A belt roaster thermal system capable of precise heating and its control method

Abstract

A belt type roasting machine thermal system capable of precisely supplying heat includes a belt type roasting machine body (1), a belt type roasting machine combustion heating supply system (2), a general gas regulating valve (8), a pre-heating section smoke regulating valve (9), a roasting section smoke regulating valve (10), a pre-heating section inlet pelletizing temperature detecting device (11) and a roasting section outlet pelletizing temperature detecting device (12); and the belt type roasting machine body (1) is sequentially provided with a blowing drying section (101), a pumping drying section (102), a pre-heating section (103), a roasting section (104), a heat uniformizing section (105), a first cooling section (106) and a second cooling section (107), and the belt type roastingmachine combustion heating supply system (2) includes a combustion chamber, a gas pipeline (201) and a combustion system air supply duct (202). According to the belt type roasting machine thermal system capable of precisely supplying heat, total heat and heat in every section can be precisely calculated according to a real-time condition of the pellet temperature of the two heated sections of thepre-heating section and the roasting section, and the effective use and equitable distribution of heat can be achieved.

Description

technical field [0001] The invention relates to the technical field of roasting process in the metallurgical industry, in particular to a belt roaster thermal system capable of precise heat supply and a control method thereof. Background technique [0002] Oxidation pellets are one of the important methods of fine ore agglomeration. The ore concentrate powder is first dried in a drying kiln, and then rolled to a suitable strength, and then an appropriate amount of water and binder are added to the pelletizer to make green balls with uniform viscosity and sufficient strength. The green balls are preheated and roasted in an oxidizing atmosphere to make the green balls agglomerate and react chemically to make pellets. The oxidation pellet process is especially suitable for the treatment of fine ore concentrates. The produced pellets have good cold strength, reducibility and particle size composition. In the iron and steel industry, pellets are an important blast furnace char...

AI Technical Summary

Problems solved by technology

[0005] In the production process of the thermal system of the belt roaster in the prior art, affected by various factors, the temperature of the pellets when entering the heating section is constantly fluctuating and changing. In this case, due to the lack of effective The control method and device of the heating system, the following two problems will appear in the production of the belt roasting machine:

[0006] 1. Excessive heat supply: If there is too much heat supply, the pellets will absorb too much useless heat in the heating section, so that the temperature of the pellets will be too high when entering the cooling section, which will cause the cooling section to ensure that the export material Wen has to use a high-power cooling fan to cool the pellets, which is undoubtedly a serious waste of electricity resources;

[0007] 2. Insufficient heat supply: If there is insufficient heat supply, the pellets cannot absorb enough heat in the heating section, the internal roasting process cannot be carried out, and the oxidation chemical reaction cannot be fully developed, resulting in a The proportion of finished pellets in the type roaster decreased, and the defective rate increased

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