Dry method dust collecting technique for ferromolybdenum smelting flue gas

A technology for smelting flue gas and ferromolybdenum, applied in the direction of dust removal, separation methods, cleaning methods and appliances, etc., can solve the problems of flue gas not meeting emission requirements, corrosion of fans and pipeline equipment, easy blockage of spraying devices, etc. Achieve the effects of easy processing and matching, easy processing and convenient management

Inactive Publication Date: 2008-01-23
LIAONING CHENGUANG ENVIRONMENT ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1) The dust collection efficiency is low, the dust concentration in the exhaust gas is high, a large amount of material is lost, and the flue gas cannot meet the emission requirements of the national or local environmental protection department
[0007] 2) The spray devices installed in the Venturi tube and the leaching tower are easy to block, and the system is unstable, requiring frequent cleaning and maintenance, and the workload is heavy
[0008] 3) The treated flue gas contains water, which seriously corrodes the fan and pipeline equipment

Method used

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  • Dry method dust collecting technique for ferromolybdenum smelting flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] As shown in Figure 2, the flue gas produced by the ferromolybdenum smelting furnace is collected by the gas collection hood and then enters the U-shaped tube cooler for natural cooling and cooling. The gas collection hood can be an umbrella-shaped cover with a square or circular cross section. The sectional area of ​​the air inlet of the gas collecting hood is 3 to 4 times that of the upper sectional area of ​​the smelting furnace, and the height of the hood is designed with reference to the relevant design manual. The installation position of the gas collecting hood is directly above the smelting furnace and 0.8-1.2m away from the furnace mouth. The gas velocity at the inlet of the gas collecting hood is 1-2.5m / s. At this time, the flue gas temperature at the inlet is 500-700°C, and the smoke concentration is 80-100g / mN 3 . The U-shaped cooler can be arranged according to the actual situation of the project site. The heat dissipation area should be designed to reduc...

Embodiment 2

[0034] The flue gas produced by the ferromolybdenum smelting furnace is collected by the gas collecting hood and then enters the U-shaped tube cooler for natural cooling and cooling. The diameter of the upper opening of the ferromolybdenum smelting furnace is φ2.0m. The air collecting hood can be an umbrella cover with a square or circular cross section. The cross-sectional area of ​​the inlet of the gas collecting hood is 3.5 times that of the furnace mouth, the inlet size of the gas collecting hood is determined to be 3.32m×3.32m, the installation height is 1.0m, and the inlet gas velocity is taken as 2.0m / s. At this time, the flue gas temperature at the inlet of the hood is 650°C, and the flue gas volume is 23500mN 3 / h.

[0035] The U-shaped cooler can be arranged according to the actual situation of the project site. The heat dissipation area should be designed to reduce the flue gas temperature to 120-250°C, and the resistance should be controlled at 900-1100Pa. To fa...

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Abstract

A ferromolybdenum smelting smoke and gas dry method dust collection technics, which solves the problems that the existing wet method dust collection has low dust collection efficiency, the smoke and gas can't meet the environment protection requirements, the system runs unstably, take serious erosion to the fan and the pipeline equipment and the recycled material is not easy to store. The method is that: the smoke and gas produced by ferromolybdenum smelting furnace enters into a U-shaped cooling machine to lower temperature naturally by a gas skirt, and proceed dust collection by a bag dedusting machine and is discharged reaching the standard; the dust material collected by the bag falls into the dust hopper of the bag dust collection machine by pulse spraying and blowing, which is used for smelting to produce ferromolybdenum, the smoke and gas after dust collection is transferred into a chimney to discharge out. The advantages of the invention are that: the invention has low investment and small running expense, which is economic with obvious environment benefit, and has quick capital payoff, the material recycle efficiency can reach above 99.9 per cent; the discharged smoke and gas can meet the requirement of protecting environment; the management is convenient, the operation is simple and the running is stable; the erosion to the fan and the pipeline equipment is small, which prolongs the service life of the equipment; the dry power material can be recycled directly, and is easy to lay; the process mating is easy, the engineer occupies small space and is easy to arrange.

Description

technical field [0001] The invention particularly relates to a dry dust collection process for ferromolybdenum smelting flue gas. Background technique [0002] Ferromolybdenum smelting is an out-of-furnace smelting production process. Ferromolybdenum production is to mix molybdenum oxide with aluminum powder, saltpeter, ferrosilicon, iron beans, fluorite and other auxiliary materials in a certain proportion, and ignite the materials in a smelting furnace for smelting to obtain ferromolybdenum. [0003] The aluminum-iron smelting reaction is fast and intense, with a reaction time of 5 to 8 minutes. During the reaction process, the heat generated by the combustion of aluminum powder makes molybdenum oxide and iron form a molybdenum-iron alloy. The entire reaction process produces a large amount of high-temperature, high-dust concentration flue gas. The dust in the flue gas is composed of various raw materials for ferromolybdenum smelting, which is expensive and can be used fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B15/04B01D46/02B01D46/42C22B5/04C22C1/02C22C38/12C22C27/04
Inventor 王文宇
Owner LIAONING CHENGUANG ENVIRONMENT ENG TECH
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