CN-115371451-B - Waste heat utilization method and system of open ring type roasting furnace

CN115371451BCN 115371451 BCN115371451 BCN 115371451BCN-115371451-B

Abstract

The invention relates to a waste heat utilization method and a system, in particular to a waste heat utilization method and a system applied to an open ring type roasting furnace for producing aluminum anodes, cathodes, electrodes and carbon graphitization materials in the carbon industry. 150-200 ℃ medium-temperature flue gas collected in a centralized way in a forced cooling area of the open ring type roasting furnace is guided to an adjacent raw block warehouse of a roasting workshop for heating through an air guiding frame and a main pipeline when heating is needed, and 150-200 ℃ medium-temperature flue gas collected in a centralized way in the forced cooling area of the open ring type roasting furnace is guided to a low-temperature waste heat boiler for producing 40-60 ℃ medium-temperature hot water for plant use through the air guiding frame and the main pipeline when heating is not needed. The invention has the advantages that the problem that the failure of the multifunctional vehicle is influenced because the environment temperature of the workshop is too high due to the fact that the flue gas is directly discharged to the workshop is solved, the flue gas discharged from the forced cooling area of the roasting furnace is collected intensively, the heat of the flue gas is utilized to the maximum extent, and the effects of energy conservation and consumption reduction are achieved.

Inventors

ZHOU SHANHONG
LIU CHAO
JIANG KAI

Assignees

沈阳铝镁设计研究院有限公司

Dates

Publication Date: 20260512
Application Date: 20220825

Claims (3)

1. The waste heat utilization system of the open ring type roasting furnace is characterized by comprising an open ring type roasting furnace, wherein the open ring type roasting furnace is arranged in a roasting workshop, a raw block warehouse is adjacent to the roasting workshop, medium-temperature flue gas of a forced cooling area of the open ring type roasting furnace is introduced into a main pipeline fixed on a furnace surface through an induced air frame, the main pipeline is connected with a branch pipeline I and a branch pipeline II, the branch pipeline I enters the raw block warehouse and is connected with a radiator in the raw block warehouse, the tail end of the branch pipeline I is connected with an outdoor fan, and the branch pipeline II is connected with the outdoor fan after being connected with a low-temperature waste heat boiler arranged in the roasting workshop; when heating is needed, 150-200 ℃ medium-temperature flue gas collected in the forced cooling area of the open ring type roasting furnace is guided to an adjacent raw block warehouse of a roasting workshop through an air guiding frame and a main pipeline for heating, when heating is not needed, 150-200 ℃ medium-temperature flue gas collected in the forced cooling area of the open ring type roasting furnace is guided to a low-temperature waste heat boiler through the air guiding frame and the main pipeline for producing 40-60 ℃ medium-temperature hot water for plant use, the main pipeline is fixedly arranged in the middle area of the furnace surface of the open ring type roasting furnace, a rising pipeline is arranged on the main pipeline and connected with the air guiding frame, branch pipeline butterfly valves are arranged at the inlets of the branch pipelines I and II for controlling the flow direction of the medium-temperature flue gas, the number of the rising pipelines is half of the number of the furnace chambers of the open ring type roasting furnace, the opposite furnace chambers share one rising pipeline, and the rising pipeline is arranged between the rising pipeline and the main pipeline, the branch pipeline I enters the raw block warehouse and surrounds the raw block warehouse for a circle, and a certain number of radiators are arranged on the first branch pipeline for heating by using heat in the flue gas.
2. The waste heat utilization system of an open ring roasting furnace according to claim 1, wherein the fan is connected with a flue gas outlet pipeline.
3. The system for utilizing waste heat of an open ring roasting furnace according to claim 1, wherein the main pipe, the branch pipe I and the branch pipe II are subjected to heat preservation treatment.

Description

Waste heat utilization method and system of open ring type roasting furnace Technical Field The invention relates to a waste heat utilization method and a system, in particular to a waste heat utilization method and a system applied to an open ring type roasting furnace for producing aluminum anodes, cathodes, electrodes and carbon graphitization materials in the carbon industry. Background In recent years, the electrolytic aluminum industry is vigorously developed, the driven prebaked anode industry is also rapidly developed, and the prebaked anode is gradually formed in a large scale from the previous 10 ten thousand tons to the current 30 ten thousand tons. As the last procedure of prebaked anode, the roasting furnace is gradually enlarged, and the problem is that the environment temperature in the workshop is too high, which affects the normal operation of the multifunctional crown block. The traditional roasting process adopts a blast frame to forcedly cool the high-temperature carbon block, and the principle is that in a roasting forcedly cooling area, the heat of the high-temperature carbon block is exchanged by blowing normal-temperature air, but the high-temperature air (the temperature is 150-200 ℃) after heat exchange is directly discharged to a workshop through a flame path fire hole, so that the environment temperature of the workshop is overhigh, and even 70 ℃ high temperature of a crown block area occurs in Xinjiang area, so that the production is seriously influenced. Therefore, the induced draft forced cooling process is applied to the roasting process, on one hand, the problem of secondary oxidization of carbon blocks is solved, on the other hand, the problem of workshop environment can be reduced, and meanwhile, the recovery of heat of medium-temperature flue gas becomes possible. Disclosure of Invention The invention aims to solve the technical problems and provide a waste heat utilization method and a waste heat utilization system, which aim to realize the maximum utilization of heat in the medium-temperature flue gas collected in a centralized way and achieve the effects of energy conservation and consumption reduction. In order to achieve the purpose, the waste heat utilization method for the open ring type roasting furnace is characterized in that 150-200 ℃ medium temperature flue gas collected in a centralized manner in a forced cooling area of the open ring type roasting furnace is guided to an adjacent raw block warehouse of a roasting workshop through an air inducing frame and a main pipeline for heating when heating is needed, and 150-200 ℃ medium temperature flue gas collected in a centralized manner in the forced cooling area of the open ring type roasting furnace is guided to a low-temperature waste heat boiler through the air inducing frame and the main pipeline for producing 40-60 ℃ medium temperature hot water for plant area use when heating is not needed. The waste heat utilization system of the open ring type roasting furnace comprises the open ring type roasting furnace, wherein the open ring type roasting furnace is arranged in a roasting workshop, a raw block warehouse is adjacent to the roasting workshop, medium-temperature flue gas in a forced cooling area of the open ring type roasting furnace is introduced into a main pipeline fixed on a furnace surface through an induced air frame, the main pipeline is connected with a branch pipeline I and a branch pipeline II respectively, the branch pipeline I enters the raw block warehouse and is connected with a radiator in the raw block warehouse, the tail end of the branch pipeline I is connected with an outdoor fan, and the branch pipeline II is connected with the outdoor fan after being connected with a low-temperature waste heat boiler arranged in the roasting workshop. The main pipeline is fixedly arranged in the middle area of the furnace surface of the open ring type roasting furnace, the main pipeline is provided with a rising pipeline, the rising pipeline is connected with the induced air frame, and branch pipeline butterfly valves are arranged at the inlets of the branch pipelines I and II to control the flow direction of medium-temperature flue gas. The number of the rising pipelines is half of the number of the furnace chambers of the open ring type roasting furnace, the opposite furnace chambers share one rising pipeline, and meanwhile, a rising pipeline butterfly valve is arranged between the rising pipeline and the main pipeline. And the branch pipeline I surrounds the raw block warehouse for a circle after entering the raw block warehouse, and a certain number of radiators are arranged on the branch pipeline I, so that heat in the flue gas is utilized for heating. The fan is connected with the flue gas outlet pipeline. And the main pipeline, the branch pipeline I and the branch pipeline II are subjected to heat preservation treatment. The invention has the advantages that: the invention solves the problem th