Pulp cooking refers to a pulping process in which papermaking raw materials and cooking liquor are put into a digester and then heated by steam to remove the non-cellulose part of the fibrous material. The black liquor boiled in papermaking has high calorific value and good flammability, and is an important self-generating energy source in the papermaking industry. Prepler's heat exchanger products can be used as a series of key energy-saving equipment in the black liquor concentration process, and are an important measure to improve energy utilization and environmental protection in paper mills.
Heat exchangers are an important part of pulp and paper mills. With the help of heat exchangers, paper mills have benefited a lot in terms of energy saving or environmental protection.
There are many processes in paper mills that can use heat exchangers, especially plate heat exchangers, which occupy a small space, have high heat recovery efficiency, easy maintenance, and low cost.
Maybe many users have a need for heat exchangers, but they don't know that there is this equipment. In fact, in the final analysis, the role of the heat exchanger is nothing more than these points: heating, preheating, cooling, and condensation. As long as there are needs in these aspects, heat exchangers can be used. As for whether to use a plate heat exchanger or a tube heat exchanger, you can consult our Kang Jinghui heat exchanger manufacturer, and we will choose your suitable heat exchanger model according to your working conditions. Today, I will tell you about the application principle of the plate heat exchanger for the application in the paper industry: Cooking is the process of pulping paper making raw materials and cooking liquid into the digester, and steam heating to remove the non-inflammation in the fiber raw materials. Cellulose part. An energy consumption process of the cooking process. At the end of the cooking, recovering the large amount of low-grade heat generated by the slurry sprayed by the digester for use is a process of comprehensive utilization of energy and resources.
The slurry discharged from the bottom of the cooking pot is sprayed into the upper part of the flat-bottom spray pot. Because of its dramatic drop in pressure. The water in the slurry flashes to generate dirty steam. The dirty steam overflows from the top of the spray pot and enters the propeller separator. In the hydrocyclone, the slurry and other impurities carried by the steam are separated, and returned to the flat-bottom spray pot through the return pipe at the bottom of the separator. The steam from the top of the separation head enters the jet condenser 3. At the same time, the steam and hot air discharged from the steam release during the cooking process enter the jet condenser.
In the jet condenser, 30-40°C polluted hot water pressurized by the polluted hot water jet pump is sprayed from the top of the jet condenser. After direct heat exchange with the sewage steam, it becomes sewage hot water at 90℃ and enters the sewage hot water tank. After the sewage hot water overflows from the upper part of the sewage hot water tank, the residual slurry and other magazines in the sewage hot water are removed by the sewage hot water filter. It flows through the intermediate tank. Then the sewage hot water pump is used to send the sewage hot water to the plate heat exchanger to exchange heat with the cold water. After the heat exchange, the temperature of the sewage and hot water drops to 35°C and returns to the cooling water used as the jet condenser. The cold water from the washing section has a water temperature of about 25°C, and most of it enters the plate heat exchanger and exchanges heat with the sewage and hot water, except for part of the cooling water used as the jet condenser. After the temperature rises to 70°C, it is put into a hot water tank, and this hot water is finally sent to the washing section by a hot water pump for pulp washing. The application of plate heat exchangers in the paper industry is not limited to this, as long as it is used for heating, preheating, cooling, and condensation between vapor-liquid and liquid-liquid, plate heat exchangers can be used.
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