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Denitration device and denitration method

A technology of denitrification and denitrification rate, applied in the field of denitrification devices, can solve the problems of increased heating costs, increased operating costs, etc.

Inactive Publication Date: 2018-02-16
MITSUBISHI HITACHIPOWER SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In this ammonia catalytic reduction method, the cost of ammonia as a reducing agent and the heating cost for raising the temperature of exhaust gas increase
That is, in the ammonia catalytic reduction method, the running cost increases

Method used

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  • Denitration device and denitration method

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Experimental program
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no. 1 approach

[0107] refer to Figure 1 ~ Figure 3 A first embodiment of the denitration device of the present invention will be described.

[0108] Nitrogen oxides (hereinafter referred to as NOx), CO, and the like are contained in the exhaust gas treated by the denitration device of the present embodiment.

[0109] Such as figure 1 As shown, the denitration device 1 of the present embodiment includes a denitration reactor 10 , a heat exchanger 15 , a heater 20 and a thermometer 29 . The denitration reactor 10 reduces NOx contained in the exhaust gas EX. The heat exchanger 15 exchanges heat between the exhaust gas EX before flowing into the denitration reactor 10 , that is, the pre-denitration gas EXb, and the exhaust gas EX that flows out of the denitration reactor 10 , that is, the denitration completed gas EXa. The heater 20 heats the exhaust gas EX. The thermometer 29 detects the temperature of the exhaust gas EX.

[0110] A reaction container of the denitration reactor 10 is fill...

no. 4 approach

[0232] refer to Figure 12 and Figure 13A fourth embodiment of the denitration device of the present invention will be described.

[0233] Such as Figure 12 As shown, the denitration device 1c of the present embodiment is a modified example of the denitration device 1a of the second embodiment. The denitrification device 1c of this embodiment adds a bypass line 45, a bypass flow rate regulator 46, and a bypass waste heat recovery device 35c to the denitrification device 1a of the second embodiment, and omits the denitrification device 1a of the second embodiment. Waste heat recovery device 35.

[0234] The bypass line 45 connects the first denitrated gas line 43 and the second denitrated gas line 44 , and makes the denitrated gas EXa bypass the heat exchanger 15 .

[0235] The bypass flow rate regulator 46 includes a bypass valve 47 and a bypass controller 48 . The bypass valve 47 is provided in the bypass line 45 and adjusts the flow rate of the denitrated gas EXa flow...

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Abstract

A denitration device (1) is provided with a denitration reactor (10), a heat exchanger (15), and a heater (20). The denitration reactor (10) is filled with an Ir-containing catalyst (11) for reducingthe NOx contained in exhaust gas (EX). The heat exchanger (15) performs heat exchange between pre-denitration gas (EXb) flowing into the denitration reactor (10) and denitrated gas (EXa) flowing out of the denitration reactor (10), cooling the denitrated gas (EXa) and heating the pre-denitration gas (EXb). The heater (20) heats the pre-denitration gas (EXb) after the same has passed through the heat exchanger (15), the heating amount being adjustable.

Description

technical field [0001] The invention relates to a denitration device and a denitration method for treating nitrogen oxides in waste gas. [0002] this application claims priority based on Japanese Patent Application No. 2015-126821 for which it applied to Japan on June 24, 2015, and uses the content here. Background technique [0003] When treating nitrogen oxides (hereinafter referred to as NOx) in exhaust gas, the NOx is usually reduced to form N 2 and H 2 O. As a method for reducing NOx, an ammonia catalytic reduction method is widely known. [0004] In this ammonia catalytic reduction method, the cost of ammonia as a reducing agent and the heating cost for raising the temperature of exhaust gas increase. That is, in the ammonia catalytic reduction method, the running cost increases. Therefore, the following Patent Document 1 proposes a method of reducing NOx by utilizing CO and HC in exhaust gas using a catalyst containing Ir. [0005] prior art literature [0006...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/90B01J23/46B01J23/652F27D17/00
CPCB01D53/86B01J23/652B01D53/90F27D17/00B01J23/468B01D53/8625B01J37/0225
Inventor 清泽正志增田具承矶部知昭东野耕次
Owner MITSUBISHI HITACHIPOWER SYST LTD
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