CN216005264U - MVR evaporation crystallization system - Google Patents
MVR evaporation crystallization system Download PDFInfo
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- CN216005264U CN216005264U CN202122182552.7U CN202122182552U CN216005264U CN 216005264 U CN216005264 U CN 216005264U CN 202122182552 U CN202122182552 U CN 202122182552U CN 216005264 U CN216005264 U CN 216005264U
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Abstract
The utility model provides a MVR evaporation crystal system contains forced circulation heat exchanger, forced circulation separator, forced circulation pump, discharge pump, centrifuge, mother liquor jar, still contains the long-pending salt and washes the mechanism and include: the centrifuge flushing assembly comprises a centrifuge body flushing pipe and a centrifuge body flushing valve; the discharging pump discharging flushing assembly comprises a discharging pump discharging flushing pipe, a discharging stop valve and a discharging pump discharging flushing valve; the discharge pump backflow flushing assembly comprises a discharge pump backflow flushing pipe, a backflow stop valve and a discharge pump backflow flushing valve; the opening and closing of the flushing valve of the centrifuge body, the discharging stop valve, the discharging pump discharging flushing valve, the backflow stop valve and the discharging pump backflow flushing valve are controlled and connected by the MVR control. The utility model discloses utilize the automatic control controlling part that opens and shuts control centrifuge body to wash subassembly, backward flow and wash, the ejection of compact washes and switches between the flushing line, realizes different stages and washes different pipelines automatically, gets rid of the problem of the long-pending salt of pipeline comprehensively.
Description
Technical Field
The utility model relates to a water treatment technical field, in particular to MVR (Mechanical Vapor Recompression) evaporative crystallization system.
Background
In order to recycle water resources and obtain clean water resources, a treatment system for water, wastewater, sewage or sludge is generally an integrated unit formed by reasonably combining several unit processes for treating wastewater. Because the types and properties of water, wastewater, sewage or sludge are very complex and the treatment purpose is different, several treatment methods (or called unit technologies) are combined and the primary and secondary relations and the sequence of the treatment methods are reasonably configured to form an organic whole so as to realize the treatment task most effectively and economically.
In the water, wastewater, sewage or sludge treatment system, when the water, wastewater, sewage or sludge distillation or evaporation system treatment loop is involved, the MVR (Mechanical Vapor Recompression) system is an important loop in the water, wastewater, sewage or sludge treatment system, and during the evaporation process, the crystallized substances can agglomerate in the separator and also be one of the causes of blockage of the heat exchange tube. In the conventional MVR evaporative crystallization system, the conventional system process route is as follows: raw material tank → heater → separator → discharge pump → centrifuge, especially in the process that the salt thick liquids get into centrifuge and realize the separation, need intermittent operation, every interval several hours, just need operating personnel to switch the ejection of compact of crystal thick liquids jar to the backflow line to each pipeline is washed by the manual work, and the inside long-pending salt of washing clearance centrifuge simultaneously.
Domestic patent CN211705949U discloses a MVR high salt waste water crystallization, goes out salt system, includes: an MVR evaporator; an inlet of the crystallizer is connected with an outlet of the MVR evaporator; an inlet of the crystal slurry pump is connected with a first outlet of the crystallizer, and an outlet of the crystal slurry pump is connected with an inlet of the MVR evaporator; and the inlet of the cantilever type spiral discharging centrifuge is connected with the second outlet of the crystallizer.
The MVR high-salt wastewater crystallization and salt discharge system is applied to industry, and still needs manual cleaning and flushing on site when the salt deposition of a centrifuge is processed. Particularly, in the process of separating salt slurry in a centrifuge, the salt slurry needs to be operated intermittently, and every several hours, operators are required to switch the discharge of a crystal slurry tank to a backflow pipeline and manually flush each pipeline; the method for washing and cleaning the salt accumulated inside the centrifuge has the defects of manpower consumption and even need of specially setting a post for the work.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is in order to overcome prior art's defect, provide one kind and can realize automatic flushing pipeline inner salt, and realize multiple washing through the permutation and combination that the valve member opened and shut, and centrifuge continuous operation's MVR evaporation crystallization system.
The utility model discloses an above-mentioned technical problem is solved through following technical scheme:
the utility model provides a MVR evaporation crystallization system contains forced circulation heat exchanger, forced circulation separator, forced circulation pump, ejection of compact pump, centrifuge, mother liquor jar, MVR evaporation crystallization system still contains the long-pending salt and washes the mechanism, the long-pending salt washes the mechanism and includes:
the centrifuge body flushing assembly is arranged on the centrifuge flushing interface and comprises a centrifuge body flushing pipe, one end of the centrifuge body flushing pipe is connected with the centrifuge flushing interface, the other end of the centrifuge body flushing pipe is externally connected with a flushing pipeline, and a centrifuge body flushing valve is arranged on the centrifuge body flushing pipe;
the discharging pump discharging flushing component is arranged on a discharging pipe of the discharging pump and comprises a discharging pump discharging flushing pipe and a discharging stop valve, the discharging stop valve is arranged on the discharging pipe of the discharging pump, one end of the discharging pump discharging flushing pipe is arranged on a branch of the discharging pipe of the discharging pump, the other end of the discharging pump discharging flushing pipe is externally connected with a flushing pipe, and a discharging pump discharging flushing valve is arranged on the discharging pump discharging flushing pipe;
the discharge pump backflow flushing assembly is arranged on a discharge pump backflow pipeline and comprises a discharge pump backflow flushing pipe and a backflow stop valve, the backflow stop valve is arranged on the discharge pump backflow pipeline, one end of the discharge pump backflow flushing pipe is arranged on a branch of the discharge pump backflow pipeline, the other end of the discharge pump backflow flushing pipe is externally connected with a flushing pipeline, and a discharge pump backflow flushing valve is arranged on the discharge pump backflow flushing pipe; and
the opening and closing of the centrifuge body flushing valve, the discharging stop valve, the discharging pump discharging flushing valve, the backflow stop valve and the discharging pump backflow flushing valve are controlled and connected by the MVR control.
Among this technical scheme, in order to solve the technical problem that centrifuge deposition can't automatic clear among the prior art, provide one kind through the permutation and combination of automatic control switching valve group, utilize the automatic control switching controlling part control centrifuge body to wash the subassembly, the backward flow washes, the ejection of compact washes the scheme that switches between the washing pipeline, realizes different stages automatic washing different pipelines, gets rid of the problem of pipeline deposition comprehensively.
Preferably, the backflow stop valve comprises a discharge pump backflow flushing front valve and a discharge pump backflow flushing rear valve, the discharge pump backflow flushing front valve is arranged at the head end of the discharge pump backflow pipeline, the discharge pump backflow flushing rear valve is arranged at the tail end of the discharge pump backflow pipeline, and the branch of the discharge pump backflow pipeline is arranged between pipelines where the discharge pump backflow flushing front valve and the discharge pump backflow flushing rear valve are located.
Among this technical scheme, further inject backward flow stop valve's part, mounted position, stop alone or whole through the stop valve to the first end both ends of discharge pump return line, realize the adjustment to the flushing line.
The discharge stop valve comprises a discharge pump discharge flushing front valve and a discharge pump discharge flushing rear valve, wherein the discharge pump discharge flushing front valve is arranged at the head end of a discharge pump discharge pipeline, the discharge pump discharge flushing rear valve is arranged at the tail end of the discharge pump discharge pipeline, and a branch of the discharge pump discharge pipeline is arranged between pipelines where the discharge pump discharge flushing front valve and the discharge pump discharge flushing rear valve are located.
Among this technical scheme, further inject ejection of compact stop valve's part, mounted position, stop alone or whole through the stop valve to the first end both ends of discharge pump discharge line, realize the adjustment to the flushing line way.
Preferably, under the normal salt discharge working condition of the centrifuge, the discharge pump backflow flushing back valve, the discharge pump backflow flushing front valve, the discharge pump backflow flushing valve, the discharge pump discharge flushing valve and the centrifuge body flushing valve are in a closed state, and the discharge pump discharge flushing front valve and the discharge pump discharge flushing back valve are in an open state.
In the technical scheme, the arrangement and combination of opening and closing of the valve group under the normal salt discharge working condition of the centrifugal machine are limited.
Preferably, under the discharging pump discharging and flushing condition, the MVR evaporation crystallization system is switched between a first discharging and flushing state and a second discharging and flushing state in sequence, wherein,
in the first discharging flushing state, the discharging pump of the forced circulation separator is in a stop state, a discharging pump backflow flushing back valve, a discharging pump backflow flushing front valve and a discharging pump backflow flushing valve are in a closed state, a centrifuge body flushing valve is in a closed state, a discharging pump discharging flushing back valve is in a closed state, and a discharging pump discharging flushing front valve and a discharging pump discharging flushing valve are in an open state;
and in the second discharging and flushing state, the discharging pump discharging and flushing front valve and the discharging pump discharging and flushing valve are in a closed state.
In the technical scheme, the arrangement and combination of opening and closing of the valve group under the discharging pump discharging and flushing working conditions are limited.
Preferably, under the condition of the discharge pump reflux flushing, the discharge pump of the forced circulation separator is in a starting state, and the MVR evaporation crystallization system is switched in sequence under a first reflux flushing state, a second reflux flushing state, a third reflux flushing state and a fourth reflux flushing state, wherein,
in a first reflux flushing state, starting a discharge pump of the forced circulation separator;
in a second backflow flushing state, the discharge pump backflow flushing back valve and the discharge pump backflow flushing front valve are in an open state, and the discharge pump backflow flushing valve, the discharge pump discharge flushing front valve, the discharge pump discharge flushing back valve and the centrifuge body flushing valve are in a closed state;
in a third backflow flushing state, the discharge pump discharge flushing valve and the centrifuge body flushing valve are in an open state;
and in a fourth backflow flushing state, the discharge pump discharge flushing valve and the centrifuge body flushing valve are in a closed state.
In the technical scheme, the arrangement and combination of opening and closing of the valve group under the working condition of backflow flushing of the discharging pump are limited.
Preferably, under the working condition of flushing by the centrifuge, the discharge pump of the forced circulation separator is in a stop state, and the MVR evaporative crystallization system is switched in sequence under a first centrifugal flushing state, a second centrifugal flushing state, a third centrifugal flushing state and a fourth centrifugal flushing state, wherein,
in a first centrifugal flushing state, the valve is in a closed state after the discharge pump is in a backflow flushing state, and the valve before the discharge pump is in the backflow flushing state and the discharge pump backflow flushing valve are in an open state;
in a second centrifugal flushing state, the valve is in an open state after the discharge pump is subjected to backflow flushing, and the valve is in a closed state before the discharge pump is subjected to backflow flushing;
in a third centrifugal flushing state, the discharging pump backflow flushing valve and the discharging pump backflow flushing valve are in a closed state;
in a fourth centrifugal flushing state, the discharge pump of the forced circulation separator is in a starting state, and the discharge valve of the discharge pump is in an opening state before discharging and flushing.
In the technical scheme, the arrangement and combination of opening and closing of the valve group under the flushing working condition of the centrifugal machine are limited.
Preferably, the MVR control includes a current sensor and a controller, the current sensor is connected to the centrifuge circuit to monitor the rated current of the centrifuge, and the current sensor is connected to the controller through a signal line.
In the technical scheme, a first MVR control judgment mode is provided, the technical problem of how to start and wash a salt accumulation washing pipeline of the centrifuge is solved, and the opening and washing of the combination of automatically controlling the opening and the closing of the valve when the rated current of a centrifuge host is larger than 10% of the rated current is realized.
Preferably, the MVR control includes a timing module and a controller, and the timing module sets a time threshold signal and is connected to the controller through a signal line.
In this technical scheme, a second MVR control judgment mode is provided, the technical problem of how to start the washing of the salt accumulation washing pipeline of the centrifuge is solved, and the automatic control valve opening and closing combination is opened to realize the washing when the time of the last washing system is more than one hour.
Preferably, the centrifuge body flushing valve, the discharge stop valve, the discharge pump discharge flushing valve, the backflow stop valve and the discharge pump backflow flushing valve comprise regulating valves or three-way valves.
Preferably, the centrifuge is a horizontal screw centrifuge.
Preferably, a thickener is additionally arranged before the centrifugal machine.
Preferably, a cyclone is additionally arranged before the centrifugal machine.
The utility model discloses an actively advance the effect and lie in:
1. the utility model relates to a MVR evaporation crystal system is exactly to the condition that often needs the inside long-pending salt of manual cleaning centrifuge among the prior art, judges centrifuge's long-pending salt condition through the controlling part, utilizes the automatic control to open and shut the controlling part control centrifuge body and washes subassembly, backward flow and wash, the ejection of compact and wash and switch between the washing tube way, realizes different stages and washes different pipelines automatically, gets rid of the problem of the long-pending salt of pipeline comprehensively, realizes the unmanned on duty continuous operation ejection of compact, can save the labour cost.
2. The utility model relates to a MVR evaporation crystal system adopts automatic washing pipeline and control assembly, realizes centrifuge continuous operation, can shorten operating time.
3. The utility model relates to a MVR evaporation crystallization system can accomplish one set of operation before stifled pipe, avoids stifled pipe risk, and it has brought economic loss, reduces the operation cost of mill.
Drawings
Fig. 1 is a device wiring diagram of the MVR evaporative crystallization system of the present invention.
Fig. 2 is the flow chart of the normal salt discharge working condition of the centrifuge of the MVR evaporative crystallization system of the present invention.
FIG. 3 is the embodiment of MVR evaporative crystallization system discharge pump discharge washes the first to second ejection of compact of operating mode and washes the state flow chart.
Figure 4A is the utility model discloses MVR evaporation crystal system's embodiment discharge pump backward flow washes the first to second backward flow of operating mode and washes state flow chart.
Figure 4B is the utility model discloses MVR evaporation crystal system's embodiment discharge pump backward flow washes operating mode third backward flow and washes state flow chart.
Fig. 5A is the utility model discloses MVR evaporation crystal system's embodiment centrifuge washes the first centrifugation of operating mode and washes state flow chart.
Figure 5B is the embodiment of MVR evaporative crystallization system of the present invention centrifuge washes operating mode second-four centrifugation washing state flow diagram.
FIG. 6 is a schematic diagram of the automatic control module of the MVR evaporative crystallization system of the present invention.
Description of the drawings
Forced circulation heat exchanger 1
Forced circulation pump 3
Discharge pump reflux flushing front valve 8
Discharge pump reflux flushing valve 9
Discharging pump discharging flushing front valve 10
Discharging pump discharging flushing valve 11
Centrifuge body flush valve 13
Centrifuge body flush tube 14
Discharging pump discharging flushing pipe 15
Discharge pump discharge line 16
Discharge pump return line 17
Discharge pump return flushing pipe 18
Centrifuge body washing assembly A
Discharging pump discharging flushing component B
And the discharge pump reflows to wash the component C.
Detailed Description
The present invention will be more clearly and completely described below with reference to the accompanying drawings.
As shown in fig. 1, in the present embodiment, an MVR evaporative crystallization system includes, for example, a forced circulation heat exchanger 1, a forced circulation separator 2, a forced circulation pump 3, a horizontal decanter centrifuge 4, a forced circulation separator discharge pump 5, and a mother liquor tank 6, where the system uses the forced circulation separator 2 as a core, and includes a circulation pipeline in which the forced circulation heat exchanger 1, the forced circulation separator 2, and the forced circulation pump 3 are located, a discharge pump discharge pipeline 16 in which the forced circulation separator 2, the forced circulation separator discharge pump 5, the horizontal decanter centrifuge 4, and the mother liquor tank 6 are located, and a discharge pump return pipeline 17 in which the forced circulation separator 2, and the forced circulation separator discharge pump 5 are located; the above piping connections may refer to any conventional layout and details are not described herein.
On the basis of the components, a thickener is additionally arranged before entering the centrifuge, and the pipeline connection can refer to any conventional layout, and details are not described herein.
On the basis of the components, a cyclone can be further added before entering the centrifuge, the pipeline connection can refer to any conventional arrangement, and details are not described herein.
In order to solve the technical problem that the accumulated salt of the centrifugal machine in the prior art cannot be automatically cleared, a continuous discharging automatic control system of the centrifugal machine is realized, a scheme for controlling the switching among flushing pipelines such as a centrifugal machine body flushing component A, a discharging pump backflow flushing component C and a discharging pump discharging flushing component B by using an automatic control opening and closing control is provided, different pipelines are automatically flushed in different stages, and the problem of the accumulated salt of the pipelines is comprehensively removed.
As shown in fig. 1, on the basis of the MVR evaporative crystallization system of the above embodiment, a salt deposition rinsing mechanism is additionally provided, and the salt deposition rinsing mechanism includes a centrifuge body rinsing component a, a discharge pump discharge rinsing component B, a discharge pump backflow rinsing component C, and an MVR control, which are detailed below:
the centrifuge washing component A is arranged on the centrifuge washing interface and comprises a centrifuge body washing pipe 14, one end of the centrifuge body washing pipe 14 is connected with the centrifuge washing interface, the other end of the centrifuge body washing pipe 14 is externally connected with a washing pipeline, and a centrifuge body washing valve 13 is arranged on the centrifuge body washing pipe 14;
the discharging pump discharging flushing component B is arranged on a discharging pump discharging pipeline 16 and comprises a discharging pump discharging flushing pipe 15 and a discharging stop valve, the discharging stop valve is arranged on the discharging pump discharging pipeline 16, one end of the discharging pump discharging flushing pipe 15 is arranged on a branch of the discharging pump discharging pipeline 16, the other end of the discharging pump discharging flushing pipe 15 is externally connected with a flushing pipeline, and a discharging pump discharging flushing valve 11 is arranged on the discharging pump discharging flushing pipe 15;
the discharge pump backflow flushing component C is arranged on the discharge pump backflow pipeline 17 and comprises a discharge pump backflow flushing pipe 18 and a backflow stop valve, the backflow stop valve is arranged on the discharge pump backflow pipeline 17, one end of the discharge pump backflow flushing pipe 18 is arranged on a branch of the discharge pump backflow pipeline 17, the other end of the discharge pump backflow flushing pipe 18 is externally connected with a flushing pipeline, and a discharge pump backflow flushing valve 9 is arranged on the discharge pump backflow flushing pipe 18; and
the opening and closing of the flushing valve of the centrifuge body, the discharging stop valve, the discharging pump discharging flushing valve, the backflow stop valve and the discharging pump backflow flushing valve are controlled and connected by the MVR control.
In this embodiment, centrifuge body flushometer, ejection of compact stop valve, discharge pump ejection of compact flushometer, backward flow stop valve, discharge pump backward flow flushometer include governing valve or three-way valve.
In this embodiment, further inject backward flow stop valve's part, mounted position, through the stop valve to the first end both ends of discharge pump return line alone or all end, realize the adjustment to washing the pipeline. Backflow stop valve, valve 7 after valve 8, the discharge pump backward flow washes before discharge pump backward flow washes, and the head end of discharge pump return line is located to discharge pump backward flow wash front valve 8, and the end of discharge pump return line is located to discharge pump backward flow wash back valve 7, and the branch road of discharge pump discharge line is located between discharge pump backward flow wash front valve 8, the pipeline that discharge pump backward flow washes back valve 7 place.
In this embodiment, further inject ejection of compact stop valve's part, mounted position, stop alone or whole through the stop valve to the first end both ends of discharge pump discharge line, realize the adjustment to washing the pipeline. Discharge stop valve, including discharge pump ejection of compact washing front valve 10, discharge pump ejection of compact washing back valve 12, discharge pump outflow washing front valve 10 locates the head end of discharge pump ejection of compact pipeline, and the end of discharge pump ejection of compact pipeline is located to discharge pump ejection of compact washing back valve, and the branch road of discharge pump ejection of compact pipeline is located between discharge pump ejection of compact washing front valve 10, discharge pump ejection of compact washing back valve 12 place pipeline.
As shown in fig. 6, in this embodiment, a first MVR control judgment mode is provided, which solves the technical problem of how to start washing a salt deposit washing pipeline of a centrifuge, and a combination that a valve is automatically controlled to open and close when a rated current of a centrifuge host is greater than 10% of the rated current is provided to start washing. The MVR control comprises a current sensor, a PLC or a DCS controller, wherein the current sensor is connected to a centrifuge circuit and monitors the rated current of the centrifuge, and the current sensor is connected with the PLC or the DCS controller through a signal line.
As shown in fig. 6, in this embodiment, a second MVR control judgment mode is provided, which solves the technical problem of how to start washing the salt deposit washing pipeline of the centrifuge, and provides a combination for automatically controlling the opening and closing of the valve when the time of washing the system last time is longer than one hour to realize opening and washing. The MVR control comprises a timing module, a PLC or a DCS controller, wherein the timing module is used for setting a time threshold signal and is in control connection with the PLC or the DCS controller through a signal line.
As shown in fig. 6, when the rated current of the centrifuge main machine is larger than 10% of the rated current, or the time is longer than one hour from the last time of flushing the system, the following working conditions are carried out in sequence:
as shown in fig. 2, in the present embodiment, an arrangement combination of opening and closing of the valve set under a normal salt discharge condition of the centrifuge is defined. Under the normal salt discharging working condition of the centrifuge, the discharging pump backflow flushing back valve 7, the discharging pump backflow flushing front valve 8, the discharging pump backflow flushing valve 9, the discharging pump discharging flushing valve 11 and the centrifuge body flushing valve 13 are in a closed state, and the discharging pump discharging flushing front valve 10 and the discharging pump discharging flushing back valve 12 are in an open state. The flow path is shown in the figure, the forced circulation separator 2, the discharge pump 5 of the forced circulation separator, the discharge pump discharge flushing front valve 10, the discharge pump discharge flushing rear valve 12 and the horizontal screw centrifuge 4.
As shown in fig. 3, in this embodiment, the arrangement and combination of the opening and closing of the valve set under the discharging pump discharging and flushing conditions are defined. Under the working condition of discharging pump discharging flushing, in a first discharging flushing state, the discharging pump 5 of the forced circulation separator is in a stop state, the discharging pump backflow flushing back valve 7, the discharging pump backflow flushing front valve 8 and the discharging pump backflow flushing valve 9 are in a closed state, the centrifuge body flushing valve 13 is in a closed state, and the discharging pump discharging flushing back valve 12 is in a closed state; the discharging pump discharging flushing front valve 10 and the discharging pump discharging flushing valve 11 are in an open state, and the flow paths are as shown in the figure: a discharge pump discharge flushing valve 11, a discharge pump discharge flushing front valve 10, and a forced circulation separator discharge pump 5. And in a second discharging and flushing state, the discharging pump discharging and flushing front valve 10 and the discharging pump discharging and flushing valve 11 are in a closed state.
As shown in fig. 4A-4B, in the present embodiment, the valve set is limited to be opened and closed under the condition of the discharge pump backflow flushing. Under the working condition of the discharge pump reflux flushing, the discharge pump 5 of the forced circulation separator is in a starting state, and the MVR evaporation crystallization system is switched in sequence under a first reflux flushing state, a second reflux flushing state, a third reflux flushing state and a fourth reflux flushing state, wherein,
in a first reflux flushing state, a discharge pump 5 of the forced circulation separator is started;
in the second reflux flushing state, the discharge pump reflux flushing back valve 7 and the discharge pump reflux flushing front valve 8 are in an open state, the discharge pump reflux flushing valve 9, the discharge pump discharge flushing front valve 10, the discharge pump discharge flushing valve 11, the discharge pump discharge flushing back valve 12 and the centrifuge body flushing valve 13 are in a closed state, and the centrifuge automatically reduces the frequency to a proper flushing frequency; the flow path direction is shown in the figure, the forced circulation separator 2, the discharge pump 5 of the forced circulation separator, the discharge pump backflow flushing front valve 8, the discharge pump backflow flushing rear valve 7 and the forced circulation separator 2.
In the third reflux flushing state, the discharge pump discharge flushing valve 11, the discharge pump discharge flushing back valve 12 and the centrifuge body flushing valve 13 are in an open state; the two flow paths are shown in the figure: a discharge pump discharge flushing valve 11, a discharge pump discharge flushing back valve 12, a horizontal screw centrifuge 4 and a mother liquor tank 6; centrifuge body flush valve 13-horizontal decanter centrifuge 4.
In the fourth backflow flushing state, the discharge pump discharge flushing valve 11 and the centrifuge body flushing valve 13 are closed.
As shown in fig. 5A-5B, in the present embodiment, the valve set is defined to be opened and closed in the flushing operation of the centrifuge. Under the working condition of flushing of the centrifugal machine, the discharge pump 5 of the forced circulation separator is in a stop state, and the MVR evaporation crystallization system is sequentially switched among a first centrifugal flushing state, a second centrifugal flushing state, a third centrifugal flushing state and a fourth centrifugal flushing state, wherein,
in the first centrifugal flushing state, the discharging pump backflow flushing back valve 7 is in a closed state, and the discharging pump backflow flushing front valve 8 and the discharging pump backflow flushing valve 9 are in an open state; the flow path is as shown in fig. 5A, discharge pump reflux flushing valve 9-discharge pump reflux flushing front valve 8-discharge pump reflux flushing back valve 7.
In a second centrifugal flushing state, the valve 8 is closed before the discharge pump reflows and flushes, and the valve 7 is opened after the discharge pump reflows and flushes;
in the third centrifugal flushing state, the discharge pump backflow flushing back valve 7 is closed, and the discharge pump backflow flushing valve 9 is closed.
In the fourth centrifugal washing state, the discharge pump 5 of the forced circulation separator is started, the valve 10 is opened by 10% of opening every 1s before the discharge pump discharges and washes, the valve opening is maintained until the centrifuge reaches the rated current, and the flow path is as shown in fig. 5B.
To sum up, the utility model discloses MVR evaporation crystal system's operation process description:
in the normal operation process of the system, under the normal salt discharge working condition of the centrifuge, the discharge pump backflow flushing back valve 7, the discharge pump backflow flushing front valve 8, the discharge pump backflow flushing valve 9, the discharge pump discharge flushing valve 11 and the centrifuge body flushing valve 13 are in a closed state, the discharge pump discharge flushing front valve 10 and the discharge pump discharge flushing back valve 12 are in an open state. And (5) normally discharging salt by using a centrifuge.
When two conditions are met (time > one hour from last system flushing, or actual current > 10% rated current of the main frame of the centrifuge) the system performs the following interlocking operations in sequence:
(1) under the operating mode is washed in the ejection of compact pump ejection of compact, first ejection of compact washout state, forced circulation separator ejection of compact pump 5 stops, and valve 12 is closed after the ejection of compact pump ejection of compact washout, and ejection of compact pump ejection of compact flushometer 11 is opened, lasts 7 seconds after, second ejection of compact washout state, ejection of compact pump ejection of compact washing front valve 10, ejection of compact pump ejection of compact flushometer 11 are closed.
(2) Under the working condition of discharge pump reflux flushing, the discharge pump 5 of the forced circulation separator is started in a first reflux flushing state, and in a second reflux flushing state, the valves 7 and 8 are opened after 0.3 second after the discharge pump reflux flushing. The centrifuge starts to reduce the frequency to the washing frequency (different manufacturers refer to operation specifications of different manufacturers), in a third backflow washing state, the discharge pump discharge washing valve 11, the discharge pump discharge washing back valve 12 and the centrifuge body washing valve 13 are opened after the frequency reduction is finished, and in a fourth backflow washing state, the discharge pump discharge washing valve 11 and the centrifuge body washing valve 13 are closed after 10 seconds. The centrifuge begins to ramp the frequency to the normal operating frequency.
(3) At the moment, under the working condition of washing of the centrifugal machine, in a first centrifugal washing state, the discharge pump 5 of the forced circulation separator stops, the valve 7 is closed after the discharge pump reflows and washes, and the discharge pump reflows and washes the valve 9 and opens. After 3 seconds, in the second centrifugal flushing state, the discharging pump backflow flushing front valve 8 is closed, the discharging pump backflow flushing rear valve 7 is opened, and after 3 seconds, in the third centrifugal flushing state, the discharging pump backflow flushing rear valve 7 is closed, and the discharging pump backflow flushing valve 9 is closed. In the fourth centrifugal flushing state, the discharge pump 5 of the forced circulation separator is started, the discharge pump discharges materials to flush the front valve 10, the opening of the front valve is opened by 10% every 1s, and the opening of the front valve is kept until the centrifugal machine reaches the rated current.
(4) The centrifuge runs for a long time, and when the time is more than one hour from the last system flushing or the rated current of the main machine of the centrifuge is more than 10 percent when two conditions are met, the system repeats the operations of (1), (2) and (3) in sequence.
The state of each valve at each stage is detailed in the following table: (wherein the serial number before the switch in the table represents the operation sequence of the switch at the current stage, and the no serial number represents the no-switch operation at the current stage)
Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are examples only and that the scope of the present invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are all within the scope of the invention.
Claims (10)
1. The utility model provides a MVR evaporative crystallization system, contains forced circulation heat exchanger, forced circulation separator, forced circulation pump, discharge pump, centrifuge, mother liquor jar, its characterized in that, MVR evaporative crystallization system still contains the salt deposition and washes the mechanism, the salt deposition washes the mechanism and includes:
the centrifuge body flushing assembly is arranged on the centrifuge flushing interface and comprises a centrifuge body flushing pipe, one end of the centrifuge body flushing pipe is connected with the centrifuge flushing interface, the other end of the centrifuge body flushing pipe is externally connected with a flushing pipeline, and a centrifuge body flushing valve is arranged on the centrifuge body flushing pipe;
the discharging pump discharging flushing component is arranged on a discharging pipe of the discharging pump and comprises a discharging pump discharging flushing pipe and a discharging stop valve, the discharging stop valve is arranged on the discharging pipe of the discharging pump, one end of the discharging pump discharging flushing pipe is arranged on a branch of the discharging pipe of the discharging pump, the other end of the discharging pump discharging flushing pipe is externally connected with a flushing pipe, and a discharging pump discharging flushing valve is arranged on the discharging pump discharging flushing pipe;
the discharge pump backflow flushing assembly is arranged on a discharge pump backflow pipeline and comprises a discharge pump backflow flushing pipe and a backflow stop valve, the backflow stop valve is arranged on the discharge pump backflow pipeline, one end of the discharge pump backflow flushing pipe is arranged on a branch of the discharge pump backflow pipeline, the other end of the discharge pump backflow flushing pipe is externally connected with a flushing pipeline, and a discharge pump backflow flushing valve is arranged on the discharge pump backflow flushing pipe; and
the opening and closing of the centrifuge body flushing valve, the discharging stop valve, the discharging pump discharging flushing valve, the backflow stop valve and the discharging pump backflow flushing valve are controlled and connected by the MVR control.
2. The MVR evaporative crystallization system according to claim 1, wherein the backflow stop valve comprises a discharge pump backflow flushing front valve and a discharge pump backflow flushing rear valve, the discharge pump backflow flushing front valve is disposed at a head end of the discharge pump backflow pipeline, the discharge pump backflow flushing rear valve is disposed at a tail end of the discharge pump backflow pipeline, and a branch of the discharge pump backflow pipeline is disposed between pipelines where the discharge pump backflow flushing front valve and the discharge pump backflow flushing rear valve are located.
3. The MVR evaporative crystallization system according to claim 2, wherein the discharge stop valve comprises a discharge pump discharge flushing front valve and a discharge pump discharge flushing rear valve, the discharge pump discharge flushing front valve is disposed at a head end of the discharge pump discharge pipeline, the discharge pump discharge flushing rear valve is disposed at a tail end of the discharge pump discharge pipeline, and a branch of the discharge pump discharge pipeline is disposed between the discharge pump discharge flushing front valve and the discharge pump discharge flushing rear valve.
4. The MVR evaporative crystallization system according to claim 1, 2 or 3, wherein under normal salt discharge conditions of the centrifuge, the discharge pump back flow flushing post valve, the discharge pump back flow flushing pre valve, the discharge pump back flow flushing post valve, the discharge pump discharge flushing post valve, and the centrifuge body flushing post valve are in a closed state, and the discharge pump discharge flushing pre valve and the discharge pump discharge flushing post valve are in an open state.
5. The MVR evaporative crystallization system according to claim 1, 2 or 3, wherein under the discharge pump discharge flushing condition, the MVR evaporative crystallization system is sequentially switched between a first discharge flushing state and a second discharge flushing state, wherein,
in the first discharging flushing state, the discharging pump of the forced circulation separator is in a stop state, a discharging pump backflow flushing back valve, a discharging pump backflow flushing front valve and a discharging pump backflow flushing valve are in a closed state, a centrifuge body flushing valve is in a closed state, a discharging pump discharging flushing back valve is in a closed state, and a discharging pump discharging flushing front valve and a discharging pump discharging flushing valve are in an open state;
and in the second discharging and flushing state, the discharging pump discharging and flushing front valve and the discharging pump discharging and flushing valve are in a closed state.
6. The MVR evaporative crystallization system according to claim 3, wherein the discharge pump of the forced circulation separator is activated under a condition of discharge pump back flushing, and the MVR evaporative crystallization system is sequentially switched among a first back flushing state, a second back flushing state, a third back flushing state and a fourth back flushing state, wherein,
in a first reflux flushing state, a discharge pump of the forced circulation separator is started;
in a second backflow flushing state, the discharge pump backflow flushing back valve and the discharge pump backflow flushing front valve are in an open state, and the discharge pump backflow flushing valve, the discharge pump discharge flushing front valve, the discharge pump discharge flushing back valve and the centrifuge body flushing valve are in a closed state;
in a third backflow flushing state, the discharge pump discharge flushing valve and the centrifuge body flushing valve are in an open state;
and in a fourth backflow flushing state, the discharge pump discharge flushing valve and the centrifuge body flushing valve are in a closed state.
7. The MVR evaporative crystallization system of claim 3, wherein the forced circulation separator discharge pump is stopped under a centrifuge rinse condition, and the MVR evaporative crystallization system is sequentially switched among a first centrifugal rinse condition, a second centrifugal rinse condition, a third centrifugal rinse condition and a fourth centrifugal rinse condition,
in a first centrifugal flushing state, the valve is in a closed state after the discharge pump is in a backflow flushing state, and the valve before the discharge pump is in the backflow flushing state and the discharge pump backflow flushing valve are in an open state;
in a second centrifugal flushing state, the valve is in an open state after the discharge pump is subjected to backflow flushing, and the valve is in a closed state before the discharge pump is subjected to backflow flushing;
in a third centrifugal flushing state, the discharging pump backflow flushing valve and the discharging pump backflow flushing valve are in a closed state;
in a fourth centrifugal flushing state, the discharge pump of the forced circulation separator is in a starting state, and the discharge valve of the discharge pump is in an opening state before discharging and flushing.
8. The MVR evaporative crystallization system of claim 1, wherein the MVR control comprises a current sensor and a controller, the current sensor is connected to the centrifuge circuit and monitors the rated current of the centrifuge, and the current sensor is connected to the controller through a signal line.
9. The MVR evaporative crystallization system of claim 1, wherein the MVR control comprises a timing module and a controller, wherein the timing module sets a time threshold signal and is in control connection with the controller through a signal line.
10. The MVR evaporative crystallization system of claim 1, wherein the centrifuge body flush valve, the discharge stop valve, the discharge pump discharge flush valve, the backflow stop valve, the discharge pump backflow flush valve comprise a regulating valve or a three-way valve, and/or
The centrifuge is a horizontal screw centrifuge, and/or
A thickener is additionally arranged in front of the centrifugal machine, and/or
A swirler is additionally arranged in front of the centrifugal machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122182552.7U CN216005264U (en) | 2021-09-09 | 2021-09-09 | MVR evaporation crystallization system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122182552.7U CN216005264U (en) | 2021-09-09 | 2021-09-09 | MVR evaporation crystallization system |
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| Publication Number | Publication Date |
|---|---|
| CN216005264U true CN216005264U (en) | 2022-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122182552.7U Active CN216005264U (en) | 2021-09-09 | 2021-09-09 | MVR evaporation crystallization system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216005264U (en) |
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2021
- 2021-09-09 CN CN202122182552.7U patent/CN216005264U/en active Active
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Address after: 315700 no.929 Binhai Avenue, Danxi street, Xiangshan County, Ningbo City, Zhejiang Province (main building) 1802-01 Patentee after: China Film (Zhejiang) Environmental Protection Technology Co.,Ltd. Address before: 315700 no.929 Binhai Avenue, Danxi street, Xiangshan County, Ningbo City, Zhejiang Province (main building) 1802-01 Patentee before: Sinochem (Zhejiang) Membrane Industry Development Co.,Ltd. |