Light-calcined magnesia calcining furnace desulfurization technique and system

A technology for lightly burning magnesia and desulfurization process is applied in the field of desulfurization process and its system, which can solve the problems of high price, low profit, secondary pollution and the like

Inactive Publication Date: 2013-12-18
新疆蓝天镁业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low profit of the industry, the high price of desulfurization, and the secondary pollution after desulfurization, most enterprises do not have desulfurization devices that can operate

Method used

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  • Light-calcined magnesia calcining furnace desulfurization technique and system
  • Light-calcined magnesia calcining furnace desulfurization technique and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In the light calcined powder calciner 1 with coal gas as the heat source, 50~120 mm massive magnesite (its composition includes: MgCO 3 82.38%, CaCO 3 8.81%, which is lower-grade magnesite) from the top of the furnace, and the high-temperature calcination temperature is 950-1100°C to obtain highly active light-burned powder. The exhaust gas content (volume content %) is: N 2 , 58.9%; CO 2 , 31.8%; O 2 , 1%; SO 2 , 0.2%; Ar, 495ppm; H 2 O, 8.2%. The output of the calciner is 3333 kg / h, of which the desulfurization requires lightly burned powder per hour is 50 kg / h, the solid content of the slurry is 25%, and the amount of slurry is 200 kg / h. SO in flue gas after flue gas desulfurization 2 The flow rate is 45ppm, the desulfurization liquid circulation volume is 30 m3 / h, 45°C, the flue gas temperature rises to 61°C after desulfurization, and about 3% of the water turns into steam. After recycling, the content of magnesium sulfate reaches 250 g / L, and the content o...

Embodiment 2

[0025] A system for realizing the desulfurization process of the above-mentioned light-burned magnesia calciner, the system includes 1. light-burned powder calciner; 2. desulfurization tower; 3. tail gas fan; 4. fin heat exchanger; 5. axial flow Fan; 6, axial flow fan; 7, circulation tank; 8, circulation pump; 9, slurry tank; 10, slurry pump, and the light calcined powder calciner 1 is connected to the bottom entrance of the desulfurization tower 2, desulfurization The gas outlet of the tower is connected to the inlet of the tail gas fan, the liquid outlet of the desulfurization tower 2 is connected to the inlet of the fin heat exchanger 4, the outlet of the fin heat exchanger 4 is connected to the top of the circulation tank, and the axial fans 5 and 6 cool the fins for heat exchange device, the outlet of the pulping tank 9 is connected to the inlet of the pulping pump 10, and the inlet of the pulping pump is connected to the inlet of the circulation tank.

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Abstract

The invention provides a light-calcined magnesia calcining furnace desulfurization technique and system. The technique comprises steps as follows: light-calcined magnesia and water are added into a slurrying tank for slurrying, and the slurry enters a recycling tank; the slurry in the recycling tank is pumped to the top of a desulfurizing tower by a recycle pump and performs reflux absorption with fume which enters the bottom; the absorbed fume is discharged to air by a subsequent exhaust blower; the liquid on the bottom of the desulfurizing tower returns into a finned heat exchanger to be naturally cooled by an axial fan; the desulfurized solution enters the recycling tank; an air blower is additionally arranged in the recycling tank, and magnesium sulfite in the oxidizing solution also performs the function of further cooling; and when the solution concentration reaches 250 g/L, the solution is pumped to a magnesium cement construction material system to be used as a magnesium cement raw material. Only an ammonium chloride recycling process exists in the whole technical process, and thus, the technique is environment-friendly and clean.

Description

technical field [0001] The invention relates to a desulfurization process and system in the process of producing light-burned magnesia by using magnesite, belonging to the field of comprehensive utilization of non-metallic resources. Background technique [0002] At present, the equipment for producing light-calcined magnesia by calcining magnesite mainly includes calcining shaft kilns and rotary kilns, but in actual production, calcining shaft kilns are mainly used. In places such as Haicheng and Dashiqiao, Liaoning, my country, there are Hundreds of calcination shaft kilns, with the same equipment structure, all adopt direct-fired shaft kilns using hot dirty gas as fuel. The process includes: magnesite is pretreated to remove miscellaneous ores, washed soil, etc., and crushed into 100-250mm The blocks are lifted to the top of the shaft kiln by the hoisting device, fed into the material bell, and fed into the kiln through the material bell. Air and water vapor are introduced...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50
Inventor 王云山沈克兵惠迎花
Owner 新疆蓝天镁业股份有限公司
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