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Pulverulent lime composition, method for the production thereof, and use of the same

A composition, powdered technology, applied in the field of powdered slaked lime composition, to achieve the effect of excellent performance, good ability, and improved capture performance

Inactive Publication Date: 2009-02-18
LHOIST RECH & DEV SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, this second generation lime does not have such a large increase in capture performance as described above for all acid gases that may be present in the flue gas

Method used

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  • Pulverulent lime composition, method for the production thereof, and use of the same
  • Pulverulent lime composition, method for the production thereof, and use of the same
  • Pulverulent lime composition, method for the production thereof, and use of the same

Examples

Experimental program
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Effect test

Embodiment 1

[0071] Industrially produced slaked lime was chosen as the reference powder compound (conventional or standard lime). Its BET specific surface area is 18m 2 / g and its BJH total pore volume is 0.08cm 3 / g.

[0072]As in all cases shown here, the BET specific surface area was determined by nitrogen adsorption at 77 K according to the well-known BET method, using previously vacuum-degassed samples, using a Micromeritics ASAP 2010 type apparatus. The total pore volume was determined by nitrogen desorption at 77K on the same equipment and interpreted according to the BJH method (assumption of cylindrical geometry of the pores).

[0073] In addition, the two types of slaked lime of the first generation were figure 1 Produced in the pilot plant of ® from quicklime similar to the quicklime used to produce the reference slaked lime above and following the same process but with additives. For the first generation the additive is NaOH, for the second generation it is Na 2 CO 3 , i...

Embodiment 2

[0088] Following a method similar to that described in document WO97 / 14650, in figure 1 The second generation of slaked lime was produced in the pilot plant, that is, quicklime was digested in the presence of a large excess of water (residual moisture before drying was 200-300 g / kg), after which the excess water of the final product was dried.

[0089] Furthermore, the five slaked limes according to the invention were produced in the same equipment from quicklime similar to that used for the production of the second generation slaked lime described above, using a similar method but with additives. Additives are NaOH, Na 2 CO 3 、Na 3 PO 4 , NaCOOH (sodium formate) and NaNO 3 , added in such an amount that the final product contains approximately 7 g sodium / kg absorbent.

[0090] The desulfurization performance of the six slaked limes of Example 2 was evaluated under the same operating conditions in the same manner as in Example 1, except that the stoichiometric factor was ...

Embodiment 3

[0099] The HCl reduction performance of the six slaked limes of Example 2 was evaluated in the test rig of Figure 2 under the same operating conditions of Example 2, except that the composition of the gas to be purified contained 1200 mg / Nm 3 HCl, and no SO 2 .

[0100] The BET specific surface area and BJH total pore volume of the six kinds of limes in Example 2 are summarized in Table 3 as well as their performance in reducing HCl in the device of FIG. 2 under the above conditions.

[0101] Table 3: BET specific surface area, BJH pore volume and HCl reduction rate

[0102]

[0103] The result of table 3 shows: with respect to the second generation product of reference, HCl reduction rate is not subjected to or is seldom subjected to the impact of the present invention's treatment.

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Abstract

The invention relates to a pulverulent lime composition comprising an alkali metal and having a specific surface BET which is equal to or larger than 25 m<2> / g and a total porous volume BJH of nitrogen desorption which is equal to or higher than 0.1 cm<3> / g. The invention also relates to a method for producing said composition, and to the use of the same for reducing the quantity of exhaust gas produced.

Description

technical field [0001] The present invention relates to a powdered slaked lime composition, a method for its production and the use of a powdered lime composition for reducing sulfur-containing and halogenated compounds in flue gases. Background technique [0002] Slaked lime (chaux hydratée), also known as powdered slaked lime (chaux éteinte), is mainly composed of calcium hydroxide Ca(OH) 2 The whole body of solid particles. [0003] This slaked lime may of course contain impurities such as oxides or hydroxides of magnesium, silicon dioxide, aluminum oxide, etc., in amounts of several tens of g / kg. Typically, the particle size of such powdery substances is generally less than 1 mm and generally less than 250 μm. Slaked lime may contain free water, ie not chemically bound to compounds, in an amount of up to about 50 g / kg. [0004] Powdered slaked lime is used in numerous applications, especially as acidic compounds (HCl, SO 2 , HF, SO 3 ...) neutralizer. In this simpl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/02B01D53/50C04B2/06B01D53/68B01J20/04
CPCB01J20/04B01J20/048B01J20/045B01J20/043B01J20/28071B01D2251/604C01P2004/61C04B2/06B01J20/28059C01P2006/12C01F11/02C01P2006/14B01J20/046B01D2251/404B01J20/041C01P2006/80B01D53/50B01D53/685B01D53/81B01D2251/304B01D2258/0283B01D2257/2045B01D2257/2042B01D2257/2047B01J20/3085B01D53/68
Inventor A·洛代A·甘宾
Owner LHOIST RECH & DEV SA
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