CN219502712U - Steam injection device for polyaluminium chloride reaction tank - Google Patents

Abstract

The utility model relates to a steam injection device for a polyaluminium chloride reaction tank, which comprises a steam injection pipe and a steam spray nozzle, wherein the steam injection pipe is arranged at the tank top of the polyaluminium chloride reaction tank and comprises a first flushing part and a first connecting part which are arranged opposite to each other, the first flushing part is arranged towards a stirring assembly, the wall thickness of the first flushing part is larger than that of the first connecting part, the steam spray nozzle is communicated with the steam injection pipe, the steam spray nozzle is uniformly provided with spray holes, and the spray holes can spray steam towards the direction deviating from the first flushing part so as to offset the flushing force suffered by the steam injection device for the polyaluminium chloride reaction tank. By means of the arrangement, the strength of the steam injection pipe is increased, steam is injected stably, collision and vibration of the steam and feed liquid are reduced, erosion of the flushing force to the steam injection device of the polyaluminium chloride reaction tank is counteracted, the service life is prolonged, impact to an anticorrosive coating of the polyaluminium chloride reaction tank is reduced, and maintenance cost is reduced.

Description

Steam injection device for polyaluminium chloride reaction tank

Technical Field

The utility model relates to the technical field of chemical equipment, in particular to a steam injection device for a polyaluminium chloride reaction tank.

Background

Polyaluminium chloride, namely polyaluminium for short, is an inorganic high molecular coagulant, has high electric neutralization and bridging effects on colloid and particulate matters in water, can be applied to the field of water purification, and can powerfully remove micro toxic substances and heavy metal ions in sewage.

In the preparation of polyaluminium chloride, this is achieved in two steps: firstly, reacting aluminum hydroxide with hydrochloric acid solution at a certain temperature and pressure to obtain aluminum chloride solution; and secondly, adding calcium aluminate into the aluminum chloride solution according to the basicity requirement, and reacting the calcium aluminate with the aluminum chloride solution to generate the composite polyaluminum chloride. In the two-step reaction, the reaction tank is used as a reaction container, and steam needs to be injected to achieve the effects of rising temperature before the reaction and regulating temperature in the reaction.

In the prior art, when steam is injected into a polyaluminium chloride reaction tank, the following defects exist:

1. the corrosion-resistant layer of the reaction tank is impacted and damaged, so that the maintenance cost is increased;

2. the injected steam can be mixed with the feed liquid to vibrate;

3. because the material liquid can wash the steam injection device during stirring, the generated washing force can lead the steam injection device to generate distortion and deformation, and the service life of the steam injection device is shortened.

Therefore, a steam injection device for a polyaluminum chloride reaction tank is needed to solve the above technical problems.

Disclosure of Invention

The utility model aims to provide a steam injection device for a polyaluminium chloride reaction tank, which aims to solve the problems of damage of an anticorrosive coating of the reaction tank, vibration and distortion of the steam injection device caused by the existing steam injection device.

To achieve the above object, the present utility model provides a steam injection apparatus for a polyaluminum chloride reaction tank, comprising:

the steam injection pipe is arranged at the top of the polyaluminum chloride reaction tank and comprises a first flushing part and a first connecting part, wherein the first flushing part and the first connecting part are arranged opposite to each other, the first flushing part is configured to be arranged towards the stirring assembly, and the wall thickness of the first flushing part is larger than that of the first connecting part;

the steam spray nozzle is communicated with the steam injection pipe, injection holes are uniformly formed in the steam spray nozzle, and each injection hole can spray steam towards the direction deviating from the first flushing part so as to offset flushing force born by the steam injection device of the polyaluminium chloride reaction tank.

Further, the steam nozzle is in a bent cone shape, is concavely bent along the direction deviating from the steam injection pipe and gradually reduces in size, and the injection holes are uniformly arranged along the bending direction of the steam nozzle.

Further, the included angle between any adjacent spray holes is 4-10 degrees along the bending direction of the steam spray head.

Further, an angle of a maximum included angle between the injection holes is less than or equal to 70 ° in a bending direction of the steam spray head.

Further, a minimum included angle from the injection hole to a communication area of the steam nozzle and the steam injection pipe is 10 DEG to 15 DEG along a bending direction of the steam nozzle.

Further, the steam nozzle comprises a first contour line and a second contour line which are concentrically arranged, and the injection holes are uniformly arranged along the radial line direction of the first contour line and the second contour line.

Further, along the radial line of the first contour line and the second contour line and in the direction deviating from the circle center, the aperture of the injection hole is gradually increased.

Further, on each section of the steam nozzle, which is obtained along the radial line of the first contour line and the radial line of the second contour line, each injection hole is symmetrically arranged, and the central axis of each injection hole intersects with the center of the section.

Further, the steam nozzle comprises a second flushing part and a second connecting part, wherein the second flushing part and the second connecting part are arranged opposite to each other, the second flushing part is configured to be arranged towards the stirring assembly, and each injection hole is formed in the second connecting part.

Further, the total area of the openings of the injection holes is larger than the cross-sectional area of the steam injection pipe.

The beneficial effects of the utility model are as follows:

the steam injection device for the polyaluminium chloride reaction tank comprises a steam injection pipe and a steam spray nozzle, wherein the steam injection pipe is arranged at the tank top of the polyaluminium chloride reaction tank and comprises a first flushing part and a first connecting part which are arranged opposite to each other, the first flushing part is arranged towards a stirring assembly, the wall thickness of the first flushing part is larger than that of the first connecting part, the steam spray nozzle is communicated with the steam injection pipe, the steam spray nozzle is uniformly provided with spray holes, and each spray hole can spray steam towards the direction deviating from the first flushing part so as to offset the flushing force suffered by the steam injection device for the polyaluminium chloride reaction tank. The wall thickness of the first flushing part is larger than that of the first connecting part, so that the strength of the steam injection pipe is increased, the steam injection pipe has better corrosion resistance, bending deformation caused by long-term flushing is avoided, and the service life is prolonged; the steam spray heads are uniformly provided with the spray holes, so that steam is stably injected, the collision and vibration of the steam and the feed liquid are reduced, and the service life is prolonged; the arrangement of the spray hole can offset the erosion of the erosion force to the steam injection device of the polyaluminium chloride reaction tank, prolong the service life of the steam injection device, reduce the impact to the corrosion-resistant layer of the polyaluminium chloride reaction tank and reduce the maintenance cost.

Drawings

Fig. 1 is a schematic structural view of a steam injection device for a polyaluminum chloride reaction tank according to an embodiment of the present utility model;

FIG. 2 is a front view of a steam injection pipe provided by an embodiment of the present utility model;

FIG. 3 is a cross-sectional view of a steam injection pipe taken along line A-A in FIG. 2 and a stress analysis chart according to an embodiment of the present utility model;

FIG. 4 is a schematic view of a steam nozzle according to an embodiment of the present utility model;

FIG. 5 is a front view of a vapor head provided in an embodiment of the utility model;

FIG. 6 is a cross-sectional view of a vapor jet head provided in accordance with an embodiment of the present utility model taken along line B-B of FIG. 5;

FIG. 7 is a cross-sectional view of a vapor jet head provided in accordance with an embodiment of the utility model taken along line C-C of FIG. 5;

FIG. 8 is a force analysis chart of a vapor jet head provided by an embodiment of the present utility model.

In the figure:

100-steam injection means; 200-polyaluminium chloride reaction tanks; 300-stirring assembly; 301-stirring blades; 302, a stirring shaft; 303-a stirring motor;

1-a steam injection pipe; 2-a steam nozzle; 3-a conversion head;

11-a first flushing part; 12-a first connection; 13-hollow cavity; 21-injection holes; 22-communicating portions; 23-opening portions; 24-a second flushing part; 25-a second connection; 26-a first contour line; 27-a second contour line.

Detailed Description

The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present utility model are shown.

In the present utility model, directional terms such as "upper", "lower", "left", "right", "inner" and "outer" are used for convenience of understanding, and thus do not limit the scope of the present utility model unless otherwise specified.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The embodiment provides a steam injection device 100 for a polyaluminum chloride reaction tank, which is arranged in the preparation process of polyaluminum chloride and is used for injecting steam into the polyaluminum chloride reaction tank 200 so as to achieve the effects of heating before reaction and temperature regulation in reaction.

In order to better understand the technical scheme related to the embodiment, equipment needed in the preparation process of polyaluminum chloride needs to be introduced first. As shown in fig. 1, a feed liquid (solid-liquid mixed state) is fed into a polyaluminium chloride reaction tank 200, a stirring assembly 300 is rotatably provided in the polyaluminium chloride reaction tank 200 for stirring the feed liquid, a steam injection device 100 is installed at the top of the polyaluminium chloride reaction tank 200, steam is injected from the top of the polyaluminium chloride reaction tank 200, and the steam injection device 100 is partially immersed in the feed liquid.

Further, the stirring assembly 300 comprises a stirring blade 301, a stirring shaft 302 and a stirring motor 303, the stirring motor 303 is installed outside the polyaluminium chloride reaction tank 200, the output end of the stirring motor 303 is connected with the stirring shaft 302, the stirring blade 301 is installed on the stirring shaft 302, and the stirring blade 301 is immersed in the feed liquid to stir the feed liquid uniformly. An impact force is generated during the stirring process, and the impact force impacts the steam injection device 100.

Further, the steam injection device 100 includes a steam injection pipe 1 and a steam nozzle 2, the steam injection pipe 1 is installed on the top of the polyaluminium chloride reaction tank 200, the steam injection pipe 1 includes a first flushing part 11 and a first connecting part 12 which are opposite to each other, the first flushing part 11 is configured to be arranged towards the stirring assembly 300, the wall thickness of the first flushing part 11 is greater than that of the first connecting part 12, the steam nozzle 2 is communicated with the steam injection pipe 1, the steam nozzle 2 is uniformly provided with injection holes 21, and each injection hole 21 can inject steam towards the direction deviating from the first flushing part so as to counteract the flushing force suffered by the steam injection device 100 for the polyaluminium chloride reaction tank. The wall thickness of the first flushing part 11 is larger than that of the first connecting part 12, so that the strength of the steam injection pipe 1 is increased, the steam injection pipe is better in corrosion resistance, bending deformation caused by long-term flushing is avoided, and the service life is prolonged; the steam spray nozzle 2 is uniformly provided with the spray holes 21, so that steam is injected stably, collision and vibration between the steam and feed liquid are reduced, and the service life is prolonged; the arrangement of the spray hole 21 can offset the erosion of the steam injection device 100 of the polyaluminum chloride reaction tank by the scouring force, prolong the service life of the steam injection device, reduce the impact on the anticorrosive coating of the polyaluminum chloride reaction tank 200 and reduce the maintenance cost.

In this embodiment, the first flushing part 11 is disposed towards the stirring assembly 300, which means that the direction of the impact force generated by the stirring of the material liquid by the first flushing part 11 and the stirring assembly 300 is opposite.

Specifically, the horizontal component of the reaction force of the steam injected from the injection hole 21 is equal to the flushing force applied to the steam injection device 100 for the polyaluminum chloride reaction tank, so that the flushing is reduced and the service life is prolonged.

Further, the steam injection apparatus 100 further includes a switching head 3, and the switching head 3 communicates with the steam injection pipe 1.

Further, the steam injection pipe 1 is located between the stirring blade 301 and the wall of the polyaluminum chloride reaction tank 200 so as not to interfere with the movement of the stirring blade 301.

Specifically, the steam injection pipe 1 may be as close to the core of the polyaluminum chloride reaction tank 200 as possible without affecting the stirring of the stirring blade 301, so as to reduce damage of the wall of the polyaluminum chloride reaction tank 200 by the steam.

Further, in the radial direction of the steam injection pipe 1, the closest distance from the central axis of the steam injection pipe 1 to the edge of the stirring blade 301 is S1, and the minimum distance from the edge of the stirring blade 301 to the wall of the polyaluminum chloride reaction tank 200 is S, with S1 being 0.2 to 0.5 times S.

Preferably, in practice, when s1=s/3, the steam injection pipe 1 is most suitably positioned, and neither damage is caused to the wall of the polyaluminum chloride reaction tank 200 nor the stirring of the stirring blade 301 is affected at all.

Further, the distance between the steam injection device 100 and the bottom of the polyaluminium chloride reaction tank 200 is h, and when h is more than or equal to 300mm, the erosion of the steam injection to the corrosion-resistant layer of the bottom of the polyaluminium chloride reaction tank 200 can be reduced, and the maintenance cost is reduced.

As shown in fig. 2 and 3, the steam injection pipe 1 is a straight pipe, and has a hollow cavity 13, and steam can flow in the hollow cavity 13.

Further, the cross section of the steam injection pipe 1 is in an irregular shape, the outer contour is in a table tennis racket shape, the inner contour is in a jujube pit shape, and therefore the first flushing part 11 and the first connecting part 12 which are integrally formed are formed, the wall thickness of the first connecting part 12 is basically consistent, and the wall thickness of the first flushing part 11 is gradually thicker from two sides to the middle. The arrangement can reduce the scouring force, and is especially suitable for feed liquid in a solid-liquid mixed state. Meanwhile, the thickened first flushing part 11 has higher strength and better flushing resistance, avoids bending deformation caused by flushing of feed liquid for a long time, and prolongs the service life of the first flushing part.

As shown in fig. 4 to 8, the steam nozzle 2 has a bent cone shape and is concavely curved in a direction away from the steam injection pipe 1 and gradually decreases in size, and the injection holes 21 are uniformly provided in the curved direction of the steam nozzle 2. The jet holes 21 are uniformly arranged, so that stable steam injection can be ensured, collision and vibration with feed liquid are reduced, and the service life is prolonged. In other words, the included angle between any adjacent injection holes 21 is the same in the bending direction of the steam nozzle 2.

As shown in fig. 4, the steam nozzle 2 includes a communication portion 22 and an opening portion 23 integrally formed, and the injection hole 21 is opened in the opening portion 23, and the communication portion 22 is connected to the steam injection pipe 1. The steam flows into the steam injection device 100 from the steam injection pipe 1, flows through the communication portion 22, and is ejected from the ejection hole 21 and enters the polyaluminum chloride reaction tank 200.

As shown in fig. 5, the steam nozzle 2 includes a first contour line 26 and a second contour line 27 concentrically arranged, and the first contour line 26 and the second contour line 27 are rounded curves and are concavely curved in a direction away from the steam injection pipe 1. The first contour line 26 and the second contour line 27 are coaxial with the center O1, and the injection holes 21 are uniformly arranged along the radial line O1d of the first contour line 26 and the second contour line 27.

Further, the aperture of the injection hole 21 increases along the radial line O1d of the first contour line 26 and the second contour line 27 in a direction away from the center O1. According to the triangle-shaped stability principle, the aperture of jet orifice 21 gradually enlarges, and the steam sprays more evenly like this, and the reaction force of steam is more even, and the atress gradient of vapor nozzle 2 changes relatively slowly, prevents the vibration that the atress is suddenly changed and causes, prevents the emergence of stress concentration simultaneously, prolongs vapor nozzle 2's life.

Further, the included angle between any adjacent injection holes 21 is 4 ° -10 ° in the bending direction of the steam nozzle 2. The even distribution of the spray holes 21 can ensure the stable injection of steam, reduce the collision and vibration of the steam nozzle 2 and the feed liquid, and prolong the service life of the steam nozzle 2. The range of the included angle between any two adjacent spray holes 21 is arranged, so that the steam spray head 2 can be conveniently manufactured and processed, and the manufacturing difficulty is reduced. Specifically, the included angle between any adjacent injection holes 21 is preferably 6 °.

Further, in the bending direction of the steam nozzle 2, the angle of the maximum included angle between the injection holes 21 is less than or equal to 70 °, that is, the angular range P of the openings of the opening portion 23 is equal to or less than 70 ° (as shown in fig. 5).

Further, in the bending direction of the steam nozzle 2, the minimum angle of the injection hole 21 to the communication area of the steam nozzle 2 and the steam injection pipe 1 is 10 ° -15 °, i.e., the angular range N of the non-perforated hole of the communication portion 22 is 10 ° -15 °. Such an arrangement may facilitate the communication of the steam nozzle 2 with the steam injection pipe 1.

Specifically, in this embodiment, as shown in fig. 5, 6 and 7, three groups of injection holes 21 with different apertures are provided along the radial line O1d direction of the first contour line 26 and the second contour line 27, and a plurality of injection holes 21 are uniformly provided along the bending direction of the steam nozzle 2 in each group of injection holes 21, and the aperture sizes of the injection holes 21 are as follows: Φe1< Φe2< Φe3. By the arrangement, the stress gradient change of the steam nozzle 2 is relatively mild, vibration caused by stress mutation is prevented, stress concentration is prevented, and the service life of the steam nozzle 2 is prolonged.

Further, the steam nozzle 2 is symmetrically disposed in each of the cut-off sections (as shown in fig. 6 and 7) along the radial line O1d of the first contour line 26 and the second contour line 27, and the center axes of the injection holes 21 meet at the center of the cut-off sections (such as O2 of fig. 6 and O3 of fig. 7). This arrangement allows the horizontal component of the reaction force generated by the steam injection to be reversed from the flushing force received by the steam injection apparatus 100.

Further, the steam nozzle 2 includes a second flushing part 24 and a second connecting part 25 which are disposed opposite to each other, the second flushing part 24 is configured to be disposed toward the stirring assembly 300, and each injection hole 21 is opened on the second connecting part 25. Specifically, the second flushing part 24 corresponds to the first flushing part 11, and the second connecting part 25 corresponds to the first connecting part 12.

In this embodiment, the second flushing part 24 is configured to be disposed towards the stirring assembly 300, which means that the direction of the impact force generated by stirring the feed liquid by the second flushing part 24 and the stirring assembly 300 is opposite.

Further, the steam nozzle 2 has a similar and irregular shape to the cross section of the steam injection pipe 1 along the radial line O1d of the first contour line 26 and the second contour line 27, and has an outer contour in the shape of a table tennis racket and an inner contour in the shape of a jujube pit, so that the second flushing part 24 and the second connecting part 25 are integrally formed, the wall thickness of the second connecting part 25 is basically consistent, and the wall thickness of the second flushing part 24 is gradually thicker from two sides to the middle. The arrangement can reduce the scouring force, and is especially suitable for feed liquid in a solid-liquid mixed state.

Further, the total area of the openings of the respective injection holes 21 is larger than the cross-sectional area of the steam injection pipe 1. By means of the arrangement, the flow speed of steam injection can be reduced, steam is injected into the polyaluminium chloride reaction tank 200 stably, collision vibration of the steam and feed liquid is dispersed more, circumferential offset is reduced step by step, steam injection in the polyaluminium chloride reaction tank 200 is enabled to be stable, reliable and controllable, the injection mode is simple and convenient to manufacture, low in cost and long in service life, maintenance and maintenance cost are reduced, and accordingly production cost is reduced.

Preferably, in practice, the steam injection is most smooth when the total area of the openings of the respective injection holes 21 is 1.2 to 1.5 times the cross-sectional area of the steam injection pipe 1.

As shown in fig. 3 and 8, in the stress analysis diagrams of the steam injection pipe 1 and the steam nozzle 2, the total scouring force applied to the steam injection pipe 1 and the steam nozzle 2 is Fs, the horizontal component of the reaction force of the steam injected from the injection hole 21 is Fz, fs=fz, so that the scouring force can offset the erosion of the steam injection device 100 of the polyaluminium chloride reaction tank, the service life of the steam injection device is prolonged, the impact on the corrosion prevention layer of the polyaluminium chloride reaction tank 200 is reduced, and the maintenance cost is reduced.

While the utility model has been described in detail in the foregoing general description, embodiments and experiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the utility model and are intended to be within the scope of the utility model as claimed.

Claims (10)

1. A steam injection apparatus for a polyaluminum chloride reaction tank, comprising:

a steam injection pipe (1) mounted on a tank top of a polyaluminum chloride reaction tank (200), the steam injection pipe (1) comprising a first flushing part (11) and a first connecting part (12) which are arranged oppositely, wherein the first flushing part (11) is configured to be arranged towards a stirring assembly (300), and the wall thickness of the first flushing part (11) is larger than that of the first connecting part (12);

the steam spray nozzle (2) is communicated with the steam injection pipe (1), spray holes (21) are uniformly formed in the steam spray nozzle (2), and each spray hole (21) can spray steam towards the direction deviating from the first flushing part (11) so as to offset flushing force born by the steam injection device of the polyaluminium chloride reaction tank.

2. The steam injection device for a polyaluminum chloride reaction tank according to claim 1, wherein the steam spray head (2) is in a bent cone shape, is concavely bent in a direction away from the steam injection pipe (1) and is gradually reduced in size, and the injection holes (21) are uniformly arranged along the bending direction of the steam spray head (2).

3. Steam injection device for polyaluminum chloride reaction cells according to claim 2, characterized in that the angle between any adjacent injection holes (21) is 4 ° -10 ° in the bending direction of the steam nozzle (2).

4. The steam injection device for a polyaluminum chloride reaction tank according to claim 2, wherein an angle of a maximum included angle between the injection holes (21) is less than or equal to 70 ° in a bending direction of the steam nozzle (2).

5. Steam injection device for polyaluminum chloride reaction cells according to claim 2, characterized in that the minimum angle of the injection hole (21) to the communication area of the steam nozzle (2) and the steam injection pipe (1) is 10 ° -15 ° in the bending direction of the steam nozzle (2).

6. The steam injection device for a polyaluminum chloride reaction tank according to claim 2, wherein the steam spray head (2) comprises a first contour line (26) and a second contour line (27) which are concentrically arranged, and the injection holes (21) are uniformly arranged along the radial line direction of the first contour line (26) and the second contour line (27).

7. The steam injection device for a polyaluminum chloride reaction cell according to claim 6, wherein the hole diameter of the injection hole (21) is gradually increased along a radial line of the first contour line (26) and the second contour line (27) and away from the center of the circle.

8. The steam injection device for a polyaluminum chloride reaction tank according to claim 6, wherein the steam spray head (2) is symmetrically arranged on each cut section taken along radial lines of the first contour line (26) and the second contour line (27), each injection hole (21) is intersected on the center of the cut section, and the central axes of the injection holes (21) are intersected on the center of the cut section.

9. The steam injection device for a polyaluminum chloride reaction tank according to claim 1, wherein the steam spray head (2) comprises a second flushing part (24) and a second connecting part (25) which are arranged opposite to each other, the second flushing part (24) is configured to be arranged towards a stirring assembly (300), and each injection hole (21) is arranged on the second connecting part (25).

10. The steam injection device for a polyaluminum chloride reaction cell according to claim 1, wherein the total area of the openings of the injection holes (21) is larger than the cross-sectional area of the steam injection pipe (1).