CN111905659A - Method and device for extracting cleaning liquid from slurry bed - Google Patents
Method and device for extracting cleaning liquid from slurry bed Download PDFInfo
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Abstract
The invention discloses a device and a method for extracting clean liquid from a slurry bed in an environment-friendly and energy-saving way, which mainly comprise the following steps: s1, the slurry in the slurry bed is siphoned into a material collecting pipe and then sprayed into a settling tank, and solid particles settle in the settling tank and return to the slurry bed through a material discharging pipe; s2, the supernatant in the settling tank flows upwards along the settling pipe, and then flows downwards into the clear liquid pipe and flows into the clear liquid transition tank at the intersection of the pipes; s3, discharging liquid through an overflow mode by a clear liquid transition tank, and maintaining the liquid level constant and the pressure required by siphoning; and S4, gas in the sampling pipe enters the air escape pipe and is continuously discharged, so that the liquid level in the air escape pipe is always higher than the intersection of the pipes, the slurry bed and the clear liquid transition tank are always communicated, and the liquid level is kept flat. The device has the advantages of simple structure, simple and convenient process flow, safety, reliability, difficult failure, easy realization of large-scale continuous operation, easy adjustment of separation efficiency and precision, small equipment investment, low operation cost and environmental protection.
Description
Technical Field
The invention relates to the technical field of slurry beds, in particular to a method and a device for extracting clean liquid from a slurry bed.
Background
Compared with a fixed bed reactor, a slurry bed reactor can use solid particles with smaller particle size without worrying about the problem of over-high bed pressure drop. The use of small particles can obviously reduce the resistance of the internal diffusion step, strengthen the contact mass transfer between the flow and the solid phase and improve the macroscopic reaction rate. However, slurry bed reactors must face the problem of how to separate these small particles from the liquid phase product, i.e. how to extract clean liquid from the slurry bed. The liquid-solid separation is not only required to improve the purity of liquid-phase products, but also required to improve the utilization efficiency of solid catalyst particles. How to effectively realize large-scale, continuous and efficient separation of liquid and solid is a key technology in the design process of a slurry bed reactor.
At present, liquid-solid separation methods adopted by a slurry bed mainly comprise three main types:
the first type is a method based on filtration separation (including membrane separation), which has advantages in that the separation accuracy is high and the liquid phase product contains almost no solid particles. The disadvantages are however very significant and are particularly unsuitable for the case of solid catalysts having a high concentration and small particles, i.e. continuous operation is not easy to achieve and the separated solid particles often require additional power to return to the slurry bed. In addition, clogging is also a problem that the filtration separation method cannot avoid, and the industrial application thereof is limited to a large extent. As in the patent publication No. CN102049222B, although continuous liquid-solid separation is achieved by cross-flow filtration inside a slurry bed, the problem of clogging of the filter medium channels still needs to be faced.
The second type is a hydrocyclone-based separation process, as disclosed in patent publication CN 106635138B, where the slurry is first introduced into a hydrocyclone, the top stream is then withdrawn as a liquid product and the bottom stream is returned to the slurry bed as a solid phase. The method has the advantages of well realizing continuous operation (continuous extraction of clear liquid and continuous return of solid phase) and being not easy to have faults. But there are also three disadvantages: one is that the separation precision is not high, and the top flow liquid phase often contains a certain amount of small particles and often needs secondary separation; secondly, in order to increase the speed of the slurry entering the hydrocyclone (improve the separation efficiency and precision) or to make the underflow concentrated slurry smoothly return to the slurry bed, an expensive slurry pump is often needed to pump the slurry, so that the investment cost and the operation cost are increased; thirdly, the abrasion of particles in a slurry pump and a hydrocyclone is serious, the dosage of solid particles is increased, and meanwhile, the generated fine powder can further increase the difficulty of separation in the next period, so that vicious circle is caused.
The third category is separation methods based on gravity settling, which can have the advantage of both low particle attrition and ease of continuous operation compared to the first two categories. However, for the traditional gravity settling separation, the catalyst particles cannot be too small, the concentration is not too large, and the separation is not sufficient. In addition, the equipment investment is large because the higher separation efficiency and precision are often required to be obtained by sacrificing larger separation space. Furthermore, for the settling separation process to be carried out outside the slurry bed, additional power is still required to be able to return the solid particles back into the slurry bed. For the method of settling separation in the slurry bed (for example, the invention patent with the publication number of CN 102039106B), the liquid-solid continuous separation can be well realized, the solid particles are retained in the reactor, and the clear liquid is discharged in overflow. However, in the liquid-solid separation process in the slurry bed, the liquid-solid separation efficiency and accuracy are not high due to the small settling separation space and the short settling distance. In summary, for the traditional separation method based on gravity settling, the equipment investment, the separation efficiency and the separation precision are mutually contradictory and cannot be simultaneously obtained.
In summary, there is no green, environmentally friendly, energy-saving and simple apparatus or method that can achieve large-scale liquid continuous operation while maintaining high separation efficiency and accuracy. Therefore, how to propose a new solution for extracting clean liquid from slurry bed to overcome the above technical problems is a problem to be solved in the present invention.
Disclosure of Invention
The invention aims to provide a device and a method for extracting clean liquid from a slurry bed in an environment-friendly and energy-saving manner, which can realize continuous large-scale energy-saving separation of liquid and solid on the premise of ensuring higher separation efficiency and precision and continuously extract a large amount of clear liquid products.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a method for extracting clean liquid from a slurry bed, which comprises the following steps:
s1: sucking the slurry in the slurry bed into a material collecting pipe, and then injecting the slurry into a settling tank to enable solid particles to settle in the settling tank and return to the slurry bed through a material discharging pipe;
s2: supernatant in the settling tank flows upwards along the settling pipe and turns downwards to flow into the clear liquid pipe at the intersection of the pipelines;
s3: supernatant in the clear liquid pipe flows into a clear liquid transition tank, and the clear liquid transition tank discharges cleaning liquid in an overflow mode and is collected by a cleaning liquid storage tank;
s4: gas in the material collecting pipe enters the gas escape pipe at the pipeline intersection and is continuously discharged, so that the liquid level in the gas escape pipe is always higher than the pipeline intersection, the slurry bed and the clear liquid transition tank are always communicated, and the liquid level is kept level.
Optionally, in step S1, slurry in the slurry bed is sucked into the sampling pipe in a siphoning manner.
Optionally, in step S1, the slurry in the sampling pipe first rises vertically and then falls obliquely, the particles in the discharging pipe fall vertically, and the slurry in the sampling pipe and the slurry in the discharging pipe have a density difference due to different solid contents, so that a directional circulating flow is formed, and the settled solid particles can be quickly returned to the slurry bed.
Optionally, in step S4, it is necessary to maintain the slurry bed and the clear liquid transition tank in communication with each other, so that the liquid levels of the slurry bed and the clear liquid transition tank are even, and the slurry can be siphoned.
Optionally, in step S4, it is necessary to maintain the liquid level in the clear liquid transition tank constant, so as to maintain the power required for siphoning.
The invention provides a device for extracting the clean liquid from the slurry bed, which can realize the method for extracting the clean liquid from the slurry bed and mainly comprises an extracting pipe, a settling tank, a clear liquid transition tank, a clean liquid storage tank and an automatic liquid level control system; the bottom end of the material collecting pipe is inserted below the liquid level of the slurry bed, and the top end of the material collecting pipe is bent downwards and communicated with the lower part of the settling tank; the bottom end of the settling tank is connected with a discharging pipe, and the bottom end of the discharging pipe is inserted below the liquid level of the slurry bed; the top end of the settling tank is connected with a settling pipe, and the settling pipe is simultaneously connected with the clear liquid pipe and the air escape pipe to form a pipeline junction; the other end of the clear liquid pipe is inserted below the liquid level of the clear liquid transition tank, and the clear liquid transition tank is connected with the cleaning liquid storage tank through an overflow pipeline; the other end of the air escape pipe is connected with the automatic liquid level control system, and the automatic liquid level control system is used for detecting and regulating the liquid level in the air escape pipe; the collecting pipe is communicated with the settling pipe through a pipeline.
Optionally, the slurry bed is a liquid-solid two-phase slurry bed; and a charging valve is arranged at the top of the liquid-solid two-phase slurry bed, and a liquid distributor is arranged at the bottom of the liquid-solid two-phase slurry bed and is connected with a fresh liquid inlet pipeline.
Optionally, the slurry bed is a gas-liquid-solid three-phase slurry bed; the top of the gas-liquid-solid three-phase slurry bed is provided with a feed valve and a vent valve, and the bottom of the gas-liquid-solid three-phase slurry bed is provided with a gas distributor which is connected with a gas inlet pipeline; one side of the bottom of the gas-liquid-solid three-phase slurry bed is connected with a fresh liquid inlet pipeline.
Optionally, the inner wall of the gas-liquid-solid three-phase slurry bed is provided with a baffle, the baffle encloses the lower end of the material collecting pipe and immerses the lower end of the material collecting pipe below the liquid level, so that gas is prevented from entering the material collecting pipe, and a gap is formed in the bottom end of the baffle, so that partially settled solids can return to the reactor main body.
Optionally, the settling tube, the clear liquid tube and the air escape tube are connected through a tee structure.
Compared with the prior art, the invention has the following technical effects:
compared with the prior art, the new scheme for extracting the cleaning liquid from the slurry bed provided by the invention has the following advantages:
(1) the continuous operation is easy to realize, the cleaning liquid can be continuously discharged in a large scale, the separated solid particles can be continuously and automatically returned, and the problem that the solid particles are accumulated in a settling tank due to interaction does not exist;
(2) the slurry enters a liquid-solid separation system according to a siphon principle, so that solid-liquid separation and recycling can be realized without extra power, and the slurry has the characteristics of environmental protection and energy conservation;
(3) the problem of particle abrasion is basically avoided, fine powder is not generated, the separation is sufficient, and the efficiency is high;
(4) the equipment has compact structure, low investment cost and low operation cost;
(5) the process flow is simple, the operation is simple and convenient, the safety and the reliability are realized, and the fault is not easy to occur;
(6) the combination of inertial and gravitational forces creates a hypergravity that allows the particles to be more easily separated in the settling tank, allowing smaller particles to be separated and returned to the slurry bed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a system for extracting a cleaning liquid from a two-phase liquid-solid slurry bed according to the present invention;
FIG. 2 is a schematic diagram of a system for extracting clean liquid from a three-phase gas-liquid-solid slurry bed according to the present invention;
wherein the reference numerals are: fresh liquid enters the pipeline 1; a liquid distributor 2-1; a gas distributor 2-2; 3-1 of a liquid-solid two-phase slurry bed; 3-2 of a gas-liquid-solid three-phase slurry bed; a material collecting pipe 4; a blanking pipe 5; a settling tank 6; a three-way structure 7; a clear liquid pipe 8; a clear liquid transition tank 9; a cleaning liquid tank 10; an air escape pipe 11; a liquid level automatic control system 12; a liquid level detection and analysis system 13; an air pump 14; a feed valve 15; a settling tube 16; a purge valve 17; a gas inlet duct 18; a baffle plate 19; an overflow conduit 20; line 21.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The first embodiment is as follows:
as shown in fig. 1, the present embodiment provides a method for extracting a cleaning liquid from a slurry bed, which mainly comprises the following steps:
(1) the slurry in the slurry bed is siphoned into the material collecting pipe and then sprayed into the settling tank, solid particles are quickly settled and return to the slurry bed through the discharging pipe, and density difference is caused by different solid concentrations of the slurry in the material collecting pipe and the slurry in the discharging pipe, so that the slurry directional flow circulation is realized in the material collecting pipe and the discharging pipe, and the liquid-solid separation by using supergravity is facilitated, and the settled solid in the settling tank is also facilitated to quickly and automatically return to the slurry bed through the discharging pipe, so that the solid particles are prevented from being deposited on the upper part of the discharging pipe due to acting force among the particles and difficult to return of the solid catalyst due to slow settling caused by slurry rising in the discharging pipe.
(2) The supernatant in the settling tank flows upwards along the settling tube and is subjected to gravity settling for enough time, and then flows downwards into the clear liquid tube and flows into the clear liquid transition tank at the tee joint;
(3) the liquid overflowing from the clear liquid transition tank is the required cleaning liquid, and is collected by the cleaning liquid storage tank, and the liquid level in the clear liquid transition tank can be kept constant by discharging liquid in an overflow mode, so that the power required by siphoning is maintained;
(4) the gas entering the material collecting pipe or the gas escaping from the liquid moves upwards in the material collecting pipe in the form of small bubbles, turns upwards at the tee joint to enter the gas escaping pipe and is continuously discharged, so that the liquid level in the gas escaping pipe is always higher than the connection part of the tee joint, the slurry bed is always communicated with the clear liquid transition tank, and the liquid levels of the slurry bed and the clear liquid transition tank are kept level.
In this embodiment, the lower end of the material collecting pipe needs to be inserted below the liquid level in the slurry bed, the upper end of the material collecting pipe is connected with the settling tank, the upper end of the settling tank is connected with the upper end of the clear liquid pipe and the lower end of the gas escape pipe through a tee joint, and the lower end of the clear liquid pipe needs to be inserted below the liquid level in the clear liquid transition tank.
In this embodiment, the liquid level in the air escape pipe should be higher than the tee junction all the time to ensure that the slurry bed and the clear liquid transition tank are communicated all the time, and the liquid level is dynamically balanced, thereby creating conditions for the smooth siphon.
In this embodiment, the cleaning liquid in the clear liquid transition tank is discharged into the cleaning liquid storage tank through the overflow pipe, thereby maintaining the liquid level constant and the power required for siphoning.
In the embodiment, the upper end of the material collecting pipe is inclined downwards or faces the material discharging pipe, so that the slurry is sprayed downwards to enter the lower part of the settling tank, solid and liquid are subjected to liquid-solid supergravity separation under the dual action of inertia force and gravity due to large inertia difference, and concentrated slurry forms fixed directional circulating flow between the material collecting pipe and the material discharging pipe, so that solid particles can be separated and then quickly return to a slurry bed.
In this embodiment, the cone angle of the inverted cone section in the settling tank should be set reasonably to prevent the particles from accumulating and falling freely.
In this embodiment, the separation accuracy can be changed by adjusting the size of the settling tube.
The following will specifically describe the extraction method and the corresponding extraction apparatus of this embodiment, taking the extraction of the cleaning liquid from the slurry bed of liquid-solid two phases as an example.
As shown in fig. 1, in the liquid-solid two-phase slurry bed 3-1, the lower end of the material collecting pipe 4 is inserted below the liquid level in the liquid-solid two-phase slurry bed 3-1, the upper end is bent downwards and communicated with the lower part of the settling tank 6, the lower end of the settling tank 6 is connected with the upper end of the material discharging pipe 5, and the lower end of the material discharging pipe 5 is also inserted below the liquid level in the liquid-solid two-phase slurry bed 3-1. The upper end of the settling tank 6 is connected with the upper ends of the three-way structure 7 and the clear liquid pipe 8 and the lower end of the air escape pipe 11 through a settling pipe 16 to form a pipeline junction. The lower end of the clear liquid pipe 8 is inserted below the liquid level of the clear liquid transition tank 9, the clear liquid transition tank 9 is connected with the cleaning liquid storage tank 10 through an overflow pipeline 20, and the liquid in the clear liquid transition tank 9 can flow into the cleaning liquid storage tank 10 in an overflow mode. The upper end of the air escape pipe 11 is connected with an automatic liquid level control system 12, and the liquid level control system 12 mainly comprises a liquid level detection and analysis system 13 and an air suction pump 14; meanwhile, the upper part of the material collecting pipe 4 is also provided with a pipeline 21 communicated with the settling pipe 16.
Firstly, solid particles are added into a liquid-solid two-phase slurry bed 3-1 through a charging valve 15, then a clear liquid transition tank 9 is filled with clean liquid to the position of an overflow port, then fresh liquid enters the liquid-solid two-phase slurry bed 3-1 through a pipeline 1 and a liquid distributor 2-1, after the liquid level reaches a target value, a liquid level automatic control system 12 is started, and the liquid level in an air escape pipe 11 reaches the target range through the air suction effect of an air suction pump 14. At this time, the liquid is fully filled in the collecting pipe 4, the settling tank 6, the blanking pipe 5, the settling pipe 16, the clear liquid pipe 8 and the pipeline 21, so that the liquid-solid two-phase slurry bed 3-1 and the clear liquid transition tank 9 are in a communicated state, and the liquid levels of the two are kept level. Then, in the process that the fresh liquid enters the liquid-solid two-phase slurry bed 3-1, the slurry in the liquid-solid two-phase slurry bed 3-1 can be siphoned into the material collecting pipe 4 and then is sprayed into the settling tank 6, and solid particles are rapidly settled and return to the liquid-solid two-phase slurry bed 3-1 through the material discharging pipe 5. The supernatant in the settling tank 6 continues to flow up the settling tube and further gravitationally settle and turns at the tee structure 7 down into a supernatant pipe 8 and finally into a supernatant transition tank 9. The clear liquid transition tank 9 maintains the liquid level constant and the power required for siphoning by overflowing, and the overflowing liquid flows into the clean liquid storage tank 10.
Gas entering the production pipe 4 or escaping from the liquid will move up the pipeline 21 and the settling pipe 16 in the form of small bubbles and turn into the gas escape pipe 11 at the tee structure 7, causing the liquid level in the gas escape pipe 11 to drop gradually. If the gas cannot be discharged in time, the liquid level in the gas escape pipe 11 will continuously drop, and finally the connection between the collecting pipe 4 and the clear liquid pipe 8 will be lost, the connection between the liquid-solid two-phase slurry bed 3-1 and the clear liquid transition tank 9 will not be lost, the liquid levels of the two will not be leveled, and the slurry in the liquid-solid two-phase slurry bed 3-1 can not be siphoned into the collecting pipe 4. Therefore, the automatic liquid level control system 12 is provided, and when the liquid level detection and analysis system 13 detects that the liquid level in the air escape pipe 11 decreases to the lower limit value, the automatic liquid level control system will send a command to turn on the air pump 14, so that the liquid level in the air escape pipe 11 gradually increases, and when the liquid level detection and analysis system 13 detects that the liquid level in the air escape pipe 11 reaches to the upper limit value, the automatic liquid level control system will send a command to turn off the air pump 14. In this way, the liquid level in the air escape pipe 11 can fluctuate between the upper limit value and the lower limit value, so that the liquid-solid two-phase slurry bed 3-1 and the clear liquid transition tank 9 are always communicated with each other, and the liquid levels of the two are always kept equal. Meanwhile, solid particles are always trapped in the liquid-solid two-phase slurry bed 3-1, so that the utilization efficiency of the solid particles can be obviously improved.
It should be noted that the liquid level detection and analysis system 13 and the air pump 14 are electrically connected, and both are existing structural components, for example, the liquid level detection and analysis system 13 may be formed by signal connection of an existing liquid level detector and a micro control system; the specific structures and working principles of the two are the prior art, so as to implement the functions of the scheme of the present embodiment, which is not described herein again.
Example two:
as shown in fig. 2, the present embodiment provides a method for extracting a cleaning liquid from a slurry bed, which mainly comprises the following steps:
(1) the slurry in the slurry bed is siphoned into the material collecting pipe and then sprayed into the settling tank, solid particles are quickly settled and return to the slurry bed through the discharging pipe, and density difference is caused by different solid concentrations of the slurry in the material collecting pipe and the slurry in the discharging pipe, so that the slurry directional flow circulation is realized in the material collecting pipe and the discharging pipe, and the liquid-solid separation by using supergravity is facilitated, and the settled solid in the settling tank is also facilitated to quickly and automatically return to the slurry bed through the discharging pipe, so that the solid particles are prevented from being deposited on the upper part of the discharging pipe due to acting force among the particles and difficult to return of the solid catalyst due to slow settling caused by slurry rising in the discharging pipe.
(2) The supernatant in the settling tank flows upwards along the settling tube and is subjected to gravity settling for enough time, and then flows downwards into the clear liquid tube and flows into the clear liquid transition tank at the tee joint;
(3) the liquid overflowing from the clear liquid transition tank is the required cleaning liquid, and is collected by the cleaning liquid storage tank, and the liquid level in the clear liquid transition tank can be kept constant by discharging liquid in an overflow mode, so that the power required by siphoning is maintained;
(4) the gas entering the material collecting pipe or the gas escaping from the liquid moves upwards in the material collecting pipe in the form of small bubbles, turns upwards at the tee joint to enter the gas escaping pipe and is continuously discharged, so that the liquid level in the gas escaping pipe is always higher than the connection part of the tee joint, the slurry bed is always communicated with the clear liquid transition tank, and the liquid levels of the slurry bed and the clear liquid transition tank are kept level.
In this embodiment, the lower end of the material collecting pipe needs to be inserted below the liquid level in the slurry bed, the upper end of the material collecting pipe is connected with the settling tank, the upper end of the settling tank is connected with the upper end of the clear liquid pipe and the lower end of the gas escape pipe through a tee joint, and the lower end of the clear liquid pipe needs to be inserted below the liquid level in the clear liquid transition tank.
In this embodiment, the liquid level in the air escape pipe should be higher than the tee junction all the time to ensure that the slurry bed and the clear liquid transition tank are communicated all the time, and the liquid level is dynamically balanced, thereby creating conditions for the smooth siphon.
In this embodiment, the cleaning liquid in the clear liquid transition tank is discharged into the cleaning liquid storage tank through the overflow pipe, thereby maintaining the liquid level constant and the power required for siphoning.
In the embodiment, the upper end of the material collecting pipe is inclined downwards or faces the material discharging pipe, so that the slurry is sprayed downwards to enter the lower part of the settling tank, solid and liquid are subjected to liquid-solid supergravity separation under the dual action of inertia force and gravity due to large inertia difference, and concentrated slurry forms fixed directional circulating flow between the material collecting pipe and the material discharging pipe, so that solid particles can be separated and then quickly return to a slurry bed.
In this embodiment, the cone angle of the inverted cone section in the settling tank should be set reasonably to prevent the particles from accumulating and falling freely.
In this embodiment, the separation accuracy can be changed by adjusting the size of the settling tube.
The following will specifically describe the extraction method and the corresponding extraction apparatus of this embodiment, taking the extraction of clean liquid from a slurry bed of three phases of gas, liquid and solid as an example.
As shown in figure 2, in a gas-liquid-solid three-phase slurry bed 3-2, the lower end of a material collecting pipe 4 is inserted below the liquid level in the gas-liquid-solid three-phase slurry bed 3-2, the upper end of the material collecting pipe is bent downwards and is opposite to a material discharging pipe 5 and communicated with a settling tank 6, the lower end of the settling tank 6 is connected with the upper end of the material discharging pipe 5, and the lower end of the material discharging pipe 5 is also inserted below the liquid level in the gas-liquid-solid three-phase slurry bed 3-2. The upper end of the settling tank 6 is connected with the upper ends of the three-way structure 7 and the clear liquid pipe 8 and the lower end of the air escape pipe 11 through a settling pipe 16. The lower end of the clear liquid pipe 8 is inserted below the liquid level of the clear liquid transition tank 9, and the liquid in the clear liquid transition tank 9 can flow into the cleaning liquid storage tank 10 in an overflowing manner through an overflow pipe 20. The upper end of the air escape pipe 11 is connected with an automatic liquid level control system 12, and an automatic liquid level control system 14 consists of a liquid level detection and analysis system 13 and an air suction pump 14; meanwhile, the upper part of the material collecting pipe 4 is also provided with a pipeline 21 communicated with the settling pipe 16.
Firstly, solid particles are added into a gas-liquid-solid three-phase slurry bed 3-2 through a charging valve 15, then a clear liquid transition tank 9 is filled with clean liquid to the position of an overflow port, then the gas enters a gas-liquid-solid three-phase slurry bed 3-2 through a gas inlet pipeline 18 and a gas distributor 2-2, meanwhile, the fresh liquid enters the gas-liquid-solid three-phase slurry bed 3-2 through a pipeline 1, after the liquid level in the gas-liquid-solid three-phase slurry bed 3-2 reaches a target value, the liquid level automatic control system 12 is started, the liquid level in the air escape pipe 11 reaches the target range through the air pumping action of the air pump 14, at the moment, the sampling pipe 4, the settling tank 6, the blanking pipe 5, the settling pipe 16, the clear liquid pipe 8 and the pipeline 21 are all filled with liquid, further leading the gas-liquid-solid three-phase slurry bed 3-2 and the clear liquid transition tank 9 to be in a communicated state, and keeping the liquid levels of the two in a level state. And then, in the process of pumping gas and fresh liquid into the gas-liquid-solid three-phase slurry bed 3-2, tail gas is discharged through a vent valve 17, slurry in the gas-liquid-solid three-phase slurry bed 3-2 is siphoned into a material collecting pipe 4 and sprayed into a settling tank 6, and solid particles are rapidly settled under the supergravity effect formed by inertia force and gravity and return to the gas-liquid-solid three-phase slurry bed 3-2. The supernatant in the settling tank continues to move upwards and further gravitationally settle and, at the tee structure 7, turns to flow downwards into a clear liquid pipe 8 and finally into a clear liquid transition tank 9. The clear liquid transition tank 9 maintains the liquid level to be constant and the power required by siphoning in an overflow mode, and the overflowed liquid enters the cleaning liquid storage tank 10.
Gas entering the production pipe 4 or escaping from the liquid will move up the pipeline 21 and the settling pipe 16 in the form of small bubbles and turn into the gas escape pipe 11 at the tee structure 7, causing the liquid level in the gas escape pipe 11 to drop gradually. If the gas cannot be discharged in time, the liquid level in the gas escape pipe 11 will continuously drop, and finally the gas extraction pipe 4 and the clear liquid pipe 8 will not be communicated, and the slurry in the gas-liquid-solid three-phase slurry bed 3-2 cannot be siphoned into the gas extraction pipe 4. Therefore, the automatic liquid level control system 12 is provided, and when the liquid level detection and analysis system 13 detects that the liquid level in the air escape pipe 11 decreases to the lower limit value, the automatic liquid level control system will send a command to turn on the air pump 14, so that the liquid level in the air escape pipe 11 gradually increases, and when the liquid level detection and analysis system 13 detects that the liquid level in the air escape pipe 11 reaches to the upper limit value, the automatic liquid level control system will send a command to turn off the air pump 14. In this way, the liquid level in the gas escape pipe 11 can fluctuate between the upper limit value and the lower limit value, and the gas-liquid-solid three-phase slurry bed 3-2 and the clear liquid transition tank 9 are always communicated with each other. Meanwhile, solid particles are always trapped in the gas-liquid-solid three-phase slurry bed 3-2, so that the utilization efficiency of the solid particles can be obviously improved. The separation accuracy can be effectively changed by adjusting the size of the settling tube 16.
In addition, in order to reduce the gas entering the sampling pipe 4 as much as possible, the following measures may be taken. The baffle 19 is used for enclosing the lower end of the material collecting pipe 4, the upper end of the baffle 19 is immersed below the liquid level of the gas-liquid-solid three-phase slurry bed 3-2, bubbles can be prevented from entering an enclosed area from the lower part or the horizontal direction by the baffle 19, a gap with a certain area is formed in the lower end of the baffle 19, and the settled solid catalyst in the enclosed area can automatically return to the area below the baffle to continuously participate in chemical reaction. The bubbles sucked into the enclosed area from the upper part of the baffle plate are converged and accumulated, and finally escape from the enclosed area without reaching the lower end area of the sampling pipe 4, so that the gas entering the sampling pipe 4 is obviously reduced, the load of the automatic liquid level control system 12 can be reduced, and the separation efficiency and the separation precision are improved.
In addition, the liquid level detection and analysis system 13 and the air pump 14 are electrically connected, and both are the existing structural components, for example, the liquid level detection and analysis system 13 can be formed by signal connection of an existing liquid level detection meter and a micro control system; the specific structures and working principles of the two are the prior art, so as to implement the functions of the scheme of the present embodiment, which is not described herein again.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A method for extracting slurry bed cleaning liquid is characterized in that: the method comprises the following steps:
s1: sucking the slurry in the slurry bed into a material collecting pipe, and then injecting the slurry into a settling tank to enable solid particles to settle in the settling tank and return to the slurry bed through a material discharging pipe;
s2: supernatant in the settling tank flows upwards along the settling pipe and turns downwards to flow into the clear liquid pipe at the intersection of the pipelines;
s3: supernatant in the clear liquid pipe flows into a clear liquid transition tank, and the clear liquid transition tank discharges cleaning liquid in an overflow mode and is collected by a cleaning liquid storage tank;
s4: gas in the material collecting pipe enters the gas escape pipe at the pipeline intersection and is continuously discharged, so that the liquid level in the gas escape pipe is always higher than the pipeline intersection, the slurry bed and the clear liquid transition tank are always communicated, and the liquid level is kept level.
2. A method of extracting a slurry bed cleaning liquid according to claim 1, characterized in that: in step S1, slurry in the slurry bed is siphoned into the production pipe.
3. A method of extracting a slurry bed cleaning liquid according to claim 1, characterized in that: in step S1, the slurry in the sampling pipe first rises vertically and then falls in an inclined manner, the particles in the discharging pipe fall vertically, and the slurry in the sampling pipe and the slurry in the discharging pipe have a density difference due to different solid contents, so that a directional circulating flow is formed, and the settled solid particles can be quickly returned to the slurry bed.
4. A method of extracting a slurry bed cleaning liquid according to claim 2, characterized in that: in step S4, it is necessary to maintain the slurry bed and the clear liquid transition tank to be always communicated, so that the liquid levels of the slurry bed and the clear liquid transition tank are kept equal, and the slurry can be siphoned.
5. A method of extracting a slurry bed cleaning liquid according to claim 2, characterized in that: in step S4, the liquid level in the clear liquid transition tank needs to be maintained constant, so as to maintain the power required by siphoning.
6. A device for extracting a slurry bed cleaning liquid, which can realize the method for extracting a slurry bed cleaning liquid according to any one of claims 1 to 5, and is characterized in that: comprises a material collecting pipe, a settling tank, a clear liquid transition tank, a cleaning liquid storage tank and a liquid level automatic control system; the bottom end of the material collecting pipe is inserted below the liquid level of the slurry bed, and the top end of the material collecting pipe is bent downwards and communicated with the lower part of the settling tank; the bottom end of the settling tank is connected with a discharging pipe, and the bottom end of the discharging pipe is inserted below the liquid level of the slurry bed; the top end of the settling tank is connected with a settling pipe, and the settling pipe is simultaneously connected with the clear liquid pipe and the air escape pipe to form a pipeline junction; the other end of the clear liquid pipe is inserted below the liquid level of the clear liquid transition tank, and the clear liquid transition tank is connected with the cleaning liquid storage tank through an overflow pipeline; the other end of the air escape pipe is connected with the automatic liquid level control system, and the automatic liquid level control system is used for detecting and regulating the liquid level in the air escape pipe; the collecting pipe is communicated with the settling pipe through a pipeline.
7. A withdrawal apparatus for a slurry bed cleaning liquid as claimed in claim 6, wherein: the slurry bed is a liquid-solid two-phase slurry bed; and a charging valve is arranged at the top of the liquid-solid two-phase slurry bed, and a liquid distributor is arranged at the bottom of the liquid-solid two-phase slurry bed and is connected with a fresh liquid inlet pipeline.
8. A withdrawal apparatus for a slurry bed cleaning liquid as claimed in claim 6, wherein: the slurry bed is a gas-liquid-solid three-phase slurry bed; the top of the gas-liquid-solid three-phase slurry bed is provided with a feed valve and a vent valve, and the bottom of the gas-liquid-solid three-phase slurry bed is provided with a gas distributor which is connected with a gas inlet pipeline; one side of the bottom of the gas-liquid-solid three-phase slurry bed is connected with a fresh liquid inlet pipeline.
9. A slurry bed cleaning liquid withdrawal apparatus as claimed in claim 8 wherein: the inner wall of the gas-liquid-solid three-phase slurry bed is provided with a baffle, the baffle encloses the lower end of the material collecting pipe and is immersed below the liquid level, and a gap is formed in the bottom end of the baffle.
10. A withdrawal apparatus for a slurry bed cleaning liquid as claimed in claim 6, wherein: the settling tube, the clear liquid tube and the air escape tube are connected through a tee structure.
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| CN111905659B (en) | 2022-04-19 |
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