System and process for acetylene concentration by cracking natural gas

The invention provides a system for acetylene concentration by cracking natural gas. The system comprises a pre-washing tower, a main washing tower, an acetylene stripping tower, a tail gas washing tower, a countercurrent desorption tower and a solvent treatment unit. The solvent treatment unit comprises a potassium carbonate adding device, a thermal desorption tower, a vacuum tower and a high-grade alkyne stripping tower; the pre-washing tower is separately connected with the main washing tower and the acetylene stripping tower; the main washing tower is connected with the tail gas washing tower and the countercurrent desorption tower; the countercurrent desorption tower outputs circulating gas and acetylene gas. The system for acetylene concentration by cracking the natural gas effectively reduces the corrosion problem in a system of a concentration device, alleviates the blockage of the system, ensures stable running of the device, reduces the consumption of an NMP solvent, prolongsthe cleaning and mainten