CN109748349B - System and method for treating phenolic wastewater through pyrolysis - Google Patents
System and method for treating phenolic wastewater through pyrolysis Download PDFInfo
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Abstract
The invention discloses a system and a method for treating phenolic wastewater by pyrolysis, wherein an air humidifying tower and an incinerator are arranged, the air humidifying tower is simultaneously introduced with ambient air and the phenolic wastewater is heated by a heater and then circulated, so that phenolic humid air is continuously generated by the air humidifying tower and is introduced into the incinerator, and phenolic steam in the phenolic humid air is decomposed at high temperature in the incinerator and reacts with oxygen to generate CO2And H2And O, the flue gas generated by the incinerator contains a large amount of water vapor, and latent heat of the water vapor in the flue gas is recovered to provide a heat source for the heater or low-grade heat outside the system is used as the heat source of the heater. The invention adopts the high-temperature thermal decomposition method to treat the phenol-containing wastewater, the heat consumed by the evaporation of the phenol-containing wastewater only needs low-grade heat, and the low-grade heat can be recovered from the latent heat of water vapor formed after the evaporation of the phenol-containing wastewater, thereby realizing the high-temperature thermal decomposition treatment of the phenol-containing wastewater with low energy consumption or without consuming extra energy basically and reducing the high-temperature thermal treatment cost of the phenol-containing wastewater.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a high-temperature decomposition treatment system and a high-temperature decomposition treatment method for phenolic wastewater, which are used for treating phenolic wastewater produced in coal pyrolysis and coal gasification processes.
Background
China has a large number of industries related to coal gasification and coal pyrolysis processes, such as coal-based industrial gas adopting fixed bed coal gasification, natural gas and coal-based synthetic oil adopting fixed bed coal gasification, semi coke preparation by coal pyrolysis and the like. The gas produced in the coal gasification process contains a large amount of phenolic substances, and the phenolic substances enter water to form phenolic wastewater in the coal gas purification and washing process. The phenol-containing wastewater must be treated and cannot be discharged directly into the environment. There are many methods for treating phenol-containing wastewater, including steam chemical dephenolization, steam dephenolization, incineration, solvent extraction dephenolization, biochemical methods, and the like. However, due to the problems of investment, operation cost, application range and the like, no phenol-containing wastewater treatment method is applied in a large scale at present. Among the phenol-containing waste water treatment methods, the incineration method sprays phenol-containing waste water into an incinerator to enable phenolic substances to be subjected to oxidation reaction at the high temperature of 1100 ℃ to finally generate CO2And H2O is discharged, theThe method has simple process and thorough treatment of the phenol-containing wastewater, but the method needs to directly consume fuel due to a large amount of latent heat required by the evaporation of the phenol-containing wastewater, thereby causing high operation cost. Therefore, the invention provides the high-temperature treatment system and the high-temperature treatment method for the phenol-containing wastewater with low energy consumption, which can obviously reduce the operation cost of treating the phenol-containing wastewater by a burning method.
Disclosure of Invention
In view of the above disadvantages and shortcomings of the prior art, it is an object of the present invention to provide a system for decomposing phenol-containing wastewater at high temperature with low energy consumption, which comprises an air humidifying tower and an incinerator, wherein the air humidifying tower is used for simultaneously introducing ambient air and heated and circulated phenol-containing wastewater, such that phenol-containing humid air is continuously generated from the air humidifying tower and introduced into the incinerator, and phenol vapor in the phenol-containing humid air is decomposed at high temperature and reacts with oxygen to generate CO2And H2And O, high-temperature flue gas generated by the incinerator is used for providing a heat source for the heater or preheating ambient air entering the air humidifying tower, and in the process of treating the phenolic wastewater, the heat consumed by evaporation of the phenolic wastewater only needs low-grade heat which can be recovered from latent heat of water vapor formed after evaporation of the phenolic wastewater, so that high-temperature thermal decomposition treatment of the phenolic wastewater with low energy consumption or almost without extra energy consumption is realized, and the running cost of high-temperature thermal treatment of the phenolic wastewater is greatly reduced.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a system for treating phenolic wastewater by pyrolysis at least comprises an air humidifying tower and an incinerator and is characterized in that,
the bottom of the air humidifying tower is at least provided with an air inlet, a phenolic wastewater replenishing port and a circulating phenolic wastewater outlet, the air inlet is used for introducing ambient air into the air humidifying tower, the phenolic wastewater replenishing port is used for replenishing new phenolic wastewater to be treated to the air humidifying tower,
the top of the air humidifying tower is at least provided with a circulating phenol-containing wastewater inlet and a phenol-containing wet air outlet, and the circulating phenol-containing wastewater outlet is communicated with the air humidifying tower after passing through at least one heater through a pipelineThe inlet of the circulating phenol-containing waste water is communicated, the phenol-containing wet air outlet is communicated with the air inlet of the incinerator through a pipeline, and phenol steam in the phenol-containing wet air is decomposed at high temperature in the incinerator and reacts with oxygen to generate CO2And H2And O, a heat source of the heater is low-grade waste heat, and the low-grade waste heat can be low-temperature hot water or flue gas from the outside of the system, or can be low-temperature heat from tail flue gas of the incinerator.
Preferably, the system further comprises a flue gas washing tower, a flue gas inlet, a circulating water outlet and a condensed water drain outlet are arranged at the bottom of the flue gas washing tower, a flue gas outlet and a circulating water inlet are arranged at the top of the flue gas washing tower, the flue gas outlet of the incinerator is communicated with the flue gas inlet at the bottom of the flue gas washing tower, the circulating water outlet at the bottom of the flue gas washing tower passes through a pipeline and is communicated with the circulating water inlet at the top of the flue gas washing tower after the hot side of the heater, the flue gas washed by the circulating water is discharged from the flue gas outlet at the top of the flue gas washing tower, and the condensed water in the flue gas in the washing process is discharged from the condensed water drain outlet at the bottom of the flue gas washing tower.
Preferably, a blower and other supercharging devices are arranged on an air inlet pipeline of the air humidifying tower.
Preferably, an air inlet pipeline of the air humidifying tower is provided with an air preheater, and a heat source of the air preheater is high-temperature flue gas or high-temperature hot water generated by the incinerator.
Preferably, a control valve is arranged on the phenol-containing wastewater replenishing pipeline, when the concentration of the phenol-containing wastewater at the circulating phenol-containing wastewater outlet and/or the circulating phenol-containing wastewater inlet is higher than a set value, the control valve is opened, and new phenol-containing wastewater to be treated enters the air humidifying tower through the phenol-containing wastewater replenishing port.
Preferably, a circulating pump is further arranged on the phenolic wastewater circulating pipeline between the circulating phenolic wastewater outlet and the circulating phenolic wastewater inlet.
Preferably, the heat source of the heater may be a low-grade heat source of 150 ℃ or lower in a coal chemical process such as coal-to-oil and coal-to-methanol, or an industrial process such as refining.
In the system for treating the phenolic wastewater by pyrolysis, air in the incinerator enters the air humidifying tower before entering the incinerator, the air is directly contacted with the heated phenolic wastewater in the air humidifying tower, the phenolic wastewater is partially evaporated and concentrated, the air is heated and humidified, and meanwhile, part of phenol in the phenolic wastewater is evaporated and then enters the air. The air is heated and humidified and then sent to the incinerator, and meanwhile, the phenol vapor evaporated is brought into the incinerator. The heated phenolic wastewater is discharged after being contacted with air, is heated and heated by a heat source, and returns to the air humidifying tower after being pressurized by a pump to form circulation. As the phenol-containing waste water is evaporated and concentrated by contacting with air, new phenol-containing waste water is supplemented into the air humidifying tower.
Phenol vapor carried into the incinerator with the humid air is pyrolyzed in the incinerator, and the heat released by the reaction of the fuel with the air in the incinerator is used to generate steam and to preheat the air. The smoke discharged from the incinerator contains a large amount of water vapor, and most latent heat in the smoke is recovered and used as a heat source to heat the phenolic wastewater.
According to a second object of the present invention, there is also provided a method for pyrolysis treatment of phenol-containing wastewater, which is carried out by using the above-mentioned system of the present invention,
introducing ambient air into the air humidifying tower through an air inlet arranged at the bottom of the air humidifying tower; a phenol-containing wastewater circulating unit is formed by utilizing a circulating phenol-containing wastewater outlet arranged at the bottom of the air humidifying tower and a circulating phenol-containing wastewater inlet arranged at the top of the air humidifying tower, and the circulating phenol-containing wastewater is heated by a heater arranged on a communicating pipeline between the circulating phenol-containing wastewater outlet and the circulating phenol-containing wastewater inlet; supplementing new phenolic wastewater to be treated to the air humidifying tower by utilizing a phenolic wastewater supplementing port arranged at the bottom of the air humidifying tower;
the phenol-containing wet air generated by the air humidifying tower is introduced into the incinerator through a phenol-containing wet air outlet at the top of the air humidifying tower, and the phenol-containing wet air is contained in the incineratorPhenol vapor in phenol wet air is decomposed at high temperature and reacts with oxygen to generate CO2And H2And O, a heat source of the heater is low-grade waste heat, and the low-grade waste heat can be low-temperature hot water or flue gas from the outside of the system, or can be low-temperature heat from tail flue gas of the incinerator.
Furthermore, the flue gas generated by the incinerator is introduced into the bottom of the flue gas washing tower, a circulating water outlet at the bottom of the flue gas washing tower passes through the hot side of the heater through a pipeline and then is communicated with a circulating water inlet at the top of the flue gas washing tower, so that the circulating phenol-containing wastewater at the cold side of the heater is heated, the flue gas washed by the circulating water is discharged from a smoke outlet at the top of the flue gas washing tower, and the water condensed from the flue gas in the washing process is discharged from a condensed water discharge outlet at the bottom of the flue gas washing tower.
The principle of the invention is as follows:
the principle of the invention for treating the phenol-containing wastewater is that the phenol-containing wastewater is evaporated to become steam and gaseous phenol, and the phenol is decomposed after the steam and the gaseous phenol stay at high temperature (generally over 1100 ℃), thereby realizing the treatment of the phenol-containing wastewater. In order to evaporate the phenol-containing wastewater, the invention adopts a method of directly contacting and evaporating the phenol-containing wastewater with air, when the hot phenol-containing wastewater is contacted with the air, the water vapor pressure on the surface of the phenol-containing wastewater and the pressure of phenol vapor are both higher than the partial pressure of the phenol vapor in the air, so that water and phenol can be evaporated into the air, the heat absorbed by evaporation comes from the sensible heat of the phenol-containing wastewater, the heat temperature required by the evaporation mode is low, and the evaporation process of contacting the phenol-containing wastewater with the air belongs to a temperature-changing evaporation process, and the phenol-containing wastewater can be evaporated only by the heat below 100 ℃. The water vapor contained in the smoke generated by the combustion of the air and the fuel comes from two parts, one part is wet air brought into the incinerator, the other part is water vapor generated by the reaction of hydrogen elements in the fuel and oxygen in the air, so that the water vapor amount in the smoke discharged from the incinerator is larger than that in the air entering the incinerator, namely the latent heat amount in the smoke discharged from the incinerator is larger than that absorbed by the evaporation of the phenol-containing waste water, and generally, the dew point temperature of the smoke is also higher than that of the wet air entering the incinerator, and the latent heat of the water vapor in the smoke discharged can be recycled as a heat source for heating the phenol-containing waste water. Therefore, the high-temperature heat generated by fuel combustion is not directly consumed by the evaporation of the phenol-containing wastewater, and the heat consumed by the evaporation of the phenol-containing wastewater mainly comes from the latent heat released by the condensation of water vapor generated by the combustion and the water vapor evaporated by the phenol-containing wastewater. Based on the principle, the high-temperature thermal decomposition treatment of the phenolic wastewater with low energy consumption or without consuming extra energy basically is realized, and the operation cost of the high-temperature thermal treatment of the phenolic wastewater is greatly reduced.
Compared with the prior art, the invention is characterized in that:
1) the heat consumed by the evaporation of the phenol-containing wastewater only needs low-grade heat which can be from low-temperature heat sources such as hot water and the like which are difficult to utilize in various industrial processes;
2) the low-temperature heat consumed by the evaporation of the phenol-containing wastewater can also come from the recovery of latent heat of water vapor formed after the evaporation of the phenol-containing wastewater;
3) the invention adopts the high-temperature thermal decomposition method to treat the phenol-containing wastewater, but does not need to consume high-grade fuel heat, thereby greatly reducing the operation cost of phenol-containing wastewater treatment;
4) the phenolic wastewater treatment method can be combined with the existing coal-fired boiler, gas-fired boiler, kiln, heating furnace and the like to modify the phenolic wastewater, so that the phenolic wastewater is treated at low cost;
5) the invention can treat not only the phenol-containing wastewater, but also the wastewater containing other substances which can be decomposed by high temperature.
Drawings
FIG. 1 is a schematic view of example 1 of the present invention;
fig. 2 is a schematic view of embodiment 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings and examples.
Example 1
As shown in FIG. 1, the system for treating phenol-containing wastewater by pyrolysis according to the present invention comprisesThe device comprises an air humidifying tower 1 and an incinerator 2, wherein the bottom of the air humidifying tower 1 is provided with an air inlet, a phenol-containing wastewater replenishing port and a circulating phenol-containing wastewater outlet, the air inlet is used for introducing ambient air into the air humidifying tower 1, a fan 4 and other supercharging equipment are further arranged on an air inlet pipeline, the phenol-containing wastewater replenishing port is used for replenishing new phenol-containing wastewater to be treated to the air humidifying tower 1, the top of the air humidifying tower 1 is at least provided with a circulating phenol-containing wastewater inlet and a phenol-containing wet air outlet, the circulating phenol-containing wastewater outlet is communicated with the circulating phenol-containing wastewater inlet after passing through a phenol water circulating pump 5 and a heater 3 through pipelines, the phenol-containing wet air outlet is communicated with an air inlet of the incinerator 2 through a pipeline, and phenol vapor in the phenol-containing wet air is decomposed at high temperature and reacts with oxygen to generate CO in the incinerator 22And H2And O, the flue gas generated by the incinerator contains a large amount of water vapor, and the latent heat of the water vapor in the flue gas is recovered and then is used as a heat source of the heater 3 or used for preheating the ambient air entering the air humidifying tower.
When the system for treating the phenolic wastewater by pyrolysis works, ambient air enters the air humidifying tower 1 after being pressurized by the fan 4, the air flows upwards from the bottom in the air humidifying tower 1, hot circulating phenolic wastewater flows downwards from the top, the air is heated and humidified in the process of flowing upwards from the bottom, partial vapor and phenol in the phenolic wastewater are evaporated into the air in the process of flowing downwards from the top, and the phenolic wastewater flows out from the bottom of the air humidifying tower 1 after being cooled. The phenol-containing wastewater flowing out of the bottom of the air humidifying tower 1 is sent into the heater 3 after being boosted by the phenol water circulating pump 5, the heater 3 is a phenol-containing wastewater/circulating water heat exchanger in the embodiment, the phenol-containing wastewater is heated by circulating water on the cold side of the phenol-containing wastewater/circulating water heat exchanger, the temperature of the phenol-containing wastewater is raised, and the temperature of the circulating water is lowered. And sending the phenol-containing wastewater after the temperature rise to the top of the air humidifying tower 1. The new phenol-containing waste water to be treated is sent to the bottom of the air humidifying tower 1 through a liquid supplementing port so as to supplement the phenol-containing waste water evaporated into the air. The phenol-containing wet air from the top of the air humidifying tower 1 is fed into the incinerator 2, and the fuel is fed into the incinerator 2, wherein in the incinerator 2, the fuel reacts with the air to generate high-temperature flue gas, and the phenol is separated at high temperatureDecomposing and reacting with oxygen to produce CO2And H2And O. High-temperature flue gas generated by the incinerator 2 is discharged after being subjected to modes of steam generation, air preheating and the like, and hot water outside the system is used as a heat source of hot side circulating water of the phenol-containing wastewater/circulating water heat exchanger.
The heat source for evaporating the phenol-containing wastewater in the invention is heat provided by circulating water in the phenol-containing wastewater/circulating water heat exchanger 3. The typical temperature range of the circulating water is 40-150 ℃, the specific parameters of the circulating water depend on heat source parameters which can be obtained on the implementation site, for example, a large amount of low-grade heat below 150 ℃ exists in coal chemical engineering processes such as coal-to-oil and coal-to-methanol and the like and industrial processes such as refining and the like, the low-grade heat is difficult to be effectively utilized and is often required to be taken away by a cooling tower (air cooling or wet cooling), and the invention can utilize the low-grade heat to evaporate phenol-containing wastewater, thereby reducing the operation cost of the phenol-containing wastewater incineration treatment.
Example 2
As shown in fig. 2, in the present embodiment, the system for treating phenolic wastewater by pyrolysis includes, in addition to the air humidifying tower 1 and the incinerator 2, a flue gas washing tower 6, a flue gas inlet, a circulating water outlet and a condensed water drain outlet are arranged at the bottom of the flue gas washing tower 6, a flue gas outlet and a circulating water inlet are arranged at the top of the flue gas washing tower 6, the flue gas outlet of the incinerator 2 is communicated with the flue gas inlet at the bottom of the flue gas washing tower 6, the circulating water outlet at the bottom of the flue gas washing tower 6 is communicated with the circulating water inlet at the top of the flue gas washing tower 6 after passing through the circulating water pump 7 and the hot side of the phenolic wastewater/circulating water heat exchanger 3 in sequence through pipelines, the flue gas washed by the circulating water is discharged from the flue gas outlet at the top of the flue gas washing tower 6, and the water condensed from the flue gas during the washing process is discharged through the condensed water drain outlet at the bottom of the flue gas washing tower 6.
The method comprises the steps that ambient air enters an air humidifying tower 1 after being pressurized by a fan 4, the air flows upwards from the bottom in the air humidifying tower 1, hot phenol-containing wastewater flows downwards from the top, the air is heated and humidified in the process of flowing upwards from the bottom, and in the process of flowing downwards from the top, partial steam and phenol in the phenol-containing wastewater are evaporated into the air, the temperature of the phenol-containing wastewater is reduced, and then the phenol-containing wastewater flows downwards from the topThe air flows out from the bottom of the air humidifying tower 1. The phenol-containing wastewater flowing out of the bottom of the air humidifying tower 1 is pressurized by a phenol water circulating pump 5 and then sent to the cold side of a phenol-containing wastewater/circulating water heat exchanger 3, in the phenol-containing wastewater/circulating water heat exchanger 3, the phenol-containing wastewater is heated by circulating water, the phenol-containing wastewater is heated, and the circulating water is cooled. And sending the phenol-containing wastewater after the temperature rise to the top of the air humidifying tower 1. The new phenol-containing waste water to be treated is sent to the bottom of the air humidifying tower 1 to supplement the phenol-containing waste water evaporated into the air. The wet air containing phenol coming out from the top of the air humidifying tower 1 is sent into the incinerator 2, and the fuel is sent into the incinerator 2, in the incinerator 2, the fuel reacts with the air to generate high-temperature flue gas, meanwhile, the phenol decomposes at high temperature and reacts with oxygen to generate CO2And H2And O. The high-temperature flue gas generated by the incinerator 2 is discharged after being processed by modes of generating steam, preheating air and the like. The flue gas discharged from the incinerator is firstly introduced into the bottom of the flue gas washing tower 6, in the flue gas washing tower 6, the flue gas flows upwards from the bottom, cold circulating water enters from the top of the flue gas washing tower 6 and flows downwards from the top, the flue gas is cooled in the upwards flowing process, water vapor in the flue gas is partially condensed into water, the cold circulating water is in direct contact with the flue gas in the downwards flowing process from the top of the flue gas washing tower 6, and the cold circulating water is discharged from the bottom of the flue gas washing tower 6 after the temperature of the cold circulating water is increased. The hot circulating water discharged from the bottom of the flue gas washing tower 6 is sent to the phenol-containing wastewater/circulating water heat exchanger 3 after being pressurized by the circulating water pump 7, the phenol-containing wastewater is heated, and the circulating water is sent back to the top of the flue gas washing tower 6 after being cooled. At the bottom of the flue gas scrubber 6, the water condensed from the flue gas is discharged.
It should be noted that the incinerator 2 in this embodiment may be various types of equipment such as a boiler, a kiln, or a heating furnace that generates high-temperature flue gas by burning air and fuel, and the fuel in this embodiment may be various types of solid, liquid, or gas fuel such as coal, natural gas, liquefied petroleum gas, and syngas.
The air humidifying tower 1 and the flue gas washing tower 6 described in the present embodiment may be a packed tower or a hollow spray tower, and if the tower is a packed tower, the packing type may be structured packing or loose packing.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, but rather as the subject matter of any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention.
Claims (6)
1. A system for treating phenolic wastewater by pyrolysis at least comprises an air humidifying tower and an incinerator and is characterized in that,
the bottom of the air humidifying tower is at least provided with an air inlet, a phenolic wastewater replenishing port and a circulating phenolic wastewater outlet, the air inlet is used for introducing ambient air into the air humidifying tower, the phenolic wastewater replenishing port is used for replenishing new phenolic wastewater to be treated to the air humidifying tower,
the top of the air humidifying tower is at least provided with a circulating phenol-containing wastewater inlet and a phenol-containing wet air outlet, the circulating phenol-containing wastewater outlet is communicated with the circulating phenol-containing wastewater inlet after passing through at least one heater through a pipeline, the phenol-containing wet air outlet is communicated with the air inlet of the incinerator through a pipeline, and phenol vapor in the phenol-containing wet air is decomposed at high temperature and reacts with oxygen to generate CO in the incinerator2And H2O，
The system also comprises a flue gas washing tower, wherein a flue gas inlet, a circulating water outlet and a condensed water discharge port are arranged at the bottom of the flue gas washing tower, a smoke discharge port and a circulating water inlet are arranged at the top of the flue gas washing tower, the flue gas outlet of the incinerator is communicated with the flue gas inlet at the bottom of the flue gas washing tower, the circulating water outlet at the bottom of the flue gas washing tower passes through the hot side of the heater through a pipeline and then is communicated with the circulating water inlet at the top of the flue gas washing tower, the circulating phenol-containing wastewater at the cold side of the heater is heated, the flue gas washed by the circulating water is discharged from the smoke discharge port at the top of the flue gas washing tower, and the water condensed from the flue gas in the washing process is discharged through the condensed water discharge port at the bottom of the flue gas washing tower;
and when the concentration of the phenolic wastewater at the circulating phenolic wastewater outlet and/or the circulating phenolic wastewater inlet is higher than a set value, the control valve is opened, and new phenolic wastewater to be treated enters the air humidification tower through the phenolic wastewater replenishing port.
2. The system of claim 1, wherein a circulating pump is arranged on a communication pipeline between the circulating water outlet and/or the circulating water inlet of the flue gas washing tower.
3. The system of claim 1, wherein a booster fan is disposed in the air inlet duct of the air humidification tower.
4. The system of claim 1, wherein an air preheater is disposed on the air inlet pipeline of the air humidifying tower, and a heat source of the air preheater is high-temperature flue gas or high-temperature hot water generated by the incinerator.
5. The system of claim 1, wherein a circulating pump is further disposed on the phenol-containing wastewater circulating line between the phenol-containing wastewater circulating outlet and the phenol-containing wastewater circulating inlet.
6. A method for treating phenol-containing waste water by pyrolysis, which comprises using the system for treating phenol-containing waste water by pyrolysis according to any one of claims 1 to 5,
introducing ambient air into the air humidifying tower through an air inlet arranged at the bottom of the air humidifying tower; a phenol-containing wastewater circulating unit is formed by utilizing a circulating phenol-containing wastewater outlet arranged at the bottom of the air humidifying tower and a circulating phenol-containing wastewater inlet arranged at the top of the air humidifying tower, and the circulating phenol-containing wastewater is heated by a heater arranged on a communicating pipeline between the circulating phenol-containing wastewater outlet and the circulating phenol-containing wastewater inlet; supplementing new phenolic wastewater to be treated to the air humidifying tower by utilizing a phenolic wastewater supplementing port arranged at the bottom of the air humidifying tower;
the phenol-containing wet air generated by the air humidifying tower is introduced into the incinerator through a phenol-containing wet air outlet at the top of the air humidifying tower, and phenol vapor in the phenol-containing wet air is decomposed at high temperature and reacts with oxygen to generate CO in the incinerator2And H2O, the heat source of the heater is high-temperature flue gas generated by the incinerator;
the flue gas generated by the incinerator is introduced into the bottom of the flue gas washing tower, a circulating water outlet at the bottom of the flue gas washing tower passes through a hot side of the heater through a pipeline and then is communicated with a circulating water inlet at the top of the flue gas washing tower, so that the circulating phenol-containing wastewater at the cold side of the heater is heated, the flue gas washed by the circulating water is discharged from a smoke outlet at the top of the flue gas washing tower, and water condensed from the flue gas in the washing process is discharged from a condensed water discharge outlet at the bottom of the flue gas washing tower.
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| CN112299513A (en) * | 2020-11-06 | 2021-02-02 | 内蒙古万众炜业科技环保股份公司 | Ammonia distillation and dephenolization coupling device and process for wastewater for semi-coke production |
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| CN101255363A (en) * | 2007-03-03 | 2008-09-03 | 淄博义丰机械工程有限公司 | Coal-gas producer phenolic water high-temperature treating device and treating process |
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| CN1059165A (en) * | 1991-04-01 | 1992-03-04 | 陈绍维 | Secondary reformer gas station phenol water treatment technique and device |
| CN101255363A (en) * | 2007-03-03 | 2008-09-03 | 淄博义丰机械工程有限公司 | Coal-gas producer phenolic water high-temperature treating device and treating process |
| CA2842372A1 (en) * | 2011-07-21 | 2013-01-24 | Pureteq A/S | Method and system for removal of dissolved organic compounds in process water |
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