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Device and method for processing cement kiln combustion exhaust gas

A combustion waste gas and treatment device technology, which is applied in the field of cement kiln combustion waste gas treatment devices, can solve problems such as increased emissions of harmful substances, and achieve the effects of suppressing operating costs, equipment costs, and operating costs

Inactive Publication Date: 2008-01-02
TAIHEIYO CEMENT CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the past, although the harmful substances such as alkali, chlorine, sulfur, and heavy metals contained in the combustion exhaust gas of the cement kiln 24 were not much, however, with the increase in the amount of circulating raw materials and fuels processed by cement manufacturing equipment in recent years and the future increase plan, it can The discharge of the above-mentioned harmful substances is expected to increase, so there is concern that it will become a problem in the future

Method used

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  • Device and method for processing cement kiln combustion exhaust gas
  • Device and method for processing cement kiln combustion exhaust gas
  • Device and method for processing cement kiln combustion exhaust gas

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0069] Preparation examples of noble metal-based catalysts are shown below. For example, salts of these noble metals or solutions thereof may be added to the aforementioned titanium / vanadium-based catalyst powder or slurry. Further, at least one noble metal selected from platinum, palladium, rhodium, and ruthenium and / or its compound component can be supported by impregnation, and it is preferable to support by impregnation.

[0070] In the noble metal-based catalyst, the noble metal and / or its compound component contains 0.001% by mass to 5% by mass, more preferably 0.05% by mass to 2.5% by mass of the metal relative to the carrier. If it is less than 0.001% by mass, the decomposition activity of volatile organic compounds will decrease, and if it exceeds 5% by mass, activity commensurate with addition cannot be obtained, so it is not preferable.

[0071]In addition, the above-mentioned oxide-based catalysts and noble metal-based catalysts used in the catalyst device 12 may ...

Embodiment 1

[0091] Next, as the first embodiment of the cement kiln combustion exhaust gas treatment device and treatment method related to the present invention, use the combustion exhaust gas treatment device with the structure shown in Fig. 1, and use titanium vanadium catalyst in the catalyst device 12. The substance removal rate is shown in Table 1. In this test, the combustion exhaust gas temperature at the inlet of the catalyst device 12 was set at 180°C, and the space velocity (SV value) was set at 5060h -1 , In addition, the harmful substance removal rate is calculated using the concentration of each harmful substance at the outlet of the electric precipitator 6 and the concentration of each harmful substance at the outlet of the catalyst device 12 . That is, the ratio of each harmful substance removed by the catalyst device 12 and the like at the outlet of the electrostatic precipitator 6 is shown.

[0092] 〔Table 1〕

[0093] harmful materials

[0094] As shown in T...

Embodiment 2

[0096] Next, as the second embodiment of the cement kiln combustion exhaust gas treatment device and treatment method related to the present invention, the combustion exhaust gas treatment device with the structure shown in Fig. 1 is used, and the catalyst device 12 is provided with a titanium vanadium catalyst ( Table 2 shows each harmful substance removal rate when a platinum catalyst (noble metal catalyst) is installed on the downstream side.

[0097] In this test, it was confirmed that the combustion exhaust gas temperature at the inlet of the catalyst device 12 was set at 180°C, 210°C, and 250°C. In addition, the space velocity (SV value) is 5,060h for the titanium vanadium catalyst -1 , platinum catalyst for 24,200h -1 . Reducing agent (NH 3 Gas) is sprayed on the upstream side of the catalyst device, and NOx and NH 3 The molar ratio is set to 1. Furthermore, the harmful substance removal rate is to use the concentration of each harmful substance at the outlet of th...

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Abstract

To while keeping facility cost and operating cost low, efficiently remove from a cement kiln firing waste gas any hazardous substances, such as dust, NOx, residual organic pollutants, volatile organic compounds, CO and odorous substances. [MEANS FOR SOLVING PROBLEMS] There is provided firing waste gas treating apparatus (1) comprising dust collection unit (6) for collecting of dust from cement kiln firing waste gas (G1), wet dust collector (7) as a catalyst poisoned substance removing unit for removing of catalyst poisoned substances from firing waste gas (G2) having passed through the dust collection unit (6), preheating units (10,11) for preheating of firing waste gas (G3) having passed through the wet dust collector (7), and catalyst unit (12) for removing of NOx, residual organic pollutants, etc. from the preheated firing waste gas. A titanium / vanadium catalyst or the like as oxide catalyst is used in the upstream side of the catalyst unit (12), while a platinum catalyst or the like as noble metal catalyst is used in the downstream side thereof. The firing waste gas after removing of catalyst poisoned substances is heated to = 140 DEG C by means of the preheating units, thereby preventing any drop of the efficiency of denitration and volatile organic compound decomposition.

Description

【Technical field】 [0001] The invention relates to a cement kiln combustion exhaust gas treatment device and treatment method for removing dust, NOx, dioxin and other residual organic pollutants, volatile organic compounds and CO and other harmful substances in the combustion exhaust gas of a cement kiln. 【Background technique】 [0002] As shown in FIG. 2, the cement burning equipment 21 is composed of a preheater 22, a calciner 23, a cement kiln 24, and a clinker cooler 25. The cement raw material R input into the preheater 22 from the raw material supply system is It is preheated in the preheater 22 , calcined in the calciner 23 , fired in the cement kiln 24 , and the produced clinker C1 is cooled in the clinker cooler 25 . Here, the treatment of the combustion exhaust gas from the cement kiln 24 is carried out by desulfurization in the preheater 22 and dust recovery by the electric dust collector 26 because the limestone as the main raw material has the property of adsorbi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/60B01D53/86
CPCF27D17/008B01D2255/20707B01D53/86B01D2255/20723B01D53/864B01D2255/10F27B7/2033C04B7/436B01D53/8625B01D53/8668Y02A50/20C04B7/364C04B7/60
Inventor 斋藤绅一郎内山康广寺崎淳一近藤尚萩光晴正木信之
Owner TAIHEIYO CEMENT CORP
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