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Smoke desulfuration denitrification dedust process and device

A flue gas and process technology, which is applied in the field of industrial furnace flue gas desulfurization, denitrification and dust removal process and equipment, can solve the problems of complicated process, ineffective utilization, and expensive equipment investment, and achieve simple process flow, low power consumption, and low cost effect

Inactive Publication Date: 2006-01-11
重庆正和生物能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process is complicated, the equipment is huge, the device investment is expensive, and the operating cost is high.
[0005] In the spray drying-dry desulfurization technology, lime milk is used as desulfurization agent to absorb SO in the flue gas in the spray drying tower. 2 by-product CaSO 4 (Gypsum) method also has complex process and huge equipment, and its by-product gypsum has low value and cannot be effectively utilized, and most of it is discarded to cause secondary pollution

Method used

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  • Smoke desulfuration denitrification dedust process and device
  • Smoke desulfuration denitrification dedust process and device
  • Smoke desulfuration denitrification dedust process and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Tested on DZL4-1.25-AIII type boiler; SO in flue gas 2 The content is 1760mg / M 3 , close the air intake door of the combustion section to make the coal burn in an oxygen-poor state, test the oxygen content in the flue gas with a flue gas comprehensive tester, make the excess air coefficient α = 0.7, and open the air door of the ember section to fully burn the coal As far as possible, measure the oxygen content in the flue gas, so that the excess air coefficient α = 1.2, and there is no black carbon in the slag. An air inlet is opened at the upper part of the combustion section 600mm above the grate, and the secondary air is sent in. The secondary air volume is 25% of the total air volume, forming a wind on the fire, so that the unburned volatiles are burned out; at the outlet of the furnace flue gas , the temperature of the flue gas is introduced into a nozzle in the area of ​​900 ° C, and a small amount of ammonia water is injected, and the NO X The molar ratio of am...

Embodiment 2

[0082] DZL4-1.25-AIII type boiler is used, when using Class III bituminous coal, under rated working conditions, SO in the flue gas 2 The content is 2840mg / M 3 , using the process of Example 1, the treated flue gas SO 2 The content is 70mg / M 3 . NO X The content is 170mg / M 3 , soot content is 35mg / M 3 (testing with flue gas composition tester) per hour ammonium sulfate output is 68.5kg, and ammonium sulfate water content and purity are with embodiment 1.

Embodiment 3

[0084] Still testing on the DZL4-1.25-AIII type boiler, when using Type III bituminous coal, under rated conditions, the SO in the flue gas 2 The content is 3410mg / M 3 The coal-fired, technological process is the same as embodiment 1, and the flue gas SO after treatment 2 The content is 80mg / M 3 ; The output of ammonium sulfate per hour is 82.5kg, NO X The content is 160mg / M 3 , soot content is 48mg / M 3 .

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Abstract

A process for desulfurizing, denitrifying and dusting the fume includes such steps as regulating the air supply of industrial furnace to decrease the generation of NOx, reversely spraying ammonia into combustion box, introducing oxygen to back smoke chamber, removing dust, reaction in centrifugally spraying drying tower to generate ammonium sulfate, separating, and washing in supergravitational washer. Its apparatus is composed of cyclone duster, draught fan, centrifugal spraying drying tower, oxygen generator, supergravitational washer and cyclone separator. Its advantages are high effect, low cost and no secondary pollution.

Description

Technical field: [0001] The invention relates to a process and device for desulfurization, denitrification and dust removal of industrial furnace flue gas, and can also be used for desulfurization, denitrification and dust removal of other flue gases. Background technique: [0002] my country is the world's largest coal producer and consumer, and emits SO into the atmosphere every year. 2 There are 24 million tons, NO X There are 7 million tons, and a lot of soot. lots of SO 2 and NO X Pollution and the resulting acid precipitation pollution have caused serious harm to human health, agriculture, forests, fisheries, materials, etc. For this reason, the country has invested huge manpower and financial resources, but it still cannot be effectively treated; it costs a lot of money More than 20 sets of large-scale power plant flue gas treatment technologies have been introduced from abroad, but all of them cannot be popularized because of the huge investment, high operating c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/50B01D53/78F23D1/00
Inventor 段可桐
Owner 重庆正和生物能源有限公司
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