A kind of central control device and method of more SCR systems
Technical field
The present invention relates to the central control devices and side of exhaust aftertreatment technical field more particularly to a kind of more SCR systems
Method.
Background technology
SCR technology (SCR) is widely used in diesel engine vent gas post-processing, is to be directed to diesel engine vent gas
Middle NOxA treatment process that is, under the effect of the catalyst reducing agent ammonia or urea are sprayed into, the NO in tail gasxIt is reduced into
N2And H2O。
SCR system uses compressed air assisted injection system, and urea injecting quantity is calculated according to exhaust emissions, empty by compression
Gas carries urea to nozzle, and urea is chemically reacted after nozzle jet atomization in catalytic muffler.
For automotive Diesel engine, the independently working of separate unit SCR system can complete exhaust aftertreatment, but for diesel oil
Generating set, it is necessary to more SCR system common operationals.In the prior art, diesel-driven generator is corresponded with SCR system,
Staff needs to patrol each SCR system cabinet to grasp overall condition, is inconvenient.
Invention content
It is an object of the invention to propose a kind of central control device and method of more SCR systems, can centralized control it is more
The urea of platform SCR system cabinet is supplied and operating mode.
For this purpose,
On the one hand, the present invention provides a kind of central control device of more SCR systems, including:More SCR systems, urea storage
Flow container, air compressor, dcs and general control system;
Urea fluid reservoir is connect with the urea box of every SCR system respectively by dispenser pump, and each urea box is respectively set
One the first liquid level sensor, first liquid level sensor are connect with filling pump signal by dcs, are distributed
Formula control system is used to control filling pump work according to the low liquid level signal of the first liquid level sensor, from urea fluid reservoir to urea
Case fills urea;
Air compressor is connect with the jet blower of baroceptor and every SCR system respectively, and dcs is used
In controlling air compressor work according to the air pressure signal of baroceptor, the air pressure of jet blower is maintained at preset level;
General control system is connect with dcs and every SCR system respectively by bus, for summarizing distribution
The information of formula control system and every SCR system and display.
Further, the central control device of more SCR systems further includes:Second liquid level sensor;
Second liquid level sensor is connect with dcs signal, urea fluid reservoir is set to, for monitoring urea
The liquid level of fluid reservoir, and feed back to dcs.
Wherein, the quantity of the dispenser pump is at least one;
The more dispenser pumps are connect with the urea fluid reservoir by reversal valve, wherein urea fluid reservoir and reversal valve
Input terminal connection, the more dispenser pumps connect with multiple output ends of reversal valve respectively.
Further, the central control device of more SCR systems further includes:Remote control terminal;
The remote control terminal is connect by network with the general control system, for remotely checking and controlling the master control
The information of system processed.
On the other hand, the present invention provides a kind of centralized control method of more SCR systems, is suitable for above-mentioned more SCR systems
Central control device;Including:
First liquid level sensor obtains the liquid level of urea box in SCR system;
If the liquid level is less than default liquid level, the first liquid level sensor sends out low liquid level to dcs
Signal;
Dcs receives the low liquid level signal that any first liquid level sensor is sent, then opens dispenser pump.
Further, the centralized control method of more SCR systems further includes:
Baroceptor obtains the air pressure level between the jet blower and air compressor of every SCR system;
If air pressure level is less than preset pressure, baroceptor sends out depression signal to dcs;
Dcs receives the depression signal of any baroceptor, then opens air compressor.
Further, the centralized control method of more SCR systems further includes:
Dcs and every SCR system are communicated by bus with general control system;
It is selected according to user, the general control system controls every SCR system in MANUAL CONTROL mode, automatic open-loop respectively
Switch in control model and automated closed-loop control model.
Further, the centralized control method of more SCR systems further includes:
General control system, by network communication, receives and executes the control instruction of remote control terminal with remote control terminal.
Beneficial effects of the present invention are:
More SCR systems are connected with urea fluid reservoir, level monitoring are carried out by dcs, in time
Urea, the storage of centralized control urea are supplemented from urea fluid reservoir to the urea box of SCR system cabinet;And by distributed AC servo system system
The information of system and SCR system cabinet focuses in general control system, is conveniently operated the unified inspection of personnel and control;The present invention is applicable in
In the tail gas clean-up of large-sized diesel unit, more SCR system cabinets can be placed on different location according to actual needs, but urea stores up
Flow container, dcs and general control system may be provided at the position for facilitating management, very convenient.
Description of the drawings
Fig. 1 is the structural schematic diagram of the central control device for more SCR systems that the embodiment of the present invention one provides;
Fig. 2 is the flow chart of the centralized control method of more SCR systems provided by Embodiment 2 of the present invention.
Specific implementation mode
For make present invention solves the technical problem that, the technical solution that uses and the technique effect that reaches it is clearer, below
The technical solution of the embodiment of the present invention will be described in further detail in conjunction with attached drawing, it is clear that described embodiment is only
It is a part of the embodiment of the present invention, instead of all the embodiments.
Embodiment one
The present embodiment provides a kind of central control devices of more SCR systems, including:More SCR systems 20, urea fluid reservoir
40, air compressor 60, dcs 10 and general control system 50.
Fig. 1 is the structural schematic diagram of the central control device for more SCR systems that the embodiment of the present invention one provides.Such as Fig. 1 institutes
Show, urea fluid reservoir 40 is connect with the urea box of every SCR system 20 202 respectively by dispenser pump 30, and each urea box 202 divides
Not She Zhi first liquid level sensor 203, first liquid level sensor 203 passes through dcs 10 and dispenser pump
30 signals connect, and dcs 10 is used to control dispenser pump 30 according to the low liquid level signal of the first liquid level sensor 203
Work fills urea from urea fluid reservoir 40 to urea box 202.As long as the first level sensing in any one SCR system 20
Device 203 sends out low liquid level signal, it is desirable that opens dispenser pump 30, then dcs 10 makes dispenser pump 30 keep it turning on shape
State.
Air compressor 60 is connect with baroceptor 70 and the jet blower of every SCR system 20 201 respectively, distribution control
System 10 processed is used to control air compressor 60 according to the air pressure signal of baroceptor 70 and work, by the air pressure of jet blower 201
It is maintained at preset level.
General control system 50 is connect with dcs 10 and every SCR system 20 respectively by bus, for converging
Information and the display of total score cloth control system 10 and every SCR system 20.
Further, the central control device of more SCR systems further includes the second liquid level sensor 80;Second liquid level
Sensor 80 is connect with 10 signal of dcs, is set to urea fluid reservoir 40, for monitoring urea fluid reservoir 40
Liquid level, and feed back to dcs 10.
Wherein, the quantity of the dispenser pump 30 is at least one;The more dispenser pumps 30 and the urea fluid reservoir 40
Connected by reversal valve, wherein urea fluid reservoir 40 is connect with the input terminal of reversal valve, the more dispenser pumps 30 respectively with change
It is connected to multiple output ends of valve.
Further, the central control device of more SCR systems further includes:Remote control terminal;The remote control terminal
It is connect with the general control system 50 by network, the information for remotely checking and controlling the general control system 50.
The present embodiment connects more SCR systems with urea fluid reservoir, and liquid level is carried out by dcs
Monitoring supplements urea, the storage of centralized control urea from urea fluid reservoir to the urea box of SCR system cabinet in time;And it will divide
Cloth control system and the information of SCR system cabinet focus in general control system, are conveniently operated the unified inspection of personnel and control;
The device is suitable for the tail gas clean-up of large-sized diesel unit, and more SCR system cabinets can be placed on different positions according to actual needs
It sets, but urea fluid reservoir, dcs and general control system may be provided at the position for facilitating management, it is very convenient.
Embodiment two
The present embodiment provides a kind of centralized control methods of more SCR systems, are suitable for more SCR systems of above-described embodiment
Central control device, the device are made of software and/or hardware, and this method is integrated in inside the control system of the device.
Fig. 2 is the flow chart of the centralized control method of more SCR systems provided by Embodiment 2 of the present invention.As shown in Fig. 2, should
Centralized control method includes the following steps:
S11, the first liquid level sensor obtain the liquid level of urea box in SCR system.
S12 judges that the liquid level is less than default liquid level, is to then follow the steps S13, does not otherwise execute any operation.
S13, the first liquid level sensor send out low liquid level signal to dcs.
S14, dcs receive the low liquid level signal that any first liquid level sensor is sent, then open filling
Pump.
More SCR systems are communicated with dcs, and low liquid level signal is sent out by respective first liquid level sensor,
Dispenser pump is opened in request, as long as dcs receives the request of the unlatching dispenser pump of any one SCR system, is then kept
Dispenser pump is in running order.
Further, the centralized control method of more SCR systems further includes:
S21, baroceptor obtain the air pressure level between the jet blower and air compressor of every SCR system.
S22, if air pressure level is less than preset pressure, baroceptor sends out low pressure letter to dcs
Number.
S23, dcs receive the depression signal of any baroceptor, then open air compressor.
Similarly, the air pressure of air compressor, the unified spray to more SCR systems of air compressor are monitored by baroceptor
Nozzle provides compressed air, controls the operating of air compressor according to the signal of baroceptor by dcs.
Further, the centralized control method of more SCR systems further includes:
S31, dcs and every SCR system are communicated by bus with general control system.
S32 is selected according to user, and the general control system controls every SCR system in MANUAL CONTROL mode, automatic respectively
Switch in open loop control mode and automated closed-loop control model.
S33, general control system, by network communication, receive with remote control terminal and the control for executing remote control terminal refer to
It enables.
General control system plays the role of data summarization and central controlled, may be arranged at far from SCR system and distributed controls
The place of system processed is controlled by special messenger and is monitored, and supports remote operation, facilitates management.
It should be noted that step S11-S14, step S21-S23, step S31-S33 are respectively independently executed, between each other
There is no sequencing.
The technical principle of the present invention is described above in association with specific embodiment.These descriptions are intended merely to explain the present invention's
Principle, and it cannot be construed to limiting the scope of the invention in any way.Based on the explanation herein, the technology of this field
Personnel would not require any inventive effort the other specific implementation modes that can associate the present invention, these modes are fallen within
Within protection scope of the present invention.