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LY/T 1659-2020: Technical code of dust prevention and control for wood-based panels industry
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Technical code of dust prevention and control for wood-based panels industry
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LY/T 1659-2020
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Technical regulations for industrial dust control in wood-based panel manufacturing
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Basic data | Standard ID | LY/T 1659-2020 (LY/T1659-2020) | | Description (Translated English) | Technical code of dust prevention and control for wood-based panels industry | | Sector / Industry | Forestry Industry Standard (Recommended) | | Classification of Chinese Standard | B70 | | Classification of International Standard | 79.060 | | Word Count Estimation | 12,194 | | Date of Issue | 2020-03-30 | | Date of Implementation | 2020-10-01 | | Older Standard (superseded by this standard) | LY/T 1659-2006 | | Regulation (derived from) | Announcement No. 6 of 2020 by the State Forestry and Grassland Bureau | | Issuing agency(ies) | State Forestry and Grassland Administration | LY/T 1659-2020: Technical code of dust prevention and control for wood-based panels industry---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Technical code of dust prevention and control for wood-based panels industry
ICS 79.060
B 70
LY
People's Republic of China Forestry Industry Standard
Replace LY/T 1659-2006
Technical specification for dust prevention and control of wood-based panel industry
2020-03-30 released
2020-10-01 implementation
Issued by the State Forestry and Grassland Administration
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard is a revision of LY/T 1659-2006 "Manufacturing Dust Control Regulations for Wood-Based Panel Industry". This standard and LY/T 1659-
2006 revision, except for editorial revisions, the main technical changes are as follows.
--In the scope, non-wood wood-based panels and inorganic wood-based panels, and wood-plastic composite material construction projects only involve wood and plant fibers.
The scope of application of the dimensional dust section or facility (see 1);
--In the normative reference documents, industrial enterprise graphic planning and design, architectural design and fire protection, industrial ventilation design and dust-related fields have been added
Explosion-proof, safety signs and other specifications of the system, as well as the energy-saving and acceptance specifications of the dust removal system, delete the concentration of dust in the air in the workplace
Two reference documents (see 2);
-Added a chapter on terms and definitions (see 3);
- The original standard’s “basic dust-proof rules” were revised to “basic principles”, and the dust-proof principle was revised, and the principle of dust explosion-proof was added.
Then (see 4);
--Combine the "Technical Requirements for Dust Prevention" and "Technical Measures for Dust Prevention" of the original standard into the "Technical Requirements" to incorporate dust prevention and dust removal
Integrate with explosion protection, put forward comprehensive prevention and control technical requirements and measures, and modify corresponding items (see 5);
- Change the original standard "Dust prevention and dust removal equipment management" to "Management requirements", and add the section "Dust prevention and explosion management" (see 6.1),
The section "Equipment Management" is added, and the original standard "Dust removal equipment management" is included in the "Equipment Management".
Management of dust prevention and control of production and auxiliary production equipment (see 6.2);
Please note that certain contents of this standard may involve patents. The issuing organization of this standard does not bear the responsibility for identifying these patents.
This standard was proposed and managed by the National Wood-based Panel Standardization Technical Committee (SAC/TC 198).
Drafting organizations of this standard. Nanjing Forestry University, Daya Wood-based Panel Group Co., Ltd., Yihua Life Technology Co., Ltd., Dongying Zheng
Hemu Industry Co., Ltd., Dehua Rabbit Baby Decoration New Material Co., Ltd., Huzhou Haiqing Wood and Bamboo Technology Co., Ltd., Jiangsu Senmao Bamboo and Wood Industry Co., Ltd.
Co., Ltd., Anhui Yangzi Flooring Co., Ltd., Zhejiang Liangyou Wood Co., Ltd., Huotuopu Yansen (Qingdao) Environmental Equipment Co., Ltd.,
Jiangsu Pinglin Machinery Co., Ltd., Liyang Keda Environmental Protection Machinery Manufacturing Co., Ltd., Liyang Zhongjing Environmental Protection Machinery Co., Ltd., Guangzhou Lihui
Environmental Protection Technology Co., Ltd., Jiangsu Juge Industrial Equipment Co., Ltd., Henan Yongwei Security Co., Ltd., Yiyang City Product Quality Supervision
Inspection and Research Institute, Xuzhou Kailin Wood Machinery Plant.
The main drafters of this standard. Zhou Handong, Ding Tao, Zhou Xihe, Sun Rongjun, Liu Zhuangchao, Huang Qiongtao, Ji Liang, Zhang Xiaowei, Li Haiqing,
Liu Hailiang, Yang Xiaogang, Ge Xiaohai, Yan Fang, Wang Chengming, Zhong Qunwu, Ma Xiaoming, Ma Jinghua, He Jianjun, Xu Jianjun, Ren Taiping, Peng Xia,
Zhang Su.
The previous versions of the standards replaced by this standard are as follows.
--LY/T 1659-2006.
Technical specification for dust prevention and control of wood-based panel industry
1 Scope
This standard specifies the terms and definitions, basic principles, technical requirements and management requirements for dust prevention and control in the wood-based panel industry.
This standard is applicable to the engineering design of new construction, expansion and reconstruction projects (referred to as "construction projects") that produce wood or non-wood wood based panels
And dust prevention and control management during the operation of construction projects. It is also applicable to the production of inorganic wood-based panels and wood-plastic composite materials. Construction projects that only involve wood
And plant fiber dust work section or facility.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document.
For undated references, the latest version (including all amendments) applies to this document.
GB 2894 safety signs and guidelines for their use
GB/T 3840 Technical methods for establishing local air pollutant emission standards
GB 15577-2018 Dust explosion-proof safety regulations
GB 16297 Comprehensive Emission Standard of Air Pollutants
GB/T 17919-2008 Explosion-proof guidelines for dust collectors used in dust explosion hazardous locations
GB/T 18259-2018 Artificial board and its surface decoration terms
GB 50016-2014 Building Design Code for Fire Protection
GB 50019 Design Code for Heating, Ventilation and Air Conditioning
GB 50187-2012 General Layout Design Specification for Industrial Enterprises
GBZ 1-2010 Design Sanitary Standard for Industrial Enterprises
GBZ 2.1 Occupational Exposure Limits for Hazardous Factors in the Workplace Part 1.Chemical Hazardous Factors
AQ 4228 Dust Explosion Safety Specification for Wood Processing System
AQ 4273 Safety Technical Specification for Dust Removal System for Dust Explosion Hazardous Locations
LY/T 1806 Design specification for pneumatic dust removal (transportation) system in wood industry
LY/T 1862 Technical specification for energy saving of pneumatic transportation and dust removal system in wood industry
LY/T 2002 General Rules for Acceptance of Pneumatic Conveying System in Wood Industry
3 Terms and definitions
The following terms and definitions defined in GB/T 18259-2018 apply to this document.
3.1
Wood-based panels
Using wood or non-wood plant resources as raw materials, processing them into various material units, applying (or not applying) adhesives and other additives,
Manufactured plates or molded products.
[Note] Mainly refers to plywood, particle rice, fiberboard, etc.
[GB/T 18259-2018 2.1]
3.2
Wood bulk material
The wood is machined through cutting methods such as planing, milling, sawing, drilling, rotary cutting, sanding, etc., or hammering, impacting, blasting, etc.
Mechanical processing, the solids of different sizes and sizes are mainly produced in flake, strip, rod, fibrous, granular, powder and other shape categories
Bulk material, referred to as shredded material. Scraps include process scraps and associated scraps.
3.3
Bulk raw material
Use special processing equipment to prepare small-diameter wood, branch wood, edge bark, slats, waste wood and other raw materials into wood that meets the process requirements
Material units such as chips, shavings, fibers, etc. Process scraps also include associated scraps that meet process requirements and are used as comprehensive resources.
3.4
Associated scrap processing residue
Scattered wood processing residues, such as shavings, sawdust, sand, produced during the production of furniture, floors, doors and windows, and wood-based panels
Chips such as light powder.
3.5
Wood powder
The particle size is a collective term for a collection of discrete wood material particles below hundreds of microns.
Note. The wood flour in the wood-based panel industry is mainly derived from sanding, grinding, polishing and direct generation of powdery particles and cutting methods such as planing, milling, and drilling.
The powdery particles contained in the scraps, and in the process of completing the conveying, reloading, storage, quantification, sorting, and classification of the scraps, due to the friction between the scraps,
Powdery particles produced by mechanical action such as collision and extrusion.
3.6
Wood dust cloud
The phenomenon that wood powder particles continue to exist in a limited space in a suspended state or in a dispersed motion state, referred to as dust cloud.
In the wood-based panel industry, dust clouds often exist in workplaces and workshops where dust is emitted or leaked, and there are closed production equipment with dust
In the casing and loading and unloading places of the scrap conveyor, inside the silo and dust collector, and in the gas-solid two-phase flow field to complete the drying, sorting, and
In the space of transportation, gas-solid separation and other operations.
Note. According to the hazards of dust clouds, the particle size range for key control is different. In the field of air pollution control and industrial dust removal, the particle size of dust is
The range of 1~100μm; in the field of occupational health, the particle size range is 1μm~10μm; in the field of industrial dust explosion prevention and control, the particle size is less than 500μm.
3.7
Moisture content
The percentage of the mass of moisture contained in the material to the mass of the material, and the ratio of the mass of the absolute dry material and the mass of the wet material are the absolute moisture content and relative
For moisture content.
3.8
Pneumatic conveying
For the purpose of transporting wood craft scraps and associated scraps, using the energy of air or other fluid transport media along a certain
The transportation route transports scraps in steel pipes with a circular cross section, and efficiently separates scraps at the destination.
3.9
Pneumatic dust collecting
For the purpose of dust removal, the dust hood is used to collect the chips and dust discharged from the processing equipment and transport them to the designated place outside the designated workshop
Point, and use a suitable gas-solid separation device or dust collector for efficient separation. Pneumatic dust removal includes the exhaust of pneumatic transportation system
Secondary purification.
3.10
Gas-solid separation device
For the purpose of separation, use the gravity, inertial force, centrifugal force, mechanical filtration, electrostatic, wet, and two or more separation principles of the scrap
In the form of physical combination, a device that separates solid crushed particles from a gas-solid two-phase flow, referred to as a separation device, includes a dust collector.
3.11
Dust remover
For the purpose of air purification, the use of bag or particle layer filtration, electrostatic, wet and other methods to remove the fine wood dust particles in the air
A type of gas-solid separation device for effective separation.
3.12
Hygienic buffer zone
The minimum distance from the boundary of the production unit (production area, workshop or section) that produces occupational harmful factors to the boundary of the residential area. That is
Under normal production conditions, unorganized emission of harmful gases (air pollutants) from the boundary of the production unit to the range of residential areas can meet the requirements of the state
The minimum distance required by the relevant standards for the allowable concentration limit in the residential area.
[GBZ 1-2010, Terms and Definitions 3.7]
3.13
Safety distance
The minimum distance between the facilities to ensure safety, such as the distance of fire prevention, explosion prevention, collision prevention, and anti-skid slope.
[GB 50187-2012, Terms and Definitions 2.0.20]
3.14
Fire separation distance
Prevent the burning building from igniting the adjacent building within a certain period of time, which is convenient for fire fighting.
[GB 50016-2014, Terms and Definitions 2.1.21]
4 basic principles
4.1 It is necessary to adhere to prevention first, combination of prevention and control, coordination of environmental protection and safe production, equal emphasis on technology and management, unification of efficiency and economy,
The basic principle of dust prevention and control of section governance and continuous progress.
4.2 According to the characteristics of production and dust emission, the rules of dust prevention and dust pollution control shall be followed, and dust prevention and explosion prevention and effectiveness shall be adhered to
The principle of synergy with economy.
4.3 According to its production characteristics and the size of the impact space of dust hazards, the dust-related work section first, the whole workshop later, the internal control first, and the later
The dust prevention path of external treatment, and the technical path of dust suppression, dust control, and dust control according to the characteristics and locations of dust generation and emission.
Fully reflect the concept of source governance.
4.4 The principle of green and safe production of dust prevention and explosion protection shall be adhered to.
4.5 The construction project shall give priority to the use of advanced production technology, technology and equipment, eliminate or reduce the generation of dust at the source, and reduce dust
The pollution control load is conducive to improving the utilization rate of wood, while also reducing the risk of dust explosion as much as possible.
4.6 Appropriate new technologies, new processes, new equipment and new methods shall be adopted in a timely manner, continuous improvement of dust prevention work, and continuous improvement of operation and atmosphere
The level of environmental dust pollution control, so as to continue to promote cleaner production.
4.7 The facilities for dust prevention and control shall be designed, constructed and put into use at the same time as the main project.
5 Technical requirements
5.1 Site selection of the factory
5.1.1 The site selection of the plant shall comply with the provisions of GB 50187-2012 and GBZ 1-2010, and shall be based on my country’s current environmental protection and sanitation
And safety production and other laws, regulations, standards and construction projects, pollution and safety production status and overall control level, and occupational health
The hazard status of the factors is determined by comprehensive analysis and evaluation.
5.1.2 In order to minimize the hazards of harmful exhaust gas, dust and other pollutants generated by the construction project, the plant area should be set up in the town and adjacent industry.
The sanitary protection distance between enterprises and residential areas on the upwind side of the smallest frequency wind direction throughout the year and residential areas shall be in line with the current national sanitation of relevant industrial enterprises.
Standard provisions.
5.2 Overall layout of the plant
5.2.1 On the basis of the overall plan, the product and scale, production process, transportation, enterprise development, environmental protection, safety
Requirements for production, occupational health, energy conservation, etc., in accordance with the natural conditions of the site, technical and economic
GB 50187-2012, GBZ 1-2010 and GB 50016-2014 and other countries’ current general planning principles of industrial enterprises, environment
Provisions for protection, occupational health and fire safety.
5.2.2 In order to avoid and reduce the hazards of dust to the working environment, atmospheric environment, and production safety, it is necessary to achieve emission reduction, safety and energy saving.
The target coordinated dust control target, the general layout of the plant area, and should meet the following requirements.
a) The factory area should be clearly functionally partitioned in accordance with GBZ 1-2010; the production area, non-production area and auxiliary production area should be
The location of the layout should comply with the provisions of 5.2.1.4 in GBZ 1-2010; the production management office building should not be set up in the production workshop.
Government office buildings should be located in non-production areas;
b) Under the premise of meeting the needs of the main project, the facilities with severe dust production should be separated from those with lighter dust production, and should comply with GB/T
The relevant regulations of 3840;
c) The arrangement of bulk raw material storage yards that easily emit dust and storage bins with dust explosion hazard shall comply with 5.6.2 of GB 50187-2012
And 5.6.4, it should be arranged on the edge of the factory area, and should be located on the upwind side of the annual minimum frequency wind direction of the factory area, and should be far away from open flames
And the place where the spark is emitted;
d) In order to avoid the second flying of dust in the plant area during the later disposal of associated scraps, and to eliminate the hidden danger of dust explosion, it should be based on
In accordance with the principle of overall planning and step-by-step implementation, the development plan of the whole body should reasonably set up the discharge point of the scrap separation and dust removal device, and provide separation equipment.
Leave enough space and space for the home and dust collector;
e) The arrangement of dry separators and dust collectors for purifying explosive dust should meet the requirements of 9.3.7 in GB 50016-2014.
It will be arranged in an independent, special building (structure) outside the factory building (workshop), and the fire separation distance between its exterior and the factory building shall not be less than 10m
of.
5.3 Plant design
5.3.1 For production sections or areas with large differences in dust emission, building structures should be used for isolation. If there are equipment and pipelines
When passing through the isolated space, the gap between the junction and the building structure should be sealed.
5.3.2 In addition to meeting the requirements of production process and equipment layout, natural ventilation and lighting, the plant design should also include dust removal for the production line
Leave enough space for reasonable arrangement and maintenance of ventilation facilities.
5.3.3 The design of buildings (structures) where process equipment with dust explosion hazard is installed should comply with the relevant buildings (structures) in GB 15577-2018
Building structure design and GB 50016-2014 regulations on explosion-proof plant (warehouse).
5.3.4 The pressure relief facilities set up in the plant with dust explosion hazard parts should meet the requirements of 3.6.3 in GB 50016-2014, and the pressure relief area
Should meet the requirements of 3.6.4 in GB 50016-2014;
5.3.5 In order to avoid secondary explosions due to dust accumulation in the workshop, the ground, wall, roof truss, etc. should be equipped with easy-to-clean dust
Surface and structure.
5.3.6 For the construction section with natural ventilation as the mainstay, the building should have the required height and area, and the top should be provided with a windshield.
5.4 Process design
5.4.1 In the process design, a comprehensive dust prevention and control strategy that combines source dust prevention and facility dust removal, and pollution control and explosion protection shall be adopted.
Slightly, that is, reduce the generation of dust at the source, control the emission of dust and collect the dust source efficiently.
5.4.2 In order to reduce the generation of dust, a process design including the following methods and measures should be adopted.
a) Adopt processing technologies, techniques and equipment that help reduce dust generation;
b) Optimized technological process to reduce the links that are easy to damage, such as the transportation, transfer, and silo storage of loose and broken materials;
c) For the transportation of wet process wood chips and shavings for the purpose of process transport, priority should be given to belt conveyors, bucket elevators, and scrapers
Mechanical transmission equipment such as conveyors and vibrating conveyors;
d) The pneumatic conveying system is used to complete the winnowing, drying, conveying, dosing, sizing and other technological operations of shavings, fibers and other technological scraps
In order to reduce its crushing loss, an economical pneumatic conveying speed should be selected according to the process conditions and the physical properties of the shredded material, and the conveying path should be optimized.
Shorten the conveying distance, and at the same time, reduce the number of elbows under the condition that the process requirements are met. At the same time, the selection should be made in accordance with LY/T 1806
Appropriate elbow radius of curvature;
e) In order to reduce the amount of dust generated during the preparation of process wood chips and shavings, the process operation procedures should include the replacement of knives and grinding, etc.
begging.
5.4.3 In order to control the emission of dust in outdoor workplaces and workshops, a process design including the following methods and measures should be adopted.
a) Effective dust suppression measures should be taken in open-air storage sites of process scraps and raw material transfer loading and unloading locations;
b) The sections or areas with severe dust production in the workshop should be effectively isolated from areas with less dust;
c) For the conveyor that transports dry scraps on the production line, its loading and unloading joints should have good airtight performance, and no dust should be leaked.
Scattered phenomena
d) For belt conveyors with a speed greater than 2 m/s and transporting dry wood scraps, an airtight cover should be installed on the upper part of the working side.
A number of dust suction hoods to prevent dust from flying are arranged on the casing along the length of the conveyor;
e) For belt conveyors that convey scraps (including mesh belt slab conveyors), the cleaning brushes at the discharge drum and on the back side
Dust hood should be provided;
f) When the screw conveyor that transports dry scraps is directly unloading in the workshop, a dust suction hood should be installed near its discharge point;
When unloading outside the workshop, dust suppression measures such as spraying should be taken at the unloading point;
g) The shells of bucket conveyors and scraper conveyors that transport dry scraps should be airtight; when they are directly discharged to subsequent sections,
Dust suction hood should be installed near the point; the loading section and the shell along the transportation direction should be installed to reduce the concentration of dust in the shell
Dust hood
h) For silos storing dry scraps, a closed space should be formed between the equipment for loading and unloading materials to prevent dust from leaking;
When necessary, a dust suction hood should be installed on the top of the silo, avoiding the discharge point, to reduce the concentration of dust clouds in the silo.
i) When the silo is supplied by the gas-solid separation device, it should be supplied through a continuous loading (unloading) valve to avoid the silo from being under positive pressure.
The resulting dust leakage and secondary flying.
j) The production control room should be isolated from the dust-producing area;
k) The working position should be set on the upper side of the dust emission place and natural ventilation, otherwise the personal protection of the operator should be strengthened.
5.4.4 All cutting chips directly produced by processing equipment and dust leakage on the production line should be equipped with pneumatic suction devices to collect and
Treatment, the selection of pneumatic dust removal device should comply with LY/T 1806 regulations.
5.4.5 For process exhaust containing dust, an exhaust purification device should be installed.
5.4.6 After the corresponding dust control measures have been taken according to the requirements of 5.2.1~ 5.4.5, if the dust concentration in the workshop still exceeds GBZ 2.1
The specified occupational exposure limits for hazardous factors in the workplace, and work stations with excessive dust concentrations should be set according to their concentration distribution characteristics...
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