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Catalyst for desulfurizing and denitrating at the same time and its application method

A technology for desulfurization and denitrification and application method, which is applied to simultaneous desulfurization and denitrification catalysts and application fields, can solve the problems of restricting industrial applications, clogging reactors, large power consumption, etc., achieves easy mass production on a large scale, overcomes low activity and pressure reduced effect

Inactive Publication Date: 2004-02-18
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the former is not suitable for large-scale application due to high power consumption and high operating costs; activated carbon is only suitable for low space velocity 1000h due to its low activity. -1 The following runs; CuO / Al 2 o 3 The operating temperature of the catalyst is 300-400°C, which is much higher than the flue gas exhaust temperature of most boilers in my country, and it is difficult to match with existing industrial boilers
In addition, most of the existing catalysts are granular, which can easily cause the accumulation of dust in the flue gas, block the reactor, and limit its practical industrial application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Honeycomb activated carbon was activated with water vapor at 800°C for 60 minutes, then cut into small cylindrical pieces with a diameter of 19 mm and a height of 48 mm, and impregnated with a mixed solution of ammonium metavanadate and oxalic acid (ammonium metavanadate The concentration is 0.043g / ml), dried at 110°C, and then sequentially calcined in an inert atmosphere and oxidized in air to prepare the catalyst, wherein V 2 o 5 The loading is 2%.

[0017] The catalyst is placed on the support frame in the middle of the fixed bed reactor, and the temperature is raised to 200°C for ventilation. The composition of the simulated flue gas is: 1370ppm SO 2 , 390ppm NO, 430ppm NH 3 , 3vol%H 2 O, 3.9vol%O 2 , Ar is the balance gas, and the space velocity is 1900h -1 . The experimental result is: the sulfur capacity of the catalyst is 45.2mgSO 2 / 100g catalyst (in SO 2 When the conversion rate reaches 80%, the NO conversion rate at this time is 82%.

Embodiment 2

[0019] The honeycomb activated carbon was activated with water vapor at 850°C for 60 minutes, and then cut into small cylindrical pieces with a diameter of 19mm and a height of 50mm. The concentration is 0.043g / ml), dried at 110°C, and then sequentially calcined in an inert atmosphere and oxidized in air to prepare the catalyst, wherein V 2 o 5 The loading is 2%.

[0020] The catalyst is placed on the support frame in the middle of the fixed bed reactor, and the temperature is raised to 200°C for ventilation. The composition of the simulated flue gas is: 1370ppm SO 2 , 390ppm NO, 430ppm NH 3 , 3vol%H 2 O, 3.9vol%O 2 , Ar is the balance gas, and the space velocity is 1820h -1 . The experimental result is: the sulfur capacity of the catalyst is 47.3mgSO 2 / 100g catalyst (in SO 2 When the conversion rate reaches 80%, the NO conversion rate at this time is 82%.

Embodiment 3

[0022] Honeycomb activated carbon was activated with water vapor at 900°C for 60 minutes, then cut into small cylindrical pieces with a diameter of 19 mm and a height of 49 mm, and impregnated with a mixed solution of ammonium metavanadate and oxalic acid (ammonium metavanadate The concentration is 0.043g / ml), dried at 110°C, and then sequentially calcined in an inert atmosphere and oxidized in air to prepare the catalyst, wherein V 2 o 5 The loading is 2%.

[0023] The catalyst is placed on the support frame in the middle of the fixed bed reactor, and the temperature is raised to 200°C for ventilation. The composition of the simulated flue gas is: 1370ppm SO 2 , 390ppm NO, 430ppm NH 3 , 3vol%H 2 O, 3.9vol%O 2 , Ar is the balance gas, and the space velocity is 1850h -1 . The experimental result is: the sulfur capacity of the catalyst is 46.8mgSO 2 / 100g catalyst (in SO 2 When the conversion rate reaches 80%, the NO conversion rate at this time is 79%.

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Abstract

A desulfurizing-denitrating catalyst contains cellular activated carbon (90-99.9 wt.%) and V2O5. It is applied through putting it on supporter in fixed-bed reactor and reacting on fume at 150-250 deg.C and 500-5000 / hr of space speed. Its advantage is high transform rate of 80% for SO2 and 50-100% for NO.

Description

Technical field: [0001] The invention belongs to a catalyst and its application method, in particular to a honeycomb activated carbon catalyst capable of simultaneous desulfurization and denitrification at low temperature and its application method Background technique: [0002] SO contained in coal combustion flue gas 2 and NO x The emission of acid rain and acid mist is the main reason for the formation of acid rain and acid fog, which has caused great harm to the ecological environment and human health on which human beings depend. Therefore, it is imperative to effectively eliminate the hidden dangers of the two. [0003] The flue gas desulfurization (FGD) and selective catalytic reduction (SCR) technologies currently used in industry are mostly two independent processes. Among them, coal-fired flue gas desulfurization (FGD) is currently the 2 The commonly used methods of discharge are mainly wet and dry methods. Among them, the wet desulfurization process is relative...

Claims

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Application Information

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IPC IPC(8): B01D53/60B01D53/86B01J23/22
Inventor 刘振宇王艳莉刘清雅
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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