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Waste-heat utilization method and device for indirect heating type sintering system

A heating and indirect technology, applied in the field of alumina production, can solve the problems of increasing energy consumption and production cost of the production system, difficulty in meeting emission standards, and low heat exchange efficiency, so as to facilitate dust collection and emission treatment, and reduce equipment investment , Reduce the effect of heating temperature difference

Active Publication Date: 2016-04-13
SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heat exchange efficiency of this heating method is low, and a large amount of high-temperature combustion flue gas and exhaust gas in the kiln will be generated. If the waste heat is not recovered, a large amount of energy will be wasted, and the energy consumption and production cost of the entire production system will be increased. ; At the same time, if the above-mentioned flue gas or tail gas is not cooled, it will also cause difficulties in meeting the emission standards.

Method used

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  • Waste-heat utilization method and device for indirect heating type sintering system
  • Waste-heat utilization method and device for indirect heating type sintering system

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Experimental program
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Effect test

Embodiment 1

[0045] Such as figure 1 As shown, the waste heat utilization device of the indirect heating sintering system in this embodiment mainly includes: kiln 11, combustion chamber 12, air-water heat exchanger 13, raw meal preheater 14, flash evaporator 15, saturated water circulation pump 16, etc. The specific structure is as follows:

[0046] The combustion chamber 12 is located on the outside of the kiln 11, and indirectly heats the materials in the kiln (rotary kiln or vertical furnace), and the outlet of the combustion flue gas is connected to the air-water heat exchanger 13 through a pipeline; the air-water heat exchanger 13 is set There are low-temperature water inlet and saturated water outlet, and the saturated water outlet is connected to the flash evaporator 15 through pipelines, and the saturated steam generated then goes to other processes through the saturated steam outlet of the flash evaporator 15 through pipelines; the inlet port of the saturated water circulation pum...

Embodiment 2

[0050] Such as figure 2 As shown, the waste heat utilization device of the indirect heating sintering system in this embodiment mainly includes a first-stage kiln 21, a second-stage kiln 22, a first-stage combustion chamber 23, a second-stage combustion chamber 24, an air-water heat exchanger 25, and raw meal preheating 26, gas heat exchanger 27 (air or gas), flash evaporator 28, saturated water circulation pump 29, etc., the specific structure is as follows:

[0051] The first-stage combustion chamber 23 and the second-stage combustion chamber 24 are respectively located outside the first-stage kiln 21 and the second-stage kiln 22, and indirectly heat the materials in the kiln (first-stage kiln 21, second-stage kiln 22), and the combustion flue gas (one-stage combustion chamber flue gas, second-stage combustion chamber flue gas) are respectively connected to the gas-water heat exchanger 25 through pipelines, and the gas-water heat exchanger 25 divides a branch pipeline and i...

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Abstract

The invention belongs to the field of production of aluminum oxide, and particularly relates to a waste-heat utilization method and device for an indirect heating type sintering system. The device comprises a combustor, a raw material preheater, a gas-gas heat exchanger, gas-water heat exchangers, a flash evaporator, a saturated water circulating pump and pipelines used for enabling the devices to communicate with each other. High-temperature flue gas exhausted by the combustor is used to heat low-temperature water by the aid of the gas-water heat exchangers; saturated steam of 0.1MPa-8.6MPa is obtained, and the flue gas emission temperature is reduced; at the same time, the high-temperature flue gas can be used together with high-temperature tail gas generated in a kiln for preheating raw materials entering the kiln; and the high-temperature flue gas can also be used together with the high-temperature tail gas generated in the kiln for preheating combustion-supporting air or a gas fuel required by the combustor. According to the device and the method, part of the heat of the combustion flue gas and the tail gas in the kiln can be recovered effectively; saturated steam is obtainedand supplied for the whole factory; the energy utilization efficiency of the whole sintering system is improved; the production cost is reduced; and at the same time, the temperature of the flue gas or the tail gas can also be reduced, and dust collection treatment and discharging are facilitated.

Description

technical field [0001] The invention belongs to the field of alumina production, in particular to a waste heat utilization method and device of an indirect heating sintering system. Background technique [0002] In the production of alumina and other industrial production processes, under certain specific technical requirements, it is necessary to use an indirect heating sintering system to heat the material. This heating system can ensure that the heated material is in a closed space. Free from contamination by foreign impurities. However, the heat exchange efficiency of this heating method is low, and a large amount of high-temperature combustion flue gas and exhaust gas in the kiln will be generated. If the waste heat is not recovered, a large amount of energy will be wasted, and the energy consumption and production cost of the entire production system will be increased. ; At the same time, if the above-mentioned flue gas or tail gas is not cooled, it will also cause di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D17/00
CPCY02P10/25
Inventor 张文李志国廖新勤
Owner SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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