How to Choose a Coal Fired Steam Boiler for Your Process

Start with the steam requirement

Capacity is the first sizing check. A small process line may need a 1 t/h unit, while a larger industrial steam network may require a higher-capacity model. The product range includes models such as DZL1, DZL2, DZL4, DZL6, DZL8, DZL10, DZL12, DZL15, DZL20, DZL40, DZL65, and DZL80, with the rated steam capacity and pressure identified in each model designation and table entry.

Working pressure must be selected alongside capacity. Available rated working pressures include 0.7, 1.0, 1.25, and 1.6 MPa in the listed models, while the stated product range reaches 2.5 MPa. Rated steam temperature varies by model, including 170.41°C, 184.07°C, 193.3°C, and 204.31°C in the listed configurations.

Picture the boiler feeding a production process through a steam distribution line. The buyer should calculate the normal steam load, peak demand, required pressure at the process connection, and any pressure loss through the piping before requesting a final configuration.

Match the boiler to the coal supply

This coal-fired steam boiler supports lignite, bituminous coal, anthracite, and gangue. The fuel available at the plant should therefore be identified before the grate and combustion arrangement are selected. Fuel storage, feeding equipment, ash removal, and the flue route should be planned around the coal type and the expected operating schedule.

Three grate arrangements are available: chain grate, reciprocating grate, and hand burning. The right choice depends on how the plant handles fuel and how much manual intervention its operating routine can accommodate. Include the fuel type, expected consumption pattern, and preferred feeding method in the supplier's technical inquiry.

Check the heat-transfer and flue-gas layout

The boiler uses a single-bottle structure, threaded flue pipes, and water-cooled wall tubes on the left and right sides of the furnace. Front and rear arches are included in the furnace design. Coal is burned in the furnace chamber, and heat passes through the flue system and water-cooled surfaces to heat the boiler water and produce steam.

The large furnace chamber and rear dust separation room are relevant to the plant layout. Before ordering, measure the available boiler-room area and confirm the positions of the fuel feed, ash discharge, flue connection, dust-handling equipment, and maintenance access points.

Review the operating figures by model

The listed models show thermal efficiency from 85.8% to 88.9%, with exhaust gas temperatures from 120°C to 137°C. Feedwater temperatures in the model table range from 20°C to 105°C. These figures help buyers compare the configuration against the planned feedwater system and flue design.

For example, a DZL4-1.0-AⅡ model is listed with a rated steam capacity of 4 t/h, working pressure of 1.0 MPa, rated steam temperature of 184.07°C, feedwater temperature of 20°C, thermal efficiency of 86.6%, and exhaust gas temperature of 131°C. A DZL20-1.6-AⅡ model is listed with a rated steam capacity of 20 t/h, working pressure of 1.6 MPa, rated steam temperature of 204.31°C, feedwater temperature of 105°C, thermal efficiency of 88.1%, and exhaust gas temperature of 132°C.

These examples show why capacity and pressure should be selected together. Send the process steam load, pressure, steam temperature, feedwater temperature, fuel type, and grate preference when requesting a quotation or technical proposal.

Confirm the system type before ordering

This product is intended to generate steam. A plant that needs circulating hot water for space heating or a liquid-phase heat-transfer system should specify that requirement separately, because those duties use different boiler configurations.

For a steam application, the buyer should also provide the steam distribution layout, operating schedule, required connection points, boiler-room dimensions, fuel-handling arrangement, and flue-gas route. Those details allow the supplier to match the boiler model to the working conditions instead of sizing it from steam capacity alone.