CN115126574A - Boats and ships waste gas denitrification facility - Google Patents
Boats and ships waste gas denitrification facility Download PDFInfo
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- CN115126574A CN115126574A CN202210714800.4A CN202210714800A CN115126574A CN 115126574 A CN115126574 A CN 115126574A CN 202210714800 A CN202210714800 A CN 202210714800A CN 115126574 A CN115126574 A CN 115126574A
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/0232—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles removing incombustible material from a particle filter, e.g. ash
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
- B01F25/4314—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor with helical baffles
- B01F25/43141—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor with helical baffles composed of consecutive sections of helical formed elements
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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
- 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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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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
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
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- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Dispersion Chemistry (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a ship waste gas denitration device, which comprises: the particle collecting and self-cleaning system, the waste gas driving urea solution ejector, the SK-4-90 static mixer, the temperature control catalyst and the discharge pipe are sequentially arranged on the gas conveying pipe, the outlet of the gas conveying pipe is connected with the inlet of the temperature control catalyst, and the outlet of the temperature control catalyst is connected with the discharge pipe. The ship exhaust gas denitration device can realize filtering and self-cleaning of solid particles in the ship exhaust gas, has a good urea solution atomization effect, uniformly mixes and distributes the exhaust gas mixture, and ensures that the catalytic reaction is always in an optimal reaction temperature range.
Description
Technical Field
The invention relates to the field of ship exhaust emission treatment, in particular to a ship exhaust denitration device.
Background
Ships, as important vehicles, bear more than 80% of the total volume of trade logistics worldwide. Most of the ships in active service use diesel engines as power sources, and a large amount of nitrogen oxides (NOx) are generated in the operation process, so that the environmental hazards such as acid rain, photochemical smog and the like are caused, and the life health of human beings is seriously threatened. With the increasing strictness of environmental regulations, various ship waste gas denitration technologies are developed in succession by large ship enterprises. Among them, Selective Catalytic Reduction (SCR) denitration technology has received much attention due to its advantages such as high conversion efficiency and no pollution to emissions. However, nowThe SCR denitration device of the row also has certain problems in the operation process, such as: (1) the ship exhaust gas often contains carbon black and other solid particles, and the carbon black and other solid particles are easily deposited inside SCR catalytic pore channels in the flowing process of the exhaust gas, so that the pore channels are blocked, the backpressure is increased, and the catalytic efficiency is reduced; (2) the urea solution is generally adopted to react with NOx in the catalytic reaction process, the atomization quality of the urea solution directly influences the subsequent catalytic reaction efficiency in the process of injecting the urea solution into a waste gas pipeline through a pipe, and most of the existing urea solution injection equipment is of a pressure type structure, so that the atomization effect is poor, and the adjustment range is small; (3) the urea solution is heated to evaporate and then becomes NH 3 Reaction with nitrogen oxides, NH 3 The mixing effect with the ship exhaust gas directly influences the overall operation efficiency of the catalyst, and the existing denitration device lacks equipment for promoting the mixing of the two; (4) the exhaust gas mixture presents different flow states in the flowing process, and when the flow speed of the exhaust gas mixture is high, the flow state is turbulent flow; when the flow speed of the exhaust gas mixture is slow, the flow state is laminar. Under different flowing state conditions, the distribution uniformity of the exhaust gas mixture in the SCR catalytic pore passage is different, so that the utilization rate of the SCR catalytic pore passage is low, and the integral denitration efficiency of the equipment is influenced; (5) the catalytic reduction reaction needs a certain temperature range, and the optimal reaction temperature is 280-420 ℃. In the existing denitration products, heat loss is generated in the flowing process of ship exhaust gas, the exhaust gas can not enter an SCR catalytic pore channel and is always in an optimal reaction temperature range, and the operation efficiency of a catalytic converter is low.
Disclosure of Invention
The present invention is made to solve the above problems, and an object of the present invention is to provide a novel denitration device for exhaust gas of a ship, which can filter and self-clean solid particles in the exhaust gas of the ship, has a good atomization effect on a urea solution, uniformly mixes and distributes an exhaust gas mixture, and allows a catalytic reaction to be always in an optimal reaction temperature range.
In order to achieve the purpose, the invention adopts the following technical scheme: a marine exhaust gas denitration device, comprising: the particle collecting and self-cleaning system, the waste gas driving urea solution ejector and the SK-4-90 static mixer are sequentially arranged on the gas pipe, an outlet of the gas pipe is connected with an inlet of the temperature control catalyst, and an outlet of the temperature control catalyst is connected with the exhaust pipe.
Further, the particle capture and self-cleaning system comprises: the dust blowing device comprises a filtering unit, a first dust blowing pipe, a second dust blowing pipe, a main pipe first valve, a main pipe second valve, a first dust blowing pipe air inlet valve, a first dust blowing pipe air blowing valve, a second dust blowing pipe exhaust first valve, a second dust blowing pipe exhaust second valve, a dust blowing discharge valve, a first pressure sensor, a dust blowing discharge pipe and a second pressure sensor, wherein the filtering unit is welded in a gas transmission pipe; a second air blowing pipe is arranged on the lower side of the second air conveying pipe, one end of the second air blowing pipe is positioned in front of the filtering unit, a second soot blowing pipe exhaust valve is arranged on one end of the second air blowing pipe, the other end of the second air blowing pipe is positioned behind the filtering unit, a second soot blowing pipe exhaust valve is arranged on the other end of the second air blowing pipe, a soot blowing discharge pipe is arranged in the middle of the second air blowing pipe, and a soot blowing discharge valve is arranged on the soot blowing discharge pipe; one end of the first soot blowing pipe in front of the filtering unit is positioned in front of one end of the second soot blowing pipe, and the other end of the first soot blowing pipe in back of the filtering unit and the other end of the second soot blowing pipe are positioned on the same vertical line; the gas transmission pipe is provided with a main pipe first valve and a main pipe second valve, the main pipe first valve is positioned in front of the filtering unit, and the main pipe first valve is positioned between one end of the first soot blowing pipe and one end of the second soot blowing pipe; the main pipe second valve is positioned behind the filtering unit, and the main pipe second valve is positioned behind the other end of the first ash blowing pipe; first pressure sensor, second pressure sensor all set up on the gas-supply pipe, second pressure sensor is located the place ahead of first soot blowing pipe, first pressure sensor is located the rear of first soot blowing pipe.
Further, the exhaust-driven urea solution injector includes: the device comprises a waste gas injection pipe, a waste gas injection valve, a solution inlet pipe, a spray head, an air compressor and a compressor inlet valve; the waste gas injection valve welds on the waste gas injection pipe, compressor inlet valve welds on the inlet pipeline before the air compressor machine, the waste gas injection pipe advances the pipe with solution and is the bushing structure, and the waste gas injection pipe advances the inside of managing at solution, waste gas injection pipe, solution advance the pipe and all are connected with the shower nozzle.
Further, the showerhead includes: the device comprises a waste gas injection pipe connecting pipe, an atomization sheet, a solution inlet pipe connecting pipe, a nozzle cap, a gasket and threads, wherein the waste gas injection pipe is connected to the inside of the solution inlet pipe connecting pipe in a sleeving manner, one end of the waste gas injection pipe connecting pipe is connected with a waste gas injection pipe, and the other end of the waste gas injection pipe connecting pipe is fixedly connected with the atomization sheet through the threads; one end of the solution inlet pipe connecting pipe is connected with the solution inlet pipe, and the other end of the solution inlet pipe connecting pipe is fixedly connected with the nozzle cap through threads; the nozzle cap includes: the device comprises a nozzle cap wall, a nozzle cap hole and a nozzle cap internal thread, wherein the nozzle cap hole is formed in the nozzle cap wall, the nozzle cap internal thread is formed in the nozzle cap wall, and the nozzle cap internal thread is in threaded connection with a solution inlet pipe connecting pipe; the atomizing piece passes through the threaded fixation on exhaust-gas injection pipe takes over, atomizing piece and solution advance to manage and are equipped with the gasket between taking over, just the atomizing piece runs through nozzle cap hole, the atomizing piece includes: atomizing piece main part, waste gas through-hole, solution through-hole, waste gas compression chamber, atomizing piece internal thread, be equipped with waste gas compression chamber in the atomizing piece main part, waste gas compression chamber takes over through atomizing piece internal thread with the exhaust-gas injection pipe and is connected, be equipped with waste gas through-hole and solution through-hole in the atomizing piece main part, the one end and the solution of solution through-hole advance the pipe and take over and be connected, the other end and the waste gas through-hole of solution through-hole are connected, the one end and the waste gas compression chamber of waste gas through-hole are connected, the other end of waste gas through-hole accesss to the inside of gas-supply pipe.
Furthermore, the SK-4-90 static mixer is formed by sequentially welding a left-handed mixing unit SK-4-90-L and a right-handed mixing unit SK-4-90-R; the left-handed mixing unit SK-4-90-L is formed by welding four fish-shaped mixing pieces which rotate clockwise by 90 degrees; the right-handed mixing unit SK-4-90-R is formed by welding four fish-shaped mixing pieces which rotate 90 degrees counterclockwise; the included angle between the fish-shaped mixing piece of the left-handed mixing unit SK-4-90-L and the fish-shaped mixing piece of the adjacent right-handed mixing unit SK-4-90-R is 45 degrees.
Further, the length L of the fish-shaped mixed slice satisfies:
L＝0.0294·ΔP·D 1.205 ·ρ -0.795 ·v 1.795 ·μ -0.205
wherein, Δ P is the pressure difference of the inlet and the outlet of the mixer, D is the inner diameter of the gas transmission pipe, ρ is the mixing density of the waste gas and the urea droplets, v is the flow velocity of the mixture of the waste gas and the urea droplets, and μ is the mixing viscosity of the waste gas and the urea droplets.
Further, the fish-shaped mixed slice is of a symmetrical structure with thin two ends and thick middle, and the width W of the fish-shaped mixed slice is 0.5D.
Further, the temperature-controlled catalyst includes: the steam heating device comprises an expansion pipe, a steam heating shell, a catalyst supporting pipe, a steam inlet valve, a steam outlet pipe, a first thermometer, a second thermometer, a flowmeter, a switch valve, a distributor support, an SCR catalyst, a collecting pipe, a resistor inlet pipe and a resistor inlet regulating valve, wherein the flowmeter is welded on a gas pipe behind a mixer, the switch valve is welded on the gas pipe behind the flowmeter, the end part of the gas pipe is welded with the expansion pipe, the distributor support is welded at the inlet of the expansion pipe, the distributor is arranged in the distributor support and is connected with a resistor inlet pipe, and the resistor inlet pipe is provided with the resistor inlet regulating valve; the outlet of the expanded pipe is fixedly connected with one end of the catalyst supporting pipe in a welding mode, the other end of the catalyst supporting pipe is fixedly connected with the inlet of the collecting pipe in a welding mode, the other end of the collecting pipe is fixedly connected with the discharge pipe in a welding mode, the expanded pipe is provided with a second thermometer, and the collecting pipe is provided with a first thermometer; the SCR catalyst is arranged inside the catalyst supporting tube, the steam heating shell is wrapped outside the catalyst supporting tube, a steam outlet pipe is arranged at the upper end of the steam heating shell, a steam inlet pipe is arranged at the lower end of the steam heating shell, and a steam inlet valve is arranged on the steam inlet pipe.
Further, the distributor includes: the device comprises a sleeve, a fixed shaft, a fixed nut, blades and a resistor, wherein the sleeve is connected with a distributor support in a welding mode; the fixed shaft penetrates into the sleeve, one end of the fixed shaft is connected through a fixed nut, the other end of the fixed shaft is welded with the blades, and the resistor is arranged on the inner side of the sleeve and is positioned between the sleeve and the fixed shaft; the outer surface of the resistor is fixedly connected with the inner wall of the sleeve, and the resistor is connected with the gas inlet pipe of the resistor.
Further, the steam heating housing includes: the shell comprises a shell side wall, a front baffle and a rear baffle; the front baffle and the rear baffle are welded at two ends of the side wall of the shell; the outer side of the front baffle is welded with the expanding pipe, and the inner side of the front baffle is welded with one end of the catalyst supporting pipe; the inner side of the rear baffle is connected with the other end of the catalyst supporting tube in a welded mode, and the outer side of the rear baffle is connected with the collecting tube in a welded mode.
Compared with the prior art, the invention has the following effects:
(1) according to the particle trapping and self-cleaning system in the novel ship waste gas denitration device, the supplement and filtration of solid particles in the ship waste gas are realized by adopting a forward blowing operation mode, the solid particles deposited in a filter are blown away by adopting a back blowing operation mode, the self-cleaning of a filtering unit is realized, the solid particles blown away by the back blowing operation enter a boiler system through a discharge valve to be combusted, and the zero emission of the solid particles of the denitration device is realized;
(2) according to the waste gas driven urea solution injector in the novel ship waste gas denitration device, the filtered ship waste gas is adopted to perform high-speed high-pressure impact on the urea solution to form dispersed urea droplets with excellent atomization effect, and the pressure and flow of the ship waste gas entering the spray head are adjusted by adjusting the opening degree of the valve behind the air compressor, so that the particle size and distribution effect of the urea atomized droplets can be adjusted;
(3) the SK-4-90 static mixer in the novel ship exhaust gas denitration device consists of a left-handed unit and a right-handed unit, so that the mixed fluid consisting of the ship exhaust gas and urea liquid drops realizes intermittent left-handed rotation and right-handed rotation in the flowing process, and the mixing effect of the mixed fluid is obviously enhanced; the left-handed unit and the right-handed unit are respectively composed of four fish-shaped mixing pieces, so that when the mixed gas flows, the mixed gas is cut into four sub-channels by the mixing pieces, and the mixing effect of the waste gas, urea liquid drops and ammonia gas is enhanced to the maximum extent; meanwhile, the fish-shaped mixing piece is adopted, so that the mixing effect can be enhanced, the resistance in the flowing process can be reduced as much as possible, and the overall power consumption of the device can be reduced;
(4) according to the temperature control catalyst in the novel ship exhaust gas denitration device, the pipe expanding structure adopts the axial flow blades, the distribution uniformity of mixed gas at the catalyst inlet is greatly improved by applying work to the ship exhaust gas and ammonia gas, and the distribution uniformity adjustment of the mixed gas with different flow rates is realized by adjusting the switch of the resistor; the steam heats the shell, and the catalyst part is heated and insulated by adopting steam, so that the catalyst area is always in an optimal temperature window of 280-420 ℃ for the catalytic reduction reaction of nitrogen oxides, and the activity of the catalyst is greatly improved, thereby ensuring that the denitration device has higher denitration efficiency.
Drawings
FIG. 1 is a schematic diagram illustrating a denitration apparatus for exhaust gas of a ship according to the present invention;
FIG. 2 is a structural view of a head of the present invention;
FIG. 3 is a structural view of an atomizing plate according to the present invention;
FIG. 4 is a structural view of a nozzle cap in the present invention, wherein a in FIG. 4 is a sectional view and b in FIG. 4 is an external view;
FIG. 5 is a schematic structural diagram of a left-handed mixing unit SK-4-90-L in the present invention, wherein a in FIG. 5 is a front view, and b in FIG. 5 is a side view;
FIG. 6 is a schematic structural diagram of a right-handed mixing unit SK-4-90-R of the present invention, wherein a in FIG. 6 is a front view and b in FIG. 6 is a side view;
FIG. 7 is a block diagram of a fish mixing slice in a mixer unit of the present invention;
FIG. 8 is a schematic view of the mixer unit of the present invention in a welded position;
FIG. 9 is a sectional view showing a structure of an expanded pipe in the present invention;
FIG. 10 is a schematic view of the configuration of a resistor according to the present invention;
fig. 11 is a structural view of a steam heating cartridge according to the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings.
As shown in fig. 1, the present invention provides a denitration device for exhaust gas of a ship, comprising: the device comprises a gas transmission pipe 1, a particle trapping and self-cleaning system, an exhaust gas driven urea solution ejector, an SK-4-90 static mixer 4, a temperature control catalyst and a discharge pipe 6, wherein the particle trapping and self-cleaning system, the exhaust gas driven urea solution ejector and the SK-4-90 static mixer 4 are sequentially arranged on the gas transmission pipe 1, an outlet of the gas transmission pipe 1 is connected with an inlet of the catalyst, and an outlet of the temperature control catalyst is connected with the discharge pipe 6. The particle trapping and self-cleaning system realizes the trapping of particles in the ship exhaust gas and the self-cleaning of the trapping carrier; the waste gas drives the urea solution injector to atomize the urea solution by using the waste gas, so that the effects of small atomized particle size and uniform distribution of urea liquid drops are realized; the SK-4-90 static mixer 4 can improve the mixing effect of the exhaust gas mixture; the temperature control catalyst improves the distribution uniformity of the exhaust gas mixture in the pore channel of the SCR catalyst, and simultaneously ensures that the catalytic reaction is always in the optimal reaction temperature range. In the invention, the exhaust gas discharged by the marine diesel engine is filtered when passing through a particle trapping and self-cleaning system, then is mixed with urea solution sprayed by an injector, the exhaust gas and the urea solution are mixed in an SK-4-90 static mixer 4 and then enter a temperature control catalytic converter for catalytic reduction reaction, and harmless gas generated after the reaction is discharged into the atmosphere through a discharge pipe 6.
The particle trapping and self-cleaning system of the present invention comprises: the system comprises a filtering unit 21, a first ash blowing pipe 22, a second ash blowing pipe 23, a main pipe first valve 24, a main pipe second valve 25, a first ash blowing pipe air inlet valve 26, a first ash blowing pipe air blowing valve 27, a second ash blowing pipe exhaust first valve 28, a second ash blowing pipe exhaust second valve 29, an ash blowing exhaust valve 210, a first pressure sensor 211, an ash blowing exhaust pipe 212 and a second pressure sensor 213, wherein the filtering unit 21 is welded in the air conveying pipe 1, the first ash blowing pipe 22 is arranged on the upper side of the air conveying pipe 1, one end of the first ash blowing pipe 22 is positioned in front of the filtering unit 21, one end of the first ash blowing pipe 22 is provided with the first ash blowing pipe air inlet valve 26, the other end of the first ash blowing pipe 22 is positioned behind the filtering unit 21, and the other end of the first ash blowing pipe 22 is provided with the first ash blowing valve 27; a second air blowing pipe 23 is arranged at the lower side of the second air conveying pipe 1, one end of the second air blowing pipe 23 is positioned in front of the filtering unit 21, a second ash blowing pipe exhaust first valve 28 is arranged at one end of the second air blowing pipe 23, the other end of the second air blowing pipe 23 is positioned behind the filtering unit 21, a second ash blowing pipe exhaust second valve 29 is arranged at the other end of the second air blowing pipe 23, an ash blowing exhaust pipe 212 is arranged in the middle of the second air blowing pipe 23, and an ash blowing exhaust valve 210 is arranged on the ash blowing exhaust pipe 212; one end of the first soot blowing pipe 22 in front of the filter unit 21 is positioned in front of one end of the second soot blowing pipe 23, and the other end of the first soot blowing pipe 22 in back of the filter unit 21 and the other end of the second soot blowing pipe 23 are positioned on the same vertical line; the gas transmission pipe 1 is provided with a main pipe first valve 24 and a main pipe second valve 25, the main pipe first valve 24 is positioned in front of the filtering unit 21, and the main pipe first valve 24 is positioned between one end of the first soot blowing pipe 22 and one end of the second soot blowing pipe 23; the main pipe second valve 25 is located behind the filtering unit 21, the main pipe second valve 25 is located behind the other end of the first soot blowing pipe 22, the first pressure sensor 211 and the second pressure sensor 213 are both arranged on the gas pipe 1, the second pressure sensor 213 is located in front of the first soot blowing pipe 22, and the first pressure sensor 211 is located behind the first soot blowing pipe 22. The particle trapping and self-cleaning system adopts the arrangement form, so that solid particles in ship waste gas can be effectively removed, periodic back flushing operation can be performed according to the pressure difference of the inlet and the outlet of the filtering unit 21, the self-cleaning effect of the particle filter is realized, the solid particles deposited on the filtering unit 21 enter a boiler system through the soot blowing discharge valve 210, the zero emission of the solid particles of the denitration device is realized, and the denitration device has obvious advantages compared with the existing solution absorption method. When the particle trapping and self-cleaning system works normally, the main pipe first valve 24 and the main pipe second valve 25 are opened, and the ship waste gas enters the particle trapping and self-cleaning system through the gas conveying pipe 1, so that the solid particles in the waste gas are filtered. When the difference Δ P between the second pressure sensor 213 and the first pressure sensor 211 exceeds the maximum pressure difference allowed by the system, it indicates that a sufficient amount of solid particles have been trapped in the trap unit, resulting in an increase in the back pressure of the trap.
At this time, the particle trapping and self-cleaning system 2 needs to be subjected to back-blowing self-cleaning operation, and the specific process is as follows:
step 1: closing the main pipe first valve 24 and the main pipe second valve 25;
and 2, step: opening a first soot blowing pipe air inlet valve 26 and a first soot blowing pipe air inlet valve 27, and enabling waste gas to enter the rear part of the particle trapping and self-cleaning system 2 through the first soot blowing pipe 22;
and step 3: opening the first lance tube exhaust valve 28 and the soot blowing exhaust valve 210, closing the second lance tube exhaust valve 29, allowing the exhaust gas to flow through the particle capture and self-cleaning system 2 for reverse soot blowing, blowing away the solid particles captured in the particle capture and self-cleaning system 2 through the second lance tube 23 and the soot blowing exhaust pipe 212, and allowing the exhaust gas to flow through the exhaust valve 210 to the oil boiler for combustion;
and 4, step 4: part of solid particles are captured by the rear part of the particle capturing and self-cleaning system 2, a first soot blowing pipe air inlet valve 26, a first soot blowing pipe air blowing valve 27 and a second soot blowing pipe air exhaust first valve 28 are closed, a main pipe first valve 24, a second soot blowing pipe air exhaust second valve 29 and a soot blowing exhaust valve 210 are opened, soot is blown in front of the particle capturing and self-cleaning system 2, and the soot-blown waste gas is sent to an oil-fired boiler through the second soot blowing pipe air exhaust second valve 29 and the soot blowing exhaust valve 210 to be combusted;
and 5: checking whether the difference value delta P between the second pressure sensor 213 and the first pressure sensor 211 is lower than the maximum pressure difference allowed by the system, if so, completing soot blowing; otherwise, repeating the steps 1-4.
In the denitration process of the ship exhaust gas, the nitrogen oxide and ammonia gas are subjected to oxidation-reduction reaction to reduce the nitrogen oxide into nitrogen and water. Therefore, the denitration device provided by the invention needs to use the ejector to spray the urea solution into the gas transmission pipe to be mixed with the ship waste gas, the urea solution is evaporated in a high-temperature ship waste gas environment to form ammonia gas, and the nitrogen oxide in the ship waste gas is reduced and replaced. The exhaust gas-driven urea solution injector of the present invention includes: an exhaust gas injection pipe 31, an exhaust gas injection valve 32, a solution inlet pipe 33, a spray head 34, an air compressor 35 and a compressor inlet valve 36; the waste gas injection valve 32 is a flow regulating valve and is welded on the waste gas injection pipe 31, the compressor inlet valve 36 is a switch valve and is welded on a front inlet pipeline of the air compressor 35, the waste gas injection pipe 31 and the solution inlet pipe 33 are of a sleeve structure, the waste gas injection pipe 31 is arranged inside the solution inlet pipe 33, and the waste gas injection pipe 31 and the solution inlet pipe 33 are both connected with the spray head 34.
The urea solution is evaporated to form ammonia gas in a high-temperature environment after entering the gas conveying pipe, and finally the ammonia gas and the nitrogen oxide in the waste gas are subjected to oxidation-reduction reaction. The evaporation rate of the urea solution directly determines the reduction reaction rate of the nitrogen oxides, and ultimately determines the reduction efficiency of the denitration device. Therefore, the ejector provided by the invention adopts the filtered pure ship exhaust gas as an atomization source, mixes the purified ship exhaust gas with the urea solution in the spray head, and sprays the urea solution into the gas conveying pipe 1 under a high pressure condition, so that a good urea solution atomization effect is realized. Moreover, the variable adjustment of the atomization effect of the urea solution can be realized by adjusting the pressure of the ship exhaust gas entering the nozzle area. To achieve this effect, as shown in fig. 2, the head 34 of the present invention includes: the waste gas spraying pipe connecting pipe 341, the atomizing sheet, the solution inlet pipe connecting pipe 343, the nozzle cap 344, the gasket 345 and the thread 346, wherein the waste gas spraying pipe connecting pipe 341 is sleeved inside the solution inlet pipe connecting pipe 343, one end of the waste gas spraying pipe connecting pipe 341 is connected with the waste gas spraying pipe 31, and the other end of the waste gas spraying pipe connecting pipe 341 is fixedly connected with the atomizing sheet through the thread; one end of the solution inlet pipe-connecting pipe 343 is connected to the solution inlet pipe 33, and the other end of the solution inlet pipe-connecting pipe 343 is fixedly connected to the nozzle cap 344 through a screw thread.
The atomization effect of the urea solution has a great relationship with the structure of the atomization sheet. As shown in fig. 3, the atomizing plate structure provided by the present invention includes: the atomizing sheet comprises an atomizing sheet main body 3421, an exhaust gas through hole 3422, a solution through hole 3423, an exhaust gas compression cavity 3424 and an atomizing sheet internal thread 3425, wherein the exhaust gas compression cavity 3424 is arranged in the atomizing sheet main body 3421, the exhaust gas compression cavity 3424 is connected with an exhaust gas injection pipe connecting pipe 341 through the atomizing sheet internal thread 3425, the atomizing sheet main body 3421 is provided with an exhaust gas through hole 3422 and a solution through hole 3423, one end of the solution through hole 3423 is connected with a solution inlet pipe connecting pipe 343, the other end of the solution through hole 3423 is connected with the exhaust gas through hole 3422, one end of the exhaust gas through hole 3422 is connected with the exhaust gas compression cavity 3424, and the other end of the exhaust gas through hole 3422 leads to the inside of the gas conveying pipe 1. The ship exhaust gas enters the nozzle 34 through the exhaust gas injection pipe connection tube 341, passes through the compression cavity 3424 and is then sprayed out through the exhaust gas through hole 3422 in the atomization sheet; the urea solution enters the spray head 34 through the solution inlet pipe 33, enters through the solution through holes 3423 in the atomization sheet, is impacted at high speed by compressed high-pressure waste gas sprayed from the waste gas through holes 3422, forms tiny atomized liquid drops, enters the gas pipe 1, and is mixed with the ship waste gas. The atomized urea liquid drops are evaporated under the high-temperature environment to form ammonia gas, and the nitrogen oxide can be guaranteed to have sufficient reducing agent in the reduction process, so that the reduction reaction is fully carried out, and the efficient operation of the denitration device is guaranteed.
As shown in fig. 4, the nozzle cap 344 includes: the nozzle cap comprises a nozzle cap wall 3441, a nozzle cap hole 3442 and a nozzle cap internal thread 3443, wherein the nozzle cap wall 3441 is provided with the nozzle cap hole 3442, the nozzle cap wall 3441 is internally provided with the nozzle cap internal thread 3443, and the nozzle cap internal thread 3443 is in threaded connection with the solution inlet pipe connecting pipe 343; the atomization plate is fixed on the exhaust gas injection pipe connection pipe 341 through a screw 346, a gasket 345 is arranged between the atomization plate and the solution inlet pipe connection pipe 343, and the atomization plate penetrates through the nozzle cap hole 3442. By adopting the nozzle cap structure, the atomizing sheet can be well fixed, and the atomizing sheet is prevented from shifting and leaking under the condition of high-pressure ship waste gas, so that a stable atomizing effect is realized.
The urea liquid drops sprayed by the sprayer are mixed with the ship exhaust gas, and the urea liquid drops are gradually evaporated to form ammonia gas in the flowing process so as to react with the nitrogen oxides. In this process, the degree of mixing of urea droplets with the ship exhaust gas directly affects the rate at which the redox reaction proceeds, thereby ultimately determining the operating efficiency of the denitration device. Therefore, in order to improve the mixing effect of the urea liquid drops and the ship exhaust gas, as shown in FIGS. 5-8, the invention provides an SK-4-90 static mixer 4, wherein the SK-4-90 static mixer 4 is welded and connected by a left-handed mixing unit SK-4-90-L and a right-handed mixing unit SK-4-90-R in sequence, so that the urea liquid drops flow through the left-handed mixing unit SK-4-90-L and the right-handed mixing unit SK-4-90-R in sequence, and the mixing effect of the urea liquid drops and the ship exhaust gas is further enhanced. The left-handed mixing unit SK-4-90-L is formed by welding four fish-shaped mixing pieces which are clockwise rotated by 90 degrees; the right-handed mixing unit SK-4-90-R is formed by welding four fish-shaped mixing pieces which rotate 90 degrees anticlockwise; the levogyration mixing unit all adopts 4 fish-shaped mixing pieces with dextrorotation mixing unit, can make urea liquid drop and boats and ships waste gas form 4 branches of reposition of redundant personnel at the flow in-process, can guarantee to realize stronger mixed effect, can guarantee again that the flow resistance of mixed fluid at the flow in-process is unlikely to too big. The included angle between the fish-shaped mixing piece of the left-handed mixing unit SK-4-90-L and the fish-shaped mixing piece of the adjacent right-handed mixing unit SK-4-90-R is 45 degrees, and the length L of the fish-shaped mixing piece in the invention meets the following requirements:
L＝0.0294·ΔP·D 1.205 ·ρ -0.795 ·v 1.795 ·μ -0.205
wherein, Δ P is the pressure difference of the inlet and the outlet of the mixer, D is the inner diameter of the gas transmission pipe, ρ is the mixing density of the waste gas and the urea droplets, v is the flow velocity of the mixture of the waste gas and the urea droplets, and μ is the mixing viscosity of the waste gas and the urea droplets.
The fish-shaped mixing piece is of a symmetrical structure with two thin ends and a thick middle part, and the width W of the fish-shaped mixing piece is 0.5D, so that the flow resistance generated by the mixed fluid in the shunting process is minimum, and the running power consumption of equipment is effectively reduced. When the exhaust gas mixture flows through the SK-4-90 static mixer 4, the exhaust gas mixture generates a rotational speed in addition to the axial speed under the guiding action of the fish-shaped mixing pieces, so that secondary flow is generated in a plane perpendicular to the axial direction of the pipeline, and the mixing effect of the mixture can be greatly increased. The waste gas mixture passes through the left-handed unit SK-4-90-L and the right-handed mixing unit SK-4-90-R in sequence, and the mixing effect of the waste gas mixture is further enhanced. Each mixing unit is composed of four fish-shaped mixing pieces, so that the internal space of the pipeline is ensured to have higher utilization rate, and the pressure loss in the flowing process of the waste gas mixture is effectively controlled.
The ammonia gas formed after the urea droplets are evaporated and the ship exhaust gas gradually start to react after passing through the mixer. Because the oxidation-reduction reaction of nitrogen oxides requires high activation energy, the reaction needs to be carried out under the condition of a catalyst to ensure that the nitrogen oxides have high removal efficiency. The catalyst has a certain volume, and in order to make the most full use of the activity of each part of the catalyst, the mixed fluid must be distributed uniformly after entering the catalyst; in addition, a certain temperature window is needed for the catalyst to play a role, and the optimal reaction temperature for the reduction removal reaction of the nitrogen oxides is 280-420 ℃. Therefore, there is also a need for temperature control of the catalytic reactor so that the catalytic reaction is always within this optimal reaction window. In order to achieve the above advantageous effects, the temperature-controlled catalyst 5 of the present invention includes: the system comprises an expanding pipe 51, a steam heating shell 52, a catalyst supporting pipe 53, a steam inlet pipe 54, a steam inlet valve 55, a steam outlet pipe 56, a first thermometer 57, a second thermometer 58, a flow meter 59, a switch valve 510, a distributor 511, a distributor bracket 512, an SCR catalyst 513, a collecting pipe 514, a resistor inlet pipe 515 and a resistor inlet adjusting valve 516, wherein the flow meter 59 is welded on the gas pipe 1 behind a mixer 4 and is used for reading and monitoring the flow of a mixed fluid in real time. An on-off valve 510 is welded to the gas pipe 1 behind the flow meter 59 for controlling the on and off of the distributor 511. The end part of the gas pipe 1 is welded with the expanding pipe 51, the distributor bracket 512 is welded at the inlet of the expanding pipe 51, the distributor bracket 512 is internally provided with a distributor 511 which is an axial flow blade and can make the mixed fluid uniformly distributed at the catalyst inlet by rotation; distributor 511 is connected with resistance ware intake pipe 515, is equipped with resistance ware air inlet regulating valve 516 on the resistance ware intake pipe 515, adjusts gas flow in the resistance ware intake pipe 515 through resistance ware air inlet regulating valve 516 to adjust distributor 511's rotation speed. The outlet of the expanded pipe 51 is fixedly connected with one end of the catalyst supporting pipe 53 in a welding way, the other end of the catalyst supporting pipe 53 is fixedly connected with the inlet of the collecting pipe 514 in a welding way, the other end of the collecting pipe 514 is fixedly connected with the exhaust pipe 6 in a welding way, the expanded pipe 51 is provided with a second thermometer 58, the collecting pipe 514 is provided with a first thermometer 57, and the temperature of the mixed fluid at the inlet of the catalytic converter 5 is monitored through the second thermometer 58; the temperature of the mixed fluid at the outlet of the catalyst 5 is monitored by a first thermometer 57. An SCR catalyst 513 is arranged in the catalyst support tube 53, the steam heating shell 52 is wrapped outside the catalyst support tube 53, a steam outlet tube 56 is arranged at the upper end of the steam heating shell 52, a steam inlet tube 54 is arranged at the lower end of the steam heating shell 52, a steam inlet valve 55 is arranged on the steam inlet tube 54, high-temperature steam enters through the steam inlet tube 54 below the steam heating shell 52 to heat the SCR catalyst 513 in the catalyst support tube 53 and keep the temperature in the optimal reaction temperature interval, and when the temperature of the outlet of the catalyst 5 monitored by a first thermometer 57 is lower than the optimal reaction temperature interval, the air inflow of the high-temperature steam is increased through the steam inlet valve 55, so that the temperature in the catalyst support tube 53 is adjusted to the optimal reaction temperature interval; when the first thermometer 57 detects that the temperature at the outlet of the catalyst 5 is higher than the optimum reaction temperature zone, the steam intake valve 55 is used to reduce the amount of high-temperature steam intake, thereby adjusting the temperature in the catalyst support tube 53 to the optimum reaction temperature zone.
As shown in fig. 10, the distributor 511 of the present invention includes: the distributor comprises a sleeve 5111, a fixed shaft 5112, a fixed nut 5113, blades 5114 and a resistor 5115, wherein the sleeve 5111 is connected with the distributor bracket 512 in a welding mode; the fixed shaft 5112 penetrates into the sleeve 5111, one end of the fixed shaft 5112 is connected through a fixed nut 5113, the other end of the fixed shaft 5112 is welded with the blade 5114, and when the ship exhaust gas mixture enters the expanding pipe 51, the ship exhaust gas mixture can drive the blade 5114 to rotate, so that the ship exhaust gas mixture is uniformly distributed when entering the catalyst support pipe 53; the resistor 5115 is arranged inside the sleeve 5111 and between the sleeve 5111 and the fixed shaft 5112; the outer surface of the resistor 5115 is fixedly connected with the inner wall of the sleeve 5111, and the resistor 5115 is connected with the resistor air inlet pipe 515. When the flow meter 59 monitors that the flow of the ship exhaust gas mixture in the expansion pipe reaches a certain value, the switch valve 510 acts to trigger the action of the air inlet adjusting valve 516 of the resistor on the air inlet pipe 515 of the resistor, so that the flow of the air entering the resistor 5115 from the air inlet pipe of the resistor is changed. When the pressure in the resistor 5115 reaches a certain value, the resistor 5115 completely covers the fixed shaft 5112, and the rotating speed of the blades 5114 is changed by the friction between the resistor 5115 and the fixed shaft 5112, so that the purpose of adjusting the distribution uniformity of different exhaust gas mixture flows is achieved, and the higher distribution uniformity of the exhaust gas mixture flows in the SCR catalytic pore passage is ensured.
As shown in fig. 11, the steam heating case 52 of the present invention includes: a housing sidewall 521, a front baffle 522 and a rear baffle 523; the front baffle 522 and the rear baffle 523 are welded at two ends of the side wall 521 of the shell; the outer side of the front baffle 522 is welded with the expanding pipe 51, and the inner side of the front baffle 522 is welded with one end of the catalyst support pipe 53; the inside of the back plate 523 is welded to the other end of the catalyst support pipe 53, and the outside of the back plate 523 is welded to the header pipe 514.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (10)
1. A ship exhaust gas denitration device is characterized by comprising: gas-supply pipe (1), granule entrapment and automatically cleaning system, exhaust-driven urea solution sprayer, SK-4-90 static mixer (4), control by temperature change catalyst converter and delivery pipe (6), be equipped with granule entrapment and automatically cleaning system, exhaust-driven urea solution sprayer, SK-4-90 static mixer (4) on gas-supply pipe (1) in proper order, the export of gas-supply pipe (1) and the entry linkage of control by temperature change catalyst converter, the export and the delivery pipe (6) of control by temperature change catalyst converter are connected.
2. The marine exhaust gas denitration apparatus according to claim 1, wherein said particle trapping and self-cleaning system comprises: the dust blowing device comprises a filtering unit (21), a first dust blowing pipe (22), a second dust blowing pipe (23), a first valve (24) of the main pipe, a second valve (25) of the main pipe, a first dust blowing pipe air inlet valve (26), a first dust blowing pipe air blowing valve (27), a first valve (28) of the second dust blowing pipe, a second dust blowing pipe air exhaust valve (29), a dust blowing discharge valve (210), a first pressure sensor (211), a dust blowing discharge pipe (212) and a second pressure sensor (213), wherein the filtering unit (21) is welded in a gas pipe (1), the first dust blowing pipe (22) is arranged on the upper side of the gas pipe (1), one end of the first dust blowing pipe (22) is located in front of the filtering unit (21), a first dust blowing pipe air inlet valve (26) is arranged at one end of the first dust blowing pipe (22), and the other end of the first dust blowing pipe (22) is located behind the filtering unit (21), a first ash blowing pipe air blowing valve (27) is arranged at the other end of the first ash blowing pipe (22); a second air blowing pipe (23) is arranged on the lower side of the second air conveying pipe (1), one end of the second air blowing pipe (23) is located in front of the filtering unit (21), a second ash blowing pipe exhaust valve (28) is arranged at one end of the second air blowing pipe (23), the other end of the second air blowing pipe (23) is located behind the filtering unit (21), a second ash blowing pipe exhaust valve (29) is arranged at the other end of the second air blowing pipe (23), an ash blowing discharge pipe (212) is arranged in the middle of the second air blowing pipe (23), and an ash blowing discharge valve (210) is arranged on the ash blowing discharge pipe (212); one end of a first soot blowing pipe (22) in front of the filtering unit (21) is positioned in front of one end of a second soot blowing pipe (23), and the other end of the first soot blowing pipe (22) behind the filtering unit (21) and the other end of the second soot blowing pipe (23) are positioned on the same vertical line; a main pipe first valve (24) and a main pipe second valve (25) are arranged on the gas transmission pipe (1), the main pipe first valve (24) is positioned in front of the filtering unit (21), and the main pipe first valve (24) is positioned between one end of the first soot blowing pipe (22) and one end of the second soot blowing pipe (23); the main pipe second valve (25) is positioned behind the filtering unit (21), and the main pipe second valve (25) is positioned behind the other end of the first ash blowing pipe (22); first pressure sensor (211), second pressure sensor (213) all set up on gas-supply pipe (1), second pressure sensor (213) are located the place ahead of first soot blowing pipe (22), first pressure sensor (211) are located the rear of first soot blowing pipe (22).
3. The marine exhaust gas denitration device according to claim 1, wherein the exhaust gas-driven urea solution injector includes: the device comprises an exhaust gas injection pipe (31), an exhaust gas injection valve (32), a solution inlet pipe (33), a spray head (34), an air compressor (35) and a compressor inlet valve (36); waste gas injection valve (32) welding is on waste gas injection pipe (31), compressor inlet valve (36) welding is on air compressor machine (35) front inlet pipeline, waste gas injection pipe (31) advance pipe (33) with solution and are the bushing structure, and waste gas injection pipe (31) advance the inside of pipe (33) at solution, waste gas injection pipe (31), solution advance pipe (33) and all are connected with shower nozzle (34).
4. The marine exhaust gas denitration apparatus according to claim 3, wherein the shower head (34) includes: the device comprises an exhaust gas injection pipe connecting pipe (341), an atomization sheet, a solution inlet pipe connecting pipe (343), a nozzle cap (344), a gasket (345) and a thread (346), wherein the exhaust gas injection pipe connecting pipe (341) is sleeved inside the solution inlet pipe connecting pipe (343), one end of the exhaust gas injection pipe connecting pipe (341) is connected with an exhaust gas injection pipe (31), and the other end of the exhaust gas injection pipe connecting pipe (341) is fixedly connected with the atomization sheet through the thread; one end of the solution inlet pipe connecting pipe (343) is connected with the solution inlet pipe (33), and the other end of the solution inlet pipe connecting pipe (343) is fixedly connected with the nozzle cap (344) through threads; the nozzle cap (344) includes: the device comprises a nozzle cap wall (3441), a nozzle cap hole (3442) and nozzle cap internal threads (3443), wherein the nozzle cap wall (3441) is provided with the nozzle cap hole (3442), the nozzle cap wall (3441) is internally provided with the nozzle cap internal threads (3443), and the nozzle cap internal threads (3443) are in threaded connection with a solution inlet pipe connecting pipe (343); the atomizing piece is fixed on an exhaust gas injection pipe connecting pipe (341) through a thread (346), a gasket (345) is arranged between the atomizing piece and the solution inlet pipe connecting pipe (343), the atomizing piece penetrates through a nozzle cap hole (3442), and the atomizing piece comprises: the atomizing plate comprises an atomizing plate main body (3421), an exhaust gas through hole (3422), a solution through hole (3423), an exhaust gas compression cavity (3424) and an atomizing plate internal thread (3425), wherein the exhaust gas compression cavity (3424) is arranged in the atomizing plate main body (3421), the exhaust gas compression cavity (3424) is connected with an exhaust gas injection pipe connecting pipe (341) through the atomizing plate internal thread (3425), the atomizing plate main body (3421) is provided with the exhaust gas through hole (3422) and the solution through hole (3423), one end of the solution through hole (3423) is connected with a solution inlet pipe connecting pipe (343), the other end of the solution through hole (3423) is connected with the exhaust gas through hole (3422), one end of the exhaust gas through hole (3422) is connected with the exhaust gas compression cavity (3424), and the other end of the exhaust gas through hole (3422) leads to the inside of the gas conveying pipe (1).
5. The marine exhaust gas denitration device according to claim 1, wherein the SK-4-90 static mixer (4) is welded and connected by a left-handed mixing unit SK-4-90-L and a right-handed mixing unit SK-4-90-R in sequence; the left-handed mixing unit SK-4-90-L is formed by welding four fish-shaped mixing pieces which rotate clockwise by 90 degrees; the right-handed mixing unit SK-4-90-R is formed by welding four fish-shaped mixing pieces which rotate 90 degrees anticlockwise; the included angle between the fish-shaped mixing piece of the left-handed mixing unit SK-4-90-L and the fish-shaped mixing piece of the adjacent right-handed mixing unit SK-4-90-R is 45 degrees.
6. The denitration device for exhaust gas of a ship of claim 5, wherein the length L of the fish-shaped mixing piece satisfies:
L＝0.0294·ΔP·D 1.205 ·ρ -0.795 ·v 1.795 ·μ -0.205
wherein, Δ P is the pressure difference of the inlet and the outlet of the mixer, D is the inner diameter of the gas transmission pipe, ρ is the mixing density of the waste gas and the urea droplets, v is the flow velocity of the mixture of the waste gas and the urea droplets, and μ is the mixing viscosity of the waste gas and the urea droplets.
7. The denitration device for ship exhaust gas according to claim 5, wherein the fish-shaped mixing piece has a symmetrical structure with thin ends and thick middle, and the width W of the fish-shaped mixing piece is 0.5D.
8. The marine exhaust gas denitration device according to claim 1, wherein the temperature-controlled catalyst includes: the steam heating device comprises an expanding pipe (51), a steam heating shell (52), a catalyst supporting pipe (53), a steam inlet pipe (54), a steam inlet valve (55), a steam outlet pipe (56), a first thermometer (57), a second thermometer (58), a flowmeter (59), a switch valve (510), a distributor (511), a distributor bracket (512), an SCR catalyst (513), a collecting pipe (514), a resistor inlet pipe (515) and a resistor inlet regulating valve (516), wherein the flowmeter (59) is welded on a gas pipe (1) behind a mixer (4), the switch valve (510) is welded on the gas pipe (1) behind the flowmeter (59), the end part of the gas pipe (1) is welded with the expanding pipe (51), the distributor bracket (512) is welded at the inlet of the expanding pipe (51), a distributor (511) is arranged in the distributor bracket (512), the distributor (511) is connected with a resistor air inlet pipe (515), and a resistor air inlet regulating valve (516) is arranged on the resistor air inlet pipe (515); the outlet of the expanded pipe (51) is fixedly connected with one end of a catalyst supporting pipe (53) in a welding mode, the other end of the catalyst supporting pipe (53) is fixedly connected with the inlet of a collecting pipe (514) in a welding mode, the other end of the collecting pipe (514) is fixedly connected with a discharge pipe (6) in a welding mode, a second thermometer (58) is arranged on the expanded pipe (51), and a first thermometer (57) is arranged on the collecting pipe (514); the SCR catalyst (513) is arranged in the catalyst supporting tube (53), the steam heating shell (52) is wrapped on the outer side of the catalyst supporting tube (53), a steam outlet tube (56) is arranged at the upper end of the steam heating shell (52), a steam inlet tube (54) is arranged at the lower end of the steam heating shell (52), and a steam inlet valve (55) is arranged on the steam inlet tube (54).
9. The marine exhaust gas denitration apparatus according to claim 8, wherein the distributor (511) comprises: the novel distributor comprises a sleeve (5111), a fixed shaft (5112), a fixed nut (5113), blades (5114) and a resistor (5115), wherein the sleeve (5111) is connected with a distributor bracket (512) in a welding mode; the fixing shaft (5112) penetrates into the sleeve (5111), one end of the fixing shaft (5112) is connected through a fixing nut (5113), the other end of the fixing shaft (5112) is welded with a blade (5114), and the resistor (5115) is arranged on the inner side of the sleeve (5111) and is positioned between the sleeve (5111) and the fixing shaft (5112); the outer surface of resistance ware (5115) and the inner wall fixed connection of sleeve (5111), resistance ware (5115) are connected with resistance ware intake pipe (515).
10. The marine exhaust gas denitration device according to claim 8, wherein the steam heating housing (52) includes: a shell side wall (521), a front baffle (522) and a rear baffle (523); the front baffle (522) and the rear baffle (523) are welded at two ends of the side wall (521) of the shell; the outer side of the front baffle (522) is welded with the pipe expander (51), and the inner side of the front baffle (522) is welded with one end of the catalyst support pipe (53); the inner side of the rear baffle plate (523) is connected with the other end of the catalyst support pipe (53) in a welding mode, and the outer side of the rear baffle plate (523) is connected with the collecting pipe (514) in a welding mode.
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| CN202210714800.4A CN115126574B (en) | 2022-06-23 | 2022-06-23 | Ship exhaust gas denitration device |
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| CN202210714800.4A CN115126574B (en) | 2022-06-23 | 2022-06-23 | Ship exhaust gas denitration device |
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| CN115126574B (en) | 2023-04-25 |
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