CN220514089U - Flocculant blending system and lyocell fiber solvent recycling pretreatment system - Google Patents

Abstract

The utility model relates to a flocculant blending system and a lyocell fiber solvent recycling pretreatment system, which comprise a blending device, a conveying pipeline, a backflow pipeline, an adjusting pump, an adjusting valve and a temporary storage device, wherein the temporary storage device comprises a storage cavity and a first overflow port communicated with the storage cavity; the system has the advantages of lower cost, simpler adding process, accurate and controllable adding amount, and can meet the flocculation requirement of a larger flow of dilute solvent through the cooperation of the temporary storage device, the conveying pipeline, the reflux pipeline and the regulating valve, thereby being beneficial to improving the universality, and being difficult to cause the situation of overflow and leakage of the flocculant, so that the flocculant is more stable in the blending and adding process.

Description

Flocculant blending system and lyocell fiber solvent recycling pretreatment system

Technical Field

The utility model relates to the technical field of lyocell fiber solvent recovery production, in particular to a flocculant blending system and a lyocell fiber solvent recovery pretreatment system.

Background

Lyocell is a synthetic fiber made from wood pulp fibers. The preparation process of the lyocell fiber comprises the steps of putting wood pulp into a solvent to form fiber paste, and forming the fiber by a spinning technology. The solvent for producing the lyocell fiber is an environment-friendly solvent (NMMO solution is usually adopted as the solvent, N-methylmorpholine-N-oxide is also called methylmorpholine oxide), and the solvent can be regenerated and recovered, so that the emission of chemical waste and the pollution to the environment in the production process of the lyocell fiber can be effectively reduced.

In the conventional lyocell fiber production system, a lyocell fiber solvent recovery system (abbreviated as solvent recovery system) is generally configured, and the solvent recovery system is mainly used for recovering a solvent. In the production of lyocell, the coagulation bath generally contains a plurality of components including solid impurities carried in by the body, cellulose with low polymerization degree, lignin, hemicellulose, other high molecular impurities, most of colored substances, insoluble oily emulsion, slightly oil-soluble substances, most of high-valence metal ions and the like. Wherein, the solid impurities exist in a colloid form, the particle size is generally less than or equal to 0.1um, the particles cannot be removed in a filtering form, the particle size is gradually increased in a trapping and flocculating mode, and then the particles are removed by air floatation. Flocculation generally refers to the process of collecting and enlarging or forming flocks of suspended particles in water or liquid, thereby accelerating the coagulation of particles and achieving the purpose of separating the suspended particles in the liquid.

In the lyocell fiber solvent recovery system, flocculation is to add a polyacrylamide flocculant to a recovered thin solvent (usually from a spinning stock solution and a NMMO thin solvent waste liquid recovered from spinning, abbreviated as a thin solvent, not specifically limited to a low concentration, and not described in detail later) to remove solid and colloidal insoluble impurities therein, and then remove flocculates by sedimentation or air floatation. For example, chinese patent CN109772022a discloses a pretreatment method for recovering solvent, in which a flocculation and fractional precipitation device is added before the recovered diluted solvent is fed into a filter for filtration, so that the recovered diluted solvent is flocculated, then multistage precipitation is performed, so that pretreatment is performed on the diluted solvent before filtration, and finally the diluted solvent is fed into the filter for filtration. In the conventional pretreatment method, flocculation is an important link, in the conventional design, a flocculant preparation system generally comprises a flocculant preparation tank for preparing a flocculant, the flocculant preparation tank is provided with an output pipeline, the output pipeline is connected with a coagulation container and is communicated with a conveying pump, and the flocculant with prepared concentration in the flocculant preparation tank enters the coagulation container through the output pipeline under the action of the conveying pump, so that a dilute solvent and the flocculant can be mixed in the coagulation container and undergo flocculation reaction. However, in the actual operation process, the adding amount of the flocculant needs to be controlled according to the flow of the thin solvent, when the flow of the thin solvent is large, the amount of the flocculant needed is large, and when the flow of the thin solvent is small, the amount of the flocculant needed is small, so that the flocculant blending system of the conventional design needs to be provided with a delivery pump with adjustable output power, the cost is high, and in the actual operation process, the delivery pump needs to be frequently regulated, in addition, the problem that too many flocculants are in a flocculant blending tank are caused due to the fact that the adding amount is reduced easily occurs, the adding amount is increased easily, the amount of the flocculant in the flocculant blending tank is insufficient, and the problem that the blending is required to be waited is also caused, so that the stability and the universality of the flocculant blending system are poor, and the problem to be solved is needed.

Disclosure of Invention

In order to solve the technical problems, the first aspect of the utility model provides a more stable flocculant allocation system, which adopts an overflow mode to add flocculant, has lower cost and simpler adding process, can meet the flocculation requirement of a larger flow of dilute solvent, is beneficial to improving the universality, and is not easy to cause overflow and leakage of flocculant, and the main conception is as follows:

a flocculating agent blending system comprises a blending device, a conveying pipeline, a reflux pipeline, an adjusting pump, an adjusting valve and a temporary storage device, wherein,

the blending device comprises a blending cavity for blending the flocculant,

the temporary storage device comprises a storage cavity for storing flocculant and a first overflow port communicated with the storage cavity,

the inlet of the regulating pump is communicated with the blending cavity, the outlet of the regulating pump is respectively communicated with the conveying pipeline and the return pipeline, the conveying pipeline is communicated with the storage cavity, the return pipeline is communicated with the blending cavity,

the regulating valve is used for regulating the output quantity and the reflux quantity of the flocculant in the blending cavity. In the scheme, the temporary storage device is arranged on the basis of the blending device, so that the storage capacity of the flocculant can be effectively increased, the flocculation requirement of a larger flow of dilute solvent can be met at low cost, the universality is improved, and the problems of overflow, leakage and the like of the flocculant can be effectively prevented; by arranging the first overflow port on the temporary storage device, the flocculant can be output in an overflow mode, power is not required to be arranged, the cost is reduced, the adding process of the flocculant is simplified, and the output quantity of the flocculant in the temporary storage device is easier to accurately control; through configuration regulating pump to for the output of the interior flocculating agent of allotment cavity provides power, simultaneously, through the cooperation of pipeline, backflow pipeline and governing valve three, so that adjust output and the reflux volume of flocculating agent in the allotment cavity, both be favorable to stabilizing temporary storage device's liquid level, make the overflow speed of first overflow mouth accurate, controllable, can be under the too much circumstances of flocculating agent in temporary storage device again, make the flocculating agent can circulate in allotment device, avoid the flocculating agent in the temporary storage device to appear overflowing, leak scheduling problem, and can keep regulating pump to be in running state always, need not to start repeatedly to stop regulating pump, both be favorable to protecting the regulating pump, can effectively improve response speed and throwing and add efficiency again.

In some schemes, the three-way regulating valve adopted by the regulating valve comprises an inlet and two outlets, the outlet of the regulating pump is communicated with the inlet of the three-way regulating valve, and the conveying pipeline and the return pipeline are respectively communicated with the two outlets of the three-way regulating valve. So as to adjust the output quantity and the reflux quantity of the flocculating agent by the adjusting valve.

In some schemes, the two regulating valves are respectively a first regulating valve and a second regulating valve, and the first regulating valve and the second regulating valve are respectively arranged on the conveying pipeline and the reflux pipeline. So as to respectively regulate the flow of the flocculating agent in the conveying pipeline and the reflux pipeline through two regulating valves.

In order to prevent the temporary storage device from overflowing, leaking and other problems of the flocculating agent, the temporary storage device further comprises a second overflow port communicated with the storage cavity, the second overflow port is higher than the first overflow port, and the second overflow port is communicated with the blending cavity through a pipeline. When the liquid level in the storage cavity reaches the preset height, the redundant flocculant can return to the blending cavity through the second overflow port, so that the problems of overflow and leakage of the flocculant and the like of the temporary storage device are effectively prevented.

Further, the blending device is also provided with a stirrer. So as to be uniformly mixed and prepared into flocculant with a certain concentration.

Further, the temporary storage device is also provided with a stirrer. Preventing the flocculant from precipitating in the temporary storage device.

Further, the allocating device and/or the temporary storage device are respectively provided with a liquid level monitoring module. The liquid level is convenient to observe.

The second aspect of the utility model solves the problem of accurately preparing the concentration of the flocculant, and further comprises a conveying device for conveying the solid flocculant and a water pipe for conveying water, wherein,

the conveying device is communicated with the blending cavity, the conveying device is provided with a fixed weighing meter, the fixed weighing meter is electrically connected with the controller,

the water pipe is communicated with the allocation cavity, and is provided with a flowmeter which is electrically connected with the controller. In the scheme, the conveying device and the water pipe are respectively used for conveying solid flocculant and water for preparing flocculant solution; the fixed weighing meter is configured and electrically connected with the controller so as to accurately convey and meter the solid flocculant, and the flowmeter is configured and electrically connected with the controller so as to accurately convey and meter the water, so that the aim of accurately regulating the concentration of the flocculant is fulfilled.

A pretreatment system for recycling lyocell fiber solvent comprises a solvent conveying pipe, a coagulation device and a flocculant blending system, wherein,

the coagulation device is constructed with a coagulation cavity,

the solvent conveying pipe is communicated with the coagulation cavity, and the first overflow port is communicated with the coagulation cavity through an overflow pipeline. So that the flocculant and the dilute solvent conveyed by the solvent conveying pipe can be contacted and mixed in the coagulation cavity of the coagulation device so as to carry out flocculation reaction.

The third aspect of the utility model solves the problem of precisely controlling the adding amount of the flocculant, and further, the solvent conveying pipe is provided with a first flow monitoring module for monitoring the flow, the overflow pipeline is provided with a third regulating valve and a second flow monitoring module for monitoring the flow,

the first flow monitoring module, the second flow monitoring module and the third regulating valve are respectively and electrically connected with the controller. In the scheme, the first flow monitoring module is configured, so that the amount of the dilute solvent conveyed in the solvent conveying pipe can be accurately monitored and fed back to the controller; the second flow monitoring module is configured to accurately monitor the amount of the flocculant, and the third regulating valve is configured to effectively regulate the flow of the overflow pipeline, so that the flocculant with corresponding dosage is automatically added according to the amount of the dilute solvent, and a better flocculation effect is realized; and the control process is simple, convenient and quick.

Preferably, the first flow monitoring module adopts an electromagnetic flowmeter, and/or the second flow monitoring module adopts an electromagnetic flowmeter.

Further, the coagulation device is also provided with a stirrer. So that the dilute solvent and the flocculant are fully contacted and uniformly mixed, thereby being beneficial to realizing better coagulation effect and improving coagulation efficiency.

For better separation of the flocculation group, one or more sedimentation tanks connected in series are further arranged at the downstream of the coagulation device, and the coagulation device is communicated with the sedimentation tanks through pipelines. So that the liquid after flocculation is subjected to sedimentation treatment by using a sedimentation tank, and flocculated masses in the liquid are effectively separated.

Further, the bottom of the coagulation cavity is constructed into a conical structure, the bottom of the coagulation cavity is communicated with the sedimentation tank through the pipeline, and the pipeline is provided with a valve.

Compared with the prior art, the flocculant blending system and the lyocell fiber solvent recovery pretreatment system provided by the utility model have the advantages that the flocculant is added in an overflow mode, the cost is lower, the adding process is simpler, the adding amount is accurate and controllable, the flocculation requirement of a larger flow of dilute solvent can be met through the cooperation of the temporary storage device, the conveying pipeline, the backflow pipeline and the regulating valve, the universality is improved, the overflow and leakage of the flocculant are not easy to occur, and the blending and adding processes of the flocculant are stable.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a flocculant blending system provided in embodiment 1 of the present utility model.

FIG. 2 is a schematic diagram of another flocculant dispensing system in accordance with example 1 of the present utility model.

Fig. 3 is a schematic structural diagram of a flocculant blending system provided in embodiment 2 of the present utility model.

Fig. 4 is a schematic structural diagram of a flocculant blending system provided in embodiment 3 of the present utility model.

Description of the drawings

Dispensing device 1, dispensing cavity 11, delivery device 12, fixed scale 13, water pipe 14, flow meter 15

Regulating pump 2, delivery line 21, return line 22, line 23

Temporary storage device 3, storage cavity 31, first overflow port 32, second overflow port 33

Three-way regulating valve 4, first regulating valve 41, second regulating valve 42

Stirrer 51, liquid level monitoring module 52

Overflow pipe 6, first flow monitoring module 61, second flow monitoring module 62, third regulating valve 63

Solvent delivery pipe 7, coagulation device 8, coagulation cavity 81, ball valve 82, sedimentation tank 9.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model.

Example 1

In this embodiment, a flocculant blending system is provided, which comprises a blending device 1, a conveying pipeline 21, a backflow pipeline 22, a regulating pump 2, a regulating valve and a temporary storage device 3, wherein,

as shown in fig. 1, the blending device 1 comprises a blending cavity 11 for blending the flocculant, and the blending cavity 11 is used for providing space for blending the flocculant. In practice, the dispensing device 1 comprises a dispensing tank, in which the dispensing cavity 11 is configured. Meanwhile, the blending device 1 is further provided with a stirrer 51, as shown in fig. 1, the stirrer 51 is arranged in the blending tank, the stirrer 51 can be an existing stirrer 51, for example, the stirrer 51 comprises a motor, a transmission rod connected with the motor in a transmission manner and a plurality of blades arranged on the rotation rod, the motor can be fixed in the blending tank, and the blades are positioned in the blending tank so as to rotate by using the motor to drive the blades, so that the purpose of stirring is achieved, and the stirring is uniform, and the flocculant with a certain concentration is blended.

As shown in fig. 1, the temporary storage device 3 includes a storage cavity 31 for storing the flocculant and a first overflow port 32 communicating with the storage cavity 31, and in practice, the temporary storage device 3 may include a temporary storage tank in which the storage cavity 31 may be constructed as shown in fig. 1. Similarly, the temporary storage device 3 is also provided with a stirrer 51, as shown in fig. 1, to prevent the flocculant from precipitating in the temporary storage device 3.

In this embodiment, the inlet of the regulating pump 2 is communicated with the blending cavity 11, and at the same time, the outlet of the regulating pump 2 is respectively communicated with the conveying pipeline 21 and the return pipeline 22, as shown in fig. 1, the conveying pipeline 21 is communicated with the storage cavity 31 so as to input the configured flocculant into the temporary storage device 3, and at the same time, the return pipeline 22 is communicated with the blending cavity 11 so as to return the output flocculant into the blending device 1.

In this embodiment, the adjusting valve is used to adjust the output and the reflux amount of the flocculant in the blending cavity 11, so as to meet the requirements of different situations, and is beneficial to improving the universality and the stability of the system. In practice, the regulating valve has various embodiments, as an example, the three-way regulating valve 4 is adopted as the regulating valve, as shown in fig. 1, the three-way regulating valve 4 comprises an inlet and two outlets, the inlet can be regulated to be communicated with one outlet by the three-way regulating valve 4, the outlet of the regulating pump 2 is communicated with the inlet of the three-way regulating valve 4 during assembly, and meanwhile, the conveying pipeline 21 and the return pipeline 22 are respectively communicated with the two outlets of the three-way regulating valve 4 so as to effectively regulate the output quantity and the return quantity of the flocculating agent through the regulating valve. Another example of the group i starves, which includes two regulating valves, as shown in fig. 2, which are a first regulating valve 41 and a second regulating valve 42, respectively, for convenience of explanation, the first regulating valve 41 and the second regulating valve 42 are provided in the transfer pipe 21 and the return pipe 22, respectively, as shown in fig. 2, so that the flow rate of the flocculant in the transfer pipe 21 and the return pipe 22 is regulated by the two regulating valves, respectively. In implementation, the first regulating valve 41 and the second regulating valve 42 may be electromagnetic regulating valves.

In order to prevent the temporary storage device 3 from overflowing and leaking the flocculating agent, in a further scheme, the temporary storage device 3 further comprises a second overflow port 33 communicated with the storage cavity 31, wherein the second overflow port 33 is higher than the first overflow port 32, as shown in fig. 1 or 2, the second overflow port 33 is communicated with the blending cavity 11 through a pipeline 23, and the second overflow port 33 is higher than the blending cavity 11 so as to realize an overflow function. In actual use, when the liquid level in the storage cavity 31 reaches the preset height, the excessive flocculant can be returned into the blending cavity 11 through the second overflow port 33, so that the problems of overflow, leakage and the like of the flocculant are effectively prevented from occurring in the temporary storage device 3.

Of course, in a more sophisticated solution, the deployment device 1 is also provided with a level monitoring module 52, as shown in fig. 2, in order to observe the level of the liquid inside the deployment device 1. Similarly, the temporary storage device 3 is also provided with a liquid level monitoring module 52, as shown in fig. 2, so as to observe the liquid level in the temporary storage device 3. The fluid level monitoring module 52 has various embodiments, for example, the fluid level monitoring module 52 may employ existing fluid level gauges, which both monitor fluid level and facilitate on-site viewing of fluid level. For another example, the level monitoring module 52 may include a level sensor electrically connected to the controller to collect the level of the liquid with the level sensor and feed the level to the controller for relevant control by the controller, such as controlling an alarm when the level is too high. Based on this, in a still further solution, the first regulating valve 41 and the second regulating valve 42 may be electrically connected to the controller, respectively, so that the controller may automatically control the reflux amount of the flocculant according to the collected liquid level height of the storage cavity 31 and the liquid level height of the deployment cavity 11, thereby realizing automatic control. In implementation, the controller may preferably adopt a PLC, a single chip microcomputer, a PC, or the like.

In the flocculant blending system provided by the embodiment, the temporary storage device 3 is further configured on the basis of the blending device 1, so that the storage capacity of the flocculant can be effectively increased, the flocculation requirement of a larger flow of dilute solvent can be met at low cost, the universality is improved, and the problems of overflow, leakage and the like of the flocculant can be effectively prevented; by arranging the first overflow port 32 on the temporary storage device 3, the flocculant can be output in an overflow mode, power is not required to be arranged, the cost is reduced, the adding process of the flocculant is simplified, and the output quantity of the flocculant in the temporary storage device 3 is easier to accurately control; through configuration regulating pump 2 to for the output of the interior flocculating agent of allotment cavity 11 provides power, simultaneously, through the cooperation of pipeline 21, return conduit 22 and governing valve three, so that adjust output and the reflux volume of flocculating agent in the allotment cavity 11, both be favorable to stabilizing the liquid level of temporary storage device 3, make overflow speed of first overflow mouth 32 accurate, controllable, can make the flocculating agent can circulate in allotment device 1 again under the too much circumstances of flocculating agent in temporary storage device 3, avoid the flocculating agent in the temporary storage device 3 to appear overflowing, leak scheduling problem, and can keep regulating pump 2 in running state always, need not to start and stop regulating pump 2 repeatedly, both be favorable to protecting regulating pump 2, can effectively improve response speed and dosing efficiency again.

In practice, the temporary storage device 3 may be installed at a position higher than the dispensing device 1 so as to overflow the output flocculant. In practical use, a proper amount of water can be added into the blending cavity 11 of the blending device 1, deionized water is preferentially adopted, and a proper amount of solid flocculant is added, so that the solid flocculant and water are fully mixed under the stirring action of the stirrer 51 to prepare a flocculant solution with a required concentration (flocculant for short, which will not be described in detail later), the prepared flocculant is conveyed into the temporary storage device 3 by the regulating pump 2 and overflows out through the first overflow port 32 of the temporary storage device 3, and the adding of the flocculant is realized.

Example 2

In order to facilitate accurate concentration adjustment of the flocculant, the main difference between the present embodiment 2 and the above embodiment 1 is that the flocculant adjustment system provided in this embodiment further includes a conveying device 12 for conveying the solid flocculant (usually in the form of particles and powder), and a water pipe 14 for conveying water, as shown in fig. 3, wherein,

as shown in fig. 3, the conveying device 12 is provided with a fixed weighing scale 13, and the conveying device 12 is communicated with the blending cavity 11 so as to input the weighed solid flocculant into the blending cavity 11 for blending, the fixed weighing scale 13 is electrically connected with the controller, in implementation, the fixed weighing scale 13 can preferably adopt a belt weighing scale, and the conveying device 12 can comprise a belt conveyor so as to convey the solid flocculant.

In this embodiment, as shown in fig. 3, the water pipe 14 is communicated with the dispensing cavity 11, the water pipe 14 is provided with a flow meter 15, and the flow meter 15 is electrically connected with a controller so as to feed back the amount of water inputted into the dispensing cavity 11. In one embodiment, the water pipe 14 can deliver water into the dispensing cavity 11 in an overflow manner, at this time, the water pipe 14 is provided with a valve which is electrically connected with the controller so as to control the flow rate and achieve the purpose of controlling the input quantity, and in another embodiment, the water pipe 14 can be connected with a pump, at this time, the pump can be electrically connected with the controller so as to achieve the purpose of controlling the input quantity by controlling the pump. Of course, in implementation, the pump and the flowmeter 15 may be integrated, and in this case, a metering pump may be used, and the metering pump is electrically connected to the controller, so that power can be provided for water delivery, and the delivered water amount can be metered.

In use, the delivery device 12 and the water pipe 14 deliver a solid flocculant and water, respectively, with the flocculant solution disposed therein; by configuring fixed scale 13 and electrically connecting fixed scale 13 to a controller, to accurately deliver and meter the solid flocculant; through configuration flowmeter 15 to with flowmeter 15 and controller electricity connection, in order to accurate transport and measure water, before the in-service use, can set up the proportion of throwing in advance, thereby reach the purpose of accurate allotment flocculant concentration.

In implementation, the controller may preferably adopt a PLC, a single chip microcomputer, a PC, or the like.

Example 3

This example provides a lyocell fiber solvent recovery pretreatment system comprising a solvent delivery pipe 7, a coagulation device 8, and a flocculant deployment system as described in example 1 or example 2, wherein,

the coagulation device 8 is configured with a coagulation cavity 81 to provide a place for coagulation of the lean solvent and the flocculant, and as shown in fig. 4, the coagulation device 8 is further configured with a stirrer 51 to enable the lean solvent and the flocculant to be fully contacted and uniformly mixed, which is beneficial to realizing better coagulation effect and improving coagulation efficiency.

As shown in fig. 4, the solvent delivery pipe 7 communicates with the coagulation cavity 81 so as to deliver the recovered lean solvent into the coagulation cavity 81. Meanwhile, the first overflow port 32 is located at a position higher than the coagulation cavity 81, as shown in fig. 4, the first overflow port 32 is communicated with the coagulation cavity 81 through the overflow pipe 6, and the flocculant in the storage cavity 31 overflows into the coagulation cavity 81 through the first overflow port 32, so that the flocculant and the diluted solvent conveyed by the solvent conveying pipe 7 can be contacted and mixed in the coagulation cavity 81, and aggregation and coagulation can occur.

In order to accurately control the addition amount of the flocculant, as shown in fig. 4, the solvent delivery pipe 7 is provided with a first flow rate monitoring module 61 for monitoring the flow rate so as to monitor the amount of the lean solvent delivered by the solvent delivery pipe 7. Meanwhile, as shown in fig. 4, the overflow pipe 6 is provided with a third regulating valve 63 and a second flow rate monitoring module 62 for monitoring the flow rate; the first flow monitoring module 61, the second flow monitoring module 62 and the third regulating valve 63 are respectively and electrically connected with the controller, and the amount of the lean solvent conveyed in the solvent conveying pipe 7 can be accurately monitored and fed back to the controller by configuring the first flow monitoring module 61; by configuring the second flow monitoring module 62, the amount of flocculant added can be accurately monitored; by configuring the third regulating valve 63, the flow rate of the overflow pipeline 6 can be effectively regulated, so that a corresponding dosage of flocculant can be automatically added according to the amount of the dilute solvent, and a better flocculation effect can be realized; and the control process is simple, convenient and quick.

In practice, the first flow monitoring module 61 may preferably employ an electromagnetic flow meter, and correspondingly, the second flow monitoring module 62 may preferably employ an electromagnetic flow meter. Of course, in practice, the first flow monitoring module 61 and the second flow monitoring module 62 may also be other types of flow meters, which are not illustrated herein.

In a more sophisticated solution, as shown in fig. 4, one or more sedimentation tanks 9 connected in series with each other are further provided downstream of the coagulation device 8, and the coagulation device 8 is connected to the sedimentation tank 9 through a pipe, so that the sedimentation treatment is performed on the flocculated liquid by using the sedimentation tank 9, so as to effectively separate the flocculated mass in the liquid. By way of example, three sedimentation tanks 9 connected in series with each other are provided downstream of the coagulation device 8 in order to carry out a multistage sedimentation treatment of the lean solvent.

In practice, the coagulation device 8 may employ a coagulation vessel of an existing structure, such as a coagulation tank, a coagulation box, or the like. In the preferred embodiment provided in this embodiment, the bottom of the coagulation cavity 81 is configured as a conical structure, as shown in fig. 4, and the bottom of the coagulation cavity 81 is communicated with the sedimentation tank 9 through a pipeline, so that the flocculation generated by the reaction is conveniently discharged from the bottom of the coagulation cavity 81, and the problems of accumulation and blockage are avoided. Meanwhile, the pipeline is provided with a valve, the valve is preferably a ball valve 82, and in the actual use process, when workers find that the liquid amount in the downstream sedimentation tank 9 is large, the pipeline can be temporarily closed through the valve.

In a more sophisticated solution, in order to facilitate checking the liquid level in the coagulation cavity 81, the coagulation device 8 is further provided with a liquid level monitoring module 52, and in implementation, the liquid level monitoring module 52 may be an existing liquid level meter, as shown in fig. 4, and for example, the liquid level monitoring module 52 may also include a liquid level sensor, where the liquid level sensor is electrically connected to the controller, so as to collect the liquid level by using the liquid level sensor, and feed back the liquid level to the controller, so that the controller performs related control.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model.

Claims (10)

1. The flocculant allocation system comprises an allocation device, wherein the allocation device comprises an allocation cavity for allocating flocculant, and is characterized by further comprising a conveying pipeline, a return pipeline, an adjusting pump, an adjusting valve and a temporary storage device, wherein,

the temporary storage device comprises a storage cavity for storing flocculant and a first overflow port communicated with the storage cavity,

the inlet of the regulating pump is communicated with the blending cavity, the outlet of the regulating pump is respectively communicated with the conveying pipeline and the return pipeline, the conveying pipeline is communicated with the storage cavity, the return pipeline is communicated with the blending cavity,

the regulating valve is used for regulating the output quantity and the reflux quantity of the flocculant in the blending cavity.

2. The flocculant blending system of claim 1, wherein the regulating valve is a three-way regulating valve, the three-way regulating valve comprises an inlet and two outlets, the outlet of the regulating pump is communicated with the inlet of the three-way regulating valve, and the conveying pipeline and the return pipeline are respectively communicated with the two outlets of the three-way regulating valve;

or, the two regulating valves are respectively a first regulating valve and a second regulating valve, and the first regulating valve and the second regulating valve are respectively arranged on the conveying pipeline and the backflow pipeline.

3. The flocculant dispensing system of claim 1, wherein the temporary storage device further comprises a second overflow port in communication with the storage cavity, the second overflow port being higher than the first overflow port, the second overflow port in communication with the dispensing cavity through a conduit.

4. The flocculant dispensing system of claim 1, wherein the dispensing device is further provided with a stirrer;

and/or, the temporary storage device is also provided with a stirrer;

and/or the blending device is provided with a liquid level monitoring module;

and/or, the temporary storage device is provided with a liquid level monitoring module.

5. The flocculant dispensing system of any of claims 1-4, further comprising a delivery device for delivering a solid flocculant, a water line for delivering water, wherein,

the conveying device is communicated with the blending cavity, the conveying device is provided with a fixed weighing meter, the fixed weighing meter is electrically connected with the controller,

the water pipe is communicated with the allocation cavity, and is provided with a flowmeter which is electrically connected with the controller.

6. A solvent recovery pretreatment system for lyocell fibers is characterized by comprising a solvent conveying pipe, a coagulation device and the flocculant blending system as claimed in any one of claims 1 to 5, wherein,

the coagulation device is constructed with a coagulation cavity,

the solvent conveying pipe is communicated with the coagulation cavity, and the first overflow port is communicated with the coagulation cavity through an overflow pipeline.

7. The lyocell fiber solvent recovery pretreatment system according to claim 6, wherein the solvent delivery pipe is provided with a first flow rate monitoring module for monitoring a flow rate, the overflow pipe is provided with a third regulating valve and a second flow rate monitoring module for monitoring a flow rate,

the first flow monitoring module, the second flow monitoring module and the third regulating valve are respectively and electrically connected with the controller.

8. The lyocell fiber solvent recovery pretreatment system of claim 7, wherein the first flow monitoring module employs an electromagnetic flowmeter,

and/or, the second flow monitoring module adopts an electromagnetic flowmeter;

and/or the coagulation device is also provided with a stirrer;

and/or, the coagulation device is also provided with a liquid level monitoring module.

9. The pretreatment system for recycling lyocell fiber solvent according to claim 6, wherein one or more sedimentation tanks connected in series are further provided downstream of the coagulation device, and the coagulation device is connected with the sedimentation tanks through a pipe.

10. The lyocell fiber solvent recovery pretreatment system according to claim 9, wherein a bottom of the coagulation cavity is constructed in a tapered structure, the bottom of the coagulation cavity is communicated with the sedimentation tank through a pipe, and the pipe is provided with a valve.