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CN-121971872-A - Distillation purification device for nitric acid processing

CN121971872ACN 121971872 ACN121971872 ACN 121971872ACN-121971872-A

Abstract

The invention relates to the technical field of nitric acid purification and separation, in particular to a distillation and purification device for nitric acid processing. Including the rectifying column, be equipped with the column plate in the rectifying column, install on the filtration pore of column plate and equally divide cover and spacer, the crane is all installed to the top and the below of column plate, equally divide cover upper and lower both ends and all be equipped with pivot, interior scraper blade and outer scraper blade, outer scraper blade fixed mounting is in the pivot, interior scraper blade passes through the setting that articulated rod can expand in the pivot, the crane puts up the equipartition on the crane has the breather pipe, the drive pivot is rotatory when the breather pipe is ventilated, the one end that the pivot tip inserted the breather pipe is equipped with the driving piece, be equipped with the fumarole with pivot cavity department intercommunication on the scraper blade. The invention can realize online full-dimension dead-angle-free scale removal of the rectifying tower, ensure continuous and stable production of electronic grade nitric acid, stably improve the purification precision of products, and synchronously realize the full-flow linkage of rotary shaft rotation driving, air injection scale removal, self-adaptive expansion of an inner scraping plate and spacer opening and closing by a single high-pressure inert gas source.

Inventors

  • GAO HONGTAO
  • NING BENDE
  • LI CAO
  • GAO YIFAN

Assignees

  • 安瑞森(宿迁)电子材料有限公司

Dates

Publication Date
20260505
Application Date
20260408

Claims (10)

  1. 1. The utility model provides a distillation purification device for nitric acid processing, a serial communication port, including rectifying column (1), be equipped with column plate (2) in rectifying column (1), divide the filtration pore top of column plate (2) and install the cover (3) that equally divide of dispersed gaseous phase, it is equipped with spacer (4) to go up and down in the filtration pore, crane (5) are all installed to the top and the below of column plate (2), both ends all are equipped with respectively about cover (3) equally divide each and divide into the scraping plate of rotating with crane (5) through pivot (6), the scraping plate divide into laminating and equally divide outer scraper blade (7) of cover (3) outer wall and can laminate and equally divide inner scraper blade (8) of cover (3) inner wall, outer scraper blade (7) fixed mounting is on pivot (6), inner scraper blade (8) are through articulated pole (9) can expand set up on pivot (6), compression pole (10) are installed at the top of pivot (6) that are located below column plate (2), the top of compression pole (10) can conflict spacer (4) and drive its laminating cover (3) inboard top, foot (4) are equipped with a plurality of ventilation pipe (12) through spacing frame (12) and are equipped with a plurality of ventilation pipe (12) and are gone into in the equal distribution on the upper and lower end of ventilation pipe (12), one end of the end part of the rotating shaft (6) is inserted into the vent pipe (12) is provided with a driving piece, the rotating shaft (6) is arranged in a hollow mode, the scraping plate is provided with a gas nozzle (13) communicated with the hollow part of the rotating shaft (6), and the gas outlet end of the vent pipe (12) penetrates through the driving piece and then is communicated with the gas nozzle (13).
  2. 2. The distillation purification device for nitric acid processing according to claim 1, wherein the breather pipe (12) is provided with a driving cavity (15), the driving piece is a rotating paddle (16), the rotating paddle (16) is arranged in the driving cavity (15), and the rotating paddle (16) is fixedly connected with the rotating shaft (6).
  3. 3. The distillation purification device for nitric acid processing according to claim 1, wherein the top of the compression rod (10) is fixedly provided with a squeeze plate (17) which is abutted against the spacer (4), the squeeze plate (17) is fixedly connected with the compression rod (10), the upper end and the lower end of the cloth equalizing cover are respectively provided with a rotating disc (18), and the outer scraping plate (7) is fixedly arranged on the rotating shaft (6) through a mounting plate (19).
  4. 4. The distillation and purification device for nitric acid processing according to claim 3, wherein a spring (20) is sleeved on the compression rod (10), one end of the hinge rod (9) is hinged with the extrusion plate (17), the other end of the hinge rod (9) is hinged with the inner side wall of the inner scraping plate (8), a telescopic guide rod (21) is horizontally arranged on the inner side wall of the inner scraping plate (8), and the other end of the telescopic guide rod (21) is fixedly connected with the rotating shaft (6).
  5. 5. The distillation and purification device for nitric acid processing according to claim 4, wherein the telescopic guide rod (21) is arranged in a hollow manner and is communicated with the hollow rotating shaft (6), and the air jet opening (13) on the inner scraper (8) is communicated with the air guide part in the telescopic guide rod (21).
  6. 6. The distillation and purification device for nitric acid processing according to claim 1, wherein the mounting plate (19) is provided with an air duct (22), and both ends of the air duct (22) are respectively communicated with the air jet (13) on the outer scraper (7) and the hollow part of the rotating shaft (6).
  7. 7. The distillation purification device for nitric acid processing according to claim 1, wherein the distillation purification device is characterized in that driving devices are arranged in the rectifying tower (1), the driving devices are provided with two groups and are respectively arranged on two sides of the tower plate (2), one group of driving devices is used for driving a plurality of lifting frames (5) above the tower plate (2) to synchronously displace, the other group of driving devices is used for driving a plurality of lifting frames (5) below the tower plate (2) to synchronously displace, the driving devices comprise a driving threaded rod (23), a limiting rod (24) and a threaded sleeve (25), the driving threaded rod (23) is vertically arranged in the rectifying tower (1), the threaded sleeve (25) is provided with a plurality of threaded sleeves (25), each lifting frame (5) is fixedly provided with one threaded sleeve (25) in threaded connection with the corresponding driving threaded rod (23), the limiting rod (24) is provided with a plurality of limiting rods (24) in a sliding fit mode, and a plurality of limiting rods (24) are vertically arranged between each two tower plates (2).
  8. 8. The distillation purification device for nitric acid processing according to claim 1, wherein the outer scraping plate (7) and the inner scraping plate (8) are respectively provided with an inclined chamfer (26), the air nozzle (13) is arranged on the inclined chamfer (26), the outer side of the air nozzle (13) is provided with a hinged frame (27), one end of the hinged frame (27) is hinged on the scraping plate, and a shielding plate (28) capable of shielding the air nozzle (13) is fixedly arranged on the hinged frame (27).
  9. 9. The distillation and purification device for nitric acid processing according to claim 8, wherein a torsion spring (29) is installed on the hinge shaft, and both ends of the torsion spring (29) are fixedly connected with the hinge frame (27) and the scraping plate respectively.
  10. 10. A distillation purification apparatus for nitric acid processing according to claim 9, wherein a sealing gasket is provided at an end of the shielding plate (28) near the gas nozzle (13).

Description

Distillation purification device for nitric acid processing Technical Field The invention relates to the technical field of nitric acid purification and separation, in particular to a distillation and purification device for nitric acid processing. Background In the continuous rectification production process of electronic grade nitric acid, trace impurities and metal ions which are condensed and separated out by nitric acid vapor can be continuously deposited on the surfaces of tray filtering holes and gas phase uniform distributing covers in a rectification tower, and scaling blockage is easy to form after long-term operation. The scaling can directly cause the reduction of the flow area of the filter holes, uneven ascending gas phase distribution and great reduction of the gas-liquid mass transfer efficiency of the tower plates, and finally, the rectification purification precision is insufficient, so that the purity requirement of the electronic grade nitric acid cannot be met. The main stream cleaning mode is manual cleaning of shutdown tower disassembly, continuous production flow is required to be interrupted, cleaning period is long, efficiency is low, and large-scale continuous production capacity of electronic grade nitric acid is severely restricted. A self-maintenance type separation nitric acid tower shown in Chinese patent publication No. CN115845593A comprises a main tower body, an external infusion tube for conveying saturated ammonium sulfate solution, an adjusting motor and a driving motor. The self-maintenance type separation nitric acid tower provided by the invention adopts an automatic maintenance mode to clean and deslagge the surface of the annular filter screen frame, so that the maintenance period is greatly prolonged, the later use cost is reduced, the whole annular filter screen frame is driven by a driving motor to rotate, so that crystals on the surface are automatically scraped, the cleanliness of the surface of the annular filter screen frame is kept, the gas transmission reaction efficiency is improved, the whole device can be quickly controlled to disassemble and separate through an adjusting motor, the later disassembly and separation difficulty is reduced, and the operation is simpler and more convenient. In order to improve the uniformity of gas phase and liquid phase contact and improve the purification and separation precision, a fixed equipartition cover is usually arranged above a filtering hole of a tower plate, in the equipment, the tower plate in the form cannot be cleaned, the inside and outside cleaning capability of the equipartition cover cannot be deeply and uniformly arranged, the inner wall scale cleaning cannot be finished in the cover, serious cleaning dead angles exist, the problem of scale blockage cannot be thoroughly solved, pneumatic auxiliary cleaning is lacking, scraped scale cannot be quickly removed from the scale during cleaning, nitric acid steam is very easy to flow back into a gas path under the working conditions of high temperature, strong corrosion and high vapor pressure in a rectifying tower, pipeline corrosion and blockage of a gas nozzle are caused, the equipment operation stability is poor, and the service life is short. Disclosure of Invention Accordingly, it is necessary to provide a distillation and purification apparatus for nitric acid processing in order to solve the problems of the prior art. In order to solve the problems in the prior art, the invention adopts the following technical scheme: The invention provides a distillation purification device for nitric acid processing, which comprises a rectifying tower, wherein a tower plate is arranged in the rectifying tower, a dispersed gas phase equipartition cover is arranged above a filtering hole of the tower plate, a spacer is arranged in the filtering hole in a lifting manner, a lifting frame is arranged above and below the tower plate, scraping plates which are rotationally connected with the lifting frame through rotating shafts are respectively arranged at the upper end and the lower end of each equipartition cover, the scraping plates are divided into an outer scraping plate which is attached to the outer wall of the equipartition cover and an inner scraping plate which is attached to the inner wall of the equipartition cover, the outer scraping plates are fixedly arranged on the rotating shafts, the inner scraping plates are arranged on the rotating shafts in an expanding manner through hinging rods, the top of the rotating shafts below the tower plate is provided with a compression rod, the top of the compression rod can abut against the spacer and drive the top of the equipartition cover, the spacer is arranged on the filtering hole in a sliding manner through limiting pins, a vent pipe is uniformly distributed on the lifting frame, high-pressure gas is introduced into the vent pipe, the vent end of the vent pipe is provided with a plurality of rotating shafts and corre