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Waste heat recovery device of gas-based shaft kiln and gas-based shaft kiln

A technology of waste heat recovery device and gas-based shaft furnace, which is applied to shaft furnaces, furnaces, furnace types, etc. Oxidized pellet flow and other problems, to achieve the effect of improving energy utilization, improving heat exchange efficiency and service life, and improving fluency

Pending Publication Date: 2017-06-09
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the falling process of the oxidized pellets, the heat exchange tubes extending in the horizontal direction hinder the oxidized pellets, which is not conducive to the flow of the oxidized pellets.
Moreover, dust is easy to accumulate above the heat exchange tubes, which affects the heat exchange between the top gas and the oxidized pellets
In addition, the high-temperature top gas discharged from the furnace body contains a large amount of dust and impurities, and the deposition of dust in the heat exchange tube affects the heat exchange efficiency and service life of the waste heat recovery device

Method used

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  • Waste heat recovery device of gas-based shaft kiln and gas-based shaft kiln
  • Waste heat recovery device of gas-based shaft kiln and gas-based shaft kiln
  • Waste heat recovery device of gas-based shaft kiln and gas-based shaft kiln

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Effect test

Embodiment 1

[0061] like figure 1 As shown, the gas-based shaft furnace 500 includes a furnace body 510 and a material bin 520. The furnace body 510 is used for metal smelting. The material bin 520 can add heat source materials to the furnace body 510. For example, the materials can be oxidized pellets, etc., for Provides heat during metal smelting. It can be understood that during the metal smelting process, the top gas generated has a relatively high temperature, and the temperature of the top gas discharged from the exhaust port 511 is about 450°C.

[0062] The waste heat recovery device 100 can recover and utilize the heat of the high-temperature top gas exhausted by the gas-based shaft furnace 500, so as to improve energy utilization rate, save energy and protect the environment. like figure 1 and figure 2 As shown, the waste heat recovery device 100 includes: a heat exchange chamber 10 , a dust discharge device 20 and a gas channel 140 .

[0063] Among them, such as figure 1 As...

Embodiment 2

[0075] The difference from the first embodiment is that in this embodiment, the high-temperature top gas flows into the heat exchange chamber 10 at a flow rate of 568767Nm3 / h. There are 40 layers of U-shaped sections 150 arranged at intervals along the vertical direction in the feed chamber 130 , and in the same layer, the distance between two adjacent straight pipe sections 152 is L1, L1=100mm. Among the two adjacent layers of U-shaped sections 150 , the distance between the straight pipe section 152 of one layer and the adjacent straight pipe section 152 of the other layer is L2, and L2=100mm. The temperature field distribution of each area in the heat exchange chamber 10 is as follows: at the bottom of the feeding chamber 130, the temperature is 443°C-446°C; in the middle of the feeding chamber 130, the temperature is 360°C-375°C; , the temperature is 111°C-125°C. The temperature of the dispersion zone 160 is 25°C, and the temperature of the discharge zone 170 is 443°C.

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Abstract

The invention discloses a waste heat recovery device of an air-based shaft furnace and an air-based shaft furnace. A heat exchange chamber is provided with a material passing chamber, which is connected to a material inlet and a material outlet respectively. The gas channel is set in the feeding chamber, and the two ends of the gas channel are respectively connected with the furnace top gas inlet and the furnace top gas outlet. The U-shaped section includes a curved pipe section and two straight pipe sections. The pipe section is connected, and the cross-sectional outline of the straight pipe section includes the upper straight section and the lower arc section. According to the waste heat recovery device of the present invention, the high-temperature furnace top gas in the gas passage can be used to preheat the materials in the material passing chamber. Moreover, by arranging the straight pipe section of the gas passage as a pipe shape with an upper straight section and a lower arc section, the gas passage can have the function of dividing materials and reduce the obstruction of the gas passage to the flow of materials. Moreover, it can also prevent the heat exchange between the furnace top gas and the material from being accumulated in a large amount on the upper pipe section of the gas passage during the falling process of the material.

Description

technical field [0001] The invention relates to the technical field of metal smelting, in particular to a waste heat recovery device for a gas-based shaft furnace and the gas-based shaft furnace. Background technique [0002] The gas-based shaft furnace is the main reactor for reducing iron, and it is also a commonly used reactor in the pre-reduction stage of the smelting reduction process. The heat source in the shaft furnace mainly comes from the sensible heat of fresh gas. In order to meet the needs of heating, a large amount of fresh gas must be fed into the shaft furnace. The temperature of the furnace top gas is about 450°C, and about 40% of the energy is taken away by the top gas. The heat loss is relatively large. [0003] In related technologies, the treatment and utilization methods of furnace top gas mainly include: after washing and pressure treatment, it is used as cooling gas for the cooling section of the lower part of the shaft furnace. After the cooling pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/02
CPCC21B13/023
Inventor 冯鲁兴邓君唐敬坤韩志彪曹志成汪勤亚吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST