CN1394667A - Method for treating smoke produced by carbide - Google Patents
Method for treating smoke produced by carbide Download PDFInfo
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- CN1394667A CN1394667A CN 02112330 CN02112330A CN1394667A CN 1394667 A CN1394667 A CN 1394667A CN 02112330 CN02112330 CN 02112330 CN 02112330 A CN02112330 A CN 02112330A CN 1394667 A CN1394667 A CN 1394667A
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- flue gas
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Abstract
The method for treating flue gas produced by carbide furnace includes the following steps: making the above-mentioned flue gas containing lots of CaO and C dust and small quantity of SO2 feed into conditioning equipment to make desulfurization, its condition includes: water pressure is 2.0-4.0 MPa, water flow is 500-2000 kg/h, flue gas outlet temp. is below 90-130 deg.c, furnace negative pressure is -5 - -20Pa, and its regulated specific resistance is 10 to the power 8-10 to the power 10 ohm.cm, then feeding the flue gas into electric dust remover, its condition includes: single electric field votlage is 50-65 KV, current is 200-600 mA, two electric field voltage is 40-60 KV, current is 300-500 mA, making tail gas pass through draught fan and regulating air volume to 12X10 to the power 4-24X10 to the power 3/h., then feeding the flue gas into chimney to discharge into atmosphere.
Description
Technical Field
The invention relates to a method for treating flue gas generated in calcium carbide production.
Background
In the production of calcium carbide, bag dust removal and wet dust removal are known in the flux of flue gas. The two methods have high operation cost and large resistance, and the wet dust removal also has the defects of large occupied area, large consumption of water resources, high difficulty in sewage treatment, serious equipment corrosion problem, poor high-temperature and spark resistance of cloth bag dust removal and frequent cloth bag replacement. And because the dust produced by the calcium carbide contains a large amount of CaO, Ca (OH) is generated by digestion in water2Alkalinity, high viscosity, difficult dust settling, and the need to neutralize and settle the solid suspension. The flue gas produced by calcium carbide quicklime contains a small amount of sulfide, and H is easily produced under the condition of high temperature2S、H2SO3、H2SO4Solution, severely corroding equipment. Because the flue gas temperature fluctuation of calcium carbide production is big, instantaneous temperature changes along with the furnace condition, often exceeds standard and fails in time to adjust the phenomenon, smuggle spark in the coke entrainment spark of smuggleing incompletely burning in the flue gas moreover, because the limit of sack high temperature resistance and fire resistance, make the sack life-span greatly reduced, change cycle is once every year under the normal condition, cost very big. Therefore, a better method for treating the smoke generated by the calcium carbide is proposed to reduce the equipment resistance and the operation cost of the device, and the problems of corrosion, dust adhesion, frequent maintenance, high cost, high power consumption of a draught fan, water pollution, high water consumption and the like of the device can be effectively solved.
Disclosure of Invention
The invention aims to provide a method for treating flue gas generated in calcium carbide production.
The method for treating the flue gas generated in calcium carbide production comprises the steps of treating a large amount of CaO and C dust and a small amount of SO2The flue gas of the calcium carbide furnace enters a conditioner for desulfurization, wherein the conditioning conditions are as follows: the water pressure is 2.0-4.0 Mpa, the water amount is 500-2000 kg/h, the temperature of a flue gas outlet is 90-130 ℃, the negative pressure in the furnace is-5-20 Pa, and the specific resistance is adjusted to be 108～1010After omega cm, the mixture enters an electric dust collector, the dust collection electric dust collection conditions are single electric field voltage of 50-65 kV, current of 200-400 mA, two electric field voltage of 40-60 kV and current of 300-500 mA, and the air volume of tail gas is adjusted to 12 multiplied by 10 by an induced draft fan4～24×104m3/h, directly emptying the chimney; the dust collected by the dust collector is conveyed to a dust collecting hopper by a screw and is periodically sent out by a dust vehicle.
The invention has the advantages of little water consumption, no corrosion to equipment, simple maintenance, low equipment resistance below 1/5, low operation cost below 1/3, and low smoke emission standard of less than 50mg/m3。
Drawings
The attached drawing is a flow chart of a flue gas treatment method in calcium carbide production.
Detailed Description
The method for treating the flue gas generated in calcium carbide production comprises the steps of treating a large amount of CaO and C dust and a small amount of SO2The flue gas of the calcium carbide furnace enters a conditioner for desulfurization, wherein the conditioning conditions are as follows: the water pressure is 2.0-4.0 Mpa, the water amount is 500-2000 kg/h, the temperature of a flue gas outlet is 80-120 ℃, the negative pressure in the furnace is-3-18 Pa, and the specific resistance is adjusted to be 108～1010After omega.cm, the mixture enters an electric dust collector, the dust collection electric dust collection requirements are single electric field voltage 35-55 kV, current 3500mA, two electric field voltage 35-50 kV and current 250-450 mA, and the air volume of tail gas is adjusted to 12 multiplied by 10 by an induced draft fan4～24×104m3/h, directly emptying the chimney; the dust collected by the dust collector is conveyed to a dust collecting hopper by a screw and is periodically discharged by a dust vehicleAnd (5) feeding.
The tail gas fan adjusts the temperature of the inlet flue gas to 150-350 ℃ by frequency conversion, the pressure is-5 to-20 Pa, and the emission concentration of the smoke dust is less than or equal to 50mg/m3。
The present invention will be described in detail with reference to examples.
1) Calcium carbide production method
The calcium carbide production raw material CaO and coke react at the high temperature of 1800-2200 ℃ by means of arc heat and resistance heat to prepare calcium carbide. The reaction formula is as follows:
the open calcium carbide furnace and the calcium carbide furnace waste heat boiler thereof are accompanied by the following reactions:
the reaction process consumes a large amount of heat energy and releases part of N2，CO2，CO，SO2When the gas is the calcium carbide furnace flue gas, the flue gas dust is taken away at the temperature of 150-600 ℃, part of heat is also taken away, part of raw materials are consumed, and the three wastes are generated.
2) Calcium carbide production flue gas treatment method
Will contain a large amount of CaO and C dust and a small amount of SO2The flue gas of the calcium carbide furnace enters a conditioner for desulfurization, wherein the conditioning condition is that the negative pressure in the furnace is-5 to-20 Pa at the temperature of 90 to 130 ℃, and the specific resistance is adjusted to be 108～1010After omega cm, the mixture enters an electric dust collector, the electric dust collection conditions are single electric field voltage of 50-65 kV, current of 400mA, two electric field voltage of 40-60 kV and current of 300-500 mA, and the air volume of tail gas is adjusted to 12 multiplied by 10 by an induced draft fan4～24×104m3After the reaction is carried out for one hour, the reaction kettle is delivered to a chimney to be directly emptied; the dust collected by the dust collector is conveyed to a dust collecting hopper by a screw and is periodically sent out by a dust vehicle.
When the calcium carbide furnace or the dust removal system breaks down, the method sets an emergency discharge facility.
Example 1
The flue gas treatment method is implemented according to a flow chart, a simple spray head is used, an electric field carries liquid, and the dust content of outlet flue gas is 300mg/m3。
The water quantity is 500kg/h
The water pressure is 2.5MPa
Current of 200mA
Voltage 50kV
The temperature of a smoke inlet is 250 DEG C
The temperature of a smoke outlet is 130 DEG C
Air volume regulation 180000m3/h
The dust content of the outlet flue gas is 43.5mg/m3
The dust removal efficiency is 96.6 percent
Example 2
Changing the conditions of example 1 according to the flow chart
The water quantity is 1200kg/h
The water pressureis 2.5MPa
The temperature of a smoke outlet is 138 DEG C
The temperature of the flue gas inlet is 210 DEG C
Voltage of dust collector 45kV
Precipitator current 420mA
Adjust the air quantity 220000m3/h
48.2mg/m of dust in outlet flue gas3
The dust removal efficiency is 95 percent
Example 3
Conditions were varied as in example 1
The water quantity is 1350kg/h
The water pressure is 3.0Mpa
The temperature of a smoke inlet is 280 DEG C
The temperature of a smoke outlet is 138 DEG C
Voltage 56kV of dust remover
Precipitator current 460mA
Regulating air quantity 140000m3/h
The dust content of the outlet flue gas is 41mg/m3
The dust removal efficiency is 97.5 percent
Example 4
Conditions were varied as in example 1
The water quantity is 600kg/h
The water pressure is 3.8Mpa
Voltage of dust collector 60kV
Dust collector current 500mA
The temperature of a smoke inlet is 260 DEG C
The temperature of a smoke outlet is 100 DEG C
The dust content of the outlet flue gas is 36.2mg/m3
Air volume adjusting 170000m3/h
The dust removal efficiency is 99.4 percent
Comparative example 3
In example 4, the electric field was stabilized during the operation by changing the water pressure and reducing the amount of water in the same manner as in example 1 except that the temperature was not changed.
Claims (4)
1. A method for treating the fume generated by calcium carbide features that the fume containing CaO and C and SO is used to treat the fume2The flue gas of the calcium carbide furnace enters a conditioner for desulfurization, wherein the conditioning conditions are as follows: the water pressure is 2.0-4.0 Mpa, the water quantity is 500-2000 kg/h, the temperature of a flue gas outlet is 90-130 ℃, the negative pressure in the furnace is-5-20 Pa, and the specific resistance is adjusted to be 108～1010After omega cm, the mixture enters an electric dust collector, the dust collection electric dust collection conditions are single electric field voltage of 50-65 kV, current of 200-400 mA, two electric field voltage of 40-60 kV and current of 300-500 mA, and the air volume of tail gas is adjusted to 12 multiplied by 10 by an induced draft fan4～24×104m3After the reaction is carried out for one hour, the reaction kettle is delivered to a chimney to be directly emptied; the dust collected by the dust collector is conveyed to a dust collecting hopper by a screw and is fixed by a dust vehicleAnd (5) delivering the medicine outside.
2. The method for treating the flue gas generated in the calcium carbide production according to claim 1, wherein the conditioning conditions are that the negative pressure in the furnace is-3 to-18 Pa at80 to 120 ℃.
3. The method for treating the flue gas generated in the calcium carbide production according to claim 1, wherein the electric dust collection requirements are a single electric field voltage of 45-65 kV, a current of 200-350 mA, a voltage of 40-60 kV and a current of 300-500 mA.
4. The method for treating the flue gas generated in the calcium carbide production according to claim 1, wherein the temperature of the flue gas at the inlet of the tail gas fan is adjusted by frequency conversion to be 150-350 ℃, the pressure is-5-20 Pa, and the emission concentration of the flue gas is less than or equal to 50mg/m3。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02112330 CN1394667A (en) | 2002-06-28 | 2002-06-28 | Method for treating smoke produced by carbide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02112330 CN1394667A (en) | 2002-06-28 | 2002-06-28 | Method for treating smoke produced by carbide |
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| CN1394667A true CN1394667A (en) | 2003-02-05 |
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| CN 02112330 Pending CN1394667A (en) | 2002-06-28 | 2002-06-28 | Method for treating smoke produced by carbide |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100427391C (en) * | 2006-09-30 | 2008-10-22 | 宁夏英力特电力集团股份有限公司 | Tail gas treatment and reutilization for calcium carbide stove |
| CN100427390C (en) * | 2006-02-24 | 2008-10-22 | 昆明理工大学 | Method of purifying furnace gas of closed calcium carbide furnace |
| CN105060294A (en) * | 2015-07-20 | 2015-11-18 | 常州市好利莱光电科技有限公司 | Method for purifying and recovering CO in tail gas of calcium carbide furnace |
-
2002
- 2002-06-28 CN CN 02112330 patent/CN1394667A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100427390C (en) * | 2006-02-24 | 2008-10-22 | 昆明理工大学 | Method of purifying furnace gas of closed calcium carbide furnace |
| CN100427391C (en) * | 2006-09-30 | 2008-10-22 | 宁夏英力特电力集团股份有限公司 | Tail gas treatment and reutilization for calcium carbide stove |
| CN105060294A (en) * | 2015-07-20 | 2015-11-18 | 常州市好利莱光电科技有限公司 | Method for purifying and recovering CO in tail gas of calcium carbide furnace |
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