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Semi-dry desulfurization method for flue gas of lithium salt plant

A flue gas and desulfurization tower technology, which is applied in the field of semi-dry desulfurization of flue gas in lithium salt plants, can solve problems such as the improvement of desulfurization methods, and achieve the effect of improving stability

Pending Publication Date: 2022-08-09
GUANGDONG J TECH ENVIRONMENT SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The desulfurization equipment mainly focuses on the collection and treatment of sewage in the tower, and does not improve the desulfurization method for the preparation of lithium carbonate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The present embodiment provides a semi-dry desulfurization method for flue gas from a lithium salt factory, the method comprising:

[0035] The flue gas is preheated at a temperature of 140°C and enters the desulfurization tower. The flue gas and the desulfurizer are mixed in the inlet section of the desulfurization tower to obtain mixed flue gas. The calcium-sulfur ratio in the mixed flue gas is 2 ;

[0036] The flue gas volume of the flue gas is 49600Nm3 / h, the initial sulfur content is 500mg / Nm 3 ;

[0037] After the mixed flue gas is accelerated by the Venturi section at the bottom of the desulfurization tower, the flow rate is 4 m / s, and enters the circulating fluidized bed for desulfurization reaction to obtain desulfurized flue gas;

[0038] A spray water device is arranged at the outlet of the venturi section to reduce the temperature of the mixed flue gas to 75°C;

[0039] The superficial pressure drop of the desulfurization tower is 700Pa, and the bed pres...

Embodiment 2

[0042] The present embodiment provides a semi-dry desulfurization method for flue gas from a lithium salt factory, the method comprising:

[0043] The flue gas is preheated at a temperature of 150°C and enters the desulfurization tower. The flue gas and the desulfurizer are mixed in the inlet section of the desulfurization tower to obtain mixed flue gas. The calcium-sulfur ratio in the mixed flue gas is 20 ;

[0044] The flue gas volume of the flue gas is 59000Nm 3 / h, the initial sulfur content is 1700mg / Nm 3 ;

[0045] After the mixed flue gas is accelerated by the Venturi section at the bottom of the desulfurization tower, the flow rate is 6 m / s, and enters the circulating fluidized bed for desulfurization reaction to obtain desulfurized flue gas;

[0046] A spray water device is arranged at the outlet of the venturi section to reduce the temperature of the mixed flue gas to 85°C;

[0047] The superficial pressure drop of the desulfurization tower is 1000Pa, and the bed...

Embodiment 3

[0050] The present embodiment provides a semi-dry desulfurization method for flue gas from a lithium salt factory, the method comprising:

[0051] The temperature of the flue gas is 155°C after preheating and enters the desulfurization tower. The flue gas and the desulfurizer are mixed in the inlet section of the desulfurization tower to obtain mixed flue gas. The calcium-sulfur ratio in the mixed flue gas is 8 ;

[0052] The flue gas volume of the flue gas is 52000Nm 3 / h, the initial sulfur content is 1000mg / Nm 3 ;

[0053] After the mixed flue gas is accelerated by the Venturi section at the bottom of the desulfurization tower, the flow rate is 4.5 m / s, and enters the circulating fluidized bed for desulfurization reaction to obtain desulfurized flue gas;

[0054] A spray water device is arranged at the outlet of the venturi section to reduce the temperature of the mixed flue gas to 77°C;

[0055] The superficial pressure drop of the desulfurization tower is 800Pa, and t...

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PUM

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Abstract

The invention provides a semi-dry desulfurization method for flue gas of a lithium salt factory, which comprises the following steps: preheating the flue gas, feeding the preheated flue gas into a desulfurization tower, and mixing the flue gas with a desulfurizing agent at an inlet section of the desulfurization tower to obtain mixed flue gas; accelerating the mixed flue gas through a venturi section at the bottom of the desulfurization tower, and carrying out desulfurization reaction in a circulating fluidized bed to obtain desulfurized flue gas; the desulfurized flue gas enters the next treatment section after being subjected to dust removal treatment. According to the method, a traditional semi-dry desulfurization method is reasonably improved according to the characteristics of the flue gas of the lithium salt plant, so that the flue gas desulfurization stability of the lithium salt plant is improved, and the sulfur dioxide content of the desulfurized flue gas reaches the national ultra-low emission standard.

Description

technical field [0001] The invention belongs to the field of flue gas treatment, and relates to a semi-dry desulfurization method for flue gas, in particular to a semi-dry desulfurization method for flue gas from a lithium salt factory. Background technique [0002] A lithium salt factory with an annual output of 10,000 tons of battery-grade lithium carbonate and co-production of 10,000 tons of battery-grade lithium hydroxide project kiln tail preheater system and waste gas treatment sub-project of the metallurgical section construction project to remove nitrogen in the flue gas of the roasting material calcination system Oxides and SO 2 , to meet the national emission standards. Existing SO in exhaust emissions 2 Concentration 2000mg / Nm 3 (dry basis, standard state, 8% reference oxygen), NOx concentration 450mg / Nm 3 (Dry basis, standard state, 8% reference oxygen), no exhaust gas purification treatment facilities, it does not meet the national and regional environmental...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/56
CPCB01D53/80B01D53/56B01D2257/302B01D2258/0283Y02P20/129
Inventor 杨森林杨昌良吴斌黄鹏
Owner GUANGDONG J TECH ENVIRONMENT SCI CO LTD