Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is jointly revised by China National Textile and Apparel Council and China Kunlun Contracting & Engineering Corporation in conjunction with relevant units in accordance with the requirements of the Development and revision plan on engineering construction standards and codes in 2016 (JIANBIAOHAN [2015] No. 274) issued by the Ministry of Housing and Urban-Rural Development of the People's Republic of China.
In the process of revision, with extensive investigation and research, the standard preparation team has carefully summarized the engineering construction experience, technological progress, energy conservation and consumption reduction achievements of nylon plants in China in recent years, as well as the experience and lessons in environmental protection and occupational safety and health, absorbed the scientific and technological achievements of new nylon production technology at home and abroad, and widely solicited the opinions of experts in the production, design and scientific research of nylon plants. Therefore, the technical content and technical standards were revised and supplemented, which were reviewed and finalized after repeated discussion and modification.
The main technical contents of this standard include: general provisions, terms and symbols, process design, polymerization equipment and layout, spinning and after-treatment equipment and layout, process pipeline design, auxiliary production facilities, automatic control and instrument, electrical and telecommunications, general layout transportation, architecture and structure, water supply and drainage, heating, ventilation and air-conditioning, environmental protection, occupational safety and health, etc.
The main technical contents of this standard are revised as follows: 1. The title of the standard is modified to "Standard for design of polyamide polymer and fiber plant"; 2. The scope of application of the "General Provisions" is modified; 3. Clauses/Sub-clauses such as environmental protection, occupational safety and health, etc. are added; 4. The relevant requirements of batch polymerization process of nylon 56, which has been industrialized in China in recent years, are added; 5. Some energy saving and consumption reduction indexes are modified; 6. Some provisions of various professions are modified.
The Ministry of Housing and Urban-Rural Development is in charge of this standard, China National Textile and Apparel Council is responsible for the routine management, and China Kunlun Contracting & Engineering Corporation is responsible for the explanation of specific technical contents. During the process of implementing this standard, you are kindly requested to send your opinions and advice (if any) to China Kunlun Contracting & Engineering Corporation (Address: No. 21, Zengguang Road, Haidian District, Beijing, 100037, China)
Standard for design of polyamide polymer and fiber plant
1 General provisions
1.0.1 This standard is formulated with a view to standardizing the design of polyamide polymer and fiber plants and achieving advanced technology, economic rationality, safety and reliability, energy conservation and environmental protection, and clean production.
1.0.2 This standard is applicable to the design of new construction, renovation and extension projects of polyamide chip plants and polyamide fiber plants with caprolactam (CPL), hexamethylene diamine adipate (AH salt) or hexamethylene diamine adipate as raw materials, or its polymer chips (polyamide 6 chips, polyamide 66 chips and polyamide 56 chips), including twisting, weaving and dipping workshops for the after-treatment of polyamide filament for industry, excluding polyamide 56 continuous polymerization and melt direct spinning process. This standard is not applicable to plant design of aromatic polyamide fibers.
1.0.3 The design of polyamide polymer and fiber plants shall meet the relevant requirements of project environmental impact assessment report, occupational safety and health assessment report, energy assessment report, etc.
1.0.4 For the design of polyamide polymer and fiber plants, it is necessary to adjust measures according to local conditions, carefully investigate and study, collect data, actively adopt mature new technologies, new processes, new equipment and new materials, conduct technical and economic comparison of multiple schemes, and select the best to determine the engineering design scheme.
1.0.5 In addition to this standard, the design of polyamide polymer and fiber plants shall also comply with the requirements of the current relevant standards of the nation.
2 Terms and symbols
2.1 Terms
2.1.1
polyamide fiber plant and polyamide polymer plant
plants for producing polyamide domestic filaments, staple fibers, filaments for industry, bulked continuous filaments (BCF) and monofilaments from caprolactam (CPL) or its polymer polyamide 6 chips, or from nylon 66 salt (AH salt) or its polymer polyamide 66 chips, or from hexamethylene diamine adipate or its polymer polyamide 56 chips; and plants for producing polyamide 6 chips from caprolactam (CPL), polyamide 66 chips from nylon 66 salts (AH salts), or polyamide 56 chips from hexamethylene diamine adipate.
2.1.2
polyamide 6 fiber; nylon 6 fiber
fiber made from polyamide 6 chips by melt spinning process including domestic filament, staple fiber, filament for industry, bulked continuous filament (BCF) and monofilament, also known as nylon 6 fiber or polyamide 6 fiber, generally called nylon 6 in China
2.1.3
polyamide 66 fiber; nylon 66 fiber
fiber made from nylon 66 salt (AH salt) or its polymer polyamide 66 chips by melt spinning process including domestic filament, staple fiber, filament for industry, bulked continuous filament (BCF) and monofilament, also known as nylon 66 fiber or polyamide 66 fiber, generally called nylon 66 in China
2.1.4
polyamide 56 fiber
fiber made from hexamethylene diamine adipate or its polymer polyamide 56 chips by melt spinning process including domestic filament, staple fiber, filament for industry, bulked continuous filament (BCF) and monofilament, also known as nylon 56 fiber or polyamide 56 fiber, generally called nylon 56 in China
2.1.5
polyamide 6
high molecular weight polymer prepared from caprolactam (CPL) by ring opening polymerization, also known as nylon 6
2.1.6
polyamide 66
high molecular weight polymer prepared from adipic acid and hexanediamine by salt formation (AH salt) and polycondensation reaction, also known as nylon 66
2.1.7
polyamide 56
high molecular weight polymer prepared from adipic acid and pentylenediamine by salt formation (polyamide 56 salt) and polycondensation reaction, also known as nylon 56
2.1.8
hexamethylene diamine adipate; nylon 66 salt
intermediate formed by the reaction of adipic acid and hexanediamine in a medium, which may be a crystalline solid or a salt solution, also known as nylon 66 salt
2.1.9
hexamethylene diamine adipate; nylon 56 salt
intermediate formed by the reaction of adipic acid and pentylenediamine in a medium, which may be a crystalline solid or a salt solution, also known as nylon 56 salt
2.1.10
polyamide spinning
process of extruding the melt of polyamide 6, or polyamide 66, or polyamide 56 from the pores of the spinneret continuously, quantitatively, and evenly with a spinning metering pump to form a melt trickle, which is cooled, solidified, and formed, and then oiled, drawn, winded, and spooled into a drum or strip
2.1.11
melt direct spinning process
spinning process in which polyamide 66 or polyamide 56 melt in the polymerization reactor is used as raw material, and polyamide 66 melt or polyamide 56 melt is directly sent to the spinning box through the melt pump for spinning
2.1.12
polyamide chips spinning process
spinning process that takes polyamide 6 chips, polyamide 66 chips or polyamide 56 chips as raw materials, heats and melts the dried chips or dry chips in a screw extruder, and then sends the melt to the spinning box for spinning
2.1.13
polyamide filament
several or hundreds of continuous nylon filaments with a length of more than thousands of meters
2.1.14
polyamide staple fiber
fiber with certain length specification formed by cutting polyamide tow
2.1.15
polyamide filament for industry; polyamide industry yarn
continuous polyamide filament used in the industrial field, with a fiber linear density of 930 dtex to 2,100 dtex and a breaking strength of not less than 7.50 cN/dtex
2.1.16
polyamide tow
a long, essentially twistless bundle of continuous filaments assembled from tens of thousands of continuous filaments used for cutting into staple fiber, flocking, or tops
2.1.17
monofilament
continuous twistless filament spun from a single-hole spinneret by air-cooling process; or a plurality of continuous mother yarns spun from 3-hole to 24-hole spinneret by air-cooling process, which are divided into single twistless filaments by a yarn splitting machine; or twistless monofilament warp beams directly made from the mother yarns by a yarn splitting warping machine; or twistless yarn spun from 3-hole to 60-hole spinneret by water-cooling process and divided into single pieces by a yarn separator
2.1.18
bulked continuous filament
continuous filament with high crimp and fluffiness, which is made of polymer melt by spinning, drafting and deformation, also known as BCF or carpet yarn
2.1.19
after-treatment
technological process of stretching, deformation, interlacing, oiling, crimping, heat setting, cutting for the purpose of improving fiber textile processing performance
2.1.20
twisting and weaving
after-treatment process of polyamide filament for industry, including twisting and weaving
2.1.21
dipping
process of coating and infiltrating a layer of latex on the surface of nylon cord fabric or canvas, and treating it at high temperature to improve its adhesion with rubber
2.1.22
chips
cylindrical particles cut by an underwater pelletizer after the polymer melt is extruded from the ribbon casting hole, cooled and solidified into continuous strips in low-temperature water below 20°C; or spherical particles with a certain size formed by polymer melt extruded by a die immersed in high-temperature water at not less than 80°C, pelletized by a rotary knife, and then cooled and solidified
2.1.23
solid-state polycondensation
process in which the functional groups (terminal amino group and terminal carboxyl group) that can be activated at both ends of the molecule are initiated by temperature in high-temperature hot nitrogen or under vacuum, so as to continue the polycondensation reaction between the molecular chains and further improve the molecular weight of the polymer
2.1.24
liquid heating medium
liquid heat transfer oil which transfers the sensible heat of liquid heat transfer oil
2.1.25
gaseous heating medium
gaseous heat transfer oil which transfers the latent heat of gaseous heat transfer oil
2.1.26
primary heating medium
liquid-phase heat medium directly heated to more than 270°C by a heat medium furnace, which is often used as a heat source for heating secondary heating medium in modern polymerization devices
2.1.27
secondary heating medium
high-temperature liquid or vapor heat medium heated by a primary heating medium and recycled in a separate heat medium loop
2.1.28
dull
process of changing the reflection degree of light on the fiber surface by adding a certain amount of titanium dioxide (TiO2) to the polymer. It can be divided into semi dull and full dull according to the different amount of titanium dioxide
2.1.29
texturing
processing process that twistless filament is processed through false twist deformation by using the thermoplastic of fiber to produce curl elasticity and fluffy
2.1.30
underwater pelletizing
pelletizing process in which the polymer is extruded by a die immersed in high-temperature water at not less than 80°C, is scraped away at high speed by a rotary scraper close to the die, and is cooled and shrunk into spherical particles in hot water
2.1.31
chips extraction
process of reverse mass transfer and heat exchange between nylon 6 chips and hot water, and diffusion of unreacted monomers and some low molecular extractable substances from chips to water
2.1.32
caprolactam recovery
process of reclaiming and reusing caprolactam monomer and oligomer in extraction water of polyamide 6 chip and discharge water of polymerizer
2.1.33
monomer suction
technological process of extracting monomers and low boiling point substances emitted by the melt at the extrusion port of the ribbon casting plate or the outlet of the spinneret through a certain device during the casting or spinning of nylon 6
2.1.34
mechanical vapor re-compression system
technology that compresses the low-temperature and low-pressure secondary steam at the outlet of the evaporator through the compressor to increase the temperature and pressure, increase the enthalpy, and then enter the evaporator as a heat source, so as to realize the recycling of secondary steam, referred to as MVR
2.2 Symbols
ACY air covered yarn
AH salt hexamethylene diamine adipate; nylon 66 salt
ATY air texturing yarn
BCF bulked continuous filament
CPL caprolactam
DT draw twist
DTY draw textured yarn
dpf dtex per filament
FDY fully drawn yarn
HART highway addressable remote transducer
HOY high oriented yarn
HTM heat transfer media
MVR mechanical vapor re-compression technology
POY pre-oriented yarn, partially oriented yarn
PA polyamide
PA6 polyamide 6; nylon 6
PA56 polyamide 56; nylon 56
PA66 polyamide 66; nylon 66
SSP solid-state polycondensation
TEG triethylene glycol
TTY throwster textured yarn
UDY undraw yarn
3 Process design
3.1 General requirements
3.1.1 The process design scope of polyamide polymer and fiber plants shall meet the following requirements:
1 PA6 polymerization device shall meet the following requirements:
1) The process shall start with CPL discharge, including CPL preparation, polymerization, filtration, granulation, chip extraction, chip drying, chip conveying, chip mixed storage, chip packaging and CPL recovery, as well as heat medium station of auxiliary unit, auxiliary agent preparation, cleaning of melt filter element and ribbon casting plate or casting head, laboratory and tank farm, etc.;
2) Upon the polymerization device and the spinning device are built in the same plant area, and the chips are conveyed by air flow, the end of the battery limit of the polymerization device shall be at the outlet of the spinning device receiving the chip silo;
3) According to different process requirements, CPL recovery may include a combination of extraction water storage, multi-effect evaporation and MVR, oligomer treatment, CPL refining and CPL recovery storage.
2 PA66 polymerization device shall meet the following requirements:
1) The continuous polymerization process shall start with the discharge of AH salt solution, including storage, transportation, concentration, reaction, flash evaporation, pre-polymerization, post-polymerization, granulation, chip drying, chip conveying, chip mixed storage, chip packaging, as well as the heat medium station of auxiliary unit, auxiliary agent preparation, cleaning of melt filter element and ribbon casting plate or casting head, laboratory, etc.; if solid AH salt is adopted, salt dissolution and salt treatment shall also be considered;
2) The batch polymerization process shall start with the discharge of AH salt solution, including storage, transportation, concentration, polymerization, granulation, chip drying, chip conveying, chip mixed storage, chip packaging, as well as additive preparation, matting agent preparation, cleaning of melt filter element and ribbon casting plate or casting head, laboratory, etc.; if solid AH salt is adopted, salt dissolution and salt treatment shall also be considered;
3) When the melt direct spinning process is adopted, the end of the battery limit of the polymerization device shall be at the outlet of the spinning melt delivery pump.
3 The batch polymerization unit of polyamide 56 shall meet the following requirements:
1) The batch polymerization process shall start with the discharge of polyamide 56 solution, including storage, transportation, concentration, polymerization, granulation, chip drying, chip conveying, chip mixed storage, chip packaging, as well as additive preparation, matting agent preparation, cleaning of melt filter element and ribbon casting plate or casting head, laboratory, etc.;
2) Upon the polymerization device and the spinning device are built in the same plant area, and the chips are conveyed by air flow, the end of the battery limit of the polymerization device shall be at the outlet of the spinning device receiving the chip silo.
4 The spinning device shall meet the following requirements:
1) The polyamide domestic filament plant which adopts polyamide chips spinning process shall start with the discharge of polyamide chips, through feeding, melting, spinning, cooling, oiling, drafting, interlacing, winding, balancing, to POY, FDY, HOY intermediate warehouse or graded packaging; for non vacuum packaged dry chips, drying before melting shall also be included;
2) The polyamide staple fiber plant which adopts the polyamide chips spinning process shall start with the discharge of polyamide chips, through feeding, melting, spinning, cooling, oiling, yarn guiding, spooling, to the balance room; for non vacuum packaged dry chips, drying before melting shall also be included;
3) The polyamide industry yarn plant which adopts polyamide chips spinning process shall start with the discharge of polyamide chips, through feeding, melting, spinning, cooling, oiling, multi-stage drafting, winding and industry yarn packaging; for non-vacuum packaged dry chips, drying or solid-state polycondensation before melting shall also be included;
4) Polyamide BCF plant which adopts chip spinning process shall start with unloading polyamide chips, through feeding, melting, spinning, cooling, oiling, drafting, deformation and winding, to BCF packaging; for non vacuum packaged dry chips, drying before melting shall also be included;
5) The polyamide 66 plant which adopts melt direct spinning process shall start from the outlet of spinning melt pump, and each process after spinning is the same as that of chip spinning filament, industry yarn, staple fiber and BCF;
6) Auxiliary units should include spinning finish oil preparation, spinning assembly cleaning, additive system, gas phase heat medium system, laboratory, material inspection room, drafting and winding preservation room, etc.
5 The after-treatment device shall meet the following requirements:
1) Except FDY, HOY and other one-step domestic filaments, the after-treatment of other domestic filaments shall start with balance, or pre interlacing, drafting, interlacing, winding, to DT after oiling, or ATY after air deformation, or ACY after air coating, or TTY after double twisting, and graded packaging;
2) For industry yarn plants with cord fabric or canvas production, the after-treatment shall start from balance to twisting, weaving, dipping and other production and packaging;
3) The after-treatment of staple fiber shall start from bundling, oiling, multi-graded drafting, heat setting, crimping, relaxation heat setting, cutting, to staple fiber packing; polyamide tow for flocking production shall be packed and packaged after multi-graded drafting; polyamide tow for top production shall be packed and packaged after relaxation and heat setting;
4) BCF after-treatment shall start from balance to the production and packaging of double-strand BCF twisted and heat-set products or three-strand BCF air interlace products;
5) Auxiliary units may include after-treatment finish oil preparation, material inspection room, HTM workstation (room), cord fabric stock preparation room, etc.
3.1.2 The design capacity of polyamide polymer and fiber plants shall meet the following requirements:
1 For the polymerization device, the daily output of dry chips under 100% load or the output of polymer melt directly spun by melt shall be taken as the calculation basis, and shall be expressed in "t/d";
2 For the spinning device, the average size of each typical fiber product in the product scheme shall be taken as the calculation basis, and shall be expressed in "t/a";
3 For polyamide industry yarn plants with cord fabric or canvas as products, the weight per unit area of each typical product of cord fabric or canvas in the product scheme shall be taken as the calculation basis, and shall be expressed in "t/a".
3.1.3 The design annual production days of polyamide polymerization and filament plant should be calculated as 350d (8,400h), and the design annual production days of polyamide staple fiber plants should be calculated as 333d (8,000h).
3.1.4 Polyamide 6 chip spinning process should be adopted in polyamide 6 spinning plant. The spinning plants of nylon 66 and nylon 56 may choose polyamide 66 melt or polyamide 56 melt direct spinning process or chip spinning process according to the product and output.
3.1.5 Storage of liquid CPL, melting and polymerization of solid CPL shall be protected by nitrogen with purity not less than 99.999% and oxygen content not exceeding 5ppm.
3.1.6 The salt tank, pre-polymerization and post-polymerization of AH salt and polyamide 56 salt shall be protected by nitrogen with purity not less than 99.999% and oxygen content should not exceeding 5ppm.
3.1.7 The temperature of hot water system for liquid CPL storage and conveying pipeline should not be higher than 95°C, and expansion tank shall be set at the highest point of closed circulating hot water system.
3.1.8 Polyamide 6, polyamide 66 and polyamide 56 chips shall be protected from oxidation during drying and conveying, and reliable electrostatic grounding facilities shall be set.
3.1.9 Low boiling point heat medium should be used as gaseous heating medium, and hydrogenated terphenyl or diarylalkane should be used as liquid heating medium.
3.1.10 The heat source of polymerization reaction and the heat medium evaporator of large spinning equipment should adopt the mode of heating secondary heating medium with primary heating medium.
3.1.11 The design of primary heating medium system and secondary heating medium system shall comply with the relevant requirements of the current industry standard TSG G0001 Boiler safety technical supervision administration regulation.
3.1.12 For liquid circulation system in secondary heating medium, if the same heating medium as the primary heating medium system is used, the venting, draining, replenishment, expansion absorption and collection facilities should be set as a whole; if the heating medium is different from the primary heating medium, independent venting, emptying, replenishment, expansion absorption and collection facilities shall be designed.
3.1.13 The gaseous system in secondary heating medium shall be designed with independent venting, draining, replenishment and collection facilities. The heat medium evaporator shall be equipped with overtemperature and overpressure alarm, cut-off heat source interlock, overpressure relief and heat medium receiving tank, wherein, coolers and flame arresters shall be set on the exhaust piping of the heat medium receiving tank.
3.1.14 The HTM system shall be provided with storage tanks that can fully receive the HTM discharged from production equipment and pipelines in case of emergency.
3.1.15 Safety relief devices shall be provided for the following equipment:
1 Polyamide 66 salt preheater, reactor, evaporator, organic heat carrier boiler;
2 Pre-polymerization reactor, post-polymerization reactor, heat medium evaporator, recovery cracking reactor, organic heat carrier boiler and HTM expansion tank of polyamide 6 polymerization device;
3 Polyamide 56 concentration tank, reactor, evaporator;
4 Nitrogen and instrument gas storage tanks;
5 Other equipment whose top operating pressure may exceed 0.07 MPa under abnormal conditions.
3.1.16 Sampling ports shall be set on polymerization device according to production inspection requirements.
3.1.17 The storage area, transit area, balance area and fiber production area of polyamide chips and fibers shall be away from sunlight.
3.1.18 Liquid CPL, AH salt solution and polyamide 56 salt solution shall be stored and transported above their freezing point or crystallization point.
3.1.19 Solid CPL, AH salt and polyamide 56 salt shall be stored by waterproof, moisture-proof and light-proof measures.
3.1.20 Auxiliary process facilities should be arranged in the side room of the workshop with external walls, and shall be close to the main process device served.
3.1.21 The polymerization plant shall be equipped with a laboratory; the spinning plant shall be equipped with a laboratory and a material inspection room; when the polymerization device and the spinning device are in the same plant area, one laboratory may be provided.
3.1.22 The corresponding rooms on the upper and lower floors of material inspection room, laboratory, instrument control room and substation and distribution room and adjacent rooms shall not be provided with side rooms or equipment with damp, ponding, large dust, and vibration.
Foreword i
1 General provisions
2 Terms and symbols
2.1 Terms
2.2 Symbols
3 Process design
3.1 General requirements
3.2 Design principle
3.3 Process flow selection
3.4 Process calculation
3.5 Combustible and explosive hazardous area
3.6 Energy saving and conservation
3.7 Other requirements
4 Polymerization equipment and layout
4.1 General requirements
4.2 Principles of selecting equipment
4.3 Equipment configuration
4.4 Principles of equipment layout
5 Spinning and after-treatment equipment and layout
5.1 General requirements
5.2 Principles of selecting equipment
5.3 Equipment configuration
5.4 Principles of equipment layout
6 Process pipeline design
6.1 General requirements
6.2 Pipeline layout
6.3 Selection of pipeline material
6.4 Design of special pipeline
6.5 Pipeline installation and inspection requirements
7 Auxiliary production facilitates
7.1 Chemical laboratory
7.2 Physical laboratory
7.3 Spinning finish preparation room
7.4 Spinning pack cleaning room
7.5 HTM workstation
7.6 Storehouse
7.7 Maintenance room
8 Automatic control and instrument
8.1 General requirements
8.2 Control level
8.3 Main control scheme
8.4 Special instrument selection
8.5 Control system configuration
8.6 Control room
8.7 Safety interlock
8.8 Instrument safety policy
9 Electrical and telecommunications
9.1 General requirements
9.2 Power supply and distribution
9.3 Lighting
9.4 Lightning protection
9.5 Grounding
9.6 Automatic fire alarm
9.7 Telecommunications
10 General layout and transportation
10.1 General requirements
10.2 General layout
10.3 Vertical layout
11 Architecture and structure
11.1 General requirements
11.2 Production building
11.3 Side rooms of production building
11.4 Auxiliary production project
11.5 Fireproof, anti-explosion, anti-corrosion of building
12 Water supply and drainage
12.1 General requirements
12.2 Water supply
12.3 Drainage
12.4 Fire-protection facilities
13 Heating, ventilation and air-conditioning
13.1 General requirements
13.2 Heating
13.3 Ventilation
13.4 Air conditioning
13.5 Equipment, air duct and others
14 Environment protection
14.1 General requirements
14.2 Wastewater treatment
14.3 Waste gas treatment
14.4 Waste solid treatment
14.5 Noise control
15 Occupational safety and health
15.1 General requirements
15.2 Occupational hazardous factors
15.3 Protective measures for safety
15.4 Occupational health measures
Annex A Data of combustible and toxic material in polyamide polymer and fiber plants
Explanation of wording in this standard
List of quoted standards
