CN215916959U

CN215916959U - Novel exhaust purification recovery plant is used in nitrocotton production

Info

Publication number: CN215916959U
Application number: CN202122581629.8U
Authority: CN
Inventors: 韩庆荣; 李丽丽; 曹晓霞; 许青梅
Original assignee: Gansu Chemical Industry Research Institute Co ltd
Current assignee: Gansu Chemical Industry Research Institute Co ltd
Priority date: 2021-10-26
Filing date: 2021-10-26
Publication date: 2022-03-01
Anticipated expiration: 2031-10-26

Abstract

The utility model discloses a novel waste gas purifying and recycling device for nitrocotton production, which comprises an air inlet pipe and a dust filter, wherein the air inlet pipe is arranged at the left end of the dust filter, the right side of the dust filter is provided with a micro-nano bubble high-energy oxidation tower, a new purifying treatment step is added in the purifying treatment process of the waste gas purifying and recycling device for nitrocotton production, namely, the treated gas is purified again through a novel back washing treatment device, and the purified gas can effectively purify harmful substances such as n-butyl alcohol, isopropanol and the like which are not completely treated in the waste gas after being purified again through the back washing treatment device, so that the condition that the purified gas contains trace n-butyl alcohol, isopropanol and other harmful substances to harm the environment and human health can be avoided, and the purifying effect of the whole waste gas purifying and recycling device for nitrocotton production can be improved, meanwhile, the protection to the emission environment can be increased.

Description

Novel exhaust purification recovery plant is used in nitrocotton production

Technical Field

The utility model belongs to the technical field of waste gas purification and recovery, and particularly relates to novel waste gas purification and recovery equipment for nitrocotton production.

Background

The waste gas purification mainly refers to the work of treating the industrial waste gas generated in industrial places such as dust particles, smoke and dust, peculiar smell gas and toxic and harmful gas, and the common waste gas purification includes factory smoke and waste gas purification, workshop dust and waste gas purification, organic waste gas purification, waste gas peculiar smell purification, acid-base waste gas purification, chemical waste gas purification and the like.

The existing waste gas purification and recovery equipment for nitrocotton production has the following problems: the existing waste gas purification and recovery equipment for nitrocotton production mainly purifies waste gas generated during nitrocotton production, so that the gas after purification can meet health standards and discharge standards, and because the waste gas in the production of nitrocotton can contain harmful substances such as n-butyl alcohol, isopropanol and the like, trace n-butyl alcohol and isopropanol can be contained in the purified gas after the traditional purification and recovery process, and although the purified gas reaches the discharge and health standards, the trace n-butyl alcohol and isopropanol still can affect the health of an inhalator, so that equipment capable of completely purifying the waste gas is urgently needed to enable the purified gas to be healthier and cleaner.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide novel waste gas purification and recovery equipment for nitrocotton production, which aims to solve the problems that after the traditional purification and recovery process proposed in the background art, purified gas contains trace n-butanol and isopropanol, and although the purified gas reaches the emission and health standards, the trace n-butanol and isopropanol still have influence on the health of an inhalator.

In order to achieve the purpose, the utility model provides the following technical scheme: a novel waste gas purification and recovery device for nitrocotton production comprises an air inlet pipe and a dust filter, wherein the air inlet pipe is installed at the left end of the dust filter, a micro-nano bubble high-energy oxidation tower is arranged on the right side of the dust filter, a low-temperature plasma waste gas treatment tower is arranged on the right side of the micro-nano bubble high-energy oxidation tower, a UV (ultraviolet) processor is arranged on the right side of the low-temperature plasma waste gas treatment tower, a back flush treatment device is arranged on the right side of the UV processor, the dust filter, the micro-nano bubble high-energy oxidation tower, the low-temperature plasma waste gas treatment tower, the UV processor and the back flush treatment device are communicated and connected with each other through conveying pipe heads, maintenance doors are arranged on the outer walls of the front ends, close to the lower side, of the back flush treatment device, and a recovery pipe head is arranged on the outer wall of the upper end, close to the right side, the back flush treatment device comprises an L-shaped gas pipe, a first flushing chamber, a second flushing chamber and a third flushing chamber, wherein the first flushing chamber, the second flushing chamber and the third flushing chamber are sequentially arranged in the back flush treatment box from left to right, the first flushing chamber, the second flushing chamber and the third flushing chamber are close to the inner wall of the left end of the upper side and are all provided with the L-shaped gas pipe, the lower ends of the L-shaped gas pipe are respectively arranged at the upper sides of the first flushing chamber, the second flushing chamber and the third flushing chamber, the upper sides of the inner walls of the lower ends are close to the upper sides of the inner walls of the upper ends, the first flushing chamber is communicated with the conveying pipe through the L-shaped gas pipe, and the inside of a recovery pipe head is communicated with the inside of the top ends of the three flushing chambers.

Preferably, dust filter includes dust filter box, sealed socket, sealed grafting frame, active carbon filter screen and pull handle, the air inlet of dust filter box left end passes through conveyer pipe and the inside intercommunication of intake pipe, the gas outlet of dust filter box right-hand member passes through the inside intercommunication of conveyer pipe and micro-nano bubble high energy oxidation tower, dust filter box upper end outer wall is inside to run through from left hand right side equidistance has a plurality of sealed sockets, and is a plurality of sealed grafting frame, a plurality of sealed grafting frame is inside all to be embedded to have active carbon filter screen, and is a plurality of the active carbon filter screen all sets up in dust filter box's inside, and is a plurality of all be provided with the pull handle on the outer wall of sealed grafting frame upper end center department.

Preferably, the micro-nano bubble high-energy oxidation tower, the low-temperature plasma waste gas treatment tower and the maintenance doors on the outer wall of the front end are fixedly connected through screws, and the maintenance doors, the micro-nano bubble high-energy oxidation tower and the low-temperature plasma waste gas treatment tower are sealed at the joint of the maintenance doors and the outer wall of the low-temperature plasma waste gas treatment tower.

Preferably, paint is sprayed on the metal outer walls of the dust filter, the micro-nano bubble high-energy oxidation tower, the low-temperature plasma waste gas treatment tower, the UV processor and the backwashing treatment box, and the dust filter, the micro-nano bubble high-energy oxidation tower, the low-temperature plasma waste gas treatment tower, the UV processor, the backwashing treatment box and the conveying pipe are fixedly connected through flanges.

Preferably, all be provided with sealed pad around the sealed grafting frame and on the lower extreme outer wall, around the sealed grafting frame and on the lower extreme outer wall sealed pad complete laminating respectively around the dust rose box and on the lower extreme inner wall, but the sealed grafting frame is through the inside extraction of follow dust rose box of pull handle is complete.

Preferably, water, a diluted ethanol solvent and a diluted ether solvent are respectively injected into the first washing chamber, the second washing chamber and the third washing chamber, the usage amount of the water, the diluted ethanol solvent and the diluted ether solvent is two thirds of the internal volume of the first washing chamber, the second washing chamber and the third washing chamber, and liquid changing pipe heads are arranged at the front ends of the lowest sides of the first washing chamber, the second washing chamber and the third washing chamber and on the outer wall of the front end of the backwashing treatment tank.

Compared with the prior art, the utility model provides novel waste gas purification and recovery equipment for nitrocotton production, which has the following beneficial effects:

1. according to the utility model, a new purification treatment step is added in the purification treatment process of the waste gas purification and recovery equipment for nitrocotton production, namely, the treated gas is subjected to secondary purification treatment through the novel back flush treatment device, and the purified gas can effectively purify harmful substances such as n-butyl alcohol, isopropanol and the like which are not completely treated in the waste gas after being purified again through the back flush treatment device, so that the condition that the purified gas contains trace amounts of harmful substances such as n-butyl alcohol, isopropanol and the like to harm the environment and human health can be avoided, the purification effect of the whole waste gas purification and recovery equipment for nitrocotton production can be increased, and the protection of the emission environment can be increased;

2. the specific use principle of the back washing processing device of the utility model is that after the waste gas is purified by the UV processor in the last process, the purified gas is in butt joint with the back washing processing device, so that the purified gas is conveyed to the interior of the bottom end of the flushing chamber through the L-shaped gas conveying pipe in the first flushing chamber, and two thirds of water is injected into the interior of the first flushing chamber, so that the gas conveyed to the interior of the first flushing chamber is fully mixed with the hydrosolvent, the hydrosolvent in the first flushing chamber can flush the passing gas, the unfiltered granular impurities and other harmful impurities in the gas are dissolved into the hydrosolvent, then the gas processed by the first flushing chamber is conveyed to the interior of the bottom end of the second flushing chamber through the L-shaped gas conveying pipe, and two thirds of diluted ethanol solvent is injected into the interior of the second flushing chamber, when the gas passes through the diluted ethanol solvent, the diluted ethanol solvent can dissolve n-butanol and isopropanol contained in the gas, particularly has excellent solubility on the n-butanol, so that the n-butanol in the gas can be quickly absorbed and dissolved, then the gas can be conveyed into the three bottom ends of the flushing chamber through the L-shaped gas conveying pipe, two thirds of diluted ether solvent with volume is injected into the three inner parts of the flushing chamber, the diluted ether solvent can quickly absorb the isopropanol contained in the gas after being fully contacted with the gas, finally the purified gas can be discharged through a recovery pipe head at the right top end of the back flushing treatment box, and the gas purified by the UV processor is subjected to triple purification by the back flushing treatment device, so that trace particle impurities, organic harmful substances, n-butanol and isopropanol lamp harmful substances contained in the gas can be fully purified, thereby make the gas that is discharged after the purification treatment cleaner health more, and can inject the relevant solvent of harmful substance in the absorbable waste gas in the washing room one, washing room two and the washing room three according to the difference of whole waste gas purification recovery plant for nitrocotton production purification recovery plant purification recovery waste gas composition, thereby can make whole waste gas purification recovery plant for nitrocotton production can be according to the difference of purifying waste gas can change this back flush processing apparatus in a flexible way and handle the kind of solvent to harmful substance, thereby can increase whole waste gas purification recovery plant for nitrocotton production's application range and use flexibility.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model without limiting the utility model in which:

FIG. 1 is a schematic view of the overall plane structure of a novel waste gas purification and recovery device for nitrocotton production, which is provided by the utility model;

FIG. 2 is a schematic view of the internal plan structure of a dust filter according to the present invention;

FIG. 3 is a schematic view of the internal plan structure of the backwash treatment apparatus according to the present invention;

in the figure: 1. an air inlet pipe; 2. a dust filter; 3. a micro-nano bubble high-energy oxidation tower; 4. a delivery pipe; 5. a low temperature plasma exhaust gas treatment tower; 6. a UV processor; 7. a backwashing treatment device; 8. recovering the pipe head; 9. repairing the door; 10. a dust filter box; 11. sealing the insertion opening; 12. sealing the plug-in frame; 13. an activated carbon filter screen; 14. a pull handle; 15. an L-shaped gas delivery pipe; 16. a first flushing chamber; 17. a backwashing treatment tank; 18. a second flushing chamber; 19. and a third flushing chamber.

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.

Example one

Referring to fig. 1 and fig. 2, the present invention provides a technical solution: a novel waste gas purification and recovery device for nitrocotton production comprises an air inlet pipe 1 and a dust filter 2, wherein the air inlet pipe 1 is installed at the left end of the dust filter 2, the right side of the dust filter 2 is provided with a micro-nano bubble high-energy oxidation tower 3, the right side of the micro-nano bubble high-energy oxidation tower 3 is provided with a low-temperature plasma waste gas treatment tower 5, the right side of the low-temperature plasma waste gas treatment tower 5 is provided with a UV processor 6, the right side of the UV processor 6 is provided with a back flush treatment device 7, the dust filter 2, the micro-nano bubble high-energy oxidation tower 3, the low-temperature plasma waste gas treatment tower 5, the UV processor 6 and the back flush treatment device 7 are communicated and connected with each other through a conveying pipe head 4, paints are sprayed on the metal outer walls of the dust filter 2, the micro-nano bubble high-energy oxidation tower 3, the low-temperature plasma waste gas treatment tower 5, the UV processor 6 and a back flush treatment box 17, the dust filter 2, the micro-nano bubble high-energy oxidation tower 3, the low-temperature plasma waste gas treatment tower 5, the UV processor 6, the back washing treatment box 17 and the conveying pipe 4 are fixedly connected through flanges, the conveying pipe 4 can be conveniently replaced or maintained through the butt joint and fixation of the flanges, so that the conveying pipes 4 with different materials and different lengths can be replaced according to the use requirements, maintenance doors 9 are respectively arranged on the outer walls of the front ends, close to the lower sides, of the micro-nano bubble high-energy oxidation tower 3 and the low-temperature plasma waste gas treatment tower 5, the micro-nano bubble high-energy oxidation tower 3, the low-temperature plasma waste gas treatment tower 5 and the maintenance doors 9 on the outer walls of the front ends are fixedly connected through screws, and sealing treatment is respectively adopted between the two maintenance doors 9 and the joint parts of the outer walls of the micro-nano bubble high-energy oxidation tower 3 and the low-temperature plasma waste gas treatment tower 5, a recovery tube head 8 is arranged on the outer wall of the upper end of the back washing processing device 7 close to the right side, the dust filter 2 comprises a dust filter box 10, a sealing socket 11, a sealing plug-in frame 12, an active carbon filter screen 13 and a pull handle 14, an air inlet at the left end of the dust filter box 10 is communicated with the inside of an air inlet pipe 1 through a conveying pipe 4, an air outlet at the right end of the dust filter box 10 is communicated with the inside of a micro-nano bubble high-energy oxidation tower 3 through the conveying pipe 4, a plurality of sealing sockets 11 penetrate through the inner part of the outer wall of the upper end of the dust filter box 10 from left to right at equal intervals, the sealing plug-in frames 12 penetrate downwards in the vertical inner parts of the plurality of sealing sockets 11, the active carbon filter screens 13 are embedded in the inner parts of the plurality of sealing plug-in frames 12, the plurality of active carbon filter screens 13 are all arranged in the inner part of the dust filter box 10, the pull handle 14 is arranged on the outer wall of the center of the upper ends of the plurality of the sealing plug-in frames 12, sealing plug-in front of the front and back of the sealing plug in the outer walls and on the lower ends of the sealing plug-in the sealing plug in frames 12, sealing gasket complete laminating respectively around dust rose box 10 and on the lower extreme inner wall around and on the sealed plug-in frame 12 and the lower extreme outer wall, sealed plug-in frame 12 can be complete take out from dust rose box 10 inside through pull handle 14, can make the waste gas of being carried in dust rose box 10 only can pass through activated carbon filter screen 13 through sealed processing that fills up, avoid waste gas to bypass activated carbon filter screen 13 and be carried next treatment facility in, can make activated carbon filter screen 13 fully purify filtering operation to waste gas like this, thereby can increase the purifying effect to waste gas.

Example two

Referring to fig. 1 and fig. 3, the present invention provides a technical solution: a novel waste gas purification and recovery device for nitrocotton production comprises a back flush treatment device 7, wherein the back flush treatment device comprises an L-shaped gas transmission pipe 15, a first flushing chamber 16, a back flush treatment box 17, a second flushing chamber 18 and a third flushing chamber 19, the first flushing chamber 16, the second flushing chamber 18 and the third flushing chamber 19 are sequentially arranged in the back flush treatment box 17 from left to right, the first flushing chamber 16, the second flushing chamber 18 and the third flushing chamber 19 are respectively provided with the L-shaped gas transmission pipe 15 on the inner wall close to the left end of the upper side, the lower ends of the three L-shaped gas transmission pipes 15 are respectively arranged on the upper side of the inner wall close to the lower end of the first flushing chamber 16, the second flushing chamber 18 and the third flushing chamber 19, the first flushing chamber 16 is communicated with a delivery pipe 4 through the L-shaped gas transmission pipe 15, the inside of the top end of the third flushing chamber 19 is communicated with the inside of a recovery pipe head 8, and the first flushing chamber 16, the second flushing chamber 18 and the third flushing chamber 19 are respectively filled with water, a diluting ethanol solvent and a diluting ether solvent, the using amount of water, the diluted ethanol solvent and the diluted ether solvent is two thirds of the internal volume of the first flushing chamber 16, the second flushing chamber 18 and the third flushing chamber 19, the liquid changing pipe heads are arranged at the front ends of the lowest sides of the first flushing chamber 16, the second flushing chamber 18 and the third flushing chamber 19 and on the outer wall of the front end of the backwashing treatment box 17, when the waste gas is subjected to the purification treatment of the final process through the UV treatment device 6, the purified gas is in butt joint with the backwashing treatment device 7, so that the purified gas is conveyed to the interior of the bottom end of the first flushing chamber 16 through the L-shaped gas conveying pipe 15 in the first flushing chamber 16, and because two thirds of the volume of water is injected into the first flushing chamber 16, the gas conveyed to the interior of the first flushing chamber 16 is fully mixed with the water solvent, so that the water solvent in the first flushing chamber 16 can flush the passing gas, and the unfiltered granular impurities and other harmful impurities in the gas are dissolved in the water solvent, then the gas treated by the first rinsing chamber 16 is transported to the inside of the bottom end of the second rinsing chamber 18 through the L-shaped gas transmission pipe 15, while the diluted ethanol solvent with two thirds volume is injected into the inside of the second rinsing chamber 18, when the gas passes through the diluted ethanol solvent, the diluted ethanol solvent can dissolve both n-butyl alcohol and isopropanol contained in the gas, especially has excellent solubility to n-butyl alcohol, so that the n-butyl alcohol in the gas can be rapidly absorbed and dissolved, then the gas is transported to the inside of the bottom end of the third rinsing chamber 19 through the L-shaped gas transmission pipe 15, while the diluted ether solvent with two thirds volume is injected into the inside of the third rinsing chamber 19, after the diluted ether solvent is fully contacted with the gas, the isopropanol contained in the gas can be rapidly absorbed, and finally the purified gas can be discharged through the recovery pipe head 8 at the right top end of the back washing treatment tank 17, and the gas purified by the UV processor 6 is subjected to triple purification by the back-washing processing device 7, so that trace particle impurities, organic harmful substances, n-butanol and harmful substances of an isopropanol lamp contained in the gas can be sufficiently purified, and the gas discharged after purification processing is cleaner and healthier.

The working principle and the using process of the utility model are as follows: after the device is installed, on the waste gas purifying and recycling device for nitrocotton production, firstly, a waste gas pipeline is butted with an air inlet pipe 1 at the left end of a dust filter 2, so that the waste gas pipeline can smoothly convey waste gas to be purified into the dust filter 2 through the air inlet pipe 1, then a plurality of sealing insertion frames 12 with activated carbon filter screens 13 inside are required to be inserted into a dust filter box 10, then the waste gas purifying and recycling device for nitrocotton production can be normally used for purifying the waste gas, after the waste gas is conveyed into the dust filter 2, granular impurities and most other harmful substances contained in the waste gas when the waste gas passes through the activated carbon filter screens 13 inside the dust filter box 10 can be blocked and filtered by the activated carbon filter screens 13, so that the waste gas is initially purified, and then the waste gas is conveyed into a micro-nano high-energy bubble oxidation tower 3 through a conveying pipe 4 to be further purified Then the gas is conveyed to a low-temperature plasma waste gas treatment tower 5 through a conveying pipe 4 to be subjected to plasma technology purification treatment, so that the waste gas is treated to reach the emission standard, then the purified gas is conveyed to a UV processor 6 to be subjected to UV ultraviolet sterilization treatment, finally the purified gas is conveyed to a back washing treatment device 7 to be subjected to final purification treatment, and the gas can completely meet the requirements of safe emission and recycling after being purified by the back washing treatment device 7.

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 utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a novel exhaust purification recovery plant is used in nitrocotton production, includes intake pipe (1) and dust filter (2), its characterized in that: the left end at dust filter (2) is installed in intake pipe (1), the right side of dust filter (2) is provided with micro-nano bubble high-energy oxidation tower (3), micro-nano bubble high-energy oxidation tower (3) right side is provided with low temperature plasma exhaust-gas treatment tower (5), low temperature plasma exhaust-gas treatment tower (5) right side is provided with UV treater (6), UV treater (6) right side is provided with back flush processing apparatus (7), dust filter (2), micro-nano bubble high-energy oxidation tower (3), low temperature plasma exhaust-gas treatment tower (5), UV treater (6) and back flush processing apparatus (7) all communicate through conveyer pipe (4) each other and connect, micro-nano bubble high-energy oxidation tower (3) and low temperature plasma exhaust-gas treatment tower (5) all are provided with maintenance door (9) on being close to downside front end outer wall, the backwashing treatment device (7) is provided with a recovery pipe head (8) on the outer wall close to the upper end of the right side, the backwashing treatment device (7) comprises an L-shaped gas transmission pipe (15), a first flushing chamber (16), a backwashing treatment box (17), a second flushing chamber (18) and a third flushing chamber (19), the first flushing chamber (16), the second flushing chamber (18) and the third flushing chamber (19) are sequentially arranged in the backwashing treatment box (17) from left to right, the first flushing chamber (16), the second flushing chamber (18) and the third flushing chamber (19) are close to the inner wall at the left end of the upper side and are all provided with the L-shaped gas transmission pipe (15), the lower ends of the three L-shaped gas transmission pipes (15) are respectively arranged at the first flushing chamber (16), the second flushing chamber (18) and the third flushing chamber (19) and are close to the upper side of the inner wall at the lower end of the flushing, the first flushing chamber (16) is communicated with the conveying pipe (4) through the L-shaped gas transmission pipe (15), the inside of the top end of the flushing chamber III (19) is communicated with the inside of the recovery pipe head (8).

2. The novel waste gas purification and recovery equipment for nitrocotton production according to claim 1, characterized in that: the dust filter (2) comprises a dust filter box (10), a sealing socket (11), a sealing socket frame (12), an active carbon filter screen (13) and a drawing handle (14), an air inlet at the left end of the dust filter box (10) is communicated with the inside of the air inlet pipe (1) through a conveying pipe (4), an air outlet at the right end of the dust filter box (10) is communicated with the inside of the micro-nano bubble high-energy oxidation tower (3) through a conveying pipe (4), dust rose box (10) upper end outer wall is inside to run through from left hand right side equidistance and has a plurality of sealed sockets (11), and is a plurality of sealed socket (11) vertical inside all runs through downwards has sealed plug frame (12), and is a plurality of sealed plug frame (12) is inside all to be embedded to have activated carbon filter screen (13), and is a plurality of activated carbon filter screen (13) all set up in the inside of dust rose box (10), and is a plurality of sealed plug frame (12) upper end center department all is provided with pull handle (14) on the outer wall.

3. The novel waste gas purification and recovery equipment for nitrocotton production according to claim 1, characterized in that: the micro-nano bubble high-energy oxidation tower (3), the low-temperature plasma waste gas treatment tower (5) and the maintenance door (9) on the outer wall of the front end are fixedly connected through screws, and sealing treatment is adopted between the maintenance door (9) and the joint of the outer walls of the micro-nano bubble high-energy oxidation tower (3) and the low-temperature plasma waste gas treatment tower (5).

4. The novel waste gas purification and recovery equipment for nitrocotton production according to claim 1, characterized in that: paint is sprayed on the outer metal walls of the dust filter (2), the micro-nano bubble high-energy oxidation tower (3), the low-temperature plasma waste gas treatment tower (5), the UV processor (6) and the backwashing treatment box (17), and the dust filter (2), the micro-nano bubble high-energy oxidation tower (3), the low-temperature plasma waste gas treatment tower (5), the UV processor (6) and the backwashing treatment box (17) are fixedly connected with the conveying pipe (4) through flanges.

5. The novel waste gas purification and recovery equipment for nitrocotton production according to claim 2, characterized in that: all be provided with sealed the pad around sealed plug-in frame (12) and on the lower extreme outer wall, sealed pad around sealed plug-in frame (12) and on the lower extreme outer wall is complete laminating around dust rose box (10) and on the lower extreme inner wall respectively, sealed plug-in frame (12) can be complete take out from dust rose box (10) inside through pull handle (14).

6. The novel waste gas purification and recovery equipment for nitrocotton production according to claim 1, characterized in that: the washing device is characterized in that water, a diluted ethanol solvent and a diluted ether solvent are respectively injected into the first washing chamber (16), the second washing chamber (18) and the third washing chamber (19), the using amounts of the water, the diluted ethanol solvent and the diluted ether solvent are two thirds of the internal volumes of the first washing chamber (16), the second washing chamber (18) and the third washing chamber (19), and liquid changing pipe heads are arranged at the front ends of the lowest sides of the first washing chamber (16), the second washing chamber (18) and the third washing chamber (19) and are positioned on the outer wall of the front end of the backwashing treatment box (17).