Phosphoric acid hydration device

Abstract

The utility model discloses a phosphoric acid hydration device and belongs to the technical field of phosphorus chemical industry. Comprising a first hydration structure, a second hydration structure and a circulating water supply structure, the first hydration structure comprises a first heat exchanger, a first hydration tower and a first circulating pool which are connected end to end, a cooling jacket is arranged outside the second hydration tower, and the cooling jacket is connected with the circulating water supply structure through a pipeline; a water cooling jacket is not arranged outside the first hydration tower, an outer water cooling mechanism is arranged at the outer top of the first hydration tower, a water receiving tank is arranged at the outer bottom of the first hydration tower, and a plurality of guide tanks are sequentially arranged outside the first hydration tower and between the water receiving tank and the outer water cooling mechanism from bottom to top; the outer water cooling mechanism is arranged around the first hydration tower, and water sprayed by the outer water cooling mechanism flows downwards along the outer wall of the first hydration tower; the water receiving tank and the guide tank are conical tanks with large upper parts and small lower parts, an annular gap is formed between the bottom of the guide tank and the first hydration tower, the bottom of the water receiving tank is connected with a circulating water supply structure through a pipeline, and the circulating water supply structure is connected with an external water cooling mechanism through a pipeline with a pump.

Description

Technical Field

[0001] The utility model belongs to the technical field of phosphorus chemical industry, and particularly relates to a phosphoric acid hydration device. Two hydration towers adopt different water cooling methods. Background Art

[0002] The production process of thermal phosphoric acid is mainly divided into three relatively independent processes: smelting (extracting yellow phosphorus from phosphate rock), yellow phosphorus combustion, and phosphorus pentoxide hydration. The steps of yellow phosphorus combustion are as follows: solid yellow phosphorus is heated by water vapor in the phosphorus melting tank to melt into liquid yellow phosphorus, and the liquid yellow phosphorus is sprayed into the combustion tower by a phosphorus spray gun under the action of compressed air for atomization and combustion. The combustion tail gas is sent to the hydration tower for circulation and heat exchange.

[0003] For example, the patent with application number CN201420317868.X discloses a polyphosphoric acid production system, including a refined molten phosphorus tank, a precipitated molten phosphorus tank, a combustion tower, a primary hydration structure, a secondary hydration structure, a dearsenicization reactor, a sedimentation tank, a plate and frame filter, a desorption reactor, a filter and a finished product storage tank connected in sequence by pipelines, the flue gas outlet of the secondary hydration structure is connected to a waste gas treatment system, the primary hydration structure and the secondary hydration structure are both self-circulating structures composed of pipelines, a hydration tower, a shell-and-tube heat exchanger, a circulation pump and a circulation pool, the circulation pool is provided with a detection port, and the circulation pump is electrically connected to an electric control box. That is, the existing phosphoric acid production system includes a first hydration structure, a second hydration structure and a circulating water supply structure, etc. The first hydration structure includes a first heat exchanger, a first hydration tower and a first circulation pool connected end to end, and the second hydration structure includes a second heat exchanger, a second hydration tower and a second circulation pool connected end to end. The exhaust port of the first hydration tower is connected to the air inlet of the second hydration tower through a pipeline. The first hydration tower and the second hydration tower are provided with cooling jackets outside, and the cooling jackets are connected to the circulating water supply structure through pipelines.

[0004] The applicant found that the acid concentration in the first hydration tower is high (usually 85-116% in terms of phosphoric acid) and the temperature is high (about 80°C for preparing low-concentration phosphoric acid and about 140°C for preparing high-concentration phosphoric acid (polyphosphoric acid); the acid concentration in the second hydration tower is low (usually about 30%) and the temperature is low. This makes the first hydration tower particularly prone to leakage. However, the first hydration tower is equipped with a cooling jacket, so the leakage point cannot be observed. Summary of the invention

[0005] In order to solve the above problems, the embodiment of the utility model provides a phosphoric acid hydration device, which does not have a cooling jacket, and determines whether the first hydration tower is leaking by observing whether the surface of the first hydration tower is obviously scaled (the applicant has found that if there is leakage, obvious scaling patches will appear). The technical solution is as follows:

[0006] The utility model embodiment provides a phosphoric acid hydration device, including a first hydration structure, a second hydration structure and a circulating water supply structure, wherein the first hydration structure includes a first heat exchanger, a first hydration tower 1 and a first circulation pool connected end to end, the second hydration structure includes a second heat exchanger, a second hydration tower and a second circulation pool connected end to end, the exhaust port of the first hydration tower 1 is connected to the air inlet of the second hydration tower through a pipeline, the second hydration tower is provided with a cooling jacket outside, and the cooling jacket is connected to the circulating water supply structure through a pipeline; the first hydration tower 1 is not provided with a water cooling jacket outside A sleeve is provided with an external water cooling mechanism on its outer top, a water receiving groove 4 is provided on its outer bottom, and a plurality of guide grooves 5 are provided outside and between the water receiving groove 4 and the external water cooling mechanism from bottom to top; the external water cooling mechanism is arranged around the first hydration tower 1 and the water sprayed therefrom flows downward along the outer wall of the first hydration tower 1; the water receiving groove 4 and the guide groove 5 are both conical grooves with a larger upper part and a smaller lower part, and an annular gap is provided between the bottom of the guide groove 5 and the first hydration tower 1, the bottom of the water receiving groove 4 is connected to a circulating water supply structure through a pipeline, and the circulating water supply structure is connected to the external water cooling mechanism through a pipeline with a pump.

[0007] Specifically, the water receiving trough 4 and the guide trough 5 in the embodiment of the utility model are both conical troughs coaxially arranged with the first hydration tower 1, and their tops are open; the bottom of the water receiving trough 4 is fixed on the first hydration tower 1, and the bottom of the guide trough 5 is located on the adjacent outer side of the first hydration tower 1.

[0008] Furthermore, the guide groove 5 in the embodiment of the utility model is fixed on the first hydration tower 1 or on a bracket next to the first hydration tower 1, and a pull rod 8 is provided between the inner walls of the water receiving groove 4 and the guide groove 5 and the first hydration tower 1, and the pull rod 8 is arranged obliquely outward from top to bottom.

[0009] Preferably, the bottom of the guide groove 5 in the embodiment of the utility model is provided with a soft guide tube 6 that cooperates with it; the soft guide tube 6 is vertically arranged, and its upper end is fixed to the bottom of the guide groove 5. It is sleeved outside the first hydration tower 1, and there is a gap between it and the first hydration tower 1, and a disconnection seam is provided on it along the vertical direction.

[0010] Specifically, the soft guide tube 6 in the embodiment of the utility model is a canvas tube, and its length is 0.5-1.5m.

[0011] Among them, the external water cooling mechanism in the embodiment of the utility model includes at least one annular tube 2. If there are multiple annular tubes 2, the multiple annular tubes 2 are arranged side by side up and down; the annular tube 2 is coaxially arranged outside the first hydration tower 1, and its inner wall has multiple spray holes evenly distributed, which is connected to the circulating water supply structure through a pipeline with a pump.

[0012] Furthermore, the external water cooling mechanism in the embodiment of the utility model also includes a splash shield bracket 7 on the first hydration tower and a splash shield 3 on the splash shield bracket 7; the splash shield 3 is a cone with a small top and a large bottom, an open bottom, an upper end fixed on the first hydration tower 1, and a lower part overlapped on the splash shield bracket 7, which shields the annular tube 2.

[0013] The splash shield support 7 in the embodiment of the utility model is an annular frame coaxially arranged with the first hydration tower 1 , which is fixed on the first hydration tower 1 and is located outside and above the annular tube 2 .

[0014] Furthermore, a sampling port is provided at the top of the cooling jacket of the second hydration tower in the embodiment of the utility model, and the sampling port overflows to the circulating water supply structure and is connected to the circulating water supply structure through a pipeline.

[0015] The technical solution provided by the embodiment of the utility model has the following beneficial effects: the first hydration tower in the embodiment is cooled by external cooling, and no cooling jacket is provided. Whether the first hydration tower is leaking and the leaking position is found by observing whether the surface of the first hydration tower is obviously scaled. The cooling water is guided to flow along the outer wall of the first hydration tower by the guide groove and the soft guide cylinder to ensure the cooling effect. A disconnection seam is provided on the soft guide cylinder so that the soft guide cylinder can be turned up, and then the surface of the first hydration tower is observed to be scaled. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a principle block diagram of the phosphoric acid hydration device in the embodiment of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the first hydration tower in the embodiment of the utility model.

[0018] In the figure: 1 first hydration tower, 2 annular pipe, 3 splash shield, 4 water receiving trough, 5 guide groove, 6 soft guide cylinder, 7 splash shield bracket, 8 pull rod. DETAILED DESCRIPTION

[0019] 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.

[0020] Example 1

[0021] See also Figure 1-2Embodiment 1 provides a phosphoric acid hydration device, which includes a first hydration structure, a second hydration structure and a circulating water supply structure, etc. The first hydration structure includes a first heat exchanger, a first hydration tower 1 and a first circulation pool connected end to end, etc. The second hydration structure includes a second heat exchanger, a second hydration tower and a second circulation pool connected end to end, etc. The exhaust port of the first hydration tower 1 is connected to the air inlet of the second hydration tower through a pipeline, and the second circulation pool is connected to the first circulation pool through a pipeline with a pump for delivering dilute acid to the first circulation pool. The circulating water supply structure includes a cooling tower and a circulation tank, etc. A cooling jacket is provided outside the second hydration tower, and the cooling jacket is connected to the circulating water supply structure through a pipeline to form a circulating cooling structure. The above structure is basically the same as the structure of the existing phosphoric acid hydration device, except that: the first hydration tower 1 in this embodiment is not provided with a water-cooling jacket, and an external water cooling mechanism is provided on its top, and a water receiving tank 4 is provided on its bottom, and a plurality of guide grooves 5 are provided outside and between the water receiving tank 4 and the external water cooling mechanism from bottom to top. The bottom of the guide groove 5 is provided with a soft guide cylinder 6 that cooperates with it. The soft guide cylinder 6 is arranged vertically, and its upper end is fixed to the bottom of the guide groove 5. It is sleeved outside the first hydration tower 1, and there is a gap between it and the first hydration tower 1. A disconnection seam is provided on it in the vertical direction. The disconnection seam ensures that the soft guide cylinder 6 can be flipped up to observe the scale. The guide groove 5 and the soft guide cylinder 6 are used to guide the water of the external water cooling mechanism to flow along the outer wall of the first hydration tower 1. The water receiving groove 4 is used to receive the water sprayed by the external water cooling mechanism. The external water cooling mechanism is arranged around the first hydration tower 1, and the water sprayed by it flows downward along the outer wall of the first hydration tower 1. It is an annular structure, and the water sprayed by it is evenly distributed. The water receiving groove 4 and the guide groove 5 are both conical grooves with a large top and a small bottom. There is an annular gap (width of 3-5mm) between the bottom of the guide groove 5 and the first hydration tower 1 to facilitate the downward passage of water. The bottom of the water receiving tank 4 is closed and connected to the water inlet of the circulating water supply structure through a pipeline, and the circulating water supply structure is connected to the water outlet of the external water cooling mechanism through a pipeline with a pump. Specifically, the water receiving tank 4 and the guide tank 5 in the embodiment of the utility model are both conical tanks coaxially arranged with the first hydration tower 1, and their tops are open; the bottom of the water receiving tank 4 is fixed on the first hydration tower 1, and the bottom of the guide tank 5 is located on the adjacent outer side of the first hydration tower 1. Among them, the first hydration tower 1 and the second hydration tower are higher than the circulating water supply structure.

[0022] Furthermore, the guide groove 5 in the embodiment of the utility model is fixed on the first hydration tower 1 or on a bracket next to the first hydration tower 1. Usually, the first hydration tower 1 is fixed on a multi-layer bracket, and each layer of the bracket is provided with a guide groove 5. Multiple tie rods 8 (multiple tie rods 8 are evenly distributed) are provided between the inner wall of the water receiving groove 4 and the guide groove 5 and the first hydration tower 1 to ensure stability, and the tie rods 8 are arranged obliquely outward from top to bottom.

[0023] Specifically, the soft guide tube 6 in the embodiment of the utility model is a canvas tube, which has a length of 0.5-1.5m and an inner diameter that is the same as the inner diameter of the bottom of the guide groove 5 , and is located above the adjacent lower guide groove 5 .

[0024] Among them, the external water cooling mechanism in the embodiment of the utility model includes at least one annular tube 2. If there are multiple annular tubes 2, the multiple annular tubes 2 are arranged side by side up and down. The annular tube 2 is coaxially arranged outside the first hydration tower 1, and is fixed to the first hydration tower 1 through a corresponding fixing rod. The inner wall thereof is evenly distributed with multiple spray holes, which are connected to the water outlet of the circulating water supply structure through a pipeline with a pump. Of course, a nozzle can also be arranged at the spray hole.

[0025] Further, see Figure 2 The external water cooling mechanism in the embodiment of the utility model also includes a splash shield bracket 7 on the first hydration tower and a splash shield 3 on the splash shield bracket 7. The splash shield 3 is used to prevent the water sprayed by the external water cooling mechanism from splashing. The splash shield 3 is a cone with a small top and a large bottom, and its bottom is open. Its upper end is fixed on the first hydration tower 1, and its lower part is overlapped on the splash shield bracket 7. It shields the annular tube 2, and its lower end is located outside the annular tube 2. It can be made of canvas. Among them, the splash shield bracket 7 is an annular frame coaxially arranged with the first hydration tower 1, which is fixed on the first hydration tower 1, and its diameter is larger than the diameter of the annular tube 2. It is located outside the annular tube 2.

[0026] Furthermore, a sampling port is provided at the top of the cooling jacket of the second hydration tower in the embodiment of the utility model (cooling water can be sampled. If the pH is less than a predetermined value, leakage of the second hydration tower may be suspected, but it has been verified that leakage of the second hydration tower is difficult), and the sampling port overflows to the circulating water supply structure and is connected to the water outlet of the circulating water supply structure through a pipeline. The bottom of the cooling jacket of the second hydration tower is connected to the water inlet of the circulating water supply structure through a pipeline.

[0027] Example 1

[0028] See also Figure 1-2 Embodiment 1 provides a phosphoric acid hydration device, and its structure is the same as the structure of the phosphoric acid hydration device disclosed in Embodiment 1, except that: the height of the first hydration tower 1 in this embodiment is 14m, and its diameter is 2m. The outer diameters of the water receiving trough 4 and the guide groove 5 are 3m, and the number of guide grooves 5 is 3. The distance between the bottom guide groove 5 and the water receiving trough 4 is 4m, the distance between two adjacent guide grooves 5 is 4m, and the width of the gap between the bottom of the guide groove 5 and the first hydration tower 1 is 5mm. The number of annular tubes 2 is two, and the inner diameter of the annular tube 2 is 2.1m. The diameter of the spray hole is 5mm, and the distance between two adjacent spray holes is 20mm. The length of the soft guide tube 6 is 1.0m.

[0029] The “first” and “second” in this embodiment are only used for distinction and have no other special meanings.

[0030] 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. A phosphoric acid hydration device, comprising a first hydration structure, a second hydration structure and a circulating water supply structure, wherein the first hydration structure comprises a first heat exchanger, a first hydration tower (1) and a first circulation pool connected end to end, the second hydration structure comprises a second heat exchanger, a second hydration tower and a second circulation pool connected end to end, the exhaust port of the first hydration tower (1) is connected to the air inlet of the second hydration tower through a pipeline, the second hydration tower is provided with a cooling jacket, and the cooling jacket is connected to the circulating water supply structure through a pipeline; characterized in that The first hydration tower (1) is not provided with a water cooling jacket, an external water cooling mechanism is provided on its external top, a water receiving trough (4) is provided on its external bottom, and a plurality of guide grooves (5) are provided on its external side and located between the water receiving trough (4) and the external water cooling mechanism in order from bottom to top; the external water cooling mechanism is arranged around the first hydration tower (1) and the water sprayed therefrom flows downward along the outer wall of the first hydration tower (1); the water receiving trough (4) and the guide groove (5) are both conical grooves with a larger top and a smaller bottom, an annular gap is provided between the bottom of the guide groove (5) and the first hydration tower (1), the bottom of the water receiving trough (4) is connected to a circulating water supply structure via a pipeline, and the circulating water supply structure is connected to the external water cooling mechanism via a pipeline with a pump.

2. The phosphoric acid hydration device according to claim 1, characterized in that: The water receiving groove (4) and the guide groove (5) are both conical grooves coaxially arranged on the first hydration tower (1), and the tops thereof are open; The bottom of the water receiving groove (4) is fixed on the first hydration tower (1), and the bottom of the guide groove (5) is located adjacent to the outer side of the first hydration tower (1).

3. The phosphoric acid hydration device according to claim 1, characterized in that: The guide groove (5) is fixed on the first hydration tower (1) or on a bracket next to the first hydration tower (1), and a pull rod (8) is provided between the inner walls of the water receiving groove (4) and the guide groove (5) and the first hydration tower (1), and the pull rod (8) is arranged obliquely outward from top to bottom.

4. The phosphoric acid hydration device according to claim 1, characterized in that: The bottom of the guide groove (5) is provided with a soft guide cylinder (6) matched therewith; the soft guide cylinder (6) is arranged vertically, and its upper end is fixed to the bottom of the guide groove (5), and is sleeved outside the first hydration tower (1), with a gap between it and the first hydration tower (1), and a disconnection seam is provided on it along the vertical direction.

5. The phosphoric acid hydration device according to claim 4, characterized in that: The soft guide tube (6) is a canvas tube, and its length is 0.5-1.5m.

6. The phosphoric acid hydration device according to claim 1, characterized in that: The external water cooling mechanism comprises at least one annular tube (2). If there are multiple annular tubes (2), the multiple annular tubes (2) are arranged side by side up and down; the annular tube (2) is coaxially arranged outside the first hydration tower (1), and multiple spray holes are evenly distributed on its inner wall. It is connected to the circulating water supply structure through a pipeline with a pump.

7. The phosphoric acid hydration device according to claim 1, characterized in that: The external water cooling mechanism also includes a splash shield bracket (7) on the first hydration tower and a splash shield (3) on the splash shield bracket (7); the splash shield (3) is in a conical shape with a small top and a large bottom, with an open bottom, an upper end fixed to the first hydration tower (1), and a lower part overlapped on the splash shield bracket (7), so as to shield the annular tube (2).

8. The phosphoric acid hydration device according to claim 7, characterized in that: The splash shield support (7) is an annular frame coaxially arranged with the first hydration tower (1), which is fixed on the first hydration tower (1) and is located outside and above the annular tube (2).

9. The phosphoric acid hydration device according to claim 1, characterized in that: A sampling port is provided on the top of the cooling jacket of the second hydration tower, and the sampling port overflows to the circulating water supply structure and is connected to the circulating water supply structure through a pipeline.

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