Dual-ring-chamber alternate heating self-dust-removing intelligent roasting device and roasting method

Abstract

The invention discloses a dual-ring-chamber alternate heating self-dust-removing intelligent roasting device and a roasting method. The dual-ring-chamber alternate heating self-dust-removing intelligent roasting device comprises two sets of symmetrically-arranged ring chamber heating roasting fluidized bed systems, and a communication flue is arranged between the two sets of ring chamber heating roasting fluidized bed systems. The upper ends of the ring chamber heating roasting fluidized bed systems are provided with a middle bin and are connected with a feeding system through the middle bin. A finished product bin is arranged at the lower ends of the two sets of ring chamber heating roasting fluidized bed systems. By means of the dual-ring-chamber alternate heating self-dust-removing intelligent roasting device and the roasting method, production of the caustic calcined magnesite industry meets the production technological requirements for clean production, energy conservation, emission reduction, good quality and high efficiency. Advanced energy-saving and environment-friendly type roasting equipment is studied and developed, resource utilization of the roasting technology and the magnesite industry of magnesian raw materials is of far-reaching historical significance and important practical significance and is also required by environment-friendly metallurgy and substainable development.

Description

technical field [0001] The invention relates to the field of ore raw material calcination products in the metallurgical industry or the building materials, ceramics, and refractory industries, and in particular to a double-ring chamber for alternate heating and self-filtering intelligentization of magnesite calcination and limestone, kaolin, pellets, etc. A calcining device and a calcining method. Background technique [0002] At present, domestic metallurgical industry's pellet ore, building material industry's limestone, ceramic raw material's kaolin ore and magnesia raw material and other calcining equipment are old and the technology is backward, all of which are in high energy consumption and high pollution industries. Especially the light-burned magnesite industrial clusters in Haicheng and Dashiqiao in southern Liaoning. The calcined magnesia kiln in this area is a reverberatory kiln introduced from the former Soviet Union in the early 1950s. Due to the small scale of...

AI Technical Summary

Problems solved by technology

[0004] 1) High energy consumption and low thermal efficiency

[0005] ①The discharge temperature of the finished product is generally as high as 700-800°C, without cooling and waste heat recovery measures, the sensible heat of the red material is completely wasted, and the thermal efficiency of the kiln is low;

[0006] ② There is no preheating process for raw materials, and the preheating zone of the kiln body is short, the exhaust gas temperature is high, the heat loss of the exhaust gas is large, and the energy consumption is high;

[0007] ③Manual operation, unable to control the air-fuel ratio, incomplete combustion or excessive air excess coefficient, etc. cause fuel waste

[0008] 2) Heavily polluted fuel structure, outdated technology and poor temperature uniformity

[0009] Taking the fuel structure of the kilns in the light-burned magnesium industry as an example, there are several kinds of fuels for the light-burned magnesium kilns in Haicheng and Dashiqiao, and the coal-fired kilns are the most backward. Kiln calcination, without temperature detection and control means, incomplete combustion of fuel, poor temperature uniformity, not only serious waste of energy, but also heavy pollution

[0010] In recent years, some enterprises have used producer gas and heavy oil as fuel. Although they have improved compared with coal fuels, tar and phenol water will inevitably be generated during the conversion of coal into producer gas, which will bring pollution to the environment that cannot be eliminated.

[0011] The existing shaft kiln using heavy oil fuel has poor atomization effect of heavy oil, no enough combustion space, backward combustion automation control, low fuel combustion efficiency, uneven calcination temperature, frequent over-burning causes energy waste and product defects

[0012] 3) The kiln type and structure are backward

[0013] ①The old-fashioned reflection kiln type has backward calcination technology, poor sealing and low output;

[0014] ②The kiln body device lacks material flow distribution and flow diversion facilities, which affects the heat penetration speed and depth of the flame, and cannot fully realize the effective heat transfer between the material flow and the energy flow, which eventually leads to fuel waste and poor calcination temperature uniformity

[0015] 4) Low level of automation control and poor product quality

Therefore, there is no scientific basis for the combustion structure of the calcination process, and there is no dynamic regulation of the air-fuel ratio, which often results in consequences such as over-burning into mounds or poor product activity due to under-burning

[0017] 5) Low degree of mechanization and low output

[0018] Intermittent manual discharge method is adopted, without quantitative control, product quality is unstable, production continuity is poor, manual labor intensity is high, and productivity is low

[0019] 6) Serious pollution

[0020] ① Open manual unloading, disorderly discharge, and large dust, resulting in serious dust content in the workshop and the surrounding atmosphere;

[0021] ②Fuel combustion lacks precise and intelligent control, SO 2 , NOx emissions exceed the standard;

[0022] ③ There is no method for emission detection, the dust removal system is not perfect, and the environmental protection is not up to standard

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