CN111533377A - High-concentration phenolic resin wastewater recycling treatment system and process - Google Patents
High-concentration phenolic resin wastewater recycling treatment system and process Download PDFInfo
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Abstract
The invention discloses a high-concentration phenolic resin wastewater recycling treatment system and a high-concentration phenolic resin wastewater recycling treatment process, and belongs to the technical field of industrial wastewater treatment. The device mainly comprises a temporary waste water storage tank, a heat exchanger, a reactor, a flow buffering element, a gas-liquid separator, a temporary recycled water storage tank and an intelligent control element. The high-concentration phenolic resin wastewater enters a reactor after multi-stage heat exchange, and organic matters in the wastewater can be decomposed and reformed into CH in 10-15min under the action of a catalyst4The COD removal rate of the product with equal added value is up to more than 99.5 percent, and the product has CH4The yield is as high as 98%. In a word, the invention provides a new system and a new process for recycling high-concentration phenolic resin wastewater, and the system and the process have the advantages of good treatment effect, safety, reliability, high automation degree, energy and water conservation, high recycling degree and the like, and have good industrial application prospects.
Description
Technical Field
The invention belongs to the technical field of industrial wastewater treatment, and particularly relates to a high-concentration phenolic resin wastewater recycling treatment system and process.
Background
Phenolic resin is a polycondensate synthesized from phenols and aldehydes under the action of an acid or alkali catalyst, and is widely applied to industrial production of coatings, electric insulating materials, grinding wheel and abrasive cloth binders and the like due to unique high-temperature resistance and good insulating property. However, a large amount of high-concentration waste water containing high concentrations of phenol and aldehyde and a part of low molecular weight phenol resin and toxic substances such as acetic acid are inevitably generated in the production process of the phenol resin. The direct discharge of the waste water not only pollutes and destroys the surrounding ecological environment, but also harms the health of people. Therefore, how to effectively treat the high-concentration wastewater becomes a key for green sustainable development of the phenolic resin industry.
In a plurality of high-concentration phenolic resin wastewater treatment processes, a physical method represented by an extraction method, an adsorption method, a gas stripping method or a membrane method is concerned about recycling various substances in wastewater, however, the components of the phenolic resin wastewater are complex, and the physicochemical property difference of the components is not large, so that the recycling difficulty and the cost are increased, and the industrial application of the method is limited to a certain extent. Chemical methods such as a chemical oxidation method, a catalytic wet oxidation method, a sonochemical oxidation method, a photochemical oxidation method, an electrochemical oxidation method and the like have the advantages of high reaction speed, good treatment effect, no secondary pollution and the like, and the methods are essentially used for converting organic matters in wastewater into carbon dioxide and water, so that the discharge amount of the carbon dioxide is increased undoubtedly, and potential resources such as the organic matters in the wastewater are not fully utilized. In addition, these chemical methods also have a common problem of high treatment cost. From the perspective of industrial application, the method has application prospect and market competition for a technology which can effectively treat toxic and harmful substances in the wastewater and can generate high value-added products. The catalytic hydrothermal gasification technology is a novel technology which integrates a water-heating gasification technology and a catalytic oxidation technology, utilizes the special properties of water at a high temperature and a high pressure state and a catalyst to reduce activation energy and specific selectivity, and quickly and selectively decomposes organic matters into gaseous clean energy or harmless gas at a low temperature, and has the advantages of high efficiency, energy conservation, resource utilization and the like. However, no report on the treatment of high-concentration phenolic resin organic wastewater by adopting the technology is available at present. Therefore, aiming at the characteristics of the high-concentration phenolic resin wastewater and the market demand and combining the advantages of the catalytic hydrothermal gasification technology, the development of the high-concentration phenolic resin wastewater resource treatment system and process which are good in treatment effect, safe, reliable and high in automation degree has important significance.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a high-concentration phenolic resin wastewater recycling treatment system and process with good treatment effect, safety, reliability and high automation degree.
The technical scheme of the invention is as follows: a high-concentration phenolic resin wastewater recycling treatment system mainly comprises a wastewater temporary storage tank, a heat exchanger, a reactor, a gas-liquid separator, a reuse water temporary storage tank, an intelligent control element and a power supply, wherein the wastewater temporary storage tank is internally provided with a filtering device;
the heat exchangers are multiple and are connected in sequence;
the three reactors are respectively a first reactor, a second reactor and a third reactor, the first reactor and the second reactor are connected in parallel and are respectively connected with a heat exchanger positioned at the tail end, the third reactor is respectively connected with the first reactor and the second reactor, and the products treated by the first reactor and the second reactor are mixed;
the intelligent control element comprises a controller for controlling each electrical element to normally operate, a wireless communication module, a remote controller connected with the wireless communication module and the controller, a display screen for displaying the working condition of each electrical element, and an alarm for alarming fault states.
Furthermore, the filtering equipment comprises a plurality of filtering nets, a plurality of plugging plates and a plurality of folding connecting plates, wherein the filtering nets are horizontally arranged in the wastewater temporary storage tank from top to bottom, the mesh number of the filtering nets is gradually increased, the plugging plates are arranged at two ends of the side wall of the wastewater temporary storage tank and are positioned at the positions of the filtering nets, the folding connecting plates are used for connecting the filtering nets and the wastewater temporary storage tank, each filtering net is formed by splicing two filtering subnets, one sides of the two filtering subnets are rotatably connected, the other sides of the two filtering subnets are rotatably connected with the folding connecting plates respectively, the gravity sensors are arranged on the filtering subnets, the folding connecting plates are driven by a motor to be folded by the motor, the two filtering subnets rotatably connected with the folding connecting plates are close to each other, the two filtering subnets are close to each other to form an inclined, make rather than rotating two filtration subnetworks of being connected and keep away from each other, two filtration subnetworks form the horizontal plane, filter the solid in the waste water, whole process need not the staff and salvages and clear up, labour saving and time saving, and the filter screen that increases gradually through three mesh filters the solid impurity of the different particle diameters in the waste water layer by layer, increase the filter effect, avoid filtering thoroughly, make in partial solid impurity gets into the heat exchanger, make its inside corruption or jam, reduce life.
Further, the jar is kept in to waste water and the reuse water is kept in and all is equipped with the level gauge on the jar, the level gauge detects the liquid level of co-altitude through three level gauge for detecting first level gauge, second level gauge and the third level gauge of different liquid level height, when the liquid level is higher than the highest liquid level or is less than minimum liquid level, the start-up or the stop of control drawing liquid pump make the waste water treatment efficiency of device reach the best, shorten waste water treatment time.
Furthermore, the first reactor, the second reactor and the third reactor are respectively provided with a remote thermometer, a remote pressure gauge, a safety valve and a high pressure resistant condensation discharging valve, a heating system and a water distribution device are arranged in the first reactor, the second reactor and the third reactor, the reaction temperature in each reactor is detected through the remote thermometer, when the temperature is lower than 280 ℃, the reactor is heated through the heating system, when the temperature is higher than 350 ℃, the heating is stopped through the heating system, so that the temperature is ensured to be between 280 ℃ and 350 ℃, the COD decomposition effect of the catalyst on the wastewater is optimal, the pressure in the reactor is detected through the remote pressure gauge, then the safety valve is matched for adjustment, the internal pressure of the whole reactor is moderate, unsafe accidents are avoided, the condensed water in the reactor and the catalyst deposited in the reactor are discharged through the high pressure resistant condensation discharging valve, the remote thermometer and the remote pressure gauge 34 are commercially available.
Furthermore, the flow buffering element between the heat exchanger and the reactor comprises a buffering groove which is connected with the first reactor through a connecting pipe and is provided with a water outlet connector on the side wall, and a flow limiting shell arranged at the water outlet connector, wherein the flow limiting shell is provided with a water outlet connected with the first reactor, a buffering air bag opposite to the water outlet connector is arranged in the flow limiting shell, the front side of the buffering air bag is connected with a T-shaped sliding rod which can slide left and right in the flow limiting shell, the rear side of the buffering air bag is provided with a suction port, the rear side of the flow limiting shell is buckled with a connecting rear cover provided with a filter screen on the side wall, the water temperature is maintained at a stable level after heat exchange of the heat exchanger, liquid enters the buffering groove through the water outlet connector to buffer and eliminate partial impact force, and then enters the flow limiting shell through the water outlet connector, and at the moment, partial water flow, increase current-limiting casing inner chamber volume to reduce the pressure when the delivery port is discharged, after the rivers discharge, the buffering gasbag resumes free state, weaken the impact force of rivers through setting up flow buffering component, avoid the rivers impact force to make reactor internal component damage, the life of reactor has been prolonged, and simultaneously, replace current spring buffering component through the buffering gasbag, avoided the spring live time long, lose elasticity easily and the problem of damage, moreover, the steam generator is simple in structure, and convenient operation.
Further, delivery port department is equipped with the ring that expands that is connected with first reactor, expand the ring inner wall that expands and be equipped with a plurality of buffering vertical bars along circumference, and adjacent two form the dashpot between the buffering vertical bar, through expanding the water diffusion that the ring flows the delivery port, and flow to first reactor along each dashpot, reduced the impact force to first reactor of rivers, the life of extension reactor.
Furthermore, the side wall of the wastewater temporary storage tank is provided with a fixing frame at the bottom end of each filter screen, the front side wall and the rear side wall of the fixing frame are provided with sliding grooves, the front side wall and the rear side wall of the folding connecting plate are provided with sliding beads capable of sliding in the sliding grooves, the front side wall and the rear side wall of the two filter subnets are abutted against the side wall of the fixing frame, the filter equipment is arranged at the upper end of the fixing frame through the fixing frame, the bearing capacity of the filter screens is increased.
The treatment process of the high-concentration phenolic resin wastewater recycling treatment system comprises the following steps:
(1) firstly, high-concentration waste water generated in the production of phenolic resin enters a waste water temporary storage tank, the waste water is filtered by a plurality of filter screens with different mesh numbers to remove solid impurities with different particle sizes in the waste water, the waste water is aerated and fully reacted with activated sludge through the waste water temporary storage tank to remove organic pollutants in the high-concentration waste water, when the waste water enters the waste water temporary storage tank, liquid levels with different heights in the waste water temporary storage tank are detected through a first liquid level meter, a second liquid level meter and a third liquid level meter, when the first liquid level meter detects that the liquid level in the waste water temporary storage tank is lower than the lowest preset liquid level, a signal is sent to a controller, the controller controls a liquid pump to be closed, when the second liquid level meter detects that the liquid level is lower than the preset value, the controller controls an alarm to give an alarm to warn workers to find the liquid level in time, when the, warning staff to stop adding wastewater into the wastewater temporary storage tank;
(2) pumping the filtered wastewater into a heat exchanger positioned at the foremost end through a liquid pump, then sequentially passing through each heat exchanger, exchanging heat of the wastewater by using cooling water in the heat exchanger, and then recovering heat energy of the cooling water by using external equipment;
(3) after heat exchange by the heat exchanger, the water temperature is maintained at a stable level, liquid enters the buffer groove through the water outlet connector to be buffered and eliminate partial impact force, and then enters the flow limiting shell through the water outlet connector, at the moment, partial water flow impacts the T-shaped slide bar to compress the buffering air bag and increase the volume of the inner cavity of the flow limiting shell, so that the pressure when the liquid is discharged through the water outlet is reduced, and the buffering air bag is restored to a free state after the water flow is discharged;
(4) finally, discharging the liquid after heat exchange treatment from a water outlet to each reactor, wherein organic wastewater is uniformly distributed on a catalyst packing layer through a water distribution device in the first reactor, organic substances in the wastewater are decomposed under the action of a catalyst, in order to avoid exceeding standard of effluent, the undecomposed organic substances in the reaction product of the first reactor can be decomposed by using a third reactor, and when the sewage treatment capacity is large, the first reactor and the second reactor are started to treat simultaneously, so that the sewage treatment process is increased;
(5) and the gas-liquid mixture after heat exchange enters a gas-liquid separator, the separated gas enters an external subsequent treatment device through the top of the gas-liquid separator, and the liquid enters a reuse water temporary storage tank from the bottom end of the gas-liquid separator and is used for the production process of the phenolic resin.
The invention has the beneficial effects that: the invention provides a high-concentration phenolic resin wastewater recycling treatment system and a process, which have the following advantages:
(1) the invention carries out multi-stage heat exchange decomposition on the high-concentration wastewater containing the phenolic resin, so that the temperature of the wastewater after heat exchange is maintained at a stable level, meanwhile, the temperature in each reactor is regulated in real time, the reaction temperature is always kept between 280 ℃ and 350 ℃, COD in the wastewater can be decomposed by more than 99.5 percent within 5 to 15 minutes under the action of a catalyst, the reaction temperature is reduced by using the catalyst, a two-stage heat exchanger is arranged to recycle the heat of generated gas, the organic matters in the phenolic resin wastewater are converted into resource substances such as methane and the like, and the methane yield is more than 98 percent.
(2) The invention applies the heat carried by the gas generated by the reaction to the preheating process of the high-concentration phenolic resin wastewater by arranging the multistage heat exchange reactor, thereby greatly reducing the energy consumption required by the treatment process, simultaneously greatly improving the purity and quality of high value-added products such as methane and the like after the gas and part of liquid are separated by the gas-liquid separator after heat exchange, and simultaneously the generated water can be applied to the production process again.
(3) The invention adopts a system formed by connecting a first reactor and a second reactor in parallel and a second reactor (a third reactor) in series, can effectively avoid the problem of excessive effluent caused by aging of the catalyst of the first reactor or sudden increase of the concentration of organic matters in wastewater, and can select the number of reactors in the first reactor to be started according to the discharge amount of wastewater in the actual operation process, thereby greatly saving the operation cost and slowing down the aging rate of equipment and the catalyst.
(4) The invention weakens the impact force of water flow by arranging the flow buffering element, avoids the damage of the inner elements of the reactor caused by the impact force of the water flow, prolongs the service life of the reactor, simultaneously, replaces the existing spring buffering element by the buffering air bag, avoids the problems of long service time of the spring and easy damage caused by the loss of elasticity, and has simple structure and convenient operation.
(5) According to the invention, the solid impurities with different particle sizes in the wastewater are fully filtered by arranging the plurality of filter screens with sequentially increased meshes, so that the impurities are prevented from flowing into the heat exchanger to cause corrosion or blockage in the heat exchanger, the service life is reduced, meanwhile, the solid impurities can be automatically dumped according to the weight of the solid impurities on the filter screens, the whole process does not need manual salvage and cleaning by workers, the automation degree is high, and complex operation is not needed.
(6) According to the invention, by arranging the intelligent control element, the whole system can automatically operate without manual complex operation, the automation degree is high, meanwhile, the operation working conditions of each electrical element can be monitored in real time, faults can be found in time, the threat of fault amplification to the stability of the whole system is avoided, and the intelligent control system is safe and reliable and is suitable for popularization.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the folded web of the present invention when folded;
FIG. 3 is an enlarged view of the invention at A in FIG. 2;
FIG. 4 is a schematic view of the folded web of the present invention when unfolded;
FIG. 5 is an enlarged view of the invention at B in FIG. 4;
FIG. 6 is a schematic view of the structure of the flow buffering element of the present invention;
FIG. 7 is a schematic structural view of a water-spreading ring of the present invention;
fig. 8 is an electrical connection diagram of the present invention.
Wherein, 1-a temporary wastewater storage tank, 10-a filtering device, 100-a filter screen, 1000-a filter subnet, 1001-a gravity sensor, 101-a plugging plate, 102-a folding connecting plate, 1020-a sliding bead, 11-a fixed frame, 110-a sliding groove, 2-a heat exchanger, 20-a liquid pump, 21-an electromagnetic flowmeter, 3-a reactor, 30-a first reactor, 31-a second reactor, 32-a third reactor, 33-a remote thermometer, 34-a remote pressure gauge, 35-a safety valve, 36-a high pressure resistant condensate discharging valve, 4-a gas-liquid separator, 5-a temporary recycled water storage tank, 6-an intelligent control element, 60-a controller, 61-a water quality detector, 62-a wireless communication module, 63-a remote controller, 64-display screen, 65-alarm, 7-liquid level meter, 70-first liquid level meter, 71-second liquid level meter, 72-third liquid level meter, 8-flow buffer element, 80-buffer tank, 800-water outlet connector, 81-flow limiting shell, 810-water outlet, 8100-water expansion ring, 8101-buffer vertical bar, 8102-buffer tank, 811-buffer air bag, 8110-suction port, 812-T type slide bar, 813-connection rear cover and 8130-filter screen.
Detailed Description
Example (b): as shown in fig. 1, a high concentration phenolic resin wastewater recycling treatment system mainly comprises a wastewater temporary storage tank 1 provided with a filtering device 10 inside, a heat exchanger 2 connected with the wastewater temporary storage tank 1 and provided with a liquid pump 20 and an electromagnetic flow meter 21 at the joint, a reactor 3 connected with the heat exchanger 2, a gas-liquid separator 4 for separating a gas-liquid mixture subjected to heat exchange treatment by the heat exchanger 2, a reuse water temporary storage tank 5 for temporarily storing liquid separated by the gas-liquid separator 4, an intelligent control element 6, and a power supply electrically connected with each electrical element;
as shown in fig. 2 and 4, the filtering apparatus 10 comprises three filtering nets 100 horizontally arranged in the wastewater temporary storage tank 1 from top to bottom and having gradually increasing mesh number, six plugging plates 101 arranged at two ends of the sidewall of the wastewater temporary storage tank 1 and located at each filtering net 100, and six folding connecting plates 102 for connecting the filtering nets 100 and the wastewater temporary storage tank 1, wherein each filtering net 100 is formed by splicing two filtering subnets 1000, one side of each filtering subnetwork 100 is rotatably connected, the other side of each filtering subnetwork 100 is rotatably connected with the folding connecting plate 102, the filtering subnetwork 1000 is provided with a gravity sensor, the folding connecting plate 102 is driven by a motor 1001, the folding connecting plate 102 is driven by the motor to fold, so that the two filtering subnets 1000 rotatably connected therewith are close to each other, the two filtering subnets 1000 are close to each other to form an inclined plane, so that solid impurities are scattered from two sides of the two filtering subnets 1000, after dumping is finished, the motor drives the folding connecting plate 102 to be unfolded, so that the two filter subnets 1000 which are rotatably connected with the folding connecting plate are far away from each other, the two filter subnets 1000 form a horizontal plane to filter solids in the wastewater, manual salvaging and cleaning by workers are not needed in the whole process, time and labor are saved, solid impurities with different particle sizes in the wastewater are filtered layer by layer through the three filter screens 100 with gradually increased mesh numbers, the filtering effect is improved, incomplete filtering is avoided, partial solid impurities enter the heat exchanger 2, the interior of the heat exchanger is corroded or blocked, the service life is shortened, as shown in figures 3 and 5, the side wall of the wastewater temporary storage tank 1 and the bottom ends of the filter screens 100 are provided with fixed frames 11, the front side wall and the rear side wall of each fixed frame 11 are provided with sliding grooves 110, the front side wall and the rear side wall of the folding connecting plate 102 are provided with sliding beads 1020 which, the filter device 10 is arranged at the upper end of the filter screen 100 through the fixing frame 11, so that the bearing capacity of the filter screen 100 is improved, the filter screen 100 is prevented from being damaged when water flow impacts greatly, and the service life of the device is prolonged;
the number of the heat exchangers 2 is two, and the two heat exchangers 2 are connected in sequence;
the three reactors 3 are respectively a first reactor 30, a second reactor 31 and a third reactor 32, the first reactor 30 and the second reactor 31 are connected in parallel and are respectively connected with the heat exchanger 2 positioned at the tail end, the third reactor 32 is respectively connected with the first reactor 30 and the second reactor 31 and is used for mixing the products processed by the first reactor 30 and the second reactor 31, the first reactor 30, the second reactor 31 and the third reactor 32 are respectively provided with a remote thermometer 33, a remote pressure gauge 34, a safety valve 35 and a high pressure resistant condensation discharge valve 36, the first reactor 30, the second reactor 31 and the third reactor 32 are respectively provided with a heating system and a water distribution device, the reaction temperature in each reactor 3 is detected through the remote thermometer 33, when the temperature is lower than 280 ℃, the reactors 3 are heated through the heating system, when the temperature is higher than 350 ℃, the heating system stops heating, so that the temperature is ensured to be between 280 and 350 ℃, the COD decomposition effect of the catalyst on the wastewater is enabled to reach the best, the pressure in the reactor 3 is detected through the remote pressure gauge 34, then the safety valve 35 is matched for adjustment, the pressure in the whole reactor 3 is moderate, unsafe accidents are avoided, and the high-pressure resistant condensate drain valve 36 is used for draining the condensed water in the reactor 3 and the catalyst deposited in the reactor 3;
the intelligent control element 6 comprises a controller 60 for controlling each electrical element to normally operate, a wireless communication module 61, a remote controller 62 connected with the controller 60 through the wireless communication module 61, a display screen 63 for displaying the working condition of each electrical element and an alarm 64 for alarming in a fault state;
the wastewater temporary storage tank 1 and the reuse water temporary storage tank 5 are respectively provided with a liquid level meter 7, the liquid level meters 7 are divided into a first liquid level meter 70, a second liquid level meter 71 and a third liquid level meter 72 which detect liquid levels with different liquid level heights, the liquid levels with different heights are detected through the three liquid level meters 7, and when the liquid levels are higher than the highest liquid level or lower than the lowest liquid level, the liquid pump 20 is controlled to start or stop, so that the wastewater treatment efficiency of the device is optimal, and the wastewater treatment time is shortened;
as shown in fig. 6, the flow buffering element 8 between the heat exchanger 2 and the reactor 3, the flow buffering element 8 includes a buffering tank 80 connected to the first reactor 30 through a connecting pipe and having a water outlet connector 800 on a side wall thereof, a flow limiting casing 81 disposed at the water outlet connector 800, a water outlet 810 connected to the first reactor 30 on the flow limiting casing 81, a buffering air bag 811 disposed in the flow limiting casing 81 and opposite to the water outlet connector 800, a T-shaped sliding rod 812 capable of sliding left and right in the flow limiting casing 81 is connected to a front side of the buffering air bag 811, a suction port 8110 is disposed on a rear side of the buffering air bag 811, a connection rear cover 813 having a filter screen 8130 on a side wall thereof is fastened to a rear side of the flow limiting casing 81, a water temperature is maintained at a stable level after heat exchange by the heat exchanger 2, a liquid enters the buffering tank 80 through the water outlet connector 800 to buffer and to eliminate a part of impact force, at this time, partial water flow impacts the T-shaped sliding rod 812 to compress the buffering air bag 811, and the volume of the inner cavity of the flow limiting shell 81 is increased, so that the pressure when the water flow is discharged through the water outlet 810 is reduced, after the water flow is discharged, the buffering air bag 811 returns to a free state, the impact force of the flow buffering element 8 on the water flow is weakened, the damage of the inner elements of the reactor 3 caused by the impact force of the water flow is avoided, the service life of the reactor 3 is prolonged, meanwhile, the existing spring buffering element is replaced by the buffering air bag 811, the problem that the spring is long in service time and easy to lose elasticity and damage is avoided, the structure is simple, the operation is convenient, the water outlet 810 is provided with the water expansion ring 8100 connected with the first reactor 30, as shown in fig. 7, the inner wall of the water expansion ring 8100 is provided with six buffering vertical bars 8101 along the circumferential direction, a buffering groove 8102 is formed between two adjacent vertical bars 8101, and flows to the first reactor 30 along each buffer tank 8102, so that the impact force of the water flow on the first reactor 30 is reduced, and the service life of the reactor 3 is prolonged, wherein each electric element used in the present invention is commercially available.
The treatment process of the high-concentration phenolic resin wastewater recycling treatment system comprises the following steps:
(1) firstly, high-concentration wastewater generated by producing phenolic resin enters a wastewater temporary storage tank 1, is filtered by a plurality of filter screens 100 with different meshes, solid impurities with different particle sizes in the wastewater are removed, the wastewater is aerated and fully reacts with activated sludge through the wastewater temporary storage tank 1, organic pollutants in the high-concentration wastewater are removed, when the wastewater enters the wastewater temporary storage tank 1, liquid levels with different heights in the wastewater temporary storage tank 1 are detected through a first liquid level meter 70, a second liquid level meter 71 and a third liquid level meter 72, when the first liquid level meter 70 detects that the liquid level in the wastewater temporary storage tank 1 is lower than the lowest preset liquid level, a signal is sent to a controller 60, the controller 60 controls a liquid pump 20 to be closed, when the second liquid level meter 71 detects that the liquid level is lower than the preset value, the controller 60 controls an alarm 65 to alarm to warn workers to find in time, when the third liquid level meter 72 detects that the liquid level is too high, the controller 60 controls the alarm 65 to give an alarm to warn a worker to stop adding wastewater into the wastewater temporary storage tank 1;
(2) secondly, pumping the filtered wastewater into the heat exchanger 2 positioned at the foremost end through the liquid pump 20, then sequentially passing through each heat exchanger 2, exchanging heat for the wastewater by using cooling water in the heat exchanger 2, and then recovering heat energy of the cooling water by using external equipment;
(3) after heat exchange by the heat exchanger 2, the water temperature is maintained at a stable level, liquid enters the buffer groove 80 through the water outlet connector 800 to be buffered to eliminate partial impact force, and then enters the flow limiting shell 81 through the water outlet connector 800, at the moment, partial water flow impacts the T-shaped slide rod 812 to compress the buffering air bag 811, the volume of the inner cavity of the flow limiting shell 81 is increased, the pressure when the water flow is discharged through the water outlet 810 is reduced, and the buffering air bag 811 is restored to a free state after the water flow is discharged;
(4) finally, the liquid after heat exchange treatment is discharged from the water outlet 810 to each reactor 3, wherein organic wastewater is uniformly distributed on a catalyst packing layer through a water distribution device in the first reactor 30, organic wastewater is decomposed under the action of a catalyst, in order to avoid exceeding standard of effluent, the organic undecomposed substances in the reaction product of the first reactor 30 can be decomposed by using the third reactor 32, and when the sewage treatment capacity is large, the first reactor 30 and the second reactor 31 are started to treat simultaneously, so that the sewage treatment process is increased;
(5) the gas-liquid mixture after heat exchange enters the gas-liquid separator 4, the separated gas enters an external subsequent treatment device through the top of the gas-liquid separator 4, the liquid enters the temporary storage tank 5 for the reuse water from the bottom end of the gas-liquid separator 4 for the production process of the phenolic resin, the whole process has the greatest characteristic of converting organic matters in the phenolic resin wastewater into resource substances such as methane, and the yield of the methane is more than 98%.
Claims (7)
1. The high-concentration phenolic resin wastewater recycling treatment system is characterized by mainly comprising a wastewater temporary storage tank (1) internally provided with a filtering device (10), a heat exchanger (2) connected with the wastewater temporary storage tank (1) and provided with a liquid pump (20) and an electromagnetic flowmeter (21) at the joint, a reactor (3) connected with the heat exchanger (2), a gas-liquid separator (4) for separating a gas-liquid mixture subjected to heat exchange treatment by the heat exchanger (2), a reuse water temporary storage tank (5) for temporarily storing liquid separated by the gas-liquid separator (4), an intelligent control element (6) and a power supply electrically connected with each electrical element;
the heat exchangers (2) are multiple, and the heat exchangers (2) are connected in sequence;
the three reactors (3) are respectively a first reactor (30), a second reactor (31) and a third reactor (32), the first reactor (30) and the second reactor (31) are connected in parallel and are respectively connected with the heat exchanger (2) positioned at the tail end, the third reactor (32) is respectively connected with the first reactor (30) and the second reactor (31), and the products treated by the first reactor (30) and the second reactor (31) are mixed;
the intelligent control element (6) comprises a controller (60) for controlling each electrical element to normally operate, a wireless communication module (61), a remote controller (62) connected with the controller (60) through the wireless communication module (61), a display screen (63) for displaying the working condition of each electrical element, and an alarm (64) for alarming in a fault state.
2. The high-concentration phenolic resin wastewater recycling treatment system according to claim 1, wherein the filtering device (10) comprises a plurality of filtering nets (100) horizontally arranged in the wastewater temporary storage tank (1) from top to bottom and gradually increasing in mesh number, a plurality of plugging plates (101) arranged at two ends of the side wall of the wastewater temporary storage tank (1) and located at each filtering net (100), and a plurality of folding connecting plates (102) for connecting the filtering nets (100) with the wastewater temporary storage tank (1), each filtering net (100) is formed by splicing two filtering subnetworks (1000), and two filtering subnetworks (100) are rotatably connected on one side and rotatably connected on the other side respectively with the folding connecting plates (102), a gravity sensor (1001) is arranged on each filtering subnetwork (1000), and the folding connecting plates (102) are driven by a motor.
3. The high-concentration phenolic resin wastewater recycling treatment system according to claim 1, wherein liquid level meters (7) are respectively arranged on the wastewater temporary storage tank (1) and the reuse water temporary storage tank (5), and the liquid level meters (7) are divided into a first liquid level meter (70), a second liquid level meter (71) and a third liquid level meter (72) for detecting different liquid level heights.
4. The high-concentration phenolic resin wastewater recycling system according to claim 1, wherein the first reactor (30), the second reactor (31) and the third reactor (32) are respectively provided with a remote thermometer (33), a remote pressure gauge (34), a safety valve (35) and a high pressure resistant drainage valve (36), and the first reactor (30), the second reactor (31) and the third reactor (32) are respectively provided with a heating system and a water distribution device.
5. The resourceful treatment system for high-concentration phenolic resin wastewater as claimed in claim 1, characterized in that a flow damping element (8) between the heat exchanger (2) and the reactor (3), the flow buffer element (8) comprises a buffer groove (80) which is connected with the first reactor (30) through a connecting pipe and is provided with a water outlet connecting port (800) on the side wall, a flow limiting shell (81) which is arranged at the water outlet connecting port (800), a water outlet (810) connected with the first reactor (30) is arranged on the flow limiting shell (81), a buffering air bag (811) opposite to the water outlet connecting port (800) is arranged in the flow limiting shell (81), and the front side of the buffering air bag (811) is connected with a T-shaped sliding rod (812) which can slide left and right in the flow limiting shell (81), the rear side of the buffering air bag (811) is provided with a suction opening (8110), and the rear side of the flow limiting shell (81) is buckled with a connecting rear cover (813) of which the side wall is provided with a filter screen (8130).
6. The high-concentration phenolic resin wastewater recycling treatment system according to claim 5, wherein a water expansion ring (8100) connected with the first reactor (30) is arranged at the water outlet (810), a plurality of buffering vertical bars (8101) are arranged on the inner wall of the water expansion ring (8100) along the circumferential direction, and a buffering groove (8102) is formed between every two adjacent buffering vertical bars (8101).
7. The resource treatment process for the high-concentration phenolic resin wastewater in any one of claims 1 to 6 is characterized by comprising the following steps of:
(1) firstly, high-concentration wastewater generated by producing phenolic resin enters a wastewater temporary storage tank (1), is filtered by a plurality of filter screens (100) with different meshes, solid impurities with different particle sizes in the wastewater are removed, the wastewater is aerated and fully reacts with activated sludge through the wastewater temporary storage tank (1), organic pollutants in the high-concentration wastewater are removed, when the wastewater enters the wastewater temporary storage tank (1), liquid levels with different heights in the wastewater temporary storage tank (1) are detected through a first liquid level meter (70), a second liquid level meter (71) and a third liquid level meter (72), when the first liquid level meter (70) detects that the liquid level in the wastewater temporary storage tank (1) is lower than the lowest preset liquid level, a signal is sent to a controller (60), the controller (60) controls a liquid pump (20) to be closed, and when the second liquid level meter (71) detects that the liquid level is lower than the preset value, the controller (60) controls an alarm (64) to alarm, when the third liquid level meter (72) detects that the liquid level is too high, the controller (60) controls the alarm (64) to give an alarm to warn the staff to stop adding wastewater into the wastewater temporary storage tank (1);
(2) secondly, pumping the filtered wastewater into a heat exchanger (2) positioned at the foremost end through a liquid pump (20), then sequentially passing through each heat exchanger (2), exchanging heat for the wastewater by using cooling water in the heat exchanger (2), and then recovering heat energy of the cooling water by using external equipment;
(3) after heat exchange is carried out by the heat exchanger (2), the water temperature is maintained at a stable level, liquid enters the buffer groove (80) through the water outlet connector (800) to be buffered and eliminate partial impact force, and then enters the flow limiting shell (81) through the water outlet connector (800), at the moment, partial water flow impacts the T-shaped slide rod (812), so that the T-shaped slide rod compresses the buffer air bag (811), the volume of the inner cavity of the flow limiting shell (81) is increased, the pressure when the liquid is discharged through the water outlet (810) is reduced, and the buffer air bag (811) is restored to a free state after the water flow is discharged;
(4) finally, liquid after heat exchange treatment is discharged from a water outlet (810) to each reactor (3), wherein organic wastewater is uniformly distributed on a catalyst packing layer through a water distribution device in the first reactor (30), organic wastewater is decomposed under the action of a catalyst, in order to avoid exceeding standard of effluent, organic matters which are not decomposed in reaction products of the first reactor (30) can be decomposed by using a third reactor (32), and when the sewage treatment capacity is high, the first reactor (30) and the second reactor (31) are started to treat simultaneously, so that the sewage treatment process is increased;
(5) the gas-liquid mixture after heat exchange enters a gas-liquid separator (4), the separated gas enters an external subsequent treatment device through the top of the gas-liquid separator (4), and the liquid enters a temporary storage tank (5) for recycled water from the bottom end of the gas-liquid separator (4) and is used for the production process of the phenolic resin.
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| CN113336380A (en) * | 2021-06-07 | 2021-09-03 | 南京大学 | High-temperature high-pressure continuous reaction device and application thereof in subcritical water thermal gasification |
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| CN113717783A (en) * | 2021-08-30 | 2021-11-30 | 安徽金德润滑科技有限公司 | Integrated process for detecting and treating crude oil impurities of lubricating oil |
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