CN216946605U - Ammonia still of heater heat pump - Google Patents
Ammonia still of heater heat pump Download PDFInfo
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- CN216946605U CN216946605U CN202220132931.7U CN202220132931U CN216946605U CN 216946605 U CN216946605 U CN 216946605U CN 202220132931 U CN202220132931 U CN 202220132931U CN 216946605 U CN216946605 U CN 216946605U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
A heat pump ammonia still of heater comprises a phase separator, a poor and rich liquor heat exchanger, a mixer, an ammonia still, a heat pump, a gas-liquid separator and a residual ammonia water heater, wherein the phase separator is connected with the poor and rich liquor heat exchanger, the poor and rich liquor heat exchanger is connected with the residual ammonia water heater, a circulating hot water pump is arranged between the residual ammonia water heater and the heat pump, the circulating hot water inlet of the residual ammonia water heater is connected with the heat pump, the circulating hot water outlet is connected with the inlet of the circulating hot water pump, the outlet of the circulating hot water pump is connected with the heat pump, a wastewater heater is arranged outside the ammonia still, a wastewater circulating pump is arranged between the wastewater heater and the ammonia still, the inlet of the wastewater circulating pump is connected with the bottom of the ammonia still, the outlet of the wastewater circulating pump is connected with the wastewater inlet of the wastewater heater, and the wastewater outlet of the wastewater heater is connected with the hot wastewater inlet of the ammonia still. The utility model increases the temperature of the residual ammonia water entering the tower, improves the mass transfer reaction and is beneficial to the stable operation of the ammonia distillation.
Description
Technical Field
The utility model relates to the technical field of coking equipment, in particular to a heat pump ammonia still of a heater.
Background
During the purification and recovery process of the coke oven gas, residual ammonia water containing pollutants such as phenol, tar, ammonia nitrogen, sulfide, cyanide and the like is generated, and the ammonia nitrogen, the sulfide and the cyanide in the residual ammonia water are removed by adding alkali and distilling ammonia.
In the prior art, residual ammonia water is subjected to air floatation oil removal and ceramic filter oil removal, then exchanges heat with tower bottom wastewater, is mixed with alkali liquor and then is sent into an ammonia still. Direct steam or indirect steam generated by a reboiler is introduced into the bottom of the ammonia distillation tower to provide heat for distillation, the residual ammonia water generates heat transfer and mass transfer on a tower tray, ammonia steam is obtained at the tower top, and wastewater is obtained at the tower bottom. The waste water is pumped out by a waste water pump, exchanges heat with the residual ammonia water, enters a waste water cooler and is further cooled to be less than 30 ℃, and then is sent to a waste water treatment process. After the tower top ammonia vapor is condensed by a dephlegmator or a heat pump, the condensate automatically flows back to the ammonia still, and the ammonia vapor is removed from a saturator or a precooling tower, and can be further cooled into ammonia water.
The prior art has the problems that the residual ammonia water and the waste water are basically fed at 85-90 ℃ after heat exchange, the required bubble point of about 98 ℃ cannot be reached, and mass transfer is not facilitated; the waste water at the bottom of the tower absorbs heat in a reboiler and is gasified into steam, the waste water is alkaline and has strong corrosivity, and the waste water gasification process is a phase change process, so that the thermal stress borne by equipment is large, the requirement on the material of the equipment is high, and the service life is short; after waste water gasifies in the reboiler, easily cause adhesion such as tar sediment on the heat exchange tube, influence heat exchange efficiency, need frequently wash, be unfavorable for the steady operation of ammonia still.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art, and provides the heater heat pump ammonia still, which heats the residual ammonia water by the residual ammonia water heater, improves the temperature of the residual ammonia water entering the tower, and improves mass transfer; the waste water heater is used for replacing a steam reboiler, the operation temperature of a heat pump is reduced, the heat recovery efficiency is improved, phase change does not occur in the heat exchange process, the thermal stress of equipment is reduced, the service life of the equipment is prolonged, and the stable operation of ammonia distillation is facilitated; the residual ammonia water is heated by the circulating hot water of the heat pump, so that the latent heat in the ammonia steam is recycled, and the energy consumption of the ammonia distillation process is reduced.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
a heater heat pump ammonia still comprises a ceramic filter, a waste water pump, a lean and rich liquid heat exchanger, a mixer, an ammonia still, a heat pump and a gas-liquid separator, wherein the ceramic filter is connected with the lean and rich liquid heat exchanger, the lean and rich liquid heat exchanger is connected with the mixer, the mixer is connected with the ammonia still, the bottom of the ammonia still is connected with an inlet of the waste water pump, an outlet of the waste water pump is connected with the lean and rich liquid heat exchanger, the ammonia still is connected with the heat pump, the heat pump is connected with the gas-liquid separator, a liquid phase outlet of the gas-liquid separator is connected with a backflow port of the ammonia still, a phase separator is arranged between the ceramic filter and the lean and rich liquid heat exchanger, a residual ammonia water inlet of the phase separator is connected with an outlet of the ceramic filter, a residual ammonia water outlet of the phase separator is connected with a residual ammonia water inlet of the lean and rich liquid heat exchanger, a residual ammonia water heater is arranged between the lean and rich liquid heat exchanger, a residual ammonia water inlet of the residual ammonia water heater is connected with a residual ammonia water outlet of the lean and rich liquid heat exchanger, the surplus aqueous ammonia export links to each other with the surplus aqueous ammonia entry of blender, be equipped with the circulation heat pump between surplus aqueous ammonia heater and the heat pump, the circulation hot water import of surplus aqueous ammonia heater links to each other with the circulation hot water export of heat pump, and the circulation hot water export links to each other with the entry of circulation heat pump, and the export of circulation hot water pump links to each other with the circulation hot water entry of heat pump, ammonia still outside is equipped with waste water heater, is equipped with the waste water circulating pump between waste water heater and the ammonia still, waste water circulating pump's entry links to each other with ammonia still's bottom, and waste water circulating pump's export links to each other with waste water heater's waste water entry, and waste water heater's waste water export links to each other with ammonia still's hot waste water entry.
The waste water heater is characterized in that a low-pressure steam pipe network is arranged above the waste water heater, a condensate water recoverer is arranged below the waste water heater, a steam inlet of the waste water heater is connected with the low-pressure steam pipe network, and a condensate water outlet of the waste water heater is connected with the condensate water recoverer.
The waste water heater adopts low-pressure saturated steam of 0.5 MPa.
And a condensate water pump is arranged outside the condensate water recoverer, a gas phase outlet of the condensate water recoverer is connected with the low-pressure steam pipe network, and a liquid phase outlet of the condensate water recoverer is connected with the condensate water pump.
The device is characterized in that a mechanical clarifying tank is arranged outside the phase separator, a tar residue processor is arranged below the phase separator, the phase separator is provided with a floating oil outlet and a tar residue outlet, the floating oil outlet is connected with the mechanical clarifying tank, and the tar residue outlet is connected with the tar residue processor.
The utility model has the beneficial effects that:
1. the residual ammonia water is heated in the residual ammonia water heater through the circulating hot water of the heat pump, so that the temperature of the residual ammonia water is increased to about 100 ℃, the tower entering temperature of the residual ammonia water is increased, the bubble point feeding of the residual ammonia water is realized, the mass transfer reaction of the residual ammonia water in the ammonia still is facilitated, the utilization of the latent heat of ammonia vapor is realized, the energy consumption in the ammonia still process is further reduced, and the economic benefit of enterprises is improved.
2. In the process of heating the residual ammonia water, the temperature of the circulating hot water is reduced, the heat efficiency of the heat pump is improved, the latent heat in the ammonia vapor is absorbed better, and the energy consumption of the ammonia evaporation process is further reduced.
3. The waste water heater uses low-pressure steam as a heat source, improves the temperature of waste water to about 130 ℃ and enters the tower through a hot waste water inlet, provides distillation heat, has no phase change in the waste water heater, reduces the damage of thermal stress to equipment, eliminates the problem that the equipment is blocked due to the concentration of impurities caused by water gasification, has long service life, is favorable for the stable operation of ammonia distillation, improves the working efficiency and increases the economic benefit of enterprises.
4. After the low-pressure steam heats the wastewater in the wastewater heater, the low-pressure steam is circulated back to the low-pressure steam pipe network through the condensate water recoverer, so that the steam is recycled, the wastewater is reduced, the production cost is reduced, and the economic benefit is improved.
5. The oil and slag removal of the phase separator is added after the conventional ceramic filter, the quality of residual ammonia water is improved, tar slag and the like are prevented from being adhered to the heat exchange tube, the heat exchange efficiency is improved, frequent cleaning is not needed, stable operation of ammonia distillation is facilitated, separated floating oil and tar slag can be conveyed to other procedures for treatment, and the product value is improved.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
in the figure, 1, the residual ammonia water tank; 2. a residual ammonia pump; 3. air floatation oil removing machine; 4. a ceramic filter; 5. a phase separator; 6. a lean-rich liquid heat exchanger; 7. a residual ammonia water heater; 8. a mixer; 9. an ammonia still; 10. a circulating hot water pump; 11. a heat pump; 12. a gas-liquid separator; 13. a desulfurization pre-cooling tower; 14. an ammonia water cooler; 15. an ammonia tank; 16. a wastewater circulating pump; 17. a waste water heater; 18. a condensed water recoverer; 19. a condensate pump; 20. a waste water pump; 21. a wastewater cooler; 22. a mechanical clarifying tank; 23. a tar residue processor; 24. low pressure steam pipe network.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments.
As shown in fig. 1, the ammonia distillation device of the heat pump of the heater comprises a residual ammonia water tank 1, an air flotation oil removing machine 3, a lean-rich heat exchanger 6, a mixer 8, an ammonia distillation tower 9, a heat pump 11 and a gas-liquid separator 12, wherein the residual ammonia water tank 1 is connected with the air flotation oil removing machine 3 through a pipeline, a residual ammonia water pump 2 is arranged in the pipeline, residual ammonia water is conveyed into the air flotation oil removing machine 3 through the residual ammonia water pump to remove part of floating oil, and the residual ammonia water is discharged from a liquid phase outlet of the air flotation oil removing machine 3.
The liquid phase outlet of the air floatation oil removing machine 3 is connected with the inlet of the ceramic filter 4, when the residual ammonia water passes through the micropore medium in the ceramic filter 4, macromolecular oil and tar dust are intercepted, and the residual ammonia water passes through and is discharged from the liquid phase outlet of the ceramic filter 4.
The liquid phase outlet of the ceramic filter 4 is connected with the inlet of the phase separator 5, the phase separator 5 is provided with a floating oil outlet, a residual ammonia water outlet and a tar residue outlet, the floating oil outlet is connected with the mechanized clarifying tank 22, the residual ammonia water outlet is connected with the lean-rich liquid heat exchanger 6, and the tar residue outlet is connected with the tar residue processor 23. The separation of tar slag, ammonia water and floating oil is realized by utilizing the principle of condensation and gravity in the phase separator 5, the floating oil is obtained at the uppermost layer, the residual ammonia water is sent to the mechanized clarifying tank 22 through the floating oil outlet, the outlet at the lowermost part is the tar slag outlet and is sent to the tar slag processor 23, the residual ammonia water at the middle part enters the lean-rich liquid heat exchanger 6 through the residual ammonia water outlet, the residual ammonia water processed by the phase separator 5 has fewer impurities and less oil content, and pipelines are not easy to block in the subsequent process flow.
In the lean-rich liquor heat exchanger 6, the residual ammonia water exchanges heat with the ammonia distillation wastewater sent by the wastewater pump 20, the temperature of the residual ammonia water is raised to 80-90 ℃, and the ammonia distillation wastewater after heat exchange is cooled by a wastewater cooler 21 and then discharged into a wastewater treatment system.
A residual ammonia water outlet of the lean-rich liquid heat exchanger 6 is connected with a residual ammonia water inlet of a residual ammonia water heater 7, a circulating hot water pump 10 is arranged between the residual ammonia water heater 7 and a heat pump 11, a circulating hot water inlet of the residual ammonia water heater 7 is connected with a circulating hot water outlet of the heat pump 11, a circulating hot water outlet is connected with an inlet of the circulating hot water pump 10, an outlet of the circulating hot water pump 10 is connected with a circulating hot water inlet of the heat pump 11, in the residual ammonia water heater 7, the residual ammonia water exchanges heat with 100-115 ℃ circulating hot water from the heat pump 11, the temperature of the residual ammonia water is raised to about 100 ℃, the residual ammonia water is discharged from the residual ammonia water outlet of the residual ammonia water heater 7 and enters an inlet of a mixer 8, and in the mixer 8, the residual ammonia water is mixed with 30% alkali liquor and then is injected into a raw material inlet of an ammonia still 9. The temperature of the residual ammonia water entering the tower is increased, so that the bubble point feeding of the residual ammonia water is realized, the mass transfer reaction of the residual ammonia water in the ammonia still 9 is facilitated, the utilization of the latent heat of the ammonia steam is realized, the energy consumption in the ammonia still process is further reduced, and the economic benefit is improved.
In the ammonia still 9, the residual ammonia water is subjected to heat transfer and mass transfer to generate ammonia and CO2、H2S and ammonia vapor of water, wherein the heat pump 11 comprises an evaporator and a generator, heat medium inlets of the evaporator and the generator are respectively connected with an ammonia vapor outlet of the ammonia still 9, heat medium outlets of the evaporator and the generator are connected with inlets of a gas-liquid separator 12, a gas-phase outlet of the gas-liquid separator 12 is respectively connected with inlets of a desulfurization pre-cooling tower 13 and an ammonia water cooler 14, and a liquid-phase outlet of the gas-liquid separator 12 is connected with a reflux inlet of the ammonia still 9.
The ammonia water cooler 14 adopts circulating water as a cooling medium, cools the ammonia water to normal temperature by using the circulating water, and sends the cooled circulating water to a raw material inlet of the ammonia water tank 15 from a heat medium outlet of the ammonia water cooler 14 to be used as a desulfurization alkali source.
The device is characterized in that a waste water heater 17 is arranged outside the ammonia still 9, a waste water circulating pump 16 is arranged between the waste water heater 17 and the ammonia still 9, an inlet of the waste water circulating pump 16 is connected with the bottom of the ammonia still 9, an outlet of the waste water circulating pump 16 is connected with a waste water inlet of the waste water heater 17, a waste water outlet of the waste water heater 17 is connected with a hot waste water inlet of the ammonia still 9, a low-pressure steam pipe network 24 is arranged above the waste water heater 17, a condensed water recoverer 18 is arranged below the waste water heater 17, a steam inlet of the waste water heater 17 is connected with a low-pressure steam pipe network 27, and a condensed water outlet of the waste water heater 17 is connected with the condensed water recoverer 18. The waste water heater 17 adopts low-pressure saturated steam of 0.5MPa, and the waste water heater 17 is used for replacing a reboiler, so that no phase change exists in the heat exchange process, the thermal stress of equipment is reduced, the problem that the equipment is blocked due to impurity concentration caused by water gasification is solved, the service life of the equipment is prolonged, and the stable operation of ammonia distillation is facilitated.
A condensate water pump 19 is arranged outside the condensate water recoverer 18, a gas phase outlet of the condensate water recoverer 18 is connected with a low-pressure steam pipe network 24, a liquid phase outlet is connected with the condensate water pump 19, an outlet of the condensate water pump 19 is connected with a demineralized water system, and condensate water is pressurized by the condensate water pump 19 and then discharged into the demineralized water system.
The inlet of the wastewater pump 20 is connected with the bottom of the ammonia still 9, the outlet is connected with the wastewater inlet of the lean-rich liquid heat exchanger 6, the wastewater outlet of the lean-rich liquid heat exchanger 6 is connected with the wastewater inlet of the wastewater cooler 21, and the wastewater outlet of the wastewater cooler 21 is connected with the wastewater treatment process.
In the description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for the purpose of describing the present invention but do not require that the present invention must be constructed or operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" in the present invention should be interpreted broadly, and may be connected or disconnected, for example; the terms may be directly connected or indirectly connected through intermediate components, and specific meanings of the terms may be understood as specific conditions by those skilled in the art.
The above description is of the preferred embodiment of the present invention, and the description of the specific embodiment is only for better understanding of the idea of the present invention. It will be appreciated by those skilled in the art that various modifications and equivalents may be made in accordance with the principles of the utility model and are considered to be within the scope of the utility model.
Claims (5)
1. A heater heat pump ammonia still comprises a ceramic filter, a waste water pump, a lean and rich liquid heat exchanger, a mixer, an ammonia still, a heat pump and a gas-liquid separator, wherein the ceramic filter is connected with the lean and rich liquid heat exchanger, the lean and rich liquid heat exchanger is connected with the mixer, the mixer is connected with the ammonia still, the bottom of the ammonia still is connected with the inlet of the waste water pump, the outlet of the waste water pump is connected with the lean and rich liquid heat exchanger, the ammonia still is connected with the heat pump, the heat pump is connected with the gas-liquid separator, the liquid phase outlet of the gas-liquid separator is connected with the reflux port of the ammonia still, the heater is arranged between the lean and rich liquid heat exchanger and the ammonia still, the residual ammonia water inlet of the phase separator is connected with the outlet of the ceramic filter, the residual ammonia water outlet of the phase separator is connected with the residual ammonia water inlet of the lean and rich liquid heat exchanger, and a residual ammonia water heater is arranged between the lean and rich liquid heat exchanger and the ammonia still, the surplus aqueous ammonia entry of surplus aqueous ammonia heater links to each other with the surplus aqueous ammonia export of lean and rich liquid heat exchanger, and the surplus aqueous ammonia export links to each other with the surplus aqueous ammonia entry of blender, be equipped with the circulation heat pump between surplus aqueous ammonia heater and the heat pump, the circulation hot water import of surplus aqueous ammonia heater links to each other with the circulation hot water export of heat pump, and the circulation hot water export links to each other with the entry of circulation heat pump, and the export of circulation hot water pump links to each other with the circulation hot water entry of heat pump, ammonia still outside is equipped with the waste water heater, is equipped with the waste water circulating pump between waste water heater and the ammonia still, the entry of waste water circulating pump links to each other with the bottom of ammonia still, and the export of waste water circulating pump links to each other with the waste water entry of waste water heater, and the waste water entry of waste water heater links to each other with the hot waste water entry of ammonia still.
2. The heat pump ammonia still as claimed in claim 1, wherein the waste water heater has a low pressure steam pipe network above it and a condensed water recovery device below it, the steam inlet of the waste water heater is connected to the low pressure steam pipe network, and the condensed water outlet of the waste water heater is connected to the condensed water recovery device.
3. The heat pump ammonia still as claimed in claim 2, wherein the waste water heater uses low pressure saturated steam of 0.5 MPa.
4. The heater heat pump ammonia still as claimed in claim 2, wherein a condensate pump is provided outside the condensate recoverer, a gas phase outlet of the condensate recoverer is connected to a low pressure steam pipe network, and a liquid phase outlet is connected to the condensate pump.
5. The ammonia still of the heater heat pump as claimed in claim 1, wherein the phase separator is provided with a mechanical clarifying tank at the outside and a tar residue processor at the bottom, the phase separator is provided with a floating oil outlet and a tar residue outlet, the floating oil outlet is connected with the mechanical clarifying tank, and the tar residue outlet is connected with the tar residue processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220132931.7U CN216946605U (en) | 2022-01-18 | 2022-01-18 | Ammonia still of heater heat pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220132931.7U CN216946605U (en) | 2022-01-18 | 2022-01-18 | Ammonia still of heater heat pump |
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| Publication Number | Publication Date |
|---|---|
| CN216946605U true CN216946605U (en) | 2022-07-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220132931.7U Active CN216946605U (en) | 2022-01-18 | 2022-01-18 | Ammonia still of heater heat pump |
Country Status (1)
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| CN (1) | CN216946605U (en) |
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2022
- 2022-01-18 CN CN202220132931.7U patent/CN216946605U/en active Active
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