CN110963508A - Device and process for preparing solid ammonium chloride from ammonia-containing waste gas - Google Patents
Device and process for preparing solid ammonium chloride from ammonia-containing waste gas Download PDFInfo
- Publication number
- CN110963508A CN110963508A CN202010040666.5A CN202010040666A CN110963508A CN 110963508 A CN110963508 A CN 110963508A CN 202010040666 A CN202010040666 A CN 202010040666A CN 110963508 A CN110963508 A CN 110963508A
- Authority
- CN
- China
- Prior art keywords
- absorption tower
- ammonia
- waste gas
- ammonium chloride
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 136
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 title claims abstract description 110
- 239000002912 waste gas Substances 0.000 title claims abstract description 67
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 63
- 235000019270 ammonium chloride Nutrition 0.000 title claims abstract description 55
- 239000007787 solid Substances 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000010521 absorption reaction Methods 0.000 claims abstract description 150
- 239000007789 gas Substances 0.000 claims abstract description 44
- 239000007921 spray Substances 0.000 claims abstract description 33
- 239000002253 acid Substances 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000005507 spraying Methods 0.000 claims abstract description 14
- 239000012530 fluid Substances 0.000 claims abstract 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 239000007788 liquid Substances 0.000 claims description 20
- 239000013589 supplement Substances 0.000 claims description 12
- 239000008213 purified water Substances 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 7
- 238000000746 purification Methods 0.000 claims description 7
- 230000001502 supplementing effect Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000012452 mother liquor Substances 0.000 claims description 3
- 239000000047 product Substances 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 abstract description 7
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 9
- 229910052782 aluminium Inorganic materials 0.000 description 9
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000003203 everyday effect Effects 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/16—Halides of ammonium
- C01C1/164—Ammonium chloride
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1406—Multiple stage absorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/406—Ammonia
Abstract
The invention relates to a device for preparing solid ammonium chloride from ammonia-containing waste gas, which comprises: one-level absorption tower, second grade absorption tower, acid tank and desiccator contain ammonia waste gas and link to each other through tail gas pipe and one-level absorption tower middle part, the inside top of one-level absorption tower is provided with the annular spraying pipe that sprays the acidizing fluid, annular spraying pipe links to each other with the inside below of one-level absorption tower, one-level absorption tower upper portion be provided with the first blast pipe that is used for the exhaust waste gas and link to each other with second grade absorption tower middle part through first blast pipe, second grade absorption tower upper portion is equipped with the second blast pipe, is equipped with the draught fan that is used for producing the negative pressure on the second blast pipe, the inside top of one-level absorption tower still is provided. The invention also relates to a process for preparing solid ammonium chloride by using the ammonia-containing waste gas of the device. The invention directly converts the ammonia-containing waste gas into industrial solid ammonium chloride, the pollutant emission in the whole process reaches the national environmental protection requirement, and the invention has higher environmental protection and economic benefits.
Description
Technical Field
The invention relates to an ammonia gas recovery technology, in particular to a device and a process for preparing solid ammonium chloride from ammonia-containing waste gas.
Background
In order to reduce environmental pollution, the recycling of aluminum ash, which is slag and floating skin generated during aluminum production, has been a problem which has been receiving attention in recent years. The technical means of scientific recycling of the aluminum ash with fine particles is to prepare the deoxidizer for steelmaking, wherein the key technical problem comprises the removal of nitrogen elements in the aluminum ash, and the existence of the nitrogen elements in the aluminum ash can influence the nitrogen content in steel in the steelmaking process, thereby influencing the quality of the steel, and is an uncontrollable quality factor.
The nitrogen element in the aluminum ash is removed, and ammonia-containing waste gas is generated in the prior art means, so that a new pollution source is formed. The treatment method of the waste gas containing ammonia generally comprises the following steps: absorption and decomposition. The former mainly uses water or dilute acid solution (sulfuric acid or hydrochloric acid) to absorb ammonia-containing waste gas, so that the ammonia-containing waste gas is converted into ammonia water, ammonium sulfate or ammonium chloride. The latter decomposition method decomposes ammonia gas into nitrogen gas and hydrogen gas mainly by the action of a catalyst, but the method has high treatment cost and few manufacturers.
At present, when ammonia-containing waste gas is used for preparing ammonium chloride, the process is that hydrochloric acid is used for absorbing ammonia gas in a spray tower, a sealed acid pool is arranged outdoors for acid circulation of the tower pool, and the ammonia gas is discharged when the content of the ammonium chloride in the acid pool reaches a certain concentration.
Disclosure of Invention
The invention aims to provide a device and a process for preparing solid ammonium chloride from ammonia-containing waste gas, wherein a novel ammonia-containing waste gas circulating absorption device and a novel ammonia-containing waste gas circulating absorption process are designed, so that the whole of acid liquid volatilization and ammonia gas volatilization in the absorption process of the ammonia-containing waste gas is in a closed controllable state, the recovered ammonium chloride is solidified, the pollutant emission in the whole process meets the national environmental protection requirement, and the ammonia gas absorption efficiency is high.
In order to achieve the purpose, the invention adopts the following technical scheme:
an apparatus for preparing solid ammonium chloride from ammonia-containing waste gas, comprising: the system comprises a primary absorption tower, a secondary absorption tower, an acid tank and a dryer, wherein ammonia-containing waste gas from a production line is connected with the middle part of the primary absorption tower through a tail gas pipe, an annular spray pipe used for spraying acid liquor is arranged above the inside of the primary absorption tower, the annular spray pipe is connected with the lower part of the inside of the primary absorption tower through a circulating pump arranged outside the primary absorption tower, a first exhaust pipe used for discharging the waste gas is arranged at the upper part of the primary absorption tower and connected with the middle part of the secondary absorption tower through a first exhaust pipe, a second exhaust pipe is arranged at the upper part of the secondary absorption tower, a draught fan used for generating negative pressure is arranged on the second exhaust pipe and used for discharging the waste gas after secondary purification, and a first spray nozzle is also arranged above the inside of;
a second spray head is arranged above the inner part of the secondary absorption tower, the second spray head is connected with an external water source through a water pump, the lower part of the secondary absorption tower is connected with a first spray head above the inner part of the primary absorption tower through a supplement pipe, and the supplement pipe is provided with a supplement water pump for conveying ammonia-containing liquid to the first spray head;
a volatilization gas pipe is arranged at the upper part of the acid tank and is connected with a first spray head above the inner part of the primary absorption tower through the volatilization gas pipe, the lower part of the acid tank is connected with the lower part of the primary absorption tower through a first pipeline, and a first pump used for conveying acid liquor to the primary absorption tower is arranged on the first pipeline;
the dryer is connected with the primary absorption tower through a second pipeline, and a second pump for conveying the ammonium chloride mother liquor to the dryer is arranged on the second pipeline.
The dryer is a cyclone spray dryer.
The secondary absorption tower is internally provided with a top cap, and the top cap is connected with the first exhaust pipe.
The invention also provides a process for preparing solid ammonium chloride from ammonia-containing waste gas by using the device for preparing solid ammonium chloride from ammonia-containing waste gas, which comprises the following steps:
step S1, firstly, injecting hydrochloric acid with the percentage concentration of 20-25% into the bottom of a primary absorption tower, wherein the liquid level of the hydrochloric acid is lower than the outlet of a tail gas pipe for conveying ammonia-containing waste gas, injecting purified water into a secondary absorption tower, the liquid level of the purified water is higher than the outlet of an exhaust pipe for conveying the ammonia-containing waste gas, arranging a volatilization gas pipe between an acid tank and the primary absorption tower, and exhausting the volatilized hydrochloric acid gas into the primary absorption tower through the volatilization gas pipe, wherein the temperature of the hydrochloric acid volatilized gas is 20-35 ℃;
step S2, starting an acid circulating pump of the primary absorption tower to enable the acid liquor to be sprayed downwards from an annular spraying pipe above the inside of the primary absorption tower; starting a draught fan of the secondary absorption tower to generate negative pressure inside the secondary absorption tower;
step S3, cooling the ammonia-containing waste gas from the production line to 50-75 ℃, inputting the ammonia-containing waste gas into the primary absorption tower through the tail gas pipe, reacting the ammonia-containing waste gas with the sprayed hydrochloric acid to generate an ammonium chloride solution, and controlling the temperature in the primary absorption tower to be lower than 50 ℃ during spraying; if the temperature in the primary absorption tower exceeds 50 ℃, supplementing the liquid in the secondary absorption tower into the primary absorption tower through a supplementing pipeline to cool the primary absorption tower;
step S4, detecting the gas discharged by the secondary absorption tower, and directly discharging the gas if the gas reaches the standard; if the gas of the discharged gas does not reach the standard, starting a water pump to carry out secondary absorption and purification;
s5, detecting the concentration of the ammonium chloride solution at the bottom of the primary absorption tower, and pressurizing and sending the ammonium chloride solution into a cyclone spray dryer to generate a solid industrial ammonium chloride product when the percentage concentration of the ammonium chloride solution reaches 40-50% and the temperature in the primary absorption tower is 40-50 ℃; if the temperature in the first-stage absorption tower exceeds 50 ℃, the liquid containing ammonia in the second-stage absorption tower is supplemented into the first-stage absorption tower through a supplement pipeline, and the first-stage absorption tower is cooled in a spraying mode and participates in the generation reaction of the ammonium chloride.
In the steps S3 and S5, if the liquid in the secondary absorption tower is replenished to the primary absorption tower, the secondary absorption tower is replenished with purified water by a water pump.
The invention has the principle that ammonia-containing waste gas generated in the production process is directly converted into industrial solid ammonium chloride, and pollution of hydrochloric acid volatile gas is eliminated in the preparation process, and the emission of the waste gas reaches the standard basically in the ammonium chloride preparation process, so that the residual ammonia gas in the waste gas is further absorbed and purified by a secondary absorption tower, the emission standard reaching rate can be further ensured, and the temperature of a primary absorption tower is reduced by the secondary absorption tower.
The invention has the beneficial effects that: the invention directly converts the ammonia-containing waste gas generated in the production process into industrial solid ammonium chloride, so that the whole of acid liquid volatilization and ammonia gas volatilization in the absorption process of the ammonia-containing waste gas is in a closed controllable state, and the recovered ammonium chloride is solidified, the pollutant emission in the whole process reaches the national environmental protection requirement, and the ammonia gas absorption efficiency is high, thereby having higher environmental protection and economic benefits.
Drawings
FIG. 1 is a schematic structural diagram of the apparatus of the present invention.
FIG. 2 is a flow chart of the present invention.
In the figure, 1, a first-stage absorption tower, 2, a second-stage absorption tower, 3, an acid tank, 4, a dryer, 5, a tail gas pipe, 6, an annular spray pipe, 7, a circulating pump, 8, a first exhaust pipe, 9, a first spray head, 10, a second spray head, 11, a water pump, 12, a second exhaust pipe, 13, a supplementary pipe, 14, a supplementary water pump, 15, a volatile gas pipe, 16, a first pipeline, 17, a first pump, 18, a second pipeline, 19, a second pump, 20, a top cap, 21 and a draught fan.
Detailed Description
The invention is described in further detail below with reference to the drawings.
As shown in fig. 1, an apparatus for preparing solid ammonium chloride from ammonia-containing waste gas comprises: the device comprises a primary absorption tower 1, a secondary absorption tower 2, an acid tank 3 and a dryer 4, wherein ammonia-containing waste gas from a production line is connected with the middle part of the primary absorption tower 1 through a tail gas pipe 5, an annular spray pipe 6 for spraying acid liquor is arranged above the inside of the primary absorption tower 1, the annular spray pipe 6 is connected with the lower part of the inside of the primary absorption tower 1 through a circulating pump 7 arranged outside the primary absorption tower 1, a first exhaust pipe 8 for exhausting the waste gas is arranged above the primary absorption tower 1 and is connected with the middle part of the secondary absorption tower 2 through the first exhaust pipe 8, a second exhaust pipe 12 is arranged above the secondary absorption tower 2, a draught fan 21 for generating negative pressure is arranged on the second exhaust pipe 12 and is used for exhausting the waste gas after secondary purification, and a first spray nozzle 9 is also arranged above the inside of the primary absorption tower 1;
a second spray head 10 is arranged above the interior of the secondary absorption tower 2, the second spray head 10 is connected with an external water source through a water pump 11, a second exhaust pipe 12 is arranged at the upper part of the secondary absorption tower 2 and used for exhausting waste gas after secondary purification, the lower part of the secondary absorption tower 2 is connected with a first spray head 9 above the interior of the primary absorption tower 1 through a supplement pipe 13, and the supplement pipe 13 is provided with a supplement water pump 14 for conveying ammonia-containing liquid to the first spray head 9;
a volatilization gas pipe 15 is arranged at the upper part of the acid tank 3 and is connected with a first spray head 9 above the inner part of the primary absorption tower 1 through the volatilization gas pipe 15, the lower part of the acid tank 3 is connected with the lower part of the primary absorption tower 1 through a first pipeline 16, and a first pump 17 used for conveying acid liquor to the primary absorption tower 1 is arranged on the first pipeline 16;
the dryer 4 is connected with the first-stage absorption tower 1 through a second pipeline 18, and a second pump 19 for conveying the ammonium chloride mother liquor to the dryer 4 is arranged on the second pipeline 18.
The dryer 4 is a cyclone dryer or a spray dryer.
The secondary absorption tower 2 is internally provided with a top cap 20, and the top cap 20 is connected with the first exhaust pipe 8.
The invention also provides a process for preparing solid ammonium chloride from ammonia-containing waste gas by using the device for preparing solid ammonium chloride from ammonia-containing waste gas, which comprises the following steps as shown in figure 2:
step S1, firstly, injecting hydrochloric acid with the percentage concentration of 20-25% into the bottom of a primary absorption tower, wherein the liquid level of the hydrochloric acid is lower than the outlet of a tail gas pipe for conveying ammonia-containing waste gas, injecting purified water into a secondary absorption tower, the liquid level of the purified water is higher than the outlet of an exhaust pipe for conveying the ammonia-containing waste gas, arranging a volatilization gas pipe between an acid tank and the primary absorption tower, and exhausting the volatilized hydrochloric acid gas into the primary absorption tower through the volatilization gas pipe, wherein the temperature of the hydrochloric acid volatilized gas is 20-35 ℃;
step S2, starting an acid circulating pump of the primary absorption tower to enable the acid liquor to be sprayed downwards from an annular spraying pipe above the inside of the primary absorption tower; starting a draught fan of the secondary absorption tower to generate negative pressure inside the secondary absorption tower;
step S3, cooling the ammonia-containing waste gas from the production line to 50-75 ℃, inputting the ammonia-containing waste gas into the primary absorption tower through the tail gas pipe, reacting the ammonia-containing waste gas with the sprayed hydrochloric acid to generate an ammonium chloride solution, and controlling the temperature in the primary absorption tower to be lower than 50 ℃ during spraying; if the temperature in the primary absorption tower exceeds 50 ℃, supplementing the liquid in the secondary absorption tower into the primary absorption tower through a supplementing pipeline to cool the primary absorption tower;
step S4, detecting the gas discharged by the secondary absorption tower, and directly discharging the gas if the gas reaches the standard; if the gas of the discharged gas does not reach the standard, starting a water pump to carry out secondary absorption and purification;
s5, detecting the concentration of the ammonium chloride solution at the bottom of the primary absorption tower, and pressurizing and sending the ammonium chloride solution into a cyclone spray dryer to generate a solid industrial ammonium chloride product when the percentage concentration of the ammonium chloride solution reaches 40-50% and the temperature in the primary absorption tower is 40-50 ℃; if the temperature in the first-stage absorption tower exceeds 50 ℃, the liquid containing ammonia in the second-stage absorption tower is supplemented into the first-stage absorption tower through a supplement pipeline, and the first-stage absorption tower is cooled in a spraying mode and participates in the generation reaction of the ammonium chloride.
In the steps S3 and S5, if the liquid in the secondary absorption tower is replenished to the primary absorption tower, the secondary absorption tower is replenished with purified water by a water pump.
In one embodiment of the invention, ammonia-containing waste gas discharged by a production line for preparing an oxidant from aluminum ash, which is used for treating thousands of tons of aluminum ash in a day by a certain enterprise, is treated, by arranging the device for preparing solid ammonium chloride from ammonia-containing waste gas provided by the invention and adopting the process for preparing solid ammonium chloride from ammonia-containing waste gas provided by the invention, through continuous operation for 5 months, the standard reaching rate after the waste gas is purified and discharged every day is one hundred percent, and when the production line for preparing the oxidant from the aluminum ash is operated at full load, about 12 tons of solid ammonium chloride can be produced every day.
In conclusion, the device and the process for preparing solid ammonium chloride from ammonia-containing waste gas provided by the invention have the advantages that the whole treatment process of ammonia gas in ammonia-containing tail gas is safe and reliable, the emission of pollutants reaches the national environmental protection requirement, and the device and the process have higher environmental protection and economic benefits.
The present invention is not described in detail in the prior art.
Claims (5)
1. An apparatus for preparing solid ammonium chloride from ammonia-containing waste gas, comprising: one-level absorption tower (1), second grade absorption tower (2), acid tank (3) and desiccator (4), the waste gas that contains ammonia that comes from the production line passes through tail gas pipe (5) and links to each other with one-level absorption tower (1) middle part, and one-level absorption tower (1) inside top is provided with annular shower (6) that are used for spraying acidizing fluid, and annular shower (6) link to each other with one-level absorption tower (1) inside below through setting up at outside circulating pump (7) of one-level absorption tower (1), characterized by: a first exhaust pipe (8) for discharging waste gas is arranged at the upper part of the primary absorption tower (1) and is connected with the middle part of the secondary absorption tower (2) through the first exhaust pipe (8), a second exhaust pipe (12) is arranged at the upper part of the secondary absorption tower (2), a draught fan (21) for generating negative pressure is arranged on the second exhaust pipe (12) and is used for discharging the waste gas after secondary purification, and a first spray head (9) is also arranged above the inner part of the primary absorption tower (1);
a second spray head (10) is arranged above the inner part of the secondary absorption tower (2), the second spray head (10) is connected with an external water source through a water pump (11), the lower part of the secondary absorption tower (2) is connected with a first spray head (9) above the inner part of the primary absorption tower (1) through a supplement pipe (13), and the supplement pipe (13) is provided with a supplement water pump (14) for conveying ammonia-containing liquid to the first spray head (9);
a volatilization gas pipe (15) is arranged at the upper part of the acid tank (3) and is connected with a first spray head (9) above the inner part of the primary absorption tower (1) through the volatilization gas pipe (15), the lower part of the acid tank (3) is connected with the lower part of the primary absorption tower (1) through a first pipeline (16), and a first pump (17) used for conveying acid liquor to the primary absorption tower (1) is arranged on the first pipeline (16);
the dryer (4) is connected with the primary absorption tower (1) through a second pipeline (18), and a second pump (19) used for conveying the ammonium chloride mother liquor to the dryer (4) is arranged on the second pipeline (18).
2. The apparatus for preparing solid ammonium chloride from ammonia-containing waste gas as claimed in claim 1, wherein: the dryer (4) is a cyclone spray dryer.
3. The apparatus for preparing solid ammonium chloride from ammonia-containing waste gas as claimed in claim 1, wherein: the secondary absorption tower (2) is internally provided with a top cap (20), and the top cap (20) is connected with the first exhaust pipe (8).
4. A process for preparing solid ammonium chloride from ammonia-containing waste gas by using the device for preparing solid ammonium chloride from ammonia-containing waste gas as claimed in claim 1-3, which is characterized in that: the process for preparing solid ammonium chloride from ammonia-containing waste gas by using the device for preparing solid ammonium chloride from ammonia-containing waste gas as claimed in claim 1-3, is characterized in that: the method comprises the following steps:
step S1, firstly, injecting hydrochloric acid with the percentage concentration of 20-25% into the bottom of a primary absorption tower, wherein the liquid level of the hydrochloric acid is lower than the outlet of a tail gas pipe for conveying ammonia-containing waste gas, injecting purified water into a secondary absorption tower, the liquid level of the purified water is higher than the outlet of an exhaust pipe for conveying the ammonia-containing waste gas, arranging a volatilization gas pipe between an acid tank and the primary absorption tower, and exhausting the volatilized hydrochloric acid gas into the primary absorption tower through the volatilization gas pipe, wherein the temperature of the hydrochloric acid volatilized gas is 20-35 ℃;
step S2, starting an acid circulating pump of the primary absorption tower to enable the acid liquor to be sprayed downwards from an annular spraying pipe above the inside of the primary absorption tower; starting a draught fan of the secondary absorption tower to generate negative pressure inside the secondary absorption tower;
step S3, cooling the ammonia-containing waste gas from the production line to 50-75 ℃, inputting the ammonia-containing waste gas into the primary absorption tower through the tail gas pipe, reacting the ammonia-containing waste gas with the sprayed hydrochloric acid to generate an ammonium chloride solution, and controlling the temperature in the primary absorption tower to be lower than 50 ℃ during spraying; if the temperature in the primary absorption tower exceeds 50 ℃, supplementing the liquid in the secondary absorption tower into the primary absorption tower through a supplementing pipeline to cool the primary absorption tower;
step S4, detecting the gas discharged by the secondary absorption tower, and directly discharging the gas if the gas reaches the standard; if the gas of the discharged gas does not reach the standard, starting a water pump to carry out secondary absorption and purification;
s5, detecting the concentration of the ammonium chloride solution at the bottom of the primary absorption tower, and pressurizing and sending the ammonium chloride solution into a cyclone spray dryer to generate a solid industrial ammonium chloride product when the percentage concentration of the ammonium chloride solution reaches 40-50% and the temperature in the primary absorption tower is 40-50 ℃; if the temperature in the first-stage absorption tower exceeds 50 ℃, the liquid containing ammonia in the second-stage absorption tower is supplemented into the first-stage absorption tower through a supplement pipeline, and the first-stage absorption tower is cooled in a spraying mode and participates in the generation reaction of the ammonium chloride.
5. The process according to claim 4 for preparing solid ammonium chloride from ammonia-containing waste gas of the apparatus for preparing solid ammonium chloride from ammonia-containing waste gas of claims 1 to 3, wherein: in the steps S3 and S5, if the liquid in the secondary absorption tower is replenished to the primary absorption tower, the secondary absorption tower is replenished with purified water by a water pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010040666.5A CN110963508B (en) | 2020-01-15 | Device and process for preparing solid ammonium chloride from ammonia-containing waste gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010040666.5A CN110963508B (en) | 2020-01-15 | Device and process for preparing solid ammonium chloride from ammonia-containing waste gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110963508A true CN110963508A (en) | 2020-04-07 |
| CN110963508B CN110963508B (en) | 2024-05-14 |
Family
ID=
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103785263A (en) * | 2014-02-14 | 2014-05-14 | 赣州华茂钨材料有限公司 | Ammonia-containing tail gas treatment recycling method |
| CN103894048A (en) * | 2014-04-18 | 2014-07-02 | 中石化南京工程有限公司 | Method for treating low-concentration ammonia-containing tail gas |
| CN109603432A (en) * | 2018-11-29 | 2019-04-12 | 成都虹波钼业有限责任公司 | A kind of ammonia-containing exhaust absorbs the processing method of application |
| CN211712642U (en) * | 2020-01-15 | 2020-10-20 | 河南申越检测技术有限公司 | Device for preparing solid ammonium chloride from ammonia-containing waste gas |
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103785263A (en) * | 2014-02-14 | 2014-05-14 | 赣州华茂钨材料有限公司 | Ammonia-containing tail gas treatment recycling method |
| CN103894048A (en) * | 2014-04-18 | 2014-07-02 | 中石化南京工程有限公司 | Method for treating low-concentration ammonia-containing tail gas |
| CN109603432A (en) * | 2018-11-29 | 2019-04-12 | 成都虹波钼业有限责任公司 | A kind of ammonia-containing exhaust absorbs the processing method of application |
| CN211712642U (en) * | 2020-01-15 | 2020-10-20 | 河南申越检测技术有限公司 | Device for preparing solid ammonium chloride from ammonia-containing waste gas |
Non-Patent Citations (1)
| Title |
|---|
| （苏联）M•E•波任: "《无机盐工艺学》", 化学工业出版社, pages: 288 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9370745B2 (en) | Flue gas-treating method and apparatus for treating acidic tail gas by using ammonia process | |
| CA2908484C (en) | Method and apparatus for treating acidic tail gas by using ammonia process flue gas | |
| KR20010043750A (en) | Process for treating flue gas | |
| CN106241758B (en) | Retracting device and technique for acid waste liquid | |
| CN105536501A (en) | Regeneration method for ferric chloride for denitration | |
| CN201658945U (en) | Sintering smoke purifying system based on heat pipe afterheat recovery technology | |
| CN109364723B (en) | Method for reducing sulfur trioxide in non-ferrous smelting flue gas into sulfur dioxide | |
| CN211712642U (en) | Device for preparing solid ammonium chloride from ammonia-containing waste gas | |
| CN110963508A (en) | Device and process for preparing solid ammonium chloride from ammonia-containing waste gas | |
| CN110963508B (en) | Device and process for preparing solid ammonium chloride from ammonia-containing waste gas | |
| CN208426849U (en) | Exhaust gas processing device is used in a kind of production of toluene two different isocyanates | |
| CN113828117B (en) | Melamine discharging waste gas treatment and recycling system and method | |
| CN110963507A (en) | Ammonia water ammonia production system and process for coke oven flue gas denitration | |
| CN113941225A (en) | Resource method for improving nitric acid dissolved metal tail gas | |
| CN114703332A (en) | System and method for preheating metallurgical furnace charge by using high-temperature molten slag and treating molten slag | |
| CN114288841A (en) | Mannheim method potassium sulfate tail gas processing system | |
| CN110028042B (en) | Method for recycling waste cathode carbon blocks of electrolytic aluminum electrolysis cell | |
| CN215742806U (en) | Ammonia removal device in urea production process | |
| CN112774399A (en) | Tail gas treatment process of uranium-containing denitration fluidized bed in uranium purification | |
| CN106139823B (en) | A kind of comprehensive reutilization method of coal chemical industry transformation condensate liquid stripping tail gas | |
| CN220926685U (en) | Waste sodium hypochlorite recycling acetylene gas treatment system capable of recycling heat energy | |
| CN111003694A (en) | Environment-friendly process for preparing concentrated sulfuric acid by adopting sulfur | |
| CN217855394U (en) | Hydrogen fluoride gas absorbing device | |
| CN102897720A (en) | Recycling method of waste diluted sulfuric acid in sulfuric acid device | |
| CN213141938U (en) | Fine desulfurization system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |