阅读说明：本技术 一种酸再生焙烧炉防止炉底板结控制方法 (Control method for preventing furnace bottom from hardening in acid regeneration roasting furnace ) 是由 刘义学 高国亮 刘鹏 郭峰 韩赏 马睿智 张海乐 赵华 张延华 于 2021-08-23 设计创作，主要内容包括：本发明公开了一种酸再生焙烧炉防止炉底板结控制方法,包括以下步骤：1)流化床酸再生焙烧炉生产时,实时监测炉压、炉温、酸枪流量、燃气阀的开启量与螺旋输送机运行频率；2)在炉温处于异常状态,废酸流量不变的情况下通过调节燃气量；3)在炉温处于正常状态,增大废酸流量来控制炉温；4)当炉压升高时：若炉压值高出范围值,给与螺旋输送机信号,使螺旋输送机运行频率由正常运行频率65％提升到85％以上；5)仔细观察待炉压值到正常范围后停止放料,螺旋输送机运行频率恢复到65％；本发明设计的酸再生焙烧炉防止炉底板结控制方法将生产效益最大化,避免此故障紧急发生后影响生产计划,从而影响主线生产,提高了工作效率。(The invention discloses a control method for preventing a furnace bottom from being hardened in an acid regeneration roasting furnace, which comprises the following steps: 1) when the fluidized bed acid regeneration roasting furnace is produced, monitoring the furnace pressure, the furnace temperature, the acid gun flow, the opening amount of a gas valve and the running frequency of a spiral conveyor in real time; 2) adjusting the gas quantity under the conditions that the furnace temperature is in an abnormal state and the waste acid flow is not changed; 3) when the furnace temperature is in a normal state, the waste acid flow is increased to control the furnace temperature; 4) when the furnace pressure rises: if the furnace pressure value is higher than the range value, giving a signal to the screw conveyer to increase the operating frequency of the screw conveyer from the normal operating frequency of 65 percent to more than 85 percent; 5) carefully observing that the material is stopped to be discharged after the furnace pressure value reaches a normal range, and recovering the operating frequency of the screw conveyor to 65%; the control method for preventing the furnace bottom from being hardened for the acid regeneration roasting furnace maximizes the production benefit, and avoids the influence on the production plan after the fault occurs emergently, thereby influencing the main line production and improving the working efficiency.)

1. A control method for preventing furnace bottom hardening of an acid regeneration roasting furnace is characterized by comprising the following steps:

1) when the fluidized bed acid regeneration roasting furnace is produced, monitoring the furnace pressure, the furnace temperature, the acid gun flow, the opening amount of a gas valve and the running frequency of a spiral conveyor in real time;

2) when the furnace temperature is in an abnormal state and the waste acid flow is not changed, the gas quantity is adjusted to ensure that the high-temperature reduction reaction is carried out at the optimal temperature of the reaction;

3) when the furnace temperature is in a normal state, the waste acid flow is increased to control the furnace temperature, and in the operation process, a temperature curve needs to be observed in time to judge whether the reaction is complete;

4) when the furnace pressure rises: if the furnace pressure value is higher than the range value, giving a signal to the screw conveyer to increase the operating frequency of the screw conveyer from the normal operating frequency of 65% to more than 85%, increasing the conventional blanking speed, and carrying out manual blanking through an emergency blanking port;

5) carefully observing the furnace pressure value to a normal range, stopping discharging, recovering the operating frequency of the screw conveyor to 65%, and combining Fe³⁺The indexes of the waste acid floating, and the flow, the gas quantity and the air quantity of the waste acid are adjusted, so that the high-temperature reduction reaction is fully performed.

2. The method for controlling the acid regeneration roasting furnace to prevent the furnace bottom hardening according to claim 1, wherein the furnace pressure, the furnace temperature, the acid gun flow rate and the opening amount of the gas valve in the step 1) are linked with the operation frequency of the screw conveyor, and the numerical ranges of various parameters are set, and the numerical fluctuation of a single parameter can influence the numerical adjustment of other parameters.

3. The method for controlling prevention of furnace bottom hardening in an acid calciner according to claim 1, wherein the abnormal state of the furnace temperature in step 2) is an excess of a normal production temperature.

4. The method for controlling the acid regeneration roasting furnace to prevent the bottom hardening of the furnace according to claim 1, wherein the normal range of the furnace pressure in the step 4) is 262-267 mbar.

5. The method for controlling the acid regeneration roasting furnace to prevent the furnace bottom hardening according to claim 1, wherein when the furnace pressure in the step 4) rises to a pre-hardening precursor in the furnace, the furnace pressure rises due to the hardening of iron oxide balls in the furnace, a feed opening starts to be blocked, and then the furnace pressure rises, the furnace pressure rises and firstly gives a signal to the screw conveyor, and the screw conveyor accelerates the operation frequency, so that the feeding speed in the furnace is accelerated, and the furnace pressure change caused by the hardening phenomenon is relieved; the treatment speed is influenced when the hardening in the furnace begins, the waste acid is insufficiently reacted in the furnace due to the fluidization fluctuation of the iron oxide balls, the hardening phenomenon is deteriorated when the reaction is insufficient, the furnace temperature begins to increase, a gas valve opening temperature signal is given through the fluctuation range of furnace temperature data, the gas flow is reduced, an acid gun signal is given, and the waste acid flow is reduced; through mutual automatic adjustment of data, other data return to design values after the furnace temperature and the furnace pressure are normal and the hardening phenomenon disappears.

6. The method for controlling the acid regeneration roasting furnace to prevent the bottom hardening of the furnace according to claim 1, wherein the coke oven gas at the bottom of the fluidized bed acid regeneration roasting furnace enters the gas burner and the burner protecting sleeve through the gas pressure stabilizing station and the pipeline, the gas pipeline and the control valve, and burns the flowing iron oxide balls in the reaction furnace, the gas burner and the burner protecting sleeve are provided with an air box, one end of the air box is connected with a combustion-supporting fan for blowing combustion-supporting air to the gas burner and the burner protecting sleeve by the combustion-supporting fan, one side of the reaction furnace is provided with the acid gun, an air outlet arranged at the top of the reaction furnace is connected with the exhaust fan, and a feed opening at the lower part of the reaction furnace is connected with a variable-frequency screw conveyor.

Technical Field

The invention relates to the technical field of metallurgy, in particular to a control method for preventing a furnace bottom from hardening in an acid regeneration roasting furnace.

Background

The concentrated waste acid liquid (ferrous chloride) treated by the acid regeneration roasting furnace is pumped into the furnace through an acid gun at the side part of the lower furnace body, the furnace temperature and the furnace pressure are in a fluctuation state during production, if corresponding changes are not made in time, uneven heating can be caused, the caking phenomenon is easy to occur at the bottom of the roasting furnace, if no adjustment is made for a long time, the caking can be changed from small to large, the partial blockage of a burner at the bottom of the furnace can be caused, iron oxide powder is flaked and solidified, and the whole bottom of the furnace is completely caked in serious cases.

Usually, when the acid regeneration roasting furnace is hardened, the acid regeneration roasting furnace can only destroy and remove the re-filling material in the state to be produced, so that the production can be continued; under the condition of large hardening, the hardened structure is not easy to damage, and the furnace is not easy to clean and is forced to stop for maintenance.

In conclusion, the acid regeneration roasting furnace has high safety risk and high energy waste of the hardening phenomenon in the furnace caused by the fact that the waste acid flow, the gas quantity and the air quantity are not timely regulated due to the change of the furnace temperature and the furnace pressure, and the efficiency of an acid regeneration unit and the efficiency of subsequent recovery production are seriously influenced.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a control method for preventing the furnace bottom hardening of an acid regeneration roasting furnace.

The technical scheme adopted by the invention for solving the technical problems is as follows: a control method for preventing furnace bottom hardening of an acid regeneration roasting furnace comprises the following steps:

1) when the fluidized bed acid regeneration roasting furnace is produced, monitoring the furnace pressure, the furnace temperature, the acid gun flow, the opening amount of a gas valve and the running frequency of a spiral conveyor in real time;

2) when the furnace temperature is in an abnormal state and the waste acid flow is not changed, the gas quantity is adjusted to ensure that the high-temperature reduction reaction is carried out at the optimal temperature of the reaction;

3) when the furnace temperature is in a normal state, the waste acid flow is increased to control the furnace temperature, and in the operation process, a temperature curve needs to be observed in time to judge whether the reaction is complete;

4) when the furnace pressure rises: if the furnace pressure value is higher than the range value, giving a signal to the screw conveyer to increase the operating frequency of the screw conveyer from the normal operating frequency of 65% to more than 85%, increasing the conventional blanking speed, and carrying out manual blanking through an emergency blanking port;

5) carefully observing the furnace pressure value to a normal range, stopping discharging, recovering the operating frequency of the screw conveyor to 65%, and combining Fe³⁺The indexes of the waste acid floating, and the flow, the gas quantity and the air quantity of the waste acid are adjusted, so that the high-temperature reduction reaction is fully performed.

Specifically, the furnace pressure, the furnace temperature, the acid gun flow rate and the opening amount of the gas valve in the step 1) are linked with the operation frequency of the screw conveyor, the numerical ranges of various parameters are set, and the numerical fluctuation of a single parameter can influence the automatic adjustment of other parameter values.

Specifically, the abnormal state of the furnace temperature in the step 2) is that the normal production temperature is exceeded.

Specifically, the normal range of the furnace pressure in the step 4) is between 262 and 267 mbar.

Specifically, when the furnace pressure in the step 4) rises to be a precursor of hardening in the furnace, a feed opening starts to be blocked due to hardening of iron oxide balls in the furnace, and then the furnace pressure rises, the furnace pressure rises firstly, a signal is given to a spiral conveyor, the spiral conveyor accelerates the operation frequency, the feeding speed in the furnace is accelerated, and the furnace pressure change caused by the hardening phenomenon is relieved; the treatment speed is influenced when the hardening in the furnace begins, the waste acid is insufficiently reacted in the furnace due to the fluidization fluctuation of the iron oxide balls, the hardening phenomenon is deteriorated when the reaction is insufficient, the furnace temperature begins to increase, a gas valve opening temperature signal is given through the fluctuation range of furnace temperature data, the gas flow is reduced, an acid gun signal is given, and the waste acid flow is reduced; through mutual automatic adjustment of data, other data return to design values after the furnace temperature and the furnace pressure are normal and the hardening phenomenon disappears.

Specifically, coke oven gas at the bottom of the fluidized bed acid regeneration roasting furnace enters a gas burner and a burner protective sleeve through a gas pressure stabilizing station, a pipeline, a gas pipeline and a control valve, and burns flowing iron oxide balls in the reaction furnace, an air box is arranged at the gas burner and the burner protective sleeve, one end of the air box is connected with a combustion-supporting fan, the combustion-supporting fan is used for blowing combustion-supporting air to the gas burner and the burner protective sleeve, an acid gun is arranged at one side of the reaction furnace, an exhaust port arranged at the top of the reaction furnace is connected with a waste gas fan, and a feed opening at the lower part of the reaction furnace is connected with a variable-frequency screw conveyor.

The invention has the following beneficial effects:

control method for preventing furnace bottom hardening of acid regeneration roasting furnace designed by invention

1) Production benefits can be maximized, and the production plan is prevented from being influenced after the fault occurs emergently, so that the main line production is influenced, and the working efficiency is improved;

2) the service life of key equipment facilities such as burners, refractory materials and the like in the acid regeneration roasting furnace is prolonged, and the energy consumption caused by standby is greatly saved;

3) ensures the high efficiency of the acid regeneration unit and indirectly ensures the concentration of the regenerated acid

4) The method has clear and easily-realized control logic and strong applicability, and can be popularized and applied to acid regeneration roasting furnace units and the like.

Drawings

Fig. 1 is a schematic structural view of a fluidized bed acid regeneration roaster.

In the figure: 1-a waste gas fan; 2-acid gun; 3-a reaction furnace; 4-combustion-supporting fan; 5-combustion air; 6-air box; 7-gas pressure stabilizing station and pipeline; 8-gas pipeline and control valve; 9-a gas burner and a burner protective sleeve; 10-coke oven gas; 11-a feed opening; 12-screw conveyor.

Detailed Description

The technical solutions in the embodiments of the present invention will be described in further detail in the following clearly and completely with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, coke oven gas 10 at the bottom of the fluidized bed acid regeneration roasting furnace enters a gas burner and a burner protective sleeve 9 through a gas pressure stabilizing station and a pipeline 7, a gas pipeline and a control valve 8, and burns flowing iron oxide balls in a reaction furnace 3, a bellows 6 is arranged at the gas burner and burner protective sleeve 9, one end of the bellows 6 is connected with a combustion fan 4 for blowing combustion air 5 to the gas burner and burner protective sleeve 9 by the combustion fan 4, an acid gun 2 is arranged at one side of the reaction furnace 3, an exhaust port arranged at the top of the reaction furnace 3 is connected with a waste gas fan 1, and a discharge port 11 at the lower part of the reaction furnace 3 is connected with a variable-frequency screw conveyor 12.

A control method for preventing furnace bottom hardening of an acid regeneration roasting furnace adjusts the proportion of coke oven gas 10 and air according to the characteristics of the working condition of the fluidized bed acid regeneration roasting furnace, mainly the characteristics of furnace temperature and furnace pressure during reaction so as to obtain the optimal air-fuel ratio, and combines Fe³⁺The indexes of the acid regeneration roasting furnace float, and the flow, the gas quantity and the air quantity of waste acid are adjusted, so that the reaction is sufficient, and the aim of preventing the furnace bottom of the acid regeneration roasting furnace from hardening is fulfilled.

The specific technical scheme is as follows:

when the fluidized bed acid regeneration roasting furnace is produced, the furnace pressure, the furnace temperature, the acid gun flow, the opening amount of a gas valve and the running frequency of the screw conveyor 12 are monitored in real time.

When the furnace temperature rises: when the furnace temperature is in an abnormal state (generally, the furnace temperature exceeds the normal production temperature), and the waste acid flow is not changed, the gas quantity can be adjusted, so that the high-temperature reduction reaction is carried out at the optimal temperature of the reaction, and the hardening phenomenon in the furnace is prevented.

When the furnace temperature is in a normal state, the waste acid flow can be increased to control the furnace temperature, and in the secondary operation process, the temperature curve needs to be observed in time to judge whether the reaction is complete. The phenomenon that the humidity in the furnace is higher due to overlarge waste acid flow and the hardening is caused after the caking is generated is avoided.

When the furnace pressure rises: the normal range value of the furnace pressure is 262-267mbar, if the furnace pressure value is higher than the range value, a signal is given to the screw conveyor 12 to enable the operating frequency of the screw conveyor to be increased to more than 85% (the normal operating frequency is 65%), the conventional blanking speed is increased, manual blanking can be carried out through the emergency blanking port, the blanking is stopped after the furnace pressure value is carefully observed to reach the normal range, the operating frequency of the screw conveyor 12 is restored to 65%, and Fe is combined³⁺The indexes of the waste acid floating, and the flow, the gas quantity and the air quantity of the waste acid are adjusted, so that the high-temperature reduction reaction is fully performed.

The running period of the unit is interlocked by several numerical parameters of furnace pressure, furnace temperature, acid gun flow, opening amount of a gas valve and running frequency of the screw conveyor 12. The numerical value ranges in the process are set according to the specified flow, and the single numerical value fluctuation can further influence other parameter numerical values to carry out automatic adjustment.

If early hardening warning appears in the furnace, the feed opening starts to be blocked due to hardening of iron oxide balls in the furnace, and then the furnace pressure rises, the furnace pressure rise firstly gives a signal to the screw conveyor 12, the screw conveyor 12 accelerates the operation frequency, so that the feeding speed in the furnace is accelerated, and the furnace pressure change caused by the hardening phenomenon of a link is caused; the start of hardening in the furnace affects the processing speed, the waste acid is insufficiently reacted in the furnace due to the fluidization fluctuation of the iron oxide balls, the hardening phenomenon is deteriorated due to the insufficient reaction, the furnace temperature starts to increase, a gas valve opening degree signal is given through the fluctuation range of the furnace temperature data, the gas flow is reduced, and an acid gun 2 signal is given, so that the waste acid flow is reduced. Through mutual automatic adjustment of data, other data return to design values after the furnace temperature and the furnace pressure are normal and the hardening phenomenon disappears.

The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.

The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.