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Process for cleaning flue gases by utilizing alkali resources in slag

A technology for flue gas and slag, which is applied in the separation of dispersed particles, chemical instruments and methods, separation methods, etc., can solve the problems of increasing the cost of heat treatment of waste, save water resources and treatment costs, improve economic benefits, and reduce treatment costs. cost effect

Inactive Publication Date: 2015-03-18
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The three heat treatment methods have their own advantages and disadvantages, but no matter which method will produce flue gas containing a variety of toxic and harmful components, such as SOx, COx, NOx, HCl, HBr, heavy metals, and traces of chlorinated organic compounds, etc.
However, adding man-made chemicals will undoubtedly increase the cost of thermal treatment of waste, and at the same time create new sources of pollution

Method used

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  • Process for cleaning flue gases by utilizing alkali resources in slag

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A domestic waste incineration device has a capacity of 200t / d, and the average mass of solid residue discharged per ton of domestic waste is 155Kg / d, and the flue gas produced after ton of waste incineration is about 2980Nm 3 , in volume fraction, the flue gas contains CO 2 5%, SO 2 266mg / m 3 ; NOx (in NO 2 In terms of) 800mg / m 3 ;HCl is 196mg / m 3 ;HF is 56mg / m 3 , the flue gas temperature is 920°C.

[0027]With the process of the present invention, the high-temperature flue gas enters the heat utilization system E1 through the high-temperature flue gas conveying pipe 3 to generate high-pressure water vapor, which is used for power generation and heating and cooling of the factory area. After heat utilization, the temperature of the flue gas drops to 118°C, and passes through the low-temperature flue gas pipeline 4 into the bottom of No. 1 reaction absorption tower T1. The temperature of the slag at the bottom of the domestic waste incinerator F1 is 905°C. It is ...

Embodiment 2

[0030] A pyrolysis-gasification combustion facility with a processing capacity of 300t / d domestic waste in a certain place, the average solid slag discharged from the pyrolysis gasifier per ton of domestic waste is 148Kg, and the gas combustion system produces 2890Nm of flue gas 3 , the flue gas contains CO 2 6.2%, SO 2 221mg / m 3 ; NOx (in NO 2 In terms of) 780mg / m 3 ; HCl is 202mg / m 3 ;HF is 35mg / m 3 , the flue gas temperature is 1048°C. The pH of the cooled and prepared alkaline solution in S2 is 8.2. The operating pressure of No. 1 reaction absorption tower T1 is 0.14MPa, the operating temperature is 16°C, and the liquid phase spray density is 28m 3 / (m 2 h). The operating pressure of No. 2 reaction absorption tower T2 is 0.135MPa, the operating temperature is 25°C, and the liquid phase spray density is 30m 3 / (m 2 h). The method of operation is the same as in Example 1.

[0031] After passing the above steps, the content of various acidic substances in the flue...

Embodiment 3

[0033] A pyrolysis-gasification combustion facility with a processing capacity of 120t / d domestic waste in a certain place, the average solid slag discharged from the pyrolysis gasifier per ton of domestic waste is 163Kg, and the gas combustion system produces 3108Nm of flue gas 3 , the flue gas contains CO 2 5.3%, SO 2 198mg / m 3 ; NOx (in NO 2 In terms of) 669mg / m 3 ; HCl is 254mg / m 3 ; HF is 67mg / m 3 , the flue gas temperature is 1032°C. The pH of the cooled and prepared alkali solution in S2 is 9.0. The operating pressure of No. 1 reaction absorption tower T1 is 0.125MPa, the operating temperature is 11°C, and the liquid phase spray density is 22m 3 / (m 2 h). The operating pressure of No. 2 reaction absorption tower T2 is 0.12MPa, the operating temperature is 28°C, and the liquid phase spray density is 27m 3 / (m 2 h). Operation method is the same with embodiment 1,2.

[0034] After passing the above steps, the content of various acidic substances in the flue gas...

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Abstract

The invention discloses a process for cleaning flue gases by utilizing alkali resources in solid slag. The process consists of operations of a high-temperature flue gas heat utilization system, an alkali resource extraction system and a flue gas purification system. The temperature of flue gases generated by performing high-temperature incineration and pyrolysis gasification combustion on household garbage is generally 800-1,100 DEG C, the high-temperature flue gas is introduced into a heat utilization system E1 to generate high-pressure water vapor (for power generation or directly used by a downstream user), the flue gas is cooled to enter the flue gas purification system, namely a No.1 reaction absorption tower T1 and a No.2 reaction absorption tower T2, a technical spraying solution prepared from a mixed alkali solution obtained by extracting reclaimed water from the high-temperature slag is in countercurrent contact with the flue gas, acid gases in the flue gas are subjected to reaction absorption, and the flue gas is washed, so that the flue gas is purified. The indexes of the purified flue gas are superior to national and international emission standards.

Description

technical field [0001] The invention relates to the utilization of alkali resources of domestic garbage pyrolysis furnace solid slag and the technology of flue gas purification. Background technique [0002] In recent years, with the economic development of various countries and the acceleration of urbanization, the total amount of domestic waste has also shown a rapid growth trend, and the harmless disposal of waste has increasingly become an environmental problem faced by various cities. Taking my country as an example, according to the statistics of relevant state departments, in 2006, the total amount of urban domestic waste in my country has reached 140 million tons, and it has increased year by year with an annual growth rate of 8% to 10%. The annual growth rate of a few cities such as Beijing has reached 15% to 20%, far exceeding the world average growth rate. [0003] Technically speaking, thermal treatment of municipal solid waste is the most effective way to solve ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/75B01D53/78B01D53/60B01D53/68B01D53/62
Inventor 张志炳韩旭王宝荣周政张锋
Owner NANJING UNIV