Application of condensate recovery in flexible packaging industry
A packaging company is mainly engaged in the production and sales of packaging materials and related technical consulting services: such as food packaging, cooking bag packaging, chemical soft packaging, desiccant deoxidizer packaging, aluminum thin composite packaging, high temperature sterilization bags, high and low temperature mylar (medical device packaging), boiled bags, etc. All the equipment of the company is imported from Italy and Japan. It is a first-class production enterprise in the domestic printing industry.
The company's main steam equipment is a variety of gravure printing presses, each machine has a number of hot air heat exchangers, steam out of the boiler through the pressure reducing valve to 4bar, and then through the control valve into the hot air heat exchanger heating The air reaches a certain temperature (the setting of the temperature is related to the ink), and the hot air blown out is used to dry the ink.
The project considered the recovery of condensate in the design but did not consider the use of condensate recovery equipment. The company’s leaders and technicians are also aware of the social benefits of condensate recovery and the economic benefits of the company. Because high-temperature condensate discharge will cause environmental pollution, and condensate water contains considerable heat, direct emissions will cause waste of energy. Calculated on the basis of natural gas, approximately 15-17 RMB can be saved per ton of condensate. For many companies, the payback period for condensed water will be less than one year.
The specific method used to recycle condensate is based on the specific conditions of the company. Generally, there is no improvement in the condensing water piping arrangement, and the boiler room is in the lowest position of the entire plant area. Self-flow can be used. It is only necessary to pay attention to the selection of the condensate line according to the amount of secondary steam. In the case of the company, the steam pipelines and condensate pipelines are arranged overhead, the height is 4.5M, and the condensate outlet of the hot air heat exchanger is about 2M. At the same time, the condensed water pipelines are returned to the boiler house after they have walked on the roof.
Suzhou Rick Valves is a professional company in the field of global steam applications. The engineers and technicians of the company invited us to discuss the problem of condensate recovery. We believe that because the steam enters the heat exchanger through the control valve, the control valve is under the control of the temperature controller. It can be at any degree of opening, so in the case of a small opening of the control valve, the condensate cannot reach the height of the steam pipe, that is, the condensate may lose flow under this condition. The occurrence of loss of flow will cause temperature control fluctuations and water hammer. We recommend Rick's PT Series Condensate Recovery Pumps, which are installed on each press. The condensate from each press is returned to the condensate recovery pump. After being pressurized by the condensate recovery pump, it is returned to the boiler room. . Rick's condensate recovery pump is powered by steam, which avoids the problem of easy cavitation of the electric pump at high temperatures, and the performance is stable and reliable. In the first phase of the project, three PT series condensate recovery pumps from our company were used and are currently operating well. Other products used by the company's Suzhou Rick Valves include Rick's decompression regulators and steam control valves.