The plate heat exchanger is a highly efficient compact heat exchanger. Because of its high heat transfer coefficient, small pressure loss, compact structure, convenient maintenance, and with the improvement of structure and the improvement of large-scale manufacturing, it has been more and more widely used.In addition to high temperature, high pressure and special media conditions, the use of plate heat exchangers instead of shell and tube heat exchangers can achieve significant results.However, the general bulk type plate heat exchanger (detachable plate heat exchanger) has a pressure of not more than 215 MPa due to the limitations of its structure, the use temperature does not exceed 250e, and there is also compatibility between the fluid and the gasket. The plate-and-shell heat exchanger combines the advantages of a plate heat exchanger and a shell-and-tube heat exchanger. The plate heat exchanger has the advantages of compact structure and high heat transfer coefficient, and retains the advantages that the shell-and-tube heat exchanger can operate under high temperature and high pressure. Therefore, plate-and-shell heat exchangers have broad application prospects in the fields of power, petroleum, chemical, metallurgy, refrigeration, HVAC and environmental protection.