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Waste Heat Boiler for a Galvanized Steel Pipe Plant

The waste‑heat boiler used in the galvanized steel pipe plant utilizes the waste‑heat flue gases generated by the zinc‑melting furnace. After being recovered by the waste‑heat boiler, these flue gases are discharged into the atmosphere, having first passed through the superheater, the boiler body, and the water heater (economizer). The saturated steam produced in the boiler body is further superheated to become superheated steam, which is then employed for internal purging of the tubes. Following passage through the superheater and the boiler body, the flue gases still retain a significant temperature; this residual heat is transferred to the water heater (economizer) before final discharge. The hot water exiting the economizer is subsequently reused to heat the acid‑pickling solution for the tubes. Through this comprehensive series of waste‑heat recovery processes, thermal energy utilization is greatly enhanced, making a substantial contribution to the enterprise’s efforts in energy conservation and consumption reduction.

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Waste Heat Boiler for a Galvanized Steel Pipe Plant

Product Overview

The waste‑heat boiler used in the galvanized steel pipe plant utilizes the waste‑heat flue gases generated by the zinc‑melting furnace. After being recovered and utilized in the waste‑heat boiler, these flue gases are discharged into the atmosphere via the superheater, the boiler body, and the water heater (energy‑saving device). The saturated steam produced in the boiler body is superheated to become superheated steam, which is then employed for internal purging of the tubes. Following passage through the superheater and the boiler body, the flue gases still retain a significant temperature; this heated flue gas is further exchanged with the water heater (energy‑saving device) before being released. The hot water exiting the water heater (energy‑saving device) is subsequently used to heat the acid‑pickling solution for the tubes. Through this comprehensive series of waste‑heat recovery processes, thermal energy utilization is greatly enhanced, making a substantial contribution to the enterprise’s efforts in energy conservation and consumption reduction.

1. Flue Gas Flow Diagram

2. Steam–Water Flow Diagram of the Waste Heat Boiler at the Galvanizing Plant

3. Main Technical Parameters of the Waste Heat Boiler (Steam Generator) at the Galvanized Pipe Plant

(1) Rated evaporation capacity: 0.5–2.5 t/h (selected based on the parameters of the zinc‑dissolving furnace)
(2) Rated steam pressure: 1.25 MPa to 1.6 MPa
(3) Rated steam temperature: 194°C to 201°C
(4) Superheated steam temperature: 500±20℃
(5) Economizer: 60±5℃

4. Optional factory‑supplied auxiliary equipment (available for separate purchase)

(1) Boiler Body
(2) Superheater
(3) Economizer (Energy-Saving Device)
(4) Water Treatment Unit
(5) Soft Water Tank
(6) Soda Sampler
(7) Valves and Instruments
(8) Electrical Control Unit
(9) Boiler Feedwater Pump
(10) Economizer Hot Water Circulation Pump
(11) Materials required for installation (chimneys, flues, etc.)

5. Example photos of the installation at the galvanizing plant site

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