Boat pushing reducing furnace device and gas supply method

Abstract

The invention discloses a boat pushing reducing furnace device and a gas supply method and belongs to the technical field of powder metallurgy. The boat pushing reducing furnace device comprises furnace pipe hydrogen inlet pipelines and hydrogen return pipelines. The hydrogen inlet pipelines are provided with program control valves and bypass valves, and the bypass valves are normally-open valves.The hydrogen inlet pipelines comprise a first hydrogen inlet pipeline and a second hydrogen inlet pipeline. The first hydrogen inlet pipeline is provided with the first program control valve and thefirst bypass valve, and the second hydrogen inlet pipeline is provided with the second program control valve and the second bypass valve. A third program control valve is arranged on a main hydrogen return pipe, and a fourth program control valve is arranged between the hydrogen return pipelines and the hydrogen inlet pipelines. The gas supply method of the boat pushing reducing furnace device mainly comprises the step that the program control valves are controlled to be opened and closed. The problem that due to the fact that the barometric pressure of the interior of a furnace pipe and atmosphere is zero or unstable, and consequently a recovery system stops operating, and the recovery process cannot be smoothly carried out is solved, and hydrogen losses caused during blow-in feeding arereduced.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a boat push reduction furnace device and a gas supply method. Background technique [0002] In the field of powder metallurgy, the use of hydrogen to reduce powder is a common process method. The hydrogen reduction method is not only an important powder manufacturing method, but also an important powder deep processing method. According to the number of furnace tubes, push boat type reduction furnaces are divided into single-tube, double-tube, four-tube and multi-tube push boat furnaces. Multi-tube furnaces include 14-tube furnaces, 18-tube furnaces, etc. The width (or diameter) of a single furnace tube in a multi-tube furnace is small, generally less than 200mm, while the furnace tubes in a single-tube, double-tube, and four-tube furnace are much wider, generally greater than 300mm. Multi-tube furnaces are generally used for the reduction of tungsten powde...

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Problems solved by technology

However, these patents are limited to the treatment of hydrogen, and do not involve the hydrogen intake system and return gas system of the reduction furnace itself, and these patented technologies are all for the recovery of hydrogen in the tungsten powder and molybdenum powder industries, that is, in the multi-tube furnace Hydrogen recovery is realized on the multi-tube furnace, and hydrogen recovery is easy to realize on the multi-tube furnace because each furnace door in the multi-tube furnace is opened in turn, that is to say, only one furnace door is opened at the same time, and because the multi-tube furnace has many furnace tubes, Opening a furnace door has almost no effect on the total intake hydrogen flow and return hydrogen flow, but for single-tube furnaces, double-tube furnaces and four-tube furnaces, it is very different from multi-tube furnaces, and the size of the furnace tubes Larger, that is, when the furnace door is opened, hydrogen overflows from the furnace mouth, resulting in a large loss of hydrogen, the pressure difference between the furnace tube and the atmospheric pressure is almost zero or unstable, and hydrogen cannot enter the recovery system, resulting in the interruption of the recovery system

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