Staged-combustion system of suspension roaster and application thereof

A suspension roasting furnace and staged combustion technology, applied in the roasting field, can solve the problems of large amount of high-temperature pollutants and insufficient fuel combustion, and achieve the effects of prolonging residence time, high fuel utilization rate, and sufficient fuel combustion

Pending Publication Date: 2018-01-09
KEDA MAS CLEAN ENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of insufficient fuel combustion and large amount of high-temperature pollutants in the combustion process of the existing suspension roaster, the present invention provides a staged combustion system of the suspension roaster and its application

Method used

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  • Staged-combustion system of suspension roaster and application thereof
  • Staged-combustion system of suspension roaster and application thereof
  • Staged-combustion system of suspension roaster and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Such as figure 1 with figure 2 As shown, a suspension roaster staged combustion system includes main roaster PO4, main combustion pipe 4, gas-supporting pipe 2, primary burner 1 and secondary burner 3, said main roaster PO4, said main combustion The tube 4 and the gas-supporting tube 2 are connected sequentially, the primary burner 1 communicates with the bottom of the main combustion tube 4, and the central axis of the primary burner 1 coincides with the central axis of the primary combustion tube 4 , the secondary burner 3 is arranged on the main combustion pipe 4 along the circumferential direction and communicates with the main combustion pipe 4 .

[0043] The burners in the prior art are generally arranged on the gas-supporting pipeline connected with the PO4 of the main roaster, and the gas jet flow ejected from the burner can only enter the main gas flow of the supporting gas from the edge, so most of the gas can only be connected with the auxiliary gas at the ...

Embodiment 2

[0046] Such as figure 1 with figure 2 As shown, a suspension roasting furnace graded combustion system, its structure is compared with embodiment 1, the difference is: in order to make the gas that secondary burner 3 ejects to the impact disturbance of main combustion gas main flow in main combustion tube 4 maximum , the residence time in the main combustion tube 4 is also relatively long, and the secondary burner 3 is set in such a way that the central axis of the secondary burner 3 is perpendicular to the central axis of the main combustion tube 4. This arrangement In this way, the mixing effect of the gas ejected from the secondary burner 3 and the assisted gas at the edge of the main airflow is also better.

Embodiment 3

[0048] Such as figure 1 , figure 2 with image 3 As shown, a suspension roaster staged combustion system, its structure compared with embodiment 1, the difference is: the number of the secondary burner 3 is at least two, and evenly arranged in the main combustion tube 4 On the outer wall, the jet flow direction at the outlet of the secondary burner 3 forms a tangential circle. In actual application, the number of the secondary burner 3 can be two, three, four, five, six, etc., in this implementation In the example, four secondary burners 3 are set, and the outlet jet directions of the four secondary burners 3 form a tangential circle, and the gas is injected through the secondary burners 3 and is discharged in the main A swirling flow is formed in the combustion tube 4, and the gas in the swirl state helps to prolong the residence time of the gas in the main combustion tube 4 on the one hand, and also strengthens the disturbance between the gas and the supporting gas on the...

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Abstract

The invention discloses a staged-combustion system of a suspension roaster and an application thereof, belonging to the field of roasting. The staged-combustion system comprises a main roaster PO4, amain combustion pipe, an auxiliary gas pipe, a first-stage combustor and a second-stage combustor, wherein the main roaster PO4, the main combustion pipe and the auxiliary gas pipe are connected in sequence; the first-stage combustor is connected to the bottom of the main combustion pipe; the central axis of the first-stage combustor and the central axis of the main combustion pipe coincide; and the second-stage combustor is arranged on the main combustion pipe along a periphery direction and is connected to the main combustion pipe. The staged-combustion system solves the problems existing ina tradition suspension roaster that the insufficient mixing of gas and combustion-supporting gas causes the insufficient combustion of fuel, low utilization rate of fuel and formation of a large amount of high-temperature pollutants, and material dropping causes the flameout of the combustors and the instability of the combustion system. The staged-combustion system has the characteristics of high efficiency, stability and low emission load of pollutants.

Description

technical field [0001] The invention belongs to the field of roasting, and more specifically relates to a staged combustion system of a suspension roasting furnace and its application. Background technique [0002] Suspension roasting furnace is mainly used for roasting aluminum hydroxide in the aluminum industry. Its purpose is to remove crystal water and combined water in aluminum hydroxide, and at the same time complete the crystal phase transformation to generate α-alumina suitable for electrolytic aluminum. In recent years, the suspension roasting furnace has been rapidly promoted and applied in the aluminum industry due to its advantages of high output and low energy consumption, and has become the main furnace type for alumina roasting in the aluminum industry. However, with the increasingly severe situation of energy and environmental protection, the disadvantages of high pollution and low fuel utilization rate in the production process of suspension roaster are grad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D14/04F23D14/64F23D14/58
Inventor 胡振中秦亚杰毕大鹏李金超
Owner KEDA MAS CLEAN ENERGY
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