CN112499710B - Device and method for purifying ammonia water by using ammonia-containing wastewater - Google Patents
Device and method for purifying ammonia water by using ammonia-containing wastewater Download PDFInfo
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- CN112499710B CN112499710B CN202011124552.5A CN202011124552A CN112499710B CN 112499710 B CN112499710 B CN 112499710B CN 202011124552 A CN202011124552 A CN 202011124552A CN 112499710 B CN112499710 B CN 112499710B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/10—Separation of ammonia from ammonia liquors, e.g. gas liquors
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/046—Treatment of water, waste water, or sewage by heating by distillation or evaporation under vacuum produced by a barometric column
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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Abstract
The invention discloses a device and a method for purifying ammonia water by using ammonia-containing wastewater, comprising an ammonia extraction tower, a pressure transmitter, a vacuumizing device, an ammonia-containing steam condensing device and an ammonia water recovery device; the pressure transmitter is arranged at the top of the ammonia extraction tower and is linked with the vacuumizing device to synchronously extract ammonia and water vapor in the ammonia extraction tower; the inlet of the ammonia-containing water vapor condensing device is connected with the ammonia water and water vapor outlet at the top of the ammonia extraction tower, and the outlet of the ammonia water and water vapor condensing device is connected with an ammonia water recovery device; the ammonia water recovery device is connected with the vacuumizing device. The invention realizes the simultaneous extraction of ammonia and water vapor in the ammonia extraction tower, and can change the proportion of ammonia and water vapor in the ammonia extraction tower extracted by the vacuum pump according to the pressure value set by the pressure transmitter to the top of the ammonia extraction tower, thereby obtaining the ammonia water with set concentration and realizing the free selection of the concentration of the extracted ammonia water; the invention directly utilizes the water vapor in the ammonia extraction tower, does not need to supplement fresh water, reduces sewage discharge and saves water resources.
Description
Technical Field
The invention relates to the technical field of chemical production, in particular to a device and a method for purifying ammonia water by using ammonia-containing wastewater.
Background
The ammonia extraction tower is a water treatment facility for producing ammonia water by utilizing ammonia-containing wastewater. The ammonia gas is volatilized by heating the tower bottom of a conventional ammonia extraction tower, the ammonia gas and water vapor are separated under the action of a filler by utilizing the height of the tower, the pressure of 0.2-0.3 MPa is formed in the tower under the action of distillation, the ammonia gas is discharged from the tower top, and the ammonia gas is absorbed to generate the ammonia water under the conditions of a condenser and fresh water supplement. In addition, the additional fresh water supply needs to increase equipment investment and consume water resources, and the moisture in the original ammonia-containing wastewater is treated again, which increases the cost.
Disclosure of Invention
The invention mainly solves the technical problem of providing a device and a method for purifying ammonia water by using ammonia-containing wastewater, directly extracting ammonia water with required concentration without supplementing fresh water, and solving the defects of unstable concentration, high cost and the like of the produced ammonia water when the ammonia water is produced by using the ammonia-containing wastewater in the existing ammonia extraction tower.
In order to solve the technical problems, the invention adopts a technical scheme that: provided is an apparatus for purifying ammonia water using ammonia-containing wastewater, comprising:
the ammonia extraction tower, the pressure transmitter, the vacuumizing device, the ammonia-containing steam condensing device and the ammonia water recovery device; wherein the pressure transmitter is installed at the top of the ammonia extraction tower to adjust the tower top pressure in the ammonia extraction tower; the pressure transmitter is in linkage connection with the vacuumizing device to adjust the rotating speed of the vacuumizing device and synchronously pump out ammonia gas and water vapor in the ammonia extracting tower; the inlet of the ammonia-containing water vapor condensing device is connected with the ammonia water and water vapor outlet at the top of the ammonia extracting tower, and the outlet of the ammonia water and water vapor condensing device is connected with the ammonia water recovery device; the ammonia water recovery device is connected with the vacuumizing device.
In a preferred embodiment of the invention, the ammonia-containing water vapor condensing device comprises an ammonia-containing water vapor precooler and a ring plate condenser which are sequentially connected along the flow direction of the ammonia-containing water vapor.
In a preferred embodiment of the present invention, the ammonia water recovery device comprises an ammonia water condenser, an ammonia water storage kettle, an ammonia water circulating pump and an ammonia water storage tank; the inlet of the ammonia water condenser is connected with the outlet of the ring plate condenser, and the outlet of the ammonia water condenser is connected with the inlet of the ammonia water storage kettle; the outlet of the ammonia water storage kettle is connected with the inlet of the ammonia water condenser through a pipeline; the ammonia water circulating pump is arranged on a pipeline between an outlet of the ammonia water storage kettle and an inlet of the ammonia water condenser; the conveying pipe of the ammonia water circulating pump is also connected with a bypass discharge pipe communicated with the ammonia water storage tank; the top end of the ammonia water storage kettle is connected with the vacuumizing device; the ammonia water is stored up and is installed the level gauge on the cauldron, install the bleeder on the bypass discharge pipe, the level gauge with the bleeder linkage is connected.
In a preferred embodiment of the present invention, the apparatus further comprises a non-condensable gas processing apparatus; wherein, the non-condensable gas processing apparatus with the aqueous ammonia stores up the top of cauldron and is connected.
In a preferred embodiment of the invention, the non-condensable gas treatment device comprises a gaseous condenser, a buffer tank and a water replenishing siphon pump set; the inlet of the gaseous condenser is connected with a gas outlet at the top end of the ammonia water storage kettle, the outlet of the gaseous condenser is connected with the buffer tank, one end of the water replenishing siphon pump unit is connected with the buffer tank, and the discharge pipeline of the water replenishing siphon pump unit is connected with the ammonia condenser and the vacuumizing device; the buffer tank is provided with an exhaust gas discharge outlet, and the exhaust gas discharge outlet is connected with an exhaust gas detection device.
In a preferred embodiment of the invention, the device also comprises a raw material siphon delivery pump set, a pH value adjusting barrel, a raw material siphon feeding tower delivery pump set, a preheater and a liquid caustic soda storage tank; the raw material siphon delivery pump set, the pH value adjusting barrel, the raw material siphon intake tower delivery pump set and the preheater are sequentially connected along the flow direction of wastewater, and the liquid caustic soda storage tank is connected with the pH value adjusting barrel; the pH value adjusting barrel comprises a pH value rough adjusting stirring barrel and a pH value fine adjusting stirring barrel, wherein the pH value rough adjusting stirring barrel and the pH value fine adjusting stirring barrel are sequentially connected along the flow direction of wastewater, and the liquid caustic soda storage tank is respectively connected with the pH value rough adjusting stirring barrel and the pH value fine adjusting stirring barrel.
In order to solve the technical problem, the invention adopts another technical scheme that: the method comprises the steps of setting a pressure value at the top of the ammonia extraction tower through the pressure transmitter, adjusting the rotating speed of the vacuumizing device in a linkage manner, simultaneously extracting and cooling ammonia and water vapor in the ammonia extraction tower under the action of the vacuumizing device, and treating the ammonia and the water vapor by using an ammonia water recovery device to obtain the ammonia water.
In a preferred embodiment of the invention, the pressure value at the top of the ammonia extracting tower is changed through the pressure transmitter, and the rotating speed of the vacuumizing device is changed in a linkage manner, so that the extraction ratio of the ammonia and the water vapor is changed, and the concentration of the purified ammonia water is changed.
In a preferred embodiment of the invention, the pressure value is between 0.02 and-0.02 MPa.
In a preferred embodiment of the present invention, the method further comprises the following steps:
a. pretreatment of ammonia-containing wastewater: pumping the ammonia-containing wastewater in the storage tank to the pH value rough adjustment stirring barrel and the pH value fine adjustment stirring barrel by using a raw material siphon delivery pump for two-stage treatment, so that the pH value of the ammonia-containing wastewater is adjusted to 11-11.5;
b. and (3) ammonia water recovery treatment: condensing the ammonia-containing water vapor subjected to steam stripping condensation through an ammonia water condenser, storing the ammonia-containing water vapor into an ammonia water storage kettle, pumping the ammonia water in the ammonia water storage kettle into the ammonia water condenser through an ammonia water circulating pump for secondary condensation and recovery, and controlling a drain valve on a bypass drain pipe through linkage of a liquid level meter on the ammonia water storage kettle to store the ammonia water into an ammonia water storage tank;
c. and (3) recycling noncondensable gas: store up the noncondensable gas of cauldron top with the aqueous ammonia and lead to in the gaseous state condenser, discharge the buffer tank after the condensation, liquid in the buffer tank passes through moisturizing siphon pump package partly backward flow to the aqueous ammonia condenser in the condensation retrieve the aqueous ammonia, and another part returns to the buffer tank through evacuating device and gaseous condenser again, and the tail gas in the buffer tank passes through the exhaust emission outlet and discharges under the detection of exhaust gas detection device.
The beneficial effects of the invention are: the invention relates to a device and a method for purifying ammonia water by using ammonia-containing wastewater, wherein a pressure transmitter and a vacuumizing device are arranged on the top of an ammonia extraction tower of the purifying device, the pressure transmitter is linked with the vacuumizing device, and the vacuumizing device rotates to simultaneously extract ammonia and water vapor in the ammonia extraction tower; the purification method can change the proportion of ammonia and water vapor in the ammonia extraction tower extracted by the vacuum pump according to the pressure value set by the pressure transmitter to the top of the ammonia extraction tower, thereby obtaining ammonia water with set concentration and realizing the free selection of the concentration of the extracted ammonia water; the purification device and the purification method directly utilize the water vapor in the ammonia extraction tower, do not need to supplement fresh water, fully utilize waste water resources, reduce sewage discharge, save water resources and save resources, and are beneficial to industrial production.
Drawings
FIG. 1 is a schematic view showing a connection structure of a preferred embodiment of an apparatus for purifying aqueous ammonia using wastewater containing ammonia according to the present invention;
the components in the drawings are numbered as follows: 1. the system comprises a storage tank, 2 a raw material siphon delivery pump set, 3.pH value rough adjustment stirring barrel, 4.pH value fine adjustment stirring barrel, 5 a raw material siphon intake tower delivery pump set, 6 a preheater, 7 a filter, 8 an ammonia extraction tower, 9 a pressure transmitter, 10 an ammonia-containing water vapor precooler, 11 a ring plate condenser, 12 a water ring vacuum pump, 13 an ammonia water condenser, 14 an ammonia water storage tank, 15 an ammonia water circulating pump, 16 an ammonia water storage tank, 17 a gas condenser, 18 a water supplement siphon pump set, 19 a buffer tank, 20 a cooling water circulating pump, 21 a cooling water tank, 22 a cooling tower, 23 an exhaust valve, 24 a common cooling circulating water inlet valve, 25 a liquid level meter, 26 a forced circulation pump, 27 a reflux adjusting valve and 28 a tower bottom bin liquid level meter.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
Referring to fig. 1, an embodiment of the present invention includes:
the invention discloses a device for purifying ammonia water by using ammonia-containing wastewater, which comprises:
containing NH 4 A storage tank 1 for Cl wastewater (ammonia-containing wastewater), a raw material siphon delivery pump set 2, a pH value rough adjustment stirring barrel 3, a pH value fine adjustment stirring barrel 4, a raw material siphon inlet tower delivery pump set 5 a preheater 6, a filter 7, an ammonia extracting tower 8, a pressure transmitter 9, an ammonia-containing steam precooler 10, a ring plate condenser 11, a water ring vacuum pump 12, an ammonia water condenser 13,An ammonia water storage kettle 14, an ammonia water circulating pump 15, an ammonia water storage tank 16, a gaseous condenser 17, a water replenishing siphon pump unit 18, a buffer tank 19, a cooling water circulating pump 20, a cooling water pool 21 and a cooling tower 22.
The storage tank 1 is sequentially connected with the raw material siphon delivery pump unit 2, the pH value rough adjustment stirring barrel 3, the pH value fine adjustment stirring barrel 4, the raw material siphon intake tower delivery pump unit 5, the preheater 6, the filter 7 and the ammonia extraction tower 8 through pipelines, and the treated ammonia-containing wastewater is delivered into the ammonia extraction tower 8 for stripping; the pH value rough adjustment stirring barrel 3 and the pH value fine adjustment stirring barrel 4 are respectively communicated with a liquid caustic soda storage tank 23, and the pH value of the ammonia-containing wastewater in the pH value rough adjustment stirring barrel 3 and the pH value fine adjustment stirring barrel 4 is adjusted to 11-11.5 through liquid caustic soda.
The pressure transmitter 9 is arranged at the top of the ammonia extraction tower 8 and is used for adjusting the gas pressure at the top of the ammonia extraction tower; the bottom of the ammonia extraction tower 8 is connected with a heating system, such as a hot steam gas source, and the heating temperature at the bottom of the tower is adjusted to be 95-100 ℃; and a forced circulation system at the bottom of the ammonia extraction tower 8 is also arranged at the bottom of the ammonia extraction tower, a forced circulation pump 26 of the forced circulation system is linked with a tower bottom storage bin liquid level meter 28, the liquid level at the bottom of the tower is controlled at 85%, and redundant wastewater is discharged and collected through a pipeline.
The vacuumizing device is a water ring vacuum pump 12, the water ring vacuum pump 12 is in linkage connection with a pressure transmitter 9 at the top of the ammonia extraction tower 8, after the pressure transmitter 9 sets the pressure at the top of the ammonia extraction tower 8, the rotating speed of the water ring vacuum pump 12 is adjusted under the action of a pressure value, and ammonia and water vapor in the ammonia extraction tower 8 are simultaneously extracted into the ammonia-containing water vapor condensing device in proportion to be condensed under the action of the water ring vacuum pump 12. The water ring vacuum pump 12 is also connected with an ammonia water storage kettle 14 and a buffer tank 19.
Carry the discharge pipe at ammonia tower 8 top and be connected with the ammonia vapor condensing equipment that contains, the ammonia vapor condensing equipment that contains includes along the ammonia vapor flow direction and connect gradually the ammonia vapor precooler 10 and the loop plate condenser 11 that set up, the export and the ammonia water recovery unit of loop plate condenser are connected. The ammonia water recovery device comprises an ammonia water condenser 13, an ammonia water storage kettle 14, an ammonia water circulating pump 15 and an ammonia water storage tank 16; an inlet of the ammonia water condenser 13 is connected with an outlet of the ring plate condenser 11, and an outlet of the ammonia water condenser 13 is connected with an inlet of the ammonia water storage kettle 14; an outlet of the ammonia water storage kettle 14 is connected with an inlet of the ammonia water condenser 13 through a pipeline; the ammonia water circulating pump 15 is installed on a pipeline between the outlet of the ammonia water storage kettle 14 and the inlet of the ammonia water condenser 13; a bypass discharge pipe is also connected to the delivery pipe of the ammonia water circulating pump 15 and is communicated with the ammonia water storage tank 16, and a discharge valve 23 is mounted on the bypass discharge pipe; and a liquid level meter 25 is arranged on the ammonia water accumulation kettle 14, and the liquid level meter 25 is in linkage connection with the discharge valve 23. When the liquid level in the ammonia water storage tank 14 exceeds the high liquid level of the liquid level meter 25, the discharge valve 23 is opened, the ammonia water in the pipeline partially flows into the ammonia water storage tank 16, the discharge valve 23 on the bypass pipe is closed until the liquid level meter 25 indicates that the ammonia water amount in the ammonia water storage tank 14 is the medium liquid level, and when the liquid level meter 24 indicates that the ammonia water amount in the ammonia water storage tank 14 is the low liquid level, the ammonia water circulating pump is started.
The device also comprises a non-condensable gas treatment device, wherein the non-condensable gas treatment device is connected with the top end of the ammonia water storage kettle, and specifically comprises a gas condenser 17, a buffer tank 19 and a water replenishing siphon pump set 18; wherein, gaseous state condenser 17's entry with the gaseous outlet that 14 tops were deposited in the aqueous ammonia is connected, gaseous state condenser 17's export with buffer tank 19 is connected, 18 one end of moisturizing siphon pump package are connected buffer tank 19, and its discharge line connects ammonia condenser 13 and evacuating device 12. The non-condensable gas in the ammonia water accumulation kettle 14 firstly enters a gas condenser 17 for condensation and then enters a buffer storage tank 19, a waste gas discharge outlet is formed in the buffer storage tank 19, a waste gas detection device is connected to the waste gas discharge outlet, and waste gas which does not harm air is discharged through detection; and part of the liquid in the buffer tank 19 is sent back to the ammonia water condenser for condensation and recovery through a water replenishing siphon pump set 18, and the other part of the liquid is absorbed to the water ring vacuum pump 12 and is sent to the buffer tank 19 for collection through an exhaust pipe of the water ring vacuum pump 12 and the gas condenser 17.
And the cooling water circulating device comprises a cooling water circulating pump 20, a cooling water pool 21 and a cooling tower 22. The cooling tower 22 is located the top of cooling water pool 21, cooling water circulating pump 20 is installed on the outlet pipeline of cooling water pool 21, carry cooling water in proper order extremely the aqueous ammonia holds up cauldron 14, gaseous state condenser 17 and aqueous ammonia condenser 13, and the final rethread cooling tower 22 flows back to cooling water pool 21, forms circulation path.
The invention also discloses a method for purifying ammonia water by using the ammonia-containing wastewater purification device, which has the purification principle that: the pressure value of the top of the ammonia extraction tower 9 is set through the pressure transmitter 9, the rotating speed of the water ring vacuum pump 12 is adjusted in a linkage mode, ammonia and water vapor in the ammonia extraction tower 8 are simultaneously extracted and cooled in proportion according to the set pressure under the action of the water ring vacuum pump, and the ammonia water is obtained through treatment of an ammonia water recovery device. The ammonia water purification method does not need to supplement fresh water, directly utilizes the water vapor in the ammonia extraction tower to replace the fresh water, fully utilizes the wastewater resource, reduces the sewage discharge, and can change the proportion of ammonia and water vapor by adjusting the pressure at the top of the ammonia extraction tower so as to obtain the ammonia water with the required concentration. In general, the higher the pressure value set at the top of the ammonia stripping column, the higher the concentration of the obtained ammonia water, and conversely, the lower the concentration of the ammonia water.
Specifically, the purification method comprises the steps of;
1. starting the cooling circulation water pump 20 to recover the cooling circulation water from the cooling water tank 21 → the spacer of the ammonia storage tank 14 → the tube layer of the gas condenser 17 → the shell layer of the ammonia condenser 13 → the cooling tower 22 → the cooling water tank 21;
and opening a common cooling circulating water inlet valve 24 to make the cooling water → the outer sleeve of the plate bending condenser 11 → the shell of the ammonia-containing water vapor precooler 10 → flow back to the cooling water return pool 25.
2. Adjusting the pressure value of the pressure transmitter 9 to be within the range of the set pressure value (0.02 to-0.02 MPa), starting the water ring vacuum pump 12, and enabling the water ring vacuum pump 12 to be linked with the pressure transmitter at the top of the ammonia extraction tower 8, so that the ammonia-containing water vapor at the top of the tower is discharged from the top of the tower → the pipe layer of the ammonia-containing water vapor precooler 10 → the inner layer of the coil plate condenser 11 → the pipe inner layer of the ammonia water condenser 13 → the ammonia water accumulation kettle 14 → the non-condensable gas in the ammonia water accumulation kettle → the gas condenser 17 → the buffer tank 19 → the waste gas discharge port on the buffer tank, and the non-condensable gas is discharged under the monitoring of the No. 8 waste gas cylinder treatment online instrument through a negative pressure air pipe.
3. And starting a water replenishing siphon pump set 18 (synchronously starting with the water ring vacuum pump 12), so that one part of the ammonia water recovered in the buffer tank 19 is sent to the ammonia water condenser 13 for condensation and recovery, and the other part of the ammonia water is sent to the water ring vacuum pump 12, and is sent to the buffer tank 19 through the exhaust pipe of the water ring vacuum pump 12 and the gas condenser 17 for collection (the pipeline at the bottom of the buffer tank is communicated with the pipeline at the bottom of the ammonia water storage kettle, so that a proper amount of ammonia water is ensured to be contained in the buffer tank).
4. The ammonia water circulating pump 15 is started to feed the ammonia water stored in the ammonia water storage tank 14 into the tube layer of the ammonia water condenser 13, and the ammonia water is cooled and recovered together with the ammonia-containing water vapor. Under the action of the liquid level meter 25 on the ammonia water storage kettle 14, a part of ammonia water in the ammonia water storage kettle 14 is opened through a discharge valve on a bypass pipe, and a part of ammonia water is sent to the ammonia water storage tank 16 of the tank area through a pipeline for storage. Wherein, the principle of level gauge regulation and control does: the high liquid level of the liquid level meter on the ammonia water accumulation kettle opens the discharge valve on the bypass pipe, the medium liquid level closes the discharge valve of the bypass pipe, the low liquid level turns off the ammonia water circulating pump, and the low liquid level turns on the ammonia water circulating pump.
5. Starting a raw material siphon delivery pump set 2, regulating the pH value of the ammonium chloride-containing wastewater in a storage tank 1 to 11.5 under the stirring action of the ammonium chloride-containing wastewater from the storage tank 1 → the siphon delivery pump set 2 → 15 cubic pH value rough regulation stirring barrel 3 → 15 cubic pH value fine regulation stirring barrel 4 and simultaneously opening a regulating valve on a liquid caustic soda storage tank 23;
6. starting raw material siphon-type tower conveying pump set 5, and conveying the ammonium chloride-containing wastewater with the pH value within 15 cubic meters being a set value (between 11 and 11.5) to the middle upper part of an ammonia extraction tower 8 through a pipe layer of a flowmeter on a pipeline, a manual regulating valve and a preheater 6.
7. The bottom heating system (for hot steam heating) is started to keep the bottom temperature at the set temperature (between 95 and 100 ℃) (the steam regulating valve opening degree is smaller as the bottom temperature is higher, and the steam regulating valve opening degree is larger as the bottom temperature is lower).
8. Starting the tower bottom forced circulation pump 26, so that the raw materials in the tower bottom storage bin are conveyed to the filling layer section at the middle lower part of the ammonia extraction tower 8 through the pipeline and the pipeline upper reflux adjusting valve 27 under the action of the tower bottom forced circulation pump 26 and fall into the storage bin to form forced circulation; meanwhile, the liquid level of the tower bottom bin is kept at 85% by the linkage device of the liquid level meter 28 of the tower bottom bin and the backflow regulating valve 27 on the backflow pipe, and more than 85% of wastewater is conveyed to the three collecting barrels of the factory building through the pipeline and the shell layer of the preheater to be stored under the action of the regulating valve.
By the above method, the mass concentration of the recovered ammonia water changes with the pressure value at the top of the column and the concentration changes with the pressure value at the top of the column. ( Namely: the lower the pressure value, the lower the ammonia concentration, and the higher the pressure, the higher the ammonia concentration )
The invention has the following beneficial effects:
1. the method comprises the steps that a pressure transmitter is arranged at the top of an ammonia extraction tower, a pressure value is set, the rotating speed of a water ring vacuum pump is adjusted by the pressure value, ammonia and water vapor in the tower are simultaneously pumped to a condenser in proportion to be condensed to generate ammonia water with set concentration under the action of the vacuum pump, and the ammonia water with required concentration can be obtained as required;
2. the rotating speed of the vacuumizing device is changed in a linkage manner by changing the pressure value at the top of the tower, so that the pumping proportion of the ammonia and the steam is changed, the concentration of the purified ammonia is changed, and the concentration of the purified ammonia can be freely selected as required;
3. the water vapor in the tower is used for replacing fresh water, so that the waste water resource is fully utilized, and the sewage discharge is reduced;
4. fresh water is not needed to be supplemented, and water resources are saved.
The above-mentioned components are all standard components or components known to the person skilled in the art, the structure and the principle of which are known to the person skilled in the art by means of technical manuals or by means of routine tests.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally arranged when the products of the present invention are used, and are used for convenience of description and simplicity of description only, and do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The utility model provides an utilize device of ammonia-containing waste water purification aqueous ammonia which characterized in that includes:
the ammonia extraction tower, the pressure transmitter, the vacuumizing device, the ammonia-containing steam condensing device and the ammonia water recovery device; wherein the pressure transmitter is installed at the top of the ammonia extraction tower to adjust the tower top pressure in the ammonia extraction tower; the pressure transmitter is in linkage connection with the vacuumizing device to adjust the rotating speed of the vacuumizing device and synchronously pump out ammonia gas and water vapor in the ammonia extracting tower; the inlet of the ammonia-containing water vapor condensing device is connected with the ammonia water and water vapor outlet at the top of the ammonia extraction tower, and the outlet of the ammonia water and water vapor condensing device is connected with the ammonia water recovery device; the ammonia water recovery device is connected with the vacuumizing device; the ammonia water recovery device comprises an ammonia water condenser, an ammonia water storage kettle, an ammonia water circulating pump and an ammonia water storage tank; the inlet of the ammonia water condenser is connected with the outlet of the ring plate condenser, and the outlet of the ammonia water condenser is connected with the inlet of the ammonia water storage kettle; the outlet of the ammonia water storage kettle is connected with the inlet of the ammonia water condenser through a pipeline; the ammonia water circulating pump is arranged on a pipeline between an outlet of the ammonia water storage kettle and an inlet of the ammonia water condenser; the conveying pipe of the ammonia water circulating pump is also connected with a bypass discharge pipe communicated with the ammonia water storage tank; the top end of the ammonia water storage kettle is connected with the vacuumizing device; a liquid level meter is installed on the ammonia water accumulation kettle, a discharge valve is installed on the bypass discharge pipe, and the liquid level meter is in linkage connection with the discharge valve; the device also comprises a non-condensable gas treatment device; the non-condensable gas treatment device is connected with the top end of the ammonia water storage kettle; the non-condensable gas treatment device comprises a gas condenser, a buffer tank and a water replenishing siphon pump set; the inlet of the gaseous condenser is connected with a gas outlet at the top end of the ammonia water storage kettle, the outlet of the gaseous condenser is connected with the buffer tank, one end of the water supplementing siphon pump set is connected with the buffer tank, and the discharge pipeline of the water supplementing siphon pump set is connected with the ammonia water condenser and the vacuumizing device; the buffer tank is provided with an exhaust gas discharge outlet, and the exhaust gas discharge outlet is connected with an exhaust gas detection device.
2. The apparatus according to claim 1, wherein the ammonia-containing water vapor condensing means comprises an ammonia-containing water vapor pre-cooler and the ring plate condenser connected in series along the flow direction of the ammonia-containing water vapor.
3. The apparatus for purifying ammonia water from ammonia-containing wastewater according to claim 2, further comprising a raw material siphon delivery pump set, a pH value adjusting barrel, a raw material siphon inlet tower delivery pump set, a preheater and a liquid caustic soda storage tank; wherein the raw material siphon delivery pump unit, the pH value adjusting barrel, the raw material siphon inlet tower delivery pump unit and the preheater are sequentially connected along the wastewater flow direction,
the liquid caustic soda storage tank is connected with the pH value adjusting barrel; the pH value adjusting barrel comprises a pH value rough adjusting stirring barrel and a pH value fine adjusting stirring barrel, wherein the pH value rough adjusting stirring barrel and the pH value fine adjusting stirring barrel are sequentially connected along the flow direction of wastewater, and the liquid caustic soda storage tank is respectively connected with the pH value rough adjusting stirring barrel and the pH value fine adjusting stirring barrel.
4. A method for purifying ammonia water by using ammonia-containing wastewater is characterized in that the device of claim 3 is adopted, the pressure value at the top of the ammonia extraction tower is set through the pressure transmitter, the rotating speed of the vacuumizing device is adjusted in a linkage manner, ammonia and water vapor in the ammonia extraction tower are simultaneously pumped out and cooled under the action of the vacuumizing device, and the ammonia water is obtained through treatment of an ammonia water recovery device; changing the pressure value at the top of the ammonia extraction tower through the pressure transmitter, and changing the rotating speed of the vacuumizing device in a linkage manner to change the extraction proportion of the ammonia and the water vapor so as to change the concentration of the purified ammonia water; the pressure value is 0.02 to-0.02 MPa;
also comprises the following steps:
a. pretreatment of ammonia-containing wastewater: pumping the ammonia-containing wastewater in the storage tank to the pH value rough adjustment stirring barrel and the pH value fine adjustment stirring barrel by using a raw material siphon delivery pump for two-stage treatment, so that the pH value of the ammonia-containing wastewater is adjusted to 11-11.5;
b. and (3) ammonia water recovery treatment: condensing the ammonia-containing water vapor subjected to steam stripping condensation through an ammonia water condenser, storing the ammonia-containing water vapor into an ammonia water storage kettle, pumping the ammonia water in the ammonia water storage kettle into the ammonia water condenser through an ammonia water circulating pump for secondary condensation and recovery, and controlling a drain valve on a bypass drain pipe through linkage of a liquid level meter on the ammonia water storage kettle to store the ammonia water into an ammonia water storage tank;
c. and (3) recycling noncondensable gas: the ammonia water is stored in the ammonia water storage kettle, the non-condensable gas above the ammonia water storage kettle is guided into the gaseous condenser, the condensed non-condensable gas is discharged into the buffer tank, liquid in the buffer tank partially flows back into the ammonia water condenser through the water supplementing siphon pump set to be condensed and recycled, the other part returns into the buffer tank through the vacuumizing device and the gaseous condenser, and tail gas in the buffer tank is discharged through a waste gas discharge outlet under the detection of the waste gas detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011124552.5A CN112499710B (en) | 2020-10-20 | 2020-10-20 | Device and method for purifying ammonia water by using ammonia-containing wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011124552.5A CN112499710B (en) | 2020-10-20 | 2020-10-20 | Device and method for purifying ammonia water by using ammonia-containing wastewater |
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| CN115385322B (en) * | 2022-10-31 | 2023-01-20 | 沧州彩客新能源有限公司 | Preparation method and system of lithium iron phosphate anode material |
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