Energy-saving roller-hearth continuous kiln waste heat boiler

Abstract

The invention discloses an energy-saving roller-hearth continuous kiln waste heat boiler, which comprises a smoke pipe 1, a drum 2, heat exchange tubes 3, down pipes 4 and header pipes 5, wherein the smoke pipe 1 is positioned in the drum 2; the heat exchange tubes 3 have an L shape so as to be close to a steel pipe as much as possible; the lower parts of the heat exchange tubes 3 are respectively connected with the left and right header pipes 5, and the upper parts of the heat exchange tubes 3 are connected with the drum 2; the lower parts of the down pipes 4 are respectively connected with the left and right header pipes 5, and the upper parts of the down pipes 4 are connected with the drum 2; and thermal insulating layers 6 are arranged on the outer sides of the drum 2 and the heat exchange tubes 3 and at the peripheries of the down pipes 4 and the header pipes 5. Two kinds of heat energy, namely high-temperature smoke heat energy and radiating heat energy of the steel pipe, can be simultaneously exchanged into steam to serve as steam for production of the steel pipes and domestic steam; and moreover, the tapping temperature of the steel pipe is reduced, the secondary oxidation loss is reduced, and the outer surface quality of a product is improved.

Description

technical field [0001] The invention relates to a heat treatment furnace, in particular to an energy-saving roller bottom continuous kiln waste heat boiler. Background technique [0002] The existing steel pipe, steel plate and strip steel and other products, the roller bottom continuous annealing furnace used in the production process includes a heating room, a heat preservation room and a furnace roll, the heating room and the heat preservation room are connected, and the furnace roll passes through the bearing seat outside the furnace wall It is installed in the heating room and the heat preservation room. The upper part of the furnace wall is the furnace roof, the lower part is the furnace bottom, and there is a flue at the end of the heat preservation room. In the roller hearth continuous annealing furnace, steel pipes, steel plates and strip steel products are rapidly heated at high temperature in the heating room and kept warm in the holding room, and then they are d...

AI Technical Summary

Problems solved by technology

Its disadvantages are: the temperature of steel pipes, steel plates and strip steel products directly out of the furnace after annealing or normalizing is as high as 800°C, resulting in a large amount of high-temperature heat energy being released in the atmosphere, resulting in poor working conditions for annealing workers; at the same time, When products such as steel pipes, steel plates, and strip steel are annealed at about 800°C and air-cooled, the iron in the surface layer will chemically react with oxidizing gases (such as oxygen and water vapor) in the air to produce secondary oxidation. After the secondary oxidation of products such as steel plates, steel strips, etc., a thick layer of secondary oxide scale is formed on the surface, which affects the pickling speed of steel pipes, steel plates, and strip steel products, and increases the consumption of sulfuric acid during pickling; if When the finished steel pipe, steel plate and strip steel are annealed, the secondary oxide scale is thicker, which will not only cause the loss of steel, but also reduce the outer surface quality of steel pipe, steel plate and strip steel.

[0003] In addition, most of the high-temperature flue gas in the annealing furnace in the prior art uses an air heat exchanger for waste heat utilization, but the heat exchange effect of the air heat exchanger is poor, and it can only reduce the high-temperature flue gas at about 750°C to 500°C. ℃, there is still a large amount of heat energy in the flue gas that has not been fully utilized, and steel pipes, steel plates, and strip steel products need steam heating in the production process, and it takes a lot of energy to generate steam through coal (gas) boilers. Energy, which is not conducive to enterprises to reduce production costs and wastes national energy resources, but also causes environmental pollution and deteriorates the working conditions of workers

Images