Vertical YLL coal fired chain grate thermal oil boiler vs DZL steam boiler

Quick comparison

Operating requirements

The YLL model range in the product table covers 700 to 2,000 kW, with circulating oil volume from 60 to 160 m³/h. Its listed boiler oil volume ranges from 0.58 to 1.9 m³. These figures matter when sizing the circulation loop, expansion arrangement, pumps, and connected process users.

The DZL range is expressed as steam capacity, from 1 to 20 t/h. Rated pressure varies by model from 0.7 to 1.25 MPa, and rated steam temperature ranges from 170 to 194°C. A plant that needs steam production should size the selected DZL model around steam rate, pressure, and steam temperature, rather than comparing its t/h rating directly with the YLL kW rating.

Picture a process line that needs a stable high-temperature oil circuit. The YLL operating data gives the design team a 320°C maximum medium temperature and oil circulation values to use when checking pumps and pipework. For a steam user, the DZL pressure and temperature range sets the starting point for steam-side equipment selection. Send the required heat medium, design pressure, operating temperature, and demand profile with the inquiry.

Interfaces and layout

The YLL boiler has listed connecting pipe diameters of 100 or 150 mm, depending on capacity. Its listed dimensions range from 4,710 to 5,821 mm in length, 1,830 to 2,050 mm in width, and 4,145 to 5,983 mm in height. Weight ranges from 10,746 to 21,365 kg.

DZL dimensions are given by model and range from 4.6 × 2.2 × 2.9 m for the 1 t/h model to 8.6 × 3.65 × 3.54 m for the 20 t/h model, with some larger models identified as unpackaged parts. Listed weight ranges from 15 to 69 t total. These figures should be checked against the route from unloading point to boiler room, lifting equipment, foundation, and service clearance.

A practical layout check starts at the doorway and ends at the final foundation position. For the YLL, compare the selected unit's height and connecting pipe diameter with the building and circulation loop. For the DZL, check the model-specific length, width, height, weight, and whether the listed configuration arrives as unpackaged parts before planning transport and installation.

Combustion and maintenance points

Both products use an automatic chain grate for solid-fuel handling. The YLL description identifies automatic coal removal and slag removal, along with mechanical forced combustion and a special furnace arch. The DZL description identifies an automatic chain grate, a sealed wind box, an arched furnace design, and a drum arrangement intended to reduce sludge settling at the drum bottom.

The routine inspection focus therefore differs with the heat-transfer system. On the YLL, the heating surface is fully fused by argon-shielded welding, receives X-ray inspection, and passes a water pressure test. The top coil and furnace tubes are part of the thermal-oil heating arrangement, so inspection planning should include the heating surface, oil circuit, grate, and slag-removal path.

On the DZL, the arched tube sheet, spirally corrugated tubes, ascending calandria, drum, wind box, and grate are the main equipment features to include in the maintenance plan. The product data also lists tube-integrity and grate-wear checks. Confirm the inspection intervals, access clearances, water treatment requirements, and operating procedures for the selected model before ordering.

Which boiler suits which buyer?

Choose the Vertical YLL coal fired chain grate thermal oil boiler when the process requires a circulating thermal-oil system with a listed maximum medium temperature of 320°C, oil circulation from 60 to 160 m³/h, and a 1.1 MPa working pressure. Review the Vertical YLL coal fired chain grate thermal oil boiler details alongside the selected capacity.

Choose the Coal or biomass fired DZL automatic chain grate steam boiler when the plant requires steam in the listed 1 to 20 t/h range, with rated pressure from 0.7 to 1.25 MPa and rated steam temperature from 170 to 194°C. The decision should follow the process medium first, then the required capacity and connection arrangement.

For a quotation, send the process medium, required output, design pressure, operating temperature, fuel type, available boiler-room dimensions, access route, and connection sizes.