CN110756016A - Neopentyl glycol tail gas emergency treatment device and method - Google Patents
Neopentyl glycol tail gas emergency treatment device and method Download PDFInfo
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- CN110756016A CN110756016A CN201911207961.9A CN201911207961A CN110756016A CN 110756016 A CN110756016 A CN 110756016A CN 201911207961 A CN201911207961 A CN 201911207961A CN 110756016 A CN110756016 A CN 110756016A
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- absorption tower
- pipeline
- tail gas
- neopentyl glycol
- emergency treatment
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- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims description 11
- GETQZCLCWQTVFV-UHFFFAOYSA-N trimethylamine Chemical compound CN(C)C GETQZCLCWQTVFV-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000010521 absorption reaction Methods 0.000 claims description 179
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 36
- 239000000243 solution Substances 0.000 claims description 35
- 239000007864 aqueous solution Substances 0.000 claims description 28
- 238000001816 cooling Methods 0.000 claims description 18
- 239000002253 acid Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000013505 freshwater Substances 0.000 claims description 13
- 239000000945 filler Substances 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 5
- 238000006386 neutralization reaction Methods 0.000 claims description 4
- 238000004064 recycling Methods 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 3
- 230000003472 neutralizing effect Effects 0.000 claims description 2
- 238000009423 ventilation Methods 0.000 claims description 2
- 238000000746 purification Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 76
- AMIMRNSIRUDHCM-UHFFFAOYSA-N Isopropylaldehyde Chemical compound CC(C)C=O AMIMRNSIRUDHCM-UHFFFAOYSA-N 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000000622 irritating effect Effects 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- 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
- B01D53/1493—Selection of liquid materials for use as absorbents
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/50—Inorganic acids
- B01D2251/506—Sulfuric acid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
- B01D2252/103—Water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
Abstract
The application discloses neopentyl glycol tail gas emergency treatment device relates to neopentyl glycol tail gas treatment technical field. This application is through providing a neopentyl glycol tail gas emergency treatment device, is connected with the exhaust port of neopentyl glycol device, stops when burning furnace breaks down for a short time, can discharge the condition of neopentyl glycol emergency stop to the atmosphere after can reaching standard with tail gas discharge channel automatic switch-over to this emergency treatment device, with trimethylamine content purification in the neopentyl glycol tail gas.
Description
Technical Field
The application relates to the technical field of neopentyl glycol tail gas treatment, in particular to an emergency treatment device and method for neopentyl glycol tail gas.
Background
The neopentyl glycol tail gas contains components such as formaldehyde, isobutyraldehyde, trimethylamine, hydrogen and the like, and is sent to an incinerator for thermal incineration under the normal production condition. If the incinerator breaks down and stops for a short time in the production process, and the neopentyl glycol device is still normally produced, the condition that the neopentyl glycol device stops emergently due to the fact that tail gas cannot be processed occurs.
In order to ensure that the neopentyl glycol plant is kept running without being affected by the temporary shutdown of the incinerator, there are three conventional methods for tail gas treatment:
firstly, directly discharging tail gas into the atmosphere. And (4) the incinerator breaks down, tail gas is automatically switched to be discharged to the air, and the tail gas is directly discharged to the atmosphere. The disadvantages are as follows: because the tail gas contains trimethylamine which is fishy odor with a very low odor threshold, the peripheral concentration limit value is 0.05mg/m3The main harm to the human body is the irritating effect on the eyes, nose, throat and respiratory tract, and the discharge to the atmosphere causes serious environmental problems. In addition, the tail gas contains hydrogen, and safety accidents can be caused by high-speed direct emptying.
And secondly, two incinerators are arranged, one incinerator is used, and the other incinerator is used, and if one incinerator fails, tail gas is automatically switched to the other incinerator. The disadvantages are as follows: large investment and high operating cost, and needs to supplement a large amount of fuel gas to maintain the spare incinerator in a gas receiving state at any time.
And thirdly, when the incinerator fails, the tail gas is automatically switched to a torch for treatment. The disadvantages are as follows: the combustion temperature of the torch is low, which is not enough to burn the trimethylamine completely, and the risk of environmental pollution is also existed.
In order to deal with the emergency situation that the incinerator is stopped in a short time due to faults, a neopentyl glycol tail gas emergency treatment device and a neopentyl glycol tail gas emergency treatment method are required to be provided.
Disclosure of Invention
The utility model provides a neopentyl glycol emergency treatment device solves and burns burning furnace and breaks down the neopentyl glycol tail gas processing problem when parking for a short time.
In order to achieve the above purpose, the embodiments of the present application adopt the following technical solutions: a neopentyl glycol tail gas emergency treatment device is connected with a first pipeline that draws from the tail gas discharge port of neopentyl glycol device includes: one end of the second pipeline is connected with the first pipeline, the other end of the second pipeline is connected with the incinerator, and a first electromagnetic valve is arranged on the second pipeline; one end of the third pipeline is connected with the first pipeline, a second electromagnetic valve is arranged on the third pipeline, and the first electromagnetic valve and the second electromagnetic valve are electrically connected with the incinerator; the bottom of the first absorption tower is connected with the other end of the third pipeline; one end of the fourth pipeline is connected with the top end of the first absorption tower; the bottom of the second absorption tower is connected with the other end of the fourth pipeline; one end of the fifth pipeline is connected with the top end of the second absorption tower; the bottom of the third absorption tower is connected with the other end of the fifth pipeline; and the sixth pipeline is arranged at the top end of the third absorption tower and used for discharging the tail gas reaching the standard to the atmosphere.
Among the above-mentioned technical scheme, this application embodiment is connected with the exhaust vent of neopentyl glycol device through proposing a neopentyl glycol tail gas emergency treatment device, when burning furnace break down and stop for a short time, can discharge to the atmosphere after the trimethylamine content purification up to standard in the neopentyl glycol tail gas with exhaust vent automatic switch-over to this emergency treatment device, has avoided the condition of neopentyl glycol emergency stop. The first electromagnetic valve and the second electromagnetic valve can control automatic switching of a neopentyl glycol tail gas conveying channel, under a normal condition, the first electromagnetic valve is in an open state, the second electromagnetic valve is in a closed state, and tail gas enters the incinerator through the second pipeline for incineration treatment; when burning furnace breaks down and temporarily parks, send the signal of telecommunication for first solenoid valve and second solenoid valve, control first solenoid valve and close and the second solenoid valve is opened, make tail gas pass through the third pipeline and get into a neopentyl glycol tail gas emergency treatment device in this application. Finally, after the neopentyl glycol tail gas is absorbed by the first absorption tower, the second absorption tower and the third absorption tower, the trimethylamine concentration is lower than 0.05mg/m3(GB14554-93), can be discharged to the atmosphere directly through the sixth pipeline, without polluting the environment.
Further, according to the embodiment of the present application, wherein the first absorption tower, the second absorption tower and the third absorption tower are packed absorption towers.
Further, according to the embodiment of the application, the first absorption tower and the second absorption tower are water absorption towers.
Further, according to the embodiment of the present application, wherein the third absorption tower is an acid absorption tower.
Further, according to the embodiment of the application, an aqueous solution circulating system is arranged between the first absorption tower and the second absorption tower, and the aqueous solution is input from the upper part of the second absorption tower.
Further in accordance with an embodiment of the present application, wherein the aqueous solution circulation system comprises: the seventh pipeline is arranged at the bottom of the second absorption tower; one end of the eighth pipeline is connected with the seventh pipeline, and the other end of the eighth pipeline is connected with the middle part of the second absorption tower; one end of the ninth pipeline is connected with the seventh pipeline, and the other end of the ninth pipeline is connected with the middle part of the first absorption tower; and the tenth pipeline is arranged at the bottom of the first absorption tower and is communicated with the ninth pipeline.
Further, according to the embodiment of the present application, wherein the third absorption tower comprises: the eleventh pipeline is arranged at the bottom of the third absorption tower; and the sulfuric acid barrel is connected with the eleventh pipeline.
Further, according to the embodiment of the application, a twelfth pipeline is further arranged at the bottom end of the third absorption tower, and the other end of the twelfth pipeline is connected to the middle part of the third absorption tower.
Further, according to the embodiment of the present application, wherein the height of the sixth pipeline is greater than 15 m.
Further, according to the embodiment of the application, the bottoms of the first absorption tower, the second absorption tower and the third absorption tower are respectively provided with the first cooling device, the second cooling device and the third cooling device.
In order to achieve the purpose, the embodiment of the application also discloses a neopentyl glycol tail gas emergency treatment method, which is characterized by being used for the condition that an incinerator is stopped for a short time due to failure, and comprising the following steps of:
the ventilation pipeline is switched, the electric signal from the incinerator is received, the first electromagnetic valve is controlled to be closed, the second electromagnetic valve is controlled to be opened, and tail gas enters the bottom of the first absorption tower through the third pipeline;
the water solution circulation, namely inputting quantitative fresh water solution from the upper part of the second absorption tower, dividing the fresh water solution into two paths through a seventh pipeline, conveying one path of the fresh water solution back to the middle part of the second absorption tower through an eighth pipeline, and conveying the other path of the fresh water solution to the middle part of the first absorption tower through a ninth pipeline;
first-stage absorption, wherein tail gas and aqueous solution are in reverse contact through a filler in a tower of a first absorption tower, and trimethylamine in the tail gas is absorbed into the aqueous solution;
secondary absorption, wherein the rest tail gas enters the bottom of a second absorption tower through a fourth pipeline, and reversely contacts with a fresh aqueous solution through a filler, and trimethylamine in the rest tail gas is absorbed into the aqueous solution;
acid washing and neutralizing, wherein tail gas from the second absorption tower enters the bottom of a third absorption tower through a fifth pipeline, and is neutralized with an acid solution through filler countercurrent to remove residual trimethylamine;
and (4) emptying, and discharging the treated tail gas into the atmosphere through a sixth pipeline at the top end of the third absorption tower.
Further, according to the embodiment of the application, in the aqueous solution circulation step, the aqueous solution at the bottom of the first absorption tower is conveyed back to the first absorption tower through a tenth pipeline and a ninth pipeline for recycling.
Further, according to the embodiment of the present application, in the acid washing neutralization step, the acid solution is a dilute sulfuric acid solution, is stored in a sulfuric acid bucket, and is transported to the bottom of the third absorption tower through an eleventh pipeline, and the dilute sulfuric acid solution at the bottom of the third absorption tower is transported back to the middle of the third absorption tower through a twelfth pipeline.
Compared with the prior art, the method has the following beneficial effects:
(1) this application is through providing a neopentyl glycol tail gas emergency treatment device, is connected with the exhaust port of neopentyl glycol device, stops when burning furnace breaks down for a short time, can discharge the condition of neopentyl glycol emergency stop to the atmosphere after can reaching standard with tail gas discharge channel automatic switch-over to this emergency treatment device, with trimethylamine content purification in the neopentyl glycol tail gas.
(2) The neopentyl glycol tail gas conveying channel is controlled to be automatically switched through a first electromagnetic valve and a second electromagnetic valve, under a normal condition, the first electromagnetic valve is in an open state, the second electromagnetic valve is in a closed state, and tail gas enters the incinerator through a second pipeline for incineration treatment; when burning furnace breaks down and temporarily parks, send the signal of telecommunication for first solenoid valve and second solenoid valve, control first solenoid valve and close and the second solenoid valve is opened, make tail gas pass through the third pipeline and get into a neopentyl glycol tail gas emergency treatment device in this application.
(3) After neopentyl glycol tail gas is absorbed by the first absorption tower, the second absorption tower and the third absorption tower, the concentration of trimethylamine is lower than 0.05mg/m3(GB14554-93), can be discharged to the atmosphere directly through the sixth pipeline, without polluting the environment.
Drawings
The present application is further described below with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of a neopentyl glycol tail gas emergency treatment device in the application.
In the attached drawings
1. Incinerator 2, first electromagnetic valve 3 and second electromagnetic valve
4. A first absorption tower 5, a second absorption tower 6 and a third absorption tower
7. First cooling device 8, second cooling device 9, third cooling device
10. Dilute sulfuric acid barrel 11, first pipeline 12 and second pipeline
13. Third pipeline 14, fourth pipeline 15, fifth pipeline
16. Sixth, seventh, and eighth ducts 17, 18, and 18
19. Ninth duct 20, tenth duct 21, eleventh duct
22. Twelfth pipeline
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clear and fully described, embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of some embodiments of the invention and are not limiting of the invention, and that all other embodiments obtained by those of ordinary skill in the art without the exercise of inventive faculty are within the scope of the invention.
In the description of the present invention, it should be noted that the terms "center", "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, and a specific orientation configuration and operation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "a," "an," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
For the purposes of simplicity and explanation, the principles of the embodiments are described by referring mainly to examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. It will be apparent, however, to one skilled in the art that the embodiments may be practiced without these specific details. In some instances, well-known methods and structures have not been described in detail so as not to unnecessarily obscure the embodiments. In addition, all embodiments may be used in combination with each other.
Fig. 1 shows a neopentyl glycol tail gas emergency treatment device's in this application concrete structure, is connected with the tail gas discharge port of neopentyl glycol device, when burning furnace breaks down and stops for a short time, can with tail gas discharge channel automatic switch-over to this emergency treatment device, discharges to the atmosphere after the trimethylamine content purification in the neopentyl glycol tail gas reaches standard, has avoided the condition of neopentyl glycol emergency stop.
As shown in fig. 1, a first pipeline 11 led out from a tail gas discharge port of a neopentyl glycol device is divided into two paths, wherein one path is a second pipeline 12 and is connected with an incinerator 1, and a first electromagnetic valve 2 is arranged on the second pipeline 12; another way is third pipeline 13, connects this application a neopentyl glycol tail gas emergency treatment device, be provided with second solenoid valve 3 on third pipeline 13, burn burning furnace 1 and be connected with first solenoid valve 2 and second solenoid valve 3. According to the neopentyl glycol tail gas incineration treatment system, the automatic switching of a neopentyl glycol tail gas conveying channel is controlled by arranging the first electromagnetic valve 2 and the second electromagnetic valve 3, under a normal condition, the first electromagnetic valve 2 is in an open state, the second electromagnetic valve 3 is in a closed state, and tail gas enters the incinerator 1 through the second pipeline 12 to be incinerated; when burning furnace 1 and breaking down the short time and stopping, send the signal of telecommunication for first solenoid valve 2 and second solenoid valve 3, control first solenoid valve 2 and close and second solenoid valve 3 opens, make tail gas pass through third pipeline 13 and get into a neopentyl glycol tail gas emergency treatment device of this application.
The application a neopentyl glycol tail gas emergency treatment device, including first absorption tower 4, second absorption tower 5 and third absorption tower 6. A third pipe 13 is connected to the bottom of the second absorption tower 4 and feeds the off gas to the first absorption tower 4. The top end of the first absorption tower 4 is connected with the bottom of the second absorption tower 5 through a fourth pipeline 14, so that the residual tail gas after absorption treatment of the first absorption tower 4 enters the bottom of the second absorption tower 5 from the top end of the first absorption tower 4. The top end of the second absorption tower 5 is connected with the bottom of the third absorption tower 6 through a fifth pipeline 15, so that the residual tail gas after absorption treatment by the second absorption tower 5 enters the third absorption tower from the top end of the second absorption tower 5. And finally, a sixth pipeline 16 is arranged at the top end of the third absorption tower 5, and the tail gas after treatment reaches the standard is discharged to the atmosphere.
Wherein, the first absorption tower 4, the second absorption tower 5 and the third absorption tower 6 are all packing absorption towers. The first absorption tower 4 and the second absorption tower 5 are water absorption towers, and an aqueous solution needs to be introduced into the first absorption tower 4, and fresh water needs to be introduced into the second absorption tower 5. The third absorption tower 5 is an acid absorption tower, and an acid solution needs to be introduced into the third absorption tower 6.
Specifically, in this embodiment, a certain amount of fresh water is fed from the upper part of the second absorption tower 5, and is in counter-current contact with the residual tail gas from the first absorption tower through the packing in the second absorption tower 5, so as to absorb the trimethylamine in the residual tail gas into the aqueous solution. The bottom end of the second absorption tower 5 is provided with a seventh pipeline 17, and the seventh pipeline 17 is used for discharging the aqueous solution which is subjected to primary absorption and positioned at the bottom of the second absorption tower 5 out of the second absorption tower 5. The end of the seventh pipeline 17 is divided into two paths, one path is an eighth pipeline 18, the eighth pipeline 18 is communicated to the middle part of the second absorption tower 5, and part of the water solution after primary absorption is conveyed back to the second absorption tower 5 for secondary utilization; the other path is a ninth pipeline 19, the ninth pipeline 19 is communicated to the middle part of the first absorption tower 4, the rest part of the water solution subjected to primary absorption is conveyed to the first absorption tower, the water solution is in reverse contact with neopentyl glycol tail gas in the tower of the first absorption tower 4 through a filler, and trimethylamine in the tail gas is absorbed into the water solution. At the bottom end of the first absorption tower 4, a tenth pipe 20 is provided, and the tenth pipe 20 is used for discharging the aqueous solution subjected to the secondary absorption at the bottom of the first absorption tower 4 out of the first absorption tower 4. The end of the tenth pipe 20 is connected to the ninth pipe 19, and the aqueous solution after the second absorption is sent back to the first absorption tower 4 for the third utilization. By arranging the water solution circulating pipeline system, the absorption effect of water on trimethylamine can be fully utilized, and the condition that the trimethylamine and organic matters in neopentyl glycol tail gas can be fully absorbed by the water is ensured. In the application, the trimethylamine content absorbed in the first absorption tower 4 is far greater than that absorbed in the second absorption tower 5, so that fresh water cannot be fully utilized after being injected from the second absorption tower 5, the seventh pipeline 17, the eighth pipeline 18 and the ninth pipeline section 19 are arranged for secondary utilization, and the tenth pipeline 20 is arranged for tertiary utilization, so that the waste of water resources is greatly reduced.
In the application, an eleventh pipeline 21 is arranged at the bottom of a third absorption tower 6, the eleventh pipeline 21 is connected with a sulfuric acid barrel 10, a dilute sulfuric acid solution is contained in the sulfuric acid barrel 10, the dilute sulfuric acid solution is conveyed into the third absorption tower 6 through the eleventh pipeline, and is neutralized with tail gas from a second absorption tower 5 to remove residual trimethylamine. A twelfth pipeline 22 is arranged at the bottom end of the third absorption tower 6, and the other end of the twelfth pipeline 22 is connected with the middle part of the third absorption tower 6, so that the dilute sulfuric acid solution can be used for multiple times.
After twice water solution absorption and once acid solution neutralization, the concentration of trimethylamine in the neopentyl glycol tail gas is lower than 0.05mg/m3(GB14554-93), reach the emission standard, finally discharge into the atmosphere through the sixth pipeline 16 at the top of the third absorption tower 6, the height of the sixth pipeline 16 is more than 15 m.
In the neopentyl glycol tail gas emergency treatment device, a first cooling device 7, a second cooling device 8 and a third cooling device 9 are respectively arranged at the bottoms of a first absorption tower 4, a second absorption tower 5 and a third absorption tower 6, the first cooling device 7, the second cooling device 8 and the third cooling device 9 are cooled by cooling water, the first cooling device 7 and the second cooling device are used for keeping the temperature of circulating liquid at 30-35 ℃, and the third cooling device 9 is used for keeping the temperature of the circulating liquid below 35 ℃.
Finally, the embodiment of the application also discloses a neopentyl glycol tail gas emergency treatment method, which is used for the condition that the incinerator 1 is stopped in a short time when a fault occurs, and comprises the following steps:
switching an air duct, receiving an electric signal from the incinerator 1, controlling the first electromagnetic valve 2 to close and the second electromagnetic valve 3 to open, and enabling tail gas to enter the bottom of the first absorption tower 4 through a third duct 13;
the aqueous solution is circulated, quantitative fresh water is input from the upper part of the second absorption tower 5 and is divided into two paths through a seventh pipeline 17, one path is conveyed back to the middle part of the second absorption tower 5 through an eighth pipeline 18, and the other path is conveyed to the middle part of the first absorption tower 4 through a ninth pipeline 19; the aqueous solution at the bottom of the first absorption tower 4 is conveyed back to the first absorption tower 4 for recycling through a tenth pipeline 20 and a ninth pipeline 19;
primary absorption, namely reversely contacting neopentyl glycol tail gas and an aqueous solution in a tower of a first absorption tower 4 through a filler, and absorbing trimethylamine in the tail gas into the aqueous solution;
secondary absorption, wherein the residual tail gas enters the bottom of a second absorption tower 5 through a fourth pipeline 14 and is in reverse contact with fresh water through a filler, and trimethylamine in the residual tail gas is absorbed into an aqueous solution;
acid washing neutralization, wherein tail gas from the second absorption tower 5 enters the bottom of the third absorption tower 6 through a fifth pipeline 15, and is neutralized with an acid solution through filler countercurrent to remove residual trimethylamine; wherein, the acid solution is a dilute sulfuric acid solution, is stored in a sulfuric acid barrel 10 and is conveyed to the bottom of the third absorption tower 6 through an eleventh pipeline 21, and the dilute sulfuric acid solution at the bottom of the third absorption tower 6 is conveyed back to the middle part of the third absorption tower 6 through a twelfth pipeline;
and exhausting the tail gas after treatment to the atmosphere at the top end of the third absorption tower 6 through a sixth pipeline 16.
Although the illustrative embodiments of the present application have been described above to enable those skilled in the art to understand the present application, the present application is not limited to the scope of the embodiments, and various modifications can be made by those skilled in the art without departing from the spirit and scope of the present application as defined and defined by the appended claims.
Claims (13)
1. The utility model provides a neopentyl glycol tail gas emergency treatment device, with the first pipe connection of drawing forth from the tail gas discharge port of neopentyl glycol device which characterized in that includes:
one end of the second pipeline is connected with the first pipeline, the other end of the second pipeline is connected with the incinerator, and a first electromagnetic valve is arranged on the second pipeline;
one end of the third pipeline is connected with the first pipeline, a second electromagnetic valve is arranged on the third pipeline, and the first electromagnetic valve and the second electromagnetic valve are connected with the incinerator;
the bottom of the first absorption tower is connected with the other end of the third pipeline;
one end of the fourth pipeline is connected with the top end of the first absorption tower;
the bottom of the second absorption tower is connected with the other end of the fourth pipeline;
one end of the fifth pipeline is connected with the top end of the second absorption tower;
the bottom of the third absorption tower is connected with the other end of the fifth pipeline;
and the sixth pipeline is arranged at the top end of the third absorption tower and used for discharging the tail gas reaching the treatment standard to the atmosphere.
2. The neopentyl glycol tail gas emergency treatment device of claim 1, wherein the first absorption tower, the second absorption tower and the third absorption tower are packed absorption towers.
3. The neopentyl glycol tail gas emergency treatment device according to claim 1, wherein the first absorption tower and the second absorption tower are water absorption towers.
4. The neopentyl glycol tail gas emergency treatment device according to claim 1, wherein the third absorption tower is an acid absorption tower.
5. The neopentyl glycol tail gas emergency treatment device according to claim 1, wherein an aqueous solution circulation system is arranged between the first absorption tower and the second absorption tower, and an aqueous solution is input from the upper part of the second absorption tower.
6. The neopentyl glycol exhaust emergency treatment device according to claim 5, wherein the aqueous solution circulation system comprises:
a seventh pipe disposed at the bottom of the second absorption tower;
one end of the eighth pipeline is connected with the seventh pipeline, and the other end of the eighth pipeline is connected with the middle part of the second absorption tower;
a ninth pipe, one end of which is connected with the seventh pipe and the other end of which is connected with the middle part of the first absorption tower;
a tenth pipe provided at the bottom of the first absorption tower, the tenth pipe communicating with the ninth pipe.
7. The neopentyl glycol off-gas emergency treatment device according to claim 1, wherein the third absorption tower comprises:
an eleventh pipe disposed at the bottom of the third absorption tower;
a sulfuric acid bucket, the sulfuric acid bucket with the eleventh pipe connection.
8. The neopentyl glycol tail gas emergency treatment device according to claim 7, wherein a twelfth pipeline is further arranged at the bottom end of the third absorption tower, and the other end of the twelfth pipeline is connected to the middle part of the third absorption tower.
9. The neopentyl glycol exhaust emergency treatment device according to claim 1, wherein the height of the sixth pipeline is greater than 15 m.
10. The neopentyl glycol tail gas emergency treatment device according to claim 1, wherein the bottoms of the first absorption tower, the second absorption tower and the third absorption tower are respectively provided with a first cooling device, a second cooling device and a third cooling device.
11. A neopentyl glycol tail gas emergency treatment method is characterized by being used for a condition that an incinerator is stopped for a short time when a fault occurs, and comprising the following steps of:
the switching ventilation pipeline receives an electric signal from the incinerator, controls the first electromagnetic valve to be closed and controls the second electromagnetic valve to be opened, and enables tail gas to enter the bottom of the first absorption tower through the third pipeline;
the water solution circulation, namely inputting quantitative fresh water solution from the upper part of the second absorption tower, dividing the fresh water solution into two paths through a seventh pipeline, conveying one path of the fresh water solution back to the middle part of the second absorption tower through an eighth pipeline, and conveying the other path of the fresh water solution to the middle part of the first absorption tower through a ninth pipeline;
primary absorption, wherein the tail gas and the aqueous solution are in reverse contact through a packing in the tower of the first absorption tower, and trimethylamine in the tail gas is absorbed into the aqueous solution;
performing secondary absorption, wherein the rest of the tail gas enters the bottom of the second absorption tower through a fourth pipeline, and reversely contacts with the fresh aqueous solution through a filler, and trimethylamine in the rest of the tail gas is absorbed into the aqueous solution;
acid washing and neutralizing, wherein tail gas from the second absorption tower enters the bottom of a third absorption tower through a fifth pipeline, and is neutralized with an acid solution through filler countercurrent to remove residual trimethylamine;
and exhausting the tail gas after treatment into the atmosphere at the top end of the third absorption tower through a sixth pipeline.
12. The neopentyl glycol off-gas emergency treatment method according to claim 11, wherein in the aqueous solution recycling step, the aqueous solution at the bottom of the first absorption tower is conveyed back to the first absorption tower for recycling through a tenth pipeline and the ninth pipeline.
13. The neopentyl glycol tail gas emergency treatment method according to claim 11, wherein in the acid washing neutralization step, the acid solution is a dilute sulfuric acid solution, is stored in a sulfuric acid bucket and is conveyed to the bottom of the third absorption tower through an eleventh pipeline, and the dilute sulfuric acid solution at the bottom of the third absorption tower is conveyed back to the middle of the third absorption tower through a twelfth pipeline.
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