CN115126574B - Ship exhaust gas denitration device - Google Patents
Ship exhaust gas denitration device Download PDFInfo
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- CN115126574B CN115126574B CN202210714800.4A CN202210714800A CN115126574B CN 115126574 B CN115126574 B CN 115126574B CN 202210714800 A CN202210714800 A CN 202210714800A CN 115126574 B CN115126574 B CN 115126574B
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- pipe
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- ash blowing
- inlet
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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
Abstract
The invention discloses a ship waste gas denitration device, which comprises: the exhaust gas temperature control device comprises a gas pipe, a particle capturing and self-cleaning system, an exhaust gas driven urea solution injector, an SK-4-90 static mixer, a temperature control catalyst and a discharge pipe, wherein the gas pipe is sequentially provided with the particle capturing and self-cleaning system, the exhaust gas driven urea solution injector and the SK-4-90 static mixer, 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 discharge pipe. The ship exhaust gas denitration device can realize the filtration and self-cleaning of solid particles in ship exhaust gas, has good urea solution atomization effect, uniformly mixes and distributes exhaust gas mixtures, 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
The ship is an important carrier and bears more than 80% of the total global trade logistics. The active ships mostly use diesel engines as power sources, and a large amount of nitrogen oxides (NOx) are generated in the operation process, so that the active ships not only cause environmental hazards such as acid rain, photochemical smog and the like, but also seriously threaten the life and health of human beings. With the increasing severity of environmental regulations, various ship exhaust gas denitration technologies are developed by each large ship enterprise successively. Among them, the Selective Catalytic Reduction (SCR) denitration technology has received a great deal of attention because of advantages such as high conversion efficiency, pollution-free emission, etc. However, the existing SCR denitration device also has certain problems in the operation process, for example: (1) Solid particles such as carbon black are often contained in ship exhaust gas, and are easy to deposit inside SCR catalytic pore channels along with the flowing process of the exhaust gas, so that the pore channels are blocked, and the backpressure is increased, and the catalytic efficiency is reduced; (2) In the catalytic reaction process, urea solution is usually adopted to react with NOx, and in the process of injecting the urea solution into an exhaust gas pipeline through a pipeline, the atomization quality directly influences the subsequent catalytic reaction efficiency, while 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 and evaporated to become NH 3 React with nitrogen oxides, NH 3 The mixing effect with ship exhaust gas directly affects the overall operation efficiency of the catalyst, but the existing denitration device is lackA device to facilitate mixing of the two; (4) The exhaust gas mixture shows different flowing states in the flowing process, and when the flowing speed of the exhaust gas mixture is high, the flowing state is turbulent; when the flow speed of the exhaust gas mixture is slow, the flow state is laminar. Under different flow state conditions, the distribution uniformity of the exhaust gas mixture in the SCR catalytic pore canal is different, so that the utilization rate of the SCR catalytic pore canal is not high, and the integral denitration efficiency of the equipment is affected; (5) The catalytic reduction reaction needs a certain temperature interval, and the optimal reaction temperature is 280-420 ℃. In the existing denitration products, heat loss is generated in the flowing process of ship waste gas, and the condition that the waste gas enters the SCR catalytic pore canal and is always in an optimal reaction temperature range cannot be guaranteed, so that the operation efficiency of the catalyst is low.
Disclosure of Invention
The invention is proposed to solve the above problems, and an object of the invention is to provide a novel ship exhaust gas denitration device, which can realize the filtration and self-cleaning of solid particles in ship exhaust gas, has good atomization effect on urea solution, uniformly mixes and distributes exhaust gas mixture, and enables catalytic reaction to be always in an optimal reaction temperature range.
In order to achieve the above purpose, the invention adopts the following technical scheme: a marine exhaust gas denitration device, comprising: the exhaust gas temperature control device comprises a gas transmission pipe, a particle capturing and self-cleaning system, an exhaust gas driven urea solution injector, an SK-4-90 static mixer, a temperature control catalyst and a discharge pipe, wherein the gas transmission pipe is sequentially provided with the particle capturing and self-cleaning system, the exhaust gas driven urea solution injector and the SK-4-90 static mixer, an outlet of the gas transmission pipe is connected with an inlet of the temperature control catalyst, and an outlet of the temperature control catalyst is connected with the discharge pipe.
Further, the particle trapping and self-cleaning system comprises: the device comprises a filtering unit, a first ash blowing pipe, a second ash blowing pipe, a main pipe first valve, a main pipe second valve, a first ash blowing pipe air inlet valve, a second ash blowing pipe air outlet valve, a soot blowing discharge valve, a first pressure sensor, a soot blowing discharge pipe and a second pressure sensor, wherein the filtering unit is welded in a gas transmission pipe, the upper side of the gas transmission pipe is provided with the first ash blowing pipe, one end of the first ash blowing pipe is positioned in front of the filtering unit, one end of the first ash blowing pipe is provided with the first ash blowing pipe air inlet valve, the other end of the first ash blowing pipe is positioned behind the filtering unit, and the other end of the first ash blowing pipe is provided with the first ash blowing pipe air inlet valve; the lower side of the second gas pipe is provided with a second gas blowing pipe, one end of the second gas blowing pipe is positioned in front of the filtering unit, one end of the second gas blowing pipe is provided with a second soot blowing pipe exhaust valve, the other end of the second gas blowing pipe is positioned behind the filtering unit, the other end of the second gas blowing pipe is provided with a second soot blowing pipe exhaust valve, the middle part of the second gas blowing pipe is provided with a soot blowing exhaust pipe, and the soot blowing exhaust pipe is provided with a soot blowing exhaust valve; one end of a first ash blowing pipe in front of the filtering unit is positioned in front of one end of a second ash blowing pipe, and the other end of the first ash blowing pipe behind the filtering unit and the other end of the second ash blowing pipe are positioned on the same vertical line; the gas 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 ash blowing pipe and one end of the second ash blowing pipe; the main pipe second valve is positioned at the rear of the filtering unit, and the main pipe second valve is positioned at the rear of the other end of the first ash blowing pipe; the first pressure sensor and the second pressure sensor are both arranged on the gas pipe, the second pressure sensor is positioned in front of the first ash blowing pipe, and the first pressure sensor is positioned behind the first ash blowing pipe.
Further, the exhaust gas driven urea solution injector comprises: the device comprises an exhaust gas injection pipe, an exhaust gas injection valve, a solution inlet pipe, a spray head, an air compressor and a compressor inlet valve; the exhaust gas injection valve is welded on the exhaust gas injection pipe, the compressor inlet valve is welded on the front inlet pipeline of the air compressor, the exhaust gas injection pipe and the solution inlet pipe are of a sleeve structure, the exhaust gas injection pipe is arranged in the solution inlet pipe, and the exhaust gas injection pipe and the solution inlet pipe are connected with the spray head.
Further, the spray head includes: the device comprises an exhaust gas injection pipe connecting pipe, an atomization sheet, a solution inlet pipe connecting pipe, a nozzle cap, a gasket and threads, wherein the exhaust gas injection pipe connecting pipe is sleeved in the solution inlet pipe connecting pipe, one end of the exhaust gas injection pipe connecting pipe is connected with the exhaust gas injection pipe, and the other end of the exhaust 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 wall is provided with the nozzle cap hole, the nozzle cap internal thread is arranged in the nozzle cap wall, and the nozzle cap internal thread is in threaded connection with a solution inlet pipe; the atomizing piece is fixed on waste gas injection pipe takeover through the screw thread, be equipped with the gasket between atomizing piece and the solution advances the pipe takeover, just the atomizing piece runs through the nozzle cap hole, the atomizing piece includes: the atomizing piece main part, waste gas through-hole, solution through-hole, waste gas compression chamber, atomizing piece internal screw thread, be equipped with the waste gas compression chamber in the atomizing piece main part, waste gas compression chamber and waste gas injection pipe take over through atomizing piece internal screw thread connection, be equipped with waste gas through-hole and solution through-hole in the atomizing piece main part, solution through-hole's one end and solution advance pipe union coupling, solution through-hole's the other end and waste gas through-hole are connected, waste gas through-hole's one end and waste gas compression chamber are connected, waste gas through-hole's the other end accesss to the inside of gas-supply pipe.
Further, the SK-4-90 static mixer is sequentially welded and connected by 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 plates after clockwise rotating for 90 degrees; the right-handed mixing unit SK-4-90-R is formed by welding four fish-shaped mixing plates after rotating anticlockwise by 90 degrees; 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 mixing piece satisfies:
L＝0.0294·ΔP·D 1.205 ·ρ -0.795 ·v 1.795 ·μ -0.205
wherein DeltaP is the pressure difference of an inlet and an 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 liquid drops, v is the flow velocity of the mixture of the waste gas and the urea liquid drops, and μ is the mixing viscosity of the waste gas and the urea liquid drops.
Further, the fish-shaped mixing piece is of a symmetrical structure with thin ends and thick middle, and the width w=0.5d of the fish-shaped mixing piece.
Further, the temperature-controlled catalyst includes: the device comprises an expanding 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 bracket, 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 outlet of the expanding pipe is fixedly connected with one end of a catalyst supporting pipe in a welding way, the other end of the catalyst supporting pipe is fixedly connected with the inlet of a collecting pipe in a welding way, the other end of the collecting pipe is fixedly connected with a discharge pipe in a welding way, a second thermometer is arranged on the expanding pipe, and a first thermometer is arranged on the collecting pipe; the inside of catalyst stay tube is equipped with the SCR catalyst, the outside parcel steam heating casing of catalyst stay tube, the upper end of steam heating casing is equipped with the steam outlet duct, the lower extreme of steam heating casing is equipped with the steam intake pipe, be equipped with steam air inlet valve in the steam intake pipe.
Further, the distributor includes: the device comprises a sleeve, a fixed shaft, a fixed nut, a blade and a resistor, wherein the sleeve is connected with a distributor bracket 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 a blade, 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 a resistor air inlet pipe.
Further, the steam heating housing includes: 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 expander, and the inner side of the front baffle is welded with one end of the catalyst supporting tube; the inner side of the rear baffle is welded with the other end of the catalyst supporting tube, and the outer side of the rear baffle is welded with the collecting pipe.
Compared with the prior art, the invention has the following advantages:
(1) The particle trapping and self-cleaning system in the novel ship exhaust gas denitration device realizes the complement and filtration of solid particles in ship exhaust gas by adopting a forward blowing operation mode, blows away the solid particles deposited in the filter by adopting a reverse blowing operation mode, realizes the self-cleaning of a filtration unit, and realizes the zero emission of the solid particles of the denitration device by enabling the solid particles blown away by the reverse blowing operation to enter a boiler system for combustion through a discharge valve;
(2) According to the novel ship waste gas denitration device, the waste gas drives the urea solution injector, the filtered ship waste gas is adopted to perform high-speed high-pressure impact on the urea solution, dispersed urea liquid drops with excellent atomization effect are formed, and the pressure and flow of the ship waste gas entering a spray head are adjusted by adjusting the opening of a valve behind an air compressor, so that the particle size and the distribution effect of the urea atomized liquid drops can be adjusted;
(3) The SK-4-90 static mixer in the novel ship waste gas denitration device is composed of the left-handed unit and the right-handed unit, so that mixed fluid composed of ship waste gas and urea liquid drops realizes intermittent left-handed and right-handed 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 mixed gas flows, the mixed gas is cut into four sub-channels by the mixing pieces, and the mixing effect of waste gas, urea liquid drops and ammonia gas is enhanced to the greatest extent; meanwhile, the fish-shaped mixing piece is adopted, so that the resistance in the flowing process can be reduced as much as possible while the mixing effect is enhanced, and the overall power consumption of the device is reduced;
(4) According to the temperature control catalyst in the novel ship exhaust gas denitration device, the tube expansion structure adopts the axial flow blades, so that the distribution uniformity of mixed gas at a catalyst inlet is greatly improved by doing work on ship exhaust gas and ammonia, and the distribution uniformity adjustment of mixed gas with different flow rates is realized by adjusting a resistor switch; the steam heating shell is used for heating and preserving heat of the catalyst part by adopting steam, so that the catalyst area is always in an optimal temperature window 280-420 ℃ for the catalytic reduction reaction of nitrogen oxides, the activity of the catalyst is greatly improved, and the denitration device is ensured to have higher denitration efficiency.
Drawings
FIG. 1 is a schematic diagram of a ship exhaust gas denitration device according to the present invention;
FIG. 2 is a block diagram of a sprinkler head according to the present invention;
FIG. 3 is a block diagram of an atomizer plate according to the present invention;
fig. 4 is a structural view of a nozzle cap according to 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 diagram of the structure of the left-hand mixing unit SK-4-90-L in the invention, wherein a in FIG. 5 is a front view, and b in FIG. 5 is a side view;
FIG. 6 is a schematic diagram of the structure of the dextrorotatory mixing unit SK-4-90-R of the 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-shaped mixing blade in a mixer unit according to the invention;
FIG. 8 is a schematic view of the mixer unit of the present invention in position during welding;
FIG. 9 is a cross-sectional view of the structure of the expanded pipe of the present invention;
FIG. 10 is a schematic diagram of the construction of the resistor of 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 below with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides a ship exhaust gas denitration device, comprising: the exhaust gas purification device comprises a gas pipe 1, a particle capturing and self-cleaning system, an exhaust gas driven urea solution injector, an SK-4-90 static mixer 4 and a temperature control catalyst and discharge pipe 6, wherein the particle capturing and self-cleaning system, the exhaust gas driven urea solution injector and the SK-4-90 static mixer 4 are sequentially arranged on the gas pipe 1, an outlet of the gas 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 provided by the invention can be used for trapping particles in ship exhaust gas and automatically cleaning trapping carriers; the waste gas drives the urea solution injector to atomize the urea solution by adopting the waste gas, so that the effect of small atomized particle size and uniform distribution of urea liquid drops is realized; the SK-4-90 static mixer 4 can improve the mixing effect of the exhaust gas mixture; the temperature control catalyst not only improves the distribution uniformity of the exhaust gas mixture in the pore canal of the SCR catalyst, but also ensures that the catalytic reaction is always in the optimal reaction temperature range. In the invention, exhaust gas discharged by a marine diesel engine is filtered when passing through a particle capturing and self-cleaning system, and then is mixed with urea solution sprayed by an ejector, the exhaust gas and urea solution are mixed in an SK-4-90 static mixer 4 and enter a temperature control catalyst 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 invention comprises: the device comprises a filter 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 valve 27, a second ash blowing pipe air outlet valve 28, a second ash blowing pipe air outlet valve 29, a soot blowing outlet valve 210, a first pressure sensor 211, a soot blowing outlet pipe 212 and a second pressure sensor 213, wherein the filter unit 21 is welded in the gas pipe 1, the first ash blowing pipe 22 is arranged on the upper side of the gas pipe 1, one end of the first ash blowing pipe 22 is positioned in front of the filter unit 21, a first ash blowing pipe air inlet valve 26 is arranged on one end of the first ash blowing pipe 22, the other end of the first ash blowing pipe 22 is positioned behind the filter unit 21, and a first ash blowing pipe air valve 27 is arranged on the other end of the first ash blowing pipe 22; the lower side of the second gas pipe 1 is provided with a second gas blowing pipe 23, one end of the second gas blowing pipe 23 is positioned in front of the filter unit 21, one end of the second gas blowing pipe 23 is provided with a second soot blowing pipe exhaust valve 28, the other end of the second gas blowing pipe 23 is positioned behind the filter unit 21, the other end of the second gas blowing pipe 23 is provided with a second soot blowing pipe exhaust valve 29, the middle part of the second gas blowing pipe 23 is provided with a soot blowing exhaust pipe 212, and the soot blowing exhaust pipe 212 is provided with a soot blowing exhaust valve 210; one end of the first ash blowing pipe 22 in front of the filter unit 21 is positioned in front of one end of the second ash blowing pipe 23, and the other end of the first ash blowing pipe 22 behind the filter unit 21 and the other end of the second ash blowing pipe 23 are positioned on the same vertical line; the gas 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 ash blowing pipe 22 and one end of the second ash blowing pipe 23; the main pipe second valve 25 is located at the rear of the filtering unit 21, the main pipe second valve 25 is located at the rear of the other end of the first ash 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 at the front of the first ash pipe 22, and the first pressure sensor 211 is located at the rear of the first ash pipe 22. The particle capturing and self-cleaning system in the invention adopts the arrangement form, not only can effectively remove solid particles in the ship exhaust gas, but also can perform periodical back blowing operation according to the pressure difference between the inlet and the outlet of the filtering unit 21, so as to realize the self-cleaning function of the particle filter, enable the solid particles deposited on the filtering unit 21 to enter the boiler system after passing through the soot blowing discharge valve 210, realize the zero discharge of the solid particles of the denitration device, and have obvious advantages compared with the current solution absorption method. When the particle capturing 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 capturing and self-cleaning system through the gas pipe 1, so that the filtering of solid particles in the waste gas is realized. When the difference Δp between the second pressure sensor 213 and the first pressure sensor 211 exceeds the maximum pressure differential allowed by the system, it is indicated that a sufficient amount of solid particles have been captured in the trap unit, resulting in an increase in the back pressure of the trap.
At this time, the particle capturing 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;
step 2: opening a first ash blowing pipe air inlet valve 26 and a first ash blowing pipe air outlet valve 27, and allowing waste gas to enter the rear of the particle capturing and self-cleaning system 2 through the first ash blowing pipe 22;
step 3: opening a second lance tube exhaust valve 28 and a soot blowing discharge valve 210, closing a second lance tube exhaust valve 29, allowing exhaust gas to flow through the particle trap and self-cleaning system 2 for alignment for reverse soot blowing, allowing solid particles trapped in the particle trap and self-cleaning system 2 to blow away through the second lance tube 23 and the soot blowing discharge valve 212, and allowing the exhaust gas to pass through the discharge valve 210 to a fuel boiler for combustion;
step 4: part of solid particles are captured by the rear part of the particle capturing and self-cleaning system 2, a first blow pipe air inlet valve 26, a first blow pipe air outlet valve 27 and a second blow pipe air outlet valve 28 are closed, a main pipe first valve 24, a second blow pipe air outlet valve 29 and a soot blowing discharge valve 210 are opened, waste gas is blown in front of the particle capturing and self-cleaning system 2, and the blown waste gas is blown to a fuel boiler for combustion through the second blow pipe air outlet valve 29 and the soot blowing discharge valve 210;
step 5: checking whether the difference 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, blowing is completed; otherwise, repeating the steps 1-4.
Because the denitration process of the ship exhaust gas mainly carries out oxidation-reduction reaction on nitrogen oxides and ammonia gas, and reduces the nitrogen oxides into nitrogen and water. Therefore, the denitration device provided by the invention needs to use the ejector to spray urea solution into the gas transmission pipe to be mixed with ship waste gas, the urea solution is evaporated in a high-temperature ship waste gas environment to form ammonia gas, and nitrogen oxides in the ship waste gas are reduced and replaced. The exhaust gas driven urea solution injector of the present invention 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; the exhaust gas injection valve 32 is a flow regulating valve, and is welded on the exhaust gas injection pipe 31, the compressor inlet valve 36 is a switch valve, and is welded on the front inlet pipeline of the air compressor 35, the exhaust gas injection pipe 31 and the solution inlet pipe 33 are of a sleeve structure, the exhaust gas injection pipe 31 is arranged in the solution inlet pipe 33, and the exhaust gas injection pipe 31 and the solution inlet pipe 33 are connected with the spray head 34.
The urea solution enters the gas pipe and is evaporated to form ammonia in a high-temperature environment, and finally the ammonia and nitrogen oxides in the waste gas undergo oxidation-reduction reaction. The evaporation rate of the urea solution directly determines the reduction reaction rate of the nitrogen oxides and finally determines the reduction efficiency of the denitration device. Therefore, the pure ship waste gas after filtration is used as an atomization source and is mixed with urea solution in the spray head, and the urea solution is sprayed into the gas pipe 1 under high pressure, so that a good urea solution atomization effect is realized. Moreover, by adjusting the pressure of the ship exhaust gas entering the spray head area, variable adjustment of the atomization effect of the urea solution can be achieved. To achieve this, as shown in fig. 2, the shower head 34 of the present invention 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 threads 346, wherein the exhaust gas injection pipe connecting pipe 341 is sleeved in the solution inlet pipe connecting pipe 343, one end of the exhaust gas injection pipe connecting pipe 341 is connected with the 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 threads; one end of the solution inlet pipe connection pipe 343 is connected with the solution inlet pipe 33, and the other end of the solution inlet pipe connection pipe 343 is fixedly connected with the nozzle cap 344 through threads.
The atomization effect of urea solution has a great relationship with the structure of the atomization sheet. As shown in fig. 3, the atomizing sheet structure provided by the present invention includes: 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 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 is led into the gas transmission pipe 1. The ship waste gas enters the spray head 34 through the waste gas injection pipe connecting pipe 341, passes through the compression cavity 3424 and is sprayed out through the waste gas through holes 3422 in the atomization sheet; the urea solution enters the spray head 34 through the solution inlet pipe 33, enters through the solution through hole 3423 in the atomization sheet, is impacted by compressed high-pressure waste gas sprayed out of the waste gas through hole 3422 at a high speed, and forms tiny atomized liquid drops to enter the gas transmission pipe 1 to be mixed with ship waste gas. The atomized urea liquid drops are evaporated in a high-temperature environment to form ammonia gas, so that the nitrogen oxides can be guaranteed to have sufficient reducing agents in the reduction process, the reduction reaction is ensured to be sufficiently carried out, and the high-efficiency operation of the denitration device is ensured.
As shown in fig. 4, 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 343; the atomizing plate is fixed to the exhaust gas injection pipe connection tube 341 by screw 346, a spacer 345 is provided between the atomizing plate and the solution inlet pipe connection tube 343, and the atomizing plate penetrates through the nozzle cap hole 3442. By adopting the nozzle cap structure, a better fixing effect can be realized on the atomizing sheet, and the atomizing sheet is ensured not to deviate and leak under the condition of high-pressure ship waste gas, so that a stable atomizing effect is realized.
Urea liquid drops sprayed by the sprayer are mixed with ship waste gas, and the urea liquid drops gradually evaporate to form ammonia gas in the flowing process, so that the ammonia gas reacts with nitrogen oxides. In the process, the mixing degree of urea liquid drops and ship exhaust gas directly influences the speed of oxidation-reduction reaction, so that the operation efficiency of the denitration device is finally determined. Therefore, in order to improve the mixing effect of urea droplets and ship exhaust gas, as shown in fig. 5-8, the invention provides an SK-4-90 static mixer 4, wherein the SK-4-90 static mixer 4 is sequentially welded and connected by a left-handed mixing unit SK-4-90-L and a right-handed mixing unit SK-4-90-R, so that the flow sequentially passes through the left-handed mixing unit SK-4-90-L and the right-handed mixing unit SK-4-90-R, and the mixing effect of urea droplets and ship exhaust gas is further improved. The left-hand mixing unit SK-4-90-L is formed by welding four fish-shaped mixing plates after clockwise rotation for 90 degrees; the right-handed mixing unit SK-4-90-R is formed by welding four fish-shaped mixing plates after rotating anticlockwise by 90 degrees; the left-handed mixing unit and the right-handed mixing unit both adopt 4 fish-shaped mixing sheets, so that 4 branches of urea liquid drops and ship waste gas can be formed in the flowing process, a stronger mixing effect can be ensured to be realized, and the flowing resistance of the mixed fluid in the flowing process can be ensured not to be too large. 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 conditions:
L＝0.0294·ΔP·D 1.205 ·ρ -0.795 ·v 1.795 ·μ -0.205
wherein DeltaP is the pressure difference of an inlet and an 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 liquid drops, v is the flow velocity of the mixture of the waste gas and the urea liquid drops, and μ is the mixing viscosity of the waste gas and the urea liquid drops.
According to the invention, the fish-shaped mixing piece is of a symmetrical structure with thin two ends and thick middle, and the width W=0.5D of the fish-shaped mixing piece can minimize the flow resistance generated in the process of splitting the mixed fluid, so that the running power consumption of equipment is effectively reduced. When the exhaust gas mixture flows through the SK-4-90 static mixer 4, under the flow guiding effect of the fish-shaped mixing piece, the exhaust gas mixture generates a rotating speed in addition to the axial speed, 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 improved. The exhaust gas mixture sequentially passes through the left-handed unit SK-4-90-L and the right-handed mixing unit SK-4-90-R, so that the mixing effect of the exhaust gas mixture is further enhanced. Each mixing unit consists of four fish-shaped mixing plates, so that the pressure loss in the flowing process of the waste gas mixture is effectively controlled while the higher utilization rate of the inner space of the pipeline is ensured.
Ammonia gas formed after the evaporation of urea liquid drops and ship waste gas gradually start to react after passing through the mixer. Because the oxidation-reduction reaction of the nitrogen oxides needs higher activation energy, the reaction needs to be carried out under the condition of a catalyst to ensure that the nitrogen oxides have higher removal efficiency. The catalyst has a certain volume, and in order to fully utilize the activity of each part of the catalyst, the mixed fluid must be distributed uniformly enough after entering the catalyst; in addition, a certain temperature window is needed for the catalyst to function, and the optimal reaction temperature for the reduction and removal reaction of the nitrogen oxides is 280-420 ℃. Therefore, it is also necessary to control the temperature of the catalytic reactor so that the catalytic reaction is always within the optimal reaction window. In order to achieve the above-described advantageous effects, the temperature-controlled catalyst 5 of the present invention includes: the expansion pipe 51, the steam heating shell 52, the catalyst supporting pipe 53, the steam inlet pipe 54, the steam inlet valve 55, the steam outlet pipe 56, the first thermometer 57, the second thermometer 58, the flowmeter 59, the switch valve 510, the distributor 511, the distributor bracket 512, the SCR catalyst 513, the collecting pipe 514, the resistor inlet pipe 515 and the resistor inlet regulating valve 516, wherein the flowmeter 59 is welded on the gas pipe 1 behind the mixer 4 for reading and monitoring the flow rate of the mixed fluid in real time. The switch valve 510 is welded to the gas pipe 1 behind the flow meter 59 for controlling the on/off of the distributor 511. The end part of the gas pipe 1 is welded with the expanding pipe 51, a distributor bracket 512 is welded at the inlet of the expanding pipe 51, a distributor 511 is arranged in the distributor bracket 512, and the distributor is an axial flow blade and can uniformly distribute mixed fluid at the catalyst inlet through rotation; the distributor 511 is connected to a resistor intake pipe 515, and a resistor intake air adjusting valve 516 is provided to the resistor intake pipe 515, and the gas flow in the resistor intake pipe 515 is adjusted by the resistor intake air adjusting valve 516, thereby adjusting the rotation speed of the distributor 511. The outlet of the expanding tube 51 is fixedly connected with one end of a catalyst supporting tube 53 in a welding way, the other end of the catalyst supporting tube 53 is fixedly connected with the inlet of a collecting tube 514 in a welding way, the other end of the collecting tube 514 is fixedly connected with a discharge tube 6 in a welding way, a second thermometer 58 is arranged on the expanding tube 51, a first thermometer 57 is arranged on the collecting tube 514, and the temperature of the mixed fluid at the inlet of the catalyst 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. The inside of the catalyst supporting tube 53 is provided with an SCR catalyst 513, the outside of the catalyst supporting tube 53 is wrapped with a steam heating shell 52, the upper end of the steam heating shell 52 is provided with a steam outlet pipe 56, the lower end of the steam heating shell 52 is provided with a steam inlet pipe 54, the steam inlet pipe 54 is provided with a steam inlet valve 55, high-temperature steam enters through the steam inlet pipe 54 below the steam heating shell 52, the SCR catalyst 513 in the catalyst supporting tube 53 is heated, the temperature is kept in an optimal reaction temperature interval, and when the first thermometer 57 monitors that the temperature of the outlet of the catalyst 5 is lower than the optimal reaction temperature interval, the air inlet amount of the high-temperature steam is regulated by the steam inlet valve 55, so that the temperature in the catalyst supporting tube 53 is regulated 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 optimal reaction temperature zone, the amount of intake air of the high-temperature steam is adjusted by the steam intake valve 55, thereby adjusting the temperature in the catalyst support tube 53 to the optimal reaction temperature zone.
As shown in fig. 10, the distributor 511 of the present invention includes: the sleeve 5111, the fixed shaft 5112, the fixed nut 5113, the blade 5114 and the 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 the 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 tube 51, the blade 5114 is driven to rotate, so that the ship exhaust gas mixture is uniformly distributed when entering the catalyst supporting tube 53; the resistor 5115 is disposed 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 marine exhaust gas mixture in the expansion pipe reaches a certain value, the on-off valve 510 acts to trigger the action of the resistor air intake regulating valve 516 on the resistor air intake pipe 515, thereby changing the flow of the gas from the resistor air intake pipe into the resistor 5115. 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 blade 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 the flow of different exhaust gas mixtures is achieved, and the higher distribution uniformity of the exhaust gas mixtures in the SCR catalytic pore channels is ensured.
Referring to fig. 11, the steam heating housing 52 of the present invention includes: a housing side wall 521, a front baffle 522, and a rear baffle 523; the front baffle 522 and the rear baffle 523 are welded at both ends of the side wall 521 of the housing; the outer side of the front baffle 522 is welded with the expander 51, and the inner side of the front baffle 522 is welded with one end of the catalyst support tube 53; the inner side of the tailgate 523 is welded to the other end of the catalyst support tube 53, and the outer side of the tailgate 523 is welded to the header 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 examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be within the scope of the invention as set forth in the following claims.
Claims (6)
1. A marine exhaust gas denitration device, comprising: the exhaust gas purification device comprises a gas pipe (1), a particle capturing and self-cleaning system, an exhaust gas driven urea solution injector, an SK-4-90 static mixer (4), a temperature control catalyst and a discharge pipe (6), wherein the gas pipe (1) is sequentially provided with the particle capturing and self-cleaning system, the exhaust gas driven urea solution injector and the SK-4-90 static mixer (4), an outlet of the gas pipe (1) is connected with an inlet of the temperature control catalyst, and an outlet of the temperature control catalyst is connected with the discharge pipe (6);
the particle capture and self-cleaning system includes: the device 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 valve (27), a second ash blowing pipe air outlet valve (28), a second ash blowing pipe air outlet two valve (29), a soot blowing outlet valve (210), a first pressure sensor (211), a soot blowing outlet pipe (212) and a second pressure sensor (213), wherein the filtering unit (21) is welded in a gas pipe (1), the first ash blowing pipe (22) is arranged on the upper side of the gas pipe (1), one end of the first ash blowing pipe (22) is positioned in front of the filtering unit (21), the first ash blowing pipe air inlet valve (26) is arranged at one end of the first ash blowing pipe (22), the other end of the first ash blowing pipe (22) is positioned behind the filtering unit (21), and the first ash blowing pipe air valve (27) is arranged at the other end of the first ash blowing pipe (22); the lower side of the gas pipe (1) is provided with a second ash blowing pipe (23), one end of the second ash blowing pipe (23) is positioned in front of the filtering unit (21), one end of the second ash blowing pipe (23) is provided with a second ash blowing pipe exhaust valve (28), the other end of the second ash blowing pipe (23) is positioned at the rear of the filtering unit (21), the other end of the second ash blowing pipe (23) is provided with a second ash blowing pipe exhaust valve (29), the middle part of the second ash blowing pipe (23) is provided with a soot blowing exhaust pipe (212), and the soot blowing exhaust pipe (212) is provided with a soot blowing exhaust valve (210); one end of a first ash blowing pipe (22) in front of the filtering unit (21) is positioned in front of one end of a second ash blowing pipe (23), and the other end of the first ash blowing pipe (22) behind the filtering unit (21) and the other end of the second ash blowing pipe (23) are positioned on the same vertical line; the gas 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 ash blowing pipe (22) and one end of the second ash blowing pipe (23); the main pipe second valve (25) is positioned at the rear of the filtering unit (21), and the main pipe second valve (25) is positioned at the rear of the other end of the first ash blowing pipe (22); the first pressure sensor (211) and the second pressure sensor (213) are arranged on the gas pipe (1), the second pressure sensor (213) is positioned in front of the first ash blowing pipe (22), and the first pressure sensor (211) is positioned behind the first ash blowing pipe (22);
the exhaust gas driven urea solution injector comprises: 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); the exhaust gas injection valve (32) is welded on the exhaust gas injection pipe (31), the compressor inlet valve (36) is welded on the front inlet pipeline of the air compressor (35), the exhaust gas injection pipe (31) and the solution inlet pipe (33) are of sleeve structures, the exhaust gas injection pipe (31) is arranged in the solution inlet pipe (33), and the exhaust gas injection pipe (31) and the solution inlet pipe (33) are connected with the spray head (34);
the shower nozzle (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 threads (346), wherein the exhaust gas injection pipe connecting pipe (341) is sleeved in 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 threads; 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 waste gas injection pipe takeover (341) through screw thread (346), be equipped with gasket (345) between atomizing piece and solution advances pipe takeover (343), just the atomizing piece runs through nozzle cap hole (3442), the atomizing piece includes: the device comprises an atomization sheet main body (3421), an exhaust gas through hole (3422), a solution through hole (3423), an exhaust gas compression cavity (3424) and an atomization sheet internal thread (3425), wherein the exhaust gas compression cavity (3424) is arranged in the atomization sheet main body (3421), the exhaust gas compression cavity (3424) is connected with an exhaust gas injection pipe connecting pipe (341) through the atomization sheet internal thread (3425), the atomization sheet 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) is led into the gas pipe (1);
the temperature-controlled catalyst includes: the device comprises an expansion 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 an SK-4-90 static 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 expansion pipe (51), the distributor bracket (512) is welded at the inlet of the expansion pipe (51), the distributor (511) is arranged in the distributor bracket (512), the distributor (511) is connected with the resistor inlet pipe (515), and the resistor inlet pipe (516) is arranged on the resistor inlet pipe (515); the outlet of the expanding pipe (51) is fixedly connected with one end of a catalyst supporting pipe (53) in a welding way, the other end of the catalyst supporting pipe (53) is fixedly connected with the inlet of a collecting pipe (514) in a welding way, the other end of the collecting pipe (514) is fixedly connected with a discharge pipe (6) in a welding way, a second thermometer (58) is arranged on the expanding pipe (51), and a first thermometer (57) is arranged on the collecting pipe (514); the inside of catalyst stay tube (53) is equipped with SCR catalyst (513), outside parcel steam heating casing (52) of catalyst stay tube (53), the upper end of steam heating casing (52) is equipped with steam outlet duct (56), the lower extreme of steam heating casing (52) is equipped with steam intake pipe (54), be equipped with steam inlet valve (55) on steam intake pipe (54).
2. The ship 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 plates after clockwise rotating for 90 degrees; the right-handed mixing unit SK-4-90-R is formed by welding four fish-shaped mixing plates after rotating anticlockwise by 90 degrees; 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.
3. The ship exhaust gas denitration device according to claim 2, wherein the length L of the fish-shaped mixing piece satisfies:
wherein DeltaP is the pressure difference of an inlet and an outlet of the SK-4-90 static mixer, D is the inner diameter of a gas transmission pipe, ρ is the mixing density of waste gas and urea liquid drops,
the flow rate of the mixture of the exhaust gas and the urea droplets is given, and mu is the mixing viscosity of the exhaust gas and the urea droplets.
4. A ship exhaust gas denitration device according to claim 3, wherein the fish-shaped mixing piece has a symmetrical structure with thin ends and thick middle, and the width w=0.5d of the fish-shaped mixing piece.
5. The ship exhaust gas denitration device according to claim 1, characterized in that 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 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 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 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).
6. The marine exhaust gas denitration device according to claim 1, wherein the steam heating housing (52) includes: a housing 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 plate (522) is welded with the expanding pipe (51), and the inner side of the front baffle plate (522) is welded with one end of the catalyst supporting pipe (53); the inner side of the rear baffle plate (523) is welded with the other end of the catalyst supporting tube (53), and the outer side of the rear baffle plate (523) is welded with the collecting pipe (514).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210714800.4A CN115126574B (en) | 2022-06-23 | 2022-06-23 | Ship exhaust gas denitration device |
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