CN104986816B - Process and apparatus for carrying out wastewater desorption and falling film evaporation on coking sewage - Google Patents

Process and apparatus for carrying out wastewater desorption and falling film evaporation on coking sewage Download PDF

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CN104986816B
CN104986816B CN201510084437.2A CN201510084437A CN104986816B CN 104986816 B CN104986816 B CN 104986816B CN 201510084437 A CN201510084437 A CN 201510084437A CN 104986816 B CN104986816 B CN 104986816B
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waste water
falling film
desorber
film evaporator
steam
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CN104986816A (en
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吴大川
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Dalian Haotong Environmental Protection Engineering Technology Co ltd
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Abstract

The present invention relates to a coking sewage desorption processes, which comprises that 1) coking sewage enters the top portion of a desorption tower, is subjected to steam stripping desorption, and then is discharged from the top portion of the tower; 2) the desorption gas enters a falling film evaporator, and is subjected to heat exchange with high-temperature wastewater to form ammonia vapor with an ammonia concentration of 10-20% and a condensed liquid; 3) the circulating wastewater introduced into the falling film evaporator from the desorption tower is evaporated to produce secondary steam; and 4) the low-temperature secondary steam is compressed into high-temperature and high-pressure overheating steam with a pressure of 0.14-0.6 MPa (A) and a temperature of 110-220 DEG C through a compressor, and is conveyed into the desorption tower as the supplement steam for the heating steam. The apparatus for achieving the process comprises the desorption tower, the falling film evaporator and the compressor. Compared with the process and the apparatus in the prior art, the process and the apparatus of the present invention have the following beneficial effects that the waste heat of the desorption gas on the top portion of the desorption tower can be recovered and utilized, the low-temperature heat source is converted into the high-temperature heat source through the compressor so as to return to the desorption tower and be reused, the consumption of the new steam is reduced by more than or equal to 60-75%, and characteristics of reasonable and compact process, simple operation, less equipment configuration and low investment cost are provided.

Description

A kind of coked waste water desorbing waste water falling film evaporation technology and device
Technical field
The present invention relates to coked waste water processing technology field, particularly relate to a kind of coked waste water desorbing waste water falling film evaporation technology and Device.
Background technology
The coked waste water that coking production process produces mainly includes coking coal surface water, coking water of constitution and pollution discharge water, burnt Change sewage impurities complicated component, mainly contain H2S、NH3, HCN, the component such as phenols and polycyclic aromatic hydrocarbon.Coking is dirty Water processes and mainly comprises the processes of solvent method dephenolize, desorption method removing H2S、NH3, HCN, biological degradation method reduce efflux wastewater COD, wherein desorption method is one of important procedure of sewage disposal, its thermal energy consumption (steam consumption, gas consumption etc.) The cost processing overall process with coked waste water is closely related.
At present, coked waste water desorption technique generally uses desorption method to remove H therein2S、NH3, the component such as HCN, main work Skill process is: after at the bottom of coked waste water and desorber, wastewater heat exchange heats up, and sends into desorber top, and in desorber with rising Steam counter-flow contacts and is heated, strips, and desorbing tower top produces containing NH3、H2S、HCN、H2The stripping gas of the components such as O Body, enters ammonia dephlegmator;In ammonia dephlegmator utilize cooling water by desorption gas cool down, condensing, the ammonia vapour of condensing generation send To coke oven gas system, dephlegmator condensed liquid backflow desorbing tower top, the hot waste water produced at the bottom of desorber send biochemistry after cooling Treatment process.
Increase the quantity of steam at the bottom of desorber and can be effectively reduced impurity content in waste water, but also can increase the life of desorption step accordingly Producing cost, therefore the improvement to coked waste water desorption technique is devoted to while improving desorption efficiency to reduce disappearing of heat energy always Consumption.
The Chinese patent of Application No. 201210275298.8 (filing date on August 3rd, 2012) discloses " a kind of surplus Remaining ammonia heat pump distillation system ", " steam (vapor) outlet at original ammonia still top is simultaneously connected to heat pump and point contracting by three-way valve Steam in device, heat pump and dephlegmator is pooled to cooler, and the ammonia in cooler sequentially passes through finished product ammonia vessel backward With remove desulfurizer after reflux pump ".Described in this patent, remained ammonia heat pump distillation system is to utilize tower top by absorption heat pump Ammonia vapour heat is for heating at the bottom of tower.Working medium in absorption heat pump is in ammonia vapour heat exchanger and ammonia vapour heat exchange, working medium absorbing ammonia vapour heat Amount is vaporized into steam, and steam delivers to cooler through compressor pressurization again;Ammonia vapour is condensed into ammonia, and partial ammonia water refluxes, sends outside. Waste water at the bottom of tower send the steam of cooler cooling compression, and waste water absorbs heat and returns at the bottom of ammonia still.Absorption heat pump heat in this system Amount transfer is to be realized by twice heat exchange (ammonia vapour working medium, working medium waste water), there is system operation complexity, equipment throwing The problem that money is high, heat utilization ratio is low.These problems greatly hinder the popularization and application at coking industry of this system.
Summary of the invention
The invention provides a kind of coked waste water desorbing waste water falling film evaporation technology, the waste heat of desorbing tower top desorption gas can be returned Receive and utilize, and by compressor, low-temperature heat source is converted into high temperature heat source and returns desorber and use, minimizing initial steam consumption 60~ More than 75%, and flow process is the compactest, simple to operate, equipment configures less, input cost is low;Invention also provides use In the device realizing this technique.
In order to achieve the above object, the present invention realizes by the following technical solutions:
A kind of coked waste water desorbing waste water falling film evaporation technology, comprises the steps:
1) coked waste water after heat exchange enters desorber top, adds vapours and enters at the bottom of desorber, the NH in coked waste water3、 H2The components such as S, HCN desorption gas after steam stripping desorbing is discharged by tower top;
2) desorption gas gone out from desorber top row enters the heating chamber of falling film evaporator, the part hot waste water at the bottom of desorber Forming ammonia density after entering the separation chamber of falling film evaporator, desorption gas and wastewater heat exchange is 10~the ammonia vapour of 20% and condensed liquid; Wherein ammonia vapour send coke oven gas system, and condensed liquid flows in raw material sump and collects with coked waste water, then by raw material sewage pump Send sewage/wastewater heat exchange device, after the hot waste water heat exchange extracted out at the bottom of desorber, enter desorber top with by waste water pump;Change Waste water after heat drop temperature send biochemical operation to process further;
3) introduce the recycling waste water recycling waste water bottom falling film evaporator from desorber and be pumped to the liquid at falling film evaporator top Body distribution apparatus enters heating pipe after forming uniform liquid film, and part evaporation produces low temperature indirect steam in pipe;Low temperature secondary Steam and recycling waste water flow into separation chamber in the lump, and the low temperature indirect steam after gas-liquid separation sends into compressor;
4) low temperature indirect steam boil down to pressure is 0.14~0.6MPa (A) by compressor, temperature 110~the high temperature of 220 DEG C High pressure superheated steam also sends into desorber as the supplementary steam adding vapours.
The desorption gas temperature that desorber top row goes out is 95~135 DEG C, and condensing rear ammonia stripping temperature is 90~115 DEG C, desorber End hot waste water temperature is 98~155 DEG C, falling film evaporator add the low temperature indirect steam temperature produced in heat pipe be 75~ 110℃。
For realizing the device of a kind of coked waste water desorbing waste water falling film evaporation technology, including by the desorber of pipeline communication, Falling film evaporator and compressor, the desorption gas outlet of described desorber tower top connects the gas of falling film evaporator heating chamber and enters Mouthful, the steam (vapor) outlet of falling film evaporator connects the steam inlet of compressor, and the steam (vapor) outlet of compressor connects to be mended bottom desorber Fill steam inlet;The ammonia vapor outlet of falling film evaporator additionally connects coal gas system, and the condensed liquid outlet of falling film evaporator connects former Material sump;The recycling waste water entrance of falling film evaporator separator connects the hot waste water outlet of desorber bottom, falling film evaporator Recycling waste water pump is set in bottom separation chamber and overhead-liquid distribution apparatus connecting pipe.
Described raw material sump is additionally provided with coked waste water entrance, and the coked waste water of raw material sump exports by raw material sewage Pump, sewage/wastewater heat exchange device connection desorber top coked waste water entrance, sewage/wastewater heat exchange device is additionally by waste water pump even General solution inhales the outlet of tower bottom hot waste water.
Compared with prior art, the invention has the beneficial effects as follows:
1) heat recovery to desorbing tower top desorption gas, produces low temperature indirect steam by heat cycles waste water, adopts With compressor to low temperature indirect steam compressed action so that it is become high-temperature high-pressure overheat steam and make as thermal source return desorber With, reduce initial steam consumption 60~more than 75%;
2) using falling film evaporator evaporation, evaporability is strong, and heat utilization efficiency is high, can improve desorption efficiency, reduces ammonia still process and gives up Water impurity content;
3) falling film evaporator uses the mode being circulated heat exchange from desorber extraction hot waste water, it is not necessary to draw outward circulating cooling Water, energy-saving and cost-reducing;
4) desorber tower top is without backflow, can improve sewage desorption efficiency;
5) technological process is the compactest, simple to operate, and equipment configures less, input cost is low.
Accompanying drawing explanation
Fig. 1 is the general flow chart of technique of the present invention.
In figure: 1. desorber 2. falling film evaporator 3. sewage/wastewater heat exchange device 4. compressor 5. raw material sump 6. Waste water pump 7. recycling waste water pump 8. raw material sewage pump
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described further:
See Fig. 1, be the general flow chart of technique of the present invention, a kind of coked waste water desorbing waste water falling film evaporation of the present invention Technique, comprises the steps:
1) coked waste water after heat exchange enters desorber 1 top, adds vapours and enters at the bottom of desorber, the NH in coked waste water3、 H2The components such as S, HCN desorption gas after steam stripping desorbing is discharged by tower top;
2) desorption gas gone out from desorber top row enters the heating chamber of falling film evaporator 2, and the part high temperature at the bottom of desorber gives up Water forms ammonia density after entering the separation chamber of falling film evaporator 2, desorption gas and wastewater heat exchange be 10~the ammonia vapour of 20% and coagulating Contracting liquid;Wherein ammonia vapour send coke oven gas system, and condensed liquid flows in raw material sump 5 and collects with coked waste water, then by former Material sewage pump 8 send sewage/wastewater heat exchange device 3, laggard from the hot waste water heat exchange extracted out at the bottom of desorber with by waste water pump 6 Enter desorbing tower top;Waste water after heat exchange cooling send biochemical operation to process further;
3) falling film evaporator 2 delivered to by the recycling waste water recycling waste water pump 7 introduced bottom falling film evaporator 2 from desorber 1 The liquid distribution device at top enters heating pipe after forming uniform liquid film, and part evaporation produces low temperature indirect steam in pipe; Low temperature indirect steam and recycling waste water flow into separation chamber in the lump, and the low temperature indirect steam after gas-liquid separation sends into compressor 4;
4) low temperature indirect steam boil down to pressure is 0.14~0.6MPa (A) by compressor 4, temperature 110~the height of 220 DEG C Temperature high pressure superheated steam also sends into desorber 1 as the supplementary steam adding vapours.
The desorption gas temperature that desorber top row goes out is 95~135 DEG C, and condensing rear ammonia stripping temperature is 90~115 DEG C, desorber End hot waste water temperature is 98~155 DEG C, falling film evaporator 2 add the low temperature indirect steam temperature produced in heat pipe be 75~ 110℃。
For realizing the device of a kind of coked waste water desorbing waste water falling film evaporation technology, including by the desorber 1 of pipeline communication, Falling film evaporator 2 and compressor 4, the desorption gas outlet of described desorber 1 tower top connects falling film evaporator 2 heating chamber Gas access, the steam (vapor) outlet of falling film evaporator 2 connects the steam inlet of compressor 4, and the steam (vapor) outlet of compressor 4 connects Steam inlet is supplemented bottom desorber 1;The ammonia vapor outlet of falling film evaporator 2 additionally connects coal gas system, falling film evaporator 2 Condensed liquid outlet connect tar stock sump 5;The recycling waste water entrance of falling film evaporator 2 separator connects desorber 1 Bottom hot waste water outlet, sets recycling waste water on separation chamber and overhead-liquid distribution apparatus connecting pipe bottom falling film evaporator 2 Pump 7.
Described raw material sump 5 is additionally provided with coked waste water entrance, and the coked waste water outlet of raw material sump 5 is dirty by raw material Water pump 8, sewage/wastewater heat exchange device 3 connects desorber 1 top coked waste water entrance, and sewage/wastewater heat exchange device 3 additionally leads to Cross waste water pump 6 and connect hot waste water outlet bottom desorber 1.
Following example are implemented under premised on technical solution of the present invention, give detailed embodiment and concrete Operating process, but protection scope of the present invention is not limited to following embodiment.In following embodiment, method therefor is as without saying especially Bright it is conventional method.
[embodiment 1]
Coked waste water enters in raw material sump 5, extracts out with raw material sewage pump 8 and send sewage/wastewater heat exchange device 3 to give up with high temperature After water heat exchange is warming up to 97 DEG C, send into desorber 1 top, in Ta Nei and upflowing vapor counter current contacting, by heating, vapour The effect that carries is with desorbing NH contained therein3、H2The components such as S, HCN.
Gained hot waste water temperature 105 DEG C after desorbing, major part is dirty with coking through sewage/wastewater heat exchange device 3 with waste water pump 6 Sending biochemical operation to process further after water heat exchange cooling, small part hot waste water enters the separation chamber of falling film evaporator 2.Falling liquid film Recycling waste water recycling waste water pump 7 bottom vaporizer 2 is delivered to the liquid distribution device at vaporizer 2 top and is formed uniform liquid film Entrance adds heat pipe, and part evaporation produces 0.085MPa (A), the low temperature indirect steam of 95 DEG C in pipe.
Low temperature indirect steam and recycling waste water flow into the separation chamber of falling film evaporator 2 in the lump, and after this gas-liquid separation, steam enters Enter compressor 4, by compressor 4 to its compressed action so that it is become 0.15MPa (A), the superheated steam of 125 DEG C.Pressure The superheated steam of contracting machine 4 output enters desorber 1 and heats upflowing vapor needed for the generation desorbing of tower reactor waste water.
The 0.12MPa (A) that desorber 1 top produces, the desorption gas of 103 DEG C enter the heating chamber of falling film evaporator 2, heating It is cooled to 99 DEG C while recycling waste water, forms condensed liquid and the ammonia vapour of ammonia density 15%.Ammonia vapour send coke oven gas system, Condensed liquid flows in raw material sump 5.
[embodiment 2]
Coked waste water enters in raw material sump 5, extracts out with raw material sewage pump 8 and send sewage/wastewater heat exchange device 3 to give up with high temperature After water heat exchange is warming up to 98 DEG C, send into desorber 1 top, in Ta Nei and upflowing vapor counter current contacting, by heating, vapour The effect that carries is with desorbing NH contained therein3、H2The components such as S, HCN.
Gained hot waste water temperature 106 DEG C after desorbing, major part is dirty with coking through sewage/wastewater heat exchange device 3 with waste water pump 6 Sending biochemical operation to process further after water heat exchange cooling, small part hot waste water enters the separation chamber of falling film evaporator 2.Falling liquid film Recycling waste water recycling waste water pump 7 bottom vaporizer 2 is delivered to the liquid distribution device at vaporizer 2 top and is formed uniform liquid film Entrance adds heat pipe, and part evaporation produces 0.051MPa (A), the low temperature indirect steam of 82 DEG C in pipe.
Low temperature indirect steam and recycling waste water flow into the separation chamber of falling film evaporator 2 in the lump, and after this gas-liquid separation, steam enters Enter compressor 4, by compressor 4 to its compressed action so that it is become 0.157MPa (A), the superheated steam of 135 DEG C.Pressure The superheated steam of contracting machine output enters desorber 1 and heats upflowing vapor needed for the generation desorbing of tower reactor waste water.
The 0.125MPa (A) that desorber 1 top produces, the desorption gas of 103.5 DEG C enter the heating chamber of falling film evaporator 2, It is cooled to 98 DEG C while heat cycles waste water, forms condensed liquid and the ammonia vapour of ammonia density 15.2%.Ammonia vapour send coke-oven coal Gas system, condensed liquid flows in raw material sump 5.
[embodiment 3]
Coked waste water enters in raw material sump 5, extracts out with raw material sewage pump 8 and send sewage/wastewater heat exchange device 3 to give up with high temperature After water heat exchange is warming up to 106 DEG C, send into desorber 1 top, in Ta Nei and upflowing vapor counter current contacting, by heating, vapour The effect that carries is with desorbing NH contained therein3、H2The components such as S, HCN.
Gained hot waste water temperature 114 DEG C after desorbing, major part is dirty with coking through sewage/wastewater heat exchange device 3 with waste water pump 6 Sending biochemical operation to process further after water heat exchange cooling, small part hot waste water enters the separation chamber of falling film evaporator 2.Falling liquid film Recycling waste water recycling waste water pump 7 bottom vaporizer 2 is delivered to the liquid distribution device at vaporizer 2 top and is formed uniform liquid film Entrance adds heat pipe, and part evaporation produces 0.096MPa (A), the low temperature indirect steam of 98 DEG C in pipe.
Low temperature indirect steam and recycling waste water flow into the separation chamber of falling film evaporator 2 in the lump, and after this gas-liquid separation, steam enters Enter compressor 4, by compressor 4 to its compressed action so that it is become 0.19MPa (A), the superheated steam of 142 DEG C.Pressure The superheated steam of contracting machine 4 output enters desorber 1 and heats upflowing vapor needed for the generation desorbing of tower reactor waste water.
The 0.15MPa (A) that desorber 1 top produces, the desorption gas of 108 DEG C enter the heating chamber of falling film evaporator 2, heating It is cooled to 105 DEG C while recycling waste water, forms condensed liquid and the ammonia vapour of ammonia density 18%.Ammonia vapour send coke-stove gas system System, condensed liquid flows in raw material sump 5.

Claims (4)

1. a coked waste water desorbing waste water falling film evaporation technology, it is characterised in that comprise the steps:
1) coked waste water after heat exchange enters desorber top, and heating steam enters at the bottom of desorber, the NH in coked waste water3、H2S, HCN desorption gas after steam stripping desorbing is discharged by tower top;
2) desorption gas gone out from desorber top row enters the heating chamber of falling film evaporator, and the part hot waste water at the bottom of desorber enters the separation chamber of falling film evaporator, and forming ammonia density after desorption gas and wastewater heat exchange is 10~the ammonia of 20% and condensed liquid;Wherein ammonia send coke oven gas system, and condensed liquid flows in raw material sump and collects with coked waste water, is then pumped sewage/wastewater heat exchange device by raw material sewage, enters desorber top with by waste water pump after the hot waste water heat exchange extracted out at the bottom of desorber;Waste water after heat exchange cooling send biochemical operation to process further;
3) introduce the recycling waste water recycling waste water bottom falling film evaporator from desorber to be pumped to enter heating pipe, and part evaporation generation low temperature secondary steam in pipe after the liquid distribution device at falling film evaporator top forms uniform liquid film;Low temperature secondary steam and recycling waste water flow into separation chamber in the lump, and the low temperature secondary steam after gas-liquid separation sends into compressor;
4) low temperature secondary steam boil down to pressure is 0.14~0.6MPaA by compressor, and temperature 110~the High Temperature High Pressure superheated vapor of 220 DEG C also send into the desorber supplementary steam as heating steam.
A kind of coked waste water desorbing waste water falling film evaporation technology the most according to claim 1, it is characterized in that, the desorption gas temperature that desorber top row goes out is 95~135 DEG C, condensing rear ammonia temperature is 90~115 DEG C, hot waste water temperature at the bottom of desorber is 98~155 DEG C, and the low temperature secondary steam temperature that falling film evaporator produces in adding heat pipe is 75~110 DEG C.
A kind of coked waste water desorbing waste water falling film evaporation technology the most according to claim 1, it is characterized in that, the device used includes by the desorber of pipeline communication, falling film evaporator and compressor, the desorption gas outlet of described desorber tower top connects the gas access of falling film evaporator heating chamber, the vapor outlet port of falling film evaporator connects the vapour inlet of compressor, and the vapor outlet port of compressor connects supplements vapour inlet bottom desorber;The ammonia outlet of falling film evaporator additionally connects coal gas system, and the condensed liquid outlet of falling film evaporator connects raw material sump;The recycling waste water entrance of falling film evaporator separator connects the hot waste water outlet of desorber bottom, sets recycling waste water pump bottom falling film evaporator on separation chamber and overhead-liquid distribution apparatus connecting pipe.
A kind of coked waste water desorbing waste water falling film evaporation technology the most according to claim 3, it is characterized in that, described raw material sump is additionally provided with coked waste water entrance, the coked waste water outlet of raw material sump is by raw material sewage pump, sewage/wastewater heat exchange device connection desorber top coked waste water entrance, and sewage/wastewater heat exchange device is additionally by hot waste water outlet bottom waste water pump connection desorber.
CN201510084437.2A 2015-02-16 2015-02-16 Process and apparatus for carrying out wastewater desorption and falling film evaporation on coking sewage Expired - Fee Related CN104986816B (en)

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CN105906123B (en) * 2016-05-26 2018-06-19 苏州派宁环保科技有限公司 The system and method for processing wastewater from chemical industry based on stripping and MVR group technologies
CN108069482B (en) * 2016-11-11 2020-01-10 中国石油化工股份有限公司抚顺石油化工研究院 Wastewater treatment process and system
CN108069479B (en) * 2016-11-11 2020-01-10 中国石油化工股份有限公司抚顺石油化工研究院 Wastewater treatment method and system
CN112973387A (en) * 2021-04-08 2021-06-18 四川金象赛瑞化工股份有限公司 Combined treatment method and system for waste water and waste gas

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JP2005098551A (en) * 2003-09-22 2005-04-14 Minoru Morita Method and facility for recovering energy generated in sewage treatment plant
CN102241418A (en) * 2011-05-20 2011-11-16 新煤化工技术(上海)有限公司 Negative pressure distillation equipment and method for residual ammonia water
CN102671510B (en) * 2011-11-29 2015-08-12 中国石油化工股份有限公司 The recovery process of flue gas CO2
CN203411359U (en) * 2013-07-31 2014-01-29 张卫东 Device for processing residual ammonia water of coke oven with negative pressure flash evaporation method

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