CN105003326B - Marine exhaust denitrating system - Google Patents
Marine exhaust denitrating system Download PDFInfo
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- CN105003326B CN105003326B CN201510451568.XA CN201510451568A CN105003326B CN 105003326 B CN105003326 B CN 105003326B CN 201510451568 A CN201510451568 A CN 201510451568A CN 105003326 B CN105003326 B CN 105003326B
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- exhaust gas
- valve
- denitration
- pipeline
- waste gas
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- 239000007789 gas Substances 0.000 claims abstract description 155
- 239000002912 waste gas Substances 0.000 claims abstract description 79
- 238000006243 chemical reaction Methods 0.000 claims description 49
- 238000007599 discharging Methods 0.000 claims description 25
- 238000005192 partition Methods 0.000 claims description 14
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 7
- 239000004202 carbamide Substances 0.000 claims description 7
- 239000003054 catalyst Substances 0.000 claims description 6
- 230000002000 scavenging effect Effects 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 33
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 12
- 230000007797 corrosion Effects 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 238000009833 condensation Methods 0.000 description 6
- 230000005494 condensation Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000004321 preservation Methods 0.000 description 6
- 238000005485 electric heating Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
A kind of marine exhaust denitrating system, including exhaust gas denitration pipeline, exhaust gas denitration pipeline are connected by the exhaust end of the first valve and diesel engine；The in line pipeline of waste gas, the in line pipeline of waste gas are connected by the exhaust end of the second valve and diesel engine, and the in line pipeline of waste gas includes the in line main line of waste gas and the in line branch road of waste gas；Benitration reactor, Benitration reactor include reative cell and exhaust steam passage, and reative cell is connected in exhaust gas denitration pipeline, and exhaust steam passage is connected in the in line branch road of waste gas；Wherein, the first valve opening, the second valve are closed, and waste gas is discharged through exhaust gas denitration pipeline after reative cell carries out denitration；First valve is closed, the second valve opening, and a part of waste gas is discharged through the in line main line of waste gas, and another part waste gas enters through the in line branch road of waste gas in the exhaust steam passage of Benitration reactor to be incubated to reactor.The present invention sets exhaust steam passage and the in line branch road of waste gas, and the reative cell of Benitration reactor is preheated by waste gas, is incubated, can reduce energy consumption.
Description
Technical Field
The invention relates to the field of atmospheric environment protection, in particular to a ship waste gas denitration system.
Background
According to the requirement of a amendment of the rules for preventing air pollution caused by ships in the appended book VI of MARPOL 73/78 convention passed by the International Maritime Organization (IMO), nitrogen oxides in the ship exhaust gas can be discharged after being treated to reach the standard. For a low-speed marine diesel engine (the rotating speed n is less than 130rpm), the content of nitrogen oxides after treatment is less than 3.4g/kwh, and for the current low-speed diesel engine, the emission requirement cannot be met only by optimizing the combustion mode of the diesel engine. Therefore, a marine diesel engine must be equipped with a marine exhaust gas denitration system, and Selective Catalytic Reduction (SCR) is a diesel engine after-treatment technology which is the most widely used technology.
At present, a ship exhaust gas denitration system can only operate when entering an Emission Control Area (ECA Area), and a denitration device is in a shutdown state when a ship operates in a non-ECA Area. For a ship adopting the SCR technology, when the ship drives from a non-ECA area to an ECA area, the temperature in the SCR reactor is low, and the temperature required by the denitration reaction cannot be met; meanwhile, due to the sealing problem of the valve, partial waste gas can be leaked into the SCR reactor, and if the SCR reactor is in a low-temperature state for a long time, SO in the waste gas can be caused3The condensation forms sulfuric acid, which causes corrosion of the reactor, so preheating and heat preservation measures of the SCR reactor are necessary. However, the traditional denitration device adopts electric heating to preheat and keep warm the SCR reactor, so that the electric consumption is large, the electric heating equipment is quick to age, and the efficiency is low.
Disclosure of Invention
The invention aims to provide a ship exhaust gas denitration system, which can reduce energy consumption by preheating and insulating a reactor in a non-ECA region without adopting electric heating.
The invention relates to a ship exhaust gas denitration system, which comprises
The exhaust gas denitration pipeline is connected with the exhaust end of the diesel engine through a first valve;
the exhaust gas direct discharging pipeline is connected with the exhaust end of the diesel engine through a second valve and comprises a main exhaust gas direct discharging pipeline and an exhaust gas direct discharging branch pipeline;
the denitration reactor comprises a reaction chamber and an exhaust gas channel, the reaction chamber is connected in the exhaust gas denitration pipeline, and the exhaust gas channel is connected in the exhaust gas direct discharge branch; wherein,
the first valve is opened, the second valve is closed, and the waste gas is discharged after denitration in the reaction chamber through the waste gas denitration pipeline; the first valve is closed, the second valve is opened, one part of waste gas is discharged through the waste gas direct discharging main pipeline, and the other part of waste gas enters the waste gas channel of the denitration reactor through the waste gas direct discharging branch to preserve the temperature of the reaction chamber.
Furthermore, the reaction chamber and the waste gas channel are separated by a partition plate, the reaction chamber and the waste gas channel are not communicated with each other, and the reaction chamber and the waste gas channel are respectively provided with an air inlet and an air outlet.
Further, be equipped with at least one this baffle in this denitration reactor, this denitration reactor is the drum structure, and this at least one baffle sets up and forms the waste gas passageway of corresponding quantity in the axis of this denitration reactor of being on this denitration reactor's circumference, and every waste gas passageway all communicates with the straight branch road of this waste gas.
Further, a catalyst layer is arranged in the reaction chamber, and the catalyst layer is arranged in a grid shape in the reaction chamber.
Further, the exhaust end of the diesel engine is provided with a waste gas collecting box, the waste gas denitration pipeline is connected with the waste gas collecting box through the first valve, and the waste gas direct discharge pipeline is connected with the waste gas collecting box through the second valve.
Further, the air inlet end of this diesel engine is equipped with turbo charger, and this turbo charger includes waste gas inlet end, exhaust outlet end, air inlet end and air outlet end, and this air inlet end is connected with the sweep gas case of this diesel engine, and this air outlet end is connected with the air inlet end of this diesel engine, and this waste gas inlet end is connected with this waste gas denitration pipeline and the straight pipeline of this waste gas, and this waste gas outlet end and atmosphere intercommunication.
Further, an evaporator and a mixer are further arranged in the waste gas denitration pipeline, the mixer is located in front of the reaction chamber, the evaporator is located in front of the mixer, and a urea solution spray gun is arranged in the evaporator.
Further, a third valve and a fourth valve are arranged in the exhaust gas straight-discharging branch, a fifth valve is arranged on the exhaust gas denitration pipeline, the third valve is arranged in front of the exhaust gas channel, the fourth valve is arranged behind the exhaust gas channel, and the fifth valve is arranged behind the reaction chamber.
Further, an induced draft fan is arranged between the fourth valve and the waste gas channel.
Further, the first valve, the second valve, the third valve and the fifth valve are pneumatic two-way valves, and the fourth valve is a one-way valve.
In the embodiment of the invention, the reaction chamber and the exhaust gas channel are formed in the denitration reactor in a separated mode, when a ship runs in a non-ECA area, part of exhaust gas in the exhaust gas direct discharge pipeline can enter the denitration reactor through the exhaust gas direct discharge branch, so that the reaction chamber of the denitration reactor is preheated and insulated by using the high temperature of the exhaust gas, the temperature of the denitration reactor can meet the temperature required by the denitration reaction when the ship enters the ECA area, the denitration efficiency is improved, meanwhile, sulfuric acid condensation caused by the over-low temperature of the denitration reactor is avoided, and the corrosion degree of equipment is reduced. When a ship runs in the ECA area, the waste gas channel in the denitration reactor is closed by opening and closing the corresponding valve, so that the waste gas completely enters the reaction chamber of the denitration reactor, the denitration reaction is normally carried out, and the denitration effect is achieved.
Drawings
Fig. 1 is a block diagram illustrating a denitration system for exhaust gas of a ship according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a denitration reactor in the embodiment of the invention.
Fig. 3 is a schematic structural view of a denitration reactor according to another embodiment of the present invention.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the present invention will be made with reference to the accompanying drawings and preferred embodiments.
It should be noted that, in the present specification, "before" and "after" refer to the flow direction of the exhaust gas in the pipe as a reference direction, and "after" refers to the position downstream in the flow direction of the exhaust gas.
Referring to fig. 1, a ship exhaust gas denitration system according to an embodiment of the present invention includes an exhaust gas collecting tank 15 and a turbocharger 16 connected to a diesel engine 12, and an exhaust gas denitration pipeline 11 and an exhaust gas direct discharge pipeline 13 connected between the exhaust gas collecting tank 15 and the turbocharger 16, wherein the exhaust gas direct discharge pipeline 13 includes an exhaust gas direct discharge main pipeline 132 and an exhaust gas direct discharge branch pipeline 133. The ship exhaust gas denitration system of the embodiment of the present invention further includes a first valve 111, an evaporator 113, a mixer 114, and a fifth valve 112 located in the exhaust gas denitration pipeline 11, a second valve 131, a third valve 134, a fourth valve 135, and an induced draft fan 136 located in the exhaust gas direct discharge branch 133, and a denitration reactor 14 connected to the exhaust gas denitration pipeline 11 and the exhaust gas direct discharge branch 133, respectively.
Specifically, the exhaust gas header 15 is located at the exhaust end 121 of the diesel engine 12, and the exhaust gas header 15 is used for collecting the exhaust gas discharged from the marine diesel engine 12 and discharging the exhaust gas into a subsequent pipeline.
The turbocharger 16 is located at the intake end 122 of the diesel engine 12, and the turbocharger 16 is used for partially converting energy in the high-temperature and high-pressure exhaust gas into fresh air collected by the scavenging box 123 of the diesel engine 12, and the fresh air enters the marine diesel engine 12 for the next combustion. Specifically, the turbocharger 16 includes an exhaust gas inlet end 161, an exhaust gas outlet end 162, an air outlet end 163 and an air inlet end 164, wherein the air inlet end 164 is connected to the scavenging box 123 of the diesel engine 12, the air outlet end 163 is connected to the air inlet end 122 of the diesel engine 12, the exhaust gas inlet end 161 is connected to the exhaust gas denitration line 11 and the exhaust gas direct discharge line 13, and the exhaust gas outlet end 162 is communicated with the atmosphere.
The denitration reactor 14 is connected with the waste gas denitration pipeline 11 and the waste gas direct discharging branch 133 respectively, the denitration reactor 14 comprises a reaction chamber 141 and a waste gas channel 142, the reaction chamber 141 is connected with the waste gas denitration pipeline 11, the reaction chamber 141 is used for carrying out denitration treatment on the waste gas, and the waste gas channel 142 is connected with the waste gas direct discharging branch 133 and is used for circulating the waste gas in the waste gas direct discharging branch 133.
Specifically, referring to fig. 2, the reaction chamber 141 and the exhaust channel 142 are separated by a partition 145, the reaction chamber 141 and the exhaust channel 142 are adjacent to each other and not communicated with each other, and the reaction chamber 141 and the exhaust channel 142 are respectively provided with an air inlet (not shown) and an air outlet (not shown). The denitration reactor 14 is a cylindrical structure, the number of the partition plates 145 is at least 1, the at least one partition plate 145 is arranged in parallel with the axis of the denitration reactor 14 in the circumferential direction of the denitration reactor 14 to form a corresponding number (the same number) of exhaust gas channels 142, and each exhaust gas channel 142 is communicated with the exhaust gas straight branch 133. In this embodiment, the number of the partition plates 145 is 1, the partition plates 145 are arranged along the axial direction of the denitration reactor 14, the partition plates 145 and the small arc sections of the casing 143 of the denitration reactor 14 form the flue gas channel 142, the partition plates 145 and the large arc sections of the casing 143 of the denitration reactor 14 form the reaction chamber 141, and the reaction chamber 141 is provided with the catalyst layer 146 for performing denitration treatment on the flue gas. In another embodiment of the present invention, as shown in fig. 3, the denitration reactor 14 is provided with 4 partition plates 145, the 4 partition plates 145 are symmetrically disposed along the axial direction of the denitration reactor 14 to form 4 off-gas passages 142, the 4 off-gas passages 142 are all communicated in the off-gas direct exhaust branch 133, and in order to achieve the communication between the 4 off-gas passages 142, communication passages between the off-gas passages 142 may be provided at both end portions of the denitration reactor 14. Understandably, the number and arrangement of the partition plates 145 can be adjusted according to the size and capacity of the denitration reactor 14 and the temperature required for heating, but are not limited thereto.
Referring to fig. 1 again, the exhaust gas denitration pipeline 11 is connected to the exhaust gas collecting box 15 at the exhaust end 121 of the diesel engine 12 through the first valve 111, the evaporator 113, the mixer 114 and the fifth valve 112 are connected to the exhaust gas denitration pipeline 11, the fifth valve 112 is located between the reaction chamber 141 and the turbocharger 16, the mixer 114 is disposed in front of the reaction chamber 141, the evaporator 113 is disposed in front of the mixer 114, the evaporator 113 is provided with a urea solution spray gun 115, wherein the urea solution spray gun 115 is used for atomizing the urea solution, the evaporator 113 is used for hydrolyzing the urea solution to generate ammonia, the mixer 114 is used for fully mixing the ammonia gas with the exhaust gas, the exhaust gas is not fully mixed in the reaction chamber 141, which may not only result in the exhaust gas treatment failing to reach the standard, but also increase the escape of ammonia. In the present embodiment, the first valve 111 and the fifth valve 112 are pneumatic two-way valves, and in another embodiment of the present invention, the fifth valve 112 can also be a one-way valve. When the first valve 111 and the fifth valve 112 are opened, the exhaust gas generated by the diesel engine 12 enters the exhaust gas denitration pipeline 11 from the exhaust gas collecting box 15, the exhaust gas firstly enters the evaporator 113, then the ammonia gas generated by the decomposition of the urea solution enters the mixer 114 together with the ship exhaust gas, the gas fully mixed in the mixer 114 enters the reaction chamber 141 of the denitration reactor 14, and the catalyst layer 146 introduces the exhaust gasDenitration is carried out to ensure NO and NO in the exhaust gas2Is reduced to N2And H2And O, finally, the denitrated exhaust gas enters the turbocharger 16 through the fifth valve 112, the turbocharger 16 converts part of energy in the high-temperature and high-pressure exhaust gas into fresh air collected by the scavenging box 123, the fresh air enters the marine diesel engine 12 for next combustion, and the treated exhaust gas is discharged to the atmosphere through an exhaust gas outlet end 162 of the turbocharger 16.
The exhaust gas direct discharging pipeline 13 is connected with the exhaust gas collecting tank 15 of the exhaust end 121 of the diesel engine 12 through a second valve 131, and the exhaust gas direct discharging pipeline 13 is divided into an exhaust gas direct discharging main pipeline 132 and an exhaust gas direct discharging branch 133 after the second valve 131. Specifically, the main exhaust gas direct drain pipe 132 is connected between the second valve 131 and the turbocharger 16, and most of the exhaust gas is discharged after entering the exhaust gas direct drain pipe 13 and directly reaching the turbocharger 16 through the main exhaust gas direct drain pipe 132. The exhaust gas direct discharging branch 133 is provided with a third valve 134, a fourth valve 135 and an induced draft fan 136, wherein the third valve 134 is located before the exhaust gas channel 142 of the denitration reactor 14, the fourth valve 135 is located after the exhaust gas channel 142 of the denitration reactor 14, and the induced draft fan 136 is connected between the exhaust gas channel 142 and the fourth valve 135, so that the other part of the exhaust gas entering the exhaust gas direct discharging pipeline 13 enters the exhaust gas channel 142 of the denitration reactor 14 through the third valve 134, and then reaches the turbocharger 16 through the induced draft fan 136 and the fourth valve 135 to be discharged. Since the exhaust gas flowing through the exhaust gas channel 142 is used for heat preservation and preheating of the reaction chamber 141, the temperature of the reaction chamber 141 must be ensured to be above 200 ℃ for the amount of the exhaust gas entering the exhaust gas channel 142, and the induced draft fan 136 is used for ensuring the amount of the exhaust gas entering the exhaust gas channel and preventing the exhaust gas from flowing back. In this embodiment, the second valve 131 and the third valve 134 are pneumatic two-way valves, and the fourth valve 135 is a one-way valve. In another embodiment of the present invention, the third valve 134 and the fourth valve 135 can be both one-way valves.
When the ship operates in the ECA area, the first valve 111 and the fifth valve 112 are opened, and the second valve 131 is closed, so that the exhaust gas is discharged after being denitrated in the reaction chamber 141 through the exhaust gas denitration pipeline 11, so as to meet the exhaust gas emission requirement of the current area.
When the ship runs in a non-ECA area, the first valve 111 and the fifth valve 112 are closed, and the second valve 131, the third valve 134 and the fourth valve 135 are simultaneously opened, so that the exhaust gas does not enter the reaction chamber 141 of the denitration reactor 14 after coming out of the exhaust gas collecting box 15, most of the exhaust gas directly enters the turbocharger 16 through the exhaust gas direct discharge main pipeline 132, and the other part of the exhaust gas enters the exhaust gas channel 142 of the denitration reactor 14 through the third valve 134, thereby achieving the effect of preheating and heat preservation of the denitration reactor 14, and reducing the power consumption and the equipment corrosion.
In summary, the denitration system for ship exhaust gas of the present invention at least has the following advantages:
according to the invention, the partition plate is added in the denitration reactor, so that the waste gas channel adjacent to the reaction chamber is formed in the denitration reactor, when a ship runs in a non-ECA area, part of waste gas in the waste gas direct discharge pipeline can enter the denitration reactor through the waste gas direct discharge branch, and because the waste gas is in a high-temperature state, the reaction chamber of the denitration reactor can be preheated and insulated by using the high temperature of the waste gas, so that the temperature of the denitration reactor can meet the temperature required by the denitration reaction when the ship enters the ECA area, the denitration efficiency is improved, the sulfuric acid condensation caused by the over-low temperature of the denitration reactor is avoided, and the corrosion degree of equipment is reduced. When a ship runs in the ECA area, the waste gas channel in the denitration reactor is closed by opening and closing the corresponding valve, so that the waste gas completely enters the reaction chamber of the denitration reactor, the denitration reaction is normally carried out, and the denitration effect is achieved. According to the invention, the waste gas bypass is formed by adding the partition plates in the denitration reactor, and the waste gas direct-discharging branch corresponding to the waste gas bypass is arranged, so that the structure is simple, the reactor is not required to be preheated and insulated by electric heating in a non-ECA region, and the energy consumption can be reduced.
Finally, the present invention is illustrated by specific examples to achieve the following effects:
the first embodiment is as follows:
a72000 DWT bulk carrier has a main engine power of 8000kw and an exhaust gas flow of 60000kg/h, with a nitrogen oxide content of 13 g/kwh. By using the ship waste gas denitration system provided by the invention, the content of nitrogen oxide in the treated waste gas can reach below 3g/kwh, and the discharge requirement of IMO on the nitrogen oxide can be met. Meanwhile, the electric power consumption saved by preheating and heat preservation of the denitration reactor is 15kw, and corrosion caused by sulfuric acid condensation is not found.
Example two:
in a 150000DWT crude oil vessel, the power of the main engine is 15000kw, the exhaust gas flow is approximately 130000kg/h, and the nitrogen oxide content is 13.8 g/kwh. By using the ship waste gas denitration system provided by the invention, the content of nitrogen oxide in the treated waste gas can reach below 3.2g/kwh, and the discharge requirement of IMO on the nitrogen oxide can be met. Meanwhile, the electric power consumption saved by preheating and heat preservation of the denitration reactor is 32kw, and corrosion caused by sulfuric acid condensation is not found.
Example three:
in a 2000TEU container ship, the power of the main engine is 17000kw, the exhaust gas flow is 150000kg/h, and the nitrogen oxide concentration is 12 g/kwh. By using the ship waste gas denitration system provided by the invention, the content of nitrogen oxide in the treated waste gas can reach below 3g/kwh, and the discharge requirement of IMO on the nitrogen oxide can be met. Meanwhile, the electric power consumption saved by preheating and heat preservation of the denitration reactor is 35kw, and corrosion caused by sulfuric acid condensation is not found.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The utility model provides a boats and ships exhaust denitration system which characterized in that: comprises that
An exhaust gas denitration line (11), wherein the exhaust gas denitration line (11) is connected with an exhaust end (121) of the diesel engine (12) through a first valve (111);
the exhaust gas direct discharging pipeline (13), the exhaust gas direct discharging pipeline (13) is connected with the exhaust end (121) of the diesel engine (12) through a second valve (131), and the exhaust gas direct discharging pipeline (13) comprises an exhaust gas direct discharging main pipeline (132) and an exhaust gas direct discharging branch pipeline (133);
the denitration reactor (14), the denitration reactor (14) includes a reaction chamber (141) and an exhaust gas channel (142), the reaction chamber (141) is connected in the exhaust gas denitration pipeline (11), the exhaust gas channel (142) is connected in the exhaust gas direct discharge branch (133), the reaction chamber (141) and the exhaust gas channel (142) are separated by a partition plate (145), the reaction chamber (141) and the exhaust gas channel (142) are not communicated with each other, and the reaction chamber (141) and the exhaust gas channel (142) are respectively provided with an air inlet and an air outlet; wherein,
the first valve (111) is opened, the second valve (131) is closed, and the exhaust gas is discharged after denitration in the reaction chamber (141) through the exhaust gas denitration pipeline (11); the first valve (111) is closed, the second valve (131) is opened, one part of the waste gas is discharged through the waste gas direct discharging main pipeline (132), and the other part of the waste gas enters the waste gas channel (142) of the denitration reactor (14) through the waste gas direct discharging branch (133) to preserve the temperature of the reaction chamber (141).
2. The marine exhaust gas denitration system of claim 1, wherein: be equipped with at least one this baffle (145) in this denitration reactor (14), this denitration reactor (14) are the drum structure, and this at least one baffle (145) sets up and forms corresponding quantity's waste gas passageway (142) on the circumference of this denitration reactor (14) and parallel to the axis of this denitration reactor (14), and every waste gas passageway (142) all communicates with this waste gas straight branch way (133).
3. The marine exhaust gas denitration system of claim 1, wherein: a catalyst layer (146) is provided in the reaction chamber (141), and the catalyst layer (146) is provided in a grid-like manner in the reaction chamber (141).
4. The marine exhaust gas denitration system of claim 1, wherein: an exhaust end (121) of the diesel engine (12) is provided with an exhaust gas collecting box (15), the exhaust gas denitration pipeline (11) is connected with the exhaust gas collecting box (15) through the first valve (111), and the exhaust gas direct discharge pipeline (13) is connected with the exhaust gas collecting box (15) through the second valve (131).
5. The marine exhaust gas denitration system of claim 1, wherein: the air inlet end (122) of the diesel engine (12) is provided with a turbocharger (16), the turbocharger (16) comprises an exhaust gas inlet end (161), an exhaust gas outlet end (162), an air inlet end (164) and an air outlet end (163), the air inlet end (164) is connected with a scavenging box (123) of the diesel engine (12), the air outlet end (163) is connected with the air inlet end (122) of the diesel engine (12), the exhaust gas inlet end (161) is connected with the exhaust gas denitration pipeline (11) and the exhaust gas direct drainage pipeline (13), and the exhaust gas outlet end (162) is communicated with the atmosphere.
6. The marine exhaust gas denitration system of claim 1, wherein: an evaporator (113) and a mixer (114) are also arranged in the waste gas denitration pipeline (11), the mixer (114) is positioned in front of the reaction chamber (141), the evaporator (113) is positioned in front of the mixer (114), and a urea solution spray gun (115) is arranged in the evaporator (113).
7. The marine exhaust gas denitration system of claim 1, wherein: a third valve (134) and a fourth valve (135) are arranged in the exhaust gas direct discharging branch (133), a fifth valve (112) is arranged on the exhaust gas denitration pipeline (11), the third valve (134) is positioned in front of the exhaust gas channel (142), the fourth valve (135) is positioned behind the exhaust gas channel (142), and the fifth valve (112) is positioned behind the reaction chamber (141).
8. The marine exhaust gas denitration system of claim 7, wherein: an induced draft fan (136) is arranged between the fourth valve (135) and the waste gas channel (142).
9. The marine exhaust gas denitration system of claim 7, wherein: the first valve (111), the second valve (131), the third valve (134) and the fifth valve (112) are pneumatic two-way valves, and the fourth valve (135) is a one-way valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510451568.XA CN105003326B (en) | 2015-07-28 | 2015-07-28 | Marine exhaust denitrating system |
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|---|---|---|---|
| CN201510451568.XA CN105003326B (en) | 2015-07-28 | 2015-07-28 | Marine exhaust denitrating system |
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| CN105003326B true CN105003326B (en) | 2017-12-08 |
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| CN105944567B (en) * | 2016-06-24 | 2018-08-21 | 青岛双瑞海洋环境工程股份有限公司 | Marine exhaust denitrating system |
| DE102016113380A1 (en) * | 2016-07-20 | 2018-01-25 | Man Diesel & Turbo Se | Method for operating an internal combustion engine and internal combustion engine |
| DE102016113375A1 (en) * | 2016-07-20 | 2018-01-25 | Man Diesel & Turbo Se | Method for operating an internal combustion engine and internal combustion engine |
| CN106166446A (en) * | 2016-08-31 | 2016-11-30 | 山东格润内泽姆环保科技有限公司 | A kind of integrated form marine diesel emission-control equipment |
| CN106640291A (en) * | 2016-12-08 | 2017-05-10 | 青岛双瑞海洋环境工程股份有限公司 | Ship waste gas denitration system |
| CN106731832A (en) * | 2017-01-09 | 2017-05-31 | 青岛双瑞海洋环境工程股份有限公司 | Marine exhaust denitrating system |
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