Self-decomposing ammonia sintering furnace and its control method

Abstract

Self-decomposing ammonia sintering furnace, including the base of the sintering equipment. The base of the sintering equipment is equipped with a mesh belt input part, a sintering main part, a cooling part and a mesh belt conveying part, and the conveying mesh belt passes through the middle of the sintering main part and the cooling part. , and one end is set on the input part of the mesh belt, and the other end is set on the conveying part of the mesh belt; the electric heating part is installed in the sintering main part, and an ammonia heating pipe is arranged in the sintering main part and the periphery of the electric heating part, The liquid ammonia is transported to the ammonia heating pipeline through the ammonia heating input pipeline, and the waste heat of the sintering furnace is used to realize self-decomposition, which can effectively reduce the power consumption required for electric heating and decomposition. The PID control system automatically switches between high and low according to the real-time detection value transmitted by the digital temperature sensor Level to control the conduction and disconnection of the thyristor of the relay, determine the heating time of the electric heating part, and have a small impact on the power grid, which not only improves the economic benefits of the system, but also prolongs the service life of the boiler.

Description

technical field [0001] The invention relates to the technical field of sintering devices, in particular to a self-decomposing ammonia sintering furnace and a control method thereof. Background technique [0002] In the production of powder metallurgy parts, sintering is the key process to determine the microstructure, mechanical properties and size control of the final product. At high temperature, the solid particles of the green body are bonded to each other, the crystals grow gradually, and the pores and grain boundaries gradually decrease. , and finally become a dense polycrystalline sintered body with a certain microstructure. In modern sintering process equipment, nitrogen-based atmosphere gas is mostly used as sintering protection gas, and nitrogen-based atmosphere gas is mostly transformed from ammonia decomposition. At present, ammonia decomposition mainly uses a separate decomposition equipment, which is decomposed and purified and transported to sintering equipmen...

AI Technical Summary

Problems solved by technology

At present, the control of high-temperature sintering furnaces in China mainly adopts on-off control, or even manual control. The system stability using these two types of control methods is not good, and the overshoot is large. At the same time, the response to external environment changes is slow, and the real-time performance is poor.

In addition, frequent switching has a great impact on the power grid, which not only reduces the economic benefits of the system, but also reduces the service life of the boiler

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