CN110937646A

CN110937646A - Denitrogenation column plate for ammonia still

Info

Publication number: CN110937646A
Application number: CN201911018069.6A
Authority: CN
Inventors: 姚春阳; 古创; 彭磊; 苏雅; 郑晓宇; 朱亚茹
Original assignee: Everbright Envirotech China Ltd; Everbright Environmental Protection Research Institute Nanjing Co Ltd
Current assignee: Everbright Envirotech China Ltd; Everbright Environmental Protection Research Institute Nanjing Co Ltd
Priority date: 2019-10-24
Filing date: 2019-10-24
Publication date: 2020-03-31

Abstract

The invention provides a denitrification tower plate for an ammonia still, which is formed by combining a plurality of angle steel units, wherein each angle steel unit comprises two intersecting planes and a common edge; wherein the two intersecting planes form a tray slope, and the common rib is positioned above the tray slope to form a water distribution strip; wherein, the upper surface of the inclined plane of the tower plate is provided with a plurality of bulges so as to form a water retaining strip. According to the denitrification tower plate for the ammonia distillation tower, the water retaining strips are formed by arranging the bulges on the inclined plane of the tower plate formed by the angle steel units, so that water flow is dispersed, the water flow area is enlarged, the water flow direction is controlled, the water flow speed is delayed, the contact area and the contact time of steam and waste water are improved, the tower plate efficiency is improved, and the ammonia distillation energy consumption is reduced.

Description

Denitrogenation column plate for ammonia still

Technical Field

The invention relates to the field of wastewater treatment, in particular to a denitrification tower plate for an ammonia still.

Background

In recent years, the economic society of China is rapidly developed, the living standard of people is gradually improved, and the quantity of garbage generated by everyone is more and more. At present, domestic garbage treatment and disposal modes in China are mainly landfill and incineration treatment, but a great deal of garbage leachate is generated in the process of landfill and incineration treatment. In addition, other industrial departments also have a lot of wastewater with high hardness, easy scaling and containing ammonia and nitrogen which needs to be treated urgently. Besides the traditional A/O biochemical treatment, the wastewater can be treated by adopting an ammonia still for denitrification. The water quality has the characteristics of high solid content, high hardness and easy scaling, and when the tower plate is selected, a wide flow passage and an anti-scaling tower plate are selected.

Therefore, it is necessary to provide a new denitrification tray for an ammonia still to solve the above problems.

Disclosure of Invention

In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

The invention provides a denitrification tower plate for an ammonia still, which is formed by combining a plurality of angle steel units, wherein each angle steel unit comprises two intersecting planes and a common edge;

wherein the two intersecting planes form a tray slope, and the common rib is positioned above the tray slope to form a water distribution strip;

wherein, the upper surface of the inclined plane of the tower plate is provided with a plurality of bulges so as to form a water retaining strip.

Further, the water bars comprise a first-level water bar, a second-level water bar and a third-level water bar which are arranged from top to bottom.

Furthermore, the inclined plane of the tower plate comprises a plurality of transversely arranged first-stage water retaining strips, and a gap is formed between every two adjacent first-stage water retaining strips; the tower plate inclined plane comprises a plurality of transversely arranged secondary water retaining strips, and a gap is formed between every two adjacent secondary water retaining strips; the tower plate inclined plane comprises a plurality of transversely arranged three-stage water retaining strips, and a gap exists between every two adjacent three-stage water retaining strips.

Further, the first-stage water bar comprises an arc-shaped water bar, the arc-shaped water bar is in a shape of a downward convex arc, and the range of the circle center angle corresponding to the arc-shaped water bar is 100-160 degrees.

Further, the secondary water bar comprises a herringbone water bar, and the angle range of the herringbone water bar is 110-140 degrees.

Further, the three-level water retaining strip comprises a reversed V-shaped water retaining strip, and the angle range of the reversed V-shaped water retaining strip is 120-160 degrees.

Further, the distance range between the lowest point of the first-stage water retaining strip and the upper edge of the inclined plane of the tower plate is 8mm to 10mm, and the distance range between the lowest point of the third-stage water retaining strip and the lower edge of the inclined plane of the tower plate is 4mm to 6 mm.

Further, the shape of the water distribution strip comprises a cylinder, and the diameter of the water distribution strip ranges from 5mm to 8 mm.

Further, the included angle between the two intersecting planes ranges from 30 degrees to 150 degrees.

Further, a tower plate gap exists between the adjacent angle steel units.

According to the denitrification tower plate for the ammonia distillation tower, the water retaining strips are formed by arranging the bulges on the inclined plane of the tower plate formed by the angle steel units, so that water flow is dispersed, the water flow area is enlarged, the water flow direction is controlled, the water flow speed is delayed, the contact area and the contact time of steam and waste water are improved, the tower plate efficiency is improved, and the ammonia distillation energy consumption is reduced.

Drawings

The following drawings of the invention are included to provide a further understanding of the invention. There are shown in the drawings, embodiments and descriptions thereof, which are used to explain the principles and apparatus of the invention. In the drawings, there is shown in the drawings,

FIG. 1 shows a top view of a denitrification tray for an ammonia still according to an exemplary embodiment of the invention;

FIG. 2 shows a cross-sectional view of a denitrification tray for an ammonia still according to an exemplary embodiment of the invention;

FIG. 3 shows a schematic diagram of a water bar for a denitrification tray of an ammonia still according to an exemplary embodiment of the present invention.

Reference numerals

100. Angle steel unit 200 and tower plate gap

101. Tower plate inclined plane 102, water distribution bar

111. A first-level water bar 112 and a second-level water bar

113. Three-level water bar

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.

It is to be understood that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. Like reference numerals refer to like elements throughout.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.

In order to provide a thorough understanding of the present invention, detailed steps and detailed structures will be set forth in the following description in order to explain the present invention. The following detailed description of the preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.

When the ammonia still denitrification technology is used for treating wastewater with high solid content, high hardness and easy scaling, a tower plate with a wide flow passage and scaling resistance is selected. The angle steel type tower plate is an important tower plate form and has the characteristics of reduced tower plate pressure, blockage resistance, simple manufacture, low investment cost and the like, but the tower plate of the type has high energy consumption and low treatment efficiency in the use process.

In order to solve the problems, the invention provides a denitrification tower plate for an ammonia still, which is formed by combining a plurality of angle steel units 100, wherein each angle steel unit 100 comprises two intersecting planes and a common edge, as shown in figures 1-3;

wherein the two intersecting planes form a tray slope 101 and the common rib is located above the tray slope 101 to form a water distribution strip 102;

wherein, the upper surface of the tray inclined plane 101 is provided with a plurality of bulges so as to form a water retaining strip.

The ammonia still is an operation device which makes ammonia dissolved in circulating water volatilize and release by heat transfer of a heat carrier. The working principle is as follows: the method adopts general heat carrier steam as a heating agent, so that the equilibrium steam pressure of ammonia on the liquid level of circulating water is greater than the partial pressure of ammonia in a heat carrier, and the vapor-liquid two phases are in countercurrent contact to carry out mass transfer and heat transfer, so that the ammonia is gradually released from the circulating water, a mixture of the ammonia steam and the steam is obtained at the tower top, and purer circulating water is obtained at the tower bottom.

Further, the denitrification tower plate is one of important parts in the ammonia still, and is usually made of high-temperature-resistant and corrosion-resistant materials. As an example, the denitrification tower plate is made of angle steel. The angle steel belongs to carbon structural steel for construction, is a section steel with a simple section, and has better weldability, plastic deformation performance and certain mechanical strength.

Illustratively, the denitrification tray is formed by combining a plurality of angle steel units 100, wherein each angle steel unit 100 comprises two intersecting planes and a common edge; wherein the two intersecting planes form a tray slope 101 and the common rib is located above the tray slope 101 to form a water distribution strip 102, as shown in fig. 2.

Illustratively, the length of each angle unit 100 is the same or different. In one example, the denitrification tray is comprised of a plurality of angle units 100 of varying lengths.

During the operation of the ammonia still, the wastewater flows from top to bottom, firstly falls on the water distribution strip 102 at the highest position of the denitrification tower plate, and is subjected to primary dispersion after flowing through the water distribution strip 102, so that the wastewater further flows to the inclined planes 101 of the tower plates at the two sides of the water distribution strip 102.

Illustratively, the water distribution strips 102 protrude from the inclined plane 101 of the tray, and the height of the protrusions of the water distribution strips 102 ranges from 3mm to 5 mm.

Further, the shape of the water distribution strip 102 includes, but is not limited to, a cylinder with a diameter ranging from 5mm to 8 mm.

The wastewater primarily dispersed by the water distribution strips 102 flows from top to bottom along the inclined tower plate surface 101, and gradually flows from the upper edge of the inclined tower plate surface 101 to the lower edge of the inclined tower plate surface 101.

Illustratively, the deck ramp 101 is formed by two intersecting planes of angle steel, the angle between which is in the range of 30 to 150 degrees. The flow speed of the waste water can be controlled by selecting the angle steels with different included angles, when the included angle degree is small, the waste water flows down along the inclined plane 101 of the tower plate quickly, and when the included angle degree is large, the waste water flows down along the inclined plane 101 of the tower plate slowly.

Illustratively, a tray gap 200 exists between adjacent ones of the angle steel units 100.

In the operation process of the ammonia still, the wastewater flows from top to bottom in the tower plate gap 200, and the steam flows from bottom to top in the tower plate gap 200, so that the effects of separating and extracting ammonia nitrogen in the wastewater are realized.

Illustratively, the upper surface of the tray deck slope has a plurality of protrusions to form water bars. Referring to fig. 3, the water bars include a first-stage water bar 111, a second-stage water bar 112, and a third-stage water bar 113 arranged from top to bottom.

Illustratively, the raised height of the water bar ranges from 2mm to 5 mm.

In the process that the wastewater gradually flows from the upper edge of the tray inclined plane 101 to the lower edge of the tray inclined plane 101, the wastewater sequentially flows through the first-stage water retaining strip 111, the second-stage water retaining strip 112 and the third-stage water retaining strip 113, so that the water flow is dispersed again, and meanwhile, the water flow area can be enlarged, the water flow direction can be controlled, and the water flow speed can be delayed, so that the contact area and the contact time of steam and the wastewater are improved, the denitrification efficiency is improved, and the denitrification energy consumption is reduced.

As shown in FIG. 3, the tray inclined plane 101 comprises a plurality of first-stage water bars 111 arranged transversely, and a gap exists between adjacent first-stage water bars 111; the tower plate inclined plane 101 comprises a plurality of transversely arranged secondary water retaining strips 112, and gaps exist between the adjacent secondary water retaining strips; the inclined plane 101 of the tower plate comprises a plurality of three-stage water retaining strips 113 which are transversely arranged, and gaps exist between the adjacent three-stage water retaining strips 113.

Preferably, the first-stage water bar 111, the second-stage water bar 112 and the third-stage water bar 113 are arranged in a staggered manner. That is, the second-stage water bars 112 are located below the gaps of the adjacent first-stage water bars 111, and the third-stage water bars 113 are located below the gaps of the adjacent second-stage water bars 112.

Illustratively, the primary water bar 111 includes any shape of protrusion that can achieve water flow dispersion, water flow area enlargement, and water flow speed retardation, including but not limited to a horizontal line, a herringbone, an upwardly convex arc, a downwardly convex arc, a V, a rectangle, a circle, and the like. Preferably, the primary water bar 111 comprises an arc-shaped water bar, and the arc-shaped water bar is in a shape of a downward convex arc (i.e., two ends of the arc are higher than the middle of the arc).

Further, the circle center angle range corresponding to the arc-shaped water bar is 100-160 degrees.

Further, the distance between the lowest point of the primary water retaining strip 111 and the upper edge of the inclined plane of the tower plate ranges from 8mm to 10 mm.

In the process that the wastewater flows from the inclined plane 101 of the tower plate to the bottom, a part of the wastewater overflows the primary water barrier 111, and a part of the wastewater flows from the middle to the two sides along the primary water barrier 111, then overflows from the two sides of the arc shape and flows down through the gaps between the primary water barriers 111. By adopting the arc-shaped water retaining strips which are convex downwards as the first-stage water retaining strips, water flow can be dispersed as much as possible, the water flow area is enlarged, the water flow speed is delayed, the contact area and the contact time of steam and waste water are improved, the denitrification efficiency is improved, and the denitrification energy consumption is reduced.

Illustratively, the secondary water bar 112 includes any shape of protrusion that can achieve water flow dispersion and water flow area enlargement, including, but not limited to, a horizontal line, a herringbone, an upwardly convex arc, a downwardly convex arc, a "V" shape, a rectangular shape, a circular shape, and the like. Preferably, the secondary water bar 112 comprises a herringbone water bar, and the angle of the herringbone water bar ranges from 110 degrees to 140 degrees.

Illustratively, the tertiary water bar 113 includes any shape of protrusion that can achieve water flow dispersion and water flow area enlargement, including but not limited to a horizontal line, a figure, an upwardly convex arc, a downwardly convex arc, a V, a rectangle, a circle, and the like. Preferably, the tertiary water bar 113 includes a herringbone water bar having an angle ranging from 120 degrees to 160 degrees.

Further, the distance between the lowest point of the third-stage water retaining strip 113 and the lower edge of the inclined plane of the tower plate ranges from 4mm to 6 mm.

A part of the wastewater flowing through the first-stage water bars 111 flows over the second-stage water bars 112, and a part of the wastewater flows along the second-stage water bars 112 from the middle part to the two sides and flows down through gaps between the second-stage water bars 112; the wastewater flowing through the secondary water bars 112 partially flows over the tertiary water bars 113, and partially flows from the middle to both sides along the tertiary water bars 113 and flows down through gaps between the tertiary water bars 113. When the angle of the herringbone water retaining strip is larger, the water flow can be better dispersed, and the speed of the water flow is delayed, so that the contact area and the contact time of steam and waste water are improved, the denitrification efficiency is improved, and the denitrification energy consumption is reduced.

The water flow after being fully dispersed by the one-to-three-stage water bars is in a dispersed state on the inclined plane 101 of the tower plate. The water flow after full dispersion is fully exchanged with the energy provided by steam in the water distribution area formed by the first-stage water retaining strip 111, the second-stage water retaining strip 112 and the third-stage water retaining strip 113 on the inclined plane 101 of the tower plate, wherein light components such as ammonia nitrogen and the like are separated from the wastewater, flow to the top of the tower through the tower plate gap 200, enter the upper-layer tower plate, and the wastewater after the denitrification tower plate treatment flows down from the tower plate gap 200 and enters the lower-layer tower plate, so that efficient denitrification is finally realized.

The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the invention to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A denitrification tower plate for an ammonia still is characterized in that the denitrification tower plate is formed by combining a plurality of angle steel units, and each angle steel unit comprises two intersecting planes and a common edge;

2. The denitrification tray of claim 1, wherein the water bars comprise a primary water bar, a secondary water bar and a tertiary water bar arranged from top to bottom.

3. The denitrification tray of claim 2, wherein the tray ramp includes a plurality of laterally disposed primary water bars with gaps between adjacent primary water bars; the tower plate inclined plane comprises a plurality of transversely arranged secondary water retaining strips, and a gap is formed between every two adjacent secondary water retaining strips; the tower plate inclined plane comprises a plurality of transversely arranged three-stage water retaining strips, and a gap exists between every two adjacent three-stage water retaining strips.

4. The denitrification tray according to claim 2, wherein the primary water bar comprises an arc-shaped water bar, the arc-shaped water bar is shaped as a downward convex arc, and the arc-shaped water bar corresponds to a circle center with an angle ranging from 100 degrees to 160 degrees.

5. The denitrification tray of claim 2, wherein the secondary water bars comprise herringbone water bars having an angle ranging from 110 degrees to 140 degrees.

6. The denitrification tray of claim 2, wherein the tertiary water bars comprise herringbone water bars, and the angle of the herringbone water bars ranges from 120 degrees to 160 degrees.

7. The denitrification tray of claim 2, wherein the distance between the lowest point of the primary water bars and the upper edge of the tray deck is in the range of 8mm to 10mm, and the distance between the lowest point of the tertiary water bars and the lower edge of the tray deck is in the range of 4mm to 6 mm.

8. The denitrification tray of claim 1, wherein the water distribution strip comprises a cylindrical shape and has a diameter in the range of 5mm to 8 mm.

9. The denitrification tray of claim 1, wherein the angle between the two intersecting planes is in the range of 30 degrees to 150 degrees.

10. The denitrification tray of claim 1, wherein a tray gap exists between adjacent angle steel units.