GB 21501-2008Cupola and cupola charging machine - Safety requirements (English PDF)

4.1 Mechanical hazards

4.1.1 move the cupola, feeder mechanical strength, mainly the stability may have broken, cracked, overturning and unpredictable Danger.

4.1.2 by the feeder parts and materials falling or thrown shock hazard generated.

4.1.3 generated by the feeder crushing, shearing, winding and dangerous.

4.1.4 by a cupola, surface feeder, the edges or corners produced stabbed or cut hazards.

4.1.5 or fall from the high-altitude operations generated around the device, slipping, tripping hazard.

4.2 Electrical Hazards

4.2.1 generated by the electrical systems of electric shock.

4.2.2 generated by lightning effect lightning hazard.

4.3 Thermal hazard Burns from the hot object, flames and heat radiation generated by the risk of scalding.

4.4 noise hazard Danger from the cupola blower, feeder noise hearing losses.

4.5 hazardous materials and substances produced

4.5.1 in the cupola melting and feeding area inhalation of carbon monoxide gas and dust caused danger.

4.5.2 liquid metal from the cupola, the hot coke, fire and explosion hazards of carbon monoxide produced.

4.6 cupola danger, feeder design principles ignore human learning ergonomics generated

4.6.1 In the cupola, feeder operation is not conducive to healthy posture or excessive force when monitoring or maintenance.

4.6.2 ignores the use of personal protective equipment at the time of melting.

4.6.3 not set clear warning in hazardous locations.

5.1 Basic requirements

5.1.1 cupola furnace, feeding machine should be maximized through design reduces the risk of making it intrinsically safe. Can not be effectively prevented by designing Risk or fully restricted, security guards should be used to protect people.

5.1.2 Cupola furnace safety design, feeder should be consistent with GB/T 15706.1, GB/T 15706.2 and GB 5083 regulations.

5.1.3 Control system components related to the safety and security requirements should be designed to comply with the relevant provisions of GB/T 16855.1 of.

5.1.4 cupola furnace, feeding machine should be designed to fully reflect ergonomic principles, and should be consistent with GB/T 16251, GB/T 14776 of Provisions.

5.1.5 Who can not be eliminated by design or sufficiently reduce the residual risks, should inform the user through the use of information. Safety requirements for mechanical hazards 5.2

5.2.1 Cupola welding quality should meet the requirements of grade III GB/T 3323-2005 stipulated.

5.2.2 Water-cooled cupola furnace body should be used in the manufacture of steel boilers, the rest should be used in the mechanical properties not less than Q235A steel manufacturing. Key ministries Bit minimum thickness of the steel plate should not be less than specified in Table 1 to Table 3. Melting rate is greater than 5t/h cupola furnace floor should frame. Table 1 minimum thickness often lining cupola key parts of the steel sheet Melting rate/(t/h) Minimum thickness/mm Wind furnace shell flange rib bottom plate 7101612630 10101612630 15101612640 20121814640 25121814640 30121814840 The minimum thickness of the thin lining Table 2 water-cooled cupola key parts of the steel sheet Melting rate/(t/h) Minimum thickness/mm Wind furnace shell flange rib bottom plate 3101612530 5101612530 7121812630 10142212630 Table 3 minimum thickness of the water-cooled cupola furnace lining without key parts of the steel sheet Melting rate/(t/h) Minimum thickness/mm Wind furnace shell flange rib bottom plate 7162412630 10182812630 15182814640 20182814640 25203016640 30203016840

5.2.3 Cupola furnace shell of the coupling flange bolt size and number of not less than specified in Table 4, the performance of not less than GB/T 3098.1-2000 requirements specified in 4.8. Table 4 bolt size and number Melting rate/(t/h) the number of bolts Bolt size/month 1 M16 12 2 M16 12 3 M16 12 5 M20 12 7 M20 16 10 M20 16 15 M20 16 20 M24 18 25 M24 18 30 M24 18

5.2.4 cupola furnaces and furnace bottom leg, the furnace floor and furnace and the furnace sections, coupled with leg furnace installation foundation should be strong. Cupola on It should be left end position coupled with the auxiliary fixed.

5.2.5 After installation center cupola furnace deviation should not exceed 0.2% of body height.

5.2.6 Mobile cupola furnace structure should prevent wheel derailment and wheel spacing device.

5.2.7 On the outer cylinder should be equipped with air bladder thermal expansion compensation mechanism, heat exchange to be used should be able to ensure that the upper and lower end of the furnace heat balance.

5.2.8 bottom of the door opening and closing function of the locking mechanism should be reliable, the safety factor of not less than 5.

5.2.9 design process to deal with feeder overturning stability be checked. Safety factor

5.4 Thermal hazard safety requirements

5.4.1 Cupola furnace between the flanges and air leakage at application fire-resistant, heat-insulating material sealed.

5.4.2 Cupola furnace floor should be crack. Bottom gate latch should be firm, there should be due to mechanical failure and accidental opening.

5.4.3 is the risk of plugging the taphole when reduced to a minimum, Cupola be provided with reliable taphole blocking mechanism.

5.4.4 Cupola hot air pipe outer surface application fire-resistant, heat-insulating material coated.

5.4.5 cupola shall be constructed to ensure that the bridge and the former furnace interface butt good.

5.4.6 feeding platform shall be constructed to ensure that the operator can feed port away from the cupola.

5.4.7 Water-cooled furnace furnace shell should be tight, cooling water should leak into the furnace.

5.4.8 sealed cooling water jacket and the cooling air pressure test should be carried out, the test pressure of the cooling water jacket is 0.4MPa, dwell time To 5min, test pressure cooling air is 1.2MPa, holding time of 10min, there should be no leakage.

5.4.9 safety instructions in the instructions for use should be following, and set the following warning signs cupola relevant parts.

--- Careful in feeding the mouth or eyes ventilation when plugging the taphole, easy to flames or red-hot molten metal;

--- When the furnace repair, furnace wall should be, and the bottom bridge hermitages tight, tight, and the angle of the bottom of the bridge design requirements shall be flat slope cultivation, smooth;

--- Careful, direct physical contact surfaces of the furnace may be burned;

--- Be careful when opening the door bottom, there will be red-hot coke and iron unmelted material fall. Safety requirements

5.5 Noise dangerous

5.5.1 Cupola is equipped with a fan should be placed in soundproof room, with soundproofed rooms noise source, the equivalent continuous sound pressure level limit of 85dB (A). Feeder during operation should not have abnormal sound, under idling conditions, the equivalent continuous sound pressure level limit of 85dB (A), measured Setting Method according to JB/T 6331.2 requirements.

5.5.2 arranged in parallel lines should not contact each other, to prevent the generation of noise.

5.6 Materials and substances dangerous security requirements

5.6.1 cupola in use should be equipped with dust removal device. Smelting process control dust emission concentration should be consistent with national and local environmental protection department The relevant provisions. Determination of dust emission concentration is carried out by the local environmental protection department according to relevant regulations.

5.6.2 resistance furnace gas dust removal means is formed should be reasonable regulation, in order to avoid the charging port at the furnace gas to escape. Each member shall occur leakage Dust phenomenon.

5.6.3 meet the operational requirements of the conditions, should try to reduce the size of the charging port.

5.6.4 Wet Scrubber various parts of the device should not be leaking.

5.6.5 should be set on the bellows duct or vent port, vent pressure release rate should ensure that the structure is not damaged, the operator should not be dangerous.

5.6.6 in the instructions for use should be at least the following safety instructions in the use of the site should be set to the appropriate content of the warning signs.

a) In the charging port at the easy escape of carbon monoxide and other harmful gases, which should be noted.

--- Cupola furnace kept intact;

--- Enhance ventilation at the feeding platform;

--- Coke and other raw materials should not be open storage, should be kept dry;

--- Feed platform guardrails should be intact, avoid accidental fall;

--- Should be above the roof open vent or skylight before charging port, especially when the filter is located in the roof.

b) Under certain conditions, the cupola and the molten liquid metal will have a risk of explosion, which should be noted.

--- After the furnace body to be naturally cooled in order to clean up the cupola, if necessary, cooling the blast, but the water should not be chilled;

6.4 Calculation method of determining or viewing pattern

3 Or using the calculated pattern to analyze and check the cupola and feeding machine meets the requirements for certain specific requirements (such as stability, the center of gravity Set, mechanical strength, etc.) This technique is useful. If only by calculation or pattern we can not draw definitive conclusions, given the

6.5 method press.

6.5 Observe the method of determining

4 Through the provision of parts was measured visually check the cupola, whether the feeder must have requirements and performance. NOTE. To observe the review includes checking or cupola, feeding machine usage information.

7.1 Warning Messages

7.2 cupola, feeder visual signal (such as Flash), audible signal (eg alarm) device shall comply with GB/T 15706.2- 2007

6.3 requirements.

7.2 Mark

7.2.1 signs, symbols (pictograms), text warnings should be consistent with GB/T 15706.2-2007

6.4 and related standards.

7.2.2 Cupola should indicate the following information.

a) manufacturer and supplier (if necessary) the name and address;

b) Year of manufacture;

d) serial number;

e) various signals and warning devices (such as flash, alarms), sign, text warnings (such as liquid metal can lead to an explosion, burns, carbon Monoxide poisoning position);

f) cupola melting rate;

g) cupola dimensions, total weight and power;

h) handling instructions;

i) on the use of protective measures and work side constraints.

7.2.3 feeder should indicate the following information.

a) manufacturer and supplier (if necessary) the name and address;

b) Year of manufacture;

7.3 User's Guide

7.3.1 Instructions shall comply with GB/T 15706.2-2007 and

6.5 GB 9969.1 provisions.