Hot air supply system for belt type roasting machine

Abstract

The invention belongs to the technical field of belt type roasting machine pelletizing techniques, and particularly relates to a hot air supply system for a belt type roasting machine. The hot air supply system is characterized by comprising a pulverized coal bin, wherein a pneumatic pulverized coal transmission device and a dust collection device are arranged at the top of the pulverized coal bin; an anti-blocking safety protection device, a valve body and a pulverized coal metering scale are arranged at an outlet of the bottom of the pulverized coal bin; the pulverized coal metering scale is connected with a coal injection Roots blower and a combustion-supporting Roots blower; the coal injection Roots blower and the combustion-supporting Roots blower are respectively connected with a powdered coal combustor in a pulverized coal combustion chamber by connecting pipelines; the pulverized coal combustion chamber is connected with a hot air pipeline I and a hot air pipeline II respectively; the hot air pipeline I is arranged above an upper shield of a roasting section of the belt type roasting machine; the hot air pipeline II is arranged above an upper shield of a soaking section of the belt type roasting machine; and a temperature measuring device is arranged in the pulverized coal combustion chamber. The hot air supply system is simple in structure, reasonable in design, high in automation degree, and stable in system operation; the belt type roasting machine can use pulverized coal as a fuel; the temperature is easy to control; and the heat efficiency of the pulverized coal is high.

Description

technical field [0001] The invention belongs to the technical field of belt roaster pellet technology, and in particular relates to a belt roaster hot air supply system. Background technique [0002] The belt roaster process is a very mature pellet production process. The entire process is concentrated in one machine, and the production efficiency is high, so it is suitable for large-scale pellet production; the investment and operating costs of the belt roaster process are relatively low, and its ball layer is relatively static, so the requirements for the strength of green pellets It does not need to be too high; the belt roaster process adopts direct heat recovery and fan return, which makes the most possible use of the physical heat of cooling and roasting waste gas; because the belt roaster process uses cheap solid fuels, it further promotes "energy saving". "Type" development, still maintains the most important position in various pellet production methods. However, ...

AI Technical Summary

Problems solved by technology

However, the belt roaster, especially the hot air supply system, also has disadvantages: 1) The consumption of high-temperature-resistant special alloy steel is large and the grade is high

It is quite difficult under the current localization conditions, especially in terms of quality; 2) In the production process, the stability of raw materials is highly required

3) The quality of the finished pellets is uneven

In addition, the temperature inside the furnace hood and the more or less edge effects on the trolley will also affect the quality of the finished pellets

4) Gas and heavy oil with high calorific value must be used as fuel

Due to the constraints of fuel production and control of production costs, the belt roaster has not been greatly developed in my country.

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