Introduction

 

The customer in this case is a medium-sized Italian glassworks specialising in the production of hollow glass. The purpose of this plant is the filtration of gas from two glass-melting furnaces.

 

Problem

 

Due to the type of furnaces that operate continuously 24/24 h 365 days a year, the flue gas has a constant temperature of approximately 500°C. The requirements of the customer were efficient dedusting and SOx neutralization as well as energy recovery.

 

Solution

 

TVT proposed and realized a solution of flue gas treatment comprising the basic reagent dosing and injection system, the hot gas filtration system with ceramic media, and downstream energy recovery on the clean side.

The flue gas arriving from the kiln intake points, undergo two treatments before entering the filter: temperature regulation and the injection of the reagent (hydrated lime), the purpose of which is the neutralization of compound acids.

In this plant, the filter system consists of a ceramic candle filter treating a gas flow rate of 70,000 m3/h at the temperature of 450°C.

Afterwards, the flue gas enters the heat recovery section of the plant consisting of two shell and tube heat exchangers, the first capable of recovering up to 1,500 kW and the second up to 500 kW of heat.

The transformation of the recovered heat into electrical energy is carried out by an ORC (Organic Rankine Cycle) system connected to the two exchangers.