With the acceleration of urbanization, the treatment of solid waste has become an increasingly prominent problem. To solve this problem, many cities have adopted solid waste incinerators for waste disposal. However, in the process of solid waste incineration, a large amount of flue gas waste heat will be generated, and if it cannot be effectively utilized, it will not only cause energy waste, but also cause certain pollution to the environment. Therefore, how to effectively utilize the system-level flue gas waste heat of solid waste incinerator has become a hot issue in current research.
The principle of system-level flue gas waste heat utilization of solid waste waste incinerator is to convert the waste heat generated by the waste in the incineration process into available energy, so as to realize the recycling of energy. At present, the common methods of flue gas waste heat utilization are: waste heat boiler power generation, waste heat heating, waste heat refrigeration, etc. Among them, waste heat boiler power generation is a more common method. With a waste heat boiler, the waste heat in the flue gas can be converted into steam or hot water, which can then be used to generate electricity. This method not only makes efficient use of the waste heat of the flue gas, but also provides a certain amount of electricity for the city**.
In practical application, the system-level flue gas waste heat utilization of solid waste waste incinerator needs to pay attention to the following aspects:
1.Stability of flue gas temperature.
Flue gas temperature is one of the key factors for the utilization of flue gas waste heat. In the waste incineration process, the flue gas temperature will be affected by a variety of factors, such as the calorific value of the waste, the flow rate and temperature of the combustion air, etc. Therefore, in order to ensure the stability of the flue gas temperature, it is necessary to stir and mix the waste sufficiently, and at the same time control the flow and temperature of the combustion air.
2.Complexity of flue gas composition.
The composition of solid waste is complex, and there are many harmful substances in the flue gas, such as dioxins and heavy metals. These harmful substances will not only cause corrosion and wear to waste heat utilization equipment, but also cause certain pollution to the environment. Therefore, in the utilization of flue gas waste heat, corresponding measures need to be taken, such as the use of corrosion-resistant materials, the addition of dust removal equipment, etc., to reduce the impact of harmful substances in the flue gas.
3.The economics of energy use.
The utilization of flue gas waste heat needs to take into account the economics of energy utilization. While ensuring the efficient use of energy, it is necessary to consider the investment cost and operating cost of the equipment. Therefore, when choosing the utilization method of flue gas waste heat, it is necessary to evaluate and compare the economy according to the actual situation.
4.Compliance with environmental requirements.
With the continuous improvement of environmental protection requirements, flue gas emission standards are becoming more and more stringent. In the utilization of flue gas waste heat, it is necessary to ensure that the emitted flue gas meets the relevant standards and regulations, and at the same time take corresponding environmental protection measures, such as adding dust removal equipment and using low-nitrogen burners.
Case description: A municipal waste-to-energy plant adopts the system-level flue gas waste heat utilization technology of solid waste incinerator. This technology converts the waste heat generated during the waste incineration process into steam, which is then used to generate electricity. In order to ensure the efficient use of waste heat from flue gas, the power plant adopts the following measures: first, the waste is fully stirred and mixed, and the flow and temperature of the combustion air are controlledSecondly, measures such as using corrosion-resistant materials and increasing dust removal equipment are used to reduce the impact of harmful substances in the flue gasFinally, according to the actual situation, the economic evaluation and comparison are carried out, and the appropriate flue gas waste heat utilization method is selected. Through the implementation of these measures, the waste-to-energy plant not only achieves efficient use of energy, but also meets environmental requirements. In short, the system-level flue gas waste heat utilization of solid waste incinerator is an effective way to recycle energy. In practical application, it is necessary to take into account the influencing factors such as the stability of flue gas temperature, the complexity of flue gas composition, the economy of energy utilization and the compliance of environmental protection requirements. By taking corresponding measures and technical means, the effective utilization of flue gas waste heat at the system level of solid waste incinerator can be realized, and contribute to the sustainable development of the city. List of high-quality authors