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Modified calcium adsorbent for purifying incinerated smoke and preparation process thereof

A calcium-based adsorbent, a technology for incinerating flue gas, applied in chemical instruments and methods, separation methods, other chemical processes, etc., can solve problems such as inappropriateness, and achieve the effects of increased conversion rate, easy operation, and improved adsorption performance

Inactive Publication Date: 2008-11-26
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main purpose of organic additives is to change the water absorption of the surface of powder particles, thereby removing organic pollutants in water. For air pollutants, this modification method is not suitable

Method used

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  • Modified calcium adsorbent for purifying incinerated smoke and preparation process thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Preparation of modified calcium-based adsorbent: add 10% NaCl salt solution to 100g light calcium carbonate, heat to 40°C, soak for 72h, stir constantly, let stand, then heat and calcinate at 900°C 1.5h. Grind through a 100-mesh sieve, seal and pack for use.

[0015] (2) The above-mentioned activated calcium-based adsorbent MCl is used in the treatment of waste incineration flue gas:

[0016] A field experiment of flue gas purification was carried out in a domestic waste incineration plant, and MCl was sprayed into the purification system at a rate of 10g / min.

[0017] Flue gas before purification: HCl concentration is 1625mg / Nm 3 .

[0018] Purified flue gas: HCl concentration is 15mg / Nm 3 .

[0019] The removal rate is: η = 1625 - 15 1625 × 100 % = 99 % .

Embodiment 2

[0021] (1) Preparation of modified calcium-based adsorbent: adding concentration to 100g light calcium carbonate is 15% Na 2 CO 3 Salt solution, heated to 60°C, soaked for 48h, stirred intermittently, stood still, then heated and calcined at 850°C for 2h, ground through a 200-mesh sieve, sealed and packaged for use.

[0022] (2) The above-mentioned activated calcium-based adsorbent MC2 is used in the treatment of waste incineration flue gas:

[0023] A field experiment of tail gas purification was carried out in a medical waste incineration plant, and MC2 was sprayed into the purification system at a rate of 10g / min.

[0024] Flue gas before purification: Hg concentration is 0.050mg / Nm 3 , the concentration of Cd is 1.095mg / Nm 3 , Pb concentration is 76.7mg / Nm 3 .

[0025] Purified flue gas: Hg concentration is 1.05e-4mg / Nm 3 , removal rate is 99.8%; Cd concentration is 2.14e-2mg / Nm 3 , removal rate is 98.0%; Pb concentration is 0.2774mg / Nm 3 , The removal rate is 99.6...

Embodiment 3

[0027] (1) Preparation of modified calcium-based adsorbent: adding concentration to 100g light calcium carbonate is 20% Na 2 S salt solution, heated to 80°C, soaked for 24h, stirred continuously, allowed to stand, and then heated and calcined at 950°C for 1h. Grind through a 200-mesh sieve, seal and pack for use.

[0028] (2) The above-mentioned activated calcium-based adsorbent MC3 is used in the treatment of waste incineration flue gas:

[0029] A field experiment of exhaust gas purification was carried out in a medical waste incineration plant, and MC3 was added to the purification system at a rate of 10g / min.

[0030] Flue gas before purification: the concentration of dioxin pollutants is 25.1ng / Nm 3 .

[0031] Flue gas after purification: the concentration of dioxin-like pollutants is 0.0573ng / Nm 3 , The removal rate is 99.7%.

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Abstract

An modified Ca-base adsorbent for cleaning the fume of garbage incinerator by removing the acidic gas, heavy metal, dioxin, etc from it is prepared from industrial light calcium carbonate (CaCO3) and Na salt as modifier through proportionally immersing the powder of light calcium carbonate in the solution of Na salt, heating while stirring, and calcining.

Description

technical field [0001] The invention belongs to the technical field of waste incineration secondary pollution control, and in particular relates to a calcium-based adsorbent for dry purification of domestic, medical waste and industrial hazardous waste incineration flue gas pollutants and a preparation technology thereof. technical background [0002] According to the material form of adsorbent and reaction product, domestic, medical waste and industrial hazardous waste incineration flue gas purification technology can be divided into three types: wet type, semi-dry type and dry type. The alkaline agent commonly used in wet method is mainly NaOH solution, but caustic soda is more expensive, and the sewage containing heavy metals and other substances produced by wet method needs further treatment. The agent used in the semi-dry method is lime slurry. Although the price is relatively cheap, the pulping system is complicated and the slurry transmission line is prone to failure....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/04B01D53/02
Inventor 王伟卢欢亮
Owner TSINGHUA UNIV
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