CN204342463U - A kind of device producing weak ammonia containing ammonia conversion lime set waste water - Google Patents

A kind of device producing weak ammonia containing ammonia conversion lime set waste water Download PDF

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Publication number
CN204342463U
CN204342463U CN201420778244.8U CN201420778244U CN204342463U CN 204342463 U CN204342463 U CN 204342463U CN 201420778244 U CN201420778244 U CN 201420778244U CN 204342463 U CN204342463 U CN 204342463U
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China
Prior art keywords
ammonia
pipes
outlet
line
tower
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CN201420778244.8U
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Chinese (zh)
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杨震东
章华勇
宗丽
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SHANGHAI INTERNATIONAL CONSTRUCTION ENGINEERING CONSULTING CO LTD
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SHANGHAI INTERNATIONAL CONSTRUCTION ENGINEERING CONSULTING CO LTD
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Abstract

A kind of device producing weak ammonia containing ammonia conversion lime set waste water disclosed in the utility model, it, on single tower pressurization steam stripped basis of lateral line withdrawal function, increases ammonia absorption tower, adopts the mode of cooling and absorbing to produce qualified weak ammonia.Not only can save facility investment, and effectively can avoid above-mentioned corrosion-prone operation warm area.The invention also discloses a kind of device producing weak ammonia containing ammonia conversion lime set waste water.

Description

A kind of device producing weak ammonia containing ammonia conversion lime set waste water
Technical field
The utility model relates to containing ammonia conversion lime set technical field of waste water processing, in particular to a kind of device producing weak ammonia containing ammonia conversion lime set waste water, it is by reconfiguring containing ammonia conversion lime set wastewater treatment process, solves cannot to process containing ammonia conversion lime set waste water at present or ammoniacal liquor quality after treatment cannot meet the problem of relevant criterion.
Background technology
In view of China is the country that a many gas of coal is few, at present, most of chemical enterprise all adopts coal to be raw material.In view of conversion section is the requisite workshop section of each coal chemical engineering equipment.Owing to containing a small amount of ammonia in the gas after gasification, after heat exchange cooling, produce a large amount of ammonia-containing waters at the high-temperature gas of conversion section.Especially it is a lot of that the ammonia content in the conversion lime set waste water produced in coal-water slurry gasification will exceed fine coal gasification process.
In the coal plant run at present, single tower steam air lift, double tower stripping and single tower pressurization side line is mainly contained to the process containing ammonia conversion lime set waste water and take out the steam stripped mode of ammonia.
Single tower steam air lift main flow is described below: see Fig. 1, conversion stripping tower top delivered to by phlegmas all in conversion section after heating, passes into a certain amount of low-pressure steam at the bottom of tower.Light constituent in conversion lime set is separated under the effect of steam air lift from conversion lime set, discharge from stripper top, be separated after condensation, gas enters torch or sulfur recovery unit, then returns to stripping tower top or do not reflux as wastewater disposition containing ammonia condensing liquid.
This flow process exists following not enough:
Contain from the H in coal from general in the conversion lime set of conversion section 2s, CO 2, ammonia, Cl -, CN -etc. component.These components are directly delivered in conversion stripping tower if do not processed, will produce corrosion to conversion stripping tower, column internals and auxiliary facility thereof.All there is problems in current numerous coal plant.
As adopted above-mentioned single tower steam gas stripping process process conversion lime set, if not refluxing containing ammonia condensing liquid of dephlegmator of top of the tower, then stripping sewage is had to need outer row.If phlegma returns in stripping tower and participates in washing, carbonic acid gas, hydrogen sulfide and ammonia then can be accumulated in reflux process, cause the Corrosion blockage of equipment, pipeline.
As adopted above-mentioned single tower steam gas stripping process process conversion lime set, the gas mixture of what stripper overhead was discharged is carbonic acid gas, hydrogen sulfide and ammonia, in follow-up condensation process, vapor delivery line very easily generates NH because of carbonic acid gas, hydrogen sulfide and ammonia when lowering the temperature 4hS and NH 4hCO 3ammonium salt crystallization, causes corrosion and the line clogging of stripper overhead column plate, overhead condenser.
As adopted above-mentioned single tower steam gas stripping process process conversion lime set, ammonia carries out burning disposal as objectionable impurities, not only wastes resource, also result in environmental pollution.
Double tower stripping main flow is described below: see Fig. 2: conversion lime set enters urea carbon dioxide stripper top after heating, passes into the secondary steam of aminoacid stripping tower top output at the bottom of tower.Carbonic acid gas and hydrogen sulfide are discharged from urea carbon dioxide stripper top, be separated after condensation, the not solidifying sour gas in top enters torch or sulfur recovery workshop section, bottom urea carbon dioxide stripper, lime set waste water enters aminoacid stripping tower top, tower reactor passes into a certain amount of low-pressure steam, ammonia steam is discharged from tower top, through time condensation, obtains rich ammonia and condensation sewage.Wherein one-level phlegma returns in aminoacid stripping tower, and B-grade condensation liquid is as wastewater disposition, and rich ammonia enters torch or sulfur recovery workshop section.This flow process overcomes the segmental defect in single tower steam air lift, but still assigns ammonia as detoxication, does not reclaim, and has sewage to need outer row in flow process.
Single tower pressurization lateral line withdrawal function stripping main flow is described below: see Fig. 3, conversion lime set divides hot and cold two stocks not enter stripping tower from top and middle and upper part, the CO that stripping goes out 2, H 2the sour gas such as S and Ammonia, water vapour, directly send into torch or sulfur recovery unit.Ammonia in conversion lime set, in the middle part enrichment of tower, after being come after three grades of condensations and separatory, obtains the thick ammonia of higher concentration, delivers to ammonia refining part and process further by side extraction.Head tank is returned after three fraction lime set mixing.
This flow scheme improvements double tower stripping process, but also exist following not enough:
(1) ammonia steam is through three grades of condensations, can obtain the rich ammonia that concentration is about 99%, wherein CO 2content is about 20ppm, H 2s content is about 1000ppm, but still can not directly be used for preparing H 2the content of S is less than 100ppm, and concentration is the qualified weak ammonia of 20%.
(2) second stage condensing temperature in usual three grades of condenser systems controls at 70-90 DEG C, thus further a certain amount of water of condensation and hydrogen sulfide improve the concentration of ammonia in gas phase.But the corrosion of hydrogen sulfide to steel strengthens with the rising of temperature, reach the highest 80 DEG C of erosion rates, after temperature raises again, erosion rate starts to reduce, and when 110-120 DEG C, erosion rate reaches minimum.
(3) three grades of condensation flow processs include three interchanger and three points of flow containers, take up an area large.
Utility model content
Technical problem to be solved in the utility model is for not up to standard containing the process of ammonia conversion lime set in routine variations flow process, useless ammonia can only go fired downstream discharge a difficult problem for oxynitride and provide a kind of device producing weak ammonia containing ammonia conversion lime set waste water, it, on single tower pressurization steam stripped basis of lateral line withdrawal function, adopts the mode of cooling and absorbing to produce qualified weak ammonia.
Technical problem to be solved in the utility model can be achieved through the following technical solutions:
A kind of device producing weak ammonia containing ammonia conversion lime set waste water, comprise stripping tower and ammonia absorption tower, described ammonia absorption tower inside is formed by three sections that are communicated with successively, wherein the Ith section is positioned at the bottom of described ammonia absorption tower, the IIth section of middle part being positioned at described ammonia absorption tower, the IIIth section of top being positioned at described ammonia absorption tower, with changing device convert that condensate outlet is connected containing ammonia first contain ammonia and convert the other end of lime set line of pipes and first of described stripping tower top and contain ammonia and convert lime set entrance and be connected, with changing device convert that condensate outlet is connected containing ammonia second contain ammonia and convert the first entrance that the lime set line of pipes the other end connects First Heat Exchanger, first outlet of First Heat Exchanger is connected to the first entrance of the second interchanger containing ammonia conversion lime set line of pipes by the 3rd, first outlet of the second interchanger is connected to second of described stripping tower middle and upper part containing ammonia conversion lime set entrance by the 4th containing ammonia conversion lime set line of pipes, at the bottom of described stripping tower tower, reboiler is installed, qualified purification and condensation liquid outlet is provided with at the bottom of described stripping tower tower, the outlet of described qualified purification and condensation liquid is connected to the entrance of the first force (forcing) pump through the first qualified purification and condensation liquid line of pipes, first pressurization pump outlet is connected to the second entrance of the second interchanger by the second qualified purification and condensation liquid line of pipes, second outlet of the second interchanger is connected to the entrance of watercooler by the 3rd qualified purification and condensation liquid line of pipes, the outlet of watercooler picks out battery limit (BL) by the 4th qualified purification and condensation liquid line of pipes, be provided with containing most of H at described stripper overhead 2s, CO 2light constituent distillate mouth, described containing most of H 2s, CO 2the mouth that distillates of light constituent be connected with sour gas export pipeline, be provided with containing part H in described stripping tower middle and lower part 2s, NH 3, H 2the side outlet of the light constituent of O, described containing part H 2s, NH 3, H 2the side outlet of the light constituent of O contains part H by first 2s, NH 3, H 2the light constituent line of pipes of O is connected to the second entrance of described First Heat Exchanger, and the second outlet of described First Heat Exchanger contains part H by second 2s, NH 3, H 2the light constituent line of pipes of O is connected to the bottom of described ammonia absorption tower I section, enters into ammonia absorption tower I section top from the liquid phase bottom ammonia absorption tower II section by action of gravity, and cooling and absorbing is from rising part H bottom ammonia absorption tower I section 2s, gas phase through cooling and absorbing enters into bottom ammonia absorption tower II section by chimney plate, described 4th qualified purification and condensation liquid line of pipes is connected with the 5th, the purification and condensation liquid line of pipes of six directions lattice, the purification and condensation liquid line of pipes of described pentahapto lattice is connected to described ammonia absorption tower II section top, the purification and condensation liquid line of pipes of described pentahapto lattice is connected to described ammonia absorption tower the IIIth section of top, the outlet of qualified weak ammonia is provided with in described ammonia absorption tower the IIIth section of bottom, described qualified weak ammonia outlet is connected to the entrance of aqua ammonia pump by the first qualified weak ammonia line of pipes, described ammoniacal liquor pump outlet is connected to the entrance of ammoniacal liquor water cooler by the second qualified weak ammonia line of pipes, and the outlet of ammoniacal liquor water cooler picks out battery limit (BL) by the 3rd qualified weak ammonia line of pipes, described 3rd qualified weak ammonia line of pipes is also connected to the 4th qualified weak ammonia line of pipes, and the other end of the 4th qualified weak ammonia line of pipes is connected to the refrigerant circulation mouth at described ammonia absorption tower III section top, condensate outlet is provided with at the bottom of described ammonia absorption tower tower, described condensate outlet is connected to the entrance of the second force (forcing) pump by the first phlegma line of pipes, and the second pressurization pump outlet is connected to the condensate inlet of stripping tower middle and lower part by the second phlegma line of pipes, described ammonia absorption top of tower is provided with offgas outlet, and described offgas outlet sends battery limit (BL) by the first tail gas output tube.
In a preferred embodiment of the present utility model, described tail gas output tube is also connected with a N2 and supplements pipe.
Owing to have employed as above technical scheme, the utility model compared with prior art, has following technical characteristic:
1. ammonia absorption tower is set and replaces three grades of traditional condensation flow processs, cooling, Absorption Desulfurization and ammoniacal liquor are produced and is integrated, reduce facility investment and occupation of land.
2. the Partial Transformation lime set after adopting process qualified delivers to above-mentioned ammonia absorption tower II section top as cooling and absorption agent, not only effectively reduces the H in gas phase 2s content, can also reduce the temperature of gas phase; Partial Transformation lime set after adopting process qualified delivers to above-mentioned ammonia absorption tower III section top as cooling and absorption agent.Compare the use that traditional ammonia absorption saves de-salted water;
3. due to NH 3after stripping tower is by lateral line withdrawal function, substantially not containing ammonia in tower top sour gas, avoid ammonium salt in the crystallization of stripper overhead and corrosion.Tower top sour gas directly can be delivered to downstream Crouse and reclaim sulphur for this reason;
4. owing to substantially also not containing H in purification and condensation liquid 2s, NH 3deng material, gasification directly can be delivered to or biochemical treatment alleviates the burden of wastewater disposition.
The utility model, at present a kind of by reconfiguring containing ammonia conversion lime set wastewater treatment process, solves cannot to process containing ammonia conversion lime set waste water at present or ammoniacal liquor quality after treatment cannot meet the problem of relevant criterion.
Accompanying drawing explanation
Fig. 1 is existing single tower steam air lift main flow schematic diagram.
Fig. 2 is existing double tower stripping main flow schematic diagram.
Fig. 3 is existing single tower pressurization lateral line withdrawal function stripping main flow schematic diagram.
Fig. 4 is the device schematic diagram that the utility model contains that ammonia conversion lime set waste water produces weak ammonia.
Embodiment
See Fig. 4, the device producing weak ammonia containing ammonia conversion lime set waste water provided in figure, comprise stripping tower T1 and ammonia absorption tower T2, ammonia absorption tower T2 inside is formed by three sections that are communicated with successively, wherein the Ith section is positioned at the bottom of ammonia absorption tower T2, the IIth section of middle part being positioned at ammonia absorption tower T2, the IIIth section of top being positioned at ammonia absorption tower T2.
Convert lime set entrance 3 be connected with the ammonia that contains containing the ammonia the other end that ammonia converts lime set line of pipes 2 containing of convert that condensate outlet 1 is connected and stripping tower T1 top of changing device, with the entrance 5 connecting interchanger E1 containing the ammonia the other end that ammonia converts lime set line of pipes 4 containing of convert that condensate outlet 1 is connected of changing device, the outlet 6 of interchanger E1 converts by containing ammonia the entrance 8 that lime set line of pipes 7 is connected to interchanger E2, and the outlet 9 of interchanger E2 converts lime set entrance 11 by the ammonia that contains being connected to stripping tower T1 middle and upper part containing ammonia conversion lime set line of pipes 10.
At the bottom of stripping tower T1 tower, reboiler E3 is installed.
Qualified purification and condensation liquid outlet 12 is provided with at the bottom of stripping tower T1 tower, qualified purification and condensation liquid outlet 12 is connected to the entrance of force (forcing) pump P1 through qualified purification and condensation liquid line of pipes 13, the outlet of force (forcing) pump P1 is connected to the entrance 15 of interchanger E2 by qualified purification and condensation liquid line of pipes 14, the outlet 16 of interchanger E2 is connected to the entrance 18 of watercooler E4 by qualified purification and condensation liquid line of pipes 17, the outlet 19 of watercooler E4 picks out battery limit (BL) by qualified purification and condensation liquid line of pipes 20.
Be provided with containing most of H at stripping tower T1 tower top 2s, CO 2light constituent distillate mouth 21, containing most of H 2s, CO 2the mouth 21 that distillates of light constituent be connected with sour gas export pipeline 22.
Be provided with containing part H in stripping tower T1 middle and lower part 2s, NH 3, H 2the side outlet 23 of the light constituent of O, containing part H 2s, NH 3, H 2the side outlet 23 of the light constituent of O is by containing part H 2s, NH 3, H 2the light constituent line of pipes 24 of O is connected to the entrance 25 of interchanger E1, and the outlet 26 of interchanger E1 is by containing part H 2s, NH 3, H 2the light constituent line of pipes 27 of O is connected to the bottom of ammonia absorption tower T2 I section, enter into ammonia absorption tower T2 I section top from the liquid phase bottom ammonia absorption tower T2 II section by action of gravity, cooling and absorbing is from rising part H bottom ammonia absorption tower T2 I section 2s; Gas phase through cooling and absorbing enters into bottom ammonia absorption tower T2 II section by chimney plate; Qualified purification and condensation liquid line of pipes 20 is connected with qualified purification and condensation liquid line of pipes 28,29, and qualified purification and condensation liquid line of pipes 29 is connected to ammonia absorption tower T2 II section top; Purification and condensation liquid line of pipes 28 is connected to ammonia absorption tower T2 the IIIth section of top.
Qualified weak ammonia outlet 30 is provided with in ammonia absorption tower T2 the IIIth section of bottom, qualified weak ammonia outlet 30 is connected to the entrance of aqua ammonia pump P3 by qualified weak ammonia line of pipes 31, the outlet of aqua ammonia pump P3 is connected to the entrance of ammoniacal liquor water cooler E5 by qualified weak ammonia line of pipes 32, the outlet of ammoniacal liquor water cooler E5 picks out battery limit (BL) by qualified weak ammonia line of pipes 33.
Qualified weak ammonia line of pipes 33 is also connected to qualified weak ammonia line of pipes 34, and the other end of qualified weak ammonia line of pipes 34 is connected to the refrigerant circulation mouth 35 at ammonia absorption tower T2 III section top.
Be provided with condensate outlet 36 at the bottom of ammonia absorption tower T2 tower, condensate outlet 36 is connected to the entrance of force (forcing) pump P2 by phlegma line of pipes 37, and the outlet of force (forcing) pump P2 is connected to the condensate inlet 39 of stripping tower T1 middle and lower part by phlegma line of pipes 38; Ammonia absorption tower T2 top is provided with offgas outlet 40, and offgas outlet 40 sends battery limit (BL) by a tail gas output tube 41.Tail gas output tube 41 is also connected with a N2 and supplements pipe 42.
The workflow of said apparatus is as follows: the ammonia conversion lime set that contains from changing device is divided into two portions, and a part enters stripping tower T1 middle and upper part after interchanger E1, E2 heat exchange heats up.Stripping tower T1 tower bottom reboiler E3 passes into a certain amount of low pressure steam, carries out stripping to the conversion lime set entering tower.Be that qualified purification and condensation liquid delivers to downstream unit after interchanger E4 cools at the bottom of stripping tower T1 tower.
Component such as major part H2S, CO2 etc. distillates from stripping tower T1 tower top, and the component such as part H2S, NH3, H2O from lateral line withdrawal function, and then enters interchanger E1 and is cooled to 100-120 DEG C and enters into bottom ammonia absorption tower T1 I section.
Ammonia absorption tower T2 I section top is entered into by action of gravity from the liquid phase bottom ammonia absorption tower T1 II section.Cooling and absorbing is from rising part H2S bottom ammonia absorption tower T2 I section.Gas phase through cooling and absorbing enters into bottom ammonia absorption tower T2 II section by chimney plate, delivers to rising part H2S bottom the cooling and absorbing ammonia absorption tower T2 II section of ammonia absorption tower T2 II section top from Partial cleansing phlegma.Gas phase through cooling and absorbing is entered into bottom ammonia absorption tower T2 III section by chimney plate.
And then adopt Partial cleansing phlegma to deliver to rising part NH3 bottom the cooling and absorbing ammonia absorption tower T2 II section of ammonia absorption tower T2 III section top.Finally produce qualified weak ammonia.Owing to absorbing heat release, now higher from weak ammonia temperature bottom ammonia absorption tower T2 III section, deliver to ammoniacal liquor water cooler E5 cooling finally by aqua ammonia pump P3 and send battery limit (BL).In addition a part of cooled weak ammonia as refrigerant circulation to ammonia absorption tower T2 III section top.Phlegma out at the bottom of ammonia absorption tower T2 tower is sent into stripping tower T1 middle and lower part after being pressurizeed by force (forcing) pump P2 and is carried out stripping again.

Claims (2)

1. produce the device of weak ammonia containing ammonia conversion lime set waste water for one kind, it is characterized in that, comprise stripping tower and ammonia absorption tower, described ammonia absorption tower inside is formed by three sections that are communicated with successively, wherein the Ith section is positioned at the bottom of described ammonia absorption tower, the IIth section of middle part being positioned at described ammonia absorption tower, the IIIth section of top being positioned at described ammonia absorption tower, with changing device convert that condensate outlet is connected containing ammonia first contain ammonia and convert the other end of lime set line of pipes and first of described stripping tower top and contain ammonia and convert lime set entrance and be connected, with changing device convert that condensate outlet is connected containing ammonia second contain ammonia and convert the first entrance that the lime set line of pipes the other end connects First Heat Exchanger, first outlet of First Heat Exchanger is connected to the first entrance of the second interchanger containing ammonia conversion lime set line of pipes by the 3rd, first outlet of the second interchanger is connected to second of described stripping tower middle and upper part containing ammonia conversion lime set entrance by the 4th containing ammonia conversion lime set line of pipes, at the bottom of described stripping tower tower, reboiler is installed, qualified purification and condensation liquid outlet is provided with at the bottom of described stripping tower tower, the outlet of described qualified purification and condensation liquid is connected to the entrance of the first force (forcing) pump through the first qualified purification and condensation liquid line of pipes, first pressurization pump outlet is connected to the second entrance of the second interchanger by the second qualified purification and condensation liquid line of pipes, second outlet of the second interchanger is connected to the entrance of watercooler by the 3rd qualified purification and condensation liquid line of pipes, the outlet of watercooler picks out battery limit (BL) by the 4th qualified purification and condensation liquid line of pipes, be provided with containing most of H at described stripper overhead 2s, CO 2light constituent distillate mouth, described containing most of H 2s, CO 2the mouth that distillates of light constituent be connected with sour gas export pipeline, be provided with containing part H in described stripping tower middle and lower part 2s, NH 3, H 2the side outlet of the light constituent of O, described containing part H 2s, NH 3, H 2the side outlet of the light constituent of O contains part H by first 2s, NH 3, H 2the light constituent line of pipes of O is connected to the second entrance of described First Heat Exchanger, and the second outlet of described First Heat Exchanger contains part H by second 2s, NH 3, H 2the light constituent line of pipes of O is connected to the bottom of described ammonia absorption tower I section, enters into ammonia absorption tower I section top from the liquid phase bottom ammonia absorption tower II section by action of gravity, and cooling and absorbing is from rising part H bottom ammonia absorption tower I section 2s, gas phase through cooling and absorbing enters into bottom ammonia absorption tower II section by chimney plate, described 4th qualified purification and condensation liquid line of pipes is connected with the 5th, the purification and condensation liquid line of pipes of six directions lattice, the purification and condensation liquid line of pipes of described pentahapto lattice is connected to described ammonia absorption tower II section top, the purification and condensation liquid line of pipes of described six directions lattice is connected to described ammonia absorption tower the IIIth section of top, the outlet of qualified weak ammonia is provided with in described ammonia absorption tower the IIIth section of bottom, described qualified weak ammonia outlet is connected to the entrance of aqua ammonia pump by the first qualified weak ammonia line of pipes, described ammoniacal liquor pump outlet is connected to the entrance of ammoniacal liquor water cooler by the second qualified weak ammonia line of pipes, and the outlet of ammoniacal liquor water cooler picks out battery limit (BL) by the 3rd qualified weak ammonia line of pipes, described 3rd qualified weak ammonia line of pipes is also connected to the 4th qualified weak ammonia line of pipes, and the other end of the 4th qualified weak ammonia line of pipes is connected to the refrigerant circulation mouth at described ammonia absorption tower III section top, condensate outlet is provided with at the bottom of described ammonia absorption tower tower, described condensate outlet is connected to the entrance of the second force (forcing) pump by the first phlegma line of pipes, and the second pressurization pump outlet is connected to the condensate inlet of stripping tower middle and lower part by the second phlegma line of pipes, described ammonia absorption top of tower is provided with offgas outlet, and described offgas outlet sends battery limit (BL) by the first tail gas output tube.
2. a kind of ammonia that contains converts the device that lime set waste water produces weak ammonia as claimed in claim 1, it is characterized in that, described tail gas output tube is also connected with a N2 and supplements pipe.
CN201420778244.8U 2014-12-10 2014-12-10 A kind of device producing weak ammonia containing ammonia conversion lime set waste water Withdrawn - After Issue CN204342463U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104445474A (en) * 2014-12-10 2015-03-25 上海国际化建工程咨询公司 Method and device for preparing diluted ammonia water from ammonia-containing shift condensate wastewater

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104445474A (en) * 2014-12-10 2015-03-25 上海国际化建工程咨询公司 Method and device for preparing diluted ammonia water from ammonia-containing shift condensate wastewater
CN104445474B (en) * 2014-12-10 2016-06-29 上海国际化建工程咨询公司 A kind of conversion lime set waste water containing ammonia produces method and the device of weak ammonia

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