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Potassium sulfate is the main chlorine-free potash fertilizer in agriculture. Mannheim method is a method for preparing potassium sulfate from potassium chloride and sulfuric acid. at present, the production process is the most mature. The method has the advantages of high grade of potassium sulfate ( w ( K2O ) 50 % ~ 51 % ), little loss and high yield of potassium. So the potassium sulfate reaction furnace is also called mannheim furnace. 

Potassium sulfate reaction furnace heat preservation mannheim furnace heat preservation: the furnace consists of a combustion chamber ( heating chamber ), a reaction chamber, a flue, a stirring harrow, a burner ( two ), a feeder, a discharge port and the like. The reaction chamber of the potassium sulfate furnace is below the combustion chamber, the flue is below the reaction chamber, the heat generated by the combustion chamber radiates to the materials in the reaction chamber, and the waste heat of the flue is fully absorbed by the reaction materials.　

The reaction temperature of that potassium sulfate reaction furnace is control at about 550 deg C.
The temperature of that middle part of the reaction cham of the potassium sulfate reaction furnace is 550 - 600 deg c;  
Top temperature of potassium sulfate reactor: ≤ 920 ℃
Potassium sulfate reaction furnace bottom temperature: ≤ 650 ℃
Inlet pressure of combustion chamber of potassium sulfate reactor: micro negative pressure
Potassium sulfate reactor chamber pressure: micro negative pressure
Heat preservation structure of potassium sulfate reaction furnace

Solution of high temperature heat insulation of hot ceramics - heat insulation of potassium sulfate reactor ( mannheim furnace );
Ceramic fiber lining structure of potassium sulfate reaction furnace ( mannheim furnace ): 1400 type zirconium-containing ceramic fiber module + 30 mm 1400 type high aluminum ceramic fiber blanket.
Potassium sulfate reaction furnace ( mannheim furnace ) ceramic fiber lining insulation thickness: 300 mm
Considering that there is a certain amount of flue gas erosion between the potassium sulfate reaction kettle and the shell, there will be some corrosion to the potassium sulfate reaction kettle. The surface of the ceramic fiber module is coated with curing agent twice, so that the ceramic fiber module can resist corrosion and high wind speed.
Technical advantage
Thermal ceramic refractory fiber lining or construction technology advantages:
Professional construction: this type of furnace construction conditions are quite harsh, the construction team requirements are very high. Stone high temperature domestic exclusive potassium sulfate reaction furnace ceramic fiber lining design and construction, has more than 20 times of mannheim furnace energy-saving transformation lining construction, has experienced construction team, according to the experience in the construction combined with furnace type special parts, give perfect construction mode, and constantly give improvement scheme.  

The ceramic fiber modules are arranged in a soldier - column mode: along the compression dimension direction of the ceramic fiber modules. A layer of ceramic fiber blanket with the thickness of 20 mm is folded in half and compressed between the ceramic fiber module columns, and the ceramic fiber blanket is inserted and fixed on the ceramic fiber module with a spacing of 500 - 700 mm by a u - shaped nail so as to compensate the shrinkage possibly generated by the non-expansion surface of the fiber. When installing the backing layer at the top part of the furnace, the quick card matching module is used for temporary fixing by bolts.