CN203017956U

CN203017956U - Vapor scrubbing tower used in dilute acid concentrating device

Info

Publication number: CN203017956U
Application number: CN 201220741413
Authority: CN
Inventors: 李德昌; 韩朝魁
Original assignee: Anhui Bayi Chemical Industry Co Ltd
Current assignee: Anhui Bayi Chemical Industry Co Ltd
Priority date: 2012-12-29
Filing date: 2012-12-29
Publication date: 2013-06-26
Anticipated expiration: 2022-12-29

Abstract

The utility model relates to a vapor scrubbing tower used in a dilute acid concentrating device. The vapor scrubbing tower used in the dilute acid concentrating device comprises an upper seal head, a middle cylinder body and a lower seal head, wherein a vapor phase outlet and a liquid inlet pipe opening are arranged on the upper seal head; an upper hand hole and a lower hand hole are formed in the middle cylinder body, and a filler is arranged inside the middle cylinder body; a liquid discharge pipe opening, a vapor phase inlet and a liquid outlet pipe opening are arranged on the lower seal head; a supporting pore plate is arranged between the middle cylinder body and a connection flange of the upper seal head; a supporting annular board is arranged between the middle cylinder body and a connection flange of the lower seal head; the supporting annular board is fixed between the two flanges; supporting gratings are arranged on the supporting annular board; the supporting pore plate is arranged on the supporting gratings; the upper seal head and the supporting annular board use carbon steel as a base material, and are lined with a polytetrafluoroethylene material; the middle cylinder body and the lower seal head use the carbon steel, and are lined with a tantalum material; the supporting gratings are made up of steel pipes covered by the polytetrafluoroethylene material; and the supporting pore plate, fixing strips and fixing blocks are made of the polytetrafluoroethylene material. The vapor scrubbing tower used in the dilute acid concentrating device provided by the utility model has the advantages that the expensive polytetrafluoroethylene material is saved, the equipment is reasonable in structure and is convenient to mount, and the vapor scrubbing tower used in the dilute acid concentrating device creates the conditions for the large scale of the equipment.

Description

That uses in a kind of diluted acid enrichment facility washes the vapour tower

Technical field

The utility model relates to chemical industry concentrated field, particularly relates to a kind ofly washing the vapour device for the diluted acid evaporation and concentration.

Background technology

Nitro-chlorobenzene is important organic chemical industry's intermediate, purposes is very extensive, this product mainly adopts Benzene Chloride and nitration mixture continuous nitrification explained hereafter, after nitration reaction finishes, have a large amount of diluted acids and produce, its main component is 72% sulfuric acid, water and a small amount of nitric acid and nitre oil, according to the technique needs, sometimes also contain certain density phosphoric acid in diluted acid, consume and environmental requirement in order to reduce sulfuric acid (phosphoric acid), this spent acid need to be concentrated to 90% left and right again and recycle.Present state-of-the-art concentration technology is that diluted acid adopts Steam Heating vacuum evaporation in steaming sour device, and steam rising can be taken away a large amount of sulfuric acid (phosphoric acid) and a small amount of nitre wet goods in evaporation process, needs to adopt to wash the vapour tower with sulfuric acid and the recovery of nitre oil wash.Because the acid vapor temperature is very high, has very strong corrosivity, and along with production-scale continuous expansion, the physical dimension of equipment is also increasing, how to prevent equipment corrosion, guarantee under the equipment high vacuum air-tightness, guarantee that the gas scrubbing effect becomes and wash vapour tower problem needing to overcome in the structural design and processing process.

Typically wash at present vapour tower material multiselect Q345R liner enamel in the dense device of spent acid.Structure is divided three sections designs, is respectively upper cover, stage casing cylindrical shell, low head; The built-in distributor of upper cover, the in-built filler of stage casing cylindrical shell, low head arranges steam inlet; The packing support orifice plate adopts polyfluortetraethylene plate, have passage on plate, tetrafluoro supports orifice plate and is fixed between low head and cylindrical shell lower flange face, places the thickening Tetrafluoro spacer between tetrafluoro orifice plate and flange face, and tower body is connected fastening with the employing enamel equipment clamp of end socket.

This is washed the vapour tower and has following defective: when 1, washing the vapour tower and normally using, the upper end temperature is low, the lower end temperature is high, excursion is 50-170 ℃, in the process of device start-stop car, variations in temperature can be larger, and because the enamel glaze is different with the base material coefficient of expansion, equipment ceramic glaze surface often occurs and breaks and come off, and cause the base material perforation, cause whole equipment scrapping; 2, pressing plate and support orifice plate adopt pure tetrafluoroethene plate, because PTFE has creep properties, more the high-ductility distortion is more obvious for temperature, and the tetrafluoro orifice plate in use for some time, middle part meeting significant depressions, cause monoblock tetrafluoro orifice plate to shrink to the middle part, finally cause flange face can't clamp tetrafluoro support orifice plate and cause system leak, particularly the equipment temperature of lower is high, support the more yielding damage of orifice plate, device diameters is larger, and deformation velocity is faster, has limited the further maximization of equipment.

The utility model content

The technical problems to be solved in the utility model be to provide a kind of can reinforcer supporting construction intensity, reduce the supported hole plate thickness, and high-low temperature resistant changes, anti-sulfuric acid and phosphoric acid corrosion wash the vapour tower.

For solving the problems of the technologies described above, the technical solution of the utility model is: that uses in a kind of diluted acid enrichment facility washes the vapour tower, and it is divided into three sections, upper cover, middle cylindrical shell, low head; The upper cover top arranges gaseous phase outlet, and the side is provided with the feed liquor mouth of pipe; Middle cylindrical shell is provided with hand hole, lower hand hole, and inside is equipped with filler; The tapping mouth of pipe is arranged at the low head bottom, and sidewall is established gas phase import, the fluid mouth of pipe; Middle cylindrical shell adopts flange to be connected with upper cover, is provided with the support orifice plate between two flanges, and supporting orifice plate is pure PTFE; It is characterized in that, middle cylindrical shell adopts flange to be connected with low head, is provided with the support ring flat-plate between two flanges, supports ring flat-plate and is fixed in the middle of two flanges, is placed with supportive grid on the support ring flat-plate, and on supportive grid, horizontal has the support orifice plate, supports orifice plate and is provided with filler; Each supporting steel pipe in described supportive grid passes that hole is linked together in the middle of fixed strip, and each supporting steel pipe two ends arrange fixed block and are placed in and support on ring flat-plate.

The beneficial effects of the utility model are:

Wash the support of vapour tower lower flange connection place filler and adopt fabricated structure, consider from support strength, supporting in ring flat-plate and supportive grid all has steel to do skeleton, compare with pure PTFE, supporting the thickness of ring flat-plate and the caliber of supportive grid accomplishes very little, enough strength support inner-tower filling materials namely can be provided, and can not vary with temperature with passage of time and deform; Consider the rigidity grid is arranged as support due to following from the material materials, tetrafluoro supported hole plate thickness can significantly reduce, and the consumption of expensive PTFE reduces approximately 50%, has reduced equipment cost; Consider from installation and the serviceability of equipment, the fabricated structure material usage is few, and the substep assembling is convenient to install, and is difficult for distortion owing to supporting ring flat-plate, can guarantee the sealing of flange face, has extended the time between overhauls(TBO) of equipment.

As improvement of the present utility model, described upper cover is selected composite, and base material is carbon steel, the liner PTFE; Stage casing cylindrical shell and low head are selected composite, and base material is carbon steel, liner tantalum material; Supporting ring flat-plate adopts the carbon steel ring flat-plate to coat the PTFE structure; Supportive grid adopts steel pipe to coat PTFE, and fixed strip and fixed block are PTFE.

Its advantage is:

Wash and be pure gas-phase space in the upper cover of vapour tower, adopt the steel lining tetrafluoro material, middle part packing section and low head adopt the steel lining tantalum material, compare with traditional enamel material to have that decay resistance is strong, heatproof degree acute variation, be easy to make the maximization equipment characteristic; PTFE and tantalum material have fabulous anti-sulfuric acid and phosphoric acid corrosion, at no corrosion below 200 ℃, thus can do very thin lining, and the corrosion of enamel material non-refractory phosphoric acid; PTFE has creep properties, the tantalum material has good ductility, so equipment is temperature generation acute variation when the start-stop car, lining can not rupture or separate with base material, and enamel material is different from the carbon steel base material coefficient of expansion due to enamel, and the easy ductility of enamel is very poor, and under thermal shock, enamel is easy to break, come off; Because enamel equipment must carry out high temperature sintering, in this process, often can cause the distortion of large-sized flange face, cause equipment sealing difficulty; As from the foregoing, enamel is washed the vapour tower body and is difficult to do greatly, washes the vapour tower after lining tantalum material and lining PTFE and can accomplish to maximize.

In sum, adopt scheme of the present utility model, improved the intensity of washing vapour tower packing supporting construction, reduced the supported hole plate thickness, and high-low temperature resistant changes, anti-sulfuric acid and phosphoric acid corrosion.Realized the saving of expensive PTFE, device structure is reasonable, installation is convenient, for condition has been created in the maximization of equipment.

Description of drawings

Fig. 1 is structural representation of the present utility model;

Fig. 2 is that in Fig. 1, upper flange connects the partial structurtes schematic diagram;

Fig. 3 is supported hole plate structure schematic diagram in Fig. 2;

Fig. 4 is lower flange draw bail schematic diagram in Fig. 1;

Fig. 5 is support ring plate structure schematic diagram in Fig. 4;

Fig. 6 is the B-B cutaway view of Fig. 5;

Fig. 7 is support grid structure schematic diagram in Fig. 4.

The specific embodiment

By reference to the accompanying drawings the utility model is described in further detail below by specific embodiment:

Referring to Fig. 1, originally wash the vapour tower and comprise upper cover 1, middle cylindrical shell 2, low head 3, adopt flange connect between upper cover 1, low head 3 and middle cylindrical shell 2.

As shown in Figure 1, described upper cover 1 top is ellipse head, crown center arranges gaseous phase outlet 101, the both sides, top arrange respectively instrumentation tap 102, the both sides, middle part are provided with the feed liquor mouth of pipe 103, upper cover 1 and each mouth of pipe are double-decker, and skin is carbon steel material (as Q345R), inner-wall spraying (or roller coating) polytetrafluoroethylene (PTFE) (or Meltability polytetrafluorethyletubular) coating.

As shown in Figure 1, described middle cylindrical shell 2 is provided with hand hole 201, lower hand hole 204, and inside is placed with filler 203, and outer wall is provided with mounting flange 202.

As Fig. 1, Fig. 2, shown in Figure 3, middle cylindrical shell 2 adopts flange to be connected with upper cover 1, is provided with between two flanges and supports orifice plate 4; The plate face of described support orifice plate 4 offers passage, supports orifice plate 4 and adopts the polytetrafluoroethylene (PTFE) material.

As shown in Figure 1, described low head 3 bottoms are ellipse head, and the tapping mouth of pipe 303 is arranged at the bottom, and sidewall is established gas phase import 301, the fluid mouth of pipe 302.

In the middle of described, cylindrical shell 2, low head 3 and each mouth of pipe adopt the two-layer compound plate structure, and the internal layer of composite plate is tantalum material (as Ta1), and skin is carbon steel material (as Q345R).

As Fig. 1, shown in Figure 5, middle cylindrical shell 2 adopts flange to be connected with low head 3, is provided with between two flanges and supports ring flat-plate 5, supports ring flat-plate 5 and is fixed in the middle of two flanges, and supportive grid 6 is placed on and supports on ring flat-plate 5, supports orifice plate 4 and is flat on supportive grid 6; As Fig. 6, shown in Figure 7, described support ring flat-plate 5 adopts the tetrafluoro clad structure, and internal layer is carbon steel material (as Q245R), and coating is polytetrafluoroethylmaterial material; As shown in Figure 7, in the middle of each supporting steel pipe 602 in described supportive grid 6 passes fixed strip 601, hole is linked together, each supporting steel pipe 602 two ends arrange fixed block 603 and are placed in and support on ring flat-plate 5, supporting steel pipe 602 adopts composite construction, inside is carbon steel material (as Q245R), the outer polytetrafluoroethylene (PTFE) that coats, fixed strip 601 and fixed block 603 are the polytetrafluoroethylene (PTFE) material.

Above-described is only a kind of embodiment of the present utility model.Should be pointed out that for the person of ordinary skill of the art, under the prerequisite that does not break away from the utility model principle, can also make apparent some conversion or substitute and remodeling, these also should be considered as belonging to protection domain of the present utility model.

Claims

1. that uses in a diluted acid enrichment facility washes the vapour tower, and it comprises upper cover, middle cylindrical shell, low head; The upper cover top arranges gaseous phase outlet, and the side is provided with the feed liquor mouth of pipe; Middle cylindrical shell is provided with hand hole, lower hand hole, and inside is equipped with filler; The tapping mouth of pipe is arranged at the low head bottom, and sidewall is established gas phase import, the fluid mouth of pipe; Middle cylindrical shell adopts flange to be connected with upper cover, is provided with the support orifice plate between two flanges, and supporting orifice plate is pure PTFE; It is characterized in that, middle cylindrical shell adopts flange to be connected with low head, is provided with the support ring flat-plate between two flanges, supports ring flat-plate and is fixed in the middle of two flanges, is placed with supportive grid on the support ring flat-plate; Horizontal has the support orifice plate on supportive grid, supports on orifice plate and is placed with filler; Each supporting steel pipe in described supportive grid passes that hole is linked together in the middle of fixed strip, and each supporting steel pipe two ends are provided with fixed block and are placed in and support on ring flat-plate.

2. that uses in a kind of diluted acid enrichment facility according to claim 1 washes the vapour tower, and it is characterized in that: upper cover is selected composite, and base material is carbon steel, the liner PTFE; Middle cylindrical shell and low head are selected composite, and base material is carbon steel, liner tantalum material; Supporting ring flat-plate adopts the carbon steel ring flat-plate to coat the PTFE structure; Supportive grid adopts steel pipe to coat PTFE, and fixed strip and fixed block are PTFE.