Heat exchanger

摘要

A sludge heat treat system wherein a tube in the tube heat exchanger consists of multiple set of small tubes spaced inside of larger tubes. At the end of each run there is a return bend that conveys the fluid on the inner tube around to the next tube in the tube exchanger and also conveys the outer tube fluid to the next tube system. The inner tube system is carrying sludges that are obtained in a sewage treatment plant or an industrial waste treatment plant or any other type of treatment plant where sludges are produced and it is desired to heat treat these in order to release the bound waters and thereby effect a dewatering of the sludge cake which is not possible without sludge heat treat systems. The outer tube conveys a liquid which is usually water which has been treated. The outer tube conveys a liquid which is usually treated water which gives up the heat from an outside source to the sludge on the inner tube in a consistent manner. The inner tube takes the heat from the sludge and transfers it to the water to preheat the water. The return bend is designed so that the sludge on the inner tube is conveyed through the outside portion of the return bend and the water from the outer tube is channeled through a channel on the inner side of the return bend. Built into the return bend is a heating surface where there can continue to be a transfer of heat between the water and sludge within the return bend.