CN104445482A - Process of treating coking wastewater by utilizing coke quenching heat energy - Google Patents
Process of treating coking wastewater by utilizing coke quenching heat energy Download PDFInfo
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- CN104445482A CN104445482A CN201410829435.7A CN201410829435A CN104445482A CN 104445482 A CN104445482 A CN 104445482A CN 201410829435 A CN201410829435 A CN 201410829435A CN 104445482 A CN104445482 A CN 104445482A
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- steam
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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
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
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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
- C02F1/048—Purification of waste water by evaporation
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B39/00—Cooling or quenching coke
- C10B39/04—Wet quenching
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Coke Industry (AREA)
Abstract
The invention belongs to a process of treating coking wastewater and particularly relates to a process of treating coking wastewater by utilizing coke quenching heat energy. The process comprises the following six steps of: performing steam coke quenching, removing impurities for the steam for the first time, removing combustible gases in the steam by combusting, performing steam cooling, removing impurities of the steam for the second time, and performing steam boosting. The process of treating coking wastewater by utilizing coke quenching heat energy disclosed by the invention has the following technical advantages of recycling the energy more completely, treating the wastewater more completely, saving the wastewater treatment cost, being relatively less in investment in comparison with a dry-process coke quenching process, not only can be used for consuming original wastewater which is difficult to treat of the coking plant, but also can be used for treating high-pollution wastewater produced by other projects, greatly reducing the investment of the coking plant in wastewater treatment, providing conditions for developing a new production for the coking enterprises. The coking wastewater can be consumed by the coking plant, the residual steam can be transmitted outside, and construction to environmental protection is extremely great.
Description
technical field:
The invention belongs to a kind of Coking Waste Water Treatment Process, be specially a kind of technique utilizing quenching heat energy process coked waste water.
background technology:
Quenching is the important step in high-temperature coking chemical industry, traditional wet quenching technique is after coke is come out of the stove, under delivering to coke quenching tower by quenching groove, be sprayed directly on on red Jiao with water, evaporator strip by moisture becomes much more popular burnt heat, coke temperature is down to less than 100 degrees Celsius, the steam produced directly is discharged in air, the feature of this method is reduced investment, operation and maintenance is simple, shortcoming is: along with coke quenching steam is diffused in air, a large amount of heat energy is not utilized, water resources consumption is large, red burnt quick refrigeration, reduce coke quality, coke powder, inflammable gas and toxic organic compound etc. are diffused in air with entrainment with steam, major polluting atmosphere environment, also create a large amount of phenol water.
The dry quenching(of coke) technique of current trend is a kind of method cooling red Jiao with low temperature nitrogen, in the process of dry quenching(of coke), red Jiao loads from coke dry quenching furnace top, low temperature nitrogen is sent in coke dry quenching furnace by recycle blower, absorb the heat of red Jiao, cooled coke temperature is down to less than 200 degrees Celsius, discharge bottom coke dry quenching furnace, nitrogen after intensification carries out heat exchange through waste heat boiler, by-product high pressure superheated steam enters steam turbine drive electrical generators and generates electricity, cooled nitrogen gas blower pressurization returns in coke dry quenching furnace and again recycles, this method feature is energy-conservation, improve coke quality aspect and be better than wet quenching, shortcoming is: floor space is large, device structure is complicated, manufacture difficulty is large, maintenance cost is high, investment is many, these Dou Shi coke-oven plants are difficult to bear, be difficult to promote, also have, dry quenching(of coke) is that the overheated steam that produces by the heat of red Jiao is to enter the generating of steam turbine drive electrical generators, final electric energy uses on electric motor and becomes mechanical energy, consider waste heat boiler, the efficiency factor of steam turbine and generator, the heat energy of red Jiao only has at most 60% to change into electric energy, so dry coke quenching method neither be best power-economizing method.
Coked waste water is the high concentrated organic wastewater produced in coking, its complicated component, comprise the organic pollutants such as a large amount of phenols, biphenyl, pyridine, indoles and quinoline, also containing venomous injurants such as cyanogen, inorganic fluorion and ammonia nitrogens, pollutent colourity is high, belong to the trade effluent compared with bio-refractory, the wastewater treatment of coke-oven plant adopts activated sludge method usually.
Various industry has chemical oxidization method, burning method, steaming process, absorption method, biochemical process, solvent extration and emulsion liquid membrane etc. containing the treatment technology of phenol water.Wherein burning method, when sewage is at temperature about 1000 DEG C environment, almost any organism all resolves into nontoxic hydrogen and carbon monoxide, and this method is not only very thorough to phenol process, 99.99% is reached to organic transformation efficiency various in sewage, meets environmental requirement completely.But this method needs a large amount of external source, also need sewage to have certain calorific value, energy consumption is high, in fact promotes being difficult to.
Present Coke Market is superfluous, coke oven load is not high, residue coke(oven)gas is little, the all supporting coke in a lot of coke-oven plant or coal gasification furnace gas making, improve the load of methyl alcohol, synthetic ammonia or glycol unit, and consuming unnecessary coke, the type selecting of vapourizing furnace much all selects pure oxygen-steam normal pressure continuous gasification process, and this vapourizing furnace needs a large amount of external low-pressure steam to work as vaporized chemical.
summary of the invention:
Therefore, be necessary to invent a kind of technique utilizing quenching heat energy process coked waste water.
Utilize a technique for quenching heat energy process coked waste water, comprise following operation steps:
(1) steam quenching: red Jiao (temperature is 1000 ± 50 DEG C) of harsh output is loaded in airtight quenching stove, the steam containing a small amount of coked waste water is passed in the air feeder of quenching furnace bottom, temperature is 100-150 DEG C, steam rises in quenching stove, with red burnt heat exchange, red burnt temperature drops to 150-200 DEG C gradually, discharge quenching stove, vapor temperature then rises to 800-900 DEG C gradually, discharge in the middle part of quenching stove, a certain amount of red Jiao is reserved on quenching stove top, and quenching process is carried out continuously;
(2) to the steam first time removal of impurity: the steam that quenching fire grate in above-mentioned steps (1) goes out is carried out dedusting, separates the burnt grain carried secretly in steam;
(3) in order to prevent combustible gas higher containing concentration in steam, at vapourizing furnace when producing danger in vaporized chemical process with during oxygen mix, a small amount of oxygen or air (want summing unit practical situation according to vapourizing furnace aerogenic composition and determine) is passed in steam, burn the inflammable gas produced in quenching process, now vapor temperature rises to 900-1000 DEG C;
(4) steam cooling: pass into coked waste water in the high-temperature steam in above-mentioned steps (2) after process, coked waste water is evaporated, reduces vapor temperature (to < 200 DEG C) simultaneously, increases quantity of steam;
(5) to the removal of impurity of steam second time: the steam after process in above-mentioned steps (3) is carried out dedusting, and separate the coke powder carried secretly in steam, treated steam, temperature is 150-200 DEG C;
(6) to lower the temperature to coke to ensure that steam has the conveying of enough pressure heads and carries out circulating, supercharger must be established on steam-pipe, after supercharging, a part of opposing steam flow participates in quenching cycle in step (1), and remainder steam is sent and out-of-bounds passed into vapourizing furnace and use as vaporized chemical.
The present invention has following technological merit:
(1) energy recovery is more thorough: directly and waste water heat exchange, centre does not have other links to red Jiao, in totally enclosed equipment, except the heat that piping insulation is lost, does not substantially have power loss;
(2) sewage disposal is more thorough: finally enter in vapourizing furnace for red burnt interval, the roasting kiln of the hazardous and noxious substances in coked waste water through quenching stove, these regional temperatures all, more than 1000 DEG C, almost all decompose;
(3) sewage disposal expense is saved: the sewage producing coke per ton only has 0.3-0.4 ton, but because concentration of wastewater is high, complicated component, in the Wastewater Treated by Activated Sludge Process operation that coke-oven plant adopts usually, must dilute sewage and temperature adjustment etc. pre-treatment link, cause the process water yield entering biochemistry pool very large, an one Ge200Wan Dun coke-oven plant generally supporting active sludge treatment operation needs to invest about forty-two million unit, the processing cost of waste water per ton is also higher, and red Jiao per ton can produce steam 0.5-0.6 ton, so the present invention can process the high-concentration industrial sewage of coke-oven plant completely,
(4) dry quenching(of coke) technique is compared, less investment: contrast dry quenching(of coke), invention increases sewage sedimentation and sewage water filtration link, also add steam boosting link, but be omitted circulator, Steam Turbine, power house, Air-Cooling Island, nitrogen station processed and circulating water to unify Desalting Water System, also eliminate activated-sludge processing apparatus, laid down cost can reduce by 1/2nd;
(5) the present invention not only can consume the original reluctant sewage in coke-oven plant, the high pollution waste water that even sundry item produces also can process, significantly reduce coke-oven plant to the investment of sewage disposal, open up new project for coal chemical enterprise and provide condition, mainly coke-oven plant self just can consume coked waste water, residue steam can be sent outside, to environmental protection contribution greatly.
embodiment:
Utilize a technique for coked waste water quenching, comprise following operation steps:
(1) steam quenching: red Jiao (temperature is 1000 ± 50 DEG C) of harsh output is loaded in airtight quenching stove, the steam containing a small amount of coked waste water is passed in the air feeder of quenching furnace bottom, temperature is 100-150 DEG C, steam rises in quenching stove, with red burnt heat exchange, red burnt temperature drops to 150-200 DEG C gradually, discharge quenching stove, vapor temperature then rises to 800-900 DEG C gradually, discharge in the middle part of quenching stove, quenching stove top needs reserved a certain amount of red Jiao, and quenching process is carried out continuously;
(2) to the steam first time removal of impurity: the steam that quenching fire grate in above-mentioned steps (1) goes out is carried out dedusting, separates the burnt grain carried secretly in steam;
(3) in order to prevent combustible gas higher containing concentration in steam, at vapourizing furnace when producing danger in vaporized chemical process with during oxygen mix, a small amount of oxygen or air (want summing unit practical situation according to vapourizing furnace aerogenic composition and determine) is passed in steam, burn the inflammable gas produced in quenching process, now vapor temperature rises to 900-1000 DEG C;
(4) steam cooling: pass into coked waste water in the high-temperature steam in above-mentioned steps (3) after process, coked waste water is evaporated, reduces vapor temperature (to < 200 DEG C) simultaneously, increases quantity of steam;
(5) to the removal of impurity of steam second time: the steam after process in above-mentioned steps (3) is carried out dedusting, and separate the coke powder carried secretly in steam, treated steam, temperature is 150-200 DEG C;
(6) to lower the temperature to coke to ensure that steam has the conveying of enough pressure heads and carries out circulating, supercharger must be established on steam-pipe, after supercharging, participate in quenching cycle in a part of opposing steam flow to step (1), remainder steam passes into vapourizing furnace and uses as vaporized chemical.
Coked waste water is due to containing a large amount of impurity and greasy dirt, the physical cleaning operations such as oil removal, flotation and sandstone filtration are had to pass through before quenching, remove the foreign material in sewage, prevent blocking shower nozzle and pollute coke, meanwhile, because sewage to carry out at steam that burning is complete later enters temperature-reducing tower, require the combustiblesubstance concentration in sewage, below limits of explosion, prevent sending steam outside and contain combustible gas concentration higher than limits of explosion, cause danger in vapourizing furnace.
Containing the sewage of the organic impuritys such as phenol, benzene, ammonia, the red focus layer in quenching stove, combustion chamber, this three places high-temperature area of the zone of combustion of vapourizing furnace, temperature has all exceeded 1000 degrees Celsius, and organic poison can decompose completely, reaches harmless treatment.
Supporting combustable gas concentration and oxygen concentration on-Line Monitor Device on pipeline on pipeline behind combustion chamber and after temperature-reducing tower, monitoring combustible gas concentration, is down to below limits of explosion and can enters next link, prevent danger.
Quenching process reduces coke temperature by water vapor, because water vapour is rare gas element, is the same substantially to improving the contribution of coke quality with dry coke quenching technique.
Claims (2)
1. utilize a technique for quenching heat energy process coked waste water, it is characterized in that: comprise following operation steps:
(1) steam quenching: be that red Jiao of 1000 ± 50 DEG C loads in airtight quenching stove by the temperature of harsh output; the steam containing a small amount of coked waste water is passed in the air feeder of quenching furnace bottom; temperature is 100-150 DEG C; steam rises in quenching stove; with red burnt heat exchange; red burnt temperature drops to 150-200 DEG C gradually; discharge quenching stove; vapor temperature then rises to 800-900 DEG C gradually; discharge in the middle part of quenching stove; a certain amount of red Jiao is reserved on quenching stove top, and quenching process is carried out continuously;
(2) to the steam first time removal of impurity: the steam that quenching fire grate in above-mentioned steps (1) goes out is carried out dedusting, separates the coke powder carried secretly in steam;
(3) in order to prevent combustible gas higher containing concentration in steam, at vapourizing furnace when producing danger in vaporized chemical process with during oxygen mix, in steam, pass into a small amount of oxygen, burn the inflammable gas produced in quenching process, now vapor temperature rises to 900-1000 DEG C;
(4) steam cooling: pass into coked waste water in the high-temperature steam in above-mentioned steps (3) after process, is down to less than 200 DEG C by vapor temperature while coked waste water is evaporated, increases quantity of steam;
(5) to the removal of impurity of steam second time: the steam after process in above-mentioned steps (3) is carried out dedusting, and separate the coke powder carried secretly in steam, treated steam, temperature is 150-200 DEG C;
(6) in order to ensure that steam has enough pressure heads to be transported to out-of-bounds and to carry out circulating and to lower the temperature to coke, supercharger must be established on steam-pipe, after supercharging, part opposing steam flow is to participation quenching cycle in step (1), and remainder steam is delivered to and out-of-bounds passed into vapourizing furnace and use as vaporized chemical.
2. a kind of technique utilizing quenching heat energy process coked waste water as claimed in claim 1, is characterized in that: the oxygen passed in described step (3) also can be air.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410829435.7A CN104445482B (en) | 2014-12-29 | 2014-12-29 | A kind of technique utilizing quenching heat energy to process coked waste water |
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| CN201410829435.7A CN104445482B (en) | 2014-12-29 | 2014-12-29 | A kind of technique utilizing quenching heat energy to process coked waste water |
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| CN104445482A true CN104445482A (en) | 2015-03-25 |
| CN104445482B CN104445482B (en) | 2016-08-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106636500A (en) * | 2016-12-27 | 2017-05-10 | 中钢集团鞍山热能研究院有限公司 | Method and device for treating coking sewage by using blast furnace slag |
| CN107779210A (en) * | 2016-08-31 | 2018-03-09 | 邢台旭阳科技有限公司 | A kind of wet quenching system and the method for coke quenching steam recovery |
Citations (5)
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| US3790448A (en) * | 1971-03-03 | 1974-02-05 | United States Steel Corp | Method of purifying waste fluid |
| CN101016174A (en) * | 2006-02-07 | 2007-08-15 | 中冶集团建筑研究总院 | Coking sewage treatment method realizing zero discharge |
| CN101224936A (en) * | 2008-01-29 | 2008-07-23 | 北京盖雅环境科技有限公司 | Process for treating coking wastewater |
| CN101993173A (en) * | 2009-08-31 | 2011-03-30 | 吉林东圣焦化有限公司 | Improved alkaline process flow with coking sewage treatment (A/O) method |
| CN104039712A (en) * | 2011-11-21 | 2014-09-10 | 蒂森克虏伯工业解决方案股份公司 | Method and device for cleaning wastewater from a coke quenching tower with shortened catch basin dwell time |
-
2014
- 2014-12-29 CN CN201410829435.7A patent/CN104445482B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3790448A (en) * | 1971-03-03 | 1974-02-05 | United States Steel Corp | Method of purifying waste fluid |
| CN101016174A (en) * | 2006-02-07 | 2007-08-15 | 中冶集团建筑研究总院 | Coking sewage treatment method realizing zero discharge |
| CN101224936A (en) * | 2008-01-29 | 2008-07-23 | 北京盖雅环境科技有限公司 | Process for treating coking wastewater |
| CN101993173A (en) * | 2009-08-31 | 2011-03-30 | 吉林东圣焦化有限公司 | Improved alkaline process flow with coking sewage treatment (A/O) method |
| CN104039712A (en) * | 2011-11-21 | 2014-09-10 | 蒂森克虏伯工业解决方案股份公司 | Method and device for cleaning wastewater from a coke quenching tower with shortened catch basin dwell time |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107779210A (en) * | 2016-08-31 | 2018-03-09 | 邢台旭阳科技有限公司 | A kind of wet quenching system and the method for coke quenching steam recovery |
| CN106636500A (en) * | 2016-12-27 | 2017-05-10 | 中钢集团鞍山热能研究院有限公司 | Method and device for treating coking sewage by using blast furnace slag |
| CN106636500B (en) * | 2016-12-27 | 2018-10-23 | 中钢集团鞍山热能研究院有限公司 | A kind of method and device of blast furnace Slag treatment coked waste water |
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