CN110564469B - Polar high-molecular additive for coal water slurry, and preparation method and application thereof - Google Patents
Polar high-molecular additive for coal water slurry, and preparation method and application thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of coal water slurry, and particularly relates to a polar high-molecular type coal water slurry additive, and a preparation method and application thereof, wherein the preparation method comprises the following steps: (1) in a reaction device, mixing a polyacrylic acid solution and a polyethylene glycol solution, adding concentrated sulfuric acid, and reacting to obtain a polymer mixed solution; the reaction device is provided with a polarized electrode and a closed current coil strip; (2) starting a polarizing electrode and boosting pressure, and then polarizing the polymer mixed solution; adding a fluorination reinforcing agent in the process to obtain a fluorinated polar polymer mixed solution; (3) and electrifying the current coil strip to act on the polar polymer mixed solution, obtaining the solution at the side of the molecular motion direction and adjusting the pH value of the solution to obtain the coal water slurry additive solution. The obtained coal water slurry additive can effectively improve the concentration and the performance of the coal water slurry and thoroughly solve the problems of agglomeration, sedimentation and the like in pipelines in the long-term storage and long-distance conveying processes of the coal water slurry.
Description
Technical Field
The invention belongs to the technical field of coal water slurry, and particularly relates to a polar high-molecular type coal water slurry additive as well as a preparation method and application thereof.
Background
Coal water slurry gasification is one of clean coal technologies which have emerged in the eighties of the last century, and coal, water and a small amount of chemical additives are adopted to prepare the coal water slurry which is then fed into a gasification furnace for reaction to generate CO and H2For industrial use. The coal water slurry with good performance has the characteristics of high concentration, low viscosity, good fluidity and long stabilization time. The lower the viscosity of the coal water slurry is under the same condition, the better the fluidity of the coal water slurry is, the higher the concentration of the coal water slurry can be formed, and the lower the gasification unit consumption is.
However, non-polar coal particles are dispersed in polar water and belong to thermodynamically unstable systems. Generally, the performance of coal slurry is improved by adding a coal water slurry additive, coal particles can be uniformly dispersed in a water mobile phase by adding the coal water slurry additive, and the fluidity and the stability of the coal slurry are improved. Common coal water slurry additives comprise lignosulfonic acid systems, naphthalene systems, humic acid systems and nonionic systems, which are all surfactants and can only play a role in static dispersion; for the condition of long-time placement or long-distance transportation, along with the extension of the placement time or the extension of the transportation distance, the coal water slurry is easy to settle and block pipelines and equipment, so that the normal use and operation cannot be realized.
Patent document CN106118764A discloses a lignosulfonate brine coal slurry additive, which mainly comprises naphthalene water reducing agent, sodium silicate, lignosulfonate and the like, is still a traditional lignosulfonate-naphthalene additive, belongs to static mixing distribution, and has the problems of slurry layering and the like after being placed for a long time.
The coal water slurry additive disclosed in patent document CN103232869A is mainly prepared from sodium tripolyphosphate, polyethylene glycol, and maleic acid-methacrylic acid copolymer sodium salt, and can meet the requirements of slurry concentration being greater than or equal to 58% and viscosity being less than 1200mPa · s. However, the patent mainly aims to solve the problem of industrial wastewater/concentrated water recycling, and does not mainly aim at high-concentration coal slurry, and the slurry concentration of the coal water slurry disclosed by the patent is relatively low (about 58%).
Patent document CN105695001A discloses a tar type coal water slurry additive, which is prepared by using wash oil, naphthalene oil, anthracene oil and papermaking waste liquid as main raw materials through methods of sulfonation, condensation and the like, aiming at the characteristics of developed surface voids and strong hydrophilicity of low-rank coal. But the slurry is in static mixing distribution, and the slurry can be layered after being placed for a long time.
Although the above patent documents use different methods to prepare the coal water slurry additive, they fail to effectively improve the uniform distribution of raw coal particles in water under the conditions of long-term storage or long-distance transportation, etc., and fail to effectively increase the concentration of coal slurry, and also fail to solve the problems of agglomeration and sedimentation existing in long-term storage of coal slurry.
Disclosure of Invention
The invention aims to provide a preparation method of a polar high-molecular type coal water slurry additive and application thereof, aiming at the problem that the traditional coal water slurry additive can not realize long-period storage or long-distance transportation of the coal water slurry.
In order to achieve the above purpose, the invention provides the following technical scheme:
in one aspect of the invention, the preparation method of the polar polymer type coal water slurry additive comprises the following steps:
1) mixing polyacrylic acid solution and polyethylene glycol solution in a reaction device, adding concentrated sulfuric acid (the concentration is 98 wt%) in the mixing process, and reacting to obtain mixed solution containing high molecular polymer;
the reaction device is provided with a polarized electrode 3 and a closed current coil strip 4, and the connecting line direction of the positive electrode and the negative electrode of the polarized electrode is parallel to the current direction of the current coil strip;
2) opening the polarizing electrode 3 and increasing the pressure to 500-1000V (e.g., 550V, 650V, 700V, 800V, 900V), preferably 600-1000V, and then maintaining for 30-60min (e.g., 40min, 50min, 55min) to perform polarization treatment on the mixed solution containing the high molecular polymer obtained in the reaction device; adding a fluorination reinforcing agent in the polarization treatment process to perform fluorination reinforcement to obtain a fluorinated mixed solution containing the polar high molecular polymer;
3) electrifying the current coil 4, keeping the current coil for 30-60min (for example, 40min, 50min, 55min), and acting on the obtained mixed solution containing the polar high molecular polymer to obtain a solution on the side of the molecular motion direction; and then adjusting the pH value of the solution on the side of the molecular motion direction to 8-10 (for example, 8.5, 9 and 9.5), thus obtaining the polar polymer type coal water slurry additive solution.
According to the preparation method provided by the invention, in some examples, the concentration of the polar high molecular type coal water slurry additive solution is 10-50 wt% (e.g., 15 wt%, 20 wt%, 25 wt%, 30 wt%, 35 wt%, 40 wt%, 45 wt%), and the polar high molecular type coal water slurry additive solution can be obtained by adding water to the reaction system for dilution or heating and concentrating.
The reactor according to the present invention may be selected from horizontally arranged cylindrical reactors, for example, horizontal cylindrical reactors, tubular reactors.
According to the preparation method provided by the invention, in some preferred embodiments, the reaction device is a horizontal cylindrical reactor, and comprises a reactor barrel 1 and two reactor end faces 5 connected with the left end and the right end of the barrel; the horizontal cylindrical reactor has a length to diameter ratio of 3 to 8 (e.g., 4, 5, 6, 7), more preferably 5 to 8.
Preferably, the polarizing electrodes 3 are respectively arranged on the inner walls of the two reactor end faces 5 in the horizontal cylindrical reactor. The polarizing electrodes may be selected from positively charged polarizing electrodes and/or negatively charged polarizing electrodes, for example, polarizing electrodes having opposite electrode polarities are respectively disposed on the left end wall and the right end wall of a horizontal cylindrical reactor to constitute a group of polarizing electrodes. Here, the arrangement of the polarizing electrodes and the specific operation of the polarizing process are well known to those skilled in the art and will not be described in detail here. The relevant devices and equipment capable of providing the required voltage in the process of carrying out the polarization treatment on the mixed solution containing the high molecular polymer in the reaction device through the polarization electrode are all conventional operations in the field.
Preferably, a plurality of groups of the current coil strips are wound on the outer wall of the horizontal cylindrical reactor, and the direction of the positive and negative connecting lines of the polarized electrode is parallel to the current direction of the current coil strips. More preferably, each group of the current coil bars is wound in a manner that: the current coil strips are extended over the outer wall of the reactor barrel 1 and over the outer walls of the two reactor end faces 5 connected to the barrel, so that they form a closed coil.
Preferably, the distance between two adjacent groups of the current coil strips is equal on the outer wall of the reactor barrel 1.
In some examples, the number of current coil bars is 4-16 groups (e.g., 6 groups, 10 groups, 12 groups, 14 groups), preferably 8-16 groups. For example, when the current coil strips are provided in multiple groups, each group is a closed-loop current coil strip with the same specification.
By arranging the current coil strip on the reaction device, the current provided when the reaction device is electrified can generate a magnetic field; under the condition of the generated magnetic field, the obtained fluorinated mixed solution containing the polar high molecular polymer can generate displacement and relative motion under the action of the magnetic field, namely the solution on the side of the molecular motion direction can be obtained according to Maxwell's law. The operation of applying current to the current coil strip is conventional in the art, and the required related devices can be implemented by conventional equipment in the art, and are not described herein again.
According to the preparation method provided by the invention, preferably, in the step 1), the mixing time is 2-4h (for example, 2.5h, 3h, 3.5 h); during the mixing, the mass of concentrated sulfuric acid added every 30 to 60min is 1 to 10 wt% (e.g., 2 wt%, 5 wt%, 8 wt%) of the mass of polyacrylic acid.
In some examples, the mass ratio of polyacrylic acid to polyethylene glycol is 20/80-40/60 (e.g., 25/75, 30/70, 35/65) based on the total amount of polyacrylic acid and polyethylene glycol (e.g., 100 total mass).
In some examples, the polyacrylic acid solution has a concentration of 10 to 30 wt% (e.g., 15 wt%, 20 wt%, 25 wt%), preferably 12 to 20 wt%; the polyacrylic acid has a number average molecular weight of 800-.
In some examples, the concentration of the polyethylene glycol solution is 10-30 wt% (e.g., 15 wt%, 20 wt%, 25 wt%), preferably 10-15 wt%; the number average molecular weight of the polyethylene glycol is 400-.
In some examples, the solvent in the polyacrylic acid solution and/or polyethylene glycol solution is selected from one or more of water, ethanol, acetone, and isopropanol. For example, the solvent in the polyacrylic acid solution may be selected from one or more of water, ethanol, acetone, and isopropanol; the solvent in the polyethylene glycol solution can also be selected from one or more of water, ethanol, acetone and isopropanol.
According to the preparation method provided by the invention, preferably, in the step 2), the pressure increasing rate of the pressure increasing is 10-100V/min (for example, 20V/min, 40V/min, 70V/min), and preferably 50-80V/min.
Preferably, during said poling treatment of step 2), the mass of fluorinated reinforcing agent added every 10-20min is 20-40 wt% of the mass of polyacrylic acid.
In some examples, in step 2), the fluorinated reinforcing agent is a difluorocarbene reagent (e.g., a compound that can release a difluorocarbene intermediate).
In some preferred embodiments, the difluorocarbene reagent is selected from difluoromethylenephosphonium inner salts and/or difluorophosphonium acetates, more preferably difluorophosphonium acetates. For example, the phosphonium difluoroacetate inner salt (Ph)3P+CF2CO2 -PDFA) not only act as Wittig-type difluoroalkenylation reagent but also as a highly efficient difluorocarbene reagent. Unlike most difluorocarbene reagents in the past, difluorocarbene reagents used in the present invention, e.g., Ph, do not require the addition of any additives or bases3P+CF2CO2 -The difluorocarbene can be released under the reaction system.
By adding the difluorocarbene reagent into the reaction system, the difluorocarbene intermediate released by the difluorocarbene reagent can perform fluorination reinforcement on the polarized high molecular polymer.
According to the preparation method provided by the invention, preferably, in the step 3), the output frequency of the current coil strip is 20-120HZ (for example, 50HZ, 80HZ, 100HZ), and the current passed through the current coil strip is 5-20A (for example, 8A, 12A, 15A), preferably 10-20A.
In some examples, step 3) the pH of the solution is adjusted by adding water, ammonia, and a co-solvent. In the process of adjusting the pH of the solution, water can play a role in diluting the ammonia water and the cosolvent. In some examples, the co-solvent is selected from one or more of methanol, ethanol, n-propanol, isopropanol, and ethylene glycol.
In the invention, the current coil strip arranged on the reaction device forms a magnetic field after being electrified, and the direction of the magnetic field can be determined to be perpendicular to the direction of the coil strip (or the direction of current in the coil strip) according to the right-hand ampere law. In step 3), the obtained mixed solution containing the polar high molecular polymer is placed in the magnetic field environment, the polar high molecular polymer contained in the mixed solution can displace under the action of a magnetic field, and the direction of the displacement can be determined as the direction pointed by the thumb according to the left-hand rule. Therefore, the "molecular motion direction side" appearing in the solution on the molecular motion direction side refers to the side of the "direction of displacement" as described above. The solution on the side of the "direction of displacement", that is, the solution on the side of the direction of molecular motion.
In the present invention, after the solution on the side of the molecular movement direction is obtained by step 3), it can be extracted for use by an operation familiar to those skilled in the art; for example, the solution on the side of the direction of molecular motion is extracted by a syringe for use.
In another aspect of the present invention, there is provided a polar polymer type coal water slurry additive prepared by the above preparation method.
The apparent viscosity of the polar polymer type coal water slurry additive can meet the conveying requirement, for example, the apparent viscosity at 25 ℃ is within 1000mPa & s; the dielectric constant is high, for example, up to 10-20.
In another aspect of the present invention, there is provided a use of a polar polymer type coal water slurry additive, comprising the steps of:
uniformly mixing the polar high-molecular water-coal-slurry additive solution with water and coal to prepare water-coal-slurry; and the obtained coal water slurry is put into a coal slurry conveying pipeline with a magnetizing coil for use. The polar polymer type coal water slurry additive is the polar polymer type coal water slurry additive or the polar polymer type coal water slurry additive prepared by the preparation method.
In some examples, the ratio of the dry mass of the polar polymeric water-coal-slurry additive solution to the dry mass of the coal of the water-coal-slurry is 0.2 to 1 wt% (e.g., 0.3 wt%, 0.5 wt%, 0.7 wt%, 0.9 wt%).
For example, the polar polymer type coal-water slurry additive obtained by the present invention is used according to the above-mentioned application. Taking bituminous coal/sub-bituminous coal as an example, uniformly mixing polar high molecular type coal water slurry additive solution with water and coal, wherein when the concentration of the coal water slurry reaches 66-70 wt%, the apparent viscosity of the coal slurry is 800 +/-100 mPa.s; the obtained coal water slurry is placed in a coal slurry conveying pipeline with a magnetizing coil, no agglomeration and sedimentation occur, and the long-distance pipeline conveying like petroleum can be met. Also, the phenomenon of agglomeration and sedimentation can not occur in the long-term storage process.
The invention can shift the charge of the synthesized polymer compound through the additional polarized electrode, thereby forming the polar polymer compound; and then, a formed polar high molecular compound is subjected to fluorination reinforcement by a fluorination reinforcing agent (for example, difluorophosphonium acetate inner salt), so that the high molecular compound can obtain permanent polarity, and meanwhile, the stability of polyethylene glycol side chains in the high molecular compound on a polyacrylic acid main chain is reinforced, so that the opening angle of the side chains is larger, a coal water slurry system can be stirred under the action of an external magnetic field better, and finally, the coal water slurry can be effectively prevented from agglomerating and settling in the long-term storage or long-distance conveying process, and the requirements of long-term storage or long-distance pipeline conveying can be met while the concentration of the coal water slurry is improved.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
(1) the invention can shift the charge of the synthesized macromolecular compound by adding the polarizing electrode, and then can reinforce the polarity and the stability of the polyethylene glycol side chain on the polyacrylic acid main chain by using the fluorinated reinforcing agent (such as difluoro phosphonium acetate inner salt), so that the dielectric constant of the prepared coal water slurry additive is kept at a higher level.
(2) When the polar polymer type coal water slurry additive obtained after polarization and reinforcement is used in a coal water slurry system, the aggregation and sedimentation of the coal water slurry in the long-term storage process can be effectively prevented under the action of an external magnetic field, the concentration of the coal water slurry is improved, and the requirement of long-distance pipeline transportation is met.
Drawings
FIG. 1 is a front view of a horizontal cylindrical reactor according to one embodiment of the present invention.
FIG. 2 is a front view of a horizontal cylindrical reactor in example 2.
FIG. 3 is a sectional view of a horizontal cylindrical reactor taken along the line A-A in example 2.
In the figure, 1-reactor cylinder, 2-reactor charging port, 3-polarized electrode, 3-1-polarized electrode a, 3-2-polarized electrode b, 4-current coil bar, 4-1-first current coil bar, 4-2-second current coil bar, 4-3-third current coil bar, 4-fourth current coil bar, 4-5-fifth current coil bar, 4-6-sixth current coil bar, 4-7-seventh current coil bar, 4-8-eighth current coil bar, 5-reactor end face, 5-1-reactor left end face, 5-2-reactor right end face.
Detailed Description
In order that the technical features and contents of the present invention can be understood in detail, preferred embodiments of the present invention will be described in more detail below. While the preferred embodiments of the present invention have been described in the examples, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein.
< sources of raw materials >
Polyacrylic acid (number average molecular weight of 600), national drug group chemical;
polyacrylic acid (number average molecular weight of 800), national drug group chemical;
polyacrylic acid (number average molecular weight 4000), a national drug group chemical;
polyacrylic acid (number average molecular weight of 6000), national drug group chemical;
polyacrylic acid (number average molecular weight 8000), a national drug group chemical;
polyethylene glycol (number average molecular weight 400), a national drug group chemical;
polyethylene glycol (number average molecular weight 1200), a national drug group chemical;
polyethylene glycol (number average molecular weight 2000), a national group chemical;
polyethylene glycol (number average molecular weight of 6000), national medicine group chemical reagent;
polyethylene glycol (number average molecular weight 8000), national medicine group chemical reagent;
phosphonium difluoroacetate inner salt, shanghai organic institute;
ammonia water, chemical reagents of national medicine group;
methanol, chemical reagents of national drug group;
coal powder, Shenhua group Shenyou No. 2 coal sample.
< detection method >
The following test methods were used in the examples and comparative examples of the present invention:
indexes such as concentration, viscosity, fluidity and the like of the coal water slurry and detection methods are carried out according to GB-/T18855-2008.
A dielectric constant detector: model BI-870 (Bruk, USA).
A viscometer: model NXS-4C (national center for the development of coal-water slurry engineering technology).
Quick moisture meter: model M35M (sydows scientific instruments (beijing) ltd).
In one example, the reaction device used in the preparation method of the polar high molecular type coal water slurry additive is a horizontal cylindrical reactor, as shown in figure 1. Wherein, every group the winding mode of electric current coil strip does: the current coil strip firstly extends to a reactor end face connected with one end of the barrel along the direction of the transverse shaft of the barrel on the outer wall of the reactor barrel 1, then extends to the radial terminal along the radial direction on the outer wall of the end face, then extends to the reactor end face connected with the other end of the barrel along the direction of the transverse shaft of the barrel on the outer wall of the reactor barrel 1 by taking the terminal as a starting point, and then extends to the radial terminal along the radial direction on the outer wall of the end face, and finally forms a closed coil.
Specifically, as shown in the schematic structural diagrams of fig. 2 and 3, taking the fifth current coil strip 4-5 as an example, the winding manner is as follows: the starting end of a fifth current coil strip 4-5 is placed on the leftmost side of the outer wall of the reactor barrel 1, and then the current coil strip extends to the rightmost end of the barrel along the direction of the transverse shaft of the barrel on the outer wall of the reactor barrel 1; then the current coil strip vertically extends downwards to the right end face 5-2 of the reactor connected with the cylinder body, and extends to the radial terminal along the radial direction on the outer wall of the right end face; then the current coil strip vertically downwards reaches a cylinder body connected with the right end surface 5-2 of the reactor, and then extends to the leftmost end of the cylinder body along the direction of the cross shaft of the cylinder body on the outer wall of the cylinder body 1 of the reactor; then the current coil strip vertically extends upwards to the left end face 5-1 of the reactor connected with the cylinder body, and extends to the radial terminal end along the radial direction on the outer wall of the left end face, and the starting point and the terminal point of the winding of the current coil strip coincide, so that a complete closed current coil is formed.
In one embodiment, the reaction device used in the preparation method of the polar polymer type coal water slurry additive is a horizontal cylindrical reactor, as shown in fig. 2 and 3. Adding the materials into a reactor barrel 1 through a feed inlet 2 of the reactor, and stirring; after the reaction in the step 1) is finished, opening a polarized electrode a 3-1 positioned on the left end face 5-1 of the reactor and a polarized electrode b 3-2 positioned on the right end face 5-2 of the reactor, forming a strong electric field in the reactor, carrying out polarization treatment on the obtained mixed liquid containing the high molecular polymer, and simultaneously adding a fluorination reinforcing agent for fluorination fixation. After the polarization and fluorination in the step 2) are solidified, introducing current to eight groups of current coil strips (respectively comprising a first current coil strip 4-1, a second current coil strip 4-2, a third current coil strip 4-3, a fourth current coil strip 4-4, a fifth current coil strip 4-5, a sixth current coil strip 4-6, a seventh current coil strip 4-7 and an eighth current coil strip 4-8) on the reactor barrel 1, wherein each group of current coil strips can form a closed loop and generate a magnetic field which is perpendicular to the current coil strips (or the current direction thereof); according to the change condition of alternating current, a changing magnetic field space can be generated in the reactor, the fluorinated polar high-molecular polymer in the mixed liquid can be displaced and deflected in the changing magnetic field and moves towards the direction pointed by the thumb according to the left-hand rule, and finally the solution on the side of the molecular movement direction is obtained, namely the polar high-molecular water-coal-slurry additive solution.
In the present invention, the preparation of the polar high molecular type coal water slurry additive can be realized by selecting the length of the horizontal cylindrical reactor to be 0.1-5m, for example, but the length range is not limited thereto.
Example 1
In the preparation method of the polar polymer type coal water slurry additive, the reaction device is a horizontal cylindrical reactor, and the structural schematic diagrams shown in fig. 2 and fig. 3 can be referred, but the difference is that the length-diameter ratio is 3 (wherein, the length of the reactor is 90cm), 4 groups of current coil strips are placed, and the connecting line directions of the anode and the cathode of the polarized electrode are parallel to the current direction of the current coil strips.
(1) An aqueous solution of polyacrylic acid (number average molecular weight 800) having a concentration of 10% by weight was placed in a horizontally placed cylindrical reactor. Adding 10 wt% polyethylene glycol (number average molecular weight of 400) water solution into polyacrylic acid solution, and stirring for 3 h; in the stirring process, the mass of concentrated sulfuric acid added every 30min is 1 wt% of polyacrylic acid, and mixed liquor containing high molecular polymers is obtained after reaction. In the reaction system, the mass ratio of polyacrylic acid to polyethylene glycol added was 20/80.
(2) Starting a power supply connected with the polarized electrodes at the left end and the right end of the cylindrical reactor, setting a transformer boosting program to boost the voltage to 500V at a boosting rate of 10V/min, and then keeping for 30min to carry out polarization treatment on the mixed liquid containing the high molecular polymer obtained in the reactor; in the process of the polarization treatment, the mass of the difluorophosphonium acetate inner salt is 20 wt% of that of polyacrylic acid every 10min, so as to perform fluorination reinforcement on the polarized or polarizing high molecular compound, and obtain a fluorinated polar high molecular mixed solution.
(3) And (2) introducing current into a current coil strip on the outer side wall of the cylindrical reactor through conventional voltage equipment, setting the output frequency of a variable frequency transformer to be 20HZ and the current to be 5A, keeping the frequency for 30min to act on the obtained mixed liquid containing the polar high molecular polymer, and obtaining the solution on the side of the molecular motion direction according to the Maxwell's law. And extracting the solution on the side of the molecular motion direction by using an injector, and adjusting the pH to 8 by adding water, ammonia water and methanol, wherein the concentration of the finally prepared polar macromolecular water-coal-slurry additive solution is ensured to be 10 wt%.
The dielectric constant of the prepared coal water slurry additive is detected to be 13.5 by using a dielectric constant detector.
Preparing the coal water slurry: taking 74.7g of coal powder and 0.2g (dry basis mass) of the prepared coal water slurry additive, adding water to dilute the coal powder and the prepared coal water slurry additive to 100g, and uniformly stirring the mixture to obtain the flowable coal water slurry.
And (3) detecting the fluidity B according to a standard method, determining the apparent viscosity of the coal water slurry at 25 ℃ to be 801mPa & s by using a viscometer, and determining the concentration of the coal water slurry to be 63.5 wt% by using a rapid moisture meter.
The prepared coal water slurry is placed in a coal slurry conveying pipeline with a magnetizing coil (the voltage of the coal water slurry is 220V/current of the coal water slurry is 13A), and after 72 hours, the apparent viscosity of the coal water slurry in the pipeline is retested to be 811mPa & s at 25 ℃ by using a viscometer.
Example 2
In the preparation method of the polar polymer type coal water slurry additive, the reaction device is a horizontal cylindrical reactor, and the structure schematic diagrams are shown in figure 2 and figure 3. The length-diameter ratio of the reactor is 4 (wherein, the length of the reactor is 90cm), 8 groups of current coil strips are placed, and the connecting line direction of the positive electrode and the negative electrode of the polarized electrode is parallel to the current direction of the current coil strips.
(1) An aqueous solution of polyacrylic acid (number average molecular weight 4000) having a concentration of 12% by weight was placed in a horizontally placed cylindrical reactor. Adding a 15 wt% polyethylene glycol (number average molecular weight of 1200) aqueous solution into the polyacrylic acid solution, and stirring for 2 h; in the stirring process, the mass of concentrated sulfuric acid added every 50min is 5 wt% of polyacrylic acid, and mixed liquor containing high molecular polymer is obtained after reaction. In the reaction system, the mass ratio of polyacrylic acid to polyethylene glycol added was 30/70.
(2) Starting a power supply connected with the polarizing electrodes at the left end and the right end of the cylindrical reactor, setting a transformer boosting program to boost the voltage to 600V at a boosting rate of 100V/min, and then keeping for 45min to carry out polarization treatment on the mixed liquid containing the high molecular polymer obtained in the reactor; in the process of the polarization treatment, the mass of the difluorophosphonium acetate inner salt is 30 wt% of that of polyacrylic acid every 15min, so as to perform fluorination reinforcement on the polarized or polarizing high molecular compound, and obtain the fluorinated mixed solution containing the polar high molecular polymer.
(3) And (2) introducing current into a current coil strip on the outer side wall of the cylindrical reactor through conventional voltage equipment, setting the output frequency of a variable frequency transformer to be 60HZ and the current to be 10A, keeping the frequency for 40min to act on the obtained mixed liquid containing the polar high molecular polymer, and obtaining the solution on the side of the molecular motion direction according to the Maxwell's law. Extracting the solution on the side of the molecular motion direction by using an injector, and adjusting the pH to 9 by adding water, ammonia water and ethanol, wherein the concentration of the finally prepared polar macromolecular water-coal-slurry additive solution is ensured to be 50 wt%.
The dielectric constant of the prepared coal water slurry additive is detected to be 12.7 by using a dielectric constant detector.
Preparing the coal water slurry: taking 74.2g of coal powder and 0.2g (dry basis mass) of the prepared coal water slurry additive, adding water to dilute the coal powder and the prepared coal water slurry additive to 100g, and uniformly stirring the mixture to obtain the flowable coal water slurry.
The fluidity is A-detected according to a standard method, the apparent viscosity of the coal water slurry at 25 ℃ is 859mPa & s measured by a viscometer, and the concentration of the coal water slurry is 63.1 wt% measured by a rapid moisture meter.
The prepared coal water slurry is placed in a coal slurry conveying pipeline with a magnetizing coil (the voltage of the magnetizing coil is 220V/current of the magnetizing coil is 13A), and after 72 hours, the apparent viscosity of the coal water slurry in the pipeline is retested to be 716mPa & s at 25 ℃ by using a viscometer.
Example 3
In the preparation method of the polar polymer type coal water slurry additive, the reaction device is a horizontal cylindrical reactor, and the structural schematic diagrams shown in fig. 2 and fig. 3 can be referred, but the difference is that the length-diameter ratio is 5 (wherein, the length of the reactor is 90cm), 12 groups of current coil strips are placed, and the connecting line directions of the anode and the cathode of the polarized electrode are parallel to the current direction of the current coil strips.
(1) An aqueous solution of polyacrylic acid (number average molecular weight 6000) having a concentration of 16% by weight was placed in a horizontally placed cylindrical glass reactor. Adding 30 wt% polyethylene glycol (number average molecular weight 2000) water solution into polyacrylic acid solution, and stirring for 4 h; in the stirring process, the mass of concentrated sulfuric acid added every 60min is 5 wt% of polyacrylic acid, and mixed liquor containing high molecular polymer is obtained after reaction. In the reaction system, the mass ratio of polyacrylic acid to polyethylene glycol added was 40/60.
(2) Starting a power supply connected with the polarized electrodes at the left end and the right end of the cylindrical reactor, setting a transformer boosting program to boost the voltage to 800V at a boosting rate of 50V/min, and then keeping for 60min to carry out polarization treatment on the mixed liquid containing the high molecular polymer obtained in the reactor; in the process of the polarization treatment, the mass of the difluorophosphonium acetate inner salt is 30 wt% of that of polyacrylic acid every 20min, so as to perform fluorination reinforcement on the polarized or polarizing high molecular compound, and obtain the fluorinated mixed solution containing the polar high molecular polymer.
(3) And (2) introducing current into a current coil strip on the outer side wall of the cylindrical reactor through conventional voltage equipment, setting the output frequency of a variable frequency transformer to be 70HZ and the current to be 20A, keeping the frequency for 50min to act on the obtained polar polymer mixed liquid, and obtaining the solution on the side of the molecular motion direction according to the Maxwell's law. Extracting the solution on the side of the molecular motion direction by using an injector, and adjusting the pH to 10 by adding water, ammonia water and ethylene glycol, wherein the concentration of the finally prepared polar macromolecular water-coal-slurry additive solution is ensured to be 30 wt%.
The dielectric constant of the prepared coal water slurry additive is detected to be 15.6 by using a dielectric constant detector.
Preparing the coal water slurry: taking 76.1g of coal powder and 0.2g (dry basis mass) of the prepared coal water slurry additive, adding water to dilute the coal powder and the prepared coal water slurry additive to 100g, and uniformly stirring the mixture to obtain the flowable coal water slurry.
And (3) detecting that the fluidity is B + according to a standard method, determining that the apparent viscosity of the coal water slurry is 816mPa & s at 25 ℃ by using a viscometer, and determining that the concentration of the coal water slurry is 64.7 wt% by using a rapid moisture meter.
The prepared coal water slurry is placed in a coal slurry conveying pipeline with a magnetizing coil (the voltage of the magnetizing coil is 220V/current of the magnetizing coil is 13A), and after 72 hours, the apparent viscosity of the coal water slurry in the pipeline is retested to be 864mPa & s at 25 ℃ by using a viscometer.
Example 4
In the preparation method of the polar polymer type coal water slurry additive, the reaction device is a horizontal cylindrical reactor, and the structural schematic diagrams shown in fig. 2 and fig. 3 can be referred, but the difference is that the length-diameter ratio is 6 (wherein, the length of the reactor is 90cm), 8 groups of current coil strips are placed, and the connecting line directions of the anode and the cathode of the polarized electrode are parallel to the current direction of the current coil strips.
(1) An aqueous solution of polyacrylic acid (number average molecular weight 8000) having a concentration of 20% by weight was placed in a horizontally placed cylindrical glass reactor. Adding a polyethylene glycol (with the number average molecular weight of 6000) water solution with the concentration of 12 wt% into the polyacrylic acid solution, and stirring for 4 hours; in the stirring process, the mass of concentrated sulfuric acid added every 30min is 10 wt% of polyacrylic acid, and mixed liquor containing high molecular polymers is obtained after reaction. In the reaction system, the mass ratio of polyacrylic acid to polyethylene glycol added was 30/70.
(2) Starting a power supply connected with the polarized electrodes at the left end and the right end of the cylindrical reactor, setting a transformer boosting program to boost the voltage to 900V at a boosting rate of 70V/min, and then keeping for 60min to carry out polarization treatment on the mixed liquid containing the high molecular polymer obtained in the reactor; in the process of the polarization treatment, the mass of the difluorophosphonium acetate inner salt is 20 wt% of that of polyacrylic acid every 10min, so as to perform fluorination reinforcement on the polarized or polarizing high molecular compound, and obtain a fluorinated polar high molecular mixed solution.
(3) And (2) introducing current into a current coil strip on the outer side wall of the cylindrical reactor through conventional voltage equipment, setting the output frequency of a variable frequency transformer to be 100HZ and the current to be 15A, keeping the frequency for 60min to act on the obtained mixed liquid containing the polar high molecular polymer, and obtaining the solution on the side of the molecular motion direction according to the Maxwell's law. Extracting the solution on the side of the molecular motion direction by using an injector, and adjusting the pH to 8 by adding water, ammonia water and n-propanol, wherein the concentration of the finally prepared polar macromolecular water-coal-slurry additive solution is ensured to be 20 wt%.
The dielectric constant of the prepared coal water slurry additive is detected to be 16.9 by using a dielectric constant detector.
Preparing the coal water slurry: 77.5g of coal powder and 0.2g (dry basis mass) of the prepared coal water slurry additive are taken, water is added to dilute the coal water slurry additive to 100g, and the mixture is stirred uniformly to prepare the flowable coal water slurry.
And (3) detecting the fluidity B according to a standard method, determining the apparent viscosity of the coal water slurry at 25 ℃ to be 755mPa & s by using a viscometer, and determining the concentration of the coal water slurry to be 65.9 wt% by using a rapid moisture meter.
The prepared coal water slurry is placed in a coal slurry conveying pipeline with a magnetizing coil (the voltage of the magnetizing coil is 220V/current of the magnetizing coil is 13A), and after 72 hours, the apparent viscosity of the coal water slurry in the pipeline is retested to be 772mPa & s at 25 ℃ by using a viscometer.
Example 5
In the preparation method of the polar polymer type coal water slurry additive, the reaction device is a horizontal cylindrical reactor, and the structural schematic diagrams shown in fig. 2 and fig. 3 can be referred, but the difference is that the length-diameter ratio is 8 (wherein, the length of the reactor is 90cm), 16 groups of current coil strips are placed, and the connecting line directions of the anode and the cathode of the polarized electrode are parallel to the current direction of the current coil strips.
(1) An aqueous solution of polyacrylic acid (number average molecular weight 4000) having a concentration of 30% by weight was placed in a horizontally placed cylindrical glass reactor. Adding a 15 wt% polyethylene glycol (number average molecular weight of 2000) aqueous solution into the polyacrylic acid solution, and stirring for 3 hours; in the stirring process, the mass of concentrated sulfuric acid added every 40min is 8 wt% of polyacrylic acid, and mixed liquor containing high molecular polymers is obtained after reaction. In the reaction system, the mass ratio of polyacrylic acid to polyethylene glycol added was 40/60.
(2) Starting a power supply connected with the polarized electrodes at the left end and the right end of the cylindrical reactor, setting a transformer to boost the voltage to 1000V at a boosting rate of 80V/min, and then keeping for 50min to carry out polarization treatment on the mixed liquid containing the high molecular polymer obtained in the reactor; in the process of the polarization treatment, the mass of the difluorophosphonium acetate inner salt is 40 wt% of that of polyacrylic acid every 15min, so as to perform fluorination reinforcement on the polarized or polarizing high molecular compound, and obtain the fluorinated mixed solution containing the polar high molecular polymer.
(3) And (2) introducing current into a current coil strip on the outer side wall of the cylindrical reactor through conventional voltage equipment, setting the output frequency of a variable frequency transformer to be 120HZ and the current to be 10A, keeping the frequency for 50min to act on the obtained mixed liquid containing the polar high molecular polymer, and obtaining the solution on the side of the molecular motion direction according to the Maxwell's law. Extracting the solution on the side of the molecular motion direction by using an injector, and adjusting the pH to 10 by adding water, ammonia water and isopropanol to ensure that the concentration of the finally prepared polar macromolecular water-coal-slurry additive solution is 40 wt%.
The dielectric constant of the prepared coal water slurry additive is 18.9 by using a dielectric constant detector.
Preparing the coal water slurry: taking 78.5g of coal powder and 0.2g (dry basis mass) of the prepared coal water slurry additive, adding water to dilute the coal powder and the prepared coal water slurry additive to 100g, and uniformly stirring the mixture to obtain the flowable coal water slurry.
And (3) detecting the fluidity A according to a standard method, determining the apparent viscosity of the coal water slurry at 25 ℃ to be 768mPa & s by using a viscometer, and determining the concentration of the coal water slurry to be 66.7 wt% by using a rapid moisture meter.
The prepared coal water slurry is placed in a coal slurry conveying pipeline with a magnetizing coil (the voltage of the coal water slurry is 220V/current of 13A), and after 72 hours, the apparent viscosity of the coal water slurry in the pipeline is retested to be 791mPa & s at 25 ℃ by using a viscometer.
Comparative example 1
In the preparation method of the polar polymer type coal water slurry additive, the reaction device is a horizontal cylindrical reactor, and the structural schematic diagrams shown in fig. 2 and fig. 3 can be referred, but the difference is that the length-diameter ratio is 5 (wherein, the length of the reactor is 90cm), 12 groups of current coil strips are placed, and the connecting line directions of the anode and the cathode of the polarized electrode are parallel to the current direction of the current coil strips.
(1) An aqueous solution of polyacrylic acid (number average molecular weight 6000) having a concentration of 16% by weight was placed in a horizontally placed cylindrical glass reactor. Adding 30 wt% polyethylene glycol (number average molecular weight 2000) water solution into polyacrylic acid solution, and stirring for 4 h; in the stirring process, the mass of concentrated sulfuric acid added every 60min is 5 wt% of polyacrylic acid, and mixed liquor containing high molecular polymer is obtained after reaction. In the reaction system, the mass ratio of polyacrylic acid to polyethylene glycol added was 40/60.
(2) Starting a power supply connected with the polarizing electrodes at the left end and the right end of the cylindrical reactor, setting a transformer boosting program to boost the voltage to 800V at a boosting rate of 50V/min, and then keeping for 50min to carry out polarization treatment on the mixed liquid containing the high molecular polymer obtained in the reactor; in the process of the polarization treatment, adding hydrogen fluoride, wherein the mass of the hydrogen fluoride added every 20min is 40 wt% of that of polyacrylic acid, so as to perform fluorination reinforcement on the polarized or polarizing high molecular compound, and obtain the fluorinated mixed solution containing the polar high molecular polymer.
(3) And (2) introducing current into a current coil strip on the outer side wall of the cylindrical reactor through conventional voltage equipment, setting the output frequency of a variable frequency transformer to be 70HZ and the current to be 20A, keeping the frequency for 50min to act on the obtained mixed liquid containing the polar high molecular polymer, and obtaining the solution on the side of the molecular motion direction according to the Maxwell's law. And extracting the solution on the side of the molecular motion direction by using an injector, and adjusting the pH to 10 by adding water, ammonia water and ethylene glycol, wherein the concentration of the finally prepared coal water slurry additive solution is ensured to be 30 wt%.
The dielectric constant of the prepared coal water slurry additive is 9.8 by using a dielectric constant detector.
Preparing the coal water slurry: taking 72.8g of coal powder and 0.2g (dry basis mass) of the prepared coal water slurry additive, adding water to dilute the coal powder and the prepared coal water slurry additive to 100g, and uniformly stirring the mixture to obtain the flowable coal water slurry.
The fluidity is detected to be B-according to a standard method, the apparent viscosity of the coal water slurry is determined to be 1078mPa & s at 25 ℃ by using a viscometer, and the concentration of the coal water slurry is determined to be 61.9 wt% by using a rapid moisture meter.
The prepared coal water slurry is placed in a coal slurry conveying pipeline with a magnetizing coil (the voltage of the coal water slurry is 220V/current of 13A), and the apparent viscosity of the coal water slurry in the pipeline at 25 ℃ is repeatedly measured by using a viscometer after 72 hours, namely 1217mPa & s.
Comparative example 2
In the preparation method of the polar polymer type coal water slurry additive, the reaction device is a horizontal cylindrical reactor, and the structural schematic diagrams shown in fig. 2 and fig. 3 can be referred, wherein the length-diameter ratio of the reactor is 4 (wherein, the length of the reactor is 90cm), 8 groups of current coil strips are arranged on the side wall of the reactor, and the difference is that no polarizing electrode is arranged at the left end and the right end of the reactor.
(1) An aqueous solution of polyacrylic acid (number average molecular weight 4000) having a concentration of 12% by weight was placed in a horizontally placed cylindrical glass reactor. Adding a 15 wt% polyethylene glycol (number average molecular weight of 1200) aqueous solution into the polyacrylic acid solution, and stirring for 2 h; in the stirring process, the mass of concentrated sulfuric acid added every 50min is 5 wt% of polyacrylic acid, and mixed liquor containing high molecular polymer is obtained after reaction. In the reaction system, the mass ratio of polyacrylic acid to polyethylene glycol added was 30/70.
(2) And (2) introducing current into a current coil strip on the outer side wall of the cylindrical reactor through conventional voltage equipment, setting the output frequency of a variable frequency transformer to be 60HZ and the current to be 10A, keeping the frequency for 40min to act on the obtained mixed liquid containing the high molecular polymer, and obtaining the solution on the side of the molecular motion direction according to the Maxwell's law. And extracting the solution on the side of the molecular motion direction by using an injector, and adjusting the pH to 9 by adding water, ammonia water and ethanol, wherein the concentration of the finally prepared coal water slurry additive solution is ensured to be 50 wt%.
And detecting the dielectric constant of the prepared coal water slurry additive to be 2 by using a dielectric constant detector.
Preparing the coal water slurry: taking 71.8g of coal powder and 0.2g (dry basis mass) of the prepared coal water slurry additive, adding water to dilute the coal powder and the prepared coal water slurry additive to 100g, and uniformly stirring to obtain the flowable coal water slurry.
The fluidity is detected to be B-according to a standard method, the apparent viscosity of the coal water slurry is measured to be 1059 mPa.s at 25 ℃ by using a viscometer, and the concentration of the coal water slurry is measured to be 61 wt% by using a rapid moisture meter.
And (3) placing the coal water slurry in a coal slurry conveying pipeline with a magnetizing coil (the voltage of the coal water slurry is 220V/current of the coal water slurry is 13A), and re-measuring the apparent viscosity of the coal water slurry in the pipeline at 25 ℃ after 72h by using a viscometer, wherein the apparent viscosity cannot be measured (more than 4000mPa & s, and the coal water slurry is precipitated and blocked).
Comparative example 3
In the preparation method of the polar polymer type coal water slurry additive, the reaction device is a horizontal cylindrical reactor, and the structural schematic diagrams shown in fig. 1 and fig. 2 can be referred, but the difference is that the length-diameter ratio is 2 (wherein, the length of the reactor is 90cm), and no polarizing electrode and no current coil strip are arranged in the cylindrical reactor.
An aqueous solution of polyacrylic acid (number average molecular weight 600) having a concentration of 40% by weight was placed in a cylindrical glass reactor placed horizontally. Adding 35 wt% polyethylene glycol (8000) water solution into polyacrylic acid solution, and stirring for 3 hr; in the stirring process, the mass of concentrated sulfuric acid added every 30min is 1 wt% of polyacrylic acid, and mixed liquor containing high molecular polymers is obtained after reaction. In the reaction system, the mass ratio of polyacrylic acid to polyethylene glycol added was 10/90.
The pH value of the system is adjusted to be 9 by adding water and ammonia water, and the concentration of the finally prepared coal water slurry additive solution is ensured to be 40 wt%.
The dielectric constant of the prepared coal water slurry additive is 1.1 by using a dielectric constant detector.
Preparing the coal water slurry: taking 70.8g of coal powder and 0.2g (dry basis mass) of the prepared coal water slurry additive, adding water to dilute the coal powder and the prepared coal water slurry additive to 100g, and uniformly stirring the mixture to obtain the flowable coal water slurry.
The fluidity is detected to be C-according to a standard method, the apparent viscosity of the coal water slurry at 25 ℃ is 2203mPa & s by using a viscometer, and the concentration of the coal water slurry is 60.2 wt% by using a rapid moisture meter.
The prepared coal water slurry is placed in a coal slurry conveying pipeline with a magnetizing coil (the voltage of the coal water slurry is 220V/current of 13A), and the apparent viscosity of the coal water slurry in the pipeline at 25 ℃ is re-measured by using a viscometer after 72 hours, so that the apparent viscosity can not be measured (more than 4000mPa & s, and the obtained product is precipitated and blocked).
Experimental conclusion and analysis:
according to the embodiments, after the electrode polarization treatment is performed on the obtained mixed liquid containing the high molecular polymer, the dielectric constant of the prepared coal water slurry additive is obviously increased, which shows that the larger the potential difference between two ends of molecules in the high molecular compound is, the larger the movement torque of the high molecular compound under the action of the magnetic field in the coal water slurry is, and the better stirring effect is achieved.
The apparent viscosity of the coal water slurry can reflect the conveying capacity and the state of the coal water slurry, and the increase or amplification of the apparent viscosity of the coal water slurry after long-time conveying indicates that the conveying performance is reduced. The apparent viscosity value of the coal water slurry obtained in each embodiment after being placed in a conveying pipeline for 72 hours shows that the apparent viscosity of the high-concentration coal water slurry is increased by less than 50mPa & s basically in the long-term storage and transportation process, and the overall apparent viscosity meets the conveying requirement within 1000mPa & s. Therefore, the coal water slurry additive can effectively prevent the high-concentration coal water slurry from settling and blocking in the long-term storage and transportation process.
From the experimental results of example 2, it was found that the apparent viscosity of the coal-water slurry in the coal slurry transportation pipeline with the magnetizing coil was reduced by 143P a · s after 72 hours. The main reason is that the polar high molecular water-coal-slurry additive in the water-coal-slurry continuously moves in the magnetic field environment to form countless stirring systems, so that the raw coal is uniformly mixed in the water medium to achieve a near-ideal state.
From the experimental results of comparative example 2, it can be seen that the dielectric constant of the resulting coal water slurry additive is significantly reduced when the resulting mixed solution containing the high molecular polymer is not subjected to electrode polarization treatment. After the water-coal-slurry stirring device is used for water-coal-slurry, a good stirring effect cannot be achieved, and the problem of sedimentation and blockage of high-concentration water-coal-slurry in the long-term storage and transportation process cannot be effectively prevented. From the experimental results of comparative example 1, it is known that even if the obtained mixed solution containing the high molecular polymer is subjected to electrode polarization treatment, the fluorination reinforcing agent of the present invention is not used in the fluorination reinforcing operation, and the dielectric constant of the obtained coal water slurry additive is low, which indicates that the effect of preventing the sedimentation and blockage of high concentration coal water slurry during long-term storage and transportation is not good under the condition that the fluorination reinforcing is not satisfactory.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (27)
1. A preparation method of polar high molecular type coal water slurry additive solution is characterized by comprising the following steps:
1) mixing a polyacrylic acid solution and a polyethylene glycol solution in a reaction device, adding concentrated sulfuric acid in the mixing process, and reacting to obtain a mixed solution containing a high molecular polymer;
the reaction device is provided with a polarized electrode (3) and a closed current coil strip (4), and the connecting line direction of the positive electrode and the negative electrode of the polarized electrode is parallel to the current direction of the current coil strip;
2) starting the polarizing electrode (3), boosting the pressure to 500-1000V, and then keeping the pressure for 30-60min to perform polarization treatment on the mixed solution containing the high molecular polymer obtained in the reaction device; adding a fluorination reinforcing agent in the polarization treatment process to perform fluorination reinforcement to obtain a fluorinated mixed solution containing the polar high molecular polymer;
3) electrifying the current coil strip (4), keeping the current coil strip for 30-60min, and acting the obtained mixed solution containing the polar high-molecular polymer to obtain a solution on the side of the molecular motion direction; and then adjusting the pH value of the solution at the side of the molecular motion direction to 8-10 to obtain the polar polymer type coal water slurry additive solution.
2. The method of claim 1, wherein the concentration of the polar polymeric coal-water slurry additive solution is 10-50 wt%.
3. The method as claimed in claim 1, wherein in step 2), the polarizing electrode (3) is turned on and then raised to 600-1000V.
4. The production method according to claim 1, wherein the reaction apparatus is a horizontal cylindrical reactor comprising a reactor barrel (1) and two reactor end faces (5) connected to left and right ends of the barrel; the length-diameter ratio of the horizontal cylindrical reactor is 3-8.
5. The method according to claim 4, wherein the length to diameter ratio of the horizontal cylindrical reactor is 5 to 8.
6. The method according to claim 4, wherein the polarizing electrodes (3) are provided on the inner walls of both reactor end faces (5), respectively, in the horizontal cylindrical reactor.
7. The method according to claim 4, wherein a plurality of sets of the current coil strips are wound on the outer wall of the horizontal cylindrical reactor such that the connecting line directions of the positive and negative electrodes of the polarized electrode are parallel to the current direction of the current coil strips.
8. The method of manufacturing of claim 7, wherein each set of the current coil strip is wound in a manner that: the current coil strip is extended on the outer wall of the reactor barrel (1) and on the outer walls of the two reactor end faces (5) connected with the barrel, so that a closed coil is formed.
9. Preparation method according to claim 4, characterized in that on the outer wall of the reactor cylinder (1) the spacing between two adjacent sets of current coil strips is equal.
10. The method of claim 4, wherein the number of current coil strips is 4-16 groups.
11. The method of claim 10, wherein the number of current coil bars is 8-16 groups.
12. The method according to any one of claims 1 to 11, wherein in step 1), the mixing is carried out for a period of time of 2 to 4 hours; in the mixing process, the mass of concentrated sulfuric acid added every 30-60min is 1-10 wt% of that of polyacrylic acid;
the mass ratio of the polyacrylic acid to the polyethylene glycol is 20/80-40/60 based on the total amount of the polyacrylic acid and the polyethylene glycol.
13. The method according to any one of claims 1 to 11, wherein the concentration of the polyacrylic acid solution is 10 to 30 wt%; the number average molecular weight of the polyacrylic acid is 800-; and/or
The concentration of the polyethylene glycol solution is 10-30 wt%; the number average molecular weight of the polyethylene glycol is 400-6000; and/or
The solvent in the polyacrylic acid solution and/or polyethylene glycol solution is one or more selected from water, ethanol, acetone and isopropanol.
14. The method according to claim 13, wherein the concentration of the polyacrylic acid solution is 12 to 20 wt%; the number average molecular weight of the polyacrylic acid is 4000-8000; and/or
The concentration of the polyethylene glycol solution is 10-15 wt%; the number average molecular weight of the polyethylene glycol is 400-2000.
15. The production method according to any one of claims 1 to 11 and 14, wherein in the step 2), the pressure is increased at a rate of 10 to 100V/min.
16. The method according to claim 15, wherein in the step 2), the pressure is increased at a rate of 50 to 80V/min.
17. The production method according to any one of claims 1 to 11, 14, and 16, wherein the mass of the fluorinated reinforcing agent added every 10 to 20min is 20 to 40 wt% of the mass of the polyacrylic acid during the polarization treatment of step 2).
18. The preparation method according to any one of claims 1 to 11, 14 and 16, wherein in the step 2), the fluorinated reinforcing agent is a difluorocarbene reagent.
19. The method of claim 18, wherein the difluorocarbene reagent is selected from the group consisting of difluoromethylenephosphonium inner salt and/or difluorophosphonium acetate inner salt.
20. The method of claim 19, wherein the difluorocarbene reagent is a phosphonium difluoroacetate inner salt.
21. The method for preparing a coil strip of a motor vehicle according to any one of claims 1 to 11, 14, 16 and 19 to 20, wherein in the step 3), the output frequency of the current coil strip is 20 to 120HZ, and the current supplied to the current coil strip is 5 to 20A.
22. The method as claimed in claim 21, wherein in step 3), the current applied to the current coil strip is 10-20A.
23. The method according to any one of claims 1 to 11, 14, 16, 19 to 20, and 22, wherein in step 3), the pH of the solution is adjusted by adding water, aqueous ammonia, and a cosolvent.
24. The preparation method according to claim 23, wherein the cosolvent is selected from one or more of methanol, ethanol, n-propanol, isopropanol and ethylene glycol.
25. The polar polymer type coal water slurry additive solution prepared by the method according to any one of claims 1 to 24.
26. The application of the polar high molecular type coal water slurry additive solution is characterized by comprising the following steps:
uniformly mixing the polar high-molecular water-coal-slurry additive solution with water and coal to prepare water-coal-slurry; putting the obtained coal water slurry into a coal slurry conveying pipeline with a magnetizing coil for use; the polar polymer type coal water slurry additive solution is the polar polymer type coal water slurry additive solution prepared by the preparation method of any one of claims 1 to 24.
27. The use according to claim 26, wherein the ratio of the dry mass of the polar polymeric coal-water slurry additive solution to the dry mass of coal in the coal-water slurry is 0.2 to 1 wt%.
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