Since the preheating furnace has been put into use, a total of 8 equipment abnormal accidents have occurred during the operation period, as follows. (1) The outlet flange of the radiant section of the preheating furnace leaks, and the gaskets and bolts are replaced when the vehicle is stopped. Reason analysis: The installation quality is the problem, the bolt selection is wrong. (2) Cracks appear in the welding seam of the header header at the outlet of the radiant section, stop for repair welding. Reason analysis: The welding quality of the header manufacturing is unqualified. (3) The boiler water heat exchange tube in the convection section of the preheating furnace leaked. Due to the difficulty of repair and construction, it was decided to short-circuit the boiler feed water pipe from the outside of the furnace after research at the special meeting, and the inlet and outlet headers of the boiler feed water were blocked. Reason analysis: The manufacturing quality of the boiler water heat exchange tube in the convection section is poor. (4) Leakage occurs in the fillet weld between the outlet header of the radiant section and the coil, and the system is shut down to repair the leak. Reason analysis: The original design and welding process of the welding structure of the outlet pipe of the radiant coil and the header are not perfect; the fillet weld has the problem of insufficient fillet height and incomplete penetration. (5) Leakage occurred again at the fillet weld between the outlet header of the radiant section and the coil, and the header was stopped for renovation and replacement, which completely solved the defects in the design. (6) Crack leakage of the paired flange at the outlet of the radiation section header. Reason analysis: There is a misalignment between the matching flange and the pipeline in the original installation process, and the thermal expansion stress of the pipeline is concentrated in the transition area of ​​the high neck of the flange, and cracks are generated due to excessive stress during operation. Further inspection found that there was a crack at the high neck of the header flange, and the header flange and mating flange were replaced.

The hot furnace preheating furnace is a kind of low-quality fuel (mainly refers to blast furnace gas, hot gas, tail gas and other low-calorific value fuel) or air, through a heat exchanger, in the high-temperature flue gas of the heating furnace. Or the air temperature increases, generally to 300-900 degrees. Thereby, the actual combustion temperature of the inferior fuel or the sensible heat of the air is increased, and high-temperature calcination or other processes of the inferior fuel are achieved, thereby replacing the superior fuel. The substitution of low-quality fuels for high-quality fuels is realized, thereby greatly saving fuel costs. At the same time, it also reduces the emission of low-quality fuel or exhaust gas and reduces pollution. It is a very energy-saving and environmentally friendly new process and new technology. The 200 kt/a methanol plant preheating furnace was originally designed as a vertical cylindrical tube furnace. The radiant section preheats the steam and coke oven gas entering the reformer, and the convection section preheats the oxygen and steam entering the reformer. In order to meet the reaction conditions of the reformer; the boiler water is preheated in the upper part of the convection section to recover the waste heat of the flue gas. It can be seen that the preheating furnace is an important equipment in the methanol plant. In the event of a failure, the conversion system and even the entire methanol plant must be shut down urgently, and its normal operation will directly affect the safe and stable operation of the methanol plant [1] .

【use】 Step-by-step sintering machine is the main equipment in metallurgical sintering operation. It is used to sinter concentrate minerals, rich ore powder and other raw materials of different composition and particle size into blocks for blast furnace ironmaking. 【component】 Step-by-step plane sintering machine consists of sintering trolley, hydraulic cart, mixing hopper, bottom material device, bellows, sealing device at both ends, front ferry, tail ferry, igniter, carriage return mechanism, winch transmission device , dry oil lubrication device, etc. 【Main structural features】 The stepping plane sintering machine adopts some mature belt sintering machine equipment (including cooling, and other cooling methods can also be used), and the sintering machine can be circulated in a rectangular plane through the link, without the complicated transmission of the belt sintering machine. The device and higher operating platform have the characteristics of low investment and short construction period, which can reach the same sintering device of the belt sintering machine, close to the automation control degree and environmental protection requirements of the belt sintering machine. 【Technical performance parameter table】

【use】 Belt sintering machine is the main equipment in metallurgical sintering operation. It is used to sinter concentrate powder, rich ore powder and other raw materials of different composition and particle size into blocks for blast furnace ironmaking. 【component】