CN219015745U - Slurry online sampling system - Google Patents

Abstract

The utility model belongs to the technical field of phosphorus chemical material sampling, and particularly relates to an online slurry sampling system which comprises a lifting driving device, a liquid-solid separation device, a gas-liquid separation device, a quantitative sample separation storage device, a back-flushing backwashing device and a vacuum device, wherein the liquid-solid separation device, the gas-liquid separation device and the quantitative sample separation storage device are sequentially communicated; the air outlet of the gas-liquid separation device is communicated with the vacuum device, and the air inlet of the gas-liquid separation device is communicated with the back-blowing backwashing device; the liquid-solid separation device is used for separating solid phase matters from liquid phase matters in the slurry; the gas-liquid separation device is used for separating the gas-liquid mixture pumped out of the liquid-solid separation device, and the liquid phase part is sent to the quantitative sample separating and storing device for sub-packaging and storage. The utility model can separate solid phase matters, gas and sample liquid more thoroughly; can be used for quick back blowing and cleaning, and is applicable to sampling thick slurry with strong corrosion, high solid content and high working temperature.

Description

Slurry online sampling system

Technical Field

The utility model belongs to the technical field of phosphorus chemical material sampling, and particularly relates to an online slurry sampling system.

Background

The industrial wet-process phosphoric acid extraction reaction tank is core equipment of a '836' high-concentration large-scale phosphorus compound fertilizer production device (80 ten thousand tons/year sulfuric acid, 30 ten thousand tons/year phosphoric acid and 60 ten thousand tons/year high-concentration monoaminophosphate DAP), and whether important process indexes such as running state, crystallization effect, sulfuric acid consumption, phosphorite slurry consumption and the like are normal or not is determined by controlling sulfate radical (SO 42-) in slurry in the extraction reaction tank. It is required to strictly control within a narrow range of 10 to 40mg/mL (calculated as SO 3). The process control of the phosphoric acid extraction reaction tank is very critical due to the influence of the added amount of sulfuric acid, phosphoric acid pulp, return acid and other quality variation factors of the phosphorite. It is important to rapidly and accurately analyze and detect the sulfate radical (SO 42-) content in the slurry in the extraction reaction tank.

At present, the analysis and measurement of the sulfate radical (SO 42-) content in slurry in an extraction reaction tank of a high-concentration large-scale phosphorus compound fertilizer production device at home and abroad generally adopts a manual sampling and manual analysis method to provide a measurement result. The analysis and measurement period is 1-4 hours, and various defects such as long analysis and measurement period, unstable analysis result, time and labor waste, operation safety risk and the like generally exist, so that stable operation of process production, raw material consumption control and energy consumption control are severely restricted. Moreover, when the current sampling device faces strong corrosion high-temperature thick slurry, rapid sampling and cleaning cannot be realized, the sampling device is easy to corrode and block, the next sampling is affected, and the sampling efficiency is low.

Disclosure of Invention

Aiming at the technical problems in the background technology, the utility model provides an online slurry sampling system.

In order to achieve the above purpose, the technical scheme provided by the utility model is as follows:

the slurry online sampling system comprises a lifting driving device, a liquid-solid separation device, a gas-liquid separation device, a quantitative sample separating storage device, a back flushing backwashing device and a vacuum device, wherein the liquid-solid separation device, the gas-liquid separation device and the quantitative sample separating storage device are sequentially communicated; the air outlet of the gas-liquid separation device is communicated with the vacuum device, and the air inlet of the gas-liquid separation device is communicated with the back-blowing backwashing device; the lifting driving device is used for controlling the lifting movement of the liquid-solid separation device; the liquid-solid separation device is used for separating solid phase matters from liquid phase matters in the slurry; the gas-liquid separation device is used for separating the gas-liquid mixture pumped out of the liquid-solid separation device, the gas phase part is discharged through the vacuum device, and the liquid phase part is sent to the quantitative sample separating storage device for sub-packaging storage; the back-flushing backwashing device is used for back-flushing backwashing the gas-liquid separation device, the liquid-solid separation device and the quantitative sample separating storage device.

Preferably, the liquid-solid separation device comprises a lower end socket, an upper end socket, a connecting pipe, a vacuum suction pipe, a back-blowing backwash pipe and a cylindrical filter element, wherein the upper end socket and the lower end socket are respectively connected with the upper end and the lower end socket of the filter element, the upper end of the upper end socket is connected with the connecting pipe, and the connecting pipe is connected with the lifting driving device; one end of the back-blowing backwash pipe extends into the filter element, and the other end of the back-blowing backwash pipe is connected with the gas-liquid separation device; one end of the vacuum suction pipe extends into the filter element, and the other end of the vacuum suction pipe is connected with the gas-liquid separation device.

Preferably, the filter element is made of a PP filter membrane or a polypropylene filter cloth.

Preferably, the filter element is a stainless steel or high-temperature ceramic yarn cylinder.

Preferably, the lifting driving device is an air cylinder lifting mechanism.

Preferably, the quantitative sample separating and storing device comprises a rotatable turntable and a plurality of material bottles arranged on the turntable, and a discharge port of the gas-liquid separating device is communicated with the material bottles through a pipeline.

Preferably, the back-blowing backwashing device is connected with an air inlet pipe and an water inlet pipe.

The utility model has the following advantages and beneficial effects:

1. the utility model provides an online sampling system for slurry, which is characterized in that a liquid-solid separation device, a gas-liquid separation device and a quantitative sample separating and storing device are sequentially communicated, solid matters and liquid matters in the slurry are separated by the liquid-solid separation device firstly in a vacuum suction mode, then the gas-liquid separation device separates a gas-liquid mixture sucked out of the liquid-solid separation device, a gas phase part is discharged by a vacuum device, and a liquid phase part is sent to the quantitative sample separating and storing device for sub-packaging and storage. By means of the design, solid matters, gas and sample liquid can be separated step by step, so that the sample liquid is separated more thoroughly, and the accuracy of subsequent detection is guaranteed.

2. The back blowing system provided by the utility model is directly connected with the gas-liquid separation device. After the sampling is completed, compressed air is introduced into the gas-liquid separation device, the gas-liquid separation device and the liquid-solid separation device are purged for the first time in sequence, solid matters on the liquid-solid separation device (filter element) are back-purged, residues in passages such as a gas-water mixed liquid backwash pipeline are used, and finally the compressed air is used for back-purging the gas-liquid separation device, the liquid-solid separation device and the quantitative sample separation storage device, so that clean conditions are provided for the next sampling. By the design, all systems can be quickly back-blown and cleaned after sampling is completed, so that the whole sampling system is guaranteed to be clean and dredged, a new thought and a new method are provided for solving the practical problems of liquid-solid separation, gas-liquid separation, corrosion and blockage types, and the device is suitable for online automatic sampling and filtering of thick slurry working conditions with strong corrosion, high solid content and high working temperature.

Drawings

FIG. 1 is a flow chart of a sampling system provided by the present utility model;

FIG. 2 is a schematic diagram of a liquid-solid separation device according to the present utility model;

FIG. 3 is a schematic diagram of a sampling process of the sampling device according to the present utility model;

FIG. 4 is a block diagram of a quantitative sample storage device according to the present utility model;

icon: the device comprises a 1-lifting driving device, a 11-support, a 12-cylinder, a 2-liquid-solid separation device, a 21-connecting pipe, a 22-upper seal head, a 23-upper seal ring, a 24-filter element, a 25-lower seal ring, a 26-lower seal head, a 27-back flushing backwash pipe, a 28-vacuum suction pipe, a 29-guide pipe, a 3-gas-liquid separation device, a 4-quantitative sample separation storage device, a 41-motor, a 42-turntable, a 43-material bottle, a 44-control valve, a 5-back flushing backwash device, a 6-vacuum device and a 7-PLC control system.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model.

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 those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Examples

As shown in fig. 1, the slurry on-line sampling system comprises a lifting driving device 1, a liquid-solid separation device 2, a gas-liquid separation device 3, a quantitative sample separating and storing device 4, a back-flushing backwashing device 5, a vacuum device 6 and a PLC control system 7.

The PLC control system 7 is respectively and electrically connected with the lifting driving device 1, the vacuum device 6 and the quantitative sample separating and storing device 4 and is used for controlling the corresponding devices to perform corresponding actions. The PLC control system 7 is a control center of the on-line automatic sampling and filtering device, and comprises PLC system hardware (comprising a PLC controller, a memory, a touch screen, an IO/DO card, a UPS power supply, a control cabinet and the like) and related operation software.

The lifting driving device 1 is arranged right above the liquid-solid separation device 2 and is connected with the liquid-solid separation device 2 for driving the liquid-solid separation device 2 to move up and down.

As shown in fig. 1, a liquid-solid separation device 2, a gas-liquid separation device 3 and a quantitative sample separating and storing device 4 are communicated through pipelines in sequence; the air outlet of the gas-liquid separation device 3 is communicated with the vacuum device 6, and the vacuum device 6 sucks the air to the outside for sucking and filtering. The vacuum system provides vacuum conditions for filtering solid matters by the liquid-solid separation device 2 and filtering gas sample liquid by the gas-liquid separation device 3. In the sampling process, the suction vacuum degree is generally controlled to be-0.04 to-0.06 MPa, and the vacuum pump mainly comprises a vacuum pump, a connecting pipeline, an electromagnetic valve and the like.

The air inlet of the gas-liquid separation device 3 is communicated with the back-blowing backwashing device 5, the back-blowing backwashing device 5 is connected with an air inlet pipe and an air inlet pipe, compressed air is introduced into one path, and water is introduced into the other path. The back-flushing backwashing device 5 carries out back-flushing backwashing on the liquid-solid separation device 2, the gas-liquid separation device 3 and the quantitative sample separating storage device 4 according to a program. The working procedure is that firstly, the solid phase matters (filter cakes) on the liquid-solid separation device 2 are reversely blown off by compressed air, then the air-water mixed liquid is used for backwashing the pipeline and filtering the residues in the channel, and finally, the compressed air is used for reversely blowing out the residues to provide clean conditions for the next sampling. The pressure of the back-blowing compressed air and the back-flushing water needs to be verified according to the specific conditions of the characteristics of the sampling medium, the structure of the liquid-solid separation device 2, the material of the filter element 24 and the like, and is generally controlled to be between-0.05 MPa and-0.30 MPa. The back blown solid phase (filter cake) and the back washing water are firstly returned to the production system, and feasible precautions (solid phase collecting device) are adopted to avoid polluting the working environment.

The liquid-solid separation device 2 is used for separating solid phase matters from liquid phase matters in the slurry; the gas-liquid separation device 3 is used for separating the gas-liquid mixture pumped out from the liquid-solid separation device 2, the gas phase part is discharged through the vacuum device 6, and the liquid phase part is sent to the quantitative sample separating storage device 4 for sub-packaging and storage; the back-flushing backwashing device 5 is used for back-flushing and backwashing the gas-liquid separation device 3, the liquid-solid separation device 2 and the quantitative sample separating and storing device 4.

Under the action of vacuum power, negative pressure suction is generated inside the gas-liquid separation device 3 and the liquid-solid separation device 2, the liquid-solid separation device 2 finally separates solid matters and liquid matters in the slurry, the gas-liquid mixture sucked out of the liquid-solid separation device 2 is separated through a gas-liquid separation system, a gas phase part is sucked out of the system through the vacuum device 6, and the liquid phase part is sent to the quantitative sample separating storage device 4 for sub-packaging storage.

As shown in fig. 2, the liquid-solid separation device 2 further comprises a lower end enclosure 26, an upper end enclosure 22, a connecting pipe 21, a vacuum suction pipe 28, a back flushing backwash pipe 27 and a cylindrical filter element 24, wherein the upper end and the lower end of the filter element 24 are respectively connected with the upper end enclosure 22 and the lower end enclosure 26, the upper end of the filter element 24 is sealed with the upper end enclosure 22 through an upper sealing ring 23, and the lower end of the filter element 24 is sealed with the lower end enclosure 26 through a lower sealing ring 25. The upper end of the upper seal head 22 is connected with a connecting pipe 21, and the connecting pipe 21 is connected with the lifting driving device 1; one end of the back-flushing backwash tube 27 extends into the filter element 24, and the other end is connected with the gas-liquid separation device 3; one end of the vacuum suction pipe 28 extends into the filter element 24, and the other end is connected with the gas-liquid separation device 3. The filtering precision of the filter element 24 can be selected according to the actual working condition, and one filter element 24 in the range of 10-120 mu m is selected according to the actual requirement, so that the automatic sampling and filtering of liquid phases in various solid-containing suspension slurries and sewage can be realized.

When the vacuum device 6 is started, the vacuum suction pipe 28 generates suction force to suck slurry into the inner cavity of the filter element 24, the solid matters of large particles are blocked by the filter element 24, then the slurry entering the inner cavity of the filter element 24 reaches the gas-liquid separation device 3 through the vacuum suction pipe 28, the vacuum system is continuously started after reaching the gas-liquid separation device 3, the gas is sucked and discharged, and the slurry is discharged to the quantitative sample separating storage device 4 for storage through a pipeline. After the sampling is completed, the back-flushing backwashing device 5 is started, and the purging is performed reversely.

As one preferable mode, the filter element 24 is made of PP filter membrane or polypropylene filter cloth.

As another preferred option, the filter element 24 is a stainless steel or high temperature ceramic bobbin.

The conditions that the structure and the material of the liquid-solid separation system should meet are as follows: the filter has proper filter precision, is convenient to install, maintain and replace, is corrosion-resistant and wear-resistant; the material is not deformed and falls off under the high-temperature working condition, and has enough mechanical strength; the back flushing and backwashing are convenient, and the back flushing and backwashing can be repeatedly used. Aiming at the high solid content and strong corrosion phosphoric acid slurry medium in the high-concentration wet phosphoric acid extraction reaction tank, the selection of the high-temperature ceramic filter material is recommended to be suitable.

Further, the lifting driving device 1 is an air cylinder lifting mechanism, and comprises a bracket 11 fixed on the top surface of the storage tank, an air cylinder 12 is fixed on the inner side of the bracket, and the telescopic end of the air cylinder 12 is connected with a connecting pipe 21; the top surface of the storage tank is also provided with a guide pipe 29 for guiding and positioning the solid-liquid separation device 2 and the connecting pipe 21. The lifting driving device 1 is used for inserting a liquid-solid separation system into the slurry liquid surface to suck liquid sample liquid; and pumping the liquid sample liquid, and then taking out the liquid level of the liquid-solid separation device 2 to perform back flushing and backwashing. The back flushing and backwashing are completed, and the liquid-solid separation device 2 is lifted out of the storage tank and is parked. The core equipment of the lifting drive 1 is a lifting mechanism providing pushing force and travel. The type of the lifting mechanism is quite large, and the lifting mechanism needs to be reasonably selected according to the depth (moving stroke) of the liquid-solid separation device 2 inserted into the storage tank and the actual situation on site. The device can be selected from a rod cylinder, a mechanical rodless cylinder, a magnetic coupling rodless cylinder, a multi-rotation driving mechanism, a controllable electric hoist and the like. The cylinder with the rod is suitable for the working condition that the moving stroke is less than 1.5 meters. The mechanical rodless cylinder and the magnetic coupling rodless cylinder are more suitable for the working condition that the moving stroke is less than 5 meters.

As shown in fig. 4, further, the quantitative sample separating and storing device 4 comprises a rotatable turntable 42 and a plurality of material bottles 43 arranged on the turntable 42, the turntable 42 is driven by a driving motor 41, a discharge port of the gas-liquid separating device 3 is communicated with the material bottles 43 through a pipeline, and a control valve 44 is arranged on the pipeline. The design is designed for temporarily storing the acquired liquid sample liquid in separate bottles. The pipe communicated with the gas-liquid separation device 3 is used for conveying the liquid sample liquid to the material bottle 43 for storage. The number of vials 43 may be determined according to the rotation period. Each vial 43 needs to be coded and used in a round trip. The material bottles 43 need to be put into the turntables 42 according to groups, and the number of the material bottles 43 which can be simultaneously put into the turntables 42 is designed and determined according to actual needs. The PLC system automatically controls the reversible motor 41 to drive the turntable 42 according to a program, so that the material bottles 43 sequentially hold sample liquid. The vial 43 containing the sample fluid is manually removed. The returned empty bottles 43 need to be cleaned and placed correctly on the turn. The turntable 42 can also adopt movable bar blocks, and the PLC system can automatically control the reversible motor 41 to drive the sample storage process according to a program. The material bottle 43 can be kept still, and the PLC system can automatically control the movement of the liquid injection pipe to sample according to a program. The specific mode adopted should be designed and determined according to actual conditions and needs. If the on-line automatic sampling device is directly used in series with an automatic analysis system, the storage unit can be omitted.

The further technical proposal is aimed at the medium of the industrial high-concentration wet-process phosphoric acid production process, has extremely strong corrosiveness, is easy to crystallize and scale, and has extremely high requirements on the corrosion resistance, crystallization resistance and blockage resistance of equipment and pipelines selected by the automatic sampling and filtering equipment. The materials are selected from 304, 316L, 310S, polytetrafluoroethylene, engineering plastics and other materials with high corrosion resistance. On the premise of meeting the actual production control requirement, an intermittent on-line automatic sampling and filtering mode is adopted, so that the contact time of the detection equipment and the pipeline with the anti-corrosion medium is reduced to the maximum extent, and the service cycle of the equipment and the pipeline is prolonged. After each sampling is completed, related equipment and pipelines are cleaned and blown clean in time, so that the interference to the next sampling is eliminated, and meanwhile, the corrosion is relieved.

The working principle and the method of the online sampling device are as follows:

the device and the method can automatically sample and filter on line, take out the phosphoric acid in the slurry of the extraction reaction tank, and provide technical support for manual and automatic analysis of the components of the liquid medium. And then the automatic control can be realized by adopting the sulfuric acid in the extraction reaction tank and adding the flow control and adjustment in series. The technical problem of bottleneck of automatic and intelligent control of the propelling device in horizontal lifting can be thoroughly solved.

The key equipment of the lifting driving device 1 adopts an air cylinder 12, and the key equipment filter element 24 of the liquid-solid separation device 2 adopts a 60 mu m ceramic filter element.

The working process of the device is briefly described as follows:

the PLC control system 7 is a real-time control center of the device and immediately sends out a sampling instruction when the sampling condition is met.

As shown in FIG. 3, the lifting driving device 1 stretches the liquid-solid separation device 2 into the storage tank below the slurry liquid level (the insertion depth H is more than 300 mm), and the vacuum device 6 is automatically started to suck and filter. Under the action of vacuum power, the liquid-solid separation device 2 separates solid phase matters from liquid phase matters in the slurry. The gas-liquid mixture pumped out from the liquid-solid separation device 2 is separated by the gas-liquid separation device 3, the gas phase part is discharged out of the system, and the liquid phase part is sent to the quantitative sample separating and storing device 4 for sub-packaging and storage. After the suction and filtration are completed, the lifting driving device 1 lifts the liquid-solid separation device 2 out of the liquid level (at least more than 500mm from the liquid level height L), and the vacuum device 6 stops. The back-flushing backwashing device 5 is started, and back-flushing backwashing of the liquid-solid separation device 2 and the gas-liquid separation device 3 is automatically completed. After the back flushing backwash is completed, the back flushing backwash device 5 is stopped, the lifting driving device 1 automatically lifts the liquid-solid separation device 2 out of the storage tank for temporary storage, the sampling period is ended, and the next sampling instruction is waited.

The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (7)

1. The utility model provides an online sampling system of slurry, includes lift drive arrangement (1), liquid-solid separation device (2), gas-liquid separation device (3), ration branch appearance storage device (4), blowback backwash device (5) and vacuum apparatus (6), its characterized in that:

the liquid-solid separation device (2), the gas-liquid separation device (3) and the quantitative sample separating and storing device (4) are sequentially communicated; the air outlet of the air-liquid separation device (3) is communicated with the vacuum device (6), and the air inlet of the air-liquid separation device (3) is communicated with the back-flushing backwashing device (5);

the lifting driving device (1) is used for driving the liquid-solid separation device (2) to move up and down; the liquid-solid separation device (2) is used for separating solid phase matters from liquid phase matters in the slurry; the gas-liquid separation device (3) is used for separating the gas-liquid mixture pumped out from the liquid-solid separation device (2), the gas phase part is discharged through the vacuum device (6), and the liquid phase part is sent to the quantitative sample-separating storage device (4) for sub-packaging and storage;

the back-flushing backwashing device (5) is used for back-flushing backwashing of the gas-liquid separation device (3), the liquid-solid separation device (2) and the quantitative sample separating storage device (4).

2. The slurry on-line sampling system of claim 1, wherein: the liquid-solid separation device (2) comprises a lower end enclosure (26), an upper end enclosure (22), a connecting pipe (21), a vacuum suction pipe (28), a back-flushing backwash pipe (27) and a cylindrical filter element (24), wherein the upper end and the lower end of the filter element (24) are respectively connected with the upper end enclosure (22) and the lower end enclosure (26), the upper end of the upper end enclosure (22) is connected with the connecting pipe (21), and the connecting pipe (21) is connected with the lifting driving device (1); one end of the back-flushing backwash pipe (27) extends into the filter element (24), and the other end of the back-flushing backwash pipe is connected with the gas-liquid separation device (3); one end of the vacuum suction pipe (28) extends into the filter element (24), and the other end of the vacuum suction pipe is connected with the gas-liquid separation device (3).

3. The slurry on-line sampling system of claim 2, wherein: the filter element (24) is made of a PP filter membrane or a polypropylene filter cloth.

4. The slurry on-line sampling system of claim 2, wherein: the filter element (24) is a stainless steel or high-temperature ceramic yarn cylinder.

5. The slurry on-line sampling system of claim 1, wherein: the lifting driving device (1) is an air cylinder lifting mechanism.

6. The slurry on-line sampling system of claim 1, wherein: the quantitative sample separating and storing device (4) comprises a rotatable rotary table (42) and a plurality of material bottles (43) arranged on the rotary table (42), and a discharge port of the gas-liquid separating device (3) is communicated with the material bottles (43) through a pipeline.

7. The slurry on-line sampling system of claim 1, wherein: the back-blowing backwashing device (5) is connected with an air inlet pipe and a water inlet pipe.

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