CN212477266U - Device for recycling sludge in papermaking process - Google Patents
Device for recycling sludge in papermaking process Download PDFInfo
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- CN212477266U CN212477266U CN202021363317.9U CN202021363317U CN212477266U CN 212477266 U CN212477266 U CN 212477266U CN 202021363317 U CN202021363317 U CN 202021363317U CN 212477266 U CN212477266 U CN 212477266U
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Abstract
The utility model relates to a device for recycling sludge in a papermaking process, which comprises a sludge adjusting unit, a medicament mixing unit and a sludge mixing unit; the sludge adjusting unit comprises a sludge settling tank, a vibrating screen, a sludge adjusting tank and a sludge storage tank which are sequentially communicated, and stirring devices are arranged in the sludge adjusting tank and the sludge storage tank; the medicament mixing unit comprises a dosing pump, a dilution water pipeline and a static mixer, wherein the static mixer is provided with a first inlet end, a second inlet end and an outlet end, the dosing pump is communicated with the first inlet end through a dosing pipeline, and the dilution water pipeline is communicated with the second inlet end; the sludge mixing unit comprises a sludge mixer, a mixing inlet pipeline and a mixing outlet pipeline are arranged on the sludge mixer, and the mixing inlet pipeline is communicated with the sludge storage pool and the outlet end. The device is suitable for a white water circulating system of a papermaking production line, and is convenient to control and adjust.
Description
Technical Field
The utility model relates to a papermaking waste water treatment field, in particular to a device for recycling sludge in papermaking process.
Background
The paper making white water (hereinafter referred to as white water) is the waste water of paper making workshop section, which comes from the paper making process of paper making workshop. The white water mainly contains fine fiber, filler, paint, dissolved wood components, added sizing material, wet strength agent, preservative and the like, wherein the long fiber is taken away by middle pages during papermaking, the fine fiber is a product taken out from the white water during the dehydration of a wire part during the formation of papermaking, and the fine fiber is lost along with the white water of the wire part. The white water is mainly insoluble COD, the biodegradability is low, the added preservative has certain toxicity, and almost all paper making workshops of paper making factories adopt a partial or full closed system to reduce the water consumption of paper making, save power consumption, improve the white water reuse rate and reduce the discharge of redundant white water.
Because of the mud in the white water of paper mill fails reasonable effective processing, cause white water circulation system poor, production quality is unstable, the environment is abominable, environmental protection treatment cost is high, the environmental protection pressure of paper mill is bigger and bigger, white water is at the workshop endless loop, cause the quality of water in the system more and more poor (white water concentration is high, viscosity is big, and the aquatic contains one stock sour odor), cause the system confusion, the net part dehydration difficulty, the stability of direct influence paper mill workshop production and the fluctuation of product quality: the generated sludge is difficult to treat, the treatment cost is high, and the environmental protection pressure is large.
Although the chinese utility model patent with application number 201310254740.3 recycles the sludge, the organic bromine compound has high toxicity and is not suitable for the modern papermaking process. The utility model discloses a chinese utility model patent of application number 201510822389.2 relates to a medicament for papermaking waste water treatment, need prepare each component in reation kettle, and complex operation can not be applicable to the production line of papermaking waste water with the medicament raw materials directness in, to sum up, need provide a new medicament and method and device and solve relevant problem.
Disclosure of Invention
The utility model discloses an overcome prior art's shortcoming, a device for mud retrieval and utilization in papermaking technology is provided, solved and failed reasonable effective processing because of paper mill's mud, it is poor to cause plain boiled water circulation system, production quality is unstable, the environment is abominable, a series of problems that environmental protection treatment cost is high, sludge denaturation conversion processing apparatus and technology have been researched and developed, to the tiny fibre in the papermaking plain boiled water system, the mud that SS etc. precipitate out (75% is tiny fibre), after the denaturation processing, recycle, changing waste into valuables.
The utility model relates to a medicament for mud retrieval and utilization in papermaking technology, including the component of following part by weight:
22-26% of acrylamide and 24-28% of polyvinylamine; 23-27% of modified starch; 4-6.5% of chitin; 14 to 17 percent of aluminum sulfate and polyaluminium chloride.
Furthermore, the aluminum sulfate is 7-8.5 percent, and the polyaluminium chloride is 7-8.5 percent
Further, the medicament comprises the following components in parts by weight: 25% of acrylamide; 28% of polyvinyl amine; 25% of modified starch; 5% of chitin; 8.5 percent of aluminum sulfate; 8.5 percent of polyaluminum chloride.
The method for recycling the sludge in the papermaking process by using the agent comprises the following steps:
s1, sludge adjustment, namely screening the collected sludge to remove impurities, stirring the sludge in a sludge adjusting tank, adjusting the sludge concentration to sludge slurry, and pumping the sludge slurry into a sludge storage tank for storage for later use;
s2, preparing a medicament, namely mixing the medicament and dilution water in proportion to prepare a medicament solution, wherein the medicament comprises 20-25% of acrylamide, 20-25% of polyvinylamine and 20-25% of modified starch; 4-6.5% of chitin; 15% of aluminum sulfate and polyaluminium chloride;
s3, flocculating for papermaking, namely, mixing and reacting the sludge slurry in the sludge storage tank with the medicament solution, adding the mixture into the slurry and the white water, and uniformly mixing to manufacture paper by papermaking; the mass ratio of the oven-dry mass of the medicament to the oven-dry sludge in the water and sludge slurry is 1:23-26: 18-21.
Specifically, in step S1, the concentration of the sludge slurry is 1-3%.
Specifically, in step S3, the mixing ratio of the sludge mixed and reacted with the chemical solution to the slurry and the white water is 1-2:9-10: 88.5-89.5.
Further, in step S3, the mixing ratio of the sludge mixed and reacted with the chemical solution to the slurry and the white water is 1.5:9.5: 89.
Further, in step S1, the sludge slurry is pumped into the sludge storage tank and then further stirred, and the stirring speed of the sludge adjusting tank and the sludge storage tank is 45-60 r/min.
Furthermore, after the sludge and the reagent solution are mixed and reacted, sampling verification is carried out, and the sludge is added into the slurry and the white water to be mixed after reaching the standard.
Further, sampling and verifying that the standard is not met, pumping the sludge into a sludge storage pool, entering step S3, adding the sludge into the pulp and the white water after the standard is met, uniformly mixing, and manufacturing the paper by using the paper.
The device for recycling the sludge in the papermaking process according to the method comprises a sludge adjusting unit, a medicament mixing unit and a sludge mixing unit;
the sludge adjusting unit comprises a sludge settling tank, a vibrating screen, a sludge adjusting tank and a sludge storage tank which are sequentially communicated, and stirring devices are arranged in the sludge adjusting tank and the sludge storage tank;
the medicament mixing unit comprises a dosing pump, a dilution water pipeline and a static mixer, wherein the static mixer is provided with a first inlet end, a second inlet end and an outlet end, the dosing pump is communicated with the first inlet end through a dosing pipeline, and the dilution water pipeline is communicated with the second inlet end;
the sludge mixing unit comprises a sludge mixer, a mixing inlet pipeline and a mixing outlet pipeline are arranged on the sludge mixer, and the mixing inlet pipeline is communicated with the sludge storage pool and the outlet end.
Furthermore, a sampling port is arranged on the mixing outlet pipeline.
Furthermore, a sludge pump is arranged on the outer side of the bottom of the sludge storage tank, a pump-in pipeline and a pump-out pipeline are arranged on the sludge pump, the pump-in pipeline is communicated with the bottom of the sludge storage tank, the pump-out pipeline is communicated with the mixing inlet pipeline, and a sludge sampling port is arranged on the pump-out pipeline.
Furthermore, a sludge flowmeter is arranged on the pump-out pipeline.
Furthermore, a drain valve is arranged on the sludge mixer and communicated to the sludge regulating unit.
Further, an outlet end pipeline is installed at the outlet end and communicated with the mixing inlet pipeline, and a check valve is arranged on the outlet end pipeline.
Furthermore, a pipe float flowmeter is arranged on the dilution water pipeline, and an electromagnetic flowmeter is arranged on the dosing pipeline.
Specifically, the vibrating screen is a high-frequency vibrating screen or a pressure screen.
The utility model relates to a device that is arranged in papermaking technology mud retrieval and utilization has following characteristics:
1. the medicament of the utility model is nontoxic and free of impurities, reduces the risk of secondary pollution, and does not cause adverse effects on the physical and mental health of operators;
2. the agent is simple to use, and the agent raw materials can be directly prepared in proportion and then naturally mixed with sludge slurry with proper concentration through flowing, so that the agent is suitable for a white water circulating system of a papermaking production line and is convenient to controllably adjust;
3. after the sludge in the white water circulating system is precipitated and separated, large-sized or large-sized impurities in the sludge are cleaned, so that normal production and stable quality of a workshop are facilitated;
4. under the comprehensive reaction of the medicament and the device, sludge in the white water is subjected to denaturation reaction, fine fibers in the sludge are changed from original anions into fine fibers with cation hydrogen bonds and can be automatically adsorbed onto long fibers, residual fine fibers in the sludge are recycled to a production workshop, and meanwhile, the uniformity of paper sheets is improved;
5. through the utility model discloses a medicament and application method and device thereof make in the mud residual fiber (tiny fibre) can recycle, and the utilization ratio reaches more than 95%, reaches changing waste into valuables's purpose, has reduced manufacturing cost, has improved product quality, has increased the benefit of production.
Drawings
FIG. 1 is a schematic flow diagram of a process for sludge recycling in a papermaking process;
FIG. 2 is a schematic structural diagram of a device for recycling sludge in a papermaking process;
wherein, 1-a sludge adjusting unit; 2-a medicament mixing unit; 3-a sludge mixing unit; 4-a sludge sedimentation tank; 5-vibrating and screening; 6-sludge adjusting tank; 7-a sludge storage tank; 8-a stirring device; 9-a dosing pump; 10-a dilution water pipeline; 11-a static mixer; 12-a first inlet end; 13-a second inlet end; 14-an outlet end; 15-outlet end piping; 16-a check valve; 17-a dosing pipeline; 18-sludge mixer; 19-a mixing inlet conduit; 20-a mixing outlet conduit; 21-a sludge pump; 22-a pump-in pipeline; 23-pump-out pipeline; 24-a sludge sampling port; 25-tube float flow meter; 26-an electromagnetic flow meter; 27-a blowdown valve; 28-a sludge flow meter; 29-fan pump; 30-a sampling port; 31-washing the white water tank; 32-papermaking pressure screen.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
The utility model relates to a medicament for mud retrieval and utilization in papermaking technology, including the component of following part by weight:
the medicament comprises the following components in parts by weight: 25% of acrylamide; 28% of polyvinyl amine; 25% of modified starch; 5% of chitin; 8.5 percent of aluminum sulfate; 8.5 percent of polyaluminum chloride.
Wherein the acrylamide has positive gene (-CONH)2) The flocculant can adsorb and bridge suspended particles dispersed in a solution, has strong flocculation effect, can accelerate the sedimentation of the particles in the suspension, and has very obvious effects of accelerating the clarification of the solution, promoting the filtration and the like;
the polyvinylamine also has good retention and filtration aiding effects on the sludge;
the positive ions in the modified starch have the strengthening effect on paper sheets;
chitin is easy to dissolve, and amino (NH) after dissolution2+) Bacteria can be inhibited by combining negative electrons, and meanwhile, the adsorption effect is better;
the aluminum sulfate and the polyaluminium chloride have strong adsorption capacity, and the water purifying effect is superior to that of all traditional inorganic water purifying agents; the flocculating constituent formed after being put into the sludge slurry is large, the sedimentation speed is high, the activity is high, and the filterability is good; and the device has strong adaptability to various raw water, has little influence on the pH value of sludge slurry (the pH value is 4-11), and has obvious purification effect no matter the turbidity of the raw water or the concentration of pollutants in the wastewater. The dosage is less; has small corrosivity to equipment and pipelines, convenient operation, small dosage and low purification cost.
As shown in figure 1, the method for recycling the sludge in the papermaking process by using the medicament comprises the following steps:
s1, sludge adjustment, namely screening the collected sludge to remove impurities, stirring the sludge in a sludge adjusting tank, adjusting the sludge concentration to sludge slurry, and pumping the sludge slurry into a sludge storage tank for storage for later use;
s2, preparing a medicament, namely mixing the medicament (namely the sludge recycling agent in the figure 2) with dilution water in proportion to prepare a medicament solution, 25 percent of acrylamide; 28% of polyvinyl amine; 25% of modified starch; 5% of chitin; 8.5 percent of aluminum sulfate; 8.5 percent of polyaluminum chloride;
s3, flocculating for papermaking, namely, mixing and reacting the sludge slurry in the sludge storage tank with the medicament solution, adding the mixture into the slurry and the white water, and uniformly mixing to manufacture paper by papermaking; the mass ratio of the oven-dry mass of the medicament to the oven-dry sludge in the water and sludge slurry is 1:25: 20.
In step S1, the concentration of the sludge slurry is 1.5%.
And step S1, pumping the sludge into a sludge storage tank and further stirring, wherein the stirring speed of the sludge regulating tank and the sludge storage tank is 45-60 r/min. In this example, 55r/min was used, and stirring was carried out by using a paddle stirrer.
And after the sludge slurry is mixed and reacted with the medicament solution, sampling and verifying are carried out, and the sludge slurry is added into slurry and white water to be mixed after reaching the standard. Sampling and verifying that the standard is not met, pumping the sludge slurry into a sludge storage tank, entering step S3, adding the sludge slurry and the white water after the standard is met, uniformly mixing, and manufacturing paper by using a paper machine. In the embodiment, the reaction reaching the standard is observed by naked eyes, and sludge which does not reach the standard is mixed with water to be in a turbid state; the sludge and water after reaching the standard are obviously separated, are in fine particles, are obviously separated from mud and water, and achieve the purpose of separating mud and water, and meanwhile, the sludge has fine particle flocculation. And then mixing the sludge with the pulp and the white water in a pulp washing white water pool on a papermaking production line, wherein the mixing ratio of the sludge after mixing reaction with the medicament solution to the pulp and the white water is 1.5:9.5:89, and papermaking can not cause adverse effect on the quality of paper products. The pulp and white water in the sluicing white water tank are pumped to a papermaking pressure screen through a sluicing pump, and papermaking is carried out after a head box.
As shown in FIG. 2, the device for recycling sludge in the papermaking process according to the method comprises a sludge adjusting unit, a medicament mixing unit and a sludge mixing unit;
the sludge adjusting unit comprises a sludge settling tank, a vibrating screen, a sludge adjusting tank and a sludge storage tank which are sequentially communicated, and stirring devices are arranged in the sludge adjusting tank and the sludge storage tank;
the medicament mixing unit comprises a dosing pump, a dilution water pipeline and a static mixer, wherein the static mixer is provided with a first inlet end, a second inlet end and an outlet end, the dosing pump is communicated with the first inlet end through a dosing pipeline, and the dilution water pipeline is communicated with the second inlet end;
the sludge mixing unit comprises a sludge mixer, a mixing inlet pipeline and a mixing outlet pipeline are arranged on the sludge mixer, and the mixing inlet pipeline is communicated with the sludge storage pool and the outlet end.
The dilution water pipeline is provided with a pipe float flowmeter, and the dosing pipeline is provided with an electromagnetic flowmeter.
And a sampling port is arranged on the mixing outlet pipeline. The sampling verification of the reacted sludge slurry is convenient.
The sludge pump is arranged on the outer side of the bottom of the sludge storage tank, a pump inlet pipeline and a pump outlet pipeline are arranged on the sludge pump, the pump inlet pipeline is communicated with the bottom of the sludge storage tank, the pump outlet pipeline is communicated with the mixed inlet pipeline, and a sludge sampling port is arranged on the pump outlet pipeline. The sampling port and the sludge sampling port are conventional pipeline sampling structures and comprise branch pipelines, and valves are arranged on the branch pipelines.
The sludge sedimentation tank, the vibrating screen, the sludge adjusting tank and the sludge storage tank are all communicated through pipelines, valves are arranged on the pipelines, wherein the bottom of the sludge sedimentation tank is communicated with the vibrating screen through the pipelines, and the vibrating screen is a high-frequency vibrating screen (0.75-1.0mm) or a pressure screen (0.35-0.5 mm); the vibrating screen cleans large or granular impurities in the sludge, thereby being beneficial to normal production in a workshop and stable quality; mud after the screening is dropped into by mud equalizing basin upper portion, stir and adjust evenly, make mud adjust the sludge slurry that the homogeneity is good, bottom pump sending to mud holding vessel upper portion by the mud equalizing basin again, further adjust the homogeneity of sludge slurry in the mud holding vessel, the later stage of being convenient for fully reacts with medicament solution, the sludge pump is by mud holding vessel bottom with sludge slurry pump sending to the sludge mixing ware in, the pump sending through the sludge pump, sludge slurry has faster velocity of flow, be favorable to sludge slurry and medicament solution to flow the natural mixing in sludge reaction ware. The upper part of the sludge reactor is communicated to a sluicing pump through a pipeline, and the sluicing pump is uniformly mixed with slurry and white water in a sluicing white water pool and then enters a paper making process.
And a sludge flowmeter is arranged on the pump-out pipeline. The flow of sludge pump income sludge reactor in the real-time measurement of being convenient for can hold the flow of medicament and mud, guarantees the reaction effect of mud.
And a drain valve is also arranged on the sludge mixer and communicated to the sludge regulating unit. The debugging process of the mixed reaction of the medicament solution and the sludge slurry is convenient, the sludge slurry is drained into the sludge storage tank for secondary reaction when the sludge slurry does not reach the standard state of paper making, the direct paper making under the state of not reaching the standard is avoided, and the adverse effect on the quality of paper products in the whole production line is generated.
An outlet end pipeline is installed at the outlet end and communicated with the mixing inlet pipeline, and a check valve is arranged on the outlet end pipeline. And when the pressure in the outlet end pipeline is overlarge, the sludge slurry flows back to the outlet end pipeline. The method and the device can ensure that the comprehensive utilization rate of the sludge reaches 98 percent after experimental verification, wherein the fine fiber in the sludge accounts for about 75 percent, and other impurities (filler, silt and the like) account for about 25 percent.
Claims (8)
1. A device for recycling sludge in a papermaking process is characterized by comprising a sludge adjusting unit, a medicament mixing unit and a sludge mixing unit;
the sludge adjusting unit comprises a sludge settling tank, a vibrating screen, a sludge adjusting tank and a sludge storage tank which are sequentially communicated, and stirring devices are arranged in the sludge adjusting tank and the sludge storage tank;
the medicament mixing unit comprises a dosing pump, a dilution water pipeline and a static mixer, wherein the static mixer is provided with a first inlet end, a second inlet end and an outlet end, the dosing pump is communicated with the first inlet end through a dosing pipeline, and the dilution water pipeline is communicated with the second inlet end;
the sludge mixing unit comprises a sludge mixer, a mixing inlet pipeline and a mixing outlet pipeline are arranged on the sludge mixer, and the mixing inlet pipeline is communicated with the sludge storage pool and the outlet end.
2. The apparatus according to claim 1, wherein a sludge pump is disposed outside the bottom of the sludge storage tank, the sludge pump is provided with a pump-in pipeline and a pump-out pipeline, the pump-in pipeline is communicated with the bottom of the sludge storage tank, the pump-out pipeline is communicated with the mixing inlet pipeline, and the pump-out pipeline is provided with a sludge sampling port.
3. The apparatus according to claim 1 or 2, wherein the outlet end is provided with an outlet pipe, the outlet pipe is communicated with the mixing inlet pipe, and the outlet pipe is provided with a check valve.
4. The device for recycling sludge in the papermaking process according to claim 3, wherein a pipe float flowmeter is arranged on the dilution water pipeline, and an electromagnetic flowmeter is arranged on the chemical feeding pipeline.
5. The apparatus according to claim 4, wherein the vibrating screen is a high frequency vibrating screen or a pressure screen.
6. The apparatus of claim 5, wherein the sludge mixer is further provided with a blowoff valve, and the blowoff valve is communicated to the sludge conditioning unit.
7. The apparatus of claim 2, wherein the pump-out conduit is provided with a sludge flow meter.
8. The apparatus according to claim 7, wherein the mixing outlet pipe is provided with a sampling port.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021363317.9U CN212477266U (en) | 2020-07-13 | 2020-07-13 | Device for recycling sludge in papermaking process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021363317.9U CN212477266U (en) | 2020-07-13 | 2020-07-13 | Device for recycling sludge in papermaking process |
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| CN212477266U true CN212477266U (en) | 2021-02-05 |
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| CN202021363317.9U Active CN212477266U (en) | 2020-07-13 | 2020-07-13 | Device for recycling sludge in papermaking process |
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