Technical specification for industrial hygiene and

2022-07-26
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Technical specification for industrial health and safety of glass factory (IV)

5.5 tank furnace hot repair

5.5.1 the pipe tools used in hot repair must be provided with exhaust holes, which shall not be left in the water immersion cooling section

5.5.2 it is forbidden for hot repairmen to wear chemical fiber products during operation. When hot repair is carried out in areas above 50 ℃, they should wear heat-resistant protective clothing and other protective articles

the labor protection articles worn during hot repair shall not be tied

5.5.3 during the replacement of tank wall bricks, the kiln temperature and pressure shall be properly reduced compared with the normal operation. Before replacement, if the pool wall bricks are too thin, flower plates (iron plates) must be attached temporarily to prevent the leakage of glass liquid. When replacing new bricks, pay attention to changing the fire, and make the bricks and joints between the new and old bricks face to face, so as to prevent the arms on both sides from walking inward when pushing new bricks

the tank wall must be ventilated immediately after the tank wall bricks are topped, then the steel parts shall be removed, the tank wall angle steel shall be fixed firmly in time, the normal kiln air duct shall be installed and cooled by blowing

5.5.4 before hot repair of the regenerator, a water-cooled RAM with reliable water source shall be inserted between the regenerator and the small furnace, and then the regenerator door and lattice bricks shall be removed and replaced. The new lattice bricks shall be stacked in Siemens type

5.5.5 before cleaning and inspection of lower flue, the control circuit of flame reversing must be cut off to eliminate the possibility of reversing mechanism action; Workers under the flue shall wear safety helmets, gas masks and ropes for rescue. Special personnel shall be assigned to supervise the flue

5.5.6 when inspecting the arch or cleaning the arch top, the operator shall stand on the metal platform on the arch top, and more than 2 people shall operate at the same time

5.6 full electric melting and electric auxiliary heating kiln

5.6.1 in areas with abundant power resources, or when melting glass containing high volatile components, glass with poor diathermal radiation and refractory glass, full capacitance or electric auxiliary heating technology should be adopted

5.6.1.1 all electric melting technology should be adopted for the melting of borosilicate glass, milky white glass, lead crystalline glass and other glass containing high volatile components

5.6.1. In terms of filtration, catalyst and coating in the manufacturing industry, the electric auxiliary heating technology should be used in the melting area, clarification area, working port of the flow hole and the material path of the 2 tank furnace

electric heating should be adopted for tin bath and annealing kiln of float process; Electric heating technology can also be used for flat drawing annealing kiln when conditions permit

when electric heating is adopted, the working pool shall be installed with grounding electrode

5.6.2 the cables of each electrode shall be laid separately, and the insulation of cables, electrode supports and furnace steel structures shall be good. High current cable bridges and perforations shall be provided with measures to prevent eddy current heating. The electrode support shall be insulated from the kiln body and the ground, and shall be equipped with protective devices made of glass fiber or inorganic fiber

5.6.3 the electrode joint area includes the corresponding tank side wall or tank bottom. The electrical operation area shall be delimited by a fence, and an indication or warning sign shall be set

5.6.4 when the furnace is running, the maintenance of the live parts (such as loosening the threaded joint, adjusting the electrode, etc.) should be carried out under the power-off state, and the main switch and isolating switch on the electrode power supply line must be used for opening

5.6.5 the soft water pipe for cooling shall be a rubber hose with a pressure of not less than 0.5MPa, and shall be isolated from the electrical equipment at the use part through the insulation section, with a resistance of not less than 10k. When the pipe diameter is 25mm, the insulation length shall not be less than 2m

5.6.6 the discharge port, sampling or operation door of electric furnace or electric auxiliary furnace shall be far away from the electrode to minimize the voltage to the ground

5.6.7 operators shall be trained, and shall use insulating tools, wear insulating protective articles and operate on insulating pads

5.6.8 the electric furnace must be equipped with grounding electrode to monitor the change of grounding current. The grounding current should be interlocked with the alarm and the emergency disconnection of the main switch (load switch); A ground voltage measuring device is set to monitor the ground voltage of each electrode

5.7 crucible kiln

5 The new GX RTF clearjet injector 7.1 crucible kiln should adopt the heat exchange crucible kiln burning high calorific value fuel; Semi gas or direct fired crucible kilns should be phased out

5.7.2 the kiln top (furnace cover) shall be reinforced with kiln hoops along the kiln side bricks, and the upper part of the kiln top shall be provided with a heat exhaust hood

5.7.3 a lifting water curtain heat insulation and cooling device or heat insulation baffle shall be installed outside the kiln wall

5.7.4 for the oil burning heat exchange inverted flame kiln, the installation position of the oil gun shall ensure that the highest temperature point is in the center of the kiln chamber, the combustion is complete, the fire nozzle is not easy to burn, and the oil gun is easy to load and unload

5.7.5 there shall be at least 6m working area around the crucible kiln where the fastening screws are tightened after adjustment; The operation site shall be equipped with air supply and cooling facilities

5.7.6 a crane or other mechanical device must be used to transfer the hot crucible containing liquid glass. The crucible must be kept stable during moving, and the moving line must be kept unobstructed. It is not allowed to pass over the operators

5.7.7 when removing the hot glass liquid from the crucible, a special long handle tool must be used

6 forming and annealing

6.1 General requirements

6.1.1 the forming and annealing equipment in operation shall not be adjusted, repaired or operated on the equipment in operation without accurate and feasible safety guarantee

6.1.2 warehouses (tanks, drums, cars) for placing broken glass shall be set at the parts where broken glass is produced, such as the float cold end system, the lead-up machine of the lead-up method, the daily glass forming machine and the annealing kiln; The warehouse opening set at the floor shall be provided with a grid to prevent personnel from falling

6.1.3 when cleaning broken glass and other sundries from the open part of annealing furnace, special tools (hook, scraper, brush, etc.) shall be used to operate at a proper distance

6.2 flat glass forming

6.2.1 float forming

6.2.1.1 for the width of the tin bath plant, the operation area for inserting or pulling out edge pullers, row cooler, cooling water package, etc. on both sides of the tin bath shall be considered. The clear distance from the outside of the tin bath to the inner wall of the plant is 6-8m

6.2.1.2 the overall structure of the tin bath shall be tight, the design and calculation of its steel structure shall comply with the relevant provisions of GBJ1788 code for design of steel structures, and the influence of expansion deformation under high temperature working conditions shall be considered

a. the trough bottom is made of refractory bricks or sintered refractory concrete, and the outside is sealed with steel shell; The outside of fixed breast wall shall be sealed with steel plate; The upper part of the top cover adopts a sealing cover

b. the operating hole and observation hole shall be sealed tightly

6.2.1.3 a safety ram made of heat-resistant steel and an adjusting ram made of refractory shall be set on the flow channel in front of the tin bath; The safety ram requires fast and flexible lifting, which can be manually and automatically controlled; The adjusting ram shall be equipped with a lifting height display device

6.2.1.4 the bath shielding gas is a mixture of nitrogen and hydrogen. The hydrogen content in the mixture shall be 5%-10% (by volume ratio) and the service pressure shall be kPa. When stopping gas, stop hydrogen first and then stop nitrogen

6.2.1.5 operators shall wear protective equipment and shall not use aluminum or aluminum alloy tools when adding tin to the bath, sampling and cleaning the oxide on the surface of the tin liquid. Tin feeding tools and tin ingots shall not contact with water

6.2.1.6 do not touch the heating element on the top of the bath during operation

6.2.1.7 the front and rear ends of the tin bath can be cooled by water, air or nitrogen, and the bottom of the bath should be air cooled

the bath cooling fan should be arranged at the bottom floor of the bath plant or the bottom floor of the melting section, and should be relatively concentrated. Shock absorption and noise reduction facilities should be provided

6.2.1.8 in case of sudden power and water cut-off during the operation of the tin bath, immediately drop the safety ram and set the main drive to the zero position, and then quickly pull out the cooling water pipe, edge puller and edge guard wheel in the tin bath (if the power is cut off for a short time without water cut-off, it is not necessary to pull out)

6.2.1.9 the tin bath should adopt the technology of automatic tin discharge or siphon tin discharge instead of manual scooping

6.2.2 flat drawing forming

6.2.2.1 a certain area shall be reserved at the side of the forming room and the drive station of the flat drawing unit, which is the operation area for changing the steering roll and flat drawing roll without stopping the furnace

6.2.2.2 the steering roll and flat drawing roll are made of heat-resistant steel and air-cooled. The steering roll shall be able to lift up and down and move back and forth

6.2.2.3 the flat drawing unit shall be equipped with non-stop furnace roll change, rapid polishing, edge running and plate breaking alarm, and the steering roll shall be able to rise and fall, and move back and forth

6.2.2.4 the brick kiln should be set on the same floor of the forming room

6.2.2.5 mobile air supply and cooling facilities should be set in the operation area when changing the steering roll or flat drawing roll

6.2.3 lead up forming

6.2.3.1 the clear distance before leading to the upper chamber shall not be less than 8.5m, and the clear distance after leading to the upper chamber shall not be less than 4.8m. The space height of the trimming floor shall not be greater than 3.3m, and the distance from the bottom chord of the roof truss of the mining floor to the top surface of the lead-in machine shall not be less than 5m. The arrangement of beams and columns shall not affect the production operation

6.2.3.2 when determining the relative height position between the trimming floor and the lead-in machine, it shall be convenient to open the side door of the lead-in machine, clean the broken glass and replace the asbestos roller

6.2.3.3 the opening of the floor around the lead-in machine shall meet the installation and maintenance requirements; Protective cover plate shall be added between the lead-in machine and the surrounding floor slab

6.2.3.4 the design and installation of the lead-in machine shall ensure that the drive of the lead-in machine is stable during operation, which is convenient for cleaning broken glass, and the broken glass is not easy to fall into the lead-in room; The annealing belt leading to the chamber shall have good sealing

6.2.3.5 the control of the glass index temperature of the steamed bread arch should be strengthened for the grooved method, and the control of the depth of the glass flow layer should be strengthened for the grooved method. In the process of glass cooling, the heat preservation of the upper kiln and the machine chamber should be strengthened, and the edge fire should be reasonably configured. Adjust the cooling water temperature and quantity to reduce the cracking of glass during the gradual cooling process and ensure the stability of production

6.2.3.6 for the gasoline gasification chamber set up to supply the fuel gas for edge burning and cracking, the main gasoline supply pipe must be equipped with a flame arrester

6.2.3.7 the reversing switch of the thyristor speed regulating device of the lead-in machine must be marked conspicuously; There must be a specially assigned person to be responsible for the electrical switch or hang eye-catching signs when the machine is stopped for maintenance or commissioning

6.3 daily glass forming

6.3.1 General requirements

6.3.1.1 large quantities of ordinary hollow glass products (bottles, vessels, instruments, bulbs, thermos bottles, etc.) shall be formed by continuous machines with a high degree of automation that can be used for experiments and data processing according to GB, ISO, JIS, ASTM, DIN and various standards provided by users; Special products with small batch can be formed by hand

6.3.1.2 the forming machine shall be set at the high span of the melting workshop. When the melting workshop is arranged in two layers, the height of the forming machine installation floor (two layers) shall not be less than 4.2m

6.3.1.3 when the gas fuel premixed manifold is used for heating the material path, the air supply pipe shall be installed with an anti backfire safety device composed of pressure switch and solenoid valve or a backfire protection device composed of blasting head and solenoid valve; When electric heating is adopted for the material path, the provisions of relevant clauses in section 5.6 of this specification shall be implemented

6.3.1.4 the material basin, bowl, punch and barrel of the feeder should be made of high-quality refractory products. Ceramic fibers with low thermal conductivity or other thermal insulation materials should be used around the material basin and between the material basin and the iron shell for thermal insulation

6.3.1.5 the feeder platform should be made of checkered steel plate with a width of not less than 1.2m, and the platform edge should be provided with protective railings and retaining edges; The escalator passing through the feeder platform from the ground where the forming machine is located shall be a steel anti-skid inclined ladder

6.3.1.6 the diameter of the discharge chute of the feeder when producing small and medium-sized hollow glass products; The single drop shall not be less than 200mm, and the drop shall not be less than 280mm; The slope shall not be less than 40

6.3.1.7 the layout of the forming machine shall ensure

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