Stainless steel acid distributor for preparing concentrated sulfuric acid

Abstract

The stainless steel acid distributor comprises an acid inlet barrel, an acid distribution assembly and an acid inlet pipe, the acid inlet barrel extends in the vertical direction and is fixed to a tower barrel of a dry absorption tower, the acid distribution assembly is rotationally hung at the lower end of a fixed barrel, an acid inlet is formed in the acid inlet barrel, and the acid inlet pipe is communicated with the acid inlet barrel through the acid inlet; the acid distribution assembly comprises a main pipe rotationally mounted on the acid inlet pipe and a branch pipe fixed on the main pipe, and spraying holes are formed in the branch pipe; blades are installed in the main pipe, sulfuric acid can enter the acid inlet barrel through the acid inlet pipe, and under pushing of the sulfuric acid, the blades can drive the acid distribution assembly to rotate. The sulfuric acid entering the acid inlet barrel pushes the acid distribution assembly to rotate through the blades, so that the sulfuric acid sprayed out of the branch pipes can spray the whole end face of the filler area, the distribution uniformity of the sulfuric acid is improved, the height of the filler area tends to the designed height, the tower resistance is reduced, and the conveying cost of gas is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a stainless steel acid distributor for concentrated sulfuric acid production. BACKGROUND

[0002] The acid distributor is used in the dry absorption tower in the concentrated sulfuric acid production equipment, and is used for spraying sulfuric acid into the dry absorption tower to absorb SO3 gas and produce concentrated sulfuric acid. The acid distribution effect of the acid distributor directly affects the effective wetting area of the filler and the mass transfer efficiency. Uniform acid distribution is an important prerequisite for the dry absorption tower to achieve the expected drying and absorption efficiency. The existing acid distributors mainly have groove type and pipe type, which respectively use acid grooves or acid pipes to spray and distribute sulfuric acid. Both of them adopt fixed structures. Therefore, after the acid liquid reaches the filler area, it needs to flow downward for a distance before achieving uniform distribution, which reduces the utilization rate of the filler area and reduces the absorption effect of SO3. To ensure the absorption effect of SO3, the height of the filler area is usually increased by 5-15% compared with the design value to offset the uneven distribution at the top of the filler area. However, this also leads to an increase in tower drop, resulting in an increase in the power cost of SO3 gas transportation. Therefore, it is necessary to improve the uniformity of acid distribution at the top of the filler area to fully utilize the filler, thereby reducing the actual height of the filler area and the power cost of SO3 gas transportation. SUMMARY

[0003] To solve the problem of low utilization rate of the filler area at the top, which leads to an actual height of the filler area greater than the design height, and thus increases the tower drop and power cost, the present application proposes a stainless steel acid distributor for concentrated sulfuric acid production, which includes an acid inlet cylinder, an acid distribution assembly, and an acid inlet pipe. The acid inlet cylinder extends in the vertical direction and is fixed to the tower cylinder of the dry absorption tower. The acid distribution assembly is rotatably hung at the lower end of the fixed cylinder. An acid inlet opening is provided on the acid inlet cylinder, and the acid inlet pipe is connected to the acid inlet cylinder through the acid inlet opening. The acid distribution assembly includes a main pipe and a branch pipe. The main pipe extends in the vertical direction, and the upper end of the main pipe is rotatably installed on the acid inlet pipe. The branch pipe extends in the horizontal direction and is fixed to the lower end of the branch pipe. The main pipe is connected to the branch pipe, and the branch pipe is provided with a downward spraying hole.

[0004] A blade is installed in the main pipe. The blade extends upward out of the main pipe and into the acid inlet cylinder. Under the push of the sulfuric acid, the blade can drive the acid distribution assembly to rotate.

[0005] In the application, when the sulfuric acid enters into the acid inlet cylinder through the acid inlet pipe, a pushing force is generated on the blade, thereby driving the whole acid distribution assembly to rotate, the sulfuric acid is sprayed downward through the spray holes on the branch pipe and dripped onto the packing zone in the dry absorption tower, due to the rotation of the acid distribution assembly, the sulfuric acid can spray the whole end surface of the packing zone, thereby improving the uniformity of the distribution of the sulfuric acid on the top of the packing zone, and the height of the packing zone can be reduced, so that the height of the packing zone tends to the design height.

[0006] Further, the lower end of the acid inlet pipe is fixed with an annular support plate which extends inward in the radial direction, and a support flange is fixed on the top of the main pipe and rotatably supported on the annular support plate.

[0007] Further, in order to reduce the friction between the support flange and the annular support plate, the support flange is supported on the annular support plate through a plane thrust bearing.

[0008] Further, in order to improve the force of the sulfuric acid on the blade, the blade is a spiral blade, and a plurality of spiral blades are fixed on the inner circumferential surface of the acid inlet cylinder in the circumferential direction.

[0009] Further, the acid inlet pipe is installed on the acid inlet cylinder in the tangential direction. This design can make the sulfuric acid entering into the acid inlet cylinder in a spiral flow state, so as to generate the largest possible pushing force on the blade.

[0010] Further, in order to fully utilize the pushing force of the sulfuric acid, the blade exceeds the top of the acid inlet opening upward.

[0011] Further, a top cover is detachably and sealingly installed on the top of the acid inlet cylinder, and the top cover seals the top of the acid inlet cylinder. This design can prevent the sulfuric acid from overflowing from the top of the acid inlet cylinder, which can cause uneven distribution of the sulfuric acid and thus reduce the pushing force of the sulfuric acid on the blade. When part of the sulfuric acid overflows from the top of the acid inlet cylinder, it not only causes uneven distribution of the sulfuric acid, but also reduces the pushing force of the sulfuric acid on the blade, making it difficult for the acid distribution assembly to rotate. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a structural schematic view of an embodiment of the utility model.

[0013] Figure 2 is Figure 1 A-A view in DETAILED DESCRIPTION

[0014] Referring to Figure 1 and Figure 2The application discloses a stainless steel acid distributor for concentrated sulfuric acid production, which comprises an acid inlet cylinder 21, an acid distribution assembly 30 and an acid inlet pipe 28. The acid inlet cylinder 21 extends in the vertical direction, and a triangular supporting block 29 is welded on the outer wall of the acid inlet cylinder. A supporting piece 12 is welded on the inner wall of a tower cylinder 11 of a dry absorption tower, and the triangular supporting block 29 is fixed on the supporting piece, so that the acid inlet cylinder is fixed on the tower cylinder. An acid inlet opening 27 is formed on the cylinder wall of the acid inlet cylinder, and the acid inlet pipe 28 extends into the dry absorption tower from the inside to the outside of the tower cylinder. The acid inlet pipe is welded on the edge of the acid inlet opening at the end of the acid inlet pipe extending into the dry absorption tower, so that the acid inlet pipe is communicated with the acid inlet cylinder through the acid inlet opening. In the embodiment, the acid inlet pipe is installed on the acid inlet cylinder in the tangential direction, so that the sulfuric acid entering the acid inlet cylinder through the acid inlet pipe is in the form of spiral flow. A top cover 23 is detachably installed on the top flange 22 of the acid inlet cylinder, and an acid-resistant fluorine rubber ring is installed between the top cover and the top flange. The top cover seals the top of the acid inlet cylinder.

[0015] The acid distribution assembly 30 comprises a main pipe 31 and four branch pipes 32. The main pipe 31 extends in the vertical direction, and a supporting flange 35 is welded on the top of the main pipe. An annular supporting plate 24 is welded on the lower end of the acid inlet pipe, and the annular supporting plate extends in the radial direction. The supporting flange is rotatably supported on the annular supporting plate through a plane thrust bearing 26, so that the upper end of the main pipe is rotatably installed on the acid inlet pipe, and the acid distribution assembly 30 is rotatably hung on the lower end of the fixed cylinder.

[0016] In order to facilitate the fixation of the plane thrust bearing 26, an annular groove 25 is formed on the upper side of the annular supporting plate 24 and is recessed downward. The lower ring of the plane thrust bearing 26 is clamped in the annular groove, and a screw 36 is screwed on the upper ring of the plane thrust bearing 26 through the supporting flange.

[0017] Each branch pipe extends in the horizontal direction, and one end of the branch pipe is welded on the lower end of the main pipe and is communicated with the main pipe. The other end of the branch pipe extends in the horizontal direction and is away from the main pipe, so that the branch pipes are arranged in the form of radiation. The branch pipes are uniformly and circumferentially arranged. A spraying hole 33 is formed on the branch pipe and faces downward. In order to avoid the downward bending of the end of the branch pipe away from the main pipe, a pull rod 37 is installed on the branch pipe and the main pipe.

[0018] A plurality of spiral blades 34 are installed in the main pipe. Each spiral blade extends upwards out of the main pipe and into the acid inlet cylinder. Each spiral blade is welded on the inner circumferential surface of the acid inlet cylinder in the circumferential direction. The top of the spiral blade exceeds the top of the acid inlet opening. The sulfuric acid can enter the acid inlet cylinder through the acid inlet pipe. Under the pushing of the sulfuric acid, the blade can drive the acid distribution assembly to rotate.

[0019] When the stainless steel acid distributor in the embodiment works, sulfuric acid can enter into the acid inlet cylinder along the tangent through the acid inlet pipe, the sulfuric acid in the acid inlet pipe is in a spiral flow state and pushes the spiral blades, under the pushing of the sulfuric acid, the acid distribution assembly rotates, so that the sulfuric acid flowing out of the branch pipe can be uniformly sprayed onto the packing zone, thereby the uniformity of the distribution of the sulfuric acid on the top of the packing zone can be improved, the utilization rate of the packing zone is improved, the actual height of the packing zone can be reduced, which is closer to the design height, the conveying power of the SO3 gas is reduced, and the power cost is reduced.

Claims

1. A stainless steel acid distributor for concentrated sulfuric acid acidification, characterized by, The acid feeding cylinder extends in vertical direction and is fixed on the tower cylinder of the dry absorption tower, the acid distributing assembly is rotatably hung on the lower end of the fixed cylinder, the acid feeding port is arranged on the acid feeding cylinder, the acid feeding pipe is communicated with the acid feeding cylinder through the acid feeding port; the acid distributing assembly comprises a main pipe and a branch pipe, the main pipe extends in vertical direction, the upper end of the main pipe is rotatably installed on the acid feeding pipe, the branch pipe extends in horizontal direction and is fixed on the lower end of the main pipe, the main pipe is communicated with the branch pipe, the spray hole is arranged on the branch pipe and faces downward; The vane is installed in the main pipe, the vane extends upwardly out of the main pipe and then extends into the acid feeding cylinder, the sulfuric acid can enter into the acid feeding cylinder through the acid feeding pipe, under the pushing of the sulfuric acid, the vane can drive the acid distributing assembly to rotate.

2. The stainless steel acid distributor for concentrated sulfuric acid production according to claim 1, characterized in that, The annular support plate is fixed on the lower end of the acid feeding pipe and extends inwardly in radial direction, the support flange is fixed on the top of the main pipe and is rotatably supported on the annular support plate.

3. The stainless steel acid distributor for concentrated sulfuric acid production according to claim 2, characterized in that, The support flange is supported on the annular support plate through the plane thrust bearing.

4. The stainless steel acid distributor for concentrated sulfuric acid production according to claim 1, characterized in that, The vane is a spiral vane, a plurality of spiral vanes are arranged and fixed on the inner circumferential surface of the acid feeding cylinder in circumferential direction.

5. The stainless steel acid distributor for concentrated sulfuric acid production according to claim 1, characterized in that, The acid feeding pipe is installed on the acid feeding cylinder in tangential direction.

6. The stainless steel acid distributor for concentrated sulfuric acid production according to claim 1, characterized in that, The vane exceeds the top of the acid feeding port upwardly.

7. The stainless steel acid distributor for concentrated sulfuric acid production according to claim 1, characterized in that, The top cover is detachably and sealingly installed on the top of the acid feeding cylinder, the top cover closes the top of the acid feeding cylinder.

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