CN110318850A - A kind of urea cycle system in SCR system - Google Patents
A kind of urea cycle system in SCR system Download PDFInfo
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- CN110318850A CN110318850A CN201910489147.4A CN201910489147A CN110318850A CN 110318850 A CN110318850 A CN 110318850A CN 201910489147 A CN201910489147 A CN 201910489147A CN 110318850 A CN110318850 A CN 110318850A
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- urea
- liquid level
- tank
- pump
- control 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
- 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
- F01N3/18—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
- 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
- F01N2610/1433—Pumps
- F01N2610/144—Control thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The present invention provides a kind of urea cycle systems in SCR system, it includes urea pump, cabin for stored urea, for maintaining pressure balanced connecting tube and several urea tanks for being connected with generator one-to-one correspondence, the cabin is connected with the input terminal of the urea pump, each urea tank is connected with the output end of the urea pump respectively, and each urea tank be connected with each other by the connecting tube it is logical, high liquid level control device and low liquid level control device are provided in the urea tank, the high liquid level control device, the low liquid level control device is electrically connected with the switch of the urea pump respectively.The urea cycle system can automatically control the supply and stopping of urea pump, reliably be controlled with the dosage to urea, and prevent the waste of resource, and can effectively avoid equipment as long time running and caused by excessive loss.
Description
Technical field
The present invention relates to a kind of after-treatment system fields more particularly to a kind of in SCR system of generator discharge
Urea cycle system.
Background technique
SCR technology (SCR) is for NO in exhaust gas from diesel vehicle dischargeXA treatment process, that is, urging
Under the action of agent, reducing agent ammonia or urea are sprayed into, the NO in tail gasXIt is reduced into N2And H2O, the technology are also answered extensively
It is post-processed for diesel engine vent gas, by optimization oil spout and combustion process, the generation of particle PM is controlled as far as possible in machine, is then existed
The nitrogen oxides formed under off engine control technology excess oxygen, with urea for vehicle, (urea for vehicle decomposes generation at a certain temperature in time
Ammonia) to nitrogen oxides (NOX) selective catalytic reduction is carried out, to achieve the purpose that not only energy conservation but also emission reduction.The urea of SCR system
Devices, the urea tanks such as generator, urea cabin, urea pump and urea tank have been generally included in the circulatory system and has been also known as urea box, have been used for
Stored urea solution, the major function of urea pump are the urea liquids in extracted urea case and keep certain pressure, are conveyed
To injection unit, the discharge capacity of urea pump employed in general generator is 900L/h, the number provided according to generator producer
According to urea consumption is the 9% of generator load, is calculated by 100% load of generator, and practical urea consumption is 12L/h, and single
The discharge capacity of urea pump reaches 900L/h, and the discharge capacity of urea pump is obviously bigger than normal, causes the state that supply exceed demand.
Urea pump in existing generator SCR system is by 24 hours ceaselessly transport urea to urea tube, system
In extra not used urea can then be returned in urea cabin and be collected by return line flow, so recycled, this mistake
Operation hours is long in journey, it is big to be lost, to cause the waste of resource.
Summary of the invention
Based on above-mentioned the deficiencies in the prior art, the purpose of the present invention is to provide a kind of urea in SCR system to follow
Loop system, the urea cycle system can automatically control the supply and stopping of urea pump, be carried out with the dosage to urea reliable
Control, and prevents the waste of resource, and can effectively avoid equipment as long time running and caused by excessive loss.
Based on this, the technical solution of the present invention is as follows: a kind of urea cycle system in SCR system comprising urea
Pump, for the cabin of stored urea, for maintaining pressure balanced connecting tube and several are used for and generator corresponds
The urea tank being connected, the cabin are connected with the input terminal of the urea pump, each urea tank respectively with the urea
The output end of pump is connected, and each urea tank is connected with each other logical by the connecting tube, is provided with height in the urea tank
Fluid level control device and low liquid level control device, the high liquid level control device, the low liquid level control device respectively with it is described
The switch of urea pump is electrically connected.
Optionally, the output end of the urea pump be equipped with output channel, each urea tank respectively with the output channel
It is connected.
Optionally, the first control valve is provided at the position of the urea pump on the output channel
Optionally, drainage tube is provided between the urea pump and the urea cabin, the first end of the drainage tube connects
It passes through on the output channel at the position of the urea pump, the second end of the drainage tube is connected with the urea cabin
It is logical.
Optionally, the second control valve is provided on the drainage tube.
Optionally, first control valve and second control valve are proportioning valve.
Optionally, the mounting height of each urea tank is identical, and is located in same level.
Optionally, the high liquid level control device includes the first floating ball lever meter and the first controller being electrically connected to each other,
The low liquid level control device includes the second floating ball lever meter and second controller being electrically connected to each other, first controller,
The second controller is electrically connected with the switch of the urea pump respectively.
Optionally, the urea cycle system in SCR system further include for maintaining pressure balanced connecting tube,
The bottom of each urea tank is connected with the connecting tube respectively.
It optionally, further include water tank and for being arranged in open deck for the urea cycle system in SCR system
Snorkel, each urea tank is connected with the snorkel respectively, and the exhaust outlet of the snorkel protrudes into the water storage
Under liquid level in tank.
The implementation of the embodiments of the present invention has the following beneficial effects:
The urea cycle system in SCR system of the invention include urea pump, for stored urea cabin, be used for
Maintain pressure balanced connecting tube and several urea tanks for being connected with generator one-to-one correspondence, the cabin and institute
The input terminal for stating urea pump is connected, and each urea tank is connected with the output end of the urea pump respectively, and each urine
Plain tank be connected with each other by the connecting tube it is logical, be provided in the urea tank high liquid level control device and low liquid level control dress
It sets, the high liquid level control device, the low liquid level control device are electrically connected with the switch of the urea pump respectively.Cabin as a result,
Body can provide urea liquid for urea pump and be conveyed, and urea liquid is delivered in each urea tank by urea pump, for power generation
Machine is consumed when working, and the consumption of general urea is the 9% of generator load, is calculated according to 100% load of generator, is urinated
The discharge capacity of element pump is also obvious bigger than normal, and the urea liquid in urea tank is be easy to cause to overflow, it is of the invention in, using connecting tube by each urine
Plain tank connection, uses siphon principle, so that the pressure in each urea tank is consistent, effectively ensures the solution in each urea tank
Height can be consistent, and then the automatic control for entire urea cycle system provides reliable basis.It is arranged in urea tank
Low liquid level control device and high liquid level control device, since the solution height in each urea tank is consistent with each other, then its respective height
Fluid level control device and low liquid level control device can monitor in real time the urea liquid in urea tank, and be not in
Deviation, when low liquid level control device detects that the urea liquid in urea tank is in low liquid level, then the liquid level in each urea pump
It is in low liquid level, low liquid level control device can automatically open the switch of urea pump at this time, from urea pump into urea tank
Carry out the supply of urea；When high liquid level control device detects that the urea liquid in urea tank is excessive, there are when the risk of spilling,
Liquid level in each urea pump is in high liquid level, then high liquid level control device can active control urea pump stop working, no longer
Into urea tank carry out urea liquid supply, further realize the low level of entire urea cycle system feed automatically and a high position
The function of pump trip improves the degree of automation of whole system, removes the work for feeding solution for urea tank manually in later period from,
While mitigating the labor intensity of staff, the flexible working condition for controlling urea pump avoids do not stop for urea pump 24 hours
Transport urea, prevent operation hours is too long from causing to be lost excessive, and the urea energy can be saved, and guarantee urea tank
To the reliability of solution supply, work quality is improved.
Detailed description of the invention
Fig. 1 is the principle schematic diagram of the urea cycle system in the SCR system of the prior art；
Fig. 2 is the principle schematic diagram described in the embodiment of the present invention for the urea cycle system in SCR system；
Fig. 3 is the structure arrangement schematic diagram described in the embodiment of the present invention for the urea cycle system in SCR system.
Description of symbols:
1, urea pump, 2, cabin, 3, urea tank, 4, generator, 5, high liquid level control device, the 51, first floating ball lever meter,
52, the first controller, 6, low liquid level control device, the 61, second floating ball lever meter, 62, second controller, 7, output channel, 8,
First control valve, 9, drainage tube, the 10, second control valve, 20, connecting tube, 30, water tank, 40, snorkel, 50, overflow pipe.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that, the orientation or position of the instructions such as term " on ", "lower", "left", "right"
Setting relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplification of the description, rather than
The device or element of indication or suggestion meaning must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot
It is interpreted as limitation of the present invention.
It is the structure principle chart of the urea cycle system of the prior art referring to Fig. 1, the discharge capacity of 4 urea pump 1 of generator is
900L/h, according to the data that 4 producer of generator provides, urea consumption is the 9% of 4 load of generator, according to generator
4100% load is calculated, and practical urea consumption is 12L/h, and the discharge capacity of single urea pump 1 can reach 900L/h, urea
Supply amount is obviously bigger than normal.In the urea cycle system, the urea liquid in the urea tank 3 of three generators 4 is unable to reach together
One horizontal plane, i.e. liquid level in urea tank 3 are inconsistent, and the solution being easy to appear in one of urea tank 3 has overflowed, and
Solution in other urea tank 3 also the low liquid level warning the phenomenon that, causes whole system can not be successfully and works.In this set
In system, the urea liquid in each urea tank 3 also passes through overflow pipe 50 and is communicated in the cabin 2 for containing urea liquid, to make
Obtaining urea liquid can be recycled, but on the one hand, urea tank 3 itself is simultaneously not belonging to pressure vessel, therefore urea pump 1
The excessive urea liquid for being supplied to urea tank 3 can not consume, and the position lowest part of cabin 2 is higher than urea tank 3
Highest point, will cause urea liquid and be unable to gravity reflux reboard, a large amount of urea liquid accumulates in urea tank 3 and is merely able to cause
Pressure in phase is excessive and causes to overflow, and ammonia itself has stronger volatility, and urea liquid spilling is easy to cause urea to exist
Volatilization, influences the physical and mental health and safety of staff in cabin, and cause the waste of solution in cabin；If urea liquid can
It smoothly returns in urea cabin, then urea pump 1 needs 24 hours ceaselessly transport urea solution, and it is long that this will cause urea pump 1 again
Time operating causes to be lost excessive, and waste of resource.
Referring to figs. 2 and 3, include for the urea cycle system in SCR system described in the preferred embodiment of the present invention
Urea pump 1, for the cabin 2 of stored urea, for maintaining pressure balanced connecting tube 20 and several are used for and generator 4
The urea tank 3 being connected is corresponded, the cabin 2 is connected with the input terminal of the urea pump 1, and each urea tank 3 is divided
Be not connected with the output end of the urea pump 1, and each urea tank 3 be connected with each other by the connecting tube 20 it is logical, it is described
High liquid level control device 5 and low liquid level control device, the high liquid level control device 5, the low liquid level are provided in urea tank 3
Control device is electrically connected with the switch of the urea pump 1 respectively.In the present embodiment, the quantity of urea tank 3 is preferably three.
Based on the above structure, the urea cycle system in SCR system of the invention during the work time, urea pump 1
Urea liquid in cabin 2 is extracted and certain pressure is kept to be delivered in each urea tank 3, three urea tanks 3 are in parallel
It is connected to the output of urea pump 1, each one-to-one correspondence of urea tank 3 is communicated with corresponding generator 4, so as in generator
Catalysis reduction work is carried out to offer urea liquid in 4 course of work, three urea pumps 1 are interconnected by connecting tube 20,
According to the principle of siphon, the pressure in three urea tanks 3 can be consistent, thus the urea liquid energy in three urea tanks 3
It is enough maintained on sustained height, the liquid level in three urea tanks 3, which is consistent, to be the automatic of the urea cycle system
Control provides reliable precondition, and the high liquid level control device 5 and low liquid level control device of the inside setting of urea tank 3 are equal
It can be realized the real time monitoring to the urea liquid in urea tank 3, when the liquid height in urea tank 3 reaches high liquid level, touching
When hair high liquid level control device 5 is worked, high liquid level control device 5 can automatically control urea pump 1 and stop working, can
The supply for stopping subsequent urea liquid prevents the solution in each urea tank 3 from overflowing；When the solution height in urea tank 3 reaches
When low liquid level, triggering low liquid level control device works, and low liquid level control device can automatically control the starting of urea pump 1, opens
Begin to provide solution into each urea tank 3, prevents catalysis reaction not in time, thus effectively guarantee entire urea cycle system
Reliably working, can either be energy saving, urea pump continual work in 124 hours is in turn avoided, so that in each urea tank 3
Solution height can remain in usable range, and remove the work that later stage work personnel carry out solution supply manually from, have
The raising working efficiency of effect and the labor intensity for reducing staff.
Wherein, the output end of urea pump 1 is equipped with output channel 7, and each urea tank 3 is connected with output channel 7 respectively, convenient
Entire urea cycle system is installed and arranged, is provided with the first control at the position of urea pump 1 on output channel 7
Valve 8, the first control valve 8 flexibly can be delivered to the liquid inventory in each urea tank 3 by output channel 7, due to individually urinating
The discharge capacity of element pump 1 is in 900L/h, hence it is evident that and it is bigger than normal, have the defects that supply exceed demand, so the first control valve 8 can be to a certain degree
The upper discharge capacity for reducing the urea liquid that urea pump 1 exports avoids the occurrence of the phenomenon that amount of solution abruptly increase in urea tank 3 is overflowed.Urine
Drainage tube 9 is provided between element pump 1 and cabin 2, the first end of drainage tube 9 is connected on output channel 7 close to urea pump 1
At position, the second end of drainage tube 9 is connected with urea cabin, and 2 one side of cabin can provide urine for the input terminal of urea pump 1
Plain solution is supplied in urea tank 3, on the other hand, can receive urea liquid extra in output channel 7, drainage tube 9 plays
The effect for bypassing drainage backs into most urea in cabin 2 by drainage tube 9.The second control is provided on drainage tube 9
Valve 10 is controlled by the valve openings size to the second control valve 10, is disappeared according to the output power of generator 4100%
The number of the urea liquid of consumption is adjusted, and avoids excessive urea liquid from being delivered in urea tank 3 suddenly and causes to overflow, and first
Control valve 8 and the mutual cooperation of the second control valve 10 work, and can reliably be divided the urea liquid in output channel 7
Stream and control guarantee that urea pump 1 supplies the reliability of work to urea tank 3.It should be noted that in the present embodiment,
What the first control valve 8 and the second control valve 10 were all made of is proportioning valve, realizes that the throttling to flow controls in automatically controlled mode, root
According to the demand of real work, the valve port opening of proportioning valve is adjusted, to the fluid flow on entire output channel 7 and drainage tube 9
It carries out effective control to shunt, guarantees the reliability of whole system work, but in other embodiments, the first control valve 8 and the
The type of two control valves 10 is not limited by the present embodiment, when can suitably be selected according to actual needs, as long as energy
The enough effective control guaranteed to liquid inventory.
In addition, the mounting height of each urea tank 3 is identical, and is located in same level, can guarantee respectively in connecting tube 20
On the basis of pressure is identical in urea tank 3, further guarantee that the liquid in each urea tank 3 can be on sustained height, into one
Step avoid the occurrence of the liquid in some urea tanks 3 expire liquid and the liquid in some urea tanks 3 also in low alarm state, influence
Automatic control to 3 amount of solution of urea tank in whole system.The high liquid level control device 5 includes that first be electrically connected to each other floats
Ball liquidometer 51 and the first controller 52, low liquid level control device include the second floating ball lever meter 61 and second being electrically connected to each other
Controller 62, the first controller 52, second controller 62 are electrically connected with the switch of urea pump 1 respectively, the first floating ball lever meter 51
It being located at the high liquid level position in urea tank 3, the second floating ball lever meter 61 is located at the low liquid level position in urea tank 3,
When the liquid height in urea tank 3 reaches low liquid level, liquid level signal is passed to second controller by the second floating ball lever meter 61
62, by second controller 62 control urea pump 1 start, feed solution into each urea tank 3, when the solution in urea tank 3 gradually
Rise until the first floating ball lever meter 51 works and liquid level signal is simultaneously passed to the first controller 52 when reaching high liquid level, then the
One controller 52 control urea pump 1 stops working, so that the amount of solution in urea tank 3 is maintained at high liquid level position, avoids molten
Hydrorrhea goes out to cause to waste.
Further, the urea cycle system in SCR system of the invention further includes water tank 30 and for arranging
Snorkel 40 in open deck, each urea tank 3 is connected with snorkel 40 respectively, and the exhaust outlet of snorkel 40 protrudes into storage
Under liquid level in water pot 30, urea tank 3 is closed state, will have a direct impact on the defeated of solution when its internal air is more
Enter, since the volatility of ammonia is stronger, is easy to cause if long-time is contacted with air and the particularity such as rotten occur, so adopt
Air extra in urea tank 3 can be drawn with permeability cell, prevent the phenomenon that feeling suffocated in urea tank 3, guarantee solution
Normal input, and avoid solution rotten, permeability cell is guided at open overtime work and protruded into water tank 30, water tank 30 can
Effective sealing effect is played, the urea liquid in urea tank 3 can be isolated with air, prevents urea volatilization rotten,
And by the opening of permeability cell arrangement above deck, avoid urea volatilization in cabin to the physical and mental health of staff and safety
It impacts.The bottom of each urea tank 3 is connected with connecting tube 20 respectively, convenient for reliably guaranteeing the pressure in each urea tank 3
Consistent, the top of each urea tank 3 is connected with snorkel 40, convenient smoothly by gas pass-out extra in urea tank 3, keeps away
Exempt from the quality of influence urea liquid.
Of the invention includes urea pump 1, the cabin 2 for stored urea, use for the urea cycle system in SCR system
In the pressure balanced connecting tube 20 of maintenance and several for corresponding the urea tanks 3 being connected, the cabin with generator 4
Body 2 is connected with the input terminal of the urea pump 1, and each urea tank 3 is connected with the output end of the urea pump 1 respectively,
And each urea tank 3 is connected with each other logical by the connecting tube 20, is provided with high liquid level control device 5 in the urea tank 3
With low liquid level control device, the high liquid level control device 5, the low liquid level control device are opened with the urea pump 1 respectively
Powered-down connection.Cabin 2 can provide urea liquid for urea pump 1 and be conveyed as a result, and urea liquid is delivered to by urea pump 1
In each urea tank 3, for being consumed when the work of generator 4, the consumption of general urea is the 9% of 4 load of generator, according to
4100% load of generator is calculated, and the discharge capacity of urea pump 1 is also obvious bigger than normal, be easy to cause the urea liquid in urea tank 3 to overflow,
In the present invention, each urea tank 3 is connected to using connecting tube 20, uses siphon principle, so that the pressure in each urea tank 3 keeps one
It causes, effectively ensures that the solution height in each urea tank 3 can be consistent, and then be the automatic control of entire urea cycle system
Reliable basis is provided.Low liquid level control device and high liquid level control device 5 are set in urea tank 3, due in each urea tank 3
Solution height it is consistent with each other, then its respective high liquid level control device 5 and low liquid level control device can be in urea tanks 3
Urea liquid is monitored in real time, and is not in deviation, when low liquid level control device detects that the urea in urea tank 3 is molten
When liquid is in low liquid level, then the liquid level in each urea pump 1 is in low liquid level, and low liquid level control device can be beaten automatically at this time
The switch for opening urea pump 1 is carried out the supply of urea from urea pump 1 into urea tank 3；When high liquid level control device 5 detects urine
Urea liquid in plain tank 3 is excessive, and there are when the risk of spilling, the liquid level in each urea pump 1 is in high liquid level, then high liquid level
Control device 5 can active control urea pump 1 stop working, no longer into urea tank 3 carry out urea liquid supply, further
The low level of the entire urea cycle system of realization feed automatically and the function of high position pump trip, improve the automation of whole system
Degree removes the work for feeding solution for urea tank 3 manually in later period from, while mitigating the labor intensity of staff, flexibly
Control urea pump 1 working condition, avoid urea pump 124 hours ceaselessly transport urea prevents operation hours too long
It causes to be lost excessive, and the urea energy can be saved, and guarantee the reliability that urea tank 3 supplies solution, improve as received basis
Amount.
It should be understood that various information are described in the present invention using term " first ", " second " etc., but these information
It should not necessarily be limited by these terms, these terms are only used to for same type of information being distinguished from each other out.For example, not departing from the present invention
In the case where range, " first " information can also be referred to as " second " information, and similar, " second " information can also be referred to as
" first " information.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principle of the present invention, several improvement and deformations can also be made, these improvement and deformations are also considered as
Protection scope of the present invention.
Claims (10)
1. a kind of urea cycle system in SCR system, which is characterized in that including urea pump, for the cabin of stored urea
Body, for maintaining pressure balanced connecting tube and several are used to correspond the urea tanks being connected with generator, it is described
Cabin is connected with the input terminal of the urea pump, and each urea tank is connected with the output end of the urea pump respectively, and
Each urea tank is connected with each other logical by the connecting tube, and high liquid level control device and low liquid level are provided in the urea tank
Control device, the high liquid level control device, the low liquid level control device are electrically connected with the switch of the urea pump respectively.
2. the urea cycle system according to claim 1 in SCR system, which is characterized in that the urea pump
Output end is equipped with output channel, and each urea tank is connected with the output channel respectively.
3. the urea cycle system according to claim 2 in SCR system, which is characterized in that the output channel
It is upper to be provided with the first control valve at the position of the urea pump.
4. the urea cycle system according to claim 3 in SCR system, which is characterized in that the urea pump with
Drainage tube is provided between the urea cabin, the first end of the drainage tube is connected on the output channel close to the urine
At the position of element pump, the second end of the drainage tube is connected with the urea cabin.
5. the urea cycle system according to claim 4 in SCR system, which is characterized in that on the drainage tube
It is provided with the second control valve.
6. the urea cycle system according to claim 5 in SCR system, which is characterized in that first control
Valve and second control valve are proportioning valve.
7. the urea cycle system according to any one of claims 1 to 6 in SCR system, which is characterized in that each institute
The mounting height for stating urea tank is identical, and is located in same level.
8. the urea cycle system according to any one of claims 1 to 6 in SCR system, which is characterized in that described
High liquid level control device includes the first floating ball lever meter and the first controller being electrically connected to each other, the low liquid level control device packet
Include the second floating ball lever meter and second controller being electrically connected to each other, first controller, the second controller respectively with
The switch of the urea pump is electrically connected.
9. the urea cycle system according to claim 8 in SCR system, which is characterized in that further include water tank
With the snorkel for being arranged in open deck, each urea tank is connected with the snorkel respectively, and the ventilation
The exhaust outlet of pipe protrudes under the liquid level in the water tank.
10. the urea cycle system according to claim 9 in SCR system, which is characterized in that each urea tank
Bottom be connected respectively with the connecting tube, and the top of each urea tank is connected with the snorkel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910489147.4A CN110318850B (en) | 2019-06-05 | 2019-06-05 | Urea circulating system for SCR system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910489147.4A CN110318850B (en) | 2019-06-05 | 2019-06-05 | Urea circulating system for SCR system |
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| CN110318850B CN110318850B (en) | 2021-07-16 |
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| CN108374567A (en) * | 2018-03-13 | 2018-08-07 | 安徽国信建设集团有限公司 | A kind of biliquid single system air pressure energy storage slip casting machine and grouting process |
| WO2019101286A1 (en) * | 2017-11-21 | 2019-05-31 | Wärtsilä Finland Oy | A method of installing an exhaust gas scrubber system of a power plant in a marine vessel and an exhaust gas scrubber system for wet scrubbing of exhaust gas of a power plant in a marine vessel |
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| CN101503172A (en) * | 2009-03-05 | 2009-08-12 | 杭州圣合医疗器械成套有限公司 | Non-stop automatic supplying apparatus for pressure liquid |
| KR20140126898A (en) * | 2013-04-24 | 2014-11-03 | 현대중공업 주식회사 | UREA supply unit of Selective Catalyst Reduction system |
| CN204312169U (en) * | 2014-12-16 | 2015-05-06 | 天纳克（苏州）排放系统有限公司 | Urea injection system |
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| WO2019101286A1 (en) * | 2017-11-21 | 2019-05-31 | Wärtsilä Finland Oy | A method of installing an exhaust gas scrubber system of a power plant in a marine vessel and an exhaust gas scrubber system for wet scrubbing of exhaust gas of a power plant in a marine vessel |
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| CN110318850B (en) | 2021-07-16 |
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