Device for quickly treating hanging materials and coke floating at initial stage of use of large-scale dry quenching furnace on line

Abstract

The utility model relates to a device for quickly processing hanging materials and coke floating in the initial stage of use of a large-scale dry quenching furnace on line, which comprises an air cannon, a blowing pipeline and a gas storage tank, a blowing pipe of the air cannon is connected with the blowing pipeline, the blowing pipeline is communicated with a cooling chamber area in the dry quenching furnace and the bottom area of a chute area, and the gas storage tank is connected with the blowing pipeline. The purging pipeline is obliquely arranged downwards along the inner wall of the dry quenching furnace, the included angle between the purging pipeline in the cooling chamber area and the vertical direction of the dry quenching furnace is 30-45 degrees, and the included angle between the purging pipeline in the bottom area of the chute area and the chute of the dry quenching furnace is 15-20 degrees; and the gas storage tank is connected with the air cannon. The method has the advantages of solving the problem of material hanging at the initial stage of large-scale dry quenching production, shortening the standard production time, rapidly reaching the standard production and improving the production efficiency. An air cannon is used for forming a paroxysmal air source, the air source with large local pressure intensity directly acts on a coke sticking and hanging part, so that the hanging part is loosened, and the coke falls off under the combined action of friction force generated by descending of the coke.

Description

Technical Field

[0001] The utility model belongs to the field of dry quenching coke oven production, in particular to a device for quickly processing material hanging and coke floating in the initial stage of operation of a large dry quenching oven online. Background Art

[0002] With the increasing construction of blast furnaces and coke ovens, the large-scale development of CDQ units is the future development direction. Currently, my country's existing CDQ units have a processing capacity of 65 to 260 t / h. Based on processing capacity, they can be categorized as small, medium, and large. Small units have a processing capacity of less than 125 t / h, medium units have a processing capacity of 125 to 170 t / h (excluding 170 t / h), and large units have a processing capacity of 170 to 260 t / h. Large CDQ units typically reach full production in 20 to 30 days. Because each CDQ unit overhaul takes over a month, the time it takes to put large CDQ units into full production after each overhaul is long, resulting in production difficulties and low CDQ rates. Research on methods to rapidly reach full production for large CDQ units is urgent.

[0003] The reasons for the prolonged time to reach full production capacity are: When the CDQ furnace is finished, large CDQ furnaces, due to their larger structure, require a longer manhole construction time and longer furnace gas replacement time, resulting in a greater drop in furnace temperature than small CDQ furnaces. When large CDQ furnaces are switched to production with red coke, the temperatures at measuring points T3 and T4, as well as at the chute, are lower than those at T3, T4, and at the chute after loading with small and medium-sized CDQ furnaces. The wall temperature does not reach the melting point required for tar-like adhesives. This results in sticky coke blocking the CDQ chute and causing coke to accumulate in the cooling chamber. Furthermore, newly commissioned CDQ furnaces have not been subjected to normal production conditions, resulting in incomplete removal of moisture and coke friction on the working surface. This manifests as coke flowing downward in a core-pulling pattern, with rapid discharge from the center. In severe cases, red coke may even be discharged from the CDQ furnace. To rapidly cool the red coke in the center, increased circulating air volume is required, while the surrounding coke continues to cool. The cooling wall bricks gradually cooled, causing coke hanging to worsen. The area of ​​coke hanging around the perimeter of the cooling wall gradually expanded, while the area in the center and lower part of the wall gradually narrowed. Coke stuck to the chute and on the cooling wall formed a solid ring-shaped plate that could not be lowered. The floating coke at the chute seriously blocked the circulating air ventilation in the chute, resulting in increasing negative pressure at the boiler inlet. The boiler inlet temperature did not increase with the increase in circulating air volume, and the pressure in the pre-storage chamber fluctuated frequently. Gradually increasing the circulating air volume caused the circulation system to become increasingly chaotic.

[0004] Currently, the common method for solving the problem of material hanging in the cooling chamber of the CDQ furnace is to use intermittent material pulling during large and small coke discharge. The material hanging is gradually removed by utilizing the friction of coke during large-scale coke discharge and the shock force caused by frequently changing the discharge speed. This method generally reaches full production in about 30 days, and it takes longer for severe material hanging, mainly because some severe material hanging cannot be completely removed. This results in long-term uneven material discharge in the cooling chamber of the CDQ furnace, and uneven and continuously high coke discharge temperatures. While intermittent material pulling solves the problem of material hanging, the long-term and instantaneous temperature field changes at the chute bracket damage the CDQ furnace bracket and ring beam structure. After the CDQ coke is put into production, the bracket bricks of some of the cokes crack and fall, posing an irreversible risk of damage to the CDQ furnace. In addition, this method cannot solve the problem of coke hanging at the chute mouth. Summary of the Invention

[0005] The purpose of the utility model is to provide an online and rapid device for processing coke hanging and coke floating in the initial stage of operation of a large-scale dry quenching furnace. An air cannon device is used to form a paroxysmal air source, which directly acts on the blocked areas and parts of the coke hanging and the coke floating on the chute, so as to promote the rapid shedding of the coke hanging and solve the problem of long production time caused by uneven material feeding.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A device for quickly and online treating coke hanging and coke floating in the initial stage of operation of a large-scale dry quenching furnace comprises an air cannon, a purge pipe, and a gas storage tank. The air cannon's blowing pipe is connected to the purge pipe, and the purge pipe is in communication with the cooling chamber area and the bottom area of ​​the chute area inside the dry quenching furnace. The purge pipe is arranged obliquely downward along the inner wall of the dry quenching furnace, and the angle between the purge pipe in the cooling chamber area and the vertical direction of the dry quenching furnace is 30° to 45°, and the angle between the purge pipe in the bottom area of ​​the chute area and the dry quenching furnace chute is 15° to 20°. The gas storage tank is connected to the air cannon, and the gas storage tank is a nitrogen gas storage tank.

[0008] The air cannons are installed on the peripheral platform of the CDQ furnace, and the distance between the air cannons is 0.9 to 1 meter.

[0009] The purge pipeline is connected with a solenoid valve.

[0010] The purge pipeline is arranged along the radial direction of the CDQ furnace.

[0011] The purge pipes are arranged in multiple layers along the longitudinal direction in the cooling chamber area and the bottom area of ​​the ramp area inside the dry quenching furnace.

[0012] The connection between the purge pipe and the dry quenching furnace is connected with a flange.

[0013] A blind plate is connected to the flange.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The utility model solves the problem of material hanging in the early stage of large-scale dry quenching, shortens the time to reach full production, quickly reaches full production and improves production efficiency. The utility model has a simple structure, uses an air cannon to form a paroxysmal gas source, and the gas source with a relatively high local pressure directly acts on the coke-sticky hanging part, loosening the hanging part, and the friction generated by the falling coke acts together to cause it to fall off. At the same time, the purge pipe is set at an angle downward, and the angle with the vertical direction of the dry quenching furnace is 30° to 45°, which promotes the rapid shedding of the hanging material in the dry quenching furnace while protecting the structural stability of the dry quenching furnace refractory material, improving the dry quenching rate, and ensuring long-term continuous production of the dry quenching system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the present utility model.

[0017] Figure 2 yes Figure 1 A partial enlarged view of .

[0018] Figure 3 It is a top view of the present utility model.

[0019] Figure 4 It is a control principle diagram of the present utility model.

[0020] In the figure: 1-air cannon 2-purge pipe 3-external platform 4-CDQ furnace 5-flange 6-T3 temperature measuring point 7-T4 temperature measuring point. DETAILED DESCRIPTION

[0021] The present invention will be described in detail below with reference to the accompanying drawings. However, it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0022] See Figure 1-Figure 3, a device for online rapid treatment of material hanging and coke floating in the initial stage of commissioning of a large-scale dry quenching furnace, comprising an air cannon 1, a purge pipe 2, and a gas storage tank. The gas storage tank is connected to the air cannon 1 to provide nitrogen for the air cannon 1. During actual production, it was found that material hanging in the dry quenching furnace 4 mainly occurred in the cooling chamber of the dry quenching furnace 4 (including the T3 and T4 temperature measuring points 6 and 7 areas), and coke accumulation and floating occurred in the bottom area of ​​the chute. Therefore, the air cannon 1 is also arranged in the cooling chamber of the dry quenching furnace 4 and the chute area of ​​the dry quenching furnace 4. Air cannons 1 are arranged in multiple layers in the circumferential direction of the cooling chamber, and the air cannons 1 on the upper layer are set directly above the air cannons 1 on the lower layer. The distance between adjacent air cannons 1 in the longitudinal and transverse directions is 0.9 to 1 meter, and the circumferential encirclement can be less than 0.9 meters and not more than 1 meter. Air cannons 1 are arranged 0.7 meters upward from the bottom of each chute in the chute area, with a total of 24 groups of air cannons 1. The air cannon 1 is installed on the outer platform 3 of the dry quenching furnace 4. The blowing pipe of the air cannon 1 is connected to the purge pipe 2. The purge pipe 2 is connected to the bottom area of ​​the cooling chamber area and the inclined area inside the dry quenching furnace 4. The purge pipe 2 is arranged obliquely downward along the inner wall of the dry quenching furnace 4. In the cooling chamber area, the angle between the purge pipe 2 and the vertical direction of the dry quenching furnace 4 is 30° to 45°; in the inclined area, the angle between the purge pipe 2 and the inclined downward direction of the dry quenching furnace 4 is 15 to 20°; the refractory material inside the dry quenching furnace 4 is masonry reserved with holes in the same blowing direction, so that the blowing gas is sprayed obliquely downward along the inclined edge of the inner wall of the dry quenching furnace 4 and the cooling chamber.

[0023] A solenoid valve is connected to purge pipe 2, located before the submerged pulse valve of air cannon 1. This prevents leaks from one pulse valve from affecting the pressure of other pulse valves. When air cannon 1 is used for purge operation, both the solenoid valve and the pulse valve are opened simultaneously. To close the solenoid valve, close the pulse valve first.

[0024] Air cannon 1 uses a sudden, intense burst of compressed gas at supersonic speed to penetrate the blocked, faulty area of ​​the CDQ furnace 4 storing bulk materials. This sudden, expanding shockwave overcomes static friction within the material, restoring fluidity within the CDQ furnace 4. Air cannon 1 is mounted on the peripheral platform 3 of the CDQ furnace 4. A gas purge pipe 2 connects the cooling chamber and the bottom of the chute within the CDQ furnace 4. When high-pressure gas is applied, it acts on the hanging material area, causing it to loosen and fall off.

[0025] The purge ducts 2 are arranged radially along the CDQ furnace 4. They are arranged in multiple layers longitudinally within the cooling chamber and the bottom of the ramp area within the CDQ furnace 4. The number and number of purge ducts 2 layers are determined by the size of the CDQ furnace 4. Flanges 5 connect the purge ducts 2 to the CDQ furnace 4. A blind plate is attached to the flange 5 to prevent gas leakage during normal production.

[0026] The gas storage tank is a nitrogen gas storage tank. The distance between adjacent air cannons 1, both longitudinally and transversely, is 0.9 to 1 meter. To facilitate effective air flow, the air cannons 1 are of an adjustable gas pressure type, with a pressure adjustment range of 0.3 to 0.6 MPa.

[0027] A gas storage tank supplies nitrogen to air cannon 1. When the solenoid valve opens, air cannon 1 sprays nitrogen through purge pipe 2 into the CDQ furnace 4. The air cannons 1, arranged in layers at different angles, spray at regular intervals. The spray intervals, spray positions, and purge frequency are adjusted to suit the location of the coke hanging. This loosens the hanging material, allowing the friction generated by the coke's descent to work together to dislodge it. During the spraying process, all air cannons 1 are inspected to prevent gas leaks that could reduce their efficiency and waste energy.

[0028] See Figures 1-4 When the device for online rapid treatment of initial coking and coke floating in a large CDQ furnace is in operation, air cannon 1 uses nitrogen as its gas source, and cooperates with corresponding circulating air volume adjustment and coke discharge volume adjustment methods to achieve online rapid treatment of initial coking and coke floating in a large CDQ furnace. Specifically, the following steps are included:

[0029] (1) Reduce the air volume of the circulating fan of the CDQ furnace 4 to the minimum of the design value. The circulating air volume during the spraying period is set to the minimum air volume, and the operating frequency is 10Hz. Ensure that the negative pressure in the chute area of ​​the CDQ furnace 4 (the pressure is determined by the suction force of the circulating fan inlet) is reduced to a minimum, and the suction force at the chute entrance is minimized; if the air volume is too large, the spraying effect will be affected, and the coke will further float in the chute area;

[0030] (2) Control the amount of coke discharge. When the coke discharge temperature does not exceed the heat-resistant temperature of the coke discharge belt, try to increase the amount of coke discharge to speed up the flow of coke in the CDQ furnace 4 and increase the friction entrainment of coke. This method is to cooperate with the opening of the air cannon 1 device to cause the coke at the chute to slide quickly back to the cooling chamber.

[0031] The coke discharge belt is a belt conveyor for receiving the coke discharged from the bottom of the dry quenching furnace 4 (referred to as the coke discharge belt), and its heat-resistant temperature is below 250°C.

[0032] (3) The air cannon 1 sprays in sequence along the radial direction of the dry quenching furnace 4, from top to bottom. When using the air cannon 1, first select a certain point or multiple weak points of hanging materials. The air cannons 1 arranged in the area are manually or automatically controlled to spray in sequence along the radial direction of the dry quenching furnace 4, from bottom to top. The air cannons 1 facing each layer are manually or automatically controlled to spray in sequence. The spraying time of each time is controlled to be less than 5 minutes, with an interval of 2 to 3 seconds. The spraying pressure of the air cannon 1 is 0.3 to 0.6 MPa.

[0033] (4) After one cycle of injection is completed, observe the coke discharge temperature. If the coke discharge temperature still does not exceed the heat-resistant temperature of the coke discharge belt, enter the next injection cycle and repeat step (3) until the coke discharge temperature exceeds the heat-resistant temperature of the coke discharge belt (250°C), and then end the injection;

[0034] (5) When the average coke discharge temperature returns to <120℃, the next step of oscillating coke discharge can be carried out, that is, large and small coke discharges are carried out alternately, with an alternating time interval of 10 minutes; as the coke discharge amount increases or decreases, the circulating air volume is also adjusted at the same time. During coke discharge, the air-to-material ratio of the CDQ is adjusted according to the air-to-material ratio (1430Nm 3 / h or less) to control the circulating air volume (the gas-to-material ratio is the circulating air volume used to extinguish 1 ton of coke) to avoid excessive gas-to-material ratio causing further accumulation of coke on the chute and aggravating coke floating.

[0035] (6) After 40 minutes of vibration and de-coking, repeat the blowing in step (3) until the hanging material is relieved and falls off.

[0036] (7) After the hanging material falls off, the air cannon 1 in the chute area is opened in sequence for spraying. At the same time, the coke discharge volume is increased to 80% of the designed maximum value. The coke discharge temperature does not exceed 250℃, and the air-to-material ratio of CDQ is minimized. The downward blowing effect of the spraying on the coke floating in the chute area, the downward friction entrainment effect of the coke discharge, and the reduction of the suction force of the circulating air in the chute area after the air-to-material ratio is reduced, all work together to cause the coke floating in the chute area to slide back into the cooling chamber.

[0037] Through the above specific embodiments, those skilled in the art can easily implement the present invention. However, it should be understood that the present invention is not limited to the above specific embodiments. Based on the disclosed embodiments, those skilled in the art can arbitrarily combine different technical features to achieve different technical solutions. Due to space limitations and to keep the specification concise, each solution formed by these combinations is not described one by one. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. An online and rapid device for treating the initial material hanging and coke floating in a large-scale dry quenching furnace, characterized in that: It includes an air cannon, a purge pipe, and a gas storage tank. The blowing pipe of the air cannon is connected to the purge pipe. The purge pipe is connected to the cooling chamber area and the bottom area of ​​the ramp area inside the dry quenching furnace. The purge pipe is arranged downwardly along the inner wall of the dry quenching furnace, and the angle between the purge pipe in the cooling chamber area and the vertical direction of the dry quenching furnace is 30° to 45°. The angle between the purge pipe in the bottom area of ​​the ramp area and the ramp of the dry quenching furnace is 15° to 20°; the gas storage tank is connected to the air cannon; the gas storage tank is a nitrogen gas storage tank.

2. The device for online rapid treatment of initial material hanging and coke floating in a large-scale dry quenching furnace according to claim 1 is characterized in that: The air cannons are installed on the peripheral platform of the CDQ furnace, and the distance between the air cannons is 0.9 to 1 meter.

3. The device for online rapid treatment of coke hanging and coke floating in the initial stage of operation of a large-scale dry quenching furnace according to claim 1 is characterized in that: The purge pipeline is connected with a solenoid valve.

4. The device for online rapid treatment of coke hanging and coke floating in the initial stage of operation of a large-scale dry quenching furnace according to claim 1 is characterized in that: The purge pipeline is arranged along the radial direction of the CDQ furnace.

5. The device for online rapid treatment of coke hanging and coke floating in the initial stage of operation of a large-scale dry quenching furnace according to claim 1 is characterized in that: The purge pipes are arranged in multiple layers along the longitudinal direction in the cooling chamber area and the bottom area of ​​the ramp area inside the dry quenching furnace.

6. The device for online rapid treatment of coke hanging and coke floating in the initial stage of operation of a large-scale dry quenching furnace according to claim 1 is characterized in that: The connection between the purge pipe and the dry quenching furnace is connected with a flange.

7. The device for online rapid treatment of coke hanging and coke floating in the initial stage of operation of a large-scale dry quenching furnace according to claim 6, characterized in that: A blind plate is connected to the flange.

Images