CN114544421B - Sludge dewatering performance measuring device and using method - Google Patents
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- CN114544421B CN114544421B CN202210174409.XA CN202210174409A CN114544421B CN 114544421 B CN114544421 B CN 114544421B CN 202210174409 A CN202210174409 A CN 202210174409A CN 114544421 B CN114544421 B CN 114544421B
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- 239000010802 sludge Substances 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000018044 dehydration Effects 0.000 claims abstract description 42
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 42
- 239000000706 filtrate Substances 0.000 claims abstract description 33
- 238000001914 filtration Methods 0.000 claims abstract description 27
- 238000007789 sealing Methods 0.000 claims description 18
- 238000006073 displacement reaction Methods 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 239000010410 layer Substances 0.000 claims description 6
- 239000002356 single layer Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 16
- 238000001514 detection method Methods 0.000 abstract description 14
- 238000005259 measurement Methods 0.000 abstract description 13
- 238000011156 evaluation Methods 0.000 abstract description 6
- 238000010521 absorption reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000003750 conditioning effect Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000001143 conditioned effect Effects 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003828 vacuum filtration Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
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Abstract
The invention provides a sludge dewatering performance measuring device and a using method thereof. The invention adopts a mechanical squeezing and data acquisition system, so that the detection result is more in line with the condition of mechanical press filtration and dehydration, and the detection process has higher automation degree because the detection process records the filtrate quantity in real time. The method directly estimates the sludge specific resistance according to the inflection point of the linear region, does not need to measure the water content of the sludge cake, and has short measurement process time and higher accuracy and repeatability. In addition, the method provided by the invention can be used for simultaneously measuring the specific resistance and compressibility coefficient of the sludge under the condition of not changing the sludge, so that the measurement steps are simplified, and the comprehensive evaluation of the sludge dewatering performance is realized.
Description
Technical Field
The invention relates to a device for measuring the dehydration performance of sludge and a using method thereof, in particular to a device for measuring the dehydration performance of sludge designed based on a mechanical filter pressing principle and a using method thereof, belonging to the technical field of measurement of analysis of the dehydration performance of sludge.
Background
A large amount of sludge is generated in the wastewater treatment process, and the treatment cost of the sludge directly influences the running cost of the whole wastewater treatment system. Typically, sludge is dewatered prior to final disposal (e.g., landfill, incineration, and composting) to reduce the water content and volume of the sludge. The evaluation of the sludge dewatering performance has important significance for the evaluation of the sludge dewatering process. At present, the evaluation indexes of the sludge dewatering performance mainly comprise: capillary time of water absorption (CST) and sludge Specific Resistance (SRF).
The capillary water absorption time refers to the time required for the sludge water to permeate a certain distance on the filter paper, and can quickly characterize the water filtering performance of the sludge. However, the capillary water absorption time is easily affected by the sludge concentration and the detection temperature, so that the fluctuation of the capillary water absorption time is large. Sludge specific resistance refers to cake resistance per unit filtration area. The sludge specific resistance is mainly measured by adopting a vacuum filtration method, and is not easily influenced by the concentration and the temperature of the sludge. However, in the sludge specific resistance measurement process, manual operations are generally complicated (such as manual pressure adjustment and filtrate volume reading), and the stability of a vacuum system is poor, so that the result is greatly affected by the operation of an experimenter. In addition, it is often necessary to additionally measure the water content of the sludge cake (usually measured by a drying method) in calculating the sludge specific resistance, which greatly prolongs the measurement time of the whole sludge specific resistance.
In the dehydration process of sludge, the sludge is often conditioned to promote the dehydration. The traditional chemical conditioner has small dosage (generally not more than 1% of dry weight of sludge), and does not influence traditional detection indexes (such as sludge specific resistance and capillary water absorption time) to characterize dehydration performance. However, when physical conditioning agents (such as sawdust and fly ash) are used for conditioning, the dosage of the physical conditioning agents can reach 100% of the dry weight of the sludge, and the traditional detection index (especially capillary water absorption time) cannot truly represent the dehydration performance of the conditioned sludge. In addition, when sludge particles are easily deformed (such as biochemical sludge), the sludge has high compressibility in the mechanical dewatering process, and thus, it is also necessary to evaluate the compressibility of the sludge when examining the dewatering performance of the sludge. The sludge dewatering process is divided into a sludge cake forming stage and a sludge cake compressing stage, and the sludge specific resistance data can only reflect the resistance of the sludge cake forming stage and cannot reflect the characteristics of the sludge compressing stage. The compression stage of the high-compressibility sludge is long, and the conventional system for pushing the sludge interface by gas is likely to break the sludge cake before the compression stage is not stabilized, so that the system is difficult to be used for the sludge compressibility experiment.
In summary, the current traditional detection indexes (capillary water absorption time and sludge specific resistance) mainly represent the drainage performance of sludge in a biased manner, the compression performance of sludge is hard to represent, the measurement complexity and the detection time of sludge specific resistance are long, and the rapid, effective and comprehensive evaluation of the sludge dewatering performance cannot be satisfied.
Disclosure of Invention
Aiming at the situation, the invention aims to solve the defects of the prior art, and provides a device for measuring the dehydration performance of sludge and a use method thereof, which solve the problems that the artificial repeatability of the measurement and detection of specific resistance of sludge is poor, the detection time is long, and the compressibility of sludge cannot be evaluated at the same time.
The technical scheme of the invention is as follows:
the sludge dewatering performance measuring device comprises a bracket (1), a dewatering device main body (2), a cylinder (3), a linear displacement sensor (4), a connector (5), a pressure sensor (6), a liquid storage tank (7), an electronic balance (8), an electromagnetic valve (9), an air compressor (10), a data acquisition system (11), a mud adding valve (12) and an exhaust valve (13); the cylinder (3) and the linear displacement sensor (4) are fixed on the upper layer of the bracket (1), a piston rod in the cylinder (3) is connected with a measuring rod of the linear displacement sensor (4) by a connector (5), and the vertical directions of the cylinder and the linear displacement sensor are completely synchronous; the dehydration device main body (2) is arranged at the middle layer of the bracket (1), and one end of a piston rod of the air cylinder (3) is fixed on a piston (23) of the dehydration device main body (2); the electronic balance (8) is arranged right below the dehydration device main body (2), and the liquid storage tank (7) is arranged above the electronic balance (8) and is used for receiving filtrate discharged by the dehydration device main body (2); an inlet of the electromagnetic valve (9) is connected with the air compressor (10), two outlets of the electromagnetic valve are connected with the air cylinder (3), the pressure sensor (6) is arranged on the piston (23) of the dewatering device main body (2), and the mud adding valve (12) and the exhaust valve (12) are respectively connected with the piston (23) through pipelines; the communication wires of the pressure sensor (6), the electronic balance (8) and the electromagnetic valve (9) are connected with the data acquisition system (11).
The dewatering device main body (2) consists of an upper cylinder (21) and a lower cylinder (22), wherein a piston (23) is arranged in the upper cylinder (21); the top of the upper cylinder body (21) is of a cylinder structure, the bottom of the upper cylinder body is of a flange structure, and a first sealing gasket (25) is arranged on the bottom surface of the upper cylinder body (21); the top of the lower cylinder (22) is of a flange structure, is aligned with the bottom of the upper cylinder (21), can be fastened by bolts, and the bottom of the lower cylinder (22) is of a funnel structure; a porous plate (24) is arranged in the lower cylinder (22), the top surface of the porous plate (24) is flush with the top surface of the lower cylinder (22), and a second sealing gasket (26) is arranged on the top surface of the lower cylinder (22); the filter material (27) can be a single-layer filter paper or an upper filter paper lower filter paper, and is placed between the first sealing gasket (25) and the second sealing gasket (26), and the diameter of the filter material is larger than the inner diameter of the upper cylinder (21) and smaller than the diameters of the first sealing gasket (25) and the second sealing gasket (26).
The piston (23) is provided with a first through hole (231), a second through hole (232) and a third through hole (233), wherein the first through hole (231) is connected with the pressure sensor (6), the second through hole (232) is communicated with the mud valve (12) through a pipeline, and the third through hole (233) is communicated with the exhaust valve (13) through a transparent pipeline; there are two seals (234) between the piston (23) and the upper cylinder (21) so that the piston (23) can remain vertically movable without leakage within the upper cylinder (21).
The electromagnetic valve (9) is of a three-position five-way type.
The data acquisition system (11) comprises a computer, a data acquisition card with a USB interface and a software program, the data acquisition system (11) can change the on-off state of the electromagnetic valve (9) through communication signals to realize the up-and-down movement of the air cylinder (3), and the liquid filtering amount and the piston height position at different moments are respectively recorded through the communication signals of the collecting electronic balance (8) and the linear displacement sensor (4).
The application method of the sludge dewatering performance measuring device comprises the following steps:
1) Starting an electronic balance (8), an air compressor (10) and a data acquisition system (11); opening a mud valve (12) and an exhaust valve (13);
2) A filtering material (27) is placed, and an upper cylinder (21) and a lower cylinder (22) of the dewatering device main body (2) are fastened by bolts;
3) Opening a software program of a data acquisition system (11), setting the height position and the pressure of a piston (23), running the software program, recording the liquid amount in a liquid storage tank (7) and the height position of the piston (23) in real time by the data acquisition system (11) through an electronic balance (8) and a linear displacement sensor (4), moving a cylinder (3) by controlling an air magnetic valve (9), adjusting the piston (23) to a required position, adding sludge into an upper cylinder (21) through a sludge adding valve (12), and rapidly closing the sludge adding valve (12) and the exhaust valve (13) until the sludge appears in a transparent pipeline connected with the exhaust valve (13);
4) The piston (23) is adjusted to move downwards through the electromagnetic valve (9) until the signal fed back by the pressure sensor (6) reaches the set pressure, and the pressure is kept unchanged;
5) The sludge specific resistance measuring step adopts the steps (1) - (4), then the filtration stage end point is judged according to the time-varying signal of the filtrate quantity fed back by an electronic balance (8), and the filtration stage end point is judged based on the time-varying quantity of the filtrate quantity-1/filtrate quantity (namely V-deltat/deltaV, wherein V is filtrate volume = filtrate quantity/filtrate density, t is time) in which a linear region inflection point appears, the sludge Specific Resistance (SRF) is calculated according to the slope of the linear region and the filtrate quantity of the filtration stage end point, and the calculation formula is that
Wherein: a-filtration area, P-pressure sensor reading (i.e. dewatering pressure), μ -filtrate viscosity, c-dry sludge weight per filtrate volume of filtration (c=cv/V f Initial concentration of C-sludge, volume of initial sludge in V-dewatering device, V f -the filtrate volume corresponding to the end of the filtration stage), the slope of the K-linear region;
6) The sludge compressibility coefficient measuring step adopts at least three different pressures, the pressure is set from low to high, and the dehydration time under each pressure is not less than 1.5h; the first pressurized dehydration step is the same as the above steps (1) to (4) except that different pressures and dehydration times are initially set; after the last pressure dehydration is completed, directly pressurizing the mud cake again to a set value by adopting the step (4); recording the height position of the piston (23) at the dewatering end point moment under different pressures; the sludge compression coefficient gamma is obtained by adopting least square fitting according to the following formula:
wherein: h is a 0 -initial piston height after addition of sludge; h is a i Or h j -the piston height position at the i-th or j-th dewatering endpoint time; p (P) i Or P j -pressure at the ith or jth dewatering.
The invention has the beneficial effects that:
(1) Traditional SRF detection is usually carried out by adopting a Buchner funnel under the condition of negative pressure, and the water content of a filter cake at the end point needs to be measured, so that the manual operation is complex and the measurement time is too long. The invention adopts a mechanical squeezing and data acquisition system, so that the detection result is more in line with the condition of mechanical press filtration and dehydration, the detection process records the filtrate quantity in real time, and the self-detection process has higher automation degree. The method directly estimates the sludge specific resistance according to the inflection point of the linear region, does not need to measure the water content of the sludge cake, and has short measurement process time and higher accuracy and repeatability.
(2) The device and the method provided by the invention can be used for simultaneously measuring the specific resistance and the compressibility coefficient of the sludge under the condition of not changing the sludge, so that the measurement steps are simplified, and the comprehensive evaluation of the dewatering performance of the sludge is realized.
Drawings
FIG. 1 is a schematic diagram of a sludge dewatering performance measuring apparatus
FIG. 2 is a schematic diagram of the main structure of the dewatering device
FIG. 3 is a schematic diagram showing the end point judgment of the filtration curves V to Δt/ΔV and the filtration stage
FIG. 4 is a schematic diagram showing the measurement and calculation of specific resistance of sludge
FIG. 5 is a schematic diagram showing measurement and calculation of compressibility of sludge
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Embodiment one:
as shown in fig. 1 and 2, a sludge dewatering performance measuring device comprises a bracket (1), a dewatering device main body (2), a cylinder (3), a linear displacement sensor (4), a connector (5), a pressure sensor (6), a liquid storage tank (7), an electronic balance (8), an electromagnetic valve (9), an air compressor (10), a data acquisition system (11), a mud adding valve (12) and an exhaust valve (13); the cylinder (3) and the linear displacement sensor (4) are fixed on the upper layer of the bracket (1), a piston rod in the cylinder (3) is connected with a measuring rod of the linear displacement sensor (4) by a connector (5), and the vertical directions of the cylinder and the linear displacement sensor are completely synchronous; the dehydration device main body (2) is arranged at the middle layer of the bracket (1), and one end of a piston rod of the air cylinder (3) is fixed on a piston (23) of the dehydration device main body (2); the electronic balance (8) is arranged right below the dehydration device main body (2), and the liquid storage tank (7) is arranged above the electronic balance (8) and is used for receiving filtrate discharged by the dehydration device main body (2); an inlet of the electromagnetic valve (9) is connected with the air compressor (10), two outlets of the electromagnetic valve are connected with the air cylinder (3), the pressure sensor (6) is arranged on the piston (23) of the dewatering device main body (2), and the mud adding valve (12) and the exhaust valve (12) are respectively connected with the piston (23) through pipelines; the communication wires of the pressure sensor (6), the electronic balance (8) and the electromagnetic valve (9) are connected with the data acquisition system (11).
As shown in fig. 2, the main body (2) of the dehydration device is composed of an upper cylinder (21) and a lower cylinder (22), and a piston (23) is arranged in the upper cylinder (21); the top of the upper cylinder body (21) is of a cylinder structure, the bottom of the upper cylinder body is of a flange structure, and a first sealing gasket (25) is arranged on the bottom surface of the upper cylinder body (21); the top of the lower cylinder (22) is of a flange structure, is aligned with the bottom of the upper cylinder (21), can be fastened by bolts, and the bottom of the lower cylinder (22) is of a funnel structure; a porous plate (24) is arranged in the lower cylinder (22), the top surface of the porous plate (24) is flush with the top surface of the lower cylinder (22), and a second sealing gasket (26) is arranged on the top surface of the lower cylinder (22); the filter material (27) can be an upper filter paper lower filter screen, and is placed between the first sealing gasket (25) and the second sealing gasket (26), and the diameter of the filter material is larger than the inner diameter of the upper cylinder (21) and smaller than the diameters of the first sealing gasket (25) and the second sealing gasket (26).
The piston (23) is provided with a first through hole (231), a second through hole (232) and a third through hole (233), wherein the first through hole (231) is connected with the pressure sensor (6), the second through hole (232) is communicated with the mud valve (12) through a pipeline, and the third through hole (233) is communicated with the exhaust valve (13) through a transparent pipeline; there are two seals (234) between the piston (23) and the upper cylinder (21) so that the piston (23) can remain vertically movable without leakage within the upper cylinder (21).
The electromagnetic valve (9) is three-position five-way.
The data acquisition system (11) comprises a computer, a data acquisition card with a USB interface and a software program, the data acquisition system (11) can change the on-off state of the electromagnetic valve (9) through communication signals to realize the up-and-down movement of the air cylinder (3), and the liquid filtering amount and the piston height position at different moments are respectively recorded through the communication signals of the collecting electronic balance (8) and the linear displacement sensor (4).
The application method of the sludge dewatering performance measuring device comprises the following steps:
1) Starting an electronic balance (8), an air compressor (10) and a data acquisition system (11); opening a mud valve (12) and an exhaust valve (13);
2) A filtering material (27) is placed, and an upper cylinder (21) and a lower cylinder (22) of the dewatering device main body (2) are fastened by bolts;
3) Opening a software program of a data acquisition system (11), setting the height position and the pressure of a piston (23), running the software program, recording the liquid amount in a liquid storage tank (7) and the height position of the piston (23) in real time by the data acquisition system (11) through an electronic balance (8) and a linear displacement sensor (4), moving a cylinder (3) by controlling an air magnetic valve (9), adjusting the piston (23) to a required position, adding sludge into an upper cylinder (21) through a sludge adding valve (12), and rapidly closing the sludge adding valve (12) and the exhaust valve (13) until the sludge appears in a transparent pipeline connected with the exhaust valve (13);
4) The piston (23) is adjusted to move downwards through the electromagnetic valve (9) until the signal fed back by the pressure sensor (6) reaches the set pressure (such as 0.05 MPa), and the pressure is kept unchanged;
5) As shown in FIG. 4, the sludge specific resistance measuring step adopts the steps (1) - (4) above, then the end point of the filtration stage is judged according to the time-varying signal of the filtrate volume fed back by the electronic balance (8) and based on the time-varying amount of the filtrate volume-1/filtrate volume (i.e., V-Deltat/DeltaV, where V is filtrate volume = filtrate volume/filtrate density, since the solid content in the filtrate is very low, regarded as pure water, pure water density is used instead of filtrate density calculation, and t is time) with the linear region inflection point
FIG. 3) calculating sludge Specific Resistance (SRF) from the slope of the linear region and the filtrate amount at the end of the filtration stage, the calculation formula being
Wherein: a-filtration area, P-pressure sensor reading (i.e. dewatering pressure), μ -filtrate viscosity, c-dry sludge weight per filtration unit volume (c=cv/V f Initial concentration of C-sludge, volume of initial sludge in V-dewatering device, V f -the filtrate volume corresponding to the end of the filtration stage), the slope of the K-linear region;
6) As shown in fig. 5, at least three different pressures (e.g., 0.05,0.25,0.5 mpa) are used in the sludge compressibility factor measurement step, the pressure is set from low to high, and the dehydration time is 1.5h at each pressure; the first pressurized dehydration step is the same as the above steps (1) to (4) except that different pressures and dehydration times are initially set; after the last pressure dehydration is finished, the mud is not required to be added again, and the mud cake is directly pressurized again to a set value in the step (4); recording the height position of the piston (23) at the dewatering end point moment under different pressures; the sludge compression coefficient gamma is obtained by adopting least square fitting according to the following formula:
wherein: h is a 0 -initial piston height after addition of sludge; h is a i Or h j -the piston height position at the i-th or j-th dewatering endpoint time; p (P) i Or P j -pressure at the ith or jth dewatering.
Embodiment two:
the second embodiment is basically the same as the first embodiment, and the main difference is that: after the sludge specific resistance (namely V-delta t/delta V with linear area inflection point) is measured, the dehydration time is still waited to 1.5h, the height position of the piston (23) at the first dehydration end point time is recorded, then the step (4) is adopted for direct pressurizing dehydration according to the step of measuring the sludge compressibility coefficient, and the height position of the piston (23) at the dehydration end point time under different pressures is recorded, so that the sludge specific resistance and the sludge compressibility coefficient can be measured simultaneously under the condition of not changing sludge.
Claims (5)
1. The method for measuring the sludge dewatering performance is characterized by comprising the following steps of:
1) Starting an electronic balance, an air compressor and a data acquisition system; opening a mud adding valve and an exhaust valve;
2) Placing filtering materials, and fastening an upper cylinder and a lower cylinder of a main body of the dehydration device by bolts;
3) The method comprises the steps of opening a software program of a data acquisition system, setting the height position and the pressure of a piston, running the software program, recording the liquid quantity in a liquid storage tank and the height position of the piston in real time by the data acquisition system through an electronic level sensor and a linear displacement sensor respectively, moving a cylinder by controlling an air magnetic valve, adjusting the piston to a required position, adding sludge into an upper cylinder body through a sludge adding valve, and quickly closing the sludge adding valve and the exhaust valve until the sludge appears in a transparent pipeline connected with the exhaust valve;
4) The piston is adjusted to move downwards through the electromagnetic valve until the signal fed back by the pressure sensor reaches the set pressure, and the pressure is kept unchanged;
5) The sludge specific resistance measuring step adopts the steps (1) - (4), then the end point of the filtering stage is judged according to the time-varying signal of the filtrate volume fed back by the electronic balance and the inflection point of the linear region appears based on the time-varying quantity of the filtrate volume-1/filtrate volume, the sludge Specific Resistance (SRF) is calculated according to the slope of the linear region and the filtrate volume of the end point of the filtering stage, and the calculation formula is as follows
Wherein: a-filtration area, P-pressure sensor reading, mu-filtrate viscosity, c-filtration sludge dry weight per filtrate volume, slope of K-linear zone;
6) The sludge compressibility coefficient measuring step adopts at least three different pressures, the pressure is set from low to high, and the dehydration time under each pressure is not less than 1.5h; the first pressurized dehydration step is the same as the above steps (1) to (4) except that different pressures and dehydration times are initially set; after the last pressure dehydration is completed, directly pressurizing the mud cake again to a set value by adopting the step (4); recording the height position of the piston at the dehydration end point under different pressures; the sludge compression coefficient gamma is obtained by adopting least square fitting according to the following formula:
wherein: h is a 0 -initial piston height after addition of sludge; h is a i Or h j -the piston height position at the i-th or j-th dewatering endpoint time; p (P) i Or P j -pressure at the ith or jth dewatering.
2. An apparatus for realizing the method for measuring the dewatering performance of sludge as claimed in claim 1, characterized in that: the device comprises a bracket, a dehydration device main body, an air cylinder, a linear displacement sensor, a connector, a pressure sensor, a liquid storage tank, an electronic balance, an electromagnetic valve, an air compressor, a data acquisition system, a mud adding valve and an exhaust valve; the cylinder and the linear displacement sensor are fixed on the upper layer of the bracket, and a piston rod in the cylinder is connected with a measuring rod of the linear displacement sensor by adopting a connector, so that the vertical direction of the cylinder is completely synchronous; the dehydration device main body is arranged at the middle layer of the bracket, and one end of a cylinder piston rod is fixed on a piston of the dehydration device main body; the electronic day is horizontally arranged under the main body of the dehydration device, and the liquid storage tank is arranged on the electronic balance and is used for receiving filtrate discharged by the main body of the dehydration device; an inlet of the electromagnetic valve is connected with the air compressor, two outlets of the electromagnetic valve are connected with the air cylinder, the pressure sensor is arranged on a piston of the dewatering device main body, and the mud adding valve and the exhaust valve are respectively connected with the piston through pipelines; the communication wires of the pressure sensor, the electronic balance and the electromagnetic valve are connected with the data acquisition system, the piston is provided with a first through hole, a second through hole and a third through hole, wherein the first through hole is connected with the pressure sensor, the second through hole is communicated with the mud adding valve through a pipeline, and the third through hole is communicated with the exhaust valve through a transparent pipeline; there are two seals between the piston and the upper cylinder so that the piston can remain vertically movable without leakage in the upper cylinder.
3. The apparatus of claim 2, wherein the body of the dehydrating apparatus comprises an upper cylinder and a lower cylinder, and a piston is provided in the upper cylinder; the top of the upper cylinder body is of a cylinder structure, the bottom of the upper cylinder body is of a flange structure, and a first sealing gasket is arranged on the bottom surface of the upper cylinder body; the top of the lower cylinder body is of a flange structure and is aligned with the bottom of the upper cylinder body, and is fastened by bolts, and the bottom of the lower cylinder body is of a funnel structure; a porous plate is arranged in the lower cylinder body, the top surface of the porous plate is flush with the top surface of the lower cylinder body, and a second sealing gasket is arranged on the top surface of the lower cylinder body; the filter material adopts a single-layer filter paper or a single-layer filter screen or a lower filter screen of an upper filter paper, is placed between the first sealing gasket and the second sealing gasket, has a diameter larger than the inner diameter of the upper cylinder body and smaller than the diameters of the first sealing gasket and the second sealing gasket.
4. A device according to claim 2, wherein the solenoid valve is of the three-position five-way type.
5. The device according to claim 2, wherein the data acquisition system comprises a computer, a data acquisition card with a USB interface and a software program, the data acquisition system changes the on-off state of the electromagnetic valve through communication signals to realize the up-and-down movement of the air cylinder, and the communication signals of the electronic level and the linear displacement sensor are collected to record the liquid filtering amount and the piston height position at different moments respectively.
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| CN102721787A (en) * | 2011-03-30 | 2012-10-10 | 同济大学 | Organic garbage compression dehydration performance detection device |
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