CN114682081A - Dichlorobenzene VOCs tail gas treatment device and use method - Google Patents
Dichlorobenzene VOCs tail gas treatment device and use method Download PDFInfo
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- CN114682081A CN114682081A CN202210382060.9A CN202210382060A CN114682081A CN 114682081 A CN114682081 A CN 114682081A CN 202210382060 A CN202210382060 A CN 202210382060A CN 114682081 A CN114682081 A CN 114682081A
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- 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
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- 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
- B01D53/002—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 condensation
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- 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
- B01D53/1487—Removing organic compounds
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- 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
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- 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
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
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Abstract
The invention discloses a dichlorobenzene VOCs tail gas treatment device and a using method thereof, wherein the dichlorobenzene VOCs tail gas treatment device comprises a chlorobenzene absorption tower, an alkaline washing tower and a cooling mechanism, the chlorobenzene absorption tower, the alkaline washing tower and the cooling mechanism are sequentially connected, the bottom end in the alkaline washing tower is provided with an alkaline solution tank for storing alkaline solution, the alkaline washing tower is connected with an extraction mechanism for extracting the alkaline solution, the extraction mechanism is connected with a spraying mechanism, the spraying mechanism comprises a transverse pipeline, an atomizing spray head and at least two pressing rods, the alkaline washing tower is internally connected with a shielding mechanism for sealing and covering tail gas, the shielding mechanism comprises a lifting disc, at least two exhaust channels, a sealing head, an exhaust port and a spring, the spring is used for driving the sealing head to move towards the direction close to the exhaust port, the sealing head is matched with the pressing rods, and the bottom of the alkaline washing tower is connected with a supplementing mechanism for supplementing the alkaline solution. The invention can avoid alkali liquor waste, realize alkali liquor recycling, improve tail gas purification efficiency and has strong practicability.
Description
Technical Field
The invention relates to the technical field of dichlorobenzene VOCs tail gas treatment, in particular to a dichlorobenzene VOCs tail gas treatment device and a using method thereof.
Background
Dichlorobenzene mainly refers to p-dichlorobenzene and o-dichlorobenzene, is an important fine chemical raw material, and is widely applied to the fields of medicines, pesticides, engineering plastics, solvents, dyes, pigments, mildewproof agents, mothproofing agents, deodorants and the like. VOCs waste gas is also called volatile organic pollutant gas, the national requirement on VOCs emission is increased, VOCs of benzene, toluene and other types are brought into tax collection range, meanwhile, the country and the place make clear regulations on VOCs gas emission, according to the integrated emission Standard of atmospheric pollutants GB16297-1996, the emission index of benzene is 4mg/m3, namely 1.15ppm, and the emission index of chlorobenzene is 50mg/m 3. Therefore, a tail gas treatment device is needed to realize waste gas purification.
When the existing tail gas treatment device is used, the tail gas is usually purified by adopting an alkali liquor spraying mode, part of tail gas can be directly discharged, the purification effect is not obvious enough, and the efficiency is low.
Disclosure of Invention
The invention aims to provide a dichlorobenzene VOCs tail gas treatment device and a using method thereof, which have the advantages of improving the tail gas purification efficiency, realizing obvious effect and realizing the recycling of alkali liquor, and solve the problems that part of tail gas is directly discharged, the purification effect is not obvious enough and the efficiency is lower because the purification is carried out by adopting an alkali liquor spraying mode generally.
In order to achieve the purpose, the invention provides the following technical scheme: a dichlorobenzene VOCs tail gas treatment device comprises a chlorobenzene absorption tower, an alkaline washing tower and a cooling mechanism, wherein the chlorobenzene absorption tower, the alkaline washing tower and the cooling mechanism are sequentially connected, an alkaline solution tank for storing alkaline solution is arranged at the bottom end inside the alkaline washing tower, the alkaline washing tower is connected with an agitating mechanism for agitating the alkaline solution, the agitating mechanism comprises agitating fan blades, the agitating fan blades are arranged in the alkaline solution tank, the alkaline washing tower is connected with an extraction mechanism for extracting the alkaline solution, the extraction mechanism is connected with a spraying mechanism, the spraying mechanism comprises a transverse pipeline, an atomizing head and at least two pressing rods, the atomizing head is connected to the transverse pipeline, the pressing rods are fixed on the transverse pipeline, the alkaline washing tower is internally connected with a shielding mechanism for sealing cover tail gas, the shielding mechanism comprises a lifting disc, at least two exhaust channels, a sealing head, an exhaust port and a spring, and the exhaust channels are arranged on the lifting disc, the exhaust port is communicated with the exhaust channel, the spring is used for driving the sealing head to move towards the direction close to the exhaust port, the sealing head is matched with the pressing rod, and the bottom of the alkaline tower is connected with a supplementing mechanism for supplementing alkaline liquor;
when the lifting disc rises to a proper height, the pressing rod presses the sealing head, and the exhaust channel is communicated.
Preferably, the stirring mechanism further comprises a motor, a supporting bottom plate is fixed to the bottom of the alkaline washing tower, the motor is fixed to a supporting frame connected to the bottom of the supporting bottom plate, and a power output end of the motor is connected with the stirring fan blades.
Preferably, the extraction mechanism includes transfer line, circulating pump, liquid suction pipe, the one end of liquid suction pipe is connected in the lye tank, and the other end links to each other with the lotion end of circulating pump, the flowing back end of circulating pump links to each other with the one end of transfer line, the other end and the horizontal pipeline of transfer line link to each other.
Preferably, the circulation pump is fixed to one side of the caustic tower.
Preferably, shelter from mechanism still includes guide bar, deflector, the deflector is fixed in exhaust passage, the deflector is used for the guide bar direction, sealed head is fixed in the top of guide bar, the spring housing is at the guide bar, and the both ends of spring are fixed continuous with sealed head, deflector respectively.
Preferably, the sealing head is provided with a sealing surface matched with the exhaust port.
Preferably, the replenishing mechanism comprises a liquid replenishing pump and an alkali liquor storage tank, the liquid replenishing pump is fixed on a connecting plate connected in the support frame, the connecting plate is used for supporting the alkali liquor storage tank, the liquid suction end of the liquid replenishing pump is connected with a third pipeline, the third pipeline is connected to the alkali liquor storage tank, the liquid discharge end of the liquid replenishing pump is connected with a liquid feeding pipe, and one end of the liquid feeding pipe is connected with an interface arranged on the alkaline tower.
Preferably, a pH sensor for detecting the pH value of the alkali liquor is installed on the inner side of the alkali liquor tank, and when the detection value is lower than a preset value, the liquid replenishing pump is started to work.
Preferably, the cooling mechanism is used for cooling the tail gas, and comprises a precooler and a liquid nitrogen condenser, wherein the precooler is connected with the top of the alkaline tower, and the output end of the precooler is connected with the liquid nitrogen condenser.
A use method of a dichlorobenzene VOCs tail gas treatment device comprises the following steps:
the method comprises the following steps: high-concentration dichlorobenzene tail gas (800 Nm 3/h) enters a chlorobenzene absorption tower, benzene, p-dichlorobenzene and o-dichlorobenzene in the tail gas are absorbed to a liquid phase by chlorobenzene, and the liquid phase material can be regenerated and recycled;
step two: tail gas (containing chlorobenzene and HCL) from a chlorobenzene absorption tower is sent into an alkali washing tower again and moves from bottom to top, a motor drives stirring blades to stir alkali liquor in an alkali liquor tank, chlorobenzene is fully contacted with the alkali liquor and is neutralized, the lifting disc can be driven to ascend along with the increase of the tail gas blown into the alkali washing tower until a pressing rod presses a sealing head, at the moment, an exhaust passage is conducted, the tail gas is discharged from the exhaust passage, a circulating pump sprays the alkali liquor in the alkali liquor tank from an atomizing head to form fog, the fog is fully contacted with the tail gas, the alkali liquor on the top of the lifting disc flows into the alkali liquor tank again through the exhaust passage, a pH sensor detects the acid-alkali value in the alkali liquor tank, and when the detected value is lower than a preset value, a liquid supplementing pump conveys high-concentration alkali liquor in an alkali liquor storage tank to the alkali liquor tank;
step three: the tail gas rises to the top of the alkaline washing tower and is sequentially conveyed into a precooler and a liquid nitrogen condenser, the chlorobenzene waste gas is cooled to 10 ℃ from 30 ℃ by 5 ℃ of chilled water, then the chlorobenzene waste gas is condensed to-110 ℃ by liquid nitrogen, and the organic matters in the tail gas reach the emission standard and are directly discharged.
Compared with the prior art, the invention has the following beneficial effects: the invention is provided with a stirring mechanism, a shielding mechanism and a spraying mechanism, wherein the stirring mechanism comprises stirring fan blades and a motor, the shielding mechanism comprises a lifting disc, at least two exhaust channels, a sealing head, an exhaust port, a spring, a guide rod and a guide plate, the spraying mechanism comprises a transverse pipeline, an atomizing head and at least two pressing rods, the motor drives the stirring fan blades to rotate so as to realize stirring of alkali liquor and further increase contact with tail gas, HCI in the tail gas is neutralized with the alkali liquor, the pressure in the alkali liquor tank is increased along with the increase of the tail gas in the alkali liquor tank, the lifting disc can be driven to ascend until the pressing rods press the sealing head so as to separate the sealing head from the exhaust port, namely, the exhaust channel is in a conducting state, the purified tail gas is exhausted through the exhaust channel, meanwhile, a circulating pump sprays the alkali liquor in the alkali liquor tank from the atomizing head to form fog water, the fog water is fully combined with the tail gas again so as to neutralize the residual HCI in the tail gas, liquid can flow to the lye tank from exhaust passage in, realize alkali lye cyclic utilization, improve the purification efficiency of tail gas, the effect is showing, also avoids alkali lye extravagant simultaneously, the practicality is strong, and precooler, liquid nitrogen condenser cooling treatment are carried in proper order to tail gas after the purification, discharge at last.
Through being provided with supplementary mechanism, supplementary mechanism includes that make-up pump, alkali lye deposit the jar, and when pH sensor detection numerical value was less than the default, the work is opened to the make-up pump, and in the alkali lye tank was carried to high concentration alkali lye with the alkali lye deposit jar interior alkali lye by the make-up pump promptly, guaranteed that alkali lye is in suitable numerical value in the alkali lye tank, be convenient for to tail gas clean-up, the flexible operation is convenient, realizes automatic operation.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a connection structure of a spraying mechanism and a shielding mechanism according to the present invention;
FIG. 3 is a schematic view of the complementary mechanism of the present invention;
fig. 4 is an enlarged view of a portion a in fig. 2.
In the figure: 1. a chlorobenzene absorption tower; 2. an alkaline washing tower; 3. a precooler; 4. a liquid nitrogen condenser; 5. a transverse duct; 6. a spray head; 7. a pressing lever; 8. a sealing head; 9. an exhaust passage; 10. a lifting plate; 11. a lye tank; 12. a first pipeline; 13. a transfusion tube; 14. a second pipeline; 15. a circulation pump; 16. a pH sensor; 17. a liquid pumping pipe; 18. a liquid feeding pipe; 19. a support base plate; 20. a liquid supplementing pump; 21. an alkali liquor storage tank; 22. a support frame; 23. a stirring fan blade; 24. connecting plates; 25. a motor; 26. a guide plate; 27. an exhaust port; 28. a sealing surface; 29. a guide bar; 30. a spring; 31. a third pipeline; 32. a liquid adding port; 33. an interface.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 4, the invention provides a dichlorobenzene VOCs tail gas treatment device, which comprises a chlorobenzene absorption tower 1, an alkaline washing tower 2 and a cooling mechanism, wherein the chlorobenzene absorption tower 1, the alkaline washing tower 2 and the cooling mechanism are sequentially connected, a pipeline I12 is connected between an exhaust end of the chlorobenzene absorption tower 1 and the alkaline washing tower 2, and tail gas in the chlorobenzene absorption tower 1 is conveniently conveyed to the lower part inside the alkaline washing tower 2 through the pipeline I12. The inside bottom of alkaline tower 2 is provided with the lye tank 11 that is used for depositing alkali lye, and alkaline tower 2 is connected with the rabbling mechanism that is used for the alkali lye stirring, and the rabbling mechanism includes stirring fan blade 23, and stirring fan blade 23 arranges in lye tank 11. Alkaline tower 2 is connected with the extraction mechanism that is used for extracting alkali lye, and extraction mechanism is connected with sprays the mechanism, sprays the mechanism and includes horizontal pipeline 5, atomising head 6, two at least according to depression bar 7, and atomising head 6 is connected in horizontal pipeline 5, is fixed in horizontal pipeline 5 according to depression bar 7 to press depression bar 7 and horizontal pipeline 5 mutually perpendicular, be provided with threely according to depression bar 7 usually. The mechanism that shelters from that is used for closing cap tail gas is connected in the alkaline tower 2, shelter from the mechanism and include lifting disc 10, two at least exhaust passage 9, sealed head 8, gas vent 27, spring 30, lifting disc 10 seals sliding connection in alkaline tower 2 inner wall, exhaust passage 9 sets up in lifting disc 10, gas vent 27 switches on in exhaust passage 9, spring 30 is used for driving sealed head 8 to the direction removal that is close to gas vent 27, sealed head 8 and press the plunger 7 phase-match, the bottom of alkaline tower 2 is connected with the supplementary mechanism that is used for alkali lye to supply.
The motor 25 drives the stirring fan blades 23 to rotate, so that the alkali liquor is stirred, contact between the alkali liquor and the tail gas is increased, HCI in the tail gas and the alkali liquor are neutralized, the tail gas in the alkali liquor tank 11 is increased, namely, the internal pressure of the alkali liquor tank 11 is increased, the lifting disc 10 can be driven to ascend until the pressing rod 7 presses the sealing head 8, the sealing head 8 is separated from the exhaust port 27, namely, the exhaust channel 9 is in a conducting state, the purified tail gas is discharged through the exhaust channel 9, meanwhile, the alkali liquor in the alkali liquor tank 11 is sprayed out from the spraying head 6 by the circulating pump 15 to form fog, the fog is fully combined with the tail gas again, residual HCI in the tail gas is neutralized, the liquid can flow into the alkali liquor tank 11 from the exhaust channel 9, the circulation utilization of the alkali liquor is achieved, the purification efficiency of the tail gas is improved, the effect is remarkable, and waste of the alkali liquor is avoided.
The stirring mechanism further comprises a motor 25, a supporting bottom plate 19 is fixed at the bottom of the alkaline tower 2, the motor 25 is fixed on a supporting frame 22 connected to the bottom of the supporting bottom plate 19, a power output end of the motor 25 is connected with the stirring fan blades 23, and the supporting frame 22 is used for supporting the alkaline tower 2.
The extraction mechanism comprises an infusion tube 13, a circulating pump 15 and an infusion tube 17, one end of the infusion tube 17 is connected to the lye tank 11, the other end of the infusion tube 17 is connected with a washing liquid end of the circulating pump 15, a liquid discharge end of the circulating pump 15 is connected with one end of the infusion tube 13, the other end of the infusion tube 13 is connected with the transverse pipeline 5, the circulating pump 15 pumps alkali liquor in the lye tank 11 to the infusion tube 17 and discharges the alkali liquor from the infusion tube 13, namely the alkali liquor flows to the transverse pipeline 5, and the circulating pump 15 is fixed on one side of the alkali tower 2.
The shielding mechanism further comprises a guide rod 29 and a guide plate 26, the guide plate 26 is fixed in the exhaust channel 9, the guide plate 26 is used for guiding the guide rod 29, the guide rod 29 penetrates through the guide plate 26, meanwhile, the guide rod 29 is in sliding connection with the guide plate 26, the guide plate 26 enables the guide rod 29 to be stably lifted, dislocation between the sealing head 8 and the exhaust port 27 is avoided, the sealing head 8 is fixed at the top of the guide rod 29, the spring 30 is sleeved on the guide rod 29, and two ends of the spring 30 are respectively fixedly connected with the sealing head 8 and the guide plate 26. The thrust of the spring 30 can make the sealing head 8 and the exhaust port 27 firmly connected, and the exhaust gas is prevented from leaking from the exhaust port 27.
The sealing head 8 is provided with a sealing surface 28 matching the exhaust port 27.
The replenishing mechanism comprises a liquid replenishing pump 20, an alkali liquor storage tank 21, the liquid replenishing pump 20 is fixed on a connecting plate 24 connected in a support frame 22, the connecting plate 24 is used for supporting the alkali liquor storage tank 21, a liquid suction end of the liquid replenishing pump 20 is connected with a pipeline III 31, the pipeline III 31 is connected in the alkali liquor storage tank 21, a liquid discharge end of the liquid replenishing pump 20 is connected with a liquid adding pipe 18, one end of the liquid adding pipe 18 is connected with an interface 33 arranged on the alkaline tower 2, the top of the alkali liquor storage tank 21 is provided with a liquid adding opening 32 used for replenishing high-concentration alkali liquor, and the connecting plate 24 is fixedly connected with the alkali liquor storage tank 21.
The pH sensor 16 that is used for detecting alkali lye PH is installed to lye tank 11 inboard, and when detecting the numerical value and being less than the default, the work is opened to fluid infusion pump 20, and in fluid infusion pump 20 carried alkali lye tank 11 with high concentration alkali lye in the alkali lye holding tank 21 promptly, guaranteed that alkali lye is in suitable numerical value in the lye tank 11, is convenient for purify tail gas, and the flexible operation is convenient, realizes automatic operation.
The cooling mechanism is used for cooling tail gas and comprises a precooler 3 and a liquid nitrogen condenser 4, the precooler 3 is connected with the top of the alkaline tower 2, and the output end of the precooler 3 is connected with the liquid nitrogen condenser 4. And the purified tail gas is sequentially conveyed to a precooler 3 and a liquid nitrogen condenser 4 for cooling treatment and finally discharged, and the top of the alkaline tower 2 is connected with the precooler 3 through a second pipeline 14.
A use method of a dichlorobenzene VOCs tail gas treatment device comprises the following steps:
the method comprises the following steps: high-concentration dichlorobenzene tail gas (800 Nm 3/h) enters a chlorobenzene absorption tower 1, benzene, p-dichlorobenzene and o-dichlorobenzene in the tail gas are absorbed to a liquid phase by chlorobenzene, and the liquid phase material can be regenerated and recycled;
step two: tail gas (containing chlorobenzene and HCL) from a chlorobenzene absorption tower 1 is sent into an alkali wash tower 2 again and moves from bottom to top, a motor 25 drives a stirring fan blade 23 to stir alkali liquor in an alkali liquor tank 11, chlorobenzene is fully contacted with the alkali liquor and neutralized, the lifting disc 10 can be driven to ascend as the tail gas blown into the alkali wash tower 2 is increased until a pressing rod 7 presses a sealing head 8, an exhaust passage 9 is conducted at the moment, the tail gas is discharged from an exhaust passage 9 immediately, a circulating pump 15 sprays the alkali liquor in the alkali liquor tank 11 out of an atomizing head 6 to form fog water which is fully contacted with the tail gas, the alkali liquor on the top of the lifting disc 10 flows into the alkali liquor tank 11 again through the exhaust passage 9, a pH sensor 16 detects the acid-alkali value in the alkali liquor tank 11, and when the detected value is lower than a preset value, a liquid replenishing pump 20 conveys high-concentration alkali liquor in an alkali liquor storage tank 21 to the alkali liquor tank 11;
step three: the tail gas rises to the top of an alkaline washing tower 2 and is sequentially conveyed into a precooler 3 and a liquid nitrogen condenser 4, the chlorobenzene waste gas is cooled to 10 ℃ from 30 ℃ by chilled water at 5 ℃, then the chlorobenzene waste gas is condensed to-110 ℃ by liquid nitrogen, the organic matters in the tail gas reach the emission standard and are directly discharged, the traditional compressor refrigeration is replaced by the liquid nitrogen refrigeration, the power consumption is not needed, and the purposes of energy conservation and emission reduction are realized.
The working principle is as follows: high-concentration dichlorobenzene tail gas (800 Nm 3/h) from distillation and reaction firstly enters a chlorobenzene absorption tower 1, benzene, p-dichlorobenzene and o-dichlorobenzene in the tail gas are absorbed to a liquid phase by chlorobenzene, and the liquid phase material can be regenerated and recycled. The tail gas (containing chlorobenzene and HCL) that chlorobenzene absorption tower 1 came out is sent into the bottom of the lower tower of alkaline washing tower 2 through pipeline one 12 again, moves from bottom to top to with alkali lye direct contact in lye tank 11, motor 25 drives stirring fan 23's rotation, makes stirring fan 23 stir the cutting to alkali lye, and then makes the tail gas increase and contact with alkali lye, and HCI in the tail gas neutralizes with alkali lye. Meanwhile, the lower part of the lifting disc 10 is in a sealed state, so that the stay time of tail gas is prolonged, tail gas purification is facilitated, the tail gas in the lye tank 11 is increased, namely the air pressure below the lifting disc 10 is gradually increased, the lifting disc 10 can be driven to ascend until the bottom of the pressing rod 7 presses the sealing head 8, the sealing head 8 is separated from the exhaust port 27, at the moment, the spring 30 is compressed, the exhaust channel 9 is in a conducting state, the tail gas is immediately discharged from the exhaust port 27 through the exhaust channel 9, the lye in the lye tank 11 is conveyed into the transverse pipeline 5 through the lye pumping pipe 17 and the liquid conveying pipe 13 by the circulating pump 15 and then is sprayed out from the spray head 6 to form fog, the fog is fully combined with the tail gas again, and the residual HCI in the tail gas is neutralized. Meanwhile, the alkali liquor on the top of the lifting disc 10 flows into the alkali liquor tank 11 along the air exhaust port 27 and the air exhaust channel 9, so that the alkali liquor is recycled, and waste is avoided. And the tail gas continuously rises and sequentially flows into the precooler 3 and the liquid nitrogen condenser 4 through the second pipeline 14 to cool the tail gas, and organic matters in the tail gas reach the discharge standard and are directly discharged. PH sensor 16 can detect the basicity of alkali lye in lye tank 11, when detecting numerical value and being less than the default, the work is opened to fluid infusion pump 20, fluid infusion pump 20 can pass through pipeline three 31 with the alkali lye of high concentration in the lye storage tank 21, the liquid feeding pipe 18 is pumped to in the lye tank 11, guarantee that the basicity of alkali lye is in suitable numerical value in lye tank 11, be favorable to tail gas clean-up, stirring fan blade 23's rotation simultaneously, be favorable to high concentration alkali lye and alkali lye tank 11 in the alkali lye rapid mixing shake even, therefore, the clothes hanger is strong in practicability.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a dichlorobenzene VOCs tail gas treatment device which characterized in that: the device comprises a chlorobenzene absorption tower (1), an alkaline washing tower (2) and a cooling mechanism, wherein the chlorobenzene absorption tower (1), the alkaline washing tower (2) and the cooling mechanism are sequentially connected, an alkaline solution tank (11) for storing alkaline solution is arranged at the bottom end inside the alkaline washing tower (2), the alkaline washing tower (2) is connected with a stirring mechanism for stirring the alkaline solution, the stirring mechanism comprises stirring fan blades (23), the stirring fan blades (23) are arranged in the alkaline solution tank (11), the alkaline washing tower (2) is connected with an extraction mechanism for extracting the alkaline solution, the extraction mechanism is connected with a spraying mechanism, the spraying mechanism comprises a transverse pipeline (5), a spraying head (6) and at least two pressing rods (7), the spraying head (6) is connected to the transverse pipeline (5), the pressing rods (7) are fixed on the transverse pipeline (5), the alkaline washing tower (2) is internally connected with a shielding mechanism for sealing cover tail gas, the shielding mechanism comprises a lifting disc (10), at least two exhaust channels (9), a sealing head (8), an exhaust port (27) and a spring (30), the exhaust channels (9) are arranged on the lifting disc (10), the exhaust port (27) is communicated with the exhaust channels (9), the spring (30) is used for driving the sealing head (8) to move towards the direction close to the exhaust port (27), the sealing head (8) is matched with the pressing rod (7), and the bottom of the alkaline tower (2) is connected with a supplementing mechanism for supplementing alkaline liquor;
when the lifting disc (10) rises to a proper height, the pressing rod (7) presses the sealing head (8), and the exhaust channel (9) is communicated.
2. The device for treating dichlorobenzene and VOCs tail gas as recited in claim 1, wherein the stirring mechanism further comprises a motor (25), a supporting bottom plate (19) is fixed at the bottom of the alkaline tower (2), the motor (25) is fixed on a supporting frame (22) connected to the bottom of the supporting bottom plate (19), and the power output end of the motor (25) is connected with the stirring fan blades (23).
3. The device for treating dichlorobenzene VOCs tail gas as claimed in claim 1, wherein the extraction mechanism comprises an infusion tube (13), a circulation pump (15) and an extraction tube (17), one end of the extraction tube (17) is connected to the lye tank (11), the other end is connected to the washing liquid end of the circulation pump (15), the liquid discharge end of the circulation pump (15) is connected to one end of the infusion tube (13), and the other end of the infusion tube (13) is connected to the transverse tube (5).
4. The device for treating dichlorobenzene VOCs tail gas as recited in claim 3, wherein the circulating pump (15) is fixed on one side of the alkaline tower (2).
5. The dichlorobenzene VOCs tail gas treatment device according to claim 1, wherein the shielding mechanism further comprises a guide rod (29) and a guide plate (26), the guide plate (26) is fixed in the exhaust channel (9), the guide plate (26) is used for guiding the guide rod (29), the sealing head (8) is fixed on the top of the guide rod (29), the spring (30) is sleeved on the guide rod (29), and two ends of the spring (30) are respectively fixedly connected with the sealing head (8) and the guide plate (26).
6. The dichlorobenzene VOCs tail gas treatment device according to claim 5, wherein the sealing head (8) is provided with a sealing surface (28) matching with the exhaust port (27).
7. The dichlorobenzene VOCs tail gas treatment device according to claim 2, wherein the supplement mechanism comprises a liquid supplement pump (20) and an alkali solution storage tank (21), the liquid supplement pump (20) is fixed on a connecting plate (24) connected in a support frame (22), the connecting plate (24) is used for supporting the alkali solution storage tank (21), a liquid absorption end of the liquid supplement pump (20) is connected with a third pipeline (31), the third pipeline (31) is connected with the alkali solution storage tank (21), a liquid discharge end of the liquid supplement pump (20) is connected with a liquid adding pipe (18), and one end of the liquid adding pipe (18) is connected with an interface (33) arranged on the alkaline washing tower (2).
8. The device for treating the tail gas of the dichlorobenzene and VOCs according to claim 7, wherein a pH sensor (16) for detecting the PH of the alkali liquor is arranged on the inner side of the alkali liquor tank (11), and when the detection value is lower than a preset value, the liquid replenishing pump (20) is started to work.
9. The device for treating dichlorobenzene and VOCs tail gas as claimed in claim 1, wherein the cooling mechanism is used for cooling tail gas, the cooling mechanism comprises a precooler (3) and a liquid nitrogen condenser (4), the precooler (3) is connected with the top of the alkaline tower (2), and the output end of the precooler (3) is connected with the liquid nitrogen condenser (4).
10. The use method of the dichlorobenzene VOCs tail gas treatment device is characterized by comprising the following steps: comprises the following steps:
the method comprises the following steps: high-concentration dichlorobenzene tail gas (800 Nm 3/h) enters a chlorobenzene absorption tower (1), benzene, p-dichlorobenzene and o-dichlorobenzene in the tail gas are absorbed to a liquid phase by chlorobenzene, and the liquid phase material can be regenerated and recycled;
step two: tail gas (containing chlorobenzene and HCL) from a chlorobenzene absorption tower (1) is sent into an alkali washing tower (2) again and moves from bottom to top, a motor (25) drives a stirring fan blade (23) to stir alkali liquor in an alkali liquor tank (11), chlorobenzene is fully contacted with the alkali liquor and neutralized, a lifting disc (10) can be driven to ascend along with the increase of the tail gas blown into the alkali washing tower (2) until a pressing rod (7) presses a sealing head (8), an exhaust channel (9) is conducted at the moment, the tail gas is discharged from the exhaust channel (9), the alkali liquor in the alkali liquor tank (11) is sprayed out from a spray head (6) by a circulating pump (15) to form fog water which is fully contacted with the tail gas, the alkali liquor at the top of the lifting disc (10) flows into the alkali liquor tank (11) again through the exhaust channel (9), a pH sensor (16) detects the acid-base numerical value in the alkali liquor tank (11), and when the detected numerical value is lower than a preset value, the liquid replenishing pump (20) conveys the high-concentration alkali liquor in the alkali liquor storage tank (21) to the alkali liquor tank (11);
step three: the tail gas rises to the top of the alkaline washing tower (2), and is sequentially conveyed into a precooler (3) and a liquid nitrogen condenser (4), the chlorobenzene waste gas is cooled to 10 ℃ from 30 ℃ by chilled water at 5 ℃, and then condensed to-110 ℃ by liquid nitrogen, and organic matters in the tail gas reach the emission standard and are directly discharged.
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