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Removing and recovering process and device for SO2 in flue gas

A recovery method, SO2 technology, applied in chemical instruments and methods, separation methods, ammonium sulfate, etc., to achieve the effects of convenient operation, reduced steam consumption, and high desulfurization efficiency

Inactive Publication Date: 2003-04-09
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] The technical problem to be solved in the present invention is to disclose a kind of SO 2 Ejection and recovery method and device, to overcome the defects in the prior art

Method used

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  • Removing and recovering process and device for SO2 in flue gas
  • Removing and recovering process and device for SO2 in flue gas
  • Removing and recovering process and device for SO2 in flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] A 220T / h coal-fired thermoelectric boiler with a flue gas flow rate of 250,000 Nm 3 / hr, SO 2 The content is 1500mg / Nm 3 , the dust content of flue gas is 80mg / Nm 3 , the flue gas temperature is 140°C. The desulfurization tower 6 has a diameter of 6m and a height of 28m. The reheater 2 is a heat pipe type. After the flue gas passes through the reheater 2, the temperature drops to 110°C and enters the desulfurization tower 6. When leaving the desulfurization tower, the SO in the desulfurization tail gas 2 The content is 20mg / Nm 3 , NH 3 The content is 1mg / Nm 3 , the water foam content is 96mg / Nm 3 .

[0078] The absorption section adopts 100m 2 / m 3 The polypropylene structured orifice corrugated packing, the absorption liquid flow rate is 100m 3 / hr, the ammonium sulfite content is 7.5% (wt), and when leaving the absorption section, the ammonium sulfite concentration is 0.6% (wt).

[0079] In the absorption section, the amount of ammonia intake is 1.45 acco...

Embodiment 2

[0082] A 670T / h thermal power generation unit, namely 200MW, burns coal with a sulfur content between 1.5-2.0%, and the flue gas flow rate is 800,000 Nm 3 / hr, SO 2 The content is 4200mg / Nm 3 , the electrostatic precipitator is 3 electric fields, and the dust content of the flue gas is 200mg / Nm 3 , the flue gas temperature is 145°C. The desulfurization tower 6 has a diameter of 10 m and a height of 30 m.

[0083] The reheater 2 is a rotary heat storage type. After the flue gas passes through the reheater, the temperature drops to 116°C and enters the desulfurization tower. When leaving the desulfurization tower, the SO in the desulfurization tail gas 2 The content is 34mg / Nm 3 , NH 3 The content is 1mg / Nm 3 , the water foam content is 125mg / Nm 3 .

[0084] The absorption section adopts 125m 2 / m 3 The polypropylene structured orifice corrugated packing, the absorption liquid flow rate is 400m 3 / hr, the ammonium sulfite content is 17.3% (wt), and when leaving the ...

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Abstract

The recovering process includes the steps of: the reaction of the S containing fume with water solution of ammonia, with ammonia-to-sulphur molar ratio of 1.3-1.8 and gas-to-liquid ratio of 2000-5000, to produce ammonium sulfite solution; the oxidation of ammonium sulfite solution with air to obtain ammonium sulfate solution; the contact of the ammonium sulfate solution with hot fume to evaporatewater and the crystallization of ammonium sulfate in a crystallizer to produce commercial ammonium sulfate fertilizer. The equipment includes one desulfurizing tower with SO2 absorbing section, one ammonium sulfite oxidizing section, ammonium sulfate solution concentration section, one water washing section and mist elimianting section. The present invention can lower cost and steam consumption, reduce fume density and produce ammonium sulfate fertilizer.

Description

technical field [0001] The invention relates to a kind of SO in flue gas 2 A method and device for removing and recovering, in particular to a flue gas desulfurization method using ammonia as a raw material (including liquid ammonia, ammonia water and ammonium bicarbonate). Background technique [0002] When sulfur-containing minerals and fuels are burned, the flue gas emitted contains SO 2 . SO in flue gas 2 The content is usually low, between 300-5000ppmv (1000-15000 mg / standard cubic meter), but the amount of smoke is very large. In terms of coal-fired boilers, the steam scale ranges from 1T / h to 2500T / h, the generating set capacity ranges from 6MW to 900MW, and the flue gas volume ranges from 10,000 Nm 3 / h to 2.5 million Nm 3 / h, has produced serious acid rain and SO 2 pollute. Therefore, flue gas desulfurization and SO 2 The recovery of waste has been widely paid attention to. [0003] The principle of flue gas desulfurization is alkaline desulfurizer and acid...

Claims

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Application Information

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IPC IPC(8): B01D53/50B01D53/73C01C1/24
CPCB01D53/73C01C1/24B01D53/501
Inventor 肖文德
Owner EAST CHINA UNIV OF SCI & TECH
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