Cement raw meal vertical pipe rotary spray preheater and preheating and decomposing system

Abstract

The invention discloses a cement raw meal vertical pipe rotary spray preheater, which comprises a rotary spray barrel body, feed pipes and a vertical pipe coaxially arranged in the rotary spray barrel body, wherein the bottom part of the vertical pipe extends out of the rotary spray barrel body; the top part of the rotary spray barrel body is provided with an air outlet, at least two aggregate bins are uniformly distributed on the bottom part along a circumferential direction, and the bottom part of each aggregate bin is provided with a discharge hole; the top part of the vertical pipe is provided with a material guide cone, a plurality of rotary spray nozzles are uniformly distributed on the side wall of the vertical pipe below the material guide cone along a circumferential direction, amatched curved cyclone deflector is arranged in each rotary spray nozzle, the lower part of the vertical pipe is fixedly connected with the aggregate bins, and at least two feed openings are uniformly distributed on the side wall of the lower part of the vertical pipe along a circumferential direction; and the lower parts of the at least two feed pipes are connected with the feeding openings of the vertical pipe. The preheater and a preheating and decomposing system comprised of the same of the invention have small system resistance, reduce system heat and power consumption considerably and simplify and reduce system equipment.

Description

technical field [0001] The invention relates to a preheater for preheating granules or powder materials, in particular to a standpipe rotary jet preheater and a preheating decomposition system for preheating cement raw meal powder. Background technique [0002] The main function of the preheater is to use the enthalpy in the hot air discharged from the rotary kiln and calciner to heat the raw material, so that it can be preheated and partially decomposed carbonate, and then enter the calciner or rotary kiln to continue heating break down. [0003] The heat exchange unit equipment of the existing preheater mainly includes two types: the cyclone (including the connecting pipe) and the vertical cylinder (vortex chamber). Due to some problems in the structure of the vertical cylinder preheater, its various economic indicators are difficult to be the same. The cyclone preheater is comparable, so most of the existing preheaters adopt the cyclone structure. [0004] Existing cycl...

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned cyclone preheater and preheating decomposition system have the problem of large system resistance, which is mainly divided into the following three reasons: (1) The speed of feed gas in the existing preheating decomposition system is relatively large, generally at 15m / s, and because the resistance is proportional to the square of the airflow velocity, the system resistance is relatively large; (2) the height of the existing single-stage cyclone preheater is relatively high, and the structure of crossing the left and right further increases the material The moving route of the gas, and the longer the route, the more factors that generate local resistance and the greater the system resistance; (3) Since the gas mixed in the cyclone preheater enters the cylinder from the tangential direction, centrifugal force is generated with the rotation of the cylinder , the large-mass powder group is separated to the outside, the material rubs against the cylinder, and gradually settles, and the gas flows out from the air outlet pipe of the inner cylinder. Since the material gas enters the cylinder and rotates for less than a circle, the rotating material gas re-connects with the cylinder. The material gas at the air inlet intersects, and the incompletely separated material gas mixes with the newly entered material gas, and then rotates and re-separates, which affects the separation efficiency; and the running direction and route of the material gas here are very complicated, which greatly increases the material gas flow rate. Air running resistance increases the system resistance and increases the power consumption of the system

Images