RU-2026113080-A - Sieve plate for an absorber

Inventors

• РОСЛЕР, Рональд
• ЯЗГАН-БИРГИ, Пелин
• БУЖАЛЬСКИ, Якуб

Assignees

• ЯРА ИНТЕРНЭШНЛ AСA

Dates

Publication Date

20260505

Application Date

20240927

Priority Date

20230929

Claims (20)

1. 1. A round sieve plate (1) for an absorber, which is a perforated plate having through holes (7), while the round sieve plate (1) contains
2. a descending drain (3), wherein the descending drain (3) is a segment of the through hole of the round sieve plate (1), limited by the chord and the corresponding arc of the round sieve plate (1);
3. an overflow partition (4) located on the chord of the descending drain (3) to maintain a set liquid level on the upper surface of the round sieve plate (1) during operation;
4. a zone (5) of stabilization at the outlet, in which there are no through holes (7), wherein the zone (5) of stabilization at the outlet is limited by the chord of the descending runoff (3) and a second chord (6), parallel with respect to the chord of the descending runoff (3), wherein the difference between the angle formed in the center of the circular sieve plate (1) by the second chord (6), and the angle formed in the center of the circular sieve plate (1) by the chord of the descending runoff (3) is in the range between 0.50° and 10.0°;
5. an inlet stabilization zone (8) in which there are no through holes (7), wherein the inlet stabilization zone (8) is a segment of a circular sieve plate (1) limited by a chord and a corresponding arc of the circular sieve plate (1), wherein the inlet stabilization zone (8) has the same surface area as the downstream drain (3) and is located diametrically opposite to the downstream drain (3); and
6. a hatch (9) closed by a cover having through holes (7),
7. wherein the distance between the centroid of the hatch (9) and the perpendicular projection of said centroid onto the diameter (15) of the sieve plate (1), perpendicular to the diameter (14) dividing the downward drain (3) in half, is less than 20% of the radius of the circular sieve plate (1);
8. the distance from the center of the circular sieve plate (1) to the centroid of the hatch (9) is at least 80% of the radius of the sieve plate (1);
9. wherein the round sieve plate (1) further comprises one or more cooling coils (12) located above the region of the round sieve plate (1) containing through holes (7),
10. wherein the stabilization zone (5) at the outlet is designed with the possibility of releasing gas contained in the aqueous solution from the aqueous solution up to the overflow partition (4),
11. The hatch is located at an angle of 90° in relation to the downflow.
12. 2. A circular sieve plate (1) according to claim 1, in which the difference between the angle formed in the centre of the circular sieve plate (1) by the second chord (6) and the angle formed in the centre of the circular sieve plate (1) by the chord of the descending drain (3) is in the range between 0.50° to 5.0°.
13. 3. A circular sieve plate (1) according to claim 1 or 2, in which the overflow partition (4) has a height in the range between 10.0 and 100.0 mm.
14. 4. A circular sieve plate (1) according to any one of claims 1 to 3, in which the angle formed in the centre of the circular sieve plate (1) by the chord of the descending drain (3) is in the range between 50.0° and 70.0°.
15. 5. A round sieve plate (1) according to any one of paragraphs 1-4, in which the hatch (9) has a round or rectangular shape.
16. 6. A circular sieve plate (1) according to any one of claims 1 to 5, wherein the through holes (7) are circular and the diameter of the through holes (7) is in the range between 2.0 and 13.0 mm.
17. 7. A round sieve plate (1) according to any one of claims 1-6, further comprising a plurality of partitions (13) to increase the residence time of the aqueous solution on the round sieve plate (1).
18. 8. An absorption column for the production of nitric acid, containing one or more round sieve trays according to any one of paragraphs. 1-7.
19. 9. A method for producing nitric acid, comprising the following stages:
20. a) directing a gas stream containing nitrogen dioxide to the bottom of the absorption column according to paragraph 8;