Inner wall cooling type hydration tower

Abstract

The utility model discloses an inner wall cooling type hydration tower and belongs to the technical field of phosphorus chemical industry. Comprising a tower body, a water cooling mechanism and a spray head, an overflow weir is coaxially arranged at the top in the tower body; the overflow weir is annular and is arranged on the inner wall of the tower body, liquid flowing out of the overflow weir flows downwards along the inner wall of the tower body, and the overflow weir is connected with the circulating pool. The tower body comprises a vertically arranged straight cylinder part and an expansion part coaxially arranged at the top of the straight cylinder part, and water cooling mechanisms are arranged on the outer walls of the straight cylinder part and the expansion part; the straight cylinder part is cylindrical, and the top end is open; the diameter of the expansion part is larger than that of the straight barrel part, the bottom end of the expansion part is open, and the bottom is a big-end-up conical barrel; the lower end of the conical cylinder is fixed outside the upper part of the straight cylinder part; the upper part of the straight barrel part upwards extends into the expansion part, the upper part and the conical barrel define an overflow weir, and the top end of the overflow weir is of a tooth-shaped structure. Liquid flowing out of the overflow weir flows downwards along the inner wall of the tower body, so that the hydration effect can be improved, and the inner wall of the tower body can be cooled.

Description

Technical Field

[0001] The utility model belongs to the technical field of phosphorus chemical industry, and particularly relates to an inner wall cooling type hydration tower. Background Art

[0002] Phosphoric acid is the basic raw material for preparing fine phosphates and other phosphorus chemical products, and is used in the petroleum, metallurgy, chemical, electronics, and pharmaceutical industries. Thermal phosphoric acid has high purity and is widely used in food, electronic chemicals, and medicine. Thermal phosphoric acid usually uses yellow phosphorus as fuel. After combustion, phosphorus pentoxide flue gas reacts with water in a hydration tower to obtain phosphoric acid.

[0003] For example, the patent with application number CN202110251250.2 discloses a thermal phosphoric acid full heat energy recovery system, including a phosphorus burning tower, wherein an air inlet is provided at the lower part of the phosphorus burning tower, yellow phosphorus and air enter the phosphorus burning tower through the air inlet, soft water enters the phosphorus burning tower from the upper head on the top of the phosphorus burning tower, one end of the air guide pipe is connected to the phosphorus burning tower, and the other end of the air guide pipe is connected to the top of the hydration tower, after the air guide pipe is heated, the soft water is transported to the deaerator through the pipeline and mixed with part of the steam, the water outlet of the deaerator is connected to the soft water inlet of the economizer through a water feed pump, the air outlet of the hydration tower is connected to the air inlet of the absorption tower, the polyphosphoric acid outlet of the hydration tower is connected to the polyphosphoric acid inlet of the economizer through a first phosphoric acid pump, the soft water outlet of the economizer is connected to the phosphorus burning tower drum through a pipeline, the steam outlet of the phosphorus burning tower drum is connected to the steam inlet of the sub-cylinder, and the steam outlet of the sub-cylinder is discharged Steam is discharged, the polyphosphoric acid outlet of the economizer is connected with the polyphosphoric acid inlet of the hydration tower, the phosphoric acid outlet of the absorption tower is connected with the phosphoric acid inlet of the hydration tower and the phosphoric acid inlet of the absorption tower respectively through the second phosphoric acid pump, the gas outlet of the absorption tower is connected with the air inlet end of the venturi tube, the gas outlet of the venturi tube is connected with the air inlet of the demister, the gas outlet of the demister discharges tail gas through the induced draft fan, the dilute phosphoric acid of the venturi tube is connected with the liquid inlet of the dilute acid circulation tank, and the liquid discharge port of the dilute acid circulation tank is connected with the liquid inlet of the venturi tube through the third phosphoric acid pump; soft water first enters the upper head and air guide pipe of the phosphorus burning tower for heating, and then enters the deaerator, and is pumped into the economizer by the feed water pump to recover the gas sensible heat brought into the hydration tower by the gas of the phosphorus burning tower and the hydration heat of phosphorus pentoxide, and then enters the steam drum of the phosphorus burning tower as boiler feed water, and steam of different pressure levels is generated by recovering the reaction heat of yellow phosphorus in the phosphorus burning tower.

[0004] The existing hydration tower includes a tower body, a water cooling mechanism on the outer wall of the tower body, and a nozzle in the tower body, etc. The nozzle is connected to the circulation pool through a pipeline. When using the existing hydration tower, the applicant found that the side wall of the hydration tower is prone to leakage, resulting in a short service life. Utility Model Content

[0005] The applicant found through research that the reason why the side wall of the hydration tower is prone to leakage is that the temperature of the phosphorus pentoxide flue gas itself is high, and its reaction with water is also an exothermic reaction, which leads to a high temperature in the hydration tower (although the outer wall of the hydration tower is equipped with a water cooling mechanism). High temperature and high concentration phosphoric acid (concentration reaches 85% and above) is highly corrosive to the metal tower body, especially at high temperature, which easily leads to tower leakage. This patent uses cold phosphoric acid to cool the inner wall of the tower body. The technical solution is as follows:

[0006] The utility model embodiment provides an inner wall cooling type hydration tower, comprising a tower body 1, a water cooling mechanism 2 on the outer wall of the tower body 1 and a nozzle 3 in the tower body 1, wherein the nozzle 3 is connected to a circulation pool through a pipeline; an overflow weir 4 is coaxially arranged at the top of the tower body 1; the overflow weir 4 is annular and is arranged on the inner wall of the tower body 1, and the liquid flowing out of the overflow weir flows downward along the inner wall of the tower body 1, and is connected to the circulation pool through a pipeline.

[0007] The bottom of the tower body 1 in the embodiment of the utility model is connected to the circulation pool through a pipeline with a heat exchanger, an air inlet is provided at the top, and an air outlet is provided at the bottom.

[0008] Among them, the nozzle 3 in the embodiment of the utility model includes a top nozzle 31 at the top of the tower body 1 and a multi-layer spray mechanism arranged side by side in the middle of the tower body 1; the top nozzle 31 is arranged at the axis of the tower body 1 and it is located above the overflow weir 4; each layer of the spray mechanism includes a plurality of middle nozzles 32 evenly distributed around the axis of the tower body 1, the middle nozzle 32 is arranged on the side wall of the tower body 1 and it is arranged toward the axis of the tower body 1, and the circulating pool is connected to the top nozzle 31, the middle nozzle 32 and the overflow weir 4 through a pipeline with an acid pump.

[0009] Among them, the tower body 1 in the embodiment of the utility model includes a vertically arranged straight cylinder part 11 and an expanded part 12 coaxially arranged on the top of the straight cylinder part 11, and the outer walls of the straight cylinder part 11 and the expanded part 12 are provided with a water cooling mechanism 2; the straight cylinder part 11 is cylindrical, and its top end is open; the diameter of the expanded part 12 is larger than the diameter of the straight cylinder part 11, and its bottom end is open, and its bottom is a conical cylinder 13 with a larger upper part and a smaller lower part; the lower end of the conical cylinder 13 is fixed to the outer side of the upper part of the straight cylinder part 11; the upper part of the straight cylinder part 11 extends upward into the expanded part 12, and its upper part and the conical cylinder 13 form an overflow weir 4, and its top end is a toothed structure 14; the top nozzle 31 is arranged in the expanded part 12, and the middle nozzle 32 is arranged in the straight cylinder part 11.

[0010] Furthermore, an acid inlet pipe 6 is provided on one side of the tower body 1 in the embodiment of the utility model along the vertical direction; the lower end of the acid inlet pipe 6 is connected to the circulation pool through a pipeline with an acid pump, and the upper end thereof is connected to the top nozzle 31 through a first pipeline 7 with a valve, and the upper part thereof is connected to the overflow weir 4 through one or more second pipelines 8 with valves, and the middle part thereof is connected to the middle nozzle 32 through a third pipeline 9 with a valve.

[0011] Furthermore, the spray mechanism in the embodiment of the utility model also includes an annular tube 33 coaxially arranged outside the tower body 1, the middle nozzle 32 is connected to the inner side of the annular tube 33 through a pipeline, and the annular tube 33 is connected to the acid inlet pipe 6 through a third pipeline 9; the number of the second pipelines 8 is two, and the two second pipelines 8 are respectively connected to the opposite sides of the lower part of the conical cylinder 13.

[0012] The beneficial effect brought about by the technical solution provided by the embodiment of the utility model is: the patent uses cold phosphoric acid to cool the inner wall of the tower body, allowing the liquid flowing out of the overflow weir to flow downward along the inner wall of the tower body, which can not only improve the hydration effect, but also cool the inner wall of the tower body, reduce the risk of leakage, and increase the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of an inner wall cooling type hydration tower in an embodiment of the utility model;

[0014] Figure 2 It is a principle block diagram of the inner wall cooling type hydration tower in the embodiment of the utility model.

[0015] In the figure: 1 tower body, 2 water cooling mechanism, 3 nozzle, 4 overflow weir, 5 ventilation pipe, 6 acid inlet pipe, 7 first pipeline, 8 second pipeline, 9 third pipeline;

[0016] 11 straight tube part, 12 expanded part, 13 conical tube, 14 toothed structure;

[0017] 31 top nozzle, 32 middle nozzle, 33 annular pipe. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0019] Example 1

[0020] See also Figure 1-2Embodiment 1 provides an inner wall cooling type hydration tower, comprising a tower body 1, a water cooling mechanism 2 on the outer wall of the tower body 1, a nozzle 3 in the tower body 1, and an acid inlet pipe 6 beside the tower body 1. The tower body 1 is arranged vertically, and its bottom is connected to the circulation pool through a pipeline with a heat exchanger, and its top is provided with an air inlet (connected to the phosphorus burning tower through a vent pipe 5), and its lower part is provided with an air outlet (connected to the next-level hydration tower or tail gas treatment system through a pipeline). The water cooling mechanism 2 can specifically be a water cooling jacket. The nozzle 3 includes a top nozzle 31 at the top of the tower body 1 and a multi-layer spray mechanism arranged side by side in the middle of the tower body 1. The top nozzle 31 is arranged at the axis of the tower body 1 and is located above the overflow weir 4. Each layer of the spray mechanism includes a plurality of middle nozzles 32 evenly distributed around the axis of the tower body 1 and an annular tube 33 coaxially arranged outside the tower body 1; the middle nozzle 32 is arranged on the side wall of the tower body 1, facing the axis of the tower body 1, and connected to the inner side of the annular tube 33 through a pipeline. An overflow weir 4 is coaxially arranged at the top of the tower body 1. The overflow weir 4 is annular and is arranged on the inner wall of the tower body 1. The liquid flowing out of the overflow weir flows downward along the inner wall of the tower body 1. The circulation pool is connected to the top nozzle 31, the middle nozzle 32 and the overflow weir 4 through a pipeline with an acid pump.

[0021] Specifically, see Figure 1 The tower body 1 in the embodiment of the utility model includes a vertically arranged straight cylinder portion 11 and an expanded portion 12 coaxially arranged on the top of the straight cylinder portion 11. A water cooling mechanism 2 is provided on the outer wall of the straight cylinder portion 11 and the expanded portion 12. The straight cylinder portion 11 is cylindrical, with an open top and a closed bottom. The diameter of the expanded portion 12 is larger than that of the straight cylinder portion 11, and its bottom is open, its top is closed, and its bottom is a conical cylinder 13 with a larger upper part and a smaller lower part. The lower end of the conical cylinder 13 is fixed to the outer side of the upper part of the straight cylinder portion 11. The upper part of the straight cylinder portion 11 extends upward into the expanded portion 12, and its upper part and the conical cylinder 13 form an overflow weir 4 (with a conical cross section), and its top is a toothed structure 15 to allow the liquid to be evenly distributed. The top nozzle 31 is arranged in the expanded part 12 , and the air inlet is arranged at the top of the expanded part 12 ; the middle nozzle 32 is arranged in the straight tube part 11 , and the air outlet is arranged at the lower part of the straight tube part 11 .

[0022] Specifically, the acid inlet pipe 6 in the embodiment of the utility model is arranged vertically, its lower end is connected to the circulation pool through a pipeline with an acid pump, its upper end is connected to the top spray head 31 through a first pipeline 7 with a valve, its upper part is connected to the overflow weir 4 through two second pipelines 8 with valves, and its middle part is connected to the annular pipe 33 through a third pipeline 9 with a valve. Preferably, the two second pipelines 8 are respectively connected to the opposite sides of the lower part of the cone 13.

[0023] Example 2

[0024] Embodiment 2 provides an inner wall cooling type hydration tower, and its structure is basically the same as that of embodiment 1, except that: the number of layers of the spray mechanism in this embodiment is 2, and each layer of the spray mechanism includes 3 middle nozzles 32. The diameter of the tower body 1 is 1.8m, the height is 14m, the height of the straight tube part 11 is 1m, and the length of the straight tube part 11 extending into the expanded part 12 is 55mm.

[0025] Among them, "first", "second" and "third" in this embodiment are only used for distinction and have no other special meanings.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An inner wall cooling type hydration tower, comprising a tower body (1), a water cooling mechanism (2) on the outer wall of the tower body (1), and a nozzle (3) in the tower body (1), wherein the nozzle (3) is connected to a circulation pool through a pipeline; characterized in that: An overflow weir (4) is coaxially arranged at the top of the tower body (1); the overflow weir (4) is annular and arranged on the inner wall of the tower body (1); the liquid flowing out of the overflow weir flows downward along the inner wall of the tower body (1) and is connected to a circulation pool through a pipeline.

2. The inner wall cooling type hydration tower according to claim 1, characterized in that: The bottom of the tower body (1) is connected to the circulation pool via a pipeline with a heat exchanger, and an air inlet is provided at the top and an air outlet is provided at the bottom.

3. The inner wall cooling type hydration tower according to claim 2, characterized in that: The spray head (3) comprises a top spray head (31) at the top of the tower body (1) and a plurality of spray mechanisms arranged side by side in the middle of the tower body (1); the top spray head (31) is arranged at the axis of the tower body (1) and is located above the overflow weir (4); each layer of the spray mechanism comprises a plurality of middle spray heads (32) evenly distributed around the axis of the tower body (1); the middle spray heads (32) are arranged on the side wall of the tower body (1) and are arranged toward the axis of the tower body (1); and the circulation pool is connected to the top spray head (31), the middle spray heads (32) and the overflow weir (4) through a pipeline with an acid pump.

4. The inner wall cooling type hydration tower according to claim 3, characterized in that: The tower body (1) comprises a vertically arranged straight cylinder portion (11) and an expanded portion (12) coaxially arranged at the top of the straight cylinder portion (11), and the outer walls of the straight cylinder portion (11) and the expanded portion (12) are both provided with a water cooling mechanism (2); the straight cylinder portion (11) is cylindrical, and its top end is open; the diameter of the expanded portion (12) is larger than that of the straight cylinder portion (11), its bottom end is open, and its bottom is a cone (13) with a larger top and a smaller bottom; the lower end of the cone (13) is fixed to the outer side of the upper part of the straight cylinder portion (11); the upper part of the straight cylinder portion (11) extends upward into the expanded portion (12), and its upper part and the cone (13) form an overflow weir (4), and its top end is a toothed structure (14); the top nozzle (31) is arranged in the expanded portion (12), and the middle nozzle (32) is arranged in the straight cylinder portion (11).

5. The inner wall cooling type hydration tower according to claim 4, characterized in that: An acid inlet pipe (6) is vertically arranged on one side of the tower body (1); the lower end of the acid inlet pipe (6) is connected to a circulation pool via a pipeline with an acid pump, the upper end of the acid inlet pipe (6) is connected to a top nozzle (31) via a first pipeline (7) with a valve, the upper part of the acid inlet pipe is connected to an overflow weir (4) via one or more second pipelines (8) with valves, and the middle part of the acid inlet pipe is connected to a middle nozzle (32) via a third pipeline (9) with a valve.

6. The inner wall cooling type hydration tower according to claim 5, characterized in that: The spray mechanism further comprises an annular pipe (33) coaxially arranged outside the tower body (1); the middle nozzle (32) is connected to the inner side of the annular pipe (33) via a pipeline; the annular pipe (33) is connected to the acid inlet pipe (6) via a third pipeline (9); the number of the second pipelines (8) is two, and the two second pipelines (8) are respectively connected to opposite sides of the lower part of the conical cylinder (13).

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