CN111735510A - Device and method for online detection of slurry solid content based on series connection of mass flow controllers - Google Patents

Device and method for online detection of slurry solid content based on series connection of mass flow controllers Download PDF

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CN111735510A
CN111735510A CN202010526477.9A CN202010526477A CN111735510A CN 111735510 A CN111735510 A CN 111735510A CN 202010526477 A CN202010526477 A CN 202010526477A CN 111735510 A CN111735510 A CN 111735510A
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mass flow
slurry
flow controller
solid content
differential pressure
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CN111735510B (en
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郑征
毛海良
马剑斌
徐锦龙
王松林
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Zhejiang Henglan Technology Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
    • G01F1/88—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure with differential-pressure measurement to determine the volume flow

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Abstract

The invention relates to the technical field of sizing detection of sizing, and discloses an online slurry solid content detection device and method based on series connection of mass flow controllers, wherein the device comprises a main slurry tank and a preheating slurry tank which are sequentially connected according to the flow direction; still be connected with the thick liquid circulation line between main thick liquid case and the preheating thick liquid case, be equipped with the solid rate detection line that flows to preheating thick liquid case on the thick liquid circulation line, it has Coriolis mass flow controller and hot type mass flow controller or differential pressure formula mass flow controller to establish ties in proper order according to the flow direction on the solid rate detection line. The invention is connected with Coriolis mass flow controller and thermal mass flow controller or differential pressure type mass flow controller in series in front and at the back of the solid content rate detection line, and the solid content rate of the slurry can be accurately detected on line through the combination of the two mass flow controllers.

Description

Device and method for online detection of slurry solid content based on series connection of mass flow controllers
Technical Field
The invention relates to the technical field of sizing detection of sizing, in particular to a device and a method for detecting the solid content of a sizing solution on line based on series connection of mass flow controllers.
Background
In the warp sizing process, in order to evaluate the sizing effect, real-time detection and control of the sizing rate of the sizing are needed. Currently, the sizing rate detection in a laboratory is to sample, desize, dry and weigh sized yarns formed by sizing, calculate according to the definition of the sizing rate, and bring certain errors to the calculation of the sizing rate because some fibers fall off on the surface of the sized yarns in the desizing process; the sizing percentage detection of a sizing workshop is to obtain the total mass of the sizing through the difference value of a sizing shaft and an empty weaving shaft, measure the moisture regain of the sizing by a moisture meter, calculate the total dry weight of the sizing, calculate the dry weight of warp according to the linear density, the total warp number, the winding length and the like of the yarn on the sizing shaft, calculate according to the definition of the sizing percentage, and have relatively low detection precision because the calculation result is easily influenced by some inaccurate data, such as the elongation of the sizing, the winding length and the like. The detection method is long in time consumption, cannot realize online and real-time detection, cannot timely find that the sizing rate exceeds a reasonable range or has poor uniformity and consistency and the like in the sizing process, and has certain errors, so that the sizing rate needs to be detected online and accurately by adopting a rapid and accurate method.
As is well known, the on-line and real-time detection can be realized by utilizing a sensor technology, and the on-line and accurate detection of the sizing rate is a difficult problem in the production of slashing due to a plurality of factors influencing the sizing rate in the sizing process. Currently, the sizing rate can be detected in real time by means of related sensor technology as the main factors affecting the sizing rate, and the sizing rate is calculated by means of the mathematical relationship between these factors and the sizing rate. The solid content of the size (the percentage of the size in the size and the weight of the size) and the pressed moisture regain of the sizing (the moisture regain of the sizing just after the sizing is discharged from a sizing tank) are determining factors directly influencing the sizing rate, and the real-time values of the solid content of the size and the pressed moisture regain of the yarn in the sizing process are detected by adopting related sensors, so that the real-time values of the sizing rate can be obtained. With the successful application of the warp sizing linear pressurizing technology, the stable control of the sizing extruding weighting rate is realized, the sizing rate is detected on line and accurately, and the sizing rate is indirectly converted into the on-line and accurate detection of the solid content of the sizing solution. Therefore, the online and accurate detection of the solid content of the slurry is very important for detecting the sizing rate.
In the prior art, refractometers connected in parallel on a slurry circulation pipeline are used for detecting the solid content of slurry on line. The principle of the refractometer for measuring the solid content of the slurry is as follows: and calculating the solid content of the slurry by using the measured refractive index according to the known corresponding relation between the solid content of the slurry and the refractive index. However, temperature has an effect on the refractive index of a substance, and in practice, refractometers are very sensitive to small changes in temperature, so the known relationship between slurry solid content and refractive index is applicable only to one specified temperature, and not to others. Therefore, the refractometer is preferably measured at a prescribed temperature. However, in actual use, the temperature often does not reach a predetermined temperature, and therefore, it is necessary to correct the temperature of the measurement result. But only a few substances have temperature deviation coefficients or temperature deviation tables for temperature correction of the values of the solid content of the slurry measured by the refractometer. In fact, the influence of temperature on the refractive index of different substances is different, and the existing temperature deviation coefficients or temperature deviation tables for temperature correction are not suitable for most other substances. Therefore, the refractometer detects the deviation of the solid content of the slurry.
Disclosure of Invention
In order to solve the technical problems, the invention provides a device and a method for detecting the solid content of the slurry on line based on the serial connection of mass flow controllers.
The specific technical scheme of the invention is as follows: an online slurry solid content detection device based on serial connection of mass flow controllers comprises a main slurry tank and a preheating slurry tank which are sequentially connected in flow direction; still be connected with the thick liquid circulation line between main thick liquid case and the preheating thick liquid case, be equipped with the solid rate detection line that flows to preheating thick liquid case on the thick liquid circulation line, it has Coriolis mass flow controller and hot type mass flow controller or differential pressure formula mass flow controller to establish ties in proper order according to the flow direction on the solid rate detection line.
Preferably, a slurry circulation pump is provided in the slurry circulation line.
Preferably, the slurry circulation pump is located upstream of the point of connection of the slurry circulation line to the solid content detection line.
Preferably, the coriolis mass flow controller, thermal mass flow controller and differential pressure mass flow controller are devices having a flow measurement assembly and a flow conditioning assembly and a signal transmission assembly with a response time of less than 0.1 second and a lower flow control limit of 0.1 kg/hr.
Preferably, the thermal mass flow controller is a refrigeration thermal liquid mass flow controller.
Preferably, the differential pressure type mass flow controller is a V-cone liquid mass flow controller.
A method for detecting the solid content of the slurry on line by using the device comprises the following steps: and the slurry overflowing from the main slurry tank enters the preheating slurry tank and then enters the slurry circulating line, one part of the slurry is conveyed back to the main slurry tank, and the other part of the slurry is introduced into the solid content detection line and then enters the preheating slurry tank again after sequentially passing through the Coriolis mass flow controller and the thermal mass flow controller or the differential pressure mass flow controller.
The mass flow of the slurry on the solid content detection line is controlled by the Coriolis mass flow controller, and the solid content of the slurry is calculated and determined after the reading ratio of the thermal mass flow controller and the Coriolis mass flow controller or the reading ratio of the differential pressure mass flow controller and the Coriolis mass flow controller is subjected to formula conversion.
Preferably, the formula is derived from the Coriolis mass flow controller, thermal mass flow controller and differential pressure mass flow controller measurement and control principles, and slurry macro physical properties (specific heat capacity, viscosity, density) are a function of slurry composition:
Figure BDA0002531572870000021
wherein:
QC: a flow reading of the coriolis mass flow controller;
QT: flow readings of a thermal mass flow controller;
mS: solid content of the slurry;
cM: the thermal mass flow controller calibrates the specific heat capacity value of the liquid;
cmix＝cmix(mS): the specific heat capacity value of the slurry is mSA function of (a);
cmix＝mS·cS+(1-mS)·cW＝cmix(mS)
in the formula, cS、cWIs the specific heat capacity of the slurry and water;
or
Figure BDA0002531572870000031
Wherein:
QD: a flow reading of the differential pressure mass flow controller;
ηmix＝ηmix(ms): viscosity number of the slurry, with respect to mSA function of (a);
ηL: the differential pressure type mass flow controller calibrates the viscosity value of the liquid;
ρmix＝ρmix(mS): density value of the slurry is mSA function of (a);
ρL: the density value of the liquid is calibrated by the differential pressure type mass flow controller;
Figure BDA0002531572870000032
in the formula, ηS、ηWViscosity of the slurry and water respectively; mS、MWThe molar mass of the slurry and the molar mass of the water are respectively;
Figure BDA0002531572870000033
in the formula, ρS、ρWThe density of the slurry and water, respectively.
Preferably, the accuracy of the coriolis mass flow controller is ± 0.5%, the accuracy of the thermal mass flow controller is ± 0.9%, the accuracy of the differential pressure mass flow controller is ± 0.4%, and the maximum deviation of the slurry solid content detection is less than ± 0.9%.
Preferably, the maximum deviation of the slurry solid content detection is less than ± 0.3%.
Compared with the prior art, the invention has the beneficial effects that: the invention is connected with Coriolis mass flow controller and thermal mass flow controller or differential pressure type mass flow controller in series in front and at the back of the solid content rate detection line, and the solid content rate of the slurry can be accurately detected on line through the combination of the two mass flow controllers.
Drawings
FIG. 1 is a schematic diagram of the connection of an on-line slurry solid content rate measuring device based on the series connection of a Coriolis mass flow controller and a thermal mass flow controller;
FIG. 2 is a schematic diagram of the connection of an on-line slurry solid content detection device based on the series connection of a Coriolis mass flow controller and a differential pressure mass flow controller;
FIG. 3 is a schematic view of the flow measurement and control principles of a Coriolis mass flow controller (Prior Art);
FIG. 4 is a schematic diagram of the flow measurement principle of a thermal mass flow controller;
fig. 5 is a schematic view of the flow measurement principle of a differential pressure mass flow controller (prior art).
The reference signs are: the device comprises a main slurry tank 1, a preheating slurry tank 2, a slurry circulating line 3, a solid content detection line 4, a Coriolis mass flow controller 5, a thermal mass flow controller 6, a differential pressure type mass flow controller 7 and a slurry circulating pump 8.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
An online slurry solid content detection device based on series connection of mass flow controllers is shown in figure 1 and comprises a main slurry tank 1 and a preheating slurry tank 2 which are sequentially connected in a flow direction; still be connected with thick liquid circulation line 3 between main thick liquid case and the thick liquid case of preheating, be equipped with the solid rate detection line 4 that flows to preheating the thick liquid case on the thick liquid circulation line, it has Coriolis mass flow controller 5 and hot type mass flow controller 6 to establish ties in proper order according to the flow direction on the solid rate detection line.
Wherein, a slurry circulating pump is arranged on the slurry circulating line. And the slurry circulating pump is positioned at the upstream of the connection point of the slurry circulating line and the solid content detection line.
The coriolis mass flow controller and thermal mass flow controller are devices having a flow measurement assembly and a flow conditioning assembly and a signal transfer assembly with a response time of less than 0.1 seconds and a lower flow control limit of 0.1 kilograms per hour.
A method for detecting the solid content of slurry on line based on the series connection of mass flow controllers comprises the following steps: the slurry overflowing from the main slurry box enters the preheating slurry box and then enters the slurry circulating line, one part of the slurry is conveyed to the main slurry box, the other part of the slurry is introduced into the solid content detection line, and the slurry enters the preheating slurry box after sequentially passing through the Coriolis mass flow controller and the thermal mass flow controller.
The mass flow of the slurry on the solid content rate detection line is controlled by the Coriolis mass flow controller, and the solid content rate of the slurry is calculated and determined by performing formula conversion on the reading ratio of the thermal mass flow controller and the Coriolis mass flow controller.
Wherein the formula is:
Figure BDA0002531572870000041
wherein:
QC: a flow reading of the coriolis mass flow controller;
QT: flow readings of a thermal mass flow controller;
mS: solid content of the slurry;
cmix＝cmix(mS): the specific heat capacity value of the slurry is mSA function of (a);
cM: the thermal mass flow controller calibrates the specific heat capacity value of the liquid.
The precision of the Coriolis mass flow controller is +/-0.5%, the precision of the thermal mass flow controller is +/-0.9%, and the maximum deviation of the slurry solid content detection is less than +/-0.9%. As a further preferred option, the maximum deviation of the slurry solids content measurement is less than. + -. 0.4%.
As shown in fig. 3 (taking a "U" type vibrating tube coriolis mass flow controller as an example), the measurement and control principle of the coriolis mass flow controller is as follows: all coriolis mass flow controllers are based on the principle that when a fluid flows through a vibrating tube, coriolis force proportional to the mass flow is generated and measured and controlled, thus achieving true high-precision direct flow measurement and control. The driven measuring tube oscillates up and down in a sinusoidal manner, and the electromagnetic sensor can output a signal representing the sinusoidal movement of the measuring tube. When the fluid passes through the measuring tube, Coriolis force is generated to deform the front half and the rear half of the measuring tube in opposite directions, which generates a time difference deltat (sinusoidal motion signal phase difference) between the two sensors, and when the mass flow rate is increased, the deformation degree of the measuring tube is increased, and the time difference between the two sensors is increased. The mass flow rate is determined by:
Q＝k·Δt (3)
wherein Q is the mass flow, k is the flow calibration coefficient, and Δ t is the time difference, thus realizing the direct measurement and control of the mass flow. In summary, there are:
QC＝Q (4)
wherein Q isCIs the flow reading of the coriolis mass flow controller and Q is the true mass flow of the slurry on the solid content detection line.
As shown in fig. 4, the thermal mass flow controller works on the principle that: when a fluid passes through a section of flow channel heated by constant power, a linear relation exists between the product of the specific heat capacity and the mass flow of the fluid and the temperature difference between two ends of the flow channel, namely:
ΔT＝T2-T1＝A·P·CP·Q (5)
wherein, Delta T is the temperature difference at two ends of the flow channel; cPIs the specific heat capacity of the fluid; p is the heating power of the runner; a is a proportionality constant; q is the mass flow rate of the fluid.
Most of thermal mass flow controllers are based on heating fluid, but in the case of liquid fluid, particularly in the case of sizing, the temperature of slurry is generally 90-100 ℃, the slurry is heated, and water in the slurry is easily gasified by heating, so that the flow measurement is influenced. The refrigerating thermal type liquid mass flow controller adopts a method opposite to heating, is based on cooling liquid, is very suitable for measuring the mass flow of the liquid easy to gasify, and has the same flow measurement principle as that of a thermal type mass flow controller based on heating liquid.
For thermal flow meters, the following flow conversion equation exists:
Figure BDA0002531572870000061
in the formula, QTIs a measured value of mass flow of the thermal flowmeter based on a calibration fluid, cMIs the specific heat capacity value of the calibration fluid, and is a constant; q is the true mass flow rate of the fluid; c. Cmix＝cmix(mS) Is the specific heat capacity value of the fluid, which is the solid content m of the slurrySAs a function of (c).
From formula (4), there are:
Figure BDA0002531572870000062
the specific heat capacity of the slurry is defined as the heat absorbed or released by the slurry of unit mass when the temperature of the slurry changes by 1 ℃, and according to the heat balance, the specific heat capacity of the slurry is as follows:
cmix＝mS·cS+mW·cW(7)
in the formula, cS、cWSpecific heat capacity of slurry and water, mWIs the water content of the slurry.
Due to specific heat capacity c of slurry and waterS、cWIs a constant, and mS+m W1, then, the specific heat capacity c of the slurrymixIs the solid content m of the slurrySA function of, i.e.
cmix＝mS·cS+(1-mS)·cW＝cmix(mS) (8)
The mass flow of the slurry on the solid content rate detection line is controlled to be constant by a Coriolis mass flow controller, and the reading ratio of the thermal mass flow controller and the Coriolis mass flow controller
Figure BDA0002531572870000063
And (4) calculating the solid content of the slurry by the computer according to the formulas (1) and (8).
Example 2
An online slurry solid content detection device based on serial connection of mass flow controllers is shown in figure 2 and comprises a main slurry tank 1 and a preheating slurry tank 2 which are sequentially connected in a flow direction; still be connected with thick liquid circulation line 3 between main thick liquid case and the preheating thick liquid case, be equipped with the solid rate detection line 4 that contains that flows to preheating the thick liquid case on the thick liquid circulation line, it has Coriolis mass flow controller 5 and differential pressure formula mass flow controller 7 to establish ties in proper order according to the flow direction on the solid rate detection line.
Wherein, a slurry circulating pump is arranged on the slurry circulating line. And the slurry circulating pump is positioned at the upstream of the connection point of the slurry circulating line and the solid content detection line.
The coriolis mass flow controller and differential pressure mass flow controller are devices having a flow measurement assembly and a flow conditioning assembly and a signal transmission assembly with a response time of less than 0.1 seconds and a lower flow control limit of 0.1 kilograms per hour.
A method for online detection of slurry solid content based on mass flow controller series connection comprises the following steps: the slurry overflowing from the main slurry box enters the preheating slurry box and then enters the slurry circulating line, one part of the slurry is conveyed to the main slurry box, the other part of the slurry is introduced into the solid content detection line, and the slurry enters the preheating slurry box after sequentially passing through the Coriolis mass flow controller and the differential pressure type mass flow controller.
The mass flow of the slurry on the solid content rate detection line is controlled by the Coriolis mass flow controller, and the solid content rate of the slurry is calculated and determined by performing formula conversion on the reading ratio of the differential pressure type mass flow controller and the Coriolis mass flow controller.
Wherein the formula is:
Figure BDA0002531572870000071
wherein:
QC: a flow reading of the coriolis mass flow controller;
QD: a flow reading of the differential pressure mass flow controller;
ηmix＝ηmix(mS): viscosity number of the slurry, with respect to mSA function of (a);
ηL: the differential pressure type mass flow controller calibrates the viscosity value of the liquid;
ρmix＝ρmix(mS): density value of the slurry is mSA function of (a);
ρL: the density value of the liquid is calibrated by the differential pressure type mass flow controller;
the precision of the Coriolis mass flow controller is +/-0.5%, the precision of the differential pressure type mass flow controller is +/-0.4%, and the maximum deviation of the slurry solid content detection is less than +/-0.5%. As a further preferred option, the maximum deviation of the slurry solids content measurement is less than. + -. 0.3%.
The measurement and control principle of the coriolis mass flow controller is the same as that of embodiment 1 of the present invention.
As shown in fig. 5, the operating principle of the differential pressure type mass flow controller is as follows: the flow pattern of the fluid flowing in turbulent flow in the pipeline is changed into laminar flow after entering the differential pressure type flowmeter, and the measurement principle of the differential pressure type flowmeter is that a linear relation exists between the flow velocity and the pressure drop when the fluid flows in a flow channel in laminar flow. It can be described by Poiseuille equation:
q＝(P1-P2)πr4/8ηL＝KΔP/η (9)
in the formula, K ═ pi r4/8L (10)
Wherein q is the volumetric flow rate of the fluid; p1Is the static pressure of the fluid at the inlet of the flow channel, P2Is the static pressure of the fluid at the outlet of the flow channel, r is the equivalent radius of the flow channel, η is the absolute viscosity of the fluid, and L is the length of the flow channel.
For a differential pressure flowmeter, the following flow conversion equation exists:
Figure BDA0002531572870000081
in the formula, qDIs a volume flow measurement value of the differential pressure flowmeter based on the calibration fluid ηLIs the viscosity of the calibration fluid and is constant, q is the real volume flow of the fluid, ηmix＝ηmix(mS) Is the viscosity value of the fluid, which is the solid content m of the slurrySAs a function of (c).
The liquid is incompressible fluid, the density of the incompressible fluid is slightly influenced by pressure and is generally ignored, and before and after the liquid passes through the differential pressure type flowmeter, the density of the incompressible fluid can be regarded as a constant, so that the incompressible fluid has the following components:
Figure BDA0002531572870000082
in the formula, QDThe mass flow reading of the differential pressure type flowmeter based on the calibration liquid is taken as the reference; q is the true mass flow of the liquid; rhoLIs the density of the calibration liquid, is a constant; rhomix＝ρmix(mS) Is the density value of the liquid, which is the solid content m of the slurrySAs a function of (c).
From formula (4), there are:
Figure BDA0002531572870000083
viscosity of the slurry η according to the mixing rulemixComprises the following steps:
lnηmix＝xS·lnηS+xW·lnηW(13)
in the formula, xS、xWIs the molar fraction of the slurry and water, ηS、ηWIs the viscosity of the slurry, water. Wherein:
Figure BDA0002531572870000084
Figure BDA0002531572870000085
in the formula, wmixIs the mass of the slurry, MS、MWIs the molar mass of the slurry, water, and, thus,
Figure BDA0002531572870000086
Figure BDA0002531572870000087
according to the molar mass M of the slurry and the waterS、MWAnd viscosity ηS、ηWIs a constant, and mS+m W1, then the viscosity of the slurry ηmixIs the solid content m of the slurrySA function of, i.e.
Figure BDA0002531572870000091
According to the two-liquid theory, the volume of the slurry is:
Figure BDA0002531572870000092
in the formula, VmixIs the volume of the slurry, nS、nWIs the amount of the slurry, water, material, Vm，S、Vm，WIs the molar volume of slurry, water, pS、ρWIs the density of the slurry, water. Thus, the density ρ of the slurrymixComprises the following steps:
Figure BDA0002531572870000093
due to the density rho of the slurry and waterS、ρWIs a constant, and mS+m W1, then, the density of the slurry ρmixIs the solid content m of the slurrySA function of, i.e.
Figure BDA0002531572870000094
The Coriolis mass flow controller is used for controlling the mass flow of the slurry on the solid content rate detection line to be constant, so that the influence of the flow speed (or shearing action) on the viscosity of the non-Newtonian fluid can be eliminated, and the reading ratio of the differential pressure type mass flow controller and the Coriolis mass flow controller is determined by the
Figure BDA0002531572870000095
And (3) calculating the solid content of the slurry by the computer according to the formulas (2), (18) and (21).
The raw materials and equipment used in the invention are common raw materials and equipment in the field if not specified; the methods used in the present invention are conventional in the art unless otherwise specified.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, alterations and equivalents of the above embodiments according to the technical spirit of the present invention are still within the protection scope of the technical solution of the present invention.

Claims (9)

1. An online slurry solid content detection device based on serial connection of mass flow controllers is characterized by comprising a main slurry tank (1) and a preheating slurry tank (2) which are sequentially connected in the flow direction; still be connected with thick liquid circulation line (3) between main thick liquid case and the preheating thick liquid case, be equipped with solid rate detection line (4) that flow direction preheats the thick liquid case on the thick liquid circulation line, it has Coriolis mass flow controller (5) and hot type mass flow controller (6) or differential pressure formula mass flow controller (7) to establish ties in proper order according to the flow direction on the solid rate detection line.
2. The apparatus of claim 1 wherein the coriolis mass flow controller, thermal mass flow controller, and differential pressure mass flow controller are devices having flow measurement and flow conditioning components and a signal transfer component with a response time of less than 0.1 seconds and a lower flow control limit of 0.1 kilograms per hour.
3. The apparatus of claim 1, wherein the thermal mass flow controller is a refrigeration thermal liquid mass flow controller.
4. The apparatus of claim 1, wherein the differential pressure mass flow controller is a V-cone liquid mass flow controller.
5. A method for on-line detecting the solid content of slurry by using the device of any one of claims 1 to 4, which comprises: the slurry overflowing from the main slurry box enters the preheating slurry box and then enters the slurry circulating line, one part of the slurry is conveyed back to the main slurry box, the other part of the slurry is introduced into the solid content detection line, and the slurry enters the preheating slurry box again after sequentially passing through the Coriolis mass flow controller and the thermal mass flow controller or the differential pressure mass flow controller;
the mass flow of the slurry on the solid content detection line is controlled by the Coriolis mass flow controller, and the solid content of the slurry is calculated and determined after the reading ratio of the thermal mass flow controller and the Coriolis mass flow controller or the reading ratio of the differential pressure mass flow controller and the Coriolis mass flow controller is subjected to formula conversion.
6. The method of claim 5, wherein the combination of Coriolis mass flow controllers and thermal mass flow controllers is selected according to the formula:
Figure FDA0002531572860000011
wherein:
QC: a flow reading of the coriolis mass flow controller;
QT: flow readings of a thermal mass flow controller;
mS: solid content of the slurry;
cM: the thermal mass flow controller calibrates the specific heat capacity value of the liquid;
cmix＝cmix(mS): the specific heat capacity value of the slurry is mSA function of (a);
cmix＝mS·cS+(1-mS)·cW＝cmix(mS)
in the formula, cS、cWIs the specific heat capacity of the slurry and water.
7. The method of claim 5 wherein when selecting a combination of a coriolis mass flow controller and a differential pressure mass flow controller, the equation is:
Figure FDA0002531572860000021
wherein:
QD: a flow reading of the differential pressure mass flow controller;
ηmix＝ηmix(mS): viscosity number of the slurry, with respect to mSA function of (a);
ηL: the differential pressure type mass flow controller calibrates the viscosity value of the liquid;
ρmix＝ρmix(mS): density value of the slurry is mSA function of (a);
ρL: the density value of the liquid is calibrated by the differential pressure type mass flow controller;
Figure FDA0002531572860000022
in the formula, ηS、ηWViscosity of the slurry and water respectively; mS、MWThe molar mass of the slurry and the molar mass of the water are respectively;
Figure FDA0002531572860000023
in the formula, ρS、ρWThe density of the slurry and water, respectively.
8. The method of claim 5 wherein the coriolis mass flow controller has a precision of ± 0.5%, the thermal mass flow controller has a precision of ± 0.9%, the differential mass flow controller has a precision of ± 0.4%, and the maximum deviation of the slurry solids content detection is less than ± 0.9%.
9. The method of claim 8, wherein the maximum deviation of the slurry solids detection is less than ± 0.3%.
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