This standard specifies the basic requirements for dust explosion prevention in tobacco processing systems. This standard applies to the design, construction, operation and management of dust explosion prevention in tobacco processing systems. GB 18245-2000 Safety regulations for dust explosion prevention in tobacco processing systems GB18245-2000 Standard download decompression password: www.bzxz.net

GB 18245---2000
This standard is compiled based on the current safety regulations for dust explosion prevention and other relevant safety standards in my country and combined with the actual situation of tobacco processing systems.
Appendix A of this standard is a reminder appendix.
This standard is proposed by the Work Safety Bureau of the State Economic and Trade Commission of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Dust Explosion Prevention Standardization. The drafting units of this standard are: State Tobacco Monopoly Administration, Safety and Environmental Protection Research Institute of the Ministry of Metallurgy, Beijing Cigarette Factory, Shandong Provincial Tobacco Monopoly Administration, Shijiazhuang Copper and Aluminum Products Factory.
Main drafters of this standard: Lu Yanhua, Zhang Yifeng, Zhou Hao, Yang Shuangyi, Liu Xiaoxing, Xu Dongjin 161
1 Scope
National Standard of the People's Republic of China
Tobacco Processing System
Safety Regulation for Dust Explosion Prevention
Safety Regulation for Dust Explosion in Tobacco Processing System This standard specifies the basic requirements for dust explosion prevention in tobacco processing systems. This standard applies to the design, construction, operation and management of dust explosion prevention in tobacco processing systems. 2 Referenced standards
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GB18245--2000
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB12476.1-1990 Explosion-proof electrical equipment for explosive dust environments Dust explosion-proof electrical equipment GB15577--1995 Dust explosion safety regulations GB/T15604--1995 Dust explosion terminology
GB/T15605--1995 Dust explosion pressure relief guide (GB/T17919-1999 Explosion-proof guide for dust collectors in dust explosion hazardous areas
GB50057---1994 Lightning protection design code for buildings GB50058--1992 Design code for electrical installations in explosive and fire hazardous environments GBJ16--1987 Code for fire protection design of buildings
3 Definitions
This standard adopts the following definitions.
3.1 Tobacco processing system tobacco processing system is the general term for the production process of tobacco leaves into finished tobacco products. It includes the production processes of tobacco leaf primary processing, leaf threshing, shredding, tobacco shred expansion, thin sheet processing and rolling.
3.2 Dust explosion prevention and protection The technology of preventing dust explosion and reducing the degree of harm after dust explosion occurs. 3.3 Dust cloud cloud
Dust is suspended in the air or gaseous oxidant to form a high-concentration mixture of dust and gas. 4 General provisions
4.1 All newly built, expanded, and renovated tobacco processing systems (hereinafter referred to as "systems") shall be subject to dust explosion-proof design, construction, and final acceptance in accordance with this standard; systems that have been built and are in operation shall be gradually rectified in accordance with the requirements of this standard while ensuring safety. 4.2 The person in charge of the enterprise shall be aware that tobacco dust is explosive and understand the work sites and working conditions of the dust explosion hazardous areas of the enterprise. Approved by the State Administration of Quality Supervision, Inspection and Quarantine on October 27, 2000 162
Implementation on May 1, 2001
The explosion characteristic parameters of tobacco dust are shown in Appendix A. GB 18245—2000
4.3 The person in charge of the enterprise shall formulate detailed implementation rules and safety checklists for dust explosion prevention based on this standard and the actual situation of the enterprise. 4.4 Personnel participating in system operation shall first receive safety training organized by the enterprise containing dust explosion prevention content, be familiar with relevant safety knowledge, and pass the examination before being allowed to take up their posts.
4.5 Dust cleaningWww.bzxZ.net
4.5.1 A regular cleaning system should be established.
4.5.2 When cleaning, it is advisable to use a cleaning method that does not cause dust to fly. 4.6 Prevent spontaneous combustion
4.6.1 During shutdown and maintenance, no tobacco (stem) shreds and their dust should be stored in all production equipment. 4.6.2 The temperature of tobacco shreds stored in the shred storage cabinet should be monitored. 4.7 Prevent overheating of equipment surface
When tobacco shredding equipment is in operation, its surface temperature should not exceed 110C. 4.8 Prevent open flames
4.8.1 Non-productive open flames are not allowed in rooms and production workshops. 4.8.2 When performing hot work, it should be carried out in accordance with Article 5.2.1 of GB15577-1995. 4.9 Fire extinguishing
4.9.1 Fire extinguishing methods that can raise deposited dust to form dust clouds should not be used. 4.9.2 When using a fire extinguisher to extinguish a fire, a fire extinguisher with good atomization effect of the extinguishing agent should be used. 4.9.3 Fire extinguishing facilities and fire extinguishing equipment should be kept in effective working condition and available at any time. 4.9.4 A fire extinguishing plan should be formulated.
4.10 The enterprise shall conduct safety inspections regularly according to the safety inspection form. 5 Structure and layout of buildings (structures)
5.1 According to GBJ16--1987, tobacco processing is a fire hazard of Class C production. 5.2 The fire resistance level, number of floors, floor area, fire separation, explosion-proof design, safe evacuation, etc. of the factory building shall be implemented in accordance with the relevant provisions of Chapter 3 of GBJ16---1987.
5.3 The dust removal room should be set up separately and located outside the production plant; if conditions are limited, it can also be set up in the production plant, but it should be explosion-proof and isolated from other production equipment, and pressure relief measures should be taken in accordance with Chapter 4 of GB/T15605-1995. 6 Power design
6.1 The dust removal room is divided into 11 zones according to GB50058-1992, and its power design should be implemented in accordance with the relevant provisions of Chapter 3 of GB50058-1992.
6.2 All electrical equipment in dust-generating places shall comply with the requirements of GB12476.1. 6.3 Lightning protection design of buildings (structures) shall be implemented in accordance with the relevant provisions of GB50057. 7 Process equipment
7.1 Leaf threshing equipment
7.1.1 Magnetic separation and other cleaning devices shall be installed at the raw material entrance of leaf threshing equipment to remove metal objects. 7.1.2 Leaf threshing equipment shall not cause friction or collision between the threshing machine and the frame. If such phenomenon occurs, the machine shall be stopped immediately for repair. 7.1.3 Leaf threshing equipment shall have good airtightness. 7.1.4 The main body of leaf threshing equipment shall be equipped with a separate dust removal system. 7.2 Wire cutting equipment
7.2.1 All types of wire cutting equipment shall have their knife doors sealed and be equipped with suction hoods connected to the dust removal system. 163
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7.2.2 Magnetic separation and other cleaning devices should be installed at the raw material entrance to remove metal debris. 7.2.3 All kinds of bearings in the rotary cutter and feeding transmission parts should be sealed. 7.3 Broken leaf processing equipment
7.3.1 Each dust-generating point of the broken leaf processing equipment should be sealed with a cover and connected to the dust removal system. 7.3.2 The tape joints for conveying tobacco leaves should not be connected with metal buckles. 7.4 Thin sheet system
7.4.1 The crusher, blending and mixing inlet, etc. in the thin sheet system should be equipped with a magnetic separation device, and should be sealed or equipped with a dust hood. 7.4.2 The sealing facilities or dust hoods should be connected to an independent dust removal system. 7.4.3 The design of the dust removal system should be carried out in accordance with Chapter 8 of this standard. 7.4.4 The heating plate (wire) of the electric heating equipment should be equipped with thermal insulation materials on the outside and its surface temperature should not exceed 110℃. 7.5 Cigarette equipment
7.5.1 The discharge port of cigarette equipment should be equipped with a dust hood and connected to an independent dust removal system. 7.5.2 The design of the dust removal system shall be carried out in accordance with Chapter 8 of this standard. 7.6 Pneumatic conveying
7.6.1 Pneumatic conveying pipelines shall be made of metal materials. 7.6.2 Pneumatic conveying pipelines should not pass through building firewalls. If they pass through building firewalls, corresponding fire prevention measures should be taken. 7.6.3 A switch that can stop pneumatic conveying should be set up in the production workshop. 7.7 Other dust-producing process equipment should take dust explosion prevention measures in accordance with the above-mentioned equipment. 8 Ventilation and dust removal system
8.1 Layout
8.1.1 The dust removal system should be reasonably combined into several independent systems according to the dust source. 8.1.2 Each independent dust removal system should have a separate dust removal room. 8.1.3 Different explosion prevention measures can be designed for each independent dust removal system according to actual conditions. 8.2 Pipeline network design
8.2.1 Pipes should be made of metal materials
8.2.2 No end caps or bag-shaped pipes should be set on the pipeline to avoid dust accumulation. 8.2-3 Pressure relief devices should be set at the bends of the pipeline network and the entrance of the dust collector in accordance with GB/T15605. 8.2.4 Automatic fire dampers should be installed at the connection between each ventilation and dust removal branch and the main return air duct. 8.3 Air volume design
The wind speed in the pipeline should be strictly controlled to ensure that there is no dust deposition in the air duct. 8.4 Dust Collector
The modeling, operation and maintenance of the dust collector shall be carried out in accordance with GB/T17919. 8.5 Fan
Ensure that the fan is located after the last dust collector and select the DP type. 8.6 Dust Collection Processing
8.6.1 The dust should be cleaned every shift
8.6.2 The cleaned dust should be stored in a fixed place outside the dust removal room. 164
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Appendix A
(Suggestive Appendix)
Tobacco Dust Explosion Characteristic Parameters
Since tobacco dust is an organic dust, its explosion characteristic parameters are affected by its origin, moisture, particle size and season, so the test results of each unit are different. The test results of some scientific research units are shown in Table A1. Table A1 Tobacco dust explosion characteristic parameters
Dust cloud lowest dust layer lowest
Testing unit
Nordic Dust Explosion Test Laboratory
British Fire Research Institute
U.S. Bureau of Mines
Northeastern University
Institute of Mechanics, Chinese Academy of Sciences
(Sampling from Beijing Cigarette Factory)
Ignition temperature
Note: a) The median diameter of the powder sample is 15.1μm. b) The median diameter of the powder sample is 36.5μm.
c) The median diameter of the powder sample is 51.9μm.
d) The median diameter of the powder sample is 57.8μm.
Ignition temperature
Minimum dust cloud
Ignition energy
>1 200
16～24
Dust cloud explosion
Lower concentration
10.1～68
10～20
10～20
10～20
Maximum dust cloud
Explosion pressure
Maximum pressure
Rise rate
MPa-(m/s)
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