CN209797680U - Wastewater treatment device containing acidic gas and alkaline gas - Google Patents
Wastewater treatment device containing acidic gas and alkaline gas Download PDFInfo
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- CN209797680U CN209797680U CN201920521060.6U CN201920521060U CN209797680U CN 209797680 U CN209797680 U CN 209797680U CN 201920521060 U CN201920521060 U CN 201920521060U CN 209797680 U CN209797680 U CN 209797680U
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Abstract
The utility model relates to a waste water treatment device who contains acid gas and alkaline gas, the device includes acid gas strip tower and alkaline gas strip tower, the middle part of acid gas strip tower is through first pipe-line mixer and heat exchanger intercommunication, acid gas strip tower top export is through first condenser and first backwash groove intercommunication, first backwash groove bottom is through first backwash pump and acid gas strip tower top entry intercommunication, acid gas strip tower bottom is through the waste water pump, second pipe-line mixer and alkaline gas strip tower middle part intercommunication, the top export of alkaline gas strip tower is through second condenser and second backwash tank intercommunication, the bottom of second backwash tank is through the top entry intercommunication of second backwash pump and alkaline gas strip tower, the second backwash tank is through draught fan and scrubbing tower intercommunication, alkaline gas strip tower intercommunication heat exchanger. The utility model provides a waste water treatment device adopts the strip of two towers, and acid, alkaline gas strip from the strip tower of difference respectively, avoid equipment corrosion.
Description
Technical Field
The utility model relates to the technical field of wastewater treatment, in particular to a wastewater treatment device containing acidic gas and alkaline gas.
Background
The wastewater containing both acidic gas and alkaline gas is commonly used in the production process of chemical products such as synthetic ammonia, methanol, coal and the like, and is not strictly required by national and local environmental protection policies in the years, and is usually treated by a simple stripping process, namely, single-tower low-pressure steam stripping, direct discharge of tower top stripping gas or concentrated discharge of the stripping gas delivered to an exhaust funnel, so that secondary pollution is caused.
for enterprises producing chemical products such as synthetic ammonia, methanol, oil products and the like by taking coal as a raw material, the conversion condensate is typical and contains acid gas (such as CO2, H2S and Cl)-、CN-Etc.) and an alkaline gas (e.g., NH3), wherein the contents of CO2 and NH3 are 0.14% and 0.13% (wt%), respectively.
At present, the conversion condensate treatment process of a domestic large-scale coal chemical device mainly comprises single-tower steam stripping, single-tower side line deamination, double-tower steam stripping and the like, but due to unreasonable design in the aspects of operation parameters, specific flow setting and the like, equipment and pipelines are seriously blocked and corroded, and the long-period stable operation of the device is influenced.
SUMMERY OF THE UTILITY MODEL
In order to overcome the above-mentioned not enough of prior art, the utility model provides a waste water treatment device who contains acid gas and alkaline gas adopts two tower strips to part acid gas and alkaline gas, does not have the ammonium salt to generate, avoids equipment corrosion and pipe blockage, guarantees the steady operation of device.
The utility model discloses a realize through following technical scheme:
The utility model provides a waste water treatment device who contains acid gas and alkaline gas, includes acid gas stripper and alkaline gas stripper, the middle part of acid gas stripper is through first pipeline mixer and heat exchanger intercommunication, the top export of acid gas stripper is through first condenser and first backwash groove intercommunication, the bottom export of first backwash groove is through the top entry intercommunication of first backwash pump with acid gas stripper, the bottom of acid gas stripper is through waste water pump, the middle part intercommunication of second pipeline mixer and alkaline gas stripper in proper order, the top export of alkaline gas stripper is through second condenser and second backwash groove intercommunication, the bottom export of second backwash groove is through the top entry intercommunication of second backwash pump with alkaline gas stripper, second backwash groove is through draught fan and scrubbing tower intercommunication, the bottom of scrubbing tower is through the water inlet of pipeline intercommunication waste water pump, the bottom of the alkaline gas stripping tower is communicated with a heat exchanger through a pipeline.
Further, the acid gas stripping tower adopts empty tower spraying or a combination of an anti-blocking tower tray and a filler.
Further, the alkaline gas stripping tower adopts a combination of an anti-blocking tower tray and a filler.
Further, the operating pressure of the top of the acid gas stripping tower is 0.2MPaA, and the operating pressure of the alkaline gas stripping tower is 0.12-0.20 MPaA.
A method for treating wastewater containing acid gas and alkaline gas specifically comprises the following steps:
s1: heating production wastewater A (40 ℃) containing acid gas and alkaline gas to 90-100 ℃ through heat exchange of a heat exchanger, adding the weak acid wastewater E into a wastewater pipeline, fully mixing the weak acid wastewater E through a first pipeline mixer, adjusting the pH to 5-6, feeding stripping gas C into a tower from the middle part of an acid gas stripping tower, feeding gas C into the tower from the lower part of the acid gas stripping tower, cooling the gas discharged from the top of the acid gas stripping tower to 80 ℃ through a first condenser, feeding the gas into a first reflux groove, refluxing liquid discharged from the bottom of the first reflux groove to the top of the acid gas stripping tower through a first reflux pump, and discharging acid gas H to a torch from an outlet at the upper part of the first reflux groove;
S2: after passing through a wastewater pump, a pH adjusting device (pH is 8-9) and a second pipeline mixer, the wastewater (about 130 ℃) from which the acid gas is removed at the bottom of the acid gas stripping tower and alkaline wastewater B enter the tower from the middle part of the alkaline gas stripping tower, stripping gas C enters the tower from the lower part of the alkaline gas stripping tower, gas at the outlet of the top of the alkaline gas stripping tower enters a second reflux tank after being condensed by a second condenser, part of ammonia water discharged from the bottom of the second reflux tank is refluxed to the top of the alkaline gas stripping tower as reflux liquid, and part of ammonia water is sold or recycled G as ammonia water; the non-condensable gas at the outlet of the upper part of the second reflux tank is sent to a washing tower through a draught fan, industrial water D is added into the washing tower and is discharged from the top of the washing tower after being washed, and liquid discharged from the bottom of the washing tower flows to the inlet of a waste water pump; and the waste water at the bottom outlet of the alkaline gas stripping tower flows to a heat exchanger, and the waste water F subjected to temperature reduction treatment by the heat exchanger is sent to a biochemical device.
Further, the stripping gas entering from the lower portion of the acid gas stripper and the stripping gas entering from the lower portion of the basic gas stripper in steps S1 and S2 are low pressure steam.
Further, the weakly acidic wastewater in step S1 is a 5% diluted HCl solution, and the alkaline wastewater in step S2 is a 30% NaOH solution.
Further, in the step S2, NH3-N of wastewater at the outlet of the bottom of the alkaline gas stripping tower is less than 15 mg/L.
Further, the operating pressure of the top of the acid gas stripping tower is 0.2MPaA, and the operating pressure of the alkaline gas stripping tower is 0.12-0.20 MPaA.
Furthermore, the acid gas stripping tower adopts empty tower spraying or the combination of an anti-blocking tower tray and a filler, and the alkaline gas stripping tower adopts the combination of the anti-blocking tower tray and the filler.
Compared with the prior art, the beneficial effects of the utility model reside in that:
The utility model discloses a waste water treatment device has adopted unique two-tower strip, and acid gas and alkaline gas strip out from acid gas strip tower and alkaline gas strip tower respectively, and structural design is reasonable, and waste water is through handling the back acid gas and send the torch, and the ammonia nitrogen is retrieved with the form of aqueous ammonia and is sold or be used as the raw materials of production process outward, the fine solution not only equipment corrosion and the problem of pipe blockage, the steady operation of assurance device, certain economic benefits has been produced moreover.
drawings
FIG. 1 is a schematic structural diagram of a wastewater treatment apparatus containing acidic gas and alkaline gas according to the present invention.
In the figure:
1. A heat exchanger; 2. a first line mixer; 3. an acid gas stripper; 4. a first condenser; 5. a first backflow groove; 6. a first reflux pump; 7. a waste water pump; 8. a second line mixer; 9. an alkaline gas stripper; 10. a second condenser; 11. a second reflux tank; 12. a second reflux pump; 13. an induced draft fan; 14. a washing tower; A. production wastewater containing acidic gases and alkaline gases; B. alkaline waste water; C. low-pressure steam; D. industrial water; E. weakly acidic wastewater; F. cooling the treated wastewater; G. selling or recycling ammonia water; H. acid gas.
Detailed Description
The following examples are presented to illustrate certain embodiments of the invention and should not be construed as limiting the scope of the invention. The present disclosure may be modified from materials, methods, and reaction conditions at the same time, and all such modifications are intended to be within the spirit and scope of the present disclosure.
The wastewater treatment device containing acid gas and alkaline gas as shown in fig. 1 comprises an acid gas stripping tower 3 and an alkaline gas stripping tower 9, wherein the middle part of the acid gas stripping tower 3 is communicated with a heat exchanger 1 through a first pipeline mixer 2, the top outlet of the acid gas stripping tower 3 is communicated with a first reflux groove 5 through a first condenser 4, the bottom outlet of the first reflux groove 5 is communicated with the top inlet of the acid gas stripping tower 3 through a first reflux pump 6, the bottom of the acid gas stripping tower 3 is communicated with the middle part of the alkaline gas stripping tower 9 through a wastewater pump 7 and a second pipeline mixer 8 in sequence, the top outlet of the alkaline gas stripping tower 9 is communicated with a second reflux groove 11 through a second condenser 10, the bottom outlet of the second reflux groove 11 is communicated with the top inlet of the alkaline gas stripping tower 9 through a second reflux pump 12, the second reflux tank 11 is communicated with a washing tower 14 through an induced draft fan 13, the bottom of the washing tower 14 is communicated with a water inlet of the waste water pump 7 through a pipeline, and the bottom of the alkaline gas stripping tower 9 is communicated with the heat exchanger 1 through a pipeline.
In this embodiment, the acid gas stripping tower 3 adopts an empty tower spray or a combination of an anti-clogging tray and a filler, the alkaline gas stripping tower 9 adopts a combination of an anti-clogging tray and a filler, the stripping section is a filler, and the rectifying section is an anti-clogging tray.
a method for treating wastewater containing acid gas and alkaline gas specifically comprises the following steps:
S1: the method comprises the following steps that (1) production wastewater A40 ℃ containing acid gas and alkaline gas is subjected to heat exchange through a heat exchanger 1 to be heated to 90-100 ℃, weakly acidic wastewater E is added into a wastewater pipeline, is fully mixed through a first pipeline mixer 2, then the pH value is adjusted to 5-6, the wastewater enters a tower from the middle part of an acid gas stripping tower 3, stripping gas C enters the tower from the lower part of the acid gas stripping tower 3, gas discharged from the top of the acid gas stripping tower 3 is cooled to 80 ℃ through a first condenser 4 and enters a first reflux groove 5, liquid discharged from the bottom of the first reflux groove 5 is refluxed to the top of the acid gas stripping tower 3 through a first reflux pump 6, the tower top operating pressure of the acid gas stripping tower 3 is 0.2MPaA, and the acid gas H can be conveniently and smoothly discharged to a;
S2: the method comprises the following steps of removing acid gas-containing wastewater from the bottom of an acid gas stripping tower 3 at about 130 ℃ and alkaline wastewater B, adjusting the pH to 8-9 by a wastewater pump 7 and a second pipeline mixer 8, feeding stripping gas C into the alkaline gas stripping tower 9 from the middle part of the alkaline gas stripping tower 9, feeding stripping gas C into the alkaline gas stripping tower 9 from the lower part of the alkaline gas stripping tower 9, wherein the operating pressure of the alkaline gas stripping tower 9 is 0.12-0.20 MPaA, condensing outlet gas at the top of the alkaline gas stripping tower 9 by a second condenser 10, feeding the condensed outlet gas into a second reflux tank 11, feeding part of ammonia water discharged from the bottom of the second reflux tank 11 as reflux liquid to the top of the alkaline gas stripping tower 9, and selling or recycling part of ammonia; the non-condensable gas at the upper outlet of the second reflux tank 11 is sent to a washing tower 14 through an induced draft fan 13, the industrial water D is added into the washing tower 14 and is discharged from the top of the washing tower 14 after being washed, and the liquid from the bottom of the washing tower 14 flows to the inlet of a waste water pump 7; and the wastewater (NH3-N is less than 15mg/L) at the bottom outlet of the alkaline gas stripping tower 9 flows to the heat exchanger 1, and the wastewater F after the temperature reduction treatment of the heat exchanger 1 is sent to a biochemical device.
In this embodiment, the stripping gas C entering from the lower part of the acid gas stripper 3 and the stripping gas C entering from the lower part of the alkaline gas stripper 9 in steps S1 and S2 are low-pressure steam to ensure that the acid gas and the alkaline gas are stripped from different top of the tower respectively.
In this embodiment, the weakly acidic wastewater E in step S1 is a 5% dilute HCl solution, and the weakly acidic wastewater E enters the acidic gas stripping tower 3 to ensure that the alkaline gas is not stripped or is stripped very little; in the step S2, the alkaline wastewater B is a 30% NaOH solution, and the alkaline wastewater E enters the alkaline gas stripping tower 9, so that the free ammonia component in the wastewater can be increased, and the stripping efficiency can be enhanced.
In this embodiment, the acid gas stripping tower 3 adopts an empty tower spray or a combination of an anti-clogging tray and a filler, the alkaline gas stripping tower 9 adopts a combination of an anti-clogging tray and a filler, the stripping section is a filler, and the rectifying section is an anti-clogging tray.
In conclusion, the wastewater treatment device adopts double-tower stripping, has a simple structure, and acidic gas and alkaline gas are respectively stripped from the acidic stripping tower and the alkaline gas stripping tower, so that ammonium salt is prevented from being generated in the wastewater treatment process, the problems of tower top equipment and pipeline blockage and corrosion are further solved, the acidic gas treated by the device is sent to a torch, ammonia nitrogen in the wastewater is recovered in the form of ammonia water and is sold or used as a raw material in the production process, and a certain economic value is generated.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (4)
1. The wastewater treatment device containing the acid gas and the alkaline gas is characterized by comprising an acid gas stripping tower (3) and an alkaline gas stripping tower (9), wherein the middle part of the acid gas stripping tower (3) is communicated with a heat exchanger (1) through a first pipeline mixer (2), the top outlet of the acid gas stripping tower (3) is communicated with a first reflux groove (5) through a first condenser (4), the bottom outlet of the first reflux groove (5) is communicated with the top inlet of the acid gas stripping tower (3) through a first reflux pump (6), the bottom of the acid gas stripping tower (3) is communicated with the middle part of the alkaline gas stripping tower (9) through a wastewater pump (7) and a second pipeline mixer (8) in sequence, the top outlet of the alkaline gas stripping tower (9) is communicated with a second reflux groove (11) through a second condenser (10), the bottom export of second backwash tank (11) is through the top entry intercommunication of second backwash pump (12) and alkaline gas stripper (9), second backwash tank (11) are through draught fan (13) and scrubbing tower (14) intercommunication, the water inlet of pipeline intercommunication waste water pump (7) is passed through to the bottom of scrubbing tower (14), the bottom of alkaline gas stripper (9) is through pipeline and heat exchanger (1) intercommunication.
2. the wastewater treatment plant according to claim 1, wherein the acid gas stripping column (3) employs a combination of empty tower spray or anti-clogging trays and packing.
3. The wastewater treatment plant according to claim 1, wherein said alkaline gas stripper (9) employs a combination of anti-clogging trays and packing.
4. The wastewater treatment plant according to claim 1, wherein the acid gas stripper (3) has an overhead operating pressure of 0.2MPaA and the alkaline gas stripper (9) has an operating pressure of 0.12-0.20 MPaA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920521060.6U CN209797680U (en) | 2019-04-17 | 2019-04-17 | Wastewater treatment device containing acidic gas and alkaline gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920521060.6U CN209797680U (en) | 2019-04-17 | 2019-04-17 | Wastewater treatment device containing acidic gas and alkaline gas |
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| CN209797680U true CN209797680U (en) | 2019-12-17 |
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| CN201920521060.6U Active CN209797680U (en) | 2019-04-17 | 2019-04-17 | Wastewater treatment device containing acidic gas and alkaline gas |
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