Chemical reactors are used in many ways, from medical treatment and research to depth measurements at oil drill sites, sterilization of food production facilities, and inspecting packages and cargo at security checkpoints. But they can be extremely dangerous. Electricity plays a crucial role in all these systems, and enhancing electricity’s ability to target the reaction mechanism or thermal energy supply is one of the biggest challenges and necessary developments in the future.
Reactors produce electricity by splitting atoms in a chain reaction. The heat generated by this process is harnessed to turn water into steam to drive turbines and generators. The resulting electricity is then exported to the grid. In most reactors the fission reaction is ‘controlled’ by increasing or decreasing its power levels using a series of rods which are inserted into the fuel bundle to inject more or less reactivity, and to prevent the chain reaction gaining uncontrollable momentum (a positive void coefficient). The design of these control rods is rigorously tested before use in nuclear reactors. If the nuclear reactor is damaged and can no longer be cooled by water, radioactive materials such as iodine-131 which has a short half-life of 8 days and caesium-137 which has a 30 year half-life, may release into the environment. These are the primary health hazards from a reactor accident, especially if the plant is not contained. For this reason most modern nuclear reactors have a defence-in-depth design. This uses multiple redundant systems which operate independently of each other, with a strong emphasis on physical barriers and redundancy.
Chemical reactors are the heart of a chemical plant, so their high performance is critical to overall process viability. They must meet stringent design requirements covering energy efficiency, environmental impact and quality of the final product. They must also be constructed of materials that are compatible with reactants and products.
Reactors can be continuous or batch, and they can accommodate solids or liquids (reagents and product) or gases. Continuous reactions are usually run in steady state, but batch reactions must be timed to optimize use of fermentation and separation equipment. Reactor kinetics drive the overall reaction rate, and the reactor must be designed for maximum conversion and minimum power consumption. Temperature is another important factor, as different reactions require varying temperatures for optimal conditions. For exothermic reactions the temperature must be carefully controlled to prevent a runaway reaction that can lead to the accidental release of radioactivity. The pressure of a reactor is also a critical variable as increasing the pressure makes it easier to separate a product, shifts the equilibrium phase of a reaction, or increases the reaction rate.
A chemical buy reactors is a vessel that holds reactants, monitors their behavior and provides ports for input and output of products. It usually does not reach a steady state and needs to be carefully controlled to ensure that the reaction is proceeding correctly and safely. Inside the core of a nuclear reactor there are bundles of fuel rods, each about the size of a gel-type ink pen. Each fuel rod is filled with pellets of uranium, which have fissionable nuclei.
The resulting fission reaction produces heat, which in turn makes the water in the core boil. The boiling water, in turn, creates steam which drives an electric generator to produce electricity. Click here or navigate to our official website to discover exclusive offers on used reactors.
