Design of Ventilation, Dedusting and Boiler Vacuum Cleaning of Coal Handling System in a Power Plant

Design of Ventilation, Dedusting and Boiler Vacuum Cleaning of Coal Handling System in a Power Plant Jiang Mei* (Southwest Electric Power Design Institute, State Power Corporation, 610021) 1. Introduction of the new project of a power plant (4X300 Li) is a national key project of “West to East Electricity Transmission” First, it was established by the joint investment of China Huadian Corporation, Guizhou Zhongshui Energy Development Co., Ltd., and Ganzhou Guizhou Nenghua Co., Ltd.

The overall planning of the power plant is based on a scale of 2400MW. In the current period, 4X300 Lai coal-fired units will be built. The three major hosts are the equipment of the "Oriental" host factory.

At the end of February 2004, the power plant passed a preliminary design review in Guiyang and is currently working on the design of the construction drawings.

2. Overview of Coal System Ventilation, Dust Collection and Vacuum Cleaning System Minutes of the Feasibility Study Report Review Meeting of the Power Plant, Code for Design of Heating Ventilation and Air Conditioning (GBJ19-87) (2001 Edition), Technical Specifications for Design of Thermal Power Plants ( DL5000-2000), "Technical Regulations for Design of Heating Ventilation and Air Conditioning of Thermal Power Plants" (DL/T5035-94) and other regulations and specifications.

2.1 Coal Handling System Dust Removal and Ventilation 2.1.1 Coal Handling System Dust Collection The coal transportation system is a place where dust is more serious. The ventilation and dust removal design of the system is good for improving the working conditions of workers. * Female, born in 1971, engineer, national power It is very important for the company's Southwest Electric Power Design Institute to prevent dust pollution and protect the environment. According to (DL5000-2000), “Technical Specification for Prevention and Control of Coal Dust in Thermal Power Plant Coal Handling System” and “Technical Regulations for Heating Ventilation and Air Conditioning of Thermal Power Plants” (DL/T 5035-94), The coal transportation system of the power plant is subject to the comprehensive management of "prevention-based prevention and control integration." This design will be based on the technical professional equipment sealing, raw coal humidification and hydraulic flushing, on the coal transportation system of the various transshipment points, coal hopper and coal bunker room to set the dust removal equipment, to meet the national standards Harmful Factors Occupational Exposure Limits>> (GBZ 2-2002) and <Hybrid Standards for Design of Industrial Enterprises>> (GBZ1-2002).

The dust extraction and ventilation volume of each coal transfer station is calculated based on the belt width, belt speed, coal drop, and angle of falling coal pipe, or the “Technical Regulations for Heating Ventilation and Air Conditioning of Thermal Power Plants” (DL/T5035-94). Appendix C is selected; the dust extraction and ventilation volume of the coal crusher room is based on the amount of air extraction at the coal discharge point plus the amount of air blown out from the discharge port of the equipment; the dust removal and ventilation volume of the raw coal hopper is based on the “heat and ventilation and air conditioning of the thermal power plant”. Design Technology Specification >> (DL/T5035-94) Appendix E selection. The dust removers of the transfer stations and the coal crusher rooms are all interlocked with the corresponding belt conveyors, and achieve advanced start-up and hysteresis shutdown.

2.1.1.1 Transfer station between coal bunker and dust removal station between original coal hopper and two transfer belts of coal bunker, each set of 1 set of dust removal system, a total of 2 sets, each equipped with a multi-tube impact type with an air flow of 11250m3/h. Dust removal unit. In order to eliminate the methane gas generated in the original coal hopper and the coal dust generated during coal unloading, a set of multi-pipe impact dust removal units with an air flow rate of 5760 m3/h is installed on each of the 16 primary coal hoppers. station. After the dust collector removes the mud water, it is drained to the indoor drainage ditch. The air after the dust removal must be discharged to the outside.

2.1.1.2 Transfer Station Dedusting Dust removal systems at all transfer stations are equipped with multi-pipe impact dust collectors for wet dust removal. One set of dust removal system is installed at the coal drop point of each belt conveyor.

No. 1 transfer station two belt conveyors, each equipped with one multi-channel impact dust removal unit, a total of two, processing three air belt conveyors with an air flow of 5760m3/h2, each with multiple shocks One set of dust removal unit, a total of three units, design air volume of 10,800m3 / h. Above these dust collector dust removal sludge are discharged to the collection station in the transfer station, the air after dust removal must be discharged to the outside.

2.1.1.3 Dust removal of coal crusher The coal crusher of this project is a ring hammer type with coal screen. After calculation, two sets of multi-channel impact dust removal units are installed on each of the two belt conveyors, a total of two sets, and the designed air volume is 24000m/h. The mud water after dust removal is discharged to the sump in the interior of the coal crusher, after dust removal. The air is discharged outside.

In order to better reduce the flying of coal dust, the project has set up an automatic water spray system with a material flow detection device at the outlet of the feed trough of the coal break point of the coal crusher room and each transfer station, a total of nine sets of coal Dust suppression.

2.1.2 Coal Handling System Ventilation The underground part of the car unloading trench, No. 1 transfer station, and No. 2 underground coal transportation gallery are underground structures and the indoor air is relatively humid. Therefore, the number of ventilations is set not less than 15 times per hour. Mechanical ventilation. Ventilation shafts and explosion-proof axial fans are used to vent indoor dusty humid air to improve indoor air quality.

2.2 Vacuum vacuum cleaning system> (DL5000-2000) relevant regulations and requirements, the current project four furnaces share a set of vehicle-mounted negative pressure vacuum devices, each furnace (machine) set a vacuum vacuum cleaning pipe system. The system mainly serves the boiler room *0.000m layer coal mill, the operation layer coal feeder area, the 26.800m layer burner area, the boiler roof large package area, and concurrently the 35.000m coal warehouse belt layer should not be flushed with water. Clean up dust at the site. The main performance parameters of the vehicle-mounted vacuum suction device are shown in the following table.

Equipment Type Performance and Specification Quantity Maximum Vacuum Degree: Vehicle Load Quality: Type Negative Suction Distance: Pressure Vacuum Pump Drive Mode: Independent Engine Suction Vacuum Cleaning Particle Size: Taiwan Dust Filling Capacity: Unit Power: This journal has been translated into Chinese "Sci-tech periodical database" contains the statement in full text to accommodate China's informatization construction and expand the channels for authors' knowledge and information exchange. The journal has been included in the database of Chinese science and technology journals. No. 04-0234. Author's Articles Copyright royalties and payment for this article are paid one time. , free author articles cited statistical analysis data.

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