CN214106419U - Flue gas water purification recovery unit - Google Patents
Flue gas water purification recovery unit Download PDFInfo
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- CN214106419U CN214106419U CN202021831052.0U CN202021831052U CN214106419U CN 214106419 U CN214106419 U CN 214106419U CN 202021831052 U CN202021831052 U CN 202021831052U CN 214106419 U CN214106419 U CN 214106419U
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Abstract
The utility model discloses a flue gas water purification and recovery device, which comprises a flue gas deacidification system, a flue gas cooling and dedusting system, a vacuum flash evaporation condensing system and a flue gas condensate water recovery system; the flue gas deacidification system comprises a deacidification tower, an atomizer and an emergency water supply tank; the flue gas cooling and dedusting system comprises a washing tower, a flash tank and a washing water pump; the vacuum flash evaporation condensing system comprises a first air cooler, a first gas-liquid separator, a water ring vacuum pump, a second gas-liquid separator and a first recovery water pump; the flue gas condensate water recovery system comprises a second air cooler, a third gas-liquid separator and a second recovery water pump. The utility model discloses a flue gas water purification recovery unit has that the deacidification dust collection efficiency is high, the fume emission total amount is few, can effectively retrieve advantages such as water in the flue gas, and the emission total amount of the flue gas after the device handles can reduce more than 30%, and the retrieval and utilization water purification of retrieving in the flue gas can reach more than 75%.
Description
Technical Field
The utility model relates to a water recycle technical field after fatlute pyrolysis treatment, concretely relates to flue gas water purification recovery unit.
Background
The oily sludge is a mixture of various forms of the product oil mixed into soil or other media, wherein the oil component cannot be directly recovered and can cause pollution. In order to recover oil contained in the oil-containing sludge, most of the prior processes adopt an oil sludge water washing process, wherein the oil contained in the oil sludge is recycled, and the oil sludge after water washing is subjected to direct contact pyrolysis to meet the requirement of environmental protection. In the pyrolysis process of the oil sludge, a large amount of moisture is discharged along with the flue gas after pyrolysis, and the flue gas containing a large amount of moisture is directly discharged to the environment in a gas phase mode after being subjected to desulfurization, denitrification, dedusting and purification.
The direct emission of the above fumes in the gaseous phase has several drawbacks:
(1) in view of economy and efficiency, the directly discharged flue gas contains dust and part of acidic substances.
(2) The total amount of directly discharged flue gas is large, and the control on the total amount of discharged pollutants is unfavorable.
(3) A large amount of water is directly discharged along with the smoke, which is unfavorable for the recovery and utilization of water resources, especially in the areas with water shortage and rain shortage, the recovery and utilization of the water resources are precious.
Therefore, the purification and recycling of the water in the flue gas have important practical significance in view of environmental factors or social development factors.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a flue gas water purification and recovery device solves the above-mentioned traditional problem, and it can retrieve the water in the flue gas in a large number to carry out effective treatment to the flue gas, thereby reduce the total emission of flue gas and pollutant.
The utility model discloses a following technical scheme realizes:
a flue gas water purification and recovery device comprises a flue gas deacidification system, a flue gas cooling and dedusting system connected with the flue gas deacidification system, a vacuum flash evaporation and condensation system connected with the flue gas cooling and dedusting system and a flue gas condensate water recovery system;
the flue gas deacidification system comprises a deacidification tower, an atomizer arranged at the top of the deacidification tower and an emergency water feeding tank connected with an emergency water feeding port at the upper end of the deacidification tower; the deacidification tower is provided with a hot flue gas inlet at the upper end part and a flue gas outlet at the lower end part;
the flue gas cooling and dedusting system comprises a washing tower, a flash tank connected with the bottom of the washing tower and a washing water pump connected with a liquid phase outlet of the flash tank; the gas inlet of the washing tower is connected with the flue gas outlet, and the outlet of the washing water pump is connected with the upper end part of the washing tower;
the vacuum flash evaporation condensing system comprises a first air cooler, a first gas-liquid separator connected with the first air cooler, a water ring vacuum pump connected with a gas-phase outlet of the first gas-liquid separator, a second gas-liquid separator connected with an outlet of the water ring vacuum pump, and a first recovery water pump connected with a liquid-phase outlet of the first gas-liquid separator; an inlet of the first air cooler is connected with a gas-phase outlet of the flash tank, and the first recovery water pump is used for conveying the recycled purified water in the first gas-liquid separator;
the flue gas condensate water recovery system comprises a second air cooler, a third gas-liquid separator connected with the second air cooler and a second recovery water pump connected with a liquid phase outlet of the third gas-liquid separator; and the inlet of the second air cooler is connected with the top of the washing tower, and the second recovery water pump is used for conveying the recycled purified water in the third gas-liquid separator.
Preferably, the flue gas flow direction of the hot flue gas inlet is perpendicular to the liquid flow direction of the atomizer.
Preferably, the atomizer includes the spray gun, with alkali lye feed liquor pipe and atomizing air gas-supply pipe that the spray gun links to each other, alkali lye feed liquor pipe with atomizing air gas-supply pipe is connected respectively on the spray gun, atomizing air gas-supply pipe be used for with alkali lye feed liquor pipe comes the alkali lye atomizes.
Preferably, the emergency water supply tank is provided with a water input pipe and a compressed air input pipe, the compressed air input pipe is connected to the top of the emergency water supply tank, and the water input pipe is connected to the side of the emergency water supply tank.
Preferably, the washing column is a packed column or a tray column.
Preferably, the outlet of the washing water pump is also provided with a dust-containing water recycling pipe.
Preferably, the outlet of the first recovery water pump is further provided with a purified water return pipe connected with a circulating water inlet pipeline of the water ring vacuum pump.
Preferably, the flue gas water purification recovery unit still include with the flue gas discharge system that the gas phase export of third vapour and liquid separator links to each other, flue gas discharge system include flue gas draught fan and with the chimney that the flue gas draught fan links to each other, the draught fan be used for with the flue gas of separation takes out and send into in the third vapour and liquid separator carry out high altitude in the chimney and discharge.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model discloses a flue gas water purification recovery unit has that the deacidification dust collection efficiency is high, the fume emission total amount is few, can effectively retrieve advantages such as water in the flue gas, and the emission total amount of the flue gas after the device handles can reduce more than 30% (v), and the retrieval and utilization water purification of retrieving in the flue gas can reach more than 75%.
Drawings
Fig. 1 is a process flow chart of the flue gas water purification and recovery device of the utility model.
In the figure: 11. a deacidification tower; 110. a hot flue gas inlet; 111. a flue gas outlet; 120. a spray gun; 121. an alkali liquor inlet pipe; 122. an atomized air delivery pipe; 13. an emergency water supply tank; 131. a water input pipe; 132. a compressed air input pipe; 21. a washing tower; 22. a flash tank; 23. washing the water pump; 230. a dirty water recycling pipe; 31. a first air cooler; 32. a first gas-liquid separator; 33. a water ring vacuum pump; 34. a second gas-liquid separator; 35. a first recovery water pump; 350. a purified water return pipe; 41. a second air cooler; 42. a third gas-liquid separator; 43. a second recovery water pump; 51. a flue gas induced draft fan; 52. and (4) a chimney.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific embodiments:
please refer to fig. 1, which is the utility model discloses a flue gas water purification and recovery device, which is particularly suitable for water purification and recovery in the sludge pyrolysis flue gas after the sludge water washing, and can effectively treat and recycle water in the hot flue gas after the sludge pyrolysis.
The flue gas water purification and recovery device comprises a flue gas deacidification system, a flue gas cooling and dedusting system connected with the flue gas deacidification system, a vacuum flash evaporation and condensation system connected with the flue gas cooling and dedusting system, a flue gas condensate water recovery system and a flue gas discharge system connected with the flue gas condensate water recovery system;
specifically, the flue gas deacidification system comprises a deacidification tower 11, an atomizer arranged at the top of the deacidification tower 11 and an emergency water feeding tank 13 connected with an emergency water feeding port at the upper end of the deacidification tower 11; the deacidification tower 11 is provided with a hot flue gas inlet 110 at the upper end part and a flue gas outlet 111 at the lower end part, the hot flue gas inlet 110 is used for being communicated with a hot flue gas pipeline, and the deacidification tower 11 mainly has the functions of cooling and deacidification and ensures that the subsequent processes can stably run. The atomizer is used for providing atomizing alkali lye to deacidify the flue gas, wherein, hot flue gas entry 110 the flue gas flow direction with the liquid flow direction of atomizer is perpendicular setting, so that atomizing alkali lye can the intensive mixing with the flue gas. In one embodiment, the atomizer includes a spray gun 120, an alkali liquor inlet pipe 121 connected to the spray gun 120, and an atomizing air delivery pipe 122, where the alkali liquor inlet pipe 121 and the atomizing air delivery pipe 122 are respectively connected to the spray gun 120, and the atomizing air delivery pipe 122 is used to atomize alkali liquor from the alkali liquor inlet pipe 121, so that the atomized alkali liquor is better contacted with acidic substances in flue gas. The bottom of the deacidification tower 11 is provided with an ash discharge pipe for discharging ash in the tower.
In one embodiment, the emergency water supply tank 13 is used for supplying atomized water to the deacidification tower 11 in an emergency, so that the temperature of the flue gas is reduced, and the flue gas is prevented from being over-heated when the atomizer fails. The emergency water supply tank 13 is provided with a water input pipe 131 and a compressed air input pipe 132, the compressed air input pipe 132 is connected to the top of the emergency water supply tank 13, and the water input pipe 131 is connected to the side of the emergency water supply tank 13.
The flue gas cooling and dedusting system mainly has the functions of humidifying, cooling, dedusting and deacidifying. Specifically, the flue gas cooling and dedusting system comprises a washing tower 21, a flash tank 22 connected with the bottom of the washing tower 21, and a washing water pump 23 connected with a liquid phase outlet of the flash tank 22; the gas inlet of the washing tower 21 is connected with the flue gas outlet 111 of the deacidification tower 11, and the outlet of the washing water pump 23 is connected with the upper end part of the washing tower 21, so that an internal water circulation is formed. The internals of the scrubber 21 are of a packing or plate type, and the scrubber 21 is made of metal or nonmetal material resistant to chloride ions, and in one embodiment, the scrubber 21 is a packed tower or a plate tower.
The flash tank 22 is used for performing vacuum flash evaporation on the material from the bottom of the washing tower 21, and is used for reducing the temperature of the material and flashing clean water vapor. The washing water pump 23 is used for pumping the water after the temperature reduction by flash evaporation into the washing tower 21 as washing water, and for pumping the dust-containing water after the flash evaporation back to the oil sludge pyrolysis process to be used as conditioning water for the dry soil after pyrolysis. In one embodiment, the outlet of the washing water pump 23 is further provided with a dust-containing water recycling pipe 230.
The vacuum flash condensing system is used for condensing and recovering the water vapor flashed by the flash tank 22 and providing a high vacuum environment for the flash tank 22, thereby facilitating the flash tank 22 to flash clean water vapor and reduce the temperature. Specifically, the vacuum flash condensation system comprises a first air cooler 31, a first gas-liquid separator 32 connected with the first air cooler 31, a water ring vacuum pump 33 connected with a gas-phase outlet of the first gas-liquid separator 32, a second gas-liquid separator 34 connected with an outlet of the water ring vacuum pump 33, and a first recovered water pump 35 connected with a liquid-phase outlet of the first gas-liquid separator 32; an inlet of the first air cooler 31 is connected with a gas-phase outlet of the flash tank 22, the first air cooler 31 uses air as a refrigerant, and a natural cooling or forced cooling mode is adopted to condense the vapor phase flashed out from the flash tank 22 and recover clean water therein. The first recovery water pump 35 is used for conveying the recycled purified water in the first gas-liquid separator 32 to the whole plant for public use. In one embodiment, the outlet of the first recycling water pump 35 is further provided with a clean water return pipe 350 connected to the circulating water inlet pipeline of the water ring vacuum pump 33 to supplement the water for the water ring vacuum pump 33. The top of the second gas-liquid separator 34 is connected to the atmosphere, i.e., the vapor phase is subjected to gas-liquid separation again by the second gas-liquid separator 34, and the separated non-condensable gas is directly discharged to the atmosphere.
The flue gas condensate water recovery system is used for performing condensation flash evaporation on flue gas subjected to washing and dust removal by the washing tower 21, and specifically comprises a second air cooler 41, a third gas-liquid separator 42 connected with the second air cooler 41, and a second recovery water pump 43 connected with a liquid phase outlet of the third gas-liquid separator 42; the second recovery water pump 43 is used for conveying the recycled purified water in the third gas-liquid separator 42 to the whole plant for public use. The second air cooler 41 uses air as a cooling medium, and condenses the gas phase coming out of the top of the washing tower 21 by natural cooling or forced cooling and recovers clean water therein.
The flue gas discharge system is used for discharging flue gas after gas-liquid separation of the third gas-liquid separator 42, and comprises a flue gas induced draft fan 51 and a chimney 52 connected with the flue gas induced draft fan 51, the induced draft fan is used for extracting flue gas separated out from the third gas-liquid separator 42 and sending the flue gas into the chimney 52 for high-altitude discharge, so that the purified flue gas in the system can be rapidly discharged outwards.
In one embodiment, the temperature of the flue gas outlet 111 of the deacidification tower 11 is below 200 ℃; the temperature of the flue gas outlet 111 of the washing tower 21 is between 60 ℃ and 90 ℃, the operation pressure is micro negative pressure, and in one embodiment, the operation pressure of the washing tower 21 is-90 KPa to-70 KPa; the outlet temperature of the washing water pump 23 is between 40 and 60 ℃; the outlet temperature of the first air cooler 31 and the second air cooler 41 is between 40 and 60 ℃; the vacuum degree of the first gas-liquid separator 32 is between-90 KPa and-70 KPa.
The working principle of the flue gas water purification and recovery device is as follows: the hot flue gas enters a washing tower 21 after being deacidified and cooled by a deacidification tower 11, is continuously cooled in the washing tower 21 and is dedusted; after further temperature reduction and dust removal, the flue gas from the top of the washing tower 21 is continuously cooled to 40-60 ℃ by a second air cooler 41 and then is separated by a third gas-liquid separator 42, the separated flue gas is sent to a chimney 52 by a flue gas induced draft fan 51 to be discharged at high altitude, and the separated recycled purified water is pumped to the whole plant by a second recycle water pump 43 to be used as recycled water; after the dust-containing washing water from the bottom of the washing tower 21 is subjected to vacuum flash evaporation and temperature reduction, the flash evaporation water is pumped into the washing tower 21 by a washing water pump 23 to be used as circulating washing water, and the surplus part is pumped back to an oil sludge pyrolysis process to be used as conditioning water for pyrolyzing clean soil; the flash steam is condensed by a first air cooler 31, purified water is separated by a first gas-liquid separator 32 and is used for the public of a whole plant for recycling purified water, and non-condensable gas is pumped out by a water ring vacuum pump 33 and is directly discharged.
The flue gas water purification and recovery device has the advantages of high deacidification and dust removal efficiency, less total flue gas emission amount, capability of effectively recovering water in flue gas and the like, the total emission amount of the flue gas treated by the device can be reduced by more than 30% (v), and the recycled and reused purified water recovered from the flue gas can reach more than 75%.
The flue gas water purification and recovery process comprises the following steps:
s1: deacidifying the hot flue gas by a deacidification tower 11, cooling to below 200 ℃, then entering a washing tower 21, continuously cooling to 60-90 ℃ under the condition of micro negative pressure (-90KPa to-70 KPa), and simultaneously washing and dedusting;
s2: the dust-containing washing water from the bottom of the washing tower 21 is subjected to flash evaporation and temperature reduction to 40-60 ℃ through a flash evaporation tank 22, and is divided into tower bottom flash evaporation liquid and tower top flash evaporation steam; the flash liquid at the bottom of the tower is conveyed to the upper end part of the washing tower 21 through a washing water pump 23 and is used as washing cooling water; the overhead flash steam is condensed by a first air cooler 31 and enters a first gas-liquid separator 32 for gas-liquid separation, the separated non-condensable gas is discharged by a water ring vacuum pump 33 and then discharged, and the separated flash liquid is pumped back to the public of the whole plant by a first recovery water pump 35;
s3: the flue gas after being cooled and dedusted by the washing tower 21 enters a second air cooler 41, the temperature is continuously reduced to 40-60 ℃, then the flue gas and condensed water are separated by a third gas-liquid separator 42, and the separated condensed water is pumped back to the whole plant for public use by a second recovery water pump 43; the separated flue gas is sent to a chimney 52 through a flue gas induced draft fan 51 for high-altitude emission.
The flue gas water purification and recovery process has the following beneficial effects:
(1) the process can effectively reduce the total emission of the flue gas, thereby reducing the secondary pollution of the environment.
(2) The washing tower 21 of the process adopts a water washing mode to cool and remove dust, so that on one hand, the dust removal efficiency can be obviously improved, and on the other hand, certain land resources can be saved compared with the occupied area of other dust removal equipment (such as a bag-type dust remover and the like).
(3) The process adopts the recovered water as the spray water of the washing tower 21, and can effectively save water resources.
(4) The process adopts an air cooling mode to cool the hot fluid, so that the operation cost of the device can be obviously reduced, and the enterprise benefit is increased.
(5) The recycled clean water recovered by the process can reach more than 75% of water content in the flue gas, and the recovered water can be directly used as the make-up water of the whole plant, so that on one hand, water resources are effectively recycled, the operating cost of enterprises is reduced, and on the other hand, the secondary pollution to the environment is reduced, therefore, the process has good economic and social benefits.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes are intended to fall within the scope of the claims.
Claims (8)
1. A flue gas water purification and recovery device is characterized by comprising a flue gas deacidification system, a flue gas cooling and dedusting system connected with the flue gas deacidification system, a vacuum flash evaporation and condensation system connected with the flue gas cooling and dedusting system and a flue gas condensate water recovery system;
the flue gas deacidification system comprises a deacidification tower, an atomizer arranged at the top of the deacidification tower and an emergency water feeding tank connected with an emergency water feeding port at the upper end of the deacidification tower; the deacidification tower is provided with a hot flue gas inlet at the upper end part and a flue gas outlet at the lower end part;
the flue gas cooling and dedusting system comprises a washing tower, a flash tank connected with the bottom of the washing tower and a washing water pump connected with a liquid phase outlet of the flash tank; the gas inlet of the washing tower is connected with the flue gas outlet, and the outlet of the washing water pump is connected with the upper end part of the washing tower;
the vacuum flash evaporation condensing system comprises a first air cooler, a first gas-liquid separator connected with the first air cooler, a water ring vacuum pump connected with a gas-phase outlet of the first gas-liquid separator, a second gas-liquid separator connected with an outlet of the water ring vacuum pump, and a first recovery water pump connected with a liquid-phase outlet of the first gas-liquid separator; an inlet of the first air cooler is connected with a gas-phase outlet of the flash tank, and the first recovery water pump is used for conveying the recycled purified water in the first gas-liquid separator;
the flue gas condensate water recovery system comprises a second air cooler, a third gas-liquid separator connected with the second air cooler and a second recovery water pump connected with a liquid phase outlet of the third gas-liquid separator; and the inlet of the second air cooler is connected with the top of the washing tower, and the second recovery water pump is used for conveying the recycled purified water in the third gas-liquid separator.
2. The flue gas water purification and recovery device of claim 1, wherein the flue gas flow direction of the hot flue gas inlet is perpendicular to the liquid flow direction of the atomizer.
3. The flue gas water purification and recovery device as claimed in claim 2, wherein the atomizer comprises a spray gun, an alkali liquor inlet pipe and an atomization air delivery pipe, the alkali liquor inlet pipe and the atomization air delivery pipe are connected to the spray gun respectively, and the atomization air delivery pipe is used for atomizing alkali liquor from the alkali liquor inlet pipe.
4. The flue gas water purification and recovery device as claimed in claim 1, wherein the emergency water supply tank is provided with a compressed air input pipe and a water input pipe, the compressed air input pipe is connected to the top of the emergency water supply tank, and the water input pipe is connected to the side of the emergency water supply tank.
5. The flue gas water purification and recovery device of claim 1, wherein the scrubbing tower is a packed tower or a tray tower.
6. The flue gas water purification and recovery device of claim 1, wherein the outlet of the washing water pump is further provided with a dust-containing water recycling pipe.
7. The flue gas water purification and recovery device as claimed in claim 1, wherein the outlet of the first recovery water pump is further provided with a purified water return pipe connected with a circulating water inlet pipeline of the water ring vacuum pump.
8. The flue gas water purification and recovery device of claim 1, further comprising a flue gas discharge system connected with a gas phase outlet of the third gas-liquid separator, wherein the flue gas discharge system comprises a flue gas induced draft fan and a chimney connected with the flue gas induced draft fan, and the induced draft fan is used for extracting the flue gas separated from the third gas-liquid separator and sending the flue gas into the chimney for high-altitude discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021831052.0U CN214106419U (en) | 2020-08-27 | 2020-08-27 | Flue gas water purification recovery unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021831052.0U CN214106419U (en) | 2020-08-27 | 2020-08-27 | Flue gas water purification recovery unit |
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| CN214106419U true CN214106419U (en) | 2021-09-03 |
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| CN202021831052.0U Active CN214106419U (en) | 2020-08-27 | 2020-08-27 | Flue gas water purification recovery unit |
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