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Method for converting to hot air from flue gas in baking furnace

A roasting furnace, hot air technology, applied in heat exchanger types, direct contact heat exchangers, furnaces, etc., can solve problems such as ineffective utilization of waste heat resources, waste heat waste, and reduction in the amount of coal-fired supplements, to reduce The effect of coal-fired supplementary amount, energy saving, and meeting the needs of flue gas treatment process

Active Publication Date: 2007-12-26
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for converting flue gas of a roasting furnace into hot air, and the obtained hot air is recycled as a hot air source of the roasting furnace, which solves the problem that waste heat resources cannot be effectively utilized, thereby saving energy and reducing production costs
[0005] The technical solution of the present invention is: the hot flue gas of the roasting furnace is converted into hot air, which can well solve the problem of a large amount of waste heat being wasted, especially in the raw ore boiling roasting project. Due to the thermal imbalance of the roasting material, additional energy is needed to supplement the heat. , the hot flue gas can be converted into hot air and used as the hot air source of the fluidized roaster to supply the roaster, thereby reducing the additional amount of coal burning. Therefore, without additional investment, a large amount of energy is saved and production is reduced. cost, improve the economic efficiency of the enterprise

Method used

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  • Method for converting to hot air from flue gas in baking furnace

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Effect test

Embodiment 1

[0017] As shown in accompanying drawing 1, concrete steps of the present invention are as follows:

[0018] Step 1: Hot flue gas is introduced into the heat exchanger

[0019] The temperature of the hot flue gas 1 produced by the roasting furnace is 680°C, and the flue gas volume is 30,000m 3 / h, the hot flue gas 1 is introduced from the bottom of the heat exchanger 2 under the action of a high-temperature induced draft fan, and the dust contained in the hot flue gas is returned to the roasting system through the gravity settling chamber and the overflow screw 3;

[0020] Step 2: Cool air is fed into the heat exchanger

[0021] The temperature of the cold air 4 supplied to the heat exchanger is 20°C, and the supply volume of the cold air is 28000m 3 / h, the cold air 4 is fed from the upper part of the heat exchanger, and forms a three-stage countercurrent heat exchange form with the hot flue gas for heat exchange;

[0022] Step 3: Heat Exchange

[0023] The hot flue gas 1 ...

Embodiment 2

[0026] As shown in accompanying drawing 1, concrete steps of the present invention are as follows:

[0027] Step 1: Hot flue gas is introduced into the heat exchanger

[0028] The temperature of the hot flue gas 1 produced by the roasting furnace is 700°C, and the flue gas volume is 32000m 3 / h, the hot flue gas 1 is introduced from the bottom of the heat exchanger 2 under the action of a high-temperature induced draft fan, and the dust contained in the hot flue gas is returned to the roasting system through the gravity settling chamber and the overflow screw 3;

[0029] Step 2: Cool air is fed into the heat exchanger

[0030] The temperature of the cold air 4 supplied to the heat exchanger is 20°C, and the supply volume of the cold air is 30000m 3 / h, the cold air 4 is fed from the upper part of the heat exchanger, and forms a three-stage countercurrent heat exchange form with the hot flue gas for heat exchange;

[0031] Step 3: Heat Exchange

[0032] The hot flue gas 1 i...

Embodiment 3

[0035] As shown in accompanying drawing 1, concrete steps of the present invention are as follows:

[0036] Step 1: Hot flue gas is introduced into the heat exchanger

[0037] The temperature of the hot flue gas 1 produced by the roasting furnace is 720°C, and the flue gas volume is 33000m 3 / h, the hot flue gas 1 is introduced from the bottom of the heat exchanger 2 under the action of a high-temperature induced draft fan, and the dust contained in the hot flue gas is returned to the roasting system through the gravity settling chamber and the overflow screw 3;

[0038] Step 2: Cool air is fed into the heat exchanger

[0039] The temperature of the cold air 4 supplied to the heat exchanger is 20°C, and the supply volume of the cold air is 30500m 3 / h, the cold air 4 is fed from the upper part of the heat exchanger, and forms a three-stage countercurrent heat exchange form with the hot flue gas for heat exchange;

[0040] Step 3: Heat Exchange

[0041] The hot flue gas 1 i...

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Abstract

This invention relates to a method for converting smoke of calcining furnaces into hot air including: leading smoke into a heat exchanger and feeding cold air into it for heat exchange to reduce the temperature of the smoke to 350-400deg.C from 600-750deg.C and rise the cold air from 20deg.C under natural condition to 300-400deg.C, which is advantaged that a gas- heat exchanger is used to convert waste heat of baked smoke to hot air for reusing so as to fully utilize the waste heat resource and save cost of production.

Description

technical field [0001] The invention relates to a method for utilizing waste heat, in particular to a method for converting flue gas of a roasting furnace into hot air. Background technique [0002] As we all know, the hot flue gas generated during the roasting process has certain requirements on the temperature of the flue gas in the subsequent process, so the hot flue gas is usually cooled to meet the recovery and treatment requirements of the subsequent process; however, the heat generated by different roasting processes Flue gas, due to the different properties of flue gas, the recovery and treatment process is also different. For example, high-arsenic flue gas must meet the requirements of dust recovery and arsenic recovery. In order to prevent the formation of glass arsenic, the temperature must be dropped sharply when recovering arsenic. , so the cooling method will be significantly different; [0003] Under normal circumstances, there are roughly the following metho...

Claims

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Application Information

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IPC IPC(8): F28C3/12F27D17/00
Inventor 张清波汪丹鲁玉春谷志君
Owner CHANGCHUN GOLD RES INST
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