CN110714818A - Marine urea solution supply system and application thereof - Google Patents
Marine urea solution supply system and application thereof Download PDFInfo
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- CN110714818A CN110714818A CN201910988420.8A CN201910988420A CN110714818A CN 110714818 A CN110714818 A CN 110714818A CN 201910988420 A CN201910988420 A CN 201910988420A CN 110714818 A CN110714818 A CN 110714818A
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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]
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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
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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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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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
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- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention relates to the field of urea solution supply systems, in particular to a marine urea solution supply system and application thereof; the system comprises three modules, namely a urea pump station unit, a compressed air supply unit and a urea spray gun unit; the compressed air supply unit further comprises a urea blowing unit and an auxiliary air atomization unit, the urea spray gun nozzle unit comprises a urea solution supply pipeline, and the urea blowing pipeline and the auxiliary air atomization pipeline are three pipelines. This system can be according to host computer signal real-time regulation urea solution flow, in time adjusts atomizing air pressure simultaneously, realizes the best ratio between them, reaches the best atomization effect, avoids the too much environmental pollution and the wasting of resources that cause of urea solution simultaneously, and this system still possesses air purge and fresh water cleaning function in addition to prevent urea solution crystallization, block passageway and nozzle, improve the denitration efficiency of system, reduce NOx and discharge.
Description
Technical Field
The invention relates to the field of urea solution supply systems, in particular to a urea solution supply system based on a marine SCR technology and application thereof.
Background
The information disclosed in this background of the invention is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
The International Maritime Organization (IMO) passed the MAPOL convention VI amendment 10 in 2008, which required that the nitrogen oxide emissions of the diesel engines of ships built in 2016, 1 and later had to meet the Tier iii standard, i.e. 3.4g/(kW · h) for low-speed engines (rotation speed less than 130r/min) and 9 xn for medium-speed engines (130r/min n 2000r/min) for-0.2g/(kWh.h), and the high-speed machine (the rotating speed n is more than 1300r/min) is 1.97 g/(kWh.h).
In order to meet the Tier III standard, an exhaust gas treatment device must be additionally arranged on a ship, and a Selective Catalytic Reduction (SCR) system is one of effective measures for reducing NOx emission in the exhaust gas of a diesel engine at present. With the implementation of the Tier iii standard there will be more and more ship mounted SCR units. When the selective catalytic reduction technology is adopted to carry out denitration treatment on the waste gas, a reducing agent is firstly sprayed into the waste gas with the temperature of 170-550 ℃, the reducing agent can be pure ammonia gas, ammonia water or a urea solution, and the urea is convenient to store and transport and generally serves as the first choice of the reducing agent. The urea solution is atomized by a spray gun nozzle, pyrolyzed or hydrolyzed to become ammonia gas. Subsequently, the mixture of ammonia and exhaust gas is subjected to catalytic reduction reaction under the action of a catalyst, so that nitrogen oxides are converted into nitrogen and water vapor, and the content of NOx in the exhaust gas is reduced.
Disclosure of Invention
At present, the SCR urea injection supply system for actual shipment mostly adopts a metering pump, however, the inventor further researches and discovers that: when the main engine is in low load, the urea injection supply system has poor injection precision, obvious pressure flow fluctuation, no contribution to reaction, and extremely easy environmental pollution and resource waste. It can be seen that the current marine SCR technology is still not mature, and the SCR urea supply system is a key component of the SCR system, so that it is of great significance to develop an efficient SCR urea supply system with energy saving, low consumption and stable operation. In view of the above problems, the present invention is directed to a urea solution supply system for ships.
In order to achieve the purpose, the invention adopts the following technical means:
first, the present invention discloses a marine urea solution supply system, which adopts a modular structure, comprising: the device comprises three modules, namely a urea pump station unit, a compressed air supply unit and a urea spray gun unit. The compressed air supply unit further comprises a urea blowing unit and an auxiliary air atomization unit, the urea spray gun nozzle unit comprises a urea solution supply pipeline, a urea blowing pipeline and an auxiliary air atomization pipeline, and the urea solution supply pipeline is communicated with the urea pump station unit and is used for supplying urea solution to the urea spray gun nozzle unit; the urea purging pipeline is used for connecting the urea spray gun unit and the urea purging unit; and the auxiliary air atomization pipeline is used for connecting the urea spray gun unit and the auxiliary air atomization unit.
Secondly, the invention discloses the application of the marine urea solution supply system in ships, and preferably the marine urea solution supply system is used for treating nitrogen oxide-containing tail gas of the ships.
Compared with the prior art, the invention has the following beneficial effects:
(1) the whole system of the invention is of a modular structure, not only can provide atomized urea solution meeting the pressure and flow requirements, but also avoids environmental pollution and resource waste caused by excessive urea solution.
(2) The auxiliary air atomization unit designed by the invention adopts the pressure regulating valve to control the output of the auxiliary air, so that the auxiliary air and the delivered urea solution can reach a preset ratio, and a better urea atomization effect is achieved.
(3) The system designed by the invention has an air blowing function, so that urea solution crystallization is prevented, a catalyst is prevented from being blocked, the denitration efficiency of the system is improved, the NOx emission is reduced, and high-efficiency energy conservation and emission reduction are realized.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic structural diagram of a marine urea solution supply system according to an embodiment of the present invention.
FIG. 2 is a schematic structural diagram of a urea pumping station unit in the embodiment of the invention.
Fig. 3 is a schematic structural view of a compressed air supply unit according to an embodiment of the present invention.
FIG. 4 is a schematic structural diagram of a urea spray gun unit according to an embodiment of the present invention.
The designations in the above figures represent respectively:
A. urea pump station unit, A1 urea solution supply line, A2 urea sweeps the pipeline, A3 auxiliary air atomization pipeline.
B. The device comprises a compressed air supply unit, a urea blowing unit, a B2 auxiliary air atomization unit and a B3 air compressor.
C. The device comprises a urea spray gun unit, an N urea box, a Y overflow valve and a D fresh water box.
1. A first solenoid valve; 2. a first ball valve; 3. a second solenoid valve; 4. a second ball valve; 5. a third electromagnetic valve; 6. a third ball valve; 7. a fourth solenoid valve; 8. a fourth ball valve; 9. a first pressure gauge; 10. a first Y-strainer; 11. a second pressure gauge; 12. a fifth ball valve; 13. a first screw pump; 14. a sixth ball valve; 15. a first safety valve; 16. a third pressure gauge; 17. a seventh ball valve; 18. a second screw pump; 19. an eighth ball valve; 20. a second relief valve; 21. a fourth pressure gauge; 22. a first check valve; 23. a fifth pressure gauge; 24. a second Y-strainer; 25. a flow control valve; 26. a flow sensor; 27. a sixth pressure gauge; 28. a ninth ball valve; 29. a tenth ball valve; 30. a first in situ flow meter; 31. an eleventh ball valve; 32. a twelfth ball valve; 33. a seventh pressure gauge; 34. a thirteenth ball valve; 35. a fifth solenoid valve; 36. a fourteenth ball valve; 37. a pressure regulating valve; 38. an eighth pressure gauge; 39. a sixth electromagnetic valve; 40. a flow switch; 41. a fifteenth ball valve; 42. a second in situ flow meter; 43. a sixteenth ball valve; 44. a seventeenth ball valve; 45. a second one-way valve; 46. a third check valve; 47. and a fourth check valve.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The terms "mounted", "connected", "fixed", and the like in the present invention are to be understood in a broad sense, and may be, for example, fixedly connected, detachably connected, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.
As described above, when the main engine is in a low load state, the current SCR urea injection supply system actually used for loading is poor in injection accuracy, has obvious pressure flow fluctuation, is not beneficial to reaction, and is very easy to cause environmental pollution and resource waste. Therefore, the invention provides a marine urea solution supply system and application thereof.
In some exemplary embodiments, the urea solution supply line and the urea pumping station unit are connected by a flange; the urea purging pipeline is connected with the urea spray gun unit and the urea purging unit through flanges; and the auxiliary air atomization pipeline is connected with the urea spray gun unit and the auxiliary air atomization unit through flanges.
In some exemplary embodiments, the urea pumping station unit is configured to: the outlet of the urea box is sequentially connected with an electromagnetic valve, a ball valve, a pressure gauge and a filter, then the loop is divided into two identical branches, each branch is provided with the ball valve, the screw pump and the ball valve, the screw pump is connected with the safety valve in parallel, and the pressure gauge is arranged on the loop where the safety valve is located and used for testing the pressure on the loop where the safety valve is located. Furthermore, a check valve, a pressure gauge and a filter are arranged on a main loop formed by connecting the outlets of the ball valves on the two branches. Then the main loop is divided into two paths again, wherein the first path is provided with a flow control valve, a flow sensor, a pressure gauge and a ball valve, the ball valve is connected with a urea solution supply pipeline, and the interface is used for connecting the urea solution supply pipeline; the second path is continuously divided into two identical paths after being connected with an overflow valve, wherein one path is communicated with the urea tank, and a ball valve and an electromagnetic valve are arranged on the connecting pipeline; the other path is connected with a fresh water tank, a ball valve and an electromagnetic valve are arranged on the connecting pipeline, and the outlet of the electromagnetic valve is connected with a urea tank.
In some exemplary embodiments, the compressed air supply unit is configured to: the outlet of the gas compressor is connected with a pipeline, a ball valve, a flowmeter, a ball valve and a pressure gauge are sequentially arranged on the pipeline, another ball valve is connected on the pipeline where the ball valve, the flowmeter and the ball valve are located in parallel, then a loop is divided into two branches from the rear of the pressure gauge, wherein the ball valve and the electromagnetic valve are arranged on the first branch, and then the first branch is connected with a urea purging pipeline, and the two branches form a urea purging unit together. The second branch is sequentially provided with a ball valve, a pressure regulating valve, a pressure gauge and an electromagnetic valve. And then the electromagnetic valve is continuously connected with a flow switch, a ball valve, a flowmeter, a ball valve and an auxiliary air atomization pipeline, the ball valve, the flowmeter and the ball valve are sequentially arranged to form a flow monitoring device, and another ball valve is connected in parallel to the part of the pipeline where the flow monitoring device is located, so that an auxiliary air atomization unit is formed.
In some exemplary embodiments, the urea spray gun unit is configured to: the urea solution supply pipeline is connected with the one-way valve and then connected to a liquid inlet of the urea spray gun unit, the one-way valve is arranged on a connecting pipeline of the urea blowing pipeline and the liquid inlet of the urea spray gun unit, and the auxiliary air atomization pipeline is connected with the fourth one-way valve and then connected to a gas inlet of the urea spray gun. Three pipelines connected with the urea spray gun nozzle unit are provided with one-way valves, so that the urea solution and the compressed air can be effectively prevented from flowing back.
In some exemplary embodiments, the urea nozzle spray gun employs an internal mixing air atomization nozzle of the porous solid cone type, optionally with a cone angle of 60 ° for constant pressure injection.
In some exemplary embodiments, the valves are connected by pipes, and the pipe joints are connected by flanges.
In some exemplary embodiments, the first filter and the second filter are both Y-filters.
In some exemplary embodiments, the flow meters are in-situ flow meters, which facilitate real-time display and observation of the flow in the pipeline.
The invention will now be further described with reference to the drawings and detailed description.
Referring to fig. 1-4, there is illustrated a marine urea solution supply system designed according to the present invention, which is of modular construction, comprising: the device comprises three modules, namely a urea pump station unit A, a compressed air supply unit B and a urea spray gun unit C. The compressed air supply unit B also comprises a urea purging unit B1 and an auxiliary air atomization unit B2, the urea spray gun nozzle unit comprises a urea solution supply pipeline A1, a urea purging pipeline A2 and an auxiliary air atomization pipeline A3, and the urea solution supply pipeline is connected with the urea pump station unit through a flange; the urea purging pipeline is connected with the urea spray gun unit and the urea purging unit through flanges; and the auxiliary air atomization pipeline is connected with the urea spray gun unit and the auxiliary air atomization unit through flanges.
Further, referring to fig. 2, the structure of the urea pumping station unit is as follows: an outlet of the urea box N is sequentially connected with a second electromagnetic valve 3, a second ball valve 4, a first pressure gauge 9, a first Y-shaped filter 10 and a second pressure gauge 11, and then a loop is divided into two identical branches, wherein a fifth ball valve 12, a first screw pump 13 and a sixth ball valve 14 are arranged on the first loop; a seventh ball valve 17, a second screw pump 18 and an eighth ball valve 19 are arranged on the second loop; the first safety valve 15 is connected with the first screw pump 13 in parallel, the second safety valve 20 is connected with the second screw pump 18 in parallel, and the pressure of a loop where the first safety valve 15 and the second safety valve 20 are located is tested by using a third pressure gauge 16 and a fourth pressure gauge 21.
The two branches where the first screw pump 13 and the second screw pump 18 are located are mutually standby, and any screw pump is selected as a working pump and the other screw pump is selected as a standby pump during working.
Further, a first check valve 22, a fifth pressure gauge 23 and a second Y-type filter 24 are arranged on a total loop formed by connecting outlets of the sixth ball valve 14 and the eighth ball valve 19 on the two branches, and then the total loop is divided into two paths, wherein a flow control valve 25, a flow sensor 26, a sixth pressure gauge 27 and a ninth ball valve 28 are arranged on the first path, and the ninth ball valve 28 is connected with a urea solution supply pipeline interface which is used for connecting a urea solution supply pipeline a 1; the second path is continuously divided into two identical paths after being connected with the overflow valve Y, wherein one path is communicated with the urea tank N, and a third ball valve 6 and a third electromagnetic valve 5 are arranged on the connecting pipeline; the other path is connected with a fresh water tank C, a fourth ball valve 8 and a fourth electromagnetic valve 7 are arranged on the connecting pipeline, and the outlet of the third electromagnetic valve 5 is communicated with the urea tank.
Further, the outlet of the fresh water tank D is connected with a first electromagnetic valve 1 and a first ball valve 2, the outlet of the first ball valve 2 is connected with the outlet of a second ball valve 4, and the two parts form a urea pump station unit.
Further, referring to fig. 3, the compressed air supply unit B has a structure of: the outlet of the compressor B3 is connected with the tenth ball valve 29, and then connected with the first in-situ flow meter 30, the eleventh ball valve 31 and the seventh pressure gauge 33, and the twelfth ball valve 32 is connected in parallel with the tenth ball valve 29, the first in-situ flow meter 30 and the eleventh ball valve 31 on the part of the pipeline where the eleventh ball valve 31 is located (i.e. the inlet of the twelfth ball valve 32 is connected with the inlet of the tenth ball valve 29, and the outlet of the twelfth ball valve 30 is connected with the outlet of the eleventh ball valve 31), and then the loop is divided into two branches from the rear of the pressure gauge, wherein the thirteenth ball valve 34 and the fifth solenoid valve 35 are arranged on the first branch, and then connected with the urea purging pipeline A2, and the urea purging.
Furthermore, a fourteenth ball valve 36, a pressure regulating valve 37, an eighth pressure gauge 38 and a sixth electromagnetic valve 39 are arranged on the second branch, and then the flow switch 40, a fifteenth ball valve 41, a second local flow meter 42, a sixteenth ball valve 43 and an auxiliary air atomization pipeline a3 are connected, a seventeenth ball valve 44 is connected in parallel to the fifteenth ball valve 41 and the second local flow meter 42, the part of the pipeline where the sixteenth ball valve 43 is located, the inlet of the seventeenth ball valve 44 is connected with the inlet of the fifteenth ball valve 41, and the outlet is connected with the outlet of the sixteenth ball valve 43, so that the auxiliary air atomization unit is formed.
The twelfth ball valve 32 is connected in parallel to the tenth ball valve 29, the first in-situ flow meter 30 and the eleventh ball valve 31, and the twelfth ball valve 32 is opened and the tenth ball valve 29 and the eleventh ball valve 31 are closed to allow the compressed air to pass therethrough in a case where the flow rate of the compressed air is not required to be determined. Similarly, the fifteenth ball valve 41 and the sixteenth ball valve 43 may be closed, and the seventeenth ball valve 44 may be opened to allow the auxiliary air to pass therethrough.
Further, referring to fig. 4, the urea spray gun unit C has a structure that: the urea solution supply pipeline A1 is connected with the second one-way valve 45 and then connected to the liquid inlet of the urea spray gun unit, the connection pipeline between the urea purging pipeline A2 and the liquid inlet of the urea spray gun unit is provided with a third one-way valve 46, and the auxiliary air atomization pipeline A3 is connected with the fourth one-way valve 47 and then connected to the gas inlet of the urea spray gun.
The urea pump station unit and the auxiliary air atomization unit can enable urea solution to achieve a good atomization effect after being sprayed by the urea spray gun unit under the control of the control system; before and when the urea pump station starts to work, the urea blowing unit is used for blowing the spray gun nozzle, so that residual urea is prevented from crystallizing and blocking the spray gun nozzle; when the urea pump station is out of work, the first electromagnetic valve 1 and the first ball valve 2 are opened, and the urea pump station unit is washed by fresh water in the fresh water tank, so that urea is prevented from being crystallized and blocking pipelines.
The auxiliary air atomization unit controls the pressure of compressed air before the nozzle by adopting a pressure regulating valve, the opening of the pressure regulating valve is regulated by a control system by taking the pressure value of the urea solution before the nozzle, which is measured by a sixth pressure gauge, as a target value, so that the pressure of the urea solution before the nozzle and the pressure of the compressed air before the nozzle are reached, namely the pressure values of the sixth pressure gauge and an eighth pressure gauge can realize the optimal proportion, and the urea solution can achieve a good atomization effect.
It can be understood that, on the basis of the embodiment 1, the following technical solutions including but not limited to the following may be derived to solve different technical problems and achieve different purposes of the invention, and specific examples are as follows:
in some implementations, the first screw pump 13 and the second screw pump 18 are used, and have the advantage of good control linearity when operating (driven by a motor), and the control system controls the opening of the flow regulating valve in a PID closed-loop control mode. The urea solution is conveyed to the spray gun nozzle through the first screw pump 13 or the second screw pump 18, and the opening of the flow control valve 25 is controlled in a PID closed loop mode through the comparison condition of the set flow and the detection value of the flow sensor 26, so that the flow passing through the control valve is equal to the set flow. Further, if the flow measured by the flow sensor 26 is higher than the set value of the control system, the control system controls to reduce the opening degree of the flow control valve 25, so as to reduce the flow of the urea solution passing through the flow control valve, at this time, the third electromagnetic valve 5 is energized, and the redundant urea solution flows through the overflow valve Y, the third ball valve 6 and the third electromagnetic valve 5 and then flows back to the urea tank N; if the flow rate measured by the flow sensor is lower than the set value of the control system, the opening of the flow control valve 25 is increased to ensure that sufficient urea solution can be delivered to the spray gun nozzle.
In other implementations, the urea nozzle spray gun employs an internal mixing air atomization nozzle of the porous solid cone type, optionally with a cone angle of 60 ° for constant pressure injection.
Further, in order to facilitate smooth connection of the components, in some implementations, the valves are connected by pipelines, and the pipeline interfaces are connected by flanges.
Further, in some implementations, the flow meters are all in-situ flow meters, which facilitate real-time display and observation of the flow in the pipeline.
In addition, the urea solution supply work is carried out by adopting the supply system, and the specific process is as follows:
in the initial state, all valves are in a closed state;
in the preparation stage, the first ball valve 2, the second ball valve 4, the third ball valve 6, the fourth ball valve 8, the fifth ball valve 12, the sixth ball valve 14 (or the seventh ball valve 17, the eighth ball valve 19), the ninth ball valve 28, the tenth ball valve 29, the eleventh ball valve 31 (or the twelfth ball valve 32), the thirteenth ball valve 34, the fourteenth ball valve 36, the fifteenth ball valve 41, and the sixteenth ball valve 43 (or the seventeenth ball valve 44) are opened, the flow switch 40 is opened, the relief valve opening pressure is set, and the urea solution supply amount is set.
When the system starts to operate, the air compressor B3 is started to provide compressed air for the compressed air supply unit, the fifth electromagnetic valve 35 is electrified to work, the compressed air flows through the fifth electromagnetic valve 35 and then enters the urea spray gun nozzle after passing through the urea purging pipeline A2 and the third one-way valve 46, and the high-pressure air is used for purging the spray gun nozzle, so that the urea spray gun pipeline is ensured to be smooth and is not blocked. If the seventh pressure gauge 33 exceeds the limit value in the process, the system sends out an alarm signal, the fifth electromagnetic valve 35 is powered off and closed, and the system is required to be checked and opened again after the system fault is eliminated.
After purging for 20s, the fifth electromagnetic valve 35 is powered off and stops working, the sixth electromagnetic valve 39 is powered on and opened, and auxiliary atomization air is continuously introduced into a gas pipeline of a nozzle of the urea spray gun.
After the urea pump station unit A is started, the first screw pump 13 or the second screw pump 18 works, the second electromagnetic valve 3 and the third electromagnetic valve 5 work in an electrified mode, the control system compares the set flow with the flow detected by the flow sensor 26, the opening degree of the flow control valve 25 is adjusted in real time, and finally the flow of the conveyed urea solution is equal to the set flow. Meanwhile, the control system adjusts the pressure value detected by the eighth pressure gauge 38, namely the atomization air pressure in front of the nozzle, by controlling the pressure adjusting valve 37, so that the optimal ratio can be realized between the pressure value and the pressure value of the sixth pressure gauge 27, namely the urea solution pressure in front of the nozzle, and the urea solution can achieve a good atomization effect.
When the urea solution supplying device normally operates, the control system controls the first screw pump 13 or the second screw pump 18 to pump urea solution with different amount to enter a pipeline under different working conditions, and the control system can adjust the opening degree of the flow control valve 25 in a PID closed-loop control mode according to the set flow and the flow comparison condition detected by the flow sensor 26, so that the flow detected by the flow sensor 26 is equal to the given flow, under the condition of ensuring sufficient urea solution supply, secondary pollution caused by excessive ammonia along with exhaust emission is avoided, the waste of the urea solution is avoided, and resources are saved.
If the flow measured by the flow sensor 26 is higher than the set value of the control system, the control system controls to reduce the opening degree of the flow control valve 25, the overflow valve 28 is opened, the flow of the urea solution passing through the flow control valve 25 is reduced, and at the moment, the redundant urea solution flows back to the urea tank N through the overflow valve 28, the third ball valve 6 and the third electromagnetic valve 5. If the flow rate measured by the flow sensor 26 is lower than the set value of the control system, the opening of the flow control valve 25 is increased to ensure that a sufficient amount of urea solution is passed.
When the urea pump station unit stops spraying, the first screw pump 13 or the second screw pump 18 stops running, the second electromagnetic valve 3 and the sixth electromagnetic valve 39 are closed, the urea solution and the auxiliary air are stopped being supplied, meanwhile, the fifth electromagnetic valve 35 is electrified to work, compressed air flows through the fifth electromagnetic valve 35, then passes through the urea purging pipeline, enters the urea spray gun nozzle after passing through the third one-way valve 45, the urea purging pipeline and the spray gun nozzle are washed by high-pressure air, and the residual urea solution is blown out of the urea spray gun nozzle, so that residual crystallization of the urea solution is avoided, the pipeline and the nozzle are prevented from being blocked, and the cleaning purpose is achieved.
If it is not necessary to read the compressed air gas flow, the tenth ball valve 29 and the eleventh ball valve 31 may be closed, the twelfth ball valve 32 may be opened, the fifteenth ball valve 41 and the sixteenth ball valve 43 may be closed, and the seventeenth ball valve 44 may be opened, so that sufficient compressed air may be provided.
And after the spray gun nozzle is closed and the purging is finished, all the electromagnetic valves are powered off, and all the ball valves are closed.
When not using this system for a long time, in order to prevent that urea solution from remaining the crystallization in transfer line, need wash urea solution pump station unit: and when the first ball valve 1, the fourth ball valve 8, the overflow valve 28, the first electromagnetic valve 1 and the fourth electromagnetic valve 7 are opened, the first screw pump 13 or the second screw pump 18 works to extract fresh water from the fresh water tank to flush the urea solution conveying pipeline, and the fresh water flows out of the fresh water tank, flows through the first check valve 22, the fourth pressure gauge 23, the second Y-shaped filter, the overflow valve 28, the fourth ball valve 8 and the fourth electromagnetic valve 7 and then flows back to the return water port of the fresh water tank.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A marine urea solution supply system, comprising: the device comprises a urea pump station unit, a compressed air supply unit and a urea spray gun unit; the compressed air supply unit further comprises a urea blowing unit and an auxiliary air atomization unit, the urea spray gun nozzle unit comprises a urea solution supply pipeline, a urea blowing pipeline and an auxiliary air atomization pipeline, and the urea solution supply pipeline is communicated with the urea pump station unit and is used for supplying urea solution to the urea spray gun nozzle unit; the urea purging pipeline is used for connecting the urea spray gun unit and the urea purging unit; and the auxiliary air atomization pipeline is used for connecting the urea spray gun unit and the auxiliary air atomization unit.
2. The marine urea solution supply system according to claim 1, wherein the urea pump station unit is constructed by: an outlet of the urea box is sequentially connected with an electromagnetic valve, a ball valve, a pressure gauge and a filter, then a loop is divided into two paths of completely same branches, each branch is provided with the ball valve, the screw pump and the ball valve, the screw pump is connected with the safety valve in parallel, and the pressure gauge is arranged on the loop where the safety valve is located; the outlets of the ball valves on the two branches are connected to form a main loop, and a check valve, a pressure gauge and a filter are arranged on the main loop; then the main loop is divided into two paths again, wherein the first path is provided with a flow control valve, a flow sensor, a pressure gauge and a ball valve, the ball valve is connected with a urea solution supply pipeline, and the interface is used for connecting the urea solution supply pipeline; the second path is continuously divided into two identical paths after being connected with an overflow valve, wherein one path is communicated with the urea tank, and a ball valve and an electromagnetic valve are arranged on the connecting pipeline; the other path is connected with a fresh water tank, a ball valve and an electromagnetic valve are arranged on the connecting pipeline, and the outlet of the electromagnetic valve is connected with a urea tank.
3. The marine urea solution supply system according to claim 2, wherein the urea pump station unit is constructed by: the outlet of the urea box is sequentially connected with a second electromagnetic valve, a second ball valve, a first pressure gauge, a first filter and a second pressure gauge, and then a loop is divided into two completely identical branches, wherein a fifth ball valve, a first screw pump and a sixth ball valve are arranged on the loop of the first branch; a seventh ball valve, a second screw pump and an eighth ball valve are arranged on the second loop; the first safety valve is connected with the first screw pump in parallel, the second safety valve is connected with the second screw pump in parallel, a third pressure gauge is arranged, and the fourth pressure gauge is used for testing the pressure of a loop where the first safety valve and the second safety valve are located respectively;
a first check valve, a fifth pressure gauge and a second filter are arranged on a main loop formed by connecting outlets of the sixth ball valve and the eighth ball valve on the two branches, and the main loop is divided into two paths, wherein a flow control valve, a flow sensor, the sixth pressure gauge and a ninth ball valve are arranged on the first path, and the ninth ball valve is connected with a urea solution supply pipeline interface which is used for connecting a urea solution supply pipeline; the second path is continuously divided into two identical paths after being connected with an overflow valve, wherein one path is communicated with the urea tank, and a third ball valve and a third electromagnetic valve are arranged on the connecting pipeline; the other path is connected with the fresh water tank, a fourth ball valve and a fourth electromagnetic valve are arranged on the connecting pipeline, and the outlet of the third electromagnetic valve is communicated with the urea tank; the outlet of the fresh water tank is connected with a first electromagnetic valve and a first ball valve, and the outlet of the first ball valve is connected with the outlet of a second ball valve;
preferably, the first filter and the second filter are both Y-shaped filters.
4. The marine urea solution supply system according to claim 1, wherein the compressed air supply unit is configured to: the outlet of the gas compressor is connected with a pipeline, the pipeline is sequentially provided with a ball valve, a flow meter, a ball valve and a pressure gauge, the other ball valve is connected in parallel with the pipeline where the ball valve, the flow meter and the ball valve are located, and then a loop is divided into two branches from the rear of the pressure gauge, wherein the first branch is provided with the ball valve and an electromagnetic valve and then is connected with a urea purging pipeline, and the two branches form a urea purging unit together; the second branch is sequentially provided with a ball valve, a pressure regulating valve, a pressure gauge and an electromagnetic valve; and then the electromagnetic valve is continuously connected with a flow switch, a ball valve, a flowmeter, a ball valve and an auxiliary air atomization pipeline, the ball valve, the flowmeter and the ball valve are sequentially arranged to form a flow monitoring device, and another ball valve is connected in parallel to the part of the pipeline where the flow monitoring device is located, so that an auxiliary air atomization unit is formed.
5. The marine urea solution supply system according to claim 4, wherein the compressed air supply unit is configured to: the outlet of the gas compressor is connected with a tenth ball valve, and then is connected with a first in-situ flow meter, an eleventh ball valve and a seventh pressure gauge, the twelfth ball valve is connected in parallel with the part of the pipeline where the tenth ball valve, the first in-situ flow meter and the eleventh ball valve are located, then the loop is divided into two branches from the rear of the pressure gauge, wherein the thirteenth ball valve and a fifth electromagnetic valve are arranged on the first branch and then are connected with a urea purging pipeline, and the three branches form a urea purging unit;
a fourteenth ball valve, a pressure regulating valve, an eighth pressure gauge and a sixth electromagnetic valve are arranged on the second branch, then the flow switch, the fifteenth ball valve, the second in-situ flow meter, the sixteenth ball valve and the auxiliary air atomization pipeline are connected, the seventeenth ball valve is connected in parallel with the fifteenth ball valve and the second in-situ flow meter on the pipeline of the part where the sixteenth ball valve is located, the inlet of the seventeenth ball valve is connected with the inlet of the fifteenth ball valve, the outlet of the seventeenth ball valve is connected with the outlet of the sixteenth ball valve, and the auxiliary air atomization unit is formed by the connection of the fourteenth ball valve, the pressure regulating; preferably, the flow meters are all in situ flow meters.
6. The marine urea solution supply system according to claim 1, wherein the urea spray gun unit is configured to: the urea solution supply pipeline is connected with the one-way valve and then connected to a liquid inlet of the urea spray gun unit, the one-way valve is arranged on a connecting pipeline of the urea blowing pipeline and the liquid inlet of the urea spray gun unit, and the auxiliary air atomization pipeline is connected with the fourth one-way valve and then connected to a gas inlet of the urea spray gun.
7. The marine urea solution supply system according to claim 6, wherein the urea spray gun unit is configured to: the urea solution supply pipeline is connected with the second one-way valve and then connected with a liquid inlet of the urea spray gun unit, a third one-way valve is arranged on a connecting pipeline of the urea purging pipeline and the liquid inlet of the urea spray gun unit, and the auxiliary air atomization pipeline is connected with the fourth one-way valve and then connected with a gas inlet of the urea spray gun.
8. Marine urea solution supply system according to any one of claims 1-7, characterised in that the urea solution supply line and the urea pump station unit are connected by a flange; the urea purging pipeline is connected with the urea spray gun unit and the urea purging unit through flanges; the auxiliary air atomization pipeline is connected with the urea spray gun unit and the auxiliary air atomization unit through flanges;
preferably, the urea nozzle spray gun adopts an internal mixing type air atomizing nozzle, the nozzle type is a porous solid cone, and more preferably, the spray cone angle of the nozzle is 60 degrees, and the spray is in constant pressure.
9. Marine urea solution supply system according to any one of claims 1-7, characterised in that the valves are connected by pipes and that the pipe connections are flanged.
10. Use of a marine urea solution supply system according to any one of claims 1-9 in a marine vessel, preferably for treatment of marine nitrogen oxide containing tail gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910988420.8A CN110714818A (en) | 2019-10-17 | 2019-10-17 | Marine urea solution supply system and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910988420.8A CN110714818A (en) | 2019-10-17 | 2019-10-17 | Marine urea solution supply system and application thereof |
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| CN110714818A true CN110714818A (en) | 2020-01-21 |
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| CN201910988420.8A Pending CN110714818A (en) | 2019-10-17 | 2019-10-17 | Marine urea solution supply system and application thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112177719A (en) * | 2020-09-21 | 2021-01-05 | 南京依柯卡特排放技术股份有限公司 | Tail gas purification control device and method for marine diesel engine |
| CN112253290A (en) * | 2020-11-04 | 2021-01-22 | 河南柴油机重工有限责任公司 | SCR control system and method for marine engine tail gas treatment |
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Application publication date: 20200121 |