Utilisation of low-temperature waste heat generation from flue gas in waste incineration plants

Utilisation of low-temperature waste heat generation from flue gas in waste incineration plants

Waste incineration plant flue gas low temperature waste heat power generation utilisation is an environmentally friendly and resource utilisation technology. Waste incineration is a process in which solid waste is burned and converted into energy, generating a large amount of flue gas in the process. The flue gas contains high-temperature heat, but also contains low-temperature waste heat, which is usually emitted into the atmosphere resulting in a waste of energy.

In order to maximise resource efficiency and reduce environmental pollution, a common practice is to utilise the low-temperature waste heat from the flue gases of waste incineration plants to generate electricity. This process typically involves the following steps:

Flue gas pre-treatment: The flue gas first passes through pre-treatment equipment to remove solid particulate matter and toxic substances from it, thereby reducing corrosion and damage to subsequent equipment.

Flue gas cooling: The flue gas is next passed through a flue gas heat exchanger or waste heat recovery unit to cool it to a lower temperature. During this process, some of the waste heat is transferred to the working medium, usually water or steam.

Steam power generation: After the flue gas has been cooled the flue gas still contains a certain amount of heat energy, which is transferred to water or steam through a waste heat recovery unit to be converted into high-pressure steam. This high pressure steam can be used to drive a turbine generator to produce electricity.

Generation capacity: Generators produce electricity by rotating and converting the low temperature waste heat produced by the waste incineration plant into electricity.

Desulphurisation and denitrification: In this process, the flue gas may also contain some harmful gases such as sulphur dioxide and nitrogen oxides, which need to be desulphurised and denitrified to reduce the impact on the environment.

By utilising the low-temperature waste heat from the flue gases of waste incineration plants to generate electricity, not only can energy wastage be reduced, but also more clean energy can be provided to the local area, reducing the demand for conventional energy. At the same time, the technology can also reduce harmful substances emitted into the atmosphere during waste incineration, which has a positive impact on environmental protection.