CN112340920B - Treatment system and treatment method for papermaking sewage - Google Patents
Treatment system and treatment method for papermaking sewage Download PDFInfo
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- CN112340920B CN112340920B CN202011320597.XA CN202011320597A CN112340920B CN 112340920 B CN112340920 B CN 112340920B CN 202011320597 A CN202011320597 A CN 202011320597A CN 112340920 B CN112340920 B CN 112340920B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
- C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
Abstract
The invention discloses a papermaking sewage treatment system, which comprises a coagulation device, a first preheating device, a second preheating device and an evaporation wall reactor, wherein the coagulation device is arranged on the bottom of the first preheating device; the coagulation device comprises a coagulation barrel, a flocculation device for conveying a flocculating agent, and a separation device for separating floccule and liquid; the first preheating device is connected with the coagulation barrel and is used for collecting separated floccules and preheating the floccules; the second preheating device is connected with the separating device and is used for collecting the separated liquid and preheating the liquid; the evaporation wall reactor is respectively connected with the first preheating device and the second preheating device, and liquid is converted into supercritical fluid and then undergoes a water-gas reforming reaction with the floccule to generate combustible gas. The invention can purify the papermaking sewage and convert part of pollutants in the papermaking sewage into combustible gas, thereby realizing the recycling of resources.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a papermaking sewage treatment system and a papermaking sewage treatment method.
Background
In the chemical pulping and papermaking process, a large amount of waste water is generated. Because the raw materials for papermaking generally adopt coniferous trees or broad-leaved trees and contain a large amount of plant fibers, the papermaking sewage contains a large amount of lignin, cellulose, organic acids and other organic matters.
The pulping and papermaking industry is a large household for utilizing resources (raw materials, water, energy and the like) and is also a large household for discharging pollutants, and the current measures for controlling the papermaking sewage mainly comprise the following aspects: the method for preparing the materials is improved, needle-leaved wood, grass, bamboo and other raw materials are selected, the content of organic heteroatoms generated in papermaking sewage can be reduced, and the generated sewage still contains a large amount of lignin, cellulose and the like; and secondly, impurities, paper pulp fibers, suspended or colloidal organic pollutants and the like in the papermaking sewage are separated from the liquid through precipitation, the process is simple, but the time is long, the paper pulp fibers in the papermaking sewage cannot be well utilized, and the waste of resources is caused.
The invention patent with publication number CN108623073B discloses a method for recycling papermaking sewage generated in a waste paper pulping process, which reduces discharge amount and pollution by recycling the papermaking sewage in the waste paper pulp process, but pollutants contained in the sewage in the recycling process are inevitably accumulated to influence papermaking quality, the pollutants are not fundamentally treated, and pollution and resource waste are still caused.
The invention patent with publication number CN104671588B discloses a method for treating paper-making sewage, which decomposes cellulose contained in the paper-making sewage by adding cellulose decomposition bacteria, the treatment time is too long, the effective application to industrial production is difficult, and the product is glucose, and the recovery and utilization are difficult.
Therefore, a system and a method for performing evolutionary treatment on papermaking wastewater and recycling lignin and cellulose in pollutants are needed.
Disclosure of Invention
In order to solve the problems of treatment of papermaking sewage and difficulty in recycling pollutants, the invention provides a papermaking sewage treatment system, and the specific technical scheme is as follows.
A treatment system for papermaking wastewater, which comprises
The coagulation device comprises a coagulation barrel, a flocculation device for conveying a flocculating agent, and a separation device for separating floccules and liquid;
the first preheating device is connected with the coagulation barrel and used for collecting the separated floccules and preheating the floccules;
the second preheating device is connected with the separating device and is used for collecting the separated liquid and preheating the liquid;
the evaporation wall reactor comprises an outer cylinder, a first inner cylinder arranged in the outer cylinder, a second inner cylinder surrounding the first inner cylinder, a monitoring device and a driving device; the two ends of the outer barrel are respectively and fixedly connected with a first end cover and a second end cover, the first end cover is provided with a feed inlet connected with a first preheating device through a material pump and an alkaline raw material inlet used for adding alkaline raw materials, the second end cover is provided with a discharge outlet, the barrel wall of the outer barrel is provided with a liquid inlet connected with a second preheating device through a liquid booster pump, and a pipeline where the material pump is located and a pipeline where the liquid booster pump is located are respectively provided with an electric heater; the first inner cylinder is provided with a plurality of penetrating first holes, the inner side wall of the end part of the first inner cylinder is provided with a rack, the second inner cylinder is provided with a plurality of penetrating second holes, the first holes correspond to the second holes one by one, a liquid injection area is formed between the outer cylinder and the second inner cylinder, and a reaction area is formed on the inner side of the first inner cylinder; the monitoring device is used for monitoring the temperature in the reaction zone; the driving device comprises a driving motor connected with the first end cover or the second end cover, the driving motor is in transmission connection with a rack through a driving gear, and the driving motor drives the first inner cylinder and the second inner cylinder to rotate relatively according to the temperature in the reaction zone; the liquid is converted into the supercritical fluid by the electric heater, then enters the liquid injection zone, and then enters the reaction zone through the second hole and the first hole to react with the floccule to generate combustible gas.
Furthermore, the first inner cylinder comprises a first inner cylinder I section and a first inner cylinder II section, a first rack is arranged at one end, close to the first end cover, of the first inner cylinder I section, and a second rack is arranged at one end, close to the second end cover, of the first inner cylinder II section; the driving device comprises a first driving motor and a second driving motor, the first driving motor is in transmission connection with the first rack through a first driving gear, and the second driving motor is in transmission connection with the second rack through a second driving gear.
Further, the flocculation device comprises
The gas-powder mixer comprises a mixing chamber, a gas inlet mechanism and a powder inlet mechanism for conveying a flocculating agent, wherein a gas inlet connected with the gas inlet mechanism is formed in one axial end face of the mixing chamber, and a gas outlet is formed in the other axial end face of the mixing chamber; the powder feeding mechanism comprises a powder feeding pipeline and a dust raising pipeline, the powder feeding pipeline penetrates through the mixing chamber along the radial direction of the mixing chamber, the dust raising pipeline is sleeved outside the powder feeding pipeline and is rotatably connected with the powder feeding pipeline, the powder feeding pipeline is communicated with the dust raising pipeline, and dust raising holes which are uniformly distributed are formed in the outer side of the dust raising pipeline; the dust raising pipeline is driven by the gas conveyed by the gas inlet mechanism to rotate, so that the flocculating agent is fully mixed with the gas;
and one end of the aeration pipeline is connected with the gas outlet, the other end of the aeration pipeline is inserted into the coagulation barrel, and a first aeration hole for jetting air flow into the coagulation barrel is formed in the aeration pipeline.
Further, the separation device comprises a membrane tow, a confluence flange and a water suction pump; the membrane filament bundle comprises a plurality of hollow fiber membrane filaments, and a plurality of water absorption holes are formed in the fiber membrane filaments; one side of the confluence flange is provided with a plurality of confluence holes fixedly connected with the fiber membrane filaments, and the other side of the confluence flange is connected with a water suction pump, so that liquid in the fiber membrane filaments is converged to the water suction pump.
Furthermore, one end of the membrane tows, which is far away from the confluence flange, is fixedly connected with the gas-powder mixer, the aeration pipeline is parallel to the membrane tows, and part of the first aeration holes on the aeration pipeline jet airflow to the membrane tows.
Furthermore, at least two aeration pipelines are arranged on the outer side of the membrane tows, an elbow communicated with the adjacent aeration pipelines is arranged between the adjacent aeration pipelines, and a second aeration hole is formed in the elbow.
The invention also provides a method for treating the papermaking wastewater, and the specific technical scheme is as follows.
A method for treating papermaking sewage comprises the following steps:
s100, discharging papermaking sewage into a coagulation barrel, and adding a flocculating agent into the coagulation barrel to mix the flocculating agent with the papermaking sewage to form a mixture comprising floccules and liquid;
s200, separating the liquid from the floccules, preheating the liquid to 255-345 ℃, and pressurizing the liquid to 15-20 Mpa at the same time to keep the liquid state; preheating the floccule to 375-455 ℃;
s300, heating the preheated floccule again to 485-545 ℃, injecting the floccule into a reaction zone of the evaporation wall reactor, and adding an alkaline raw material into the reaction zone;
s400, pressurizing and heating the preheated liquid again, injecting the liquid into a liquid injection zone of the evaporation wall reactor, and pressurizing the liquid at the inlet of the liquid injection zone to 38-47 Mpa and heating the liquid to 535-720 ℃;
s500, allowing liquid in the liquid injection zone to permeate into the reaction zone to perform water-gas reforming reaction with the floccules to generate combustible gas;
and S600, collecting combustible gas.
Further, the step S100 of adding a flocculant into the coagulation tank to mix the flocculant with the papermaking wastewater includes:
s101, mixing a flocculating agent with gas to fully diffuse the flocculating agent in the gas;
s102, injecting gas mixed with a flocculating agent into a coagulation barrel in an aeration mode to fully mix the flocculating agent with the papermaking sewage;
the process of separating the liquid and the floe in the step S200 includes:
s201, a plurality of hollow fiber membrane filaments are gathered to form a membrane filament bundle, floccules and liquid are separated, then the liquid in the membrane filament bundle is collected through a water suction pump, and the floccules are precipitated to the bottom of a coagulation barrel;
s202, closing the water suction pump, and transferring floccules precipitated at the bottom of the coagulation tank;
during the aeration of step S102, a part of the gas is sprayed toward the membrane tow so that flocs adhering to the membrane tow are broken off.
Further, in the step S400, the liquid is injected into the liquid injection region through the upper liquid inlet and the lower liquid inlet respectively; the upper liquid inlet and the lower liquid inlet are sequentially and gradually far away from the inlet of the floccule, and the temperature of the entering liquid is sequentially and gradually increased.
Further, the temperature of the liquid entering the upper liquid inlet is 535-625 ℃; the temperature of the liquid entering the liquid discharging port is 655-720 ℃.
Has the beneficial effects that: 1. the invention discloses a papermaking sewage treatment system, which is characterized in that papermaking sewage is flocculated through a coagulation device, flocculated floccules and liquid are separated, the floccules and the liquid are preheated and then are input into an evaporation wall reactor, the liquid is converted into supercritical fluid, lignin, cellulose and the like generate combustible gas such as hydrogen, carbon monoxide and the like through water-gas reforming reaction by taking the supercritical fluid as a reaction medium, and organic acid and the like generate inorganic salt, so that the papermaking sewage is purified, and the lignin, the cellulose and the like are recycled.
2. The invention discloses a papermaking sewage treatment system.A vaporization wall reactor comprises a first inner cylinder and a second inner cylinder surrounding the first inner cylinder, and the first inner cylinder and the second inner cylinder can rotate relatively through a driving device, so that the overlapping area of a first hole and a second hole is adjusted, and the flow of fluid in a liquid injection area entering a reaction area can be adjusted; inorganic salt is generated in the reaction zone, and the higher the temperature is, the higher the precipitation rate of the inorganic salt is, a water film is formed on the surface of the first inner cylinder when the fluid enters the reaction zone through the first holes and the second holes, and the inorganic salt is prevented from being adhered to the first inner cylinder and blocking the first holes and the second holes through the water film. According to the monitored temperature in the reaction zone, the driving device is utilized to drive the first inner cylinder and the second inner cylinder to rotate relatively, and the overlapping area of the first hole and the second hole is changed, so that the flow entering the reaction zone is adjusted to adjust the water film, on one hand, inorganic salt is prevented from being separated out and adhered to the first inner cylinder, on the other hand, when the first inner cylinder and the second inner cylinder rotate relatively, the inorganic salt adhered to the first hole and the second hole is prevented from falling off due to the influence of the relative rotation, and the first hole and the second hole are further prevented from being blocked by the inorganic salt.
3. According to the papermaking sewage treatment system disclosed by the invention, the flocculation device comprises the air-powder mixer, firstly, the powdery flocculant is fully diffused into the air through the air-powder mixer, and then the air containing the flocculant enters the papermaking sewage through the aeration pipeline in an aeration mode, so that the flocculant is fully mixed with the papermaking sewage, and the time required by the flocculation process is reduced.
4. According to the papermaking sewage treatment system disclosed by the invention, floccules and liquid generated in the flocculation process are separated through the membrane silk bundles, the liquid is collected through the water suction pump and the confluence flange, and the floccules do not need to be separated after being naturally precipitated, so that the time is saved, and the working efficiency is improved; meanwhile, in the process of separating the floccules from the liquid, the gas is sprayed to the membrane tows through the aeration pipeline, so that the floccules adhered to the membrane tows can be effectively removed, and the separation efficiency is further accelerated.
5. The invention discloses a method for treating papermaking sewage, which comprises the steps of separating liquid from floccule, preheating the liquid and the floccule respectively, injecting the liquid and the floccule into a liquid injection zone and a reaction zone of an evaporation wall reactor respectively, enabling lignin and cellulose contained in the floccule to carry out a water-gas reforming reaction under the action of a supercritical fluid, generating combustible gases such as hydrogen, carbon monoxide and the like, converting organic acid into inorganic salt, further removing pollutants such as trace lignin, cellulose, organic acid and the like contained in the liquid, and improving the purification degree of the papermaking sewage.
6. The invention discloses a method for treating papermaking sewage, wherein liquid respectively enters a liquid injection zone through an upper liquid inlet and a lower liquid inlet, lignin and cellulose are firstly hydrolyzed to generate products such as sugar, ketone, fat and the like when passing through a reaction zone corresponding to the upper liquid inlet with relatively low temperature, and the sugar, ketone, fat and the like are decomposed into combustible gases such as carbon monoxide, hydrogen and the like after passing through the reaction zone corresponding to the lower liquid inlet with relatively high temperature, so that the efficiency of steam reforming is ensured.
Drawings
FIG. 1 is a schematic view of a processing system in an embodiment of the invention;
FIG. 2 is a schematic diagram of the structure of a vapor wall reactor in the embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a flocculation apparatus in an embodiment of the present invention;
FIG. 4 is a schematic view of the structure of the separation apparatus of the present invention;
FIG. 5 is a schematic view of the flocculation apparatus and the separation apparatus of the present invention;
FIG. 6 is a schematic view of the structure of the filter part of the gas separation device of the present invention;
FIG. 7 is a schematic view of the power generation section of the gas separation apparatus of the present invention;
fig. 8 is an enlarged schematic view of region a in fig. 2.
Reference numerals: 1-a coagulation barrel; 2-a flocculation device; 3-a separation device; 4-a first preheating device; 5-a second preheating device; 6-evaporation wall reactor; 7-a filtration section; 8-a power generation section; 9-a semiconductor refrigerator; 10-a gas-liquid separation tank; 21-an air intake mechanism; 22-a mixing chamber; 23-a powder inlet pipe; 24-a dust raising pipeline; 25-an aeration pipeline; 26-a first aeration hole; 31-a water suction pump; 32-film tow; 33-a sink flange; 41-material pump; 51-liquid booster pump; 52-electric heater; 61-a feed port; 62-alkaline feed inlet; 63-an outer barrel; 64-a first inner barrel; 65-a second inner barrel; 66-a liquid injection zone; 67-a reaction zone; 68-a drive means; 69-liquid inlet; 60-discharging port; 631-a first end cap; 632-a second end cap; 641-first inner cylinder section I; 642-second section of the first inner cylinder; 643 — a first aperture; 651-second hole; 691-an upper inlet; 692-lower inlet port; 71-a filter cylinder; 72-a filter element; 711-a first connection port; 712-a second connection port; 721-water baffle; 722-a rubber mesh drum; 81-a first impeller; 82-a second impeller; 83-a first cylinder; 84-a second cylinder; 85-a magnet; 86-a coil; 91-hot end; 92-cold end.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example 1
As shown in FIG. 1 and FIG. 2, the present embodiment discloses a system for treating papermaking wastewater, comprising
The coagulation device comprises a coagulation barrel 1, a flocculation device 2 for conveying a flocculating agent, and a separation device 3 for separating floccule and liquid;
the first preheating device 4 is connected with the coagulation barrel 1 and is used for collecting the separated floccules and preheating the floccules;
the second preheating device 5 is connected with the separating device 3 and is used for collecting the separated liquid and preheating the liquid;
a vaporization wall reactor 6 including an outer cylinder 63, a first inner cylinder 64 provided in the outer cylinder 63, a second inner cylinder 65 surrounding the first inner cylinder 64, a monitoring device, and a driving device 68; a first end cover 631 and a second end cover 632 are fixedly connected to two ends of the outer cylinder 63 respectively, a feed inlet 61 connected with the first preheating device 4 through a material pump 41 and an alkaline raw material inlet 62 for adding an alkaline raw material are formed in the first end cover 631, a discharge outlet 60 is formed in the second end cover 632, a liquid inlet 69 connected with the second preheating device 5 through a liquid booster pump 51 is formed in the wall of the outer cylinder 63, and electric heaters 52 are respectively arranged on a pipeline where the material pump 41 is located and a pipeline where the liquid booster pump 51 is located; the first inner cylinder 64 is provided with a plurality of first through holes 643, the inner side wall of the end part of the first inner cylinder is provided with a rack, the second inner cylinder 65 is provided with a plurality of second through holes 651, the first through holes 643 correspond to the second through holes 651 one by one, a liquid injection area 66 is formed between the outer cylinder 63 and the second inner cylinder 65, and the inner side of the first inner cylinder 64 is provided with a reaction area 67; the monitoring device is used to monitor the temperature within the reaction zone 67; the driving device 68 comprises a driving motor connected with the first end cover 631 or the second end cover 632, the driving motor is in transmission connection with a rack through a driving gear, and the driving motor drives the first inner cylinder 64 and the second inner cylinder 65 to rotate relatively according to the temperature in the reaction zone 67; the liquid is converted into the supercritical fluid by the electric heater 52, enters the liquid injection zone 66, and then enters the reaction zone 67 through the second hole 651 and the first hole 643 to react with the floccule to generate the combustible gas.
In this embodiment, the papermaking wastewater to be treated is poured into the coagulation tank 1, and then the flocculating agent is conveyed into the coagulation tank 1 through the flocculation device 2, so that the flocculating agent and the papermaking wastewater are fully mixed, and the adsorption and bridging effects of the high polymer are formed through the hydrolysis and polycondensation reactions of the flocculating agent, so that lignin, cellulose, organic acid and the like in the papermaking wastewater are adsorbed and coagulated to form floccules. Make the floccule and remaining liquid separation through separator 3 again, the floccule gets into and preheats in first preheating device 4, liquid gets into and preheats in second preheating device 5, the going on of the follow-up supercritical water gasification reaction of being convenient for. The preheated fluff is fed by the feed pump 41 into the reaction zone 67 of the evaporation wall reactor 6 and is heated by the electric heater 52 to 485 ℃ to 545 ℃ before entering the reaction zone 67. The preheated liquid is sent into a liquid injection zone 66 of the evaporation wall reactor 6 through a liquid booster pump 51, and is heated to 535-720 ℃ by an electric heater 52 before entering the liquid injection zone 66, and is boosted to 38-47 Mpa through the liquid booster pump 51. The liquid in infusion section 66 has now been converted to a supercritical fluid, which is a non-polar substance with high solubility and good transport properties, while the inorganic salts are much less soluble in the supercritical fluid than at ambient temperature and pressure. The supercritical fluid passes through the first inner cylinder 64 and the second inner cylinder 65 and then enters the reaction zone 67, and undergoes a water-gas reforming reaction with lignin and cellulose in the floc to form combustible gas such as carbon monoxide and hydrogen, heteroatoms such as Cl, S and P in the floc are converted into acid in the supercritical fluid, the alkaline raw material is added into the reaction zone 67 through the alkaline raw material inlet 62, so that the acid is formed into inorganic salt to be separated out in the supercritical fluid, and the supercritical fluid passes through the first holes 643 and the second holes 651 to form a water film, so that the separated inorganic salt is prevented from adhering to the wall of the first inner cylinder 64 and blocking the first holes 643 and the second holes 651. The reaction in reaction zone 67 can be broadly summarized as the following process:
lignin, cellulose + H 2 O→H 2 +CO
Hetero atom → acid, salt, oxide in organic compound
Acid + basic material → inorganic salt
Since the precipitation rate of inorganic salts in the supercritical fluid is increased along with the increase of the temperature, the monitoring device monitors the temperature change of the reaction zone 67, so as to control the driving device 68 to drive the first inner cylinder 64 and the second inner cylinder 65 to rotate relatively, so that the overlapping area of the first holes 643 and the second holes 651 is changed, the flow rate of the supercritical fluid entering the reaction zone 67 is adjusted, the water film is adjusted, the precipitated inorganic salts can be prevented from adhering to the first inner cylinder 64 to corrode the first inner cylinder 64 or block the first holes 643 and the second holes 651, and the reaction process in the reaction zone 67 is ensured; and simultaneously, the adhered inorganic salt can be further dropped off during the relative rotation of the first inner cylinder 64 and the second inner cylinder 65.
In this embodiment, as shown in fig. 2 and 8, the first inner cylinder 64 includes a first inner cylinder i section 641 and a first inner cylinder ii section 642, wherein a first rack is disposed at an end of the first inner cylinder i section 641 close to the first end cover 631, and a second rack is disposed at an end of the first inner cylinder ii section 642 close to the second end cover 632; the driving device 68 includes a first driving motor and a second driving motor, the first driving motor is connected with the first rack by a first driving gear in a transmission manner, and the second driving motor is connected with the second rack by a second driving gear in a transmission manner.
The reaction zone 67 is divided into two corresponding parts, namely an upper reaction zone 67 and a lower reaction zone 67, by arranging the two-stage first inner cylinder 64, the overlapping area of the first hole 643 and the second hole 651 can be adjusted by monitoring the temperature change in the upper reaction zone 67 so as to adjust the temperature change in the lower reaction zone 67, and thus the water film can be adjusted according to the temperatures of different reaction zones 67.
In this embodiment, the liquid inlet 69 is also divided into an upper inlet 691 and a lower inlet 692, and the upper inlet 691 and the lower inlet 692 gradually get away from the inlet 61 in turn, and gradually increase the temperature of the liquid entering in turn. The temperature of the liquid entering from the upper liquid inlet 691 is 535-625 ℃, and the temperature of the liquid entering from the lower liquid inlet 692 is 655-720 ℃.
When lignin, cellulose, etc. pass through the upper reaction zone 67, they are hydrolyzed into sugar, ketone, lipid, etc. and after the temperature in the lower reaction zone 67 is further raised, the sugar, ketone, lipid, etc. pass through the lower reaction zone 67 and are further decomposed into combustible gas such as hydrogen, carbon monoxide, etc. the reaction process is roughly as follows:
upper reaction zone 67: lignin, cellulose → CH n O m
Lower reaction zone 67: CH (CH) n O m +(1-m)H 2 O→(n/2+1-m)H 2 +CO
As shown in FIG. 3, in the present embodiment, the flocculation apparatus 2 comprises
The gas-powder mixer comprises a mixing chamber 22, a gas inlet mechanism 21 and a powder inlet mechanism for conveying a flocculating agent, wherein one axial end face of the mixing chamber 22 is provided with a gas inlet connected with the gas inlet mechanism 21, and the other axial end face of the mixing chamber is provided with a gas outlet; the powder feeding mechanism comprises a powder feeding pipeline 23 which penetrates through the mixing chamber 22 along the radial direction of the mixing chamber 22 and a dust raising pipeline 24 which is sleeved outside the powder feeding pipeline 23 and is rotatably connected with the powder feeding pipeline 23, the powder feeding pipeline 23 is communicated with the dust raising pipeline 24, and dust raising holes which are uniformly distributed are formed in the outer side of the dust raising pipeline 24; the dust raising pipeline 24 is driven to rotate by the gas conveyed by the gas inlet mechanism 21, so that the flocculating agent is fully mixed with the gas;
and one end of the aeration pipeline 25 is connected with the gas outlet, the other end of the aeration pipeline 25 is inserted into the coagulation barrel 1, and the aeration pipeline 25 is provided with a first aeration hole 26 for jetting air flow into the coagulation barrel 1.
In this embodiment, the flocculating agent is ground into powder, the powdered flocculating agent is conveyed into the powder inlet pipeline 23, the powder inlet pipeline 23 is communicated with the dust raising pipeline 24, the overlapped part of the powder inlet pipeline 23 and the dust raising pipeline 24 is arranged in a grid shape, dust raising holes which are uniformly distributed are arranged on the outer side of the dust raising pipeline 24, the gas inlet structure specifically comprises a gas inlet pump for inputting gas into the mixing chamber 22, the dust raising pipeline 24 is blown to rotate under the action of the gas inlet pump, so that the flocculating agent is diffused into the mixing chamber 22 along with the dust raising holes of the dust raising pipeline 24 to be mixed with the gas; meanwhile, under the action of the air intake pump, air mixed with the flocculating agent enters the coagulation barrel 1 through the first aeration hole 26 on the aeration pipeline 25, and the flocculating agent can be fully mixed with the papermaking sewage in the coagulation barrel 1 in an aeration mode, so that the time required by stirring is saved.
As shown in fig. 4, in the present embodiment, the separation device 3 includes a membrane tow 32, a confluence flange 33, and a suction pump 31; the membrane tows 32 comprise a plurality of hollow fiber membrane filaments, and a plurality of water absorption holes are formed in the fiber membrane filaments; one side of the confluence flange 33 is provided with a plurality of confluence holes fixedly connected with the fiber membrane filaments, and the other side of the confluence flange is connected with the water suction pump 31, so that the liquid in the fiber membrane filaments is converged to the water suction pump 31.
In this embodiment, the liquid in the coagulation tank 1 is absorbed by the membrane tow 32 to separate the flocs from the liquid, the liquid in the coagulation tank 1 is collected and transported to the second preheating device 5 by the water suction pump 31 under the action of the confluence flange 33, the flocs separated by the membrane tow 32 gradually settle to the bottom of the coagulation tank 1 as the liquid decreases, and after the flocs are substantially separated from the liquid, the water suction pump 31 is turned off to transfer the flocs into the first preheating device 4. The separating device 3 is matched with the flocculating device 2 for use, floccule and liquid can be separated without waiting for floccule precipitation, and in the subsequent evaporation wall reactor 6, the liquid converted into supercritical fluid can also be converted into combustible gas through water-gas reforming reaction by converting pollutants such as trace lignin, cellulose and the like which are not completely separated in the liquid, so that the purification of the papermaking sewage is fully completed.
In the embodiment, as shown in fig. 5, one end of the membrane bundle 32, which is far away from the confluence flange 33, is fixedly connected with a gas-powder mixer, the aeration pipe 25 is parallel to the membrane bundle 32, and a part of the first aeration holes 26 on the aeration pipe 25 sprays gas flow to the membrane bundle 32.
Specifically, four aeration pipelines 25 are arranged on the outer side of the membrane filament bundle 32, adjacent aeration pipelines 25 are connected through a bent pipe, a second aeration hole for injecting air flow to the membrane filament bundle 32 is arranged on the bent pipe, part of the first aeration hole 26 and the second aeration hole on the aeration pipeline 25 inject air flow to the membrane filament bundle 32 in the aeration process, the injected air flow impacts floccules attached to the membrane filament bundle 32, the membrane filament bundle 32 is prevented from being blocked by the floccules, and the efficiency of separating liquid from the floccules is ensured.
In the present embodiment, as shown in fig. 1, a gas separation device is further included; the gas separation device is connected with a discharge hole 60 and used for collecting fluid discharged after reaction of the evaporation wall reactor 6, and the gas separation device comprises a power generation part 8, a semiconductor refrigerator 9 and a gas-liquid separation tank 10;
as shown in fig. 7, the power generation unit 8 includes a first cylinder 83, a second cylinder 84 separated from the first cylinder 83, a first impeller 81, a second impeller 82, a magnet 85, and a coil 86, the first impeller 81 is disposed in the first cylinder 83, the second impeller 82 is disposed in the second cylinder 84, the first impeller 81 is in transmission connection with the second impeller 82, the magnet 85 is mounted on one end of each blade of the second impeller 82 close to the second cylinder 84, the coil 86 is disposed on the inner side wall of the second cylinder 84, and the first cylinder 83 is connected to the gas-liquid separation tank 10 through a delivery pipe; the fluid discharged after the reaction of the evaporation wall reactor 6 flows through the first cylinder 83 and is discharged into the gas-liquid separation tank 10, and simultaneously drives the first impeller 81 to rotate;
the semiconductor refrigerator 9 is connected with the coil 86 and is powered by the coil 86; the semiconductor refrigerator 9 comprises a cold end 92 and a hot end 91, wherein the cold end 92 is attached to the conveying pipeline for cooling the fluid in the conveying pipeline, and the hot end 91 is attached to the pipeline where the liquid booster pump 51 is located for assisting the electric heater 52 in heating.
In this embodiment, the supercritical fluid itself has a high pressure state, the first impeller 81 is driven to rotate during the flowing process, the first impeller 81 drives the second impeller 82 to rotate, so that the coil 86 and the magnet 85 rotate relatively, the electromagnetic induction phenomenon is used to generate an induced current in the coil 86, the semiconductor refrigerator 9 generates a hot end 91 and a cold end 92 under the condition of power supply of the coil 86 due to the peltier effect, the cold end 92 is attached to the delivery pipeline to cool the fluid in the delivery pipeline, the cooled fluid is converted into a liquid state from the supercritical state, wherein the solubility of hydrogen and carbon monoxide is reduced to be separated from the liquid in the gas-liquid separation tank 10, so as to realize separation of combustible gases such as hydrogen and carbon monoxide, and facilitate collection of the combustible gases. In the process, the energy is fully utilized, and the waste of energy is avoided.
As shown in fig. 6, the gas separation device further comprises a filtering part 7 for filtering inorganic salts, the filtering part 7 comprises a filtering cylinder 71 and a filter element 72, the filtering cylinder 71 comprises a first connecting port 711 detachably connected with the discharge port 60 of the evaporation wall reactor 6 and a second connecting port 712 detachably connected with the inlet end of the first cylinder 83, and the filter element 72 comprises a plurality of rubber net cylinders 722 and water baffles 721 close to the first connecting port 711 which are sleeved in sequence; one end of each of the rubber net cylinders 722 is connected to the water guard 721, and the other end is connected to the end wall of the filter cylinder 71 near the second connection port 712.
In this embodiment, the fluid reacted in the evaporation wall reactor 6 enters the filtering cylinder 71 through the first connection port 711, sequentially passes through the plurality of rubber mesh cylinders 722 to form multi-stage filtering, and then is discharged into the second outer cylinder 63 through the second connection port 712; the low solubility of inorganic salt in the supercritical fluid is utilized to make the inorganic salt adhere to the rubber mesh cylinder 722 and further purify the papermaking wastewater; the detachable connection of filter house 7 can be convenient for collect inorganic salt behind the filter house 7 of dismantling.
The treatment system for papermaking sewage provided by the embodiment can effectively purify the papermaking sewage, and avoids the discharge of the papermaking sewage from causing excessive pollution to the environment; meanwhile, lignin, cellulose and the like contained in the papermaking sewage are converted into combustible gas, so that the resource recycling is realized.
Example 2
The embodiment provides a method for treating papermaking wastewater, which comprises the following specific steps:
s100, discharging papermaking sewage into a coagulation barrel 1, adding a flocculating agent into the coagulation barrel 1 to mix the flocculating agent with the papermaking sewage to form a mixture comprising floccules and liquid;
s200, separating the liquid from the floccules, preheating the liquid to 255-345 ℃, and pressurizing the liquid to 15-20 Mpa to keep the liquid state; preheating the floccule to 375-455 ℃;
s300, reheating the preheated floccule to 485-545 ℃, injecting the floccule into a reaction zone 67 of the evaporation wall reactor 6, and adding an alkaline raw material into the reaction zone 67;
s400, pressurizing and heating the preheated liquid again, injecting the liquid into the liquid injection area 66 of the evaporation wall reactor 6, pressurizing the liquid at the inlet of the liquid injection area 66 to 38-47 Mpa, and heating to 535-720 ℃;
s500, allowing liquid in the liquid injection zone 66 to permeate into the reaction zone 67 to perform water-gas reforming reaction with the floccules to generate combustible gas;
s600, collecting combustible gas.
In the embodiment, lignin, cellulose and other pollutants in the papermaking sewage are flocculent through a flocculating agent, the flocculent and the liquid are separated, meanwhile, the flocculent and the liquid are preheated, and in the process of preheating the liquid, the liquid is pressurized to be kept in a liquid state; inputting the preheated floccule and liquid into the evaporation wall reactor 6, heating and pressurizing the floccule and the liquid again at the same time, so that the liquid is converted into supercritical fluid, the floccule generates a water-gas reforming reaction in the supercritical fluid, lignin and cellulose are converted into combustible gases such as hydrogen, carbon monoxide and the like, acid can be generated in a reaction zone 67 of the evaporation wall reactor 6, the papermaking wastewater also contains organic acid, acid substances are converted into inorganic salt by adding alkaline raw materials, and the inorganic salt is rapidly separated out by utilizing the low solubility of the inorganic salt in the supercritical fluid, thereby completing the full purification of the papermaking wastewater.
Specifically, in this embodiment, the process of adding the flocculant to the coagulation tank 1 in the step S100 to mix the flocculant with the papermaking wastewater includes:
s101, mixing a flocculating agent with gas to fully diffuse the flocculating agent in the gas;
s102, injecting the gas mixed with the flocculating agent into a coagulation barrel 1 in an aeration mode to fully mix the flocculating agent with the papermaking sewage;
the process of separating the liquid and the floccule in the step S200 includes:
s201, gathering a plurality of hollow fiber membrane yarns to form a membrane tow 32, separating floccules and liquid, and collecting the liquid in the membrane tow 32 through a water suction pump 31 to enable the floccules to be deposited to the bottom of a coagulation barrel 1;
s202, closing the water suction pump 31, and transferring floccules precipitated at the bottom of the coagulation barrel 1;
during aeration in step S102, a portion of the gas is sprayed toward the membrane tows 32 such that floes adhering to the membrane tows 32 fall off.
In this embodiment, the mode of adopting the aeration cooperates with the use of membrane silk bundle 32 for the flocculating agent can fully mix with papermaking sewage in aeration process, form flocculus and liquid and collect respectively, can make flocculus and liquid separate through membrane silk bundle 32, and aeration process can cooperate the liquid to collect the process and go on in step, has improved work efficiency, sprays the air current to membrane silk bundle 32 when simultaneously through the aeration, can prevent that the flocculus adhesion is on membrane silk bundle 32, prevents that the flocculus from blockking up membrane silk bundle 32.
Specifically, in this embodiment, in the step S400, the liquid is injected into the liquid injection zone 66 through the upper inlet 691 and the lower inlet 692 respectively; the upper inlet 691 and the lower inlet 692 are sequentially gradually distant from an inlet of the floc, and sequentially gradually increase the temperature of the liquid introduced.
The temperature of the liquid entering the upper liquid inlet 691 is 535-625 ℃; the temperature of the liquid entering the lower inlet port 692 is 655 ℃ to 720 ℃.
In this embodiment, the liquid enters the liquid injection region 66 through the upper inlet 691 and the lower inlet 692, when the lignin and the cellulose pass through the reaction region 67 corresponding to the upper inlet 691 with relatively low temperature, the lignin and the cellulose are hydrolyzed to generate products such as sugar, ketone, and ester, and the sugar, ketone, and ester are decomposed into combustible gases such as carbon monoxide and hydrogen after passing through the reaction region 67 corresponding to the lower inlet 692 with relatively high temperature, thereby ensuring the efficiency of water-gas reforming.
The method for treating papermaking sewage provided by the embodiment can effectively purify the papermaking sewage, and avoids the discharge of the papermaking sewage from causing excessive pollution to the environment; meanwhile, lignin, cellulose and the like contained in the papermaking sewage are converted into combustible gas, so that the resource recycling is realized.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The utility model provides a processing system of papermaking sewage which characterized in that: comprises that
The coagulation device comprises a coagulation barrel (1), a flocculation device (2) for conveying a flocculating agent, and a separation device (3) for separating floccule and liquid;
the first preheating device (4) is connected with the coagulation barrel (1) and is used for collecting separated floccules and preheating the floccules;
the second preheating device (5) is connected with the separating device (3) and is used for collecting the separated liquid and preheating the liquid;
the evaporation wall reactor (6) comprises an outer cylinder (63), a first inner cylinder (64) arranged in the outer cylinder (63), a second inner cylinder (65) surrounding the first inner cylinder (64), a monitoring device and a driving device (68); a first end cover (631) and a second end cover (632) are fixedly connected to two ends of the outer cylinder (63) respectively, a feed inlet (61) connected with the first preheating device (4) through a material pump (41) and an alkaline raw material inlet (62) used for adding alkaline raw materials are formed in the first end cover (631), a discharge outlet (60) is formed in the second end cover (632), a liquid inlet (69) connected with the second preheating device (5) through a liquid booster pump (51) is formed in the cylinder wall of the outer cylinder (63), and electric heaters (52) are arranged on a pipeline where the material pump (41) is located and a pipeline where the liquid booster pump (51) is located respectively; the first inner cylinder (64) is provided with a plurality of penetrating first holes (643), the inner side wall of the end part of the first inner cylinder is provided with a rack, the second inner cylinder (65) is provided with a plurality of penetrating second holes (651), the first holes (643) correspond to the second holes (651) in a one-to-one mode, a liquid injection area (66) is formed between the outer cylinder (63) and the second inner cylinder (65), and a reaction area (67) is formed inside the first inner cylinder (64); the monitoring device is used for monitoring the temperature in the reaction zone (67); the driving device (68) comprises a driving motor connected with the first end cover (631) or the second end cover (632), the driving motor is in transmission connection with a rack through a driving gear, and the driving motor drives the first inner cylinder (64) and the second inner cylinder (65) to rotate relatively according to the temperature in the reaction zone (67); the liquid is converted into supercritical fluid through an electric heater (52) and a liquid booster pump (51), then enters a liquid injection zone (66), and then enters a reaction zone (67) through a second hole (651) and a first hole (643) to react with the floccule to generate combustible gas;
also comprises a gas separation device; the gas separation device is connected with the discharge hole (60) and used for collecting fluid discharged after the reaction of the evaporation wall reactor (6); the gas separation device comprises a power generation part (8), a semiconductor refrigerator (9) and a gas-liquid separation tank (10);
the power generation part (8) comprises a first cylinder (83), a second cylinder (84) separated from the first cylinder (83), a first impeller (81), a second impeller (82), a magnet (85) and a coil (86), wherein the first impeller (81) is arranged in the first cylinder (83), the second impeller (82) is arranged in the second cylinder (84), the first impeller (81) is in transmission connection with the second impeller (82), the magnet (85) is arranged at one end, close to the second cylinder (84), of each blade of the second impeller (82), the coil (86) is arranged on the inner side wall of the second cylinder (84), and the first cylinder (83) is connected with the gas-liquid separation tank (10) through a conveying pipeline; fluid discharged after the reaction of the evaporation wall reactor (6) flows through the first cylinder (83) and is discharged into the gas-liquid separation tank (10), and simultaneously drives the first impeller (81) to rotate;
the semiconductor refrigerator (9) is connected with the coil (86) and is powered by the coil (86); the semiconductor refrigerator (9) comprises a cold end (92) and a hot end (91), wherein the cold end (92) is attached to the conveying pipeline and used for cooling fluid in the conveying pipeline, and the hot end (91) is attached to a pipeline where the liquid booster pump (51) is located and used for heating the auxiliary electric heater (52).
2. The system for treating papermaking wastewater according to claim 1, wherein: the first inner cylinder (64) comprises a first inner cylinder I section (641) and a first inner cylinder II section (642), a first rack is arranged at one end, close to the first end cover (631), of the first inner cylinder I section (641), and a second rack is arranged at one end, close to the second end cover (632), of the first inner cylinder II section (642); the driving device (68) comprises a first driving motor and a second driving motor, the first driving motor is in transmission connection with the first rack through a first driving gear, and the second driving motor is in transmission connection with the second rack through a second driving gear.
3. The system for treating papermaking wastewater according to claim 1, wherein: the flocculation device (2) comprises
The gas-powder mixer comprises a mixing chamber (22), a gas inlet mechanism (21) and a powder inlet mechanism for conveying a flocculating agent, wherein a gas inlet connected with the gas inlet mechanism (21) is formed in one axial end face of the mixing chamber (22), and a gas outlet is formed in the other axial end face of the mixing chamber; the powder feeding mechanism comprises a powder feeding pipeline (23) which radially penetrates through the mixing chamber (22) along the mixing chamber (22) and a dust raising pipeline (24) which is sleeved outside the powder feeding pipeline (23) and is rotatably connected with the powder feeding pipeline (23), the powder feeding pipeline (23) is communicated with the dust raising pipeline (24), and dust raising holes which are uniformly distributed are formed in the outer side of the dust raising pipeline (24); the dust raising pipeline (24) is pushed by the gas conveyed by the gas inlet mechanism (21) to rotate, so that the flocculating agent is fully mixed with the gas;
the aeration pipeline (25), one end of the aeration pipeline (25) is connected with the gas outlet, the other end is inserted into the coagulation barrel (1), and a first aeration hole (26) for spraying air flow into the coagulation barrel (1) is formed in the aeration pipeline (25).
4. The system for treating papermaking wastewater according to claim 3, wherein: the separation device (3) comprises a membrane tow (32), a confluence flange (33) and a water suction pump (31); the membrane tows (32) comprise a plurality of hollow fiber membrane yarns, and a plurality of water absorption holes are formed in the fiber membrane yarns; one side of the confluence flange (33) is provided with a plurality of confluence holes fixedly connected with the fiber membrane wires, the other side of the confluence flange is connected with the water suction pump (31), and liquid in the fiber membrane wires is converged to the water suction pump (31).
5. The system for treating papermaking wastewater according to claim 4, wherein: one end of the membrane tows (32) far away from the confluence flange (33) is fixedly connected with an air-powder mixer, the aeration pipeline (25) is parallel to the membrane tows (32), and part of the first aeration holes (26) on the aeration pipeline (25) spray air flow to the membrane tows (32).
6. The system for treating papermaking wastewater according to claim 5, wherein: the membrane bundle aeration device is characterized in that at least two aeration pipelines (25) are arranged on the outer side of the membrane bundle (32), communicated bent pipes are arranged between every two adjacent aeration pipelines (25), and second aeration holes are formed in the bent pipes.
7. A method for treating papermaking wastewater by using the treatment system of any one of claims 1 to 6, comprising the steps of:
s100, discharging papermaking sewage into a coagulation barrel (1), adding a flocculating agent into the coagulation barrel (1) to mix the flocculating agent with the papermaking sewage to form a mixture comprising floccules and liquid;
s200, separating the liquid from the floccules, preheating the liquid to 255-345 ℃, and pressurizing the liquid to 15-20 Mpa at the same time to keep the liquid state; preheating the floccule to 375-455 ℃;
s300, heating the preheated floccule again to 485-545 ℃, injecting the floccule into a reaction zone (67) of the evaporation wall reactor (6), and adding an alkaline raw material into the reaction zone (67) at the same time;
s400, pressurizing and heating the preheated liquid again, injecting the liquid into a liquid injection zone (66) of the evaporation wall reactor (6), and pressurizing the liquid at the inlet of the liquid injection zone (66) to 38-47 Mpa and heating to 535-720 ℃;
s500, liquid in the liquid injection zone (66) permeates into the reaction zone (67) to carry out water-gas reforming reaction with the floccule to generate combustible gas;
and S600, collecting combustible gas.
8. The method for treating papermaking wastewater according to claim 7, wherein the step S100 of adding a flocculant into the coagulation tank (1) to mix the flocculant with the papermaking wastewater comprises:
s101, mixing a flocculating agent with gas to fully diffuse the flocculating agent in the gas;
s102, injecting gas mixed with a flocculating agent into a coagulation barrel (1) in an aeration mode to fully mix the flocculating agent with the papermaking sewage;
the process of separating the liquid and the floe in the step S200 includes:
s201, gathering a plurality of hollow fiber membrane yarns to form a membrane tow (32) and separating floccules and liquid, and then collecting the liquid in the membrane tow (32) through a water suction pump (31) to enable the floccules to be precipitated to the bottom of a coagulation barrel (1);
s202, closing the water suction pump (31) and transferring floccules precipitated at the bottom of the coagulation barrel (1);
during the aeration of step S102, a portion of the gas is sprayed toward the membrane tows (32) so that flocs adhering to the membrane tows (32) fall off.
9. The method for treating papermaking wastewater according to claim 7, wherein the liquid is injected into the liquid injection zone (66) through the upper inlet (691) and the lower inlet (692) in step S400; the upper liquid inlet (691) and the lower liquid inlet (692) are sequentially and gradually far away from the inlet of the floccule, and the temperature of the entering liquid is sequentially and gradually increased.
10. The method for treating papermaking wastewater according to claim 9, wherein the temperature of the liquid entering from the upper inlet (691) is 535-625 ℃; the temperature of the liquid entering the lower liquid inlet (692) is 655 ℃ to 720 ℃.
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