The plate heat exchanger is a new type of energy-efficient heat transfer equipment, heat transfer efficiency (2-4 times higher than conventional shell and tube heat exchanger), favor the use of low temperature heat source, easy to change the combination of heat transfer area or process, compact structure, deal with large, easy operation, cleaning, disassembly, and easy maintenance, small footprint, easy maintenance, resistance loss, heat loss, a small amount of cooling water, lower investment.