Standard name Dust prevention technical specification for talc powder processing
Standard Type National Standard of the People's Republic of China
Standard name (English) Code of dust coatrol for talc powder processing
Standard number GB13910-92
Figure 1; Figure 2; Figure 3; Figure 4;
Standard text
1 Subject content and scope of application
This standard specifies the basic requirements for dust prevention and comprehensive dust prevention measures for talc powder processing plants (shops).
This standard applies to the dust-proof design and management of talc powder processing plants (shops).
2 Reference standard
TJ36 industrial enterprise design hygiene standard
GBJ4 industrial "three wastes" emission test standard
GBJ19 Heating Ventilation and Air Conditioning Design Code
3 process design dust is coming
3.1 Select advanced production processes to minimize the processing, mechanization and automation of the process.
3.2 Arrange the process equipment, and provide the necessary conditions for the reasonable configuration of the dust-proof facilities.
3.3 Arrange the process equipment and dust-proof facilities, which should be convenient for dry work, maintenance and daily cleaning.
3.4 It is advisable to adopt sealing and pipe-twisting measures for conveying powdery materials; when adopting conventional conveying equipment, sealing measures should be taken to minimize intermediate links, reduce material drop and shorten conveying distance.
3.5 The layout of the workshop process should arrange the section with serious dust pollution on the downwind side of the dominant wind direction in summer and isolate it from other sections as much as possible.
4 plant design dustproof to come
4.1 Site selection
4.1.1 The site selection should be away from residential areas and other buildings, and located on the upwind side of the summer minimum frequency wind direction in residential areas and living service areas.
4.1.2 The talcum powder processing workshop should be located on the downwind side of the main wind direction of other buildings in the plant area.
4.1.3 In the mountainous area, the orientation of the plant should be considered to affect the local wind caused by the topography and temperature difference.
4.2 Factory building
4.2.1 Building complexes should be avoided to form a closed form so as not to impede the natural ventilation of the workshop.
4.2.2 The plant area and plant height of the processing workshop should meet the requirements of process layout and ventilation and dust removal.
4.2.3 The Raymond mill workshop should adopt a multi-storey structure workshop.
4.2.4 Between the multi-storey building compartments, isolation measures should be taken between the dust-producing process and other processes to prevent the diffusion and cross-flow of dust-laden air.
4.2.5 The structure, doors, windows, walls and floors of the plant should not be easily dusty and easy to clean.
4.2.6 The warehouse should be easy to ventilate and the ground should be protected against moisture.
5 dust source sealed
5.1 Sealing measures should be taken as far as practicable for dust-generating equipment and dusting points.
5·2 According to the characteristics of dust emitted by the equipment, the structure and operation of the equipment, respectively, adopt different sealing methods such as partial sealing, integral sealing and closed chamber.
5.3 The sealing device should be convenient for production operation and equipment maintenance, and its structure should be firm and reliable.
5.4 The connection between the equipment and the pipeline and between the pipeline and the pipeline should be strictly sealed. When connecting dynamically, it should be soft.
Sexual material.
6 Ventilation and dust removal measures.
6.1 Raw material drying equipment
6.1.1 Dust removal measures shall be taken for the dusty gas discharged from the raw material drying equipment.
6·1·2 The dust-containing gas discharged from the drying equipment has a high temperature and a high humidity. It is recommended to use wet dust removal. If dry dust removal is adopted, measures to prevent condensation and clogging must be taken.
6.1.3 The discharge opening of the drying equipment shall be provided with a closed cover and exhausted.
6.2 Crushing equipment
6·2·1 The crusher of the front crusher shall adopt a partial airtight cover or a cabinet exhaust hood according to the feeding mode, and the discharge opening shall be provided with a partial closed cover and exhaust air together with the conveying equipment.
6·2·2 Reversible hammer crusher should pay attention to keep the casing tight. Generally, the inlet should be tightly sealed and exhausted, and the discharge port should also be sealed or exhausted.
The inlet of the irreversible hammer crusher shall be tightly closed and a lock valve shall be provided. The discharge port shall be provided with a closed cover and exhausted, and a pressure equalizing pipe shall be arranged between the inlet port and the discharge port closed cover.
6.3 Conveying equipment
6.3.1 For the dusting points scattered during the material conveying process, the dust removal unit may be used for dust removal on site.
6.3.2 Tape conveyors are generally provided with a partial airtight cover at the unloading point and the transfer point for exhaust. If the drop is large, a flow isolation device should be provided in the chute.
6.3.3 The bucket elevator should be tightly sealed, generally only in the lower part of the air. In order to reduce the dust concentration of the exhaust air, the air outlet should not be close to the feed port, and should not be placed on the load side as much as possible. When the height of the hoist is greater than 10m or the temperature of the material is high, the upper part should also be vented.
6.3.4 When the screw conveyor is well sealed, the exhaust hood may not be provided. When the material drop is large, the venting hood shall be provided at the receiving point, and the buffer box shall be provided at the lower part.
6.3.5 The pneumatic conveying device shall be reinforced and sealed, and the exhaust gas purification shall adopt a high-efficiency dry dust collector.
6.4 Grinding equipment
6.4.1 The Raymond mill wind system should use a positive pressure operating system.
6.4.2 The entire wind circuit must be sealed with Raymond.
6.4.3 Raymond mill dust removal should generally be provided with an independent dust removal system, and the purification equipment should use a high efficiency dust collector. Effective measures to prevent condensation and clogging should be taken for dust removal ducts and dry dust collectors.
6.4.4 For the large cyclone and the existing small cyclone that is used as the residual wind, the lower part of the cyclone must be installed with a closed discharger or a closed silo.
6.4.5 Ultra-fine grinding powder conveying system must have a good seal. The collection of powder and the purification of exhaust gas should adopt bag filter.
6.5 Packaging equipment
6.5.1 A vacuum hood should generally be provided on both sides, at the bottom of the packaging machine or around the mouth of the package. A hopper should be provided under the packaging platform and the air should be exhausted.
6.5.2 Bag dust collectors can generally be used for dust removal in packaging machines.
6.5.3 Large bag packaging machines should be equipped with a closed chamber with exhaust air.
6.6 Powder storage
6.6.1 The powder should be stored in a dedicated walled warehouse or closed silo.
6.6.2 Silo (bucket) Generally, a simple pressure-relief filter bag or a bag-type dust collector can be installed at the top according to the receiving mode.
7 Ventilation and dust removal system settings
7.1 System Settings
7.1.1 According to the process flow, equipment configuration, plant conditions and the amount of exhaust air, the local dust removal system, decentralized dust removal system or centralized dust removal system can be designed separately.
7.1.2 The grinding equipment and drying equipment should be equipped with a separate dust removal system.
7.1.3 Try to use a single-stage dust removal system. When the gas dust concentration is high, exceeding the allowable range of the selected dust collector or failing to meet the discharge standard, a two-stage dust removal system should be used.
7.1.4 When designing the dust removal system, the system air volume, wind speed and other technical parameters should be reasonably determined.
7.1.5 When the temperature of the dust-containing gas is high and the humidity is high, the heat-removing or heating measures shall be taken for the dust-removing system.
7.2 Vacuum hood
7.2.1 The dusting point of the dust-producing equipment should be selected according to the characteristics of the dust source and the operating conditions.
7.2.2 Seal the dust source as much as possible; when it cannot be sealed, the cover should be as close as possible to the dust source.
7.2.3 In order to effectively control dust escaping and avoid excessive suction of powder, determine the appropriate amount of air (see Appendix A) and make the airflow in the hood uniform.
7.2.4 The dust hood should be easy to operate, easy to access, safe to use, and durable.
7.3 Dust collector
7.3.1 The precipitator should be selected according to national emission standards, the nature of the dust-containing gas and the performance of the dedusting equipment (see Appendix B).
7.3.2 Use a dry dust collector as much as possible, and use a wet dust collector when conditions permit.
7.3.3 All the dust discharge ports of the dust collectors shall be equipped with a lock air discharge device. The dry ash or sewage and sludge shall be removed from the dust collector in time to prevent secondary pollution.
7.3.4 The dust collector shall be installed and used according to its performance and specified technical requirements. The working state of the dust collector shall be regularly checked to ensure that the dust removal efficiency meets the design requirements.
7.4 Dust removal duct
7.4.1 The dust-removing air duct should be short and straight, and should be set vertically. When the inclined laying is applied, the duct inclination should be no less than 50°, otherwise the running wind speed should be reasonably increased. At the same time, a cleaning hole is arranged near the side of the air duct or the shaped tube.
7.4.2 The dust removal duct shall have a reasonable wind speed to prevent talc dust from depositing. The diameter of the duct should be no less than 80mm.
7.4.3 A detection hole shall be provided at the appropriate part of the dust removal duct.
7.4.4 The exhaust duct of the dust removal system shall be 1.5m above the roof. If the exhaust wind affects adjacent buildings, it shall be increased according to the specific conditions.
7.5 ventilator
7.5.1 Select the fan according to the air volume, wind pressure and working conditions of the fan required by the dust removal system.
7.5.2 The dust removal system shall be a centrifugal fan, which is usually placed behind the dust collector. In the case of two-stage dust removal, the ventilator can generally be placed after the first stage dust collector.
7.5.3 Fans should generally take measures to reduce vibration and reduce noise. The fan inlet and outlet should be connected flexibly.
7.5.4 The ventilator should always be in good working condition, keep it running smoothly, the impeller and the casing are intact, and there is no dust in the machine.
8 dust management
8.1 Newly built, expanded and rebuilt talcum powder processing enterprises must design, construct and simultaneously put dust-proof facilities and main works at the same time.
8.2 The enterprise shall formulate technical measures for dust control and improve dust prevention measures so that the dust concentration and exhaust gas concentration in the air of the workplace reach the national standard.
8.3 The enterprise shall establish and improve the dust control organization and be equipped with full-time dust control personnel, specifically responsible for the management of dust prevention work and the implementation of dust prevention technical measures.
8.4 The enterprise shall formulate necessary dust control rules and regulations and implement them in earnest.
8.5 Ventilation and dust removal system shall be managed by special personnel, develop post responsibility system and operation procedures, and establish technical files of ventilation and dust removal system.
8.6 The company shall establish a workshop cleaning responsibility system. To reduce dust, use a high vacuum cleaner as much as possible.
8.7 All kinds of dust-collecting personnel should be trained in dust-proof education and dust-proof technology, and conduct necessary assessments.
8.8 Regularly check the dust concentration in the air of the workshop and archive the results.
8.9 Workers must wear dust-proof overalls and dust masks when working on dust.
8.10 Enterprises should set up locker rooms, locker boxes, and staff bathrooms to facilitate the replacement of labor protection products and showers after work.
8.11 The enterprise shall conduct regular physical examinations of the dust-collecting personnel and establish employee health records.
Additional information:
This standard was proposed by the Ministry of Labor of the People's Republic
This standard was drafted by the Anhui Provincial Labor Protection Science Research Institute.
The main drafters of this standard are Xu Zhendong, Wang Xiangyu and Chen Dahou.
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