Carrier gas recycling system

#The present invention relates to a recycling system, and more particularly to a recycling system designed according to the procedures in which a carrier gas passes through a reactor, such as a fluidized bed reactor, so as to recycle gas generated in the reaction.

#While the highly advanced technologies bring a lot of conveniences to human, they also cause many serious damages to people's living environment. Therefore, it has become a focus among all countries in the world to develop a reasonable way of waste disposal. To comply with the increasingly strict demands for environment protection, different waste decomposition processes are developed. Among others, the so-called fluidized bed reactor has drawn the world's attention.

#Please refer to FIG. 1 that is a block diagram of a conventional fluidized bed reactor. As shown, the fluidized bed reactor includes a reactor 10, into which charges 11 are fed. To enhance the mass-energy transfer function of the reactor 10, a carrier gas 12 is applied in the operation of the reactor 10. The carrier gas 12 serves to assist in heat supply, mass transfer, etc., and is sometimes used as part of the reactant in the reaction. The product from the reaction in the reactor 10 is then sent to and condensed and deposited in a condensation tank 20 to generate an oil-water mixture 21 and a mixed gas 22 containing the carrier gas 12.

#The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein

#FIG. 1 is a block diagram showing the implementing process of a conventional fluidized bed reactor;

#FIG. 2 is a block diagram showing the implementing process of another conventional fluidized bed reactor with gas recycling;

#Please refer to FIG. 3 that is a block diagram of a carrier gas recycling system according to the present invention designed for mounting in a fluidized bed reaction system, so that part of the gas generated in the reaction is recycled and guided to a reactor thereof to substitute for the carrier gas needed in the operation of the fluidized bed reaction system.

#As shown in FIG. 3, the carrier gas recycling system of the present invention includes a reactor 10, a condensation tank 20, a filtering unit 30, a constant pressure tank 40, a transfer device 50, a pre-heater 70, and a backup carrier gas tank 80. The reactor 10 is used to receive and combine charges with a carrier gas to generate a mixture and gas. The condensation tank 20 receives the mixture and gas produced by the reactor 10, separates the oil and water in the mixture from each other, separates and purifies the reaction-generated gas, and delivers the reaction-generated gas to the filtering unit 30. The filtering unit 30 may use a static precipitator to remove particulate pollutant, so as to ensure that the reaction-generated gas is free of any oil-gas deposition and accumulation before being sent into the transfer device 50. The filtered reaction-generated gas is then output via to paths to the constant pressure tank 40 and the transfer device 50 separately.

#After receipt of the reaction-generated gas, the constant pressure tank 40 on the one hand maintains a constant pressure in the system balancing with the external atmosphere, and on the other hand outputs the reaction-generated gas for burning (that is, waste gas burning). When the transfer device 50 receives the reaction-generated gas, it recycles and feeds the reaction-generated gas back to the reactor 10, so that a reaction-generated gas circulation loop is formed. The reaction-generated gas is preheated by the pre-heater 70 before being sent into the reactor 10. The preheated reaction-generated gas substitutes for the carrier gas and is cyclically supplied to the reactor 10. The transfer device 50 is also connected to the backup carrier gas tank 80, in which an amount of carrier gas is stored. Before the system has generated any gas, or before the system is actuated, the carrier gas in the backup carrier gas tank 80 is output to maintain system operation.