CN110639218A - Method and device for drying polymer fluid loss agent and improving bulk density - Google Patents
Method and device for drying polymer fluid loss agent and improving bulk density Download PDFInfo
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- CN110639218A CN110639218A CN201910851007.7A CN201910851007A CN110639218A CN 110639218 A CN110639218 A CN 110639218A CN 201910851007 A CN201910851007 A CN 201910851007A CN 110639218 A CN110639218 A CN 110639218A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0082—Regulation; Control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/22—Evaporating by bringing a thin layer of the liquid into contact with a heated surface
- B01D1/222—In rotating vessels; vessels with movable parts
- B01D1/228—In rotating vessels; vessels with movable parts horizontally placed cylindrical container or drum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/22—Evaporating by bringing a thin layer of the liquid into contact with a heated surface
- B01D1/24—Evaporating by bringing a thin layer of the liquid into contact with a heated surface to obtain dry solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B3/00—Presses characterised by the use of rotary pressing members, e.g. rollers, rings, discs
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Abstract
The invention discloses a method and a device for drying a polymer filtrate reducer and improving the bulk density, belonging to the field of chemical industry, wherein the device comprises a roller scraper dryer and a wheel mill sand mixer, wherein the roller scraper dryer comprises a liquid trough, a roller, a scraper and a heating part, and the wheel mill sand mixer comprises a charging barrel and a grinding wheel; the method comprises the following steps: pouring the liquid polymeric macromolecule fluid loss agent into a liquid trough; preheating the roller and keeping the temperature of the roller within a certain range; starting the roller, and taking out the liquid polymer fluid loss agent from the liquid trough by the rotating roller and drying the liquid polymer fluid loss agent; the scraper scrapes the polymer fluid loss agent dried into solid from the roller; adding the solid polymer fluid loss agent into a charging barrel to a certain height; the roller is started to roll the solid polymer fluid loss agent to increase the bulk density. The invention not only can effectively dry the polymer fluid loss agent, but also can improve the bulk density of the dried powder, thereby facilitating the packaging and transportation.
Description
Technical Field
The invention relates to the field of production of fluid loss additives, in particular to a method and a device for drying and increasing bulk density of a polymer fluid loss additive.
Background
An important link in the oil and gas exploitation link is well drilling, and well cementation operation needs to be carried out on a well hole in order to provide a long-term stable channel for later oil extraction after the well drilling is finished. The depth of a typical oil well is thousands of meters or more, and in such a wellbore depth environment, the pressure of the formation reaches tens of megapascals or even hundreds of megapascals, and the temperature of the formation reaches tens or even more than two hundred degrees celsius. Cementing materials exhibit properties in such extreme environments that are quite different from their properties in the surface environment, wherein the phenomenon of severe water loss of the cementing material in high temperature and pressure environments adds a number of difficulties to the cementing operation. The effective method adopted aiming at the problem of water loss of the well cementation material at present is to add a fluid loss agent.
The current research shows that the action mechanism of the fluid loss agent has the following points: 1. the granular material blocks the pores of the stratum through the distribution of the granules so as to reduce a channel for the liquid in the cement paste to flow to the stratum; 2. the viscosity of the cement paste is increased, and the resistance of liquid phase outflow is increased; 3. the water-soluble polymer is adsorbed on the surface of the cement particles to form a solvolysis layer, so that the cement particles are uniformly dispersed with water, and the proportion of free water in the system is reduced; 4. forming a polymer film or colloidal particles to prevent the liquid phase from flowing out.
The current commonly used fluid loss additives mainly comprise the following granular materials: bentonite, fly ash, zeolite powder, volcanic ash, latex, asphalt and the like block the pores of the stratum or the pores of a cement filter cake, block a liquid phase flow channel and reduce the water loss of cement paste; natural modified polymer: the high polymer material prepared by modifying cellulose, tannin, lignin, lignite and the like has good water loss reduction effect in practical application; polymerization of polymer: polyvinyl alcohol, polyacrylamide, and dimers or polymers of monomers such as acrylic acid, itaconic acid, maleic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, N-dimethylacrylamide, and N-vinylpyrrolidone.
The oil well cement fluid loss agents have advantages in application, but with the fact that petroleum resources are gradually reduced in recent years, the drilling depth is continuously deepened, the stratum condition is more complicated, the conventional granular materials and natural modified polymer fluid loss agents cannot meet the production requirement, and the polymerized polymer fluid loss agents are applied to oilfield production due to good stability and water loss control performance.
At present, most of polymer water loss reducing agent products are liquid products, the consumption of the water loss reducing agent serving as a main additive in well cementation is huge in an oil field, the solid content of the polymer water loss reducing agent is only 5-20% due to the fact that the viscosity of synthetic liquid is relatively high, and the solid content of the 2-acrylamide-2-methylpropanesulfonic acid water loss reducing agent with the largest oil field consumption is only about 10% due to the fact that the viscosity of the synthetic liquid is large and the completeness of polymerization reaction, the stability of product quality, the operability of production and the like are guaranteed. Too high a water content greatly increases the transportation cost and logistics pressure of the polymeric polymer fluid loss additive, especially in the case of long-distance transport across the country. And the liquid fluid loss agent has much inconvenience in the use process, especially in a low-temperature environment, and the problems that the polymeric polymer fluid loss agent using water as a solvent is solidified in use, the viscosity of the polymer is increased, and the polymer cannot be pumped and the like are caused, so that great inconvenience is brought to the field use. In addition, the solvent of the liquid fluid loss agent is mostly water or common organic solvent, and bacteria are easy to breed after the liquid fluid loss agent is placed for a long time, so that the quality guarantee period of the fluid loss agent is greatly shortened. Therefore, it is necessary to prepare a liquid polymer fluid loss additive in a solid form.
The drying method of the fluid loss agent commonly used in China at present comprises the following steps: spray drying, freeze drying, granulating, and fluidized bed drying. Spray drying requires that the viscosity of liquid materials is relatively low so as to fully atomize the liquid by means of pressure, a rotary atomizer and the like and further dry the liquid, but the method is not suitable for the polymeric polymer fluid loss agent with relatively high liquid viscosity; freeze drying is suitable for materials with high solid content and sensitive to temperature, but the equipment investment and the drying cost are higher; the granulating and drying require the material to have plasticity under high concentration, but the polymer fluid loss agent can not meet the requirement generally; fluidized bed drying is suitable for drying solid particles. Therefore, the prior methods can not meet the requirements of drying and subsequent packaging production of the polymer fluid loss additive.
In addition, in the drying process of the polymer, due to the dragging force of water molecules bound in the molecular chain in the heating evaporation process, the form of the polymer is dragged to be looser, so that the bulk density of solid powder obtained after drying is small, the whole body presents a fluffy state, and the bulk density of the material obtained after drying is 0.30g/cm3This causes great inconvenience to packaging and transportation, as follows. The conventional roller compaction has the defect that the stacking density cannot be greatly improved after one-time compaction, and the dust amount is large in the operation processes of feeding and the like, so that the materials are wasted and the environment is polluted.
Disclosure of Invention
Aiming at the problems that the polymerized polymer fluid loss agent is difficult to dry and the bulk density is difficult to improve in the prior art, the invention aims to provide a method for drying the polymerized polymer fluid loss agent and improving the bulk density.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the method for drying the polymer fluid loss agent and improving the bulk density is established in the use of a roller scraper dryer and a wheel mill mixer, wherein the roller scraper dryer comprises a liquid trough, a roller, a scraper and a heating part, and the wheel mill mixer comprises a charging barrel and a grinding wheel;
the method comprises the following steps:
step 3, taking out the liquid polymer fluid loss agent from the liquid trough by the rotary roller and drying;
step 4, scraping the polymer fluid loss agent dried into a solid state from the roller by a scraper;
step 5, putting the solid-state polymerization polymer fluid loss agent obtained in the step 4 into a charging barrel of a wheel mill sand mixer to be stacked to a certain height;
and 6, rolling the solid polymer fluid loss agent by a rolling wheel to increase the bulk density of the solid polymer fluid loss agent.
Preferably, in the step 1, the depth of the liquid polymeric polymer fluid loss additive in the liquid trough is 4-5cm below the liquid level of the bottom of the roller.
Preferably, in step 2, the temperature of the roller is between 120 and 200 ℃.
Preferably, in step 3, the rotating speed of the roller is 2-4 r/min.
Preferably, in step 5, the stacking height of the solid polymer fluid loss additive in the cylinder does not exceed the center of the grinding wheel.
6. The method of claim 1, wherein the polymeric fluid loss additive is dried and the bulk density of the polymeric fluid loss additive is increased by: in step 6, the rotating speed of the grinding wheel is 10-20 r/min.
The invention also provides a device for implementing the method for drying the polymer fluid loss agent and improving the bulk density, which comprises a roller scraper dryer and a wheel mill mixer; the roller scraper dryer comprises a support, a liquid trough, a roller, a drying motor, a drying speed reducer, a scraper and a heating part, wherein the roller, the drying motor, the drying speed reducer and the scraper are all mounted on the support; the wheel grinds roller mill includes feed cylinder, motor, speed reducer, main shaft and runner, the main shaft rotates to be connected on the diapire of feed cylinder, install the rocking arm on the main shaft lateral wall, the runner is installed on the rocking arm, the motor with the input shaft of speed reducer the output shaft of speed reducer with main shaft mechanical connection.
Preferably, the scraper is connected with the support in a sliding mode, and the support is provided with an air cylinder for adjusting the distance between the scraper and the roller.
Further, cylinder scraper dryer is still including installing distributing device on the support, the distributing device is rectangular form, the distributing device with the cylinder touches and connects so that the liquid material evenly distributed of adhesion on the cylinder.
The scraper is characterized by further comprising a material conveying device, wherein the material conveying device comprises a spiral stranding cage and an airflow conveying device, the spiral stranding cage is located under the scraper, a feed port of the airflow conveying device is connected with a discharge port of the spiral stranding cage, and a discharge port of the airflow conveying device is connected with a feed port of the charging barrel.
By adopting the technical scheme, the method has the advantages that:
(1) the drying process is suitable for wide range of material viscosity, and is particularly suitable for drying polymers with high viscosity and difficult granulation, which cannot be realized by methods such as spray drying, fluidized bed drying and the like;
(2) the effect of adjusting the heating time of the material can be achieved by adjusting the rotating speed of the roller, and the property of the material is ensured not to be changed due to long-time heating;
(3) the drying process has low energy consumption and high yield;
(4) the rolling process can realize multiple times of rolling of the material after one-time feeding, and the rolling efficiency is higher than that of a roller;
(5) the rolling process is totally closed, and the dust is small.
Drawings
FIG. 1 is a front view of a drum scraper dryer in an apparatus for drying and increasing bulk density of a polymeric fluid loss additive according to the present invention;
FIG. 2 is a left side view of a drum scraper dryer in an apparatus for drying and increasing bulk density of a polymeric fluid loss additive according to the present invention;
FIG. 3 is a schematic structural diagram of a wheel mill mixer in the apparatus for drying and increasing bulk density of a polymer fluid loss agent of the present invention;
FIG. 4 is a top view of a wheel mill mixer in an apparatus for drying and increasing bulk density of a polymeric fluid loss additive according to the present invention;
FIG. 5 is a flow chart of the method for drying and increasing bulk density of the polymer fluid loss additive of the present invention.
In the figure, 1-support, 2-liquid trough, 3-roller, 4-drying motor, 5-drying speed reducer, 6-scraper, 7-heating part, 8-cylinder, 9-distributor, 10-charging barrel, 11-charging barrel support, 12-motor, 13-speed reducer, 14-main shaft, 15-grinding wheel, 16-rotating arm, 17-spiral stranding cage, 18-outer arc scraper and 19-inner arc scraper.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 and 2, the present invention provides a method and an apparatus for drying and bulk density increasing polymeric fluid loss additive, wherein the apparatus for drying and bulk density increasing polymeric fluid loss additive comprises a roller scraper dryer and a wheel mill mixer.
The roller scraper dryer is used as the prior art and comprises a support 1, a liquid trough 2, a roller 3, a drying motor 4, a drying speed reducer 5, a scraper 6 and a heating part 7; usually, the drum 1, the drying motor 4, the drying speed reducer 5, and the scraper 6 are all mounted on the support 1 for use, and the liquid tank 2 may be mounted on the support 1 or not, and in this embodiment, it is preferable that the liquid tank 2 is mounted on the support 1, and the liquid tank 2 is located directly below the drum 3.
The input shaft of the drying motor 4 and the drying speed reducer 5, the output shaft of the drying speed reducer 5 and the roller 3 are both mechanically connected, and the mechanical connection is preferably a coupling connection in the embodiment.
Foretell heating part 7 is connected with cylinder 3 and is used for heating cylinder 3, and heating part 7 adopts modes such as steam heating, electrical heating, conduction oil heating, natural gas heating all can, and the preferred steam heating of this embodiment, cylinder scraper dryer is steam cylinder scraper dryer promptly. While the heating part 7 generally comprises a steam generating device and a steam delivery pipe for connecting the steam generating device with the drum 3, the temperature of the drum 3 is maintained by charging high temperature steam into the drum 3, while the tumble dryer is generally provided with a trap and a drain pipe for draining the moisture in the drum 3.
The scraper 6 contacts with the circumferential side wall of the roller 3 to scrape the dried solid polymer fluid loss additive from the roller 3. In this embodiment, scraper 6 and support 1 sliding connection, the slip direction of scraper 6 satisfies can change the interval between scraper 6 and the cylinder 3, installs the cylinder 8 that is used for adjusting the interval between scraper 6 and the cylinder 3 on the support 1 simultaneously. In this embodiment, the scraper 6 is a long stainless steel high-toughness scraper.
In order to improve the distribution uniformity of the liquid polymer fluid loss agent on the roller 3, in this embodiment, a distributor 9 is disposed on the bracket 1, the distributor 9 is in a strip shape, preferably made of a high temperature resistant silicone rubber material, and the distributor 9 contacts with the roller 3 to uniformly distribute the liquid material adhered on the roller 3.
The above-described wheel mill is also a conventional one, and generally includes a barrel 10, a barrel holder 11, a motor 12, a reduction gear 13, a main shaft 14, and a grinding wheel 15, as shown in fig. 3 and 4.
The cartridge 10 is a bottomed cylinder, the cartridge 10 is disposed vertically with an opening facing upward, the cartridge holder 11 is supported at the bottom of the cartridge 10, and an openable and closable lid is provided at the upper end of the cartridge 10. The spindle 14 is rotatably connected to the bottom wall of the cartridge 10, and the spindle 14 is coaxially disposed with the cartridge 10. The side wall of the main shaft 14 is provided with two vertical rotating arms 16, the two rotating arms 16 are arranged coaxially, and each rotating arm 16 is provided with the grinding wheel 15.
The motor 12 and the speed reducer 13 are both mounted on the cartridge holder 11, the motor 12 is mechanically connected to an input shaft of the speed reducer 13, and an output shaft of the speed reducer 13 is mechanically connected to the main shaft 14.
In order to prevent the solid polymer fluid loss additive from adhering to the inner wall of the barrel 10, arc-shaped scrapers, specifically, an outer arc-shaped scraper 18 for scraping off the adhered materials on the outer side of the bottom wall and the inner wall of the circumference of the barrel 10 and an inner arc-shaped scraper 19 for scraping off the adhered materials on the inner side of the bottom wall, are arranged on the rotating arm 16 or the main shaft 14 in the embodiment.
In general, the roller scraper dryer and the wheel mill are separated at different places during use, so that a material conveying device for conveying materials is required to be arranged between the roller scraper dryer and the wheel mill, and the material conveying device comprises a spiral stranding cage 17 and an air flow conveying device. Wherein, the spiral stranding cage 17 is positioned under the scraper 6 and is used for receiving the solid materials scraped from the roller 3, and the solid materials are collected to the discharge hole to be discharged under the pushing action of the spiral blade; the feeding hole of the air flow conveying device is connected with the discharging hole of the spiral stranding cage 17, and the discharging hole of the air flow conveying device is connected with the feeding hole of the charging barrel 10, so that the solid materials are conveyed into the charging barrel 10.
In this embodiment, the air flow conveying device includes a cloth bag pulse collector, a shutoff fan and a material conveying pipeline. The material conveying pipeline is connected to the feed end of the cloth bag pulse collector, and the negative pressure suction force generated by a fan in the cloth bag pulse collector is relied on to suck the materials into the cloth bag pulse collector through the material conveying pipeline to be collected; the air shutoff machine is connected to the discharge end of the cloth bag pulse collector, and discharges the powder materials collected in the cloth bag pulse collector into the charging barrel 10 by rotating the air shutoff machine;
when the addition of the solid powder can reach one fourth of the height of the grinding wheel 15, the wheel grinding mixer is started, and the motor 12 drives the grinding wheel 15, the outer arc-shaped scraper 18 and the inner arc-shaped scraper 19 to do circular motion around the main shaft 14. While the grinding wheel 15 is moving in a circular motion around the main shaft 14, the solid powder material between the surface of the grinding wheel 15 and the surface of the bottom plate of the barrel 10 applies a friction force to the grinding wheel 15, thereby rotating the grinding wheel 15 around the rotating arm 16. Outer arc scraper 18, interior arc scraper 19 can push the material on the feed cylinder 10 diapire to the below of running wheel 15 by the center of diapire and border position around main shaft 14 pivoted in-process thereby rolled by running wheel 15, and outer arc scraper 18, interior arc scraper 19 also can be turned up the material on the diapire in rotating from supreme down, let the material on the diapire from inside to outside, from supreme misce bene down, improve rolling efficiency.
As shown in FIG. 5, in addition to the use of the device for drying and increasing the bulk density of the polymer fluid loss agent, the invention also provides a method for drying and stacking the polymer fluid loss agent,
the method comprises the following steps:
step 3, starting the roller 3, taking the liquid polymer fluid loss agent out of the liquid trough 2 by the rotating roller 3, and drying the liquid polymer fluid loss agent through the surface temperature of the liquid polymer fluid loss agent;
step 4, scraping the polymer fluid loss agent dried into a solid state from the roller 3 by a scraper 6;
step 5, putting the solid-state polymerization polymer fluid loss agent obtained in the step 4 into a charging barrel 10 and stacking to a certain height;
and 6, starting a grinding wheel 15 to grind the solid polymer fluid loss agent to increase the density of the solid polymer fluid loss agent.
Specifically, in the step 1, the depth of the liquid polymeric polymer fluid loss agent in the liquid tank 2 is preferably 4-5cm below the bottom 2 of the roller, and preferably 4cm below the bottom of the roller 2 in this embodiment; because too great a depth of immersion would cause too much liquid material to adhere to the side of the cylinder 3, causing it to pass to the doctor 6 without drying; when the immersion depth is too small, the contact area between the surface of the roller 3 and the materials is small, the heat exchange is less, and the drying efficiency is influenced;
in step 2, the temperature of the roller 3 is between 120-200 ℃, preferably 149 ℃ in the embodiment; under the steam heating mode, the purpose of adjusting the surface temperature of the roller 3 can be achieved by controlling the steam pressure and the flow rate input to the roller 3;
in the step 3, the rotating speed of the roller 3 is 2-4r/min, and the liquid polymer fluid loss agent stays on the surface of the roller 3 for about 20s, so 3r/min is preferred in the embodiment;
in step 5, the stacking height of the solid polymer fluid loss agent in the charging barrel 10 does not exceed the center of the grinding wheel 15; because the rolling wheel 15 does not have a driving force to generate a rotation torque when rotating along with the main shaft 14, the arrangement can ensure that the direction acting force on the rolling wheel 15 in the rotation direction tends to be consistent (namely the friction force between the rolling wheel 15 and the material faces to one direction), ensure that the rolling wheel 15 can rotate smoothly, and further ensure the rolling effect;
in step 6, the rotation speed of the grinding wheel 15 is 10-20r/min, preferably 15r/min in the embodiment, so as to ensure that the materials can be sufficiently ground.
According to the arrangement of the above method, the present invention provides the following embodiments:
example one
Setting a polymer fluid loss agent as acrylamide copolymer, wherein the polymer fluid loss agent is in a liquid state, the viscosity is 4089cps, and the solid content is 15.3%; controlling the steam pressure to be 0.5MPa through a pneumatic film regulating valve, and keeping the surface temperature of the roller 3 to be 149 ℃; setting the rotating speed of the roller 3 to be 3 r/min; setting the height of the liquid level immersion roller 3 to be 4 cm;
in the drying process, the liquid polymer fluid loss agent is uniformly distributed on the roller 3 under the action of the distributor 9, and is scraped by the scraper to enter the spiral stranding cage along with the rotation of the roller 3 to the position of the scraper 6, and at the moment, the solid powder obtained by drying has the bulk density of 0.21g/cm3Water content 5.03%;
then sending the solid powder obtained by drying into a wheel mill mixer through a cloth bag pulse collector for rolling; setting the rotating speed of a main shaft 14 of the wheel grinding sand mixer to be 15 r/min; the feeding amount is 500Kg, and the time is 10 min; starting the motor 12 to roll for 60min after the feeding is finished;
the final form of the polymeric polymer fluid loss additive obtained after rolling is also solid powder, and the bulk density of the polymeric polymer fluid loss additive is 0.57g/cm3Compared with the material in the liquid state, the solid material after drying and stacking operation is convenient for packaging and can be stackedThe transportation is convenient.
Example two
The difference from the first embodiment is that: the polymer fluid loss agent is a copolymer of acrylic acid and acrylamide, is in a liquid state, has the viscosity of 20cps and the solid content of 29.2 percent; controlling the steam pressure to be 0.25MPa by a pneumatic film regulating valve, and keeping the surface temperature of the roller 3 to be 120 ℃; the rotating speed of the roller 3 is set to be 4 r/min; setting the height of the liquid level immersion roller 3 to be 5 cm;
in the drying process, the liquid polymer fluid loss agent is uniformly distributed on the roller 3 under the action of the distributor 9, and is scraped by a scraper to enter a spiral stranding cage along with the rotation of the roller 3 to the position of the scraper 6, and the obtained material is dried into solid powder; drying the obtained solid powder to obtain a bulk density of 0.27g/cm3Water content 4.49%;
then sending the solid powder obtained by drying into a wheel mill mixer through a cloth bag pulse collector for rolling; setting the rotating speed of a main shaft 14 of the wheel grinding sand mixer to be 10 r/min; the feeding amount is 600Kg, and the time is 10 min; starting the motor 12 to roll for 60min after the feeding is finished;
the final form of the polymeric polymer fluid loss additive obtained after rolling is also solid powder, and the bulk density of the polymeric polymer fluid loss additive is 0.67g/cm3。
EXAMPLE III
The difference from the first embodiment is that: the polymer fluid loss agent is also an acrylamide copolymer and is in a liquid state, but the viscosity of the polymer fluid loss agent is 11940cps, and the solid content of the polymer fluid loss agent is 15.7%; controlling the steam pressure to be 1.6MPa by a pneumatic film regulating valve, and keeping the surface temperature of the roller 3 at 200 ℃; the rotating speed of the roller 3 is set to be 4 r/min; setting the height of the liquid level immersion roller 3 to be 4 cm;
in the drying process, the liquid polymer fluid loss agent is uniformly distributed on the roller 3 under the action of the distributor 9, and is scraped by a scraper to enter a spiral stranding cage along with the rotation of the roller 3 to the position of the scraper 6, and the obtained material is dried into solid powder; drying the obtained solid powder to obtain a bulk density of 0.22g/cm3Water content 6.97%;
then sending the solid powder obtained by drying into a wheel mill mixer through a cloth bag pulse collector for rolling; setting the rotating speed of a main shaft 14 of the wheel grinding sand mixer to be 20 r/min; the feeding amount is 600Kg, and the time is 10 min; starting the motor 12 to roll for 90min after the feeding is finished;
the final form of the polymeric fluid loss additive obtained after rolling is also solid powder with the bulk density of 0.53g/cm3。
As can be seen from the three examples described above, the method of the present invention is suitable for drying and bulk density increasing of polymeric polymer fluid loss additives with viscosities ranging from tens to more than ten thousand. The product obtained by drying and rolling is solid powder, the service performance of the product obtained by drying and rolling is not changed, the product obtained by drying has low moisture and can obtain solid powder with different moisture by adjusting the rotating speed of the roller 3 according to requirements, and the rolling process can greatly improve the bulk density of the solid powder of the polymeric macromolecule fluid loss agent and can obtain different bulk densities by adjusting the rolling time according to requirements.
The invention also supplements a test example for carrying out performance test on the final product prepared by the method, and proves that the method of the invention does not influence the service performance of the product.
Taking a formula 1: 100 parts of grade G cement +44 parts of deionized water +1 part of the solid powder finally obtained in example one;
taking a formula 2: 100 parts of grade G cement + +38.46 parts of deionized water +6.54 parts of the liquid polymeric fluid loss additive of example one (15.3% solids).
The formula 2 is a proportion which is obtained by converting the solid content of the liquid polymer fluid loss agent and has the same content of the active ingredients in the formula 1. The cement paste is prepared according to the API 10B-3-2004 standard, and the water loss test is carried out according to GB/T19139-. The test results are shown in Table 1.
TABLE 1
The test result shows that, in consideration of the influence of the test error, the service performance of the solid powder finally obtained in the first embodiment is basically consistent with the water loss reducing effect of the water loss reducing agent in a liquid state, and the service performance is not influenced.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (10)
1. The method for drying the polymer fluid loss agent and improving the bulk density is characterized by comprising the following steps: the method is established in the use of a roller scraper dryer and a wheel milling sand mixer, wherein the roller scraper dryer comprises a liquid trough, a roller, a scraper and a heating part, and the wheel milling sand mixer comprises a charging barrel and a grinding wheel; the method comprises the following steps:
step 1, pouring a liquid polymer fluid loss agent into a liquid trough;
step 2, the heating part heats the roller and keeps the temperature of the roller within a certain range;
step 3, taking out the liquid polymer fluid loss agent from the liquid trough by the rotary roller and drying;
step 4, scraping the polymer fluid loss agent dried into a solid state from the roller by a scraper;
step 5, putting the solid-state polymerization polymer fluid loss agent obtained in the step 4 into a charging barrel of a wheel mill sand mixer to be stacked to a certain height;
and 6, rolling the solid polymer fluid loss agent by a rolling wheel to increase the bulk density of the solid polymer fluid loss agent.
2. The method of claim 1, wherein the polymeric fluid loss additive is dried and the bulk density of the polymeric fluid loss additive is increased by: in the step 1, the depth of the liquid polymeric polymer fluid loss agent in the liquid trough meets the condition that the bottom of the roller is submerged 4-5 cm.
3. The method of claim 1, wherein the polymeric fluid loss additive is dried and the bulk density of the polymeric fluid loss additive is increased by: in step 2, the temperature of the roller is between 120 ℃ and 200 ℃.
4. The method of claim 1, wherein the polymeric fluid loss additive is dried and the bulk density of the polymeric fluid loss additive is increased by: in step 3, the rotating speed of the roller is 2-4 r/min.
5. The method of claim 1, wherein the polymeric fluid loss additive is dried and the bulk density of the polymeric fluid loss additive is increased by: in step 5, the stacking height of the solid polymer fluid loss additive in the charging barrel does not exceed the center of the grinding wheel.
6. The method of claim 1, wherein the polymeric fluid loss additive is dried and the bulk density of the polymeric fluid loss additive is increased by: in step 6, the rotating speed of the grinding wheel is 10-20 r/min.
7. An apparatus for carrying out the method of drying and increasing bulk density of polymeric fluid loss additives of any of claims 1-6, wherein: comprises a roller scraper dryer and a wheel grinding sand mixer; the roller scraper dryer comprises a support, a liquid trough, a roller, a drying motor, a drying speed reducer, a scraper and a heating part, wherein the roller, the drying motor, the drying speed reducer and the scraper are all mounted on the support; the wheel grinds roller mill includes feed cylinder, motor, speed reducer, main shaft and runner, the main shaft rotates to be connected on the diapire of feed cylinder, install the rocking arm on the main shaft lateral wall, the runner is installed on the rocking arm, the motor with the input shaft of speed reducer the output shaft of speed reducer with main shaft mechanical connection.
8. The apparatus for drying and increasing bulk density of polymeric fluid loss additive according to claim 7, wherein: the scraper with support sliding connection, install on the support and be used for adjusting the scraper with the cylinder interval.
9. The apparatus for drying and increasing bulk density of polymeric fluid loss additive according to claim 7, wherein: the roller scraper dryer is characterized in that the roller scraper dryer further comprises a distributor arranged on the support, the distributor is in a long strip shape, and the distributor is in contact with the roller so that liquid materials adhered to the roller are uniformly distributed.
10. The apparatus for drying and increasing bulk density of polymeric fluid loss additive according to claim 7, wherein: still include feeding device, feeding device includes spiral hank cage and air current conveyor, spiral hank cage is located under the scraper, air current conveyor feed inlet with the discharge gate of spiral hank cage is connected, air current conveyor's discharge gate with the feed inlet of feed cylinder is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910851007.7A CN110639218A (en) | 2019-09-10 | 2019-09-10 | Method and device for drying polymer fluid loss agent and improving bulk density |
Applications Claiming Priority (1)
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Inventor after: Ding Changguang Inventor after: Yang Zhongli Inventor after: Wang Guangxue Inventor after: Song Qiang Inventor after: Lv Nana Inventor before: Guo Quanqing Inventor before: Yang Zhongli Inventor before: Wang Guangxue Inventor before: Song Qiang Inventor before: Lv Nana |
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