RU-2026108032-A - PART-LOAD CONTROL OF AN AMMONIA OR METHANOL SYNTHESIS CIRCUIT

Inventors

• ПАНЦА Серджо
• ПИН Маттиа
• КАРРАРА Давиде
• ДЖЕНОВА Джованни

Assignees

• КАСАЛЕ СА

Dates

Publication Date

20260507

Application Date

20240827

Priority Date

20230830

Claims (20)

1. 1. A method for controlling an ammonia synthesis circuit (101) or a methanol synthesis circuit operating at partial load, in which:
2. fresh make-up gas is fed into the synthesis circuit (13);
3. the full load mode of the synthesis circuit corresponds to the nominal amount of incoming fresh make-up gas, and in the partial load mode the amount of fresh make-up gas incoming into the circuit is less than the nominal amount;
4. The synthesis circuit includes:
5. converter (1) in which the reaction of the feed gas takes place;
6. a circulator (4), which is a compressor designed to maintain circulation in the synthesis circuit;
7. a first differential pressure regulator (DPR1) that responds to the pressure difference between the first measuring point located on the suction side of the circulator (4) and the second measuring point located on the pressure side of the circulator;
8. at least a first valve (5, 6) for controlling the circuit, which is configured to regulate the pressure in the circuit and/or the circulation flow rate in the circuit and which is controlled by the specified differential pressure regulator,
9. wherein the method for controlling the circuit at partial load includes the formation of a set value (ЗЗ1) for the first differential pressure regulator (ДРД1) so that the opening of the first valve (5, 6) for controlling the circuit is regulated in accordance with the specified set value.
10. 2. The method according to claim 1, in which the circuit control valve is the inlet valve (5) of the circulator (4), located on the suction side of said circulator.
11. 3. The method according to claim 1, wherein the circuit control valve is the feed valve (6) of the converter (1).
12. 4. The method according to any one of paragraphs 1-3, in which the circuit includes:
13. a heating stage (15) located downstream of the converter (1) and configured to preheat the feed gas pumped by the circulator (4) and directed into the converter (1);
14. a cooling-separation stage (2, 3) located downstream of the converter (1) and configured to process the converter exhaust stream to obtain a liquid product and unreacted gas sent to the circulator;
15. wherein the first measuring point of the first differential pressure regulator (DRD1) is located between the cooling-separation stage and the circulator, and the second measuring point is located between the circulator and the heating stage.
16. 5. The method according to any of the preceding claims, wherein the set value (SV1) is a fixed value or a variable value depending on the load of the circuit.
17. 6. The method according to any of the preceding claims, wherein the setpoint (ЗЗ1) of the first differential pressure regulator is determined as a function of the plant load or as a function of the make-up gas flow rate.
18. 7. The method according to any of the preceding paragraphs, in which the set value (ЗЗ1) is formed by another regulator located in series with the said differential pressure regulator.
19. 8. The method according to claim 7, wherein the other regulator is a pressure regulator responsive to the pressure at a selected point in the circuit, preferably to the pressure in the feed line (12) of the converter.
20. 9. The method according to any of the preceding paragraphs, in which the circuit, in addition to the mentioned first circuit control valve, includes a second circuit control valve controlled by a second differential pressure regulator (DPR2), and when implementing the method, a set value (SV2) is generated for this second differential pressure regulator.