CN210394061U - Treatment system for dry-method activated coke/carbon desulfurization and denitrification gas-rich pretreatment wastewater - Google Patents
Treatment system for dry-method activated coke/carbon desulfurization and denitrification gas-rich pretreatment wastewater Download PDFInfo
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- Removal Of Specific Substances (AREA)
Abstract
The utility model relates to a processing system of rich gas preliminary treatment waste water of dry process active coke/charcoal SOx/NOx control, including pretreatment unit and ammonium salt recovery unit, wherein, pretreatment unit includes: the pH adjusting tank is used for receiving raw wastewater and carrying out pH adjusting treatment and defluorination treatment; the inlet of the flocculation reaction tank is connected with the pH adjusting tank and is used for reducing the hardness of the wastewater and carrying out flocculation reaction; the inlet of the sedimentation tank is connected with the flocculation reaction tank; the sludge pump is arranged at the inlet and the sludge outlet of the sedimentation tank; the plate-and-frame filter press is connected with the outlet of the sludge pump; the ammonium salt recovery unit comprises: the inlet of the evaporative crystallization device is connected with the clear liquid outlet of the sedimentation tank; the inlet of the cyclone is connected with the evaporative crystallization device; the inlet of the centrifugal machine is connected with the outlet of the cyclone; and the inlet of the dryer is connected with the outlet of the centrifuge. According to the treatment system, impurities in the wastewater are removed, and then ammonium salt evaporation and concentration are carried out to generate the ammonium sulfate and the ammonium chloride agricultural fertilizer, so that zero discharge of the wastewater and resource recovery are realized.
Description
Technical Field
The utility model belongs to the technical field of the rich gas resource engineering of environmental protection trade dry process active coke/charcoal SOx/NOx control, especially relate to a rich gas preliminary treatment effluent disposal system of dry process active coke/charcoal SOx/NOx control.
Background
The principle of the dry-method active coke/carbon denitration and desulfurization rich gas is as follows: the active coke/carbon adsorbs SO in the flue gas under a certain temperature condition2Oxygen and water vapor, and SO under the catalysis of active points on the surface of the active coke/carbon2Oxidation to SO3，SO3Reacting with water vapor to generate sulfuric acid which is adsorbed on the surface of the active coke/carbon; when the activated coke/carbon is heated to 600 ℃ of 300-2、CO2And H2O, etc., SO in gas2The content of 20-40 percent can be processed into chemical products such as sulfuric acid, elemental sulfur and the like according to requirements to desorb SO2The active coke can be recycled.
Rich gas generated by dry-method activated coke/carbon desulfurization and denitrification (namely high-concentration SO obtained by activated carbon/coke regeneration after desulfurization and denitrification2) The resource utilization can be carried out, but the impurity content in the rich gas is more, for example, see the following table 1. In order to recover the rich gas better, the rich gas needs to be pretreated, cooled and purified.
TABLE 1 gas-rich component produced by dry-process activated coke/charcoal desulfurization and denitrification
To recover the ammonium salt with high purity from the wastewater obtained by the pretreatment of the rich gas, the rich gas needs to be pretreated by process water to remove impurities. The pretreatment main equipment (regeneration gas purification pretreatment device) includes: the device comprises a washing tower, a primary washing pump, a sewage discharge pump, a secondary washing tank, a secondary washing pump, a plate heat exchanger, an electric demisting device and the like. The pretreatment is generally SO-rich that will be desorbed2The gas is washed and cooled by spraying water, so that the temperature is reduced to below 40 ℃, impurities are remained in the water, wastewater with complex components is generated, and qualified raw material gas is provided for the subsequent synthesis section. The wastewater generated by the dry-method activated coke/carbon desulfurization and denitrification rich gas pretreatment has the following characteristics: is acidic; the suspension is high; NH3-N is high; containing heavy metal ions such as Hg and Pb. The complex characteristics of the method lead to unsatisfactory treatment effect and substandard wastewater discharge.
Zero discharge of wastewater is a new requirement new standard for social development, and with the continuous improvement of national environmental protection requirements, wastewater generated by dry-process activated coke desulfurization and denitrification rich gas also needs to meet the direct discharge standard in the discharge standard of pollutants for water in the iron and steel industry (GB 13456-. At present, no mature treatment method exists for the wastewater, so that the development of a treatment system for wastewater generated by dry-method activated coke/carbon desulfurization and denitrification rich gas pretreatment is urgently needed
SUMMERY OF THE UTILITY MODEL
The utility model discloses the purpose is for overcoming the not enough and processing system who provides a rich gas preliminary treatment waste water of dry process active coke/charcoal SOx/NOx control, this system is through at first getting rid of impurity in the waste water, then with waste water evaporation ammonium salt concentration, produces ammonium sulfate and ammonium chloride agricultural fertilizer, and then realizes the waste water zero release.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a treatment system for dry-method activated coke/carbon desulfurization and denitrification rich gas pretreatment wastewater comprises a pretreatment unit and an ammonium salt recovery unit, wherein,
the preprocessing unit includes:
the pH adjusting tank is used for receiving the wastewater raw water and carrying out pH adjustment treatment and defluorination treatment on the wastewater raw water;
the inlet of the flocculation reaction tank is connected with the pH adjusting tank and is used for reducing the hardness of the wastewater and carrying out flocculation reaction;
the inlet of the sedimentation tank is connected with the flocculation reaction tank, the clear liquid outlet of the sedimentation tank is connected with the ammonium salt recovery unit, and the sludge outlet of the sedimentation tank is connected with a sludge pump;
the sludge pump is arranged between the inlet and the sludge outlet of the sedimentation tank;
the plate-and-frame filter press is connected with the outlet of the sludge pump and is used for dewatering sludge at the bottom of the sedimentation tank;
the ammonium salt recovery unit comprises:
the inlet of the evaporative crystallization device is connected with the clear liquid outlet of the sedimentation tank and is used for evaporating and crystallizing the clear liquid output by the pretreatment unit;
the inlet of the cyclone is connected with the evaporative crystallization device through a cyclone feeding pump and is used for dehydrating the slurry generated by the evaporative crystallization device;
the inlet of the centrifugal machine is connected with the outlet of the cyclone and is used for further separating ammonium salt crystals and moisture;
and the inlet of the dryer is connected with the outlet of the centrifuge and used for drying ammonium salt and producing the dry ammonium fertilizer.
As a preferred embodiment, the filtrate outlet of the plate-and-frame filter press is connected with the inlet of the sedimentation tank; the liquid outlet of the cyclone is connected with the inlet of the flocculation reaction tank; and a liquid outlet of the centrifuge is connected with an inlet of the flocculation reaction tank.
The treatment system for the dry-method activated coke/carbon desulfurization and denitrification rich gas pretreatment wastewater is a preferred embodiment,
in the pretreatment unit, the flocculation reaction tank comprises a first flocculation reaction tank and a second flocculation reaction tank, the sedimentation tank comprises a first sedimentation tank and a second sedimentation tank, wherein,
the inlet of the first flocculation reaction tank is connected with the outlet of the pH adjusting tank, and the inlet of the first sedimentation tank is connected with the outlet of the first flocculation reaction tank;
the inlet of the second flocculation reaction tank is connected with the clear liquid outlet of the first sedimentation tank, and the inlet of the second sedimentation tank is connected with the outlet of the second flocculation reaction tank;
the sludge pump comprises a first sludge pump and a second sludge pump, and the plate-and-frame filter press is respectively connected with the first sedimentation tank and the second sedimentation tank through the first sludge pump and the second sludge pump.
As a preferred embodiment, the liquid outlet of the cyclone is connected with the inlet of the second flocculation reaction tank; and a liquid outlet of the centrifuge is connected with an inlet of the second flocculation reaction tank.
As a preferred embodiment, the sedimentation tank is a vertical sedimentation tank.
As a preferred embodiment, the sedimentation tank is a clarification tank.
As a preferred embodiment, the pretreatment unit further comprises a clear liquid tank for storing clear liquid obtained after treatment in the sedimentation tank.
As a preferred embodiment, the evaporative crystallization device is a triple-effect evaporator.
As a preferred embodiment, the system for treating rich gas pretreatment wastewater by dry activated coke/char desulfurization and denitrification further comprises: the drying machine is connected with the centrifugal machine through the spiral conveyor.
As a preferred embodiment, the system for treating rich gas pretreatment wastewater by dry activated coke/char desulfurization and denitrification further comprises: the inlet of the middle groove is connected with the evaporative crystallization device, the outlet of the middle groove is connected with the cyclone, and a stirrer is arranged in the middle groove.
Compared with the prior art, the utility model it is showing the advantage and lies in:
the utility model provides a processing system of rich gas preliminary treatment waste water of active burnt charcoal SOx/NOx control of dry process is through getting rid of impurity in the waste water, then with waste water evaporation ammonium salt concentration, produces ammonium sulfate and the agricultural fertilizer of ammonium chloride, and then realizes waste water zero release and resource recovery.
Drawings
FIG. 1 is a schematic flow diagram of a treatment system for treating wastewater by using dry-process activated coke/carbon desulfurization and denitrification rich gas pretreatment;
FIG. 2 is a schematic flow diagram of a pretreatment unit of a treatment system for the dry-process activated coke/carbon desulfurization and denitrification gas-rich pretreatment of wastewater;
FIG. 3 is a schematic view of the flow of an ammonium salt recovery unit of the treatment system for the dry-process activated coke/carbon desulfurization and denitrification gas-rich pretreatment wastewater of the utility model;
the reference numerals are explained below: 1-pH adjusting tank, 2-first flocculation reaction tank, 3-first sedimentation tank, 4-first sludge pump, 5-second flocculation reaction tank, 6-second sedimentation tank, 7-second sludge pump, 8-plate and frame filter press, 9-evaporative crystallization device, 10-middle tank, 11-cyclone feeding pump, 12-cyclone, 13-centrifuge, 14-dryer, 15-spiral conveyer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the two devices can be directly connected or indirectly connected through an intermediate medium, and the two devices can be communicated with each other. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Combine figure 1, figure 2, figure 3, the utility model provides a processing system of rich gas preliminary treatment waste water of dry process active coke SOx/NOx control, this system includes pretreatment unit and ammonium salt recovery unit, and wherein, pretreatment unit is used for carrying out the preliminary treatment to waste water (also known as raw water), and its main function includes: removing harmful F-ions, removing a large amount of dust in raw water, reducing the total hardness of the raw water, performing sludge concentration on the precipitated sludge, and providing clear liquid for a subsequent working section; and the ammonium salt recovery unit is used for recovering ammonium salt from the pretreated wastewater. The two units are explained below.
The pretreatment unit of the wastewater treatment system comprises a PH adjusting tank 1, a flocculation reaction tank, a sedimentation tank, a sludge pump and a plate-and-frame filter press 8.
And the pH adjusting tank 1 is used for receiving the wastewater raw water and carrying out pH adjustment treatment and defluorination treatment on the wastewater raw water. Specifically, raw water is conveyed to a pH adjusting tank 1 from a wastewater buffer tank through a wastewater conveying pump, lime slurry is added, and after full reaction through stirring, CaF is generated2The wastewater after precipitation flows to a flocculation reaction tank automatically.
The inlet of the flocculation reaction tank is connected with the pH adjusting tank 1, and the outlet of the flocculation reaction tank is connected with the sedimentation tank, so that particles with flocculation performance in the wastewater are aggregated to form a larger flocculating constituent, and simultaneously, the hardness of the wastewater is reduced; specifically, after the effluent from the pH adjusting tank 1 enters a flocculation reaction tank, a flocculating agent such as PAC and PAM is added into the flocculation reaction tank, and after proper stirring, large-particle flocculate is formedAutomatically flowing to a sedimentation tank; simultaneously, and by adding carbonate such as Na2CO3The hardness is removed.
The sedimentation tank is used for separating flocculate and water, an inlet of the sedimentation tank is connected with the flocculation reaction tank, a clear liquid outlet of the sedimentation tank is connected with a subsequent ammonium salt recovery unit, and a sludge outlet of the sedimentation tank is connected with a sludge pump; specifically, in the sedimentation tank, the particulate matters (flocculates) formed by flocculation reaction sink in water due to the fact that gravity is larger than buoyancy, and then are separated from water, the flocculates in the sedimentation tank deposit toward the bottom to form sludge, the sludge is sucked out by a sludge pump and conveyed to a plate-and-frame filter press for treatment, and the supernatant is conveyed to a subsequent ammonium salt recovery unit for further treatment. In view of the large solid content, it is preferable to use a vertical sedimentation tank which is good in sedimentation and is not easy to clog. The sedimentation tank is preferably a clarifier.
The inlet of the sludge pump is connected with the sludge outlet at the bottom of the sedimentation tank, and the outlet of the sludge pump is connected with the plate-and-frame filter press 8 and used for conveying flocculate deposited at the bottom of the sedimentation tank to the plate-and-frame filter press 8;
and the plate-and-frame filter press 8 is used for dewatering sludge at the bottom of the sedimentation tank, so that the moisture of the sludge is forced to pass through the filter medium to form filtrate, and solid particles are intercepted on the medium to form a mud cake. Preferably, the plate and frame filter press 8 is connected to the inlet of the settling tank and the filtrate can be sent to the settling tank for further treatment.
In order to better remove suspended solids and ensure the quality of the later-period recovered salt, the utility model provides an optimized implementation mode adopts a two-stage flocculation precipitation process. Namely, in the pretreatment unit, the flocculation reaction tank comprises a first flocculation reaction tank 2 and a second flocculation reaction tank 5, the sedimentation tank comprises a first sedimentation tank 3 and a second sedimentation tank 6, wherein the inlet of the first flocculation reaction tank 2 is connected with the outlet of the pH adjusting tank 1; the inlet of the first sedimentation tank 3 is connected with the outlet of the first flocculation reaction tank 2; the inlet of the second flocculation reaction tank 5 is connected with the clear liquid outlet of the first sedimentation tank 3, and the inlet of the second sedimentation tank 6 is connected with the outlet of the second flocculation reaction tank 5. Substances such as suspended matters in the wastewater can be better removed through the two-stage flocculation precipitation process, clear liquid with better quality is obtained, and a good foundation is laid for the subsequent preparation of the ammonium fertilizer.
Preferably, in the pretreatment unit, the sludge pump comprises a first sludge pump 4 and a second sludge pump 7, and the plate-and-frame filter press 8 is respectively connected with the first sedimentation tank 3 and the second sedimentation tank 6 through the first sludge pump 4 and the second sludge pump 7.
Preferably, the pretreatment unit further comprises a clear liquid tank for storing clear liquid obtained after treatment in the sedimentation tank. The clear solution groove plays a buffering role, and the wastewater is conveniently pumped into the ammonium salt recovery unit for subsequent treatment.
The ammonium salt recovery unit of the wastewater treatment system comprises an evaporative crystallization device 9, a cyclone feeding pump 11, a cyclone 12, a centrifuge 13 and a dryer 14.
And the inlet of the evaporative crystallization device 9 is connected with a clear liquid outlet of the sedimentation tank (or directly connected with a clear liquid tank outlet), and the evaporative crystallization device is used for evaporating and crystallizing the clear liquid output by the pretreatment unit, specifically, the evaporative crystallization device 9 forcibly heats the clear liquid through steam to evaporate water, and ammonium sulfate and ammonium chloride crystals are generated. Preferably, the evaporative crystallization device 9 is a triple-effect evaporator. The steam that evaporates can be, partly continue to heat and produce high temperature steam (the clear solution that evaporates that is used, is equivalent to steam secondary reuse), and another part is condensed and is discharged and enter regeneration gas purification preprocessing device and use.
A cyclone 12, the inlet of which is connected with the evaporative crystallization device 9 through a cyclone feeding pump 11 and is used for dehydrating the slurry generated by the evaporative crystallization device 9; specifically, after the slurry in the evaporative crystallization device 9 reaches a certain solid content (generally about 85%), the slurry is sent to a cyclone 12 through a cyclone feeding pump 11 for preliminary solid-liquid separation; the separated liquid can flow back to the flocculation reaction tank for treatment, and can flow back to the first flocculation reaction tank 2, also can flow back to the second flocculation reaction tank 5, and preferably flows back to the second flocculation reaction tank 5 for treatment; the separated mixed salt crystals of ammonium sulfate and ammonium chloride (still containing a considerable amount of water) are sent to a subsequent device, namely a centrifuge 13, for further solid-liquid separation treatment.
The inlet of the centrifuge 13 is connected with the outlet of the cyclone 12, and the outlet of the centrifuge is connected with the dryer 14 for further separating ammonium salt crystals and moisture; the separated liquid can flow back to the flocculation reaction tank for treatment, and can flow back to the first flocculation reaction tank 2, also can flow back to the second flocculation reaction tank 5, and preferably flows back to the second flocculation reaction tank 5 for treatment; the separated ammonium salt crystals (still having a certain amount of moisture) are dried in a subsequent device, i.e., a dryer 14.
And the inlet of the drier 14 is connected with the centrifuge 13 and used for drying ammonium salt, further reducing the water content of the material, producing dry ammonium fertilizer with the water content lower than 1 percent and being used for agricultural fertilizer. In the preferred embodiment of the present invention, the drying machine 14 is connected to the centrifuge 13 through the screw conveyor 15, and the ammonium salt crystals obtained by the centrifuge 13 are sent to the drying machine 14 through the screw conveyor 15 for drying treatment.
Preferably, the ammonium salt recovery unit of the wastewater treatment system further comprises an intermediate tank 10, an inlet of which is connected with the evaporative crystallization device 9, an outlet of which is connected with a cyclone 12, and a stirrer is arranged in the intermediate tank; for receiving the slurry discharged from the evaporative crystallization device 9; the intermediate tank 10 can play a role in buffering, and is beneficial to the stable operation of the system.
A tail gas washing device is adopted for drying tail gas, and the content of outlet dust is lower than 10mg/Nm3And then directly discharging the atmosphere. To obtain the ammonium fertilizer, steam is required to heat in the dryer 14 to further reduce the water content of the ammonium salt, and the resulting tail gas is the dry tail gas. The amount of waste water generated by washing is small, and the waste water can be directly returned to the pH adjusting tank 1 for treatment.
The evaporated condensed water, namely the moisture generated by the condensation of the steam in the evaporation crystallization device 9 can be returned to the regeneration gas purification pretreatment device for use, so that the whole system can realize the discharge of no waste water.
The utility model discloses through the trial and error verification, gained satisfied effect on probation.
The utility model also provides a processing method of rich gas preliminary treatment waste water of dry process active coke/charcoal SOx/NOx control, including following step:
step one, adding lime slurry into the wastewater, adjusting the pH of the wastewater and generating CaF2Removing fluorine by precipitation;
step two, adding a flocculating agent and carbonate into the wastewater treated in the step one to reduce the hardness of the wastewater and enable particles with flocculation performance in the wastewater to aggregate to form larger flocculating constituents;
step three, carrying out precipitation treatment on the wastewater treated in the step two to remove the flocculating constituent in the wastewater, so as to obtain clear liquid and sludge;
pumping the sludge obtained in the step three to a plate-and-frame filter press for treatment to obtain a filter cake and filtrate, and returning the filtrate to the precipitation treatment;
and step five, carrying out evaporative crystallization treatment on the clear liquid obtained in the step three, carrying out solid-liquid separation treatment after a certain solid content is reached, and finally drying to obtain an ammonium fertilizer, namely a mixture of ammonium sulfate and ammonium chloride, wherein the purity can reach 98%.
In the above treatment method, as a preferred embodiment, in the fifth step, the solid content is 80% or more, and the solid-liquid separation treatment is performed by sequentially passing a solid-liquid mixture (i.e., slurry) obtained by the evaporation crystallization treatment through a cyclone and a centrifuge; the separated liquid returns to be flocculated.
In the above treatment method, as a preferred embodiment, in step five, a part of the steam obtained by evaporating the clear liquid in the evaporation and crystallization treatment process is continuously heated to generate high-temperature steam, and the other part of the steam is condensed and discharged to enter a regeneration gas purification pretreatment device for use.
The treatment method can achieve the aims of simultaneously realizing ammonium salt fertilizer recovery and zero wastewater discharge. The above method may be implemented by the processing system described above.
Examples
As shown in fig. 1, fig. 2 and fig. 3, the treatment system for the rich gas pretreatment wastewater of desulfurization and denitrification by dry process activated coke/charcoal in the present embodiment includes a pretreatment unit and an ammonium salt recovery unit.
The pretreatment unit comprises a PH adjusting tank 1, a first flocculation reaction tank 2, a first sedimentation tank 3, a first sludge pump 4, a second flocculation reaction tank 5, a second sedimentation tank 6, a second sludge pump 7 and a plate and frame filter press 8. Wherein, the entry of first flocculation reaction tank 2 and the exit linkage of pH equalizing basin 1, the entry of first sedimentation tank 3 and the exit linkage of first flocculation reaction tank 2, the entry of second flocculation reaction tank 5 and the clear liquid exit linkage of first sedimentation tank 3, the entry of second sedimentation tank 6 and the exit linkage of second flocculation reaction tank 5, the sludge outlet of the bottom of first sedimentation tank 3, second sedimentation tank 6 is respectively through first sludge pump 4, second sludge pump 7 is connected with plate and frame filter press 8, the filtrating export of plate and frame filter press 8 and the entry linkage of first sedimentation tank 3. In this embodiment, the first sedimentation tank 3 and the second sedimentation tank 6 both employ vertical sedimentation tanks.
The ammonium salt recovery unit comprises an evaporative crystallization device 9, an intermediate tank 10, a cyclone feeding pump 11, a cyclone 12, a centrifuge 13 and a dryer 14. Wherein, the inlet of the evaporation crystallization device 9 is connected with the clear liquid outlet of the second sedimentation tank 6, the outlet of the evaporation crystallization device 9 is connected with the intermediate tank 10, the inlet of the cyclone 12 is connected with the outlet of the intermediate tank 10 through the cyclone feeding pump 11, the liquid outlet of the cyclone 12 is connected with the inlet of the second flocculation reaction tank 5, the inlet of the centrifuge 13 is connected with the outlet of the cyclone 12 (the outlet of ammonium salt crystallization slurry obtained by primary solid-liquid separation), the liquid outlet of the centrifuge 13 is connected with the inlet of the second flocculation reaction tank 5, and the outlet of the centrifuge 13 (the outlet of ammonium salt crystallization) is connected with the dryer 14 through the screw conveyor 15. In this embodiment, the evaporative crystallization apparatus 9 employs a triple-effect evaporator.
When the system is operated, raw water is conveyed to the pH adjusting tank 1 from the wastewater buffer tank through the wastewater conveying pump, lime slurry is added, and after full reaction through stirring, CaF is generated2The wastewater after precipitation flows to the first flocculation reaction tank 2 automatically. After the effluent of the pH adjusting tank 1 enters a first flocculation reaction tank 2, carbonate such as Na is added into the flocculation reaction tank2CO3To get rid of the hardness, add flocculating agent such as PAC and PAM simultaneously, through proper stirring, flow to first sedimentation tank 3 certainly after forming the flocculation of large granule, in first sedimentation tank 3, particulate matter (flocculation) that flocculation reaction formed sinks because gravity is greater than buoyancy in aqueous, and then breaks away from water, and the flocculation deposits towards the bottom and forms mud, is siphoned by first sludge pump 4, is carried to plate and frame filter press 8 and handles, and the supernatant fluidThen the wastewater is conveyed to a second flocculation reaction tank 5 for a second flocculation treatment. Adding flocculating agents such as PAC and PAM into the second flocculation reaction tank 5, properly stirring to form large-particle flocculate, enabling the wastewater to automatically flow to the second sedimentation tank 6, wherein in the second sedimentation tank 6, the particles (flocculate) formed by flocculation reaction sink in water because the gravity is greater than buoyancy, and then separate from water, the flocculate deposits to form sludge towards the bottom, is sucked out by a second sludge pump 7 and is conveyed to a plate and frame filter press 8 for treatment, and the supernatant is conveyed to an evaporation crystallization device 9 for further treatment.
The pretreated wastewater enters an evaporative crystallization device 9, water is evaporated by steam forced heating to generate ammonium sulfate and ammonium chloride crystals, when the slurry in the evaporative crystallization device 9 reaches a certain solid content (more than 80%), the slurry is sent to a middle tank 10, and is sent to a cyclone 12 through a cyclone feeding pump 11 for preliminary solid-liquid separation, and then is sent to a centrifuge 13 for further separation of ammonium salt crystals and water, and finally is sent to a dryer 14 through a screw conveyor 15 for drying to obtain an ammonium salt fertilizer, wherein the water content of the fertilizer is lower than 1%, the purity of the fertilizer can reach 98%, and the fertilizer can be used for agriculture; and liquid obtained by the separation of the cyclone 12 and the centrifuge 13 flows back to the second flocculation reaction tank 5 for treatment, so that no waste water is discharged out of the system.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of the invention or which are equivalent to the scope of the invention are embraced by the invention.
Claims (10)
1. A treatment system for dry-method active coke/carbon desulfurization and denitrification rich gas pretreatment wastewater, which is characterized in that,
the system comprises a pretreatment unit and an ammonium salt recovery unit, wherein,
the preprocessing unit includes:
the pH adjusting tank is used for receiving the wastewater raw water and carrying out pH adjustment treatment and defluorination treatment on the wastewater raw water;
the inlet of the flocculation reaction tank is connected with the pH adjusting tank and is used for reducing the hardness of the wastewater and carrying out flocculation reaction;
the inlet of the sedimentation tank is connected with the flocculation reaction tank, the clear liquid outlet of the sedimentation tank is connected with the ammonium salt recovery unit, and the sludge outlet of the sedimentation tank is connected with a sludge pump;
the sludge pump is arranged between the inlet and the sludge outlet of the sedimentation tank;
the plate-and-frame filter press is connected with the outlet of the sludge pump and is used for dewatering sludge at the bottom of the sedimentation tank;
the ammonium salt recovery unit comprises:
the inlet of the evaporative crystallization device is connected with the clear liquid outlet of the sedimentation tank and is used for evaporating and crystallizing the clear liquid output by the pretreatment unit;
the inlet of the cyclone is connected with the evaporative crystallization device through a cyclone feeding pump and is used for dehydrating the slurry generated by the evaporative crystallization device;
the inlet of the centrifugal machine is connected with the outlet of the cyclone and is used for further separating ammonium salt crystals and moisture;
and the inlet of the dryer is connected with the outlet of the centrifuge and used for drying ammonium salt and producing the dry ammonium fertilizer.
2. The system for treating the dry activated coke/charcoal desulfurization and denitrification rich gas pretreatment wastewater according to claim 1,
a filtrate outlet of the plate-and-frame filter press is connected with an inlet of the sedimentation tank;
the liquid outlet of the cyclone is connected with the inlet of the flocculation reaction tank;
and a liquid outlet of the centrifuge is connected with an inlet of the flocculation reaction tank.
3. The system for treating the wastewater by the dry-method activated coke/charcoal desulfurization and denitrification rich gas pretreatment according to claim 1 or 2,
in the pretreatment unit, the flocculation reaction tank comprises a first flocculation reaction tank and a second flocculation reaction tank, the sedimentation tank comprises a first sedimentation tank and a second sedimentation tank, wherein,
the inlet of the first flocculation reaction tank is connected with the outlet of the pH adjusting tank, and the inlet of the first sedimentation tank is connected with the outlet of the first flocculation reaction tank;
the inlet of the second flocculation reaction tank is connected with the clear liquid outlet of the first sedimentation tank, and the inlet of the second sedimentation tank is connected with the outlet of the second flocculation reaction tank;
the sludge pump comprises a first sludge pump and a second sludge pump, and the plate-and-frame filter press is respectively connected with the first sedimentation tank and the second sedimentation tank through the first sludge pump and the second sludge pump.
4. The system for treating the dry activated coke/charcoal desulfurization and denitrification rich gas pretreatment wastewater according to claim 3, wherein a liquid outlet of the cyclone is connected with an inlet of the second flocculation reaction tank; and a liquid outlet of the centrifuge is connected with an inlet of the second flocculation reaction tank.
5. The system for treating the wastewater subjected to the dry-method activated coke/carbon desulfurization and denitrification rich gas pretreatment as recited in claim 1 or 2, wherein the sedimentation tank is a vertical-flow sedimentation tank.
6. The system for treating the wastewater through the dry-method activated coke/carbon desulfurization and denitrification rich gas pretreatment as recited in claim 5, wherein the sedimentation tank is a clarification tank.
7. The system for treating the wastewater by the dry-method activated coke/charcoal desulfurization and denitrification rich gas pretreatment according to claim 1 or 2,
the pretreatment unit also comprises a clear liquid groove used for storing clear liquid obtained after the treatment of the sedimentation tank.
8. The system for treating the wastewater from the pretreatment of rich gas in desulfurization and denitrification by dry activated coke/char according to any one of claims 1 and 2,
the evaporative crystallization device is a triple-effect evaporator.
9. The system for treating the wastewater by the dry-method activated coke/charcoal desulfurization and denitrification rich gas pretreatment according to claim 1 or 2,
the ammonium salt recovery unit further comprises: the drying machine is connected with the centrifugal machine through the spiral conveyor.
10. The system for treating wastewater by rich gas pretreatment for desulfurization and denitrification by dry activated coke/char according to claim 1 or 2,
the ammonium salt recovery unit further comprises: the inlet of the middle groove is connected with the evaporative crystallization device, the outlet of the middle groove is connected with the cyclone, and a stirrer is arranged in the middle groove.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110316896A (en) * | 2019-08-13 | 2019-10-11 | 北京中航泰达环保科技股份有限公司 | Dry reactive coke/charcoal desulphurization denitration rich gas pretreated waste water processing system |
| CN113307435A (en) * | 2021-05-25 | 2021-08-27 | 中煤能源研究院有限责任公司 | Dynamic PCA (principal component analysis) -based evaporative crystallization solid-liquid separation system and method |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110316896A (en) * | 2019-08-13 | 2019-10-11 | 北京中航泰达环保科技股份有限公司 | Dry reactive coke/charcoal desulphurization denitration rich gas pretreated waste water processing system |
| CN113307435A (en) * | 2021-05-25 | 2021-08-27 | 中煤能源研究院有限责任公司 | Dynamic PCA (principal component analysis) -based evaporative crystallization solid-liquid separation system and method |
| CN113307435B (en) * | 2021-05-25 | 2022-12-13 | 中煤能源研究院有限责任公司 | Dynamic PCA (principal component analysis) -based evaporative crystallization solid-liquid separation system and method |
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