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Heat pipe type SCR denitration reactor and low-temperature sulfur-containing flue gas denitration method thereof

A technology of denitrification reactor and heat pipe type, which is applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of easy deactivation of catalysts and low efficiency of SCR denitrification, and achieve good axial uniformity and good reactor layout. Flexible, fast heat transfer effect

Pending Publication Date: 2022-02-25
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a heat pipe type SCR denitrification reactor with a long service life of the catalyst and convenient continuous regeneration in situ, so as to solve the problem of low SCR denitrification efficiency of low-temperature flue gas from industrial furnaces and kilns in the prior art. Vulnerable technical issues

Method used

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  • Heat pipe type SCR denitration reactor and low-temperature sulfur-containing flue gas denitration method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The structure of the heat pipe type SCR denitrifact reactor of the present embodiment is figure 1As shown, the heat pipe type SCR denitrifact reactor of the present embodiment includes a reactor body, and a reactor body is provided with a flue 1, and the reactor is located below the flue 1, a heat source medium passage 2, a smoke The road 1 and the heat source dielectric channel 2 average extension, the flue 2 and the heat source dielectric channel 2 are provided with a heat insulating layer 3, and the heat insulating layer 3 is between the lower wall surface of the flue 1 and the upper wall surface of the heat source medium passage 2. The heat insulating material is configured, and the heat pipe array is vertically disposed in the reactor. The heat pipe array contains several heat pipes 4, and each of the heat pipes 4 in the heat pipe is 3 three in the smoking 1, the insulation layer 3 and the heat source medium passage 2. Horizontal space, the heat pipe 4 perpendicular to...

Embodiment 2

[0030] The heat pipe type SCR denitration reactor of this embodiment differs from Example 1 only in the construct of the denitrifination catalyst layer. The base body of the decision catalyst layer 5 of the present embodiment is a hollow tube having a thickness of 1 to 10 mm porous ceramic, and the catalyst passes through vacuum. The impregnated or coated manner is loaded on the porous ceramic substrate, and the catalyst layer 5 is formed to form a porous structure after drying and calcining, and the denitrifination catalyst layer 5 is nestled on the heat pipe condensation section. Other structures of the heat pipe type SCR denitrifact reactor of the present embodiment are the same as in Example 1, and will not be described herein.

[0031] In other embodiments of the invention, the connection between the heat pipe 4 and the upper wall surface of the flue 1 and the upper wall surface of the heat source dielectric channel 2 may have a plurality of sealing connections in the form of...

specific Embodiment

[0035] Specific embodiments of the low temperature sulfur flue gas denitration method of the present invention, such as:

[0036] A specific embodiment of the heat pipe type SCR denitrifact reactor of the present invention is used for a low temperature sulfur flue gas denitrifting method, which includes the following steps: (1) containing NO x Low-temperature smoke (usually less than 250 ° C) flows from the upper flue 1, when the low-temperature smoke gas flows through the denitrification catalyst layer 5, the NO is completed under the action of the catalyst. x Selective catalytic reduction removal; (2) At the same time, the heat source medium flows from the heat source dielectric channel 2, and the temperature of the heat source medium is higher than the flue gas temperature in the flue, and the heat source medium temperature reaches the sulfur temperature of the denitrifination in the catalyst layer 5; (3) The evaporation section of the heat pipe 4 absorbs the heat of the heat s...

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Abstract

The invention relates to a heat pipe type SCR denitration reactor and a low-temperature sulfur-containing flue gas denitration method thereof. A flue and a heat source medium channel which are horizontally arranged up and down are arranged in a reactor body, a heat insulation layer is arranged between the flue and the heat source medium channel, a heat pipe array is vertically arranged in the reactor body, the middle portions of heat pipes penetrate through the heat insulation layer, a condensation section and an evaporation section of the heat pipe are located in the flue and the heat source medium channel respectively, and a denitration catalyst layer of a porous structure is arranged outside the condensation section of the heat pipe. During operation, the temperature of a heat source medium needs to be higher than the temperature of flue gas, the requirement for the working temperature of the catalyst is met, the catalyst in the flue is maintained in a high-activity and high-sulfur-resistance temperature window by means of the characteristics of fast heat transfer and good axial temperature uniformity of the heat pipe, stable low-temperature flue gas denitration can be achieved even if a traditional medium-temperature SCR catalyst is adopted, high energy consumption of a conventional process for overall reheating of low-temperature flue gas is avoided, and in-situ continuous regeneration of the catalyst can be achieved by increasing the operation temperature of a heat source medium channel after the catalyst is inactivated at low temperature.

Description

Technical field [0001] The present invention relates to a heat pipe type SCR denitrifact reactor and its use in a low temperature sulfur-containing flue gas denitration method, belonging to the field of flue gas treatment. Background technique [0002] Nitrogen oxides are one of the main atmospheric pollutants, causing acid rain, photochemical smoke, etc., affecting environmental quality, harming human health. Therefore, governance of nitrogen oxides is the focus of atmospheric pollution control. With the comprehensive popularity, coking, steel sintering, ceramics and glass firing, cement manufacturing, etc., have become an important component of fixed source emissions, causing more and more attention. Catalysts used in conventional selective catalytic reduction (SCR) denitration can be operated for a long time in 300 ° C. For the above sects, since the flue gas temperature is generally less than 250 ° C, there is a certain catalyst toxic, and the conventional catalyst uses two m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56
CPCB01D53/8631B01D2258/0283B01D2255/20769B01D2255/20776B01D2255/20707B01D2255/20723B01D2255/2098
Inventor 朱林朱跃钊王啸远
Owner NANJING UNIV OF TECH
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