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

Abstract

The invention relates to an air furnace blowing coom grinder system and smoke non dehydraulization self circulation method, which comprises feeding inertia gas to the enclosed coal feeder, heating up the grinder exhaust smoke, heating up the coal powder inertia, preventing the self combustion of the coal powder, feeding inertia to the cloth bag powder collector, preventing the leaking of air to the system, reducing the content of oxygen, sending it back to the grinder system for heating up, to achieve recirculation. It is economical in investment, low in energy consumption, and making use of the waste for making oxygen. It has more extensive use compared with existing technology.

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...

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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

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