The Flooring Expert

With the development of our society, we advocate clean energy, so the demand for natural gas as a clean energy is also increasing. However, in the process of natural gas exploitation, many gas wells often contain hydrogen sulfide, which will cause corrosion of equipment and pipelines, pollute the environment and endanger human health. With the development of science and technology, The wide use of natural gas desulfurization technology has solved these problems, but at the same time, the cost of natural gas purification and treatment has increased accordingly.

Molecular sieve desulphurization (also called desulfurization) skid, also called molecular sieve sweeting skid, is a key device in natural gas purifying or natural gas conditioning project.

Molecular sieve is an alkali metal aluminosilicate crystal with skeleton structure and uniform microporous structure. It is an adsorbent with excellent performance, high adsorption capacity and adsorption selectivity. Firstly, there are many channels with uniform pore size and neatly arranged holes in the molecular sieve structure, which not only provides a very large surface area, but also limits the entry of molecules larger than holes; Secondly, the surface of molecular sieve has high polarity due to the characteristics of ionic lattice, so it has high adsorption capacity for unsaturated molecules, polar molecules and polarizable molecules. Water and hydrogen sulfide are polar molecules, and the molecular diameter is smaller than the pore diameter of molecular sieve. When the raw gas containing trace water passes through the molecular sieve bed at room temperature, trace water and hydrogen sulfide are absorbed, Thus, the content of water and hydrogen sulfide in feed gas is reduced, and the purpose of dehydration and desulfurization is realized. The adsorption process of molecular sieve includes capillary condensation and physical adsorption caused by van der Waals force .According to Kelvin equation, capillary condensation decreases with the increase of temperature, while physical adsorption is an exothermic process, and its adsorption decreases with the increase of temperature and increases with the increase of pressure; Therefore, the adsorption process of molecular sieve is usually carried out at low temperature and high pressure, while the analytical regeneration is carried out at high temperature and reduced pressure. Under the action of high temperature, clean and low pressure regeneration gas, the molecular sieve adsorbent releases the adsorbate in the micropore into the regeneration gas flow until the amount of adsorbate in the adsorbent reaches a very low level. It also has the ability to adsorb water and hydrogen sulfide from the feed gas, realizing the regeneration and recycling process of the sieve.

Main configuration list of desulfurization unit

Table  configuration list of molecular sieve desulfurization unit

The main equipment is described as follows.

Note: 1. The list of main process equipment complies with the PID scheme

2. The list of spare parts for commissioning and 2-year operation will be provided in another document.

3. The external interface standard of the device is the butt flange of gost, and gaskets and fasteners are provided at the boundary of storage tank and equipment;

4.The technical data of the equipment described in this Annex shall be subject to the final design.