Construction and installation of a pellet heating boiler house with a capacity of 0.9MW

The original task of the customer was to replace the existing wood chip stove with a more powerful pellet boiler – to design and build a fully automatic wood pellet boiler house with a fuel bunker. A biofuel boiler with a heat capacity of 0.9 MW was designed in the boiler house. The existing 0.9 MW gas boiler with the existing burner remained the reserve boiler. The type of biofuel used is wood pellets, and the reserve fuel is natural gas. The content of the work was to design an automatic biofuel boiler house that works without the constant presence of a person (unmanned).

A fully automatic pellet burner with a reserve heating boiler is intended for heat supply. The boiler house has an existing automatic reserve boiler activation system, which consists of a motorized rotary valve located on the return pipe of both boilers, a temperature sensor on the supply pipe of the pellet boiler, and a two-stage temperature regulator. In a normal situation, the pellet stove works, and the gas boiler’s rotary valve is closed. When the heating water temperature of the pellet boiler drops to the first stage, the rotary valve of the gas boiler is opened, and the boiler starts. When the temperature of the heating water of the pellet boiler drops to the second level (probable cause of the failure of the pellet boiler), the rotary valve of the pellet boiler is closed, and only the gas boiler remains in operation. When the heating water temperature of the pellet boiler rises to the corresponding level, the rotary valve of the pellet boiler is opened, and the gas boiler is stopped. The boiler house works unmanned, and all work is automatic according to the boiler house’s capacity change.