CN213141665U - Water treatment unit for high-temperature coal gasification hardness removal and silicon removal and hardness removal water treatment system - Google Patents
Water treatment unit for high-temperature coal gasification hardness removal and silicon removal and hardness removal water treatment system Download PDFInfo
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Abstract
The application relates to the field of water treatment, in particular to a water treatment unit for high-temperature coal gasification hardness removal and silicon removal and a hardness removal and silicon removal water treatment system, wherein the water treatment unit comprises a hardness removal and silicon removal area, the hardness removal and silicon removal area comprises a plurality of coagulation tanks arranged along the flowing direction of sewage and a medicament adding pipe for removing hardness and silicon, and the last coagulation tank is provided with an aeration pipeline; the application also discloses remove silicon water processing system firmly, including precipitating the unit, still including establishing the above-mentioned water processing unit in precipitation unit upper reaches, this application has and can weaken the interior agitator of pond and precipitate the unit pipe chute scale deposit, the serious condition of scale deposit can not appear, guarantees the characteristics of entire system normal operating.
Description
Technical Field
The application relates to the technical field of water treatment, in particular to a water treatment unit for high-temperature coal gasification hardness removal and silicon removal and a hardness removal and silicon removal water treatment system.
Background
China has abundant coal resources, and how to utilize the coal resources cleanly and efficiently is one of the key research fields of scientific researchers. At present, coal gasification is the main way of high-efficiency comprehensive utilization of coal, and refers to a series of chemical reactions between organic matters in coal and gasifying agents (such as steam/air or oxygen) in a gasification furnace under certain temperature and pressure conditions to convert solid coal into coal containing CO and H2、CH4Isocombustible gas and CO2、N2And the like. Coal and water resources in China are obviously reversely distributed, most coal chemical engineering projects are distributed in areas with rich coal resources but poor water resources, water environment capacity is insufficient, supply and demand contradictions of local water resources are aggravated by rapid development of the coal chemical engineering projects, and water problems become bottlenecks which restrict development of the coal chemical industry. The near zero discharge of the wastewater can treat and recycle various wastewater generated by projects to the maximum extent, and the realization of the zero discharge of the wastewater is the self requirement of the development of coal chemical industry and is an important way for relieving the shortage of local water resources.
The wastewater generated by the coal chemical engineering project mainly comprises gasification wastewater, domestic and other organic wastewater, circulating sewage, chemical water station drainage, initial rainwater, ground flushing water and other characteristic wastewater; in the process of sewage treatment and reuse, strong brine and high-concentration brine are also generated. The most important of them is the treatment of the gasified waste water. For coal chemical engineering projects, the water quality and water quantity difference of gasification wastewater generated by different gasification technologies are large, and currently, crushed coal pressure gasification, pulverized coal gasification and coal water slurry gasification are mainly applied.
The water quality of the pulverized coal gasification water and the water coal slurry gasification water is generally high in TDS concentration, the effluent water is high in temperature, and contains high-hardness and high-silicon compounds, and the equipment and the pipeline are easy to scale and block due to the high hardness and silicon (usually calculated by silicon dioxide) content, so that the production device cannot be stopped to clean or replace the pipeline and the equipment, the long-period stable operation of a process system is seriously influenced, and the system operation and the starting and stopping cost are greatly increased. Scaling and blockage of an aeration head of a biochemical system of a subsequent biochemical unit are easily caused; scaling and fouling of a recycling unit membrane system; the evaporator and the preheater are scaled to influence the heat exchange effect; meanwhile, when the high-hardness and high-silicon wastewater is deeply treated, the reverse osmosis membrane with high silicon content can be scaled in a short time and is difficult to clean, so that the membrane performance is reduced or even loses efficacy, the service life of the reverse osmosis membrane and the treatment efficiency of a wastewater treatment system are greatly influenced, the water treatment cost is improved, and the problem that zero emission is performed by coal chemical enterprises is solved. Therefore, it is necessary to remove silicon and hardness from the gasified water.
At present, the common technology of removing hardness and silicon is to add lime and sodium carbonate to water to remove hardness, utilize magnesium oxide to remove silicon, and to the water of this kind of high temperature, high hardness, high silicon, can make the easy scale deposit of agitator in the high density sedimentation system in the processing, arouse agitator motor load increase, cause the motor to send out the boiling hot, can break off even and jump to stop to lead to the agitator can not move. In addition, soda ash added in the process of removing hardness by using the high-efficiency sedimentation tank is added together with a flocculating agent in a flocculation area at present, and if the high-temperature high-hardness high-silicon water quality is added according to the setting, the inclined tube of the rear-end sedimentation tank can be seriously scaled, even the inclined tube collapses, and the inclined tube needs to be cleaned regularly.
SUMMERY OF THE UTILITY MODEL
To the not enough that prior art exists, one of the purpose of this application lies in providing a water treatment unit that is used for high temperature coal gasification to remove hard desiliconization, has and can weaken the interior agitator scale deposit of pond, can not lead to the serious condition of scale deposit, guarantees the characteristics of agitator normal operating.
The second purpose of this application lies in providing a remove hard silicon water processing system that removes, has and to weaken agitator and precipitation unit pipe chute scale deposit in the pond, can not appear the serious condition of scale deposit, guarantees the characteristics of entire system normal operating.
The above object of the present application is achieved by the following technical solutions: the utility model provides a water treatment unit for high temperature coal gasification removes silicon of hardness, includes removes the silicon area of hardness, remove the silicon area of hardness and include a plurality of coagulation ponds that set up along sewage flow direction and be used for removing the medicament of silicon of removing and add the feeder tube, install the aeration pipeline in the last coagulation pond.
Through adopting above-mentioned technical scheme, remove hard and remove the silicon to sewage in the silicon region, be provided with in this application and explode the gas pipeline in last coagulation basin, utilize to explode the gas and realize mixing of the stirring of sewage in the coagulation basin, reduced the possibility of scale deposit for the system operation is more stable, when adopting even to explode the gas pipeline and replace the agitator, can also effectively reduce the equipment investment of earlier stage, practices thrift the cost.
The present application may be further configured in a preferred example to: a coagulation stirrer is also arranged in the coagulation tank provided with the explosion pipeline.
Through adopting above-mentioned technical scheme, so set up, both can improve the mixed effect of mixing liquid in the coagulation basin, can reduce coagulation stirrer scale deposit phenomenon in the coagulation basin moreover.
The present application may be further configured in a preferred example to: the hardness and silicon removal area comprises a first coagulation tank, a second coagulation tank and a third coagulation tank which are sequentially communicated along the flowing direction of sewage, and the medicament feeding pipe comprises an alkali substance feeding pipe, a magnesium agent feeding pipe, a coagulant feeding pipe and a soda feeding pipe;
the alkali substance feeding pipe and the magnesium agent feeding pipe are connected to a first coagulation tank, the coagulant feeding pipe is connected to a second coagulation tank, the soda adding pipe is connected to a third coagulation tank, and the aeration pipeline is installed in the third coagulation tank.
By adopting the technical scheme, alkali substances are added into the first coagulation tank, the raw sewage is adjusted to be alkaline, the temporary hardness is removed, magnesium hydroxide is partially generated in the first coagulation tank due to the addition of a magnesium agent, silicon is adsorbed, then the coagulation is performed in the second coagulation tank under the action of a coagulant to generate a flocculating constituent, then the flocculating constituent enters the third coagulation tank, the hardness is further removed by the addition of the soda in the third coagulation tank, the silicon is removed through hardness removal, in the process, the setting of an aeration pipeline enables the soda and the sewage in the third coagulation tank to be fully mixed, the possibility of scaling is reduced, and the system is enabled to run more stably.
The present application may be further configured in a preferred example to: all be provided with in first coagulating basin and the second coagulating basin and thoughtlessly congeal the agitator.
Through adopting above-mentioned technical scheme, the thoughtlessly congeal the agitator that sets up in first thoughtlessly congeals pond and the second thoughtlessly congeals the pond makes medicament and sewage carry out abundant mixture to guarantee to remove hard silicon effect that removes.
The present application may be further configured in a preferred example to: an aeration pipeline is also arranged in the second coagulation tank.
Through adopting above-mentioned technical scheme, can produce more sediment or flocculating constituent in the second coagulation pond, be provided with the aeration pipe way in the second coagulation pond, when can guaranteeing sewage and medicament mixed effect, reduce the coagulation stirrer scale deposit possibility, further guarantee the stationarity of system operation.
The present application may be further configured in a preferred example to: the aeration pipeline comprises an aeration main pipe communicated with an aeration source, the aeration main pipe is communicated with at least one aeration branch pipe, and the pipe orifices of the aeration branch pipes are positioned in the coagulation tank and close to one side of the tank bottom.
Through adopting above-mentioned technical scheme, so set up and to have better aeration effect to the coagulating basin to can not lead to aeration mouth of pipe scale deposit to block up.
The present application may be further configured in a preferred example to: and valves are arranged on the aeration branch pipes.
By adopting the technical scheme, the aeration and the aeration quantity of the aeration branch pipe can be controlled by arranging the valve.
The present application may be further configured in a preferred example to: the aeration branch pipe is arranged on the wall of the coagulation tank.
Through adopting above-mentioned technical scheme, so set up and to carry out the aeration to the sewage that is close to pool wall department in the coagulation basin and mix, guarantee the mixed effect of medicament and sewage.
In order to achieve the second purpose, the application provides the following technical scheme that the water treatment system for removing the hard silicon comprises a precipitation unit and a water treatment unit which is arranged at the upstream of the precipitation unit and is used for removing the hard silicon.
By adopting the technical scheme, the water treatment unit provided with the aeration pipeline is applied to the water treatment system, so that the scaling phenomenon of the coagulation stirrer can be reduced, and the stable operation of the water treatment system is ensured.
The present application may be further configured in a preferred example to: still include the flocculation basin with last coagulation basin intercommunication, flocculation basin keeps away from water treatment unit one side and passes weir and precipitation unit intercommunication through one, is provided with the pipe chute in the precipitation unit.
Through adopting above-mentioned technical scheme, so set up, in the sewage in the flocculation district directly got into the precipitation unit, increased settling time in the precipitation unit, can not let the sewage that the flocculation basin unreacted was accomplished get into pipe chute department reaction, reduce the scale deposit phenomenon of pipe chute department, reduce the frequency of clearing up the pipe chute, and can not lead to the scale deposit phenomenon of pipe chute serious, lead to the pipe chute to collapse, guarantee the stability of water treatment system operation.
The present application may be further configured in a preferred example to: a guide flow cylinder is arranged in the flocculation tank, and a flocculation stirrer and a flocculating agent feeding ring are arranged in the guide flow cylinder.
Through adopting above-mentioned technical scheme, the setting of flocculating agent throw the dosing ring can be to adding the flocculating agent in the draft tube, and the flocculation agitator stirs flocculating agent and sewage in to the draft tube, and the coagulation basin sewage gets into flocculation behind the flocculation basin, then gets into the sedimentation tank and deposits.
In summary, the application has the following beneficial technical effects:
1. according to the system, the sewage and the medicament in the coagulation tank are mixed and reacted by the aeration mode through the arrangement of the aeration pipeline, so that the mixing is more uniform, the generated particles cannot be precipitated, the scaling possibility of a stirrer is reduced, and the operation of a water treatment system is more stable;
2. the aeration pipeline is adopted to replace a stirrer to realize the mixing reaction of the sewage and the medicament in the coagulation tank, so that the equipment investment in the early stage can be effectively reduced, and the cost can be saved;
3. in the application, the feeding point of the soda is changed to the upstream third coagulation tank, so that the reaction time is effectively increased, the reaction on the inclined tube of the sedimentation tank is avoided, the scale formation of the inclined tube is avoided, the collapse accident of the inclined tube is avoided, and the operation of the water treatment system is more stable;
4. direct intercommunication between flocculation basin and the sedimentation tank in this application cancels the thrust zone, and the increase of subside district in advance for sewage precipitation reaction time is more of a specified duration, and the reaction is more complete, can not lead to the reaction to continue on the pipe chute, causes the pipe chute scale deposit, avoids the accident that the pipe chute collapsed, makes water treatment system operation more stable.
Drawings
FIG. 1 is a schematic view of a water treatment unit of the present application without an aeration line;
FIG. 2 is a side view of a third coagulation basin in the present application;
FIG. 3 is a schematic view showing the connection between a third coagulation tank and an aeration line in the present application;
FIG. 4 is a schematic diagram of the construction of the water treatment system of the present application;
FIG. 5 is a schematic view showing the connection relationship between the flocculation tank and the sedimentation tank;
fig. 6 is a schematic structural diagram representing a thrust zone in the present application.
In the figure, 1, an aeration pipeline; 11. an aeration main pipe; 12. an aeration branch pipe; 13. a valve; 14. a fixing member; 2. a flocculation tank; 21. a draft tube; 22. a flocculation stirrer; 23. a flocculating agent feeding ring; 24. a baffle plate; 25. a plug flow area; 26. a flocculating agent feeding pipe; 3. a sedimentation tank; 31. an inclined tube; 32. a mud scraper; 33. a pre-settling zone; 4. a first coagulation tank; 41. an alkaline substance addition tube; 42. a magnesium agent feeding pipe; 5. a second coagulation tank; 51. a coagulant adding pipe; 6. a third coagulation tank; 61. a soda adding pipe; 7. a water passage; 8. a water-passing weir; 9. a coagulation stirrer.
Detailed Description
The present application is described in further detail below with reference to the attached drawings.
Referring to fig. 1 and 2, the water treatment unit for high-temperature coal gasification de-hardening and silicon removal disclosed by the application comprises a de-hardening and silicon removal area, wherein the de-hardening and silicon removal area comprises a plurality of coagulation tanks arranged along the flow direction of sewage, the coagulation tanks are respectively connected with a medicament feeding pipe for de-hardening and silicon removal, the most precipitated particles are generated in the last coagulation tank, at least an aeration pipeline 1 is installed in the last coagulation tank, one end of the aeration pipeline 1 is positioned in the coagulation tank, and the other end of the aeration pipeline is connected with an aeration source.
Specifically, one of them mode is for including the first coagulation basin 4, the second coagulation basin 5, the third coagulation basin 6 that sets gradually along sewage flow direction, first coagulation basin 4 is connected with the inlet tube, the third coagulation basin 6 upper end is connected with the outlet pipe that thoughtlessly congeals, through one 8 intercommunications of weir are crossed between first coagulation basin 4 and the second coagulation basin 5, through a water channel intercommunication between second coagulation basin 5 and the third coagulation basin 6, cross the common locular wall that water weir 8 generally is two adjacent districts, and the top of this common locular wall is less than the pond top elevation. The first coagulation basin 4 is connected with an alkali substance feeding pipe 41 and a magnesium agent feeding pipe 42, the alkali substance can be lime or sodium hydroxide or the mixture of the lime and the sodium hydroxide, as long as the alkali substance can adjust the pH of raw water in the first coagulation basin 4 to be alkaline, and preliminary hardness removal is carried out, the magnesium agent can be magnesium oxide, and magnesium hydroxide is produced in the first coagulation basin 4 under the alkaline condition to carry out adsorption and silicon removal. The second coagulation tank 5 is connected with a coagulant adding pipe 51, the third coagulation tank 6 is connected with a soda adding pipe 61, and the aeration pipeline 1 is arranged in the third coagulation tank 6.
When sewage is treated, lime or sodium hydroxide is added into the first coagulation tank 4, the temporary hardness of the sewage is removed in an alkaline state, the addition of magnesium oxide realizes silicon removal, then the sewage enters the second coagulation tank 5, a flocculating constituent is generated under the action of a coagulant, and then the sewage enters the third coagulation tank 6, and the hardness is further removed under the action of soda. Aeration pipeline 1's setting up in the third coagulation basin 6 realizes making soda agent and sewage carry out intensive mixing through the mode of aeration to avoid the possibility of coagulating stirrer 9 scale deposit, can also guarantee simultaneously and mix the effect, thereby keep the even running of system.
Mainly utilize the mode of aeration to realize the mixture of medicament and sewage in this application for the particulate matter that generates is unlikely to deposit and gets into the follow-up processing process, guarantees that it removes silicon effect hard, compares simultaneously and stirs in the mode that adopts thoughtlessly congeal agitator 9 among the prior art, and the mode of this application can reduce the possibility of scale deposit, makes the system operation ground more stable.
Based on this, the aeration pipelines 1 can be arranged in both the first coagulation tank 4 and the second coagulation tank 5, the mixing reaction of the medicament and the sewage is realized by adopting an aeration mode, and no sediment is generated at the same time, and the mixture enters a subsequent treatment unit, and considering that the sediment in the first coagulation tank 4 is less, the sediment in the second coagulation tank 5 and the third coagulation tank 6 is more, and especially the sediment generated in the third coagulation tank 6 is the largest in quantity, the aeration pipelines 1 can be arranged in both the second coagulation tank 5 and the third coagulation tank 6, or only the aeration pipeline 1 can be arranged in the third coagulation tank 6.
Can be provided with coagulation stirrer 9 simultaneously in the coagulation basin that is provided with aeration pipe 1, also can only be provided with aeration pipe 1, adopt aeration pipe 1 to replace coagulation stirrer 9, consider to add the mixed effect of medicament and sewage, and particulate matter is more in second coagulation basin 5 and the third coagulation basin 6, can be provided with coagulation stirrer 9 and aeration pipe 1 simultaneously in second coagulation basin 5 and the third coagulation basin 6, setting up of coagulation stirrer 9 makes medicament and sewage mix ground more evenly in the coagulation basin, the reaction is more complete, and can further prevent that the particulate matter that generates from taking place to deposit.
This application mainly improves on the point lies in the realization that the stirring mixes, consequently a plurality of thoughtlessly congeal the pond and the medicament that is connected with it adds the pipe and is not limited to above-mentioned mode, also can be other modes, only need to set up and correspond the adoption to thoughtlessly congeal the pond and can remove the medicament of silicon and cooperate, the realization removes except that the silicon can, no matter with what kind of mode remove the silicon firmly, only need set up aeration pipeline 1 at last thoughtlessly congeal the pond and carry out the aeration, reduce thoughtlessly congeal agitator 9 scale deposit can, of course, other thoughtlessly congeal the pond also can set up aeration pipeline 1 as required.
As shown in FIG. 3, the aeration pipeline 1 comprises an aeration main pipe 11 communicated with an aeration source, the aeration main pipe 11 is communicated with at least one aeration branch pipe 12, the pipe orifice of the aeration branch pipe 12 is positioned in the coagulation tank and close to one side of the tank bottom, and a valve 13 is arranged on the aeration branch pipe 12. The number and the position of the aeration branch pipes 12 are flexibly adjusted according to water quality, and only the condition that one ends of the aeration branch pipes 12 are located in the coagulation tank to realize aeration is needed, in the embodiment, the aeration branch pipes 12 are 4 pieces, and the four aeration branch pipes 12 are vertically communicated with an aeration source through the aeration main pipe 11, so that the aeration main pipe 11 and the aeration branch pipes 12 are in an I shape, aeration ports of the four aeration branch pipes 12 are located in the coagulation tank, and the pipe orifices of the aeration branch pipes 12 are located on one side, close to the bottom of the tank, of the coagulation tank. The aeration branch pipe 12 is arranged to perform better aeration on the coagulation tank, the aeration port of the aeration branch pipe 12 is positioned on one side, close to the bottom of the coagulation tank, the aeration effect is better, the sedimentation of particles in the coagulation tank can be further prevented, and the valve 13 can be arranged to control the aeration switch of the aeration branch pipe 12 and the adjustment of the aeration amount.
The mounted position of aeration branch pipe 12 is not limited, as long as realize that the mouth of pipe of aeration branch pipe 12 is in the coagulation basin can, consider the installation of coagulation stirrer 9 in the coagulation basin, and to the aeration effect of sewage, install aeration branch pipe 12 on the wall of coagulation basin, stability when so can strengthen aeration branch pipe 12 aeration, and can not influence the stirring of coagulation stirrer 9, and can also be close to the sewage of pool wall department in the coagulation basin and also can carry out the aeration, further strengthen the mixed effect of medicament and sewage, also can further prevent that the particulate matter in the coagulation basin from taking place to deposit and subside.
The installation of branch aeration pipe 12 and coagulating basin can be fixed connection, also can dismantle the connection, and the mode of selecting for use in this embodiment is through a plurality of mounting 14 fixed mounting with branch aeration pipe 12 on the coagulating basin pool wall, and mounting 14 can be the fixed block, and branch aeration pipe 12 passes and is fixed with the fixed block, and the fixed block is fixed with coagulating basin pool wall, so can guarantee the stability of aeration pipe during aeration.
As shown in fig. 4, the application also discloses a remove hard silicon water processing system that removes including above-mentioned water processing unit, this water processing system still includes flocculation unit and precipitation unit, the flocculation unit includes flocculation basin 2 with the intercommunication of third coagulation basin 6, install draft tube 21 and be used for throwing the flocculating agent of throwing of flocculating agent and throw ring 23 in the flocculation basin 2, flocculating agent is thrown ring 23 and is connected with flocculating agent and throws feeder tube 26, still install flocculation agitator 22 in the flocculation basin 2, the stirring vane of flocculation agitator 22 is in draft tube 21, the lower extreme of flocculation basin 2 is connected with the flocculation inlet tube, the flocculation inlet tube communicates with the coagulation outlet pipe of third coagulation basin 6, and the inlet tube other end is in draft tube 21. The sedimentation unit comprises a sedimentation tank 3, an inclined pipe 31 and a mud scraper 32 are arranged in the sedimentation tank 3, and a water outlet groove is formed in the sedimentation tank 3 and used for discharging water.
The flocculation tank 2 is communicated with the sedimentation tank 3 through a water-passing weir 8, as shown in fig. 5, one side of the flocculation tank 2, which is far away from the water treatment unit, is directly communicated with the sedimentation tank 3 through the water-passing weir 8, and sewage entering the flocculation area reacts with a flocculating agent in a guide cylinder 21 and then directly enters the sedimentation tank 3 through the water-passing weir 8 for sedimentation and separation; or as shown in fig. 6, a baffle 24 is arranged on one side of the flocculation tank 2 close to the sedimentation tank 3, a water passage is formed between a water outlet arranged at the lower end of the baffle 24 and the bottom of the tank, a push flow area 25 is formed between the baffle 24 and a water passing weir 8, sewage firstly reacts with a flocculating agent in the draft tube 21, then passes through the push flow area 25 through the water passage, and then enters the sedimentation area through the water passing weir 8 for sedimentation and separation, either of the two modes can be adopted, compared with the latter mode, the push flow area 25 is cancelled in the former mode, flocculated water can directly enter the sedimentation area, the pre-sedimentation area 33 formed between the inclined tube 31 and the water passing weir 8 is enlarged, the sedimentation time is increased, the sewage reaction is more complete, the incomplete reaction at the position of the inclined tube 31 is reduced, the scaling phenomenon at the inclined tube 31 is serious, the frequency of cleaning the inclined tube 31 is reduced, and the inclined tube 31 cannot be seriously, therefore, the former method is selected in this embodiment
The sedimentation tank 3 can be a high-efficiency sedimentation tank 3 or other sedimentation tanks 3 such as a sand-adding sedimentation tank 3, and only the water in the flocculation tank 2 needs to be controlled to directly enter the sedimentation tank 3, the flow pushing area 25 is omitted, the reaction time is prolonged, and the phenomenon that the inclined tube 31 is seriously scaled due to the reaction of the unreacted sewage at the inclined tube 31 is prevented.
The application provides a water treatment unit and water processing system not only can be applied to high temperature coal gasification waste water treatment, also can be applied to other waste water treatment fields, play and remove the effect of silicon firmly. The following application examples are described by taking the treatment of high-temperature coal gasification wastewater as an example. In addition, soda ash added in the hardness removal process is added together with a flocculating agent in the flocculation tank 2 at present, high-temperature high-hardness high-silicon fly-out is caused to high-temperature coal gasification wastewater, and if the water quality for treating the high-temperature high-hardness high-silicon is treated by adopting the adding mode, the inclined tube 31 in the downstream sedimentation tank 3 is seriously scaled, and even the inclined tube 31 is collapsed. Consequently to the water treatment of high temperature high rigidity high silicon, can set up the throwing of soda on being located the third coagulation basin 6 of flocculation basin 2 upper reaches with the throwing point of soda in this application, effectively increased reaction time, can reduce owing to react the pipe chute 31 scale deposit phenomenon that causes on the pipe chute 31 of sedimentation tank 3, avoid the pipe chute 31 accident of collapsing, guarantee the even running of system.
Application example
The hardness-removing and silicon-removing water treatment system is applied to hardness-removing and silicon-removing treatment of sewage, wherein the sewage is the mixture of the sewage of a coal water slurry gasification device and the sewage of a powder coal gasification device, the water inlet quality of the sewage is shown in the following table 1, the water inlet temperature of the sewage is about 80 ℃, the sewage is high-temperature, high-hardness and high-silicon sewage, the water treatment unit in the water treatment system is a three-stage coagulation tank which is respectively a first coagulation tank 4, a second coagulation tank 5 and a third coagulation tank 6 as shown in figure 4, the first coagulation tank 4 is connected with a sodium hydroxide feeding pipe and a magnesium oxide feeding pipe, the second coagulation tank 5 is connected with a coagulant feeding pipe 51, the coagulant is polymerized ferric sulfate, the third coagulation tank 6 is connected with a soda feeding pipe 61, the third coagulation tank 6 is provided with a coagulation stirrer 9, the second coagulation tank 5 and the third coagulation tank 6 are provided with aeration pipelines 1, and 4 aeration branch pipes 12 are arranged, in addition, referring to fig. 5, the flocculation tank 2 of the water treatment system is the flocculation tank 2 without the thrust zone 25, the sewage in the flocculation tank 2 directly enters the sedimentation tank 3 through the weir 8 for sedimentation separation, and the quality of the effluent after sedimentation separation from the sedimentation tank 3 after continuous operation for 4-6 weeks is shown in the following table 1.
Table 1: the quality of sewage inlet water in application examples
| Categories | pH | Turbidity of water | SS（mg/l） | Total hardness (mg/l) | Total silicon (mg/l) |
| Inflow water | ≤7-8 | <10 | <500 | 1000-2500 | 150-200 |
| Precipitating the effluent | ≤7-8 | <10 | <15 | <250 | <30 |
From table 1 above, it can be seen that the water treatment system who adopts this application to provide removes that the silicon is effectual except that hard, and thoughtlessly congeals agitator 9 moreover and can not produce serious scale deposit phenomenon, and entire system operates steadily, and thoughtlessly congeals agitator 9 and pipe chute 31 and can not produce the serious phenomenon of scale deposit.
Comparative example 1
The effluent hardness silicon removal water treatment system in the application example is adopted, and the difference is that only a coagulation stirrer 9 is arranged in a third-stage coagulation tank in the water treatment system, but an aeration pipeline 1 is not arranged, and the flocculation tank 2 is selected from the flocculation tank 2 provided with a thrust zone 25, so that sewage in the flocculation tank 2 firstly enters the thrust zone 25 and then enters a sedimentation tank 3 for sedimentation and separation, when the water treatment system is adopted, the coagulation stirrers 9 in the coagulation tank, particularly in a second coagulation tank 5 and a third coagulation tank 6 are seriously scaled, the coagulation effect of the sewage and a medicament in the second coagulation tank 5 and the third coagulation tank 6 is poor, the medicament is not uniformly stirred, the reaction is incomplete, the effluent hardness and the silicon do not reach the standard, even more serious scaling is caused by the blades of the coagulation stirrer 9 in the third coagulation tank 6, the load is increased, a motor is scalded, and a trip phenomenon is generated, when the system is stopped, the blade is cleaned to scale after the machine is stopped for draining, and the water treatment work is influenced.
Comparative example 2
The water treatment system for removing silicon through hardness in an application example is adopted, and is different in that a third coagulation tank 6 is omitted in the water treatment system, only a coagulation stirrer 9 is arranged in a second-stage coagulation tank 5, an aeration pipeline 1 is not arranged, a soda addition point is changed into a flocculation tank 2, and the flocculation tank 2 is selected from the flocculation tank 2 provided with a thrust zone 25, so that sewage in the flocculation tank 2 firstly enters the thrust zone 25 and then enters a sedimentation tank 3 for sedimentation separation.
In conclusion, aiming at the existing method for removing hard silicon, the coagulation stirrer 9 usually scales seriously and affects water treatment operation, one of the improvement ways is to improve the impeller of the coagulation stirrer 9, adjust the angle of the impeller and reduce the width of the impeller, and the scheme has certain effect but not good effect, and the stirring strength is weakened to affect the reaction of a medicament and sewage; the other way is to change the position of adding soda ash, the adding point of soda ash is not in the third coagulation tank 6, but the adding point of soda ash is arranged in the flocculation tank 2, the third coagulation tank 6 is directly removed, the third coagulation tank 6 can be saved, and the occupied land is saved, but the reaction time for removing hardness is not enough as a result of adding soda ash in the flocculation tank 2, so that the hardness removing reaction is carried out all the time until the inclined pipe 31 of the settling zone can generate the hardness removing reaction, the rest hardness removing reaction can possibly occur on the inclined pipe 31, and the scaling of the inclined pipe 31 for discharging water can be more serious due to the operation. In the application, the aeration pipeline 1 is arranged in the coagulation tank at first, the mixing of the medicament and the sewage is realized by utilizing the aeration mode, the particle precipitation in the coagulation tank is prevented, the scaling phenomenon of the coagulation stirrer 9 is reduced, the adding point of the calcined soda is changed into a third coagulation tank, the reaction time is prolonged, and the pre-settling zone 33 formed between the inclined pipe 31 and the wall of the settling zone in the settling zone is larger due to the arrangement of the elimination and thrust zone 25 in the flocculation zone, so that the reaction time is longer, and the scaling at the inclined pipe 31 is reduced.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A water treatment unit for high-temperature coal gasification hardness removal and silicon removal comprises a hardness removal and silicon removal area, and is characterized in that: the hard silicon removing area comprises a plurality of coagulation tanks arranged along the flowing direction of sewage and a medicament adding pipe for removing hard silicon, and an aeration pipeline (1) is arranged in the last coagulation tank.
2. The water treatment unit for high-temperature coal gasification de-hardening de-silicidation according to claim 1, characterized in that: a coagulation stirrer (9) is also arranged in the coagulation tank provided with the aeration pipeline (1).
3. The water treatment unit for high-temperature coal gasification de-hardening de-silicidation according to claim 1, characterized in that: the hardness and silicon removal zone comprises a first coagulation tank (4), a second coagulation tank (5) and a third coagulation tank (6) which are sequentially communicated along the flowing direction of sewage, and the medicament adding pipe comprises an alkali substance adding pipe (41), a magnesium agent adding pipe (42), a coagulant adding pipe (51) and a soda adding pipe (61);
an alkali substance feeding pipe (41) and a magnesium agent feeding pipe (42) are connected to a first coagulation tank (4), a coagulant feeding pipe (51) is connected to a second coagulation tank (5), a soda feeding pipe (61) is connected to a third coagulation tank (6), and an aeration pipeline (1) is arranged in the third coagulation tank (6).
4. The water treatment unit for high-temperature coal gasification de-hardening de-silicidation according to claim 3, characterized in that: and a coagulation stirrer (9) is arranged in each of the first coagulation tank (4) and the second coagulation tank (5).
5. The water treatment unit for high-temperature coal gasification de-hardening de-silicification according to claim 4, characterized in that: an aeration pipeline (1) is also arranged in the second coagulation tank (5).
6. The water treatment unit for high-temperature coal gasification de-hardening de-silicidation according to claim 1, characterized in that: the aeration pipeline (1) comprises an aeration main pipe (11) communicated with an aeration source, the aeration main pipe (11) is communicated with at least one aeration branch pipe (12), and the pipe orifice of the aeration branch pipe (12) is positioned in the coagulation pond and is close to one side of the pond bottom.
7. The water treatment unit for high-temperature coal gasification de-hardening de-silicidation according to claim 6, characterized in that: and a valve (13) is arranged on the aeration branch pipe (12).
8. The water treatment unit for high-temperature coal gasification de-hardening de-silicidation according to claim 6, characterized in that: the aeration branch pipe (12) is arranged on the wall of the coagulation tank.
9. The utility model provides a remove hard desiliconization water processing system, includes precipitation unit, its characterized in that: further comprising a water treatment unit for removing hard silicon according to any one of claims 1 to 8 disposed upstream of the precipitation unit.
10. The water treatment system for removing hard silicon according to claim 9, characterized in that: still include flocculation basin (2) with last coagulation basin intercommunication, flocculation basin (2) keep away from water treatment unit one side through one cross weir (8) and deposit the unit intercommunication, are provided with pipe chute (31) in the unit of deposiing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021803054.9U CN213141665U (en) | 2020-08-25 | 2020-08-25 | Water treatment unit for high-temperature coal gasification hardness removal and silicon removal and hardness removal water treatment system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113443741A (en) * | 2021-07-01 | 2021-09-28 | 重庆市梁平排水有限公司 | Follow-on high-density pond |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113443741A (en) * | 2021-07-01 | 2021-09-28 | 重庆市梁平排水有限公司 | Follow-on high-density pond |
| CN113443741B (en) * | 2021-07-01 | 2023-09-12 | 重庆市梁平排水有限公司 | Improved high-density pool |
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