CN219079146U - Treatment device for ammonia-containing and carbon-containing chemical wastewater - Google Patents
Treatment device for ammonia-containing and carbon-containing chemical wastewater Download PDFInfo
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- CN219079146U CN219079146U CN202223505437.XU CN202223505437U CN219079146U CN 219079146 U CN219079146 U CN 219079146U CN 202223505437 U CN202223505437 U CN 202223505437U CN 219079146 U CN219079146 U CN 219079146U
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Abstract
The utility model discloses a treatment device for ammonia-containing and carbon-containing chemical wastewater, which solves the problems of difficult ammonia-carbon separation, high energy consumption, poor flexibility, high equipment investment and high operation cost of the existing treatment device. The technical scheme includes that the ammonia still with a tower bottom reboiler is provided, the ammonia still further comprises a feed pump, an outlet of the feed pump is respectively connected with a first feed port at the tower top of the ammonia still and a feed preheater tube side or shell side, and the tube side or shell side of the feed preheater is connected with a second feed port at the upper part of the ammonia still; the middle gas outlet of the ammonia distillation tower is connected with a reflux liquid inlet below the middle gas outlet of the ammonia distillation tower through a reflux condenser, a reflux condenser liquid level tank and an ammonia distillation tower reflux pump in sequence. The utility model has the advantages of simple equipment, low energy consumption, low equipment investment and operation cost, realization of effective ammonia-carbon separation, high operation elasticity and environmental friendliness.
Description
Technical Field
The utility model relates to a chemical wastewater treatment device, in particular to a treatment device for ammonia-containing and carbon-containing chemical wastewater.
Background
In oil refining and coal chemical industry, a large amount of wastewater containing acidic components (such as hydrogen sulfide, CO2 and the like) and ammonia is generated. For wastewater produced in coal chemical industry, the content of CO2 is about 3000-30000 mg/L, the content of ammonia is generally 2500-15000 mg/L, and the content of CO2 and ammonia in the wastewater is unstable and has larger fluctuation. Many of these waste waters are harmful to humans and the environment and can be left in the plant to corrode. In the prior production process, single-tower distillation is carried out, ammonia and CO2 are driven out together to be directly discharged to the atmosphere or sent to a torch for burning, so that environmental pollution and resource waste are caused; some of the waste water is separated by double towers, so that the investment is high, the energy consumption is high, and more than 200 kg of steam is consumed per ton of waste water.
How to realize single-tower wastewater treatment, recycle of ammonia in wastewater can be realized with lower operation cost, and the influence of fluctuation of ammonia and CO2 content in wastewater on operation can be adapted to the key point of the wastewater treatment device.
Disclosure of Invention
The utility model aims to solve the technical problems and provide the ammonia-containing and carbon-containing chemical wastewater treatment device which has the advantages of simple equipment, low energy consumption, low equipment investment and operation cost, high operation flexibility and environmental friendliness, and can realize effective ammonia-carbon separation.
The utility model relates to a treatment device for ammonia-containing and carbon-containing chemical wastewater, which comprises an ammonia distillation tower provided with a tower bottom reboiler, and further comprises a feed pump, wherein an outlet of the feed pump is respectively connected with a first feed port at the tower top of the ammonia distillation tower and a feed preheater tube side or shell side, and the tube side or shell side of the feed preheater is connected with a second feed port at the upper part of the ammonia distillation tower; the middle gas outlet of the ammonia distillation tower is connected with a reflux liquid inlet below the middle gas outlet of the ammonia distillation tower through a reflux condenser, a reflux condenser liquid level tank and an ammonia distillation tower reflux pump in sequence.
The liquid phase outlet at the bottom of the ammonia still is communicated with the boundary region through the shell pass or tube pass of the feeding preheater.
The middle gas outlet of the ammonia distillation tower is correspondingly positioned at a plurality of tower plates in the middle of the ammonia distillation tower, and can be laterally drawn from different tower plates according to the requirement.
And a gas phase outlet at the top of the liquid level groove of the reflux condenser is sequentially connected with an ammonia water product condenser and an ammonia water product subcooler.
The gas phase outlet at the top of the liquid level groove of the reflux condenser can be connected with an ammonia product subcooler through an ammonia product rectifying tower.
And a liquid phase outlet at the bottom of the ammonia product subcooler is connected with an ammonium carbonate liquid inlet above a gas outlet in the middle of the ammonia still through an ammonium carbonate liquid tank and an ammonium carbonate liquid pump.
The beneficial effects are that:
by arranging two feed inlets on the ammonia still, respectively introducing cold materials and hot materials, and exchanging heat with the bottom liquid by utilizing a feed preheater, the steam consumption is reduced; the two feed inlets are higher than the gas outlet of the side stream extraction, the gas extracted from the side stream extraction gas outlet can obtain ammonia water after condensation and gas-liquid separation, and can obtain more than 99.5% of high-purity ammonia gas even after further treatment; the side mining position (the position of the gas outlet) can be conveniently adjusted according to the concentration of ammonia in the raw materials, so that the steam consumption is greatly reduced, and the flexibility and the adaptability are good. The utility model has the advantages of simple structure, low energy consumption (steam consumption per ton of wastewater is less than 150 kg), low investment (ammonia concentration in the wastewater after treatment is lower than 50ppm by a single tower, ammonia-carbon separation is realized, high-concentration ammonia water or pure ammonia gas is prepared), and high operation elasticity (the fluctuation of the ammonia concentration of raw material wastewater in the range of 2500-15000 ppm or more can be adapted).
Drawings
FIG. 1 is a process flow diagram of the present utility model patent.
Wherein, 001-feed pump, 002-alkali adding unit, 003-ammonia still, 3.1-first feed inlet, 3.2-second feed inlet, 3.3-gas phase outlet, 3.4-reflux inlet, 3.5-liquid phase outlet, 3.6-ammonium bicarbonate liquid inlet, 004-reflux condenser, 005-reflux condenser liquid level tank, 006-ammonia water product condenser, 007-ammonia water product subcooler, 008-ammonia product rectifying tower, 009-tower top condenser, 010-ammonia product subcooler, 011-tower bottom reboiler, 012-feed preheater, 013-ammonia still reflux pump, 014-ammonia product rectifying tower reflux pump, 015-ammonium bicarbonate liquid tank, 016-ammonium bicarbonate liquid pump.
Detailed Description
In order that the above-recited objects, features and advantages of the present utility model can be more clearly understood, a further description of the utility model will be rendered by reference to the appended drawings and examples.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced in other ways than as described herein, and therefore the present utility model is not limited to the specific embodiments disclosed below.
Referring to fig. 1, in the treatment device for ammonia-containing and carbon-containing chemical wastewater, an outlet of a feed pump 011 is respectively connected with a first feed port 3.1 at the top of an ammonia distillation tower 003 (provided with a tower bottom reboiler 011) and a tube side or shell side of a feed preheater 012, wherein the tube side or shell side of the feed preheater 012 is connected with a second feed port 3.2 at the upper part of the ammonia distillation tower 3; the middle gas outlet 3.3 of the ammonia distillation tower 003 is connected with a reflux liquid inlet 3.4 below the middle gas outlet 3.3 of the ammonia distillation tower 3 sequentially through a condenser 004, a reflux condenser liquid level tank 005 and an ammonia distillation tower reflux pump 013; according to the requirement, the middle gas outlet 3.3 of the ammonia distillation tower 003 can be correspondingly positioned at a plurality of tower plates in the middle of the ammonia distillation tower, such as 13 th, 19 th or 25 th tower plates, the specific position is determined according to the concentration of ammonia in the raw material, if the concentration of ammonia is higher, the position of the tower plate corresponding to the middle gas outlet 3.3 is lower, otherwise, the position is higher; the liquid phase outlet 3.5 at the bottom of the ammonia still 3 communicates with the interface via the shell side or tube side of the feed preheater 012.
As an embodiment, the gas phase outlet at the top of the reflux condenser liquid level tank 005 is sequentially connected to the ammonia product condenser 006 and the ammonia product subcooler 007.
As another implementation mode, the gas phase outlet at the top of the liquid level tank 005 of the reflux condenser is also connected with the ammonia product subcooler 010 through the ammonia product rectifying tower 008, and the liquid phase outlet at the bottom of the ammonia product subcooler 010 is connected with the ammonium bicarbonate liquid inlet 3.6 above the middle gas outlet 3.3 of the ammonia still 3 through the ammonium bicarbonate liquid tank 015 and the ammonium bicarbonate pump 016.
The technical process comprises the following steps:
in the embodiment, ammonia-containing and carbon-containing wastewater (raw material wastewater for short) of a coal chemical plant is selected, the treatment capacity is 325 tons/hour, the ammonia concentration is 2500-8000 mg/L, the CO2 concentration is 4000-11000 mg/L, and the trace H2S is adopted.
Raw material wastewater is pressurized to 0.3MPaG by a feed pump 001, alkali liquor is added into the wastewater by an alkali adding unit 002 to neutralize strong acid ions, then the waste liquid to be treated is divided into two parts, one part is taken as cold feed and enters an ammonia distillation tower 003 from a first feed port 3.1 at the top of the tower, the temperature of the cold feed is 45 ℃, and the other part is heated to 125 ℃ after heat exchange between a feed preheater 012 and tower bottom liquid, and enters the tower from a second feed port 3.2 at the upper part of the ammonia distillation tower 003.
Then, a gas is pumped from the middle part of the ammonia distillation tower 003 (according to the ammonia content in the raw materials, a gas outlet 3.3 corresponding to the 13 th, 19 th or 25 th tower plates can be used), and is sent to a reflux condenser 004 for condensation, and after gas-liquid separation through a liquid level groove 005 of the reflux condenser, the condensate is used as reflux liquid, and returns to a reflux liquid inlet 3.4 below the gas outlet 3.3 of the ammonia distillation tower 003 through an ammonia distillation tower reflux pump 013, and the gas phase at the top of the reflux condenser 05, namely ammonia with 15% ammonia, can be used as a product to be condensed through an ammonia water product condenser 006, cooled through an ammonia water product subcooler 007 and then sent to an ammonia water storage unit for storage.
In another scheme, the gas phase at the top of the reflux condenser 05 can be further concentrated by an ammonia product rectifying tower 008 with only a rectifying section to obtain high-purity gas ammonia with the concentration of more than 98%, then the high-purity gas ammonia is condensed by an ammonia product subcooler 010 to remove water and residual CO2 gas, and the high-purity gas ammonia with the concentration of more than 99.5% is processed in the next working section to prepare pure ammonia by pressure rectification or is directly used; the ammonium bicarbonate liquid generated by condensation of the ammonia product subcooler 010 is collected by an ammonium bicarbonate liquid tank 015 and then is circulated back to the ammonium bicarbonate liquid inlet 3.6 at the upper part of the ammonia still 003 by an ammonium bicarbonate liquid pump 016 to be fed into the ammonia still. The tail gas at the top of the ammonia still 003 is mixed gas of CO2 containing less than 1% of ammonia and water, and the mixed gas is sent to a carbon residue furnace for burning.
The process can realize single tower separation of ammonia and CO2 and produce high purity ammonia with operation pressure of 0.2MPag. The total nitrogen content of the wastewater (bottom liquid) discharged from the bottom of the ammonia still 003 after treatment is lower than 50ppm, which meets the discharge requirement.
The device can treat ammonia-containing wastewater with different concentrations and can prepare qualified ammonia water products or high-concentration ammonia gas. The energy consumption of waste water per ton is only 145 kg of steam and 1.1℃ electricity, and the benefit is good.
Claims (6)
1. The device for treating the ammonia-containing and carbon-containing chemical wastewater comprises an ammonia distillation tower provided with a tower bottom reboiler, and is characterized by further comprising a feed pump, wherein an outlet of the feed pump is respectively connected with a first feed port at the top of the ammonia distillation tower and a feed preheater tube pass or shell pass through a pipeline, and the tube pass or shell pass of the feed preheater is connected with a second feed port at the upper part of the ammonia distillation tower; the middle gas outlet of the ammonia distillation tower is connected with a reflux liquid inlet below the middle gas outlet of the ammonia distillation tower through a reflux condenser, a reflux condenser liquid level tank and an ammonia distillation tower reflux pump in sequence.
2. The apparatus for treating ammonia-containing chemical wastewater as recited in claim 1, wherein the gas outlet in the middle of the ammonia still is located at a plurality of trays in the middle of the ammonia still.
3. The apparatus for treating ammonia-containing chemical wastewater as claimed in claim 1, wherein the liquid phase outlet at the bottom of the ammonia still tower is in communication with the boundary zone via a shell side or tube side of the feed preheater.
4. A treatment device for ammonia-containing chemical wastewater as claimed in any one of claims 1 to 3, wherein a gas phase outlet at the top of the reflux condenser liquid level tank is connected with an ammonia water product condenser and an ammonia water product subcooler in sequence.
5. A treatment plant for ammonia-containing chemical wastewater as claimed in any one of claims 1 to 3, wherein the gas phase outlet at the top of the reflux condenser liquid level tank is further connectable to an ammonia product subcooler via an ammonia product rectifying column.
6. The apparatus for treating ammonia-containing chemical wastewater according to claim 5, wherein the bottom liquid phase outlet of the ammonia product subcooler is connected with the ammonium carbonate liquid inlet above the middle gas outlet of the ammonia still through the ammonium carbonate liquid tank and the ammonium carbonate liquid pump.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223505437.XU CN219079146U (en) | 2022-12-22 | 2022-12-22 | Treatment device for ammonia-containing and carbon-containing chemical wastewater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223505437.XU CN219079146U (en) | 2022-12-22 | 2022-12-22 | Treatment device for ammonia-containing and carbon-containing chemical wastewater |
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| CN219079146U true CN219079146U (en) | 2023-05-26 |
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