CN102912114B - Method for oxidizing and roasting chromite with gas of silicomanganese electric furnace as fuel - Google Patents
Method for oxidizing and roasting chromite with gas of silicomanganese electric furnace as fuel Download PDFInfo
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- CN102912114B CN102912114B CN201210412390.4A CN201210412390A CN102912114B CN 102912114 B CN102912114 B CN 102912114B CN 201210412390 A CN201210412390 A CN 201210412390A CN 102912114 B CN102912114 B CN 102912114B
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Abstract
The invention provides a method for oxidizing and roasting chromite with gas of a silicomanganese electric furnace as fuel. The method comprises steps as follows: conveying electric furnace gas generated by producing silicomanganese to a gas pressure stabilizing cabinet through a gas pipeline; turning on and adjusting a flow adjusting valve after stabilizing pressure of the gas through the gas pressure stabilizing cabinet; conveying the gas into a gas burner; spraying the gas into a rotary kiln through the gas burner; transferring raw sodium chromate into the rotary kiln through a material bin at the tail of the kiln so as to move in direction opposite to negative pressure wind formed by a fan at the tail of the kiln; providing heat to the rotary kiln by flame of the electric furnace gas from the gas burner; controlling a reaction temperature to fully react a raw material; moving from the tail of the kiln to the head of the kiln; and transferring reacted clinker of sodium chromate to a next production process by a cooling cylinder. The method has the advantages of reducing gas emission, improving an energy utilization rate, and achieving a purpose of emission reducing and environment protecting; a variable frequency fan is adopted for adjusting the flame; a temperature and a position of a high temperature area are controlled, so that thermal regulation of the rotary kiln can be met.
Description
Technical field
The present invention relates to a kind of taking silicon-manganese alloy electric furnace coal gas as fuel the method for chromite oxidizing roasting.
Background technology
China's sodium chromate chamotte is produced most of calcination rotary kiln production technology that adopts at present, fuel generally uses the coal dust of high heating value to rotary kiln heat supply, in coal dust, calorific value is 27170～29260KJ/kg, ash content is 7～12%, volatilization is divided into 28～35%, and this fuel requirement secondary processing just can obtain granularity and carry out heat supply at the coal dust of 180 order left and right, processing environment is severe, contaminate environment; As Nonrenewable resources, the coal dust price of high heating value is higher, and Sodium chromate production cost is restricted; And the coal powder fraction of this high heating value is higher, affects quality product, it not the desirable thermal energy source that supplies.
In silicomanganese production process, produce a large amount of coal gas, along with the progress of the production-scale continuous expansion of silicomanganese and power-saving technology, all there is coal gas problem more than needed in most ferroalloy works, many enterprises are owing to restricted by regional environment, surplus gas does not have better utilised method, all diffuse, both wasted energy like this, again to environment.
Summary of the invention
The technical problem to be solved in the present invention be to provide a kind of taking silicon-manganese alloy electric furnace coal gas as fuel the method for chromite oxidizing roasting, utilize problem and pollution on the environment with what solve surplus gas, reach the object of energy-saving and emission-reduction.
Technical solution of the present invention is:
Taking silicon-manganese alloy electric furnace coal gas as fuel, for a method for chromite oxidizing roasting, its special character is:
1, by silicomanganese produce in produce electric furnace coal gas by gas pipeline transportation service to coal gas voltage stabilizing cabinet, coal gas is after coal gas voltage stabilizing cabinet steady pressure, by opening and adjust flux variable valve, coal gas to be sent in gas burner, coal gas is in gas burner sprays into rotary kiln;
2, Sodium chromate raw material enter in rotary kiln by kiln tailing storehouse, move with the eolian opposite direction of negative pressure that kiln tail blower fan forms, the electric furnace gas flame spraying by gas burner provides rotary kiln heat, controlling temperature of reaction is 1150～1200 DEG C, raw material are fully reacted, from the motion of kiln Caudad kiln hood direction, reacted sodium chromate chamotte enters next production process by cooling cylinder.
Described gas burner adopts two channels gas spray gun, and described two channels gas spray gun and the gas line use processing that is flexible coupling, so that the angle that enters kiln spray gun and length are regulated.
The outlet of described gas burner is along the circumferential direction provided with 12 swirl vanes, by swirl vane, flame profile is adjusted, after adjusting, flame moves to kiln hood direction, shorten high-temperature zone length, make the interior each humidity province of kiln distribute to meet and have calcium roasting requirement, and can reduce kiln end temperature, improve materials conversion rate.
Described kiln tail blower fan is frequency conversion fan, and by improving the wind speed of frequency conversion fan, flame shortens, and high-temperature zone is moved to kiln hood direction; By reducing the wind speed of frequency conversion fan, flame is elongated, and high-temperature zone is moved to kiln tail direction, sets requirement with the thermal technology who meets rotary kiln.
Described gas burner outlet position enters 1 meter～1.5 meters of kiln hood at rotary kiln.
When coal gas enters rotary kiln, pressure is 7000 Pa～9000Pa.
Described gas line diameter is 325mm.
The invention has the beneficial effects as follows: electricity consumption producer gas substitutes coal dust and carries out sodium chromate chamotte reaction as thermal source, set up coal gas voltage stabilizing cabinet, flow control valve, gas burner and corresponding gas line, coal gas enters fully burning in rotary kiln by said apparatus, and reduce coal gas discharge, improve energy utilization rate; Simultaneously can reduce the problem of environmental pollution that fire coal causes, reach the object of energy-conservation, reduction of discharging and environmental protection.Particularly use frequency conversion fan to regulate flame, control temperature and the position of high-temperature zone, can meet the thermal regulation of rotary kiln.
Brief description of the drawings
Fig. 1 is technological process schematic diagram of the present invention;
Fig. 2 is rotary kiln temperature of the present invention district distribution schematic diagram;
Fig. 3 is the structural representation of swirl vane of the present invention.
Embodiment
Embodiment 1
As shown in the figure, the gas pipeline transportation service that the electric furnace coal gas producing during silicomanganese is produced passes through φ 325 is extremely for stablizing the larger coal gas voltage stabilizing cabinet of pressure surge of metallurgical production process, coal gas is after coal gas voltage stabilizing cabinet steady pressure, by opening and adjust flux variable valve, coal gas is sent in gas burner, described gas burner adopts two channels gas spray gun, described two channels gas spray gun and gas line use the processing that is flexible coupling, gas exit pressure through gas burner is 7000 Pa～8000Pa, gas burner outlet position enters 1.0 meters of of kiln hood in rotary kiln, gas flame is output zone in gas burner sprays into rotary kiln, rotary kiln heat is provided, 2.3 × 32 meters of rotary kiln size φ, and in the outlet 1 of gas burner, 12 swirl vanes 2 are installed, by swirl vane 2, flame profile is adjusted into torch-shaped, after adjusting, electric furnace gas flame moves to kiln hood direction, shorten high-temperature zone length, make interior four humidity provinces (cooling zone, high-temperature zone, resolver, preheating zone) of kiln distribute to meet and have calcium roasting requirement, kiln tail blower fan adopts frequency conversion fan, by frequency conversion fan, flame is regulated, make 4 meters～5 meters of the lengths of flame, controlling high-temperature zone temperature is 1150 DEG C～1200 DEG C, makes 5 meters～6 meters of high-temperature zone positional distance kiln hood.By improving the wind speed of frequency conversion fan, flame shortens, and high-temperature zone is moved to kiln hood direction; By reducing the wind speed of frequency conversion fan, flame is elongated, and high-temperature zone is moved to kiln tail direction, sets requirement with the thermal technology who meets rotary kiln.
Sodium chromate raw material enter in rotary kiln and to kiln hood direction and move from kiln tailing storehouse, move with the eolian opposite direction of negative pressure that kiln tail blower fan forms, through 30 minutes arrival high-temperature zones, carry out the oxidizing roasting reaction of violent (fully) in high-temperature zone, temperature of reaction is controlled at 1150 DEG C～1200 DEG C, trivalent chromium conversion is become to sexavalent chrome, and transformation efficiency is 79.5%, and product consumption is at 1.16t/t Sodium chromate; Reacted sodium chromate chamotte enters next production process by cooling cylinder.
Embodiment 2
As shown in the figure, the gas pipeline transportation service that the electric furnace coal gas producing during silicomanganese is produced passes through φ 325 is extremely for stablizing the larger coal gas voltage stabilizing cabinet of pressure surge of metallurgical production process, coal gas is after coal gas voltage stabilizing cabinet steady pressure, by opening and adjust flux variable valve, coal gas is sent in gas burner, described gas burner adopts two channels gas spray gun, described two channels gas spray gun and gas line use the processing that is flexible coupling, gas exit pressure through gas burner is 8000 Pa～9000Pa, gas burner outlet position enters 1.5 meters of of kiln hood at rotary kiln, gas flame is output zone in gas burner sprays into rotary kiln, rotary kiln heat is provided, 2.3 × 32 meters of rotary kiln size φ, and in the outlet 1 of gas burner, 12 swirl vanes 2 are installed, by swirl vane 2, flame profile is adjusted into torch-shaped, after adjusting, electric furnace gas flame moves to kiln hood direction, shorten high-temperature zone length, make interior four humidity provinces of kiln distribute to meet and have calcium roasting requirement, kiln tail blower fan adopts frequency conversion fan, by frequency conversion fan, flame is regulated, make 5 meters～6 meters of the lengths of flame, controlling high-temperature zone temperature is 1150 DEG C～1200 DEG C, makes 6.5 meters～7.5 meters of high-temperature zone positional distance kiln hood.By improving the wind speed of frequency conversion fan, flame shortens, and high-temperature zone is moved to kiln hood direction; By reducing the wind speed of frequency conversion fan, flame is elongated, and high-temperature zone is moved to kiln tail direction, sets requirement with the thermal technology who meets rotary kiln.
Sodium chromate raw material enter in rotary kiln and to kiln hood direction and move from kiln tailing storehouse, move with the eolian opposite direction of negative pressure that kiln tail blower fan forms, through 35 minutes arrival high-temperature zones, carry out the oxidizing roasting reaction of violent (fully) in high-temperature zone, temperature of reaction is controlled at 1150 DEG C～1200 DEG C, trivalent chromium conversion is become to sexavalent chrome, and transformation efficiency is 81.4%, and product consumption is at 1.13t/t Sodium chromate; Reacted sodium chromate chamotte enters next production process by cooling cylinder.
Embodiment 3
As shown in the figure, the gas pipeline transportation service that the electric furnace coal gas producing during silicomanganese is produced passes through φ 325 is extremely for stablizing the larger coal gas voltage stabilizing cabinet of pressure surge of metallurgical production process, coal gas is after coal gas voltage stabilizing cabinet steady pressure, by opening and adjust flux variable valve, coal gas is sent in gas burner, described gas burner adopts two channels gas spray gun, described two channels gas spray gun and gas line use the processing that is flexible coupling, gas exit pressure through gas burner is 7500 Pa～8500Pa, gas burner outlet position enters 1.2 meters of of kiln hood at rotary kiln, gas flame is output zone in gas burner sprays into rotary kiln, rotary kiln heat is provided, 2.3 × 32 meters of rotary kiln size φ, and in the outlet 1 of gas burner, 12 swirl vanes 2 are installed, by swirl vane 2, flame profile is adjusted into torch-shaped, after adjusting, electric furnace gas flame moves to kiln hood direction, shorten high-temperature zone length, make interior four humidity provinces of kiln distribute to meet and have calcium roasting requirement, kiln tail blower fan adopts frequency conversion fan, by frequency conversion fan, flame is regulated, make 4.5～5.5 meters of the lengths of flame, controlling high-temperature zone temperature is 1150 DEG C～1200 DEG C, makes 5.7 meters～6.7 meters of high-temperature zone positional distance kiln hood.By improving the wind speed of frequency conversion fan, flame shortens, and high-temperature zone is moved to kiln hood direction; By reducing the wind speed of frequency conversion fan, flame is elongated, and high-temperature zone is moved to kiln tail direction, sets requirement with the thermal technology who meets rotary kiln.
Sodium chromate raw material enter in rotary kiln and to kiln hood direction and move from kiln tailing storehouse, move with the eolian opposite direction of negative pressure that kiln tail blower fan forms, through 32 minutes arrival high-temperature zones, carry out the oxidizing roasting reaction of violent (fully) in high-temperature zone, temperature of reaction is controlled at 1150～1200 DEG C, trivalent chromium conversion is become to sexavalent chrome, and transformation efficiency is 81.8%, and product consumption is at 1.10t/t Sodium chromate; Reacted sodium chromate chamotte enters next production process by cooling cylinder.
Claims (2)
- Taking silicon-manganese alloy electric furnace coal gas as fuel for a method for chromite oxidizing roasting, it is characterized in that:1.1, by silicomanganese produce in produce electric furnace coal gas by gas pipeline transportation service to coal gas voltage stabilizing cabinet, coal gas is after coal gas voltage stabilizing cabinet steady pressure, by opening and adjust flux variable valve, coal gas is sent in gas burner, described gas burner adopts two channels gas spray gun, and described two channels gas spray gun and gas line use the processing that is flexible coupling, so that the angle that enters kiln spray gun and length are regulated, coal gas is in gas burner sprays into rotary kiln, when coal gas enters rotary kiln, pressure is 7000 Pa～9000Pa, described gas burner outlet position enters 1 meter～1.5 meters of kiln hood at rotary kiln,1.2, Sodium chromate raw material enter in rotary kiln by kiln tailing storehouse, and with the eolian opposite direction motion of negative pressure that kiln tail blower fan forms, described kiln tail blower fan is frequency conversion fan, and by improving the wind speed of frequency conversion fan, flame shortens, and high-temperature zone is moved to kiln hood direction, by reducing the wind speed of frequency conversion fan, flame is elongated, high-temperature zone is moved to kiln tail direction, set and require the electric furnace gas flame that sprays by gas burner that rotary kiln heat is provided to meet the thermal technology of rotary kiln, controlling temperature of reaction is 1150～1200 DEG C, raw material are fully reacted, move from kiln Caudad kiln hood direction, reacted sodium chromate chamotte enters next production process by cooling cylinder, the outlet of described gas burner is along the circumferential direction provided with 12 swirl vanes, by swirl vane, flame profile is adjusted, after adjusting, flame moves to kiln hood direction, shorten high-temperature zone length, make the interior each humidity province of kiln distribute to meet and have calcium roasting requirement.
- According to claim 1 taking silicon-manganese alloy electric furnace coal gas as fuel for the method for chromite oxidizing roasting, it is characterized in that: described gas line diameter is 325mm.
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| CN201210412390.4A CN102912114B (en) | 2012-10-25 | 2012-10-25 | Method for oxidizing and roasting chromite with gas of silicomanganese electric furnace as fuel |
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| CN201210412390.4A CN102912114B (en) | 2012-10-25 | 2012-10-25 | Method for oxidizing and roasting chromite with gas of silicomanganese electric furnace as fuel |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101709369A (en) * | 2009-08-21 | 2010-05-19 | 新疆沈宏集团股份有限公司 | Method for jointly producing chromium salt and ferrochromium alloy by sintering with wet and fire methods |
| CN102041400A (en) * | 2011-01-12 | 2011-05-04 | 董亚飞 | Process and equipment for producing high-content manganese silicon alloy from low-grade ferromanganese ore |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101709369A (en) * | 2009-08-21 | 2010-05-19 | 新疆沈宏集团股份有限公司 | Method for jointly producing chromium salt and ferrochromium alloy by sintering with wet and fire methods |
| CN102041400A (en) * | 2011-01-12 | 2011-05-04 | 董亚飞 | Process and equipment for producing high-content manganese silicon alloy from low-grade ferromanganese ore |
Non-Patent Citations (2)
| Title |
|---|
| "30MVA锰硅电炉煤气干式净化系统扩容实践";唐凤初等;《铁合金》;20061231(第5期);第41-43页 * |
| 唐凤初等."30MVA锰硅电炉煤气干式净化系统扩容实践".《铁合金》.2006,(第5期),第41-43页. |
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