Dust control device for urea storage and packaging system

Abstract

The utility model relates to urea dust treatment technical field, is a kind of urea storage and transportation and packing system dust treatment device, it includes cyclone separator, cloth bag dust collector, emptying cylinder, dust removal fan, cyclone separator import is communicated with dust-containing gas collection header, cyclone separator, cloth bag dust collector, emptying cylinder between respectively through first dust-containing gas conveying pipeline, second dust-containing gas conveying pipeline fixed communication, dust removal fan is fixedly installed on second dust-containing gas conveying pipeline, dust-containing gas collection header import is sequentially fixed communication has scraper conveyor belt, warehouse belt, plow unloader, metering scale, bulk belt, packing machine, bulk loading equipment, cloth bag dust collector import fixed communication has gas purging pipeline.The utility model is reasonable and compact in structure, convenient to use, it is concentrated treatment after being collected to dust-containing gas by setting multiple dust collection points, with safe, labour-saving, simple, efficient characteristics.

Description

Technical Field

[0001] This utility model relates to the field of urea dust treatment technology, and is a dust control device for urea storage, transportation and packaging systems. Background Technology

[0002] A coal chemical company's 600,000-ton-per-year methanol-ammonia co-production project uses local bituminous coal as raw material and adopts multi-nozzle opposed coal-water slurry gasification technology. It is equipped with three multi-nozzle opposed coal-water slurry gasifiers, with two operating and one on standby, producing 300,000 tons of methanol, 300,000 tons of synthetic ammonia (intermediate product), and 520,000 tons of urea per year.

[0003] Urea granules produced by the urea plant are transported by a scraper to the scraper conveyor belt, and then by the scraper conveyor belt to the discharge port on the seventh floor of the packaging building. The urea granules then pass through a chute to the distribution conveyor belt on the fifth floor of the packaging building. Finally, the urea granules are distributed to the urea silo by an electric plow-type unloader, packaged by the packaging machine, and then sent to the finished product warehouse for storage or directly loaded onto trucks. A large amount of urea dust is generated during the processes of scraper collection, belt conveyor transfer, distribution by six electric plow-type unloaders, packaging, and bulk loading of urea granules.

[0004] In the original design, eight dust collectors were installed on the seventh and fifth floors of the packaging building to remove dust from areas prone to dust generation. However, with the gradual increase in urea production capacity and the aging of related equipment and seals in the dust collection system, dust has accumulated on the floors, walls, and equipment surfaces of the fifth, third, and second packaging floors, as well as the south side of the packaging building. The urea dust content in the exhaust gas from the dust collectors in the urea packaging building has exceeded 120 mg / m³. 3 .

[0005] The high dust content inside the packaging building is problematic for two reasons: first, it fails to meet occupational health management regulations for dust at urea packaging sites, impacting the health of operators; second, it does not meet the PM emission concentration standard of Grade A enterprises in the "Implementation Rules for Performance Grading of Key Industries in Heavily Polluted Weather," which stipulates that the PM emission concentration should not exceed 30 mg / m³. 3 The requirements led to coal chemical companies being forced to reduce production when they received heavy pollution weather warnings, which seriously affected output and efficiency. Thirdly, urea dust has a strong corrosive effect on the floors, walls, cable trays and equipment of the urea packaging building, increasing the frequency and cost of maintenance.

[0006] Therefore, it is essential to research and invent a dust control device for urea storage, transportation and packaging systems. Summary of the Invention

[0007] This utility model provides a dust control device for a urea storage, transportation and packaging system, which overcomes the shortcomings of the prior art and can effectively solve the problems of high urea dust content, impact on the health of operators and corrosion of production equipment in the existing urea storage, transportation and packaging process.

[0008] The technical solution of this utility model is achieved through the following measures: a dust control device for a urea storage, transportation and packaging system, including a cyclone separator, a bag filter, an venting cylinder and a dust removal fan. The left inlet of the cyclone separator is fixedly connected to a dust-laden gas collection main pipe. The right outlet of the cyclone separator is fixedly connected to the lower inlet of the bag filter via a first dust-laden gas conveying pipeline. The right outlet of the bag filter is fixedly connected to the inlet of the venting cylinder via a second dust-laden gas conveying pipeline. A dust removal fan is fixedly installed on the second dust-laden gas conveying pipeline.

[0009] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:

[0010] The above also includes a scraper conveyor belt, a hopper belt, a plow-type unloader, a weighing scale, a bulk conveyor belt, a packaging machine, and bulk material loading equipment. The inlet of the dust-laden gas collection main pipe is fixedly connected to a first dust-laden gas collection pipeline, a second dust-laden gas collection pipeline, a third dust-laden gas collection pipeline, a fourth dust-laden gas collection pipeline, a fifth dust-laden gas collection pipeline, a sixth dust-laden gas collection pipeline, and a seventh dust-laden gas collection pipeline. The inlet of the first dust-laden gas collection pipeline is fixedly connected to a scraper conveyor belt. The inlet of the second dust-laden gas collection pipeline is fixedly connected to a hopper belt. The inlet of the third dust-laden gas collection pipeline is fixedly connected to a plow-type unloader. The inlet of the fourth dust-laden gas collection pipeline is fixedly connected to a weighing scale. The inlet of the fifth dust-laden gas collection pipeline is fixedly connected to a bulk conveyor belt. The inlet of the sixth dust-laden gas collection pipeline is fixedly connected to a packaging machine. The inlet of the seventh dust-laden gas collection pipeline is fixedly connected to the bulk material loading equipment of the packaging machine.

[0011] The bottom of the aforementioned cyclone separator is fixedly equipped with a first dust collection tank.

[0012] The upper inlet of the aforementioned bag filter is fixedly connected to a gas purging pipeline, and a control valve is fixedly installed on the gas purging pipeline.

[0013] The bag filter dust collector is equipped with a dust hopper at the bottom. There is one or more dust hoppers, and a second dust collection trough is fixedly installed at the bottom of each dust hopper.

[0014] The above-mentioned distribution belt is fixedly installed with plexiglass walls on both sides, and a belt cleaner is fixedly installed at the end of the distribution belt.

[0015] The above also includes a differential pressure sensor and a PLC controller. The differential pressure sensor is used to measure the pressure difference between the two ends of the bag filter. The differential pressure sensor, control valve, and dust collector fan are all connected to the PLC controller.

[0016] This utility model has a reasonable and compact structure and is easy to use. By setting up multiple dust collection points, the dust-laden gas is collected and then centrally processed through a cyclone separator and a bag filter, ensuring that the dust-laden gas is discharged in compliance with occupational health and environmental protection standards, avoiding corrosion of production equipment, and is characterized by safety, labor saving, simplicity and high efficiency. Attached Figure Description

[0017] Appendix Figure 1 This is a schematic diagram of the process flow of this utility model.

[0018] Appendix Figure 1 The codes in the diagram are as follows: 1 for cyclone separator, 2 for bag filter, 3 for venting cylinder, 4 for dust collector fan, 5 for dust-laden gas collection main pipe, 6 for first dust-laden gas conveying pipeline, 7 for second dust-laden gas conveying pipeline, 8 for scraper conveyor belt, 9 for distribution belt, 10 for plow unloader, 11 for weighing scale, 12 for bulk conveyor belt, 13 for packaging machine, 14 for bulk loading equipment, 15 for first dust-laden gas collection pipeline, 16 for second dust-laden gas collection pipeline, 17 for third dust-laden gas collection pipeline, 18 for fourth dust-laden gas collection pipeline, 19 for fifth dust-laden gas collection pipeline, 20 for sixth dust-laden gas collection pipeline, 21 for seventh dust-laden gas collection pipeline, 22 for first dust collection tank, 23 for gas purging pipeline, 24 for control valve, 25 for ash hopper, 26 for second dust collection tank, 27 for differential pressure sensor, and 28 for PLC controller. Detailed Implementation

[0019] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.

[0020] Unless otherwise specified, all equipment and devices used in this invention are existing, publicly known, and commonly used equipment and devices in the field.

[0021] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0022] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0023] Example 1: As shown in the attached document Figure 1As shown, the dust control device of the urea storage, transportation and packaging system includes a cyclone separator 1, a bag filter 2, an venting cylinder 3, and a dust removal fan 4. The left inlet of the cyclone separator 1 is fixedly connected to a dust-laden gas collection main pipe 5. The right outlet of the cyclone separator 1 is fixedly connected to the lower inlet of the bag filter 2 via a first dust-laden gas conveying pipeline 6. The right outlet of the bag filter 2 is fixedly connected to the inlet of the venting cylinder 3 via a second dust-laden gas conveying pipeline 7. The dust removal fan 4 is fixedly installed on the second dust-laden gas conveying pipeline 7.

[0024] This utility model collects urea dust generated during the transportation, transfer, and packaging of urea finished products through a dust-containing gas collection main pipe 5. The dust is then processed in stages through a cyclone separator 1 and a bag filter 2. After the dust-containing gas meets the standards, it is discharged at a high point through the venting cylinder 3. The urea dust obtained during the processing is collected and sold as urea finished products.

[0025] The dust control device of the above-mentioned urea storage, transportation and packaging system can be further optimized and / or improved according to actual needs:

[0026] Example 2: Its difference from Example 1 is as follows: (See attached) Figure 1 As shown, it also includes a scraper conveyor belt 8, a bin belt 9, a plow-type unloader 10, a weighing scale 11, a bulk conveyor belt 12, a packaging machine 13, and a bulk loading equipment 14. The inlet of the dust-laden gas collection main pipe 5 is fixedly connected to the first dust-laden gas collection pipeline 15, the second dust-laden gas collection pipeline 16, the third dust-laden gas collection pipeline 17, the fourth dust-laden gas collection pipeline 18, the fifth dust-laden gas collection pipeline 19, the sixth dust-laden gas collection pipeline 20, and the seventh dust-laden gas collection pipeline 21. The first dust-laden gas collection pipeline 15... The inlet of the first dust-collecting gas collection pipeline is fixedly connected to a scraper conveyor belt 8; the inlet of the second dust-collecting gas collection pipeline 16 is fixedly connected to a distribution belt 9; the inlet of the third dust-collecting gas collection pipeline 17 is fixedly connected to a plow-type unloader 10; the inlet of the fourth dust-collecting gas collection pipeline 18 is fixedly connected to a weighing scale 11; the inlet of the fifth dust-collecting gas collection pipeline 19 is fixedly connected to a bulk conveyor belt 12; the inlet of the sixth dust-collecting gas collection pipeline 20 is fixedly connected to a packaging machine 13; and the inlet of the seventh dust-collecting gas collection pipeline 21 is fixedly connected to a packaging machine 13 and a bulk loading equipment 14.

[0027] As required, dust removal points are set up in the parts that are prone to dust generation during the conveying and unloading of finished urea. The dust removal points are sealed with 304 stainless steel plates and dustproof soft curtains. The specific locations of the dust removal points are as follows: (1) There is one dust removal point at the discharge port of the scraper conveyor belt 8 on the seventh floor of the urea packaging building; (2) There is one dust removal point at the receiving port of the distribution belt 9 on the fifth floor of the urea packaging building, and one dust removal point at the tail of the distribution belt 9. There are a total of 6 plow unloaders 10, and one dust removal point is set up for each of them; (3) There is one dust removal point for each of the 5 weighing scales 11 on the third floor of the packaging building; (4) There is one dust removal point at the 12th bulk conveyor belt on the third floor of the packaging building; (5) There is one dust removal point for each of the 5 packaging machines 13 on the second floor of the packaging building; (6) There is one dust removal point at the discharge pipe of the bulk loading equipment 14 on the first floor of the packaging building.

[0028] As needed, pneumatic regulating valves can be installed on the first dust-containing gas collection pipeline 15 to the seventh dust-containing gas collection pipeline 21, which are connected to the dust-containing gas collection main pipeline 5, respectively, to control the opening and closing of each pneumatic regulating valve according to the commissioning status of each dust removal point.

[0029] Example 3: Its difference from Examples 1 to 2 is as follows: (See attached) Figure 1 As shown, a first dust collection tank 22 is fixedly installed at the bottom of the cyclone separator 1.

[0030] Example 4: Its difference from Examples 1 to 3 is as follows: (See attached) Figure 1 As shown, a gas purging pipeline 23 is fixedly connected to the upper inlet of the bag filter 2, and a control valve 24 is fixedly installed on the gas purging pipeline 23.

[0031] Example 5: It differs from Examples 1 to 4 in that, as shown in the appendix... Figure 1 As shown, the bottom of the bag filter 2 is provided with a dust hopper 25, and there is one or more dust hoppers 25. The bottom of each dust hopper 25 is fixedly provided with a second dust collection trough 26.

[0032] In this invention, after the dust-laden gas enters the bag filter 2 through the first dust-laden gas conveying pipeline 6, it first passes through the airflow distribution device (such as a perforated plate or guide plate) in the bag filter 2, so that the gas is evenly distributed to each filter bag area. Large dust particles settle directly into the ash hopper 25 due to gravity, and then fall into the second dust collection tank 26 through the ash hopper 25.

[0033] Example 6: Its difference from Examples 1 to 5 is as follows: (See attached) Figure 1 As shown, plexiglass walls are fixedly installed on both sides of the distribution belt 9, and a belt cleaner is fixedly installed at the end of the distribution belt 9.

[0034] Based on the actual site conditions, plexiglass walls are installed on both sides of conveyor belt 9 in the urea packaging building. These walls effectively prevent the spread of urea dust and allow for its collection and treatment within a confined space, ensuring air quality inside the urea packaging building. The plexiglass wall area can be set at 2 × 182 m². 2 The thickness can be set to 4mm, and the wall is supported by a 304 stainless steel structure; a dust removal fan 4 is installed on one side of the plexiglass wall, and the number and installation position of the dust removal fan 4 correspond to the plow-type unloader 10. A DN150 stainless steel vent cylinder 3 is fixedly installed at the outlet of the dust removal fan 4 to vent to the fifth floor of the packaging building. An inspection door is set on the other side of the plexiglass wall.

[0035] Example 7: Its difference from Examples 1 to 6 is as follows: (See attached) Figure 1 As shown, it also includes a differential pressure sensor 27 and a PLC controller 28. The differential pressure sensor 27 is used to measure the pressure difference between the front and rear ends of the bag filter 2. The differential pressure sensor 27, the control valve 24, and the dust collector fan 4 are all connected to the PLC controller 28.

[0036] As needed, control valve 24 can be a pulse control valve, and its opening and closing are controlled by a pulse controller. When the dust layer accumulated on the surface of the filter bag of bag dust collector 2 thickens, causing the pressure difference between the front and back ends of bag dust collector 2 to rise, PLC controller 28 starts control valve 24 to clean the dust. Compressed air is released instantaneously through control valve 24 and gas purging pipeline 23, forming a shock wave that causes the filter bag to expand and vibrate, shaking off the dust.

[0037] Depending on the needs, the pipelines and equipment of the dust control device in this urea storage, transportation, and packaging system may also be equipped with conventional valves, thermometers, and pressure gauges known in the art, according to production requirements. The PLC controller can be a Siemens S7-1500, which is equipped with a Yokogawa CS3000 DCS control system.

[0038] Comparison before and after use: Before use, the dust content in the exhaust gas was greater than 120 mg / m³. 3 After use, approximately 0.4 tons of urea dust can be recovered daily, generating an annual economic benefit of 159,000 yuan; the dust content in the exhaust gas does not exceed 10 mg / m³. 3 The occupational exposure limit for dust in the air inside the urea packaging building shall not exceed 8 mg / m³. 3 .

[0039] The above technical features constitute various embodiments of this utility model, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

[0040] The usage process of this utility model embodiment is as follows: First, the dust-laden gas enters the cyclone separator 1 through the dust-laden gas collection main pipe 5 for preliminary separation to obtain treated dust-laden gas; then, the treated dust-laden gas enters the bag filter 2 for further separation to obtain exhaust gas; finally, the exhaust gas is introduced into the venting cylinder 3 by the dust removal fan 4 and is discharged in compliance with standards.

Claims

1. A dust control device for a urea storage, transportation, and packaging system, characterized in that... It includes a cyclone separator, a bag filter, an venting cylinder, and a dust removal fan. The left inlet of the cyclone separator is fixedly connected to a dust-laden gas collection main pipe. The right outlet of the cyclone separator is fixedly connected to the lower inlet of the bag filter, and the right outlet of the bag filter is fixedly connected to the inlet of the venting cylinder, and a second dust-laden gas conveying pipeline is fixedly connected to the right outlet of the bag filter and the inlet of the venting cylinder. A dust removal fan is fixedly installed on the second dust-laden gas conveying pipeline.

2. The dust control device for a urea storage, transportation, and packaging system according to claim 1, characterized in that... It also includes a scraper conveyor belt, a distribution belt, a plow-type unloader, a weighing scale, a bulk conveyor belt, a packaging machine, and bulk material loading equipment. The inlet of the dust-laden gas collection main pipe is fixedly connected to the first, second, third, fourth, fifth, sixth, and seventh dust-laden gas collection pipelines. The inlet of the first dust-laden gas collection pipeline is fixedly connected to the scraper conveyor belt. The inlet of the second dust-laden gas collection pipeline is fixedly connected to the distribution belt. The inlet of the third dust-laden gas collection pipeline is fixedly connected to the plow-type unloader. The inlet of the fourth dust-laden gas collection pipeline is fixedly connected to the weighing scale. The inlet of the fifth dust-laden gas collection pipeline is fixedly connected to the bulk conveyor belt. The inlet of the sixth dust-laden gas collection pipeline is fixedly connected to the packaging machine. The inlet of the seventh dust-laden gas collection pipeline is fixedly connected to the packaging machine and bulk material loading equipment.

3. The dust control device for a urea storage, transportation, and packaging system according to claim 1 or 2, characterized in that... A first dust collection tank is fixedly installed at the bottom of the cyclone separator.

4. The dust control device for a urea storage, transportation, and packaging system according to claim 1 or 2, characterized in that... The upper inlet of the bag filter is fixedly connected to a gas purging pipeline, and a control valve is fixedly installed on the gas purging pipeline.

5. The dust control device for a urea storage, transportation, and packaging system according to claim 3, characterized in that... The upper inlet of the bag filter is fixedly connected to a gas purging pipeline, and a control valve is fixedly installed on the gas purging pipeline.

6. The dust control device for a urea storage, transportation, and packaging system according to claim 1, 2, or 5, characterized in that... The bottom of the bag filter dust collector is equipped with a dust hopper, and there may be one or more dust hoppers. Each dust hopper is fixedly equipped with a second dust collection trough.

7. The dust control device for a urea storage, transportation, and packaging system according to claim 4, characterized in that... The bottom of the bag filter dust collector is equipped with a dust hopper, and there may be one or more dust hoppers. Each dust hopper is fixedly equipped with a second dust collection trough.

8. The dust control device for a urea storage, transportation, and packaging system according to claim 2, 5, or 7, characterized in that... Acrylic glass walls are fixedly installed on both sides of the distribution belt, and a belt cleaner is fixedly installed at the end of the distribution belt.

9. The dust control device for a urea storage, transportation, and packaging system according to claim 8, characterized in that... It also includes a differential pressure sensor and a PLC controller. The differential pressure sensor is used to measure the pressure difference between the two ends of the bag filter. The differential pressure sensor, control valve, and dust collector fan are all connected to the PLC controller.

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