CN115773798A - Wedge-shaped flow meter maintenance system and method for coking - Google Patents
Wedge-shaped flow meter maintenance system and method for coking Download PDFInfo
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Abstract
The invention relates to a wedge-shaped flowmeter maintenance system and a method for coking, which comprise a positive-pressure end purging ring, a negative-pressure end purging ring, a return pipeline, a return pipe control valve and a process pump, wherein the process pipeline is sequentially provided with the process pump and a wedge-shaped flowmeter body, the positive-pressure end purging ring and the negative-pressure end purging ring are respectively arranged at the joint of a front pressure taking pipe, a rear pressure taking pipe and a flange of a double-flange differential pressure transmitter, the return pipeline is provided with the return pipe control valve, one end of the return pipeline is respectively connected with the positive-pressure end purging ring and the negative-pressure end purging ring, and the other end of the return pipeline is connected with the process pipeline at the front end of the process pump. The invention has the advantages that: a positive pressure end purging ring, a negative pressure end purging ring, a backflow pipeline and a backflow pipeline control valve are arranged on the basis of a traditional wedge-shaped flowmeter, so that online maintenance is realized; the mode before the reflux pump and the reflux emptying mode are provided, and operators can select according to the actual situation on site, so that the application range of the on-line maintenance of the wedge-shaped flowmeter is widened.
Description
Technical Field
The invention relates to the technical field of flow meter measurement in the coking industry, in particular to a wedge-shaped flow meter maintenance system and a wedge-shaped flow meter maintenance method for coking.
Background
A wedge-shaped flowmeter is largely used in a coal gas purification device in the coking industry for measuring the flow of a process medium, and is mainly used for measuring the flow of liquid containing a tar medium. Because the medium contains tar, crude benzene, naphthalene, ammonia water and oil residue, the selection of a flow measuring instrument is difficult, a wedge-shaped flowmeter and a double-flange type transmitter are usually selected under the condition, the problem of inaccurate measurement caused by the dirt of the medium can be solved by the mode, but the pressure taking mode of the double flanges is adopted, the liquid pressure taking requires the mode of installing the flange transmitter under the liquid (under the liquid and on the gas), the pressure taking pipe is often blocked by the mixture of the dirt tar, the naphthalene and the oil residue, the accurate measurement of the wedge-shaped flowmeter is influenced, maintenance personnel are often required to detach for cleaning operation, the off-line maintenance method can influence the operating rate of the gas purification device, and production stop maintenance is required under severe conditions.
The traditional wedge-shaped flow meter maintenance method for coking comprises the following steps:
1. due to the characteristic that a coal gas purification device in the coking industry contains dirty media such as tar, the condition that the measurement of the wedge-shaped flowmeter is inaccurate frequently occurs, the fault rate of the instrument is very high, the maintenance work of an instrument system becomes indispensable, the workload is large, and the use efficiency is low.
2. The existing traditional maintenance method is an off-line mode, and the instrument is required to stop working and be disassembled for off-line flushing. The continuous production of the process is influenced, the manual maintenance cost is increased, and the working efficiency is low.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a wedge-shaped flowmeter maintenance system and a wedge-shaped flowmeter maintenance method for coking.
In order to realize the purpose, the invention is realized by the following technical scheme:
a wedge-shaped flowmeter maintenance system for coking comprises a wedge-shaped flowmeter, wherein the wedge-shaped flowmeter comprises a double-flange differential pressure transmitter, a front pressure taking pipe, a rear pressure taking pipe, a positive pressure end capillary pipe, a negative pressure end capillary pipe and a wedge-shaped flowmeter body, the front pressure taking pipe is used for being connected with the positive pressure end of the double-flange differential pressure transmitter through the positive pressure end capillary pipe, the rear pressure taking pipe is used for being connected with the negative pressure end of the double-flange differential pressure transmitter through the negative pressure end capillary pipe, and the positive pressure end and the negative pressure end of the double-flange differential pressure transmitter both adopt a diaphragm mode to take pressure; the wedge-shaped flowmeter body comprises a wedge block and a measuring pipe, the wedge block is arranged in the measuring pipe, and the measuring pipe is connected with the process pipeline through a flange;
the process pump is characterized by further comprising a positive-pressure end purging ring, a negative-pressure end purging ring, a backflow pipeline, a backflow control valve and a process pump, wherein the process pipeline is sequentially provided with the process pump and a wedge-shaped flowmeter body, the joint of the front pressure taking pipe, the rear pressure taking pipe and a flange of the double-flange differential pressure transmitter is respectively provided with the positive-pressure end purging ring and the negative-pressure end purging ring, the backflow pipeline is provided with the backflow control valve, one end of the backflow pipeline is respectively connected with the positive-pressure end purging ring and the negative-pressure end purging ring, the other end of the backflow pipeline is connected with the process pipeline at the front end of the process pump, and the process pump and the backflow control valve are both connected with the PLC/DCS through ports.
The backflow pipeline comprises a positive pressure side backflow pipeline, a negative pressure side backflow pipeline, a back flushing steam pipeline I, a back flushing steam pipeline II and a low pressure side backflow pipeline I, one end of the positive pressure side backflow pipeline and one end of the negative pressure side backflow pipeline are respectively connected with a positive pressure end blowing ring and a negative pressure end blowing ring, and the other end of the positive pressure side backflow pipeline and the other end of the negative pressure side backflow pipeline are both connected with the process pipeline through the low pressure side backflow pipeline I;
the first blowback steam pipeline is connected with the negative pressure side return pipeline, the second blowback steam pipeline is connected with the positive pressure side return pipeline, and blowback steam is respectively introduced into the other end of the first blowback steam pipeline and the other end of the second blowback steam pipeline; the positive pressure end blowing ring and the negative pressure end blowing ring are provided with a plurality of blowing holes which are connected and converged on the return pipeline through pipelines.
The back flow control valve includes malleation side back flow control valve, negative pressure side back flow control valve, back flow control valve before the pump, malleation side back flow steam blowback valve, negative pressure side back flow steam blowback valve, malleation side return line is close to the malleation end and sweeps the ring and is provided with malleation side back flow control valve, negative pressure side return line is close to the negative pressure end and sweeps the ring and is provided with negative pressure side back flow control valve, low pressure side return line is close to the process line and is provided with back flow control valve before the pump, back flow steam line two is provided with malleation side back flow steam blowback valve, back flow steam line is provided with negative pressure side back flow steam blowback valve.
The steam blowoff device comprises a steam blowoff pipe, a low-pressure side return pipe I, a steam blowoff control valve, a blow-off groove return control valve, a steam blowoff pipe and a steam blowoff control valve, wherein the other end of the low-pressure side return pipe I is connected with the blow-off groove through the low-pressure side return pipe I; and the second low-pressure side return pipeline is provided with an emptying groove return control valve, and the steam blow-off pipeline is provided with a steam blowoff blow-off valve.
A wedge-shaped flowmeter maintenance system for coking comprises a wedge-shaped flowmeter, wherein the wedge-shaped flowmeter comprises a double-flange differential pressure transmitter, a front pressure taking pipe, a rear pressure taking pipe, a positive pressure end capillary pipe, a negative pressure end capillary pipe and a wedge-shaped flowmeter body, the front pressure taking pipe is used for being connected with the positive pressure end of the double-flange differential pressure transmitter through the positive pressure end capillary pipe, the rear pressure taking pipe is used for being connected with the negative pressure end of the double-flange differential pressure transmitter through the negative pressure end capillary pipe, and the positive pressure end and the negative pressure end of the double-flange differential pressure transmitter both adopt a diaphragm mode to take pressure; the wedge-shaped flowmeter body comprises a wedge block and a measuring pipe, the wedge block is arranged in the measuring pipe, and the measuring pipe is connected with the process pipeline through a flange;
still sweep the ring including the malleation end, the negative pressure end sweeps the ring, the backflow pipeline, back flow control valve, the unloading groove, the process line is provided with the wedge flowmeter body, preceding pressure taking pipe, back pressure taking pipe is provided with malleation end respectively with double flange differential pressure transmitter's flange junction and sweeps the ring and sweep the ring with the negative pressure end, the backflow pipeline is provided with the back flow control valve, the one end of backflow pipeline sweeps the ring with the malleation end respectively, the negative pressure end sweeps the ring and is connected, the other end and the unloading groove of backflow pipeline are connected, the back flow control valve passes through the port with PLC DCS system and is connected.
The backflow pipeline comprises a positive pressure side backflow pipeline, a negative pressure side backflow pipeline, a back-blowing steam pipeline I, a back-blowing steam pipeline II, a low pressure side backflow pipeline II and a steam sewage pipeline, one end of the positive pressure side backflow pipeline and one end of the negative pressure side backflow pipeline are respectively connected with a positive pressure end blowing ring and a negative pressure end blowing ring, the other end of the positive pressure side backflow pipeline and the other end of the negative pressure side backflow pipeline are both connected with the low pressure side backflow pipeline II, and the other end of the low pressure side backflow pipeline II is connected with the emptying groove;
the first back-blowing steam pipeline is connected with the negative pressure side return pipeline, the second back-blowing steam pipeline is connected with the positive pressure side return pipeline, the steam sewage pipeline is connected with the second low pressure side return pipeline, back-blowing steam is respectively introduced into the other end of the first back-blowing steam pipeline and the other end of the second back-blowing steam pipeline, and the other end of the steam sewage pipeline is used for steam sewage disposal; the positive pressure end sweeping ring and the negative pressure end sweeping ring are provided with a plurality of sweeping holes which are connected and converged to the return pipeline through pipelines.
The back flow control valve includes malleation side back flow control valve, negative pressure side back flow control valve, emptying groove backward flow control valve, malleation side back flow steam blowback valve, negative pressure side back flow steam blowback valve, steam blowback blowoff valve, malleation side return line is close to malleation end and sweeps the ring and be provided with malleation side back flow control valve, negative pressure side return line is close to negative pressure end and sweeps the ring and be provided with negative pressure side back flow control valve, low pressure side return line two is provided with emptying groove backward flow control valve, blowback steam line two is provided with malleation side back flow steam blowback valve, blowback steam line one is provided with negative pressure side back flow steam blowback valve, steam blowoff line sets up steam blowback blowoff valve.
A maintenance method of a wedge-shaped flowmeter for coking is characterized in that online maintenance of the wedge-shaped flowmeter is achieved through a backflow pipeline, a backflow pipeline control valve and a process pump, the backflow pipeline is subjected to timed steam purging, the maintenance method is a backflow pump front mode, process media in the process pipeline are pressurized and sent out through the process pump, the pressure of the front end of the process pump is lower than that of the front end of the wedge-shaped flowmeter, and therefore dirty media in the wedge-shaped flowmeter flow and flow back to the low pressure position; the PLC/DCS system controls a backflow pump front mode, the backflow pump front mode comprises a backflow cleaning maintenance mode I and a backflow pipe purging mode I, and the contents are as follows:
the first backflow cleaning maintenance mode comprises a first integral cleaning maintenance mode and a first independent cleaning maintenance mode, wherein the first integral cleaning maintenance mode is that the backflow maintenance of a front pressure tapping pipe and a back pressure tapping pipe is carried out simultaneously, and the backflow flushing maintenance time is consistent; the independent cleaning and maintenance is that the backflow maintenance of the front pressure tapping pipe and the backflow maintenance of the rear pressure tapping pipe are respectively carried out, the backflow flushing maintenance time is respectively set, and the content is as follows:
1) The integral cleaning and maintenance method comprises the following steps:
s111, a return pipe control state: opening a control valve of a negative pressure side return pipe, opening a control valve of a positive pressure side return pipe, opening a control valve of a pre-pump return pipe, and closing a return control valve of an emptying tank;
s112, setting the duration T1, wherein the T1 is given through an HMI (human machine interface);
2) The independent cleaning and maintaining step I comprises a front pressure taking end backflow cleaning step I and a rear pressure taking end backflow cleaning step I, and comprises the following steps:
s121, carrying out backflow cleaning on a front pressure taking end:
s1211 and controlling the valve state: closing a negative pressure side return pipe control valve, opening a positive pressure side return pipe control valve, opening a pre-pump return pipe control valve, and closing an emptying tank return pipe control valve;
s1212, duration T2, T2 is given through an HMI human-machine interface;
s122, back pressure taking end backflow cleaning:
s1221, a valve control state: opening a negative pressure side return pipe control valve, closing a positive pressure side return pipe control valve, opening a pre-pump return pipe control valve, and closing an emptying tank return pipe control valve;
s1222, setting duration T3, T3 through an HMI human-machine interface;
(II) a return pipe purging mode I comprises the following steps:
s131, valve control state: opening a steam back-blowing valve of a positive pressure side return pipe, and opening a steam back-blowing valve of a negative pressure side return pipe;
s132, setting duration T4, wherein T4 is given through an HMI (human machine interface);
s133, valve control state: and closing the steam back-blowing valve of the positive pressure side return pipe, and closing the steam back-blowing valve of the negative pressure side return pipe.
A wedge-shaped flowmeter maintenance method for coking is characterized in that online maintenance of the wedge-shaped flowmeter is achieved by adding a return pipe, a return pipe control valve and an emptying tank, timing steam purging is conducted on the return pipe, the maintenance method is in a return emptying mode, the emptying tank is used for recycling leakage, overflow and leakage of process media in the production process, and the pressure in the emptying tank is zero, so that dirty media in the wedge-shaped flowmeter flow up and flow back to a low pressure position; the PLC/DCS system controls a backflow emptying mode, the backflow emptying mode comprises a backflow cleaning maintenance mode II and a backflow pipe purging mode II, and the contents are as follows:
the second backflow cleaning maintenance mode comprises a second integral cleaning maintenance mode and a second independent cleaning maintenance mode, wherein the second integral cleaning maintenance mode is that the backflow maintenance of the front pressure sampling pipe and the backflow maintenance of the rear pressure sampling pipe are carried out simultaneously, and the backflow flushing maintenance time is consistent; the independent cleaning maintenance is that the backflow maintenance of the front pressure tapping pipe and the backflow maintenance of the rear pressure tapping pipe are respectively carried out, the backflow flushing maintenance time is respectively set, and the content is as follows:
1) And the integral cleaning and maintenance step II comprises the following steps:
s211, a valve control state: opening a control valve of a negative pressure side return pipe, opening a control valve of a positive pressure side return pipe, closing a control valve of a pre-pump return pipe, and opening a return valve of an emptying tank;
s212, setting duration T5, T5 through an HMI human-machine interface;
2) And the independent cleaning and maintenance step two comprises a front pressure taking end backflow cleaning step two and a rear pressure taking end backflow cleaning step two, and the contents are as follows:
s221, carrying out backflow cleaning on a front pressure taking end, and comprising the following steps:
s2211, valve control state: closing a negative pressure side return pipe control valve, opening a positive pressure side return pipe control valve, closing a pre-pump return pipe control valve, and opening an emptying groove return pipe control valve;
s2212, setting duration T6 and T6 through an HMI human-machine interface;
s222, back pressure taking end backflow cleaning is performed, and the steps are as follows:
s2221, valve control state: opening a control valve of a negative pressure side return pipe, closing a control valve of a positive pressure side return pipe, closing a control valve of a pre-pump return pipe, and opening a return control valve of an emptying groove;
s2222, duration T7, T7 is given through an HMI human-machine interface;
and (II) refluxing, purging and maintaining, wherein the steps are as follows:
s231, valve control state: opening a steam back-blowing valve of a positive-pressure side return pipe, opening a steam back-blowing valve of a negative-pressure side return pipe, and opening a steam back-blowing blowoff valve;
s232, setting duration T8, T8 through an HMI (human machine interface);
s233, valve control state: and closing the steam back-blowing valve of the positive-pressure side return pipe, closing the steam back-blowing valve of the negative-pressure side return pipe, and closing the steam back-blowing blowoff valve.
A maintenance method of a wedge-shaped flowmeter for coking comprises a reflux pump front mode and a reflux emptying mode, wherein the reflux pump front mode is that process media in a process pipeline are pressurized and delivered through a process pump, and the pressure at the front end of the process pump is lower than that at the front end of the wedge-shaped flowmeter, so that dirty media in the wedge-shaped flowmeter flow up and flow back to the position with low pressure; the backflow emptying mode is that an emptying groove is used for recovering leakage of process media in the production process, the pressure in the emptying groove is zero, so that dirty media in the wedge-shaped flowmeter flow and flow back to a low pressure position;
the operating personnel realizes the selection of the mode before the reflux pump and the backflow emptying mode through the switch action of the reflux control valve of the reflux pipe before the selective pump and the emptying tank, and the remote control is completed by the PLC/DCS system, and the content comprises the following steps:
the method comprises the following steps of (I) a backflow pump front mode comprising a backflow cleaning maintenance mode I and a backflow pipe purging mode I, wherein the contents are as follows:
the first backflow cleaning maintenance mode comprises a first integral cleaning maintenance mode and a first independent cleaning maintenance mode, wherein the first integral cleaning maintenance mode is that the backflow maintenance of a front pressure tapping pipe and a back pressure tapping pipe is carried out simultaneously, and the backflow flushing maintenance time is consistent; the independent cleaning and maintenance is that the backflow maintenance of the front pressure tapping pipe and the backflow maintenance of the rear pressure tapping pipe are respectively carried out, the backflow flushing maintenance time is respectively set, and the content is as follows:
1) The method comprises the following steps of integral cleaning and maintenance:
s111, a return pipe control state: opening a negative pressure side return pipe control valve, opening a positive pressure side return pipe control valve, opening a pre-pump return pipe control valve, and closing an emptying tank return pipe control valve;
s112, setting the duration T1, wherein the T1 is given through an HMI (human machine interface);
2) The independent cleaning and maintaining step I comprises a front pressure taking end backflow cleaning step I and a rear pressure taking end backflow cleaning step I, and comprises the following steps:
s121, carrying out backflow cleaning on a front pressure taking end:
s1211 and controlling the valve state: closing a negative pressure side return pipe control valve, opening a positive pressure side return pipe control valve, opening a pre-pump return pipe control valve, and closing an emptying tank return pipe control valve;
s1212, setting duration time T2, T2 through an HMI (human machine interface);
s122, back pressure taking end backflow cleaning:
s1221, valve control state: opening a control valve of a negative pressure side return pipe, closing a control valve of a positive pressure side return pipe, opening a control valve of a pre-pump return pipe, and closing a return control valve of an emptying tank;
s1222, setting duration T3, T3 through an HMI human-machine interface;
(II) a return pipe purging mode I comprises the following steps:
s131, valve control state: the steam back-flushing valve of the positive pressure side return pipe is opened, the steam back-flushing valve of the negative pressure side return pipe is opened, and the steam opening blow-down valve 19 is closed;
s132, setting duration T4, T4 through an HMI (human machine interface);
s133, valve control state: closing a steam back-flushing valve of a positive-pressure side return pipe, closing a steam back-flushing valve of a negative-pressure side return pipe, and opening a drain valve by steam to close;
(II) a backflow emptying mode which comprises a backflow cleaning maintenance mode II and a backflow pipe purging mode II, and the contents are as follows:
the second backflow cleaning maintenance mode comprises a second integral cleaning maintenance mode and a second independent cleaning maintenance mode, wherein the second integral cleaning maintenance mode is that the backflow maintenance of the front pressure sampling pipe and the backflow maintenance of the rear pressure sampling pipe are carried out simultaneously, and the backflow flushing maintenance time is consistent; independent cleaning maintenance two is that the backward flow of preceding pressure pipe and back pressure pipe is safeguarded and is carried out respectively, and the time of backward flow washing maintenance sets up respectively, and the content is as follows:
1) And the integral cleaning and maintenance step II comprises the following steps:
s211, a valve control state: opening a control valve of a negative pressure side return pipe, opening a control valve of a positive pressure side return pipe, closing a control valve of a pre-pump return pipe, and opening a return valve of an emptying tank;
s212, setting the duration T5, wherein T5 is given through an HMI (human machine interface);
2) And the independent cleaning mode II comprises a front pressure taking end backflow cleaning II and a rear pressure taking end backflow cleaning II, and the contents are as follows:
s221, carrying out backflow cleaning on a front pressure taking end, and comprising the following steps:
s2211, valve control state: closing a negative pressure side return pipe control valve, opening a positive pressure side return pipe control valve, closing a pre-pump return pipe control valve, and opening an emptying groove return pipe control valve;
s2212, setting duration T6 and T6 through an HMI human-machine interface;
s222, back pressure taking end backflow cleaning is performed, and the steps are as follows:
s2221, a valve control state: opening a control valve of a negative pressure side return pipe, closing a control valve of a positive pressure side return pipe, closing a control valve of a pre-pump return pipe, and opening a return control valve of an emptying groove;
s2222, duration T7, T7 is given through an HMI human-machine interface;
and (II) refluxing, purging and maintaining, which comprises the following steps:
s231, valve control state: opening a steam back-blowing valve of a positive-pressure side return pipe, opening a steam back-blowing valve of a negative-pressure side return pipe, and opening a steam back-blowing blowoff valve;
s232, setting duration T8, T8 through an HMI (human machine interface);
s233, valve control state: and closing the steam back-blowing valve of the positive-pressure side return pipe, closing the steam back-blowing valve of the negative-pressure side return pipe and closing the steam back-blowing blowoff valve.
Compared with the prior art, the invention has the beneficial effects that:
1. the traditional off-line maintenance method is changed, and the positive pressure end purging ring, the negative pressure end purging ring, the backflow pipeline and the backflow pipeline control valve are arranged on the basis of the traditional wedge-shaped flowmeter, so that on-line maintenance is realized;
2. the mode before the reflux pump and the reflux emptying mode are provided, and an operator selects according to the actual situation on site, so that the application range of the on-line maintenance of the wedge-shaped flowmeter is expanded;
3. an operator can check the running state of the equipment at any time through the HMI human-computer interface;
4. through the simple transformation to traditional wedge flowmeter, easy operation easily promotes.
Drawings
FIG. 1 is a schematic diagram of a wedge flow meter maintenance system for coking.
FIG. 2 is a flow chart of an online maintenance method for a wedge flow meter for coking.
In the figure: 1-measuring pipe 2-front pressure taking pipe 3-positive pressure end blowing ring 4-positive pressure end 5 of double-flange differential pressure transmitter-back pressure taking pipe 6-negative pressure end blowing ring 7-negative pressure end 8 of double-flange differential pressure transmitter-double-flange differential pressure transmitter 9-positive pressure end capillary 10-negative pressure end capillary 11-positive pressure side return pipe control valve 12-negative pressure side return pipe control valve 13-pre-pump return pipe control valve 14-blow off tank return flow control valve 15-process pump 16-blow off tank 17-positive pressure side return pipe steam back blowing valve 18-negative pressure side return pipe steam back blowing valve 19-steam back blowing valve 20-timing start maintenance module 21-return blow-off maintenance module 22-return pump pre-maintenance module 23-automatic maintenance recovery module 24-return pipe blowing module 25-wedge 26-positive pressure side return pipe 27-negative pressure side return pipe 28-back blowing steam pipe one 29-low pressure side return pipe one 30-low pressure side return pipe two 31-back blowing steam pipe 32-back blowing steam pipe two.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings, but it should be noted that the present invention is not limited to the following embodiments.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ example 1 ]
At traditional coking with wedge-shaped flowmeter's preceding pressure taking pipe 2, back pressure taking pipe 5 is provided with positive pressure end respectively with the flange joint department of two flange differential pressure transmitter 8 and sweeps ring 3 and negative pressure end and sweeps ring 6, it sweeps the ring 3 and all is provided with a plurality of purge holes on the negative pressure end sweeps ring 6 to sweep the ring 6 at the positive pressure end, collect the return line through the tube coupling on, the dirty medium gathering department in order to let the pressure taking pipeline also be the medium of two flange differential pressure transmitter 8's diaphragm department flows during the maintenance, the other end of return line need be connected to low pressure department, just can wash away the dirty medium of gathering itself by survey medium, thereby accomplish wedge-shaped flowmeter's online maintenance work.
Referring to fig. 1 and 2, a wedge-shaped flowmeter maintenance system for coking comprises a wedge-shaped flowmeter, wherein the wedge-shaped flowmeter comprises a double-flange differential pressure transmitter 8, a front pressure taking pipe 2, a rear pressure taking pipe 5, a positive pressure end capillary tube 9, a negative pressure end capillary tube 10, a wedge-shaped flowmeter body, a positive pressure end purging ring 3, a negative pressure end purging ring 6, a backflow pipeline, a backflow pipe control valve and a process pump 15, the backflow pipe control valve adopts a stop valve, the stop valve can adopt a pneumatic driving mode or an electric driving mode, the front pressure taking pipe 2 is used for being connected with a positive pressure end 4 of the double-flange differential pressure transmitter 8 through the positive pressure end capillary tube 9, the rear pressure taking pipe 5 is used for being connected with a negative pressure end 7 of the double-flange differential pressure transmitter 8 through the negative pressure end capillary tube 10, and the positive pressure end 4 and the negative pressure end of the double-flange differential pressure transmitter 8 adopt a diaphragm mode for pressure taking; the wedge-shaped flowmeter body comprises a wedge-shaped block 25 and a measuring pipe 1, wherein the wedge-shaped block 25 is arranged in the measuring pipe 1, and the measuring pipe 1 is connected with a process pipeline through a flange; the front pressure taking pipe 2 and the rear pressure taking pipe 5 are connected to the measuring pipe 125, respectively.
The process pipeline is sequentially provided with a process pump 15 and a wedge-shaped flowmeter body, the flange joints of the front pressure taking pipe 2, the rear pressure taking pipe 5 and the double-flange differential pressure transmitter 8 are respectively provided with a positive pressure end purging ring 3 and a negative pressure end purging ring 6, the return pipeline is provided with a return pipe control valve, one end of the return pipeline is respectively connected with the positive pressure end purging ring 3 and the negative pressure end purging ring 6, and the other end of the return pipeline is connected with the process pipeline at the front end of the process pump 15.
The backflow pipeline comprises a positive pressure side backflow pipeline 26, a negative pressure side backflow pipeline 27, a back flushing steam pipeline 28, a back flushing steam pipeline 32 and a low pressure side backflow pipeline I, one end of the positive pressure side backflow pipeline 26 and one end of the negative pressure side backflow pipeline 27 are respectively connected with the positive pressure end blowing ring 3 and the negative pressure end blowing ring 6, and the other end of the positive pressure side backflow pipeline 26 and the other end of the negative pressure side backflow pipeline 27 are connected with the process pipeline through the low pressure side backflow pipeline I29;
a first blowback steam pipeline 28 is connected with the negative pressure side return pipeline 27, a second blowback steam pipeline 32 is connected with the positive pressure side return pipeline 26, and blowback steam is respectively introduced into the other end of the first blowback steam pipeline 28 and the other end of the second blowback steam pipeline 32; the positive pressure end blowing ring 3 and the negative pressure end blowing ring 6 are provided with a plurality of blowing holes which are connected and converged on a return pipeline through pipelines.
The backflow pipe control valve comprises a positive pressure side backflow pipe control valve 11, a negative pressure side backflow pipe control valve 12, a pre-pump backflow pipe control valve 13, a positive pressure side backflow pipe steam blowback valve 17, a negative pressure side backflow pipe steam blowback valve 18, a positive pressure side backflow pipeline 26 is provided with the positive pressure side backflow pipe control valve 11 close to the positive pressure end purging ring 3, a negative pressure side backflow pipeline 27 is provided with the negative pressure side backflow pipe control valve 12 close to the negative pressure end purging ring 6, a low pressure side backflow pipeline 29 is provided with the pre-pump backflow pipe control valve 13 close to the process pipeline, a back blowing steam pipeline two 32 is provided with the positive pressure side backflow pipe steam blowback valve 17, and a back blowing steam pipeline 28 is provided with the negative pressure side backflow pipe steam blowback valve 18.
The wedge-shaped flow meter maintenance system for coking further comprises an emptying groove 16, a second low-pressure side return pipe and a steam blowdown pipeline 31, wherein the return pipe control valve further comprises an emptying groove return flow control valve 14 and a steam back-blowing blowdown valve 19, the other end of the first low-pressure side return pipe 29 is connected with the emptying groove 16 through the second low-pressure side return pipe 30, the steam blowdown pipeline 31 is connected with the second low-pressure side return pipe 30, and the other end of the steam blowdown pipeline 31 is used for steam blowdown; the second low-pressure side return pipeline 30 is provided with an emptying groove return flow control valve 14, and the steam blow-off pipeline 31 is provided with a steam blow-off valve 19; the process pump 15 and the return pipe control valve are connected with the PLC/DCS system through ports.
A maintenance method of a wedge-shaped flowmeter for coking comprises a reflux pump front mode and a reflux emptying mode, wherein the reflux pump front mode is that a process pump 15 is arranged at the front end of the wedge-shaped flowmeter, process media in a process pipeline are pressurized and sent out through the process pump 15, and the pressure at the front end of the process pump 15 is lower than that at the front end of the wedge-shaped flowmeter, so that dirty media in the wedge-shaped flowmeter flow up and flow back to the position with low pressure; in the backflow emptying mode, a backflow pipeline is connected with an emptying groove 16 of a coal gas purification area, the emptying groove 16 is used for recovering leakage of process media in the production process, the pressure in the emptying groove 16 is zero, the requirement of backflow differential pressure in the maintenance process of the wedge-shaped flowmeter is met, and the dirty media in the wedge-shaped flowmeter flow and flow back to a low pressure position; the operator selects the pre-pump return pipe mode and the return blowdown mode by selecting the switching operation of the pre-pump return pipe control valve 13 and the blowdown tank return pipe control valve 14. The backflow pump front mode and the backflow emptying mode both comprise a backflow cleaning maintenance mode and a backflow pipe purging mode, purging media in the backflow pipe purging mode are common steam in the gas purification device, and the backflow pipe purging mode is performed under the condition that the process device is stopped and overhauled and is used for completing purging work of a backflow pipeline. Because tar, naphthalene and other impurities in the medium can be removed under the high-temperature blowing of steam, no dirty medium is left in the return pipeline, and the preparation work is prepared for the next online maintenance. The steam purging completes the purging work of the return pipe through the combined action of the steam back-flushing valve 17 of the positive pressure side return pipe, the steam back-flushing valve 18 of the negative pressure side return pipe and the steam back-flushing blowoff valve 19. Wherein, the positive pressure side return pipe steam blowback valve 17 and the negative pressure side return pipe steam blowback valve 18 are arranged close to the positive pressure side return pipe control valve 11 and the negative pressure side return pipe control valve 12, so as to ensure the steam blowback effect; the PLC/DCS system realizes remote control, and the content comprises the following steps:
the method comprises the following steps that (I) a backflow pump front mode comprises a backflow cleaning maintenance mode I and a backflow pipe purging mode I, and the contents are as follows:
the first backflow cleaning maintenance mode comprises a first integral cleaning maintenance mode and a first independent cleaning maintenance mode, wherein the first integral cleaning maintenance mode is that the backflow maintenance of the front pressure tapping pipe 2 and the backflow maintenance of the rear pressure tapping pipe 5 are carried out simultaneously, and the backflow flushing maintenance time is consistent; the independent cleaning maintenance is that the backflow maintenance of the front pressure tapping pipe 2 and the backflow maintenance of the rear pressure tapping pipe 5 are respectively carried out, and the backflow flushing maintenance time is respectively set as follows:
1) The integral cleaning and maintenance method comprises the following steps:
s111, a return pipe control state: a negative pressure side return pipe control valve 12 is opened, a positive pressure side return pipe control valve 11 is opened, a pre-pump return pipe control valve 13 is opened, and a vent groove return pipe control valve 14 is closed;
s112, giving duration T1, T1 through an HMI (human machine interface);
2) The independent cleaning and maintaining step I comprises a front pressure taking end backflow cleaning step I and a rear pressure taking end backflow cleaning step I, and comprises the following steps:
s121, carrying out backflow cleaning on a front pressure taking end:
s1211 and controlling the valve state: closing a negative pressure side return pipe control valve 12, opening a positive pressure side return pipe control valve 11, opening a pre-pump return pipe control valve 13, and closing a blow-down tank return pipe control valve 14;
s1212, duration T2, T2 is given through an HMI human-machine interface;
s122, back pressure taking end backflow cleaning:
s1221, valve control state: a negative pressure side return pipe control valve 12 is opened, a positive pressure side return pipe control valve 11 is closed, a pre-pump return pipe control valve 13 is opened, and a blow-down tank return pipe control valve 14 is closed;
s1222, duration T3, T3 is given through an HMI human-machine interface;
(II) a return pipe purging mode I comprises the following steps:
s131, valve control state: a steam back-flushing valve 17 of a positive pressure side return pipe is opened, a steam back-flushing valve 18 of a negative pressure side return pipe is opened, and a blow-down valve 19 is closed when steam is opened;
s132, setting duration T4, T4 through an HMI (human machine interface);
s133, a valve control state: closing a steam back-flushing valve 17 of a positive pressure side return pipe, closing a steam back-flushing valve 18 of a negative pressure side return pipe, and opening a drain valve 19 by steam to close;
(II) a backflow emptying mode which comprises a backflow cleaning maintenance mode II and a backflow pipe purging mode II, and the contents are as follows:
the second backflow cleaning maintenance mode comprises a second integral cleaning maintenance mode and a second independent cleaning maintenance mode, the second integral cleaning maintenance mode is that the backflow maintenance of the front pressure taking pipe 2 and the backflow maintenance of the rear pressure taking pipe 5 are carried out simultaneously, and the backflow flushing maintenance time is consistent; the second independent cleaning maintenance is that the backflow maintenance of the front pressure tapping pipe 2 and the backflow maintenance of the rear pressure tapping pipe 5 are respectively carried out, and the backflow flushing maintenance time is respectively set and the content is as follows:
1) And the integral cleaning and maintenance step II comprises the following steps:
s211, a valve control state: a negative pressure side return pipe control valve 12 is opened, a positive pressure side return pipe control valve 11 is opened, a pre-pump return pipe control valve 13 is closed, and an emptying tank return pipe control valve 14 is opened;
s212, setting duration T5, T5 through an HMI human-machine interface;
2) And the independent cleaning mode II comprises a front pressure taking end backflow cleaning II and a rear pressure taking end backflow cleaning II, and the contents are as follows:
s221, carrying out backflow cleaning on a front pressure taking end, and comprising the following steps:
s2211, valve control state: closing a negative pressure side return pipe control valve 12, opening a positive pressure side return pipe control valve 11, closing a pre-pump return pipe control valve 13, and opening an emptying tank return pipe control valve 14;
s2212, setting duration T6 and T6 through an HMI human-machine interface;
s222, back pressure taking end backflow cleaning is carried out, and the steps are as follows:
s2221, valve control state: a negative pressure side return pipe control valve 12 is opened, a positive pressure side return pipe control valve 11 is closed, a pre-pump return pipe control valve 13 is closed, and a blow-down tank return pipe control valve 14 is opened;
s2222, duration T7, T7 is given through an HMI human-machine interface;
and (II) refluxing, purging and maintaining, which comprises the following steps:
s231, valve control state: a steam back-flushing valve 17 of a positive pressure side return pipe is opened, a steam back-flushing valve 18 of a negative pressure side return pipe is opened, and a steam back-flushing blow-down valve 19 is opened;
s232, setting duration T8, T8 through an HMI human-machine interface;
s233, valve control state: and closing the steam back-blowing valve 17 of the positive pressure side return pipe, closing the steam back-blowing valve 18 of the negative pressure side return pipe, and closing the steam back-blowing blowoff valve 19.
(III) HMI human-machine interface parameter setting, the content is as follows:
in the above description:
t1, T5- -maintenance state maintenance time of the entire cleaning mode;
t2, T6-maintenance state maintaining time of the front pressure taking end of the independent cleaning mode;
t3, T7- -maintenance state maintaining time of the pressure taking end after the independent cleaning mode;
t4, T8- -Return pipe steam purging maintenance time.
[ example 2 ]
According to the scheme, a PLC/DCS system is used for realizing maintenance control of the wedge-shaped flowmeter, an HMI (human machine interface) is arranged on an operation station, the selection of the set value of the parameter and the maintenance mode is operated by an operator through the HMI, in the maintenance process of the wedge-shaped flowmeter, the flow measurement is kept in consideration of the deviation caused by the flow measurement in the maintenance process, and the flow measurement is recovered after the maintenance is finished, wherein the contents comprise the following steps:
timed start maintenance module 20
1) Selecting a maintenance starting mode, including timing starting or manual starting;
2) Setting a timing starting maintenance period T0, wherein the T0 is given by an HMI (human machine interface);
3) The operator selects the maintenance mode: a reflux blowdown mode and a reflux pre-pump mode.
(II) Return Pump Pre-maintenance Module 22
Two modes are adopted: integral cleaning maintenance and independent cleaning maintenance;
an integral cleaning mode:
1) The control state of the return pipe control valve is as follows: a negative pressure side return pipe control valve 12 is opened, a positive pressure side return pipe control valve 11 is opened, a pre-pump return pipe control valve 13 is opened, and a vent groove return pipe control valve 14 is closed;
2) Duration T1, T1 is given by HMI human-machine interface;
independent cleaning mode:
front pressure tapping end backflow cleaning
1) The control state of the return pipe control valve is as follows: closing the negative pressure side return pipe control valve 12, opening the positive pressure side return pipe control valve 11, opening the pre-pump return pipe control valve 13, and closing the emptying tank return pipe control valve 14;
2) Duration T2, T2 being given by the HMI human-machine interface;
back flow cleaning of back pressure taking end
1) The control state of the return pipe control valve is as follows: a negative pressure side return pipe control valve 12 is opened, a positive pressure side return pipe control valve 11 is closed, a pre-pump return pipe control valve 13 is opened, and a vent groove return pipe control valve 14 is closed;
2) The duration T3, T3 is given by the HMI human-machine interface.
(III) Return flow emptying maintenance Module 21
Two modes are adopted: integral cleaning maintenance and independent cleaning maintenance;
an integral cleaning mode:
1) The control state of the return pipe control valve is as follows: a negative pressure side return pipe control valve 12 is opened, a positive pressure side return pipe control valve 11 is opened, a pre-pump return pipe control valve 13 is closed, and a blow-down tank return pipe control valve 14 is opened;
2) Duration T1, T1 is given by HMI human machine interface;
independent cleaning mode:
and (3) backflow cleaning of a front pressure taking end:
1) The control state of the return pipe control valve is as follows: closing a negative pressure side return pipe control valve 12, opening a positive pressure side return pipe control valve 11, closing a pre-pump return pipe control valve 13, and opening a emptying tank return pipe control valve 14;
2) Duration T2, T2 being given by the HMI human-machine interface;
back pressure taking end reflux cleaning:
1) The control state of the return pipe control valve is as follows: a negative pressure side return pipe control valve 12 is opened, a positive pressure side return pipe control valve 11 is closed, a pre-pump return pipe control valve 13 is closed, and an emptying tank return pipe control valve 14 is opened;
2) The duration T3, T3 is given by the HMI human-machine interface.
(IV) automatic maintenance recovery Module 23
1) The control state of the return pipe control valve is as follows: closing the negative pressure side return pipe control valve 12, closing the positive pressure side return pipe control valve 11, closing the pre-pump return pipe control valve 13, and closing the emptying tank return pipe control valve 14;
2) The flow holding ends.
(V) Return line purge Module 24
1) The control state of the return pipe control valve is as follows: the steam back-blowing valve 17 of the positive pressure side return pipe is opened, the steam back-blowing valve 1818 of the negative pressure side return pipe is opened, and the steam back-blowing blowoff valve 19 is opened;
2) Duration T4, T4 being given by the HMI human-machine interface;
3) And (3) controlling the valve: closing a steam back-blowing valve 17 of a positive pressure side return pipe, closing a steam back-blowing valve 18 of a negative pressure side return pipe, and closing a steam back-blowing blowoff valve 19;
4) The maintenance procedure is ended.
The invention changes the traditional off-line maintenance method, and arranges a positive pressure end purging ring, a negative pressure end purging ring, a backflow pipeline and a backflow pipeline control valve on the basis of the traditional wedge-shaped flowmeter to realize on-line maintenance; a mode before a reflux pump and a reflux emptying mode are provided, and an operator selects according to the actual situation on site, so that the application range of online maintenance of the wedge-shaped flowmeter is widened; an operator can check the running state of the equipment at any time through the HMI human-computer interface; through the simple transformation to traditional wedge flowmeter, easy operation easily promotes.
Claims (10)
1. A wedge-shaped flowmeter maintenance system for coking comprises a wedge-shaped flowmeter, wherein the wedge-shaped flowmeter comprises a double-flange differential pressure transmitter, a front pressure taking pipe, a rear pressure taking pipe, a positive pressure end capillary pipe, a negative pressure end capillary pipe and a wedge-shaped flowmeter body, the front pressure taking pipe is used for being connected with the positive pressure end of the double-flange differential pressure transmitter through the positive pressure end capillary pipe, the rear pressure taking pipe is used for being connected with the negative pressure end of the double-flange differential pressure transmitter through the negative pressure end capillary pipe, and the positive pressure end and the negative pressure end of the double-flange differential pressure transmitter both adopt a diaphragm mode to take pressure; the wedge-shaped flowmeter body comprises a wedge block and a measuring pipe, the wedge block is arranged in the measuring pipe, and the measuring pipe is connected with the process pipeline through a flange;
the process pump is characterized by further comprising a positive-pressure end purging ring, a negative-pressure end purging ring, a backflow pipeline control valve and a process pump, wherein the process pipeline is sequentially provided with the process pump and a wedge-shaped flowmeter body, the positive-pressure end purging ring and the negative-pressure end purging ring are respectively arranged at the positions where the front pressure sampling pipe and the rear pressure sampling pipe are connected with the flange of the double-flange differential pressure transmitter, the backflow pipeline is provided with the backflow pipeline control valve, one end of the backflow pipeline is respectively connected with the positive-pressure end purging ring and the negative-pressure end purging ring, the other end of the backflow pipeline is connected with the process pipeline at the front end of the process pump, and the process pump and the backflow pipeline control valve are both connected with the PLC/DCS through ports.
2. The wedge-shaped flow meter maintenance system for coking according to claim 1, characterized in that the return pipeline comprises a positive pressure side return pipeline, a negative pressure side return pipeline, a first back-blowing steam pipeline, a second back-blowing steam pipeline and a first low pressure side return pipeline, one end of the positive pressure side return pipeline and one end of the negative pressure side return pipeline are respectively connected with the positive pressure end blowing ring and the negative pressure end blowing ring, and the other end of the positive pressure side return pipeline and the other end of the negative pressure side return pipeline are both connected with a process pipeline through the first low pressure side return pipeline;
the first blowback steam pipeline is connected with the negative pressure side return pipeline, the second blowback steam pipeline is connected with the positive pressure side return pipeline, and blowback steam is respectively introduced into the other end of the first blowback steam pipeline and the other end of the second blowback steam pipeline; the positive pressure end blowing ring and the negative pressure end blowing ring are provided with a plurality of blowing holes which are connected and converged on the return pipeline through pipelines.
3. The wedge-shaped flow meter maintenance system for coking according to claim 1, wherein the backflow pipe control valve comprises a positive pressure side backflow pipe control valve, a negative pressure side backflow pipe control valve, a pre-pump backflow pipe control valve, a positive pressure side backflow pipe steam blowback valve and a negative pressure side backflow pipe steam blowback valve, the positive pressure side backflow pipe control valve is arranged on the positive pressure side backflow pipe close to the positive pressure end purging ring, the negative pressure side backflow pipe control valve is arranged on the negative pressure side backflow pipe close to the negative pressure end purging ring, the pre-pump backflow pipe control valve is arranged on the low pressure side backflow pipe close to the process pipeline, the positive pressure side backflow pipe steam blowback valve is arranged on the back blowing steam pipeline two, and the negative pressure side backflow steam blowback valve is arranged on the back blowing steam pipeline one.
4. The wedge-shaped flow meter maintenance system for coking according to any one of claims 1 to 3, characterized by further comprising an emptying tank, a second low-pressure side return pipe and a steam blowdown pipeline, wherein the return pipe control valve further comprises an emptying tank return control valve and a steam blowback blowdown valve, the other end of the first low-pressure side return pipe is connected with the emptying tank through the second low-pressure side return pipe, the steam blowdown pipeline is connected with the second low-pressure side return pipe, and the other end of the steam blowdown pipeline is used for steam blowdown; and the second low-pressure side return pipeline is provided with an emptying groove return control valve, and the steam blow-off pipeline is provided with a steam blow-off valve.
5. A wedge-shaped flowmeter maintenance system for coking comprises a wedge-shaped flowmeter, wherein the wedge-shaped flowmeter comprises a double-flange differential pressure transmitter, a front pressure taking pipe, a rear pressure taking pipe, a positive pressure end capillary pipe, a negative pressure end capillary pipe and a wedge-shaped flowmeter body, the front pressure taking pipe is used for being connected with the positive pressure end of the double-flange differential pressure transmitter through the positive pressure end capillary pipe, the rear pressure taking pipe is used for being connected with the negative pressure end of the double-flange differential pressure transmitter through the negative pressure end capillary pipe, and the positive pressure end and the negative pressure end of the double-flange differential pressure transmitter both adopt a diaphragm mode to take pressure; the wedge-shaped flowmeter body comprises a wedge block and a measuring pipe, the wedge block is arranged in the measuring pipe, and the measuring pipe is connected with the process pipeline through a flange;
the process pipeline is provided with a wedge-shaped flowmeter body, the joint of a front pressure tapping pipe, a rear pressure tapping pipe and a flange of the double-flange differential pressure transmitter is respectively provided with the positive pressure end purging ring and the negative pressure end purging ring, the return pipeline is provided with a return pipe control valve, one end of the return pipeline is respectively connected with the positive pressure end purging ring and the negative pressure end purging ring, the other end of the return pipeline is connected with the emptying groove, and the return pipe control valve is connected with the PLC/DCS system through a port.
6. The wedge-shaped flow meter maintenance system for coking according to claim 5, characterized in that the return line comprises a positive pressure side return line, a negative pressure side return line, a first blowback steam line, a second low pressure side return line and a steam blowdown line, one end of the positive pressure side return line and one end of the negative pressure side return line are respectively connected with the positive pressure end blowing ring and the negative pressure end blowing ring, the other end of the positive pressure side return line and the other end of the negative pressure side return line are both connected with the second low pressure side return line, and the other end of the second low pressure side return line is connected with the blow-down tank;
the first back-blowing steam pipeline is connected with the negative pressure side return pipeline, the second back-blowing steam pipeline is connected with the positive pressure side return pipeline, the steam blow-down pipeline is connected with the second low pressure side return pipeline, back-blowing steam is respectively fed into the other end of the first back-blowing steam pipeline and the other end of the second back-blowing steam pipeline, and the other end of the steam blow-down pipeline is used for steam blow-down; the positive pressure end sweeping ring and the negative pressure end sweeping ring are provided with a plurality of sweeping holes which are connected and converged to the return pipeline through pipelines.
7. The wedge-shaped flow meter maintenance system for coking according to claim 5, characterized in that the backflow control valve comprises a positive pressure side backflow control valve, a negative pressure side backflow control valve, a blow-down groove backflow control valve, a positive pressure side backflow steam blowback valve, a negative pressure side backflow steam blowback valve, and a steam blowback blowoff valve, wherein the positive pressure side backflow pipeline is provided with the positive pressure side backflow control valve near the positive pressure end blow-down ring, the negative pressure side backflow pipeline is provided with the negative pressure side backflow control valve near the negative pressure end blow-down ring, the low pressure side backflow pipeline is provided with the blow-down groove backflow control valve, the blowback steam pipeline is provided with the positive pressure side backflow steam blowback valve, the blowback steam pipeline is provided with the negative pressure side backflow steam blowback valve, and the steam blowoff pipe is provided with the steam blowback blowoff valve.
8. The system according to any one of claims 1 to 3 is used for a maintenance method of the wedge-shaped flowmeter for coking, and is characterized in that the wedge-shaped flowmeter is maintained on line through a return pipe, a return pipe control valve and a process pump, and the return pipe is purged by steam at fixed time; the PLC/DCS system controls a backflow pump front mode, including a backflow cleaning maintenance mode I and a backflow pipe purging mode I, and the contents are as follows:
the first backflow cleaning maintenance mode comprises a first integral cleaning maintenance mode and a first independent cleaning maintenance mode, wherein the first integral cleaning maintenance mode is that the backflow maintenance of the front pressure taking pipe and the backflow maintenance of the rear pressure taking pipe are carried out simultaneously, and the backflow flushing maintenance time is consistent; the independent cleaning and maintenance is that the backflow maintenance of the front pressure tapping pipe and the backflow maintenance of the rear pressure tapping pipe are respectively carried out, the backflow flushing maintenance time is respectively set, and the content is as follows:
1) The integral cleaning and maintenance method comprises the following steps:
s111, a backflow pipe control state: opening a control valve of a negative pressure side return pipe, opening a control valve of a positive pressure side return pipe, opening a control valve of a pre-pump return pipe, and closing a return control valve of an emptying tank;
s112, giving duration T1, T1 through an HMI (human machine interface);
2) The independent cleaning and maintaining step I comprises a front pressure taking end backflow cleaning step I and a rear pressure taking end backflow cleaning step I, and comprises the following steps:
s121, performing backflow cleaning on a front pressure taking end:
s1211 and controlling the valve state: closing a negative pressure side return pipe control valve, opening a positive pressure side return pipe control valve, opening a pre-pump return pipe control valve, and closing an emptying tank return pipe control valve;
s1212, setting duration time T2, T2 through an HMI (human machine interface);
s122, back pressure taking end backflow cleaning:
s1221, valve control state: opening a negative pressure side return pipe control valve, closing a positive pressure side return pipe control valve, opening a pre-pump return pipe control valve, and closing an emptying tank return pipe control valve;
s1222, duration T3, T3 is given through an HMI human-machine interface;
(II) a return pipe purging mode I comprises the following steps:
s131, valve control state: opening a steam back-blowing valve of a positive pressure side return pipe, and opening a steam back-blowing valve of a negative pressure side return pipe;
s132, setting duration T4, T4 through an HMI (human machine interface);
s133, valve control state: and closing the steam back-blowing valve of the positive pressure side return pipe, and closing the steam back-blowing valve of the negative pressure side return pipe.
9. The system according to any one of claims 5 to 7 is used for a maintenance method of a wedge-shaped flowmeter for coking, and is characterized in that online maintenance of the wedge-shaped flowmeter is realized by adding a return pipe, a return pipe control valve and an emptying tank, and timing steam purging is performed on the return pipe, the maintenance method is a return emptying mode, the emptying tank is used for recovering leakage of process media in the production process, and the pressure in the emptying tank is zero, so that dirty media in the wedge-shaped flowmeter flow and flow back to a low pressure place; the PLC/DCS system controls a backflow emptying mode, the backflow emptying mode comprises a backflow cleaning maintenance mode II and a backflow pipe purging mode II, and the contents are as follows:
the second backflow cleaning maintenance mode comprises a second integral cleaning maintenance mode and a second independent cleaning maintenance mode, wherein the second integral cleaning maintenance mode is that the backflow maintenance of the front pressure sampling pipe and the backflow maintenance of the rear pressure sampling pipe are carried out simultaneously, and the backflow flushing maintenance time is consistent; independent cleaning maintenance two is that the backward flow of preceding pressure pipe and back pressure pipe is safeguarded and is carried out respectively, and the time of backward flow washing maintenance sets up respectively, and the content is as follows:
1) And the integral cleaning and maintenance step II comprises the following steps:
s211, valve control state: opening a control valve of a negative pressure side return pipe, opening a control valve of a positive pressure side return pipe, closing a control valve of a pre-pump return pipe, and opening a return control valve of an emptying groove;
s212, setting the duration T5, wherein T5 is given through an HMI (human machine interface);
2) And the independent cleaning and maintenance step two comprises a front pressure taking end backflow cleaning step two and a rear pressure taking end backflow cleaning step two, and the contents are as follows:
s221, carrying out backflow cleaning on a front pressure taking end, and comprising the following steps:
s2211, valve control state: closing a negative pressure side return pipe control valve, opening a positive pressure side return pipe control valve, closing a pre-pump return pipe control valve, and opening an emptying tank return pipe control valve;
s2212, setting duration T6 and T6 through an HMI human-machine interface;
s222, back pressure taking end backflow cleaning is performed, and the steps are as follows:
s2221, a valve control state: opening a control valve of a negative pressure side return pipe, closing a control valve of a positive pressure side return pipe, closing a control valve of a pre-pump return pipe, and opening a return control valve of an emptying groove;
s2222, duration T7, T7 is given through an HMI human-machine interface;
and (II) refluxing, purging and maintaining, which comprises the following steps:
s231, valve control state: opening a steam back-blowing valve of a positive-pressure side return pipe, opening a steam back-blowing valve of a negative-pressure side return pipe, and opening a steam back-blowing blowoff valve;
s232, setting duration T8, T8 through an HMI human-machine interface;
s233, valve control state: and closing the steam back-blowing valve of the positive-pressure side return pipe, closing the steam back-blowing valve of the negative-pressure side return pipe, and closing the steam back-blowing blowoff valve.
10. The system of any one of claim 4, wherein the maintenance method comprises a reflux pump pre-mode and a reflux venting mode, the reflux pump pre-mode is that the process medium in the process pipeline is pressurized and sent out by the process pump, and the pressure at the front end of the process pump is lower than that at the front end of the wedge-shaped flowmeter, so that the dirty medium in the wedge-shaped flowmeter flows up and flows back to the low pressure; the backflow emptying mode is that an emptying groove is used for recovering leakage and leakage of process media in the production process, the pressure in the emptying groove is zero, so that the dirty media in the wedge-shaped flowmeter flow and flow back to the low pressure position;
the operating personnel realizes the selection of the mode before the reflux pump and the backflow emptying mode through the switch action of the reflux control valve of the reflux pipe before the selective pump and the emptying tank, and the remote control is completed by the PLC/DCS system, and the content comprises the following steps:
the method comprises the following steps that (I) a backflow pump front mode comprises a backflow cleaning maintenance mode I and a backflow pipe purging mode I, and the contents are as follows:
the first backflow cleaning maintenance mode comprises a first integral cleaning maintenance mode and a first independent cleaning maintenance mode, wherein the first integral cleaning maintenance mode is that the backflow maintenance of the front pressure taking pipe and the backflow maintenance of the rear pressure taking pipe are carried out simultaneously, and the backflow flushing maintenance time is consistent; the independent cleaning and maintenance is that the backflow maintenance of the front pressure tapping pipe and the backflow maintenance of the rear pressure tapping pipe are respectively carried out, the backflow flushing maintenance time is respectively set, and the content is as follows:
1) The integral cleaning and maintenance method comprises the following steps:
s111, a return pipe control state: opening a negative pressure side return pipe control valve, opening a positive pressure side return pipe control valve, opening a pre-pump return pipe control valve, and closing an emptying tank return pipe control valve;
s112, setting the duration T1, wherein the T1 is given through an HMI (human machine interface);
2) The independent cleaning and maintaining step I comprises a front pressure taking end backflow cleaning step I and a rear pressure taking end backflow cleaning step I, and comprises the following steps:
s121, carrying out backflow cleaning on a front pressure taking end:
s1211, controlling the state of the valve: closing a negative pressure side return pipe control valve, opening a positive pressure side return pipe control valve, opening a pre-pump return pipe control valve, and closing an emptying tank return pipe control valve;
s1212, setting duration time T2, T2 through an HMI (human machine interface);
s122, back pressure taking end backflow cleaning:
s1221, a valve control state: opening a control valve of a negative pressure side return pipe, closing a control valve of a positive pressure side return pipe, opening a control valve of a pre-pump return pipe, and closing a return control valve of an emptying tank;
s1222, duration T3, T3 is given through an HMI human-machine interface;
(II) a return pipe purging mode I comprises the following steps:
s131, valve control state: the steam back-flushing valve of the positive pressure side return pipe is opened, the steam back-flushing valve of the negative pressure side return pipe is opened, and the steam opening blow-down valve 19 is closed;
s132, setting duration T4, wherein T4 is given through an HMI (human machine interface);
s133, a valve control state: closing a steam back-flushing valve of a positive-pressure side return pipe, closing a steam back-flushing valve of a negative-pressure side return pipe, and opening a drain valve by steam to close;
(II) a backflow emptying mode which comprises a backflow cleaning maintenance mode II and a backflow pipe purging mode II, and the contents are as follows:
the second backflow cleaning maintenance mode comprises a second integral cleaning maintenance mode and a second independent cleaning maintenance mode, wherein the second integral cleaning maintenance mode is that the backflow maintenance of the front pressure sampling pipe and the backflow maintenance of the rear pressure sampling pipe are carried out simultaneously, and the backflow flushing maintenance time is consistent; independent cleaning maintenance two is that the backward flow of preceding pressure pipe and back pressure pipe is safeguarded and is carried out respectively, and the time of backward flow washing maintenance sets up respectively, and the content is as follows:
1) And the integral cleaning and maintenance step II comprises the following steps:
s211, a valve control state: opening a control valve of a negative pressure side return pipe, opening a control valve of a positive pressure side return pipe, closing a control valve of a pre-pump return pipe, and opening a return valve of an emptying tank;
s212, setting the duration T5, wherein T5 is given through an HMI (human machine interface);
2) And the independent cleaning mode II comprises a front pressure taking end backflow cleaning II and a rear pressure taking end backflow cleaning II, and the contents are as follows:
s221, carrying out backflow cleaning on a front pressure taking end, and comprising the following steps:
s2211, valve control state: closing a negative pressure side return pipe control valve, opening a positive pressure side return pipe control valve, closing a pre-pump return pipe control valve, and opening an emptying tank return pipe control valve;
s2212, setting duration T6 and T6 through an HMI human-machine interface;
s222, back pressure taking end backflow cleaning is performed, and the steps are as follows:
s2221, a valve control state: opening a control valve of a negative pressure side return pipe, closing a control valve of a positive pressure side return pipe, closing a control valve of a pre-pump return pipe, and opening a return control valve of an emptying groove;
s2222, duration T7, T7 is given through an HMI human-machine interface;
and (II) refluxing, purging and maintaining, wherein the steps are as follows:
s231, valve control state: opening a steam back-blowing valve of a positive pressure side return pipe, opening a steam back-blowing valve of a negative pressure side return pipe, and opening a steam back-blowing blowoff valve;
s232, setting duration T8, T8 through an HMI human-machine interface;
s233, valve control state: and closing the steam back-blowing valve of the positive-pressure side return pipe, closing the steam back-blowing valve of the negative-pressure side return pipe, and closing the steam back-blowing blowoff valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211646027.9A CN115773798A (en) | 2022-12-21 | 2022-12-21 | Wedge-shaped flow meter maintenance system and method for coking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211646027.9A CN115773798A (en) | 2022-12-21 | 2022-12-21 | Wedge-shaped flow meter maintenance system and method for coking |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115773798A true CN115773798A (en) | 2023-03-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211646027.9A Pending CN115773798A (en) | 2022-12-21 | 2022-12-21 | Wedge-shaped flow meter maintenance system and method for coking |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115773798A (en) |
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2022
- 2022-12-21 CN CN202211646027.9A patent/CN115773798A/en active Pending
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