What is the Specs and Standard Instrumentation of Bituminous Coal Boiler?

Buyers specifying the SZL25-2.5-AⅡ coal-fired steam boiler frequently need the electrical and instrumentation data for site preparation, panel design, and regulatory submission. This article outlines the product specifications and identifies where model-specific parameters require direct confirmation from ZOZEN's engineering team.

About the SZL25-2.5-AⅡ boiler

The SZL series is ZOZEN's double-drum longitudinal-axis coal-fired steam boiler. The SZL25-2.5-AⅡ designates:

Rated evaporation: 25 t/h
Working pressure: 2.5 MPa
Fuel grade: AⅡ bituminous coal
Thermal efficiency: above 81%
Fan motor specifications

The SZL25-2.5-AⅡ is equipped with an induced draft (ID) fan and a forced draft (FD) fan. Exact motor power ratings (kW), voltage, and frequency specifications for this model are provided in the boiler's technical documentation package, which is issued after order confirmation or upon formal technical inquiry. Buyers preparing electrical panel layouts or motor control centre (MCC) designs should request this document directly from ZOZEN's engineering department.

Stoker (chain grate) motor specifications

The SZL series uses a chain grate stoker. The grate drive motor specifications, including power rating and variable speed control range, are model-specific parameters included in the engineering documentation package. These are not published in standard product data sheets and require a direct technical inquiry.

Feed water pump motor specifications

Feed water pump selection is determined by the boiler's rated evaporation, working pressure, and feed water temperature. For the SZL25-2.5-AⅡ, the pump motor specifications are confirmed during engineering design and are included in the technical documentation package. Buyers should request the full electrical load list from ZOZEN's technical department.

Standard instrumentation and safety devices

Based on ZOZEN's standard configuration for the SZL series, the following instrumentation is included:

Water level controllers with high and low water level alarms and automatic shutdown
Steam pressure gauge and pressure transmitter
Safety valves set to the working pressure limit per design standard
Flue gas temperature monitoring
Automatic blowdown control
For a complete instrumentation list, P&ID diagram, and electrical load schedule specific to the SZL25-2.5-AⅡ, submit a formal technical inquiry to ZOZEN's engineering team at info@zozen.com.