CN112374561A - High-efficiency energy-saving double-heat-pump deamination method and device - Google Patents
High-efficiency energy-saving double-heat-pump deamination method and device Download PDFInfo
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- CN112374561A CN112374561A CN202011434712.6A CN202011434712A CN112374561A CN 112374561 A CN112374561 A CN 112374561A CN 202011434712 A CN202011434712 A CN 202011434712A CN 112374561 A CN112374561 A CN 112374561A
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- ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/28—Evaporating with vapour compression
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/28—Evaporating with vapour compression
- B01D1/2887—The compressor is integrated in the evaporation apparatus
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
Abstract
The invention discloses a high-efficiency energy-saving double heat pump deamination method, which comprises the following steps: A. after the temperature of the ammonia-containing wastewater rises, the ammonia-containing wastewater is sprayed into an inlet tower from the top of the deamination tower to remove ammonia in the ammonia-containing wastewater; B. pressurizing ammonia-containing steam discharged from the tower top to form superheated gas serving as a tower kettle heat source, feeding the superheated gas into an ammonia steam reboiler to heat tower kettle liquid, wherein after the heat of the ammonia-containing steam is removed, part of the ammonia-containing steam is converted into dilute ammonia water, the other part of the ammonia-containing steam which is not condensed is used for preparing ammonia water, one part of the dilute ammonia water is used as spray liquid, and the other part of the dilute ammonia water enters a deamination tower to be deaminated circularly; C. the qualified deamination wastewater discharged from the tower kettle is pumped out and vaporized under the action of fresh steam by using a steam heat pump, low-pressure steam is pumped out, and secondary steam is generated after mixing to provide heat for a steam reboiler to heat kettle liquid; and (4) discharging the deamination wastewater out of the system after heat exchange. The invention combines two heat pumps to greatly reduce the consumption of fresh steam and the operation cost.
Description
Technical Field
The invention relates to an ammonia nitrogen wastewater treatment method, in particular to a high-efficiency energy-saving double-heat-pump deamination method and device.
Background
The steam stripping method has the characteristics of mature process, stable operation, strong adaptability to ammonia nitrogen concentration change and the like, and is widely applied in industrial practice. The steam stripping method is to adjust the pH value of the wastewater to be alkaline, then introduce air or steam into a packed tower, blow off free ammonia in the wastewater into the atmosphere or steam through gas-liquid contact, so that ammonia nitrogen is transferred from a liquid phase to a gas phase, and is suitable for treating low-concentration ammonia nitrogen wastewater at normal temperature, and acid liquor is required to be adopted to absorb the ammonia nitrogen transferred into the air so as to prevent the problem of secondary pollution of the atmosphere, and meanwhile, the problems of liquid carrying and the like caused by the discharge of a large amount of air need to be treated. The steam stripping method can raise the temperature of waste water and the ratio of ammonia to ammonia in certain pH value, so as to reach high ammonia nitrogen eliminating rate. Meanwhile, the ammonia water, the ammonia gas and the ammonium salt can be obtained by performing full condensation, partial condensation, acid liquor cooling and simultaneous neutralization on products at the top of the tower as required, compared with an air stripping method, the steam stripping method is more widely applied due to the characteristics of strong adaptability to the ammonia nitrogen concentration change of wastewater, high ammonia nitrogen removal rate and the like, but according to data statistics, the wastewater of each part of the traditional deamination method at least needs to consume 125kg of steam, one ton of water in the conventional pressure deamination process consumes 120-160 kg/h of energy, the steam needs high grade, and the steam pressure is generally more than 1MPa, so that the ammonia nitrogen wastewater treatment cost is very high, and enterprises are reluctant to or are incapable of bearing the treatment cost.
Disclosure of Invention
Aiming at the problems in the ammonia nitrogen wastewater treatment in the prior art, the invention provides the high-efficiency and energy-saving double heat pump deamination method and device which have the advantages of safe, stable and reliable process, low treatment and operation cost and reduction of fresh steam consumption.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides an efficient and energy-saving double heat pump deamination method, which comprises the following aspects:
A. preheating ammonia-containing wastewater from the outside by using condensed water and tower kettle outlet water respectively, then raising the temperature, spraying the preheated ammonia-containing wastewater into a tower from the top of the deamination tower, and carrying out mass transfer and heat transfer on the ammonia-containing wastewater in the tower by countercurrent contact with rising steam to remove ammonia in the ammonia-containing wastewater;
B. the method comprises the following steps that ammonia-containing steam discharged from the top of a tower is pressurized by an ammonia gas compressor, electric energy is converted into internal energy, the steam temperature is increased to form superheated gas, the superheated gas is sprayed and humidified by condensate to be saturated and serves as a tower kettle heat source, the superheated gas enters an ammonia gas reboiler to heat tower kettle liquid, after the heat of the ammonia-containing steam is removed, one part of the ammonia-containing steam is converted into dilute ammonia water, the other part of the ammonia-containing steam which is not condensed enters a comprehensive reactor and an ammonia water storage tank to prepare ammonia water, the dilute ammonia water is discharged from the ammonia gas reboiler and enters a condensate tank for buffering, after the dilute ammonia water is pressurized by a condensate pump, one part of the ammonia-containing steam is used as spray liquid, and;
C. qualified deamination wastewater discharged from a tower kettle enters a heat pump evaporation tank through a pump, high-temperature deamination wastewater is pumped out and vaporized under the action of fresh steam from the outside by using a steam heat pump, low-pressure steam is pumped out, secondary steam is generated after mixing to provide heat for a steam reboiler, and kettle liquid is heated; the deamination wastewater is reduced in vaporization temperature due to flash evaporation, then is pressurized by a pump, exchanges heat with a feeding heat exchanger for cooling, and is discharged out of a system through a deamination wastewater outlet.
The invention also provides a device for realizing the high-efficiency energy-saving double heat pump deamination method, which comprises a water supplementing inlet, an ammonia-containing wastewater inlet, a fresh steam inlet, a qualified ammonia water outlet, a condensed water outlet, a deamination wastewater outlet, a deamination tower, a tail gas absorption tower, a comprehensive reactor and an ammonia water storage tank; the lower part of the deamination tower is respectively connected with an inlet of a steam reboiler, a tower kettle pump and an ammonia steam reboiler circulating pump; a circulating pump of the ammonia steam reboiler is connected with the ammonia steam reboiler, a tower kettle pump is connected with a heat pump evaporating tank, the heat pump evaporating tank and a fresh steam inlet are respectively connected with a steam heat pump inlet, and the heat pump evaporating tank is connected to an deamination wastewater outlet through a discharge pump and a feeding heat exchanger; the outlet of the steam heat pump is connected with a steam reboiler, the outlet of the steam reboiler is respectively connected with the inlet in the middle of the deamination tower and a condensate tank, and the condensate tank is connected to a condensate outlet after passing through a waste heat exchanger by a condensate pump; the ammonia-containing wastewater inlet is sequentially connected with a raw water tank, a feeding pump, a waste heat exchanger, a feeding heat exchanger and an upper inlet of the deamination tower; an outlet at the top of the deamination tower is connected with an ammonia gas compressor, the ammonia gas compressor is connected with an inlet at the upper part of an ammonia gas reboiler, an outlet at the upper part of the ammonia gas reboiler is respectively connected with an inlet at the middle part of the deamination tower and an outlet at the upper part of a condensate tank, an outlet at the upper part of the condensate tank is connected with a comprehensive reactor, an outlet at the lower part of the ammonia gas reboiler is connected with an inlet at the upper part of the condensate tank, and an outlet at the lower part of the; moisturizing access connection tail gas absorption tower, tail gas absorption tower sub-unit connection washing circulating tank, washing circulating tank lower part export is connected to comprehensive reactor through the tail gas washing pump, synthesize reactor lower part export and connect the aqueous ammonia heat exchanger respectively through the aqueous ammonia circulating pump, the aqueous ammonia storage tank, the comprehensive reactor is connected to the aqueous ammonia heat exchanger, washing circulating tank, synthesize the reactor, the upper portion export of aqueous ammonia storage tank all is connected to tail gas absorption tower lower part import, aqueous ammonia storage tank lower part export is connected to qualified aqueous ammonia export through aqueous ammonia delivery pump.
The invention has the beneficial effects that: the waste heat of tower bottom liquid discharged by the deamination tower is fully utilized, and the MVR heat pump and the TVR heat pump are combined for use, so that the use amount of fresh steam can be reduced to 30-42% of that of a conventional process finally; the electricity cost and the steam cost are converted into the operation cost in a unified mode, and compared with the conventional process, the total operation cost is reduced to 55-75%.
Drawings
FIG. 1 is a schematic diagram of the process flow structure of the present invention.
In the figure, 1, a water supplement inlet 2, a deamination tower 3, a tail gas absorption tower 4, a washing circulating tank 5, a tail gas washing pump 6, an ammonia water heat exchanger 7, a qualified ammonia water outlet 8, an ammonia water delivery pump 9, a condensed water outlet 10, a deamination wastewater outlet 11, an ammonia water storage tank 12, an ammonia water circulating pump 13, a comprehensive reactor 14, an ammonia gas compressor 15, a condensate pump 16, a feeding heat exchanger 17, a waste heat exchanger 18, a condensed water tank 19, an ammonia gas reboiler 20, an ammonia gas reboiler circulating pump 21, a tower kettle pump 22, a feeding pump 23, a condensed water pump 24, a raw water tank 25, an ammonia-containing wastewater inlet 26, a discharge pump 27, a heat pump evaporating tank 28, a condensed water tank 29, a steam reboiler 30, a steam heat pump 31 and a fresh steam.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention is described in further detail below with reference to specific embodiments according to the accompanying drawings.
The invention provides an efficient and energy-saving double heat pump deamination method, which comprises the following aspects:
A. preheating ammonia-containing wastewater from the outside by using condensed water and tower kettle outlet water respectively, then raising the temperature (heating the temperature to 70-90 ℃) and spraying the preheated ammonia-containing wastewater into a tower from the top of a deamination tower, and carrying out mass transfer and heat transfer on the ammonia-containing wastewater in the tower by countercurrent contact with the raised steam to remove ammonia in the ammonia-containing wastewater;
B. ammonia-containing steam (the temperature is 85-100 ℃, the concentration is 10-30%) discharged from the top of the tower is pressurized by an ammonia gas compressor, electric energy is converted into internal energy, the temperature of the steam rises to form superheated gas, the superheated gas is saturated after being sprayed and humidified by condensate liquid and is used as a heat source of a tower kettle, the superheated gas enters an ammonia gas reboiler to heat tower kettle liquid, after the heat of the ammonia-containing steam is removed, one part of the ammonia-containing steam is converted into 2-6% dilute ammonia water, the other part of the uncondensed 25-35% ammonia-containing steam enters a comprehensive reactor and an ammonia water storage tank to prepare ammonia water, the dilute ammonia water is discharged from the ammonia gas reboiler and enters a condensate tank for buffering, after being pressurized by a condensate pump, one part of the dilute ammonia water is used as spray liquid, the other part of the ammonia-containing steam is mixed with feed materials and then enters a deamination tower for cyclic deamination, the process is an MVR heat pump working process, the steam input can be saved by about 40-60%;
C. qualified deamination wastewater discharged from a tower kettle enters a heat pump evaporation tank through a pump, high-temperature deamination wastewater is pumped out and vaporized under the action of fresh steam from the outside by using a steam heat pump, low-pressure steam is pumped out, secondary steam is generated after mixing to provide heat for a steam reboiler, and kettle liquid is heated; the deamination waste water is reduced in vaporization temperature due to flash evaporation, then is pressurized by a pump and then exchanges heat with a feeding heat exchanger for cooling, and then is discharged out of a system through a deamination waste water outlet, the process is TVR heat pump work engineering, the amount of extracted steam is different according to the pressure of raw steam, and the input amount of the raw steam can be reduced by 8-25% by taking 0.30-0.80 MPa steam as a reference. .
The invention relates to a device of a high-efficiency energy-saving double-heat-pump deamination method, which comprises a water supplementing inlet 1, an ammonia-containing wastewater inlet 25, a fresh steam inlet 31, a qualified ammonia water outlet 7, a condensed water outlet 9, a deamination wastewater outlet 10, a deamination tower 2, a tail gas absorption tower 3, a comprehensive reactor 13 and an ammonia water storage tank 11; the lower part of the deamination tower is respectively connected with an inlet of a steam reboiler 29, a tower kettle pump 21 and an ammonia steam reboiler circulating pump 20; the ammonia steam reboiler circulating pump 20 is connected with the ammonia steam reboiler 19, the tower kettle pump is connected with the heat pump evaporating tank 27, the heat pump evaporating tank and the fresh steam inlet are respectively connected with the inlet of the steam heat pump 30, and the heat pump evaporating tank is connected with the deamination wastewater outlet 10 through the discharging pump 26 and the feeding heat exchanger 16; an outlet of the steam heat pump 30 is connected with a steam reboiler 29, an outlet of the steam reboiler is respectively connected with an inlet in the middle of the deamination tower 2 and a condensate water tank 28, and the condensate water tank 28 is connected to a condensate water outlet 9 after passing through a waste heat exchanger 17 through a condensate water pump 23; an ammonia-containing wastewater inlet 25 is sequentially connected with a raw water tank 24, a feed pump 22, a waste heat exchanger 17, a feed heat exchanger 16 and an upper inlet of the deamination tower 2; an outlet at the top of the deamination tower is connected with an ammonia gas compressor 14, the ammonia gas compressor is connected with an inlet at the upper part of an ammonia gas reboiler 19, an outlet at the upper part of the ammonia gas reboiler is respectively connected with an inlet at the middle part of the deamination tower 2 and an outlet at the upper part of a condensate tank 18, an outlet at the upper part of the condensate tank is connected with a comprehensive reactor 13, an outlet at the lower part of the ammonia gas reboiler is connected with an inlet at the upper part of the condensate tank, and an outlet at the lower part of the; moisturizing import 1 connects tail gas absorption tower 3, tail gas absorption tower sub-unit connection washing circulating tank 4, washing circulating tank lower part export is connected to comprehensive reactor through tail gas washing pump 5, comprehensive reactor lower part export is connected ammonia water heat exchanger 6 respectively through ammonia water circulating pump 12, ammonia water storage tank 11, ammonia water heat exchanger connects comprehensive reactor, washing circulating tank 4, comprehensive reactor 13, the upper portion export of ammonia water storage tank 11 all is connected to 3 lower part imports of tail gas absorption tower, ammonia water storage tank lower part export is connected to qualified ammonia water export 7 through ammonia water delivery pump 8.
Claims (2)
1. An efficient and energy-saving double heat pump deamination method is characterized by comprising the following aspects:
A. preheating ammonia-containing wastewater from the outside by using condensed water and tower kettle outlet water respectively, then raising the temperature, spraying the preheated ammonia-containing wastewater into a tower from the top of the deamination tower, and carrying out mass transfer and heat transfer on the ammonia-containing wastewater in the tower by countercurrent contact with rising steam to remove ammonia in the ammonia-containing wastewater;
B. the method comprises the following steps that ammonia-containing steam discharged from the top of a tower is pressurized by an ammonia gas compressor, electric energy is converted into internal energy, the temperature of the steam rises to form superheated gas, the superheated gas is sprayed and humidified by condensate to be saturated and used as a tower kettle heat source to enter an ammonia gas reboiler to heat tower kettle liquid, after the heat of the ammonia-containing steam is removed, one part of the ammonia-containing steam is converted into dilute ammonia water, the other part of the ammonia-containing steam which is not condensed enters a comprehensive reactor and an ammonia water storage tank to prepare ammonia water, the dilute ammonia water is discharged from the ammonia gas reboiler to enter a condensate tank for buffering, after the dilute ammonia water is pressurized by a condensate pump, one part of the ammonia-containing steam is used as spray liquid, and the other;
C. qualified deamination wastewater discharged from a tower kettle enters a heat pump evaporation tank through a pump, high-temperature deamination wastewater is pumped out and vaporized under the action of fresh steam from the outside by using a steam heat pump, low-pressure steam is pumped out, secondary steam is generated after mixing to provide heat for a steam reboiler, and kettle liquid is heated; the deamination wastewater is reduced in vaporization temperature due to flash evaporation, then is pressurized by a pump, exchanges heat with a feeding heat exchanger for cooling, and is discharged out of a system through a deamination wastewater outlet.
2. The device for realizing the high-efficiency energy-saving double heat pump deamination method of claim 1 is characterized in that: the device comprises a water supplementing inlet (1), an ammonia-containing wastewater inlet (25), a fresh steam inlet (31), a qualified ammonia water outlet (7), a condensed water outlet (9), a deamination wastewater outlet (10), a deamination tower (2), a tail gas absorption tower (3), a comprehensive reactor (13) and an ammonia water storage tank (11); the lower part of the deamination tower is respectively connected with an inlet of a steam reboiler (29), a tower kettle pump (21) and an ammonia reboiler circulating pump (20); an ammonia steam reboiler circulating pump (20) is connected with an ammonia steam reboiler (19), a tower kettle pump is connected with a heat pump evaporating tank (27), the heat pump evaporating tank and a fresh steam inlet are respectively connected with an inlet of a steam heat pump (30), and the heat pump evaporating tank is connected with a deamination wastewater outlet (10) through a discharge pump (26) and a feeding heat exchanger (16); an outlet of the steam heat pump (30) is connected with a steam reboiler (29), an outlet of the steam reboiler is respectively connected with an inlet in the middle of the deamination tower and a condensate water tank (28), and the condensate water tank is connected to a condensate water outlet (9) after passing through a waste heat exchanger (17) through a condensate water pump (23); an ammonia-containing wastewater inlet (25) is sequentially connected with a raw water tank (24), a feeding pump (22), a waste heat exchanger (17), a feeding heat exchanger (16) and an upper inlet of a deamination tower; an outlet at the top of the deamination tower is connected with an ammonia gas compressor (14), the ammonia gas compressor is connected with an inlet at the upper part of an ammonia gas reboiler (19), an outlet at the upper part of the ammonia gas reboiler is respectively connected with an inlet at the middle part of the deamination tower and an outlet at the upper part of a condensate tank (18), an outlet at the upper part of the condensate tank is connected with a comprehensive reactor (13), an outlet at the lower part of the ammonia gas reboiler is connected with an inlet at the upper part of the condensate tank, and an outlet at the lower part of the condensate tank is respectively; moisturizing access connection tail gas absorption tower (3), tail gas absorption tower sub-unit connection washing circulating tank (4), washing circulating tank lower part export is connected to comprehensive reactor (13) through tail gas washing pump (5), synthesize reactor lower part export and connect aqueous ammonia heat exchanger (6) respectively through aqueous ammonia circulating pump (12), aqueous ammonia storage tank (11), the reactor is synthesized in the aqueous ammonia heat exchanger connection, the washing circulating tank, comprehensive reactor, the upper portion export of aqueous ammonia storage tank all is connected to tail gas absorption tower lower part import, aqueous ammonia storage tank lower part export is connected to qualified aqueous ammonia export (7) through aqueous ammonia delivery pump (8).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011434712.6A CN112374561A (en) | 2020-12-10 | 2020-12-10 | High-efficiency energy-saving double-heat-pump deamination method and device |
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| CN202011434712.6A CN112374561A (en) | 2020-12-10 | 2020-12-10 | High-efficiency energy-saving double-heat-pump deamination method and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113233529A (en) * | 2021-06-18 | 2021-08-10 | 深圳市源禹环保科技有限公司 | Energy-saving/low-energy-consumption ammonia nitrogen wastewater treatment and resource recovery process and device |
| CN114057340A (en) * | 2021-11-10 | 2022-02-18 | 浙江闽锋化学有限公司 | Novel DMF (dimethyl formamide) recovery device and using method thereof |
-
2020
- 2020-12-10 CN CN202011434712.6A patent/CN112374561A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113233529A (en) * | 2021-06-18 | 2021-08-10 | 深圳市源禹环保科技有限公司 | Energy-saving/low-energy-consumption ammonia nitrogen wastewater treatment and resource recovery process and device |
| CN114057340A (en) * | 2021-11-10 | 2022-02-18 | 浙江闽锋化学有限公司 | Novel DMF (dimethyl formamide) recovery device and using method thereof |
| CN114057340B (en) * | 2021-11-10 | 2024-03-19 | 浙江闽锋化学有限公司 | Use method of DMF recovery device |
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