CN112079405A - Coking residual ammonia water negative pressure ammonia distillation energy-saving device - Google Patents
Coking residual ammonia water negative pressure ammonia distillation energy-saving device Download PDFInfo
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- CN112079405A CN112079405A CN202011047941.2A CN202011047941A CN112079405A CN 112079405 A CN112079405 A CN 112079405A CN 202011047941 A CN202011047941 A CN 202011047941A CN 112079405 A CN112079405 A CN 112079405A
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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
- 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
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Abstract
The invention relates to a negative-pressure ammonia distillation energy-saving device for coking residual ammonia water, which comprises a pretreatment device, a residual ammonia water buffer tank, a waste oil tank, an alkali liquor tank, a mixer, a feeding preheater, an ammonia distillation tower, a reboiler, a dephlegmator, a tower top condenser, a gas-liquid separator, a vacuum pump, a feeding pump, an alkali liquor pump, an ammonia water pump, a tower bottom pump, a residue pump and a connecting pipeline which are sequentially connected. The negative pressure ammonia distillation energy-saving device for residual coking ammonia water is characterized in that an alkali liquor mixer is arranged on a pipeline before the residual ammonia water enters a tower, the top of the ammonia distillation tower is directly connected with a dephlegmator and is connected with a condenser, a gas-liquid separator, a vacuum pump and an ammonia water pump on the top of the tower through pipelines; the side line at the bottom of the ammonia still is connected with a tower bottom pump and a reboiler through pipelines, an external heating coil pipe is arranged at the bottom of the ammonia still, and the bottom of the ammonia still is connected with a residue pump through a pipeline. The method is applied to the negative-pressure ammonia distillation process of the residual ammonia water, and has the remarkable advantages of small investment scale, low operation cost, energy conservation, consumption reduction, flexible operation, good and stable ammonia distillation wastewater index and the like.
Description
Technical Field
The invention belongs to the field of coal chemical industry, and particularly relates to a negative-pressure ammonia distillation energy-saving device for coking residual ammonia water.
Background
A certain amount of ammonia nitrogen, cyanide, sulfide, phenol and residual ammonia water with high COD concentration are generated in the coal coking process. The residual ammonia water is pretreated, and then ammonia, cyanide and other impurities in the ammonia water are removed by ammonia distillation, so that the requirements of a sewage treatment process are met, and the ammonia is recovered.
The traditional ammonia distillation process adopts a mode of direct steam stripping, but years of production practice finds that two problems exist: firstly, the steam consumption of the ammonia distillation is large, the steam consumption is about 150-250 kg/ton of residual ammonia water, and the steam consumption accounts for a considerable part of the steam consumption in the whole coking production; and secondly, the heat source of the ammonia distillation process by the direct steam method is from direct steam, so that the wastewater amount of biochemical treatment is greatly increased. The production cost of enterprises is increased in the two aspects, and meanwhile, the energy-saving and emission-reducing policies of the country are not met, so that certain influence is brought to the environment. In recent years, the negative pressure ammonia distillation technology adopted in the coal coking industry is gradually increased, compared with the traditional technology, the negative pressure ammonia distillation technology can improve the relative volatility of components, reduce the operation temperature of a tower, reduce the corrosivity of a medium, reduce the response to the requirement of equipment materials and effectively reduce the energy consumption.
CN203794660U discloses a negative pressure ammonia distillation device for coking residual ammonia water, and the device adopts a jet pump or a liquid ring pump of an ammonium sulfate section at the top of an ammonia distillation tower to form a negative pressure ammonia distillation system. The ammonia water at the tower top is removed to the desulfurization section, and the liquid inlet of the vacuum pump is connected with the ammonium sulfate mother liquor pipeline at the ammonium sulfate section. The working solution can be introduced by adopting the jet pump and the liquid ring pump, namely, the non-condensable ammonia gas is absorbed by the working solution, so that an ammonia gas product cannot be obtained, and the product has a single structure. The tower kettle of the ammonia distillation tower adopts a kettle type reboiler, ammonia distillation wastewater enters the reboiler all the way after being pressurized by a tower bottom pump, and the ammonia distillation wastewater goes out of the reboiler all the way.
Because the water quality of the ammonia still enters the ammonia still is complicated, even if the residual ammonia water is pretreated by adopting air flotation oil removal, a ceramic filter and the like before entering the ammonia still, the ammonia still forms scale substances after long-term operation, so that the distillation effect is poor, the energy consumption is high, pipelines are blocked, and scales are formed in the tower.
The device makes a breakthrough in the aspects of energy conservation and emission reduction, reduces the daily operation cost, has low requirements on equipment materials due to negative-pressure low-temperature operation, and reduces the early investment cost.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the negative-pressure ammonia still for coking residual ammonia water, which improves the product quality and the production efficiency and reduces the production cost of gas and liquid.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a surplus aqueous ammonia negative pressure ammonia distillation economizer of coking, includes consecutive preprocessing device, surplus aqueous ammonia buffer tank, waste oil tank, lye tank, blender, feeding pre-heater, ammonia still, reboiler, dephlegmator, overhead condenser, vapour and liquid separator, vacuum pump, charge pump, lye pump, ammonia pump, bottom of the tower pump, residue pump and connecting tube. The negative pressure ammonia distillation energy-saving device for the residual coking ammonia water is characterized in that an alkali liquor mixer is arranged on a pipeline before the residual coking ammonia water enters a tower, the top of the ammonia distillation tower is directly connected with a dephlegmator and is connected with a condenser, a gas-liquid separator, a vacuum pump and an ammonia water pump on the top of the tower through pipelines; the side line at the bottom of the ammonia still is connected with a tower bottom pump and a reboiler through pipelines, an external heating coil pipe is arranged at the bottom of the ammonia still, and the bottom of the ammonia still is connected with a residue pump through a pipeline.
Furthermore, the rectification section in the ammonia still is provided with efficient regular plate corrugated packing, and the stripping section is provided with efficient vertical sieve tray.
Further, in the gas-liquid separator, the non-condensable ammonia gas can be conveyed out of the device through a vacuum pump, and the liquid-phase ammonia water can be conveyed to an ammonia water storage tank through an ammonia water pump, so that the comprehensive utilization of products at the top of the tower is realized.
Furthermore, the vacuum pump is a claw type vacuum pump.
Further, the ammonia distillation wastewater at the bottom of the ammonia distillation tower is extracted through a tower bottom pump side line and divided into two paths, one path is connected with a tube pass inlet of a reboiler, the other path is connected with a shell pass inlet of a feed preheater, and the ammonia distillation wastewater is sent to a biochemical treatment working section after heat exchange with residual ammonia water.
Furthermore, the bottom of the ammonia still is provided with a conical end enclosure accompanied with a steam coil, and steam is introduced when liquid at the bottom of the ammonia still intermittently discharges residues through a residue pump, so that the residue discharge can be accelerated, the scale formation of the tower kettle can be prevented, the distillation effect can be improved, and the index of ammonia still wastewater can be met.
Compared with the prior art, the invention has the advantages that:
1. the invention is applied to the ammonia distillation process of the residual ammonia water, and compared with the prior art, the invention adopts a form of combining the packed tower and the plate tower, thereby having large operation flexibility and high separation efficiency.
2. The method is applied to the ammonia distillation process of the residual ammonia water, the product structure is diversified, and high-purity ammonia gas and ammonia water can be obtained simultaneously. And the claw type vacuum pump is adopted, so that the absorption of the liquid type vacuum pump to ammonia gas and the treatment of tail gas are avoided.
3. The method is applied to the ammonia distillation process of the residual ammonia water, adopts the distilled ammonia wastewater extracted from the tower bottom side line to preheat the residual ammonia water, and has the advantages of energy conservation, consumption reduction, environmental protection and safety.
4. The invention is applied to the ammonia distillation process of the residual ammonia water, and the ammonia is distilled under negative pressure, thereby saving the steam consumption and reducing the ammonia distillation wastewater amount.
5. The invention is applied to the ammonia distillation process of the residual ammonia water, the tower kettle is provided with the conical seal head and the steam coil pipe, the residue discharge is accelerated, the tower kettle is effectively prevented from scaling, and the distillation efficiency is high.
Drawings
FIG. 1 is a schematic structural view of the present invention:
in the figure: 1. the system comprises a pretreatment device, 2, a waste oil tank, 3, a residual ammonia water buffer tank, 4, a feed pump, 5, an alkali liquid tank, 6, an alkali liquid pump, 7, a mixer, 8, a feed preheater, 9, an ammonia still, 10, a dephlegmator, 11, a tower top condenser, 12, a gas-liquid separator, 13, a vacuum pump, 14, an ammonia water pump, 15, a tower bottom pump, 16, a reboiler, 17 and a residue pump.
Detailed Description
Embodiments of the invention are further described below with reference to the accompanying drawings:
as shown in fig. 1, the negative-pressure residual ammonia water distilling device comprises a pretreatment device 1, a waste oil tank 2, a residual ammonia water buffer tank 3, a feed pump 4, an alkali liquor tank 5, an alkali liquor pump 6, a mixer 7, a feed preheater 8, an ammonia distilling tower 9, a dephlegmator 10, a tower top condenser 11, a gas-liquid separator 12, a vacuum pump 13, an ammonia water pump 14, a tower bottom pump 15, a reboiler 16, a residue pump 17 and connecting pipelines which are connected in sequence. The residual ammonia water negative pressure ammonia still, there is alkali liquor blender on the pipeline before the residual ammonia water enters the tower, the top of the ammonia still couples to dephlegmator directly, couple to overhead condenser, vapour-liquid separator and vacuum pump, ammonia water pump through the pipeline; the side line at the bottom of the ammonia still is connected with a tower bottom pump and a reboiler through pipelines, an external heating coil pipe is arranged at the bottom of the ammonia still, and the bottom of the ammonia still is connected with a residue pump through a pipeline. The rectification section in the ammonia still is provided with efficient regular plate corrugated packing, and the stripping section is provided with efficient vertical sieve tray. The non-condensable ammonia gas in the gas-liquid separator at the top of the tower can be conveyed out of the device through a claw type vacuum pump, and the liquid-phase ammonia water can be conveyed to an ammonia water storage tank through an ammonia water pump, so that the comprehensive utilization of products at the top of the tower is realized. The ammonia distillation wastewater at the bottom of the ammonia distillation tower is extracted through a side line of a tower bottom pump and divided into two paths, one path is connected with a tube pass inlet of a reboiler, the other path is connected with a shell pass inlet of a feed preheater, and the ammonia distillation wastewater is sent to a biochemical treatment section after heat exchange with residual ammonia water. The bottom of the ammonia still is a conical end enclosure accompanied with a steam coil, and steam is introduced when liquid at the bottom of the ammonia still intermittently discharges residues through a residue pump, so that the residue discharge can be accelerated, the scale formation of the tower bottom can be prevented, the distillation effect can be improved, and the index of ammonia still wastewater can be met.
The working process of the invention is as follows: as shown in figure 1, the residual ammonia water in the raw material is deoiled and filtered by a pretreatment device 1 and then enters a residual ammonia water buffer tank 3 for standby, and impurities such as oil, phenol and the like enter a waste oil tank 2. The pretreated ammonia water is pressurized by a feed pump 4 and then fully mixed with alkali liquor pressurized by an alkali liquor pump 6 from an alkali liquor tank 5 in a mixer 7, and the mixture enters an ammonia still 9 after being preheated by a feed preheater 8 after the pH value is adjusted. One path of ammonia water is extracted from the tower through a side line of a tower bottom pump 15 and enters a reboiler 16 to be heated and returned to the ammonia still, and the other path of ammonia water is subjected to heat exchange with raw materials through a feeding preheater 8 and then is taken as ammonia still wastewater to be discharged to a biochemical treatment section. Ammonia water and ammonia gas heated by a reboiler carry out gas-liquid mass transfer in the tower, the ammonia gas at the tower top is condensed by a dephlegmator 10 and a condenser 11 at the tower top and then enters a gas-liquid separation tank 12, the non-condensable ammonia gas is vacuumized by a claw type vacuum pump 13 to form negative pressure of an ammonia still, the pressure in the tower is maintained to be stable by adjusting the air extraction amount, and the ammonia gas extracted by the claw type vacuum pump is taken as a product to be discharged out of the device. The condensed liquid ammonia water in the gas-liquid separation tank is pressurized by an ammonia water pump 14 and then taken out of the device as an ammonia water product. The tower bottom residue is periodically discharged intermittently through the residue pump 17, and when the residue is required to be discharged, steam is introduced into the tower bottom steam coil pipe, so that the tower bottom can be effectively prevented from scaling, and the blockage of a pipeline is avoided.
Claims (6)
1. The utility model provides a surplus aqueous ammonia negative pressure of coking evaporates ammonia economizer which characterized in that: the system comprises a pretreatment device, a coking residual ammonia water buffer tank, a waste oil tank, an alkali liquor tank, a mixer, a feeding preheater, an ammonia still, a reboiler, a dephlegmator, a tower top condenser, a gas-liquid separator, a vacuum pump, a feeding pump, an alkali liquor pump, an ammonia water pump, a tower bottom pump, a residue pump and a connecting pipeline which are connected in sequence; the negative pressure ammonia distillation energy-saving device for residual coking ammonia water is characterized in that an alkali liquor mixer is arranged on a pipeline before the residual ammonia water enters a tower, the top of the ammonia distillation tower is directly connected with a dephlegmator and is connected with a condenser, a gas-liquid separator, a vacuum pump and an ammonia water pump on the top of the tower through pipelines; the side line at the bottom of the ammonia still is connected with a tower bottom pump and a reboiler through pipelines, an external heating coil pipe is arranged at the bottom of the ammonia still, and the bottom of the ammonia still is connected with a residue pump through a pipeline.
2. The negative pressure ammonia distillation energy-saving device for residual coking ammonia water of claim 1, which is characterized in that: the rectifying section in the ammonia still is provided with regular plate corrugated packing, and the stripping section is provided with a vertical sieve plate tower tray.
3. The negative pressure ammonia distillation energy-saving device for residual coking ammonia water of claim 1, which is characterized in that: the non-condensable ammonia gas in the gas-liquid separator can be conveyed out of the device through a vacuum pump, and the liquid-phase ammonia water can be conveyed to an ammonia water storage tank through an ammonia water pump.
4. The negative pressure ammonia distillation energy-saving device for residual coking ammonia water of claim 1, which is characterized in that: the vacuum pump is a claw type vacuum pump.
5. The negative pressure ammonia distillation energy-saving device for residual coking ammonia water of claim 1, which is characterized in that: the ammonia distillation wastewater at the bottom of the ammonia distillation tower is extracted through a side line of a tower bottom pump and divided into two paths, one path is connected with a tube pass inlet of a reboiler, the other path is connected with a shell pass inlet of a feed preheater, and the ammonia distillation wastewater is sent to a biochemical treatment section after heat exchange with residual ammonia water.
6. The negative pressure ammonia distillation energy-saving device for residual coking ammonia water of claim 1, which is characterized in that: the bottom of the ammonia still is a conical head with a steam coil, and the liquid at the bottom of the ammonia still is introduced with steam when the residue is discharged intermittently by a residue pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011047941.2A CN112079405A (en) | 2020-09-29 | 2020-09-29 | Coking residual ammonia water negative pressure ammonia distillation energy-saving device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011047941.2A CN112079405A (en) | 2020-09-29 | 2020-09-29 | Coking residual ammonia water negative pressure ammonia distillation energy-saving device |
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| CN112079405A true CN112079405A (en) | 2020-12-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113086992A (en) * | 2021-03-31 | 2021-07-09 | 成渝钒钛科技有限公司 | Novel energy-saving ammonia still and use method thereof |
| CN117069346A (en) * | 2023-10-16 | 2023-11-17 | 天津市创举科技股份有限公司 | Residual ammonia water distillation benzene removal device and application method thereof |
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2020
- 2020-09-29 CN CN202011047941.2A patent/CN112079405A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2643968Y (en) * | 2003-09-17 | 2004-09-29 | 中国成达工程公司 | Combined carbinol rectifying tower |
| CN101941720A (en) * | 2010-08-23 | 2011-01-12 | 天津市创举科技有限公司 | Tube furnace ammonia evaporation process and equipment |
| CN102351265A (en) * | 2011-07-07 | 2012-02-15 | 莱芜钢铁股份有限公司 | Negative pressure ammonia distillation process and device for residual ammonia water in coking production |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113086992A (en) * | 2021-03-31 | 2021-07-09 | 成渝钒钛科技有限公司 | Novel energy-saving ammonia still and use method thereof |
| CN117069346A (en) * | 2023-10-16 | 2023-11-17 | 天津市创举科技股份有限公司 | Residual ammonia water distillation benzene removal device and application method thereof |
| CN117069346B (en) * | 2023-10-16 | 2024-02-02 | 天津市创举科技股份有限公司 | Residual ammonia water distillation benzene removal device and application method thereof |
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