Dry flue gas desulphurization method using steel slag or blast furnace slag as absorbing agent

A dry flue gas desulfurization and blast furnace slag technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve problems such as equipment corrosion, achieve small footprint, high system reliability, and save system occupation. earth effect

Inactive Publication Date: 2010-08-11
周建安
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And its desulfurization absorption tower is in an acidic working environm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A boiler flue gas volume of 10000Nm 3 / h, sulfur dioxide content 800mg / Nm 3 , flue gas temperature 140 ℃. The flue gas desulfurization process of the present invention is used for desulfurization treatment, and the flue gas temperature at the outlet of the desulfurization tower is ≥70°C. Main chemical composition (mass ratio) of blast furnace slag: CaO (38.2%), SiO 2 (35.7%), Al 2 o 3 (16.3%), MgO (8.3%), S (1.01%).

[0028] The relevant operating parameters of this embodiment are as follows:

[0029] Process water consumption 320kg / h

[0030] Circular ash return 50kg / h

[0031] After treatment, the sulfur dioxide content is 120mg / Nm 3 , the desulfurization rate is 85%.

[0032] The specific process is as follows.

[0033] Select blast furnace slag with a particle size of ≤0.048mm, and spray the blast furnace slag into the desulfurization tower through the absorbent injection port by means of pneumatic conveying.

[0034] The clean process water is sprayed in...

Embodiment 2

[0040] A boiler flue gas volume of 110000Nm 3 / h, sulfur dioxide content 850mg / Nm 3, flue gas temperature 150 ℃. The flue gas desulfurization process of the present invention is used for desulfurization treatment, and the flue gas temperature at the outlet of the desulfurization tower is ≥70°C. Main chemical composition (mass ratio) of steel slag: CaO (54.92%), MgO (5.42%), total Fe (12.78%), S (1.62%).

[0041] The relevant operating parameters of this embodiment are as follows:

[0042] Process water consumption 3300kg / h

[0043] Circular ash return rate 600kg / h

[0044] After treatment, the sulfur dioxide content is 75mg / Nm 3 , the desulfurization rate is 91%.

[0045] The specific process is as follows.

[0046] Steel slag with particle size ≤0.048mm is selected, and the steel slag is sprayed into the desulfurization tower through the absorbent injection port by pneumatic conveying method.

[0047] The clean process water is sprayed into the desulfurization tower t...

Embodiment 3

[0053] A sintering flue gas volume of 200000Nm 3 / h, sulfur dioxide content 800mg / Nm 3 , flue gas temperature 110 ℃. The flue gas desulfurization process of the present invention is used for desulfurization treatment, and the flue gas temperature at the outlet of the desulfurization tower is ≥70°C. Main chemical composition (mass ratio) of steel slag: CaO (45.54%), MgO (9.42%), total Fe (11.43%), S (1.55%).

[0054] The relevant operating parameters of this embodiment are as follows:

[0055] Process water consumption 6100kg / h

[0056] Circular ash return 1000kg / h

[0057] After treatment, the sulfur dioxide content is 65mg / Nm 3 , the desulfurization rate is 92%.

[0058] The specific process is as follows.

[0059] Steel slag with particle size ≤0.048mm is selected, and the steel slag is sprayed into the desulfurization tower through the absorbent injection port by pneumatic conveying method.

[0060] The clean process water is sprayed into the desulfurization tower t...

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Abstract

The invention relates to a dry flue gas desulphurization method using steel slag or blast furnace slag as absorbing agents, which comprises the following steps: adopting a nitrification circulation fluidized bed flue gas desulphurization device; selecting the steel slag or the blast furnace slag with the granularity smaller than or equal to 0.048 mm to be sprayed into a desulphurization tower by a pneumatic conveying method; spraying process water into the desulphurization tower through an atomization water spraying nozzle; introducing the flue gas into the desulphurization tower from a flue gas inlet of a pre-dust-removal section; making the desulphurized flue gas enter a secondary dust remover; spraying circulation dust into the desulphurization tower by the pneumatic conveying method; discharging the dust into an external transportation dust field from an external dust discharge outlet; and discharging the clean flue gas into a chimney through a draught fan to be discharged into the atmosphere. The invention adopts the steel slag or the blast furnace slag as the absorbing agents, the desulphurization cost is low, the nitrification circulation fluidized bed flue gas desulphurization device is adopted, ground occupied by the system can be saved, the equipment investment can be reduced, and in addition, the desulphurization effect is good.

Description

technical field [0001] The invention belongs to the technical field of flue gas treatment, and in particular relates to flue gas desulfurization technology. Background technique [0002] Steel slag and blast furnace slag are solid wastes discharged from the steel production process. Due to the differences in technology, raw materials, and furnace types used by various enterprises, the composition of the steel slag produced by them is also different. Generally speaking, the chemical composition of steel slag is mainly oxides of calcium, magnesium, silicon, iron, etc., and its mineral phase is mainly tricalcium silicate, dicalcium silicate, etc., and the total amount is more than 50%. The chemical composition of blast furnace slag is mainly oxides of calcium, magnesium, aluminum, silicon, etc., and its mineral phases are mainly calcium-aluminum feldspar, calcium-magnesium feldspar, etc. The content of CaO in blast furnace slag and steel slag is about 40% to 50%, but SiO in b...

Claims

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Application Information

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IPC IPC(8): B01D53/50B01D53/83
Inventor 周建安党君祥李旭
Owner 周建安
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