Blast furnace blowing bituminous coal grinding machine system and its smoke non-dewatering self-circulation technology

Abstract

The present invention relates to a mill system for blast furnace injection of bituminous coal and its flue gas non-dehydrating self-circulation technology. The technical method is a feasible technology for blast furnace injection of coal. The method includes: feeding coal to a closed Fill the machine with inert gas to increase the temperature of the flue gas at the outlet of the mill and heat the inert gas used in the pulverized coal bin to prevent spontaneous combustion of the pulverized coal in the pulverized coal bin; fill inert gas into the bag powder collector to prevent the leakage of pulverized coal The air in the upper space of the warehouse leaks into the system from the cloth bag to reduce the oxygen content of the system; then it is sent from the bag powder collector through the main smoke exhaust fan and then returned to the heating furnace in the mill system for heating to achieve circulation. use. The invention can save investment and reduce energy consumption in the technological process of injecting bituminous coal, and at the same time, wastes from oxygen plants (atmospheric pressure nitrogen pollution) are utilized. Compared with the prior art, it also meets the requirements of the "Explosion-proof Safety Regulations for Blast Furnace Injection Bituminous Coal System" of blast furnace injection bituminous coal, and has wide adaptability.

Description

technical field [0001] The invention relates to the technical field of pulverized coal injection in blast furnaces, in particular to a mill system for bituminous coal injection in blast furnaces and a non-dehydrating self-circulation technology for flue gas. Background technique [0002] In the existing grinding and injection of bituminous coal powder, measures must be taken in the design and production process to control the risk factors such as spontaneous combustion of coal powder, induced fire and explosion. For this reason, the State Bureau of Technical Supervision issued on September 25, 1996 The "Explosion-proof Safety Regulations for Blast Furnace Injection Bituminous Coal System" <gb16543-1996>. For the mill system, there is an important regulation <5.4.1 in the safety regulations>: inert gas should be used as the drying medium in the system for making pulverized coal, and the designed oxygen content at the end of the negative pressure system should not...

AI Technical Summary

Problems solved by technology

[0006] However, in the prior art, in order to use blast furnace hot blast stove flue gas, it is necessary to generate hot blast stove flue gas, etc., it is very difficult to use hot blast stove flue gas, and the investment is very high, and some even cannot be used.

In addition, for the milling workshop without hot blast stove flue gas, it is also impossible to quote

Similarly, during the blast furnace hot blast stove changeover period, the composition of the blast furnace hot blast stove flue gas is likely to change, and the CO and O2 components fluctuate periodically, which is very unfavorable to the safety of the pulverizing system, and the production of the pulverized coal preparation workshop is affected by the shutdown of the blast furnace. The influence of stopping air supply and maintenance

[0007] It can be seen that the above-mentioned existing blast furnace injection bituminous coal mill system obviously still has inconvenience and defects in the production method and use of pulverized coal, and needs to be further improved urgently.

In order to solve the problems existing in the pulverized coal production method of the existing blast furnace injection bituminous coal mill system, technicians in related fields have tried their best to find a solution, but no suitable design has been developed for a long time Complete, but there is no appropriate method to solve the above problems, which is obviously a problem that the relevant industry is eager to solve

Images