-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010389945.2A Pending CN111577431A (en) | 2020-05-11 | 2020-05-11 | Marine SCR system mixer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111577431A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102444451A (en) * | 2011-12-14 | 2012-05-09 | 杭州银轮科技有限公司 | Static mixer for after-treatment system of diesel engine |
| CN104963750A (en) * | 2015-07-07 | 2015-10-07 | 江苏科技大学 | Static mixing device for SCR system of high-power diesel engine |
| CN204755034U (en) * | 2014-06-02 | 2015-11-11 | 卡特彼勒公司 | Blender and quantitative supply system |
| CN105464763A (en) * | 2015-11-19 | 2016-04-06 | 浙江大学 | Urea powerful mixing device for SCR system of small and medium-sized ship |
| CN107476859A (en) * | 2012-08-10 | 2017-12-15 | 天纳克汽车经营有限公司 | Method for mixing exhaust stream |
| CN108843432A (en) * | 2018-07-27 | 2018-11-20 | 江南大学 | A kind of turbulence structure and combined type SCR mixer applied to vent gas treatment |
-
2020
- 2020-05-11 CN CN202010389945.2A patent/CN111577431A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102444451A (en) * | 2011-12-14 | 2012-05-09 | 杭州银轮科技有限公司 | Static mixer for after-treatment system of diesel engine |
| CN107476859A (en) * | 2012-08-10 | 2017-12-15 | 天纳克汽车经营有限公司 | Method for mixing exhaust stream |
| CN204755034U (en) * | 2014-06-02 | 2015-11-11 | 卡特彼勒公司 | Blender and quantitative supply system |
| CN104963750A (en) * | 2015-07-07 | 2015-10-07 | 江苏科技大学 | Static mixing device for SCR system of high-power diesel engine |
| CN105464763A (en) * | 2015-11-19 | 2016-04-06 | 浙江大学 | Urea powerful mixing device for SCR system of small and medium-sized ship |
| CN108843432A (en) * | 2018-07-27 | 2018-11-20 | 江南大学 | A kind of turbulence structure and combined type SCR mixer applied to vent gas treatment |
Non-Patent Citations (1)
| Title |
|---|
| 黄楚南: "船舶低速柴油机高压SCR系统结构优化及数值模拟", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
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Application publication date: 20200825 |
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| RJ01 | Rejection of invention patent application after publication |