Stable powder collector operation device for coal injection operation area

Abstract

The utility model discloses a stable powder collector operation device for a coal injection operation area, which is characterized in that an air storage tank is respectively connected with a bag powder collector lifting air cylinder and a bag powder collector dust chamber and air purification chamber pulse valve group air pocket through a lifting air cylinder air source main pipe and a pulse air source main pipe, and the lifting air cylinder air source main pipe and the pulse air source main pipe are connected in parallel; the lifting air cylinder air source main pipe is communicated with a bag powder collector lifting air cylinder and provides a power air source for controlling the disconnection and connection of a bag powder collector dust chamber air purification chamber and a bag powder collector air chamber; the pulse air source main pipe is communicated with an air pocket of a pulse valve group of a dust chamber and an air purifying chamber of the bag-type dust collector, and provides a power deashing air source for the bag-type dust collector; an orifice plate flowmeter and a pneumatic cut-off valve are arranged on a main pipeline of the pulse gas source; and a main exhaust fan for exhausting waste gas is arranged on the air chamber of the cloth bag powder collector and is connected with the air chamber of the cloth bag powder collector. The device is high in working efficiency, high in automation degree, accurate and reliable, and ensures the stable continuity of production of a coal pulverizing system and nitrogen for injection.

Description

Technical Field

[0001] This utility model relates to the field of pulverized coal injection technology, and in particular to a stable pulverizer operating device for pulverized coal injection operation areas. Background Technology

[0002] Pulverized coal injection (PCI) technology in blast furnaces replaces coke in providing heat and reducing agent for ironmaking, thereby reducing the coke ratio and pig iron costs. It is a crucial aspect of optimizing the ironmaking system structure. In daily production, the pulverizing system in the PCI area has a series connection between the pulse gas source of the bag filter and the gas source of the lifting cylinder. If the pulse component of the bag filter malfunctions, the nitrogen pressure in the lifting cylinder drops below 0.4 MPa, causing the entire bag filter to fall during production. This disrupts the continuous and stable operation of the pulverizing system. Pulverized coal falls back through the riser pipe and overflows in large quantities through the sealed coal feeder and mill slag discharge port, polluting the environment. In severe cases, it can cause the bag filter to collapse, requiring prolonged downtime for maintenance. Increased bag permeability shortens the bag's lifespan, and dust concentration at the discharge port exceeds standards, failing to meet environmental regulations. Simultaneously, it causes a drop in system nitrogen pressure, affecting the injection and vulcanization pressing and causing coal pressure pulsation, thus hindering the stability of the blast furnace operation. Summary of the Invention

[0003] In order to overcome the above-mentioned problems in the prior art, this utility model proposes a stable coal collector operating device for pulverized coal injection operation areas.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a stable dust collector operating device for pulverized coal injection operation area, including an air storage tank and a bag dust collector. The air storage tank is connected to the lifting cylinder of the bag dust collector and the pulse valve group air tank of the dust chamber and clean air chamber of the bag dust collector through the lifting cylinder air source main pipe and the pulse air source main pipe respectively. The lifting cylinder air source main pipe and the pulse air source main pipe are connected in parallel. The lifting cylinder air source main pipe is connected to the lifting cylinder of the bag dust collector to provide a power air source for controlling the disconnection and connection between the dust chamber and clean air chamber of the bag dust collector and the air chamber of the bag dust collector. The pulse air source main pipe is connected to the pulse valve group air tank of the dust chamber and clean air chamber of the bag dust collector to provide a power air source for cleaning dust from the bag dust collector. An orifice plate flow meter and a pneumatic shut-off valve are installed on the pulse air source main pipe. A main exhaust fan for discharging waste gas is installed on the air chamber of the bag dust collector.

[0005] The aforementioned stable coal collector operating device for pulverized coal injection operation area is provided with a lifting cylinder air source manual valve, a first pressure reducing valve, and a first flow meter on the lifting cylinder air source main pipe.

[0006] The aforementioned stable coal collector operating device for pulverized coal injection operation area is provided with a pulse gas source manual valve, a second pressure reducing valve, and a second flow meter on the pulse gas source main pipe.

[0007] The aforementioned stable coal collector operating device for pulverized coal injection operation area includes a gas source pressure gauge installed on the gas storage tank.

[0008] The aforementioned stable dust collector operating device for pulverized coal injection operation area is further provided with a pipeline connected to the dust collection hopper of the bag filter on the main pulse gas source pipe, and a nitrogen filling valve is provided on the pipeline connected to the dust collection hopper of the bag filter.

[0009] The aforementioned stable coal collector operating device for pulverized coal injection operation areas includes a pneumatic shut-off valve connected to a solenoid valve and an explosion-proof control box.

[0010] The beneficial effects of this utility model are: (1) High working efficiency. When the pulse valve fails and a large amount of nitrogen leaks from the gas bag of the pulse valve group, the nitrogen flow rate increases and the pressure drops. The pneumatic shut-off valve on the pulse gas source pipeline automatically makes a rapid shut-off response to avoid the lifting cylinder from being unable to move. Due to the low nitrogen pressure, the lifting cylinder rod and the large cover close the channel between the dust chamber and the clean air chamber of the bag dust collector and the air chamber of the bag dust collector, causing the production of the powder making system to be interrupted and affecting the spraying quality.

[0011] (2) High automation: When the pressure of the gas storage tank is lower than 0.4 MPa, the pneumatic shut-off valve of the pulse gas source main pipe will be automatically closed to ensure that the gas used by the lifting cylinder keeps the inlet and outlet channels of the powder collector unobstructed.

[0012] (3) The main pulse air source pipe and the main lifting cylinder air source pipe are changed from series to parallel. When the pulse system fails, it is only necessary to cut off the air source of the pulse valve group air bag, which will not affect the air supply of the lifting cylinder and the air supply of the jet.

[0013] (4) After the pulse system fault is resolved, the operator can directly click the interlock input.

[0014] This utility model offers comprehensive advantages in terms of high real-time monitoring, high working efficiency, high automation, and high accuracy and reliability. It avoids production safety accidents such as main exhaust fan power failure, coal powder spillage, interruption of continuous pulverizing production, and box collapse during the pulverizing system production process. It also avoids pollution caused by coal powder spillage, the probability of pneumoconiosis infection, the danger of dust explosion, and nitrogen waste. It ensures the stable and continuous production of the pulverizing system and the supply of nitrogen for injection. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the present invention.

[0016] The components include: 1. Air storage tank; 2. Lifting cylinder air supply main pipe; 3. Pulse air supply main pipe; 4. Pneumatic shut-off valve; 5. Orifice plate flow meter; 6. Nitrogen filling valve; 7. Bag dust collector lifting cylinder; 8. Bag dust collector air chamber; 9. Bag dust collector dust chamber; 10. Main exhaust fan; 11. Lifting cylinder air supply manual valve; 12. First pressure reducing valve; 13. First flow meter; 14. Pulse air supply manual valve; 15. Second pressure reducing valve; 16. Second flow meter; 17. Pulse valve; 18. Pulse valve assembly air tank; 19. Bag pulse backflush pipe; 20. Lifting cylinder pull rod; 21. Bag dust collector dust chamber clean air chamber; 22. Bag dust collector dust collection hopper; 23. Lifting cylinder large cover. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] like Figure 1 As shown, this embodiment discloses a stable dust collector operating device for a pulverized coal injection operation area, including an air storage tank 1 and a baghouse dust collector. The air storage tank 1 is connected to the baghouse dust collector lifting cylinder 7 and the pulse valve group air manifold 18 via a lifting cylinder air source main pipe 2 and a pulse air source main pipe 3. The lifting cylinder air source main pipe 2 and the pulse air source main pipe 3 are connected in parallel. The lifting cylinder air source main pipe 2 is connected to the baghouse dust collector lifting cylinder 7, providing a power air source for controlling the disconnection and connection between the dust chamber clean air chamber and the baghouse dust collector air chamber. The pulse air source main pipe 3 is connected to the pulse valve group air manifold 18 located in the dust chamber clean air chamber 21 of the baghouse dust collector, providing a power air source for the pulse valve 17 pulse cleaning. An orifice plate flow meter 5 and a pneumatic shut-off valve 4 are installed on the pulse air source main pipe connected to the baghouse dust collector pulse valve group air manifold 18. The baghouse dust collector air chamber 8 is connected to the main exhaust fan 10. In this embodiment, the air storage tank is a nitrogen air storage tank.

[0019] The advantage of setting the lifting cylinder air supply main pipe 2 and pulse air supply main pipe 3 in parallel is that when the pulse valve fails and a large amount of nitrogen leaks from the pulse valve group air tank 18, the nitrogen flow rate increases and the pressure drops. The pneumatic shut-off valve 4 on the pulse air supply pipeline automatically makes a rapid shut-off response to prevent the lifting cylinder from failing to operate. Due to the low nitrogen pressure, the lifting cylinder pull rod 20 and the lifting cylinder cover 23 close the channel between the dust chamber clean air chamber 21 of the bag filter and the air chamber 8 of the bag filter, causing the powder making system to be interrupted. The nitrogen storage tank pressure is too low, which seriously affects the spraying quality.

[0020] In this embodiment, the lifting cylinder air source main pipe is equipped with a lifting cylinder air source manual valve 11, a first pressure reducing valve 12, and a first flow meter 13; the pulse air source main pipe is equipped with a pulse air source manual valve 14, a second pressure reducing valve 15, and a second flow meter 16.

[0021] To improve control accuracy and ensure safety, in this embodiment, the pneumatic shut-off valve 4 is connected to a solenoid valve and an explosion-proof operating box, enabling both remote and local control. A pressure gauge is installed on the gas storage tank. Furthermore, to prevent spontaneous combustion of coal dust inside the dust collector, the pulse gas source main pipe is also equipped with a pipeline connected to the dust collection hopper 22 of the baghouse dust collector. A nitrogen filling valve 6 is installed on the dust collection hopper 22 of the baghouse dust collector for nitrogen inerting.

[0022] This utility model device can be realized by simple modification on the basis of existing powder making device. The modification points include: 1. Connecting a DN25mm manual ball valve and a pressure reducing valve (i.e., the lifting cylinder air source manual valve 11 and the first pressure reducing valve 12 in this embodiment) after the manual valve of the nitrogen storage tank outlet pipeline.

[0023] 2. After connecting to the top of the bag filter with a DN25mm seamless pipe, the air is distributed to the lifting cylinder, thus changing the series connection of the pulse air source and the lifting cylinder air source to a parallel connection.

[0024] 3. Install a pneumatic shut-off valve 4 in the intermediate pipeline from the pulse gas source main pipe to the nitrogen storage tank, and connect it to the host computer in the main control room.

[0025] 4. Install an orifice plate flow meter in the horizontal section of the pulse gas source main pipe.

[0026] 5. Connect the pneumatic shut-off valve 4 to the air source, solenoid valve, and explosion-proof control box.

[0027] The specific modification process is as follows: 1. The modification is carried out during the pulverized coal injection maintenance time. Before the modification, the nitrogen in the nitrogen storage tank is emptied and the pressure gauge of the tank is reduced to 0 MPa.

[0028] 2. Release the pressure in the gas storage tank and pipeline, and close the manual valve at the outlet of the gas storage tank.

[0029] 3. Obtain the maintenance work permit and hot work permit.

[0030] 4. The operator uses a handheld CO and O2 alarm to monitor the gas at the gas storage tank. The monitoring standard is CO < 24 ppm and O2 content between 19.5% and 21%. Once the gas monitoring meets the standards, the maintenance worker can issue the relevant invoice to implement the modification.

[0031] 5. Maintenance workers shall carry out construction work under the supervision of a safety officer. This includes cutting pipes, installing orifice flow meters, pneumatic shut-off valves, manual ball valves, pressure reducing valves, and welding pipes.

[0032] 6. Once all the renovation work is completed, proceed with the pressure testing and leak detection.

[0033] In this embodiment, when the pulse gas source main pipe malfunctions, causing an increase in nitrogen flow or a decrease in pressure, the system's pneumatic shut-off valve automatically reacts to prevent the lifting cylinder from failing to operate, thus avoiding production interruption in the pulverizing system and affecting the spraying quality. It features a high degree of automation; when the nitrogen main pipe pressure drops below 0.4 MPa, the pulse gas source main pipe pneumatic shut-off valve automatically closes, ensuring that the lifting cylinder's air supply keeps the inlet and outlet channels of the powder collector unobstructed.

[0034] This embodiment discloses a stable dust collector operating device for pulverized coal injection areas. It utilizes a newly modified parallel lifting cylinder air source main pipe to address the impact of pulse system failures and nitrogen pressure drops on the continuity of the pulverizing system and the quality of the injection. A newly added pneumatic shut-off valve interlocking system automatically controls the pulse system's operating status, reducing nitrogen waste and its impact on injection quality. This device is also applicable to various offline dust collectors, ensuring their operational efficiency.

[0035] The above embodiments are merely exemplary embodiments of this utility model and are not intended to limit this utility model. Those skilled in the art can make various modifications or equivalent substitutions to this utility model within its substance and protection scope, and such modifications or equivalent substitutions should also be considered to fall within the protection scope of this utility model.

Claims

1. A stable dust collector operating device for pulverized coal injection operation areas, comprising an air storage tank and a bag dust collector, characterized in that, The air storage tank is connected to the lifting cylinder of the bag filter and the pulse valve group air tank of the dust chamber and clean air chamber of the bag filter through the lifting cylinder air source main pipe and the pulse air source main pipe. The lifting cylinder air source main pipe and the pulse air source main pipe are connected in parallel. The lifting cylinder air source main pipe is connected to the lifting cylinder of the bag filter, providing a power air source for controlling the disconnection and connection between the dust chamber and clean air chamber of the bag filter and the air chamber of the bag filter. The pulse air source main pipe is connected to the pulse valve group air tank of the dust chamber and clean air chamber of the bag filter, providing a power air source for cleaning the bag filter. An orifice plate flow meter and a pneumatic shut-off valve are installed on the pulse air source main pipe. A main exhaust fan for discharging waste gas is connected to the air chamber of the bag filter.

2. The stabilizing dust collector operating device for a pulverized coal injection area according to claim 1, characterized in that, The lifting cylinder air supply main pipe is equipped with a lifting cylinder air supply manual valve, a first pressure reducing valve, and a first flow meter.

3. The stabilizing dust collector operating device for a pulverized coal injection area according to claim 1, characterized in that, The lifting cylinder air supply main pipe is equipped with a pulse air supply manual valve, a second pressure reducing valve, and a second flow meter.

4. The stabilizing dust collector operating device for a pulverized coal injection area according to claim 1, characterized in that, The gas storage tank is equipped with a gas source pressure gauge.

5. The stabilizing dust collector operating device for a pulverized coal injection area according to claim 1, characterized in that, The pulse gas source main pipe is also equipped with a pipeline connected to the dust collection hopper of the bag filter dust collector, and a nitrogen filling valve is installed on the pipeline connected to the dust collection hopper of the bag filter dust collector.

6. The stabilizing dust collector operating device for a pulverized coal injection area according to claim 1, characterized in that, The pneumatic shut-off valve is connected to a solenoid valve and an explosion-proof control box.

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