CN110642321A - Supergravity-enhanced dry-method denitration ammonia production device - Google Patents
Supergravity-enhanced dry-method denitration ammonia production device Download PDFInfo
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- CN110642321A CN110642321A CN201910796253.7A CN201910796253A CN110642321A CN 110642321 A CN110642321 A CN 110642321A CN 201910796253 A CN201910796253 A CN 201910796253A CN 110642321 A CN110642321 A CN 110642321A
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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
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/10—Separation of ammonia from ammonia liquors, e.g. gas liquors
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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
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Abstract
The utility model provides a supergravity strengthens dry process denitration ammonia production device, belongs to dry process denitration technical field, can solve the uneven problem that gas distribution, blow-off rate and ammonia production rate are lower that exists among the current supergravity ammonia production system, including raw materials groove, the rotatory packed bed of supergravity, waste liquid groove, ammonia recovery system and gaseous buffer tank, one side of the rotatory packed bed of supergravity is equipped with gas feed, and the top is equipped with gas outlet, and the bottom is equipped with liquid inlet and liquid outlet respectively, and raw materials groove passes through the liquid pump and is connected with liquid inlet, and liquid outlet is connected with waste liquid groove, and gas heating device and gas inlet connection are passed through to the one end of gaseous buffer tank, and the other end is connected with the fan, and gas outlet and ammonia recovery system are connected. The invention can realize the purpose of improving the stripping efficiency and the ammonia yield.
Description
Technical Field
The invention belongs to the technical field of dry denitration, and particularly relates to a supergravity enhanced dry denitration ammonia production device.
Background
The dry denitration ammonia production process comprises a urea pyrolysis process and a liquid ammonia gasification process, wherein the urea pyrolysis process has good safety, but has high operation cost and complex process; the liquid ammonia gasification process has low operation cost, but the liquid ammonia needs to be stored at high pressure and is easy to leak, so that potential safety hazards exist. The supergravity reinforced stripping technology can effectively solve the problems and is widely researched.
Compared with the traditional stripping equipment, the rotary packed bed has the advantages of high stripping rate, low mass transfer resistance, good economy and the like. However, in the stripping process, the gas entering the filler inevitably generates gas bias flow due to the limitation of the size of a gas pipeline or a bed, and meanwhile, the gas in the bed has high mobility and is loaded by a flow channel, so that the uniform distribution of the gas through a filler layer is difficult to realize, the mass transfer efficiency is influenced, and the mass transfer is limited.
Aiming at the phenomenon of uneven gas distribution of mass transfer equipment, broad scholars conduct extensive research on gas distributors. Patent CN2016103385U discloses a dual tangential circulation feeding distributor which reduces the material flow resistance, enhances the uniform distribution effect, and eliminates the vortex of the ascending air flow to make the ascending air flow more uniform. Patent CN203373162U discloses a carbonization tower gas distributor, has realized even gas distribution, ensures to prevent the bias flow and has improved product quality and production efficiency. Patent CN207221880U discloses a reation kettle gas distributor, is provided with the buffer chamber with gas distributor, can make liquid phase ability and gaseous even contact when the buffering, and the breather pipe top sets up the bubble cap, and gaseous discharges through bubble cap edge certain angle, can make gaseous evenly distributed. Although the above patent realizes redistribution and remixing of gas, the problems of complex structure of the gas distributor, high difficulty in process realization and the like exist.
In addition, the ammonia nitrogen wastewater is one of the main industrial wastewater in China, the source of the ammonia nitrogen wastewater is very wide, and the ammonia nitrogen wastewater is used as the source for preparing ammonia, so that the cost for preparing ammonia is greatly reduced, and the wastewater can be effectively treated. Therefore, the patent also explores the ammonia production from the ammonia nitrogen wastewater by the supergravity enhanced stripping.
Disclosure of Invention
The invention provides a supergravity enhanced dry-process denitration ammonia production device, aiming at the problems of uneven gas distribution, low stripping rate and low ammonia production rate in the conventional supergravity ammonia production system.
The invention adopts the following technical scheme:
a supergravity enhanced dry denitration ammonia production device comprises a raw material tank, a supergravity rotating packed bed, a waste liquid tank, an ammonia recovery system and a gas buffer tank, wherein a shell is arranged on the outer side of the supergravity rotating packed bed, a gas inlet is formed in one side of the shell, a gas outlet is formed in the top of the shell, a liquid inlet and a liquid outlet are formed in the bottom of the shell respectively, the raw material tank is connected with the liquid inlet through a liquid pump, the liquid outlet is connected with the waste liquid tank, one end of the gas buffer tank is connected with the gas inlet through a gas heating device, the other end of the gas buffer tank is connected with a fan, and the gas outlet is;
the center of the hypergravity rotating packed bed is provided with an annular packing support frame, packing is arranged in the packing support frame, the center of the packing support frame is provided with a tubular liquid distributor, a plurality of nozzles are arranged on a connecting pipe of the tubular liquid distributor, the top center of the hypergravity rotating packed bed is connected with a driving device through a rotating shaft, a corrugated gas distribution plate is arranged at a gas inlet of the hypergravity rotating packed bed, a through hole is formed in the center of the corrugated gas distribution plate, and the tubular liquid distributor penetrates through the through hole of the corrugated gas distribution plate.
The nozzle area of the tubular liquid distributor is 1/5 ~ 1/3 of the connecting pipe area of the tubular liquid distributor, the number of the nozzles is 3 ~ 6, and the height of the tubular liquid distributor is the same as that of the filler.
The distance between the tubular liquid distributor and the filler support frame is 10 ~ 25 mm.
The space between the packing and the shell of the hypergravity rotating packed bed is 10 ~ 30 mm.
And a sealing ring is arranged between the top of the shell and the rotating shaft.
And a sealing ring is arranged between the liquid inlet at the bottom of the shell and the tubular liquid distributor.
The invention has the following beneficial effects:
1. the invention can rapidly heat the gas phase, thereby saving time and cost;
2. the invention adopts a blowing mode, so that the generated ammonia gas can be rapidly taken out, and the ammonia gas in the rotary packed bed is prevented from being discharged along with the liquid;
3. the invention adopts the rotary packed bed to treat the ammonia nitrogen wastewater, has small equipment volume, small occupied area, convenient installation and maintenance, high mass transfer effect and high ammonia stripping rate.
4. The corrugated gas distribution plate is arranged, so that the gas entering the bed layer can be redistributed and remixed, the gas entering the filler is uniformly distributed, and the stripping efficiency and the ammonia yield are improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a high gravity rotating packed bed of the present invention;
FIG. 3 is a schematic top view of the corrugated air distributor of the present invention;
FIG. 4 is a schematic flow chart of the present invention;
wherein: 1-a raw material tank; 2-a waste liquid tank; 3-an ammonia recovery system; 4-gas buffer tank; 5-a shell; 6-gas inlet; 7-gas outlet; 8-a liquid inlet; 9-a liquid outlet; 10-a liquid pump; 11-gas heating means; 12-a fan; 13-a filler support; 14-a filler; 15-a tubular liquid distributor; 16-a drive device; 17-corrugated gas distribution plate.
Detailed Description
The invention is further explained with reference to the accompanying drawings.
A supergravity enhanced dry denitration ammonia production device comprises a raw material tank 1, a supergravity rotating packed bed, a waste liquid tank 2, an ammonia recovery system 3 and a gas buffer tank 4, wherein a shell 5 is arranged outside the supergravity rotating packed bed, one side of the shell 5 is provided with a gas inlet 6, the top of the shell is provided with a gas outlet 7, the bottom of the shell is respectively provided with a liquid inlet 8 and a liquid outlet 9, the raw material tank 1 is connected with the liquid inlet 8 through a liquid pump 10, the liquid outlet 9 is connected with the waste liquid tank 2, one end of the gas buffer tank 4 is connected with the gas inlet 6 through a gas heating device 11, the other end of the gas buffer tank is connected with a fan 12, and the gas outlet 7 is connected with the ammonia;
the center of the hypergravity rotating packed bed is provided with an annular packing support frame 13, packing 14 is arranged in the packing support frame 13, the center of the packing support frame 13 is provided with a tubular liquid distributor 15, a plurality of nozzles are arranged on a connecting pipe of the tubular liquid distributor 15, the top center of the hypergravity rotating packed bed is connected with a driving device 16 through a rotating shaft, a corrugated gas distribution plate 17 is arranged at the gas inlet 6 of the hypergravity rotating packed bed, a through hole is formed in the center of the corrugated gas distribution plate 17, and the tubular liquid distributor 15 penetrates through the through hole of the corrugated gas distribution plate 17.
The nozzle area of the tubular liquid distributor 15 is 1/5 ~ 1/3 of the area of the connecting pipe of the tubular liquid distributor 15, the number of the nozzles is 3 ~ 6, and the height of the tubular liquid distributor 15 is the same as that of the packing 14.
The distance between the tubular liquid distributor 15 and the filler support frame 13 is 10 ~ 25 mm.
The space between the packing and the shell 5 of the hypergravity rotating packed bed is 10 ~ 30 mm.
And a sealing ring is arranged between the top of the shell 5 and the rotating shaft.
And a sealing ring is arranged between the liquid inlet 8 at the bottom of the shell 5 and the tubular liquid distributor 15.
The gas heating device is connected with the gas buffer tank 4 and the fan through pipelines. Air enters the gas heating device through the fan and the gas buffer tank, is heated to a set temperature and then enters the rotary packed bed through the gas inlet of the rotary packed bed; the external heat source can be hot gas (electric hot gas, steam, cold machine cooling hot gas) or hot water (warm water in a factory, cold machine cooling water and boiler drainage);
the corrugated gas distribution plate is fixed at a gas inlet through a bolt and is a place for realizing gas remixing and redistribution, air is heated to a specified temperature through a gas heating device, enters the corrugated gas distribution plate through a gas inlet pipeline to realize gas redistribution, and then enters the filler to be contacted with a liquid phase;
the hypergravity rotating packed bed is a place where air is used as a stripping agent to blow off ammonia nitrogen wastewater and heat and mass transfer are carried out, the air is heated to a specified temperature by a gas heating device and contacts with the ammonia nitrogen wastewater in a rotating packing to complete the blowing off process, and ammonia gas is prepared; the raw material tank is connected with an ammonia nitrogen wastewater dosing system and a waste liquid tank, ammonia nitrogen wastewater and waste water with unqualified discharge standards are received, the pH value of the waste water is adjusted to 11.0, and when the ammonia nitrogen wastewater in the waste liquid tank is qualified through detection, the waste water is directly discharged and does not enter the raw material tank any more;
in the process of blowing off the ammonia nitrogen wastewater, OH in a liquid phase-The concentration of (a) significantly affects the free ammonia content, and therefore, the free ammonia content as a percentage of the total ammonia at different pH values is calculated. The percentage of free ammonia to total ammonia at different pH values at 101 kPa and 25 ℃ is shown in the following table:
the ammonia recovery system is connected with the supergravity rotating packed bed and the SCR or SNCR ammonia spraying system, ammonia nitrogen wastewater can be separated from ammonia-containing gas after being removed in the supergravity rotating packed bed, the wastewater flows into a waste liquid tank through a pipeline under the action of gravity, the ammonia-containing gas enters the ammonia recovery system through the pipeline to serve as an ammonia source of a dry-process denitration technology, the purification of NOx in smoke is realized, and secondary pollution is avoided.
The reflux system is used for connecting the waste liquid tank and the stock solution tank, when the ammonia nitrogen wastewater is subjected to stripping operation, the ammonia nitrogen outflow concentration and the ammonia nitrogen wastewater removal rate can not reach the standard, the ammonia nitrogen wastewater in the waste liquid tank needs to be introduced into the stock solution tank again in a reflux mode for ammonia nitrogen removal operation, so that the higher ammonia nitrogen stripping rate is maintained.
An application method of a supergravity enhanced dry denitration ammonia production device comprises the following specific steps:
step 1, adding a certain amount of ammonia water into an ammonia nitrogen wastewater dosing system, adjusting the pH value of wastewater to 11.0 by adopting sodium hydroxide, and then feeding the wastewater into a raw material tank under the action of gravity;
step 2, conveying the wastewater in the raw material tank into a rotary packed bed through an infusion pump and an infusion tube according to 100L/h;
The concentration of the ammonia nitrogen wastewater in the step 1 is 25 wt%.
In the embodiment 1, the air inlet temperature is 120 ℃, the gas-liquid ratio is 500, the liquid inlet temperature is 20 ℃, the hypergravity factor is 10 ~ 70, the air stripping rate is 24.3 ~ 31.5.5 percent and the ammonia yield can reach 47 percent when the concentration of the simulated ammonia nitrogen wastewater is 25 wt percent, after the corrugated gas separating plate is arranged at the gas inlet, the air stripping rate is improved by 10 percent, the ammonia yield is improved by 5 percent, namely the air stripping rate reaches 26.73 ~ 34.65.65 percent and the ammonia yield reaches 51.7 percent.
Example 2: the liquid inlet temperature is 20 ℃, the gas-liquid ratio is 3000, the hypergravity factor is 179.22, and the ammonia production concentration can reach 4.8%; after the corrugated gas sub-plate is arranged at the gas inlet, the ammonia yield can be improved by 10.7 percent.
Example 3: as shown in example 2, other conditions are unchanged, and when the gas-liquid ratio is 7000, the ammonia production concentration can reach 4.8%; the concentration of ammonia produced after the corrugated gas separating plate is additionally arranged is 5.3 percent.
Example 4: to more closely approach the working conditions, the liquid is fixedThe inlet temperature is 20 ℃, the ammonia water feeding amount is 100L/h, the ammonia nitrogen wastewater with the ammonia nitrogen content of 2 wt percent is blown off, and when the liquid-gas ratio is highRWhen the catalyst is not less than 150 percent, the stripping rate can reach 36.6 percent, the ammonia yield is up to 3.0 percent and is lower than 5.0 percent required by dry denitration; after the corrugated gas separating plate is arranged at the gas inlet, the stripping rate can be improved by 10.3 percent, and the ammonia yield can be improved by 5 percent.
Claims (6)
1. The utility model provides a supergravity strengthens dry process denitration ammonia plant which characterized in that: the device comprises a raw material tank (1), a supergravity rotating packed bed, a waste liquid tank (2), an ammonia recovery system (3) and a gas buffer tank (4), wherein a shell (5) is arranged outside the supergravity rotating packed bed, a gas inlet (6) is arranged on one side of the shell (5), a gas outlet (7) is arranged at the top of the shell, a liquid inlet (8) and a liquid outlet (9) are respectively arranged at the bottom of the shell, the raw material tank (1) is connected with the liquid inlet (8) through a liquid pump (10), the liquid outlet (9) is connected with the waste liquid tank (2), one end of the gas buffer tank (4) is connected with the gas inlet (6) through a gas heating device (11), the other end of the gas buffer tank is connected with a fan (12), and the gas outlet (7) is connected with the;
the center of the hypergravity rotation packed bed is provided with an annular packing support frame (13), packing (14) is arranged in the packing support frame (13), the center of the packing support frame (13) is provided with a tubular liquid distributor (15), a plurality of nozzles are arranged on a connecting pipe of the tubular liquid distributor (15), the top center of the hypergravity rotation packed bed is connected with a driving device (16) through a rotating shaft, a corrugated gas distribution plate (17) is arranged at a gas inlet (6) of the hypergravity rotation packed bed, a through hole is formed in the center of the corrugated gas distribution plate (17), and the tubular liquid distributor (15) penetrates through holes of the corrugated gas distribution plate (17).
2. The high-gravity-enhanced dry denitration ammonia plant as claimed in claim 1, wherein the nozzle area of the tubular liquid distributor (15) is 1/5 ~ 1/3 of the connecting pipe area of the tubular liquid distributor (15), the number of nozzles is 3 ~ 6, and the height of the tubular liquid distributor (15) is the same as that of the filler (14).
3. The high-gravity-enhanced dry denitration ammonia production device according to claim 1, wherein the distance between the tubular liquid distributor (15) and the filler support frame (13) is 10 ~ 25 mm.
4. The high-gravity reinforced dry denitration ammonia plant as claimed in claim 1, wherein the distance between the packing of the high-gravity rotating packed bed and the shell (5) is 10 ~ 30 mm.
5. The supergravity-enhanced dry denitration ammonia plant according to claim 1, characterized in that: and a sealing ring is arranged between the top of the shell (5) and the rotating shaft.
6. The supergravity-enhanced dry denitration ammonia plant according to claim 1, characterized in that: and a sealing ring is arranged between the liquid inlet (8) at the bottom of the shell (5) and the tubular liquid distributor (15).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910796253.7A CN110642321A (en) | 2019-08-27 | 2019-08-27 | Supergravity-enhanced dry-method denitration ammonia production device |
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| CN201910796253.7A CN110642321A (en) | 2019-08-27 | 2019-08-27 | Supergravity-enhanced dry-method denitration ammonia production device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112337114A (en) * | 2020-10-22 | 2021-02-09 | 中北大学 | Heat-carrying-gas-driven supergravity enhanced evaporation device and method |
| CN112337130A (en) * | 2020-10-22 | 2021-02-09 | 中北大学 | Device and method for supergravity direct crystallization |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2518844Y (en) * | 2001-12-26 | 2002-10-30 | 上海化工研究院 | Ammonia air-separating tower for garbage percolation liquid |
| CN107029455A (en) * | 2017-02-27 | 2017-08-11 | 中北大学 | The device and technique of ammonia during a kind of gravity Method stripping glue is clear |
| CN109647315A (en) * | 2019-01-08 | 2019-04-19 | 北京化工大学 | Super-gravity device, method for oxidation and the system that energy makes full use of |
-
2019
- 2019-08-27 CN CN201910796253.7A patent/CN110642321A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2518844Y (en) * | 2001-12-26 | 2002-10-30 | 上海化工研究院 | Ammonia air-separating tower for garbage percolation liquid |
| CN107029455A (en) * | 2017-02-27 | 2017-08-11 | 中北大学 | The device and technique of ammonia during a kind of gravity Method stripping glue is clear |
| CN109647315A (en) * | 2019-01-08 | 2019-04-19 | 北京化工大学 | Super-gravity device, method for oxidation and the system that energy makes full use of |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112337114A (en) * | 2020-10-22 | 2021-02-09 | 中北大学 | Heat-carrying-gas-driven supergravity enhanced evaporation device and method |
| CN112337130A (en) * | 2020-10-22 | 2021-02-09 | 中北大学 | Device and method for supergravity direct crystallization |
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Application publication date: 20200103 |