阅读说明：本技术 一种降低炼焦出炉推焦电流的推焦过程控制方法 (Coke pushing process control method for reducing coke pushing current of coke discharging ) 是由 王玉明 毛晓明 胡德生 钱晖 徐万仁 于 2018-06-28 设计创作，主要内容包括：本发明公开了一种降低炼焦出炉推焦电流的推焦过程控制方法,包括如下步骤：1)、待焦炉炼焦过程焦炭成熟后,打开炉门对焦炉炉墙左、上、右三面墙壁分别进行高压氧气吹扫至墙壁石墨烧除；2)待氧气吹扫结束后,将推焦杆对准焦炉中焦炭并逐渐向焦炭进行移动,当推焦杆移动到离焦炭23-25cm时瞬间停止1s后继续以推焦一档速度前进,当以一档速度前进1-1.2s后切换为2档,在以2档速度前进1-1.2s后切换为3档,在以3档速度前进6-7s后切换为4档,继续推送焦炭使焦炭推出炭化室。(The invention discloses a coke pushing process control method for reducing coke pushing current of a coking discharging furnace, which comprises the following steps: 1) after the coke is matured in the coking process of the coke oven, opening the oven door to respectively perform high-pressure oxygen purging on the left, upper and right walls of the oven wall of the coke oven until the graphite on the walls is burnt out; 2) after the oxygen purging is finished, aligning the coke pushing rod with coke in the coke oven and gradually moving the coke to the coke, instantly stopping for 1s when the coke pushing rod moves to the defocused carbon of 23-25cm, then continuously moving at the first coke pushing speed, switching to 2 when the coke pushing rod moves at the first coke pushing speed for 1-1.2s, switching to 3 when the coke pushing rod moves at the 2 speed for 1-1.2s, and switching to 4 when the coke pushing rod moves at the 3 speed for 6-7s, and continuously pushing the coke to push the coke out of the coking chamber.)

1. A coke pushing process control method for reducing coke pushing current of a coke discharging furnace is characterized by comprising the following steps:

1) after the coke is matured in the coking process of the coke oven, opening the oven door to respectively perform high-pressure oxygen purging on the left, upper and right walls of the oven wall of the coke oven until the graphite on the walls is burnt out;

2) after the oxygen purging is finished, aligning the coke pushing rod with coke in the coke oven and gradually moving the coke to the coke, instantly stopping for 1s when the coke pushing rod moves to the defocused carbon of 23-25cm, then continuously moving at the first coke pushing speed, switching to 2 when the coke pushing rod moves at the first coke pushing speed for 1-1.2s, switching to 3 when the coke pushing rod moves at the 2 speed for 1-1.2s, and switching to 4 when the coke pushing rod moves at the 3 speed for 6-7s, and continuously pushing the coke to push the coke out of the coking chamber.

2. The method for controlling the coke pushing process to reduce the coke discharging current of the coking furnace according to claim 1, wherein in the step 1), the high pressure oxygen pipe for high pressure oxygen purging sweeps the high pressure oxygen at an angle of 60-70 degrees to the wall at a position 3-4cm away from the front of the mature coke, the diameter of the purging outlet pipe is 10-12mm, and the purging time of a single wall is 15-20 s.

3. The coke pushing process control method for reducing the coke pushing current of the coke discharging oven according to claim 1 or 2, wherein in the step 1), the coke pushing interlocking device on the coke pushing car is used for opening the oven door, and the high pressure oxygen purging is started by using the robot and the high pressure oxygen pipe while the oven door is opened.

Technical Field

The invention belongs to the technical field of coke pushing production operation control, furnace wall safety protection and long service life control in a coking production process, and particularly relates to a coke pushing process control method for reducing coke pushing current of a coking discharging furnace.

Background

Along with the enlargement of the iron-making capacity, the coke capacity of the corresponding iron-making raw materials is rapidly expanded, and in order to produce more coke, a plurality of enterprises can produce the coke at full load, even some coke ovens can produce the coke at an overload, so that the phenomena of difficult coke pushing and large coke pushing current can be caused in the production process, and the normal production is further influenced. The difficult coke pushing or the large coke pushing current is a very important reason for damaging the coke oven body, and further the service life of the coke oven is reduced, and larger economic loss is caused.

When the coke pushing current exceeds the specified maximum current during coke pushing of the coke oven, the coke is called difficult to push. The coke cake is not pushed for the first time, and the second time is called secondary coke accident, generally called hard coke pushing. The coke oven body is greatly damaged by coke pushing accidents, which is a main cause of deformation of the coke oven body. Therefore, special management is needed for the coke oven with difficult coke pushing from the aspects of coke pushing, coal charging, heating, oven body maintenance and the like, so that the coke pushing difficulty can be reduced, otherwise, the coke pushing difficulty can be continuously generated, the damage of the adjacent carbonization chamber wall is caused, even the coke pushing difficulty spreads to the whole oven, the damage of the whole oven is accelerated, and the service life of the oven body of the coke oven is seriously influenced.

The difficult coke pushing and the large coke pushing current are not only important factors influencing the service life of the coke oven body, but also an important aspect influencing the continuous, stable and smooth operation of the coke oven production, and the problem of the difficult coke pushing accident is the important embodiment of the coke production management and the operation level. The main reasons for the coke cake difficult to push are as follows:

1. the coke cake has poor maturity. This is the most common and more manageable push-off phenomenon.

2. The graphite on the top of the carbonization chamber and the furnace wall is too much.

3. The coal charge is over full, and the coke line is over high.

4. The equipment fails.

5. The temperature is too high, and the coke is broken by over-fire.

6. Due to the artificial coal, the final shrinkage joint of the coal is small, and the coke pushing resistance is increased.

Although there are many factors that affect the coke pushing difficulty and the coke pushing current, the coal type and the proportion of the coal type of the coal blending ratio are key factors that affect the coke pushing current. This is mainly considered from the viewpoint of the raw material of coal. However, the operation of the production process is also a very important aspect, and many coke pushing heavy current and difficult coke pushing are caused by improper operation of the production process, so that the coke pushing current can be reduced or lowered through strict operation of the production process, so that the coke can be normally pushed out of the coke oven.

The coke pushing current is a very important process parameter in the coking production, the change of the coke pushing current reflects the maturity of coke, the reasonability of coal blending, the furnace condition and the running state of equipment, the change condition of the current in the coke pushing process is accurately and timely detected, particularly the accurate numerical value and time of the maximum coke pushing current and the change condition of a coke pushing current curve can be provided, and the method has very important guiding function on the production operation and the process standardized management of the coke oven.

Chinese patent publication No. CN102925184A proposes a method for coking lean coal with a large proportion, which mainly controls the mass percentage of coking coal in different ranges of reflectivity, so as to control the usage amount of different coals to ensure the quality of coke and reduce the production coke-pushing current, and the method is mainly used for a tamping coke oven, has many control factors, has a very long coking time of more than 25 hours, and has very high energy consumption and cost.

Chinese patent publication No. CN103849412A proposes a method for reducing the coke-pushing current, which mainly achieves the purpose of reducing the coke-pushing current by adjusting the variance of the reflectance of the blended coal, and the method has complicated calculation process, poor production reactivity and weak applicability.

Chinese patent publication No. CN1342740A proposes a coke pushing operation process detection and management system, which mainly performs operation management on a coke pushing process. There are other disclosures that attempt to reduce the coke push current, primarily through improved arrangements of the coke pusher. These methods have problems in some respects.

The phenomena of difficult coke pushing and large coke pushing current which often occur in the existing coke oven seriously affect the normal production of the coke oven, in particular the yield of coke production, thereby affecting the normal production of a blast furnace.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a coke pushing process control method which can reduce the loss of the oven wall of a coke oven and ensure the service life of the oven body of the coke oven and reduce the coke pushing current of the coke oven during the discharging process.

The technical problem to be solved can be implemented by the following technical scheme.

A coke pushing process control method for reducing coke pushing current of a coke discharging furnace. The method is characterized in that after coke is matured in the coking process of a coke oven, a coke pushing interlocking device on a coke pushing trolley is used for opening an oven door, a robot and a high-pressure oxygen pipe are used for blowing high-pressure oxygen at an angle of 60-70 degrees on the left, the upper and the right of the oven wall of the coke oven at a position which is about 3-4cm away from the front of matured coke while the oven door is opened, the pipe diameter of a pipe for blowing the oxygen is 10-12mm, the required time for each position is 15-20s at the front end of each wall at 3-4cm away from the matured coke, the purpose of oxygen blowing is to burn off graphite on the wall at the front end, the influence on the coke pushing is eliminated, after the oxygen blowing is finished, the coke pushing rod is gradually moved towards the coke in the coke oven, when the coke pushing rod moves to 23-25cm away carbon, the coke pushing rod is stopped for 1s instantly and then continues to move at a first coke pushing speed, and when, after the coke is advanced for about 1-1.2s at the speed of 2 grades, the coke is switched to 3 grades, after the coke is advanced for about 6-7s at the speed of 3 grades, the coke is continuously pushed to push the coke out of the carbonization chamber, each grade of the coke pushing process is controlled by a single electromagnetic relay, the resistance of each grade of the coke pushing motor is connected in series, the resistance connected in series from one grade to four grades is smaller and smaller, and the running speed of the motor is larger and larger.

By using the control method for the coke pushing process, when the coke pushing rod contacts the coke cake, the speed is switched from 1 gear to 2 gears, the coke cake is compressed at a very low speed until the coke cake starts to move, the advancing speed of the coke pushing rod does not change, the coke pushing rod does not start to be switched to a third gear after the coke cake starts to move normally, and the coke pushing rod is switched to a fourth gear after the coke in the third gear advances for about 6-7 seconds, so that the impact force of the coke pushing process on the coke is reduced, the coke pushing process is stable, and the coke pushing current is reduced.

The coke pushing process control method for reducing the coke pushing current of the coke discharging furnace can effectively reduce the coke pushing current of the coke pushing process, relieve the pressure of fluctuation of the coke pushing current on high operating rate, greatly reduce the coke pushing power consumption of the coke production process, reduce the loss of the coke furnace wall and ensure the long service life of the coke furnace body; meanwhile, the use proportion of coking weak caking coal can be increased, the continuous production of a coke oven can be effectively ensured, the environmental pollution and energy waste caused by difficult coke pushing and coke scraping are reduced, the improvement of the coke yield is facilitated, the production cost is reduced, the stability of the production process of a blast furnace is ensured, and the economic benefit of enterprises is improved.

The control method has the following effects:

1. the method can effectively reduce the coke pushing current in the coking coke pushing process, relieve the pressure of the fluctuation of the coke pushing current on high operating rate, and greatly reduce the coke pushing power consumption in the coking production process.

2. The pressure on the furnace wall in the coke pushing process can be reduced, so that the damage to the furnace wall, particularly the furnace head part on the machine side, is reduced, and the long service life of the coke oven body is ensured.

3. Under the condition of shortage of coal resources, the range of coal types for the coke oven can be expanded, the use proportion of weak caking coal in the blended coal is increased, the coal quality requirement of the blended coal is properly reduced, and the problem of shortage of the current coking coal resources can be partially relieved.

4. The continuous production of the coke oven can be effectively ensured, the environmental pollution and energy waste caused by difficult coke pushing and coke scraping are reduced, the coke yield is favorably improved, the production cost is reduced, the stability of the production process of the blast furnace is ensured, and the economic benefit of enterprises is improved.

Detailed Description

The following provides a more detailed description of the present invention with reference to specific examples.