CN-116222209-B - Rotary hearth furnace drying method

CN116222209BCN 116222209 BCN116222209 BCN 116222209BCN-116222209-B

Abstract

The embodiment of the invention provides a rotary hearth furnace drying method, and relates to the field of metallurgy. The rotary hearth furnace drying method comprises the steps of igniting a hot blast furnace, starting a rotary hearth furnace combustion fan, converting high-temperature air generated in the hot blast furnace into low-temperature combustion air by utilizing a heat exchanger, drying a rotary hearth furnace refractory material by utilizing the low-temperature combustion air, adjusting the drying time according to a rotary hearth furnace drying curve table, performing low-temperature furnace drying on the rotary hearth furnace, adjusting the drying progress according to the rotary hearth furnace drying curve table, igniting a furnace body burner, and performing high-temperature furnace drying on the rotary hearth furnace. The low-temperature combustion air is utilized to dry the rotary hearth furnace refractory, the excessive drying of the refractory is avoided, the temperature of the rotary hearth furnace and the flow of the low-temperature combustion air are strictly regulated according to the rotary hearth furnace temperature rise curve table, the control of the temperature of the rotary hearth furnace and the quality of the rotary hearth furnace is ensured, the refractory can be better dried, and then the furnace body burner is ignited to perform high-temperature furnace drying on the rotary hearth furnace, so that the furnace drying operation of the rotary hearth furnace is better completed.

Inventors

LI JIANMING
LI JIANBING
LI HUAFENG
PENG FUCHENG
LI WEIGUO
ZENG HAIYAN
LONG FANGJU
XU XIANFA
LUO JIANFENG
CHEN ZHIWEI

Assignees

广东华欣环保科技有限公司

Dates

Publication Date: 20260508
Application Date: 20230328

Claims (4)

1. A rotary hearth furnace drying method, comprising: igniting the hot blast stove (10); Starting a combustion-supporting fan of a rotary hearth furnace (20), and converting high-temperature air generated in the hot blast furnace (10) into low-temperature combustion-supporting air by utilizing a heat exchanger, wherein after the combustion-supporting fan is started, the speed of the fan is gradually accelerated to a rated rotating speed, current data of the fan is monitored in the accelerating process, after the rotating speed and the current of the fan are constant, an outlet valve of the fan is opened, an inlet valve is gradually opened, so that the pressure of the fan meets the technological requirement, and flue gas after drying is discharged by a flip machine of the rotary hearth furnace (20); Drying the refractory material of the rotary hearth furnace (20) by utilizing the low-temperature combustion air, and adjusting the furnace drying time according to a furnace drying temperature rise curve table of the rotary hearth furnace (20); the method comprises the steps of carrying out low-temperature baking on a rotary hearth furnace (20), and adjusting the baking progress according to a baking temperature rise curve table of the rotary hearth furnace (20), wherein the gas amount and the combustion air amount of the hot blast furnace (10) are manually adjusted according to the temperature of the hot blast furnace (10) and the preheating temperature of air of the rotary hearth furnace (20), the preheating air flow and the preheating air temperature of the rotary hearth furnace (20) are controlled by a heat exchanger, and the heated air after baking is discharged by a turnover cover machine of the rotary hearth furnace (20); the hearth temperature range of the rotary hearth furnace (20) in the low-temperature furnace drying stage is 150-300 ℃; Igniting a furnace body burner and carrying out high-temperature furnace baking on the rotary hearth furnace (20); The rotary hearth furnace (20) comprises a heating zone, a first reduction zone, a second reduction zone, a third reduction zone, a fourth reduction zone and a fifth reduction zone which are sequentially communicated, the burning furnace body burner is ignited, and the step of performing high-temperature furnace baking on the rotary hearth furnace (20) further comprises the following steps: The ignition sequence of the rotary hearth furnace (20) starts from the internal and external burners of the reduction five zones, and then the ignition sequence is intersected to the reduction four zones, the reduction three zones, the reduction two zones, the reduction one zone and the heating zone; The temperature range of the rotary hearth furnace (20) in the high-temperature furnace baking stage is 300-1250 ℃.
2. A rotary hearth furnace drying process according to claim 1, characterized in that the temperature of the low temperature combustion air entering the rotary hearth furnace (20) ranges between 145 ℃ and 155 ℃.
3. The rotary hearth furnace drying method according to claim 1, wherein the step of igniting the furnace body burner to perform high temperature furnace drying of the rotary hearth furnace (20) comprises: and igniting the gas of the furnace body burner by using open fire, so that the gas is ignited to gradually ignite the furnace body burner to bake the rotary hearth furnace (20).
4. The rotary hearth furnace baking method according to claim 1, characterized in that the step of igniting the hot blast stove (10) comprises: The firewood is used for igniting the open flame to ignite coke oven gas, then igniting blast furnace gas, and the high-temperature flue gas of the hot blast stove (10) is discharged through a flue diffusing pipe.

Description

Rotary hearth furnace drying method Technical Field The invention relates to the technical field of metallurgy, in particular to a rotary hearth furnace drying method. Background In the prior art in the metallurgical field, how to bake a newly built rotary hearth furnace is a difficult problem to smoothly put into production, and the main characteristics are that whether the control of the temperature and the control of the time are proper or not and in place in the baking process determines the quality and the service life of the refractory materials of the rotary hearth furnace for subsequent production, the temperature is low, the time is short, the moisture of the refractory materials can not be baked, the requirements can not be met, the temperature is high, the time is long, the refractory materials can be excessively baked, and the waste is directly judged. The rotary hearth furnace in the prior art has the problems that the baking time and the baking temperature are not well known, so that the baking of the refractory is not dry or the baking is excessive. Disclosure of Invention The invention provides a rotary hearth furnace drying method, which can better grasp the time and temperature of a furnace, ensure that refractory materials can be well dried in the furnace drying process, and further better finish the furnace drying operation of the rotary hearth furnace. Embodiments of the invention may be implemented as follows: an embodiment of the present invention provides a rotary hearth furnace drying method including: igniting the hot blast stove; Starting a rotary hearth furnace combustion fan, and converting high-temperature air generated in the hot blast stove into low-temperature combustion air by using a heat exchanger; Drying the rotary hearth furnace refractory material by utilizing the low-temperature combustion air, and adjusting the furnace drying time according to a rotary hearth furnace temperature rise curve table; carrying out low-temperature baking on the rotary hearth furnace, and adjusting the baking progress according to a baking temperature rise curve table of the rotary hearth furnace; Igniting a burner of the furnace body, and carrying out high-temperature furnace baking on the rotary hearth furnace. Optionally, the step of starting the rotary hearth furnace combustion fan and converting the high-temperature air generated in the hot blast stove into the low-temperature combustion air by using the heat exchanger comprises the following steps: After the combustion-supporting fan is started, the speed of the fan is gradually accelerated to the rated rotation speed, current data of the fan is monitored in the acceleration process, after the rotation speed and current of the fan are constant, an outlet valve of the fan is opened, an inlet valve is gradually opened, the pressure of the fan meets the process requirement, and flue gas after drying is discharged by a rotary hearth furnace flip machine. Optionally, the temperature of the low temperature combustion air as it enters the rotary hearth furnace ranges from 145 ℃ to 155 ℃. Optionally, the step of performing low-temperature oven baking on the rotary hearth furnace and adjusting the oven baking progress according to the rotary hearth furnace oven baking temperature rise curve table comprises the following steps: And manually adjusting the gas quantity and the combustion-supporting air quantity of the hot blast stove according to the temperature of the hot blast stove and the preheating temperature of the rotary hearth furnace air. Optionally, the step of performing low-temperature furnace baking on the rotary hearth furnace and adjusting the furnace baking progress according to the furnace baking temperature rise curve table of the rotary hearth furnace further comprises: and controlling the preheated air flow and the preheated air temperature of the rotary hearth furnace by utilizing a heat exchanger, and discharging the hot air after the furnace baking by a turnover cover machine of the rotary hearth furnace. Optionally, the hearth temperature of the rotary hearth furnace in the low temperature furnace stage is in the range of 150 ℃ to 300 ℃. Optionally, the step of igniting the burner of the furnace body and performing high-temperature furnace baking on the rotary hearth furnace comprises the following steps: and igniting the gas of the furnace body burner by using open fire, so that the gas is ignited to gradually ignite the furnace body burner to bake the rotary hearth furnace. Optionally, the rotary hearth furnace comprises a heating zone, a first reduction zone, a second reduction zone, a third reduction zone, a fourth reduction zone and a fifth reduction zone which are sequentially communicated, the step of igniting the furnace body burner and performing high-temperature furnace baking on the rotary hearth furnace further comprises: The ignition sequence of the rotary hearth furnace starts from the inner burner and the o