Experimental Study on the Circulating Characteristics of the Return Particles in CFB and the Validity of the Particles to Desulphurization
The cold-model experimental system that particles flow from the top of CFB reactor is set up to study the circulating characteristics of the particles in the reactor. In order to get further information about the particles distribution and interaction with air flow, the two-phase gas-particle flow and particle concentration in the tower are studied with the use of phase-Doppler particle dynamic analyzer (PDA) system. The effects of the operating parameters including the mass flow rate and the superficial gas velocity on the process of the particles return to the main flow were investigated. The definition of valid internal circulation is put forward in this paper to describe the contribution of the particle to the SO 2 removal reaction. The results showed that the concentration distribution tends to be right high and left low in the radial direction. In axial, more particles concentrated in the upper of the reactor, especially in the case of high superficial gas velocity. With the decrease of the superficial gas velocity, the maximum fallback length of particle and the average particle concentration increase quickly. While the valid particle concentration increases slowly. The quantity of valid particles increases a little. Sending the particle from the top of the reactor has little contribution to the SO 2 removal reaction.
Circulating characteristics of return particles in circulating fluidized bed
In order to investigate the process of circulating particles returning to the main flow and to make the further discovery about the circulating characteristics of the particles in circulating fluidized bed(CFB).The cold model experimental system of the particle flowing from the top of the CFB was set up.The gas-particle two-phase flow and the mass concentration of particles in the tower were measured by using the phase-Doppler particle dynamic analyzer(PDA) system.The effects of the operating parameters including the mass flow rate and the superficial gas velocity on the process of the particles returning to the main flow were investigated.The results indicate that the process of the particles returning to main flow can be divided to three parts: the return field,the mixing and accelerating field and the main flow field.The return particles make the flow field become non-homogeneous.The main factors which influence the back flow length are the mass flow rate and the superficial gas velocity.
The Meaning of Wisdom in James: Examination of a Hypothesis
The following essay is an attempt to examine the manner in which the writer of the Epistle of James uses the concept of Wisdom; and to study the suggestion that the way in which he uses it is more or less interchangeable with that in which other writers of the New Testament use the concept of the Holy Spirit.