Braze welding heating furnace of aluminum alloy plate-fin heat exchanger and heating partitioning and control methods

Abstract

The invention discloses a braze welding heating furnace of an aluminum alloy plate-fin heat exchanger and heating partitioning and control methods. The braze welding heating furnace comprises a horizontal furnace body, wherein a support for placing a workpiece to be brazed is arranged in the furnace body, and a heating device is also arranged in the furnace body and comprises at least four heating areas which are arranged around the position of the workpiece to be brazed in the furnace body. The heating partitioning method comprises the following steps of: partitioning the heating areas on left and right sides of a heating space into upper subareas, middle subareas, lower subareas and eight loops for control, wherein totally 48 heaters are arranged on two side surfaces; and partitioning the heating areas on the top and at the bottom into eight loops according to an eight-loop partitioning mode for control, wherein in one subarea, totally 16 heaters are arranged on the top and at the bottom; and the heating control method comprises the following steps of: dividing the braze welding into three major stages, and subdividing the major stages into thirteen small stages, wherein the first stage belongs to baking and is started from normal temperature until the central temperature of the workpiece is 650 Fahrenheit degrees, the second stage is performed until the central temperature of the workpiece is 1,000 Fahrenheit degrees, and the third stage is performed until the central temperature of the workpiece meets a technological requirement. The braze welding heating furnace has the characteristics of energy saving, high performance and capability of realizing automatic braze welding of a large-volume plate-fin heat exchanger, and has excellent control performance.

Description

technical field [0001] The invention relates to a brazing heating furnace for an aluminum alloy plate-fin heat exchanger, a heating zone and a control method, and belongs to the technical field of vacuum automatic brazing of large-scale aluminum plate-fin heat exchangers. Background technique [0002] During the "Eleventh Five-Year Plan" period, the country realized "four major start-ups", namely coal-to-oil, coal gasification combined power generation (IGCC), liquefied natural gas (LNG) receiving station and smelting reduction ironmaking. Coal gasification projects will be the potential customers with the largest oxygen consumption in the future, and synthetic oil (indirect liquefaction) projects will be the most. A 5 million / a synthetic oil factory needs 1.2 million to 1.3 million m 3 The amount of oxygen per hour; a coal chemical project with 1 million methanol per year requires about 120,000 m of oxygen 3 / h; 400MW IGCC power generation project requires 70,000 m of...

AI Technical Summary

Problems solved by technology

At the same time, each large-scale air separation unit requires a large number of heat exchangers. If manual brazing is relied on, the product quality will fluctuate greatly and the energy consumption will be high.

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