CN111617635A - Novel denitration reductant directly spout and mix device - Google Patents

Novel denitration reductant directly spout and mix device Download PDF

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Publication number
CN111617635A
CN111617635A CN202010548581.8A CN202010548581A CN111617635A CN 111617635 A CN111617635 A CN 111617635A CN 202010548581 A CN202010548581 A CN 202010548581A CN 111617635 A CN111617635 A CN 111617635A
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China
Prior art keywords
double
nozzle
turbine blade
pipe body
helix
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Pending
Application number
CN202010548581.8A
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Chinese (zh)
Inventor
蒋楠
葛春亮
厉雄峰
钟程鹏
陈乐�
常星岚
邓芙蓉
张力
丁得龙
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Zhejiang Tiandi Environmental Protection Technology Co Ltd
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Zhejiang Tiandi Environmental Protection Technology Co Ltd
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Priority to CN202010548581.8A priority Critical patent/CN111617635A/en
Publication of CN111617635A publication Critical patent/CN111617635A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/90—Injecting reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8631—Processes characterised by a specific device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9431—Processes characterised by a specific device
    • 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
    • F01N3/18—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 methods of operation; Control
    • F01N3/20—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 methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/01—Engine exhaust gases
    • B01D2258/012—Diesel engines and lean burn gasoline engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Biomedical Technology (AREA)
  • Toxicology (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention relates to a novel denitration reducing agent direct injection mixing device, which comprises a mixing pipe body, guide vanes, a nozzle and double-spiral turbine blades, wherein the double-spiral turbine blades are arranged on the mixing pipe body; the nozzle is arranged on the central axis of the mixing pipe body; the guide vane is arranged around the nozzle and is of a horn-shaped structure; the double-helix turbine blade install at the nozzle rear, double-helix turbine blade is along the two helical structure of turning round of air current direction, double-helix turbine blade sets up on mixing tube body central axis, the nozzle connect a horizontal tubule that is used for inputing the atomized particles. The invention has the beneficial effects that: the SCR catalytic converter is provided with the guide vane, the nozzle and the double-helix turbine blade, so that the reducing agent and the tail gas can be fully and uniformly mixed before entering the SCR catalytic converter, the utilization rate of the catalyst is improved, the catalyst is prevented from aging, and meanwhile, the SCR catalytic converter is simple and compact in structure and easy to process and install.

Description

Novel denitration reductant directly spout and mix device
Technical Field
The invention relates to the field of tail gas aftertreatment systems, in particular to a novel denitration reducing agent direct injection mixing device.
Background
As early as 60 s in the last century, NO was recognized in the international societyxThe more stringent NO is established for most developed countries and regions as one of the major atmospheric pollutantsxEmission standard, NO of fixed sources of thermal power plantsxEmission and diesel engine motive source NOxThe emission is one of the key points of atmospheric pollution control in China. Selective Catalytic Reduction (SCR) technology refers to the action of a catalyst with a reducing agent such as NH3、CO、H2NO selective for hydrocarbons, etcxReaction is carried out to reduce the N into nontoxic and harmless N2The method of (1). Although in general small amounts of O will be present in the system2But the reducing agent is selectively reacted with NO by the action of the catalystxA reaction occurs rather than being directly oxidized, and is therefore referred to as selective catalytic reduction. The SCR denitration technology is the denitration technology which is most commercially applied, the technology is the most mature and the denitration efficiency is the highest in the world at present, and has wide application in flue gas denitration of thermal power plants and tail gas denitration of large-scale mobile diesel engines.
A large number of experimental studies show that the mixing degree of the reducing agent and the tail gas has influenceThe efficiency of the SCR catalyst, such as uneven exhaust flow field, tends to cause NOxThe reduced conversion efficiency and increased NH3 slip, and the uneven mixing distribution over time, can also result in uneven catalyst aging, which can affect catalyst life and SCR system performance. In SCR systems, the mixer is raising NH3The mixer promotes the mixing of the reducing agent and tail gas by generating strong vortex and turbulent flow on one hand, improves the gas-liquid mixing uniformity, and is favorable for improving the catalytic conversion efficiency on the other hand.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a novel denitration reducing agent direct-injection mixing device, wherein the nozzle atomized particles and high-speed tail gas are subjected to rapid energy exchange through guide motion of guide vanes of a mixer, and can be preferentially mixed with air flows on two side wall surfaces in the process of being sprayed to the wall surfaces, so that the evaporation process of the atomized particles is accelerated, the particles are prevented from staying and crystallizing on the wall surfaces, then the mixing process of the reducing agent and the tail gas is accelerated under the action of double-spiral turbine blades, and the better uniform mixing is completed before entering an SCR catalyst, so that the conversion rate of nitrogen oxides is improved.
The novel denitration reducing agent direct injection mixing device comprises a mixing pipe body, guide vanes, a nozzle and double-spiral turbine blades; the nozzle is arranged on the central axis of the mixing pipe body; the guide vane is arranged around the nozzle and is of a horn-shaped structure; the double-helix turbine blade is arranged behind the nozzle, is of a twisted double-helix structure along the airflow direction, and is arranged on the central axis of the mixing pipe body.
Preferably, the method comprises the following steps: the nozzle is connected with a transverse tubule used for inputting atomized particles.
Preferably, the method comprises the following steps: the two ends of the mixing pipe body are respectively connected with the front section pipeline and the rear section pipeline through the front end flange and the rear end flange through bolts.
Preferably, the method comprises the following steps: the double-helix turbine blade comprises two sets of turbine blades, the two sets of turbine blades are connected through a connecting steel plate in a welding mode, and two ends of the double-helix turbine blade are connected with the pipe wall through connecting angle steel in a welding mode.
Preferably, the method comprises the following steps: the guide vane piece is provided with a reinforcing rib, and the reinforcing rib extension section is welded on the mixing pipe body.
Preferably, the method comprises the following steps: the mixing pipe body, the guide blades and the double-helix turbine blades are all made of stainless steel.
The invention has the beneficial effects that: the SCR catalytic converter is provided with the guide vane, the nozzle and the double-helix turbine blade, so that the reducing agent and the tail gas can be fully and uniformly mixed before entering the SCR catalytic converter, the utilization rate of the catalyst is improved, the catalyst is prevented from aging, and meanwhile, the SCR catalytic converter is simple and compact in structure and easy to process and install.
Drawings
FIG. 1 is a block diagram of an exhaust system according to the present invention;
FIG. 2 is a front view of the denitration reducing agent direct injection mixing device of the present invention;
FIG. 3 is a side view of the denitration reductant direct injection mixing device of the present invention;
FIG. 4 is a three-dimensional modeling block diagram of a double helix turbine blade of the present invention.
Description of reference numerals: 1. a front end flange; 2. reinforcing ribs; 3. a nozzle; 4. a guide vane; 5. a mixing tube body; 6. connecting angle steel; 7. a double helical turbine blade; 8. connecting steel plates; 9. a rear end flange; 10. a back end pipeline; 11. an SCR catalyst.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
As an example, this patent provides a novel denitration reducing agent directly spouts mixing arrangement, including mixing pipe body 5, guide vane 4, nozzle 3 and double helix turbine blade 7, as shown in fig. 2, 3. The two ends of the mixing pipe body 5 are respectively connected with the front section pipeline and the rear section pipeline 10 through the front end flange 1 and the rear end flange 9 in a bolt mode, and the whole mixing pipe is convenient to install and replace. The nozzle 3 is arranged on the central axis of the mixing tube body, and the guide vane 4 is arranged around the nozzle 3 and is of a trumpet-shaped structure. The guide vane 4 is provided with a reinforcing rib 2 to prevent deformation, and the extending section of the reinforcing rib 2 is welded on the mixing pipe body 5. The double-helix turbine blade 7 is arranged behind the nozzle 3 and consists of two groups of turbine blades, and the turbine blades are in a 180-degree twisted double-helix structure along the airflow direction and are arranged on the central axis of the mixing pipe body. The two groups of turbine blades are welded and connected by a connecting steel plate 8, and the two groups of turbine blades are also welded and connected with the pipe wall by a connecting angle steel 6. The mixing pipe body 5, the guide blades 4, the double-helix turbine blades 7 and the connecting structure are all made of 304 or more stainless steel materials. The rear-stage pipe 10 is connected to an SCR catalyst 11. The guide vanes at the nozzle guide the airflow to the middle and the wall surface, improve the airflow speed, accelerate the transfer of momentum and energy, promote the mixing process of atomized particles and tail gas at the outlet of the nozzle, and then the mixed airflow impacts two groups of turbine blades to further enhance the airflow mixing effect in the rotating process along the curved wall surface of the blades.
As shown in fig. 1, the denitration reducing agent direct injection mixing device in this embodiment reasonably arranges inside the mixer, so that the nozzle atomized particles and the tail gas perform convection type turbulent motion, accelerate the transfer of momentum, heat and energy, accelerate the evaporation of the atomized particles, promote the mixing effect of the reducing agent and the tail gas, complete better uniform mixing before entering the SCR catalyst, and improve the conversion rate of nitrogen oxides. The effect of the method is verified by specially designing simulation software and experiments.

Claims (6)

1. The utility model provides a novel denitration reductant directly spouts mixing arrangement which characterized in that: comprises a mixing pipe body (5), guide blades (4), a nozzle (3) and a double-helix turbine blade (7); the nozzle (3) is arranged on the central axis of the mixing pipe body (5); the guide vane (4) is arranged around the nozzle (3) and has a horn-shaped structure; the double-helix turbine blade (7) is arranged behind the nozzle (3), the double-helix turbine blade (7) is of a twisted double-helix structure along the airflow direction, and the double-helix turbine blade (7) is arranged on the central axis of the mixing pipe body (5).
2. The novel denitration reducing agent direct injection mixing device according to claim 1, characterized in that: the nozzle (3) is connected with a transverse tubule used for inputting atomized particles.
3. The novel denitration reducing agent direct injection mixing device according to claim 1, characterized in that: the two ends of the mixing pipe body (5) are respectively connected with the front section pipeline and the rear section pipeline (10) through the front end flange (1) and the rear end flange (9) through bolts.
4. The novel denitration reducing agent direct injection mixing device according to claim 1, characterized in that: the double-helix turbine blade (7) is composed of two sets of turbine blades, the two sets of turbine blades are connected through a connecting steel plate (8) in a welding mode, and two ends of the double-helix turbine blade (7) are connected with the pipe wall through connecting angle steel (6) in a welding mode respectively.
5. The novel denitration reducing agent direct injection mixing device according to claim 1, characterized in that: and the guide vanes (4) are provided with reinforcing ribs (2), and the extending sections of the reinforcing ribs (2) are welded on the mixing pipe body (5).
6. The novel denitration reducing agent direct injection mixing device according to claim 1, characterized in that: the mixing pipe body (5), the guide blades (4) and the double-spiral turbine blades (7) are all made of stainless steel.
CN202010548581.8A 2020-06-16 2020-06-16 Novel denitration reductant directly spout and mix device Pending CN111617635A (en)

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Application Number Priority Date Filing Date Title
CN202010548581.8A CN111617635A (en) 2020-06-16 2020-06-16 Novel denitration reductant directly spout and mix device

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CN202010548581.8A CN111617635A (en) 2020-06-16 2020-06-16 Novel denitration reductant directly spout and mix device

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CN111617635A true CN111617635A (en) 2020-09-04

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114433001A (en) * 2020-10-31 2022-05-06 中国石油化工股份有限公司 Series high-speed spinning flow gas-liquid mass transfer system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114433001A (en) * 2020-10-31 2022-05-06 中国石油化工股份有限公司 Series high-speed spinning flow gas-liquid mass transfer system
CN114433001B (en) * 2020-10-31 2023-10-10 中国石油化工股份有限公司 Tandem type high-speed spin flow gas-liquid mass transfer system

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