Backwash filter control system

Abstract

The utility model discloses a backwash filter control system, and relates to the technical field of backwash filters. The detection unit and the control unit are additionally arranged on the backwashing filter system, so that remote automatic control on the conventional backwashing filter system is realized, the stamping pressure difference and the washing time can be remotely set, and the running conditions of the filter valve and the backwashing valve in the backwashing filter can be monitored in real time; the automatic degree of the backwash filter system is improved, the service life of the backwash filter system can be prolonged, the working efficiency is improved, and the problems of large workload, low working efficiency and the like of the existing manual washing scheme are solved. The backwashing filter control system provided by the utility model can be switched between a manual washing mode and an automatic washing mode, the automatic mode is used for normal production operation, filtration and backwashing control of the backwashing filter system, and the manual mode is mainly used for manual control during system debugging, maintenance and repair.

Description

Technical Field

[0001] The utility model relates to the technical field of backwashing filters, in particular to a control system for a backwashing filter. Background Art

[0002] At present, the raw material oil backwashing filter is manually controlled by on-site personnel. When the pressure difference before and after the filter reaches the flushing pressure difference, the operator flushes the filter manually on-site. This not only has a large workload and low work efficiency, but also requires the operator to observe the operation of the filter valve and the backwashing valve during the flushing process, without realizing automatic remote control, resulting in a high error probability and having a certain impact on the service life and work efficiency of the equipment.

[0003] Therefore, it is necessary to improve the current manual flushing scheme to overcome the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a control system for a backwashing filter, which can realize the automatic remote backwashing control of the backwashing filter and monitor the operation of the filter valve and the backwashing valve in the backwashing filter in real time, so as to solve the problems of large workload and low work efficiency existing in the current manual flushing scheme.

[0005] To achieve the above purpose, the utility model provides the following scheme:

[0006] The utility model provides a control system for a backwashing filter, including a backwashing filter system. A filter valve and a flushing valve are configured on any backwashing filter of the backwashing filter system. It is characterized in that it further includes:

[0007] A detection unit, including a valve position detection device and a differential pressure transmitter. The valve position detection device is arranged on any one of the filter valves and any one of the flushing valves. The differential pressure transmitter is connected between the inlet main pipeline and the outlet main pipeline of the backwashing filter system;

[0008] A control unit, including a PLC control system. The differential pressure transmitter, any one of the filter valves, any one of the flushing valves and any one of the valve position detection devices are all communicatively connected with the PLC control system.

[0009] Preferably, the control unit further includes a distributed control system communicatively connected with the PLC control system. The distributed control system can receive the parameters of the PLC control system and send instructions to the PLC control system.

[0010] Preferably, the PLC control system and the distributed control system are communicatively connected through an RS485 bus.

[0011] Preferably, the detection range of the differential pressure transmitter is 0 MPa to 0.6 MPa.

[0012] Preferably, the target detection value of the flushing pressure difference of the differential pressure transmitter is 0.05 MPa.

[0013] Preferably, the backwashing filter system further includes a steam tracing pipeline for preventing the filtering medium from solidifying.

[0014] Preferably, the backwashing filter system further includes instrument air, and the instrument air is used to provide a power source for the filtering valve and the flushing valve.

[0015] Preferably, an explosion-proof box is further included, and the PLC control system is arranged inside the explosion-proof box.

[0016] Preferably, any one of the filtering valves is a filtering valve with a built-in valve position detection function.

[0017] Preferably, any one of the flushing valves is a backwashing valve with a built-in valve position detection function.

[0018] The utility model has achieved the following technical effects compared with the prior art:

[0019] The backwashing filter control system proposed by the utility model realizes the remote automatic control of the existing backwashing filter system by adding a detection unit and a control unit to the backwashing filter system, can remotely set the stamping pressure difference and the flushing time, and can monitor the operation conditions of the filtering valve and the backwashing valve in the backwashing filter in real time, improves the automation degree of the backwashing filter system, can extend the service life of the backwashing filter system, improves the work efficiency, and solves the problems such as large workload and low work efficiency existing in the existing manual flushing scheme.

[0020] In addition, the backwashing filter control system proposed by the utility model can switch between a manual flushing mode and an automatic flushing mode. The automatic mode is used for the normal production operation, filtering and backwashing control of the backwashing filter system, and the manual mode is mainly used for manual control during system debugging, maintenance and repair.

[0021] In some technical solutions disclosed by the utility model, the PLC control system is installed in the explosion-proof box and is installed beside the on-site filter equipment during use. The explosion-proof box can improve the explosion-proof safety of the entire backwashing filter control system and can be used in explosion-proof occasions. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a structural view of the backwash filter control system disclosed in the embodiments of the present invention;

[0024] Figure 2 It is a control schematic diagram of the backwash filter control system disclosed in the embodiments of the present invention.

[0025] In the figure: 1. Backwash filter control system; 2. Backwash filter system; 3. Backwash filter; 4. Filter valve; 5. Flushing valve; 6. Differential pressure transmitter; 7. Inlet main pipeline; 8. Outlet main pipeline; 9. Steam tracing pipeline. Detailed implementation manners

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0027] The purpose of the present invention is to provide a backwash filter control system, which can realize the automatic remote backwash control of the backwash filter system and monitor the operation conditions of the filter valve and the backwash valve in the backwash filter in real time, so as to solve the problems such as large workload and low work efficiency existing in the existing manual flushing scheme.

[0028] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners.

[0029] Such as Figure 1As shown in the figure, this embodiment provides an anti-flushing filter control system 1, which includes an anti-flushing filter system 2, a detection unit, and a control unit. The anti-flushing filter system 2 is of an existing structure, such as a raw material oil anti-flushing filter system, a coal tar anti-flushing filter system, etc. A filter valve 4 and a flushing valve 5 are configured on any one of its anti-flushing filters 3; the detection unit includes a valve position detection device and a differential pressure transmitter 6. Valve position detection devices are provided on any one of the filter valves 4 and any one of the flushing valves 5, mainly used to detect the position feedback signals of the filter valve 4 and the flushing valve 5. The differential pressure transmitter 6 is connected between the inlet main pipeline 7 and the outlet main pipeline 8 of the anti-flushing filter system 2, mainly used to detect the pressure difference signal before and after the filter. The above control unit includes a PLC control system. The aforementioned differential pressure transmitter 6, any one of the filter valves 4, any one of the flushing valves 5, and any one of the valve position detection devices are all communicatively connected to the PLC control system. By adding a detection unit and a control unit to the anti-flushing filter system 2, the above anti-flushing filter control system 1 realizes remote automatic control of the existing anti-flushing filter system, can remotely set the stamping pressure difference and flushing time, and can monitor the operation of the filter valve and the backwashing valve in the anti-flushing filter in real time, which can extend the service life of the equipment, improve work efficiency, and solve the problems of large workload and low work efficiency existing in the existing manual flushing scheme.

[0030] In this embodiment, the control unit further includes a distributed control system communicatively connected to the PLC control system. The distributed control system can receive the parameters of the PLC control system and send instructions to the PLC control system. The distributed control system, that is, the Distributed Control System, abbreviated as DCS, refers to a new type of distributed control system that centrally operates, manages, monitors, and dispersedly controls the production process. The PLC control system of this embodiment preferably establishes communication with the distributed control system through the RS485 bus using the MODBUS RTU protocol; among them, the RS485 bus is a half-duplex asynchronous serial communication bus. During the automatic flushing process of the anti-flushing filter control system 1, the anti-flushing control system can be operated and monitored on the distributed control system. For example: the manual and automatic mode switching, setting parameters such as the flushing pressure difference and flushing time can be realized on the distributed control system. The distributed control system can send instructions to each electrical component such as the filter valve 4 and the flushing valve 5 through the PLC control system, and the electrical components will accept the instructions and execute actions. For example, for the filter valve 4 and the flushing valve 5, the distributed control system can send on-off instructions to the filter valve 4 and the flushing valve 5 through the PLC control system.

[0031] In this embodiment, the detection range of the differential pressure transmitter 6 is generally set to 0 MPa to 0.6 MPa. Specifically, taking the raw oil backwash filter system 2 as an example of the raw material oil backwash filter system, the target detection value of the backwash differential pressure of the differential pressure transmitter 6 is adjustable, and specifically, it can be preferably 0.05 MPa. That is, when the differential pressure transmitter 6 detects that the differential pressure between the inlet main pipeline 7 and the outlet main pipeline 8 is 0.05 MPa, automatic flushing can be started.

[0032] In this embodiment, considering that the backwash filter system 2 mainly filters impurities in the raw material oil and the filter medium is prone to solidification, a steam tracing pipeline 9 is also provided in the backwash filter system 2. As Figure 1 shown by the dotted line, it is the layout path of the steam tracing pipeline 9.

[0033] In this embodiment, the above-mentioned backwash filter system 2 further includes instrument air, and the instrument air is used to provide a power source for the filter valve 4 and the flushing valve 5.

[0034] In this embodiment, the PLC control system generally includes a chip, a power supply module, a relay, a power control switch, etc. The PLC control system is preferably installed in an explosion-proof box and is installed beside the on-site filter equipment during use. The explosion-proof box can improve the explosion-proof safety of the entire backwash filter control system 1 and can be used in explosion-proof occasions.

[0035] In this embodiment, any of the above-mentioned filter valves 4 is preferably a filter valve with a built-in valve position detection function.

[0036] In this embodiment, any of the above-mentioned flushing valves 5 is a backwash valve with a built-in valve position detection function.

[0037] Next, taking the backwash filter system 2 as an existing raw material oil backwash filter system as an example, the operating principle of the above-mentioned backwash filter control system 1 will be specifically described.

[0038] As Figure 1 shown, XV-01, XV-03, XV-05, XV-07, XV-09, XV-11 are the filter valves 4 of the backwash filter system 2, and XV-02, XV-04, XV-06, XV-08, XV-10, XV-12 are the flushing valves 5 of the backwash filter system 2. The detection range of the differential pressure transmitter 6 is 0 MPa to 0.6 MPa, and the backwash differential pressure (adjustable) of this system is set to 0.05 MPa. The distributed control system operates and monitors the operating status of the backwash filter system 2 (i.e., the opening and closing of each filter valve and each flushing valve), modifies the time of each timer, and modifies the backwash differential pressure setting value through RS485 communication.

[0039] When the backwash filter system 2 operates normally, the raw material flows from the inlet main pipeline 7 through the filtration valves XV-01, XV-03, XV-05, XV-07, XV-09, and XV-11. The impurities in the oil product are removed by the backwash filter 3. After a long time of filtration, too many impurities accumulate on the filter screen of the backwash filter 3, resulting in too large a pressure difference before and after the filter and a decrease in filtration efficiency. At this time, backwashing is required. First, the filtration valves XV-01, XV-03, XV-05, XV-07, XV-09, and XV-11 need to be closed, and the flushing valves XV-02, XV-04, XV-06, XV-08, XV-10, and XV-12 are opened. The raw material oil will backwash the impurities on the backwash filter 3 and discharge them to the dirty oil pipeline through the flushing valves XV-02, XV-04, XV-06, XV-08, XV-10, and XV-12, and finally discharge them through the sewage outlet of the dirty oil pipeline. After the flushing is completed, the flushing valves XV-02, XV-04, XV-06, XV-08, XV-10, and XV-12 are closed, and the filtration valves XV-01, XV-03, XV-05, XV-07, XV-09, and XV-11 are opened to enter the normal filtration condition.

[0040] The above filtration valves XV-01, XV-03, XV-05, XV-07, XV-09, and XV-11 are normally open valves; the flushing valves XV-02, XV-04, XV-06, XV-08, XV-10, and XV-12 are normally closed valves.

[0041] Since the impurities in the raw material oil are filtered and the filtering medium is prone to solidification, the steam tracing pipeline 9 is added. Instrument air is the power source for each filtration valve and each flushing valve.

[0042] The control unit configured in this solution has a PLC control system and a distributed control system. Its control is divided into an automatic mode and a manual mode. The automatic mode is used for the normal production operation, filtration, and backwashing control of the backwash filter system 2, and the manual mode is mainly used for manual control during system debugging, maintenance, and repair.

[0043] Specific examples are used in this utility model to elaborate on the principles and implementation manners of this utility model. The description of the above embodiments is only used to help understand the method and its core idea of this utility model; at the same time, for those of ordinary skill in the art, according to the idea of this utility model, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to this utility model.

Claims

1. A backwash filter control system, comprising a backwash filter system, wherein any backwash filter of the backwash filter system is provided with a filter valve and a flushing valve, characterized in that: Also includes: A detection unit, comprising a valve position detection device and a differential pressure transmitter, wherein any one of the filter valves and any one of the flushing valves is provided with the valve position detection device, and the differential pressure transmitter is connected between the inlet main pipeline and the outlet main pipeline of the backwashing filter system; The control unit includes a PLC control system, and the differential pressure transmitter, any one of the filter valves, any one of the flushing valves and any one of the valve position detection devices are all communicatively connected to the PLC control system.

2. The backwash filter control system according to claim 1, characterized in that: The control unit also includes a distributed control system that is communicatively connected to the PLC control system, and the distributed control system is capable of receiving parameters of the PLC control system and issuing instructions to the PLC control system.

3. The backwash filter control system according to claim 2, characterized in that: The PLC control system and the distributed control system are connected via RS485 bus communication.

4. The backwash filter control system according to any one of claims 1 to 3, characterized in that: The detection range of the differential pressure transmitter is 0MPa to 0.6MPa.

5. The backwash filter control system according to claim 4, characterized in that: The target detection value of the flushing pressure difference of the differential pressure transmitter is 0.05 MPa.

6. The backwash filter control system according to any one of claims 1 to 3, characterized in that: The backwash filter system also includes a steam tracing line to prevent the filter media from solidifying.

7. The backwash filter control system according to any one of claims 1 to 3, characterized in that: The backwash filter system further comprises instrument air, and the instrument air is used to provide a power source for the filter valve and the flush valve.

8. The backwash filter control system according to any one of claims 1 to 3, characterized in that: It also includes an explosion-proof box, and the PLC control system is arranged inside the explosion-proof box.

9. The backwash filter control system according to any one of claims 1 to 3, characterized in that: Any of the filter valves is a filter valve with a built-in valve position detection function.

10. The backwash filter control system according to any one of claims 1 to 3, characterized in that: Any of the flushing valves is a backwashing valve with a built-in valve position detection function.

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