A dry quenching double coke discharging device

Abstract

The utility model relates to the field of dry quenching coke production, concretely relates to dry quenching coke double coke discharging device. It mainly includes electric flat gate valve, electromagnetic vibration feeder, rotary seal valve, purge fan, automatic lubricating device, its characterized in that dry quenching coke oven bottom is set down with double fork groove discharge port, and each electric flat gate valve is installed on the upper portion of double fork groove discharge port respectively, the lower portion of electric flat gate valve, double fork groove discharge port are connected with respective electromagnetic vibration feeder with soft connection respectively, the lower portion of electromagnetic vibration feeder is connected with respective rotary seal valve with soft connection respectively, and the coke discharge groove below the lower portion of rotary seal valve is installed with respective coke conveying belt respectively. Two sets of coke discharging devices, one open one ready, can realize the uninterrupted coke discharging. Avoid the maintenance personnel poisoning accident, guarantee the economic benefit.

Description

Technical Field

[0001] This utility model relates to the field of dry quenching coke production, specifically to a dry quenching coke double-row coke device. Background Technology

[0002] Compared to wet quenching, dry quenching improves coke strength and reduces its reactivity, which is beneficial for blast furnace operation, especially for large blast furnaces with stringent quality requirements. Dry quenching offers significant advantages (reducing the blast furnace fuel ratio, increasing the iron tapping ratio, raising the furnace top temperature, and increasing pulverized coal injection), while also reducing atmospheric pollution. Dry quenching recovers waste heat from red-hot coke to generate steam, which can be used for power generation, avoiding the atmospheric pollution caused by burning coal to produce the same amount of gas (5-6 tons of steam requires 1 ton of thermal coal). For a coking plant with a scale of 1 million tons / year, adopting dry quenching technology can reduce atmospheric pollution from the combustion of thermal coal by 80,000-100,000 tons annually. This is equivalent to reducing emissions of 144-180 tons of particulate matter and 1280-1600 tons of SO2, and especially reducing CO2 emissions by 100,000-175,000 tons annually. Dry quenching also saves water; Baosteel saves an average of more than 0.44 tons of water per ton of coke. The use of dry quenching technology reduces coking energy consumption by 50-60 kgce / t coke.

[0003] In summary, dry quenching has the following advantages:

[0004] 1. Absorbs the heat from red-hot coals, saving energy.

[0005] Traditional coke quenching methods use water spraying for cooling, resulting in significant waste of the sensible heat of the red-hot coke. This is because refining 1 kg of coke consumes approximately 750-800 kcal of heat, while wet quenching wastes up to 355 kcal. Dry quenching avoids these drawbacks, absorbing about 80% of the heat from the red-hot coke to generate steam. Dry quenching can produce 570-620 kg of medium-pressure steam at 450℃ and 3.8 MPa per ton of coke (steam pressure varies depending on the plant), and in practice, it can produce even higher pressure.

[0006] II. Improving the quality of coke

[0007] The coke undergoes a re-coking process in the pre-storage chamber of the dry quenching furnace. Furthermore, its even descent and slow cooling during discharge result in fewer cracks and better strength. Additionally, the easy separation of dry-quenched coke from coke powder reduces screening difficulties, and the coke powder can serve as an important raw material for sintering.

[0008] Third, it improved the environment and reduced pollution.

[0009] In wet quenching, the water used for quenching mainly comes from the cooling water of the chemical plant, which contains a large amount of harmful substances such as phenols and cyanides. The steam generated by wet quenching and the corrosive media such as phenols, cyanides, and sulfides remaining in the coke corrode surrounding buildings and can spread to a range of several kilometers. The harmful substances exceed environmental standards by several times, causing large-scale air pollution.

[0010] Currently, all dry quenching coke discharge systems operate with only one set of discharge devices running online. When a malfunction or foreign object blockage occurs, the system must be shut down for repair. Each time this happens, the circulating fan speed must be reduced to a minimum of 10 Hz or the system must be shut down directly. This causes the dry quenching boiler to lose its heat source, and the evaporation rate drops instantly to around 20 tons / hour or even 0 tons. This severely affects the boiler's steam output and often causes production reductions or shutdowns in downstream steam-using processes. Furthermore, to minimize the impact on production, repairs are always done urgently, which is time-sensitive and demanding. This could potentially lead to personal injury accidents such as poisoning or suffocation of maintenance personnel. For example, the rotary sealing valve in the dry quenching coke discharge unit is the most frequent and most common fault among all dry quenching coke malfunctions. Each time a fault is dealt with, coke discharge must be stopped, the flat gate closed, the circulating fan reduced or stopped, and then the rotary sealing valve manhole opened for treatment. In order to reduce the impact of production interruption, the personnel must continuously handle the emergency. Even if the fault is dealt with in the fastest time, steam production will be interrupted or reduced for 2-3 hours, which will have a great impact on the subsequent steam turbine power generation or even cause the turbine to shut down. Summary of the Invention

[0011] The purpose of this invention is to provide a dry quenching double coke discharge device that can achieve uninterrupted coke discharge.

[0012] This utility model mainly includes an electric flat gate valve, an electromagnetic vibrating feeder, a rotary sealing valve, a purge fan, and an automatic lubrication device. Its key feature is that a double-fork trough discharge port is provided below the bottom discharge port of the dry quenching coke oven. Each electric flat gate valve is installed above the double-fork trough discharge port. The lower part of the electric flat gate valve and the upper part of the double-fork trough discharge port are connected to their respective electromagnetic vibrating feeders via flexible connections. The lower part of the electromagnetic vibrating feeders is connected to their respective rotary sealing valves via flexible connections. Each rotary sealing valve has its own coke conveyor belt installed below its coke discharge trough. The sealing nitrogen used by the rotary sealing valve is provided by the purge fan. The rotary sealing valve is equipped with an automatic lubrication device.

[0013] The interior of the aforementioned double-fork trough discharge port is lined with wear-resistant cast iron bricks to prevent wear and tear on the equipment caused by long-term coke discharge.

[0014] The nitrogen gas and lubrication used by the two rotary sealing valves mentioned above are provided by a purge fan and an automatic lubrication device, respectively.

[0015] The included angle of the above-mentioned double-fork trough discharge port is 90°-120°.

[0016] The optimal included angle for the aforementioned double-fork grooved discharge port is 90 degrees.

[0017] The aforementioned coke conveyor belt is equipped with an electronic belt scale, a high-temperature radiation meter, and an overheating water spray device. The electronic belt scale continuously weighs the coke, and adjusts the amplitude of the electromagnetic vibrating feeder by the deviation between the weighed value and the set value, thereby stabilizing the coke discharge rate. If the high-temperature radiation meter detects that the temperature of the discharged coke exceeds the set upper limit, the water spray device will immediately start spraying water to cool it down and protect the belt conveyor from high-temperature damage.

[0018] The aforementioned coke conveyor belt is equipped with dust collection points at both the head and tail discharge points, as well as belt alignment devices and pull rope switches to ensure the safe and normal operation of the conveyor belt.

[0019] Compared with existing technologies, this utility model has the following advantages:

[0020] (1) After adopting the double coke discharge device, when dealing with dry quenching coke swirl jamming accidents and various coke discharge system failures, we can immediately switch the coke discharge system without stopping or reducing the speed of the circulating fan, start the online standby coke discharge system, and shut down the faulty coke discharge system to handle the accident or failure. Without stopping or reducing the speed of the circulating fan, it means that we can handle the accident without stopping production, without affecting steam output, and without affecting downstream processes.

[0021] (2) When dealing with faults, we do not need to rush and neglect safety. We can carry out equipment fault handling after doing a thorough and comprehensive safety job. This ensures the safety of maintenance personnel and avoids personal injury caused by inadequate safety measures.

[0022] (3) Economic benefits ① Direct economic benefits: Each dry quenching rotary valve jamming accident takes at least 2 hours to resolve. To fully restore normal production levels, it will take at least 4 hours. During this period, the boiler produces an average of 60t / h of steam, which would result in an additional 240t of steam. With 3 sets of dry quenching rotary valves, there will be at least 20 such incidents per year. At 200 yuan per ton of medium-pressure steam, 240t * 200 yuan / t * 20 incidents = 960,000 yuan. ② Indirect economic benefits: From the start of the blower shutdown to the full restoration of production, the generator driven by the dry quenching will be shut down. If the blower is not shut down, the generator will not stop. Based on the impact time in ①, and assuming an average power generation of 10,000kw / h, 4h * 10,000kw / h = 40,000kw of electricity. At 0.5 yuan per kilowatt-hour, 0.5 yuan * 40,000kw * 20 incidents = 400,000 yuan. The combined economic gains from ① and ② amount to a total economic benefit of 1,360,000 yuan.

[0023] (4) Safety benefits: It avoids the occurrence of accidents such as poisoning or suffocation of maintenance personnel caused by the annual handling of dry quenching coke and sludge jamming. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of the structure of this utility model.

[0026] In the diagram: 1. Bottom feed port of dry quenching coke oven, 2. Double fork trough feed port, 3. Electric flat gate valve, 4. Electromagnetic vibrating feeder, 5. Rotary sealing valve, 6. Coke discharge chute, 7. Coke conveyor belt, 8. Wear-resistant cast iron brick. Detailed Implementation Example

[0027] like Figure 1 As shown, the double-row coke oven mainly includes an electric flat gate valve 3, an electromagnetic vibrating feeder 4, a rotary sealing valve 5, a purge fan, and an automatic lubrication device. A double-fork trough discharge port 2 is set below the bottom discharge port 1 of the dry quenching coke oven. Each electric flat gate valve 3 is installed on the double-fork trough discharge port 2. The lower part of the electric flat gate valve 3 and the double-fork trough discharge port 2 are connected to the respective electromagnetic vibrating feeder 4 by flexible connection. The lower part of the electromagnetic vibrating feeder 4 is connected to the respective rotary sealing valve 5 by flexible connection. Each coke conveyor belt 7 is installed below the coke discharge trough 6 below the rotary sealing valve 5. The sealing nitrogen used by the rotary sealing valve 5 is provided by the purge fan. The rotary sealing valve 5 is equipped with an automatic lubrication device.

[0028] To prevent wear and tear on the equipment from long-term coke discharge, wear-resistant cast iron bricks 8 are laid inside the double-fork trough discharge port 2. Inside the double-fork discharge port, the wear-resistant cast iron bricks are laid and fixed one by one according to the designed laying plan. During the laying process, it is essential to ensure a tight fit between the bricks, avoiding gaps, and ensuring effective wear protection throughout the entire discharge port. After the wear-resistant cast iron bricks are laid, the discharge port is thoroughly inspected to ensure there are no loose parts or gaps. Then, a trial run is conducted to observe the coke discharge effect, sealing performance, and wear resistance. Necessary adjustments and optimizations are made based on the actual situation.

[0029] The nitrogen gas and lubrication used by the two rotary sealing valves mentioned above are provided by a purge fan and an automatic lubrication device, respectively.

[0030] The included angle of the aforementioned double-fork grooved discharge port can be 90°-120°. To ensure good coking effect, 90° is optimal.

[0031] Coke is continuously discharged in a closed system; the coke discharge chute is responsible for conveying the coke to the belt conveyor to ensure the continuous and normal operation of the unit. In addition, the purging blower blows nitrogen into the feeder and rotary sealing valve to maintain positive pressure inside the equipment, prevent dust from entering, and reduce coil temperature; the automatic lubrication pump provides grease to the bearings and sealing rings of the rotary sealing valve at regular intervals and in measured quantities to extend the service life of the equipment.

[0032] The coke cooled in the dry quenching furnace cooling section passes through a flat gate, an electromagnetic vibrating feeder, a rotary sealing valve, and a coke discharge chute in sequence, and is finally discharged onto a coke conveyor belt, which then transports it away.

[0033] The coke conveyor belt is equipped with an electronic belt scale, a high-temperature radiation meter, and an overheating water spray system. The electronic belt scale continuously weighs the coke, and adjusts the amplitude of the electromagnetic vibrating feeder by measuring the deviation between the weighed value and the set value, thereby stabilizing the coke discharge rate. If the high-temperature radiation meter detects that the temperature of the discharged coke exceeds the set upper limit, the water spray system will immediately activate to spray water to cool it down and protect the conveyor belt from high-temperature damage. In addition, dust collection points are provided at the material discharge points at both the head and tail of the conveyor belt, along with belt alignment devices and pull rope switches to ensure the safe and normal operation of the conveyor belt.

[0034] The operating method of the dry quenching double coke rack includes the following steps:

[0035] When a coke removal system malfunctions or experiences a blockage:

[0036] First, close the electric flat gate valve on the faulty side of the upper double-fork trough discharge port of the faulty coke discharge system, and then shut down the vibrating feeder, rotary sealing valve and coke conveyor belt in sequence.

[0037] The second step is to open the electric flat gate valve on the other side of the upper double-fork trough discharge port.

[0038] The third step is to start the backup coke conveyor belt at the bottom of the coke discharge device. The coke conveyor belts should be started gradually from the farthest point to the nearest point.

[0039] Step 4: Start the backup rotary sealing valve. Before starting, the auxiliary equipment of the equipment should be turned on in advance, such as nitrogen and lubrication. After normal operation, start the backup rotary sealing valve and check whether the operation is normal.

[0040] Step 5: After the standby rotary sealing valve is started, start the electromagnetic vibrating feeder of the standby system. Before starting the feeder, it is also necessary to check that its auxiliary equipment, such as coil cooling equipment, is normal. Then start the electromagnetic vibrating feeder to start coke discharge and resume production.

Claims

1. A dry quenching coke double-row coke device, mainly comprising an electric flat gate valve, an electromagnetic vibrating feeder, a rotary sealing valve, a blowing fan, and an automatic lubrication device, characterized in that... The dry quenching coke oven has a double-fork trough discharge port below the bottom feeding port. Each electric flat gate valve is installed above the double-fork trough discharge port. The lower part of the electric flat gate valve and the double-fork trough discharge port are connected to their respective electromagnetic vibrating feeders by flexible connections. The lower part of the electromagnetic vibrating feeders are connected to their respective rotary sealing valves by flexible connections. Each coke conveyor belt is installed below the coke discharge trough of the rotary sealing valve. The sealing nitrogen used by the rotary sealing valve is provided by a purging blower. The rotary sealing valve is equipped with an automatic lubrication device.

2. The dry quenching double-row coke device according to claim 1, characterized in that... The inside of the double-fork trough discharge port is lined with wear-resistant cast iron bricks.

3. The dry quenching double-coke-row device according to claim 1, characterized in that... The nitrogen and lubrication for the two rotary sealing valves are provided by a purge fan and an automatic lubrication device, respectively.

4. The dry quenching double-row coke device according to claim 1, characterized in that... The included angle of the double-fork grooved discharge port is 90°-120°.

5. A dry quenching double-row coke device according to claim 4, characterized in that... The included angle of the double-fork grooved discharge port is 90°.

6. A dry quenching double-row coke device according to claim 1, characterized in that... The coke conveyor belt is equipped with an electronic belt scale, a high-temperature radiation meter, and an overheating water spray device.

7. A dry quenching double-row coke device according to claim 1, characterized in that... The coke conveyor belt is equipped with dust collection points at both the head and tail discharge points, as well as a belt alignment device and a pull rope switch to ensure the safe and normal operation of the conveyor belt.

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