CN103191678B - For protection interlock system and the method for paste state bed reactor filter - Google Patents
For protection interlock system and the method for paste state bed reactor filter Download PDFInfo
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- CN103191678B CN103191678B CN201210484634.XA CN201210484634A CN103191678B CN 103191678 B CN103191678 B CN 103191678B CN 201210484634 A CN201210484634 A CN 201210484634A CN 103191678 B CN103191678 B CN 103191678B
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Abstract
The invention discloses a kind of protection interlock system for paste state bed reactor filter and method, protection interlock system comprises: filter; Filter stop valve, blowback air stop valve, differential pressure levelmeter, dcs, can be connected communicatedly with filtration stop valve, blowback air stop valve and differential pressure levelmeter, receive the signal that differential pressure levelmeter sends, this signal and the threshold value prestored are compared, when the liquid level that the liquid level in comparative result display paste state bed reactor represents lower than described threshold value, send shutdown signal to both described filtration stop valve and blowback air stop valve simultaneously.Also proposed the method for this system.This method and system solve the technical problem that filter is scrapped because of carbon distribution or sintering under abnormal condition.
Description
Technical field
The present invention relates to the filter for paste state bed reactor, particularly relate to a kind of protection interlock system for described filter and method.
Background technology
Object for the filter (being also referred to as screen pipe) of paste state bed reactor is the atoleine filtering out inside reactor, and the foreign material such as catalyst, iron ion are retained in inside reactor.Described screen pipe Chang Yinwei media accumulation and blocking.The main medium causing screen pipe to block is the catalyst of carbon granule and fragmentation, and the life-span length of screen pipe directly affects the production load of F-T synthesis.Screen pipe under normal circumstances service cycle longer, and the time of start-stop screen pipe is comparatively delayed.If circulator interrupts all causing reactor liquid level to decline rapidly because of disastershutdown or unstripped gas, now screen pipe by exposed outside slurries, while screen pipe be still in filtration, blowback state.Just have a large amount of process gas in this condition by screen pipe reacts on the catalyst of its remained on surface, and because fischer-tropsch reaction is strong exothermal reaction, reaction liberated heat cannot be removed in time and will cause catalyst breakage or coking.The lighter's screen pipe Intranet hole plug affects wax amount, and the fragmentation of severe one screen pack cannot utilize and cause stopping.The screen pack of screen pipe is integral sintered making, and its order number can reach micron order.The impact being subject to extraneous factor is easy to, such as temperature, filtration pressure difference and the slurry environment residing for screen pipe in daily operation.And the voltage withstand class of screen pipe and the life-span extremely limited.Ensureing that screen pipe as why not affects by extraneous factor is the core of paste state bed reactor.Screen pipe only has pressure reduction height interlocking to there is no the low interlocking of liquid level at present, carry out the adjustment of reactor liquid level by the filtration group number of modified chimney filter and filtration time under normal circumstances, be easy to cause screen pipe upper portion exposed outside slurries because this regulating cycle is long; There is very large uncertainty in chemical industry operation, stop or the emergency such as unstripped gas interruption once meet circulator accident, middle control people system regulates and is difficult to take into account the related valve of closing screen pipe, even if close valve also must need certain hour.Partial filtration pipe will be sintered or block in the process.Screen pipe blocking or sintering are fatal, once be difficult to after occurring recover, its possibility recovered is almost nil.And the production cycle of screen pipe is long, can not change online, need parking completely, the material returned, displacement, isolating this cycle needs more than one week the soonest, has a strong impact on production run efficiency.
Summary of the invention
For this reason, the present invention devises a kind of interlock system for paste state bed reactor filter and method, prevents filter from scrapping because of carbon distribution or sintering under abnormal condition, affects production efficiency.
According to an aspect of the present invention, described interlock system comprises: filter, is arranged at described paste state bed reactor inner; Filter stop valve, be communicated with described filter, the opening and closing of the filtering function of controlled filter device; Blowback air stop valve, is communicated with described filter, controls the opening and closing of the blowback air function of filter being carried out to blowback air; Differential pressure levelmeter, for measuring the liquid level in paste state bed reactor, and is sent to dcs by the signal of reflection liquid level; Dcs, can be connected communicatedly with described filtration stop valve, blowback air stop valve and differential pressure levelmeter, receive the signal that differential pressure levelmeter sends, this signal and the threshold value prestored are compared, when the liquid level that the liquid level in comparative result display paste state bed reactor represents lower than described threshold value, send shutdown signal to both described filtration stop valve and blowback air stop valve simultaneously.
According to a further aspect in the invention, described filter is one or more screen pipe, and when for a screen pipe, this system has a filtration stop valve and a blowback air stop valve is corresponding with this screen pipe; When for multiple screen pipe, screen pipe two is one group, many groups is a set of, this system has a filtration stop valve corresponding with often organizing screen pipe and a blowback air stop valve, and there is corresponding with often overlapping screen pipe one filter and cut off main valve and a blowback air cuts off main valve, one of them screen pipe and filtration stop valve, one filter and cut off main valve and be linked in sequence, and cut off main valve be linked in sequence with a blowback air stop valve, a blowback air.
According to a further aspect in the invention, described filtration stop valve and blowback air stop valve are pneumatic cut-off valve, after receiving shutdown signal, perform shutoff operation simultaneously.
According to a further aspect in the invention, described dcs is by middle-size and small-size industrial control computer or high performance microprocessor, and distributed microprocessor composition, described filtration stop valve, blowback air stop valve and differential pressure levelmeter is connected to by wired or wireless connection, described dcs comprises storage device, stores described threshold value in described storage device.
According to a further aspect in the invention, the quantity of differential pressure levelmeter is multiple, dcs is for receiving multiple signals of reflection liquid level, when the liquid level that the liquid level that the one or more signals in described multiple signal reflect represents lower than described threshold value, dcs sends shutdown signal to both described filtration stop valve and blowback air stop valve simultaneously.
According to a further aspect in the invention, differential pressure levelmeter is used for, when the moment sensing liquid level significantly changes or with predetermined time interval, the analog signal of reaction liquid level is sent to dcs.
According to a further aspect in the invention, described paste state bed reactor for obtain filter stop valve, blowback air stop valve in front and current state, and these states are stored in described storage device; And, when the liquid level that described comparative result display current level represents higher than predetermined threshold, if current paste state bed reactor is in normal filter process, namely blowback air stop valve is in closed condition, filter stop valve and be in open mode, or blowback air process, namely filter stop valve and be in closed condition, blowback air stop valve is in open mode, then dcs is used for not sending a signal to blowback air stop valve and filtering stop valve to keep the current state of blowback air stop valve and filtration stop valve; If filtration stop valve and blowback air stop valve are all in closed condition, then dcs be used for according to the filtration stop valve stored in storage device and blowback air stop valve in front state, send corresponding signal to blowback air stop valve with filter stop valve to control blowback air stop valve and filtration stop valve returns to the state be both in before closed condition.
The invention also discloses the protection interlocking method for paste state bed reactor filter, the method is applied in above-mentioned arbitrary system, comprising: after differential pressure levelmeter obtains the liquid level of paste state bed reactor, sends the signal of reflection liquid level to dcs; After dcs receives the signal of described reflection liquid level, this signal and the threshold value prestored are compared, when the liquid level that the liquid level in comparative result display paste state bed reactor represents lower than described threshold value, send shutdown signal to filtering both stop valve and blowback air stop valve simultaneously; After filtration stop valve and blowback air stop valve receive shutdown signal, both close simultaneously.
According to a further aspect in the invention, the method also comprises: when the liquid level that the liquid level in described comparative result display paste state bed reactor represents higher than described threshold value, if current paste state bed reactor is in normal filter process, namely blowback air stop valve is in closed condition, filter stop valve and be in open mode, or blowback air process, namely filter stop valve and be in closed condition, blowback air stop valve is in open mode, then do not send a signal to blowback air stop valve and filter stop valve; And when the liquid level that the liquid level in described comparative result display paste state bed reactor represents higher than described threshold value, if filtration stop valve and blowback air stop valve are all in closed condition, then according to filter stop valve and blowback air stop valve in front state, send corresponding connect or shutdown signal to blowback air stop valve with filter stop valve to control blowback air stop valve and filtration stop valve returns to the state be both in before closed condition; Described blowback air stop valve and filtration stop valve receive described connection or shutdown signal, perform corresponding connection or shutoff operation.
As can be seen here, the present invention proposes a set of guarantee screen pipe and be immersed in paraffin all the time, the generation even if surface responds, heat also can be removed in time with the interlock system of anti-carbon deposition sintering phenomenon generation and method.Use system and method for the present invention, screen pack can be protected not to be completely clogged with soot or strong heat release sintering, it is applicable to the filter system of all strong exothermal reactions.Compared with prior art, this programme increases the low interlocking of reactor liquid level, as long as when no matter under any circumstance reactor liquid level is lower than certain value, the blowback air of screen pipe, filter stop valve action of interlocking immediately and close, all the time ensure that screen pipe is immersed among slurries, prevent process gas from damaging screen pipe by screen pack, for device steadily, stable operation escorts, simultaneously can the extension device life-span, investment reduction cost; After interlocking triggers, stop valve cuts out automatically, avoids the harmful effect that manually carelessness or maloperation bring.
Accompanying drawing explanation
Fig. 1 is the dependency structure schematic diagram of paste state bed reactor according to an embodiment of the invention;
Fig. 2 protects interlock system structure chart according to an embodiment of the invention;
Fig. 3 is decision flow chart according to an embodiment of the invention.
Detailed description of the invention
Fig. 1 shows the dependency structure schematic diagram of paste state bed reactor according to an embodiment of the invention.Because the present invention is intended to protect the filter of paste state bed reactor, therefore introduce the device relevant to filter (being screen pipe shown in Fig. 1) and circuit here.As shown in Figure 1, the screen pipe (such as heavy wax screen pipe) of paste state bed reactor is arranged on inside reactor, whole separating and filtering system is a sequence control system, and described separating and filtering system comprises: the links such as filtration, immersion, blow-back, liquid blowback.
According to one embodiment of present invention, built-in 30 screen pipes of paste state bed reactor, merge into one group every 2 of reactor outlet, and 15 groups of screen pipes after merging are divided into three covers (A, B, C overlap) again, and five groups is a set of.The isolated heavy wax of screen pipe, enter respectively in heavy wax knockout drum (D-6201A, B, C, not shown) by filtering stop valve (for heavy wax stop valve XCV6102A ~ O and heavy wax cut off main valve XCV6201A/B/C in this example).In this example, each of heavy wax stop valve XCV6102 (A ~ O) is communicated with the often group of 15 groups of screen pipes respectively, and heavy wax cuts off each the connection with the three often covers overlapping screen pipe of main valve XCV6201A/B/C.Such as first group of screen pipe cuts off main valve XCV6201A with heavy wax stop valve XCV6102A and heavy wax and is communicated with, and the 15 group of screen pipe can cut off main valve XCV6201C with heavy wax stop valve XCV6102O and heavy wax and be communicated with.In addition, blowback air stop valve (for blowback air cuts off main valve XCV-6104A/B/C and blowback air stop valve XCV-6103A ~ 0 in this example) is communicated with screen pipe, carries out blowback air to screen pipe.The mode of communicating of blowback air stop valve and screen pipe is similar with the mode of communicating filtering stop valve and screen pipe, repeats no more here.Quantity and the combination of the quantity of the screen pipe in this example, combination (group, cover) and each stop valve corresponding are only example, not as limitation of the present invention.
For first screen pipe, its filter process is: blowback air stop valve XCV-6103A closes, and filters stop valve XCV-6102A, XCV-6201A and opens, and inside reactor liquid wax starts the process of extracting out; Its immersion process is: blowback air stop valve XCV-6103A and filtration stop valve XCV-6102A closes simultaneously, and screen pipe is fully immersed in the process in slurries; Its blowback air process is: filter stop valve XCV-6102A and close, blowback air stop valve XCV-6103A and blowback air main valve XCV-6104A opens, and blowback air blows to the process of inside reactor by screen pipe.
The differential pressure levelmeter for measuring liquid level in paste state bed reactor is also show in Fig. 1.Described differential pressure levelmeter can send analog signal in real time to dcs (will be described hereinafter), to reflect the inside liquid level of paste state bed reactor.In addition, Fig. 1 also show other circuits relevant to paste state bed reactor or device (exhaust gas, catalyst binder line, the catalyst line of return, the anti-blocking line of distributor, enter tower stop valve etc.), these and object of the present invention are not closely related, and are not thus further explained.
Fig. 2 shows the structural representation protecting interlock system according to an embodiment of the invention.
As shown in Figure 2; the described protection interlock system inside comprised as shown in Figure 1 is provided with the paste state bed reactor of screen pipe; and filter stop valve and blowback air stop valve (illustrating with relative black triangles respectively), also comprise the one or more differential pressure levelmeters for measuring liquid level in paste state bed reactor.In addition, described protection interlock system also comprises dcs, and described dcs is made up of middle-size and small-size industrial control computer or high performance microprocessor and distributed microprocessor.Dcs can be connected to differential pressure levelmeter communicatedly by wired or wireless connection, be filtered stop valve and blowback air stop valve.
As described above, one or more differential pressure levelmeter measures the liquid level in paste state bed reactor, and the live signal of reflection liquid level is sent to dcs, described transmission can be the differential pressure levelmeter initiatively timed sending maybe transmission when recording pressure and occurring to change rapidly, also can be the active poll of dcs.Dcs receives the signal that one or more differential pressure levelmeter sends, and signal and predetermined threshold value is compared, according to comparative result, and the connection of controlled filter stop valve and blowback air stop valve or closedown.
In one embodiment of the invention, when compressor connection stops or unstripped gas interrupts, the gas holdup of inside reactor reduces instantaneously, causes reactor liquid level to decline rapidly.The moment sensing this liquid level when one or more differential pressure levelmeter significantly changes or with predetermined time interval, sends the analog signal of reflection liquid level to dcs.Dcs receives described analog signal, this signal and setting value are compared, if comparative result is lower than interlocking setting value, shutdown signal will be sent to filtering stop valve and blowback air stop valve (pneumatic cut-off valve can be implemented as here), stop filtration, blowback air operation, ensure that screen pipe is fully immersed in slurries.
Fig. 3 shows corresponding decision flow chart.
Employ three differential pressure levelmeters in example as shown in Figure 3, use the object of multiple differential pressure levelmeter to be prevent one of them liquid level gauge from breaking down, measure inaccurate and subsequent operation error that is that cause.When after the signal receiving three differential pressure levelmeters transmissions, compare with interlocking setting value, when two or more comparative results are all lower than setting value, dcs sends shutdown signal to blowback air stop valve and filtration stop valve, close described blowback air stop valve and filter stop valve, thus stop filtration, blowback air operation, enter immersion process.When the liquid level that comparative result display liquid level represents higher than predetermined threshold, if current paste state bed reactor is in normal filter process, (blowback air stop valve is in closed condition, filter stop valve and be in open mode) or (the filtration stop valve closedown of blowback air process, blowback air stop valve is opened), then keep the current state of blowback air stop valve and filtration stop valve; If be in immersion process (to filter stop valve to close, blowback air stop valve cuts out), then control blowback air stop valve and filter stop valve make it recover immersion process before original state of paste state bed reactor or the on/off state that controls blowback air stop valve according to other demands (such as artificial) and filter stop valve.For this reason, dcs have storage device with store each stop valve in front and current state, such as, when sending the order relevant with blowback air, immersion, filter process to each stop valve, dcs can record these order and each stop valve perform these order after corresponding state.Thus obtain these in front and current state.
It should be noted that detailed description of the invention proposed by the invention and application are only the object of explanation, not as limiting the scope of the invention, those skilled in the art can modify to the specific embodiment of the present invention, to meet actual needs.Such as, can indirectly judge that screen pipe is exposed outside slurries etc. by introducing other signal instead of liquid level signal.
Claims (7)
1. for the protection interlock system of paste state bed reactor filter, it is characterized in that, this system comprises:
Filter, is arranged at described paste state bed reactor inner;
Described filter is multiple screen pipe, described multiple screen pipe two is one group, many groups is a set of, this system has a filtration stop valve corresponding with often organizing screen pipe and a blowback air stop valve, and there is corresponding with often overlapping screen pipe one filter and cut off main valve and a blowback air cuts off main valve, one of them screen pipe and filtration stop valve, one filter and cut off main valve and be linked in sequence, and cut off main valve be linked in sequence with a blowback air stop valve, a blowback air;
Filter stop valve, be communicated with described filter, the opening and closing of the filtering function of controlled filter device;
Blowback air stop valve, is communicated with described filter, controls the opening and closing of the blowback air function of filter being carried out to blowback air;
Differential pressure levelmeter, for measuring the liquid level in paste state bed reactor, and is sent to dcs by the signal of reflection liquid level;
Dcs, can be connected communicatedly with described filtration stop valve, blowback air stop valve and differential pressure levelmeter, receive the signal that differential pressure levelmeter sends, this signal and the threshold value prestored are compared, when the described screen pipe that the liquid level in comparative result display paste state bed reactor represents lower than described threshold value is by exposed liquid level outside slurries, send shutdown signal to both described filtration stop valve and blowback air stop valve simultaneously, be fully immersed in slurries to make filter; Wherein
The quantity of differential pressure levelmeter is multiple, dcs is for receiving multiple signals of reflection liquid level, when the liquid level that the liquid level that the one or more signals in described multiple signal reflect represents lower than described threshold value, dcs sends shutdown signal to both described filtration stop valve and blowback air stop valve simultaneously.
2. system according to claim 1, is characterized in that:
Described filtration stop valve and blowback air stop valve are pneumatic cut-off valve, after receiving shutdown signal, perform shutoff operation simultaneously.
3. system according to claim 1, is characterized in that:
Described dcs is by middle-size and small-size industrial control computer or high performance microprocessor, and distributed microprocessor composition, described filtration stop valve, blowback air stop valve and differential pressure levelmeter is connected to by wired or wireless connection, described dcs comprises storage device, stores described threshold value in described storage device.
4. system according to claim 1, is characterized in that:
Differential pressure levelmeter is used for, when the moment sensing liquid level significantly changes or with predetermined time interval, the analog signal of reaction liquid level is sent to dcs.
5. system according to claim 4, is characterized in that:
Described paste state bed reactor for obtain filter stop valve, blowback air stop valve in front and current state, and by these states store in the storage device; And, when the liquid level that described comparative result display current level represents higher than predetermined threshold, if current paste state bed reactor is in normal filter process, namely blowback air stop valve is in closed condition, filter stop valve and be in open mode, or blowback air process, namely filter stop valve and be in closed condition, blowback air stop valve is in open mode, then dcs is used for not sending a signal to blowback air stop valve and filtering stop valve to keep the current state of blowback air stop valve and filtration stop valve; If filtration stop valve and blowback air stop valve are all in closed condition, then dcs be used for according to the filtration stop valve stored in storage device and blowback air stop valve in front state, send corresponding signal to blowback air stop valve with filter stop valve to control blowback air stop valve and filtration stop valve returns to the state be both in before closed condition.
6., for the protection interlocking method of paste state bed reactor filter, the method is applied in the arbitrary system as described in claim 1-5, comprising:
After differential pressure levelmeter obtains the liquid level of paste state bed reactor, send the signal of reflection liquid level to dcs;
After dcs receives the signal of described reflection liquid level, this signal and the threshold value prestored are compared, when the described screen pipe that the liquid level in comparative result display paste state bed reactor represents lower than described threshold value is by exposed liquid level outside slurries, send shutdown signal to filtering both stop valve and blowback air stop valve simultaneously;
After filtration stop valve and blowback air stop valve receive shutdown signal, both close simultaneously, are fully immersed in slurries to make filter; Wherein
The quantity of differential pressure levelmeter is multiple, dcs receives multiple signals of reflection liquid level, when the described liquid level that the liquid level that the one or more signals in described multiple signal reflect represents lower than described threshold value, send shutdown signal to both described filtration stop valve and blowback air stop valve simultaneously.
7. method according to claim 6, is characterized in that:
When the liquid level that the liquid level in described comparative result display paste state bed reactor represents higher than described threshold value, if current paste state bed reactor is in normal filter process, namely blowback air stop valve is in closed condition, filter stop valve and be in open mode, or blowback air process, namely filter stop valve and be in closed condition, blowback air stop valve is in open mode, then do not send a signal to blowback air stop valve and filter stop valve; And
When the liquid level that the liquid level in described comparative result display paste state bed reactor represents higher than described threshold value, if filtration stop valve and blowback air stop valve are all in closed condition, then according to filter stop valve and blowback air stop valve in front state, send corresponding connect or shutdown signal to blowback air stop valve with filter stop valve to control blowback air stop valve and filtration stop valve returns to the state be both in before closed condition;
Described blowback air stop valve and filtration stop valve receive described connection or shutdown signal, perform corresponding connection or shutoff operation.
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| CN201210484634.XA CN103191678B (en) | 2012-11-16 | 2012-11-16 | For protection interlock system and the method for paste state bed reactor filter |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104549069A (en) * | 2014-12-11 | 2015-04-29 | 内蒙古伊泰煤制油有限责任公司 | Filter system for slurry bed reactor |
| CN108067165B (en) * | 2016-11-10 | 2019-12-10 | 国家能源投资集团有限责任公司 | Gas-liquid-solid multiphase flow reactor and control system and method thereof |
| CN108459636A (en) * | 2017-02-22 | 2018-08-28 | 中昊晨光化工研究院有限公司 | Overhead steam boiler safety interlocking start stop control method and control system |
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