In the waste incineration power plant, the waste comes into the plant and is weighed in the weighing room and sent to the unloading hall; in order to be able to enhance the calorific value of the waste, the waste in the bin will be fermented for 5-7 days, and the leachate formed will be collected in a special leachate pond by dumping the material through the waste crane, and the fermented ground will be caught into the waste hopper.
Waste incineration is carried out in a special incinerator, which will go through the drying section grate, combustion section grate and combustion section grate to make the waste fully burned, and according to the specification, the temperature of the flue gas needs to be controlled above 850℃ to ensure the residence time is more than 2 seconds.
When using medium and high temperature waste heat, the flue gas of waste incineration enters the waste heat boiler, which transfers heat through the heating surface of the boiler, and then heats the boiler work, which evaporates to drive the turbine unit to generate electricity.
In the flue gas treatment work, the flue gas discharged from the waste heat boiler is introduced into the semi-dry deacidification reactor tower rotary atomizer, which absorbs the acid in the flue gas with alkaline liquid; the subsequent flue gas passes through the activated carbon injection system and bag filter and then enters the emission stack, and the online monitoring system on the stack implements monitoring of the emission process.
The flue gas discharged from the waste heat boiler is purified by de-acidification and dust removal, and the flue gas temperature is around 150℃, and the low temperature waste heat can still be further utilized.
In the flue gas low-temperature waste heat utilization ORC system, the organic mass is used for Rankine cycle, and the system configuration is shown in Figure 1. The organic mass absorbs heat at constant pressure in the evaporator, then does work adiabatically in the expander, the spent steam exerts heat at constant pressure in the condenser, and finally performs adiabatic compression in the mass pump, and then returns to the original power cycle process.
The use of organic mass can make better use of low-temperature waste heat, improve the energy utilization efficiency of the system, and reduce carbon dioxide emissions, the system's heat source utilization efficiency will have a relatively large increase, so as to fully drive the system power generation, so that the system's heat energy into electricity, the spent steam can be condensed into liquid form to achieve the purpose of energy recovery.