Technical renovation for counter-rotation prevention in coking rich gas compressors
Thread Content
The original one-two-one anti-surge system was modified to a two-stage anti-surge system; two anti-surge control valves were installed. The original one-two-one return valve was replaced by a two-two-return valve. A new anti-surge control valve was ordered to be used for stage 1 anti-surge control, located between the stage 1 outlet and the air cooler. Both anti-surge valves are installed on the compressor platform. The new main equipment and installations are as follows: file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image002.jpg Ø One check valve at the outlet of Stage 1 of the compressor. Ø One additional anti-surge valve, with a requirement that the time required to switch it from fully open to fully closed be within 2 seconds; the flow capacity of this valve must be determined using CCC criteria. Ø Three manual stop valves will be added, to serve as isolation valves before and after the anti-surge valve in Stage 1, as well as for use on the side lines. Ø For the piping diagrams related to the two anti-surge control valves, please refer to the piping diagrams for the rich gas compressors at Qingyang Petrochemical. Ø Associated pipelines and construction work. Ø One safety relay with 4-20mA output will be added for the additional anti-surge valve. Ø Installation of the additional anti-surge valve, along with cable installation and wiring
This post was last edited by sscomss on 2016-2-19 at 16:56. The compression volume for the first stage of the compressor results in an outlet pressure of 3.5 kilograms; the pressure in the distillation tower is 1 kilogram, with a compression volume of 2.5 kilograms, and the outlet pressure of the compressor is 10 kilograms. The compression volume for the second stage is 6.5 kilograms. In fact, what actually causes surge in the compressor are the flow rate and pressure changes in the second stage of the compressor. When the backflow occurs towards the distillation tower, it often wastes the pressure energy at the original outlet. If the backflow is directed towards the outlet of the first stage, it can be reduced, while the outlet pressure will increase accordingly; the rotational speed will decrease, thereby reducing the amount of medium-pressure steam required.
Can we take a look at the flowchart? I’ve never seen such a modification; thank you.
What is the purpose of the renovation? Advantages? Solve
Energy saving! ! ! After the renovation, it can save more than 10% in energy consumption compared to before the renovation. The reply on the 2nd floor is fundamentally very correct. For a coking plant with a capacity of 1.2 million tons per year, the savings in steam costs amount to around 3 million. The total investment is around 600,000.
Our rich gas compressors are driven by high-pressure motors; I was wondering if this method can be used?