Detail of DL/T 1175-2021

Introduction of DL/T 1175-2021

DL/T 1175-2021 Technical requirements for filter fabric and bag of flue gas bag house for thermal power plants 1 Scope This document specifies the general requirements, basic parameters, selected technical requirements, use management and life evaluation, inspection methods, sampling inspection of filter fabric and bag of flue gas bag house for thermal power plants. This document is applicable to flue gas bag house for thermal power plants and electrostatic-fabric integrated precipitator. 2 Normative references The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 3820 Determination of thickness of textiles and textile products GB/T 3916 Textiles - Yarns from packages - Determination of single-end breaking force and elongation at break using constant rate of extension (CRE) tester GB/T 3923.1 Textiles - Tensile properties of fabrics - Part 1: Determination of maximum force and elongation at maximum force using the strip method GB/T 4668 Textiles - Woven fabrics - Determination of number of threads per unit length GB/T 4669 Textiles - Woven fabrics - Determination of mass per unit length and mass per unit area GB/T 4743 Textiles - Yarn from packages - Determination of linear density(mass per unit length)by the skein method GB/T 5453 Textiles - Determination of the permeability of fabrics to air GB/T 6505 Man-made fiber - Test method for thermal shrinkage of filament yarns (after treatment) GB/T 6719 Specifications for bag house GB/T 9914.3 The method for reinforcement products - Part 3: Determination of mass per unit area GB/T 14335 Testing method for linear density of man-made staple fibres GB/T 14337 Man-made fibre - Test method for tensile properties of staple fibre GB/T 16845-2017 Dust collector - Terminology GB/T 24218.1 Textiles - Test methods for nonwovens - Part 1: Determination of mass per unit area GB/T 24218.2 Textiles - Test methods for nonwovens - Part 2: Determination of thickness GB/T 24218.3 Textiles - Test methods for nonwovens - Part 3: Determination of tensile strength and elongation (strip method) DL/T 387 Guideline of flue gas bag filter selection for thermal power plants DL/T 1121 Technical specifications of bag filter system for coal-fired power plants DL/T 1493 Ultra-clean electrostatic-fabric integrated precipitator for coal-fired power plants DL/T 1619 Technical requirement of filter bag of the bag house for thermal power plants HJ/T 324 Specifications for environmental protection product Fabric for bag house HJ/T 326 Specifications for environmental protection product - Membrane complex fabric for bag house HJ/T 327 Specifications for environmental protection product - Bag house bag HJ 2039 Technical specifications for dedusting engineering of thermal power plants JB/T 12119 Packing ring elastic test method for the bag of fabric filter 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 16845-2017 and the following apply. 3.1 breaking strength maximum force recorded when specimens are stretched in the tensile test under specified conditions, expressed in Newton (N) Note: Generally, the specimens are of 200 mm × 50 mm and tested along the warp direction and weft direction of filter media. 3.2 breaking elongation ratio of the increased length of the filter media when it is stretched to fracture to its initial length under standard pretension, expressed in percentage (%) 3.3 constant load elongation at 50N ratio of the increased length to the initial length of the filter media with the size of 200 mm × 50 mm when the tension reaches 50N, expressed in percentage (%)

Contents of DL/T 1175-2021

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 General requirements 5 Basic parameter 6 Technical requirements for selection of filter bags 7 Use management and life evaluation of filter bag 8 Test methods 9 Sampling inspection Annex A (Information) Technical index of component materials for making filter media and filter bags Annex B (Information) Main technical parameters used in selection of filter bag Annex C (Informative) Recommended filter media and applicable conditions Annex D (Informative) Evaluation method of filter bag remaining useful life