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 developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces JB/T 10731-2007 Limestone wet ball mill for desulphurization, with respect to which, the following main technical changes have been made:
——specifications and models are added;
——the materials and mechanical properties of main parts and components are adjusted;
——the magnetic particle testing requirements for key positions of main parts are added;
——safety requirements are added;
——the inspection rules are standardized and improved.
This standard was proposed by China Machinery Industry Federation.
This standard is under the jurisdiction of the National Technical Committee on Mining Machinery of Standardization Administration of China (SAC/TC 88).
The previous edition of this standard is as follows:
——JB/T 10731-2007.
Limestone wet ball mill for desulphurization
1 Scope
This standard specifies the types and basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of limestone wet ball mill for desulphurization.
This standard is applicable to wet ball mill (hereinafter referred to as mill) used in flue gas desulphurization pulping system for grinding limestones of different hardness.
2 Normative references
The following referenced documents are indispensable for the application 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 1174-1992 Cast bearing metals
GB/T 1348-2009 Spheroidal graphite iron castings
GB/T 3768 Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Survey method using an enveloping measurement surface over a reflecting plane
GB 5226.1 Electrical safety of machinery - Electrical equipment of machines - Part 1: General requirements
GB/T 7233.1-2009 Steel castings - Ultrasonic examination - Part 1: Steel castings for general purposes
GB/T 9439-2010 Grey iron castings
GB/T 9444-2007 Magnetic particle testing for steel castings
GB/T 10095.1-2008 Cylindrical gears - System of accuracy - Part 1: Definitions and allowable values of deviations relevant to corresponding flanks of gear teeth
GB/T 10095.2-2008 Cylindrical gears - System of accuracy - Part 2: Definitions and allowable values of deviations relevant to radial composite deviations and runout information
GB/T 13306 Plates
GB/T 25706 Code of designations for mining machinery products
HG/T 20678 Specification on design of steel shell with liner
HGJ 229 Code for construction and acceptance of anticorrosive engineering or industrial equipment and pipeline
JB/T 5000.3-2007 Heavy mechanical general techniques and standards - Part 3: And standards welding
JB/T 5000.6-2007 Heavy mechanical general techniques and standards - Part 6: Steel castings
JB/T 5000.8 Heavy mechanical general techniques and standards - Part 8: Forging
JB/T 5000.9 Heavy mechanical general techniques and standards - Part 9: Cutting
JB/T 5000.12 Heavy mechanical general techniques and standards - Part 12: Paint
JB/T 5000.13 Heavy mechanical general techniques and standards - Part 13: Packing
JB/T 6396-2006 Specification for the heavy alloy structural steel forgings
JB/T 8853 Reduction cylindrical gear units
3 Type and basic parameters
3.1 Type
The types of mill are shown in Figures 1 and 2, in which the specific structure is not specified.
Figure 1 Wet overflow limestone ball mill for desulfurization
Figure 2 Wet grate limestone ball mill for desulfurization
3.2 Model
The model designation of mill shall meet the requirements of GB/T 25706, as follows:
Example 1:
The wet overflow limestone ball mill for desulphurization with a cylinder diameter of 2,700mm and a cylinder length of 6,000mm is designated as:
MST-2760 limestone wet ball mill for desulphurization
Example 2:
The wet grate limestone ball mill for desulphurization with a cylinder diameter of 2,700mm and a cylinder length of 5,500mm is designated as:
MSGT-2755 limestone wet ball mill for desulphurization
3.3 Basic parameters
The basic parameters of mill shall meet those specified in Tables 1 and 2.
Table 1 Basic parameters of wet overflow limestone ball mill for desulphurization
Note 1: The reference weight of machine does not include the weight of main motor and reducer.
Note 2: The production capacity in the table refers to the estimated value assuming that the grindability index of limestone is WiB=9~11, the feeding granularity is ≤20mm, the ore discharge granularity is ≤44μm, and the pass rate is 90%.
Table 2 Basic parameters of wet grate limestone ball mill for desulphurization
Note 1: The reference weight of machine does not include the weight of main motor and reducer.
Note 2: The production capacity in the table refers to the estimated value assuming that the grindability index of limestone is WiB=9~11, the feeding granularity is ≤20mm, the ore discharge granularity is ≤44μm, and the pass rate is 90%.
4 Technical requirements
4.1 Basic requirements
4.1.1 The mill shall meet the requirements of this standard and manufactured according to the drawings and technical documents approved by established procedure.
4.1.2 The technical requirements of raw materials, purchased parts and processing, assembly and installation not specified in this standard shall meet the requirements of national standards and relevant general professional standards.
4.1.3 Service conditions: ambient temperature: -5℃~40℃;working system: continuous.
4.1.4 The cutting parts, weldments, castings, forgings and painting of the mill shall comply with the requirements of JB/T 5000.9, JB/T 5000.3, JB/T 5000.6, JB/T 5000.8 and JB/T 5000.12 respectively.
4.1.5 The anti-corrosive treatment shall meet the requirements of HG/T 20678 and HGJ 229.
4.2 Complete machine performance requirements
4.2.1 The main technical parameters of the mill shall comply with the requirements of this standard and be applicable to the system process requirements.
4.2.2 The oil return temperature rise of the main bearing shall not exceed 15℃, and the maximum oil return temperature shall not exceed 55℃.
4.2.3 Dynamic and static pressure main bearings are recommended for mills with cylinder diameter greater than or equal to Φ2,400mm; rolling bearings may be adopted for mills with cylinder diameter less than Φ2,400mm.
4.2.4 The lubricating device of the mill shall operate reliably. If it is equipped with a lubricating station, the oil pump motor and the main motor shall be provided with electrical interlocking device which shall send a signal in case of fault in the lubricating system, so as to ensure that the main motor stops automatically; and alarm signal devices for oil temperature, oil pressure, oil volume and differential pressure shall be equipped. The lubricating system shall be equipped with safety devices such as safety valve, pressure gauge and thermometer. The inclination of the oil return pipeline shall not be less than 1:40.
Foreword i 1 Scope 2 Normative references 3 Type and basic parameters 3.1 Type 3.2 Model 3.3 Basic parameters 4 Technical requirements 4.1 Basic requirements 4.2 Complete machine performance requirements 4.3 Safety requirements 4.4 Requirements for main parts and components 4.5 Technical requirements for assembly 4.6 Electric control 4.7 Requirements for trial run 4.8 Painting 5 Test methods 6 Inspection rules 6.1 Inspection classification 6.2 End-of-manufacturing inspection 6.3 Type inspection 7 Marking, packaging, transportation and storage Figure 1 Wet overflow limestone ball mill for desulfurization Figure 2 Wet grate limestone ball mill for desulfurization Table 1 Basic parameters of wet overflow limestone ball mill for desulphurization Table 2 Basic parameters of wet grate limestone ball mill for desulphurization Table 3 Radial runout and axial swing tolerance of end cover Table 4 End surface swing tolerance Table 5 Backlash in circular tooth of main and pinion gears
