CN217808827U - Alkali waste evaporation waste heat utilization system for cyclohexanone production - Google Patents
Alkali waste evaporation waste heat utilization system for cyclohexanone production Download PDFInfo
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- CN217808827U CN217808827U CN202222151952.6U CN202222151952U CN217808827U CN 217808827 U CN217808827 U CN 217808827U CN 202222151952 U CN202222151952 U CN 202222151952U CN 217808827 U CN217808827 U CN 217808827U
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Abstract
The embodiment of the utility model provides a cyclohexanone production alkali waste evaporation waste heat utilization system belongs to sewage treatment technical field. This alkali waste evaporation waste heat utilization system includes: a spent caustic separator; the high-pressure steam port of the steam jet pump is connected with the gas phase outlet of the spent caustic separator; the gas-liquid inlet of the gas-liquid separation tank is connected with the mixed steam port of the steam jet pump; a steam inlet of the wastewater stripping tower is connected with a gas phase outlet of the gas-liquid separation tank; and the gas inlet of the gas condenser is connected with the steam outlet of the wastewater stripping tower, and the gas outlet of the gas condenser is connected with the low-pressure steam port of the steam jet pump. This alkali waste evaporation waste heat utilization system has reduced the steam use amount of waste water stripper, and has solved the problem that alkali waste separator outlet pipe pressure builds pressure, has eliminated the potential safety hazard.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment, especially, relate to a cyclohexanone production alkali waste evaporation waste heat utilization system.
Background
The cyclohexanone device is a device which produces cyclohexyl hydrogen peroxide by using liquid phase cyclohexane to react with oxygen in the air, then 32% sodium hydroxide solution is used to provide an alkaline environment, the cyclohexyl hydrogen peroxide is directionally decomposed into a mixture of cyclohexanone and cyclohexanol, and saponification lye (solid content is about 22%) is produced while the cyclohexyl hydrogen peroxide is decomposed. Removing a part of water and an organic phase from saponified alkali liquor through a waste alkali flash tank, enabling the rest saponified alkali liquor to enter a waste alkali evaporator, enabling the waste alkali evaporator to utilize 0.4Mpa steam 3.5t/h as a heat source, heating and vaporizing the organic phase and water in the saponified alkali liquor, enabling a generated gas phase to enter a condenser for condensation, enabling a condensed liquid phase to be separated in a separator, enabling the separated organic phase to enter a refining mixer, enabling separated wastewater and waste water evaporated from waste alkali evaporation to enter a waste water stripping tower together for stripping, and removing the organic phase, wherein the waste water stripping tower needs to utilize 0.4Mpa steam 3t/h as the heat source to treat the waste water, and the steam consumption is high.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned problem that prior art exists, the embodiment of the utility model provides an aim at provides an alkali evaporation waste heat utilization system is used to cyclohexanone production waste.
The embodiment of the utility model provides a technical scheme who adopts is:
the utility model provides a cyclohexanone production alkali waste evaporation waste heat utilization system, includes:
a spent caustic separator;
the high-pressure steam port of the steam jet pump is connected with the gas phase outlet of the spent caustic soda separator;
a gas-liquid inlet of the gas-liquid separation tank is connected with a mixed steam port of the steam jet pump;
a steam inlet of the wastewater stripping tower is connected with a gas phase outlet of the gas-liquid separation tank;
the gas condenser, gas condenser's air inlet with the steam outlet of waste water stripper is connected, gas condenser's gas outlet with the low pressure steam port of steam jet pump is connected.
Further, be equipped with the vertical exhaust person in charge that places in the middle of the packing layer bottom of waste water strip tower's inside, the circumference that the exhaust was responsible for is connected with a plurality of exhaust and is in charge, every be equipped with a plurality of gas vents on the exhaust is in charge, the bottom that the exhaust was responsible for with waste water strip tower's steam inlet is connected, so that enter into steam in the waste water strip tower can enter into in the exhaust main pipe, and follow every the gas vent of exhaust branch pipe is discharged and is passed the packing layer.
Further, a plurality of the exhaust branch pipes are perpendicular to the main pipe.
Further, it is a plurality of exhaust branch is connected respectively to the gas vent, exhaust branch's axis with contained angle between the axis of exhaust branch pipe is the acute angle, just exhaust branch by with the one end that the gas vent is connected extremely the free end of exhaust branch pipe is kept away from gradually the exhaust is responsible for to make a plurality of exhaust branch pipe on the gas of exhaust branch pipe exhalant wholly be rotatory and rise.
Furthermore, the main exhaust pipe is an L-shaped pipe, a pipe opening of a horizontal pipe section of the L-shaped pipe is connected with a steam inlet of the wastewater stripping tower and is fixed on the inner wall of the wastewater stripping tower, and the plurality of branch exhaust pipes are arranged on the outer peripheral wall of a vertical pipe section of the L-shaped pipe.
Further, the liquid phase outlet of the gas-liquid separation tank and the liquid outlet of the gas condenser are both connected with an organic matter separator for recovering organic matters.
Further, a wastewater outlet of the wastewater stripping tower is connected with a biochemical pool.
Further, a liquid phase outlet at the bottom of the waste alkali separator is connected with an alkali furnace and is used for feeding liquid separated by the waste alkali evaporator into the alkali furnace for combustion.
Compared with the prior art, the embodiment of the utility model has the advantages that,
the embodiment of the utility model provides a cyclohexanone production alkali waste evaporation waste heat utilization system is direct to introduce the steam jet pump as the power heat source with the gaseous phase that contains organic matter and water that the alkali waste separator produced, after the steam jet pump uses, gaseous phase pressure descends, and enter into the gas-liquid separation jar with the waste water gaseous phase that the waste water strip tower taken out by the steam jet pump and carry out gas-liquid separation together, the gaseous phase after the separation enters into in the waste water strip tower, thereby carry out the heat exchange with waste water and retrieve the heat in the gaseous phase, the steam use amount of waste water strip tower has been reduced, and the problem of alkali waste separator outlet pipe pressure suppressing pressure has been solved, the potential safety hazard has been eliminated.
Drawings
FIG. 1 is a schematic structural diagram of an evaporation waste heat utilization system for producing spent caustic soda from cyclohexanone according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an exhaust main pipe according to an embodiment of the present invention.
Reference numerals are as follows:
1-waste alkali separator, 2-steam jet pump, 3-gas-liquid separator, 4-waste water stripping tower, 5-first gas condenser, 6-second gas condenser, 7-organic matter separator, 8-biochemical pool, 9-main exhaust pipe, 10-branch exhaust pipe and 11-branch exhaust pipe.
Detailed Description
To maintain the following description of the embodiments of the present invention clear and concise, detailed descriptions of well-known functions and components may be omitted.
The embodiment of the utility model provides a cyclohexanone production alkali waste evaporation waste heat utilization system, this alkali waste evaporation waste heat utilization system includes:
the waste alkali separator 1 is used for heating saponified liquid generated in the production process of cyclohexanone, so that organic matters and water in the saponified liquid are heated and vaporized, and are discharged through a gas phase outlet of the waste alkali separator 1;
the high-pressure steam port of the steam jet pump 2 is connected with the gas phase outlet of the spent caustic soda separator 1 and is used for taking the gas phase discharged by the spent caustic soda separator 1 as a power source;
a gas-liquid inlet of the gas-liquid separator 3 is connected with a mixed steam port of the steam jet pump 2 and is used for carrying out gas-liquid separation on the mixed steam from the steam jet pump 2;
a steam inlet of the wastewater stripping tower 4 is connected with a gas phase outlet of the gas-liquid separator 3 and is used for exchanging heat between steam separated by the gas-liquid separator 3 and wastewater in the wastewater stripping tower 4;
and the gas inlet of the gas condenser is connected with the steam outlet of the wastewater stripping tower 4, the gas outlet of the gas condenser is connected with the low-pressure steam port of the steam jet pump 2, and the gas condenser is used for condensing the steam which is fractionated by the wastewater stripping tower 4 and contains organic matters, and the uncondensed steam is sucked into the gas condenser by the steam jet pump 2 and is mixed with the gas discharged from the waste alkali separator 1.
The embodiment of the utility model provides a cyclohexanone production waste alkali evaporation waste heat utilization system is direct to introduce steam jet pump 2 as the power heat source with the gaseous phase that contains organic matter and water that waste alkali separator 1 produced, gaseous phase pressure descends after steam jet pump 2 uses, and mix together with the steam that 2 absorptive follow waste water stripping tower 4 fractionations of steam jet pump and do not condensed and enter into vapour and liquid separator 3 and carry out gas-liquid separation, steam after the separation enters into waste water stripping tower 4 in, carry out the heat exchange with waste water, retrieve the heat in the steam, thereby reduce waste water stripping tower 4's steam use amount, and the pressure of having solved waste alkali separator gas phase outlet suppresses the problem of pressure, the potential safety hazard has been eliminated.
In some embodiments, a distributor is connected to the steam inlet of wastewater stripper 4, and is disposed below the packing layer in wastewater stripper 4 to allow steam entering into wastewater stripper 4 to uniformly pass through the packing layer. As shown in fig. 2, the distributor comprises a vertically-arranged main exhaust pipe 9, the main exhaust pipe 9 is located in the middle position below the bottommost packing layer in the wastewater stripping tower 4, three branch exhaust pipes 10 are connected to the peripheral wall of the top of the main exhaust pipe 9, three exhaust ports are respectively arranged on each branch exhaust pipe 10, the bottom of the main exhaust pipe 9 is connected with the steam inlet of the wastewater stripping tower 4, the top of the main exhaust pipe is sealed, steam entering the wastewater stripping tower 4 directly enters the main exhaust pipe 9, the steam is discharged through the exhaust ports on each branch exhaust pipe 10 and penetrates through the packing layer at the top of the main exhaust pipe 10, and therefore heat transfer is performed with wastewater.
As shown in fig. 2, in some embodiments, the exhaust port of each exhaust branch pipe 10 is connected to one exhaust branch pipe 11, the included angle between the axis of the exhaust branch pipe 11 and the axis of the exhaust branch pipe 10 is an acute angle, and the exhaust branch pipe 11 is gradually far away from the main exhaust pipe 9 from the end where it is connected to the exhaust branch pipe 10 to the free end thereof, so that the pipe orifice of the exhaust branch pipe 11 faces the obliquely upper part of the main exhaust pipe 9, and thus the gas exhausted through the obliquely arranged exhaust branch pipes 11 spirally rises, thereby increasing the contact area with the wastewater flowing into the wastewater stripper 4, prolonging the contact time, and improving the utilization rate of the steam.
Of course, it is easy to know that the number of the exhaust branch pipes 10 on the main exhaust pipe 9 is not limited to three in the present embodiment, and may be more than three, and the specific number may be determined according to the overall size or the internal space of the wastewater stripper 4.
A gas condenser is connected to the top of the general wastewater stripper 4 to condense organic matter-containing steam discharged from the wastewater stripper 4 to recover organic matter in the steam. As shown in fig. 1, the gas condenser includes a first gas condenser 4 and a second gas condenser 5 connected in series. The air inlet of the first gas condenser 4 is connected with the steam outlet of the wastewater stripping tower 4, the air outlet of the second gas condenser 5 is connected with the low-pressure steam port of the steam jet pump 2, so that high-speed airflow generated when the high-pressure steam port of the steam jet pump 2 is introduced into high-pressure steam can generate negative pressure at the low-pressure steam port of the steam jet pump 2, and the interior of the second gas condenser 5, the first gas condenser 4 and the wastewater stripping tower 4 which are sequentially connected is pumped into a micro-negative pressure state. On one hand, the steam jet pump 2 can directly pump the uncondensed steam in the two gas condensers into the interior of the two gas condensers to be mixed with the gas phase discharged from the waste alkali separator 1 and discharged into the gas-liquid separator 3 for reuse; on the other hand, the interior of the wastewater stripping tower 4 is pumped into a micro-negative pressure state, the pressure in the gas-liquid separator 3 cannot be increased, meanwhile, in the negative pressure state, the boiling point of organic matters in the wastewater is reduced, the organic matters are easier to evaporate, the steam usage is saved, and finally the COD (chemical oxygen demand) index in the wastewater is below 2000ppm and reaches the discharge standard.
Further, a wastewater outlet of the wastewater stripping tower in this embodiment is connected to the biochemical pool 8 for collecting wastewater discharged from the wastewater stripping tower 4.
As shown in fig. 1, the liquid outlets of the first gas condenser 4 and the second gas condenser 5 and the liquid phase outlet of the gas-liquid separator 3 in this embodiment are connected to an organic matter separator 7, and continue to separate to recover organic matter.
As shown in fig. 1, the liquid phase outlet of the spent caustic soda separator 1 in this embodiment is connected to the caustic soda furnace, and the gas phase outlet at the top of the tower in the spent caustic soda separator 1 is connected to the high pressure steam port of the steam jet pump 2, so that the spent caustic soda separator 1 can use 0.4Mpa steam 5t/h as the heat source to heat and vaporize the organic phase and water in the internal saponified solution, thereby concentrating the solid content in the saponified solution to 45%, and finally sending the concentrated solid content to the caustic soda furnace for combustion and incineration.
The above description is intended to be illustrative, and not restrictive, and one of ordinary skill in the art may effect alterations, modifications, substitutions, and variations to the above described embodiments while remaining within the scope of the present disclosure. Also, the above-described examples (or one or more versions thereof) may be used in combination with each other, and it is contemplated that the embodiments may be combined with each other in various combinations or permutations.
Claims (8)
1. The utility model provides a cyclohexanone production alkali waste evaporation waste heat utilization system which characterized in that includes:
a spent caustic separator;
the high-pressure steam port of the steam jet pump is connected with the gas phase outlet of the spent caustic soda separator;
a gas-liquid inlet of the gas-liquid separation tank is connected with a mixed steam port of the steam jet pump;
a steam inlet of the wastewater stripping tower is connected with a gas phase outlet of the gas-liquid separation tank;
the gas condenser, gas condenser's air inlet with the steam outlet of waste water stripper is connected, gas condenser's gas outlet with the low pressure steam port of steam jet pump is connected.
2. The system for utilizing waste heat from evaporation of alkali waste in cyclohexanone production according to claim 1, wherein a main exhaust pipe is vertically disposed in the middle of the bottom of the packing layer inside the wastewater stripping tower, a plurality of branch exhaust pipes are circumferentially connected to the main exhaust pipe, each branch exhaust pipe is provided with a plurality of exhaust ports, and the bottom of the main exhaust pipe is connected to a steam inlet of the wastewater stripping tower, so that steam entering the wastewater stripping tower can enter the main exhaust pipe, and is discharged from the exhaust ports of the branch exhaust pipes and passes through the packing layer.
3. The system for utilizing the evaporation waste heat of the alkali waste from cyclohexanone production as claimed in claim 2, wherein a plurality of the exhaust branch pipes are perpendicular to the exhaust main pipe.
4. The system for utilizing waste alkali evaporation and waste heat in cyclohexanone production according to claim 2, wherein the plurality of exhaust ports are respectively connected with an exhaust branch pipe, an included angle between an axis of the exhaust branch pipe and an axis of the exhaust branch pipe is an acute angle, and the exhaust branch pipe is gradually away from the exhaust main pipe from one end connected with the exhaust port to a free end of the exhaust branch pipe, so that the gas exhausted from the exhaust branch pipes on the plurality of exhaust branch pipes integrally rises in a rotating manner.
5. The system for utilizing waste heat from alkali evaporation in cyclohexanone production according to claim 2, wherein the main exhaust pipe is an L-shaped pipe, a pipe opening of a horizontal pipe section of the L-shaped pipe is connected with a steam inlet of the wastewater stripping tower and is fixed on an inner wall of the wastewater stripping tower, and the plurality of branch exhaust pipes are arranged on an outer peripheral wall of a vertical pipe section of the L-shaped pipe.
6. The evaporation waste heat utilization system for cyclohexanone production waste alkali as claimed in claim 1, wherein the liquid phase outlet of the gas-liquid separation tank and the liquid outlet of the gas condenser are both connected with an organic matter separator for recovering organic matter.
7. The system for utilizing the evaporation waste heat of the alkali waste from cyclohexanone production as claimed in claim 1, wherein the waste water outlet of the waste water stripping tower is connected with a biochemical pool.
8. The evaporation waste heat utilization system for the alkali waste in cyclohexanone production as claimed in claim 1, wherein a bottom liquid phase outlet of the alkali waste separator is connected with an alkali furnace, and is used for feeding the liquid separated by the alkali waste separator into the alkali furnace for combustion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222151952.6U CN217808827U (en) | 2022-08-16 | 2022-08-16 | Alkali waste evaporation waste heat utilization system for cyclohexanone production |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222151952.6U CN217808827U (en) | 2022-08-16 | 2022-08-16 | Alkali waste evaporation waste heat utilization system for cyclohexanone production |
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| CN217808827U true CN217808827U (en) | 2022-11-15 |
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| CN202222151952.6U Active CN217808827U (en) | 2022-08-16 | 2022-08-16 | Alkali waste evaporation waste heat utilization system for cyclohexanone production |
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